CN116330628A - Transverse drawing device for optical polyester film - Google Patents

Abstract

The utility model provides an optical polyester film transverse drawing device, which belongs to the technical field of equipment for producing polyester optical films, and comprises a fixed workbench and a polyester film, and further comprises: the lower heating mechanism can rotate to perform rotary jet heating on the lower side of the polyester film when the polyester film is transversely stretched, and can continuously suck heating jet when the lower heating mechanism rotates to perform jet heating, and the lower heating mechanism slightly cools and then sprays the heated jet to the clamped part of the polyester film. According to the utility model, in the stretching process, the first rotary spray pipe, the prismatic spray pipe and the second rotary spray pipe are used for carrying out rotary and cyclic heating on the polyester film, so that a heating blind area can be effectively avoided when the polyester film is heated before stretching, and the hot air flow sprayed out from each section of the first rotary spray pipe through the first spray hole is kept consistent through the change of the first spray hole and the driving impeller set ruler diameter, so that the integral uniform heating effect of the polyester film is realized.

Description

Transverse drawing device for optical polyester film

Technical Field

The utility model relates to the technical field of equipment for producing a polyester optical film, in particular to a transverse drawing device for an optical polyester film.

Background

In the production process of the polyester optical film, transverse stretching is an important link in the whole process, the transverse stretching is subjected to longitudinal stretching before the transverse stretching, molecules are oriented in the longitudinal direction, and the stretching temperature is the most important factor influencing the film performance, and directly influences the mechanical performance, the moldability and the thickness uniformity of the film. The film is usually stretched under the low temperature condition during transverse stretching, which is favorable for improving the mechanical property of the film and increasing the thermal shrinkage rate of the film, but the problems of film breakage and film detachment easily occur in low-temperature stretching, and the stress change relation from amorphous to high polymer at different temperatures can be seen that the yield strength of the sheet is reduced, the elongation at break is increased from small to large and then is reduced greatly along with the increase of the stretching temperature, the tolerance difference of the film occurs when the stretching temperature is increased, the haze of the crystalline film is increased, and the phenomenon of film stretching and film breakage seriously occurs. The distribution of the transversely stretched regions is also an important process condition, and the film orientation temperature of the preheating region and the stretching region must be uniform and stable, otherwise the thickness uniformity and the stretching continuity of the stretched film are affected.

The prior art publication No. CN215661828U discloses a polyester optical film horizontal stretching system, and is difficult to make the temperature uniformity that distributes of each region of stretching stable when current polyester optical film is horizontal stretching work, seriously influences the problem of stretching film's thickness homogeneity and tensile continuity, the scheme is proposed to the present, and it includes frame and amplitude modulation cylinder system, is provided with stretching system entry and stretching system export in the frame, and amplitude modulation cylinder system is two and symmetry setting in the outside of frame, and amplitude modulation cylinder system is close to stretching system entry position, and the leading wheel is two and install in the frame and be connected with corresponding amplitude modulation cylinder system, and stretching system entry left and right sides all is provided with the caterpillar. The utility model has the advantages of automatic control and the like, not only meets various requirements of the production line process on control, but also has stable operation, ensures the quality of products, and improves the working efficiency;

however, the prior art still has a certain limitation, when the prior art preheats and heats the polyester optical film, the clamped part of the polyester optical film is also heated simultaneously, so that the clamped part of the polyester optical film becomes soft under the action of thermal stress, and further, the edge part of the polyester optical film is easily deformed during stretching, the product quality after the whole stretching is influenced, and even deformation and loosening of the clamped part of the polyester optical film during stretching are easily caused during severe conditions, thereby not only causing product loss, but also seriously influencing the normal running of the stretching work.

How to invent an optical polyester film transverse pulling device to improve the problems becomes a problem to be solved urgently by the person skilled in the art.

Disclosure of Invention

In order to make up for the defects, the utility model provides an optical polyester film transverse pulling device, which aims to solve the problem that the clamped part of a polyester optical film cannot be isolated and protected in the prior art.

The utility model is realized in the following way:

the utility model provides an optical polyester film transverse drawing device, which comprises a fixed workbench and a polyester film, and further comprises:

the lower heating mechanism can rotate to perform rotary jet heating on the lower side of the polyester film when the polyester film is transversely stretched, and can continuously suck heating jet when the lower heating mechanism rotates to perform jet heating, and jet the heated jet to the clamped part of the polyester film after slightly cooling;

and the upper heating mechanism reduces the flow speed of the sprayed hot air through a driving blade arranged below the conical nozzle when the polyester film is stretched in the horizontal direction in a remembering way, and simultaneously rotates under the driving action of the hot air through the conical nozzle arranged at the bottom of the upper heating mechanism to continuously spray the rotating hot air towards the upper surface of the polyester film.

Preferably, the fixed workbench is symmetrically provided with two groups, the side wall of the fixed workbench is fixedly provided with a first driving cylinder and a second driving cylinder, a pneumatic telescopic shaft of the first driving cylinder is fixedly provided with a movable workbench, the bottom of the movable workbench is provided with a heat supply pipeline, the side wall of the movable workbench is fixedly provided with a plurality of groups of third driving cylinders through a fixed plate, and the second driving cylinders supply compressed gas to the inside of the third driving cylinders through hoses; the surface of the movable workbench is fixedly provided with a fixed clamping block and a fixed air injection table, the side wall of the movable workbench is fixedly provided with a sealed pneumatic cavity, the bottom limit seal of the sealed pneumatic cavity is movably sleeved with a seal driving sliding block, a reset spring is fixedly arranged between the seal driving sliding block and the inside of the sealed pneumatic cavity, and the side wall of the fixed air injection table is fixedly provided with a unidirectional nozzle facing the fixed clamping block;

the lower heating mechanism comprises a first rotating spray pipe, one end of the first rotating spray pipe is rotationally connected with the movable workbench through a bearing, a heat supply pipeline extends into the movable workbench and is communicated with the inner cavity of the first rotating spray pipe, a prismatic limiting chute is formed in the inner side wall of the first rotating spray pipe far away from one end of the movable workbench, a prismatic air ejector pipe is sleeved in a limiting sealing mode on the inner side wall of the prismatic limiting chute, a plurality of groups of uniformly distributed third air ejector holes are formed in the side wall of the prismatic air ejector pipe, a second rotating spray pipe is sleeved in a limiting sealing mode on the outer side wall of the prismatic air ejector pipe, a driving connecting rod is fixedly mounted on the axial lead of the first rotating spray pipe through a plurality of groups of fixing rods connected with the inner side wall of the first rotating spray pipe, a plurality of groups of uniformly distributed driving impeller groups are fixedly mounted on the outer side wall of the driving connecting rod, a plurality of groups of uniformly distributed first air ejector holes are fixedly mounted on the outer side wall of the first rotating spray pipe at positions corresponding to the sealing driving sliding blocks.

Preferably, the internal cavity of the first rotating spray pipe is a group of round table-shaped cavities with smaller diameters towards the second rotating spray pipe, the whole size of the driving impeller group towards the second rotating spray pipe is gradually reduced, and the first air spraying hole is gradually enlarged towards the second rotating spray pipe.

Preferably, the side wall of the second rotary spray pipe is provided with second air spraying holes which are uniformly designed, and the inner diameters of the second air spraying holes, the third air spraying holes and the first air spraying holes with the largest tail end ruler diameters are kept consistent.

Preferably, the inner cavity of the sealed pneumatic cavity is communicated with the inside of the one-way nozzle through a group of pipelines, the one-way nozzle and the inside of the sealed pneumatic cavity are both provided with one-way valves, the side wall of the sealed pneumatic cavity is provided with one-way valves which circulate from the outside of the sealed pneumatic cavity to the inside direction of the sealed pneumatic cavity, and the inside of the one-way nozzle is provided with one-way valves which circulate from the inside of the sealed pneumatic cavity to the outside direction of the one-way nozzle.

Preferably, the fixed jet stage is constructed entirely of a loose porous structure material.

Preferably, a plurality of groups of anti-skid pad strips are arranged at the top of the fixed clamping block and the bottom of the pneumatic telescopic sliding block at the bottom of the third driving cylinder.

Preferably, the upper heating mechanism comprises two groups of fixed pipes, the fixed pipes are symmetrically designed to be fixedly connected with fixed plates arranged on the side walls of the movable workbench which is symmetrically designed on two sides, the inner cavities of one group of fixed pipes are communicated with the inside of the heat supply pipeline, the adjacent parts of the two groups of fixed pipes are jointly limited and sealed to form a group of communicating spray pipes, the bottoms of the side walls of the communicating spray pipes are provided with a plurality of groups of uniformly distributed fourth air injection holes, the bottoms of the fixed pipes are fixedly communicated with a plurality of groups of fixed spray pipes, the bottoms of the fixed spray pipes are rotationally connected with connecting bearings, conical spray nozzles are fixedly arranged at the bottoms of the connecting bearings, and a plurality of groups of spray holes are formed in the bottoms of the conical spray nozzles.

Preferably, the inner side wall of the connecting bearing is connected with a group of transmission rotating shafts through a plurality of groups of fixing rods, and the outer side wall of the transmission rotating shafts is fixedly provided with driving blades.

Preferably, the conical nozzle is of a frustoconical design with a large bottom and a small top.

The beneficial effects of the utility model are as follows:

in the stretching process, the polyester film is circularly heated by rotating through the first rotating spray pipe, the prismatic spray pipe and the second rotating spray pipe, so that a heating blind area can be effectively avoided when the polyester film is heated before stretching, the hot air flow sprayed out of each section of the first rotating spray pipe through the first spray hole is kept consistent through the change of the first spray hole and the driving impeller set ruler diameter, the integral uniform heating effect of the polyester film is realized, the temperature change of the stretching part of the polyester film is kept consistent, the thermal shrinkage condition of the polyester film during stretching can be kept consistent, cracking and uneven stretching caused by the temperature difference of the polyester film in different areas are avoided, the uniformity of the stretching effect of an internal molecular chain structure during stretching of the polyester film can be improved, and the integral quality of the stretched polyester film is improved;

when the lower heating mechanism is used for rotationally heating the polyester film, the sealing driving sliding block is used for compressing and sealing gas in the pneumatic cavity, the heating gas sprayed out of the first rotating spray pipe is cooled and then cools the polyester film at the clamped part, so that the thermal stress of the clamped part of the polyester film is reduced, the clamped part of the polyester film is prevented from deforming and softening during stretching to cause the clamping between the fixed clamping block and the third driving cylinder, the stability of the clamped part at the edge of the polyester film during stretching can be ensured, and the stretching effect and the stretching efficiency of the whole stretching of the polyester film are improved;

through the design of the big top of toper nozzle bottom, make the toper nozzle when pivoted, inside steam is through the orifice along toper diffusion blowout, not only improved the injection region of steam, improve steam utilization efficiency, reduce steam injection velocity simultaneously, make the whole thermal uniformity and mildness that is heated of polyester film, the difference in temperature when reducing the polyester film heating, the thermal stress when making the polyester film tensile keeps unanimous, promote stretching effect, avoid the too big blowout of steam velocity of flow to lead to the polyester film to receive the regional center that the steam directly spouts to be heated seriously, local difference in temperature is too big when leading to the whole stretching of polyester film, receive the thermal stress effect different, and then appear the fracture phenomenon when leading to the polyester film to stretch.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of an optical polyester film transverse drawing device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the overall structure of a lower heating mechanism of a transverse drawing device for an optical polyester film according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of the overall structure of a heating mechanism on a transverse drawing device for an optical polyester film according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 3 according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing a state of the transverse drawing device for the optical polyester film when clamping the polyester film according to the embodiment of the utility model;

FIG. 6 is a schematic view showing a state of an optical polyester film transverse drawing device for drawing a polyester film according to an embodiment of the present utility model;

FIG. 7 is a schematic view showing a state in which an optical polyester film transverse drawing device according to an embodiment of the present utility model cools a clamped portion of a polyester film through a unidirectional nozzle;

fig. 8 is an enlarged schematic view of fig. 7 at B in accordance with an embodiment of the present utility model.

In the figure: 1. a fixed workbench; 2. a movable working table; 3. a lower heating mechanism; 4. an upper heating mechanism; 5. a polyester film; 11. a first drive cylinder; 12. a second drive cylinder; 21. a third driving cylinder; 22. a heat supply pipe; 23. fixing the clamping blocks; 24. sealing the pneumatic cavity; 25. sealing and driving the sliding block; 26. a return spring; 27. fixing an air injection table; 28. a unidirectional nozzle; 31. a first rotary nozzle; 32. a second rotary nozzle; 33. a drive link; 34. driving the impeller set; 35. a first gas injection hole; 36. prismatic limit sliding groove; 37. prismatic gas-jet tube; 38. arc-shaped protruding blocks; 41. a fixed tube; 42. fixing the spray pipe; 43. a communicating spray pipe; 44. connecting a bearing; 45. a conical nozzle; 46. a spray hole; 47. a transmission rotating shaft; 48. a driving blade; 321. a second gas injection hole; 371. a third gas injection hole; 431. and a fourth gas injection hole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Examples

Referring to fig. 1 to 8, an optical polyester film transverse drawing device comprises a fixed table 1, apolyester film 5, and further comprises:

thelower heating mechanism 3 can rotate to perform rotary jet heating on the lower side of thepolyester film 5 when thepolyester film 5 is transversely stretched, and can continuously suck heating jet while thelower heating mechanism 3 rotates to perform jet heating, and jet the heated jet to the clamped part of thepolyester film 5 after slightly cooling;

the upper heating mechanism 4 reduces the flow rate of the hot air ejected by thedriving blade 48 arranged below theconical nozzle 45 when stretching thepolyester film 5 in the horizontal direction, and simultaneously continuously ejects the rotating hot air toward the upper surface of thepolyester film 5 by the rotation of theconical nozzle 45 arranged at the bottom of the upper heating mechanism 4 under the driving action of the hot air.

Referring to fig. 1-2, two groups of fixed tables 1 are symmetrically arranged, afirst driving cylinder 11 and asecond driving cylinder 12 are fixedly arranged on the side wall of the fixed table 1, a movable table 2 is fixedly arranged on a pneumatic telescopic shaft of thefirst driving cylinder 11, aheating pipeline 22 is arranged at the bottom of the movable table 2, a plurality of groups ofthird driving cylinders 21 are fixedly arranged on the side wall of the movable table 2 through a fixed plate, and compressed gas is supplied to the inside of thethird driving cylinders 21 through hoses by thesecond driving cylinders 12; the surface of themovable workbench 2 is fixedly provided with a fixedclamping block 23 and a fixed air injection table 27, the side wall of themovable workbench 2 is fixedly provided with a sealedpneumatic cavity 24, the bottom limit seal of the sealedpneumatic cavity 24 is movably sleeved with a sealdriving sliding block 25, areset spring 26 is fixedly arranged between the seal driving slidingblock 25 and the inside of the sealedpneumatic cavity 24, and the side wall of the fixed air injection table 27 is fixedly provided with aunidirectional nozzle 28 facing the fixedclamping block 23;

the lower heating mechanism 3 comprises a first rotating spray pipe 31, one end of the first rotating spray pipe 31 is rotationally connected with the movable workbench 2 through a bearing, a heat supply pipeline 22 extends into the movable workbench 2 and is communicated with an inner cavity of the first rotating spray pipe 31, a prismatic limiting chute 36 is formed in the inner side wall of one end of the first rotating spray pipe 31 far away from the movable workbench 2, a prismatic air ejector 37 is movably sleeved on the inner side wall of the prismatic limiting chute 36 in a limiting sealing mode, a plurality of groups of uniformly distributed third air ejector holes 371 are formed in the side wall of the prismatic air ejector 37, a second rotating spray pipe 32 is movably sleeved on the outer side wall of the prismatic air ejector 37 in a limiting sealing mode, a driving connecting rod 33 is fixedly mounted on the axis of the first rotating spray pipe 31 through a plurality of groups of fixed rods connected with the inner side wall of the first rotating spray pipe 31, a plurality of groups of uniformly distributed driving impeller groups 34 are fixedly mounted on the outer side wall of the driving connecting rod 33, a plurality of groups of uniformly distributed first air ejector holes 35 are formed in the outer side wall of the first rotating spray pipe 31, and a group of arc-shaped protruding blocks 38 are fixedly mounted at positions corresponding to the sealing driving sliding blocks 25.

Further, the internal cavity of the firstrotating nozzle 31 is a group of truncated cone-shaped cavities with smaller diameters towards the secondrotating nozzle 32, the overall size of the drivingimpeller group 34 towards the secondrotating nozzle 32 is gradually reduced, and the size of the firstair injection hole 35 towards the secondrotating nozzle 32 is gradually increased;

it should be noted that, when the hot air enters the firstrotating nozzle 31 through theheat supply pipeline 22, the pressure is larger, so that the driving impeller set 34 with larger size can be efficiently driven, meanwhile, after the hot air passes through the first driving impeller set 34, the pressure is smaller, the driving impeller set 34 with smaller subsequent size can be continuously driven, and thedriving connecting rod 33 can be driven to further drive the firstrotating nozzle 31 to keep high-efficiency rotation through step-by-step driving of the driving impeller set 34;

meanwhile, when the hot air just enters the firstrotating spray pipe 31, the pressure is smaller, the caliber of the firstair injection hole 35 is smaller at the moment, the flow rate of hot air injection can be reduced, the flow rate and the pressure become smaller along with the rotation of the hot air driving impeller set 34, the caliber of the firstair injection hole 35 becomes larger at the moment, the flow rate of the hot air becomes slower, the flow rate of the hot air sprayed out of the firstair injection hole 35 can be kept consistent with the flow rate of the hot air sprayed out of the firstair injection hole 35 with the smaller caliber and the larger pressure at the front, and the flow rate of the hot air sprayed out of each section of the firstrotating spray pipe 31 through the firstair injection hole 35 can be kept consistent as a whole, so that the whole uniform heating effect on thepolyester film 5 is realized.

Further, the side wall of the secondrotary spray pipe 32 is provided with second air injection holes 321 which are uniformly designed, and the inner diameters of the second air injection holes 321, the third air injection holes 371 and the first air injection holes 35 with the largest tail end ruler diameter are kept consistent;

after the hot air enters theprismatic air ejector 37 and the secondrotating ejector 32, the inner diameters of theprismatic air ejector 37 and the secondrotating ejector 32 are kept unchanged, the hot air is not disturbed by the driving impeller set 34 and the speed-down effect, so that the heat air flow and the flow velocity ejected through thethird air ejector 371 and thesecond air ejector 321 are nearly consistent, the efficiency of heating the lower part of thepolyester film 5 while the firstrotating ejector 31, theprismatic air ejector 37 and the secondrotating ejector 32 rotate can be realized to be consistent, the temperature change of the stretching part of thepolyester film 5 is kept consistent, the thermal shrinkage condition of thepolyester film 5 is kept consistent during stretching, the cracking and the uneven stretching caused by the temperature difference of thepolyester film 5 in different areas are avoided, the uniformity of the stretching effect of the internal molecular chain structure during stretching of thepolyester film 5 is improved, and the integral quality of the stretchedpolyester film 5 is improved.

The inner cavity of the sealedpneumatic cavity 24 is communicated with the inside of theunidirectional nozzle 28 through a group of pipelines, theunidirectional nozzle 28 and the inside of the sealedpneumatic cavity 24 are both provided with unidirectional valves, the side wall of the sealedpneumatic cavity 24 is provided with a unidirectional valve which flows from the outside of the sealedpneumatic cavity 24 to the inside of the sealedpneumatic cavity 24, and the inside of theunidirectional nozzle 28 is provided with a unidirectional valve which flows from the inside of the sealedpneumatic cavity 24 to the outside of theunidirectional nozzle 28;

specifically, when the arc-shaped protruding block 38 rotates to push the seal driving sliding block 25 to rise to compress the reset spring 26, the movement of the seal driving sliding block 25 can compress the gas in the seal pneumatic cavity 24, so that the gas in the seal pneumatic cavity 24 is blown from the unidirectional nozzle 28 towards the clamped part of the polyester film 5 between the fixed clamping block 23 and the third driving cylinder 21 through the pipeline, the hot gas sucked by the seal pneumatic cavity 24 and sprayed out through the first rotating spraying pipe 31 can ensure the stability of stretching and the whole stretching stability of the edge of the polyester film 5 when the polyester film 5 is stretched by the stretching and the stretching stability of the edge of the polyester film 5 when the polyester film 5 is stretched by the deformation and softening to be separated from the clamping between the fixed clamping block 23 and the third driving cylinder 21 through the cooling effect when the unidirectional nozzle 28 sprays out, the temperature is slightly lower than that of the temperature of the gas sprayed out by the first rotating spraying pipe 31 and the spraying hole 46, the temperature difference between the polyester film 5 and the clamped part of the heated stretching part can be avoided, and the thermal stress of the clamped part of the polyester film 5 can be reduced, and the thermal stress of the clamped part of the polyester film 5 can be prevented when the clamped part is stretched, and the whole stretching efficiency of the polyester film 5 can be improved when the edge of the polyester film is stretched and stretched.

Further, the wholefixed jet platform 27 is constructed by loose porous structure materials;

by means of the porous structure design of the fixed air injection table 27, when hot air is injected from the inner pipeline of the fixed air injection table 27 through theunidirectional nozzle 28, a certain heat dissipation and cooling effect can be achieved on the hot air flowing in the pipeline.

Further, a plurality of groups of anti-skid pad strips are arranged at the top of the fixedclamping block 23 and at the bottom of the pneumatic telescopic sliding block at the bottom of thethird driving cylinder 21;

it should be noted that, by the anti-slip backing strip, not only the stress and friction force when in contact with themylar 5 can be improved, themylar 5 is prevented from sliding, but also themylar 5 can be buffered when clamped, and the clamping portion is protected.

Referring to fig. 3-4, the upper heating mechanism 4 includes two groups of fixedpipes 41, the fixedpipes 41 are symmetrically designed with two groups of fixed plates respectively and fixedly connected with the side walls of themovable worktable 2 which are symmetrically designed on two sides, wherein the inner cavity of one group of fixedpipes 41 is communicated with the interior of theheat supply pipeline 22, the adjacent parts of the two groups of fixedpipes 41 are jointly limited and movably sleeved with a group of communicatingspray pipes 43, the bottoms of the side walls of the communicatingspray pipes 43 are provided with a plurality of groups of uniformly distributed fourth air injection holes 431, the bottoms of the fixedpipes 41 are fixedly communicated with a plurality of groups of fixedspray pipes 42, the bottoms of the fixedspray pipes 42 are rotationally connected with connectingbearings 44, the bottoms of the connectingbearings 44 are fixedly provided withconical spray pipes 45, and the bottoms of theconical spray pipes 45 are provided with a plurality of groups of spray holes 46.

Further, the inner side wall of the connectingbearing 44 is connected with a group oftransmission rotating shafts 47 through a plurality of groups of fixing rods, and the outer side wall of thetransmission rotating shafts 47 is fixedly provided with drivingblades 48.

Further, theconical nozzle 45 is designed in a truncated cone shape with a large bottom and a small top;

it should be noted that, when the inside hot air of heating pipeline 22 gets into the inside of fixed pipe 41, the inside of hot air can further get into fixed spray tube 42 and toper nozzle 45, the hot air can drive vane 48 and rotate when passing through, further drive the whole rotation of toper nozzle 45 through drive vane 48, simultaneously the hot air can play the effect of choking to the hot air through drive vane 48, reduce hot air flow rate, simultaneously cooperate the rotation of toper nozzle 45, and the toper design of toper nozzle 45 big top, make the inside hot air diffuse blowout along the toper through orifice 46 when rotating, not only improve the injection area of hot air, improve hot air utilization efficiency, simultaneously reduce hot air injection velocity, make the whole thermal stress of polyester film 5 more even mild when reducing the polyester film 5 and heat the difference in temperature, the thermal stress when making polyester film 5 tensile keeps unanimous, promote stretching effect, avoid the too big blowout of hot air velocity to receive the regional center of hot air directly spouting, the regional difference in temperature when leading to the whole thermal stress effect of toper nozzle 45 is too big, and then receive the thermal stress effect difference when receiving the polyester film 5 to break when stretching, and then appear the phenomenon when stretching polyester film 5.

The working principle of the transverse drawing device of the optical polyester film is as follows:

firstly, placing two sides of a polyester film 5 to be stretched between a fixed clamping block 23 and a third driving cylinder 21, then starting a second driving cylinder 12 and the third driving cylinder 21, driving the third driving cylinder 21 to extend out of a pneumatic telescopic block at the bottom of the third driving cylinder 21 to be tightly abutted against the fixed clamping block 23 through the second driving cylinder 12, clamping the polyester film 5 between the fixed clamping block 23 and the third driving cylinder 21, and then introducing hot air into a first rotating spray pipe 31 and a fixed pipe 41 through a heat supply pipeline 22, wherein when the hot air enters the first rotating spray pipe 31 through the heat supply pipeline 22, the pressure is high, so that a driving impeller set 34 with a large size can be efficiently driven, meanwhile, after the hot air passes through the first driving impeller set 34, the pressure is reduced, the driving impeller set 34 with a small subsequent size can be continuously driven, and the driving connecting rod 33 can be driven to further drive the first rotating spray pipe 31 to keep high-efficient rotation through step-by step driving of the driving impeller set 34; meanwhile, because the pressure is smaller when the hot air just enters the first rotating spray pipe 31, the caliber of the first air injection hole 35 is smaller at the moment, the flow rate of hot air injection can be reduced, then the caliber of the first air injection hole 35 is larger at the moment and the flow rate of the hot air is also slower along with the rotation of the hot air driving impeller set 34, the heat air flow rate sprayed from the first air injection hole 35 can be kept consistent with the heat air flow rate sprayed from the first air injection hole 35 with smaller front caliber and larger pressure, the whole can keep the heat air flow rate sprayed from each section of the first rotating spray pipe 31 through the first air injection hole 35 consistent, the whole uniform heating effect on the polyester film 5 is realized, and further, after the hot air enters the prismatic air injection pipe 37 and the second rotating spray pipe 32, the inner diameters of the prismatic air injection pipe 37 and the second rotating spray pipe 32 are kept unchanged, the hot air can not be disturbed by the turbulence and the speed reducing effect of the driving impeller group 34, the hot air flow and the flow speed sprayed out through the third air jet hole 371 and the second air jet hole 321 can be enabled to be approximately consistent, the efficiency of heating the lower part of the polyester film 5 when the first rotary jet pipe 31, the prismatic air jet pipe 37 and the second rotary jet pipe 32 rotate can be enabled to be approximately consistent, the lower heating mechanism 3 is matched with the whole polyester film 5 to circularly heat the polyester film 5 in a rotating way, the heating blind area can be effectively avoided when the polyester film 5 is heated before stretching, meanwhile, the temperature change of the stretching part of the polyester film 5 is kept consistent by reducing the heating heat loss in a closing way, the thermal shrinkage condition of the polyester film 5 is kept consistent when stretching, the cracking and uneven stretching of the polyester film 5 in different areas caused by the temperature difference of the polyester film 5 are avoided, further, the uniformity of the stretching effect of the internal molecular chain structure during stretching of the polyester film 5 can be improved, and the overall quality of the stretched polyester film 5 can be improved;

when the lower heating mechanism 3 rotates and the arc-shaped protruding block 38 rotates to push the sealing driving sliding block 25 to rise and compress the reset spring 26, the movement of the sealing driving sliding block 25 can compress the gas in the sealing pneumatic cavity 24, so that the gas in the sealing pneumatic cavity 24 is blown from the one-way nozzle 28 towards the clamped part of the polyester film 5 between the fixed clamping block 23 and the third driving cylinder 21 through the pipeline, the hot gas sucked by the sealing pneumatic cavity 24 and sprayed out through the first rotating spray pipe 31 can ensure that the polyester film 5 is separated from the clamping part between the fixed clamping block 23 and the third driving cylinder 21 due to deformation and softening during stretching by the cooling effect when flowing in the movable workbench 2 and the fixed spray pipe 27 and the one-way nozzle 28, the temperature is slightly lower than that of the gas sprayed out through the first rotating spray pipe 31 and the spray hole 46 when being sprayed out through the one-way nozzle 28, the temperature difference between the polyester film 5 at the clamped part and the heated stretched part is overlarge, the clamped part of the polyester film 5 can be prevented from being cooled, the thermal stress of the clamped part of the polyester film 5 is reduced, the thermal stress of the clamped part of the polyester film 5 is prevented from being deformed and softened, the clamping effect between the fixed clamping block 23 and the third driving cylinder 21 is avoided, and the whole stretching effect of the polyester film can be ensured, and the stretching stability of the edge can be improved when stretching the polyester film is stretched, and the whole efficiency is improved;

further, when the hot air in the heat supply pipeline 22 enters the fixed pipe 41, the hot air further enters the fixed spray pipe 42 and the conical nozzle 45, the hot air can drive the driving blades 48 to rotate when passing through, the driving shafts 47 further drive the conical nozzle 45 to integrally rotate, meanwhile, when the hot air passes through the driving blades 48, the hot air can have a flow blocking effect on the hot air, the flow speed of the hot air is reduced, and simultaneously, the rotating of the conical nozzle 45 is matched with the conical design that the bottom of the conical nozzle 45 is large and the top is small, so that the hot air in the conical nozzle 45 is sprayed out along the conical diffusion through the spray holes 46 when rotating, the spray area of the hot air is improved, the utilization efficiency of the hot air is improved, the spray speed of the hot air is reduced, the whole heating of the polyester film 5 is more uniform and mild, the temperature difference when the polyester film 5 is heated is reduced, the thermal stress when the polyester film 5 is stretched is kept consistent, the stretching effect is improved, and the phenomenon that the polyester film 5 is broken when the whole stretching is caused by the local temperature difference when the hot air is sprayed out excessively is heated is avoided;

referring to fig. 5 to 6, in the stretching process, thefirst driving cylinders 11 at both sides are simultaneously started, the movable table 2 is driven by the pneumatic telescopic rod of thefirst driving cylinder 11 to slowly shrink towards the direction of thefirst driving cylinder 11, so that thepolyester film 5 can be stretched, in the process, when the firstrotating spray pipe 31 and the secondrotating spray pipe 32 are far away from each other, theprismatic spray pipe 37 can be exposed, thepolyester film 5 is continuously heated through thethird spray hole 371, and when the fixedpipes 41 are far away from each other, thefourth spray hole 431 communicated with the bottom of thespray pipe 43 can also continuously heat thepolyester film 5, so that a heating dead zone is avoided.

It should be noted that, the specific model specification of the cylinder needs to be determined by selecting the model according to the actual specification of the device, and the specific model selecting calculation method adopts the prior art in the field, so detailed description is omitted.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An optical polyester film transverse drawing device comprises a fixed workbench (1) and a polyester film (5), and is characterized by further comprising:

the lower heating mechanism (3) can rotate to perform rotary jet heating on the lower side of the polyester film (5) when the polyester film (5) is transversely stretched, and can continuously suck heating jet when the lower heating mechanism (3) rotates to perform jet heating, and the heating jet is slightly cooled and then is sprayed to the clamped part of the polyester film (5);

the upper heating mechanism (4) reduces the flow speed of the ejected hot air through a driving blade (48) arranged below the conical nozzle (45) when the polyester film (5) is stretched in a memory transverse direction, and simultaneously continuously ejects the rotating hot air towards the upper surface of the polyester film (5) through the conical nozzle (45) arranged at the bottom of the upper heating mechanism (4) under the driving action of the hot air.

2. The transverse drawing device for the optical polyester film according to claim 1, wherein two groups of the fixed working tables (1) are symmetrically arranged, a first driving cylinder (11) and a second driving cylinder (12) are fixedly arranged on the side wall of each fixed working table (1), a movable working table (2) is fixedly arranged on a pneumatic telescopic shaft of each first driving cylinder (11), a heat supply pipeline (22) is arranged at the bottom of each movable working table (2), a plurality of groups of third driving cylinders (21) are fixedly arranged on the side wall of each movable working table (2) through a fixed plate, and compressed gas is supplied to the inside of each third driving cylinder (21) through a hose by each second driving cylinder (12); the surface of the movable workbench (2) is fixedly provided with a fixed clamping block (23) and a fixed air injection table (27), the side wall of the movable workbench (2) is fixedly provided with a sealed pneumatic cavity (24), the bottom limit seal of the sealed pneumatic cavity (24) is movably sleeved with a seal driving sliding block (25), a reset spring (26) is fixedly arranged between the seal driving sliding block (25) and the inside of the sealed pneumatic cavity (24), and the side wall of the fixed air injection table (27) is fixedly provided with a unidirectional nozzle (28) facing the fixed clamping block (23);

the lower heating mechanism (3) comprises a first rotating spray pipe (31), one end of the first rotating spray pipe (31) is rotationally connected with a movable workbench (2) through a bearing, a heating pipeline (22) extends into the movable workbench (2) and is communicated with an inner cavity of the first rotating spray pipe (31), a prismatic limiting sliding groove (36) is formed in the inner side wall of one end of the first rotating spray pipe (31) far away from the movable workbench (2), a prismatic spray pipe (37) is movably sleeved on the inner side wall limiting sealing of the prismatic limiting sliding groove (36), a plurality of groups of uniformly distributed third spray holes (371) are formed in the side wall of the prismatic spray pipe (37), a second rotating spray pipe (32) is movably sleeved on the outer side wall limiting sealing of the prismatic spray pipe (37), a driving connecting rod (33) is fixedly mounted on the shaft axis of the first rotating spray pipe (31) through a plurality of groups of fixing rods connected with the inner side wall of the first rotating spray pipe (31), driving impeller sets (34) are fixedly mounted on the outer side walls of the driving connecting rod (33), and a plurality of groups of uniformly distributed driving impeller sets (35) are mounted on the outer side walls of the first rotating spray pipe (31) and correspond to the corresponding first rotating spray pipe sets (25).

3. The transverse drawing device for the optical polyester film according to claim 2, wherein the internal cavity of the first rotating spray pipe (31) is a group of truncated cone-shaped cavities with smaller diameters towards the second rotating spray pipe (32), the whole size of the driving impeller group (34) is gradually reduced towards the second rotating spray pipe (32), and the size of the first air injection hole (35) is gradually increased towards the second rotating spray pipe (32).

4. An optical polyester film transverse pulling device according to claim 3, wherein the side wall of the second rotary spray pipe (32) is provided with second air holes (321) which are uniformly designed, and the inner diameters of the second air holes (321), the third air holes (371) and the first air holes (35) with the largest tail end ruler diameter are kept consistent.

5. The transverse drawing device for the optical polyester film according to claim 2, wherein the inner cavity of the sealed pneumatic cavity (24) is communicated with the inside of the unidirectional nozzle (28) through a group of pipelines, the unidirectional nozzle (28) and the inside of the sealed pneumatic cavity (24) are both provided with one-way valves, the side wall of the sealed pneumatic cavity (24) is provided with one-way valves which circulate from the outside of the sealed pneumatic cavity (24) to the inside of the sealed pneumatic cavity (24), and the inside of the unidirectional nozzle (28) is provided with one-way valves which circulate from the inside of the sealed pneumatic cavity (24) to the outside of the unidirectional nozzle (28).

6. An optical polyester film transverse drawing device according to claim 2, wherein the fixed air-jet table (27) is integrally constructed of a loose porous structure material.

7. The transverse drawing device for the optical polyester film according to claim 2, wherein a plurality of groups of anti-slip cushion strips are arranged at the top of the fixed clamping block (23) and at the bottom of the pneumatic telescopic sliding block at the bottom of the third driving cylinder (21).

8. The transverse drawing device for the optical polyester film according to claim 2, wherein the upper heating mechanism (4) comprises two fixed pipes (41), the two fixed pipes (41) are symmetrically designed, the two fixed pipes are fixedly connected with fixed plates arranged on the side walls of the movable workbench (2) which are symmetrically designed on two sides respectively, an inner cavity of one fixed pipe (41) is communicated with the inside of the heat supply pipeline (22), two groups of the fixed pipes (41) are mutually close to each other, a group of communicating spray pipes (43) are movably sleeved in a limiting and sealing mode, a plurality of groups of fourth spray holes (431) which are uniformly distributed are formed in the bottoms of the side walls of the communicating spray pipes (43), a plurality of groups of fixed spray pipes (42) are fixedly communicated with each other, a connecting bearing (44) is rotatably connected to the bottoms of the fixed spray pipes (42), a conical spray nozzle (45) is fixedly arranged at the bottoms of the connecting bearing (44), and a plurality of groups of spray holes (46) are formed in the bottoms of the conical spray nozzle (45).

9. The transverse drawing device for the optical polyester film according to claim 8, wherein the inner side wall of the connecting bearing (44) is connected with a group of transmission rotating shafts (47) through a plurality of groups of fixing rods, and driving blades (48) are fixedly arranged on the outer side wall of the transmission rotating shafts (47).

10. An optical polyester film transverse drawing device according to claim 8, wherein the conical nozzle (45) is of a truncated cone shape with a large bottom and a small top.

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