Circulation powder shaking deviceTechnical Field
The invention relates to the technical field of powder shaking machines, in particular to a circulating powder shaking device.
Background
Powder shaking machines are commonly used in the field of thermal transfer printing; taking a white ink hot-stamping process as an example, the process flow of the white film hot-stamping comprises pattern printing, powder shaking and drying, pressing and manufacturing a finished product; the powder shaking machine is used for carrying out the powder shaking and drying process, and hot melt adhesive powder needs to be scattered, excessive hot melt adhesive powder is shaken off, and patterns are heated and dried; therefore, the hot melt adhesive powder in the powder shaking machine has two dynamic states, and the hot melt adhesive powder is scattered on the PET film and is shaken off from the PET film; the PET film is also named as a high-temperature-resistant polyester film, and is a hot melt adhesive powder carrier commonly used in industrial thermal transfer printing; when the hot melt adhesive powder is spread on the PET film, a sufficient amount is required; the residual heat melt powder is shaken off from the PET film; this also represents a significant consumption of hot melt adhesive powder by the powder shaker; in order to reduce the consumption of the hot melt adhesive powder in the prior art, a recycling measure is generally set to recycle the shaken-off hot melt powder; some powder shaking machines are used for lowering the container below to recover the redundant hot melt powder; some powder shaking machines are provided with circulating devices to recycle the redundant hot melt powder; the powder shaking machine recovered by the container needs to be specially arranged for workers to replace the recovery container; the powder shaking machine recovered by the circulating device can automatically recover redundant hot melt powder and reuse the hot melt powder, but does not pay attention to how the hot melt powder can be collected as much as possible to improve the recovery utilization rate, and how to uniformly and repeatedly spread the hot melt powder after collection to ensure the full contact of the hot melt powder and the PET film so as to ensure the heat transfer effect.
Disclosure of Invention
The invention aims to solve the problems and provides a circulating powder shaking device.
The technical scheme of the invention is as follows: a circulating powder shaking device comprises a powder storage area, a powder distribution area, a powder shaking area and a recovery assembly; the powder storage area is positioned at the front upper position of the powder distribution area; the powder shaking area is behind the powder distribution area; the PET film entering the circulating powder shaking device passes through the lower part of the powder storage area, and then sequentially enters the powder distribution area and the powder shaking area;
The recovery assembly comprises a transverse recovery mechanism, a vertical recovery mechanism and a temporary storage box; the transverse recovery mechanism is transversely arranged below the powder distribution area; the temporary storage box is arranged at one end of the transverse recovery mechanism and is communicated with the transverse recovery mechanism; the lower part of the vertical recovery mechanism vertically penetrates through the temporary storage box and is connected with the bottom of the temporary storage box, and the upper part of the vertical recovery mechanism is communicated with the powder storage area;
The transverse recovery mechanism comprises a driving belt pulley, a driven belt pulley, a scraper belt and a transverse motor; the driving belt wheel is coaxially and fixedly connected with the output end of the transverse motor; the scraper belt is connected with the driving belt pulley and the driven belt pulley; a plurality of scrapers are uniformly distributed on the outer side surface of the scraper belt; the scraping plate is made of elastic material the outer side surface of the scraper belt is vertical;
The vertical recovery mechanism comprises a vertical outer cover pipe, a spiral lifting rod and a lifting motor; the outer cover pipe is inserted into the temporary storage box, the bottom is provided with a lifting inlet, and the top is provided with a lifting outlet communicated with the powder storage area; the spiral lifting rod is inserted into the outer cover tube, the bottom end is rotationally connected with the temporary storage box, the top end is connected with the output end of the lifting motor in a transmission way, the side surface of the middle part is matched with the inner wall of the outer cover pipe;
The powder storage area comprises a powder storage box, a spiral powder spreading rod and a powder spreading motor; the bottom of the powder storage box comprises a powder discharging surface in the middle, a powder returning surface close to the inner side and a vibrating surface close to the outer side; the powder returning surface and the vibration surface are inclined respectively; the middle part of the powder discharging surface is provided with a powder discharging port; the lower end face of the powder discharge port is covered with a layer of powder homogenizing net; two sides of the powder homogenizing net are clamped with the powder discharging surface through two transverse clamping plates; each transverse splint is L-shaped; longitudinal adjusting long holes are uniformly distributed on the transverse clamping plates; the bolt penetrates through the powder discharging surface from top to bottom the long hole is adjusted and then is connected with the nut through threads; a plurality of direct vibrators are uniformly distributed and connected below the vibration surface; one end of the powder return surface is connected with the powder return surface the side wall of the powder storage box is communicated with the lifting outlet; the spiral powder spreading rod transversely penetrates through the powder storage box above the powder return surface and is matched with the powder return surface, one end of the spiral powder spreading rod is rotationally connected with the side wall of the powder storage box, and the other end of the spiral powder spreading rod is in transmission connection with the powder spreading motor;
The powder distribution area is provided with a transverse powder feeding rod; the powder feeding rod is positioned above the PET film, and end covers are fixedly connected at both ends of the powder feeding rod; the end cover is provided with a step which is matched with the edge of the PET film inwards; the distance between the two steps is matched with the width of the PET film;
The powder shaking area is provided with a transverse powder shaking piece; the powder shaking piece is arranged below the PET film, and a plurality of powder beating rods are circumferentially distributed on the powder shaking piece; the circumferential position of the powdering rod is matched with the PET film transfer route; the end part of the powder shaking piece is in transmission connection with a powder shaking motor.
Preferably, the scraper belt enters the interior of the temporary storage box.
Preferably, the top end of the spiral lifting rod is in belt transmission connection with the lifting motor.
Preferably, the temporary storage box is provided with a transverse inlet corresponding to the transverse recovery mechanism and a sliding inclined plane below the transverse inlet; the lifting inlet corresponds to the sliding inclined plane.
Preferably, the spiral powder spreading rod is connected with the powder spreading motor through belt transmission.
Preferably, a powder sliding plate corresponding to the powder discharging port and the powder distributing area is arranged below the powder discharging port.
Preferably, the powder shaking piece is connected with the powder shaking motor through a belt transmission.
Preferably, the circulating powder shaking device is also provided with a downward V-shaped shell; the upper part of the V-shaped shell wraps the powder distribution area and the powder shaking area, and the bottom end is provided with a transverse recovery mechanism.
Preferably, the side wall of the bottom end of the V-shaped shell is provided with a transverse long hole, a vertical tensioning plate and a tensioning screw at the position corresponding to the driven belt wheel; the driven belt wheel is rotationally connected with a mounting shaft; the mounting shaft penetrates through the transverse long hole; the tensioning screw penetrates through the vertical tensioning plate and is in threaded connection with the end part of the mounting shaft.
Preferably, an entering inclined plane connected with the powder return plane is arranged below the lifting outlet.
The beneficial effects of the invention are as follows: the invention relates to a circulating powder shaking device which comprises a powder storage area, a powder distribution area, a powder shaking area and a recovery assembly; the bottom of the powder storage area is provided with a powder returning surface and a vibration surface which incline towards the powder discharge port; a powder equalizing net and a transverse clamping plate are arranged below the powder discharging port; the powder homogenizing net uniformly outputs the hot melt adhesive powder; the position of the transverse clamping plate can adjust the output range of the hot melt adhesive powder; the powder distribution area is provided with independent powder feeding rods, so that the PET film naturally sags; repeatedly covering the sagging part of the PET film in the part of the hot melt adhesive powder discharged from the powder storage area, and prolonging the action time of the hot melt adhesive powder; the powder shaking area is provided with a powder shaking piece, and the PET film is continuously hit, so that excessive hot melt adhesive powder is shaken off; the hot melt adhesive powder falling from the powder distribution area and the powder shaking area is recovered by a recovery assembly at the bottom end and sent to a powder storage area for reuse, and the powder is uniformly discharged; wherein the scraper made of elastic materials fully recovers the hot melt adhesive powder, and the spiral lifting rod lifts the hot melt adhesive powder into the powder storage box; the spiral powder spreading rod of the powder storage box enables the recovered hot melt adhesive powder to be uniformly dispersed and finally discharged uniformly.
Drawings
FIG. 1 is a perspective view of a cyclic powder shaking device of the present invention;
FIG. 2 is a second perspective view of the circulating powder shaking device of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
Fig. 5 is an enlarged view of I of fig. 4;
fig. 6 is an enlarged view of II of fig. 4;
FIG. 7 is a perspective view of the transverse splint;
FIG. 8 is a cross-sectional view of C-C of FIG. 4;
FIG. 9 is a B-B cross-sectional view of FIG. 3;
FIG. 10 is a cross-sectional perspective view of the vertical recovery mechanism;
FIG. 11 is a perspective view of the powder stick;
fig. 12 is a perspective view of the powder shaking member;
In the figure: PET film, 1. Powder storage area, 11. Powder storage box, 111. Powder discharge face, 1111. Powder discharge mouth, 1112. Powder mesh, 1113. Transverse clamping plate, 11131. Adjustment slot, 112. Powder return face, 1121. Inlet ramp, 113. Vibration face, 1131. Direct vibrator, 114. Slip plate, 12. Spiral powder spreading rod, 13. Spreading motor, 2. Powder distribution area, 21. Powder feeding rod, 211. End cap, 2111. Step, 3. Powder shaking area, 31. Powder shaking piece, 311. Powder beating rod, 32. Powder shaking motor, 411. Driving pulley, 412. Driven pulley, 4121. Mounting shaft, 413. Scraper belt, 4131. Scraper, 414. Transverse motor, 421. Outer housing tube, 4211. Lifting inlet, 4212. Lifting outlet, 422. Spiral rod, 423. Lifting motor, 43. Temporary storage box, 431. Transverse inlet, 432. Slip plate, 5.V housing, 51. Transverse slot, 52. Vertical tensioning plate, 53.
Detailed Description
Examples: referring to fig. 1-12, a circulating powder shaking device comprises a powder storage area 1, a powder distribution area 2, a powder shaking area 3 and a recovery assembly; the powder storage area 1 is positioned at the front upper position of the powder distribution area 2; the powder shaking area 3 is behind the powder distribution area 2; the PET film 0 entering the circulating powder shaking device passes through the lower part of the powder storage area 1, and then sequentially enters the powder distribution area 2 and the powder shaking area 3; the powder storage area 1 is responsible for providing hot melt adhesive powder, and is a source of hot melt adhesive powder circulation and a terminal point of hot melt adhesive powder circulation; the hot melt adhesive powder recycled into the powder storage area 1 needs to be uniformly spread out to enter the powder distribution area 2 for combining with the PET film 0; the powder distribution area 2 is responsible for the combination of the hot melt adhesive powder and the PET film 0, and the combination stability of the hot melt adhesive powder directly influences the heat transfer printing effect of the PET film 0; the powder shaking area 3 is responsible for shaking out redundant hot melt adhesive powder on the PET film 0; the recovery component is responsible for supplying the hot melt adhesive powder shaken off by the powder shaking area 3 and the hot melt adhesive powder which is not combined with the PET film 0 by the powder distribution area 2 to the powder storage area 1 again for recycling;
The recovery assembly comprises a transverse recovery mechanism, a vertical recovery mechanism and a temporary storage box 43; the transverse recovery mechanism is transversely arranged below the powder distribution area 2; the temporary storage box 43 is arranged at one end of the transverse recovery mechanism and is communicated with the transverse recovery mechanism; the lower part of the vertical recovery mechanism vertically penetrates through the temporary storage box 43 and is connected with the bottom of the temporary storage box 43, and the upper part of the vertical recovery mechanism is communicated with the powder storage area 1; the transverse recovery mechanism is used for recovering hot melt adhesive powder in the powder shaking area 3 and the powder distribution area 2; the temporary storage box 43 is used for transferring the recovered hot melt adhesive powder to a vertical recovery mechanism and has a certain temporary storage function; the vertical recovery mechanism is used for transferring the thermal rubber powder to the powder storage area 1;
The transverse recycling mechanism comprises a driving belt pulley 411, a driven belt pulley 412, a scraper belt 413 and a transverse motor 414; the driving belt wheel 411 is coaxially and fixedly connected with the output end of the transverse motor 414; the scraper belt 413 connects the driving pulley 411 and the driven pulley 412; a plurality of scrapers 4131 are uniformly distributed on the outer side surface of the scraper belt 413; the scraper 4131 is made of elastic material and is perpendicular to the outer side surface of the scraper belt 413; the transverse motor 414 drives the scraper belt 413 to circularly rotate through the driving belt pulley 411 and the driven belt pulley 412; the scraper 4131 on the scraper belt 413 scrapes hot melt adhesive powder falling below to transfer to the temporary storage box 43;
The vertical recovery mechanism comprises a vertical outer cover pipe 421, a spiral lifting rod 422 and a lifting motor 423; the outer cover tube 421 is inserted into the temporary storage box 43, the bottom is provided with a lifting inlet 4211, and the top is provided with a lifting outlet 4212 communicated with the powder storage area 1; the spiral lifting rod 422 is inserted into the outer cover tube 421, the bottom end is rotatably connected with the temporary storage box 43, the top end is in transmission connection with the output end of the lifting motor 423, and the side surface of the middle part is matched with the inner wall of the outer cover tube 421; the hot melt adhesive powder entered into the temporary storage box 43 enters the lifting inlet 4211 again; the lifting motor 423 drives the screw lifting rod 422 to rotate; the hot melt adhesive powder introduced into the lifting inlet 4211 is wound around and wound around by the spiral lifting rod 422; the inner wall of the outer cover tube 421 can prevent the hot melt adhesive powder from overflowing and falling; the convoluted hot melt adhesive powder enters the lift outlet 4212 from the lift outlet 4212;
The powder storage area 1 comprises a powder storage box, a spiral powder spreading rod 12 and a powder spreading motor 13; the bottom of the powder storage box comprises a powder discharging surface 111 in the middle, a powder returning surface 112 near the inner side and a vibrating surface 113 near the outer side; the powder return surface 112 and the vibration surface 113 are inclined relative to the powder discharge surface 111, so that the hot melt adhesive powder on the powder return surface 112 and the hot melt adhesive powder on the vibration surface 113 can be converged on the powder discharge surface 111 in the middle; the middle part of the powder discharging surface 111 is provided with a powder discharging opening 1111; the hot melt adhesive powder collected on the powder discharge surface 111 is discharged from the powder discharge port 1111; the lower end surface of the powder discharge port 1111 is covered with a layer of powder equalizing net 1112; the powder equalizing net 1112 can uniformly disperse and discharge the hot melt adhesive powder; two sides of the powder equalizing net 1112 are clamped with the powder discharging surface 111 through two transverse clamping plates 1113; each transverse clamping plate 1113 is L-shaped; longitudinal adjusting long holes 11131 are uniformly distributed on the transverse clamping plate 1113; the bolt penetrates through the powder discharging surface 111 from top to bottom, and is connected with the nut through threads after being adjusted to the long hole 11131; the position of the adjusting bolt on the adjusting long hole 11131 can control the interval between the transverse clamping plate 1113 and the surface perpendicular to the adjusting long hole 11131, so as to limit the coverage range of the hot melt adhesive powder discharged from the powder discharging net to the PET film 0, and further influence the uniform distribution degree of the hot melt adhesive powder; a plurality of direct vibrators 1131 are uniformly distributed and connected below the vibration surface 113; the present embodiment is composed of two direct oscillators 1131; the two direct vibrators 1131 can uniformly output vibration to the vibration surface 113, so that the hot melt adhesive powder of the vibration surface 113 can uniformly flow to the powder discharge port 1111; one end of the powder return surface 112 is communicated with the lifting outlet 4212 on the side wall of the powder storage box connected with the powder return surface 112; hot melt adhesive powder entering from the lift outlet 4212 reaches the powder return face 112; the spiral powder spreading rod 12 transversely penetrates through the powder storage box above the powder return surface 112 and is matched with the powder return surface 112, one end of the spiral powder spreading rod is rotationally connected with the side wall of the powder storage box, and the other end of the spiral powder spreading rod is in transmission connection with the powder spreading motor 13; the powder spreading motor 13 drives the spiral powder spreading rod 12 to uniformly distribute the hot melt adhesive powder coiled tape entering from the lifting outlet 4212 along the axial direction of the spiral powder spreading rod 12 and also along the transverse direction, and then uniformly discharges the hot melt adhesive powder coiled tape to the powder discharge outlet 1111 by means of the inclination of the powder return surface 112 and the power brought by the spiral powder spreading rod 12; as can be seen from the above, the powder storage box has two channels for heating the melt adhesive powder, an original powder adding channel corresponding to the vibration surface 113 and a recovered powder adding channel corresponding to the powder returning surface 112; all the hot melt adhesive powder is added into the powder storage box through an original powder adding channel; the hot melt adhesive powder is mainly recycled in the powder recycling and adding channel;
The powder distribution area 2 is provided with a transverse powder feeding rod 21; the powder feeding rod 21 is positioned above the PET film 0, and end covers 211 are fixedly connected to both ends of the powder feeding rod; the end cover 211 is provided with a step 2111 which is matched with the edge of the PET film 0 inwards; the distance between the two steps 2111 is matched with the width of the PET film 0; the powder feeding rod 21 is a movable part and is matched with the PET film 0 to enable the PET film 0 to drop into a V shape by utilizing self gravity; steps 2111 on two sides of the powder feeding rod 21 limit the PET film 0, so that the PET film 0 is smoothly circulated; in the circulation process of the PET film 0, the powder feeding rod 21 rotates along with the PET film 0 by using the end covers 211, and the PET film 0 enables hot melt adhesive powder falling on the PET film 0 in the powder storage area 1 to have a certain accumulation between the two end covers 211; the slender rod body in the middle of the powder feeding rod 21 reserves a space for hot melt adhesive powder accumulation; the powder feeding rod 21 can enable the PET film 0 to repeatedly cover the PET film 0 by accumulated hot melt adhesive powder in the rotating process, so that the acting time of the hot melt adhesive powder on the PET film 0 is prolonged;
The powder shaking area 3 is provided with a transverse powder shaking piece 31; the powder shaking piece 31 is arranged below the PET film 0, and a plurality of powder beating rods 311 are circumferentially distributed; the powder shaking member 31 of the present embodiment has two powder beating rods 311; the circumferential position of the powdering rod 311 is matched with the transfer route of the PET film 0; the end part of the powder shaking piece 31 is in transmission connection with a powder shaking motor 32; the powder shaking motor 32 drives the powder shaking piece 31 to rotate, and the powder beating rod 311 constantly beats redundant hot melt adhesive powder on the PET film 0; here, the action of the powdering device 311 causes the powdering device 21 to swing left and right; each time the powder beating rod 311 hits the PET film 0, the PET film 0 is carried along with the lifting and falling of the powder walking rod 21 matched with the PET film 0, the powder walking rod 21 is formed to reciprocate on the PET film 0, and the accumulated hot melt adhesive powder on the PET film 0 can cover more PET films 0.
The scraper belt 413 enters the inside of the temporary storage box 43, so that the hot melt adhesive powder scraped by the scraper 4131 can fully enter the temporary storage box 43.
The top end of the spiral lifting rod 422 is in belt transmission connection with the lifting motor 423, so that vibration caused by the operation of the lifting motor 423 has less influence on the rotation of the spiral lifting rod 422.
The temporary storage box 43 is provided with a transverse inlet 431 corresponding to the transverse recovery mechanism and a sliding inclined plane 432 below the transverse inlet 431; the lifting inlet 4211 corresponds to the landing ramp 432; the hot melt powder entering the temporary storage box 43 from the transverse inlet 431 can be directly sent to the lifting inlet 4211 through the sliding inclined surface 432, and then spirally upwards reach the powder storage box through the lifting inlet 4211.
The spiral powder spreading rod 12 is connected with the powder spreading motor 13 through belt transmission, so that the influence of vibration caused by the operation of the powder spreading motor 13 on the powder spreading rotation of the spiral powder spreading rod 12 is reduced.
A powder sliding plate 114 corresponding to the powder discharging port 1111 and the powder distributing area 2 is arranged below the powder discharging port 1111; the hot melt adhesive powder discharged from the powder discharge port 1111 enters the powder distribution area 2 through the powder sliding plate 114.
The powder shaking member 31 is connected with the powder shaking motor 32 through belt transmission, so that the influence of vibration caused by the operation of the powder shaking motor 32 on the powder shaking rotation of the powder shaking member 31 is reduced.
The circulating powder shaking device is also provided with a downward V-shaped shell 5; the upper part of the V-shaped shell 5 wraps the powder distribution area 2 and the powder shaking area 3, and the bottom end is provided with a transverse recovery mechanism; the V-shaped shell 5 gathers the hot melt powder scattered by the powder distribution area 2 and the hot melt powder shaken off by the powder shaking area 3 on the transverse recovery mechanism.
The side wall of the bottom end of the V-shaped shell 5 is provided with a transverse long hole 51, a vertical tensioning plate 52 and a tensioning screw 53 at the corresponding position of the driven pulley 412; a mounting shaft 4121 is rotatably connected to the driven pulley 412; the mounting shaft 4121 penetrates the transverse long hole 51; the tensioning screw 53 penetrates through the vertical tensioning plate 52 and is in threaded connection with the end part of the mounting shaft 4121; rotating the tensioning screw 53 adjusts the axial position of the mounting shaft 4121 and the driven pulley 412 rotatably coupled to the mounting shaft 4121 relative to the tensioning screw 53 to thereby adjust the tension of the scraper belt 413.
An entering inclined plane 1121 connected with the powder returning surface 112 is arranged below the lifting outlet 4212; the hot melt adhesive powder entering the cartridge through the lift outlet 4212 may enter the return face 112 via the entry ramp 1121 and be inerted to the screw applicator rod 12 for circulation.
The working process of the embodiment comprises the following steps of:
① Powder is added outside the powder storage box, and hot melt adhesive powder is evenly output: the external powder falls on the vibration surface 113; at this time, the vibrator 1131 is turned on, and the hot melt adhesive powder entering the vibration surface 113 uniformly slides to the powder discharge surface 111 due to the vibration of the vibrator 1131 and is discharged through the powder discharge port 1111; the powder equalizing net 1112 below the powder discharge port 1111 can uniformly pass through the hot melt adhesive powder; adjusting the spacing of the transverse clamping plates 1113 adjusts the coverage of the discharged hot melt adhesive powder; some of the hot melt adhesive powder is scattered on the PET film 0, and the other part of the hot melt adhesive powder is guided to flow to the powder distribution area 2 through the powder sliding plate 114;
② The powder feeding rod 21 in the powder distribution area 2 rotates along with the follow-up, and the PET film 0 is repeatedly covered: the hot melt adhesive powder on the PET film 0 and the hot melt adhesive powder flowing to the powder distribution area 2, one part falls into the middle area of the powder feeding rod 21 for accumulation, and the other part slides down to the transverse recovery mechanism by virtue of the V-shaped shell 5; the hot melt adhesive powder falling into the middle area of the powder feeding rod 21 can continuously roll along with the running of the PET film 0, repeatedly cover the PET film 0, and prolong the action time of the hot melt adhesive powder and the PET film 0; excess hot melt adhesive powder is accumulated and overflows from the two ends of the powder feeding rod 21 and finally enters the transverse recovery mechanism;
③ The powder shaking member 31 shakes off the excessive hot melt adhesive powder on the PET film 0: the powder shaking motor 32 is started to drive the powder shaking piece 31 to rotate; the powder beating rod 311 on the powder shaking piece 31 is continuously and greatly adhered below the PET film 0 with the hot melt adhesive powder, so that the excessive hot melt adhesive powder is shaken off; the shaken-off hot melt adhesive powder slides down to the transverse recovery mechanism through the V-shaped shell 5; the powder feeding rod 21 reciprocates on the PET film 0 due to the action of the powder shaking piece 31, and accumulated hot melt adhesive powder covers more PET film 0;
The above-mentioned step ②、③ can be synchronously performed while the PET film 0 is continuously operated;
④ The transverse recovery mechanism transports the hot melt adhesive powder into the temporary storage box 43: the transverse motor 414 is started, and the scraper belt 413 is driven to rotate through the driving belt pulley 411 and the driven belt pulley 412; the scraper 4131 on the scraper belt 413 scrapes the hot melt adhesive powder which finally falls to the bottom of the transverse recycling mechanism and transfers the hot melt adhesive powder to the temporary storage box 43;
⑤ The hot melt adhesive powder in the temporary storage box 43 is sent into the powder storage box through the vertical recovery mechanism: the hot melt adhesive powder entering the temporary storage box 43 is sent to the lifting inlet 4211 through the transverse inlet 431 and the sliding inclined plane 432; the lifting motor 423 is started to drive the spiral lifting rod 422 to rotate; the hot melt adhesive powder entering the lift inlet 4211 spirals upward to the lift outlet 4212 by means of the rotating screw lift rod 422; the final hot melt adhesive powder slides into the powder return face 112 of the powder storage box through the entering inclined face 1121;
⑥ The hot melt adhesive powder of the powder return surface 112 is uniformly discharged from the discharge port: starting the powder spreading motor 13, and enabling the spiral powder spreading rod 12 to take up the hot melt adhesive powder on the powder returning surface 112 to be uniformly distributed along the spiral powder spreading rod 12; the evenly distributed hot melt adhesive powder is evenly delivered to the powder discharging surface 111 by the inertia caused by a part of spiral powder spreading rod 12 and the inclination of the powder returning surface 112 and is discharged from the powder discharging port 1111, so that the recycling of the hot melt adhesive powder is realized.