Disclosure of Invention
In order to solve the problem that positioning is inaccurate due to inclination of a pitching side when a puncture device is installed, the application provides a pitching fine adjustment mechanism for the puncture device and the puncture device, which are used for eliminating installation errors of the pitching side, so that positioning puncture accuracy is guaranteed.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
A every single move fine setting mechanism for piercing depth, including fixed mounting on location piercing depth constructs regulation seat and fixed mounting on being used for supporting on the frame of location piercing depth constructs at least one guide rail, the axial of guide rail is unanimous with piercing depth's every single move side, the regulation seat slides and sets up on the guide rail, and set up on the frame be used for adjusting regulation seat and guide rail relative position's regulating unit, arbitrary all overlap on the at least one end of guide rail is equipped with and is used for keeping the spring that the regulation seat was balanced.
In order to elaborately explain the technical problems and the structural elaboration of the present application, before explaining the working principle, the working principle and the application scenario of the existing puncturing device are first described, so as to facilitate the detailed explanation of the principle. The whole puncture device is fixedly arranged on the ground through the frame, when the puncture device is arranged on the ground, due to the ground level or other installation reasons, the frame can incline or deflect to a certain extent, and although the possible installation error can be reduced or lowered after the adjustment as far as possible, the frame still exists, especially after an embedded part of which the frame is fixed on the ground is arranged on the ground, the problem of linearity error can not be solved by increasing or reducing the adjustment of a gasket mode, and because of the fact, the accurate adjustment of the position state of the puncture device after the installation is required, the optimal target after the adjustment is that the puncture device is in an initial state or an initial position, and the positioning or puncture direction is vertical.
In practical situations, the direction of the deviation may occur in any direction and at any angle, and in order to achieve zero setting of the initial position, the positioning direction of the initial position is in absolute vertical, two adjustable directions perpendicular to each other are needed to achieve the zero setting. The puncture device itself can realize left and right sliding to realize angle offset for realizing the puncture of any angle, so that the puncture device can take any point in the stroke range as an initial origin through system initialization in the left and right inclined direction, but fine adjustment on the pitching side cannot be realized through the mode, and the special structure of the application is invented. After the application background is clear, the relative sliding guide rail and the adjusting seat can be linearly adjusted in the adjustable travel range through the action of the adjusting unit, so that installation and leveling errors caused by the fact that the frame is fixedly installed on the ground in the process are eliminated, the initial origin direction of positioning can be overlapped with the vertical direction through the puncture device, and the purpose of accurate positioning is achieved.
As one of the structural designs compatible with the precision and the adjustment convenience simultaneously, preferably, the adjustment unit comprises a spherical seat fixedly mounted on the frame, an adjustment screw rod hinged with the spherical seat, the free end of the adjustment screw rod penetrates through the adjustment seat and extends outwards to be in threaded connection with a second adjustment nut, and a first adjustment nut is further arranged between the adjustment seat and the spherical seat on the adjustment screw rod. In terms of structure, the balance of force can be realized by the cooperation of a single first adjusting nut or a single second adjusting nut and a spring, and the adjusting seat is kept in a controlled state, but the spring can deform after being subjected to changing external force, so that the first adjusting nut and the second adjusting nut are required to be simultaneously arranged in order to avoid error reintroduction caused by other external force effects after reaching preset zeroing precision, the relative positions of the adjusting seat and the frame are limited after the adjusting seat is fixed through two directions, and the problem that the error is possibly reintroduced is solved.
In order to eliminate the internal stress between the adjusting seat and the guide rail, improve the smoothness of the adjusting seat and reduce the adjusting resistance, preferably, the number of the guide rails is two, the guide rails are distributed at two ends of the adjusting seat, the guide rails and the adjusting seat are in transition fit, and the guide rails are arc-shaped guide rails. The guide rail and the adjusting seat are in transition fit, so that the relative free sliding between two opposite components is ensured, and the position of the adjusting seat can be limited, and the adjusting seat cannot shake in directions except the constraint of the guide rail.
As another preferred scheme, two guide rails are distributed at two ends of the adjusting seat, clearance fit is adopted between the upper surface and the lower surface of the guide rails and the adjusting seat, transition fit is adopted between the left surface and the right surface of the guide rails and the adjusting seat, and the guide rails are linear guide rails. The purpose of the clearance arrangement between the upper surface and the lower surface of the guide rail and the adjusting seat is to accommodate the deviation generated by the arc track in the vertical direction when the adjusting seat drives the puncture mechanism to move at the pitching side, so that the sliding adjustment of the adjusting seat is not limited. The aim of adopting transition fit between the left and right surfaces of the guide rail and the adjusting seat is to ensure that the adjusting seat cannot generate excessive offset and shake in the left and right directions to introduce new errors, so far, as a person of ordinary skill in the art has already realized that various settings can be adopted for the cross section shape of the assailing guide rail, such as square, rectangle, circle and the like, all can limit left and right movement, and the structural fit allowing up and down movement should be brought into the interpretation range of the technical scheme, which is not listed here.
The puncture device comprises the pitching fine adjustment mechanism for the puncture device, a frame, a positioning puncture mechanism and a positioning puncture mechanism, wherein the pitching fine adjustment mechanism is used for the puncture device;
The positioning puncture mechanism comprises a driving mechanism, a first linear moving mechanism, a second linear moving mechanism and a first mounting plate which are arranged on the arc-shaped guide rail in a sliding manner, wherein a plurality of pulleys used for clamping the arc-shaped guide rail are arranged on the first mounting plate, the arc-shaped guide rail is fixedly connected with an arc-shaped rack, and the driving mechanism comprises a driving gear meshed with the arc-shaped rack;
The first mounting plate is further provided with a first linear movement mechanism, the first linear movement mechanism comprises a first sliding seat which moves in a reciprocating mode, the first sliding seat is further fixedly provided with a second linear movement mechanism which is perpendicular to the first linear movement mechanism, and the second linear movement mechanism comprises a second sliding seat which moves in a reciprocating mode and is used for mounting a needle holder.
Further, the first linear moving mechanism comprises at least one first linear guide rail and a first motor which are fixedly arranged on the first mounting plate, a first screw rod is connected with the first motor in a driving mode, the first screw rod is connected with the first sliding seat in a driving mode, the first sliding seat is arranged on the first linear guide rail in a sliding mode, the second linear moving mechanism comprises at least one second linear guide rail fixedly connected with the first sliding seat, a second motor fixedly arranged at one end of the second linear guide rail, a second screw rod connected with the second motor in a driving mode, and a second sliding seat which is connected with the second screw rod in a driving mode and is arranged on the second linear guide rail in a sliding mode and used for mounting the needle holder.
Still further preferably, the device further comprises a gear anti-backlash mechanism, wherein the gear anti-backlash mechanism comprises an anti-backlash mechanism arranged on the first mounting plate, the anti-backlash mechanism comprises at least one elastic member for eliminating meshing jumping gaps of the driving gear and the arc-shaped rack, the first mounting plate is hinged with a second mounting plate for fixedly mounting the driving mechanism, the second mounting plate is further provided with at least one through hole, the first mounting plate is fixedly provided with a fastener penetrating through the through hole and used for limiting the swing amplitude of the second mounting plate, an annular gap exists between the fastener and the through hole, the elastic member is a spring, one end of the spring is connected with the second mounting plate, and the other end of the spring is connected with the first mounting plate.
As one of the preferable settings of gear clearance eliminating mechanism, the second mounting plate extends outwards along radial to form the convex part that is used for installing first mount pad, install the second mount pad on the first mounting plate, be provided with on the second mount pad and be used for installing the guide bar of spring, install on the guide bar can follow guide bar reciprocating motion's regulator, be provided with between regulator and the first mount pad and overlap and establish on the guide bar the spring.
As another parallel arrangement scheme, the hinge point of the second mounting plate and the first mounting plate is positioned below the second mounting plate, the first mounting plate is positioned on the left side of the hinge point, and the spring is always in a compressed state, or the hinge point of the second mounting plate and the first mounting plate is positioned above the second mounting plate, and the first mounting plate is positioned on the left side of the hinge point, and the spring is always in a stretched state.
The beneficial effects are that:
The pitch fine adjustment mechanism provided by the invention can eliminate zero setting of the initial origin of the puncture mechanism after installation and eliminate installation errors, so that the initial positioning origin direction of the puncture device coincides with the vertical direction, any needle track of the puncture device in the positioning puncture process is ensured not to introduce installation errors, and the positioning puncture precision is improved.
The invention also provides a gear backlash eliminating mechanism which can always keep the mutual meshing state of the gear and the arc-shaped rack and overcome the problem of transmission precision reduction caused by abnormal meshing or tooth jump due to abnormal arc of the arc-shaped rack caused by machining or installation errors.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is an isometric view of the structure of the lancing apparatus of the present application.
Fig. 2 is an isometric view of another visual structure of fig. 1.
Fig. 3 is an isometric view of another visual structure of fig. 1.
Fig. 4 is an enlarged view of the structure of the area a in fig. 3.
Fig. 5 is an enlarged view of the structure of the region B in fig. 4.
Fig. 6 is a structural axial view of the second linear motion mechanism.
Fig. 7 is a rear view of the assembled state of the arcuate guide rail and the positioning puncture mechanism.
Fig. 8 is a front view of fig. 7.
Fig. 9 is an enlarged view of the structure of the region C in fig. 8.
Fig. 10 is a cross-sectional view taken along section symbol E-E in fig. 8.
Fig. 11 is an enlarged view of the structure of the D area in fig. 10.
Fig. 12 is a schematic view showing a mounting structure of the pitch trimmer mechanism to the puncture device.
Fig. 13 is an enlarged view of the structure of the region F in fig. 12.
Fig. 14 is a structural isometric view of a pitch trimmer mechanism.
Fig. 15 is a top view of fig. 14.
Fig. 16 is a schematic view of a yaw angle r and a pitch angle a of the lancing device that may be present.
The drawing shows that the device comprises a 1-base, a 2-frame, a 3-arc arm, a 4-arc guide rail, a 41-arc rack, a 5-positioning puncture mechanism, a 51-driving mechanism, a 511-third motor, a 512-driving gear, a 513-pulley, a 52-first linear movement mechanism, a 521-first motor, a 522-first lead screw, a 523-first linear guide rail, a 524-first sliding seat, a 53-second linear movement mechanism, a 531-second motor, a 532-second lead screw, a 533-second linear guide rail, 534-second sliding seat, a 54-first mounting plate, a 6-clearance eliminating mechanism, a 61-second mounting plate, a 62-first mounting plate, a 63-spring, a 64-regulator, a 65-guide rod, a 66-second mounting plate, a 67-sleeve, a 68-fastener, a 69-annular clearance, a 7-fine adjustment mechanism, a 71-guide rail, a 72-spring, a 73-adjustment seat, a 74-adjustment lead screw, a 75-spherical seat, a 76-first adjustment nut and a 77-second adjustment nut.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description of the present application, if any, are used for distinguishing between the descriptions and not necessarily for indicating or implying a relative importance.
Furthermore, the terms "horizontal," "vertical," and the like in the description of the present application, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1:
As shown in fig. 12 to 16 in combination with the description, the present embodiment provides a pitch fine adjustment mechanism for a puncture device, which includes an adjustment seat 73 fixedly installed on a positioning puncture mechanism 5 and at least one guide rail 71 fixedly installed on a frame 2 for supporting the positioning puncture mechanism 5, wherein an axial direction of the guide rail 71 coincides with a pitch side of the puncture device, the adjustment seat 73 is slidably disposed on the guide rail 71, and an adjustment unit disposed on the frame 2 for adjusting a relative position of the adjustment seat 73 and the guide rail 71, and a spring 72 for keeping balance of the adjustment seat 73 is sleeved on at least one end of any guide rail 71.
In order to elaborately explain the technical problems and the structural elaboration of the present application, before explaining the working principle, the working principle and the application scenario of the existing puncturing device are first described, so as to facilitate the detailed explanation of the principle. The whole puncture device is fixedly arranged on the ground through the frame 2, when the installation is finished, due to the ground level or other installation reasons, the frame 2 may have certain inclination or deflection, although the possible installation error is reduced or lowered after debugging as much as possible, or the base 1 is additionally arranged at the bottom of the frame 2, the problem that the linear error cannot be solved by adding or reducing the adjustment of a gasket mode when the frame 2 is fixed on the embedded part after the embedded part is arranged on the ground is still existed, and because the accurate adjustment of the installed position state of the puncture device is required, the best object after the adjustment is that the puncture device is in the initial state or the initial position, and the positioning or the puncture direction is the vertical direction.
In practical situations, the direction of the deviation may occur in any direction and any angle, and in order to realize zero adjustment of the initial position, the positioning direction of the initial position is in absolute vertical direction, two mutually perpendicular adjustable directions are needed to realize the deflection around the y axis, namely, the left-right deflection angle r in the x-z plane shown in fig. 16, and the deflection around the x axis, namely, the pitching deflection angle a in the y-z plane, and the preset highest precision is achieved and the installation error is eliminated only after the left-right deflection angle r and the pitching deflection angle a are adjusted to 0. The puncture device itself can realize left and right sliding to realize angle offset for realizing the puncture of any angle, so that the puncture device can take any point in the stroke range as an initial origin through system initialization in the left and right inclined direction, but fine adjustment on the pitching side cannot be realized through the mode, and the special structure of the application is invented. After the application background is clear, it is easy to know that the guide rail 71 and the adjusting seat 73 which slide relatively can realize linear adjustment in the adjustable travel range through the action of the adjusting unit, so that the installation and leveling errors caused by the process that the frame 2 is fixedly installed on the ground are eliminated, and the initial origin direction of positioning and the vertical direction of the puncture device are overlapped, so that the purpose of accurate positioning is achieved.
As one of the structural designs compatible with both precision and adjustment convenience, preferably, the adjustment unit includes a spherical seat 75 fixedly mounted on the frame 2, an adjustment screw 74 hinged to the spherical seat 75, a free end of the adjustment screw 74 penetrates the adjustment seat 73 and extends outwards to be in threaded connection with a second adjustment nut 77, and a first adjustment nut 76 is further disposed on the adjustment screw 74 between the adjustment seat 73 and the spherical seat 75. Structurally, the force balance can be realized by the cooperation of the single first adjusting nut 76 or the second adjusting nut 77 and the spring 72, and the adjusting seat 73 is kept in a controlled state, but the spring 72 is deformed after being subjected to a changing external force, so that in order to avoid that errors are reintroduced due to the action of other external forces after reaching the preset zeroing precision, the first adjusting nut 76 and the second adjusting nut 77 are required to be simultaneously arranged, and the relative positions of the adjusting seat 73 and the frame 2 are limited and cannot be relatively moved after the adjusting seat 73 is fixed through two directions, so that the problem that errors can be reintroduced is solved. As an alternative to this, as shown in fig. 15, the spring 72 is mounted with the adjustment seat 73 on the side of the first adjustment nut 76, and the spring 72 is in a compressed state. When the adjusting seat 73 is required to be adjusted downwards along the direction shown in the drawing, the first adjusting nut 76 is firstly loosened, the second adjusting nut 77 is slowly adjusted until the preset ideal position is reached, the position of the adjusting seat 73 cannot be changed due to the elastic force of the spring 72, at the moment, the first adjusting nut 76 is adjusted upwards until the adjusting seat 73 is fixed, and when the first adjusting nut 76 and the second adjusting nut 77 are both in a fastening state, the position of the adjusting seat 73 is fixed, and the double-nut adjusting has the advantage of being capable of playing a role in preventing loosening in later period. If the adjustment seat 73 is required to be adjusted upwards, the adjustment is performed in the above manner, that is, the second adjustment nut 77 is adjusted first, and the first adjustment nut 76 is fastened after reaching the preset desired position.
This embodiment, as a preferred structural arrangement of the pitch trimmer of the present application, also provides two different implementations for the specific design of the rail 71:
In order to eliminate the internal stress between the adjusting seat 73 and the guide rail 71, improve the smoothness of the adjusting seat 73 and reduce the adjusting resistance, preferably, two guide rails 71 are distributed at two ends of the adjusting seat 73, and the guide rail 71 and the adjusting seat 73 are in transition fit, and the guide rail 71 is an arc guide rail. The purpose of the transition fit of the guide rail 71 and the adjustment seat 73 is to ensure a relative free sliding movement between the two opposing members while limiting the position of the adjustment seat 73 from rocking in directions other than the constraint of the guide rail 71.
And in the second scheme, two guide rails 71 are distributed at two ends of the adjusting seat 73, the upper surface and the lower surface of the guide rails 71 are in clearance fit with the adjusting seat 73, the left surface and the right surface of the guide rails 71 are in transition fit with the adjusting seat 73, and the guide rails 71 are linear guide rails. The purpose of the clearance between the upper and lower surfaces of the guide rail 71 and the adjusting seat 73 is to accommodate the deviation of the arc track in the vertical direction generated when the adjusting seat 73 drives the puncture mechanism 5 to move at the pitch side, so that the sliding adjustment of the adjusting seat 73 is not limited. The purpose of adopting transition fit between the left and right surfaces of the guide rail 71 and the adjusting seat 73 is to ensure that the adjusting seat 73 does not generate excessive offset and shake in the left and right directions to introduce new errors, so far, as it is clear to those skilled in the art that to realize the above structural functions, the cross section shape of the assailing guide rail 71 can be variously set, such as square, rectangle, circle and the like, all of which can limit left and right movement, and the structural fit allowing up and down movement should be included in the interpretation range of the technical scheme, which is not listed here.
Example 2:
the embodiment also provides a puncture device, which is shown in the accompanying drawings 1-6 in combination with the specification, and comprises a pitching fine adjustment mechanism for the puncture device, which is provided by the embodiment 1, and a frame 2 fixedly installed on the ground, wherein an arc-shaped arm 3 is hinged on the frame 2, an arc-shaped guide rail 4 is installed on the arc-shaped arm 3, and the positioning puncture mechanism 5 is slidably installed on the arc-shaped guide rail 4;
The positioning puncture mechanism 5 comprises a driving mechanism 51, a first linear moving mechanism 52, a second linear moving mechanism 53 and a first mounting plate 54 which are slidably arranged on the arc-shaped guide rail 4, wherein a plurality of pulleys 513 for clamping the arc-shaped guide rail 4 are arranged on the first mounting plate 54, the arc-shaped guide rail 4 is fixedly connected with the arc-shaped rack 41, the driving mechanism 51 comprises a driving gear 512 meshed with the arc-shaped rack 41, and when deflection is required, the driving mechanism 51 controls the driving gear 512 to be meshed with the arc-shaped rack 41 through a third motor 511, so that the puncture mechanism 5 is driven to slide back and forth along the arc-shaped guide rail 4, and left and right deflection in a state shown in fig. 1 is realized. When the angle is set, the first linear motion mechanism 52 and the second linear motion mechanism 53 are required to perform parallel movement at the angle, specifically as follows:
The first mounting plate 54 is further provided with a first linear movement mechanism 52, the first linear movement mechanism 52 comprises a first sliding seat 524 which moves reciprocally, the first sliding seat 524 is further fixedly provided with a second linear movement mechanism 53 which is perpendicular to the first linear movement mechanism 52, and the second linear movement mechanism 53 comprises a second sliding seat 534 which moves reciprocally and is used for mounting a needle holder.
In this embodiment, the first linear moving mechanism 52 includes at least one first linear guide rail 523 fixedly mounted on the first mounting plate 54 and a first motor 521, the first motor 521 is in driving connection with a first screw rod 522, the first screw rod 522 is in driving connection with a first slide seat 524, the first slide seat 524 is slidably disposed on the first linear guide rail 523, the second linear moving mechanism 53 includes at least one second linear guide rail 533 fixedly connected with the first slide seat 524, a second motor 531 fixedly mounted on one end of the second linear guide rail 533, a second screw rod 532 in driving connection with the second motor 531, and a second slide seat 534 in driving connection with the second screw rod 532 and slidably disposed on the second linear guide rail 533 for mounting a needle holder.
As further shown in fig. 2, 4 and 6, since the first linear motion mechanism 52 and the second linear motion mechanism 53 are perpendicular to each other and the operation principle of the first linear motion mechanism 52 and the second linear motion mechanism 53 is the same, the second motor 531 serves as a power supply device to drive the second screw 532 to rotate, thereby pushing the second slider 534 to reciprocate on the second linear guide 533. By the simultaneous combined movement of the first linear movement mechanism 52 and the second linear movement mechanism 53, the needle passage positioning and the puncture at any position can be realized within a rectangular range surrounded by the first linear guide 523 and the second linear guide 533 in a longer length.
In this embodiment, the device further comprises a gear anti-backlash mechanism, and further referring to fig. 7-11 of the specification, the gear anti-backlash mechanism comprises an anti-backlash mechanism 6 mounted on the first mounting plate 54, the anti-backlash mechanism 6 comprises at least one elastic member for eliminating the meshing jump clearance between the driving gear 512 and the arc-shaped rack 41, the first mounting plate 54 is hinged with a second mounting plate 61 for fixedly mounting the driving mechanism 51, the second mounting plate 61 is further provided with at least one through hole, the first mounting plate 54 is fixedly mounted with a fastener 68 penetrating through the through hole for limiting the swing amplitude of the second mounting plate 61, an annular clearance 69 is formed between the fastener 68 and the through hole, the elastic member is a spring 63, one end of the spring 63 is connected with the second mounting plate 61, and the other end of the spring 63 is connected with the first mounting plate 54.
The working principle of the gear anti-backlash mechanism is as follows:
As shown in fig. 9, under the action of the spring 63, the whole second mounting plate 61 and the driving mechanism 51 deflect around the hinge point of the second mounting plate 61 and the first mounting plate 54, and the deflection direction is the direction in which the driving gear 512 approaches the arc-shaped rack 41, so that the problems of gaps and jumping are eliminated. Since manufacturing and assembly errors are small, the deflection amplitude of the second mounting plate 61 must be limited, otherwise new errors will be additionally introduced. The second mounting plate 61 is restrained by the engagement of the fastener 68 with the through hole, the fastener 68 being removably and fixedly connected to the first mounting plate 54 and extending through the through hole such that the maximum deflection of the second mounting plate 61 during deflection is dependent upon the difference between the inside diameter of the through hole and the outside diameter of the fastener 68, the greater the difference the greater the deflectable angle and vice versa. It should be noted that the angle or magnitude of deflection is not limited by the specific dimensions, but is flexibly set and modified according to the actual dimensions and progress of the actual application components, and generally, the manner of replacing fasteners 68 of different diameters is a viable and cost-effective manner.
Further, in order to avoid abrasion of the through hole and the fastener 68 on the second mounting plate 61 during repeated friction contact, and to limit movement or inclination of the second mounting plate 61 in the axial direction, as another preferred mode, a sleeve 67 may be sleeved on the fastener 68, an annular gap 69 exists between the axial outer diameter of the sleeve 67 and the through hole, and as shown in fig. 11 in detail, the sleeve 67 is further provided with an annular end cover disposed between the fastener 68 and the second mounting plate 61. The second mounting plate 61 is prevented from being deflected in the axial direction by the annular end cap and fasteners 68 for abutting against the second mounting plate 61.
As a specific structural arrangement of the anti-backlash mechanism 6, as shown in fig. 9 in detail, the second mounting plate 61 extends radially outwards to form a convex part for mounting the first mounting seat 62, the first mounting plate 54 is provided with a second mounting seat 66, the second mounting seat 66 is provided with a guide rod 65 for mounting the spring 63, the guide rod 65 is provided with a regulator 64 capable of moving reciprocally along the guide rod 65, and the spring 63 sleeved on the guide rod 65 is arranged between the regulator 64 and the first mounting seat 62.
The purpose of stable engagement of the arc-shaped rack 41 and the driving gear 512 is achieved, and as another parallel arrangement scheme, the hinge point of the second mounting plate 61 and the first mounting plate 54 is located below the second mounting plate 61, the first mounting seat 62 is located at the left side of the hinge point, the spring 63 is always in a compressed state, or the hinge point of the second mounting plate 61 and the first mounting plate 54 is located above the second mounting plate 61, the first mounting seat 62 is located at the left side of the hinge point, and the spring 63 is always in a stretched state.
It should be noted that, whichever of the above solutions is used, the general inventive concept is unchanged, and the transmission error is introduced by the abnormal jump generated by the engagement between the drive gear 512 and the arc-shaped rack 41, because no extra gap is generated between the arc-shaped rack and the drive gear by the positive pressure or the pulling force generated by the elastic member, such as the spring 63. Under the action of the elastic member, such as the spring 63 or the elastic sheet, the driving gear 512 always maintains a good meshing state with the arc-shaped rack 41, and in time, the arc-shaped rack 41 has a fine machining or installation error, so that under the action of the elastic force of the elastic member, the driving gear 512 is in self-adaptive meshing with the arc-shaped rack 41, thereby achieving the purpose of eliminating redundant gaps.
In light of the foregoing, it is also possible for those skilled in the art to achieve clearance elimination in a non-hinged manner, for example, by slidably disposing the driving mechanism 51 with the driving gear 512 on the first mounting plate 54, and always applying a positive pressure to the driving mechanism 51 through the spring 63 or other elastic members, so that the driving gear 512 always maintains a good engagement with the curved rack 41, thereby achieving the purposes of stable engagement and clearance elimination. Similarly, the present embodiment is not only applicable to the application between the gear and the rack, but also applicable to other structures involving gear engagement, so as to avoid or reduce transmission errors.
In order to achieve linear adjustment, in this embodiment, the adjuster 64 is screwed to the guide rod 65. The adjustment of the compression or tension of the spring 63 is achieved by changing the position of the adjuster 64 so as to meet the external forces required to ensure engagement under different conditions.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.