Winding machine capable of degrading plastic film

Abstract

The utility model discloses a degradable plastic film winding machine which comprises a base, and the top of the base is connected with a lifting assembly used for supporting a material roll or / and a material rolling frame in a sliding mode. A supporting assembly used for detachably installing the material rolling frame is fixed to the base, and a driving assembly used for driving the material rolling frame to rotate is connected to the supporting assembly. A tensioning assembly used for tensioning the plastic film is further fixed to one side of the supporting assembly on the base, a flattening and limiting assembly fixed to the base is further arranged on the side, away from the supporting assembly, of the tensioning assembly, and the flattening and limiting assembly is connected with the driving assembly and used for flattening and limiting the plastic film or driving the plastic film to move. The winding machine capable of degrading the plastic film solves the problems that in the prior art, feeding and discharging are difficult, operation is tedious and inconvenient, the tensioning effect is poor, the tensioning requirement cannot be met, and the winding effect is not ideal.

Description

TECHNICAL FIELD

[0001] The utility model relates to degradable plastic film technical field especially relates to a kind of winding machine of degradable plastic film. BACKGROUND

[0002] In prior art, the utility model with publication number CN221875920U discloses a kind of winding device for biodegradable plastic film, including bottom plate, the both ends of bottom plate are respectively fixedly installed with side plate and lower plate, the top of lower plate is equipped with upper plate, and the shaft body is rotatably connected between upper plate and side plate by bearing, winding roller is equipped between two shaft bodies, and the both ends of winding roller surface are all sleeved with collar ring.However, the winding device for biodegradable plastic film in the patent technical scheme realizes feeding and discharging by the dismounting between upper plate and lower plate, so that feeding and discharging are difficult, and the operation is complicated and inconvenient, and the structure effect of tensioning is poor, cannot well satisfy tensioning demand, and winding effect is not ideal.The applicant is engaged in the production of plastic film for a long time, finds that feeding and discharging are difficult in prior art, and the operation is complicated and inconvenient, and the tensioning effect is poor, cannot satisfy tensioning demand, and winding effect is not ideal.

[0003] Therefore, it is necessary to develop a kind of winding machine of degradable plastic film for the above-mentioned defects. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of winding machine of degradable plastic film, can solve the problems, such as feeding and discharging difficulty, operation is complicated and inconvenient, tensioning effect is poor, cannot satisfy tensioning demand, and winding effect is not ideal in prior art.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model discloses a kind of winding machine of degradable plastic film, including base, the top of base is slidably connected with the lifting assembly for supporting roll or / and roll rack;The base is fixed with the support component for detachably installing the roll rack, the support component is connected with the driving component for driving the roll rack rotation;The side of the support component on the base is also fixed with the tensioning component for tightening plastic film, the side of the tensioning component away from the support component is also equipped with the flattening limiting component fixed on the base, the flattening limiting component is connected with the driving component, for flattening plastic film and limiting or driving plastic film movement.

[0007] Further, the lifting assembly comprises a lifting slider, the base is provided with a lifting sliding groove for slidingly mounting the lifting slider, a drive screw is threadedly connected to the lifting slider, one end of the drive screw is rotatably connected to the base, and the other end of the drive screw penetrates through the base and the support assembly and is fixedly connected with a lifting handle; a telescopic cylinder is fixedly connected to the top of the lifting slider, a lifting frame is fixedly connected to the top of the telescopic cylinder, the lifting frame is provided with a lifting groove for accommodating a roll or a roll frame, and the lifting groove is a V-shaped groove.

[0008] Further, the support assembly comprises support frames symmetrically arranged on both sides of the base, the support frame on one side is rotatably connected with a first support shaft, one end of the first support shaft is connected with the drive assembly, and the other end of the first support shaft penetrates through the support frame and is inserted into the roll frame, the roll frame is a cylindrical structure with limiting protrusions on the outer edges of both sides of the outer surface, a limiting block is slidingly connected on the first support shaft, the roll frame is provided with a clamping groove matched with the limiting block, and the limiting block is provided with a first fastening bolt abutting against the first support shaft; the support frame on the other side is slidingly connected with a second support shaft, the second support shaft is symmetrically connected with fastening nuts on both sides of the support frame; a bearing is fixedly connected to the end of the second support shaft away from the support frame, and the roll frame is provided with a mounting groove matched with the bearing.

[0009] Further, the tensioning assembly comprises a plurality of first tensioning units and second tensioning units arranged alternately, the first tensioning unit comprises first tensioning frames symmetrically arranged on both sides of the base, a first tensioning mechanism is mounted between the two first tensioning frames, the first tensioning mechanism comprises a tensioning slider slidingly clamped on the first tensioning frame, and the first tensioning frame is provided with a tensioning sliding groove arranged in the vertical direction and matched with the tensioning slider; a tensioning spring is fixedly connected to the upper and lower sides of the tensioning slider, a tensioning plate is fixedly connected to the side of the tensioning spring away from the tensioning slider, a tensioning screw is rotatably connected to the side of the tensioning plate away from the tensioning spring, the tensioning screw is threadedly connected with the first tensioning frame and fixedly connected with a tensioning handle penetrating through the first tensioning frame; a tensioning shaft is rotatably connected between the two tensioning sliders, two tensioning limiting blocks are slidingly connected to the tensioning shaft, a tensioning bolt is threadedly connected to any one of the tensioning limiting blocks and abuts against the tensioning shaft; the second tensioning unit comprises a second tensioning frame and a second tensioning mechanism, the second tensioning mechanism is the same in structure as the first tensioning mechanism, and the height of the second tensioning frame is greater than the height of the first tensioning frame.

[0010] Further, the flattening limiting assembly comprises limiting racks symmetrically arranged on two sides of the base, and first limiting shafts are rotationally connected to the limiting racks; one end of the first limiting shaft is rotationally connected to the limiting rack on one side, and the other end penetrates through the limiting rack on the other side and is connected with the driving assembly; a second limiting shaft is arranged on the top of the first limiting shaft; a limiting slider is slidingly clamped on the limiting rack, and a limiting sliding groove is arranged on the limiting rack in the vertical direction to slidingly install the limiting slider; a limiting spring is arranged on the bottom of the limiting slider, and the bottom of the limiting spring is fixed with the bottom of the limiting sliding groove; a limiting screw rod is rotationally connected to the top of the limiting slider, and a limiting handle is arranged on the top of the limiting screw rod and penetrates through the limiting rack; one end of the second limiting shaft is rotationally connected to the limiting slider on one side, and the other end rotationally penetrates through the limiting slider on the other side and is connected with the driving assembly.

[0011] Further, the driving assembly comprises a driving motor fixed on the supporting assembly, a driving sprocket is fixedly connected to the output end of the driving motor, the driving sprocket is fixedly connected with the first supporting shaft and connected with a driven sprocket through a chain, the driven sprocket is fixed with the first limiting shaft and coaxially fixedly connected with a driving gear, the driving gear is meshed with a driven gear, and the driven gear is fixed with the second limiting shaft.

[0012] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0013] The lifting assembly assists in supporting the roll material frame, operation is more flexible, and the cumbersome disassembly and assembly steps are reduced; the tensioning assembly is arranged to better tension the plastic film, ensure the winding effect, and the flattening limiting assembly is arranged to flatten and limit the plastic film, and further ensure the tensioning effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described in connection with the drawings.

[0015] Figure 1 It is a side view structural schematic view of the winding machine for degradable plastic film of the utility model;

[0016] Figure 2 It is a front view structural schematic view of the winding machine for degradable plastic film of the utility model;

[0017] Figure 3 It is a sectional view along Figure 1 B-B line;

[0018] Figure 4 It is a sectional view alongFigure 1 Sectional view structure diagram of A-A line in the figure;

[0019] Figure 5 It is the sectional view structure diagram of the first tension unit part in the utility model;

[0020] Figure 6 It is along Figure 2 Sectional view structure diagram of C-C line in the figure.

[0021] Explanation of reference numerals: 1, base; 2, roll rack; 3, lifting assembly; 4, support assembly; 5, drive assembly; 6, tensioning assembly; 7, flattening limiting assembly; 21, limiting convex; 31, lifting slider; 32, drive screw; 33, lifting handle; 34, telescopic cylinder; 35, lifting frame; 41, support frame; 42, first support shaft; 43, limiting block; 44, first fastening bolt; 45, second support shaft; 46, fastening nut; 47, bearing; 51, drive motor; 52, drive sprocket; 53, driven sprocket; 54, driving gear; 55, driven gear; 61, first tension unit; 62, second tension unit; 71, limiting frame; 72, first limiting shaft; 73, second limiting shaft; 74, limiting slider; 75, limiting spring; 76, limiting screw; 77, limiting handle; 351, lifting slot; 611, first tension frame; 612, tensioning slider; 613, tensioning spring; 614, tensioning plate; 615, tensioning screw; 616, tensioning handle; 617, tensioning shaft; 618, tensioning limiting block; 619, tensioning bolt. DETAILED DESCRIPTION

[0022] The core of the utility model is a winding machine of degradable plastic film, which can solve the problems of difficult feeding, complicated operation, poor tensioning effect, unable to meet the tensioning demand and unsatisfactory winding effect in the prior art.

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0025] Please refer to Figures 1 to 6 , a specific embodiment of the winding machine of the degradable plastic film provided by the utility model will be described. The winding machine of the degradable plastic film comprises a base 1, the top of the base 1 is slidably connected with a lifting assembly 3 for supporting a roll or / and a roll support 2; the base 1 is fixed with a supporting assembly 4 for detachably mounting the roll support 2, and the supporting assembly 4 is connected with a driving assembly 5 for driving the roll support 2 to rotate; one side of the supporting assembly 4 on the base 1 is also fixed with a tensioning assembly 6 for tensioning the plastic film, and the side of the tensioning assembly 6 away from the supporting assembly 4 is also provided with a flattening limiting assembly 7 fixed on the base 1, the flattening limiting assembly 7 is connected with the driving assembly 5, and is used for flattening and limiting the plastic film or driving the plastic film to move.

[0026] For the convenience of description, please refer to Figure 1 and Figure 2 , any point in space is taken as the origin, the setting direction of the lifting assembly 3 relative to the base 1 is taken as the Z-axis, the setting direction of the driving assembly 5 relative to the base 1 is taken as the X-axis, and the direction of a straight line perpendicular to the X-axis and the Z-axis is taken as the Y-axis, thereby establishing a rectangular coordinate system, wherein the XY plane is a horizontal plane, the direction indicated on the horizontal plane is a horizontal direction, and the direction indicated by the Z-axis is a vertical direction.

[0027] In a specific embodiment of the utility model, the lifting assembly 3 comprises a lifting sliding block 31, the base 1 is provided with a lifting sliding groove for slidingly installing the lifting sliding block 31, a driving screw 32 is threadedly connected to the lifting sliding block 31, one end of the driving screw 32 is rotatable relative to the base 1, the other end of the driving screw 32 penetrates through the base 1 and the supporting assembly 4, and a lifting handle 33 is fixedly installed; a telescopic cylinder 34 is installed on the top of the lifting sliding block 31, a lifting frame 35 is fixedly installed on the top of the telescopic cylinder 34, the lifting frame 35 is provided with a lifting groove 351 for accommodating the roll or the roll support 2, and the lifting groove 351 is a V-shaped groove.

[0028] In a specific embodiment of the utility model, support assembly 4 includes the support frame 41 that sets up symmetrically at the both sides of base 1, the first support shaft 42 is rotatably connected on the support frame 41 at one side, one end of first support shaft 42 is connected with drive assembly 5, the other end penetrates support frame 41 and inserts roll material frame 2, roll material frame 2 is the cylindrical structure that the limiting convex 21 is arranged on the both sides outer edge of outer surface, limiting block 43 is slidably connected on first support shaft 42, roll material frame 2 is equipped with the clamping groove that is matched with the clamping of limiting block 43, limiting block 43 is equipped with the first fastening bolt 44 that is abutted with first support shaft 42;The second support shaft 45 is slidably connected on the support frame 41 at the other side, and the fastening nut 46 is symmetrically screwed on the both sides of support frame 41 on the second support shaft 45;The bearing 47 is installed on the end of second support shaft 45 away from support frame 41, and roll material frame 2 is equipped with the installation groove that is matched with the clamping of bearing 47.

[0029] In a specific embodiment of the utility model, tensioning assembly 6 includes a plurality of first tensioning units 61 and second tensioning units 62 arranged alternately, the first tensioning unit 61 includes the first tensioning frame 611 symmetrically arranged on both sides of the base 1, and the first tensioning mechanism is installed between the two first tensioning frames 611. The first tensioning mechanism includes a tensioning slide block 612 slidably engaged on the first tensioning frame 611, and the first tensioning frame 611 is provided with a tensioning slide groove arranged in the vertical direction and matched with the tensioning slide block 612. The tensioning slide block 612 is fixedly installed on the upper and lower sides, and the tensioning spring 613 is fixedly connected on the side away from the tensioning slide block 612. The tensioning plate 614 is rotatably connected on the side away from the tensioning spring 613, and the tensioning screw 615 is threadedly connected with the first tensioning frame 611 and fixedly connected with the tensioning handle 616 penetrating the first tensioning frame 611. The tensioning shaft 617 is rotatably connected between the two tensioning slide blocks 612, and the two tensioning limiting blocks 618 are slidably connected on the tensioning shaft 617. The tensioning bolt 619 is threadedly connected penetrating any tensioning limiting block 618, and the tensioning bolt 619 abuts against the tensioning shaft 617. The second tensioning unit 62 includes a second tensioning frame and a second tensioning mechanism, and the second tensioning mechanism has the same structure as the first tensioning mechanism. The height of the second tensioning frame is greater than the height of the first tensioning frame 611.

[0030] In a specific embodiment of the utility model, the flattening limiting assembly 7 includes the limiting frame 71 symmetrically arranged on both sides of the base 1, and the first limiting shaft 72 is rotatably connected to the two limiting frames 71; one end of the first limiting shaft 72 is rotatably connected to the limiting frame 71 on one side, and the other end penetrates the limiting frame 71 on the other side and is connected to the driving assembly 5; the top of the first limiting shaft 72 is provided with the second limiting shaft 73; the limiting slide block 74 is slidingly clamped on the limiting frame 71, and the limiting slide groove for slidingly installing the limiting slide block 74 is arranged on the limiting frame 71 in the vertical direction; the limiting spring 75 is installed at the bottom of the limiting slide block 74, and the bottom of the limiting spring 75 is fixed to the bottom of the limiting slide groove; the limiting screw 76 is rotatably connected to the top of the limiting slide block 74, and the limiting handle 77 is installed at the top of the limiting screw 76 and penetrates the limiting frame 71; one end of the second limiting shaft 73 is rotatably connected to the limiting slide block 74 on one side, and the other end rotatably penetrates the limiting slide block 74 on the other side and is connected to the driving assembly 5.

[0031] In a specific embodiment of the utility model, the driving assembly 5 includes the driving motor 51 fixed on the supporting assembly 4, the driving sprocket 52 is fixedly connected to the output end of the driving motor 51, the driving sprocket 52 is fixedly connected with the first supporting shaft 42 and has the driven sprocket 53 connected through the chain, the driven sprocket 53 is fixed with the first limiting shaft 72 and coaxially fixedly connected with the driving gear 54, the driving gear 54 is meshed with the driven gear 55, and the driven gear 55 is fixed with the second limiting shaft 73. Here, as long as the above-mentioned driving motor 51 and the related performance of the telescopic cylinder 34 can be realized, they are within the protection scope of the application file.

[0032] Compared with the prior art, the winding machine for degradable plastic film can more flexibly and conveniently disassemble and assemble the winding material frame 2 for installing the material roll through the structure that the lifting assembly 3 is slidingly arranged, the lifting assembly 3 assists in supporting the winding material frame 2, the operation is more flexible, and the cumbersome steps of disassembling and assembling are reduced; the plastic film can be better tensioned through the arrangement of the tensioning assembly 6, the winding effect is guaranteed, and in addition, the plastic film can be flattened and limited through the arrangement of the flattening limiting assembly 7, the tensioning effect is further guaranteed.

[0033] The working process of the degradable plastic film winding machine is as follows: one end of the winding frame 2 is inserted on the first supporting shaft 42, the telescopic cylinder 34 is controlled to rise, the lifting frame 35 is abutted with the winding frame 2, and the winding frame 2 is supported; according to the required tension degree, the position of the tensioning sliding block 612 is adjusted by rotating the tensioning screw 615 through the tensioning handle 616, and then the spacing between the first tensioning mechanism and the second tensioning mechanism is adjusted; according to the size of the plastic film to be wound, the position of the tensioning limiting block 618 is adjusted, so that the surface of the two tensioning limiting blocks 618 on one side is flush with the surface of the limiting convex 21 on one side of the two sides of the winding frame 2; the limiting clamping block 43 is clamped on the winding frame 2, the limiting clamping block 43 is limited through the first fastening bolt 44, the bearing 47 on the second supporting shaft 45 is clamped and abutted with the other end of the winding frame 2, and the fastening nut 46 is adjusted to complete the fixation of the second supporting shaft 45; the plastic film is passed between the first limiting shaft 72 and the second limiting shaft 73, and then passes through the second tensioning unit 62 and the first tensioning unit 61 in turn, and finally is fixed on the winding frame 2; the position of the limiting sliding block 74 is adjusted by rotating the limiting screw 76 through the limiting handle 77, so that the second limiting shaft 73 is abutted with the top of the plastic film, and the plastic film is extruded between the first limiting shaft 72 and the second limiting shaft 73; the driving motor 51 is started, the winding frame 2 is driven to rotate by the first supporting shaft 42, the plastic film is wound on the winding frame 2, and the driving sprocket 52 drives the driven sprocket 53 to rotate, the driven sprocket 53 drives the driving gear 54 and the first limiting shaft 72 to rotate, and the driving gear 54 controls the second limiting shaft 73 to rotate synchronously through the driven gear 55.

[0034] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0035] The above-described embodiments only describe the preferred mode of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical solutions of the utility model made by those skilled in the art without departing from the design spirit of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A winding machine of degradable plastic film, characterized in that: The utility model provides a plastic film winding device, including base (1), the top of base (1) is slidably connected with the lifting assembly (3) for supporting roll or / and roll frame (2), the support assembly (4) for detachably installing roll frame (2) is fixed on base (1), the drive assembly (5) for driving roll frame (2) rotation is connected on support assembly (4), the side of support assembly (4) on base (1) is also fixed with the tensioning assembly (6) for tightening plastic film, the side away from support assembly (4) of tensioning assembly (6) is also equipped with the flattening limiting assembly (7) fixed on base (1), flattening limiting assembly (7) is connected with drive assembly (5), is used for flattening plastic film and is driven plastic film moves and is limited.

2. The windup of degradable plastic film according to claim 1, characterized in that: The lifting assembly (3) includes a lifting slider (31), the base (1) is provided with a lifting sliding groove for slidingly installing the lifting slider (31), a drive screw (32) is threadedly connected to the lifting slider (31), one end of the drive screw (32) is rotatable with the base (1), and a lifting handle (33) is fixedly installed at the other end of the drive screw (32) penetrating through the base (1) and the support assembly (4); a telescopic cylinder (34) is installed at the top of the lifting slider (31), a lifting frame (35) is fixedly installed at the top of the telescopic cylinder (34), and the lifting frame (35) is provided with a lifting groove (351) for accommodating a roll or a roll frame (2), the lifting groove (351) is a V-shaped groove.

3. The windup of degradable plastic film as claimed in claim 1 wherein: The support assembly (4) includes support frames (41) symmetrically arranged on both sides of the base (1), a first support shaft (42) is rotatably connected to the support frame (41) on one side, one end of the first support shaft (42) is connected to the drive assembly (5), the other end penetrates through the support frame (41) and is inserted into the roll frame (2), the roll frame (2) is a cylindrical structure with limiting protrusions (21) arranged on the outer edges of both sides of the outer surface, a limiting block (43) is slidably sleeved on the first support shaft (42), the roll frame (2) is provided with a clamping groove matched with the limiting block (43), and a first fastening bolt (44) is arranged on the limiting block (43) and abuts against the first support shaft (42); a second support shaft (45) is slidably connected to the support frame (41) on the other side, and fastening nuts (46) are symmetrically threadedly connected to both sides of the support frame (41) on the second support shaft (45); a bearing (47) is installed at one end of the second support shaft (45) away from the support frame (41), and the roll frame (2) is provided with a mounting groove matched with the bearing (47).

4. The degradable plastic film winding machine according to claim 1, characterized in that: The tensioning assembly (6) comprises a plurality of first tensioning units (61) and second tensioning units (62) arranged alternately, the first tensioning unit (61) comprises first tensioning frames (611) symmetrically arranged on both sides of the base (1), a first tensioning mechanism is installed between the two first tensioning frames (611), the first tensioning mechanism comprises a tensioning sliding block (612) slidingly engaged on the first tensioning frame (611), the first tensioning frame (611) is provided with a tensioning sliding groove arranged in the vertical direction and matched with the tensioning sliding block (612); the upper and lower sides of the tensioning sliding block (612) are fixedly installed with tensioning springs (613), the side of the tensioning spring (613) away from the tensioning sliding block (612) is fixedly connected with a tensioning plate (614), and the side of the tensioning plate (614) away from the tensioning spring (613) is rotatably connected with a tensioning screw (615); the tensioning screw (615) is threadedly connected with the first tensioning frame (611) and fixedly connected with a tensioning handle (616) penetrating through the first tensioning frame (611); the two tensioning sliding blocks (612) are rotatably connected with a tensioning shaft (617), the tensioning shaft (617) is slidingly connected with two tensioning limiting blocks (618), and the tensioning limiting blocks (618) are threadedly connected with tensioning bolts (619) penetrating through the tensioning limiting blocks (618), wherein the tensioning bolts (619) abut against the tensioning shaft (617); the second tensioning unit (62) comprises a second tensioning frame and a second tensioning mechanism, the second tensioning mechanism is the same in structure as the first tensioning mechanism, and the height of the second tensioning frame is greater than that of the first tensioning frame (611).

5. The degradable plastic film winding machine according to claim 3, characterized in that: The flattening limiting assembly (7) comprises limiting frames (71) symmetrically arranged on both sides of the base (1), and first limiting shafts (72) rotatably connected to the limiting frames (71); one end of the first limiting shaft (72) is rotatably connected to the limiting frame (71) on one side, and the other end penetrates through the limiting frame (71) on the other side and is connected with the driving assembly (5); the top of the first limiting shaft (72) is provided with a second limiting shaft (73); the limiting frame (71) is slidingly engaged with a limiting sliding block (74); the limiting frame (71) is provided with a limiting sliding groove in the vertical direction, and the limiting sliding block (74) is slidingly installed in the limiting sliding groove; a limiting spring (75) is installed at the bottom of the limiting sliding block (74), and the bottom of the limiting spring (75) is fixed to the bottom of the limiting sliding groove; a limiting screw (76) is rotatably connected to the top of the limiting sliding block (74), and a limiting handle (77) is installed at the top of the limiting screw (76) penetrating through the limiting frame (71); one end of the second limiting shaft (73) is rotatably connected to the limiting sliding block (74) on one side, and the other end rotatably penetrates through the limiting sliding block (74) on the other side and is connected with the driving assembly (5).

6. The windup of degradable plastic film according to claim 5, characterized in that: The driving assembly (5) comprises a driving motor (51) fixed on the supporting assembly (4), a driving chain wheel (52) fixedly connected on the output end of the driving motor (51), the driving chain wheel (52) is fixedly connected with the first supporting shaft (42) and connected with a driven chain wheel (53) through a chain, the driven chain wheel (53) is fixed with the first limiting shaft (72) and coaxially fixedly connected with a driving gear (54), the driving gear (54) is engaged with a driven gear (55), and the driven gear (55) is fixed with the second limiting shaft (73).

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