Winding device for heat transfer printing film production

Abstract

The utility model belongs to the technical field of winding devices, and relates to a winding device for heat transfer film production, which comprises a bottom plate, the top of the bottom plate is fixedly connected with a fixing rod, the fixing rod is provided with a winding mechanism of a heat transfer film, the top of the bottom plate is provided with a positioning mechanism of the heat transfer film, and the winding mechanism is matched with the positioning mechanism. A first sliding block is arranged in the fixing rod in an up-down sliding mode, the first sliding block is connected with the fixing rod through a first spring, a pressing mechanism is fixedly arranged on one side of the first sliding block, and the pressing mechanism and the first sliding block are both matched with the winding mechanism. The device has the advantages that after the winding drum is fixed to the sleeve through the clamping block, the second sliding block can leave the bottom of the first sliding block, under the action of the elastic force of the first spring, the first sliding block can be pushed to move downwards, the pressing roller can move downwards, when the heat transfer printing film is wound on the winding drum, the pressing roller can abut against the wound heat transfer printing film, and therefore the heat transfer printing film is not prone to falling off. And the phenomenon of roll scattering in the rolling process is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of winding devices and relates to a winding device for producing thermal transfer films. Background Art

[0002] Thermal transfer film is a medium material for thermal transfer process. Thermal transfer decoration process is a process of transferring the decorative pattern on the thermal transfer to the surface of the building material to be decorated by heating the thermal transfer film once, forming a high-quality decorative film. After the thermal transfer mold is processed, it needs to be rolled onto a roll for easy storage and transportation, so a winding device is needed.

[0003] A UV transfer film winding device disclosed in Chinese patent CN219326371U is provided with a reel. When in use, the reel is put on a turntable, and then the reel is rotated so that the slot is aligned with the inclined surface block. The worm is rotated to drive the worm wheel to rotate, and then the No. 1 threaded rod is rotated. The No. 1 threaded rod rotates to move the sleeve along the connecting groove toward the turntable, and then the inclined surface plate is driven to move, so that the inclined surface plate pushes the inclined surface block to move to the outside of the turntable, and then it is inserted into the slot to complete the installation and fixation of the reel.

[0004] The winding device directly winds up the thermal transfer film on the reel by rotating the reel, and the thermal transfer film needs to maintain a certain degree of tension during the winding process so that the reel is relatively tight when winding. Therefore, if the reel is loose during the winding process, the layers of the rolled transfer film are not tight enough, and the film is prone to loose rolls, which affects the winding quality.

[0005] A winding device for winding up an anti-sticking transfer film is disclosed in Chinese patent CN216189766U. The winding device is provided with a lower pressure piece. When the transfer film is wound up, the transfer film passes through the inner top of the lower pressure piece and fits with the rotating drum. Due to the arrangement of the slide plate, the top plate and the spring, the elasticity of the spring pushes the slide plate and the top plate. One end of the top plate squeezes the protective layer, causing the lower pressure piece to rotate downward. The lower pressure piece drives the rotating drum to press down the transfer film, thereby keeping the transfer film in a taut state.

[0006] When the winding device is used, the transfer film needs to pass through the inner top of the lower pressure piece and then fit with the rotating drum. After passing through the rotating drum, it is wound on the winding roller. The transfer film is easily damaged during the up and down pulling process.

[0007] In order to solve the above problems, the utility model proposes a winding device for producing thermal transfer films. Utility Model Content

[0008] In order to solve the problems existing in the background technology, the utility model proposes a winding device for producing thermal transfer films.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: comprising a bottom plate, the top of the bottom plate is fixedly connected with a fixing rod, a winding mechanism of the thermal transfer film is arranged on the fixing rod, a positioning mechanism of the thermal transfer film is arranged on the top of the bottom plate, and the winding mechanism and the positioning mechanism cooperate;

[0010] A first slider is provided inside the fixed rod for sliding up and down movement. The first slider is connected to the fixed rod through a first spring. A clamping mechanism is fixedly provided on one side of the first slider. Both the clamping mechanism and the first slider cooperate with the winding mechanism.

[0011] Further, the positioning mechanism includes a first limiting plate and a second limiting plate, and the second limiting plate is fixedly connected to the upper surface of the bottom plate;

[0012] A first slide groove is provided on the upper surface of the bottom plate, a first screw rod is rotatably connected inside the first slide groove, a first motor is fixedly connected to one side of the bottom plate, and the first motor drives the first screw rod to rotate;

[0013] The bottom end of the first limiting plate is slidably connected in the first sliding groove, and the bottom end of the first limiting plate is threadedly sleeved on the first screw rod.

[0014] Furthermore, the top ends of the adjacent sides of the first limiting plate and the second limiting plate are both provided with limiting grooves, and both limiting grooves are rounded.

[0015] Further, the clamping mechanism comprises a clamping roller, one side of the first sliding block is rotatably connected to a connecting shaft, and the clamping roller is fixedly connected to one end of the connecting shaft;

[0016] The fixing rod is provided with a second slide groove, a side surface of the fixing rod is provided with a first through hole, the first through hole is connected with the second slide groove, the first slider is slidably connected in the second slide groove, and the connecting shaft is movably arranged in the first through hole;

[0017] One end of the first spring is fixedly connected to the top wall of the second sliding groove, and the other end of the first spring is fixedly connected to the top surface of the first sliding block.

[0018] Furthermore, the winding mechanism comprises a reel and a sleeve, the sleeve is rotatably connected to one side of the fixed rod, and the reel is movably sleeved on the sleeve;

[0019] The sleeve is provided with a fixing assembly for fixing the reel, and the fixing rod is provided with a driving assembly for driving the sleeve to rotate.

[0020] Further, the fixing assembly includes two clamping blocks, which are symmetrically slidably arranged on the sleeve in an upper and lower direction, the cross-sectional shape of the inner hole of the sleeve is rectangular, the end of the clamping block slides through the sleeve, and the inner wall of the reel is provided with two clamping grooves adapted to the shape of the end of the clamping block, and the two clamping blocks are respectively engaged with the corresponding clamping grooves;

[0021] The adjacent ends of the two clamping blocks are fixedly connected to a second spring, and the other end of the second spring is fixedly connected to the inner wall of the sleeve;

[0022] A second slider is slidably disposed inside the second slide groove, the second slider is slidably matched with the first slider, and a moving component for driving the second slider to slide is disposed inside the second slide groove;

[0023] One side of the second slider is rotatably connected to the second rotating shaft, and the other end of the second rotating shaft is fixedly connected to the third slider. A second through hole is opened on the side of the fixed rod, and the two ends of the second through hole are respectively connected to the inner cavity of the sleeve and the second sliding groove, and the third slider is abutted and cooperated with the two blocks.

[0024] Further, the driving assembly includes a first gear and a second gear, the first gear and the second gear mesh with each other when in contact, and the first gear is fixedly sleeved on the second rotating shaft;

[0025] A second motor is fixedly connected to one side of the fixed rod, and a first rotating shaft is fixedly connected to an output end of the second motor. The first rotating shaft movably passes through the second slider, and the first rotating shaft is rotatably connected to the inside of the fixed rod. The second gear is fixedly sleeved on the first rotating shaft.

[0026] Furthermore, the moving component includes a second screw rod, which is rotatably connected to the inside of the fixed rod, one end of the second screw rod rotates through the fixed rod, the end of the second screw rod extending to the outside of the fixed rod is fixedly connected to a nut, and the bottom end of the second slider is threadedly sleeved on the second screw rod.

[0027] Furthermore, the moving assembly includes an electric push rod, which is fixedly connected to one side of the fixed rod. The output shaft of the electric push rod slides through the fixed rod and is fixedly connected to one side of the second sliding block.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] 1. The winding device for the production of thermal transfer film is provided with a clamping roller. After the roll is fixed on the sleeve by a clamping block, the second slider will leave the bottom of the first slider. Under the action of the first spring force, the first slider will be pushed downward, so that the clamping roller will move downward, so that when the thermal transfer film is rolled on the roll, the clamping roller will press the rolled thermal transfer film tightly, reducing the situation of loose rolls during the rolling process. At the same time, under the action of the first spring, the clamping roller can rise and fall with the thickness of the roll, improving practicality.

[0030] 2. The winding device for producing the thermal transfer film is provided with a pressure roller and a reel, and the pressure roller and the reel are arranged up and down, so that the pressure roller directly presses the thermal transfer film wound on the reel, and there is no need to move the thermal transfer film multiple times, which is convenient to use.

[0031] 3. The winding device for producing the thermal transfer film is provided with two clamping blocks in the sleeve. The two clamping blocks are moved up and down by the third slider, so that the roll can be installed or removed, which is convenient for replacing the roll. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural schematic diagram of embodiment 1 of the utility model;

[0033] Figure 2 It is a schematic diagram of the structure inside the fixing rod in Embodiment 1 of the utility model;

[0034] Figure 3 This utility model Figure 2 The enlarged structural diagram at A in the middle;

[0035] Figure 4 It is a schematic diagram of the structure inside the fixing rod in Example 2 of the utility model.

[0036] In the figure: 1. bottom plate; 2. first limit plate; 3. second limit plate; 4. first slide groove; 5. first screw rod; 6. first motor; 7. fixing rod; 8. second motor; 9. nut; 10. clamping roller; 11. reel; 12. limit groove; 13. first spring; 14. second slide groove; 15. first through hole; 16. first slider; 17. second slider; 18. second screw rod; 19. connecting shaft; 20. first rotating shaft; 21. first gear; 22. block; 23. slot; 24. second spring; 25. second through hole; 27. second rotating shaft; 28. third slider; 29. ​​electric push rod; 30. sleeve; 31. second gear. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Example 1

[0039] like Figure 1-Figure 3As shown, the technical solution adopted by the utility model is as follows: a winding device for producing a thermal transfer film comprises a bottom plate 1, a fixing rod 7 is fixedly connected to the top of the bottom plate 1, and a winding mechanism for the thermal transfer film is arranged on the fixing rod 7.

[0040] The winding mechanism comprises a reel 11 and a sleeve 30 . The sleeve 30 is rotatably connected to one side of the fixed rod 7 , and the reel 11 is movably sleeved on the sleeve 30 .

[0041] The sleeve 30 is provided with a fixing component for fixing the reel 11 .

[0042] The fixing assembly includes two clamping blocks 22, which are symmetrically slidably arranged on the sleeve 30. The cross-sectional shape of the inner hole of the sleeve 30 is rectangular, and the ends of the clamping blocks 22 slide through the sleeve 30. Two clamping grooves 23 matching the shapes of the ends of the clamping blocks 22 are provided on the inner wall of the reel 11, and the two clamping blocks 22 are respectively engaged with the corresponding clamping grooves 23.

[0043] One end of the two clamping blocks 22 that is close to each other is fixedly connected to a second spring 24 , and the other end of the second spring 24 is fixedly connected to the inner wall of the sleeve 30 .

[0044] The fixing rod 7 is provided with a second slide groove 14, and a first slider 16 is slidably arranged inside the second slide groove 14. The first slider 16 is connected to the fixing rod 7 through a first spring 13. One end of the first spring 13 is fixedly connected to the top wall of the second slide groove 14, and the other end of the first spring 13 is fixedly connected to the top surface of the first slider 16.

[0045] The second slide groove 14 is provided with a second slider 17 which is slidably arranged inside. The second slider 17 and the first slider 16 are slidably matched. One end surface of the top of the second slider 17 and one end surface of the bottom of the first slider 16 are both inclined surfaces, and the two inclined surfaces are adapted to each other. The second slide groove 14 is provided with a moving component which drives the second slider 17 to slide.

[0046] The moving assembly includes a second screw rod 18, which is rotatably connected to the inside of the fixed rod 7. One end of the second screw rod 18 rotates through the fixed rod 7, and the end of the second screw rod 18 extending to the outside of the fixed rod 7 is fixedly connected to a nut 9. The bottom end of the second slider 17 is threadedly sleeved on the second screw rod 18.

[0047] One side of the second slider 17 is rotatably connected to the second rotating shaft 27, and the other end of the second rotating shaft 27 is fixedly connected to the third slider 28. A second through hole 25 is provided on the side of the fixed rod 7, and the two ends of the second through hole 25 are respectively connected to the inner cavity of the sleeve 30 and the second slide groove 14. The third slider 28 is in abutment with the two clamping blocks 22.

[0048] The fixed rod 7 is provided with a driving assembly for driving the sleeve 30 to rotate.

[0049] The driving assembly includes a first gear 21 and a second gear 31 , which mesh with each other when in contact with each other. The first gear 21 is fixedly sleeved on the second rotating shaft 27 .

[0050] A second motor 8 is fixedly connected to one side of the fixed rod 7, and a first rotating shaft 20 is fixedly connected to the output end of the second motor 8. The first rotating shaft 20 rotates through the fixed rod 7, and the second rotating shaft 20 passes through the second slider 17 and the second rotating shaft 20 is slidably mounted on the second slider 17, and the first rotating shaft 20 is rotatably connected to the inside of the fixed rod 7. The second gear 31 is fixedly sleeved on the first rotating shaft 20.

[0051] A positioning mechanism for the thermal transfer film is arranged on the top of the bottom plate 1, and the winding mechanism cooperates with the positioning mechanism.

[0052] The positioning mechanism comprises a first limiting plate 2 and a second limiting plate 3 , and the second limiting plate 3 is fixedly connected to the upper surface of the base plate 1 .

[0053] The upper surface of the bottom plate 1 is provided with a first slide groove 4, and a first screw rod 5 is rotatably connected inside the first slide groove 4. A first motor 6 is fixedly connected to one side of the bottom plate 1, and the first motor 6 drives the first screw rod 5 to rotate.

[0054] The bottom end of the first limiting plate 2 is slidably connected to the first sliding groove 4 , and the bottom end of the first limiting plate 2 is threadedly sleeved on the first screw rod 5 .

[0055] The tops of the adjacent sides of the first limiting plate 2 and the second limiting plate 3 are both provided with limiting grooves 12, and both limiting grooves 12 are rounded. When winding, the two sides of the thermal transfer film are respectively located in the two limiting grooves 12, which is convenient for conveying the thermal transfer film.

[0056] A clamping mechanism is fixedly provided on one side of the first slide block 16. The clamping mechanism and the first slide block 16 are both matched with the winding mechanism.

[0057] The clamping mechanism includes a clamping roller 10. A connecting shaft 19 is rotatably connected to one side of the first sliding block 16, and the clamping roller 10 is fixedly connected to one end of the connecting shaft 19.

[0058] A first through hole 15 is formed on the side of the fixing rod 7 , and the first through hole 15 is connected to the second sliding groove 14 . A connecting shaft 19 is movably disposed in the first through hole 15 .

[0059] Working principle:

[0060] When in use, the reel 11 is sleeved on the sleeve 30 until one end of the reel 11 contacts the fixing rod 7. The reel 11 is rotated so that the positions of the two clamping grooves 23 are respectively matched with the clamping blocks 22.

[0061] The nut 9 is rotated to rotate the second screw rod 18 in the second slider 17. The second slider 17 slides in the second slide groove 14 to the side away from the nut 9, and the second slider 17 slides at the bottom of the first slider 16. The second slider 17 slides on the first rotating shaft 20. The second slider 17 pushes the second rotating shaft 27, the first gear 21, and the third slider 28 to move together, and the third slider 28 moves toward the two blocks 22. When the third slider 28 contacts the two blocks 22, it pushes the blocks 22 upward or downward respectively, and the ends of the blocks 22 extend to the outside of the sleeve 30 and move into the slot 23. The blocks 22 compress the corresponding second springs 24 respectively when sliding.

[0062] When the end of the block 22 abuts against the inner wall of the slot 23, the reel 11 is fixed on the sleeve 30. At this time, the first gear 21 moves to the top of the second gear 31 and is in a meshing state. The top surface of the second slider 17 leaves the bottom surface of the first slider 16.

[0063] At this time, under the elastic force of the first spring 13, the first slider 16 is pushed to slide downward in the second slide groove 14, driving the connecting shaft 19 to slide downward in the first through hole 15, and the pressure roller 10 slides downward on one side of the fixing rod 7 until the pressure roller 10 abuts against the upper surface of the reel 11.

[0064] Pull the thermal transfer film so that one side of the thermal transfer film is located in the limiting groove 12 on the second limiting plate 3. Start the first motor 6 to drive the first screw 5 to rotate, and the first screw 5 rotates in the first limiting plate 2, so that the bottom end of the first limiting plate 2 slides in the first slide groove 4, and the distance between the first limiting plate 2 and the second limiting plate 3 is changed until the other side of the thermal transfer film is located in the limiting groove 12 on the first limiting plate 2. At this time, the thermal transfer film is limited. Reduce the offset during the winding process.

[0065] The thermal transfer film is continuously pulled to fix the end of the thermal transfer film on the reel 11 , and the pressure roller 10 presses the thermal transfer film fixed on the reel 11 .

[0066] The second motor 8 is started to drive the first rotating shaft 20 to rotate, so that the second gear 31 rotates. The first gear 21 is driven to rotate, so that the second rotating shaft 27 and the third slider 28 rotate, and the third slider 28 drives the two blocks 22 to rotate the sleeve 30 and the reel 11 to reel the thermal transfer film.

[0067] During the winding process, the pressure roller 10 always presses against the thermal transfer film to reduce the possibility of loose rolls during the winding process. As the thickness of the wound thermal transfer film increases, the pressure roller 10 is pushed upward, causing the first slider 16 to slide upward and compress the first spring 13. The second slider 17 is also separated from the first slider 16.

[0068] After winding is completed, the second screw rod 18 is rotated by the nut 9, so that the second slider 17 slides to the side close to the nut 9. The third slider 28 and the first gear 21 are driven to slide, and the third slider 28 gradually leaves the block 22. Under the action of the elastic force of the second spring 24, the corresponding block 22 is pushed to slide into the sleeve 30. The third slider 28 slides to the top of the second gear 31, and the first gear 21 leaves the second gear 31.

[0069] Until the end of the block 22 completely leaves the slot 23, and the top surface of the second slider 17 contacts the bottom surface of the first slider 16, the reel 11 is restored to the initial state. At this time, the reel 11 can be removed from the sleeve 30 and replaced with a new reel 11.

[0070] Example 2

[0071] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:

[0072] The moving assembly includes an electric push rod 29 , which is fixedly connected to one side of the fixed rod 7 . The output shaft of the electric push rod 29 slides through the fixed rod 7 and is then fixedly connected to one side of the second sliding block 17 .

[0073] Working principle:

[0074] When the second sliding block 17 is moved, the electric push rod 29 is started so that the output shaft of the electric push rod 29 pushes the second sliding block 17 to slide in the second sliding groove 14 .

[0075] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A winding device for producing thermal transfer film, characterized in that: It comprises a bottom plate (1), the top of the bottom plate (1) is fixedly connected to a fixing rod (7), a thermal transfer film winding mechanism is arranged on the fixing rod (7), a thermal transfer film positioning mechanism is arranged on the top of the bottom plate (1), and the winding mechanism and the positioning mechanism cooperate; A first sliding block (16) is provided inside the fixed rod (7) for sliding up and down, the first sliding block (16) is connected to the fixed rod (7) via a first spring (13), a clamping mechanism is fixedly provided on one side of the first sliding block (16), and the clamping mechanism and the first sliding block (16) are both coordinated with the winding mechanism.

2. The winding device for producing thermal transfer film according to claim 1, characterized in that: The positioning mechanism comprises a first limiting plate (2) and a second limiting plate (3), wherein the second limiting plate (3) is fixedly connected to the upper surface of the bottom plate (1); The upper surface of the base plate (1) is provided with a first slide groove (4), the interior of the first slide groove (4) is rotatably connected to a first screw rod (5), and one side of the base plate (1) is fixedly connected to a first motor (6), and the first motor (6) drives the first screw rod (5) to rotate; The bottom end of the first limiting plate (2) is slidably connected in the first sliding groove (4), and the bottom end of the first limiting plate (2) is threadedly sleeved on the first screw rod (5).

3. The winding device for producing thermal transfer film according to claim 2, characterized in that: The top ends of the adjacent sides of the first limiting plate (2) and the second limiting plate (3) are both provided with limiting grooves (12), and both limiting grooves (12) are rounded.

4. The winding device for producing thermal transfer film according to claim 1, characterized in that: The clamping mechanism comprises a clamping roller (10), one side of the first sliding block (16) is rotatably connected to a connecting shaft (19), and the clamping roller (10) is fixedly connected to one end of the connecting shaft (19); The fixing rod (7) is provided with a second slide groove (14), a first through hole (15) is provided on a side surface of the fixing rod (7), the first through hole (15) is communicated with the second slide groove (14), the first sliding block (16) is slidably connected in the second slide groove (14), and the connecting shaft (19) is movably arranged in the first through hole (15); One end of the first spring (13) is fixedly connected to the top wall of the second sliding groove (14), and the other end of the first spring (13) is fixedly connected to the top surface of the first sliding block (16).

5. The winding device for producing thermal transfer film according to claim 4, characterized in that: The reeling mechanism comprises a reel (11) and a sleeve (30), wherein the sleeve (30) is rotatably connected to one side of the fixed rod (7), and the reel (11) is movably sleeved on the sleeve (30); The sleeve (30) is provided with a fixing assembly for fixing the reel (11), and the fixing rod (7) is provided with a driving assembly for driving the sleeve (30) to rotate.

6. The winding device for producing thermal transfer film according to claim 5, characterized in that: The fixing assembly comprises two clamping blocks (22), the two clamping blocks (22) are symmetrically slidably arranged on the sleeve (30) in an upper and lower direction, the cross-sectional shape of the inner hole of the sleeve (30) is rectangular, the ends of the clamping blocks (22) slide through the sleeve (30), and the inner wall of the reel (11) is provided with two clamping grooves (23) which are matched with the shapes of the ends of the clamping blocks (22), and the two clamping blocks (22) are respectively clamped and matched with the corresponding clamping grooves (23); The adjacent ends of the two clamping blocks (22) are both fixedly connected to a second spring (24), and the other end of the second spring (24) is fixedly connected to the inner wall of the sleeve (30); A second slider (17) is slidably disposed inside the second slide groove (14), the second slider (17) and the first slider (16) are slidably matched, and a moving component for driving the second slider (17) to slide is disposed inside the second slide groove (14); One side of the second slider (17) is rotatably connected to a second rotating shaft (27), and the other end of the second rotating shaft (27) is fixedly connected to a third slider (28). A second through hole (25) is provided on the side of the fixed rod (7), and the two ends of the second through hole (25) are respectively connected to the inner cavity of the sleeve (30) and the second slide groove (14), and the third slider (28) is in abutment with the two clamping blocks (22).

7. The winding device for producing thermal transfer film according to claim 6, characterized in that: The driving assembly comprises a first gear (21) and a second gear (31), wherein the first gear (21) and the second gear (31) mesh with each other when in contact, and the first gear (21) is fixedly sleeved on the second rotating shaft (27); A second motor (8) is fixedly connected to one side of the fixed rod (7); an output end of the second motor (8) is fixedly connected to a first rotating shaft (20); the first rotating shaft (20) movably passes through the second slider (17); the first rotating shaft (20) is rotatably connected to the inside of the fixed rod (7); and the second gear (31) is fixedly sleeved on the first rotating shaft (20).

8. The winding device for producing thermal transfer film according to claim 6, characterized in that: The moving assembly comprises a second screw rod (18), the second screw rod (18) is rotatably connected to the inside of the fixed rod (7), one end of the second screw rod (18) is rotatably passed through the fixed rod (7), the end of the second screw rod (18) extending to the outside of the fixed rod (7) is fixedly connected to a nut (9), and the bottom end of the second sliding block (17) is threadedly sleeved on the second screw rod (18).

9. The winding device for producing thermal transfer film according to claim 6, characterized in that: The moving assembly comprises an electric push rod (29), which is fixedly connected to one side of the fixed rod (7). The output shaft of the electric push rod (29) slides through the fixed rod (7) and is then fixedly connected to one side of the second sliding block (17).

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