Galvanizing device for vehicle metal parts

Abstract

The invention discloses a vehicle metal part galvanization device which comprises a supporting seat, four supporting rods are fixed to the upper end of the supporting seat, a mounting plate is fixed to the upper ends of the four supporting rods, a galvanization box is placed on the supporting seat, and a limited baffle plate is slidably connected to the galvanization box. And the two shielding plates seal the upper end of the galvanizing box, a sliding plate is arranged on the lower side of the mounting plate, and a driving mechanism for driving the two shielding plates to be opened and closed is mounted on the sliding plate. The baffle plate is automatically opened when in use and automatically closed when not in use, so that the heat loss of a galvanizing solution is reduced, the influence on the quality of a galvanized finished product is reduced, meanwhile, waste gas generated by galvanizing can be discharged and filtered, the galvanizing effect and the shaking of a galvanized part can be ensured, and the production efficiency is improved. And redundant zinc liquid on the galvanized part can be shaken off, the zinc liquid does not need to be shaken off manually by pushing the frame body to shake through a long rod, time and labor are saved, and higher safety is achieved.

Description

Technical Field

[0001] This invention relates to the field of galvanizing technology for metal parts, and more particularly to a galvanizing apparatus for vehicle metal parts. Background Technology

[0002] Hot-dip galvanizing, also known as hot-dip zinc plating, is an effective method of metal corrosion protection, mainly used in metal structures across various industries. It involves immersing rust-removed steel components in molten zinc at approximately 500°C, causing a zinc layer to adhere to the surface of the steel components, thus achieving corrosion protection.

[0003] The prior art discloses a galvanizing tank body and two rollers, with application number CN202021150956.7. The two rollers are connected at both ends to the four corners of the bottom sides of the inner cavity of the galvanizing tank body via bearings. Tension adjustment mechanisms are provided at the top front and the middle of the back side of the galvanizing tank body. These tension adjustment mechanisms consist of two fixed blocks, two telescopic rods, two movable blocks, and two springs. This metal surface galvanizing device, through the coordinated use of a dual-shaft motor, connecting rods, a bracket, and a driving helical gear and a driven helical gear, allows control of the two output shafts of the dual-shaft motor to rotate. This rotation of the two connecting rods, driven by the two driving helical gears and the two driven gears, drives two agitator paddles to rotate, improving the fluidity of the molten zinc inside the galvanizing tank body. This prevents the molten zinc from accumulating at the bottom of the galvanizing tank, avoiding waste and saving costs.

[0004] However, the aforementioned existing technologies have obvious drawbacks. When the hot-dip galvanizing equipment is in operation, the workpiece is immersed in the zinc plating solution, which generates a large amount of waste gas. If the waste gas directly enters the air, it can easily affect the air quality and reduce the reliability of the existing hot-dip galvanizing equipment. Moreover, when the existing hot-dip galvanizing equipment is in operation, the main body is in an open state, which causes the internal temperature of the main body to be affected by the external ambient temperature, thereby affecting the quality of the galvanized product and reducing the reliability of the existing hot-dip galvanizing equipment. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by providing a zinc plating apparatus for vehicle metal parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A galvanizing device for vehicle metal parts includes a support base, four support rods fixed to the upper end of the support base, a mounting plate fixed to the upper end of the four support rods, a galvanizing box placed on the support base, and two limiting baffles slidably connected to the galvanizing box, the two baffles sealing the upper end of the galvanizing box. A sliding plate is provided on the lower side of the mounting plate, and a drive mechanism for opening and closing the two baffles is mounted on the sliding plate. A movable plate, driven and cooperating with the sliding plate, is slidably connected to the bottom of the mounting plate, and two upright plates are fixed to the bottom of the movable plate. Two electric push rods are fixed to the bottom of the movable plate. A hanging plate is movably installed at the output end of the two electric push rods. Multiple hooks are fixed to the bottom of the hanging plate. An exhaust pipe is installed through the upper and lower parts of the hanging plate. An activated carbon adsorption net is installed at the upper end of the exhaust pipe. A short rod is fixed inside the exhaust pipe. A shaft is rotatably connected to the short rod. Multiple spiral blades are fixed on the shaft. Two staggered conveying pipes are installed through the exhaust pipe and opposite to the spiral blades. A gas supply mechanism is installed on both vertical plates to supply gas to the conveying pipes to drive the spiral blades to rotate.

[0008] Preferably, the galvanized box is equipped with two guide rails, each of which has a slider slidably connected inside it, and both sliders are fixedly connected to the baffle plate.

[0009] Preferably, the driving mechanism includes a first piston cylinder fixed to a galvanizing box, a first piston slidably connected inside the first piston cylinder, a push rod fixedly connected to the first piston, an L-shaped rod fixedly connected to the push rod, the L-shaped rod being fixedly connected to a baffle plate, a fixing plate fixedly connected to the bottom of the mounting plate, two second piston cylinders fixedly connected to the fixing plate, a second piston slidably connected inside the second piston cylinder, a pull rod fixedly connected to the second piston, a first spring fixed between the second piston and the second piston cylinder, the pull rod being fixedly connected to a sliding plate, and the two second piston cylinders respectively connected to the two first piston cylinders through air supply pipes.

[0010] Preferably, an electric slide rail is fixed to the bottom of the mounting plate, an electric slider is slidably connected inside the electric slide rail, and the moving plate is fixed to the bottom of the electric slider.

[0011] Preferably, the gas supply mechanism includes a plurality of third piston cylinders that penetrate and are fixedly connected to the vertical plate and are distributed in a rectangular array. A third piston is slidably connected inside the third piston cylinder. A connecting rod is fixed on the third piston. A first semicircular block is fixed on the connecting rod. A second semicircular block that mates with the first semicircular block is fixed on the outer wall of the hanging plate. A second spring is fixed between the third piston and the third piston cylinder. A fourth piston cylinder penetrates through the vertical plate and is connected to a delivery pipe. A pressure relief valve is installed on the delivery pipe. The port of the third piston cylinder is sealed and an air inlet pipe is installed on the third piston. An exhaust pipe is installed on the third piston cylinder. The plurality of exhaust pipes are connected to the air inlet pipe through a pipeline, and a first one-way valve is installed on the exhaust pipe.

[0012] Preferably, a short pipe is installed on the third piston cylinder, and a second one-way valve is installed on the short pipe.

[0013] Preferably, the first check valve allows air to flow through the third piston cylinder toward the exhaust pipe, while the second check valve only allows air to flow through the short pipe toward the third piston cylinder.

[0014] Preferably, the upper end of the hanging plate is provided with a guide groove, a movable block is slidably connected in the guide groove, the movable block is fixedly connected to the output end of the electric push rod, and a third spring is fixed between the movable block and the guide groove.

[0015] Compared with the prior art, the beneficial effects of this invention are as follows:

[0016] 1. The movement of the sliding plate drives the two levers and the second piston to move, which can transport the air in the second piston cylinder to the first piston cylinder through the air supply pipe, so that the two baffles move in opposite directions and no longer block the galvanizing box, so that the parts on the hook can be placed in the galvanizing box for galvanizing treatment; after galvanizing, the two baffles return to their original positions, reducing the loss of heat from the galvanizing liquid and minimizing the impact on the quality of the galvanized product.

[0017] 2. Under the action of the third spring, the hanging plate can be moved downward suddenly. Due to the inertia, the galvanized part and the hook do not resist each other. That is, the galvanized part is briefly suspended. There will be no problem of the metal part resisting the hook, which would result in poor galvanizing effect at the point of contact.

[0018] 3. It can achieve rapid rotation of the spiral blades, thereby concentrating and upward conveying the exhaust gas generated during galvanizing into the galvanizing box. The exhaust gas can be adsorbed and treated by activated carbon adsorption net, reducing the pollution of the exhaust gas to the air and the harm to the health of the workers.

[0019] 4. When the second semicircular block separates from the first semicircular block, the hanging plate moves upward and resets under the action of the third spring, causing the hanging plate, hook and galvanized parts to shake. This shakes off excess molten zinc from the galvanized parts, eliminating the need for manual shaking of the frame with a long rod, saving time and effort and making it safer.

[0020] 5. When the galvanized parts are taken out of the galvanizing box, the spiral blades can be rotated quickly again, so that the exhaust gas generated during the galvanizing of the metal parts can be concentrated and transported upward for treatment.

[0021] In summary, this invention features an automatically opening baffle when in use and an automatically closing baffle when not in use, reducing heat loss from the galvanizing solution and minimizing the impact on the quality of the galvanized products. It also allows for the discharge and filtration of waste gas generated during galvanizing, ensuring the effectiveness of the galvanizing process and effectively shaking the galvanized parts to remove excess molten zinc. This eliminates the need for manual shaking of the frame with a long pole, saving time and effort while ensuring greater safety. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a zinc plating device for vehicle metal parts proposed in this invention.

[0023] Figure 2 This is a schematic diagram of the structure of the galvanizing box in a galvanizing device for vehicle metal parts proposed in this invention;

[0024] Figure 3 This is a cross-sectional view of the galvanizing box in a galvanizing apparatus for vehicle metal parts proposed in this invention.

[0025] Figure 4 This is a cross-sectional view of the second piston cylinder in a galvanizing device for vehicle metal parts proposed in this invention;

[0026] Figure 5 This is a schematic diagram of a movable plate in a galvanizing device for vehicle metal parts proposed in this invention;

[0027] Figure 6 This is a cross-sectional view of the exhaust pipe in a galvanizing device for vehicle metal parts proposed in this invention;

[0028] Figure 7 This is a cross-sectional view of the third piston cylinder in a galvanizing device for vehicle metal parts proposed in this invention;

[0029] Figure 8 This is a cross-sectional view of the mounting plate in a galvanizing device for vehicle metal parts proposed in this invention.

[0030] In the diagram: 1. Support base, 2. Mounting plate, 3. Support rod, 4. Galvanized box, 5. Baffle plate, 6. Guide rail, 7. Moving plate, 8. Slider, 9. First piston cylinder, 10. Fixed plate, 11. Air supply pipe, 12. Second piston cylinder, 13. Pull rod, 14. Slide plate, 15. Push rod, 16. First piston, 17. First spring, 18. Second piston, 19. Electric slider, 20. Vertical plate, 21. Electric push rod, 22. Hanging plate, 23. Hook, 24. Third piston cylinder, 25. Exhaust pipe, 26. First one-way valve, 27. Short pipe, 28. Second one-way valve, 29. Connecting rod, 30. First semicircular block, 31. Second semicircular block, 32. Electric slide rail, 33. Fourth piston cylinder, 34. Air inlet pipe, 35. Delivery pipe, 36. Exhaust pipe, 37. Short rod, 38. Spiral blade, 39. Shaft, 40. Second spring, 41. Third piston, 42. Guide groove, 43. Third spring, 44. L-shaped rod. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figures 1-8 A galvanizing device for vehicle metal parts includes a support base 1, four support rods 3 fixed to the upper end of the support base 1, an mounting plate 2 fixed to the upper end of the four support rods 3, a galvanizing box 4 placed on the support base 1, a limiting baffle plate 5 slidably connected to the galvanizing box 4, two guide rails 6 installed on the galvanizing box 4, and sliders 8 slidably connected in both guide rails 6. Both sliders 8 are fixedly connected to the baffle plate 5, thus ensuring the stable sliding of the baffle plate 5.

[0033] Two baffles 5 are installed to cover the upper end of the galvanized box 4. A sliding plate 14 is provided on the lower side of the mounting plate 2. A drive mechanism for opening and closing the two baffles 5 is installed on the sliding plate 14. When the two baffles 5 are closed, they can cover the upper end of the galvanized box 4, thus reducing heat dissipation.

[0034] The drive mechanism is further explained as follows: The drive mechanism includes a first piston cylinder 9 fixed on the galvanized box 4. A first piston 16 is slidably connected inside the first piston cylinder 9. A push rod 15 is fixedly connected to the first piston 16. An L-shaped rod 44 is fixedly connected to the push rod 15. The L-shaped rod 44 is fixedly connected to the baffle plate 5. A fixing plate 10 is fixedly connected to the bottom of the mounting plate 2. Two second piston cylinders 12 are fixedly connected to the fixing plate 10. A second piston 18 is slidably connected inside the second piston cylinder 12. A pull rod 13 is fixedly connected to the second piston 18. A first spring 17 is fixed between the second piston 18 and the second piston cylinder 12. The pull rod 13 is fixedly connected to the slide plate 14. The two second piston cylinders 12 are respectively connected to the two first piston cylinders 9 through air supply pipes 11. The first spring 17 is used for the reset of the second piston 18.

[0035] The bottom of the mounting plate 2 is provided with a movable plate 7 that is slidably connected and is driven and cooperates with the slide plate 14. The bottom of the mounting plate 2 is fixed with an electric slide rail 32, and an electric slider 19 is slidably connected inside the electric slide rail 32. The movable plate 7 is fixed to the bottom of the electric slider 19.

[0036] Two upright plates 20 are fixed to the bottom of the movable plate 7, and two electric push rods 21 are fixed to the bottom of the movable plate 7. A hanging plate 22 is movably installed at the output end of the two electric push rods 21. A guide groove 42 is provided at the upper end of the hanging plate 22. A moving block is slidably connected in the guide groove 42. The moving block is fixedly connected to the output end of the electric push rod 21. A third spring 43 is fixed between the moving block and the guide groove 42. The upper end of the guide groove 42 is designed to be constricted, so that the moving block will not detach from the guide groove 42, and the hanging plate 22 can be more stably limited.

[0037] Multiple hooks 23 are fixed to the bottom of the hanging plate 22. An exhaust pipe 36 runs through the top and bottom of the hanging plate 22. A short rod 37 is fixed inside the exhaust pipe 36. A shaft 39 is rotatably connected to the short rod 37. Multiple spiral blades 38 are fixed to the shaft 39. Two conveying pipes 35 are installed through the exhaust pipe 36 in an alternating manner and opposite to the spiral blades 38. Activated carbon adsorption nets can be installed on the exhaust pipe 36 to adsorb harmful gases, but it is not limited to activated carbon adsorption nets; it can be other more advanced waste gas treatment equipment, etc.

[0038] Both upright plates 20 are equipped with a gas supply mechanism that supplies gas to the conveying pipe 35 to rotate the spiral blade 38. The gas supply mechanism includes multiple third piston cylinders 24 arranged in a rectangular array, passing through and fixedly connected to the upright plates 20. A third piston 41 is slidably connected inside each third piston cylinder 24. A connecting rod 29 is fixed to the third piston 41, and a first semicircular block 30 is fixed to the connecting rod 29. A second semicircular block 31, which mates with the first semicircular block 30, is fixed to the outer wall of the hanging plate 22. A second spring 40 is fixed between the third piston 41 and the third piston cylinder 24. A fourth piston cylinder 33 passes through the upright plate 20 and is connected to the conveying pipe 35. A pressure relief valve is installed on the conveying pipe 35. The piston cylinder 33 has a sealed port and an intake pipe 34 is installed on the third piston 33. An exhaust pipe 25 is installed on the third piston cylinder 24. Multiple exhaust pipes 25 are connected to the intake pipe 34 through pipes, and a first one-way valve 26 is installed on the exhaust pipe 25. A short pipe 27 is installed on the third piston cylinder 24, and a second one-way valve 28 is installed on the short pipe 27. The first one-way valve 26 allows air to flow through the third piston cylinder 24 toward the exhaust pipe 25, while the second one-way valve 28 only allows air to flow through the short pipe 27 toward the third piston cylinder 24. A second spring 40 is used for the reset of the third piston 41. The purpose of the second one-way valve 28 is to allow external air to enter the third piston cylinder 24 for reuse.

[0039] When using this invention:

[0040] The electric slider 19 moves on the electric slide rail 32 and drives the moving plate 7 to move. The moving plate 7 moves towards the galvanizing box 4. As the moving plate 7 moves, it abuts against the slide plate 14 and drives the slide plate 14 to move. The movement of the slide plate 14 drives the two pull rods 13 and the second piston 18 to move. At this time, the first spring 17 is compressed, so that the air in the second piston cylinder 12 can be transported to the first piston cylinder 9 through the air supply pipe 11. The pressure in the first piston cylinder 9 increases, driving the first piston 16, push rod 15, L-shaped rod 44 and baffle plate 5 to move, thereby realizing that the two baffle plates 5 move in opposite directions and no longer block the galvanizing box 4. In this way, the parts on the hook 23 can be placed in the galvanizing box 4 for galvanizing treatment.

[0041] When the electric push rod 21 is activated, it causes the hanging plate 22 and the second semicircular block 31 to move downwards. The second semicircular block 31 abuts against the first semicircular block 30, thus limiting the hanging plate 22. As the electric push rod 21 moves downwards, the third spring 43 is compressed and contracted. Finally, the second semicircular block 31 compresses the first semicircular block 30 and moves it. This allows the hanging plate 22 and the second semicircular block 31 to move downwards, so that the workpiece can be placed in the galvanizing box 4 to perform the galvanizing process.

[0042] As the electric push rod 21 moves down, the third spring 43 is compressed and contracted. When the second semicircular block 31 pushes the first semicircular block 30 to move without contacting the first semicircular block 30, the hanging plate 22 can suddenly move downward under the action of the third spring 43. Due to the inertia, the galvanized part and the hook 23 do not contact each other, that is, the galvanized part is temporarily suspended. There will be no problem that the metal part and the hook 23 will contact each other, resulting in poor galvanizing effect at the contact point.

[0043] Simultaneously, the first semicircular block 30 is squeezed and moved, driving the third piston 41 to move. The movement of the third piston 41 can squeeze and transport the air in the third piston cylinder 24 to the fourth piston cylinder 33 through the exhaust pipe 25. Since the air in multiple third piston cylinders 24 is transported to the fourth piston cylinder 33, the pressure in the fourth piston cylinder 33 increases rapidly and exceeds the threshold of the pressure relief valve. Therefore, the pressurized air is quickly discharged through the conveying pipe 35 and blown onto the spiral blade 38. The conveying pipes 35 on both sides are staggered and blow onto the spiral blade 38, thus realizing the rapid rotation of the spiral blade 38. This allows the waste gas generated during the galvanizing of metal parts placed in the galvanizing box 4 to be concentrated and transported upward. It can be adsorbed and treated by the activated carbon adsorption net, reducing the pollution of the waste gas to the air and the damage to the workers' bodies.

[0044] After galvanizing, the electric push rod 21 is activated to move its output end upward, and the first semicircular block 30 abuts against the second semicircular block 31. The output end of the electric push rod 21 continues to move upward, at which point the third spring 43 is stretched. The second semicircular block 31 abuts against the first semicircular block 30, causing the first semicircular block 30 to move. When the second semicircular block 31 separates from the first semicircular block 30, the hanging plate 22 is moved upward and reset under the action of the third spring 43, realizing the shaking of the hanging plate 22, hook 23 and galvanized parts. This shakes off excess zinc liquid on the galvanized parts, eliminating the need for manual shaking of the frame with a long rod to shake off the zinc liquid, saving time and effort and making it safer.

[0045] After galvanizing is completed, the electric slider 19 drives the moving plate 7 to reset. At this time, the sliding plate 14 is no longer limited. Under the action of the first spring 17, the second piston 18, the pull rod 13 and the sliding plate 14 can be reset. The air in the first piston cylinder 9 can be extracted. The two baffle plates 5 can move relative to each other and reset. The galvanizing box 4 can be shielded to reduce the heat loss of the galvanizing liquid and reduce the impact on the quality of the galvanized product.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for galvanizing metal pieces of a vehicle, comprising a support seat (1), characterized in that, Four support rods (3) are fixed to the upper end of the support base (1), and an mounting plate (2) is fixed to the upper end of the four support rods (3). A galvanized box (4) is placed on the support base (1), and a limiting baffle plate (5) is slidably connected to the galvanized box (4). The two baffle plates (5) cover the upper end of the galvanized box (4). A sliding plate (14) is provided on the lower side of the mounting plate (2), and a driving mechanism for opening and closing the two baffle plates (5) is installed on the sliding plate (14). A movable plate (7) that is driven and cooperates with the sliding plate (14) is slidably connected to the bottom of the mounting plate (2). Two upright plates (20) are fixed to the bottom of the movable plate (7), and two electric push rods are fixed to the bottom of the movable plate (7). (21) The output ends of the two electric push rods (21) are movably mounted with a hanging plate (22). The bottom of the hanging plate (22) is fixed with multiple hooks (23). The hanging plate (22) is provided with an exhaust pipe (36) running through it from top to bottom. An activated carbon adsorption net is installed at the upper end of the exhaust pipe (36). A short rod (37) is fixed inside the exhaust pipe (36). A shaft (39) is rotatably connected to the short rod (37). Multiple spiral blades (38) are fixed on the shaft (39). Two conveying pipes (35) are installed through the exhaust pipe (36) in an alternating manner and opposite to the spiral blades (38). Both of the two vertical plates (20) are equipped with a gas supply mechanism that supplies gas to the conveying pipes (35) to blow the spiral blades (38) to rotate.

2. A device for galvanizing metal parts of a vehicle according to claim 1, characterized in that, Two guide rails (6) are installed on the galvanized box (4), and sliders (8) are slidably connected in both guide rails (6). Both sliders (8) are fixedly connected to the baffle plate (5).

3. A device for galvanizing metal parts of a vehicle according to claim 1, characterized in that, The driving mechanism includes a first piston cylinder (9) fixed on a galvanized box (4), a first piston (16) slidably connected inside the first piston cylinder (9), a push rod (15) fixedly connected to the first piston (16), an L-shaped rod (44) fixedly connected to the push rod (15), the L-shaped rod (44) fixedly connected to the baffle plate (5), a fixing plate (10) fixedly connected to the bottom of the mounting plate (2), two second piston cylinders (12) fixedly connected to the fixing plate (10), a second piston (18) slidably connected inside the second piston cylinder (12), a pull rod (13) fixedly connected to the second piston (18), a first spring (17) fixed between the second piston (18) and the second piston cylinder (12), the pull rod (13) fixedly connected to the slide plate (14), and the two second piston cylinders (12) respectively connected to the two first piston cylinders (9) through an air supply pipe (11).

4. A device for galvanizing metal parts of a vehicle according to claim 1, characterized in that, An electric slide rail (32) is fixed to the bottom of the mounting plate (2), and an electric slider (19) is slidably connected inside the electric slide rail (32). The moving plate (7) is fixed to the bottom of the electric slider (19).

5. A zinc plating apparatus for vehicle metal parts according to claim 1, characterized in that, The gas supply mechanism includes multiple third piston cylinders (24) that penetrate and are fixedly connected to the vertical plate (20) and are arranged in a rectangular array. A third piston (41) is slidably connected inside the third piston cylinder (24). A connecting rod (29) is fixed on the third piston (41). A first semicircular block (30) is fixed on the connecting rod (29). A second semicircular block (31) that cooperates with the first semicircular block (30) is fixed on the outer wall of the hanging plate (22). A second spring is fixed between the third piston (41) and the third piston cylinder (24). 40) A fourth piston cylinder (33) is provided through the vertical plate (20). The fourth piston cylinder (33) is connected to the conveying pipe (35). A pressure relief valve is installed on the conveying pipe (35). The port of the third piston cylinder (33) is sealed and an air inlet pipe (34) is installed on the third piston (33). An exhaust pipe (25) is installed on the third piston cylinder (24). Multiple exhaust pipes (25) are connected to the air inlet pipe (34) through pipes. A first one-way valve (26) is installed on the exhaust pipe (25).

6. A zinc plating apparatus for vehicle metal parts according to claim 5, characterized in that, A short pipe (27) is installed on the third piston cylinder (24), and a second one-way valve (28) is installed on the short pipe (27).

7. A zinc plating apparatus for vehicle metal parts according to claim 6, characterized in that, The first check valve (26) allows air to flow through the third piston cylinder (24) toward the exhaust pipe (25), while the second check valve (28) only allows air to flow through the short pipe (27) toward the third piston cylinder (24).

8. A zinc plating apparatus for vehicle metal parts according to claim 1, characterized in that, The upper end of the hanging plate (22) is provided with a guide groove (42), and a moving block is slidably connected in the guide groove (42). The moving block is fixedly connected to the output end of the electric push rod (21), and a third spring (43) is fixed between the moving block and the guide groove (42).

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