Turnover structure for friction stir welding

Abstract

The invention discloses a turnover structure for friction stir welding, which relates to the technical field of friction stir welding, and comprises a rack positioned beside friction stir welding equipment, two oppositely arranged mounting boxes are fixed on the rack, each mounting box is rotatably connected with a radial connecting shaft, and the two connecting shafts are oppositely arranged; according to the friction stir welding device with the turnover function, the two clamping plates are fixedly connected with the battery frame bottom plate through the action of the connecting pieces, the battery frame bottom plate is controlled to turn over through the action of the control piece, the battery frame bottom plate does not need to be turned over manually, manpower is saved, and the welding efficiency is improved. The possibility that workpieces are collided and scratched due to manual overturning of the battery frame bottom plate and the welding efficiency of the workpieces is reduced is reduced, and the mounting box is supported through the action of the rack.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, in particular to a reversible structure for friction stir welding. Background Art

[0002] Friction stir welding is an innovative and advanced friction welding technology. Like conventional friction welding, friction stir welding also uses friction heat and plastic deformation heat as welding heat sources. The difference is that the friction stir welding process is that a cylindrical or other shaped stirring needle is inserted into the joint of the workpiece, and the high-speed rotation of the welding head causes it to rub against the welding workpiece material, thereby increasing the temperature of the material at the connection part and softening it, thus completing the purpose of material welding.

[0003] The advantage of friction stir welding is that it can realize the connection and manufacturing of solid-phase materials, and it has the characteristics of high efficiency, low consumption and low cost. It has broad application prospects in aviation, aerospace, automobile, shipbuilding, rail transit, civil aviation, electric power, electronics, metallurgy and other industries. In new energy vehicles, the cruising range of new energy vehicles mainly depends on new energy battery packs. The battery pack is the core energy source of new energy vehicles and provides driving power for the whole vehicle. It mainly includes battery cells, modules, electrical systems, thermal management systems, shells and BMS (battery management system). Among them, the battery pack shell, as the carrier of the battery module, plays a key role in the safe operation and protection of the battery module.

[0004] The battery pack shell used in new energy vehicles must meet the design requirements and rigidity requirements of the protection level of the electrical equipment shell and provide collision protection. Therefore, the battery pack shell is required to have good quality, high strength and good fatigue resistance. The strength of the battery pack shell is reflected in the connection method. The commonly used connection methods are arc welding (TIG welding, MIG welding, CMT welding, drawn arc welding), stir friction welding, FDS riveting, etc. Among them, stir friction welding accounts for more than 50% of the battery pack shell manufacturing due to its high strength and strong applicability of the finished product after welding. It is mainly used in the connection of the bottom plate and the assembly of the bottom plate side beams.

[0005] The existing friction stir welding tooling fixes the battery frame bottom plate on the welding tooling platform through a welding clamping device. After the front welding is completed, the battery frame bottom plate needs to be manually flipped for back welding. The flipping of the battery frame bottom plate is usually done manually, which is time-consuming and labor-intensive, and is also prone to scratching the workpiece, reducing the welding efficiency and welding quality of the workpiece. Summary of the invention

[0006] (1) Technical problems solved In view of the shortcomings of the prior art, the present invention provides a reversible structure for stir friction welding, which solves the problem that when the battery frame bottom plate of the existing stir friction welding device needs to be flipped for welding, manual flipping is usually adopted. This flipping method is time-consuming and labor-intensive, and it is easy to scratch the workpiece, thereby reducing the welding efficiency and welding quality of the workpiece. (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a reversible structure for stir friction welding, comprising a frame located beside the stir friction welding equipment, two relatively arranged mounting boxes are fixed on the frame, each mounting box is rotatably connected with a radial connecting shaft, the two connecting shafts are relatively arranged, each connecting shaft is fixed with a clamping plate, the clamping plate is detachably fixedly connected with the battery frame bottom plate through a connecting member, and a control member for driving the connecting shaft and the clamping plate to rotate to drive the battery frame bottom plate to flip is provided in the mounting box. Through the above-mentioned technical solution, the two clamping plates are fixedly connected with the battery frame bottom plate through the action of the connecting member, and the flipping of the battery frame bottom plate is controlled by the action of the control member, and there is no need to manually flip the battery frame bottom plate, which saves manpower, reduces the possibility of scratching the workpiece due to manual flipping of the battery frame bottom plate, and reduces the welding efficiency of the workpiece, and the mounting box is supported by the action of the frame.

[0008] Preferably, the inner cavity of the installation box is hollow, the end of the connecting shaft away from the clamping plate extends to the inner cavity of the installation box and is rotatably connected to the installation box, the control member includes an A synchronous wheel nested in the portion of the connecting shaft extending to the inner cavity of the installation box, the A synchronous wheel is fixedly connected to the connecting shaft, the frame is fixed with an A motor, the output shaft end of the A motor extends to the inner cavity of the installation box, the portion of the A motor output shaft end extending to the inner cavity of the installation box is nested with a B synchronous wheel, the B synchronous wheel is fixedly connected to the output shaft of the A motor and is coaxially arranged, and the A synchronous wheel and the B synchronous wheel are provided with a synchronous belt that cooperates with the A synchronous wheel and the B synchronous wheel. Through the above technical solution, the A motor provides power for the rotation of the B synchronous wheel, and the transmission effect of the B synchronous wheel, the A synchronous wheel and the synchronous belt is used to drive the connecting shaft to rotate, the rotation of the connecting shaft will drive the clamping plate fixedly connected to the connecting shaft to rotate, and the rotation of the clamping plate will drive the bottom plate of the battery frame fixedly connected to the clamping plate to flip.

[0009] Preferably, a tensioning wheel located in the synchronous belt and having a tensioning effect on the synchronous belt is rotatably connected in the installation box.

[0010] Through the above technical solution, the synchronous belt is tensioned by the tensioning wheel, thereby increasing the service life of the synchronous belt.

[0011] Preferably, the connecting member includes a plurality of evenly arranged A columnar holes opened on the clamping plate, the lower surface of the battery frame bottom plate is provided with a side plate integrally formed with the battery frame bottom plate, the side plate is provided with B columnar holes A that match and correspond one to one with the columnar holes, and the clamping plate and the side plate are fixedly connected by bolts passing through the A columnar holes and the B columnar holes.

[0012] Through the above technical solution, the bolt includes a screw and a nut. The screw passes through the clamping plate and the side plate through the cylindrical hole A and the cylindrical hole B in turn, and then the nut is threadedly sleeved on the outside of the screw. The bolt facilitates the fixed connection between the clamping plate and the side plate, and then facilitates the fixed connection between the clamping plate and the battery frame bottom plate, thereby improving the stability of the connection between the clamping plate and the battery frame bottom plate.

[0013] Preferably, anti-slip blocks are fixed at both ends of the clamping plate, the anti-slip blocks and the clamping plate are fixedly connected by screws, the battery frame bottom plate is located between two adjacent anti-slip blocks and abuts against the adjacent anti-slip blocks, and anti-slip strips are provided on the clamping plate and the anti-slip blocks.

[0014] Through the above technical solution, the position of the anti-slip block is adjusted according to the size of the battery frame bottom plate, so that two adjacent anti-slip blocks play a clamping role on the battery frame bottom plate. After the position of the anti-slip block is determined, the anti-slip block and the clamping plate are fixedly connected by screws. Preferably, a fixing box is fixed on the frame, the inner cavity of the fixing box is hollow, and two through holes are provided on the upper surface of the fixing box. Two columns are slidably connected to the inner cavity of the installation box, and each of the columns passes through the fixing box through the through hole. The parts of the two columns passing through the fixing box are fixed with an operating table that supports the battery frame bottom plate, and a driving member for controlling the movement of the operating table box columns in the vertical direction is provided in the fixing box.

[0015] Through the above technical solution, when the battery frame bottom plate does not need to be flipped, the operating table moves to contact with the lower surface of the battery frame bottom plate and supports the battery frame bottom plate. When the battery frame bottom plate needs to be flipped, the column and the operating table are controlled to move downward through the action of the driving member, and the downward movement of the operating table does not affect the flipping of the battery frame bottom plate.

[0016] Preferably, the driving member includes a screw rod arranged in the inner cavity of the fixed box and axially arranged, both ends of the screw rod are rotatably connected to the groove wall of the inner cavity of the fixed box, a moving block is provided on the outside of the screw rod through a threaded sleeve, the column is fixed to the moving block, a slide rail is fixed on the groove wall of the fixed box, a slider is slidably connected to the slide rail, the side of the slider facing away from the slide rail is fixedly connected to the moving block, and a B motor for driving the screw rod to rotate is fixed on the fixed box.

[0017] Through the above technical solution, the B motor provides power for the rotation of the screw. Through the cooperation of the screw and the moving block, the rotation of the screw will drive the moving block and the column fixedly connected to the moving block to move in the vertical direction. The movement of the moving block is guided by the action of the slide rail and the slider.

[0018] (3) Beneficial effects The present invention provides a reversible structure for stir friction welding, which has the following beneficial effects: 1) The friction stir welding device with flipping function is used to fix the two clamping plates with the battery frame bottom plate through the action of the connecting member, and the flipping of the battery frame bottom plate is controlled by the action of the control member, so that there is no need to manually flip the battery frame bottom plate, which saves manpower and reduces the possibility of scratching the workpiece due to manual flipping of the battery frame bottom plate, thereby reducing the welding efficiency of the workpiece, and the mounting box is supported by the action of the frame; 2) For the friction stir welding device with a flipping function, when the battery frame bottom plate does not need to be flipped, the operating table moves to contact with the lower surface of the battery frame bottom plate and supports the battery frame bottom plate, so as to facilitate friction stir welding of the battery frame bottom plate. When the battery frame bottom plate needs to be flipped, the column and the operating table are controlled to move downward through the action of the driving member, and the downward movement of the operating table does not affect the flipping of the battery frame bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall top view structure of the present invention; Figure 3 This is a schematic diagram of the structure of the A synchronous wheel used to embody the present invention; Figure 4 This is a schematic diagram of the structure of the fixing box used to embody the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at A in the middle.

[0020] In the figure: 1. Friction stir welding equipment; 2. Frame; 3. Mounting box; 4. Connecting shaft; 5. Clamping plate; 6. Battery frame bottom plate; 7. A synchronous wheel; 8. B synchronous wheel; 9. Anti-slip block; 10. Fixing box; 11. Column; 12. Operating table; 13. Screw; 14. Moving block; 15. Slide rail; 16. Slider; 17. Motor B. DETAILED DESCRIPTION The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-5 As shown, the present invention provides a technical solution: a reversible structure for stir friction welding, comprising a frame 2 located beside a stir friction welding device 1, two relatively arranged mounting boxes 3 are fixed on the frame 2, each mounting box 3 is rotatably connected with a radial connecting shaft 4, the two connecting shafts 4 are relatively arranged, and a clamping plate 5 is fixed on each connecting shaft 4, the clamping plate 5 is detachably fixedly connected to a battery frame bottom plate 6 through a connecting piece, a control member driving the connecting shaft 4 and the clamping plate 5 to rotate so as to drive the battery frame bottom plate 6 to flip is provided in the mounting box 3, the two clamping plates 5 are fixedly connected to the battery frame bottom plate 6 through the action of the connecting member, the battery frame bottom plate 6 is flipped by the action of the control member, and there is no need to manually flip the battery frame bottom plate 6, thereby saving manpower, reducing the possibility of scratching the workpiece due to manual flipping of the battery frame bottom plate 6, and reducing the welding efficiency of the workpiece, and the mounting box 3 is supported by the action of the frame 2.

[0022] like Figure 3 The inner cavity of the installation box 3 is hollow, and one end of the connecting shaft 4 away from the clamping plate 5 extends to the inner cavity of the installation box 3 and is rotatably connected to the installation box 3. The control component includes an A synchronous wheel 7 nested in the portion of the connecting shaft 4 extending to the inner cavity of the installation box 3. The A synchronous wheel 7 is fixedly connected to the connecting shaft 4. The frame 2 is fixed with an A motor. The output shaft end of the A motor extends to the inner cavity of the installation box 3. The portion of the output shaft end of the A motor extending to the inner cavity of the installation box 3 is nested with a B synchronous wheel 8. The B synchronous wheel 8 is fixedly connected to the output shaft of the A motor and is coaxially arranged. The A synchronous wheel 7 and the B synchronous wheel 8 are provided with a synchronous belt that cooperates with the A synchronous wheel 7 and the B synchronous wheel 8. The A motor provides power for the rotation of the B synchronous wheel 8. The transmission effect of the B synchronous wheel 8, the A synchronous wheel 7 and the synchronous belt is used to drive the connecting shaft 4 to rotate. The rotation of the connecting shaft 4 will drive the clamping plate 5 fixedly connected to the connecting shaft 4 to rotate. The rotation of the clamping plate 5 will drive the battery frame bottom plate 6 fixedly connected to the clamping plate 5 to flip. Figure 3 In order to reduce the possibility of the synchronous belt loosening after a long period of use, a tensioning wheel located in the synchronous belt and having a tensioning effect on the synchronous belt is rotatably connected in the installation box 3. The tensioning wheel tensions the synchronous belt, thereby increasing the service life of the synchronous belt.

[0023] like Figure 1The connecting piece includes a plurality of evenly arranged A column holes formed on the clamping plate 5. The lower surface of the battery frame bottom plate 6 is provided with a side plate integrally formed with the battery frame bottom plate 6. The side plate is provided with A column holes that match and correspond to the column holes. The clamping plate 5 and the side plate are fixedly connected by bolts that penetrate the A column holes and the B column holes. The bolts include screws and nuts. The screws penetrate the clamping plate 5 and the side plate through the A column holes and the B column holes in turn. Then the nuts are threadedly sleeved on the screws. The bolts facilitate the fixed connection between the clamping plate 5 and the side plate, thereby facilitating the fixed connection between the clamping plate 5 and the battery frame bottom plate 6, thereby improving the stability of the connection between the clamping plate 5 and the battery frame bottom plate 6.

[0024] like Figure 1 and Figure 2 and Figure 3 and Figure 4 , anti-dropping blocks 9 are fixed at both ends of the clamping plate 5, and the anti-dropping blocks 9 and the clamping plate 5 are fixedly connected by screws. The battery frame bottom plate 6 is located between two adjacent anti-dropping blocks 9 and contacts the adjacent anti-dropping blocks 9. Anti-slip strips are provided on the clamping plate 5 and the anti-dropping blocks 9. According to the size of the battery frame bottom plate 6, the position of the anti-dropping blocks 9 is adjusted so that the two adjacent anti-dropping blocks 9 can clamp the battery frame bottom plate 6. After the position of the anti-dropping blocks 9 is determined, the anti-dropping blocks 9 and the clamping plate 5 are fixedly connected by screws. Figure 3 and Figure 4 and Figure 5 The battery frame bottom plate 6 cannot remain stable without support during the stir friction welding process. In order to improve the stability of the battery frame bottom plate 6 during the stir friction welding process, a fixing box 10 is fixed on the frame 2. The inner cavity of the fixing box 10 is hollow, and two through holes are provided on the upper surface of the fixing box 10. The inner cavity of the mounting box 3 is slidably connected to two columns 11, and each column 11 passes through the fixing box 10 through the through hole. The part where the two columns 11 pass through the fixing box 10 is fixed with an operating table 12 that supports the battery frame bottom plate 6. A driving member for controlling the operating table 12 and the column 11 to move in the vertical direction is provided in the fixing box 10. When the battery frame bottom plate 6 does not need to be flipped, the operating table 12 moves to contact with the lower surface of the battery frame bottom plate 6 and supports the battery frame bottom plate 6. When the battery frame bottom plate 6 needs to be flipped, the column 11 and the operating table 12 are controlled to move downward through the action of the driving member, and the downward movement of the operating table 12 does not affect the flipping of the battery frame bottom plate 6.

[0025] like Figure 5The driving member includes a screw 13 which is arranged in the inner cavity of the fixed box 10 and is axially arranged. Both ends of the screw 13 are rotatably connected to the inner cavity groove wall of the fixed box 10. A moving block 14 is provided on the outside of the screw 13 through a threaded sleeve. The column 11 is fixed to the moving block 14. A slide rail 15 is fixed to the groove wall of the fixed box 10. A slider 16 is slidably connected to the slide rail 15. The side of the slider 16 facing away from the slide rail 15 is fixedly connected to the moving block 14. A B motor 17 for driving the screw 13 to rotate is fixed to the fixed box 10. The rotation of the screw 13 is powered by the action of the B motor 17. Through the cooperation of the screw 13 and the moving block 14, the rotation of the screw 13 will drive the moving block 14 and the column 11 fixedly connected to the moving block 14 to move in the vertical direction. The movement of the moving block 14 is guided by the action of the slide rail 15 and the slider 16.

[0026] When in use, turn on the power, turn on the switch, and the user places the battery frame bottom plate 6 between the two clamping plates 5, and then fixes the clamping plate 5 and the side plate on the battery frame bottom plate 6 with a plurality of screws. Since the side plate and the battery frame bottom plate 6 are an integrated structure, the clamping plate 5 is fixedly connected to the battery frame bottom plate 6; then four anti-detachment blocks 9 are placed at the four end corners of the battery frame bottom plate 6 and fixed to the clamping plate 5 with bolts, and every two adjacent anti-detachment blocks 9 clamp the battery frame bottom plate 6, further improving the stability of the connection between the clamping plate 5 and the battery frame bottom plate 6; Then, turn on the B motor 17, and the screw 13 is driven to rotate through the action of the B motor 17. The screw 13 and the moving block 14 are rotatably connected. The rotation of the screw 13 will drive the moving block 14 to move in the vertical direction. The movement of the moving block 14 will drive the column 11 fixedly connected to the moving block 14 to move in the vertical direction. The movement of the column 11 will drive the operating table 12 fixedly connected to the column 11 to move in the vertical direction. The cooperation of the slide rail 15 and the slider 16 guides the movement of the moving block 14 until the operating table 12 moves to the bottom of the battery frame bottom plate 6 and contacts the lower surface of the battery frame bottom plate 6. The operating table 12 supports the battery frame bottom plate 6. At this time, the battery frame bottom plate 6 is subjected to friction stir welding by the friction stir welding device 1. When it is necessary to flip the battery frame bottom plate 6, the screw 13 is driven to reverse through the action of the B motor 17, thereby driving the moving block 14, the column 11 and the operating table 12 to move up and down in the vertical direction until the operating table 12 does not affect the flipping of the battery frame bottom plate 6; the staff turns on the A motor, and the A motor drives the B synchronous wheel 8 fixedly connected to the output shaft of the A motor to rotate, and the rotation of the B synchronous wheel 8 will drive the synchronous belt matched with the B synchronous wheel 8 to rotate, and the rotation of the synchronous belt will drive the A synchronous wheel 7 matched with the synchronous belt to rotate, and then drive the connecting shaft 4 fixedly connected to the A synchronous wheel 7 to rotate, and the rotation of the connecting shaft 4 will drive the clamping plate 5 fixedly connected to the connecting shaft 4 to rotate, and then drive the battery frame bottom plate 6 fixedly connected to the clamping plate 5 to flip; After the battery frame bottom plate 6 is flipped, the screw 13 is driven to rotate again by the action of the B motor 17, thereby driving the moving block 14, the column 11 and the operating table 12 to move in the vertical direction, until the operating table 12 moves to the bottom of the battery frame bottom plate 6 and conflicts with the lower surface of the battery frame bottom plate 6, and the battery frame bottom plate 6 is supported by the action of the operating table 12. This is the use process of the stir friction welding device with flipping function. At the same time, the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reversible structure for friction stir welding, comprising a frame (2) located beside a friction stir welding device (1), characterized in that: Two installation boxes (3) arranged opposite to each other are fixed on the frame (2), each of the installation boxes (3) is rotatably connected to a radial connecting shaft (4), the two connecting shafts (4) are arranged opposite to each other, each of the connecting shafts (4) is fixed with a clamping plate (5), the clamping plate (5) is detachably fixedly connected to the battery frame bottom plate (6) through a connecting piece, and a control piece for driving the connecting shaft (4) and the clamping plate (5) to rotate so as to drive the battery frame bottom plate (6) to flip is provided in the installation box (3).

2. The reversible structure for friction stir welding according to claim 1, characterized in that: The inner cavity of the installation box (3) is hollow, one end of the connecting shaft (4) away from the clamping plate (5) extends into the inner cavity of the installation box (3) and is rotatably connected to the installation box (3), the control component comprises an A synchronous wheel (7) nested in the portion of the connecting shaft (4) extending into the inner cavity of the installation box (3), the A synchronous wheel (7) being fixedly connected to the connecting shaft (4), an A motor being fixed on the frame (2), the output shaft end of the A motor extending into the inner cavity of the installation box (3), the portion of the A motor output shaft end extending into the inner cavity of the installation box (3) being nested with a B synchronous wheel (8), the B synchronous wheel (8) being fixedly connected to the output shaft of the A motor and being coaxially arranged, the A synchronous wheel (7) and the B synchronous wheel (8) being provided with a synchronous belt cooperating with the A synchronous wheel (7) and the B synchronous wheel (8) on their outer sleeves.

3. A reversible structure for friction stir welding according to claim 2, characterized in that: A tensioning wheel located in the synchronous belt and having a tensioning effect on the synchronous belt is rotatably connected in the installation box (3).

4. The reversible structure for friction stir welding according to claim 1, characterized in that: The connecting member comprises a plurality of evenly arranged A columnar holes formed on the clamping plate (5); the lower surface of the battery frame bottom plate (6) is provided with a side plate integrally formed with the battery frame bottom plate (6); the side plate is provided with B columnar holes that match the A columnar holes and correspond one to one; the clamping plate (5) and the side plate are fixedly connected by bolts penetrating the A columnar holes and the B columnar holes.

5. The reversible structure for friction stir welding according to claim 1, characterized in that: Anti-slip blocks (9) are fixed to both ends of the clamping plate (5); the anti-slip blocks (9) and the clamping plate (5) are fixedly connected by screws; the battery frame bottom plate (6) is located between two adjacent anti-slip blocks (9) and contacts the adjacent anti-slip blocks (9); and anti-slip strips are provided on the clamping plate (5) and the anti-slip blocks (9).

6. The reversible structure for friction stir welding according to claim 1, characterized in that: A fixing box (10) is fixed on the frame (2), the inner cavity of the fixing box (10) is hollow, and two through holes are formed on the upper surface of the fixing box (10). The inner cavity of the installation box (3) is slidably connected to two columns (11), and each of the columns (11) passes through the fixing box (10) through a through hole. An operating table (12) that supports the battery frame bottom plate (6) is fixed to the parts of the two columns (11) that pass through the fixing box (10). A driving member that controls the operating table (12) and the columns (11) to move in the vertical direction is provided in the fixing box (10).

7. The reversible structure for friction stir welding according to claim 6, characterized in that: The driving member comprises a screw rod (13) arranged in the inner cavity of the fixed box (10) and arranged axially, the two ends of the screw rod (13) being rotatably connected to the inner cavity groove wall of the fixed box (10), a moving block (14) being provided on the outside of the screw rod (13) through a threaded sleeve, the column (11) being fixed to the moving block (14), a slide rail (15) being fixed to the groove wall of the fixed box (10), a slider (16) being slidably connected to the slide rail (15), a side of the slider (16) facing away from the slide rail (15) being fixedly connected to the moving block (14), and a B motor (17) for driving the screw rod (13) to rotate being fixed to the fixed box (10).

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