A five-axis linkage rear stop mechanism for a bending machine
By designing a five-axis linkage rear material mechanism, multiple moving parts are used to drive the movement of the slide, carriage and slide platform, multi-dimensional adjustment and misalignment of the supporting plate, solving the problem of the existing bending machine backshift material mechanism adapting to a single type of workpiece, and achieving flexible bending of a variety of workpieces.
Patent Information
- Application Number
- CN202420774184.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-04-15
AI Technical Summary
The supporting plates of the backstop material mechanism of the existing bending machine meet a single type of workpiece, and it is difficult to adapt to the bending needs of multiple workpieces.
A five-axis linkage rear material mechanism is designed to drive the slide plate horizontally through the first moving piece, the second moving piece drives the carriage vertically, and the third moving piece drives the slide platform and the telescopic platform to move horizontally, realizing multi-dimensional adjustment and dislocation of the supporting material plate, and adapting to the bending of various workpieces.
It realizes flexible adjustment and dislocation of the supporting plate, can adapt to the bending needs of a variety of workpieces, and is simple and convenient to use.
Smart Images

Figure CN222695701U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bending machines, in particular to a five-axis linkage rear stopper mechanism for bending machines. Background Art
[0002] A bending machine is a machine that can bend plates. Its function is to press steel plates into parts of various shapes according to process requirements. A back gauge is required when using a bending machine. The back gauge is an important working mechanism of the bending machine. The support plate installed on it is a necessary component for positioning the workpiece plate and ensuring the contour accuracy of the workpiece.
[0003] However, the support plates in the rear stopper mechanism currently on the market are only suitable for a single type of workpieces, so there is an urgent need for a rear stopper mechanism for a bending machine that can adapt to a variety of workpiece types. Summary of the invention
[0004] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a five-axis linkage rear stopper mechanism for a bending machine, which has the advantage of being adaptable to various types of workpieces.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0006] The utility model provides a five-axis linkage rear stopper mechanism for a bending machine, comprising a base connected to a frame of the bending machine and a bottom plate detachably connected to the top of the base;
[0007] The bottom plate is horizontally connected to an inverted U-shaped slide plate through a first moving member in a direction close to or away from the bending machine, and the slide plate is vertically connected to a slide rack through a second moving member, and the top of the slide rack is horizontally connected to a slide table and a telescopic table through a third moving member;
[0008] The sliding table and the telescopic table are both provided with supporting plates.
[0009] By adopting the above technical scheme, the slide plate is driven by the first moving member to move horizontally toward or away from the bending machine. At this time, the slide, the slide table, the telescopic table and the support plate will move with the slide plate. At this time, the distance between the support plate and the bending machine can be adjusted. The slide plate is driven by the second moving member to move vertically upward or downward, thereby adjusting the height position of the support plate. The slide table and the telescopic table are driven by the third moving member to move horizontally independently, thereby adjusting the position of the support plate. The two support plates can be dislocated by extending and retracting the telescopic table. By adjusting the two support plates through the above process, it can adapt to the bending of various types of workpiece sheets (such as conical workpiece bending, angular workpiece bending, double-piece double-positioning bending, etc.), which is simple and convenient to use.
[0010] Preferably, the first moving member includes two first slide rails horizontally arranged on the bottom plate along the length direction of the bottom plate, and one end of the bottom plate and the two first slide rails pass through the slide plate, and the slide plate is horizontally slidably connected to the two first slide rails, and the top of the bottom plate is provided with two opposite vertical plates, and a first screw rod is rotatably connected between the two vertical plates, and the first push plate is detachably connected to the slide plate, and the first push plate is located between the two vertical plates, one end of the first screw rod passes through the first push plate and is threadedly connected to the first push plate, one end of the first screw rod is coaxially provided with a first transmission shaft, and the end of the first transmission shaft away from the first screw rod passes through one of the vertical plates and is provided with a first pulley, a mounting plate is provided on the bottom plate, and a first motor is provided on one side of the mounting plate, one end of the rotating shaft of the first motor passes through the mounting plate and is provided with a second pulley, and the first pulley and the second pulley are connected by a first transmission belt.
[0011] Preferably, the slide comprises a cross plate and two opposite vertical plates, the cross plate is horizontally arranged at the top ends of the two vertical plates, the second moving member comprises two second slide rails, and the two second slide rails are respectively vertically slidably connected to the two sides of the slide plate away from each other, the two second slide rails are respectively vertically arranged on the two vertical plates, the slide plate is provided with two opposite second push plates, and the two second push plates are respectively close to the two vertical plates, the two vertical plates are provided with a horizontal plate located above the second push plates on one side close to the second push plates, and the bottom ends of the two horizontal plates are rotatably connected to the second screw rods, and the two second screw rods The bottom ends of the rods pass through the two second push plates and are threadedly connected thereto, the top ends of the two second screw rods are coaxially provided with a second transmission shaft, and the top ends of the two second transmission shafts pass through the horizontal plate located above and are provided with a third pulley, a support plate is provided on one side of the horizontal plate, and a second motor is provided on the support plate, one end of the rotating shaft of the second motor passes through the support plate and is provided with a fourth pulley located below the support plate, the fourth pulley is connected to the two third pulleys through a second transmission belt, and the slide table and the telescopic table are horizontally slidably connected to the top end of the horizontal plate through a third movable member.
[0012] Preferably, a first belt tensioning wheel for pressing the first transmission belt is provided on the mounting plate, and a second belt tensioning wheel for pressing the second transmission belt is provided on the supporting plate.
[0013] Preferably, the third moving member includes a third slide rail and a rack arranged at the top of the horizontal plate along the length direction of the horizontal plate, the third slide rail and the rack are arranged side by side, the slide table and the telescopic table are horizontally slidably connected to the third slide rail, and a suspension plate is provided on one side of the slide table and the telescopic table, and a third motor is provided at the top of the two suspension plates, one end of the rotating shaft of the two third motors passes through the suspension plate and is provided with a gear located below the suspension plate, and the two gears are meshed with the rack.
[0014] Preferably, the telescopic table includes a slide and a moving seat, the slide is horizontally slidably connected to the third slide rail, and the top of the slide is horizontally provided with a fourth slide rail, the moving seat is horizontally slidably connected to the fourth slide rail, the supporting plate on the telescopic table is arranged on one side of the moving seat, the moving seat slides on the fourth slide rail along the width direction of the cross plate, the top of the slide is provided with a side plate, and the side plate is located on one side of the fourth slide rail, one side of the side plate is rotatably connected with a third screw rod, the moving seat is provided with a third push plate located on one side of the side plate, one end of the third screw rod passes through the third push plate and is threadedly connected to the third push plate, and the slide is provided with a fourth motor for driving the third screw rod to rotate.
[0015] The beneficial effects of the utility model are as follows: the slide plate is driven by the first movable member to move horizontally in the direction of approaching or moving away from the bending machine, and the slide, the slide table, the telescopic table and the supporting plate will move with the slide plate, and the distance between the supporting plate and the bending machine can be adjusted at this time; the slide plate is driven by the second movable member to move vertically upward or downward, thereby adjusting the height position of the supporting plate; the slide table and the telescopic table are driven by the third movable member to move horizontally independently, thereby adjusting the position of the supporting plate; the two supporting plates can be dislocated by extending and retracting the telescopic table; the two supporting plates can be adjusted by the above process to adapt to the bending of various types of workpiece sheets (such as conical workpiece bending, angular workpiece bending, double-piece double-positioning bending, etc.), and it is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a structural schematic diagram of this embodiment;
[0018] Figure 2 This is a schematic diagram of the structure of the bottom plate of this embodiment;
[0019] Figure 3 This is a schematic diagram of the structure of the slide frame according to the present embodiment;
[0020] Figure 4 This is a schematic diagram of the structure of the vertical plate of this embodiment;
[0021] Figure 5 This is a schematic diagram of the structure of the second slide rail in this embodiment;
[0022] Figure 6 for Figure 2A schematic diagram of the enlarged structure of part A in the middle.
[0023] Description of reference numerals:
[0024] In the figure: 1, base; 2, bottom plate; 3, slide plate; 4, slide frame; 5, slide table; 6, telescopic table; 7, support plate; 8, first slide rail; 9, vertical plate; 10, first screw rod; 12, first push plate; 13, first transmission shaft; 14, first pulley; 15, mounting plate; 16, first motor; 17, second pulley; 18, first transmission belt; 19, horizontal plate; 20, vertical plate; 21, second slide rail; 22, second push plate; 23, horizontal plate; 24, second Screw rod; 25, second transmission shaft; 26, third pulley; 27, support plate; 28, second motor; 29, fourth pulley; 30, second transmission belt; 31, first belt tensioning wheel; 32, second belt tensioning wheel; 33, third slide rail; 34, rack; 35, suspension plate; 36, third motor; 37, gear; 38, slide seat; 39, moving seat; 40, fourth slide rail; 41, side plate; 42, third screw rod; 43, third push plate; 44, fourth motor. DETAILED DESCRIPTION
[0025] 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.
[0026] A five-axis linkage back gauge mechanism for a bending machine, such as Figure 1 and Figure 2 , including a base 1 connected to the frame of the bending machine and a bottom plate 2 detachably connected to the top of the base 1, the bottom plate 2 is installed on the base 1 by bolts, and an inverted U-shaped slide plate 3 is horizontally slidably connected to the bottom plate 2 in the direction of approaching or moving away from the bending machine through a first movable member, and a slide frame 4 is vertically slidably connected to the slide frame 3 through a second movable member, and the top of the slide frame 4 is horizontally slidably connected to a slide table 5 and a telescopic table 6 through a third movable member, and a supporting plate 7 is provided on the slide table 5 and the telescopic table 6.
[0027] like Figure 1 and Figure 2The first movable member drives the slide plate 3 to move horizontally in the direction of approaching or moving away from the bending machine. At this time, the slide 4, the slide table 5, the telescopic table 6 and the supporting plate 7 will move with the slide plate 3. At this time, the distance between the supporting plate 7 and the bending machine can be adjusted. The second movable member drives the slide plate 4 to move vertically upward or downward, so that the height position of the supporting plate 7 can be adjusted. The third movable member drives the slide table 5 and the telescopic table 6 to move horizontally independently, so that the position of the supporting plate 7 can be adjusted. The telescopic table 6 is extended and retracted to make the two supporting plates 7 misaligned. By adjusting the two supporting plates 7 through the above process, it can adapt to various types of workpiece sheet bending (such as conical workpiece bending, angular workpiece bending, double-piece double-positioning bending, etc.). The first movable member, the second movable member and the third movable member do not affect each other, and are easy to use.
[0028] like Figure 2 and Figure 3 The first moving member includes two first slide rails 8 horizontally arranged on the bottom plate 2 along the length direction of the bottom plate 2, and the two first slide rails 8 are opposite to each other. The bottom plate 2 and one end of the two first slide rails 8 pass through the slide plate 3. The slide plate 3 is horizontally slidably connected to the two first slide rails 8. The top of the bottom plate 2 is provided with two opposite vertical plates 9, and a first screw rod 10 is rotatably connected between the two vertical plates 9. A first push plate 12 is detachably connected to the slide plate 3, and the first push plate 12 is located between the two vertical plates 9. One end of the first screw rod 10 A first transmission shaft 13 is coaxially provided at one end of the first screw rod 10, and an end of the first transmission shaft 13 away from the first screw rod 10 passes through one of the vertical plates 9 and is provided with a first pulley 14. A mounting plate 15 is provided on the base plate 2, and a first motor 16 is provided on one side of the mounting plate 15. One end of the rotating shaft of the first motor 16 passes through the mounting plate 15 and is provided with a second pulley 17. The first pulley 14 and the second pulley 17 are connected by a first transmission belt 18.
[0029] like Figure 2 and Figure 3 When it is necessary to drive the slide plate 3 to move horizontally toward or away from the bending machine, it is only necessary to turn on the first motor 16. The rotating shaft of the first motor 16 drives the second pulley 17 to rotate. The second pulley 17 drives the first pulley 14 to rotate through the first transmission belt 18. At this time, the first pulley 14 will drive the first screw rod 10 to rotate through the first transmission shaft 13. At this time, because one end of the first screw rod 10 passes through the first push plate 12 and is threadedly connected to it, and the first push plate 12 is arranged on the slide plate 3, when the first screw rod 10 rotates, the slide plate 3 can be pushed by the first push plate 12 to move horizontally on the first slide rail 8 toward or away from the bending machine. The first push plate 12 is installed on the slide plate 3 by bolts, which is simple and convenient to use.
[0030] like Figure 2 and Figure 3 and Figure 4 and Figure 5 The slide 4 includes a transverse plate 19 and two opposite vertical plates 20, the transverse plate 19 is horizontally arranged at the top of the two vertical plates 20, the second moving member includes two second slide rails 21, and the two second slide rails 21 are respectively vertically slidably connected to the two sides of the slide plate 3 that are away from each other, the two second slide rails 21 are respectively vertically arranged on the two vertical plates 20, and the slide plate 3 is provided with two opposite second push plates 22, and the two second push plates 22 are respectively close to the two vertical plates 20, and the two vertical plates 20 are close to the second push plates 22. The side of the second push plates 22 is provided with a horizontal plate 23 located above the second push plates 22, and the bottom ends of the two horizontal plates 23 are rotatably connected to the second screw rods 24, and the two second screw rods 24 are respectively The bottom ends respectively pass through the two second push plates 22 and are threadedly connected thereto, the top ends of the two second screw rods 24 are coaxially provided with a second transmission shaft 25, and the top ends of the two second transmission shafts 25 pass through the horizontal plate 23 located above and are provided with a third pulley 26, a support plate 27 is provided on one side of the transverse plate 19, and a second motor 28 is provided on the support plate 27, one end of the rotating shaft of the second motor 28 passes through the support plate 27 and is provided with a fourth pulley 29 located below the support plate 27, the fourth pulley 29 is connected to the two third pulleys 26 through a second transmission belt 30, and the slide 5 and the telescopic table 6 are horizontally slidably connected to the top of the transverse plate 19 through a third movable member.
[0031] like Figure 2 and Figure 3 and Figure 4 and Figure 5 When it is necessary to drive the slide 4 to move vertically upward or downward, it is only necessary to turn on the second motor 28. The rotating shaft of the second motor 28 drives the fourth pulley 29 to rotate. The fourth pulley 29 drives the two third pulleys 26 to rotate synchronously through the second transmission belt 30. At this time, the two third pulleys 26 will respectively drive the two second screw rods 24 to rotate through the two second transmission shafts 25. At this time, because one end of the second screw rod 24 passes through the two second push plates 22 and is threadedly connected thereto, when the two second screw rods 24 rotate synchronously, the slide 4 can be driven to move vertically upward or downward through the two second push plates 22. It is simple and convenient to use.
[0032] like Figure 2 and Figure 3 and Figure 4 A first belt tensioning wheel 31 for tightening the first transmission belt 18 is provided on the mounting plate 15, and a second belt tensioning wheel 32 for tightening the second transmission belt 30 is provided on the supporting plate 27. The purpose of this arrangement is to tighten the first transmission belt 18 by the first belt tensioning wheel 31, thereby reducing the slipping of the first transmission belt 18, and to tighten the second transmission belt 30 by the second belt tensioning wheel 32, thereby reducing the slipping of the second transmission belt 30, and the use is simple and convenient.
[0033] like Figure 2 The third moving member includes a third slide rail 33 and a rack 34 arranged at the top of the horizontal plate 19 along the length direction of the horizontal plate 19. The third slide rail 33 and the rack 34 are arranged side by side. The slide 5 and the telescopic table 6 are both horizontally slidably connected to the third slide rail 33, and a hanging plate 35 is provided on one side of the slide 5 and the telescopic table 6, and a third motor 36 is provided at the top of the two hanging plates 35. The rack 34 is located below the slide 5 and the telescopic table 6. One end of the rotating shaft of the two third motors 36 passes through the hanging plate 35 and is provided with a gear 37 located below the hanging plate 35. The two gears 37 are meshed with the rack 34.
[0034] like Figure 2 When it is necessary to drive the slide 5 and the telescopic table 6 to move horizontally independently, it is only necessary to turn on the two third motors 36 respectively, and the rotating shafts of the two third motors 36 respectively drive the two gears 37 to rotate. At this time, because the two gears 37 are engaged with the rack 34, and the rack 34 is fixed to the top of the cross plate 19, when the two gears 37 rotate, through the cooperation of the two gears 37 and the rack 34, the slide 5 and the telescopic table 6 can be driven to move horizontally independently on the third slide rail 33, which is simple and convenient to use.
[0035] like Figure 2 and Figure 6 The telescopic table 6 includes a slide seat 38 and a moving seat 39. The slide seat 38 is horizontally slidably connected to the third slide rail 33, and a fourth slide rail 40 is horizontally provided at the top of the slide seat 38. The moving seat 39 is horizontally slidably connected to the fourth slide rail 40. The supporting plate 7 on the telescopic table 6 is arranged on one side of the moving seat 39. The moving seat 39 slides along the width direction of the cross plate 19 on the fourth slide rail 40. A side plate 41 is provided at the top of the slide seat 38, and the side plate 41 is located on one side of the fourth slide rail 40. A third screw rod 42 is rotatably connected to one side of the side plate 41. A third push plate 43 located on one side of the side plate 41 is provided on the moving seat 39. One end of the third screw rod 42 passes through the third push plate 43 and is threadedly connected to the third push plate 43. A fourth motor 44 for driving the third screw rod 42 to rotate is provided on the slide seat 38.
[0036] like Figure 2 and Figure 6 By turning on the fourth motor 44, the rotating shaft of the fourth motor 44 drives the third screw rod 42 to rotate. At this time, because one end of the third screw rod 42 passes through the third push plate 43 and is threadedly connected thereto, the third push plate 43 is arranged on the moving seat 39. Therefore, when the third screw rod 42 rotates, the third push plate 43 can drive the moving seat 39 to slide on the fourth slide rail 40 along the width direction of the cross plate 19. At this time, the moving seat 39 and the supporting plate 7 on the moving seat 39 are close to or away from the bending machine. At this time, the supporting plate 7 on the moving seat 39 can be misaligned with the supporting plate 7 on the slide 5, which is simple and convenient to use.
[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A five-axis linkage rear stopper mechanism for a bending machine, characterized in that: It comprises a base (1) connected to a frame of a bending machine and a bottom plate (2) detachably connected to the top of the base (1); The bottom plate (2) is horizontally connected to an inverted U-shaped slide plate (3) via a first movable member in a direction close to or away from the bending machine, and the slide plate (3) is vertically connected to a slide frame (4) via a second movable member, and the top of the slide frame (4) is horizontally connected to a slide table (5) and a telescopic table (6) via a third movable member; The sliding platform (5) and the telescopic platform (6) are both provided with a supporting plate (7).
2. A five-axis linkage rear stopper mechanism for a bending machine as claimed in claim 1, characterized in that: The first moving member comprises two first slide rails (8) horizontally arranged on the bottom plate (2) along the length direction of the bottom plate (2); one end of the bottom plate (2) and the two first slide rails (8) pass through the slide plate (3); the slide plate (3) is horizontally slidably connected to the two first slide rails (8); two opposite vertical plates (9) are provided at the top end of the bottom plate (2); a first screw rod (10) is rotatably connected between the two vertical plates (9); a first push plate (12) is detachably connected to the slide plate (3); the first push plate (12) is located between the two vertical plates (9); one end of the first screw rod (10) passes through the first push plate (12); The plate (12) is threadedly connected to the first push plate (12); one end of the first screw rod (10) is coaxially provided with a first transmission shaft (13); one end of the first transmission shaft (13) away from the first screw rod (10) passes through one of the vertical plates (9) and is provided with a first pulley (14); a mounting plate (15) is provided on the base plate (2); a first motor (16) is provided on one side of the mounting plate (15); one end of the rotating shaft of the first motor (16) passes through the mounting plate (15) and is provided with a second pulley (17); the first pulley (14) and the second pulley (17) are connected via a first transmission belt (18).
3. A five-axis linkage rear stopper mechanism for a bending machine as claimed in claim 2, characterized in that: The slide frame (4) comprises a transverse plate (19) and two opposite vertical plates (20), wherein the transverse plate (19) is horizontally arranged at the top ends of the two vertical plates (20), the second movable member comprises two second slide rails (21), and the two second slide rails (21) are respectively vertically slidably connected to the two sides of the slide plate (3) which are away from each other, the two second slide rails (21) are respectively vertically arranged on the two vertical plates (20), the slide plate (3) is provided with two opposite second push plates (22), and the two second push plates (22) are respectively close to the two vertical plates (20), the two vertical plates (20) are each provided with a horizontal plate (23) located above the second push plate (22), and the bottom ends of the two horizontal plates (23) are both rotatably connected to a second screw rod (24), and the two second screw rods (24) are respectively connected to the second push plates (22). ) respectively pass through two second push plates (22) and are threadedly connected thereto, the top ends of the two second screw rods (24) are coaxially provided with second transmission shafts (25), and the top ends of the two second transmission shafts (25) pass through the horizontal plate (23) located above and are provided with third pulleys (26), a support plate (27) is provided on one side of the horizontal plate (19), and a second motor (28) is provided on the support plate (27), one end of the rotating shaft of the second motor (28) passes through the support plate (27) and is provided with a fourth pulley (29) located below the support plate (27), the fourth pulley (29) is connected to the two third pulleys (26) through a second transmission belt (30), and the slide table (5) and the telescopic table (6) are horizontally slidably connected to the top of the horizontal plate (19) through a third moving member.
4. A five-axis linkage rear stopper mechanism for a bending machine as claimed in claim 3, characterized in that: The mounting plate (15) is provided with a first belt tensioning wheel (31) for pressing the first transmission belt (18), and the support plate (27) is provided with a second belt tensioning wheel (32) for pressing the second transmission belt (30).
5. A five-axis linkage rear stopper mechanism for a bending machine as claimed in claim 3, characterized in that: The third moving member comprises a third slide rail (33) and a rack (34) arranged at the top of the horizontal plate (19) along the length direction of the horizontal plate (19); the third slide rail (33) and the rack (34) are arranged side by side; the slide table (5) and the telescopic table (6) are both horizontally slidably connected to the third slide rail (33); a suspension plate (35) is provided on one side of the slide table (5) and the telescopic table (6); and a third motor (36) is provided at the top of the two suspension plates (35); one end of the rotating shaft of the two third motors (36) passes through the suspension plate (35) and is provided with a gear (37) located below the suspension plate (35); and the two gears (37) are meshed with the rack (34).
6. A five-axis linkage rear stopper mechanism for a bending machine as claimed in claim 5, characterized in that: The telescopic platform (6) comprises a slide seat (38) and a movable seat (39), wherein the slide seat (38) is horizontally slidably connected to the third slide rail (33), and a fourth slide rail (40) is horizontally arranged at the top of the slide seat (38), and the movable seat (39) is horizontally slidably connected to the fourth slide rail (40), a supporting plate (7) on the telescopic platform (6) is arranged on one side of the movable seat (39), a hanging plate (35) on the telescopic platform (6) is arranged on the slide seat (38), and the movable seat (39) is arranged on the fourth slide rail (40) along the horizontal plate (19) The sliding seat (38) is configured to slide in the width direction, a side plate (41) is provided at the top end of the sliding seat (38), and the side plate (41) is located on one side of the fourth sliding rail (40), one side of the side plate (41) is rotatably connected to a third screw rod (42), the movable seat (39) is provided with a third push plate (43) located on one side of the side plate (41), one end of the third screw rod (42) passes through the third push plate (43) and is threadedly connected to the third push plate (43), and the sliding seat (38) is provided with a fourth motor (44) for driving the third screw rod (42) to rotate.