Nickel strip hot rolling forming device with temperature control function

Abstract

The nickel strip hot rolling forming device with the temperature control function comprises a bottom plate and a heating box, the heating box is fixedly installed on the top face of the bottom plate, and guide rollers are evenly arranged in the heating box; the controller is mounted on the front side surface of the heating box; the two symmetrically-arranged through grooves are formed in the left side wall and the right side wall of the heating box in a penetrating mode correspondingly; the heater is fixedly mounted on the inner top surface of the heating box, and the heater is electrically connected with the controller; and the temperature detector is mounted on the inner top surface of the heating box. According to the nickel strip hot rolling forming device with the temperature control function, it can be guaranteed that a nickel strip is heated before hot rolling of the nickel strip, the heating problem can be controlled and adjusted, the nickel strip hot rolling effect is guaranteed, meanwhile, trimming is conducted after hot rolling of the nickel strip, follow-up operation is avoided, the nickel strip production efficiency is improved, the equipment linkage performance is high, and the use functionality is high.

Description

Technical Field

[0001] The invention relates to the technical field of nickel strip production equipment, in particular to a nickel strip hot rolling forming device with a temperature control function. Background Art

[0002] Nickel strip is a silvery-white rolled material used to connect the positive and negative electrodes of the battery cell with the battery protection board. It is mainly used in the manufacture of nickel-cadmium, nickel-metal hydride, nickel batteries, combined batteries and instrumentation, telecommunications, electric vacuum, special light bulbs and other industries. Nickel strip is usually processed by hot rolling forming devices during the production process, but the existing nickel strip hot rolling forming devices still have certain defects, such as:

[0003] The "An Improved Hot Rolling Mill for the Preparation of Nickel Strip" with application number CN202120531150.0 cannot trim the hot-rolled nickel strip during use, and has poor functionality, so that additional trimming operations are required after hot-rolling the nickel strip, which reduces the production efficiency of the nickel strip. At the same time, it lacks the heating function before hot-rolling the nickel strip, and cannot control the heating temperature of the nickel strip, which has limitations in use;

[0004] In view of this, in order to solve the above problems, a nickel strip hot rolling forming device with temperature control function is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a nickel strip hot rolling forming device with temperature control function to solve the problem mentioned in the above background technology that the existing nickel strip hot rolling forming device is inconvenient to trim the nickel strip after hot rolling, which reduces the production efficiency of the nickel strip.

[0006] To achieve the above object, the present invention provides the following technical solution: a nickel strip hot rolling forming device with temperature control function, comprising a bottom plate,

[0007] A heating box, the heating box is fixedly mounted on the top surface of the bottom plate, and guide rollers are evenly arranged inside the heating box;

[0008] A controller, the controller being mounted on the front side of the heating box;

[0009] Through grooves, two symmetrically arranged through grooves respectively penetrating the left and right side walls of the heating box;

[0010] A heater, the heater is fixedly mounted on the inner top surface of the heating box, and the heater is electrically connected to the controller;

[0011] A temperature detector, which is mounted on the inner top surface of the heating box and is electrically connected to the controller;

[0012] A fixing frame, the fixing frame is fixedly mounted on the top surface of the bottom plate, and the fixing frame is located on the right side of the heating box;

[0013] A hot rolling mechanism, wherein the hot rolling mechanism is arranged on the heating box;

[0014] A rotating mechanism connected to the hot rolling mechanism;

[0015] A transmission mechanism connected to the rotating mechanism;

[0016] A trimming mechanism connected to the transmission mechanism;

[0017] An adjusting mechanism is connected to the trimming mechanism.

[0018] The above technical solution makes it easy to control the heating temperature of the nickel strip and perform trimming after hot rolling.

[0019] As a preferred technical solution of the present invention, the hot rolling mechanism comprises:

[0020] A first bidirectional screw rod, wherein the first bidirectional screw rod bearing is arranged to penetrate the top surface of the fixing frame, and the bottom end of the first bidirectional screw rod is connected to the top surface bearing of the bottom plate;

[0021] A first rotating wheel, the first rotating wheel is coaxially fixedly mounted on the top end of the first bidirectional screw rod;

[0022] Sliding angle brackets, two symmetrically arranged sliding angle brackets are slidably connected to the rear inner wall surface of the fixed bracket, and the first bidirectional screw rod passes through the sliding angle brackets, and the first bidirectional screw rod is threadedly connected to the sliding angle brackets;

[0023] A rotating shaft, wherein a transverse bearing of the rotating shaft is arranged through the front side wall of the sliding angle frame;

[0024] A hot rolling roller is fixedly sleeved on the surface of the rotating shaft.

[0025] By adopting the above technical solution, when the two sliding angle frames are moved toward each other through the rotation of the first bidirectional screw, the rotating shaft and the hot rolling rollers are driven to move toward each other, thereby ensuring the hot rolling processing of the nickel strip.

[0026] As a preferred technical solution of the present invention, the front end of the rotating shaft is rotatably connected to a first sliding seat, and the first sliding seat is slidably connected to the front inner wall surface of the fixing frame.

[0027] The above technical solution is adopted to ensure the stability of the rotation of the shaft.

[0028] As a preferred technical solution of the present invention, the rotating mechanism comprises:

[0029] A motor, the motor being fixedly mounted on the inner top surface of the fixing frame;

[0030] A driving shaft, the top end of which is keyed to the shaft end of the motor, and the bottom end of which is connected to the top surface bearing of the bottom plate;

[0031] A hollow tube, wherein the longitudinal bearing of the hollow tube passes through the sliding angle bracket, and the drive shaft passes through the hollow tube;

[0032] Connecting slide grooves, the connecting slide grooves are symmetrically arranged in pairs and are opened on the surface of the driving shaft;

[0033] A connecting slider, wherein the driving shaft is fixedly mounted on the inner wall surface of the hollow tube, and the connecting slider is slidably connected to the connecting slide groove;

[0034] A bevel gear set is sleeved on the outer wall surface of the hollow tube and is fixedly connected to the rear end of the rotating shaft.

[0035] By adopting the above technical solution, when the driving shaft rotates, the hollow tube is driven to rotate through the setting of the connecting slider and the connecting slot, so that the rotating shaft and the hot rolling roller are driven to rotate through the bevel gear set, thereby ensuring effective processing of the nickel strip.

[0036] As a preferred technical solution of the present invention, the transmission mechanism includes:

[0037] A connecting plate, the connecting plate is fixedly mounted on the right side of the sliding angle bracket;

[0038] A transmission rod, the rear end of which is rotatably connected to the front side of the connecting plate, and the structure of the transmission rod is a square;

[0039] A driving pulley, the driving pulley is fixedly sleeved on the rotating shaft;

[0040] The driven pulley is fixedly sleeved on the transmission rod, and the driven pulley is connected with the driving pulley through a belt transmission.

[0041] By adopting the above technical solution, the driving pulley, the belt and the driven pulley can drive the transmission rod to rotate when the rotating shaft rotates.

[0042] As a preferred technical solution of the present invention, the front end of the transmission rod is rotatably connected to a second slide seat, and the second slide seat is slidably connected to the front inner wall surface of the fixing frame.

[0043] The above technical solution is adopted to ensure the stability of the rotation of the transmission rod.

[0044] As a preferred technical solution of the present invention, the trimming mechanism comprises:

[0045] A hollow tube, the hollow tube being symmetrically arranged and slidingly sleeved on the surface of the transmission rod, and the hollow tube is a structure with an outer circle and an inner square that matches the transmission rod;

[0046] A cutting disc is fixedly sleeved on the outer wall surface of the hollow tube.

[0047] By adopting the above technical solution, the hollow tube and the cutting disc can be driven to rotate when the transmission rod rotates, thereby achieving the trimming of the nickel strip.

[0048] As a preferred technical solution of the present invention, the adjustment mechanism includes:

[0049] Slide plates, two symmetrically arranged slide plates are slidably connected to the inner top surface of the fixing frame;

[0050] A through slide, wherein the through slide is provided on the slide;

[0051] A connecting plate, the connecting plate is sleeved on the outer wall surface of the hollow tube, the connecting plate is connected to the hollow tube bearing, and the connecting plate is longitudinally slidably connected to the wall surface of the through slide groove;

[0052] A second bidirectional screw, wherein the bearing of the second bidirectional screw penetrates the front side wall of the fixing frame, and the second bidirectional screw penetrates the slide plate, and the second bidirectional screw is threadedly connected to the slide plate, and the rear end of the second bidirectional screw is connected to the bearing of the rear inner wall surface of the fixing frame;

[0053] The second rotating wheel is coaxially fixedly mounted on the front end of the second bidirectional screw rod.

[0054] By adopting the above technical solution, the second bidirectional screw can drive the two slides to move in opposite directions when rotating, so that the connecting plate, the hollow tube and the cutting disk move synchronously, thereby adjusting the distance between the two cutting disks in the horizontal direction, realizing the adjustment of the trimming distance and improving the flexibility of use.

[0055] Compared with the prior art, the invention has the following beneficial effects: the nickel strip hot rolling forming device with temperature control function can ensure that the nickel strip is heated before hot rolling, and can control and adjust the heating problem to ensure the hot rolling effect of the nickel strip, and at the same time, trimming is performed after the hot rolling process of the nickel strip to avoid subsequent operations, thereby improving the production efficiency of the nickel strip, and the equipment has high linkage and strong functionality;

[0056] 1. Start the heater through the controller to heat the nickel strip, and use the temperature detector to detect the temperature in real time and feed it back to the controller. According to the detected temperature, the controller controls and adjusts the heating temperature of the heater to ensure the hot rolling effect of the nickel strip;

[0057] 2. By rotating the first rotating wheel to rotate the first bidirectional screw, the two movable angle frames move toward each other, so that the rotating shaft and the hot rolling roller move toward each other, ensuring that the hot rolling roller contacts the nickel strip;

[0058] 3. When the movable angle bracket moves, it drives the connecting plate and the transmission rod to move synchronously, so that the transmission rod drives the hollow tube and the cutting disc to move under the sliding connection between the connecting plate and the through slide groove, so that the upper and lower cutting plates move to contact the nickel belt;

[0059] 4. Start the motor to rotate the shaft, and drive the hollow tube to rotate through the action of the connecting slider and the connecting chute, so that the shaft and the hot rolling roller are driven to rotate through the bevel gear set to realize the hot rolling processing of the nickel strip;

[0060] 5. When the shaft rotates, the driving pulley, belt and driven pulley drive the transmission rod to rotate, so that the transmission rod drives the hollow tube and the cutting disc to rotate synchronously, thereby achieving the trimming of the nickel strip;

[0061] 6. Rotate the second rotating wheel to rotate the second bidirectional screw, so that the two slides move in opposite directions, thereby driving the hollow tube and the cutting disc to move through the connecting plate, and then adjusting the horizontal cutting disc spacing to achieve the adjustment of the trimming distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0063] Figure 2 This is a schematic diagram of the front cross-sectional structure of the heating box of the present invention;

[0064] Figure 3 It is a schematic diagram of the connection structure of the sliding angle bracket, the rotating shaft and the hollow tube from the left side of the present invention;

[0065] Figure 4 It is a schematic diagram of the front cross-sectional structure of the fixing frame of the present invention;

[0066] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional connection structure of the connecting slider and the connecting chute of the present invention;

[0067] Figure 6 It is a schematic diagram of a top cross-sectional structure of a fixing frame of the present invention;

[0068] Figure 7 It is a schematic diagram of the cross-sectional connection structure of the hollow tube, the transmission rod and the connecting plate of the present invention from the left side;

[0069] Figure 8 It is a schematic diagram of the three-dimensional connection structure of the connecting plate, the through slide groove and the hollow tube of the present invention.

[0070] In the figure: 1. bottom plate; 2. heating box; 3. controller; 4. through groove; 5. heater; 6. temperature detector; 7. fixed frame; 8. first bidirectional screw rod; 9. first rotating wheel; 10. sliding angle frame; 11. rotating shaft; 12. hot rolling roller; 13. first slide seat; 14. motor; 15. driving shaft; 16. hollow tube; 17. connecting slide groove; 18. connecting slider; 19. bevel gear set; 20. connecting plate; 21. transmission rod; 22. driving pulley; 23. driven pulley; 24. belt; 25. second slide seat; 26. hollow tube; 27. cutting disk; 28. slide plate; 29. ​​through slide groove; 30. connecting plate; 31. second bidirectional screw rod; 32. second rotating wheel. DETAILED DESCRIPTION

[0071] 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.

[0072] See also Figure 1-8 , the technical solution of the present invention: a nickel strip hot rolling forming device with temperature control function, comprising a bottom plate 1, a heating box 2 fixedly mounted on the top surface of the bottom plate 1, and guide rollers are evenly arranged inside the heating box 2, a controller 3 is mounted on the front side of the heating box 2, two symmetrically arranged through grooves 4 are respectively penetrated and opened on the left and right side walls of the heating box 2, a heater 5 is fixedly mounted on the inner top surface of the heating box 2, and the heater 5 is electrically connected to the controller 3, a temperature detector 6 is mounted on the inner top surface of the heating box 2, and the temperature detector 6 is electrically connected to the controller 3, a fixing frame 7 is fixedly mounted on the top surface of the bottom plate 1, and the fixing frame 7 is located on the right side of the heating box 2;

[0073] The bearing of the first bidirectional screw 8 is set to pass through the top surface of the fixed frame 7, and the bottom end of the first bidirectional screw 8 is connected to the top surface bearing of the bottom plate 1, the first rotating wheel 9 is coaxially fixedly installed on the top of the first bidirectional screw 8, the two symmetrically arranged sliding angle frames 10 are slidably connected to the rear inner wall surface of the fixed frame 7, and the first bidirectional screw 8 is set to pass through the sliding angle frame 10, and the first bidirectional screw 8 is threadedly connected to the sliding angle frame 10, the horizontal bearing of the rotating shaft 11 passes through the front side wall of the sliding angle frame 10, the front end of the rotating shaft 11 is rotatably connected to the first sliding seat 13, and the first sliding seat 13 is slidably connected to the front inner wall surface of the fixed frame 7, and the hot rolling roller 12 is fixedly sleeved on the surface of the rotating shaft 11;

[0074] The motor 14 is fixedly mounted on the inner top surface of the fixing frame 7, and the motor 14 is electrically connected to the controller 3. The top end of the driving shaft 15 is keyed to the shaft end of the motor 14, and the bottom end of the driving shaft 15 is connected to the top surface bearing of the bottom plate 1. The longitudinal bearing of the hollow tube 16 passes through the sliding angle frame 10, and the driving shaft 15 passes through the hollow tube 16. The connecting grooves 17 symmetrically arranged in pairs are opened on the surface of the driving shaft 15. The driving shaft 15 is fixedly mounted on the inner wall surface of the hollow tube 16, and the connecting slider 18 is slidably connected to the connecting groove 17. The bevel gear set 19 is sleeved on the outer wall surface of the hollow tube 16, and the bevel gear set 19 is fixedly connected to the rear end of the rotating shaft 11.

[0075] The connecting plate 20 is fixedly mounted on the right side of the sliding angle frame 10, the rear end of the transmission rod 21 is rotatably connected to the front side of the connecting plate 20, and the structure of the transmission rod 21 is square, the front end of the transmission rod 21 is rotatably connected to the second slide seat 25, and the second slide seat 25 is slidably connected to the front inner wall surface of the fixed frame 7, the driving pulley 22 is fixedly sleeved on the rotating shaft 11, and the driven pulley 23 is fixedly sleeved on the transmission rod 21, and the driven pulley 23 is connected to the driving pulley 22 through a belt 24.

[0076] The symmetrically arranged hollow tube 26 is slidably mounted on the surface of the transmission rod 21, and the hollow tube 26 is a structure with an outer circle and an inner square that matches the transmission rod 21, and the cutting disc 27 is fixedly mounted on the outer wall of the hollow tube 26;

[0077] Two symmetrically arranged slides 28 are slidably connected to the inner top surface of the fixed frame 7, and a through slide groove 29 is opened on the slide plate 28. The connecting plate 30 is sleeved on the outer wall surface of the hollow tube 26, and the connecting plate 30 is connected to the hollow tube 26 by bearings, and the connecting plate 30 is longitudinally slidably connected to the wall surface of the through slide groove 29. The second bidirectional screw rod 31 is arranged with a bearing that passes through the front side wall of the fixed frame 7, and the second bidirectional screw rod 31 passes through the slide plate 28, and the second bidirectional screw rod 31 is threadedly connected to the slide plate 28, and the rear end of the second bidirectional screw rod 31 is connected to the bearing of the rear inner wall surface of the fixed frame 7, and the second rotating wheel 32 is coaxially fixedly installed on the front end of the second bidirectional screw rod 31.

[0078] Working principle: The heater 5 is started by the controller 3 to heat the nickel strip, and the temperature is detected in real time by the temperature detector 6 and fed back to the controller 3, and then the heater 5 is controlled by the controller 3 to adjust the heating temperature;

[0079] The first rotating wheel 9 is rotated to rotate the first bidirectional screw 8, so that the two sliding angle brackets 10 move toward each other, thereby making the rotating shaft 11 and the hot rolling roller 12 move synchronously, ensuring that the hot rolling roller 12 contacts the nickel strip;

[0080] When the sliding angle frame 10 moves, it drives the connecting plate 20 and the transmission rod 21 to move synchronously, so that the transmission rod 21 drives the hollow tube 26 and the cutting disc 27 to move in the vertical direction, so that the cutting discs 27 on the upper and lower sides contact the nickel belt;

[0081] The motor 14 is started to rotate the driving shaft 15, and the hollow tube 16 is driven to rotate synchronously under the action of the connecting slider 18 and the connecting chute 17, and the rotating shaft 11 and the hot rolling roller 12 are driven to rotate synchronously through the bevel gear set 19 to achieve hot rolling of the nickel strip;

[0082] When the rotating shaft 11 rotates, the driving pulley 22 is driven to rotate, and the driven pulley 23 drives the transmission rod 21 to rotate synchronously through the action of the belt 24, so that the transmission rod 21 drives the hollow tube 26 and the cutting disc 27 to rotate to cut and trim the nickel strip;

[0083] By rotating the second rotating wheel 32 to rotate the second bidirectional screw rod 31, the two slide plates 28 are moved in opposite directions, so that the connecting plate 30 drives the hollow tube 26 and the cutting disc 27 to move, and then the spacing between the cutting discs 27 in the horizontal direction is adjusted to achieve the adjustment of the trimming distance. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nickel strip hot rolling forming device with temperature control function, comprising a bottom plate (1), characterized in that: Also includes: A heating box (2), the heating box (2) being fixedly mounted on the top surface of the bottom plate (1), and guide rollers being evenly arranged inside the heating box (2); A controller (3), wherein the controller (3) is mounted on the front side of the heating box (2); Through grooves (4), two symmetrically arranged through grooves (4) respectively penetrating the left and right side walls of the heating box (2); A heater (5), wherein the heater (5) is fixedly mounted on the inner top surface of the heating box (2), and the heater (5) is electrically connected to the controller (3); A temperature detector (6), the temperature detector (6) being mounted on the inner top surface of the heating box (2), and the temperature detector (6) being electrically connected to the controller (3); A fixing frame (7), the fixing frame (7) being fixedly mounted on the top surface of the bottom plate (1), and the fixing frame (7) being located on the right side of the heating box (2); A hot rolling mechanism, wherein the hot rolling mechanism is arranged on the heating box (2); A rotating mechanism connected to the hot rolling mechanism; A transmission mechanism connected to the rotating mechanism; A trimming mechanism connected to the transmission mechanism; An adjusting mechanism is connected to the trimming mechanism.

2. A nickel strip hot rolling forming device with temperature control function according to claim 1, characterized in that: The hot rolling mechanism comprises: A first bidirectional screw rod (8), wherein a bearing of the first bidirectional screw rod (8) is arranged to pass through the top surface of the fixing frame (7), and the bottom end of the first bidirectional screw rod (8) is connected to the bearing on the top surface of the bottom plate (1); A first rotating wheel (9), the first rotating wheel (9) being coaxially fixedly mounted on the top end of the first bidirectional screw rod (8); A sliding angle frame (10), wherein two symmetrically arranged sliding angle frames (10) are slidably connected to the inner wall surface of the rear side of the fixed frame (7), and the first bidirectional screw rod (8) is arranged to penetrate the sliding angle frame (10), and the first bidirectional screw rod (8) is threadedly connected to the sliding angle frame (10); A rotating shaft (11), wherein a transverse bearing of the rotating shaft (11) is arranged to penetrate the front side wall of the sliding angle frame (10); A hot rolling roller (12), wherein the hot rolling roller (12) is fixedly sleeved on the surface of the rotating shaft (11).

3. A nickel strip hot rolling forming device with temperature control function according to claim 2, characterized in that: The front end of the rotating shaft (11) is rotatably connected to a first sliding seat (13), and the first sliding seat (13) is slidably connected to the front inner wall surface of the fixing frame (7).

4. A nickel strip hot rolling forming device with temperature control function according to claim 2, characterized in that: The rotating mechanism comprises: A motor (14), wherein the motor (14) is fixedly mounted on the inner top surface of the fixing frame (7), and the motor (14) is electrically connected to the controller (3); A driving shaft (15), the top end of the driving shaft (15) is key-connected to the shaft end of the motor (14), and the bottom end of the driving shaft (15) is connected to the top surface bearing of the bottom plate (1); A hollow tube (16), wherein a longitudinal bearing of the hollow tube (16) is disposed through the sliding angle bracket (10), and the drive shaft (15) is disposed through the hollow tube (16); Connecting slide grooves (17), the connecting slide grooves (17) being symmetrically arranged in pairs and opened on the surface of the driving shaft (15); A connecting slider (18), the driving shaft (15) is fixedly mounted on the inner wall surface of the hollow tube (16), and the connecting slider (18) is slidably connected to the connecting slide groove (17); A bevel gear set (19), wherein the bevel gear set (19) is sleeved on the outer wall surface of the hollow tube (16), and the bevel gear set (19) is fixedly connected to the rear end of the rotating shaft (11).

5. A nickel strip hot rolling forming device with temperature control function according to claim 4, characterized in that: The transmission mechanism comprises: A connecting plate (20), wherein the connecting plate (20) is fixedly mounted on the right side of the sliding angle bracket (10); A transmission rod (21), the rear end of the transmission rod (21) is rotatably connected to the front side of the connecting plate (20), and the structure shape of the transmission rod (21) is square; A driving pulley (22), wherein the driving pulley (22) is fixedly sleeved on the rotating shaft (11); A driven pulley (23) is fixedly sleeved on the transmission rod (21), and the driven pulley (23) is connected to the driving pulley (22) through a belt (24).

6. A nickel strip hot rolling forming device with temperature control function according to claim 5, characterized in that: The front end of the transmission rod (21) is rotatably connected to a second slide seat (25), and the second slide seat (25) is slidably connected to the front inner wall surface of the fixing frame (7).

7. A nickel strip hot rolling forming device with temperature control function according to claim 5, characterized in that: The trimming mechanism comprises: A hollow tube (26), wherein the hollow tube (26) is symmetrically arranged and slidably sleeved on the surface of the transmission rod (21), and the hollow tube (26) is a structure with an outer circle and an inner square that matches the transmission rod (21); A cutting disc (27), wherein the cutting disc (27) is fixedly sleeved on the outer wall surface of the hollow tube (26).

8. A nickel strip hot rolling forming device with temperature control function according to claim 7, characterized in that: The regulating mechanism comprises: Slide plates (28), two symmetrically arranged slide plates (28) are slidably connected to the inner top surface of the fixing frame (7); A through slide groove (29), wherein the through slide groove (29) is formed through the slide plate (28); A connecting plate (30), the connecting plate (30) being sleeved on the outer wall surface of the hollow tube (26), the connecting plate (30) being bearing-connected to the hollow tube (26), and the connecting plate (30) being longitudinally slidably connected to the wall surface of the through slide groove (29); A second bidirectional screw rod (31), wherein a bearing of the second bidirectional screw rod (31) passes through the front side wall of the fixing frame (7), and the second bidirectional screw rod (31) passes through the slide plate (28), and the second bidirectional screw rod (31) is threadedly connected to the slide plate (28), and the rear end of the second bidirectional screw rod (31) is connected to the bearing of the rear inner wall surface of the fixing frame (7); A second rotating wheel (32), the second rotating wheel (32) is coaxially fixedly mounted on the front end of the second bidirectional screw rod (31).

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