Correcting tool for long and thin forgings
By using a transmission mechanism driven by a rotary motor and a moving motor, the slender forgings can be fixed and their position adjusted, solving the problem of displacement of the forgings during the straightening process and improving the straightening accuracy and efficiency.
Patent Information
- Application Number
- CN202423000965.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing straightening fixtures for slender forgings are prone to displacement due to deformation pressure during the straightening process, resulting in straightening errors and affecting straightening efficiency.
A rotating motor drives a rotating threaded rod to move the straightening plate downwards. The forging is fixed and straightened by the meshing action of the transmission mechanism. The position of the forging is adjusted by a moving motor to prevent displacement of the forging.
It effectively prevents the forging from shifting during the straightening process, improves straightening accuracy and efficiency, and ensures that the deformed parts of the forging are correctly straightened.
Smart Images
Figure CN223465816U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile parts, in particular to a slender forge piece correction frock. BACKGROUND
[0002] The forge piece is the workpiece or blank obtained by plastic deformation of the metal blank through the forging process, the forging is a kind of forging pressure mechanical to metal blank and is subjected to pressure, makes its plastic deformation, so that the mechanical performance, certain shape and size of the forge piece are obtained, in the forging process, the microstructure of metal is optimized, and the defects such as cast loose are eliminated, and the complete metal flow line is preserved, so the mechanical performance of the forge piece is usually better than that of the casting of the same material, and the slender forge piece produced by forging will appear deformation, at this time, the slender forge piece needs to be corrected.
[0003] At present, most slender forge piece correction frocks on the market extrude the forge piece through the correction plate descending on the top, so as to achieve the function of deformation correction, and the forge piece is easily caused to displace due to the deformation in the correction process, finally causes correction failure, and influences correction efficiency. SUMMARY
[0004] The utility model discloses a kind of slender forge piece correction frock, to solve the problem that forge piece is easily caused to displace due to the deformation in the correction process in the above background, finally causes correction failure, and influences correction efficiency. To achieve the above purpose, the utility model provides the following technical scheme: a kind of slender forge piece correction frock, including pedestal, the right side of the front of the pedestal is fixedly connected with the left side of moving mechanism, the outer wall of the moving mechanism is threadedly connected with the inner wall of fixed mechanism, the inner wall of fixed mechanism is movably connected with the outer wall of the bottom of rotating mechanism, the rotating mechanism is composed of rotating motor, rotating threaded rod, rotating threaded tube and correction plate;
[0005] The back of the rotating mechanism is movably connected with the front of transmission mechanism, the transmission mechanism includes transmission toothed plate, transmission toothed rod, transmission rod, moving toothed plate and moving stop plate, the bottom of the transmission mechanism is slidably connected with the top of pedestal, the outer wall of the transmission mechanism is slidably connected with the inner wall of connecting mechanism, the connecting mechanism is composed of two connecting fixed blocks, moving limiting rod and two moving limiting plates, the bottom of the connecting mechanism is fixedly connected with the top of the back of pedestal.
[0006] Preferably, the pedestal includes four stand columns, operation base plate, fixed base plate and forge piece body, the top of four stand columns is fixedly connected with the bottom of operation base plate, and four stand columns are distributed in rectangular array about the center of operation base plate bottom, the top of operation base plate middle part is fixedly connected with the bottom of fixed base plate, and the top of fixed base plate middle part is movably abutted with the bottom of forge piece body.
[0007] Preferably, the moving mechanism is composed of a moving base, a moving motor, a moving threaded rod, two moving fixed blocks and two fixed baffle plates, the left side of the moving base is fixedly connected with the right side of the front face of the operation base plate, and the top of the moving base is movably connected with the bottom of the moving motor, one end of the moving motor is fixedly connected with one end of the moving threaded rod through a shaft coupling, and the outer walls at both ends of the moving threaded rod are rotatably connected with the inner walls of the two moving fixed blocks, and the tops of the two moving fixed blocks are movably connected with the bottoms of the two fixed baffle plates.
[0008] Preferably, the fixing mechanism comprises two fixed support plates, a fixed cross beam and two motor mounting seats, the left side of one of the fixed support plates close to the bottom is provided with a supporting threaded hole, the inner wall of the supporting threaded hole is threadedly connected with the outer wall of the middle part of the moving threaded rod, the top of each of the two fixed support plates is fixedly connected with the bottom of the front face and the bottom of the back face of the fixed cross beam, and the top of the middle part of the fixed cross beam is fixedly connected with the bottom of each of the two motor mounting seats, the top of the middle part of the fixed cross beam is provided with a rotating through hole, the left side of the other fixed support plate close to the front face of the bottom is provided with a transmission through hole, and the left side of the fixed support plate close to the back face of the bottom is provided with a limiting through hole.
[0009] Preferably, the outer side walls of the bottom of the rotating motor are movably connected with the opposite sides of the two motor mounting seats, respectively, and the bottom end of the rotating motor is fixedly connected with the top end of the rotating threaded rod through a shaft coupling, the outer wall of the bottom end of the rotating threaded rod is threadedly connected with the inner wall of the rotating threaded tube, the bottom of the rotating threaded tube is movably connected with the top of the middle part of the correction plate, the front face and the back face of the correction plate are slidably connected with the opposite sides of the two fixed support plates, respectively, and the outer wall of the top of the rotating threaded rod is rotatably connected with the inner wall of the rotating through hole.
[0010] Preferably, the front face of the transmission toothed plate is movably connected with the back face of the correction plate, the back face of the transmission toothed plate is meshingly connected with the outer side walls of the transmission toothed rod, the inner wall of the transmission toothed rod is movably connected with the outer wall of the middle part of the transmission rod, the outer side walls close to the two ends of the transmission toothed rod are meshingly connected with the bottoms of the two moving toothed plates, respectively, the front faces of the two moving toothed plates are movably connected with the back faces of the two moving resistance plates, respectively, the bottoms of the two moving resistance plates are slidably connected with the tops of the two sides of the fixed base plate, respectively, and the outer wall of the middle part of the transmission toothed rod is rotatably connected with the inner wall of the transmission through hole.
[0011] Preferably, two mobile through holes are arranged on the left side of the back of the two connecting fixed blocks, and the inner walls of the two mobile through holes are movably connected with the outer walls of the two ends of the movement limiting rod; the top of the front of the two connecting fixed blocks is fixedly connected with the bottom of the two movement limiting plates respectively, and the inner walls of the two movement limiting plates are slidably connected with the outer walls of the two movement tooth plates respectively; two connecting through holes are arranged on the left side of the top of the front of the two connecting fixed blocks respectively, and the inner walls of the two connecting through holes are rotatably connected with the outer walls of the two ends of the transmission rod respectively; the bottom of the two connecting fixed blocks is fixedly connected with the top of the back of the operation bottom plate respectively, and the outer wall of the movement limiting rod is movably sleeved with the inner wall of the limiting through hole.
[0012] Compared with the prior art, the utility model has the advantages of:
[0013] In the utility model, through starting rotation motor, rotation motor drives rotation screw rod to rotate, rotation screw rod rotates and drives fixed support plate's limiting action through screw action and moves down rotation screw tube, rotation screw tube moves down and drives correction plate to move down, correction plate moves down and drives transmission tooth plate to move down, and transmission tooth plate moves down drives transmission tooth rod to rotate around transmission rod through meshing action, transmission tooth rod rotates and drives movement tooth plate to move linearly through meshing action, movement tooth plate moves linearly and drives movement resisting plate to move linearly, and movement resisting plate moves linearly can resist and fix forge piece body, avoids displacement of forge piece body in the process of correction, so as to cause correction failure.
[0014] In the utility model, rotation screw tube moves down and drives correction plate to move down, and correction plate moves down can extrude the top of forge piece body, and the deformed part of forge piece body can be corrected through extrusion.
[0015] In the utility model, starting movement motor, rotation motor drives movement screw rod to rotate, movement screw rod rotates and drives fixed support plate to move linearly through screw action, fixed support plate moves linearly and can adjust correction position, and it is convenient to correct different positions of forge piece body. ACCURATE DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the sectional view of the utility model;
[0017] Figure 2 It is the whole structure schematic view of the utility model;
[0018] Figure 3 It is the explosion drawing of the utility model;
[0019] Figure 4 It is the explosion drawing of fixed mechanism and rotation mechanism in the utility model;
[0020] Figure 5The explosion map of the transmission mechanism and the connecting mechanism in the utility model.
[0021] In the drawing: 1, base; 101, stand; 102, operation bottom plate; 103, fixed bottom plate; 104, forge body; 2, moving mechanism; 201, moving base; 202, moving motor; 203, moving threaded rod; 204, moving fixed block; 205, fixed baffle; 3, fixed mechanism; 301, fixed support plate; 302, fixed crossbeam; 303, motor mounting seat; 4, rotating mechanism; 401, rotating motor; 402, rotating threaded rod; 403, rotating threaded tube; 404, correction plate; 5, transmission mechanism; 501, transmission toothed plate; 502, transmission toothed rod; 503, transmission rod; 504, moving toothed plate; 505, moving stop plate; 6, connecting mechanism; 601, connecting fixed block; 602, moving limiting rod; 603, moving limiting plate. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary technical personnel in the field without creative work belong to the range protected by the utility model.
[0023] Please refer to Figures 1 to 5 The utility model provides a kind of technical solutions: a kind of slender forge correction tool, including base 1, the right side of the front of base 1 is fixedly connected with the left side of moving mechanism 2, the outer wall of moving mechanism 2 is threadedly connected with the inner wall of fixed mechanism 3, the inner wall of fixed mechanism 3 is movably clamped with the outer wall of rotating mechanism 4 bottom, rotating mechanism 4 is composed of rotating motor 401, rotating threaded rod 402, rotating threaded tube 403 and correction plate 404;
[0024] The back of rotating mechanism 4 is movably clamped with the front of transmission mechanism 5, and transmission mechanism 5 includes transmission toothed plate 501, transmission toothed rod 502, transmission rod 503, moving toothed plate 504 and moving stop plate 505, the bottom of transmission mechanism 5 is slidably connected with the top of base 1, the outer wall of transmission mechanism 5 is slidably connected with the inner wall of connecting mechanism 6, connecting mechanism 6 is composed of two connecting fixed blocks 601, moving limiting rod 602 and two moving limiting plates 603, the bottom of connecting mechanism 6 is fixedly connected with the top of the back of base 1.
[0025] In the embodiment, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 And Figure 5As shown, the base 1 includes four columns 101, an operating bottom plate 102, a fixed bottom plate 103 and a forging body 104, the top of each of the four columns 101 is fixedly connected with the bottom of the operating bottom plate 102, and the four columns 101 are distributed in a rectangular array about the center of the bottom of the operating bottom plate 102, the top of the middle of the operating bottom plate 102 is fixedly connected with the bottom of the fixed bottom plate 103, and the top of the middle of the fixed bottom plate 103 is movably abutted with the bottom of the forging body 104, and the column 101 can keep the device stable during the working process.
[0026] In the embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the moving mechanism 2 is composed of a moving base 201, a moving motor 202, a moving threaded rod 203, two moving fixed blocks 204 and two fixed baffles 205, the left side of the moving base 201 is fixedly connected with the right side of the front of the operating bottom plate 102, and the top of the moving base 201 is movably clamped with the bottom of the moving motor 202, one end of the moving motor 202 is fixedly connected with one end of the moving threaded rod 203 through a shaft coupling, and the outer walls of the two ends of the moving threaded rod 203 are rotatably connected with the inner walls of the two moving fixed blocks 204, and the tops of the two moving fixed blocks 204 are movably clamped with the bottoms of the two fixed baffles 205, and the moving motor 202 is started, and the rotating moving motor 202 drives the moving threaded rod 203 to rotate.
[0027] In the embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the fixing mechanism 3 includes two fixed support plates 301, a fixed cross beam 302 and two motor mounting seats 303, one of the two fixed support plates 301 is provided with a support threaded hole near the left side of the bottom, the inner wall of the support threaded hole is threadedly connected with the outer wall of the middle of the moving threaded rod 203, the tops of the two fixed support plates 301 are fixedly connected with the bottom of the front and the bottom of the back of the fixed cross beam 302 respectively, the top of the middle of the fixed cross beam 302 is fixedly connected with the bottom of the two motor mounting seats 303 respectively, the top of the middle of the fixed cross beam 302 is provided with a rotating through hole, and the other fixed support plate 301 is provided with a transmission through hole near the left side of the front of the bottom, and the fixed support plate 301 is provided with a limiting through hole near the left side of the back of the bottom, the moving threaded rod 203 rotates to drive the fixed support plate 301 to move linearly through the threaded action, the linear movement of the fixed support plate 301 can adjust and correct the position, so as to facilitate the correction of different positions of the forging body 104.
[0028] In the embodiment, as shown in Figure 1 , Figure 2 ,Figure 3 、 Figure 4 and Figure 5 As shown in FIGS. 1-4, the outer wall of the bottom of the rotating motor 401 is movably connected to the side opposite to the two motor mounting seats 303, and the bottom end of the rotating motor 401 is fixedly connected to the top end of the rotating threaded rod 402 through a shaft coupling, the outer wall of the bottom end of the rotating threaded rod 402 is threadedly connected to the inner wall of the rotating threaded tube 403, and the bottom of the rotating threaded tube 403 is movably connected to the top of the middle part of the correction plate 404. The front surface and the back surface of the correction plate 404 are movably connected to the sides opposite to the two fixed support plates 301, respectively, and the outer wall of the top of the rotating threaded rod 402 is rotatably connected to the inner wall of the rotating through hole. When the rotating motor 401 is started, the rotating rotating motor 401 drives the rotating threaded rod 402 to rotate, the rotating threaded rod 402 rotates to drive the rotating threaded tube 403 to move downward through the thread effect and the limiting effect of the fixed support plate 301, the rotating threaded tube 403 moves downward to drive the correction plate 404 to move downward, the downward movement of the correction plate 404 can extrude the top of the forge body 104, and the deformation of the forge body 104 can be corrected through extrusion.
[0029] In this embodiment, as shown in FIGS. 1-4, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The front surface of the transmission tooth plate 501 is movably connected to the back surface of the correction plate 404, and the back surface of the transmission tooth plate 501 is meshingly connected to the outer side wall of the transmission tooth rod 502. The inner wall of the transmission tooth rod 502 is movably connected to the outer wall of the middle part of the transmission rod 503, and the outer side walls close to the two ends of the transmission tooth rod 502 are meshingly connected to the bottoms of the two moving tooth plates 504, respectively. The front surfaces of the two moving tooth plates 504 are movably connected to the back surfaces of the two moving resistance plates 505, respectively, and the bottoms of the two moving resistance plates 505 are movably connected to the tops of the two sides of the fixed bottom plate 103, respectively. The outer wall of the middle part of the transmission tooth rod 502 is rotatably connected to the inner wall of the transmission through hole. The downward movement of the correction plate 404 drives the downward movement of the transmission tooth plate 501, the downward movement of the transmission tooth plate 501 drives the transmission tooth rod 502 to rotate around the transmission rod 503 through the meshing effect, the rotation of the transmission tooth rod 502 drives the straight-line movement of the moving tooth plate 504 through the meshing effect, the straight-line movement of the moving tooth plate 504 drives the straight-line movement of the moving resistance plate 505, and the straight-line movement of the moving resistance plate 505 can resist and fix the forge body 104, so as to avoid the displacement of the forge body 104 in the correction process, thereby avoiding the failure of correction.
[0030] In this embodiment, as shown in FIGS. 1-4, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, two connecting fixed blocks 601 are provided with moving through holes near the left side of the back, and the inner walls of the two moving through holes are movably connected with the outer walls of the two ends of the moving limiting rod 602, the top of the front of the two connecting fixed blocks 601 is fixedly connected with the bottom of the two moving limiting plates 603 respectively, and the inner walls of the two moving limiting plates 603 are slidably connected with the outer walls of the two moving toothed plates 504 respectively, the left side of the top of the front of the two connecting fixed blocks 601 is provided with a connecting through hole respectively, and the inner walls of the two connecting through holes are rotatably connected with the outer walls of the two ends of the transmission rod 503 respectively, the bottom of the two connecting fixed blocks 601 is fixedly connected with the top of the back of the operation bottom plate 102 respectively, and the outer wall of the moving limiting rod 602 is movably sleeved with the inner wall of the limiting through hole.
[0031] The use method and advantages of the utility model are as follows:
[0032] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 , by starting the rotating motor 401, the rotating rotating motor 401 drives the rotating threaded rod 402 to rotate, the rotating threaded rod 402 rotates and drives the rotating threaded pipe 403 to move downward through the limiting action of the fixed support plate 301, the rotating threaded pipe 403 moves downward and drives the correction plate 404 to move downward, the downward movement of the correction plate 404 can extrude the top of the forge piece body 104, and the deformed part of the forge piece body 104 can be corrected through extrusion, the downward movement of the correction plate 404 drives the transmission toothed plate 501 to move downward, the downward movement of the transmission toothed plate 501 drives the transmission toothed rod 502 to rotate around the transmission rod 503 through the meshing action, the transmission toothed rod 502 rotates and drives the moving toothed plate 504 to move linearly through the meshing action, the moving toothed plate 504 moves linearly and drives the moving abutting plate 505 to move linearly, the linear movement of the moving abutting plate 505 can abut and fix the forge piece body 104, so as to avoid displacement of the forge piece body 104 during correction, thereby causing correction failure, the moving motor 202 is started, the rotating moving motor 202 drives the moving threaded rod 203 to rotate, the moving threaded rod 203 rotates and drives the fixed support plate 301 to move linearly through the threaded action, the linear movement of the fixed support plate 301 can adjust the correction position, so as to facilitate correction of different positions of the forge piece body 104.
[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. An elongated forging correction tooling comprising a base (1), characterized in that: The right side of the front of the base (1) is fixedly connected with the left side of the moving mechanism (2), the outer wall of the moving mechanism (2) is threadedly connected with the inner wall of the fixing mechanism (3), the inner wall of the fixing mechanism (3) is movably clamped with the outer wall of the bottom of the rotating mechanism (4), and the rotating mechanism (4) is composed of a rotating motor (401), a rotating threaded rod (402), a rotating threaded tube (403) and a correction plate (404). The back of the rotating mechanism (4) is movably clamped with the front of the transmission mechanism (5), the transmission mechanism (5) comprises a transmission toothed plate (501), a transmission toothed rod (502), a transmission rod (503), a moving toothed plate (504) and a moving stop plate (505), the bottom of the transmission mechanism (5) is slidably connected with the top of the base (1), the outer wall of the transmission mechanism (5) is slidably connected with the inner wall of the connecting mechanism (6), the connecting mechanism (6) is composed of two connecting fixed blocks (601), a moving limiting rod (602) and two moving limiting plates (603), and the bottom of the connecting mechanism (6) is fixedly connected with the top of the back of the base (1).
2. An elongated forge piece correction tool as defined in claim 1, wherein: The base (1) comprises four stand columns (101), an operation bottom plate (102), a fixed bottom plate (103) and a forged body (104), the top of each of the four stand columns (101) is fixedly connected with the bottom of the operation bottom plate (102), the four stand columns (101) are arranged in a rectangular array about the center of the bottom of the operation bottom plate (102), the top of the middle portion of the operation bottom plate (102) is fixedly connected with the bottom of the fixed bottom plate (103), and the top of the middle portion of the fixed bottom plate (103) is movably abutted with the bottom of the forged body (104).
3. An elongated forge piece correction tool as defined in claim 2, wherein: The moving mechanism (2) is composed of a moving base (201), a moving motor (202), a moving threaded rod (203), two moving fixed blocks (204) and two fixed baffle plates (205), the left side of the moving base (201) is fixedly connected with the right side of the front of the operation bottom plate (102), the top of the moving base (201) is movably clamped with the bottom of the moving motor (202), one end of the moving motor (202) is fixedly connected with one end of the moving threaded rod (203) through a shaft coupling, the outer walls of the two ends of the moving threaded rod (203) are rotatably connected with the inner walls of the two moving fixed blocks (204), respectively, and the tops of the two moving fixed blocks (204) are movably clamped with the bottoms of the two fixed baffle plates (205), respectively.
4. An elongated forge piece correction tool as defined in claim 3, wherein: The fixed mechanism (3) comprises two fixed support plates (301), a fixed cross beam (302) and two motor mounting seats (303), one of the fixed support plates (301) is provided with a supporting threaded hole near the left side of the bottom, and the inner wall of the supporting threaded hole is threadedly connected with the outer wall of the middle part of the moving threaded rod (203), the top of the two fixed support plates (301) is fixedly connected with the bottom of the front face and the bottom of the back face of the fixed cross beam (302) respectively, and the top of the middle part of the fixed cross beam (302) is fixedly connected with the bottom of the two motor mounting seats (303) respectively, the top of the middle part of the fixed cross beam (302) is provided with a rotating through hole, and the other fixed support plate (301) is provided with a transmission through hole near the left side of the front face of the bottom, and the fixed support plate (301) is provided with a limiting through hole near the left side of the back face of the bottom.
5. An elongated forge piece correction tool as defined in claim 4, wherein: The outer side wall of the bottom of the rotating motor (401) is movably clamped on the opposite side of the two motor mounting seats (303) respectively, and the bottom end of the rotating motor (401) is fixedly connected with the top end of the rotating threaded rod (402) through a shaft coupling, the outer wall of the bottom end of the rotating threaded rod (402) is threadedly connected with the inner wall of the rotating threaded tube (403), and the bottom of the rotating threaded tube (403) is movably clamped with the top of the middle part of the correcting plate (404), the front face and the back face of the correcting plate (404) are slidably connected with the opposite side of the two fixed support plates (301) respectively, and the outer wall of the top of the rotating threaded rod (402) is rotatably connected with the inner wall of the rotating through hole.
6. An elongated wrought correction tooling as defined in claim 5, wherein: The front face of the transmission toothed plate (501) is movably clamped with the back face of the correcting plate (404), and the back face of the transmission toothed plate (501) is meshedly connected with the outer side wall of the transmission toothed rod (502), the inner wall of the transmission toothed rod (502) is movably clamped with the outer wall of the middle part of the transmission rod (503), and the outer side walls near the two ends of the transmission toothed rod (502) are meshedly connected with the bottoms of the two moving toothed plates (504) respectively, the front faces of the two moving toothed plates (504) are movably clamped with the back faces of the two moving resisting plates (505) respectively, and the bottoms of the two moving resisting plates (505) are slidably connected with the tops of the two sides of the fixed bottom plate (103) respectively, and the outer wall of the middle part of the transmission toothed rod (502) is rotatably connected with the inner wall of the transmission through hole.
7. An elongated forge piece correction tool as defined in claim 6, wherein: Both the connecting fixed blocks (601) are provided with moving through holes near the left side of the back, the inner walls of the two moving through holes are movably connected with the outer walls of the two ends of the moving limiting rod (602), the top parts of the front faces of the two connecting fixed blocks (601) are fixedly connected with the bottoms of the two moving limiting plates (603), the inner walls of the two moving limiting plates (603) are slidably connected with the outer walls of the two moving toothed plates (504) respectively, the left sides of the top front faces of the two connecting fixed blocks (601) are provided with connecting through holes respectively, the inner walls of the two connecting through holes are rotatably connected with the outer walls of the two ends of the transmission rod (503) respectively, the bottoms of the two connecting fixed blocks (601) are fixedly connected with the top part of the back face of the operation bottom plate (102) respectively, and the outer wall of the moving limiting rod (602) movably sleeves the inner wall of the limiting through hole.