High-efficiency steel bar cutting device

Abstract

This utility model belongs to the technical field of high-efficiency rebar cutting equipment, specifically a high-efficiency rebar cutting device, including a support frame. The support frame contains a cutting clamping and positioning mechanism and a driving cutting mechanism, located to the left of the cutting clamping and positioning mechanism. The cutting clamping and positioning mechanism performs the clamping and positioning action during rebar cutting. This high-efficiency rebar cutting device is ingeniously designed, integrating pneumatic clamping and mechanical driving cutting systems. Its symmetrically arranged U-shaped clamping seats, driven by synchronous pneumatic pressure, can achieve uniform and reliable clamping of the rebar, effectively preventing bending or uneven stress on the rebar, and the clamping force can be adjusted to accommodate different rebar types. The inclined clamping rod design allows the pneumatic pressure to more effectively push the rebar against the clamping wall, and with spring return, it achieves rapid and automatic clamping and releasing. Furthermore, the exhaust valve further accelerates the releasing speed, significantly improving work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of high-efficiency rebar cutting equipment, and in particular to a high-efficiency rebar cutting equipment. Background Technology

[0002] In the fields of rebar processing and construction, traditional high-efficiency rebar cutting equipment generally suffers from several technical bottlenecks. First, existing clamping and positioning methods, such as manual clamping or simple mechanical positioning, often result in uneven clamping force distribution or insufficient positioning accuracy. This causes the rebar to easily shift and wobble during cutting, severely affecting the flatness and dimensional accuracy of the cut end, making it difficult to meet the demands of high-precision processing. Second, relying on manual clamping is not only labor-intensive and inefficient, but also makes it difficult to ensure consistency in each operation, limiting the improvement of production efficiency. Third, traditional equipment generally has a low degree of automation, requiring significant manual intervention, which cannot meet the efficiency requirements of modern, large-scale production. Furthermore, unstable clamping also brings safety hazards, such as rebar splashing, and affects the stability and reliability of equipment operation. Therefore, a high-efficiency rebar cutting device is needed. Utility Model Content

[0003] Based on the existing technical problems, this utility model proposes a high-efficiency steel bar cutting device.

[0004] This utility model proposes a high-efficiency rebar cutting device, including a support frame. The support frame is equipped with a cutting clamping and positioning mechanism and a driving cutting mechanism. The driving cutting mechanism is located to the left of the cutting clamping and positioning mechanism. The cutting clamping and positioning mechanism realizes the clamping and positioning action in the rebar cutting operation.

[0005] The drive cutting mechanism includes a main cutter, which realizes the reciprocating cutting action of the main cutter.

[0006] Preferably, the cutting clamping and positioning mechanism includes a vertical plate, the surface of which is fixedly installed to the right side surface of the support frame, an air inlet pipe is fixedly installed on the surface of the vertical plate, an air inlet valve is fixedly installed at the right end of the air inlet pipe, and air inlet drive pipes are fixedly installed at both air inlet ends on the left end of the air inlet pipe. A U-shaped clamping seat is fixedly installed on the top of the right end of the support frame, and the two U-shaped clamping seats are symmetrically arranged inside the support frame, with the reinforcing bars located inside the two U-shaped clamping seats.

[0007] Preferably, the right end of the U-shaped clamping seat is fixedly installed with the left end of the intake drive pipe. The right end surface of the U-shaped clamping seat is also provided with a drive groove. The inner wall of the drive groove is fixedly connected to the inner wall of the intake drive pipe. A clamping rod is slidably inserted into the inner wall of the left end of the drive groove. A pneumatic piston is fixedly installed at the right end of the clamping rod. The four sides of the pneumatic piston are sealed and slidably sealed with the inner wall of the drive groove through sealing rings. A spring is also fixedly installed on the left side of the pneumatic piston. One end of the spring is fixedly installed with the inner wall of the drive groove. The left end of the clamping rod is inclined.

[0008] Preferably, a fixing seat is fixedly installed on the top surface of the left end of the upright plate, and an auxiliary cutter is fixedly installed on the left end of the fixing seat. The auxiliary cutter is arranged in correspondence with the main cutter to realize the cutting operation. An exhaust pipe is fixedly installed on the top of each of the two air intake drive pipes, and an exhaust valve is fixedly installed on the surface of the exhaust pipe.

[0009] Preferably, the drive cutting mechanism includes a motor base, the mounting bottom of which is fixedly installed to the left bottom frame surface of the support frame. The frame surface of the support frame is also fixedly installed with bearing seats and tensioning columns. The six bearing seats are arranged in three groups. The opposing surfaces of the bearing seats in the first group are rotatably connected to pulley shafts through bearings. A drive motor is fixedly installed on the top of the motor base. The output end of the drive motor is connected to a drive pulley through a coupling. A driven pulley is fixedly installed on one end of the pulley shaft. The grooves of the drive pulley and the grooves of the driven pulley are both connected to belts.

[0010] A connecting seat is slidably mounted on the surface of the tensioning column. A rotating shaft is rotatably connected to the surface of the connecting seat via a bearing. A tensioning wheel is fixedly mounted on one end of the rotating shaft. The surface of the tensioning wheel is connected to a belt for transmission.

[0011] Preferably, the opposing surfaces of the bearing seats in the second group are rotatably connected to a linkage gear shaft via bearings, and a linkage gear is fixedly installed on the arc surface of the linkage gear shaft. The teeth of the linkage gear mesh with the tooth grooves on the surface of the rotating shaft. The opposing surfaces of the bearing seats in the third group are rotatably connected to an eccentric shaft via bearings, and a driven gear is fixedly installed on the arc surface of the eccentric shaft. The teeth of the driven gear mesh with the tooth grooves of the linkage gear shaft.

[0012] Preferably, a push rod is rotatably connected to the arc surface of the eccentric shaft via a bearing, one end of the push rod is rotatably connected to a sliding rod via a pin, a fixed sleeve is slidably inserted into the surface of the sliding rod, the bottom of the fixed sleeve is fixedly installed to the frame surface of the support frame, and one end of the sliding rod is fixedly installed to the mounting surface of the main cutter.

[0013] The beneficial effects of this utility model are as follows:

[0014] This high-efficiency rebar cutting equipment features a sophisticated design, integrating pneumatic clamping and mechanical drive cutting systems. Its symmetrically arranged U-shaped clamping seats, driven by synchronized pneumatic pressure, ensure uniform and reliable clamping of the rebar, effectively preventing bending or uneven stress. The clamping force is adjustable to accommodate different types of rebar. The inclined clamping rod design allows the pneumatic pressure to more effectively push the rebar against the clamping wall, and combined with spring return, achieves rapid and automatic clamping and releasing. Furthermore, the exhaust valve further accelerates the releasing speed, significantly improving work efficiency.

[0015] For cutting, the motor provides power via belt drive, and the tensioner mechanism ensures long-term belt tension, guaranteeing smooth and reliable power transmission. The transmission system, consisting of a linkage gear shaft, eccentric shaft, and driven gear, efficiently converts rotary motion into precise reciprocating motion. Finally, a linkage mechanism comprising a push rod, sliding rod, and fixed sleeve ensures stable, linear movement and precise cutting when the main and auxiliary cutters work together. The overall design achieves efficient, precise, safe, and reliable rebar cutting operations. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a high-efficiency rebar cutting device;

[0017] Figure 2 A three-dimensional diagram of the belt structure of a high-efficiency rebar cutting device;

[0018] Figure 3 A three-dimensional view of the support frame structure of a high-efficiency rebar cutting device;

[0019] Figure 4 A perspective view of the drive cutting mechanism of a high-efficiency rebar cutting device;

[0020] Figure 5 A perspective view of the cutting, clamping, and positioning mechanism of a high-efficiency rebar cutting device;

[0021] Figure 6 A three-dimensional sectional view of the drive groove structure of a high-efficiency rebar cutting device;

[0022] Figure 7 This is a three-dimensional diagram of the mounting base structure of a high-efficiency rebar cutting device.

[0023] In the diagram: 1. Support frame; 2. Cutting clamping and positioning mechanism; 21. Vertical plate; 22. Air inlet pipe; 23. Air inlet valve; 24. Air inlet drive pipe; 25. U-shaped clamping seat; 26. Drive groove; 27. Clamping rod; 28. Pneumatic piston; 29. ​​Spring; 210. Fixed seat; 211. Auxiliary cutter; 212. Exhaust pipe; 213. Exhaust valve; 3. Drive cutting mechanism; 31. Main cutter; 32. 33. Motor base; 34. Bearing housing; 35. Tensioning column; 36. Pulley shaft; 37. Drive motor; 38. Drive pulley; 39. Driven pulley; 30. Belt; 310. Connecting seat; 311. Rotating shaft; 312. Tensioning wheel; 313. Linkage gear shaft; 314. Linkage gear; 315. Eccentric shaft; 316. Driven gear; 317. Push rod; 318. Sliding rod; 319. Fixed sliding sleeve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-7 A high-efficiency rebar cutting device includes a support frame 1. Inside the support frame 1 are a cutting clamping and positioning mechanism 2 and a driving cutting mechanism 3. The driving cutting mechanism 3 is located to the left of the cutting clamping and positioning mechanism 2. The cutting clamping and positioning mechanism 2 performs clamping and positioning actions during rebar cutting. The cutting clamping and positioning mechanism 2 includes a vertical plate 21. The surface of the vertical plate 21 is fixedly installed to the right side surface of the support frame 1. An air inlet pipe 22 is fixedly installed on the surface of the vertical plate 21. An air inlet valve 23 is fixedly installed at the right end of the air inlet pipe 22. Air inlet drive pipes 24 are fixedly installed at both air inlet ends on the left end of the air inlet pipe 22. A U-shaped clamping seat 25 is fixedly installed on the top of the right side of the support frame 1. The two U-shaped clamping seats 25 are symmetrically arranged inside the support frame 1, and the rebar is located inside the two U-shaped clamping seats 25. The air inlet end of the air inlet pipe 22 is connected to the air outlet end of an air pump. The air inlet operation is achieved by opening or closing the air inlet valve 23.

[0026] Specifically, this is achieved by using two symmetrical U-shaped clamping seats 25, controlled by synchronized air intake drive pipes 24, which simultaneously and evenly apply clamping force to both ends of the cut rebar. This avoids the bending or uneven stress that may occur with unilateral clamping, ensuring a smooth and reliable clamping process. The pneumatic system can control the clamping force by adjusting the air intake pressure. The symmetrical arrangement allows for unified adjustment of the force at both clamping points, enabling the adjustment of appropriate clamping force according to different diameters or materials of rebar, ensuring both secure clamping and preventing damage to the rebar.

[0027] The right end of the U-shaped clamping seat 25 is fixedly installed with the left end of the intake drive pipe 24. The right end surface of the U-shaped clamping seat 25 is also provided with a drive groove 26. The inner wall of the drive groove 26 is fixedly connected with the inner wall of the intake drive pipe 24. A clamping rod 27 is slidably inserted into the inner wall of the left end of the drive groove 26. A pneumatic piston 28 is fixedly installed at the right end of the clamping rod 27. The four sides of the pneumatic piston 28 are sealed and slidably sealed with the inner wall of the drive groove 26 through sealing rings. A spring 29 is also fixedly installed on the left side of the pneumatic piston 28. One end of the spring 29 is fixedly installed with the inner wall of the drive groove 26. The left end of the clamping rod 27 is inclined.

[0028] Specifically, when air pressure enters from the intake drive pipe 24, the air pressure acts on the air pressure piston 28, overcoming the elastic force of the spring 29 and pushing the clamping rod 27 to the left. Since the left end of the clamping rod 27 is inclined, it reliably pushes the steel bar against the inner wall of the U-shaped clamping seat 25, achieving clamping. During disassembly, the control air pressure disappears, and the spring 29 pushes the clamping rod 27 to return to its original position.

[0029] A mounting base 210 is fixedly installed on the top surface of the left end of the upright plate 21. An auxiliary cutter 211 is fixedly installed on the left end of the mounting base 210. The auxiliary cutter 211 is set in a corresponding manner with the main cutter 31 to realize the cutting operation. An exhaust pipe 212 is fixedly installed on the top of each of the two air intake drive pipes 24. An exhaust valve 213 is fixedly installed on the surface of the exhaust pipe 212.

[0030] Specifically, the auxiliary cutter 211 and the main cutter 31 together form the cutting edge for shearing the reinforcing bar. After the reinforcing bar is fixed by the clamping mechanism, the main cutter 31 moves under the action of the drive mechanism, cooperating with the stationary auxiliary cutter 211 to shear the reinforcing bar located between them. The air intake drive pipe 24 provides power to the clamping mechanism, while the exhaust pipe 212 is used to control the exhaust valve 213 to open and quickly discharge the compressed air in the drive groove 26 when it is necessary to loosen the reinforcing bar. This greatly speeds up the reset speed of the clamping mechanism, thereby shortening the time of the entire work cycle and improving production efficiency.

[0031] The drive cutting mechanism 3 includes a main cutter 31, which realizes the reciprocating cutting action of the main cutter 31. The drive cutting mechanism 3 includes a motor base 32, the bottom of which is fixedly installed on the left bottom frame surface of the support frame 1. The support frame 1 also has bearing seats 33 and tensioning columns 34 fixedly installed on its frame surface. The six bearing seats 33 are arranged in three groups. The opposite surfaces of the first group of bearing seats 33 are rotatably connected to pulley shafts 35 through bearings. The top of the motor base 32 is fixedly installed with a drive motor 36. The output end of the drive motor 36 is connected to a drive pulley 37 through a coupling. One end of the pulley shaft 35 is fixedly installed with a driven pulley 38. The grooves of the drive pulley 37 and the driven pulley 38 are both connected to a belt 39.

[0032] Specifically, power is provided by an electric motor, and the flexibility, smoothness and overload protection of the belt 39 drive are utilized to efficiently transmit the power to the pulley shaft 35 through the drive pulley 37, causing the pulley shaft 35 to rotate.

[0033] A connecting seat 310 is slidably mounted on the surface of the tensioning column 34. A rotating shaft 311 is rotatably connected to the surface of the connecting seat 310 via a bearing. A tensioning wheel 312 is fixedly mounted on one end of the rotating shaft 311. The surface of the tensioning wheel 312 is connected to the belt 39 for transmission.

[0034] Specifically, as the service life increases, the belt 39 will undergo a certain degree of permanent elongation due to material fatigue and continuous stress. The tensioner 312 mechanism can easily compensate for this elongation by moving the connecting seat 310 and the tensioner 312 downward to re-tension the belt 39, thereby extending the service life of the belt 39.

[0035] The opposing surfaces of the second set of bearing housings 33 are rotatably connected to a linkage gear shaft 313 via bearings. A linkage gear 314 is fixedly installed on the arc surface of the linkage gear shaft 313. The teeth of the linkage gear 314 mesh with the tooth grooves on the surface of the rotating shaft 311. The opposing surfaces of the third set of bearing housings 33 are rotatably connected to an eccentric shaft 315 via bearings. A driven gear 316 is fixedly installed on the arc surface of the eccentric shaft 315. The teeth of the driven gear 316 mesh with the tooth grooves on the linkage gear shaft 313.

[0036] Specifically, this is achieved through a transmission system composed of a linkage gear shaft 313, a linkage gear 314, an eccentric shaft 315, and a driven gear 316. This system is the core mechanism of the high-efficiency rebar cutting equipment, which precisely and efficiently converts the motor's rotational power into the reciprocating motion of the cutting blade. It utilizes the advantages of gear transmission to ensure the reliability and accuracy of power transmission, and the ingenious design of the eccentric shaft 315 achieves the conversion from rotation to reciprocating motion, thereby driving the main cutting blade 31 to perform stable and controllable cutting operations.

[0037] The eccentric shaft 315 has a circular arc surface connected to a push rod 317 via a bearing. One end of the push rod 317 is connected to a sliding rod 318 via a pin. A fixed sleeve 319 is slidably inserted into the surface of the sliding rod 318. The bottom of the fixed sleeve 319 is fixedly installed on the surface of the support frame 1. One end of the sliding rod 318 is fixedly installed on the mounting surface of the main cutter 31.

[0038] Specifically, the sliding rod 318 slides within the fixed sleeve 319, providing precise guidance for the motion transmitted from the push rod 317. The fixed sleeve 319 is fixed to the support frame 1, ensuring that the sliding rod 318 can only move linearly in a fixed direction, thereby guaranteeing the linearity and stability of the main cutter 31's movement.

[0039] This high-efficiency rebar cutting equipment features a sophisticated design, integrating pneumatic clamping and mechanical drive cutting systems. Its symmetrically arranged U-shaped clamping seats 25, driven by synchronized pneumatic pressure, achieve uniform and reliable clamping of the rebar, effectively preventing bending or uneven stress. The clamping force is adjustable to accommodate different types of rebar. The inclined clamping rod 27 design allows the pneumatic pressure to more effectively push the rebar against the clamping wall, and with the spring 29 resetting, it achieves rapid and automatic clamping and releasing. Furthermore, the exhaust valve further accelerates the releasing speed, significantly improving work efficiency.

[0040] For cutting, the motor provides power via belt 39, and the tensioner 312 mechanism ensures that belt 39 is kept taut at all times, guaranteeing smooth and reliable power transmission. The transmission system, consisting of the linkage gear shaft 313, eccentric shaft 315, and driven gear 316, efficiently converts rotary motion into precise reciprocating motion. Finally, the linkage mechanism of push rod 317, sliding rod 318, and fixed sleeve 319 ensures stable and linear movement and precise cutting when the main cutter 31 and auxiliary cutter 211 are in operation. The overall design achieves efficient, precise, safe, and reliable rebar cutting operations.

[0041] Working principle: The operator places the rebar to be cut between the symmetrically arranged U-shaped clamping seats 25 on the right side of the support frame 1. Then, the air inlet valve 23 on the air inlet pipe 22 is opened, and compressed air from the air pump passes through the air inlet pipe 22, and then through the two air inlet drive pipes 24 into the drive grooves 26 inside the two U-shaped clamping seats 25. The air pressure pushes the air pressure piston 28 to overcome the elastic force of the spring 29, causing the clamping rod 27 to move to the left. Since the left end of the clamping rod 27 is inclined, its movement pushes the inner wall of the U-shaped clamping seat 25 outward, thereby firmly and evenly clamping the rebar. Closing the air inlet valve 23 maintains the clamping state.

[0042] When the drive motor 36 is started, the motor output shaft drives the drive pulley 37 to rotate. The drive pulley 37 transmits power to the driven pulley 38 via the belt 39, and the driven pulley 38 drives the pulley shaft 35 to rotate. The linkage gear 314 mounted on the pulley shaft 35 also rotates accordingly.

[0043] The rotation of the linkage gear 314 interacts with the driven gear 316 on its meshing eccentric shaft 315, driving the eccentric shaft 315 to rotate. The rotation of the eccentric shaft 315 drives the push rod 317 to move through the bearings on its arc surface. The other end of the push rod 317 is connected to the sliding rod 318 via a pin. Since the sliding rod 318 is constrained by the fixed sleeve 319 fixed on the support frame 1, it can only slide in a straight line. Therefore, the oscillation of the push rod 317 is converted into the reciprocating linear motion of the sliding rod 318.

[0044] The reciprocating motion of the sliding rod 318 directly drives the main cutter 31 to perform linear reciprocating motion. When the main cutter 31 reaches the end of its stroke, it meets the auxiliary cutter 211 fixed on the vertical plate 21, and together they cut the steel bar clamped in the U-shaped clamping seat 25 to complete the cutting action.

[0045] After cutting, the exhaust valve 213 is opened, and the compressed air in the drive groove 26 is quickly discharged. Under the action of the spring 29, the pneumatic piston 28 and the clamping rod 27 are reset, and the U-shaped clamping seat 25 releases the steel bar. The operator can then remove the cut steel bar and prepare for the next cutting cycle.

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

Claims

1. A high efficiency steel bar cutting device comprising a support frame (1), characterized in that: The support frame (1) is equipped with a cutting clamping and positioning mechanism (2) and a driving cutting mechanism (3) respectively. The driving cutting mechanism (3) is located on the left side of the cutting clamping and positioning mechanism (2). The cutting clamping and positioning mechanism (2) realizes the clamping and positioning action in the steel bar cutting operation. The cutting clamping and positioning mechanism (2) includes a vertical plate (21), an air inlet pipe (22) is fixedly installed on the surface of the vertical plate (21), an air inlet valve (23) is fixedly installed on the right end of the air inlet pipe (22), and air inlet drive pipes (24) are fixedly installed on both air inlet ends on the left end of the air inlet pipe (22). A U-shaped clamping seat (25) is fixedly installed on the top of the right end of the support frame (1). The right end surface of the U-shaped clamping seat (25) is also provided with a drive groove (26). A clamping rod (27) is slidably inserted into the inner wall of the left end of the drive groove (26). A pneumatic piston (28) is fixedly installed on the right end of the clamping rod (27). A spring (29) is fixedly installed on the left side of the pneumatic piston (28). A fixing seat (210) is fixedly installed on the top surface of the left end of the upright plate (21). An auxiliary cutter (211) is fixedly installed on the left end of the fixing seat (210). The drive cutting mechanism (3) includes a main cutter (31), which realizes the reciprocating cutting action of the main cutter (31).

2. The high efficiency rebar cutting apparatus of claim 1, wherein: The surface of the upright plate (21) is fixedly installed on the right side surface of the support frame (1). The two U-shaped clamps (25) are symmetrically arranged inside the support frame (1), and the reinforcing bars are located inside the two U-shaped clamps (25).

3. The high efficiency rebar cutting apparatus of claim 1, wherein: The right end of the U-shaped clamping seat (25) is fixedly installed with the left end of the air intake drive pipe (24). The inner wall of the drive groove (26) is fixedly connected with the inner wall of the air intake drive pipe (24). The four sides of the air pressure piston (28) are sealed and slid with the inner wall of the drive groove (26) through the sealing ring. One end of the spring (29) is fixedly installed with the inner wall of the drive groove (26). The left end of the clamping rod (27) is inclined.

4. The high efficiency rebar cutoff apparatus of claim 1, wherein: The auxiliary cutter (211) is set in a corresponding manner to the main cutter (31) to realize the cutting operation. The top of the two air intake drive pipes (24) are fixedly installed with exhaust pipes (212), and exhaust valves (213) are fixedly installed on the surface of the exhaust pipes (212).

5. The high efficiency rebar cutoff apparatus of claim 1, wherein: The drive cutting mechanism (3) includes a motor base (32). The bottom of the motor base (32) is fixedly installed on the bottom surface of the left end of the support frame (1). The support frame (1) is also fixedly installed with bearing seats (33) and tensioning columns (34). The six bearing seats (33) are arranged in three groups. The opposite surfaces of the bearing seats (33) in the first group are rotatably connected to pulley shafts (35) through bearings. The top of the motor base (32) is fixedly installed with a drive motor (36). The output end of the drive motor (36) is installed with a drive pulley (37) through a coupling. One end of the pulley shaft (35) is fixedly installed with a driven pulley (38). The groove of the drive pulley (37) and the groove of the driven pulley (38) are both connected by belts (39). The tensioning column (34) is slidably mounted with a connecting seat (310), and the surface of the connecting seat (310) is rotatably connected to a rotating shaft (311) via a bearing. One end of the rotating shaft (311) is fixedly mounted with a tensioning wheel (312), and the surface of the tensioning wheel (312) is connected to the belt (39) for transmission.

6. The high efficiency rebar cutoff apparatus of claim 5, wherein: The opposing surfaces of the bearing housings (33) in the second group are rotatably connected to a linkage gear shaft (313) via bearings. A linkage gear (314) is fixedly installed on the arc surface of the linkage gear shaft (313). The teeth of the linkage gear (314) mesh with the tooth grooves on the surface of the rotating shaft (311). The opposing surfaces of the bearing housings (33) in the third group are rotatably connected to an eccentric shaft (315) via bearings. A driven gear (316) is fixedly installed on the arc surface of the eccentric shaft (315). The teeth of the driven gear (316) mesh with the tooth grooves on the linkage gear shaft (313).

7. The high efficiency rebar cutoff apparatus of claim 6, wherein: The eccentric shaft (315) has a push rod (317) rotatably connected to the arc surface via a bearing. One end of the push rod (317) is rotatably connected to a sliding rod (318) via a pin. A fixed sleeve (319) is slidably inserted into the surface of the sliding rod (318). The bottom of the fixed sleeve (319) is fixedly installed on the frame surface of the support frame (1). One end of the sliding rod (318) is fixedly installed on the mounting surface of the main cutter (31).

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