A high-precision gate shearing machine and a method for fine-tuning the gap between blades

Abstract

The present invention discloses a high-precision gate shearing machine and a method for fine-tuning the blade gap, which belongs to the forging machine tool technology. It includes a tool holder body, wherein a group of limiting structures are arranged on both sides of the top of the tool holder body, a rear fulcrum is arranged on the rear side of the tool holder body, and a front fulcrum is arranged on the front side. The two groups of limiting structures are slidably matched with sliding components inside, and the two groups of sliding components are respectively installed on the corresponding oil cylinders. The new upper tool holder stable structure basically adopts a three-point support structure, but the rolling rear upper fulcrum is changed to a sliding sliding component. The degree of freedom of the traditional rolling rear upper fulcrum in the front and rear directions is not completely restricted. This traditional structure cannot offset the error caused by the torsional stress at both ends under the action of torque, and will also affect the already adjusted blade gap, resulting in changes in the blade gap, affecting the shearing accuracy and cross-section quality. By changing the distribution position of the frame guide rail, the influence of the torsion angle caused by the torque difference on the left and right sides on the tool holder stiffness is offset during shearing.

Description

Technical Field

[0001] The present invention belongs to the technical field of forging machines, and more specifically, relates to a gate shearing machine capable of achieving high precision and high shearing quality. The gate shearing machine adopts a new upper tool holder stabilizing structure, that is, the distribution position of the frame guide rails is changed to offset the influence of the torsion angle caused by the torque difference between the left and right sides on the tool holder stiffness during shearing. Background Art

[0002] At present, the common gate shearing machine tool frame structure is as follows Figures 1 to 3 As shown: the three-point support structure, the most severe working conditions of the tool holder are the shearing starting point and the middle section of the tool holder. The shearing starting point produces the maximum unit pressure on a guide rail on the tool holder, and the maximum bending moment is generated on the middle section of the tool holder, thereby generating the maximum stress, deflection and torque (the maximum horizontal deflection of the middle section of the tool holder directly affects the rigidity of the tool holder structure. The maximum horizontal deflection of the middle section of the tool holder is equal to the deflection caused by the horizontal thrust of the shear force + the deflection value corresponding to the torsion angle caused by the torque difference between the left and right ends of the tool holder). This structure cannot offset the error caused by the torsional stress at both ends under the action of torque, and will also affect the already adjusted blade gap, causing the blade gap to change, greatly affecting the shearing accuracy and section quality.

[0003] Another example is a hydraulic gate shearing machine with publication number CN103286370A, which includes a knife adjustment mechanism, a left oil cylinder, a frame, a right oil cylinder, a rear upper support, a front support, a rear lower support, a safety fence, a knife holder, a sprocket, a bracket and a rear stopper. The left oil cylinder and the right oil cylinder are fixedly connected at both ends of the top of the frame, the knife adjustment mechanism is fixedly installed on one side, and the rear upper support and the rear lower support are installed from the other side. The front of the frame is provided with a front support and a safety fence, the knife holder is integrally sleeved on the sprocket, and a rear stopper is provided below the bracket. This type of gate shearing machine also has the above-mentioned problems.

[0004] Another example is Chinese patent CN203390281U, which discloses a high-efficiency hydraulic gate shearing machine, including a peripheral frame, an upper tool holder, a lower tool holder, a material pressing system, a main hydraulic cylinder, a hydraulic part, a tool system, an electrical control system, a shearing guide and gap adjustment part, and a rear stopper part. A reinforcing plate is arranged on the side of the peripheral frame, and crisscross ribs are arranged on the back of the upper tool holder and the front of the lower tool holder. A safety component is arranged on the front frame of the pressure column of the material pressing system, and a shearing material collecting and transporting device is arranged inside the peripheral frame. A plurality of lighting devices are arranged on the peripheral frame. In paragraph

[0023] of the specification, it is recorded that: the shearing guide and gap adjustment part includes a motor, a reducer, two groups of eccentric shafts and a clamping wheel. The tail of the clamping wheel is connected to an elastic member fixed on the peripheral frame. The two groups of eccentric shafts and the clamping wheel are connected to the upper tool holder by three-point clamping. The contact part between the upper tool holder and the two groups of eccentric shafts and the clamping wheel is provided with a wear-resistant lining. The above-mentioned problems also exist in this type of gate shearing machine.

[0005] Another example is a shearing machine with a material-leveling mechanism disclosed in publication number CN113145916A, which relates to the technical field of shearing machines, specifically a shearing machine body, a shearing machine frame and a hopper assembly, wherein a shearing machine table is fixed on the upper end of the shearing machine body, and a feeding movable plate is movably connected to the upper surface of the shearing machine body, the shearing machine frame is welded to the upper side of the rear end of the shearing machine body, and a limiting block plate is fixed on the surface of the shearing machine frame, a control board is fixed on the left and right ends of the shearing machine frame, and a shearing machine control cabinet is fixed on the right side of the shearing machine frame. The shearing machine with a material-leveling mechanism is provided with a limiting block plate, and a plurality of limiting block plates are fixed on the surface of the shearing machine frame, which are consistent with the opening size of the rear end of the shearing tool holder, and when the shearing tool holder is driven by the internal device of the control board and then slides up and down, it can be limited left and right by the limiting block plate, and auxiliary lifting and lowering adjustment is performed on it to prevent the shearing tool holder from offsetting and loosening during movement, thereby improving the stability of the equipment operation. Although left and right limiters are used, this technology can only prevent the tool holder from deviating left and right, but it cannot overcome the above-mentioned problems caused by the existence of torque. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies in the prior art, namely, how to solve the influence of the torsion angle caused by the torque difference of the tool holder on the stiffness by changing the tool holder or guide rail structure while ensuring that the cost remains unchanged as much as possible. Therefore, a gate shearing machine capable of achieving high precision and high shearing quality is proposed. The design points are mainly concentrated on the stability of the upper tool holder and the precise adjustment of the blade gap.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A novel upper tool holder stabilizing structure comprises a tool holder body, wherein a group of limiting structures are arranged on both sides of the top of the tool holder body, a rear fulcrum is arranged on the rear side of the tool holder body, and a front fulcrum is arranged on the front side, and sliding components are slidably matched inside the two groups of limiting structures, and the two groups of sliding components are respectively installed on corresponding oil cylinders.

[0009] Based on the above solution, the following improvement is made: the limiting structure includes two clamping plates arranged front and back, and the front and back degrees of freedom of the sliding component are limited by the two clamping plates.

[0010] Based on the above solution, the following improvement is made: the sliding component can deflect to a corresponding angle within a certain angle range relative to the corresponding oil cylinder.

[0011] Based on the above scheme, the following improvements are made. The sliding assembly includes a rotating block slidably arranged on the inner side of the limiting structure, a rotating shaft rotatably arranged with the rotating block, a mounting plate for mounting the rotating shaft, and a cover plate for limiting the rotating block on the rotating shaft. The mounting plate is installed on the side of the cylinder by bolts.

[0012] The following improvements are made on the basis of the above scheme, which also includes a return cylinder, the piston rod of the cylinder abuts against the side top of the tool holder body through a connecting component, the return cylinder is arranged on the rear side of the tool holder body and the top of the piston rod of the return cylinder abuts against the tool holder body.

[0013] Based on the above scheme, the following improvements are made. The connecting assembly includes a semicircular block installed on the end of the cylinder piston rod and a fixed plate installed on the tool holder body. The semicircular block can deflect relative to the piston rod within a certain angle range. The semicircular block is connected and fixed to the fixed plate by a clamping plate and an intermediate pad.

[0014] On the basis of the above scheme, the following improvements are made: the front fulcrum is an infinitely adjustable structure, the front fulcrum includes a mounting seat, a mounting cavity is arranged inside the mounting seat, a guide shaft is installed inside the mounting cavity, and a disc spring is arranged between the guide shaft and the bottom cavity of the mounting cavity, the end of the guide shaft extends to the outside of the mounting cavity and a roller is installed through a pin shaft, a fine-thread top shaft is installed on the mounting seat, the fine-thread top shaft passes through the disc spring and is partially socketed on the inner side of the guide shaft.

[0015] Based on the above scheme, the following improvements are made: a locating pin is arranged on the mounting seat, a locking nut is threadedly installed on the outer side of the fine-thread top shaft, a locating pin is arranged on the mounting seat, a nylon plate is installed at one end of the pin shaft, and at least one guide belt is installed between the outer wall of the guide shaft and the side wall of the mounting cavity.

[0016] A high-quality shearing method for a high-precision gate shearing machine, the high-quality shearing steps are: the cylinder piston rod drives the tool holder body to move downward through the connecting assembly, the piston rod of the return cylinder is recovered, and at the same time the rotating block moves downward along the front and rear clamping plates, and the front and rear guide rails of the tool holder body move downward under the action of the front fulcrum and the rear fulcrum. When the shearing action occurs, the torque generated by the tool holder body is inserted on the front and rear clamping plates and is completely offset, directly eliminating the deflection change of the machine tool caused by the torsion angle. After the tool holder body moves downward to the final position, the piston rod of the return cylinder is extended outward to reset to the initial height and the piston rod of the cylinder is recovered.

[0017] A method for fine-tuning the blade gap of a high-precision gate-type shearing machine, the steps of fine-tuning the blade gap are as follows: by rotating and adjusting the center position of the roller of the rear fulcrum, the center position of the roller of the front fulcrum is adjusted, and a wrench tool is used to rotate the fine-thread top shaft to drive the disc spring to compress and push the guide shaft to move. At the same time, the nylon plate is attached to the inner side mounting surface of the wall panel and moves synchronously with the guide shaft. The roller is tightly attached to the front guide plate of the tool holder. The compression amount of the disc spring is controlled by the fine-thread top shaft. After adjustment, the locking nut is rotated to prevent the thread from loosening. During the movement of the guide shaft, the rotating shaft rotates a corresponding angle relative to the rotating block to complete the adjustment of the inclination angle of the tool holder and the blade gap.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The new upper blade stabilizing structure of the gate shearing machine described in the present invention also basically adopts a three-point support structure, but the rolling rear upper fulcrum is changed into a sliding sliding assembly. The freedom of the traditional rolling rear upper fulcrum in the front and rear directions is not completely restricted. This traditional structure cannot offset the error caused by the torsional stress at both ends under the action of torque, and will also affect the already adjusted blade gap, resulting in changes in the blade gap, which greatly affects the shearing accuracy and section quality.

[0020] The sliding assembly of the present invention not only acts as a guide rail, but also the front and rear two clamping plates of the structure clamp the rotating block of the sliding assembly front and back, completely limiting the freedom of the tool holder in the front and rear directions. When the shearing action occurs, the torque difference generated by the tool holder is completely offset on the front and rear clamping plates, which directly eliminates the deflection change caused by the torsion angle. In this way, when designing the tool holder structure, only the deflection deformation caused by the horizontal thrust needs to be considered, which directly greatly reduces the material used for the tool holder and reduces the cost. This situation is very obvious on the gate shearing machine with a length of more than 6 meters (the longer the tool holder, the greater the deflection deformation caused by the torsion angle). Since the sliding assembly is composed of a rotating block and a shaft, it is fixedly installed on one side of the left and right cylinders, can withstand pressure front and back, and can slide in the up and down directions. When the gate shearing machine performs shearing angle and blade gap operations, the rotating block can rotate with the tool holder and always fit tightly with the front and rear clamping plates of the tool holder.

[0021] The present invention also redesigns the front fulcrum structure, completely abandoning the conventional design concept. The entire front fulcrum is installed on the inner mounting surface of the machine wall panel, fixed by screws, positioned by positioning pins, and the roller is connected by a pin shaft and a guide shaft. When adjusting the elastic force of the disc spring, a wrench tool is used to rotate the fine-thread top shaft to drive the disc spring to compress and push the guide shaft to move, thereby achieving a close fit between the roller and the front guide rail plate of the tool holder. After adjustment, the locking nut is rotated to prevent the thread from loosening, and the nylon plate is fitted on the inner mounting surface of the wall panel to prevent the guide shaft from rotating during work, thereby ensuring that the roller rolls in the vertical direction. Due to the fine-thread top shaft adjustment, the complicated and rough adjustment method of the conventional front fulcrum is completely avoided, and the fine thread can achieve fine adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the front view of the stabilizing structure of the tool holder on a traditional shearing machine;

[0023] Figure 2 It is a side view of the stabilizing structure of the tool holder on a conventional shearing machine;

[0024] Figure 3 This is the working condition diagram of the stable structure of the tool holder on the traditional shearing machine;

[0025] Figure 4 It is a front view of the upper tool holder stabilizing structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the overall structure of the upper tool holder stabilizing structure of the present invention;

[0027] Figure 6 It is a rear angle schematic diagram of the upper tool holder stabilizing structure of the present invention;

[0028] Figure 7 A side view of the upper tool holder stabilizing structure of the present invention;

[0029] Figure 8 A diagram showing the connection relationship between the oil cylinder and the connection assembly of the present invention;

[0030] Fig. 9 is a cross-sectional view of the sliding assembly of the present invention;

[0031] Fig.10 It is a cross-sectional view of the connection relationship between the oil cylinder and the connection assembly of the present invention;

[0032] Fig.11 is a cross-sectional view of the front fulcrum of the present invention;

[0033] Fig.12 It is a schematic diagram of the internal structure of the front fulcrum of the present invention.

[0034] In the figure: 10, tool holder body; 11, semicircular block; 12, fixed plate; 13, clamping plate; 14, middle pad; 20, limiting structure; 21, splint; 30, rear fulcrum; 40, front fulcrum; 41, mounting seat; 42, guide shaft; 43, disc spring; 44, fine-thread top shaft; 45, roller; 46, locking nut; 47, pin shaft; 48, locating pin; 49, nylon plate; 410, guide belt; 50, sliding assembly; 51, rotating block; 52, rotating shaft; 53, cover plate; 54, mounting plate; 60, cylinder; 70, return cylinder. Implementation

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Example 1: Figures 4 to 7 As shown, a novel upper tool holder stabilizing structure includes a tool holder body 10, and a group of limiting structures 20 are arranged on the left and right sides of the top of the tool holder body 10. The limiting structure 20 includes two clamping plates 21 arranged front and back, and the two clamping plates 21 limit the front and rear freedom of the sliding component 50.

[0038] A rear fulcrum 30 is arranged on the rear side of the tool holder body 10 , and a front fulcrum 40 is arranged on the front side. Sliding assemblies 50 are slidably matched inside the two sets of limiting structures 20 , and the two sets of sliding assemblies 50 are respectively installed on corresponding oil cylinders 60 .

[0039] like Figure 8 and Fig. 9 As shown, the sliding assembly 50 can deflect at a corresponding angle relative to the corresponding cylinder 60 within a certain angle range. The sliding assembly 50 includes a rotating block 51 slidably arranged on the inner side of the limiting structure 20, a rotating shaft 52 rotatably arranged with the rotating block 51, a mounting plate 54 for mounting the rotating shaft 52, and a cover plate 53 for limiting the rotating block 51 on the rotating shaft 52. The mounting plate 54 is installed on the side of the cylinder 60 by bolts.

[0040] The new upper tool holder stabilization structure also basically adopts a three-point support structure, but the rolling rear upper fulcrum is changed to a sliding sliding component. The traditional rolling rear upper fulcrum has no complete restriction on the degree of freedom in the front and rear directions. This traditional structure cannot offset the error caused by the torsional stress at both ends under the action of torque, and will also affect the already adjusted blade gap, causing the blade gap to change, greatly affecting the shearing accuracy and section quality.

[0041] The sliding assembly of the present invention not only acts as a guide rail, but also the front and rear two clamping plates of the structure clamp the rotating block of the sliding assembly front and back, completely limiting the freedom of the tool holder in the front and rear directions. When the shearing action occurs, the torque difference generated by the left and right sides of the tool holder is completely offset on the front and rear clamping plates, which directly eliminates the deflection change caused by the torsion angle. In this way, when designing the tool holder structure, only the deflection deformation caused by the horizontal thrust needs to be considered, which directly greatly reduces the material used for the tool holder and reduces the cost. This situation is very obvious on the gate shearing machine with a length of more than 6 meters (the longer the tool holder, the greater the deflection deformation caused by the torsion angle). Since the sliding assembly is composed of a rotating block and a shaft, it is fixedly installed on one side of the left and right cylinders, can withstand pressure front and back, and can slide in the up and down directions. When the gate shearing machine performs shearing angle and blade gap operations, the rotating block can rotate with the tool holder and always fits tightly with the front and rear clamping plates of the tool holder.

[0042] Example 2: Figures 4 to 10 As shown, a high-precision gate shearing machine includes the new upper tool holder stabilizing structure as described, and also includes a return cylinder 70 with its bottom installed on the frame. The piston rod of the oil cylinder 60 abuts against the side top of the tool holder body 10 through a connecting assembly. The return cylinder 70 is arranged on the rear side of the tool holder body 10 and the top of the piston rod of the return cylinder 70 abuts against the tool holder body 10.

[0043] The connecting assembly includes a semicircular block 11 mounted on the end of the piston rod of the oil cylinder 60 and a fixed plate 12 mounted on the tool holder body 10. The semicircular block 11 can deflect relative to the piston rod within a certain angle range, and the semicircular block 11 is connected and fixed to the fixed plate 12 through a clamping plate 13 and an intermediate pad 14. When adjusting the blade gap and the inclination angle of the tool holder, the semicircular block 11 and the end of the piston rod will adaptively rotate a certain distance, but will not affect the tool holder's downward pressure to shear the plate. The double cylinder setting of the oil cylinder 60 and the return cylinder 70 is adopted. The two cylinders can avoid the return shock, vibration, and noise caused by using only the oil cylinder, and achieve stable pressure relief and flexible return. At the same time, it can also avoid the occurrence of phenomena such as oil leakage and non-return of the piston when using only the oil cylinder, and the safety will be higher.

[0044] Embodiment 3: Based on the above embodiment, the following improvements are made: Fig.11 and Fig.12As shown, the front fulcrum 40 is an infinitely adjustable structure, and the front fulcrum 40 includes a mounting seat 41, a mounting cavity is arranged inside the mounting seat 41, a guide shaft 42 is installed inside the mounting cavity, and a disc spring 43 is arranged between the guide shaft 42 and the bottom cavity of the mounting cavity, the end of the guide shaft 42 extends to the outside of the mounting cavity and a roller 45 is installed through a pin shaft 47, a fine-thread top shaft 44 is installed on the mounting seat 41, and the fine-thread top shaft 44 passes through the disc spring 43 and is partially socketed on the inner side of the guide shaft 42.

[0045] The front pivot structure has been redesigned, completely abandoning the conventional design concept. The entire front pivot is installed on the inner mounting surface of the machine wall panel and fixed with screws. The roller is connected by a pin and a guide shaft. When adjusting the disc spring elastic force, use a wrench tool to rotate the fine-thread top shaft to drive the disc spring to compress and push the guide shaft to move, so that the roller and the front guide plate of the tool holder can fit closely. Because it is adjusted by the fine-thread top shaft, the complicated and rough adjustment method of the conventional front pivot is completely avoided, and the fine thread can achieve fine adjustment.

[0046] Embodiment 4: Based on the above embodiment, the following improvements are made: a locking nut 46 is threadedly mounted on the outer side of the fine-thread top shaft 44 located outside the mounting seat 41. After adjustment, the locking nut is rotated to prevent the thread from loosening.

[0047] Embodiment 5: Based on the above embodiment, the following improvements are made: a positioning pin 48 is arranged on the mounting seat 41, a nylon plate 49 is installed at one end of the pin shaft 47, and two guide belts 410 are installed between the outer wall of the guide shaft 42 and the side wall of the mounting cavity. The nylon plate is attached to the mounting surface on the inner side of the wall panel to prevent the guide shaft from rotating during operation and ensure that the roller rolls in the vertical direction. The positioning pin is used to position the front fulcrum when installing.

[0048] Embodiment 6: A method for fine-tuning the blade gap of a high-precision gate-type shearing machine, the steps for fine-tuning the blade gap are as follows: by rotating and adjusting the center position of the roller 45 of the rear fulcrum 30, and adjusting the center position of the roller 45 of the front fulcrum 40, a wrench tool is used to rotate the fine-thread top shaft 44 to compress the disc spring 43 and push the guide shaft 42 to move. At the same time, the nylon plate 49 is attached to the inner mounting surface of the wall panel and moves synchronously with the guide shaft 42. The roller 45 is tightly attached to the front guide plate of the tool holder. The compression amount of the disc spring 43 is controlled by the fine-thread top shaft 44. After adjustment, the locking nut is rotated to prevent the thread from loosening. During the movement of the guide shaft 42, the rotating shaft 52 rotates a corresponding angle relative to the rotating block 51 to complete the adjustment of the inclination angle of the tool holder and the blade gap.

[0049] Embodiment 7: A high-quality shearing method for a high-precision gate shearing machine, wherein the high-quality shearing steps are: the piston rod of the oil cylinder 60 drives the tool holder body 10 to move downward through the connecting assembly, the piston rod of the return cylinder 70 is recovered, and at the same time the rotating block 51 moves downward along the front and rear clamping plates 21, and the front and rear guide rails of the tool holder body 10 move downward under the action of the front fulcrum 40 and the rear fulcrum 30. When the shearing action occurs, the torque generated by the tool holder body 10 is inserted on the front and rear clamping plates 21 and is completely offset, directly eliminating the deflection change of the machine tool caused by the torsion angle. After the tool holder body 10 moves downward to the final position, the piston rod of the return cylinder 70 is extended outward to reset to the initial height and at the same time the piston rod of the oil cylinder 60 is recovered.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. The top of the linear motor at the rear fulcrum is hingedly mounted on the frame, and an eccentric shaft is installed on the output end through a swing arm and rollers are arranged on it, and the eccentric shaft is installed with a mounting plate fixed to the frame. The replacement can be a replacement of part of the structure, device, method steps, or a complete technical solution. Equivalent replacement or change according to the technical solution of the present invention and its inventive concept should be covered within the protection scope of the present invention.

Claims

1. A high-precision gate shearing machine, comprising a novel upper tool holder stabilizing structure, the novel upper tool holder stabilizing structure comprising a tool holder body (10), characterized in that: A set of limiting structures (20) are arranged on both left and right sides of the top of the tool holder body (10); a rear fulcrum (30) is arranged on the rear side of the tool holder body (10), and a front fulcrum (40) is arranged on the front side; sliding components (50) are slidably matched inside the two sets of limiting structures (20); and the two sets of sliding components (50) are respectively mounted on corresponding oil cylinders (60); The limiting structure (20) comprises two clamping plates (21) arranged front and back, and the two clamping plates (21) are used to limit the front and back degrees of freedom of the sliding component (50); The sliding assembly (50) can deflect at a corresponding angle relative to the corresponding oil cylinder (60) within a certain angle range; The sliding assembly (50) comprises a rotating block (51) slidably arranged inside the limiting structure (20), a rotating shaft (52) rotatably arranged with the rotating block (51), a mounting plate (54) for mounting the rotating shaft (52), and a cover plate (53) for limiting the rotating block (51) on the rotating shaft (52); the mounting plate (54) is mounted on the side of the oil cylinder (60) by means of bolts; The shearing machine further comprises a return cylinder (70), the piston rod of the oil cylinder (60) abuts against the side top of the tool holder body (10) through a connecting assembly, the return cylinder (70) is arranged on the rear side of the tool holder body (10) and the top of the piston rod of the return cylinder (70) abuts against the tool holder body (10).

2. A high-precision gate shearing machine according to claim 1, characterized in that: The connecting assembly comprises a semicircular block (11) mounted on the end of the piston rod of the oil cylinder (60) and a fixing plate (12) mounted on the tool holder body (10); the semicircular block (11) can deflect relative to the piston rod within a certain angle range; the semicircular block (11) is connected and fixed to the fixing plate (12) via a clamping plate (13) and an intermediate pad (14).

3. A high-precision gate shearing machine according to claim 1, characterized in that: The front fulcrum (40) is a stepless adjustment structure. The front fulcrum (40) comprises a mounting seat (41). A mounting cavity is arranged inside the mounting seat (41). A guide shaft (42) is installed inside the mounting cavity. A disc spring (43) is arranged between the guide shaft (42) and the bottom cavity of the mounting cavity. The end of the guide shaft (42) extends to the outside of the mounting cavity and is provided with a roller (45) via a pin shaft (47). A fine-thread top shaft (44) is installed on the mounting seat (41). The fine-thread top shaft (44) passes through the disc spring (43) and is partially socketed on the inside of the guide shaft (42).

4. A high-precision gate shearing machine according to claim 3, characterized in that: A locking nut (46) is threadedly mounted on the outer side of the fine-thread top shaft (44) located outside the mounting seat (41), a positioning pin (48) is arranged on the mounting seat (41), a nylon plate (49) is mounted on one end of the pin shaft (47), and at least one guide belt (410) is installed between the outer wall of the guide shaft (42) and the side wall of the mounting cavity.

5. A high-quality shearing method for a high-precision gate shearing machine according to claim 4, characterized in that: High-quality cutting steps: The piston rod of the oil cylinder (60) drives the tool holder body (10) to move downward through the connecting assembly, and the piston rod of the return cylinder (70) is retracted. At the same time, the rotating block (51) moves downward along the front and rear clamping plates (21), and the front and rear guide rails of the tool holder body (10) move downward under the action of the front fulcrum (40) and the rear fulcrum (30). When the shearing action occurs, the torque difference generated by the tool holder body (10) is completely offset on the front and rear clamping plates (21), directly eliminating the deflection change of the machine tool caused by the torsion angle. After the tool holder body (10) moves downward to the final position, the piston rod of the return cylinder (70) is extended outward to reset to the initial height, and the piston rod of the oil cylinder (60) is retracted.

6. A method for fine-tuning the blade gap of a high-precision gate shearing machine as claimed in claim 4, characterized in that: Steps for fine adjustment of blade clearance: The center position of the roller (45) of the rear fulcrum (30) is adjusted by rotation, and then the center position of the roller (45) of the front fulcrum (40) is adjusted. The fine thread top shaft (44) is rotated with a wrench tool to drive the disc spring (43) to compress and push the guide shaft (42) to move. At the same time, the nylon plate (49) is attached to the inner side mounting surface of the wall panel and moves synchronously with the guide shaft (42). The roller (45) is tightly attached to the front guide plate of the tool holder. The compression amount of the disc spring (43) is controlled by the fine thread top shaft (44). After adjustment, the locking nut is rotated to prevent the thread from loosening. During the movement of the guide shaft (42), the rotating shaft (52) rotates a corresponding angle relative to the rotating block (51), thereby completing the adjustment of the inclination angle of the tool holder and the blade clearance.

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