Steel plate shearing machine

Abstract

The steel plate shearing machine comprises a rack, a workbench is arranged on the rack, a punching mechanism is arranged on the rack, the punching mechanism comprises an oil cylinder fixedly connected to the rack, a piston rod of the oil cylinder is connected with a fixing frame, a containing groove is formed in the fixing frame, a tool rest is arranged in the containing groove, and a tool bit is connected to the bottom of the tool rest; guide plates are fixedly connected to the two symmetrical sides of the inner wall of the rack and provided with vertically-arranged guide grooves and sliding grooves, the sliding grooves are formed in the guide plates and obliquely arranged upwards from the bottoms of the guide grooves, reset grooves are formed in the positions, located at the tops of the sliding grooves, of the guide plates, and the two ends of the reset grooves communicate with the tops of the sliding grooves and the tops of the guide grooves correspondingly. The sliding groove, the reset groove and the guide groove are sequentially connected end to end. Limiting columns are fixedly connected to the two sides of the tool rest and slidably connected into the guide grooves, the sliding grooves and the reset grooves. The tool bit has the advantages that friction between the tool bit and a steel plate is reduced, the service life of the tool bit is prolonged, and the quality of the steel plate is not affected.

Description

Technical Field

[0001] The present application relates to the field of steel plate shearing equipment, and in particular to a steel plate shearing machine. Background Art

[0002] Shearing machine, as an important equipment for plate cutting, has been widely used in many industries such as automobile manufacturing, construction, and iron tower. Common types of shearing machines are mainly hydraulic and parallel shearing. Among them, hydraulic shearing machine relies on high-pressure oil to drive the piston to generate huge punching force to complete the cutting action, which has the characteristics of high efficiency and strong load-bearing capacity.

[0003] However, the hydraulic cylinder pushes the tool holder to move vertically, thereby driving the blade to move vertically to cut the steel plate. After shearing, the sides of the tool holder and the blade are retracted on the piston rod, and the shearing surface contacts and slides with the sides of the blade and the side of the tool holder. The steel plate rubs against the side of the blade, causing varying degrees of damage to the shearing surfaces of the tool holder and the blade. The blade causes wear on the cutting surface of the steel plate, which not only affects the service life of the blade and the tool holder, but also affects the quality of the sheared steel plate. Therefore, it is an urgent problem to be solved to set up a shearing machine in which the blade is reset away from the steel plate after cutting the steel plate. Summary of the invention

[0004] In order to allow the cutter head to be retracted and reset away from the steel plate after shearing the steel plate, thereby reducing the friction between the cutter head and the steel plate, extending the service life of the cutter head, and not affecting the quality of the steel plate, the present application provides a steel plate shearing machine.

[0005] The present application provides a steel plate shearing machine which adopts the following technical solution:.

[0006] A steel plate shearing machine comprises a frame, a workbench is arranged on the frame, a punching mechanism is arranged on the frame, the punching mechanism comprises an oil cylinder fixedly connected to the frame, the oil cylinder is arranged vertically, the piston rod of the oil cylinder extends downward into the frame and is fixedly connected to a fixed frame, a receiving groove is arranged in the fixed frame, a tool holder is arranged in the receiving groove, a tool head is detachably connected to the bottom of the tool holder, and hinged telescopic components are arranged at both ends of the tool holder and the fixed frame, and the hinged telescopic components are used to make the tool holder rotate and telescope around the fixed frame; guide plates are fixedly connected to the symmetrical two sides of the inner wall of the frame, and vertical A guide groove is set upward, and a sliding groove is provided on the guide plate. The sliding groove is set upward from the bottom of the guide groove. A reset groove is provided on the guide plate at the top of the sliding groove. The two ends of the reset groove are respectively connected with the top of the sliding groove and the guide groove. The sliding groove, the reset groove and the guide groove are connected end to end in sequence; the tool holder is fixedly connected to the limiting columns on both sides perpendicular to the feeding direction of the workbench, and the limiting columns are slidably connected to the guide groove, the sliding groove and the reset groove. A connecting rod assembly is provided on the fixed frame. When the piston rod of the cylinder is retracted, the fixed frame drives the tool holder to rotate around the hinged telescopic assembly through the connecting rod assembly.

[0007] By adopting the above technical solution, when the user uses it, the piston rod of the oil cylinder extends, pushing the fixed frame and the tool holder downward, pushing the cutter head downward to punch and shear the steel plate on the workbench, and after the shearing is completed, the piston rod of the oil cylinder is retracted, and the connecting rod assembly on the fixed frame drives the tool holder to rotate around the hinged telescopic assembly, so that the limit column slides into the sliding groove, driving the tool holder to slide upward, thereby separating the tool holder from the steel plate, and the cutter head is retracted and reset away from the steel plate, thereby reducing the friction between the cutter head and the steel plate, extending the service life of the cutter head, and not affecting the quality of the steel plate.

[0008] Optionally, the connecting rod assembly includes a connecting rod 1 hinged to the side wall of the fixing frame, an end of the connecting rod 1 away from the fixing frame is hinged to a connecting rod 2, and an end of the connecting rod 2 away from the connecting rod 1 is hinged to the tool holder.

[0009] By adopting the above technical solution, when the user uses it, after the cutter head completes shearing, the piston rod of the oil cylinder is retracted, driving the fixed frame to slide upward, and the fixed frame pulls the tool holder to tilt toward the side of connecting rod one through connecting rod one and connecting rod two, so that the limit column on the tool holder slides into the sliding groove, thereby pulling the tool holder to tilt upward and retract, so that the cutter head is away from the steel plate during the upward retraction process, reducing the friction between the steel plate and the cutter head.

[0010] Optionally, the articulated telescopic assembly includes a positioning sleeve hinged to both ends of the tool holder, a positioning column hinged on the fixed frame, the end of the positioning column is fixedly connected to a return spring, and the end of the return spring is fixedly connected to the inner bottom wall of the positioning sleeve.

[0011] By adopting the above technical solution, when the user uses it, after the cutter head completes the shearing, the piston rod of the oil cylinder is retracted, driving the fixed frame to slide upward, and connecting rod one and connecting rod two pull the tool holder to tilt to the side of connecting rod one. At this time, the elastic force of the return spring pushes the tool holder to move, and through the cooperation of connecting rod one, connecting rod two and the return spring, the limit column on the tool holder slides into the sliding groove.

[0012] Optionally, a guiding inclined surface is provided on a side of the inner wall of the accommodating groove close to the first connecting rod, and a sliding inclined surface cooperating with the guiding inclined surface is provided on the tool holder.

[0013] By adopting the above technical solution, when the user uses it, after the limit post on the tool holder slides upward along the sliding groove to the end, the reset spring is stretched to the maximum, and the tension of the reset spring pulls the tool holder to continue to slide upward, so that the sliding inclined surface of the tool holder slides upward along the guide inclined surface, which is convenient for resetting the tool holder, thereby causing the limit post on the tool holder to slide from the sliding groove into the reset groove, and finally slide to the top of the guide groove to reset.

[0014] Optionally, a locking block is fixedly connected to the cutter head, and a card slot and a locking slot are provided on the tool holder. The card slot is used for the cutter head to be plugged in, and the locking slot is used for the locking block to be plugged in. The tool holder is provided with multiple through holes, and the cutter head and the locking block are provided with through holes. The bolt passes through the through hole and the through hole and is threadedly connected with a nut.

[0015] By adopting the above technical solution, when the user uses it, the bolt passes through the through hole and the through hole and is threadedly connected with a nut, so that the cutter head and the locking block can be fixed on the tool holder. The bolt and nut fixation can facilitate the disassembly and installation of the cutter head.

[0016] Optionally, the tool holder is provided with a plurality of grooves in the locking slot, and a locking spring is provided at the bottom of the locking block, and the locking spring is used to be inserted into the groove.

[0017] By adopting the above technical solution, when the user uses it, the locking spring is used to be inserted into the groove, and the tension of the locking spring is more firmly abutted against the inner wall of the locking block and the locking groove, thereby fixing the cutter head more firmly.

[0018] Optionally, a clamping mechanism is provided on one side of the fixing frame close to the workbench; the clamping mechanism comprises a connecting plate connected to the fixing frame, the bottom of the connecting plate is connected to a clamping plate, and the bottom of the clamping plate is lower than the bottom of the tool holder.

[0019] By adopting the above technical solution, when the user uses it, the piston rod of the oil cylinder is extended, pushing the connecting plate and the clamping plate to slide downward, so that the clamping plate abuts against the top of the steel plate to fix the steel plate.

[0020] Optionally, a limiting groove is provided at the bottom of the connecting plate, a guide column is fixedly connected to the top of the clamping plate, the guide column is slidably connected in the limiting groove, a buffer spring is sleeved on the guide column, and both ends of the buffer spring are respectively fixedly connected to the connecting plate and the clamping plate.

[0021] By adopting the above technical solution, when the user uses it, when the oil cylinder pushes the connecting plate and the clamping plate to move downward, the clamping spring has a buffering effect on the clamping plate and can also elastically compress the steel plate. When the piston rod of the oil cylinder is retracted, the tension of the buffer spring facilitates pushing the connecting plate to reset.

[0022] Optionally, a plurality of sliding blocks are fixedly connected to one side of the clamping plate close to the tool holder, a sliding groove is provided on the tool holder, and the sliding blocks are slidably connected in the sliding groove.

[0023] By adopting the above technical solution, when the user uses it, when the clamping plate slides downward, the slider slides in the slide groove, guiding and limiting the downward movement of the clamping plate. When the tool holder rotates to one side, the slider disengages from the slide groove and does not interfere with the tilted upward sliding of the tool holder.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. A vertically arranged guide groove is provided on the guide plate, a sliding groove is provided on the guide plate, the sliding groove is inclined upward from the bottom of the guide groove, a reset groove is provided at the top of the guide plate at the sliding groove, two ends of the reset groove are respectively connected with the sliding groove and the top of the guide groove, and the sliding groove, the reset groove and the guide groove are connected end to end in sequence; the tool holder is fixedly connected to the limited position columns on both sides perpendicular to the feeding direction of the workbench, the limit column is slidably connected to the guide groove, the sliding groove and the reset groove, the fixed frame is hinged with a connecting rod 1, the end of the connecting rod 1 away from the fixed frame is hinged with a connecting rod 2, and the end of the connecting rod 2 away from the connecting rod 1 is hinged on the tool holder, the piston rod of the oil cylinder is retracted, and the fixed frame is driven to slide upward, and the fixed frame pulls the tool holder to tilt toward one side of the connecting rod 1 through the connecting rod 1 and the connecting rod 2, so that the limit column on the tool holder slides into the sliding groove, thereby pulling the tool holder to tilt upward and retract, so that the cutter head is away from the steel plate during the upward retraction, thereby reducing the friction between the steel plate and the cutter head; 2. By fixing the cutter head and the cutter holder with bolts, it is convenient to replace the cutter head regularly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a cross-sectional view of an embodiment of the present application; Figure 3 It is an exploded diagram of the punching mechanism and the clamping mechanism; Figure 4 It is a cross-sectional view of the punching mechanism and the pressing mechanism; Figure 5 It is an exploded view of the fixed frame, the tool holder and the clamping mechanism; Figure 6 It is a cross-sectional view of the fixed frame, the tool holder and the clamping mechanism.

[0026] Description of reference numerals: 1, frame; 11, workbench; 12, limit plate; 13, guide plate; 131, guide groove; 132, sliding groove; 133, reset groove; 2, punching mechanism; 21, oil cylinder; 22, fixed frame; 221, receiving groove; 2211, guide slope; 222, positioning column; 223, reset spring; 224, connecting rod 1; 225, connecting rod 2; 23, tool holder; 231, positioning sleeve ; 232, limit column; 233, limit block; 234, sliding slope; 235, slot; 236, locking slot; 237, through hole; 238, groove; 239, slide groove; 24, cutter head; 241, locking block; 242, through hole; 243, locking spring; 3, clamping mechanism; 31, connecting plate; 32, clamping plate; 33, limit slot; 34, guide column; 35, buffer spring; 36, slider. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 This application is described in further detail.

[0028] The present application embodiment discloses a steel plate shearing machine, referring to Figure 1 , including a frame 1, the frame 1 is a door-type frame, a workbench 11 is arranged on the frame 1, the workbench 11 is arranged horizontally, and a punching mechanism 2 is arranged on the frame 1 for shearing the steel plate on the workbench 11.

[0029] The punching mechanism 2 includes a cylinder 21 fixedly connected to the frame 1. The cylinder 21 is vertically arranged. The cylinder body of the cylinder 21 is fixedly connected to the top of the frame 1. The piston rod of the cylinder 21 extends downward into the frame 1 and is fixedly connected to a fixed frame 22. Two limit plates 12 are arranged on the frame 1. The limit plates 12 are bolted to the frame 1. The limit plates 12 are perpendicular to the feeding direction of the workbench 11. The limit plates 12 are located on both sides of the fixed frame 22 to limit the vertical movement of the fixed frame 22. A receiving groove 221 is provided in the fixed frame 22, and a tool holder 23 is arranged in the receiving groove 221. A cutter head 24 is connected to the bottom of the tool holder 23, and positioning sleeves 231 are hinged at both ends of the tool holder 23. A positioning column 222 is hinged on the fixed frame 22, and a return spring 223 is fixedly connected to the end of the positioning column 222, and the end of the return spring 223 is fixedly connected to the inner bottom wall of the positioning sleeve 231; when the piston rod of the oil cylinder 21 is extended, the fixed frame 22 and the tool holder 23 are pushed downward, and the fixed frame 22 compresses the return spring 223 downward, pushing the cutter head 24 downward to punch and shear the steel plate on the workbench 11.

[0030] The inner wall of the frame 1 is symmetrically fixedly connected with guide plates 13 on both sides, and a guide groove 131 is provided on the guide plate 13, and the guide groove 131 is vertically arranged. A sliding groove 132 is provided on the guide plate 13, and the sliding groove 132 is inclined. The sliding groove 132 is inclined upward from the bottom of the guide groove 131, and the sliding groove 132 is connected to the bottom of the guide groove 131. The guide plate 13 is located at the top of the sliding groove 132. The two ends of the reset groove 133 are respectively connected to the top of the sliding groove 132 and the guide groove 131. The sliding groove 132, the reset groove 133 and the guide groove 131 are connected end to end in sequence to form a triangle; the tool holder 23 is fixedly connected to the limiting columns 232 on both sides perpendicular to the feeding direction of the workbench 11, and the ends of the limiting columns 232 are fixedly connected to the limiting blocks 233. The limiting columns 232 are inserted into the guide groove 131 and can slide in the guide groove 131, the sliding groove 132 and the reset groove 133. The limiting blocks 233 are used to prevent the limiting columns 232 from being separated from the guide groove 131, the sliding groove 132 and the reset groove 133.

[0031] The first and second connecting rods 224 and 225 are respectively used to move the tool holder 23 and the second connecting rod 225, and the second connecting rod 225 is respectively used to move the tool holder 23 and the second connecting rod 224.

[0032] A guide slope 2211 is provided on the inner wall of the receiving groove 221 near the connecting rod 1 224, and a sliding slope 234 cooperating with the guide slope 2211 is provided on the tool holder 23; when the limiting column 232 on the tool holder 23 slides upward along the sliding groove 132 to the end, the return spring 223 is stretched to the maximum, and the tension of the return spring 223 pulls the tool holder 23 to continue to slide upward, so that the sliding slope 234 of the tool holder 23 slides upward along the guide slope 2211, and the tool holder The limiting column 232 on 23 slides from the sliding groove 132 to the reset groove 133, and finally slides to the top of the guide groove 131, so that when the tool holder 23 shears downward, the tool holder 23 drives the cutter head 24 to punch vertically downward, and when the tool holder 23 drives the cutter head 24 to reset upward, it slides obliquely upward along the sliding groove 132 and the reset groove 133, and then moves upward during the upward movement, so that the cutter head 24 is away from the steel plate during the upward retraction process, thereby reducing the friction between the steel plate and the cutter head 24.

[0033] A locking block 241 is fixedly connected to the cutter head 24, and a slot 235 and a locking slot 236 are provided on the tool holder 23. The slot 235 is used for the cutter head 24 to be plugged in, and the locking slot 236 is used for the locking block 241 to be plugged in. A plurality of through holes 237 are provided on the tool holder 23, and a through hole 242 is provided on the cutter head 24 and the locking block 241. Bolts pass through the through holes 242 and the through holes 237 and are threadedly connected with nuts, so that the cutter head 24 and the locking block 241 can be fixed to the tool holder 23. The bolt and nut fixation can facilitate the disassembly and installation of the cutter head 24. The tool holder 23 is provided with a plurality of grooves 238 in the locking groove 236, and a locking spring 243 is provided at the bottom of the locking block 241. The locking spring 243 is used to be inserted into the groove 238. The tension of the locking spring 243 is more firmly abutted against the inner wall of the locking block 241 and the locking groove 236, thereby fixing the tool head 24 more firmly.

[0034] A clamping mechanism 3 is provided on one side of the fixing frame 22 close to the workbench 11 , and the clamping mechanism 3 is used to fix the steel plate to prevent the steel plate from shaking during shearing. The clamping mechanism 3 includes a connecting plate 31 fixed by bolts on the fixing frame 22, and a clamping plate 32 is connected to the bottom of the connecting plate 31. The clamping plate 32 is L-shaped and is used to abut the top of the steel plate. The bottom of the clamping plate 32 is lower than the bottom of the tool holder 23; a plurality of limiting grooves 33 are provided at the bottom of the connecting plate 31, and a plurality of guide columns 34 are fixedly connected to the top of the clamping plate 32. The guide columns 34 are slidably connected in the limiting grooves 33, and the ends of the guide columns 34 are fixedly connected to the limiting disks. The diameter of the limiting disks is larger than the diameter of the guide columns 34, and the limiting disks are used to prevent the guide columns 34 from being separated from the limiting grooves 33; a buffer spring 35 is sleeved on the guide column 34, and the two ends of the buffer spring 35 are respectively fixedly connected to the connecting plate 31 and the clamping plate 32. The buffer spring 35 is used to elastically compress the steel plate, and at the same time, the compression spring plays a buffering role on the clamping plate 32. A plurality of slide blocks 36 are fixedly connected to one side of the clamping plate 32 close to the tool holder 23 . A plurality of slide grooves 239 are provided on the tool holder 23 . The slide blocks 36 are slidably connected in the slide grooves 239 .

[0035] The implementation principle of a steel plate shearing machine in the embodiment of the present application is as follows: when shearing the steel plate, the piston rod of the hydraulic cylinder extends, pushing the fixed frame 22 to move downward, and the fixed frame 22 pushes the connecting plate 31 and the pressing plate 32 to move downward, and the pressing plate 32 is pressed against the top of the steel plate to fix the steel plate. At the same time, the fixed frame 22 continues to move downward, and the fixed frame 22 squeezes the return spring 223. When the return spring 223 is squeezed to the maximum limit, the knife holder 23 is pushed to move downward, and the knife head 24 shears the steel plate, and the limit column 232 and the limit block 233 slide vertically downward in the guide groove 131; after the shearing is completed, the piston rod of the oil cylinder 21 is retracted, driving the fixed frame 22 to slide upward, and the fixed frame 22 pulls the knife holder 23 to tilt to one side of the connecting rod 1 224 through the connecting rod 1 224 and the connecting rod 225. At this time The elastic force of the return spring 223 pushes the tool holder 23 to move, and the connecting rod 1 224, the connecting rod 225 and the return spring 223 cooperate to make the limit column 232 on the tool holder 23 slide into the sliding groove 132, thereby pulling the tool holder 23 to tilt upward and retract, so that the cutter head 24 is away from the steel plate during the upward retraction process, reducing the friction between the steel plate and the cutter head 24; when the limit column 232 on the tool holder 23 slides upward to the end along the sliding groove 132, the return spring 223 is stretched to the maximum, and the tension of the return spring 223 pulls the tool holder 23 to continue to slide upward, so that the sliding inclined surface 234 of the tool holder 23 slides upward along the guide inclined surface 2211, and the limit column 232 on the tool holder 23 slides from the sliding groove 132 to the reset groove 133, and finally slides to the top of the guide groove 131, preparing for the next punching and resetting. That is, when the tool holder 23 shears downward, the tool holder 23 drives the cutter head 24 to punch vertically downward along the guide groove 131. When the tool holder 23 drives the cutter head 24 to reset upward, it slides obliquely upward along the sliding groove 132 and the reset groove 133, and then moves upward during the upward movement, so that the cutter head 24 is away from the steel plate during the upward retraction process, thereby reducing the friction between the steel plate and the cutter head 24.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel plate shearing machine, characterized in that: The invention comprises a frame (1), a workbench (11) is arranged on the frame (1), a punching mechanism (2) is arranged on the frame (1), the punching mechanism (2) comprises an oil cylinder (21) fixedly connected to the frame (1), the oil cylinder (21) is arranged vertically, a piston rod of the oil cylinder (21) extends downward into the frame (1) and is fixedly connected to a fixing frame (22), a receiving groove (221) is provided in the fixing frame (22), a tool holder (23) is arranged in the receiving groove (221), a tool head (24) is detachably connected to the bottom of the tool holder (23), and hinged telescopic components are arranged at both ends of the tool holder (23) and the fixing frame (22), and the hinged telescopic components are used to make the tool holder (23) rotate and telescope around the fixing frame (22); The frame (1) has guide plates (13) fixedly connected to the inner walls of the frame (1) on both sides symmetrically, a vertically arranged guide groove (131) is provided on the guide plate (13), a sliding groove (132) is provided on the guide plate (13), the sliding groove (132) is arranged obliquely upward from the bottom of the guide groove (131), the guide plate (13) is provided with a reset groove (133) at the top of the sliding groove (132), the two ends of the reset groove (133) are respectively connected to the top of the sliding groove (132) and the guide groove (131), and the sliding groove (132), the reset groove (133) and the guide groove (131) are connected end to end in sequence; The tool holder (23) is fixedly connected to limiting columns (232) on both sides perpendicular to the feeding direction of the workbench (11); the limiting columns (232) are slidably connected in the guide groove (131), the sliding groove (132) and the reset groove (133); a connecting rod assembly is arranged on the fixed frame (22); when the piston rod of the oil cylinder (21) is retracted, the fixed frame (22) drives the tool holder (23) to rotate around the hinged telescopic assembly through the connecting rod assembly.

2. A steel plate shearing machine according to claim 1, characterized in that: The connecting rod assembly comprises a connecting rod 1 (224) hinged to the side wall of the fixing frame (22), an end of the connecting rod 1 (224) away from the fixing frame (22) is hinged to a connecting rod 2 (225), and an end of the connecting rod 2 (225) away from the connecting rod 1 (224) is hinged to the tool holder (23).

3. A steel plate shearing machine according to claim 1, characterized in that: The hinged telescopic assembly comprises a positioning sleeve (231) hinged at both ends of the tool holder (23); a positioning column (222) is hinged on the fixed frame (22); the end of the positioning column (222) is fixedly connected to a return spring (223); the end of the return spring (223) is fixedly connected to the inner bottom wall of the positioning sleeve (231).

4. A steel plate shearing machine according to claim 2, characterized in that: A guide inclined surface (2211) is provided on the inner wall of the accommodating groove (221) at one side close to the connecting rod 1 (224), and a sliding inclined surface (234) cooperating with the guide inclined surface (2211) is provided on the tool holder (23).

5. The steel plate shearing machine according to claim 1, characterized in that: The cutter head (24) is fixedly connected with a locking block (241); the cutter holder (23) is provided with a slot (235) and a locking slot (236); the slot (235) is used for inserting the cutter head (24); the locking slot (236) is used for inserting the locking block (241); a plurality of through holes (237) are provided on the cutter head (24) and the locking block (241); a through hole (242) is provided on the cutter head (24) and the locking block (241); a bolt passes through the through hole (242) and the through hole (237) and is threadedly connected with a nut.

6. A steel plate shearing machine according to claim 5, characterized in that: The tool holder (23) is provided with a plurality of grooves (238) in the locking groove (236), and a locking spring (243) is provided at the bottom of the locking block (241), and the locking spring (243) is used for being inserted into the groove (238).

7. The steel plate shearing machine according to claim 1, characterized in that: A clamping mechanism (3) is provided on one side of the fixing frame (22) close to the workbench (11); The clamping mechanism (3) comprises a connecting plate (31) connected to a fixing frame (22); the bottom of the connecting plate (31) is connected to a clamping plate (32); and the bottom of the clamping plate (32) is lower than the bottom of the tool holder (23).

8. A steel plate shearing machine according to claim 7, characterized in that: A limiting groove (33) is provided at the bottom of the connecting plate (31), and a guide column (34) is fixedly connected to the top of the pressing plate (32). The guide column (34) is slidably connected in the limiting groove (33), and a buffer spring (35) is sleeved on the guide column (34). The two ends of the buffer spring (35) are respectively fixedly connected to the connecting plate (31) and the pressing plate (32).

9. A steel plate shearing machine according to claim 7, characterized in that: A plurality of slide blocks (36) are fixedly connected to one side of the clamping plate (32) close to the tool holder (23); a slide groove (239) is provided on the tool holder (23), and the slide blocks (36) are slidably connected in the slide groove (239).

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