Buffer device for punching machine

Abstract

The invention provides a buffer device for a punching machine, and relates to the field of punching machines. The stamping device comprises a stamping table and a lifting frame which are arranged on a base, a lifting plate is installed on the lifting frame in a sliding mode, an upper die is arranged on the lifting plate, a hydraulic cylinder is arranged on the lifting frame, an output shaft of the hydraulic cylinder is fixedly connected with the lifting plate, a lower die is arranged on the stamping table, and the lower die is fixedly connected with the lifting plate. A buffering mechanism is arranged between the lifting plate and the lifting frame. The method has the effect of reducing the replacement cost.

Description

Technical Field

[0001] The present application relates to the field of punching machines, and in particular to a buffer device for punching machines. Background Art

[0002] A stamping machine is a common metal processing equipment, which is mainly used to process metal sheets into parts of various shapes.

[0003] The working principle of the stamping machine: through the mold and pressure, the metal sheet is forced to deform under the physical action, and the metal sheet is processed into parts of the required shape; specifically, the stamping machine generates high pressure through the hydraulic system to move the punch downward and press the metal sheet onto the mold to complete the processing process.

[0004] At present, conventional stamping machines are generally not provided with a buffer structure; however, the stamping machine will generate a large impact force during use, and long-term use will cause the stamping machine to be damaged, shortening its lifespan, thereby affecting the cost. Summary of the invention

[0005] In order to improve the problems existing in the above-mentioned technology, the present application provides a buffer device for a stamping machine.

[0006] The present application provides a buffer device for a punching machine, which adopts the following technical solution: A buffer device for a stamping machine comprises: a stamping table and a lifting frame arranged on a base, a lifting plate being slidably mounted on the lifting frame, an upper die being arranged on the lifting plate, a hydraulic cylinder being arranged on the lifting frame, and an output shaft of the hydraulic cylinder being fixedly connected to the lifting plate, a lower die being arranged on the stamping table, and a buffer mechanism being arranged between the lifting plate and the lifting frame.

[0007] By adopting the above technical solution, since the impact force generated during stamping is relatively large, the buffer mechanism can buffer the impact force at this time, thereby protecting the hydraulic cylinder, upper die, lower die and stamping table to extend the service life, that is, reduce the replacement cost.

[0008] Optionally, the buffer mechanism includes: a hedging assembly and a buffer assembly, the hedging assembly includes: a fixed rod, a hedging rod and a hedging spring, the fixed rod is fixed to the lifting plate, and a hedging hole is provided on the fixed rod, the end of the hedging rod is arranged in the hedging hole, the hedging spring is fixed between the hedging rod and the bottom of the hedging hole, and the buffer assembly is arranged on the lifting frame.

[0009] By adopting the above technical solution, during the stamping process, the impact rod will collide with the buffer component; during this process, the impact rod is retracted into the impact hole to compress and deform the impact spring, thereby absorbing the impact force to achieve a buffering effect, thereby forming protection.

[0010] Optionally, the buffer assembly includes: a buffer seat, a buffer plate and a buffer spring, the buffer seat is fixed on the lifting frame, the buffer seat is provided with an upper cavity and a lower cavity for storing silicone oil, and a connecting hole is provided between the upper cavity and the lower cavity, the inner wall of the upper cavity is penetrated by a through hole for the impact rod to pass through, the buffer plate is arranged in the upper cavity, and the buffer spring is fixed between the buffer plate and the inner wall of the upper cavity.

[0011] By adopting the above technical solution, during stamping, the punch rod will penetrate the hole and collide with the buffer plate to press the buffer plate downward; during the pressing process, the buffer plate can squeeze the silicone oil in the upper cavity into the lower cavity, and in this process the impact force can be converted and absorbed, and the buffer spring is deformed due to the pressure, thereby further absorbing the impact force to achieve a buffering effect.

[0012] Optionally, the hedging assembly further includes: a compression block, wherein the compression block is fixed on the hedging rod.

[0013] By adopting the above technical solution, when the impact rod collides with the buffer component, the compression block will be compressed and deformed. During the deformation process, the impact force is absorbed, thereby achieving a buffering effect.

[0014] Optionally, the buffer mechanism also includes: a pressing component and a gradual change component, the pressing component includes: a pressing rod, a pressing rack, a pressing gear and a rotating gear, a accommodating cavity is opened on the buffer seat, the pressing rack is arranged in the accommodating cavity, the pressing gear and the rotating gear are both arranged on the gradual change component, and the pressing rack is meshed with the pressing gear and the rotating gear, one end of the pressing rod is fixed to the buffer plate, and the other end passes through the accommodating cavity and is fixedly connected to the pressing rack.

[0015] By adopting the above technical solution, when the buffer plate is pressed downward, the pressing rod drives the pressing rack to move downward to drive the pressing gear and the rotating gear to rotate, thereby driving the gradual change component to operate.

[0016] Optionally, the gradual change component includes: a screw rod, a push block, a connecting pipe and an expansion bag ring, the inner wall of the accommodating cavity is provided with a mounting groove, the push block is arranged in the mounting groove, and a pushing hole is provided on the push block, one end of the screw rod is rotatably installed in the mounting groove, and the other end is threadedly connected to the pushing hole, the pressing gear is coaxially sleeved on the screw rod, the expansion bag ring is fixed in the connecting hole, and the connecting pipe is connected between the expansion bag ring and the mounting groove.

[0017] By adopting the above technical solution, during the downward pressing process of the buffer plate, the pressing gear drives the screw to rotate, so that the push block approaches the expansion bag ring, that is, the silicone oil is pressed into the expansion bag ring, so that the volume of the expansion bag ring gradually increases, so as to reduce the space for oil to pass through the connecting hole, thereby more effectively absorbing the impact force and better achieving the buffering effect.

[0018] Optionally, the gradual change component also includes: a screw rod, a movable plate and a fixed plate, an accommodating groove is opened between the accommodating cavity and the connecting hole, one end of the movable plate is arranged in the accommodating groove, and the other end is arranged in the connecting hole, and a movable hole and an oil flow hole are opened on the movable plate, one end of the screw rod is rotatably installed in the accommodating groove, and the other end is threadedly connected to the movable hole, the rotating gear is coaxially sleeved on the screw rod, the fixed plate is fixed in the connecting hole, and an oil flow hole is opened through the fixed plate.

[0019] By adopting the above technical solution, during the downward pressing process of the buffer plate, the rotating gear drives the screw to rotate to drive the movable plate to be recovered into the accommodating groove, so that the oil flow hole and the oil through hole will be staggered to further reduce the oil passing space of the connecting hole, thereby more effectively absorbing the impact force to better achieve the buffering effect.

[0020] Optionally, the buffer mechanism also includes: an extrusion assembly and a push assembly, the extrusion assembly includes: a positioning seat, a positioning rod, an extrusion block, an extrusion tube and a return spring, the positioning seat is fixed on the stamping table, and the positioning rod is fixed on the positioning seat, a positioning groove and a positioning hole are provided on the lower mold, the positioning seat is arranged in the positioning groove, the positioning rod is arranged in the positioning hole, a sliding cavity is provided on the positioning seat, the extrusion block is arranged in the sliding cavity, and the return spring is fixed between the extrusion block and the inner wall of the sliding cavity, the extrusion tube is connected and arranged between the sliding cavity and the lower cavity, and the push assembly is arranged between the positioning rod and the extrusion block.

[0021] By adopting the above technical solution, when the buffer plate squeezes the silicone oil, the silicone oil can enter the sliding cavity through the extrusion tube to push the extrusion block; during this process, the return spring is deformed to absorb the impact force, thereby achieving a buffering effect.

[0022] Optionally, the pushing assembly includes: a driving rack, a driving gear, a pushing rod and a threaded rod, the positioning rod is provided with a pushing hole, the pushing rod is arranged in the pushing hole, and a threaded hole is provided on the pushing rod, one end of the threaded rod is rotatably installed in the sliding cavity, and the other end is threadedly connected to the pushing hole, the driving gear is coaxially sleeved on the driving rod, the driving rack is fixed to the extrusion block, and the driving rack is meshed with the driving gear.

[0023] By adopting the above technical solution, after the upper mold moves up, the reset spring pulls the extrusion block to reset. At this time, the driving rack drives the driving gear to rotate in the opposite direction, so that the threaded rod rotates to drive the push rod to move up and lift the plate, making it easier for the operator to pick up the plate.

[0024] Optionally, the extrusion assembly further includes: a connecting rope, one end of which is fixed to the extrusion block, and the other end of which is fixed to the buffer plate.

[0025] By adopting the above technical solution, the combined effect of the buffer spring and the reset spring is utilized to ensure that the extrusion block is pulled to reset.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. Since the impact force generated during stamping is large, the buffer mechanism can buffer the impact force at this time, thereby protecting the hydraulic cylinder, upper die, lower die and stamping table to extend their service life, that is, reduce replacement costs.

[0027] 2. During the stamping process, the impact rod will collide with the buffer component; during this process, the impact rod will be retracted into the impact hole to compress the impact spring, thereby absorbing the impact force to achieve a buffering effect and thus form protection.

[0028] 3. When the impact rod collides with the buffer component, the compression block will be compressed and deformed. During the deformation process, the impact force is absorbed to achieve a buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram according to an embodiment of the present application; Figure 2 yes Figure 1 A schematic top view of Figure 3 is along Figure 2 A schematic cross-sectional view taken along the cutting line AA in FIG. Figure 4 yes Figure 3 A schematic partial enlarged view of part B; Figure 5 yes Figure 3 A schematic partial enlarged view of section C; Figure 6 yes Figure 3 A schematic partial enlarged view of section D in the middle; Figure 7 yes Figure 3 Schematic partial enlarged view of part E.

[0030] In the figure: 1, base; 11, punching table; 111, lower die; 1111, positioning groove; 112, positioning hole; 12, lifting frame; 13, lifting plate; 131, upper die; 14, hydraulic cylinder; 2, counter-punching assembly; 21, fixing rod; 211, counter-punching hole; 22, counter-punching rod; 23, counter-punching spring; 24, compression block; 3, buffer assembly; 31, buffer seat; 311, upper cavity; 312, lower cavity; 313, connecting hole; 314, through hole; 315, accommodating cavity; 316, mounting groove; 317, accommodating groove; 32, buffer plate; 33, buffer spring; 4, pressing assembly; 41, pressing rod; 42 , pressing rack; 43, pressing gear; 44, rotating gear; 5, gradual change component; 51, screw rod; 52, push block; 521, push hole; 53, connecting pipe; 54, expansion bag ring; 55, screw rod; 56, moving plate; 561, oil flow hole; 57, fixed plate; 571, oil through hole; 6, extrusion component; 61, positioning seat; 611, sliding cavity; 62, positioning rod; 621, push hole; 63, extrusion block; 64, extrusion tube; 65, reset spring; 66, connecting rope; 7, push assembly; 71, driving rack; 72, driving gear; 73, push rod; 731, threaded hole; 74, threaded rod. DETAILED DESCRIPTION

[0031] The present application provides a buffer device for a punching machine.

[0032] See also Figure 1 A buffer device for a stamping machine includes: a stamping table 11 and a lifting frame 12 arranged on the top wall of a base 1, the lifting frame 12 is slidably mounted with a lifting plate 13, and the lifting plate 13 slides in the vertical direction; the bottom wall of the lifting plate 13 is provided with an upper die 131. A hydraulic cylinder 14 is fixedly mounted on the top wall of the lifting frame 12, and the output shaft of the hydraulic cylinder 14 is fixedly connected to the top wall of the lifting plate 13; a lower die 111 is arranged on the top wall of the stamping table 11, and a sheet is placed on the lower die 111 during stamping; then, the hydraulic cylinder 14 is started to push the lifting plate 13 down until the upper die 131 contacts the sheet and stamps the sheet; finally, the lifting plate 13 is pulled up and the sheet is taken away from the lower die 111 to complete the stamping operation.

[0033] See also Figure 1Furthermore, a buffer mechanism is provided between the lifting plate 13 and the lifting frame 12. Since the impact force generated during stamping is relatively large, the buffer mechanism can buffer the impact force at this time, thereby protecting the hydraulic cylinder 14, the upper die 131, the lower die 111 and the stamping table 11 to extend their service life, that is, reduce replacement costs.

[0034] See also Figure 2 and Figure 3 The buffer mechanism includes: an impact component 2, a buffer component 3, a pressing component 4, a gradual component 5, an extrusion component 6 and a pushing component 7.

[0035] See also Figure 4 The hedging assembly 2 includes: a fixed rod 21, a hedging rod 22 and a hedging spring 23. The fixed rod 21 is fixedly connected to the bottom wall of the lifting plate 13, and a hedging hole 211 is provided on the bottom wall of the fixed rod 21; one end of the hedging rod 22 is arranged in the hedging hole 211, and the other end extends out of the hedging hole 211. The hedging spring 23 is fixed to the hedging rod 22 and fixedly connected to the bottom of the hedging hole 211. During the stamping process, the hedging rod 22 will collide with the buffer assembly 3; during this process, the hedging rod 22 is recovered into the hedging hole 211 to compress and deform the hedging spring 23, thereby absorbing the impact force to achieve a buffering effect, thereby forming protection.

[0036] See also Figure 4 Furthermore, the impact assembly 2 also includes: a compression block 24, which is fixed on the bottom wall of the impact rod 22. In the embodiment of the present application, the compression block 24 can be made of rubber material. When the impact rod 22 collides with the buffer assembly 3, the compression block 24 will be compressed and deformed. During the deformation process, the impact force is absorbed to achieve a buffering effect.

[0037] See also Figure 3 and Figure 5 The buffer assembly 3 includes: a buffer seat 31, a buffer plate 32 and a buffer spring 33. The buffer seat 31 is fixed on the side wall of the lifting frame 12 and is located directly below the impact rod 22. The buffer seat 31 is provided with an upper cavity 311 and a lower cavity 312. The upper cavity 311 and the lower cavity 312 are filled with silicone oil, and a connecting hole 313 is provided between the upper cavity 311 and the lower cavity 312. The inner top wall of the upper cavity 311 is penetrated with a through hole 314 for the impact rod 22 to pass through. See also Figure 3 and Figure 5The buffer plate 32 is located in the upper cavity 311 and can move in the vertical direction. The buffer spring 33 is fixed between the buffer plate 32 and the inner bottom wall of the upper cavity 311. The buffer spring 33 is used to support the buffer plate 32. During stamping, the punch rod 22 will penetrate the penetration hole 314 and collide with the buffer plate 32 to press the buffer plate 32 downward; during the pressing process, the buffer plate 32 can squeeze the silicone oil in the upper cavity 311 into the lower cavity 312, and the impact force can be converted and absorbed in this process, and the buffer spring 33 is deformed due to the pressure, thereby further absorbing the impact force to achieve a buffering effect.

[0038] See also Figure 5 In the embodiment of the present application, there are two pressing components 4 and two gradual components 5, and the gradual component 5 includes: a screw 51, a push block 52, a connecting pipe 53 and an expansion bag ring 54. The buffer seat 31 is provided with a receiving chamber 315, and a mounting groove 316 is provided on the side of the receiving chamber 315 close to the connecting hole 313; the push block 52 is slidably arranged in the mounting groove 316, and silicone oil is filled between the push block 52 and the bottom of the mounting groove 316. A push hole 521 is provided on the side of the push block 52 away from the connecting hole 313, one end of the screw 51 is rotatably installed in the mounting groove 316 and extends into the receiving chamber 315, and the other end is threadedly connected to the pushing hole 521.

[0039] See also Figure 5 , the expansion bag ring 54 is fixed in the connecting hole 313. In the embodiment of the present application, two gradient components 5 share one expansion bag ring 54, that is, the expansion bag ring 54 is set as a single one, and the expansion bag ring 54 can be made of rubber material or latex. One end of the connecting pipe 53 is connected to the expansion bag ring 54, and the other end is connected to the mounting groove 316. During the downward pressing process of the buffer plate 32, the pressing component 4 drives the screw rod 51 to rotate so that the push block 52 approaches the expansion bag ring 54, that is, the silicone oil is pressed into the expansion bag ring 54, so that the volume of the expansion bag ring 54 gradually increases to reduce the space for the oil to pass through the connecting hole 313, so as to more effectively absorb the impact force and better achieve the buffering effect.

[0040] See also Figure 5 Further, the gradual change component 5 also includes: a screw 55, a moving plate 56 and a fixed plate 57. A receiving groove 317 is provided between the receiving chamber 315 and the connecting hole 313. One end of the moving plate 56 is arranged in the receiving groove 317, and the other end is arranged in the connecting hole 313. An oil flow hole 561 is provided through the top wall of one end of the moving plate 56 located in the connecting hole 313, and a moving hole is provided on the side of the moving plate 56 away from the connecting hole 313. One end of the screw 55 is rotatably installed in the receiving groove 317 and extends into the receiving chamber 315, and the other end is threadedly connected to the moving hole.

[0041] See also Figure 5The fixed plate 57 is fixed in the connecting hole 313, and an oil hole 571 is formed through the top wall of the fixed plate 57. In the embodiment of the present application, two gradient components 5 share one fixed plate 57, that is, the fixed plate 57 is provided as a single piece, and the fixed plate 57 is located between the two movable plates 56. During the downward pressing process of the buffer plate 32, the pressing component 4 drives the screw 55 to rotate to drive the movable plate 56 to be recovered into the accommodating groove 317, so that the oil flow hole 561 and the oil hole 571 will be staggered to further reduce the oil passage space of the connecting hole 313, thereby more effectively absorbing the impact force to better achieve the buffering effect.

[0042] See also Figure 5 The pressing assembly 4 includes: a pressing rod 41, a pressing rack 42, a pressing gear 43 and a rotating gear 44, and the pressing rack 42 is arranged in the accommodating cavity 315; one end of the pressing rod 41 is fixed to the bottom wall of the buffer plate 32, and the other end passes through the accommodating cavity 315 and is fixedly connected to the pressing rack 42.

[0043] See also Figure 5 The pressing gear 43 is coaxially sleeved on the screw rod 51, the rotating gear 44 is coaxially sleeved on the screw rod 55, and the pressing rack 42 is meshed with the pressing gear 43 and the rotating gear 44. When the buffer plate 32 is pressed down, the pressing rod 41 drives the pressing rack 42 to move downward to drive the pressing gear 43 and the rotating gear 44 to rotate, so that the screw rod 51 and the screw rod 55 can rotate automatically.

[0044] See also Figure 6 and Figure 7 The extrusion assembly 6 includes: a positioning seat 61, a positioning rod 62, an extrusion block 63, an extrusion tube 64 and a return spring 65. The positioning seat 61 is fixed on the top wall of the stamping table 11, and the positioning rod 62 is fixed on the top wall of the positioning seat 61; a positioning groove 1111 and a positioning groove 1111 are opened on the lower mold 111, the positioning seat 61 is arranged in the positioning groove 1111, and the positioning rod 62 is arranged in the positioning hole 112. The positioning seat 61 and the positioning rod 62 can quickly position the lower mold 111 to quickly complete the installation of the lower mold 111.

[0045] See also Figure 6 and Figure 7 The positioning seat 61 is provided with a sliding cavity 611, and the extrusion block 63 is slidably arranged in the sliding cavity 611 and slides along the length direction of the sliding cavity 611; the reset spring 65 is fixed between the extrusion block 63 and the inner side wall of the sliding cavity 611, and the reset spring 65 is used to reset the extrusion block 63. One end of the extrusion tube 64 is connected to the sliding cavity 611, and the other end is connected to the lower cavity 312. When the buffer plate 32 squeezes the silicone oil, the silicone oil can enter the sliding cavity 611 from the extrusion tube 64 to push the extrusion block 63; in this process, the reset spring 65 is deformed to absorb the impact force, thereby achieving a buffering effect.

[0046] See also Figure 6 and Figure 7 The push assembly 7 includes: a driving rack 71, a driving gear 72, a push rod 73 and a threaded rod 74. The top wall of the positioning rod 62 is penetrated with a square push hole 621; the push rod 73 is arranged in the push hole 621, and the push rod 73 is square. The bottom wall of the push rod 73 is provided with a threaded hole 731, one end of the threaded rod 74 is rotatably installed in the sliding cavity 611, and the other end passes through the push hole 621 and is threadedly connected to the threaded hole 731.

[0047] See also Figure 6 and Figure 7 The driving rack 71 is fixedly connected to the extrusion block 63, and the driving gear 72 is coaxially sleeved on one end of the threaded rod 74 located in the sliding cavity 611, and the driving rack 71 is meshed with the driving gear 72. When the extrusion block 63 moves and the upper mold 131 has not completely stamped the plate onto the lower mold 111, the driving rack 71 drives the driving gear 72 to rotate, so that the threaded rod 74 rotates to drive the ejector rod 73 to move downward and be completely received in the ejector hole 621, so as not to easily affect the stamping operation; after the upper mold 131 moves up, the reset spring 65 pulls the extrusion block 63 to reset. At this time, the driving rack 71 drives the driving gear 72 to rotate in the opposite direction, so that the threaded rod 74 rotates to drive the ejector rod 73 to move upward and lift the plate, so that it is easier for the operator to take the plate.

[0048] See also Figure 6 and Figure 7 Furthermore, the extrusion assembly 6 also includes: a connecting rope 66, one end of which is fixedly connected to one side of the extrusion block 63 close to the reset spring 65, and the other end is passed through the connecting pipe 53 and the connecting hole 313 and fixedly connected to the buffer plate 32, and the buffer spring 33 and the reset spring 65 are used together to ensure that the extrusion block 63 is pulled to reset.

[0049] In the embodiment of the present application, rubber sleeves (not shown in the figure) may be provided on the buffer plate 32 , the pressing rod 41 , the moving plate 56 , the squeezing block 63 and the connecting rope 66 to improve the sealing performance.

[0050] The working principle of a buffer device for a stamping machine of the present application when in use is specifically as follows: during stamping, the punch rod 22 will penetrate the penetration hole 314 and collide with the buffer plate 32 to press the buffer plate 32 downward; during the pressing process, the buffer plate 32 can squeeze the silicone oil in the upper cavity 311 into the lower cavity 312, and in this process, the impact force can be converted and absorbed, and the buffer spring 33 is deformed due to the pressure, thereby further absorbing the impact force to achieve a buffering effect.

[0051] 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 buffer device for a punching machine, characterized in that: include: A punching table (11) and a lifting frame (12) are arranged on a base (1); a lifting plate (13) is slidably mounted on the lifting frame (12), and an upper die (131) is arranged on the lifting plate (13); a hydraulic cylinder (14) is arranged on the lifting frame (12), and an output shaft of the hydraulic cylinder (14) is fixedly connected to the lifting plate (13); a lower die (111) is arranged on the punching table (11), and a buffer mechanism is arranged between the lifting plate (13) and the lifting frame (12).

2. The buffer device for a punching machine according to claim 1, characterized in that: The buffer mechanism comprises: a hedging component (2) and a buffer component (3); the hedging component (2) comprises: a fixed rod (21), a hedging rod (22) and a hedging spring (23); the fixed rod (21) is fixed on the lifting plate (13); a hedging hole (211) is provided on the fixed rod (21); an end of the hedging rod (22) is arranged in the hedging hole (211); the hedging spring (23) is fixed between the hedging rod (22) and the bottom of the hedging hole (211); and the buffer component (3) is arranged on the lifting frame (12).

3. The buffer device for a punching machine according to claim 2, characterized in that: The buffer assembly (3) comprises: a buffer seat (31), a buffer plate (32) and a buffer spring (33); the buffer seat (31) is fixed on the lifting frame (12); an upper chamber (311) and a lower chamber (312) for storing silicone oil are provided on the buffer seat (31); a connecting hole (313) is provided between the upper chamber (311) and the lower chamber (312); a through hole (314) is provided through the inner wall of the upper chamber (311) for the punch rod (22) to pass through; the buffer plate (32) is arranged in the upper chamber (311); and the buffer spring (33) is fixed between the buffer plate (32) and the inner wall of the upper chamber (311).

4. The buffer device for a punching machine according to claim 2, characterized in that: The hedging assembly (2) further comprises: a compression block (24), wherein the compression block (24) is fixed on the hedging rod (22).

5. The buffer device for a punching machine according to claim 3, characterized in that: The buffer mechanism also includes: a pressing component (4) and a gradual change component (5), the pressing component (4) includes: a pressing rod (41), a pressing rack (42), a pressing gear (43) and a rotating gear (44), the buffer seat (31) is provided with a accommodating cavity (315), the pressing rack (42) is arranged in the accommodating cavity (315), the pressing gear (43) and the rotating gear (44) are both arranged on the gradual change component (5), and the pressing rack (42) is meshed with the pressing gear (43) and the rotating gear (44), one end of the pressing rod (41) is fixed to the buffer plate (32), and the other end passes through the accommodating cavity (315) and is fixedly connected to the pressing rack (42).

6. The buffer device for a punching machine according to claim 5, characterized in that: The gradual change component (5) comprises: a screw rod (51), a push block (52), a connecting pipe (53) and an expansion bag ring (54); the inner wall of the accommodating chamber (315) is provided with a mounting groove (316); the push block (52) is arranged in the mounting groove (316); and a pushing hole (521) is arranged on the push block (52); one end of the screw rod (51) is rotatably installed in the mounting groove (316) and the other end is threadedly connected in the pushing hole (521); the pressing gear (43) is coaxially sleeved on the screw rod (51); the expansion bag ring (54) is fixed in the connecting hole (313); and the connecting pipe (53) is arranged to communicate between the expansion bag ring (54) and the mounting groove (316).

7. The buffer device for a punching machine according to claim 6, characterized in that: The gradual change component (5) further comprises: a screw rod (55), a movable plate (56) and a fixed plate (57); a containing groove (317) is provided between the containing cavity (315) and the connecting hole (313); one end of the movable plate (56) is arranged in the containing groove (317) and the other end is arranged in the connecting hole (313); a moving hole and an oil flow hole (561) are provided on the movable plate (56); one end of the screw rod (55) is rotatably installed in the containing groove (317) and the other end is threadedly connected in the moving hole; the rotating gear (44) is coaxially sleeved on the screw rod (55); the fixed plate (57) is fixed in the connecting hole (313), and an oil flow hole (571) is provided through the fixed plate (57).

8. The buffer device for a punching machine according to claim 3, characterized in that: The buffer mechanism further comprises: an extrusion assembly (6) and a push assembly (7); the extrusion assembly (6) comprises: a positioning seat (61), a positioning rod (62), an extrusion block (63), an extrusion tube (64) and a return spring (65); the positioning seat (61) is fixed on the punching platform (11), and the positioning rod (62) is fixed on the positioning seat (61); a positioning groove (1111) and a positioning hole (112) are provided on the lower die (111); the positioning seat (61) is arranged in the positioning groove (1111) The positioning rod (62) is arranged in the positioning hole (112), a sliding cavity (611) is opened on the positioning seat (61), the extrusion block (63) is arranged in the sliding cavity (611), and the return spring (65) is fixed between the extrusion block (63) and the inner wall of the sliding cavity (611), the extrusion tube (64) is arranged between the sliding cavity (611) and the lower cavity (312), and the push assembly (7) is arranged between the positioning rod (62) and the extrusion block (63).

9. The buffer device for a punching machine according to claim 8, characterized in that: The push assembly (7) comprises: a driving rack (71), a driving gear (72), a push rod (73) and a threaded rod (74); a push hole (621) is formed through the positioning rod (62); the push rod (73) is arranged in the push hole (621); and a threaded hole (731) is formed on the push rod (73); one end of the threaded rod (74) is rotatably mounted in the sliding cavity (611) and the other end is threadedly connected to the push hole (621); the driving gear (72) is coaxially sleeved on the driving rod; the driving rack (71) is fixed to the extrusion block (63), and the driving rack (71) is meshed with the driving gear (72).

10. The buffer device for a punching machine according to claim 8, characterized in that: The extrusion assembly (6) further comprises: a connecting rope (66), one end of the connecting rope (66) being fixed to the extrusion block (63) and the other end of the connecting rope (66) being fixed to the buffer plate (32).

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