Punching device for hydraulic cylinder piston

Abstract

The invention relates to the technical field of workpiece punching, in particular to a hydraulic cylinder piston punching device which comprises a machining table, a first conveying mechanism, a punching mechanism, a tapping mechanism and a second conveying mechanism are sequentially arranged along the edge of the machining table, and the machining table comprises a rotatable lifting assembly. A workbench of a cross structure is installed on the rotatable lifting assembly, and clamping assemblies are arranged at the four corners of the workbench. The first conveying mechanism and the second conveying mechanism are arranged on the machining table to achieve automatic feeding and discharging of pistons, the tapping mechanism is additionally arranged on the machining table to achieve tapping after tapping, and finally the whole production line is circulated through rotation of the machining table, so that the production efficiency is improved, the cost is reduced, and the production efficiency is improved. And the labor intensity of personnel is also reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of workpiece punching, and in particular relates to a punching device for a hydraulic cylinder piston. Background Art

[0002] The piston is an important component of the hydraulic cylinder. The piston is mainly used to connect with the piston rod and then installed together with the cylinder barrel of the piston hydraulic cylinder. In the piston production process, it is necessary to first use a punching device to drill a hole in the piston, and then process the inner side of the hole into an internal thread, so that the piston can be connected to the piston rod; The prior art CN216680287U discloses a drilling device for hydraulic component production. The device can accurately locate the drilling position by setting a laser irradiation lamp; by setting a spray hood, the generated smoke can be dusted; by setting a pressure nozzle, the generated debris can be flushed, cleaned and collected, reducing the labor intensity of the staff.

[0003] However, the degree of automation of the above-mentioned punching equipment is still relatively low, and manual loading and unloading is still required. In addition, the above-mentioned punching device can only punch holes in the piston. If the inner side of the hole is subsequently processed into an internal thread, it is still necessary to manually transfer it to the tapping mechanism for further operation. This is not only inefficient, but also has a high labor intensity for workers. Summary of the invention

[0004] The object of the present invention is to provide a punching device for a hydraulic cylinder piston to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a punching device for a hydraulic cylinder piston, comprising a processing table, along the edge of which a first conveying mechanism, a punching mechanism, a tapping mechanism and a second conveying mechanism are arranged in sequence, the processing table comprises a rotatable lifting assembly, a cross-structured workbench is installed on the rotatable lifting assembly, and clamping assemblies are provided on the four corners of the workbench.

[0006] Preferably, the first conveying mechanism and the second conveying mechanism have the same structure, including a conveyor belt, a fixing frame is installed on the conveyor belt, a manipulator is installed on the fixing frame, and the manipulator is installed near the workbench.

[0007] Preferably, the rotatable lifting assembly includes a frame, a mounting frame is provided in the middle of the frame, a support block is provided above the mounting frame, a mounting hole is opened on the mounting frame, a driven gear is provided in the mounting hole, a lifting mechanism is installed in the mounting hole, the end of the lifting mechanism passes through the support block and is connected to the workbench, two auxiliary telescopic rods are further provided below the workbench, and the bottoms of the two auxiliary telescopic rods are fixed on the driven gear. A first driving assembly is installed on one side of the frame, and the first driving assembly is used to drive the driven gear to rotate. A second driving assembly is installed on the other side of the frame, and the second driving assembly is used to drive the lifting mechanism to move up and down.

[0008] Preferably, the lifting mechanism comprises a screw rod, the screw rod is installed in the installation hole, the bottom of the screw rod is connected to a first gear, a movable sleeve is sleeved on the screw rod, and the movable sleeve passes through the support block and is connected to the workbench; The second driving assembly includes a second rotating motor, which is transversely fixed on the frame. The rotating shaft of the second rotating motor passes through the frame and is connected to the second gear, and the second gear is meshed with the first gear.

[0009] Preferably, the first driving assembly includes a first rotating motor, which is vertically fixed on a frame, and a driving gear is connected to the end of a rotating shaft of the second rotating motor, and the driving gear is meshed with a driven gear.

[0010] Preferably, the clamping assembly comprises an arc-shaped placement rack, a limit plate is extended from the rear side of the arc-shaped placement rack, a through hole is provided in the middle of the limit plate, and a group of clamps are provided on both sides of the arc-shaped placement rack. The clamp comprises a bracket, a cylinder is fixed on the bracket, and a ejector pin is arranged at the end of the piston rod of the cylinder.

[0011] Preferably, the manipulator comprises a hydraulic rod, a first mechanical arm and a second mechanical arm, the hydraulic rod is mounted on the upper end of a fixed frame, a piston rod of the hydraulic rod passes through the fixed frame and is connected to the first mechanical arm, a rotating shaft passes through the interior of the first mechanical arm, a small gear is arranged on one end of the rotating shaft, a small rotating motor is installed inside the first mechanical arm, a rotating shaft of the small rotating motor passes through the first mechanical arm and is connected to an outer driving gear, and the driving gear is meshed with the small gear; The second mechanical arm is designed in a U-shaped structure, and both ends of the second mechanical arm are connected to corresponding rotating shafts. A gripper is also provided under the second mechanical arm. Preferably, the gripper comprises a housing, the housing is fixed below the second mechanical arm, two symmetrical worm gears are arranged inside the housing, each of the worm gears is connected to a clamp arm, the end of the clamp arm extends out of the housing, a worm is meshed between the two worm gears, and the rotating shaft of the worm is connected to a forward and reverse motor. A vacuum nozzle is also provided at the end of each clamp arm, and each vacuum nozzle is connected to an exhaust pipe. After the exhaust pipe passes through the inner side of the clamp arm, it is connected to a vacuum pump, and the vacuum pump is fixed on the shell.

[0012] Preferably, the punching mechanism comprises a first body, a first hydraulic rod is provided on the first body, a punching machine is installed on the piston rod of the first hydraulic rod, and the drill head of the punching machine is replaceable.

[0013] Preferably, the tapping mechanism comprises a second body, a second hydraulic rod is provided on the second body, a tapping machine is mounted on the piston rod of the second hydraulic rod, and the tapping head of the tapping machine is replaceable.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention realizes automatic loading and unloading of the piston by arranging the first conveying mechanism and the second conveying mechanism at the processing table, and adds a tapping mechanism at the processing table to realize tapping after the hole is opened; The specially designed processing table can realize three movement modes under the drive of the rotatable lifting component. It can not only drive the worktable to rotate and lift at the same time, but also rotate alone, or lift alone. In this way, the different movement modes of the processing table can be used to drive the workpiece to pass through the corresponding equipment in sequence and carry out different processing steps, so that the entire production line can be cyclically produced; In summary, the present invention has a high degree of automation, can improve production efficiency, reduce costs, and also reduce labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention after rotation; Figure 3 It is a structural schematic diagram of the processing table of the present invention; Figure 4 It is a structural schematic diagram of the rotatable lifting assembly of the present invention; Figure 5 It is a partial cross-sectional schematic diagram of the rotatable lifting assembly of the present invention; Figure 6 It is a structural schematic diagram of the arc-shaped placement rack of the present invention; Figure 7 It is a structural schematic diagram of the clamp of the present invention; Figure 8 It is a structural schematic diagram of the conveying mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the manipulator of the present invention; Fig.10 A schematic diagram of the connection between the first mechanical arm and the second mechanical arm of the present invention; Fig.11 It is a schematic cross-sectional view of the structure of the grabbing clamp of the present invention; Fig.12 It is a structural schematic diagram of the grabbing clamp of the present invention; Fig.13 It is a structural schematic diagram of the punching mechanism of the present invention; Fig.14 It is a structural schematic diagram of the tapping mechanism of the present invention; In the figure: processing table-1, first conveying mechanism-2, punching mechanism-3, tapping mechanism-4, second conveying mechanism-5, rotatable lifting component-11, workbench-12, clamping component-13, frame-111, mounting frame-112, support block-113, mounting hole-114, driven gear-115, lifting mechanism-116, first driving component-117, second driving component-118, auxiliary telescopic rod-121, screw-1161, first gear-1162, movable sleeve-1163, first rotating motor-1171, driving gear-1172, second rotating motor-1181, second gear-1182, arc-shaped placement frame-131, limit plate-132, through hole-133, clamp Tool-134, bracket-1341, cylinder-1342, ejector-1343, conveyor belt-21, fixed frame-22, manipulator-23, hydraulic rod-231, first manipulator arm-232, second manipulator arm-233, gripper-234, rotating shaft-2321, small gear-2322, small rotating motor-2323, driving gear-2324, housing-2341, worm gear-2342, clamp arm-2343, worm-2344, forward and reverse motor-2345, vacuum nozzle-2346, exhaust pipe-2347, vacuum pump-2348, first body-31, first hydraulic rod-32, punching machine-34, second body-41, second hydraulic rod-42, tapping machine-44. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-2The present invention provides a technical solution: a punching device for a hydraulic cylinder piston, comprising a processing table 1, and a first conveying mechanism 2, a punching mechanism 3, a tapping mechanism 4 and a second conveying mechanism 5 are sequentially arranged along the edge of the processing table 1. The piston is first conveyed to the processing table by the first conveying mechanism, and then the processing table transfers the piston to the punching mechanism for punching. After the punching is completed, the processing table continues to transfer the piston to the tapping mechanism, and processes the inner side surface of the hole into an internal thread. Then the processing table drives the piston to the second conveying mechanism again, and finally the second conveying mechanism removes it from the processing table and then transfers the material.

[0018] like Figure 3 As shown, in this embodiment, the processing table 1 includes a rotatable lifting component 11, on which a cross-structured workbench 12 is mounted. The rotatable lifting component 11 is used to drive the workbench to perform three modes of movement, including single rotation or single lifting, and simultaneous rotation and lifting; Then, a clamping assembly 13 is provided on each of the four corners of the workbench 12 for positioning the piston; like Figure 4 As shown, the rotatable lifting assembly 11 includes a frame 111, a mounting frame 112 is arranged in the middle of the frame 111, and a support block 113 is arranged above the mounting frame 112, and then the driven gear 115 is sleeved on the mounting frame 112. Then, a mounting hole 114 is opened on the mounting frame 113, and the bottom of the lifting mechanism 116 is installed in the mounting hole 114. At the same time, the end of the lifting mechanism 116 passes through the support block 113 and is rotatably connected to the workbench 12. In addition, two auxiliary telescopic rods 121 are provided below the workbench 12, and the bottoms of the two auxiliary telescopic rods 121 are fixed on the driven gear 115. A first driving assembly 117 is installed on one side of the frame 111. The first driving assembly 117 is used to drive the driven gear 115 to rotate. A second driving assembly 118 is installed on the other side of the frame 111, and the second driving assembly 118 is used to drive the lifting mechanism 116 to move up and down; like Figure 4-5 As shown, the first driving assembly 117 comprises a first rotating motor 1171 (the first rotating motor supports forward and reverse rotation), the first rotating motor 1171 is vertically fixed on the frame 111, and the end of the rotating shaft of the second rotating motor 1171 is connected with a driving gear 1172, and the driving gear 1172 is meshed with the driven gear 115. When the first rotating motor 1171 is started, the driving gear 1172 is driven to rotate, thereby driving the driven gear 115 to rotate. During the rotation of the driven gear 115, the two auxiliary telescopic rods 121 drive the workbench to rotate together; like Figure 4-5 As shown, the lifting mechanism 116 includes a screw rod 1161, the screw rod 1161 is transferred to the mounting hole 114, and a first gear 1162 is connected to the bottom of the screw rod 1161, and then a movable sleeve 1163 is sleeved on the screw rod 1161, and the movable sleeve 1163 passes through the support block 113 and is rotatably connected to the workbench 12; In addition, the second driving assembly 118 includes a second rotating motor 1181 (the second rotating motor supports forward and reverse rotation), the second rotating motor 1181 is transversely fixed on the frame 111, and the rotating shaft of the second rotating motor 1181 passes through the frame and is connected to the second gear 1182, and at the same time, the second gear 1182 and the first gear 1162 are ensured to be meshed with each other. When the second rotating motor is started, the second gear is driven to rotate, thereby driving the first gear to rotate, and at this time the screw rod will also rotate accordingly, so that the movable sleeve sleeved on the screw rod can realize lifting; like Figure 6-7 As shown, the clamping assembly 13 includes an arc-shaped placement frame 131 (with a groove), a limit plate 132 is extended from the rear side of the arc-shaped placement frame 131, a through hole 133 is opened in the middle of the limit plate 132, and a set of clamps 134 are arranged on both sides of the arc-shaped placement frame 131 for fixing the clamping piston. The clamp 134 comprises a bracket 1341 on which a cylinder 1342 is fixed, and a pin 1343 is arranged at the end of the piston rod of the cylinder 1342. The pins on both sides are pushed closer to each other for clamping or farther away from each other for loosening by the extension and contraction of the cylinder.

[0019] In this embodiment, the first conveying mechanism 2 and the second conveying mechanism 5 have the same structure. Figure 8 As shown, it includes a conveyor belt 21 (the conveyor belt 21 is provided with a plurality of placement racks for placing pistons), a fixed rack 22 is installed on the conveyor belt 21, and a manipulator 23 is installed on the fixed rack 22, and it is ensured that the manipulator 23 is installed near the workbench 12; when the conveyor belt transports the piston to the manipulator, the manipulator clamps the piston and places it on the workbench 12; like Figure 9-10 As shown, the manipulator 23 includes a hydraulic rod 231, a first mechanical arm 232 and a second mechanical arm 233. The hydraulic rod 231 is first installed on the upper end of the fixed frame 22, and then the piston rod of the hydraulic rod 231 passes through the fixed frame 22 and is connected to the first mechanical arm 232. Then, the rotating shaft 2321 passes through the first mechanical arm 232, and a small gear 2322 is set on one end of the rotating shaft 2321. In addition, a small rotating motor 2323 is installed inside the first mechanical arm 232. The rotating shaft of the small rotating motor 2323 passes through the first mechanical arm 232 and is connected to the driving gear 2324 on the outside. The driving gear 2324 is meshed with the small gear 2322. The second mechanical arm 233 is designed in a U-shaped structure, and the two ends of the second mechanical arm 233 are connected to the corresponding rotating shaft 2321, and a gripper 234 is provided under the second mechanical arm 233; When working, the two mechanical arms and the gripper are mainly driven up and down by the hydraulic rod. The gripper is used to clamp the piston, and the driving gear 2324 is driven to rotate by the small rotating motor 2323 to drive the small gear 2322 to rotate, so that the second mechanical arm 233 is lifted; like Figure 11-12 As shown, the above-mentioned gripper 234 includes a shell 2341, which is fixed below the second mechanical arm 233. Two symmetrical worm gears 2342 are arranged inside the shell 2341, and each worm gear 2342 is connected to a clamping arm 2343, and the end of the clamping arm 2343 extends out of the outer side of the shell 2341. A worm 2344 is meshed between the two worm gears 2342, and the rotating shaft of the worm 2344 is connected to a forward and reverse motor 2345. When the forward and reverse motor 2345 rotates forward to drive the worm to rotate, it will simultaneously drive one worm gear to rotate clockwise and the other worm gear to rotate counterclockwise, so that the two clamping arms are opened to both sides respectively; when the forward and reverse motor 2345 rotates reversely to drive the worm to rotate, it will also drive one worm gear to rotate clockwise and the other worm gear to rotate counterclockwise, so that the two clamping arms are close to each other and clamped; In addition, a vacuum suction nozzle 2346 is provided at the end of each clamping arm 2343, and each vacuum suction nozzle 2346 is connected to an exhaust pipe 2347. After the exhaust pipe 2347 passes through the inner side of the clamping arm 2343, it is connected to a vacuum pump 2348 fixed on the shell 2341. The vacuum pump can be used to evacuate air, so that the vacuum suction nozzle can tightly adsorb the piston.

[0020] like Fig.13 As shown, in this embodiment, the punching mechanism 3 includes a first body 31, a first hydraulic rod 32 is provided on the first body 31, a punching machine 34 is installed on the piston rod of the first hydraulic rod 32, and the punching machine 34 corresponds to the piston on the clamping assembly 13 so as to drill holes in the piston. In addition, the drill head is replaceable, so that the corresponding drill bit can be selected according to the actual hole diameter.

[0021] like Fig.14As shown, in this embodiment, the tapping mechanism 4 includes a second body 41, a second hydraulic rod 42 is provided on the second body 41, a tapping machine 44 is installed on the piston rod of the second hydraulic rod 42, and the tapping head of the tapping machine 44 is replaceable, so that the corresponding tapping head can be selected according to the actual hole diameter.

[0022] Working principle: The first conveying mechanism is used as a loading device. The worker puts the piston to be processed on the conveyor belt. As the conveyor belt is transported to the bottom of the manipulator, the hydraulic rod drives the two manipulator arms and the gripper to move downward until the gripper approaches and clamps the piston. Then the small rotary motor starts, and the driving gear drives the small gear to rotate to lift the second manipulator arm 233 until it bends into an L shape (during the movement of the manipulator, the workbench is in an "X" shape to facilitate the bending movement of the manipulator). Then the hydraulic rod drives the whole to move upward again, so that the clamped piston is placed on the top of the workbench, and then the workbench can be rotated (after rotation, the workbench is in a "cross" shape). At this time, the clamping mechanism is exactly on the same vertical line as the piston, so that when the hydraulic rod descends again, the piston can be placed on the clamping mechanism; After the piston is placed on the clamping mechanism, the clamps on both sides clamp the two sides of the piston, and then the processing table rotates again while making appropriate lifting and lowering adjustments so that the piston on the workbench corresponds to the punching machine of the punching mechanism; Then the first hydraulic rod pushes the punching machine forward to drill a hole in the piston. After the drilling is completed, the processing table rotates again and performs appropriate lifting and lowering adjustments so that the piston on the workbench corresponds to the tapping machine of the tapping mechanism; Then the second hydraulic cylinder pushes the tapping machine forward to process the internal thread on the inside of the piston. After the tapping is completed, the processing table rotates again (when the table rotates in an "X" shape, the manipulator on the second conveying mechanism is ready to move first). When the table rotates in a "cross" shape again, the piston can be aligned with the manipulator of the second conveying mechanism; finally, the manipulator of the second conveying mechanism takes down the processed piston and puts it on the conveyor belt for unloading; Through the above-mentioned fully automatic processing method, the processing operation can be carried out in an uninterrupted cycle, which not only improves production efficiency and reduces costs, but also reduces the labor intensity of personnel.

[0023] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A punching device for a hydraulic cylinder piston, comprising a processing table (1), characterized in that: A first conveying mechanism (2), a punching mechanism (3), a tapping mechanism (4) and a second conveying mechanism (5) are sequentially arranged along the edge of the processing table (1); the processing table (1) comprises a rotatable lifting assembly (11); a cross-structured workbench (12) is mounted on the rotatable lifting assembly (11); and clamping assemblies (13) are arranged on the four corners of the workbench (12); The rotatable lifting assembly (11) comprises a frame (111), a mounting frame (112) is provided in the middle of the frame (111), a support block (113) is provided above the mounting frame (112), a mounting hole (114) is provided on the mounting frame (113), a driven gear (115) is sleeved on the outer periphery of the mounting frame (112), a lifting mechanism (116) is installed in the mounting hole (114), an end of the lifting mechanism (116) passes through the support block (113) and is connected to a workbench (12), and at least two auxiliary telescopic rods (121) are further provided below the workbench (12), and the bottom of the auxiliary telescopic rod (121) is fixed to the driven gear (115).

2. A punching device for a hydraulic cylinder piston according to claim 1, characterized in that: The first conveying mechanism (2) and the second conveying mechanism (5) have the same structure, comprising a conveying belt (21), a fixing frame (22) being mounted on the conveying belt (21), a manipulator (23) being mounted on the fixing frame (22), and the manipulator (23) being mounted near the workbench (12).

3. A punching device for a hydraulic cylinder piston according to claim 1, characterized in that: A first driving assembly (117) is installed on one side of the frame (111), and the first driving assembly (117) is used to drive the driven gear (115) to rotate. A second driving assembly (118) is installed on the other side of the frame (111), and the second driving assembly (118) is used to drive the lifting mechanism (116) to move up and down.

4. A punching device for a hydraulic cylinder piston according to claim 3, characterized in that: The lifting mechanism (116) comprises a screw rod (1161), the screw rod (1161) is installed in the installation hole (114), the bottom of the screw rod (1161) is connected to a first gear (1162), and a movable sleeve (1163) is sleeved on the screw rod (1161), and the movable sleeve (1163) passes through the support block (113) and is connected to the workbench (12); The second driving assembly (118) comprises a second rotating motor (1181), the second rotating motor (1181) is transversely fixed to the frame (111), a rotating shaft of the second rotating motor (1181) passes through the frame and is connected to a second gear (1182), and the second gear (1182) is meshed with the first gear (1162).

5. A punching device for a hydraulic cylinder piston according to claim 3, characterized in that: The first driving assembly (117) comprises a first rotating motor (1171), the first rotating motor (1171) being vertically fixed on the frame (111), the end of the rotating shaft of the second rotating motor (1171) being connected to a driving gear (1172), the driving gear (1172) being meshed with the driven gear (115).

6. A punching device for a hydraulic cylinder piston according to claim 1, characterized in that: The clamping assembly (13) comprises an arc-shaped placement frame (131), a limit plate (132) extending from the rear side of the arc-shaped placement frame (131), a through hole (133) being provided in the middle of the limit plate (132), and a group of clamps (134) being provided on both sides of the arc-shaped placement frame (131). The clamp (134) comprises a bracket (1341), a cylinder (1342) is fixed on the bracket (1341), and a thimble (1343) is provided at the end of the piston rod of the cylinder (1342).

7. A punching device for a hydraulic cylinder piston according to claim 2, characterized in that: The manipulator (23) comprises a hydraulic rod (231), a first mechanical arm (232) and a second mechanical arm (233); the hydraulic rod (231) is mounted on the upper end of a fixed frame (22); a piston rod of the hydraulic rod (231) passes through the fixed frame (22) and is connected to the first mechanical arm (232); a rotating shaft (2321) passes through the interior of the first mechanical arm (232); a small gear (2322) is arranged on one end of the rotating shaft (2321); a small rotating motor (2323) is mounted inside the first mechanical arm (232); a rotating shaft of the small rotating motor (2323) passes through the first mechanical arm (232) and is connected to an outer driving gear (2324); the driving gear (2324) is meshed with the small gear (2322); The second mechanical arm (233) is designed to be U-shaped, with two ends of the second mechanical arm (233) connected to corresponding rotating shafts (2321), and a gripper (234) is also provided below the second mechanical arm (233).

8. A punching device for a hydraulic cylinder piston according to claim 7, characterized in that: The gripper (234) comprises a shell (2341), wherein the shell (2341) is fixed below the second mechanical arm (233), and two symmetrical worm gears (2342) are arranged inside the shell (2341), and each of the worm gears (2342) is connected to a clamping arm (2343), and the end of the clamping arm (2343) extends out of the shell (2341), and a worm (2344) is meshed between the two worm gears (2342), and the rotating shaft of the worm (2344) is connected to a forward and reverse motor (2345). A vacuum suction nozzle (2346) is also provided at the end of each clamping arm (2343), and each vacuum suction nozzle (2346) is connected to an exhaust pipe (2347). The exhaust pipe (2347) passes through the inner side of the clamping arm (2343) and is connected to a vacuum pump (2348). The vacuum pump (2348) is fixed on the shell (2341).

9. A punching device for a hydraulic cylinder piston according to claim 1, characterized in that: The punching mechanism (3) comprises a first body (31), a first hydraulic rod (32) being provided on the first body (31), a punching machine (34) being mounted on the piston rod end of the first hydraulic rod (32), and a drill head of the punching machine (34) being replaceable.

10. A punching device for a hydraulic cylinder piston according to claim 1, characterized in that: The tapping mechanism (4) comprises a second machine body (41), a second hydraulic rod (42) being provided on the second machine body (41), a tapping machine (44) being mounted on the piston rod end of the second hydraulic rod (42), and a tapping head of the tapping machine (44) being replaceable.

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