Double-sided milling machine hydraulic tooling

Abstract

The present invention relates to the field of jigs and fixtures, and in particular to a hydraulic jig for a double-sided milling machine. It comprises a frame and a base, wherein it also comprises four jig groups, and the four jig groups comprise a first jig group, a second jig group, a third jig group and a fourth jig group. The first jig group and the second jig group are arranged on the frame, and positioning plates are respectively fixed on both sides along the length direction of the frame. The first jig group and the second jig group are respectively arranged on two positioning plates, and the first jig group and the second jig group are both arranged in the horizontal direction, and the third jig group and the fourth jig group are respectively arranged on the base in the vertical direction. It realizes the clamping of the workpiece through hydraulic pressure, and can always maintain a constant clamping force during the processing, saving manpower and material resources, ensuring that the workpiece is always in a clamped state, improving the clamping effect of the workpiece, and improving the yield rate of milling.

Description

Technical Field

[0001] The invention relates to the field of tooling fixtures, in particular to a hydraulic tooling for a double-sided milling machine. Background Art

[0002] As we all know, before milling a workpiece on a milling machine, the position of the workpiece must be fixed first. At present, fixing the workpiece on a milling machine is generally done manually, that is, the operator tightens the bolts and presses the workpiece tightly on the milling machine through the pressure plate under the bolts, thereby fixing the workpiece. There are the following defects in fixing the workpiece by manual tightening: First, because the tightening force applied by the operator is limited during the tightening operation, sometimes one person cannot complete the tightening and fixing work, and multiple people are required to tighten together to fix the workpiece, which is time-consuming and laborious; second, the operator must stay away from the workpiece during the milling process, so it is impossible to apply continuous tightening force. During the process of the milling cutter milling the workpiece, vibration will be generated, and continuous vibration will cause the bolts to loosen. Therefore, during the milling process, the position of the workpiece is likely to change due to the loosening of the bolts, which directly leads to the generation of scrap and reduces the yield of milling. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and proposes a double-sided milling machine hydraulic tooling, which clamps the workpiece through hydraulic pressure and can always maintain a constant clamping force during the processing process, saving manpower and material resources, ensuring that the workpiece is always in a clamped state, improving the clamping effect of the workpiece, and improving the milling yield rate.

[0004] The technical scheme of the present invention is: a double-sided milling machine hydraulic tooling, including a frame and a base, wherein, it also includes four tooling groups, the four tooling groups include a first tooling group, a second tooling group, a third tooling group and a fourth tooling group, the first tooling group and the second tooling group are arranged on the frame, and positioning plates are respectively fixed on both sides along the length direction of the frame, the first tooling group and the second tooling group are respectively arranged on the two positioning plates, the first tooling group and the second tooling group are both arranged in the horizontal direction, and the third tooling group and the fourth tooling group are respectively arranged on the base and arranged in the vertical direction;

[0005] The first tooling group includes a plurality of first toolings arranged at intervals along the positioning plate, the first tooling includes an oil top, a pull rod, a pressure plate I and a support plate, two support plates are symmetrically fixed on the outer side of the oil top, and the two support plates are respectively provided with pull rods, the oil top includes a cylinder, a plunger, a bottom plate, a support plate and a double-headed screw, an opening is provided at the bottom of the cylinder, and a cylinder cover I is fixed at the opening at the bottom, the plunger is slidably arranged in the cylinder through the opening at the bottom of the cylinder, the bottom of the plunger is fixedly connected to one side of the bottom plate, and the other side of the corresponding bottom edge is fixedly connected to the inner side of the positioning plate, the outer side of the cylinder is symmetrical Two support plates are fixed, and the support plates are arranged in parallel with the bottom plate. The support plates and the bottom plate are connected by a double-headed screw, one end of the double-headed screw is fixedly connected to the bottom plate by a threaded connection, and the other end of the double-headed screw passes through and extends out of the support plate, and a nut is fixed to the end, and a compression spring is arranged between the nut and the support plate. The pull rod passes through the support plate and the positioning plate in sequence, and one end of the pull rod extends into the workpiece outside the positioning plate, and a pressure plate I is fixed to the end of the pull rod extending into the workpiece, and a nut is fixed to the other end of the pull rod, and the nut is located on the inner side of the support plate, and the support plate reciprocates along the axial direction of the double-headed screw;

[0006] The second tooling group includes a second tooling set in an array along the positioning plate at intervals, the second tooling includes two oil tops, a pull rod, a pressure plate II and a support plate, the two oil tops are fixedly connected by a support plate, and at the same time, support plates are respectively fixed on the outer sides of the two oil tops, a pull rod is arranged in the support plate connecting the two oil tops, the cylinder barrels of the two oil tops are fixedly connected by a support plate, support plates are respectively fixed on the outer sides of the two cylinder barrels, a pull rod is arranged in the support plate connecting the two cylinder barrels, one end of the pull rod passes through the support plate and the positioning plate in sequence, and is located on the outer side of the positioning plate, and a pressure plate II is fixed to the end, and a nut is fixed to the other end of the pull rod, and the nut is located on the inner side of the support plate, and the two support plates on the outer sides of the two cylinder barrels are connected to the bottom plate by double-headed screws respectively;

[0007] The third tooling group includes several third toolings arranged at intervals along the length direction of the base, the third tooling includes a single-acting piston cylinder, a pressure plate III and a pull rod II, one end of the pull rod II is connected to the single-acting piston cylinder, and the other end is connected to the pressure plate III, the single-acting piston cylinder includes a cylinder barrel II, a piston rod, a piston and a guide sleeve, a cylinder bottom cover is fixed to the bottom of the cylinder barrel II, a cylinder upper cover is fixed to the top of the cylinder barrel II, the cylinder upper cover is fixedly connected to a washer, a piston and a guide sleeve are arranged in the cylinder barrel II, the piston and the cylinder bottom cover are connected by a compression spring, the piston rod passes through the piston, the guide sleeve, the cylinder upper cover and the washer in sequence, one end of the piston rod is fixedly connected to the piston, the other end of the piston rod extends out of the washer and is fixedly connected to the bottom of the pull rod II, a pressure plate III is fixed to the top of the pull rod II, and the pressure plate III is located above the workpiece.

[0008] In the present invention, a sealing ring I is provided between the inner surface of the bottom of the cylinder and the outer surface of the plunger, and a dustproof ring I is provided between the inner surface of the cylinder cover I and the outer surface of the plunger to prevent external dust from entering the cylinder.

[0009] A sealing ring II is provided between the outer surface of the piston and the inner surface of the cylinder II, an O-ring is provided between the outer surface of the guide sleeve and the inner surface of the cylinder II, a sealing ring III is provided between the inner surface of the guide sleeve and the outer surface of the piston rod, and a dust ring II is provided between the inner surface of the cylinder cover and the piston rod.

[0010] The beneficial effects of the present invention are:

[0011] By setting up four tooling groups, different surfaces of the workpiece are clamped by the tooling groups when processing the workpiece, thereby realizing the milling of each surface of the workpiece. The four tooling groups all use hydraulic pressure to clamp the workpiece, and no manpower is required in the clamping work, which greatly saves manpower and material resources; at the same time, during the milling process of the workpiece, the hydraulic pressure is used to maintain a constant clamping force on the workpiece to prevent the workpiece from moving during the milling process, thereby improving the clamping effect of the workpiece and thus improving the milling efficiency of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of a top view of the structure of the first tooling group and the second tooling group;

[0013] Figure 2 It is a schematic diagram of the structure of the oil top in the first tooling group;

[0014] Figure 3 It is a schematic diagram of the structure of the oil top in the second tooling group;

[0015] Figure 4 It is a schematic diagram of the main structure of the third tooling group;

[0016] Figure 5 It is a structural diagram of the third tooling group;

[0017] Figure 6 It is a structural diagram of a single-acting piston cylinder.

[0018] In the figure: 1 the first tooling group; 2 the second tooling group; 3 the pressure plate II; 4 the workpiece; 5 the positioning plate; 6 the frame; 7 the pressure plate I; 8 the pull rod I; 9 the oil top; 11 the cylinder barrel I; 12 the plunger; 13 the sealing ring I; 14 the support plate; 15 the oil cylinder cover I; 16 the dust ring I; 17 the bottom plate; 18 the compression spring; 19 the double-headed screw; 20 the single-acting piston cylinder; 21 the pressure plate III; 22 the pull rod II; 23 the oil cylinder bottom cover; 24 the cylinder barrel II; 25 the compression spring; 26 the round nut; 27 the piston rod; 28 the piston; 29 the sealing ring II; 30 the guide sleeve; 31 the sealing ring III; 32 the oil cylinder upper cover; 33 the dust ring II; 34 the O-ring; 35 the washer. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] The double-sided milling machine hydraulic tooling described in the present invention is mainly used for milling the six faces of a hexahedral workpiece. When processing different faces, the faces that need to be fixed are different, and the hydraulic tooling used for fixing is also different. Therefore, the present invention includes four tooling groups, a frame and a base. The four tooling groups include a first tooling group 1, a second tooling group 2, a third tooling group and a fourth tooling group. The first tooling group and the second tooling group are arranged on a frame 6, and positioning plates 5 are respectively fixed on both sides along the length direction of the frame 6. The first tooling group 1 and the second tooling group 2 are respectively arranged on the positioning plates 5. The first tooling group 1 and the second tooling group 2 are both arranged in the horizontal direction. The structures of the third tooling group and the fourth tooling group are exactly the same, and they are respectively arranged on the base. The third tooling group and the fourth tooling group are independently arranged from the first tooling group 1 and the second tooling group 2, and are arranged in the vertical direction. As shown in the figure, the workpiece 4 includes six faces, namely face A, face A', face B, face B', face C and face C', wherein face A and face A' are two opposite faces, face B and face B' are two opposite faces, and face C and face C' are two opposite faces. The workpiece 4 is fixed by the first tooling group 1, and face A of the workpiece is milled at this time; the workpiece 4 is fixed by the second tooling group 2, and face A' of the workpiece is milled at this time. The third tooling group fixes the workpiece 4, and the B and B' faces can be milled. The fourth tooling group fixes the workpiece 4, and the C and C' faces can be milled.

[0022] like Figure 1 and Figure 2As shown, the first tooling group 1 includes a plurality of first toolings arranged at intervals along the positioning plate. The first tooling includes an oil top 9, a pull rod 8, a pressure plate Ⅰ7 and a support plate 14. Two support plates 14 are symmetrically fixed on the outer side of the oil top 9. The two support plates 14 are respectively provided with pull rods 8, so each first tooling can achieve the clamping and fixing of two workpieces. The oil top 9 includes a cylinder 11, a plunger 12, a bottom plate 17, a support plate 5 and a double-headed screw 19. The bottom of the cylinder 11 is provided with an opening, and a cylinder cover Ⅰ15 is fixed at the opening at the bottom of the cylinder 11. The plunger 12 is inserted into the cylinder 11 through the opening at the bottom of the cylinder 11, and the plunger 12 can slide in the cylinder 11. A sealing ring Ⅰ13 is provided between the inner surface of the bottom of the cylinder 11 and the outer surface of the plunger 12 to prevent the hydraulic oil in the cylinder 11 from flowing out; a dust ring Ⅰ16 is provided between the inner surface of the cylinder cover Ⅰ15 and the outer surface of the plunger 12 to prevent external dust from entering the cylinder. The bottom of the plunger 12 is fixedly connected to one side of the bottom plate 17, and the other side of the corresponding bottom plate 17 is fixedly connected to the inner side of the positioning plate 5, thereby realizing the connection between the oil top 9 and the positioning plate 5. Two support plates 14 are symmetrically fixed to the outside of the cylinder 11. The support plates 14 and the bottom plate 17 are arranged in parallel. The support plates 14 and the bottom plate 17 are connected by a double-headed screw 19. One end of the double-headed screw 19 is fixedly connected to the bottom plate 17 by a threaded connection. The other end of the double-headed screw 19 passes through and extends out of the support plate 14. A nut is fixed to this end. A compression spring 18 is provided between the nut and the support plate 14. The support plate 14 can reciprocate along the axial direction of the double-headed screw 19.

[0023] The pull rod 8 passes through the support plate 14 and the positioning plate 5 in sequence, and one end of the pull rod 8 extends into the workpiece 4 outside the positioning plate 5. The end of the pull rod 8 extending into the workpiece 4 is fixed with a pressure plate Ⅰ7, and the other end of the pull rod 8 is fixed with a nut located on the inner side of the support plate 14.

[0024] The working process of the first tooling group 1 to complete the workpiece clamping is as follows: the hydraulic oil enters the cylinder 11 along the oil inlet of the cylinder 11. As the amount of hydraulic oil in the cylinder 11 increases, the cylinder 11 moves away from the plunger 12 under the thrust of the hydraulic oil. The cylinder 11 moves while driving the support plate 14 and the pull rod 8 to move away from the plunger 12. The movement of the support plate causes the compression spring 18 to be compressed. While the pull rod 8 drives the pressure plate I7 ​​to move, the pressure plate I7 ​​makes the A' surface of the workpiece close to the positioning plate 5, thereby clamping and fixing the workpiece 4 on the positioning plate 5, and processing the A surface. After the processing is completed, under the elastic force of the compression spring 18, the support plate 14 drives the pull rod 8 to reset, and the workpiece can be removed from the tooling.

[0025] The second tooling group 2 includes a second tooling array arranged at intervals along the positioning plate, and the second tooling includes two oil tops 9, a pull rod 8, a pressure plate II 3 and a support plate 14. The two oil tops 9 are fixedly connected by the support plate 14, and the outer sides of the two oil tops 9 are respectively fixed with support plates 14. A pull rod 8 is arranged inside the support plate 14 connecting the two oil tops 9. The structure of the two oil tops is the same as that of the oil tops in the first tooling group, so it is not repeated here. The cylinder barrels 11 of the two oil tops are fixedly connected by the support plate 14, and the outer sides of the two cylinder barrels 11 are respectively fixed with support plates 14, and the support plate 14 connecting the two cylinder barrels 11 is provided with a pull rod 8. One end of the pull rod 8 passes through the support plate 14 and the positioning plate 5 in sequence, and is located on the outer side of the positioning plate 5. The pressure plate II 3 is fixed to this end, and a nut is fixed to the other end of the pull rod 8, and the nut is located on the inner side of the support plate 14. The two support plates 14 on the outside of the two cylinder barrels 11 are connected to the base plate 17 respectively through a double-headed screw 19. One end of the double-headed screw 19 is fixedly connected to the base plate 17 by a threaded connection. The other end of the double-headed screw 19 passes through and extends out of the support plate 14. A nut is fixed to this end. A compression spring 18 is provided between the nut and the support plate 14. The support plate 14 can reciprocate along the axial direction of the double-headed screw 19.

[0026] The working process of the second tooling group 2 to complete the workpiece clamping is as follows: First, the two ends of the pressure plate II 3 pass through the openings on the side of the workpiece and are inserted into the workpiece. The hydraulic oil enters the cylinder barrel 11 along the oil inlet of the cylinder barrel 11. As the amount of hydraulic oil in the cylinder barrel 11 increases, under the thrust of the hydraulic oil, the cylinder barrel 11 moves away from the plunger 12. While the cylinder barrel 11 moves, it drives the support plate 14 and the pull rod 8 to move away from the plunger 12. The movement of the support plate causes the compression spring 18 to be compressed. While the pull rod 8 drives the pressure plate I7 ​​to move, the pressure plate I7 ​​makes the A surface of the workpiece close to the positioning plate 5, thereby clamping and fixing the workpiece 4 at both ends of the pressure plate II 3 on the positioning plate 5, and processing the A' surface of the workpiece. After the processing is completed, under the elastic force of the compression spring 18, the support plate 14 drives the pull rod 8 to reset, and the workpiece can be removed from the tooling.

[0027] The third tooling group includes Figure 4 and Figure 5Several third fixtures are shown, which are arranged at intervals along the length direction of the base. The third fixture includes a single-acting piston cylinder 20, a pressure plate III 21 and a pull rod II 22. One end of the pull rod II 22 is connected to the single-acting piston cylinder 20, and the other end is connected to the pressure plate III 21. The single-acting piston cylinder 20 includes a cylinder barrel II 24, a piston rod 27, a piston 28 and a guide sleeve 30. The bottom of the cylinder barrel II 24 is fixed with a cylinder bottom cover 23, and the top of the cylinder barrel II 24 is fixed with a cylinder upper cover 32. The cylinder upper cover 32 is fixedly connected to a washer 35, thereby realizing the connection between the third fixture and the base. A piston 28 and a guide sleeve 30 are provided in the cylinder barrel Ⅱ 24. The piston 28 is connected to the bottom cover 23 of the oil cylinder by a compression spring 25. The piston rod 27 passes through the piston 28, the guide sleeve 30, the upper cover 32 of the oil cylinder and the washer 35 in sequence. One end of the piston rod 27 is fixedly connected to the piston 28 through a round nut 26, and the other end of the piston rod 27 extends out of the washer 35 and is fixedly connected to the bottom of the pull rod Ⅱ 22. When the piston 28 moves in the cylinder barrel Ⅱ 24, it drives the piston rod 27 and the pull rod Ⅱ 22 to move back and forth, and the guide sleeve 30 plays a guiding role during the movement. A pressure plate Ⅲ 21 is fixed on the top of the pull rod Ⅱ 22, and the pressure plate Ⅲ 21 is located above the workpiece 4. A sealing ring II 29 is provided between the outer surface of the piston 28 and the inner surface of the cylinder II 24, an O-ring 34 is provided between the outer surface of the guide sleeve 30 and the inner surface of the cylinder II 24, a sealing ring III 31 is provided between the inner surface of the guide sleeve 30 and the outer surface of the piston rod 27, and a dust ring II 33 is provided between the inner surface of the oil cylinder upper cover 32 and the piston rod 27. The structures of the fourth tooling group and the third tooling group are exactly the same, so they will not be described in detail.

[0028] The third tooling group completes the work process of clamping the workpiece as follows: place the workpiece 4 on the base, fix the pressure plate III 21 on the top of the pull rod II 22, and above the workpiece 4. The amount of oil in the cylinder II 24 can achieve that when the pressure plate III 21 is pressed tightly on the A surface of the workpiece, the locking of the single-acting piston cylinder is achieved through the hydraulic control one-way valve, and at the same time, the compression spring 25 between the piston 28 and the bottom cover 23 of the oil cylinder is compressed. At this time, the pressure plate III 21 makes the A' surface of the workpiece close to the base, thereby clamping and fixing the workpiece 4 on the base, and processing the B surface and B' surface of the workpiece. After the processing is completed, the hydraulic control one-way valve is closed, and the compression spring 25 applies an upward thrust to the piston 28, and hydraulic oil is injected into the cylinder II 24. As the amount of hydraulic oil in the cylinder II 24 continues to increase, the piston 28 is pushed upward under the thrust of the hydraulic oil, thereby driving the pull rod II 22 and the pressure plate III 21 to move upward, and the pressure plate III 21 is away from the workpiece, so that the workpiece can be removed. The clamping action of the fourth tooling group is the same as that of the third tooling group, except that the processed surface is different, so it will not be repeated.

[0029] The working process of the present invention is as follows: first, the A' surface of the workpiece 4 is clamped by the first tooling group 1 to realize the processing of the A surface of the workpiece, and the clamping and fixing of the workpiece is realized by the oil top; secondly, the A surface of the workpiece 4 is clamped by the second tooling group 2 to realize the processing of the A' surface of the workpiece, and the clamping and fixing of the workpiece is realized by the oil top; next, the A surface and the A' surface of the workpiece 4 can be vertically clamped by the third tooling group to realize the processing of the B surface and the B' surface of the workpiece, and the clamping and fixing of the workpiece can be realized by the single-acting piston cylinder; the A surface and the A' surface of the workpiece 4 can be vertically clamped by the fourth tooling group to realize the processing of the C surface and the C' surface of the workpiece, and the clamping and fixing of the workpiece can be realized by the single-acting piston cylinder. In the present invention, the first tooling group, the second tooling group, the third tooling group and the fourth tooling group work simultaneously, which improves the milling efficiency of the workpiece.

[0030] The double-sided milling machine hydraulic tooling provided by the present invention is introduced in detail above. The principle and implementation method of the present invention are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this article, but will conform to the widest range consistent with the principles and novel features disclosed in this article.

Claims

1. A double-sided milling machine hydraulic tooling, comprising a frame and a base, characterized in that: It also includes four tooling groups, including a first tooling group, a second tooling group, a third tooling group and a fourth tooling group, the first tooling group and the second tooling group are arranged on a frame, positioning plates are respectively fixed on both sides along the length direction of the frame, the first tooling group and the second tooling group are respectively arranged on two positioning plates, the first tooling group and the second tooling group are both arranged in the horizontal direction, and the third tooling group and the fourth tooling group are respectively arranged on the base and arranged in the vertical direction; The first tooling group includes a plurality of first toolings arranged at intervals along the positioning plate, the first tooling includes an oil top, a pull rod, a pressure plate I and a support plate, two support plates are symmetrically fixed on the outer side of the oil top, and pull rods are respectively arranged in the two support plates. The oil top includes a cylinder barrel, a plunger, a bottom plate, a support plate and a double-headed screw. An opening is arranged at the bottom of the cylinder barrel, and a cylinder cover I is fixed at the opening at the bottom of the cylinder barrel. The plunger is slidably arranged in the cylinder barrel through the opening at the bottom of the cylinder barrel, the bottom of the plunger is fixedly connected to one side of the bottom plate, and the other side of the corresponding bottom plate is fixedly connected to the inner side of the positioning plate, the outer side of the cylinder barrel is symmetrical Two support plates are fixed, and the support plates are arranged in parallel with the bottom plate. The support plates and the bottom plate are connected by a double-headed screw, one end of the double-headed screw is fixedly connected to the bottom plate by a threaded connection, and the other end of the double-headed screw passes through and extends out of the support plate, and a nut is fixed to the end, and a compression spring is arranged between the nut and the support plate. The pull rod passes through the support plate and the positioning plate in sequence, and one end of the pull rod extends into the workpiece outside the positioning plate, and a pressure plate I is fixed to the end of the pull rod extending into the workpiece, and a nut is fixed to the other end of the pull rod, and the nut is located on the inner side of the support plate, and the support plate reciprocates along the axial direction of the double-headed screw; The second tooling group includes a second tooling set in an array along the positioning plate at intervals, the second tooling includes two oil tops, a pull rod, a pressure plate II and a support plate, the two oil tops are fixedly connected by a support plate, the outer sides of the two oil tops are respectively fixed with support plates, a pull rod is arranged in the support plate connecting the two oil tops, the cylinder barrels of the two oil tops are fixedly connected by a support plate, the outer sides of the two cylinder barrels are respectively fixed with support plates, a pull rod is arranged in the support plate connecting the two cylinder barrels, one end of the pull rod passes through the support plate and the positioning plate in sequence, and is located on the outer side of the positioning plate, one end of the pull rod is fixed with a pressure plate II, the other end of the pull rod is fixed with a nut, the nut is located on the inner side of the support plate, and the two support plates on the outer sides of the two cylinder barrels are connected to the bottom plate by double-headed screws respectively; The third tooling group includes several third toolings arranged at intervals along the length direction of the base, the third tooling includes a single-acting piston cylinder, a pressure plate III and a pull rod II, one end of the pull rod II is connected to the single-acting piston cylinder, and the other end is connected to the pressure plate III, the single-acting piston cylinder includes a cylinder barrel II, a piston rod, a piston and a guide sleeve, a cylinder bottom cover is fixed to the bottom of the cylinder barrel II, a cylinder upper cover is fixed to the top of the cylinder barrel II, the cylinder upper cover is fixedly connected to the washer, a piston and a guide sleeve are arranged in the cylinder barrel II, the piston and the cylinder bottom cover are connected by a compression spring, the piston rod passes through the piston, the guide sleeve, the cylinder upper cover and the washer in sequence, one end of the piston rod is fixedly connected to the piston, the other end of the piston rod extends out of the washer and is fixedly connected to the bottom of the pull rod II, a pressure plate III is fixed to the top of the pull rod II, and the pressure plate III is located above the workpiece; A sealing ring I is provided between the inner surface of the bottom of the cylinder and the outer surface of the plunger, and a dust ring I is provided between the inner surface of the cylinder cover I and the outer surface of the plunger; A sealing ring II is provided between the outer surface of the piston and the inner surface of the cylinder II, an O-ring is provided between the outer surface of the guide sleeve and the inner surface of the cylinder II, a sealing ring III is provided between the inner surface of the guide sleeve and the outer surface of the piston rod, and a dust ring II is provided between the inner surface of the cylinder cover and the piston rod.

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