WO2016029695A1 - Unpowered cavity push-puller and clamper used thereby - Google Patents

Abstract

An unpowered cavity push-puller and clamper used thereby, employing a lower cavity of an oil tank body (6) to hold oil to seal a nitrogen spring (8), thus effectively solving the problem of sealing the nitrogen spring (8) under a high temperature and a high pressure, and having a simple and reasonable structure design, a low manufacturing cost and stable control of the nitrogen spring (8) and of temperature change; and in addition, the lubrication function of lower cavity oil enables the nitrogen spring (8) to have good lubricity with a cavity oil tank piston (1) and the oil tank body (6). The unpowered cavity push-puller configured to seal the nitrogen spring (8) under high pressure provides a constant power to realize a push-pull function without an additional external power source, and maintains a pressure when clamping a machined component without leakage, thus having a high stability, saving energy and being non-polluting.

Description

Unpowered cavity pusher and its application clamp Technical field

The present invention relates to the field of clamp components, and more particularly to a non-powered cavity pusher and a clamp for the same.

Background technique

With the continuous advancement of science and technology, the requirements of the clamps in the industrial field are getting higher and higher, requiring the clamp to meet various requirements of the mechanical structure, and requiring miniaturization and high performance of the clamp components. Conventional clamp elements used in the prior art, such as single-acting clamps (hydraulic or pneumatic clamping, spring force release), double acting clamps (hydraulic or pneumatic clamping, spring force release) and hydraulic Loosen the spring clamping, etc. At present, the clamps used in various industries around the world are mainly pneumatic and hydraulic. The clamping force of the air clamp is small, the hydraulic clamp needs to continuously replenish power during operation, waste energy, and the spring clamp is clamped by the spring force. The spring force generated by the spring clamp increases in proportion to the amount of compression and cannot maintain a constant pressure during operation, and the telescopic stroke is small, and many processes require a constant clamping force. Conventional clamp components have a very large impact on the process design requirements. In particular, the pressure-holding clamps require extremely high pressure-holding functions for the clamps. Ordinary clamps cannot meet the process requirements, resulting in a direct impact on the product. Quality and efficiency have led to a significant increase in production costs. If you can develop a device that does not require an external power source, but can provide a constant power to achieve the push-pull function, the above problem can be solved; if a high-pressure sealed nitrogen gas spring can be developed, it can be designed to meet the above requirements. The required device to implement the push-pull function.

Nitrogen is an inert gas, non-toxic, non-corrosive, non-combustible, safe and reliable, but the density of nitrogen is very small, the internal pressure of the nitrogen gas spring increases, the seal pressure of the sealed nitrogen seal increases, and the pressure difference between the external atmospheric pressure increases. Large, nitrogen sealing under high temperature and high pressure is a very difficult key technology The technical problem is high, the manufacturing cost is high, the control of the nitrogen system is also very unstable, and the control problem of temperature change is also difficult to solve, and at the same time, the lubrication performance decreases with high speed movement. These technical problems have plagued technology developers in the art.

Summary of the invention

The technical problem to be solved by the present invention is to provide a non-powered cavity push-pull device and a clamp thereof for solving the problems of pressure variation, leakage, instability and waste of energy during clamping; no additional external power source is required by itself However, it can provide the problem of constant power to achieve the push-pull function; the high-pressure sealed nitrogen gas spring works without additional external power source, sealing under high temperature and high pressure, stability control, lubrication, energy saving and cost reduction.

In order to solve the above technical problem, the technical solution of the present invention is: a non-powered cavity pusher, comprising a cavity cylinder piston, a cylinder block, a nitrogen gas spring and a cylinder end cover, wherein a bottom end cavity of the cylinder block is equipped with a cylinder end cover and The cylinder block and the cylinder end cover are sealed by an O-ring; the inner cavity of the cylinder block is movably mounted with a cavity cylinder piston, and the cavity cylinder piston includes an upper piston rod, a large end portion and a lower piston which are sequentially connected into an integral structure. The rod, the upper piston rod and the inner cavity of the cylinder block are sealed by an oil seal, and the large end portion and the inner cavity of the cylinder block are sealed by an oil seal, and the lower piston rod and the inner cavity of the cylinder end cover are sealed by an oil seal. a sealing; an upper chamber is formed between the upper end surface of the large end portion and the inner cavity of the cylinder block; a lower chamber is formed between the lower surface of the large end portion and the cylinder end cover; and an upper chamber is provided at an upper portion of the cylinder block In the oil passage, a plug is installed at the oil port of the upper chamber, a lower chamber oil passage is arranged in the oil cylinder end cover, and a plug is installed at the oil port of the lower chamber; the upper surface of the oil cylinder end cover surrounds the lower piston The rod is placed with a plurality of gas springs; The nitrogen gas spring comprises a nitrogen gas cavity cavity piston, a nitrogen gas spring cylinder body and a nitrogen gas spring end cover. The bottom inner cavity of the nitrogen gas spring cylinder body is provided with a nitrogen gas spring end cover and the inner cavity of the nitrogen gas spring cylinder body and the nitrogen gas spring end cover pass through O. The ring seal, the inside of the gas spring end cover is installed with a one-way inflation valve assembly, the inner chamber of the gas spring cylinder is movably mounted with a nitrogen spring cavity piston, and the gas spring cavity piston extends over the top of the nitrogen gas cylinder and nitrogen The gas spring cavity piston is sealed with the nitrogen gas spring cylinder, and the inner cavity of the gas spring cylinder is filled with nitrogen gas.

A dust seal is disposed between the upper piston rod and the top inner cavity of the cylinder block.

A dust seal is disposed between the lower piston rod and the bottom inner cavity of the cylinder end cover.

The gas spring cavity piston and the nitrogen gas spring cylinder are sealed by two Y-rings arranged one above the other.

A push clamp for applying a non-powered cavity pusher, comprising a non-powered cavity pusher, a fixed plate, a spherical top pin, a horizontal table and a vertical table, and the upper surface of the horizontal table is vertically fixed The lower part of the cylinder block is inserted into the middle hole of the fixing plate and fixed on the fixing plate by a nut. The axial direction of the cavity cylinder piston is parallel to the horizontal worktable, and the top end of the upper piston rod is installed with a spherical top pin; horizontal working A vertical table is mounted on the upper surface of the table and the vertical table is located on the opposite side of the spherical pin.

A tension clamp for applying a non-powered cavity pusher, comprising an unpowered cavity pusher, a fixed plate, a horizontal table, a pressing arm, a screw and a spring, and the upper surface of the horizontal table is vertically fixed a plate, a lower portion of the cylinder block is inserted into the middle hole of the fixing plate and fixed to the fixing plate by a nut, and the axis direction of the cavity cylinder piston is parallel to the horizontal table; the screw is inserted into the cavity of the cavity cylinder piston and The nut 3 is fixed to the cavity cylinder piston through the nut 3 at the two ends of the cavity cylinder piston; the side end of the nut 3 located at the end of the lower piston rod is sequentially provided with a spring, a pressing arm and a nut 2.

A gasket is arranged between the pressing arm and the nut 2.

The spring is provided with a gasket at both ends.

The invention adopts the oil in the lower chamber of the cylinder block to seal the structure of the nitrogen gas spring, effectively solves the sealing problem of the nitrogen spring under high temperature and high pressure, has simple and reasonable structural design, low manufacturing cost, stable control of the nitrogen gas spring, and stable temperature change control. At the same time, due to the lubrication function of the lower chamber oil, the nitrogen gas spring itself and the cavity cylinder piston and the cylinder block have good lubricity; The unpowered cavity push-pull device designed by the spring does not need an external power source itself, but can provide a constant power to realize the push-pull function; the non-powered cavity push-puller can realize the pressure-holding clamping of the workpiece to be processed. No leakage, high stability, energy saving and no pollution.

DRAWINGS

Figure 1 is a schematic view of the structure of the unpowered cavity pusher;

Figure 2 is a schematic view of the structure of the unpowered cavity pusher;

Figure 3 is an A-A arrow view of the unpowered cavity pusher;

Figure 4 is a schematic view showing the structure of a nitrogen gas spring;

Figure 5 is a schematic structural view of a push-type clamp applying a non-powered cavity push-pull device;

Figure 6 is a schematic view showing the structure of a tension clamp using a non-powered cavity pusher.

Among them: 1. Cavity cylinder piston, 2. Dust ring, 3. Upper chamber oil passage, 4. Plug, 5. Oil seal one, 6. Cylinder block, 7. Oil seal two, 8. Nitrogen spring, 9 Cylinder end cap, 10. lower chamber oil passage, 11.O-ring, 12. nitrogen spring cavity piston, 13. nitrogen spring cylinder, 14.Y-ring, 15. one-way inflation valve assembly, 16. Nitrogen gas end cap, 17. cutter head, 18. fixed plate, 19. spherical top pin, 20. nut one, 21. horizontal table, 22. vertical table, 23. machined parts, 24. compression arm, 25. Screw, 26. Nut 2, 27. Gasket, 28. Spring, 29. Nut 3.

detailed description

Embodiment 1

As shown in FIG. 1 to FIG. 4, the unpowered cavity pusher includes a cavity cylinder piston 1, a cylinder block 6, a nitrogen gas spring 8, and a cylinder end cover 9. The bottom end cavity of the cylinder block 6 is provided with a cylinder end cover. 9 and the cylinder block 6 and the cylinder end cover 9 are sealed by the O-ring 11; the inner cavity of the cylinder block 6 is movably mounted with the cavity cylinder piston 1, and the cavity cylinder piston 1 includes an upper piston which is sequentially connected into an integral structure. Rod, big end a portion and a lower piston rod, the upper piston rod and the inner cavity of the cylinder block 6 are sealed by an oil seal 5, and a dust seal 2 is disposed between the upper piston rod and the top inner cavity of the cylinder block 6, the large end portion is The inner cavity of the cylinder block 6 is sealed by the oil seal 2, and the lower piston rod and the inner cavity of the cylinder end cover 9 are sealed by the oil seal 5, and the lower piston rod is disposed between the bottom inner cavity of the cylinder end cover 9. a dustproof ring 2; an upper chamber is formed between the upper surface of the large end portion and the inner cavity of the cylinder block 6, and a lower chamber is formed between the lower surface of the large end portion and the cylinder end cover 9; the upper portion of the cylinder block 6 The upper chamber oil passage 3 is provided, and the plug 4 is installed at the oil port of the upper chamber, the lower chamber oil passage 10 is disposed in the cylinder end cover 9, and the plug 4 is installed at the oil port of the lower chamber; the oil cylinder A plurality of gas springs 8 are placed on the upper surface of the end cap 9 and around the lower piston rod; the nitrogen gas spring 8 includes a nitrogen gas spring cavity piston 12, a nitrogen gas spring cylinder 13 and a nitrogen gas spring end cap 16, the bottom of the nitrogen gas spring cylinder 13 The inner chamber is fitted with a gas spring end cap 16 and the inner cavity of the nitrogen gas spring cylinder 13 and the gas spring end cap 16 are sealed by an O-ring 11 The inside of the nitrogen gas spring end cover 16 is mounted with a one-way inflation valve assembly 15, and the inner cavity of the nitrogen gas spring cylinder 13 is movably mounted with a nitrogen gas spring cavity piston 12, and the nitrogen gas spring cavity piston 12 extends over the top of the nitrogen gas spring cylinder block 13 and The gas spring cavity piston 12 and the nitrogen gas spring cylinder 13 are sealed by two Y-rings 14 arranged one above the other, the inner cavity of the gas spring cylinder 13 is filled with nitrogen gas, and the upper Y-ring 14 is used for sealing the oil. The lower Y-ring 14 is used to seal the nitrogen gas; during operation, the hydraulic oil is supplied to the upper chamber through the upper chamber oil passage 3, so that the cavity cylinder piston 1 is subjected to the downward thrust to move downward, and the nitrogen gas spring 8 is compressed to the maximum. During the stroke, the cavity cylinder piston 1 cannot continue to move downward; the hydraulic oil returns to the oil through the upper chamber oil passage 3, and the cavity cylinder piston 1 is moved upward by the extension force of the nitrogen gas spring 8, and the gas spring 8 is extended to the maximum stroke, empty The cavity cylinder piston 1 cannot continue to move upward; the invention can be widely applied to any device that requires push-pull power, and does not require an external power source itself.

Embodiment 2

As shown in Figures 1 to 5, a push-type clamp using a non-powered cavity pusher includes no motion Force cavity pusher, fixed plate 18, spherical top pin 19, horizontal table 21 and vertical table 22, unpowered cavity pusher, including cavity cylinder piston 1, cylinder block 6, nitrogen spring 8 and cylinder end The cover 9, the bottom inner cavity of the cylinder block 6 is mounted with a cylinder end cover 9 and the cylinder block 6 and the cylinder end cover 9 are sealed by an O-ring 11; the inner cavity of the cylinder block 6 is movably mounted with a cavity cylinder piston 1. The cavity cylinder piston 1 comprises an upper piston rod, a large end portion and a lower piston rod which are sequentially connected in an integrated structure, and the upper piston rod and the inner cavity of the cylinder block 6 are sealed by an oil seal 5, the upper piston rod and the oil cylinder A dust seal 2 is disposed between the top inner cavity of the cylinder block 6, and the large end portion is sealed with the inner cavity of the cylinder block 6 by an oil seal 2, and an oil seal is passed between the lower piston rod and the inner cavity of the cylinder end cover 9. a 5 seal, a dust ring 2 is disposed between the lower piston rod and the bottom inner cavity of the cylinder end cover 9; the upper surface of the large end portion and the inner cavity of the cylinder block 6 form an upper chamber, and the large end portion The lower surface forms a lower chamber with the cylinder end cover 9; the upper portion of the cylinder block 6 is provided with an upper chamber oil passage 3, A plug 4 is installed at the oil port of the chamber, a lower chamber oil passage 10 is disposed in the cylinder end cover 9, and a plug 4 is installed at the oil port of the lower chamber; the upper surface of the cylinder end cover 9 surrounds the lower piston The rod is provided with a plurality of nitrogen gas springs 8; the nitrogen gas spring 8 includes a nitrogen gas spring cavity piston 12, a nitrogen gas spring cylinder block 13, and a nitrogen gas spring end cap 16, and the bottom inner cavity of the nitrogen gas spring cylinder block 13 is fitted with a nitrogen gas spring end cap 16 and nitrogen gas. The inner cavity of the spring cylinder 13 and the gas spring end cover 16 are sealed by an O-ring 11 , and the inside of the gas spring end cover 16 is mounted with a one-way inflation valve assembly 15 , and the inner cavity of the gas spring cylinder 13 is movably mounted with nitrogen gas. The spring cavity piston 12, the nitrogen gas cavity cavity piston 12 protrudes from the top of the nitrogen gas spring cylinder block 13, and the nitrogen gas spring cavity piston 12 and the nitrogen gas spring cylinder block 13 are sealed by two Y-rings 14 arranged above and below, nitrogen gas The inner cavity of the spring cylinder 13 is filled with nitrogen gas, the upper Y-ring 14 is used to seal the oil, and the lower Y-ring 14 is used to seal the nitrogen; the upper surface of the horizontal table 21 is vertically mounted with the fixing plate 18, the cylinder block The lower portion of the 6 is inserted into the middle hole of the fixing plate 18 and is fixed by the nut 20 The fixed plate 18, a cavity direction and the horizontal cylinder piston axis 21 parallel to the table 1, the upper portion of the piston rod attached to the spherical tip ejector pin 19; the horizontal table 21 mounted on a vertical surface perpendicular to the work table 22, and The working table 22 is located on the opposite side of the spherical top pin 19; in operation, after the processed part 23 is positioned by the horizontal table 21 and the vertical table 22, the hydraulic oil is returned to the oil through the upper chamber oil passage 3, and the cavity cylinder piston 1 The moving force of the gas spring 8 is moved toward the workpiece 23, the spherical pin 19 pushes the workpiece 23, and the cutter head 17 can process the workpiece 23. After the machining is completed, the hydraulic oil is supplied through the upper chamber oil passage 3. The upper chamber is inserted to move the cavity cylinder piston 1 in the direction of the reversely machined part 23, thereby releasing the workpiece 23.

The invention is particularly suitable for automated production, such as clamping of a workpiece in a line, clamping of a workpiece by a fixture, clamping of a workpiece by a pressure holding fixture, and clamping. Throughout the development process, several performance tests and reliability tests have been passed, solving a major problem that has long plagued researchers in this field.

Embodiment 3

As shown in FIG. 1 to FIG. 4 and FIG. 6, a tension clamp using an unpowered cavity pusher includes an unpowered cavity pusher, a fixed plate 18, a horizontal table 21, and a pinch arm 24 , the screw 25 and the spring 28, the unpowered cavity pusher, including the cavity cylinder piston 1, the cylinder block 6, the nitrogen gas spring 8 and the cylinder end cover 9, the bottom inner cavity of the cylinder block 6 is provided with the cylinder end cover 9 and The cylinder block 6 and the cylinder end cover 9 are sealed by an O-ring 11; the inner cavity of the cylinder block 6 is movably mounted with a cavity cylinder piston 1, and the cavity cylinder piston 1 includes an upper piston rod which is sequentially connected into an integral structure, The large end portion and the lower piston rod, the upper piston rod and the inner cavity of the cylinder block 6 are sealed by an oil seal 5, and the upper piston rod and the top inner cavity of the cylinder block 6 are provided with a dust seal 2, the big end The portion is sealed with the inner cavity of the cylinder block 6 by the oil seal 2, and the lower piston rod and the inner cavity of the cylinder end cover 9 are sealed by the oil seal 5, and between the lower piston rod and the bottom inner cavity of the cylinder end cover 9. A dust seal 2 is provided; an upper chamber is formed between the upper end surface of the large end portion and the inner cavity of the cylinder block 6, and the large end portion is Configuration between the surface of the cylinder end 9 of the lower chamber; an upper portion of the cylinder block 6 is provided on the oil passage chamber 3, the oil port of the upper chamber 4 is mounted plug, cylinder end 9 There is a lower chamber oil passage 10, and a plug 4 is installed at the oil port of the lower chamber; a plurality of gas springs 8 are placed on the upper surface of the cylinder end cover 9 and around the lower piston rod; the gas spring 8 includes a nitrogen gas spring The cavity piston 12, the nitrogen gas spring cylinder 13 and the nitrogen gas spring end cover 16, the bottom inner cavity of the nitrogen gas spring cylinder 13 is fitted with a nitrogen gas spring end cover 16 and between the inner cavity of the nitrogen gas spring cylinder 13 and the gas spring end cover 16 Sealed by the O-ring 11 , the inside of the nitrogen gas spring end cover 16 is mounted with a one-way inflation valve assembly 15 . The inner cavity of the nitrogen gas spring cylinder 13 is movably mounted with a nitrogen gas cavity cavity piston 12 , and the nitrogen gas spring cavity piston 12 is extended with nitrogen gas. The top of the spring cylinder 13 and the nitrogen gas spring cavity piston 12 and the nitrogen gas spring cylinder 13 are sealed by two Y-rings 14 arranged one above the other. The inner cavity of the gas spring cylinder 13 is filled with nitrogen gas, and the upper Y type The ring 14 is used to seal the oil, and the lower Y-ring 14 is used to seal the nitrogen; the upper surface of the horizontal table 21 is vertically mounted with a fixing plate 18, and the lower portion of the cylinder block 6 is inserted into the middle hole of the fixing plate 18 and passed through the nut 20 fixed to the fixed plate 18, the axis of the cavity cylinder piston 1 The direction is parallel to the horizontal table 21; the screw 25 is inserted into the cavity of the cavity cylinder piston 1 and fixed to the cavity cylinder piston 1 by a nut 39 located at both ends of the cavity cylinder piston 1; at the end of the lower piston rod The side end of the nut 39 is in turn provided with a spring 28, a pressing arm 24, a nut 26, a spacer 27 is provided between the pressing arm 24 and the nut 26, and a spacer 27 is provided at both ends of the spring 28; During operation, the hydraulic oil is returned to the oil through the upper chamber oil passage 3, and the cavity cylinder piston 1 is driven by the extension force of the nitrogen gas spring 8 to drive the screw 25 and the pressing arm 24 to tighten the workpiece 23, and the cutter head 17 can process the machined part. After the processing is completed, the hydraulic oil is supplied into the upper chamber through the upper chamber oil passage 3, so that the cavity cylinder piston 1 is subjected to the reverse thrust movement, thereby releasing the workpiece 23 to be processed.

The invention is particularly suitable for automated production, such as clamping of a workpiece in a line, clamping of a workpiece by a fixture, clamping of a workpiece by a pressure holding fixture, and clamping. Throughout the development process, several performance tests and reliability tests have been passed, solving a major problem that has long plagued researchers in this field.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art within the technical scope disclosed by the present invention It is to be understood that the invention and the equivalents thereof are included in the scope of the present invention.

Claims (8)

The non-powered cavity pusher is characterized in that it comprises a cavity cylinder piston (1), a cylinder block (6), a nitrogen gas spring (8) and a cylinder end cover (9), and a bottom cavity of the cylinder block (6). The cylinder end cover (9) is installed and the cylinder block (6) and the cylinder end cover (9) are sealed by an O-ring (11); The inner cavity of the cylinder block (6) is movably mounted with a cavity cylinder piston (1), and the cavity cylinder piston (1) includes an upper piston rod, a large end portion and a lower piston rod, which are sequentially connected in an integral structure, and an upper piston rod and The inner cavity of the cylinder block (6) is sealed by an oil seal (5), and the large end portion is sealed with the inner cavity of the cylinder block (6) by an oil seal two (7), and the lower piston rod and the cylinder end cover ( 9) The inner cavity is sealed by an oil seal (5); An upper chamber is formed between the upper surface of the large end portion and the inner cavity of the cylinder block (6), and a lower chamber is formed between the lower surface of the large end portion and the cylinder end cover (9); The upper part of the cylinder block (6) is provided with an upper chamber oil passage (3), a plug (4) is installed at the oil port of the upper chamber, and a lower chamber oil passage is provided in the cylinder end cover (9) (10) ), a plug (4) is installed at the port of the lower chamber; a plurality of gas springs (8) placed on the upper surface of the cylinder end cap (9) and around the lower piston rod; The nitrogen gas spring (8) includes a nitrogen spring cavity piston (12), a nitrogen gas spring cylinder (13), and a nitrogen gas spring end cover (16). The bottom inner cavity of the nitrogen gas spring cylinder (13) is fitted with a nitrogen gas spring end cover (16). And the inner chamber of the nitrogen gas spring cylinder (13) and the nitrogen gas spring end cover (16) are sealed by an O-ring (11), and the gas spring end cover (16) is internally provided with a one-way inflation valve assembly (15) The inner chamber of the nitrogen gas spring cylinder (13) is movably mounted with a nitrogen spring cavity piston (12), and the gas spring cavity piston (12) extends over the top of the nitrogen gas spring cylinder (13) and the nitrogen spring cavity piston (12) ) sealed with a nitrogen gas spring cylinder (13), the inner chamber of the gas spring cylinder (13) is filled with nitrogen. The unpowered cavity pusher according to claim 1, characterized in that the upper piston rod and the top inner cavity of the cylinder block (6) are provided with a dust seal (2). The unpowered cavity pusher of claim 1 wherein said lower piston A dust seal (2) is provided between the rod and the bottom inner cavity of the cylinder end cover (9). The unpowered cavity push-pull device according to claim 1, wherein said nitrogen gas spring cavity piston (12) and said nitrogen gas spring cylinder block (13) pass through two Y-shaped rings arranged one above another ( 14) Sealed. A push clamp for applying the unpowered cavity pusher according to claim 1, comprising: an unpowered cavity pusher, a fixing plate (18), a spherical top pin (19), horizontal working a table (21) and a vertical table (22), the upper surface of the horizontal table (21) is vertically mounted with a fixing plate (18), and a lower portion of the cylinder block (6) is inserted into the middle hole of the fixing plate (18) and passes through The nut one (20) is fixed on the fixing plate (18), the axial direction of the cavity cylinder piston (1) is parallel to the horizontal working table (21), and the top end of the upper piston rod is mounted with a spherical top pin (19); The upper surface of the horizontal table (21) is mounted with a vertical table (22) and the vertical table (22) is located on the opposite side of the spherical pin (19). A tension clamp for applying the unpowered cavity pusher according to claim 1, comprising: an unpowered cavity pusher, a fixing plate (18), a horizontal table (21), and a pressing The arm (24), the screw (25) and the spring (28), the upper surface of the horizontal table (21) is vertically mounted with a fixing plate (18), and the lower portion of the cylinder block (6) is inserted into the middle hole of the fixing plate (18). And fixed to the fixing plate (18) by a nut (20), the axial direction of the cavity cylinder piston (1) is parallel to the horizontal table (21); The screw (25) is inserted into the cavity of the cavity cylinder piston (1) and fixed to the cavity cylinder piston (1) by a nut three (29) located at both ends of the cavity cylinder piston (1); The side ends of the nut three (29) of the end are sequentially provided with a spring (28), a pressing arm (24), and a nut two (26). The tensioning clamp according to claim 6, characterized in that a spacer (27) is provided between the pressing arm (24) and the nut (26). A tension clamp according to claim 6 wherein two of said springs (28) The ends are provided with gaskets (27).

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