Ultrahigh-pressure hydraulic riveting tool

Abstract

The ultrahigh-pressure hydraulic riveting tool comprises a riveting clamping jaw and a riveting anvil which are driven by a hydraulic oil cylinder, and an oil cylinder body is composed of an outer-layer alloy cylinder body and an inner-layer alloy cylinder body; the inner-layer alloy cylinder body and the outer-layer alloy cylinder body are combined through interference nesting to form an oil cylinder body barrel of an integrated structure; in the interference joint surfaces of the inner-layer alloy cylinder body and the outer-layer alloy cylinder body, the side wall joint surface is of a linear cylinder joint surface structure, the front end joint surface is of a plane annular joint surface structure arranged in the radial direction, and an arc ring transition joint surface structure is arranged between the side wall joint surface and the front end joint surface. The double-layer cylinder body nesting combination mode is adopted for the first time, and the stress distribution of the cylinder body in a high-pressure state is more uniform due to prestress generated by extrusion and diameter expansion in the nesting combination process; the alloy material cylinder body has good forming performance, can be processed in multiple modes such as hot processing and liquid nitrogen cold processing, has high thermoplasticity and low plastic strain hardening index, and can effectively avoid fracture of the cylinder body.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting and fastening machinery design, in particular to the technical field of design and production of hydraulic riveting tools, and specifically relates to an ultra-high pressure hydraulic riveting tool. Background Art

[0002] The application of ring groove rivets solves the inertia problems of loosening and falling off of high bolt connections under complex wind conditions. Most of the existing key parts of wind turbine towers and nacelles are large-sized ring groove rivets of 30mm and above, which require riveting tools to output super-large tensile forces and their cylinders to withstand super-high pressures. In order to ensure the strength of the tools, the existing technology blindly increases the wall thickness of the cylinder, resulting in the heavy weight of this type of tool, generally greater than 40kg, which is difficult to transport and has poor human-machine interaction during work. In addition, the installation of wind turbine ring groove rivets is an aerial operation, which puts higher requirements on the portability and safety of riveting tools.

[0003] The core component of the ultra-high pressure riveting tool, the oil cylinder, is composed of a double-layer titanium alloy composite nest. The titanium alloy material provides high strength, good corrosion resistance, and excellent heat resistance. At the same time, due to its low density, it can achieve lightweight riveting tools. The double-layer composite structure is assembled by interference fit. During the composite process, the expansion and extrusion of the inner lining titanium alloy will cause residual stress in the base metal. During the riveting work, this stress will offset part of the internal pressure, thereby improving the overall bearing capacity of the cylinder body. The double-layer composite structure is conducive to improving the radial force of the cylinder body and improving material utilization. Summary of the invention

[0004] The present invention discloses an ultra-high pressure hydraulic riveting tool based on the shortcomings of the prior art. The purpose of the present invention is to provide an ultra-high pressure lightweight riveting tool for large-sized ring groove rivets for wind power. The present invention can be used for disassembly of ring groove rivets, installation and flattening of large-sized bolts.

[0005] The present invention is achieved through the following technical solutions:

[0006] A super-high-pressure hydraulic riveting tool comprises riveting claws and a riveting anvil driven by a hydraulic cylinder, and is characterized in that: the cylinder body is composed of an outer alloy cylinder body and an inner alloy cylinder body; the outer alloy cylinder body and the inner alloy cylinder body are combined by interference nesting to form an integrated cylinder body tube; in the interference joint surface between the outer alloy cylinder body and the inner alloy cylinder body, the side wall joint surface is a straight cylindrical joint surface structure, the front end joint surface is a radially arranged planar annular joint surface structure, and the side wall joint surface and the front end joint surface are between The arc ring transition joint surface structure.

[0007] The oil cylinder is further composed of an outer alloy cylinder body, an inner alloy cylinder body, a front end sealing ring, a piston base, a piston spindle, a rear end cover, a cylinder head retaining ring, a rear baffle and front and rear retaining rings.

[0008] Furthermore, the front end sealing ring is assembled at the front end of the cylinder body, the inner end is connected to the cylinder body through a step, and the outer end is fixed by a front retaining ring; a dust ring is arranged on the front side of the joint between the front end sealing ring and the piston main shaft, a front end dynamic seal is arranged on the rear side, and a front end static seal is arranged at the joint between the front end sealing ring and the cylinder body.

[0009] Furthermore, the rear end cover is fixed by a cylinder head retaining ring, the cylinder head retaining ring is connected to the inner alloy cylinder body by a thread, a rear baffle is arranged at the end of the cylinder head retaining ring thread, and the rear baffle is fixed by the rear retaining ring; an end cover static seal is arranged at the joint of the rear end cover and the inner alloy cylinder body, and a mounting seat static seal is arranged at the joint of the rear end cover and the claw mounting seat.

[0010] Furthermore, a threaded hole is arranged at the center of the piston base, which is connected to the piston spindle through a thread; a relief hole is arranged at the piston base, and together with the relief rod, a hydraulic riveting tool unloading device is formed; a base static seal is arranged at the front end of the joint between the piston base and the piston spindle, and a base dynamic seal is arranged at the joint between the piston base and the inner alloy cylinder body; and a spindle dynamic seal is arranged at the joint between the piston spindle and the claw mounting seat.

[0011] Furthermore, the piston spindle seal is a sealing structure of supporting ring + lip seal ring + supporting ring + dustproof seal ring; the piston base seal is a sealing structure of lip seal ring + supporting ring + lip seal ring.

[0012] Furthermore, the riveted anvil is threadedly connected to the anvil connecting seat, and the anvil connecting seat is threadedly connected to the piston spindle.

[0013] Furthermore, the riveting claw is threadedly connected to the claw mounting seat, and the claw mounting seat is threadedly connected to the rear end cover.

[0014] Furthermore, the static seal is a sealing structure of an O-ring + a retaining ring, and the static seal or the dynamic seal includes a lip seal ring and adopts a back-to-back installation structure.

[0015] Further, the outer alloy cylinder body is a cylinder body made of aluminum alloy, alloy steel or titanium alloy; the inner alloy cylinder body is a cylinder body made of aluminum alloy, alloy steel or titanium alloy; the outer alloy cylinder body and the inner alloy cylinder body are made of the same or different materials. In the present invention, both the outer alloy cylinder body and the inner alloy cylinder body are made of titanium alloy cylinder body.

[0016] The cylinder body of the lightweight double-layer composite ultra-high pressure hydraulic riveting tool of the present invention is composed of two layers of titanium alloy cylinder bodies nested in each other. The oil cylinder is composed of an outer alloy cylinder body, an inner alloy cylinder body, a front sealing ring, a piston base, a piston spindle, a rear end cover, a cylinder head retaining ring, a rear baffle, and front and rear retaining rings. The inner and outer cylinder bodies are nested and combined according to the required interference amount calculated. This structure is beneficial to optimizing the stress distribution of the cylinder body under high pressure. The present invention designs the stress values ​​of the outer wall of the inner cylinder body and the inner wall of the outer cylinder body to be close, so that the material is utilized to the maximum extent and the material utilization rate is improved. Titanium alloy material has the material characteristics of high strength, low density and high wear resistance. The application of this material in the design of hydraulic cylinder body is beneficial to increasing the pressure bearing capacity of the cylinder body and reducing the weight of the whole machine.

[0017] The present invention further designs a sealing structure based on the characteristics of ultra-high pressure riveting. The sealing structure of the lightweight double-layer composite ultra-high pressure hydraulic riveting tool is mainly concentrated in the piston spindle and the piston base, where the piston spindle sealing system is a support ring + lip seal + support ring + dustproof seal, and the piston base sealing system is a lip seal + support ring + lip seal. All static sealing systems are in the form of O-ring + retaining ring, and the lip seal in the sealing system is installed back to back.

[0018] The riveting tool oil circuit block of the present invention mainly includes an oil inlet channel, an oil return channel, a process plug, an oil port combination seal, an oil inlet pipe and an oil return pipe. The oil channel design is based on the piston movement speed and the feasibility of the titanium alloy material processing technology. In order to ensure the consistency of the overall appearance, the process plug is welded and sealed, then milled flat and surface treated. The main function of the oil inlet pipe and the oil return pipe is to connect the hydraulic power source, and they have the characteristics of high pressure resistance and safety. The connection between them and the cylinder body is sealed by a combined sealing gasket.

[0019] The gripping end of the riveting tool handle of the present invention is cast from high-strength materials and has an ergonomic structural design, providing a comfortable gripping environment for the user. The handle is slotted inside for installing a riveting gun control button and a control signal line.

[0020] The lightweight double-layer composite ultra-high pressure hydraulic riveting tool of the present invention is mainly used for the installation of large-size ring groove rivets for wind power, and its riveting gun head assembly includes riveting claws, riveting anvils, claw connecting seats, and anvil connecting seats. After heat treatment, the riveting claws use the toughness of the material and are driven by the tooling to open into a three-petal shape. During the working process, it mainly clamps the tail teeth of the ring groove rivet to provide a bearing point for riveting. The riveting anvil is designed with a special internal arc surface, which can be divided into a bell mouth section, a forming section, and a release section, wherein the bell mouth section is a riveting transition port, and the bell mouth design is conducive to the initial contact forming of the riveting anvil and the flange ring. The size design of the forming section is related to the performance parameters such as the pull-off force and shear force of the ring groove rivet, and the release section is used for the volume release process after the cold forming of the flange ring. The riveting anvil and the riveting claws are made of two special materials respectively, and the riveting gun head adopts a segmented structural design, that is, the claws and anvil connecting seats made of ordinary steel are introduced respectively to reduce costs. The riveting claw and the claw connecting seat, the riveting anvil and the anvil connecting seat are connected through threads.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The riveting tool of the present invention improves stress distribution. The working pressure and stress level of the hydraulic riveting gun cylinder of the ordinary single-layer cylinder form ultra-high pressure riveting tool are very high. The circumferential stress is the largest among the three-dimensional stresses and is very unevenly distributed along the cylinder wall thickness direction. As the thickness of the cylinder increases, the unevenness becomes more serious. Simply increasing the thickness of the cylinder and improving the strength of the material will aggravate the problem of uneven stress distribution. The present invention adopts the nested combination of double-layer cylinders for the first time. The prestress generated by extrusion and expansion during the nested combination process will make the stress distribution of the cylinder under high pressure more uniform.

[0023] The riveting tool of the present invention improves the utilization rate of materials. In the nested combination of double-layer cylinder bodies, the maximum stress appears on the outer wall of the inner cylinder body and the inner wall of the outer cylinder body. The stress values ​​of the inner outer wall and the outer inner wall are designed to be similar, so that the material can be utilized to the maximum extent.

[0024] The weight of the riveting tool of the present invention is optimized. The existing technical product of a large-sized hydraulic riveting gun for wind power generation weighs 48.5kg, which is difficult to use for high-altitude operations and has extremely high labor intensity. In the present invention, both the inner cylinder body and the outer cylinder body are made of TC4 titanium alloy. Titanium alloy has a significant advantage of low density under excellent strength characteristics. Based on the above two characteristics, the weight is successfully reduced to 27.52kg by applying low-density and high-strength materials and optimizing the cylinder body diameter, which is 43.26% lighter. Reducing the cylinder body diameter reduces weight while ensuring cylinder body strength.

[0025] The riveting tool of the present invention has good formability. The double-layer nesting method requires interference fit to combine the cylinder bodies at both ends together, heat the outer cylinder to expand its inner diameter to be larger than the outer diameter of the inner cylinder, insert it into the inner cylinder, and cool it to fit. The cylinder body made of titanium alloy has good formability and can be processed by various methods such as hot processing and liquid nitrogen cold processing. At the same time, it has high thermoplasticity and low plastic strain hardening index, which can effectively avoid the fracture of the cylinder body.

[0026] The riveting tool of the present invention has excellent high temperature performance. During the high-pressure and high-frequency reciprocating motion of the hydraulic riveting gun, the cylinder body heats up seriously. The existing technology is prone to pressure release and seal failure under high temperature conditions. The titanium alloy combined cylinder body can perform long-term high-intensity work at a temperature of 450℃-500℃.

[0027] The riveting tool of the present invention has excellent safety performance. In the blasting experiment, the failure of the cylinder tail thread and the rupture of the cylinder are the main failure modes of the hydraulic rivet gun. The splashing of high-pressure hydraulic oil at the failure point will cause personal injury to the operator. Based on the strengthening effect of the double-layer alloy cylinder structure on the cylinder tail thread and the overall structure, the blasting pressure is increased from 102MPa of the ordinary single-layer cylinder to 140MPa, and the failure form is changed from cylinder thread failure and rupture to inner cylinder rupture leading to system pressure relief. The double-layer nested structure plays a protective role. On the one hand, the outer cylinder provides the system with high-strength pressure-bearing capacity, and on the other hand, it plays a protective role when the inner cylinder breaks, wrapping the damaged inner cylinder and no high-pressure oil is sprayed during the failure process, which has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the sealing device structure of the present invention.

[0030] Figure 3 It is a schematic diagram of the riveting claws opening structure of the present invention.

[0031] Figure 4 It is a schematic diagram of the compressed and contracted structure of the riveting claws of the present invention.

[0032] Figures 5 to 9 It is a schematic diagram of the riveting process of the ring groove rivet of the present invention.

[0033] Fig.10 It is an enlarged schematic diagram of the oil circuit block structure of the present invention.

[0034] In the figure, 1-riveting claw; 2-riveting anvil; 3-anvil connecting seat; 4-claw connecting seat; 5-front sealing ring; 6-front retaining ring; 7-process plug; 8-oil block; 9-return oil pipe; 10-oil inlet pipe; 11-oil port; 12-anti-loosening pad; 13-riveting gun handle; 14-riveting gun button; 15-claw mounting seat; 16-rear end cover; 17-rear retaining ring; 18-rear baffle; 19-cylinder head retaining ring; 20-piston base; 21-unloading Load rod; 22-inner alloy cylinder body; 23-outer alloy cylinder body; 24-piston spindle; 25-dustproof ring; 26-front static seal; 27-front dynamic seal; 28-base static seal; 29-base dynamic seal; 30-end cover static seal; 31-mounting seat static seal; 32-spindle dynamic seal; 33-short tail rivet; 34-flange ring; 35-wind power installation plate; 36-formed flange ring; 37-oil return port; 38-oil inlet. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0036] Combined with the attached pictures.

[0037] As shown in the figure, the lightweight double-layer composite ultra-high pressure hydraulic riveting tool of the embodiment of the present invention is composed of a double-layer composite cylinder structure including an inner alloy cylinder 22 and an outer alloy cylinder 23. The outer alloy cylinder 23 is a cylinder made of aluminum alloy, alloy steel or titanium alloy; the inner alloy cylinder 22 is a cylinder made of aluminum alloy, alloy steel or titanium alloy; the outer alloy cylinder 23 is the same as or different from the inner alloy cylinder 22. In this example, both the inner alloy cylinder 22 and the outer alloy cylinder 23 are made of titanium alloy cylinders.

[0038] The inner and outer alloy cylinder bodies are nested to form a hydraulic cylinder body, which is an interference fit. The thickness of the outer alloy cylinder body 23 and the inner alloy cylinder body 22 is based on the elastic failure theory, and the shear stress of the inner and outer alloy cylinder bodies is used as the strength measurement standard. The Lame formula is used to optimize the design of the inner and outer diameters of the double-layer cylinder.

[0039] The front sealing ring 5 is assembled at the front end of the inner and outer alloy cylinder body. Figure 2 The structure includes a dust seal 25, a front static seal 26 and a front dynamic seal 27. The front sealing ring 5 is fixed by a front retaining ring 6.

[0040] After the end cover 16 is installed with the end cover static seal 30 and the mounting seat static seal 31, it is assembled to the threaded step at the rear end of the inner alloy cylinder body 22. Figure 1The rear end cover 16 is fixed by a cylinder head retaining ring 19, and its fixing form is that the cylinder head retaining ring 19 is threadedly connected to the inner layer alloy cylinder body 22. A rear baffle 18 is arranged at the end of the cylinder head retaining ring 19 thread, and the latter is fixed by a rear baffle 17.

[0041] The piston of the riveting tool is composed of two parts and is a split piston. The split piston consists of a piston base 20 and a piston spindle 24. Among them, the right area of ​​the piston base 20 is a rodless cavity, and its surface area is directly related to the hydraulic output force. A threaded hole is provided in the center of the piston base 20, which is threadedly connected to the piston spindle 24. The piston base 20 is provided with a unloading hole, and the unloading rod 21 is assembled into the hole to form this type of hydraulic riveting tool unloading device. Function: When the tool output tension reaches the rated load of the hydraulic riveting gun, it automatically unloads to prevent overloading and ensure the safety of the hydraulic riveting tool. The piston base 20 is provided with a base static seal 28 and a base dynamic seal 29. The piston spindle 24 is threadedly connected to the piston base 20, and the piston assembly serves as an intermediate medium for the hydraulic pressure output, and its movement mode is translational motion along the axis of the cylinder body. The piston spindle 24 is provided with a spindle dynamic seal 32.

[0042] The anvil connection seat 3 is threadedly connected to the piston spindle 24, and the riveting anvil 2 is threadedly connected to the anvil connection seat 3. The riveting anvil is responsible for the forming of the short tail rivet flange collar.

[0043] The claw mounting seat 15 is connected to the rear end cover 16 by threads, and is in a stationary state during the entire movement cycle of the riveting tool. The claw mounting seat 15 is provided with threads inside, and the claw connecting seat 4 is connected with the claw 1 by threads. The front end of the claw connecting seat 4 is connected to the riveting claw 1 by threads.

[0044] like Figure 3 The riveting claw 1 can be divided into two states. First, after the heat treatment process, the riveting claw 1 has high toughness and is in an open state. Second, during the riveting process, the axial movement of the riveting anvil 2 causes the relative position between the riveting claw 1 and the riveting claw 1 to change, thereby causing the riveting claw 1 to be compressed and contracted, and is in a contracted state.

[0045] like Figures 5 to 9 As shown, the riveting process includes: Figure 5 Before riveting, it means the preparation work before riveting, that is, the short tail rivet passes through the wind turbine mounting plate and is pre-tightened by the flange ring. Figure 6 The clamping jaws grasp the tail teeth of the rivet, which means that the clamping jaws in the open state are pre-matched with the tail teeth of the rivet. Figure 7 The anvil squeezes the ring, indicating that the axial movement of the riveting anvil 2 causes the relative position of the anvil and the riveting claw 1 to change, thereby causing the riveting claw 1 to contract under pressure and tightly grasp the rivet tail. Figure 8 Riveting is completed, which means that the riveting anvil continues to move along its axis until the end of the stroke. Fig. 9This is the state after riveting, which means that after riveting is completed, the riveting claw 1 and the riveting anvil 2 return to their initial positions, and the flange ring 34 is formed under the action of the riveting anvil 2 to achieve tightening.

[0046] like Figure 1 and Fig.10 As shown, the oil circuit block 8 includes an oil inlet 38, an oil return port 37, and a process plug 7, and hydraulic oil flows inside the oil circuit block to assist in completing the riveting and unriveting actions.

[0047] The oil inlet pipe 10 and the oil return pipe 9 are high-pressure oil pipes with a rated pressure of 70 MPa.

[0048] like Figure 1 As shown, the rivet gun handle 13 is installed at the rear end cover 16 and is fastened by four high-strength bolts. The rivet gun handle 13 is designed in a vertical ear shape, which conforms to the holding habit. A rivet gun button 14 is set at the upper end of the gripping area of ​​the rivet gun handle 13, which is used to control the riveting and de-riveting actions of the tool.

[0049] The support ring in the sealing structure of the present invention is used to support the lip seal ring to prevent it from being deformed or damaged under high pressure. The support ring may be made of materials such as tin bronze to provide sufficient strength and wear resistance; the support ring is used in conjunction with the lip seal ring to prevent the lip seal ring from rolling under high pressure and ensure the sealing effect.

[0050] The lip seal ring in the sealing structure of the present invention relies on its lip to deform under the action of liquid pressure and close to the sealing surface to achieve sealing. The sealing lip of the lip seal ring deforms under the action of liquid pressure, so that the lip edge is close to the sealing surface to achieve sealing; after the lip edge is worn, it has a certain automatic compensation ability to maintain the sealing effect; common lip seal rings are Y-shaped and V-shaped, suitable for different working pressure and speed conditions.

[0051] The dustproof seal ring in the sealing structure of the present invention is used to prevent dust and pollutants from entering the hydraulic system and reduce friction. It is usually made of highly elastic materials such as rubber and polyurethane, and has good wear resistance, oil resistance, and high temperature resistance. The dustproof seal ring often adopts a double-lip structure design to effectively prevent dust and impurities from entering the system and reduce friction. In high-pressure and high-speed environments, the dustproof seal ring may be equipped with a coil spring to increase the preload force to ensure the sealing effect.

[0052] The O-ring in the sealing structure of the present invention is a bidirectional extrusion type sealing element. Under pressure, the shape of the O-ring is similar to that of a liquid with high surface tension, and the pressure is transmitted equally in all directions. The self-sealing of the O-ring is limited. When the internal pressure is too high and exceeds the allowable extrusion gap, a retaining ring can be used to prevent the seal from being squeezed into the gap and causing extrusion damage, and to prevent early failure.

[0053] The back-to-back installation method in the sealing structure of the present invention is a lip seal ring installation method, which is particularly suitable for occasions where the sealing effect needs to be enhanced. The back-to-back installation method can enhance the sealing effect. In the back-to-back installation method, two lip seal rings are installed back-to-back, that is, the two sealing lips are installed in opposite directions. This configuration can provide a double sealing effect to prevent the medium from leaking from both sides; in the back-to-back installation method, the two seal rings can share the pressure, which helps to maintain a better sealing effect in high-pressure applications. Back-to-back installation can reduce the risk of the seal ring being squeezed out of the groove, especially under high pressure or large axial load; the back-to-back installation method is suitable for high-pressure environments because the two seal rings work together to provide better sealing performance. .

[0054] The piston spindle sealing system in the sealing structure of the present invention: Figure 2 Among them, the dust ring 25, the front static seal 26, the main shaft dynamic seal 32, and the front dynamic seal 27 together constitute the piston main shaft sealing system, which adopts the sealing structure of support ring + lip seal ring + support ring + dust seal ring.

[0055] The piston base sealing system in the sealing structure of the present invention: Figure 2 In the piston base, the base static seal 28 and the base dynamic seal 29 together constitute the piston base sealing system, which adopts the structure of lip seal ring + support ring + lip seal ring.

[0056] Static sealing system in the sealing structure of the present invention: Figure 2 In the embodiment, the end cover static seal 30 and the mounting seat static seal 32 are a static sealing system, which adopts an O-ring + retaining ring method.

Claims

1. An ultra-high pressure hydraulic riveting tool, comprising a riveting claw and a riveting anvil driven by a hydraulic cylinder, characterized in that: The oil cylinder body is composed of an outer alloy cylinder body and an inner alloy cylinder body; the outer alloy cylinder body and the inner alloy cylinder body are combined by interference nesting to form an oil cylinder body tube with an integrated structure; in the interference joint surface between the outer alloy cylinder body and the inner alloy cylinder body, the side wall joint surface is a straight cylindrical joint surface structure, the front end joint surface is a radially arranged plane annular joint surface structure, and the arc ring transition joint surface structure is between the side wall joint surface and the front end joint surface.

2. The ultra-high pressure hydraulic riveting tool according to claim 1, characterized in that: The oil cylinder is composed of an outer alloy cylinder body, an inner alloy cylinder body, a front end sealing ring, a piston base, a piston spindle, a rear end cover, a cylinder cover retaining ring, a rear baffle and front and rear retaining rings.

3. The ultra-high pressure hydraulic riveting tool according to claim 2, characterized in that: The front end sealing ring is assembled at the front end of the cylinder body, the inner end is connected to the cylinder body through a step, and the outer end is fixed by a front retaining ring; a dust ring is arranged on the front side of the joint between the front end sealing ring and the piston main shaft, a front end dynamic seal is arranged on the rear side, and a front end static seal is arranged on the joint between the front end sealing ring and the cylinder body.

4. The ultra-high pressure hydraulic riveting tool according to claim 3, characterized in that: The rear end cover is fixed by a cylinder head retaining ring, which is connected to the inner alloy cylinder body through threads, and a rear baffle is arranged at the end of the cylinder head retaining ring thread, which is fixed by the rear baffle; a static seal of the end cover is arranged at the joint of the rear end cover and the inner alloy cylinder body, and a static seal of the mounting seat is arranged at the joint of the rear end cover and the claw mounting seat.

5. The ultra-high pressure hydraulic riveting tool according to claim 3, characterized in that: A threaded hole is arranged at the center of the piston base and is connected to the piston spindle through a thread; a relief hole is arranged at the piston base and forms a hydraulic riveting tool unloading device with the relief rod; a base static seal is arranged at the front end of the joint between the piston base and the piston spindle, and a base dynamic seal is arranged at the joint between the piston base and the inner alloy cylinder body; a spindle dynamic seal is arranged at the joint between the piston spindle and the claw mounting seat.

6. The ultra-high pressure hydraulic riveting tool according to claim 5, characterized in that: The piston spindle seal is a sealing structure of a supporting ring + a lip seal ring + a supporting ring + a dustproof seal ring; the piston base seal is a sealing structure of a lip seal ring + a supporting ring + a lip seal ring.

7. The ultra-high pressure hydraulic riveting tool according to claim 3, characterized in that: The riveting anvil is threadedly connected to the anvil connecting seat, and the anvil connecting seat is threadedly connected to the piston main shaft.

8. The ultra-high pressure hydraulic riveting tool according to claim 3, characterized in that: The riveting claw is threadedly connected to the claw mounting seat, and the claw mounting seat is threadedly connected to the rear end cover.

9. The lightweight ultra-high pressure hydraulic riveting tool according to claim 3, 4 or 5, characterized in that: The static seal is a sealing structure of an O-ring + a retaining ring. The static seal or the dynamic seal includes a lip seal ring and adopts a back-to-back installation structure.

10. The ultra-high pressure hydraulic riveting tool according to claim 3, characterized in that: The outer alloy cylinder body is a cylinder body made of aluminum alloy, alloy steel or titanium alloy; the inner alloy cylinder body is a cylinder body made of aluminum alloy, alloy steel or titanium alloy; the materials of the outer alloy cylinder body and the inner alloy cylinder body are the same or different.

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