A piston device

Abstract

The present invention relates to the technical field of piston sealing, and specifically relates to a piston device, which includes a piston rod assembly, a sealing installation mechanism, and two piston sealing rings. The outer side of the bottom end of the piston rod assembly is provided with a sealing installation mechanism, and the outer side of the sealing installation mechanism is provided with two piston sealing rings. The piston rod assembly includes a rod body, a spline ring is installed on the lower end face of the rod body, and a threaded sleeve is installed inside the spline ring; by actively pressurizing the sealing ring on the piston rod, the contact degree between the sealing ring and the piston cylinder can be effectively improved, thereby maintaining the stable sealing of the piston, and it is convenient to monitor the pressure in the cylinder for detecting the piston sealing; it solves the problems that when the existing sealing ring seals the piston rod, the reciprocating movement of the piston rod driving the sealing ring easily causes the seal to be compressed and deformed, resulting in seal failure, and it is not convenient to monitor the pressure in the piston cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of piston seals, and specifically to a piston device. Background Art

[0002] Construction machinery oil cylinders and pneumatic cylinders work in harsh working conditions for a long time. Therefore, a dust ring is provided outside the hydraulic cylinder to prevent foreign impurities, ash, moisture, etc. from entering the system and damaging the hydraulic cylinder and the sealing system. A piston rod seal is also required to play a main sealing role. Sealing is a mechanism to prevent the leakage of working media (internal leakage and external leakage) and prevent foreign objects from entering hydraulic components and hydraulic systems. Although seals are auxiliary components in hydraulic equipment, the quality of seals and sealing devices directly affects one of the keys to whether the hydraulic system can work properly. To a certain extent, the quality of seals has restricted the improvement of the performance and reliability of hydraulic components and hydraulic systems, the length of service life, and is the key to improving the grade and level of hydraulic equipment and participating in international competition.

[0003] When the existing sealing ring seals the piston rod, the reciprocating movement of the piston rod driving the sealing ring easily causes the seal to be compressed and deformed, thereby causing the seal to fail, and it is not convenient to monitor the pressure in the piston cylinder; therefore, it does not meet the existing requirements, and for this reason, we have proposed a piston device. Summary of the Invention

[0004] The purpose of the present invention is to provide a piston device to solve the problems raised in the above background art that when the existing sealing ring seals the piston rod, the reciprocating movement of the piston rod driving the sealing ring easily causes the seal to be compressed and deformed, thereby causing the seal to fail, and it is not convenient to monitor the pressure in the piston cylinder.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A piston device includes a piston rod assembly, a seal mounting mechanism, and two piston sealing rings. The outer side of the bottom end of the piston rod assembly is provided with a seal mounting mechanism, and two piston sealing rings are installed on the outer side of the seal mounting mechanism. The piston rod assembly includes a rod body, a spline ring is installed on the lower end surface of the rod body, a threaded sleeve is installed inside the spline ring, a pressure detection seat is installed inside the threaded sleeve, and a protective piece is provided on the lower end surface of the pressure detection seat;

[0006] The seal mounting mechanism includes a seal mounting ring. A plurality of axial chutes are provided on the outer side of the middle part of the seal mounting ring. A positioning piece is installed inside the axial chute. An extrusion block is provided in the middle of the positioning piece. Tapered sliders are installed on both sides of the extrusion block. Two annular positioning grooves are provided at both ends of the plurality of axial chutes. A movable pressing ring is installed inside the annular positioning groove;

[0007] The piston seal ring includes an oil seal body. An elastic groove is provided on one side of the oil seal body. An oil seal skeleton and two elastic support wires are installed inside each oil seal body.

[0008] Preferably, the piston rod assembly further includes a connection ring fixedly connected to the bottom end of the rod body. Four anti-deviation strips are installed on the inner side of the connection ring. A central positioning rod is installed on the upper end face of the pressure detection seat. A support sleeve is installed between the middle of the central positioning rod and the rod body.

[0009] Preferably, a plurality of slots are provided on the inner wall of the sealing installation ring. The plurality of anti-deviation strips are inserted into the inner side of the slots and fixedly connected to the connection ring by welding. The sealing installation ring is sleeved on the outer side of the bottom end of the rod body, and the sealing installation ring and the bottom end of the rod body are fixedly connected by the connection ring and the plurality of anti-deviation strips.

[0010] Preferably, a spline groove is provided on the lower end face of the rod body. The spline ring is arranged inside the spline groove. The upper end of the threaded sleeve penetrates through the spline ring and is threadedly connected to the rod body. The bottom end of the central positioning rod penetrates through the support sleeve and is inserted into the inner side of the threaded sleeve.

[0011] Preferably, the central positioning rod is connected to the rod body through the support sleeve. The central positioning rod and the support sleeve are connected by a flat key. A limiting ring is provided on the inner wall of the rod body. The upper end face of the support sleeve is in contact with the limiting ring.

[0012] Preferably, the pressure detection seat and the threaded sleeve are connected by a protective sheet. A tapered hole is provided on the inner side of the bottom end of the threaded sleeve. The protective sheet is arranged inside the tapered hole.

[0013] Preferably, the sealing installation ring is integrally machined. The axial chute coincides with the axis of the sealing installation ring. The plurality of axial chutes are arranged in a circumferential pattern relative to the sealing installation ring.

[0014] Preferably, the positioning piece and the extrusion block are integrally machined. The positioning piece and the sealing installation ring are fixedly connected by screws. Guide inclined surfaces are provided on both sides of the extrusion block and at one end of two adjacent tapered sliders. The extrusion block is in contact with two adjacent tapered sliders through the guide inclined surfaces.

[0015] Preferably, two adjacent tapered sliders are symmetrically installed relative to the extrusion block. Two adjacent tapered sliders slide in the axial chute in the same or opposite directions along the axis of the sealing installation ring. One side of the movable pressing ring is in contact with the ends of a plurality of tapered sliders.

[0016] Preferably, the side of the oil seal body away from the elastic groove is connected to the sealing mounting ring through a movable pressing ring. The oil seal body covers the outer sides of the elastic support wire and the oil seal skeleton. The material of the oil seal skeleton is metal, and the elastic support wire is an annular spring.

[0017] In the present invention, by fixedly installing the positioning piece and the sealing mounting ring, the stable contact between the conical slider and the sealing mounting ring can be effectively maintained. By adjusting the installation gap between the positioning piece and the sealing mounting ring, the depth of insertion of the extrusion block into the axial chute can be adjusted. The extrusion block contacts the adjacent two conical sliders through the guiding inclined surface. Thus, the extrusion block can extrude the adjacent two conical sliders through the guiding inclined surface. Then, the adjacent two conical sliders slide in opposite directions inside the axial chute and push the movable pressing ring. The two movable pressing rings can synchronously axially extrude the side of the oil seal body away from the elastic groove, thereby improving the contact tightness between the oil seal body and the piston cylinder block and achieving the sealing effect during the piston movement.

[0018] In the present invention, the oil seal skeleton can also annularly support the oil seal body to prevent the radial deformation of the oil seal body. And the two elastic support wires can elastically support the oil seal body, making it convenient for the oil seal body to automatically reset after being pressed and avoiding the situation of sealing failure caused by deformation. The pressure detection seat can, through the protective piece, monitor the internal pressure of the piston cylinder in real time during the movement of the piston rod assembly. The central positioning rod and the rod body are connected through a support sleeve, so that the central positioning rod and the support sleeve can effectively support the threaded sleeve and the pressure detection seat, preventing the threaded sleeve and the pressure detection seat from sliding relative to the rod body under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0020] Figure 2 is a schematic partial structural diagram of the whole of the present invention;

[0021] Figure 3 is a schematic partial sectional structural diagram of the piston rod assembly of the present invention;

[0022] Figure 4 is a schematic sectional structural diagram of the anti-deviation strip of the present invention;

[0023] Figure 5 is a schematic sectional structural diagram of the piston seal ring of the present invention;

[0024] Figure 6 is a schematic sectional structural diagram of the sealing installation mechanism of the present invention;

[0025] Figure 7 is an exploded structural diagram of the sealing installation mechanism of the present invention. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Please refer to Figures 1 to 4 , a piston device provided by the present invention includes a piston rod assembly 1, a sealing and mounting mechanism 2, and two piston sealing rings 3. The piston rod assembly 1 includes a rod body 101. A spline ring 102 is installed on the lower end surface of the rod body 101. A threaded sleeve 103 is installed inside the spline ring 102. A spline groove is provided on the lower end surface of the rod body 101. The spline ring 102 is arranged inside the spline groove. The upper end of the threaded sleeve 103 penetrates through the spline ring 102 and is threadedly connected to the rod body 101. A pressure detection seat 107 is installed inside the threaded sleeve 103. A protective piece 104 is provided on the lower end surface of the pressure detection seat 107. The pressure detection seat 107 is connected to the threaded sleeve 103 through the protective piece 104. A tapered hole is provided inside the bottom end of the threaded sleeve 103. The protective piece 104 is arranged inside the tapered hole, so that the pressure detection seat 107 can monitor the internal pressure of the piston cylinder in real time during the movement of the piston rod assembly 1 through the protective piece 104, and further can detect whether the piston seal fails;

[0028] A connecting ring 105 is installed on the outer side of the bottom end of the rod body 101. Four anti-deviation bars 106 are installed inside the connecting ring 105. A central positioning rod 108 is installed on the upper end surface of the pressure detection seat 107. A support sleeve 109 is installed between the middle of the central positioning rod 108 and the rod body 101. The bottom end of the central positioning rod 108 penetrates through the support sleeve 109 and is inserted into the threaded sleeve 103. The central positioning rod 108 is connected to the rod body 101 through the support sleeve 109. The central positioning rod 108 is connected to the support sleeve 109 through a flat key. A limiting ring is provided on the inner wall of the rod body 101. The upper end surface of the support sleeve 109 is in close contact with the limiting ring. The threaded sleeve 103 and the pressure detection seat 107 can be effectively supported through the central positioning rod 108 and the support sleeve 109, avoiding the threaded sleeve 103 and the pressure detection seat 107 from sliding relative to the rod body 101 under pressure.

[0029] Please refer to Figures 2 to 7, a sealing and mounting mechanism 2 is installed on the outer side of the bottom end of the piston rod assembly 1. The sealing and mounting mechanism 2 includes a sealing mounting ring 201. A plurality of slots are provided on the inner wall of the sealing mounting ring 201. A plurality of anti-deviation strips 106 are inserted into the inner side of the slots and fixedly welded to the connecting ring 105. The sealing mounting ring 201 is sleeved on the outer side of the bottom end of the rod body 101, and the sealing mounting ring 201 and the bottom end of the rod body 101 are fixedly connected through the connecting ring 105 and a plurality of anti-deviation strips 106. The anti-deviation strips 106 can effectively prevent the sealing mounting ring 201 from axially deflecting relative to the rod body 101.

[0030] Furthermore, a plurality of axial chutes 207 are provided on the outer side of the middle part of the sealing mounting ring 201. The sealing mounting ring 201 is integrally machined. The axial chutes 207 coincide with the axis of the sealing mounting ring 201. The plurality of axial chutes 207 are arranged in a circular pattern relative to the sealing mounting ring 201. A positioning piece 203 is installed inside the axial chutes 207. An extrusion block 205 is provided in the middle of the positioning piece 203. Conical sliders 204 are installed on both sides of the extrusion block 205. The positioning piece 203 and the extrusion block 205 are integrally machined. The positioning piece 203 and the sealing mounting ring 201 are fixedly connected by screws. Guide inclined surfaces are provided on both sides of the extrusion block 205 and one end of two adjacent conical sliders 204. The extrusion block 205 is in contact with two adjacent conical sliders 204 through the guide inclined surfaces. By adjusting the installation gap between the positioning piece 203 and the sealing mounting ring 201, the depth of the extrusion block 205 inserted into the axial chutes 207 can be adjusted, and then the extrusion block 205 can extrude two adjacent conical sliders 204 through the guide inclined surfaces.

[0031] Two annular positioning grooves 206 are provided at both ends of the plurality of axial chutes 207. A movable pressing ring 202 is installed inside the annular positioning grooves 206. Two adjacent conical sliders 204 are symmetrically installed relative to the extrusion block 205. Two adjacent conical sliders 204 slide in the inner side of the axial chutes 207 along the axis of the sealing mounting ring 201 in opposite or the same directions. One side of the movable pressing ring 202 is in close contact with the ends of a plurality of conical sliders 204. Two adjacent conical sliders 204 push the movable pressing ring 202, so that the two movable pressing rings 202 can axially extrude the side of the oil seal body 301 away from the elastic groove 304 synchronously, thereby improving the contact tightness between the oil seal body 301 and the piston cylinder block.

[0032] Please refer to Figure 5 and Figure 6, two piston sealing rings 3 are installed on the outside of the sealing installation mechanism 2. The piston sealing ring 3 includes an oil seal main body 301. An elastic groove 304 is provided on one side of the oil seal main body 301. An oil seal skeleton 303 and two elastic support wires 302 are installed inside each oil seal main body 301. The side of the oil seal main body 301 away from the elastic groove 304 is connected to the sealing installation ring 201 through a movable pressing ring 202. The oil seal main body 301 covers the outside of the elastic support wire 302 and the oil seal skeleton 303. The material of the oil seal skeleton 303 is metal, and the elastic support wire 302 is an annular spring. The oil seal skeleton 303 can support the oil seal main body 301 annularly to prevent the oil seal main body 301 from deforming radially. And the two elastic support wires 302 can elastically support the oil seal main body 301, so that it is convenient for the oil seal main body 301 to automatically reset after being pressed, avoiding the situation of seal failure caused by deformation.

[0033] During use, the sealing installation ring 201 is sleeved on the outside of the bottom end of the rod body 101, so that the connecting ring 105 drives a plurality of anti-deviation strips 106 to be inserted into the inner sides of the rod body 101 and the sealing installation ring 201. Then, when the connecting ring 105 and the rod body 101 are fixedly connected by screws, the stability of the sealing installation ring 201 is maintained. The anti-deviation strips 106 can effectively prevent the sealing installation ring 201 from axially deflecting relative to the rod body 101. Place the two movable pressing rings 202 inside the annular positioning groove 206, so that an extrusion block 205 and a conical slider 204 are installed between the two movable pressing rings 202. By fixedly installing the positioning piece 203 and the sealing installation ring 201, the stable contact between the conical slider 204 and the sealing installation ring 201 can be effectively maintained. At this time, place the two oil seal main bodies 301 between the movable pressing ring 202 and the sealing installation ring 201;

[0034] When the whole is in use, by adjusting the installation gap between the positioning piece 203 and the sealing installation ring 201, the depth of the extrusion block 205 inserted into the axial chute 207 can be adjusted. Guide slopes are provided at both sides of the extrusion block 205 and the opposite ends of the adjacent two conical sliders 204 facing each other. The extrusion block 205 contacts the adjacent two conical sliders 204 through the guide slopes. Then, the extrusion block 205 can extrude the adjacent two conical sliders 204 through the guide slopes. Then, the adjacent two conical sliders 204 slide in opposite directions inside the axial chute 207 and push the movable pressing ring 202. The two movable pressing rings 202 can simultaneously axially extrude the side of the oil seal main body 301 away from the elastic groove 304, so as to improve the contact tightness between the oil seal main body 301 and the piston cylinder block and achieve the sealing effect during piston movement;

[0035] Inside the oil seal body 301, an oil seal skeleton 303 and two elastic support wires 302 are installed. The oil seal skeleton 303 can provide annular support for the oil seal body 301 to prevent radial deformation of the oil seal body 301. And the two elastic support wires 302 can provide elastic support for the oil seal body 301, so that the oil seal body 301 can automatically reset after being compressed, avoiding the situation of seal failure caused by deformation. A threaded sleeve 103 is connected to the inner side of the bottom end of the rod body 101 by threads. The spline ring 102 and the rod body 101 are fixedly connected through the threaded sleeve 103, so that the spline ring 102 positions the threaded sleeve 103. A tapered hole is provided inside the bottom end of the threaded sleeve 103, which can effectively prevent the protective piece 104 from falling off.

[0036] A pressure detection seat 107 is provided between the protective piece 104 and the central positioning rod 108. The pressure detection seat 107 can monitor the internal pressure of the piston cylinder in real time through the protective piece 104 during the operation of the piston rod assembly 1. The central positioning rod 108 and the rod body 101 are connected through a support sleeve 109, so that the threaded sleeve 103 and the pressure detection seat 107 can be effectively supported by the central positioning rod 108 and the support sleeve 109, preventing the threaded sleeve 103 and the pressure detection seat 107 from sliding relative to the rod body 101 under pressure.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A piston device, comprising a piston rod assembly, a sealing and mounting mechanism, and two piston sealing rings, characterized in that, A sealing and mounting mechanism is installed on the outer side of the bottom end of the piston rod assembly. Two piston sealing rings are installed on the outer side of the sealing and mounting mechanism. The piston rod assembly includes a rod body. A spline ring is installed on the lower end face of the rod body. A threaded sleeve is installed inside the spline ring. A pressure detection seat is installed inside the threaded sleeve. A protective sheet is provided on the lower end face of the pressure detection seat. The sealing and mounting mechanism includes a sealing and mounting ring. A plurality of axial chutes are provided on the outer side of the middle part of the sealing and mounting ring. A positioning piece is installed inside the axial chute. An extrusion block is provided in the middle of the positioning piece. Tapered sliders are installed on both sides of the extrusion block. Two annular positioning grooves are provided at both ends of the plurality of axial chutes. A movable pressing ring is installed inside the annular positioning groove. The piston sealing ring includes an oil seal body. An elastic groove is provided on one side of the oil seal body. An oil seal skeleton and two elastic support wires are installed inside each oil seal body. The sealing and mounting ring is integrally machined. The axial chute coincides with the axis of the sealing and mounting ring. The plurality of axial chutes are arranged in a circumferential pattern relative to the sealing and mounting ring. The positioning piece and the extrusion block are integrally machined. The positioning piece and the sealing and mounting ring are fixedly connected by screws. Guide inclined surfaces are provided on both sides of the extrusion block and at one end of two adjacent tapered sliders. The extrusion block is in contact with two adjacent tapered sliders through the guide inclined surfaces.

2. A piston device according to claim 1, characterized in that, The piston rod assembly further includes a connecting ring fixedly connected to the bottom end of the rod body. Four anti-deviation strips are installed inside the connecting ring. A central positioning rod is installed on the upper end face of the pressure detection seat. A support sleeve is installed between the middle part of the central positioning rod and the rod body.

3. A piston device according to claim 2, characterized in that, A plurality of slots are provided on the inner wall of the sealing and mounting ring. The plurality of anti-deviation strips are inserted into the inside of the slots and welded and fixed to the connecting ring. The sealing and mounting ring is sleeved on the outer side of the bottom end of the rod body, and the sealing and mounting ring and the bottom end of the rod body are fixedly connected through the connecting ring and the plurality of anti-deviation strips.

4. A piston device according to claim 2, characterized in that, A spline groove is provided on the lower end face of the rod body. The spline ring is arranged inside the spline groove. The upper end of the threaded sleeve penetrates through the spline ring and is threadedly connected to the rod body. The bottom end of the central positioning rod penetrates through the support sleeve and is inserted into the inside of the threaded sleeve.

5. A piston device according to claim 3, characterized in that, The central positioning rod is connected to the rod body through the support sleeve. The central positioning rod and the support sleeve are connected by a flat key. A limiting ring is provided on the inner wall of the rod body. The upper end face of the support sleeve is in close contact with the limiting ring.

6. A piston device according to claim 5, characterized in that, The pressure detection seat is connected to the threaded sleeve through the protective sheet. A tapered hole is provided on the inner side of the bottom end of the threaded sleeve. The protective sheet is arranged inside the tapered hole.

7. A piston device according to claim 1, characterized in that, Two adjacent tapered sliders are symmetrically installed relative to the extrusion block. Two adjacent tapered sliders slide in the axial chute along the axis of the sealing and mounting ring in an opposite or same direction. One side of the movable pressing ring is in close contact with the ends of the plurality of tapered sliders.

8. A piston device according to claim 7, characterized in that, The side of the oil seal body away from the elastic groove is connected to the sealing and mounting ring through the movable pressing ring. The oil seal body covers the outside of the elastic support wire and the oil seal skeleton. The material of the oil seal skeleton is metal. The elastic support wire is an annular spring.

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