A valve body structure and a quick closing buffer system using the same

Abstract

The application discloses a valve body structure and a quick closing buffer system applying the valve body structure, and relates to the technical field of fluid control valves. The valve body structure comprises a valve seat, an A cavity, a B cavity and a sealing assembly which are arranged in the valve seat; a driving part is arranged at the end of the A cavity; a driving rod is arranged in the A cavity and is connected with a screw rod; a small ring assembly and a sealing small ring are arranged on the screw rod and are limited by a positioning limiting piece; a wear-resistant sleeve is arranged between the small ring assembly and the driving rod; a spring is arranged on the screw rod; a containing groove for containing the spring and a leakage and suction pulp flow channel which is connected with the A cavity, the B cavity and the containing groove are arranged in the small ring assembly. The quick closing buffer system comprises the valve body structure. The sealing piece is impacted and buffered by the spring, the leakage and suction pulp flow channel avoids the spring from being stuck, the wear-resistant sleeve and the laser cladding piston rod improve the wear resistance, the problems that the sealing piece of the existing quick response valve is worn out fast and the spring is easily stuck are solved, the quick closing buffer system has the advantages of quick response, long service life and high stability, and is suitable for harsh working conditions such as pulp conveying.

Description

Technical Field

[0001] This invention relates to the field of fluid control valve technology, specifically to a valve body structure with fast response and buffer sealing functions, and a fast closing buffer system using this valve body structure. Background Technology

[0002] In slurry conveying systems in industries such as mining, metallurgy, and chemicals, valves capable of rapid opening and closing are often required to achieve precise control of slurry transport. Existing fast-response valves mostly use hydraulic cylinders to drive the valve disc, achieving flow channel opening and closing through the contact and separation of seals. However, such valves have the following problems in practical applications: 1. There is a contradiction between response speed and seal life: In order to meet the needs of rapid control, the cylinder piston rod needs to move at high speed, which leads to frequent collisions between seals, which can easily cause seal wear, shorten valve life and increase maintenance costs.

[0003] 2. Spring action is easily obstructed by materials: The springs used for buffering or resetting inside the valve are mostly located in the closed cavity. When slurry or residual gas enters the cavity, the change in cavity volume during the compression or extension of the spring is obstructed, causing the spring to jam and affecting the normal opening and closing of the valve.

[0004] 3. Severe wear on key mating surfaces: The mating surfaces of the drive components and valve disc assembly are in a state of relative motion for a long time and are subject to erosion by slurry, which easily leads to wear, resulting in a decrease in mating accuracy and further affecting sealing performance and valve stability.

[0005] Therefore, developing a valve body structure that can ensure rapid response, effectively reduce seal wear, prevent spring jamming, and improve the wear resistance of key components has become an urgent need in the field of slurry conveying valves. Summary of the Invention

[0006] The purpose of this invention is to provide a valve body structure and a fast-closing buffer system using this valve body structure, achieving the following objectives: 1. Ensuring rapid valve response while reducing impact wear on the seals; 2. Preventing spring movement from being obstructed by slurry or gas; 3. Improving the wear resistance and corrosion resistance of key mating surfaces, extending the overall service life of the valve.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A valve body structure includes a valve seat with an A cavity and a B cavity inside. A sealing assembly is provided at the junction of the A cavity and the B cavity. A driving component is provided at the end of the A cavity away from the B cavity. The driving rod of the driving component extends into the A cavity and is connected to a screw rod via a limiting connector. A small ring assembly and a sealing ring are sleeved on the screw rod and are limited on the screw rod by a positioning limiting component. The small ring assembly is partially sleeved on the driving rod of the driving component, and a wear-resistant sleeve is provided between the small ring assembly and the driving rod. A spring is sleeved on the screw rod, and a receiving groove for accommodating the spring is opened in the small ring assembly. The receiving groove is passed through by the screw rod. One end of the spring abuts against the end of the driving rod, and the other end abuts against the wall of the receiving groove. A slurry discharge channel is provided in the small ring assembly, and the slurry discharge channel connects the A cavity, the B cavity, and the receiving groove.

[0008] In a preferred embodiment, the sealing component is a sealing ring.

[0009] In a preferred embodiment, the driving component is a hydraulic cylinder, and the driving rod is the piston rod of the hydraulic cylinder.

[0010] In a preferred embodiment, the piston rod of the cylinder is made of laser-clad welded hard alloy.

[0011] In a preferred embodiment, the limiting connector is a screw fixing nut, and the positioning limiting component is a valve disc fixing nut.

[0012] In a preferred embodiment, an elastic positioning ring is provided on the side of the spring near the end of the drive rod. The elastic positioning ring is sleeved on the screw, with one side fixedly connected to the end face of the drive rod and the other side fixedly connected to the end of the spring. The elastic positioning ring has an annular oil storage groove with a U-shaped cross-section on the outer peripheral surface of the receiving groove sidewall.

[0013] In a preferred embodiment, the elastic positioning ring is made of elastic wear-resistant rubber with a thickness of 0.8-1.5 mm.

[0014] In a preferred embodiment, the annular oil reservoir on the outer circumference of the elastic positioning ring has a depth of 0.1-0.2 mm and a width of 0.3-0.5 mm.

[0015] In a preferred embodiment, the small ring assembly includes a small ring rear seat and a small ring front seat, the small ring rear seat and the small ring front seat are spliced ​​together to form a common body, the common body has an annular groove, and the sealing small ring is located in the annular groove.

[0016] A fast-closing buffer system using the valve body structure described above includes the valve body structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Buffering and noise reduction, extending the life of the seal: By setting a spring between the drive rod and the small ring assembly, when the sealing assembly and the sealing small ring are in contact, the spring can achieve buffering through deformation, effectively reducing the impact force between the two, and solving the contradiction between fast response and seal life; combined with the double buffering effect of the elastic positioning ring, it further reduces seal wear and improves valve stability.

[0018] 2. Prevent spring jamming: The suction slurry channel inside the small ring assembly connects chamber A, chamber B and the receiving tank. When the spring is compressed or stretched, causing a change in the volume of the receiving tank, the slurry in the chamber can be quickly discharged or drawn in through the suction slurry channel, preventing gas or material from hindering the spring's movement and ensuring the timely and reliable response of the valve.

[0019] 3. Improved wear resistance and corrosion resistance: The wear-resistant sleeve between the small ring assembly and the drive rod can prevent direct contact wear between the two; the cylinder piston rod is made of laser-clad welded hard alloy, which significantly improves the wear resistance and corrosion resistance of the piston rod, making it suitable for the harsh working conditions of slurry transportation; the annular oil reservoir of the elastic positioning ring can store lubricating grease, realize dynamic lubrication, and further reduce wear on the mating surfaces.

[0020] 4. Compact structure and easy assembly: The components are precisely positioned and assembled through connecting parts such as screws and fixing nuts. The structure is reasonably laid out and easy to disassemble and maintain. The small ring assembly adopts a split design, and the components can be replaced individually according to the wear condition, reducing maintenance costs. Attached Figure Description

[0021] Figure 1 This invention relates to a schematic diagram of a valve body structure (the small sealing ring and the large sealing ring are not in contact).

[0022] Figure 2 This invention relates to a schematic diagram of a valve body structure (the small sealing ring and the large sealing ring are not in contact).

[0023] Figure 3 This invention relates to a structural schematic diagram of an elastic positioning plate for a valve body structure.

[0024] Figure 4 This is a partial structural diagram of the edge of an elastic positioning plate in a valve body structure, which relates to the present invention.

[0025] Valve seat 1; Chamber A 2; Chamber B 3; Screw 4; Sealing ring 5; Wear-resistant sleeve 6; Spring 7; Small ring rear seat 8; Small ring front seat 9; Annular groove 10; Receiving groove 11; Slurry discharge channel 12; Sealing ring 13; Oil cylinder 14; Piston rod 15; Screw fixing nut 16; Valve disc fixing nut 17; Elastic positioning ring 18; Annular oil reservoir 19. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example

[0028] As shown in Figures 1 to 4, a valve body structure includes a valve seat 1, which has an A cavity 2 and a B cavity 3. A sealing assembly is provided at the junction of the A cavity 2 and the B cavity 3. A driving component is provided at the end of the A cavity 2 away from the B cavity 3, and the driving rod of the driving component extends into the A cavity 3. Inside cavity 2, a screw 4 is connected to the drive rod via a limiting connector; a small ring assembly and a sealing ring 5 are sleeved on the screw 4, and the small ring assembly and the sealing ring 5 are limited on the screw 4 by a positioning limiting component; the small ring assembly is partially sleeved on the drive rod of the drive component, and a wear-resistant sleeve 6 is provided between the small ring assembly and the drive rod; a spring 7 is sleeved on the screw 4, and a receiving groove 11 for accommodating the spring 7 is opened in the small ring assembly, through which the screw 4 passes; one end of the spring 7 abuts against the end of the drive rod, and the other end abuts against the wall of the receiving groove 11; a slurry discharge channel 12 is provided in the small ring assembly, and the slurry discharge channel 12 is connected to cavity A 2 and cavity B respectively. The cavity 3 and the receiving tank 11; when the driving component drives the driving rod to extend and retract, it can drive the screw 4, the small ring assembly, and the sealing small ring 5 to move synchronously, realizing the contact or separation of the sealing small ring 5 and the sealing assembly. The spring 7 undergoes compression deformation when the sealing small ring 5 is in contact with the sealing assembly. During the deformation of the spring 7, the gas or material in the receiving tank 11 is discharged and sucked in. This enables the rapid opening and closing of cavity A 2 and cavity B 3, meeting the valve response speed requirements in slurry conveying and other scenarios. At the same time, the spring 7 can actively absorb the impact kinetic energy of the sealing small ring 5 when it is in contact with the sealing assembly through compression deformation, converting rigid impact into elastic buffer, fundamentally reducing the wear of the seal caused by high-frequency impact, and extending the replacement cycle of the seal. The slurry discharge channel 12 can balance the receiving tank 11 and cavity A 2 and cavity B 3 in real time. The pressure in cavity 3 prevents spring 7 from getting stuck due to negative or positive pressure caused by changes in the volume of receiving groove 11 when spring 7 deforms, ensuring that the valve can still open and close stably under harsh working conditions. Wear-resistant sleeve 6 can form an isolation and protective layer to prevent metal friction and wear caused by direct contact between small ring assembly and drive rod, while blocking slurry from entering the gap between the two and causing corrosion and jamming, thus improving the operational stability of valve body structure and overall service life.

[0029] Furthermore, the sealing assembly is a large sealing ring 13; the driving rod drives the small sealing ring 5 to move towards and fit with the large sealing ring 13, or to separate from the large sealing ring 13. The large sealing ring 13 adopts an integral ring structure, forming a surface contact seal with the small sealing ring 5. Compared with other sealing forms, it has a larger contact area and a more uniform sealing fit, which can effectively improve the sealing reliability when cavity A 2 and cavity B 3 are isolated. It specifically solves the problem of slurry leakage caused by poor sealing in slurry transportation scenarios. At the same time, the ring structure has stronger impact resistance and can adapt to the high-frequency contact impact of the small sealing ring 5, extending the overall service life of the sealing assembly.

[0030] Furthermore, the driving component is a hydraulic cylinder 14, and the driving rod is the piston rod 15 of the hydraulic cylinder 14. When the hydraulic cylinder 14 drives the piston rod 15 to extend and retract rapidly, it can drive the small ring assembly and the sealing small ring 5 to move through the screw 4. The hydraulic cylinder 14 has the characteristics of large output force, rapid and stable action response, and can accurately match the working conditions of rapid opening and closing of the valve body. It can drive the small ring assembly and the sealing small ring 5 to move quickly and stably towards the sealing assembly, ensuring timely sealing. At the same time, the hydraulic cylinder 14 has strong controllability. The extension and retraction speed of the piston rod 15 can be controlled by adjusting the hydraulic pressure to avoid excessive impact caused by excessive driving speed. In addition, the spring 7 buffer structure protects the seal and improves the controllability and stability of the valve body action.

[0031] Furthermore, the piston rod 15 of the hydraulic cylinder 14 is made of laser-clad welded hard alloy. When the piston rod 15 moves relative to the small ring assembly under the drive of the hydraulic cylinder 14 and is subjected to erosion by media such as slurry, the laser-clad welded hard alloy layer is firmly bonded to the piston rod 15 substrate, forming a high-hardness, high-wear-resistant protective layer on the surface of the piston rod 15. This specifically solves the wear generated by the piston rod 15 during relative movement with the small ring assembly, as well as the erosion of the piston rod 15 surface by hard particles in the slurry. Compared with ordinary piston rods, it can significantly reduce surface wear, avoid the increase in fitting clearance caused by piston rod 15 wear, and thus prevent problems such as sealing failure and movement jamming, extend the service life of the piston rod 15, and reduce maintenance costs.

[0032] Furthermore, the limiting connector is a screw fixing nut 16, and the positioning limiting component is a valve disc fixing nut 17. Tightening the screw fixing nut 16 can fix the screw 4 and the drive rod, and tightening the valve disc fixing nut 17 can limit the small ring assembly and the sealing small ring 5 on the screw 4. The nut connection is a detachable rigid connection, which is simple in structure, convenient to assemble, and easy to maintain and disassemble later. The screw fixing nut 16 can ensure the coaxial fixation of the screw 4 and the drive rod, avoid relative displacement between the two during movement, and ensure the accuracy of power transmission. The valve disc fixing nut 17 can accurately limit the axial movement of the small ring assembly and the sealing small ring 5, prevent them from moving on the screw 4, ensure the accurate contact position of the sealing small ring 5 and the sealing assembly, avoid sealing displacement and aggravated wear caused by component movement, and at the same time ensure the stability of the compression stroke of the spring 7 and ensure the consistency of the buffering effect.

[0033] Furthermore, an elastic positioning ring 18 is provided on the side of the spring 7 near the end of the drive rod. The elastic positioning ring 18 is sleeved on the screw 4, with one side fixedly connected to the end face of the drive rod and the other side fixedly connected to the end of the spring 7. The elastic positioning ring 18 has an annular oil reservoir 19 with a U-shaped cross-section on its outer circumferential surface facing the side wall of the receiving groove 11. When the spring 7 deforms, it causes the elastic positioning ring 18 to undergo elastic deformation simultaneously. The lubricating grease in the annular oil reservoir 19 continuously acts on the mating surface during the deformation of the elastic positioning ring 18 and its relative movement with the side wall of the receiving groove 11. The elastic positioning ring 18 can absorb the impact force between the spring 7 and the end of the drive rod through its own elastic deformation, forming a "spring main buffer + positioning ring secondary buffer" with the spring 7. The dual buffer structure further weakens the impact energy, solving the problem that a single spring buffer is insufficient to completely offset high-frequency impacts, and significantly reducing the impact damage between the end of spring 7 and the end face of the drive rod. At the same time, the radial constraint formed by the sleeve fit with the screw 4 and the fixed connection with the spring 7 limits the radial swing and torsion of the spring 7 during rapid extension and retraction in real time, ensuring that the spring 7 always remains coaxial with the screw 4, avoiding uneven force and increased local wear caused by the spring 7 offset, as well as the problem of the sealing ring 5 being misaligned and impacting the sealing assembly due to the offset of the spring 7. In addition, the elastic positioning ring 18 is fixed to the end face of the piston rod 15 and fits against the side wall of the receiving groove 11, which can form a flexible sealing barrier to specifically block materials such as slurry. The gap between the piston rod 15 and the side wall of the receiving groove 11 is penetrated to prevent component jamming caused by material accumulation and solidification, thus solving the problem of easy slurry entry into the gap in the existing structure. It can also form a synergistic protection with the wear-resistant sleeve 6, respectively isolating the piston rod 15 from the small ring assembly and the elastic positioning ring 18 from the side wall of the receiving groove 11, comprehensively reducing wear caused by relative friction and material erosion. It can also disperse the airflow impact generated by the extension and contraction of the spring 7 through its own elastic deformation, breaking the concentrated transmission of high-frequency airflow, effectively reducing airflow noise and improving the operating environment. The annular oil reservoir 19 can store lubricating grease, providing continuous lubrication for the mating surface of the elastic positioning ring 18 and the side wall of the receiving groove 11, avoiding dry friction wear. Moreover, the U-shaped cross-section of the annular oil reservoir 19 will simultaneously squeeze the internal grease when the elastic positioning ring 18 deforms, actively and evenly coating the mating surface with lubricating grease, realizing dynamic lubrication replenishment, solving the problem that static oil storage is difficult to meet the lubrication requirements of high-frequency relative motion, and further improving the lubrication effect and wear resistance.

[0034] Furthermore, the elastic positioning ring 18 is made of elastic wear-resistant rubber with a thickness of 0.8-1.5mm. When the elastic positioning ring 18 undergoes elastic deformation under the compression of the spring 7 and slides relative to the side wall of the receiving groove 11 with the extension and contraction of the spring 7, the excellent elastic deformation capability of the elastic wear-resistant rubber material can ensure the effective performance of the buffering effect. Its wear resistance can adapt to the long-term relative sliding with the side wall of the receiving groove 11, solving the problems that rigid materials cannot achieve buffering and ordinary elastic materials are prone to wear. The 0.8-1.5mm thickness design is precisely matched. Under the premise of ensuring sufficient deformation margin to achieve sufficient buffering, it can be adapted to the compact installation space inside the valve body and will not interfere with other components. At the same time, this thickness can ensure the structural stability of the connection with the drive rod and the spring 7. It can withstand the repeated compression and sliding under high-frequency rapid opening and closing conditions for a long time, and is not easy to fall off, tear or permanently deform, ensuring the long-term stable performance of each function.

[0035] Furthermore, the annular oil reservoir 19 on the outer circumference of the elastic positioning ring 18 has a depth of 0.1-0.2 mm and a width of 0.3-0.5 mm. When the elastic positioning ring 18 deforms, the wall of the annular oil reservoir 19 deforms synchronously and squeezes the lubricating grease stored inside, so that the grease is evenly coated on the mating surface of the elastic positioning ring 18 and the side wall of the receiving groove 11. The oil reservoir formed by the 0.1-0.2 mm depth and 0.3-0.5 mm width can store sufficient lubricating grease to meet the lubrication needs of long-term high-frequency movement and avoid frequent grease replenishment. The groove wall with its shaped cross-section has excellent elastic deformation capability, which can adaptively release the stress generated when the elastic positioning ring 18 deforms, avoiding cracks in the groove wall due to repeated deformation. At the same time, it significantly enhances the overall deformation margin of the elastic positioning ring 18, enabling it to better adaptively compensate for slight wear on the mating surfaces and maintain sealing and positioning accuracy over a long period of time. In addition, the deformation-extrusion dynamic grease replenishment method can ensure that the mating surfaces are always covered with lubricating grease during high-frequency relative motion, completely avoiding dry friction and solving the problem of easy loss of static oil storage and inconsistent lubrication under high-frequency motion, further improving the lubrication effect and wear resistance.

[0036] Furthermore, the small ring assembly includes a small ring rear seat 8 and a small ring front seat 9. The small ring rear seat 8 and the small ring front seat 9 are adjacently spliced ​​to form a common unit. An annular groove 10 is formed on the common unit, and the sealing small ring 5 is located in the annular groove 10. When the small ring rear seat 8 and the small ring front seat 9 move synchronously with the screw 4, they can drive the sealing small ring 5 in the annular groove 10 to move precisely towards and fit with the sealing assembly, or move away from the sealing assembly to separate. The split small ring assembly design solves the problems of high processing difficulty and the need for complete replacement of the integral small ring assembly due to local wear. It can be used for small ring... The rear seat 8 or the small ring front seat 9 can be replaced individually based on wear, significantly reducing maintenance costs. The annular groove 10 provides dual circumferential and axial restraint for the sealing small ring 5, precisely fixing it in the preset position and preventing radial offset or circumferential torsion during movement. This ensures complete overlap between the sealing small ring 5 and the sealing assembly's contact surface, avoiding leakage problems caused by partial poor fit. At the same time, the spliced ​​integrated structure facilitates the installation and replacement of the sealing small ring 5, and combined with the precise buffering effect of the spring 7, further improves sealing reliability and maintenance convenience.

[0037] Example 2: A rapid shut-off buffer system applying the valve body structure described in Example 1, including the valve body structure described in Example 1; the system realizes the on / off control of fluid transport through the valve body structure, the driving component of the valve body structure receives the control signal and drives the action, the spring 7 and the elastic positioning ring 18 work together to achieve buffering, and the suction / discharge slurry channel 12 ensures the smooth operation of the spring 7. Thus, it can fully inherit the core advantages of the valve body structure such as rapid response, stable sealing, wear resistance and corrosion resistance, realizing precise and rapid control of fluid transport, and solving the problems of delayed response, unreliable sealing and easy wear in existing rapid shut-off systems; the dual buffering of the spring 7 and the elastic positioning ring 18... The impact action can significantly reduce impact damage during system operation and reduce the probability of component failure; the multi-dimensional protection of the elastic positioning ring 18 can improve the system's adaptability to harsh working conditions such as slurry scouring and material accumulation; the overall system has high sealing reliability, low wear rate, long service life, low operating noise, and requires no frequent maintenance. It can be stably applied to slurry conveying equipment and scenarios such as mine tailings conveying equipment, metallurgical slurry conveying pipelines, chemical slurry reactor discharge systems, and coal washing plant slurry conveying devices. It is suitable for the harsh working conditions of slurry conveying in mining, metallurgy, chemical, and coal industries, ensuring the continuous and stable operation of the entire conveying system.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0039] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A valve body structure, characterized in that, The device includes a valve seat with chambers A and B, and a sealing assembly at the junction of chambers A and B. A driving component is located at the end of chamber A furthest from chamber B, with a driving rod extending into chamber A. A screw is connected to the driving rod via a limiting connector. A small ring assembly and a sealing ring are fitted onto the screw, and these are positioned on the screw by a positioning limiter. The small ring assembly is partially fitted onto the driving rod of the driving component, and a wear-resistant sleeve is provided between the small ring assembly and the driving rod. A spring is fitted onto the screw, and a receiving groove for accommodating the spring is formed within the small ring assembly, through which the screw passes. One end of the spring abuts against the end of the driving rod, and the other end abuts against the wall of the receiving groove. A slurry discharge channel is provided within the small ring assembly, connecting chambers A, B, and the receiving groove.

2. The valve body structure according to claim 1, characterized in that, The sealing assembly is a large sealing ring.

3. The valve body structure according to claim 1, characterized in that, The driving component is a hydraulic cylinder, and the driving rod is the piston rod of the hydraulic cylinder.

4. The valve body structure according to claim 3, characterized in that, The piston rod of the hydraulic cylinder is made of laser-clad welded hard alloy.

5. The valve body structure according to claim 1, characterized in that, The limiting connector is a screw fixing nut, and the positioning limiting component is a valve disc fixing nut.

6. The valve body structure according to claim 1, characterized in that, An elastic positioning ring is provided on the side of the spring near the end of the drive rod. The elastic positioning ring is sleeved on the screw, with one side fixedly connected to the end face of the drive rod and the other side fixedly connected to the end of the spring. The elastic positioning ring has an annular oil storage groove with a U-shaped cross-section on the outer circumferential surface of the receiving groove sidewall.

7. The valve body structure according to claim 6, characterized in that, The elastic positioning ring is made of elastic wear-resistant rubber with a thickness of 0.8-1.5mm.

8. The valve body structure according to claim 7, characterized in that, The annular oil storage groove on the outer circumference of the elastic positioning ring has a depth of 0.1-0.2 mm and a width of 0.3-0.5 mm.

9. The valve body structure according to claim 1, characterized in that, The small ring assembly includes a small ring rear seat and a small ring front seat. The small ring rear seat and the small ring front seat are joined together to form a common structure. An annular groove is provided on the common structure, and the sealing small ring is located in the annular groove.

10. A rapid-closing buffer system using the valve body structure described in any one of claims 1-9, characterized in that, Includes the valve body structure described in any one of claims 1-9.

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