A piston rod assembly

Abstract

The utility model discloses a piston rod assembly, include: piston body, can be installed in the inside of cylinder body and can reciprocate in cylinder body, piston rod body, can be dismantled and install in the central position of piston body and the other end of piston rod body extends to the outside of cylinder body, buffer pad has two groups respectively installs in the both ends of piston body for slowing down the impact force of piston body and cylinder body, buffer assembly has two groups respectively installs between piston body and buffer pad, buffer pad is sleeved in the outside of piston body, and the outside of buffer pad extends to the outside of piston body, the central position of piston body inboard is provided with a plurality of bellows buffer parts to piston body direction, the utility model discloses install buffer pad in the both ends of piston body, and still install bellows buffer part on buffer pad, reduce the damage of piston body.

Description

Technical Field

[0001] This utility model relates to the field of piston rod technology, specifically a piston rod assembly. Background Technology

[0002] As a core actuator in hydraulic and pneumatic systems, the piston rod assembly enables force transmission and linear motion. It is widely used in critical fields such as engineering machinery, deep-sea drilling, precision machine tools, and new energy equipment. Its performance directly determines the reliability, energy efficiency, and service life of the entire system. Under heavy-load conditions, the piston rod must simultaneously withstand axial alternating loads, radial off-center loads, and harsh environmental corrosion (such as salt spray corrosion on offshore platforms and mud and sand abrasion on engineering machinery). Therefore, stringent requirements are placed on structural strength, surface wear resistance, and sealing reliability.

[0003] In actual operation, the reciprocating movement of the piston rod assembly within the cylinder body frequently reaches the extreme positions at both ends of the cylinder, inevitably resulting in direct or indirect impacts with the cylinder ends. These impacts stem from multiple factors: firstly, under high-pressure drive, the piston rod assembly often possesses significant speed and kinetic energy, making it difficult to achieve complete buffering through conventional braking methods when approaching the end of its stroke; secondly, some equipment, in pursuit of operational efficiency, lacks effective end-effector buffering structures, or the buffering devices age or fail due to long-term use, preventing effective absorption of impact energy. Frequent impacts can trigger a series of serious problems: firstly, the piston rod itself is easily damaged; the instantaneous impact force can cause plastic deformation and cracks at the piston rod ends, or even fracture under long-term fatigue, directly affecting the normal operation of the equipment. Utility Model Content

[0004] The purpose of this utility model is to provide a piston rod assembly that reduces damage to the piston body by installing buffer pads at both ends of the piston body and installing corrugated buffer parts on the buffer pads.

[0005] To address the problems of existing technologies, this utility model provides a piston rod assembly, comprising: a piston body capable of being installed inside a cylinder and reciprocating within the cylinder; a piston rod body detachably installed at the center of the piston body, with the other end of the piston rod body extending to the outside of the cylinder; a buffer pad having two sets respectively installed at both ends of the piston body to reduce the impact force between the piston body and the cylinder; and a buffer assembly having two sets respectively installed between the piston body and the buffer pad; the buffer pad is sleeved on the outside of the piston body, and the outside of the buffer pad extends to the outside of the piston body, and a plurality of corrugated buffer portions are provided at the center of the inner side of the piston body towards the piston body.

[0006] Preferably, one end of the corrugated buffer section is provided with a mounting part, and the piston body is also provided with a limiting ring and a sleeve on both sides. The limiting ring and the sleeve are concentrically arranged, and a cavity is formed between the limiting ring and the sleeve. The mounting part is fixed to the cavity formed between the limiting ring and the sleeve by bolts.

[0007] Preferably, a second mounting groove is provided on the inner side of the buffer pad, and a first mounting groove is provided on both sides of the piston body, and the buffer assembly is disposed in the first mounting groove and the second mounting groove.

[0008] Preferably, each buffer assembly further includes two support rings, and the two support rings are respectively disposed in the first mounting groove and the second mounting groove. Several limiting posts are provided on the opposing sides of the two support rings. The buffer assembly also includes a buffer spring sleeved on the limiting posts.

[0009] Preferably, the outer ring of the piston body is provided with a plurality of slots along its length, and a sealing ring is fitted in the slot.

[0010] Preferably, the sleeve has a first mounting hole, and the piston rod body has a second mounting hole corresponding to the first mounting hole. A fixing bolt is screwed into the first mounting hole, and the fixing bolt is also screwed into the second mounting hole.

[0011] Preferably, the thickness of the sealing ring is 2mm-5mm, and the material of the sealing ring is nitrile rubber or silicone rubber.

[0012] Preferably, the thickness of the support ring is 3mm-5mm, and the material of the support ring is copper sheet.

[0013] The advantages of this utility model compared to the prior art are: This application constructs a dual-buffer structure to achieve graded absorption of impact energy by assembling buffer pads at both ends of the piston body and integrally forming a corrugated buffer section on one side of the buffer pad. When the piston body moves to the extreme positions at both ends of the cylinder under pneumatic or hydraulic drive, the cylinder end first contacts the buffer pad. At this time, the corrugated buffer section undergoes regular deformation due to compression, and through the step-by-step compression of the wave-shaped structure, part of the impact kinetic energy is converted into elastic potential energy, completing the first stage of buffering. To further improve the buffering effect and avoid damage to the buffer pad due to local stress concentration, this application adds a buffer assembly between the piston body and the buffer pad. This buffer assembly includes two annular support rings. One support ring is embedded in the second mounting groove on the side end face of the buffer pad facing the piston body, and the other support ring is fixed to the first mounting groove at the corresponding end of the piston body by bolts. The axis of the two support rings is collinear with the axis of the piston body. The support ring effectively increases the contact area between the buffer assembly, the buffer pad, and the piston body, allowing the force generated during buffering to be evenly distributed over a larger contact surface. This avoids damage to the buffer pad caused by excessive local pressure when the buffer spring directly contacts the buffer pad in traditional structures, such as tearing or deformation. Simultaneously, the buffer spring's two ends abut against two support rings. After the corrugated buffer section completes the first stage of buffering, the buffer spring is further compressed to absorb the remaining impact energy, achieving the second stage of buffering through elastic deformation. This significantly reduces the impact force between the piston body and the cylinder end, extending the service life of the piston rod assembly. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a piston rod assembly according to this utility model.

[0015] Figure 2 This is an exploded structural diagram of the piston body, buffer pad, and buffer assembly of a piston rod assembly according to this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the piston rod body of a piston rod assembly according to this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the buffer pad of a piston rod assembly according to this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of the buffer component of a piston rod assembly according to this utility model.

[0019] Figure 6 This is a three-dimensional structural diagram of the piston body of a piston rod assembly according to this utility model.

[0020] The figures are labeled as follows: 1. Piston body; 11. Slot; 12. First mounting groove; 13. Limiting ring; 14. Sleeve; 15. First mounting hole; 2. Piston rod body; 21. Second mounting hole; 3. Buffer pad; 31. Second mounting groove; 32. Corrugated buffer part; 33. Mounting part; 4. Buffer assembly; 41. Support ring; 411. Limiting post; 42. Buffer spring; 5. Sealing ring. Detailed implementation method. To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0021] Reference Figures 1-6 As shown, this utility model provides a piston rod assembly, including: a piston body 1, which can be installed inside a cylinder and reciprocate within the cylinder; the piston body 1, as the core load-bearing component of the assembly, has an outer contour adapted to the inner wall of the cylinder and can reciprocate stably along the axial direction inside the cylinder. By forming a closed chamber with the cylinder, it can effectively transmit pneumatic or hydraulic driving force, while providing a mounting base for the buffer pad 3 and the buffer assembly 4. A piston rod body 2, which can be detachably installed at the center of the piston body 1 and has its other end extending to the outside of the cylinder; the piston rod body 2 is used to convert the reciprocating motion of the piston body 1 into the driving force of an external actuator. The detachable design facilitates later maintenance and replacement, reducing repair costs when components are damaged. The buffer pad 3 has two sets installed at both ends of the piston body 1 to reduce the impact force between the piston body 1 and the cylinder; the buffer assembly 4 has two sets installed between the piston body 1 and the buffer pad 3; the buffer pad 3 is sleeved on the outside of the piston body 1, and the outside of the buffer pad 3 extends to the outside of the piston body 1; a plurality of corrugated buffer parts 32 are provided at the center of the inner side of the piston body 1 in the direction of the piston body 1.

[0022] When the piston rod assembly reciprocates along the cylinder axis under pneumatic or hydraulic pressure, the piston body 1 drives the piston rod body 2 to move synchronously. When the piston body 1 approaches the extreme positions at both ends of the cylinder, the buffer pad 3 first contacts the cylinder end. Its outer extension absorbs part of the impact kinetic energy through initial deformation, while the inner corrugated buffer part 32 contracts regularly due to compression, converting the impact energy into elastic potential energy, completing the first stage of buffering. As the piston body 1 continues to move towards the cylinder end, the deformation of the buffer pad 3 is transmitted to the buffer assembly 4, further absorbing the remaining impact energy, achieving the second stage of buffering. Through the synergistic effect of the buffer pad 3 and the buffer assembly 4, the impact force of the piston rod assembly during reciprocating motion to both ends of the cylinder is gradually attenuated, significantly reducing the risk of wear and damage to the piston body 1, piston rod body 2, and cylinder, thereby extending the service life of the entire assembly and improving the stability of equipment operation.

[0023] One end of the corrugated buffer section 32 is provided with a mounting section 33. The piston body 1 is also provided with a limiting ring 13 and a sleeve 14 on both sides. The limiting ring 13 and the sleeve 14 are concentrically arranged, and a cavity is formed between the limiting ring 13 and the sleeve 14. The mounting section 33 is fixed to the cavity formed between the limiting ring 13 and the sleeve 14 by bolts.

[0024] Made of elastic material, its design extending to the outside of the piston body 1 allows it to preferentially contact the cylinder end, initially absorbing impact energy through its own deformation. Multiple corrugated buffer sections 32 are distributed along the center of the piston body 1, utilizing the progressive compression characteristics of the corrugated structure to further enhance the buffering effect and prevent direct rigid collision between the piston body 1 and the cylinder. One end of each corrugated buffer section 32 has a mounting section 33, which is bolted into the cavity formed between the limiting ring 13 and the sleeve 14. This fixing method ensures a firm connection between the buffer pad 3 and the piston body 1.

[0025] The sleeve 14 has a first mounting hole 15, and the piston rod body 2 has a second mounting hole 21 corresponding to the first mounting hole 15. A fixing bolt is screwed into the first mounting hole 15, and the fixing bolt is also screwed into the second mounting hole 21. When the piston rod body 2 is installed on the piston body 1, the first mounting hole 15 and the second mounting hole 21 are aligned. By screwing the fixing bolt into the first mounting hole 15, with the other end of the fixing bolt screwed into the second mounting hole 21, a firm connection is achieved between the piston rod body 2 and the piston body 1. This detachable design facilitates later maintenance and replacement, reducing repair costs when components are damaged.

[0026] The inner side of the buffer pad 3 is provided with a second mounting groove 31, and the piston body 1 is provided with first mounting grooves 12 on both sides. The buffer assembly 4 is disposed in the first mounting groove 12 and the second mounting groove 31. Each buffer assembly 4 also includes two support rings 41, which are respectively disposed in the first mounting groove 12 and the second mounting groove 31. Several limiting posts 411 are provided on the facing sides of the two support rings 41. The buffer assembly 4 also includes a buffer spring 42 sleeved on the limiting posts 411. The thickness of the support ring 41 is 3mm-5mm, and the material of the support ring 41 is copper sheet. Copper sheet has good ductility and wear resistance, and can better disperse stress during the buffering process.

[0027] As the piston body 1 continues to move towards the end of the cylinder, the deformation of the buffer pad 3 is transmitted to the buffer assembly 4. At this time, the buffer spring 42, sleeved on the limiting post 411, begins to compress under the constraint of the two support rings 41. The limiting post 411 ensures that the buffer spring 42 does not shift, while the copper support rings 41 evenly distribute the force and further absorb the remaining impact energy through elastic deformation, achieving the second stage of buffering. During this process, the support rings 41 ensure that the buffering force is evenly distributed on the contact surface between the buffer pad 3 and the piston body 1, avoiding component damage caused by local stress concentration. Through the synergistic effect of the buffer pad 3 and the buffer assembly 4, the impact force of the piston rod assembly during reciprocating motion to both ends of the cylinder is gradually attenuated, significantly reducing the risk of wear and damage to the piston body 1, piston rod body 2, and cylinder, thereby extending the service life of the entire assembly and improving the stability of equipment operation.

[0028] The outer ring of the piston body 1 also has several grooves 11 along its length, and a sealing ring 5 is fitted in each groove 11. The sealing ring 5 has a thickness of 2mm-5mm and is made of nitrile rubber or silicone rubber. Nitrile rubber has good oil resistance and wear resistance, while silicone rubber has excellent high and low temperature resistance. A suitable material can be selected according to different working conditions. The sealing ring 5 effectively enhances the sealing between the piston body 1 and the cylinder, prevents leakage of air or hydraulic media, ensures stable pressure within the cylinder, and ensures efficient transmission of driving force.

[0029] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A piston rod assembly, characterized in that... ,include: The piston body (1) can be installed inside the cylinder and can reciprocate within the cylinder; The piston rod body (2) is detachably mounted at the center of the piston body (1) and the other end of the piston rod body (2) extends to the outside of the cylinder. The buffer pad (3) has two sets installed at both ends of the piston body (1) to reduce the impact force between the piston body (1) and the cylinder. The buffer assembly (4) has two sets respectively installed between the piston body (1) and the buffer pad (3); The buffer pad (3) is fitted on the outside of the piston body (1), and the outside of the buffer pad (3) extends to the outside of the piston body (1). Multiple corrugated buffer parts (32) are provided at the center of the inner side of the piston body (1) in the direction of the piston body (1).

2. A piston rod assembly according to claim 1, characterized in that... The corrugated buffer part (32) is provided with a mounting part (33) at one end. The piston body (1) is also provided with a limiting ring (13) and a sleeve (14) on both sides. The limiting ring (13) and the sleeve (14) are concentrically arranged, and a cavity is formed between the limiting ring (13) and the sleeve (14). The mounting part (33) is fixed to the cavity formed between the limiting ring (13) and the sleeve (14) by bolts.

3. A piston rod assembly according to claim 1, characterized in that... The buffer pad (3) is further provided with a second mounting groove (31) on the inner side, and the piston body (1) is provided with a first mounting groove (12) on both sides, and the buffer assembly (4) is provided in the first mounting groove (12) and the second mounting groove (31).

4. A piston rod assembly according to claim 3, characterized in that... Each buffer assembly (4) also includes two support rings (41), and the two support rings (41) are respectively set in the first mounting groove (12) and the second mounting groove (31). Several limiting posts (411) are provided on the opposite sides of the two support rings (41). The buffer assembly (4) also includes a buffer spring (42) sleeved on the limiting post (411).

5. A piston rod assembly according to claim 1, characterized in that... The outer ring of the piston body (1) is provided with several slots (11) along its length, and a sealing ring (5) is fitted in the slot (11).

6. A piston rod assembly according to claim 2, characterized in that... The sleeve (14) has a first mounting hole (15), and the piston rod body (2) has a second mounting hole (21) corresponding to the first mounting hole (15). A fixing bolt is screwed into the first mounting hole (15), and the fixing bolt is screwed into the second mounting hole (21).

7. A piston rod assembly according to claim 5, characterized in that: The thickness of the sealing ring (5) is 2mm-5mm, and the material of the sealing ring (5) is nitrile rubber or silicone rubber.

8. A piston rod assembly according to claim 4, characterized in that: The thickness of the support ring (41) is 3mm-5mm, and the material of the support ring (41) is copper sheet.

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