A piston pressure testing device

Abstract

The utility model discloses a kind of piston pressure testing devices in the technical field of hydraulic cylinder, including sleeve, the piston piece of being installed in sleeve, buffer detection piece and the first gland and second gland for closing both ends of sleeve are installed on piston piece, the sleeve is formed for testing cavity by piston piece, first gland and second gland, one end of cavity is provided with pressure measuring hole for entering oil, the buffer detection piece includes at least one buffer valve group, the buffer valve group is correspondingly provided with observation hole for observation. By the pressure oil into the cavity and combining observation hole to observe sealing state, the sealing performance of piston piece and its buffer valve group can be independently detected before piston piece is loaded into oil cylinder, the leakage position can be accurately positioned, repeated disassembly and assembly oil cylinder are avoided, and detection efficiency and assembly reliability are improved.

Description

Technical Field

[0001] This utility model relates to a piston pressure testing device, belonging to the field of hydraulic cylinder technology. Background Technology

[0002] In engineering machinery and hydraulic systems, the piston is an important component within the hydraulic cylinder. Its sealing performance and the reliability of its internal buffer structure directly affect the service life and operational stability of the hydraulic cylinder.

[0003] In existing technologies, pistons are typically installed directly into the hydraulic cylinder after assembly, and the sealing performance is then judged by pressure testing the entire cylinder. However, when a buffer valve assembly is installed on the piston, the cause of sealing failure may originate from the sealing structure of the piston body, or from the buffer valve assembly itself or its installation and fit. Under the existing pressure testing method, once leakage occurs, it is difficult to effectively distinguish whether it is caused by piston sealing failure or poor sealing of the buffer valve assembly. It is often necessary to repeatedly disassemble the hydraulic cylinder and reassemble and replace the piston, which is not only complicated to operate and inefficient, but also prone to causing secondary damage to components.

[0004] Furthermore, the existing technology lacks a device and method for separately testing the piston body and its buffer valve assembly before the piston is installed into the oil cylinder. This makes it difficult to effectively control the sealing quality of the piston and buffer valve assembly before assembly, thereby affecting the assembly efficiency and operational reliability of the whole machine. Utility Model Content

[0005] The purpose of this invention is to solve the problems of difficulty in identifying leakage when the piston is installed in the oil cylinder and then subjected to overall pressure testing, as well as the need for repeated disassembly and reassembly of the oil cylinder, low testing efficiency, and high maintenance costs.

[0006] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution: A piston pressure testing device is provided, comprising: a sleeve, a piston installed inside the sleeve, a buffer detection element installed on the piston, and a first pressure cap and a second pressure cap for sealing both ends of the sleeve; the sleeve forms a cavity for testing through the piston, the first pressure cap, and the second pressure cap; One end of the cavity is provided with a pressure measuring hole for oil to enter; The buffer detection element includes a buffer valve assembly; the buffer valve assembly is correspondingly provided with an observation hole for observation.

[0007] Furthermore, the buffer valve assembly is configured as a plurality of valves arranged in a ring array along the axis of the piston.

[0008] Furthermore, the buffer detection component also includes a support ring and a piston seal; both the support ring and the piston seal are disposed on the side wall of the piston component.

[0009] Furthermore, the observation hole is disposed on the surface of the first and second pressure caps.

[0010] Furthermore, both the first and second pressure caps have screw holes on their surfaces for assembly with the buffer detection component.

[0011] Furthermore, the first gland is connected to the end face of the sleeve by screws.

[0012] Furthermore, the first gland and the sleeve are connected by screws, and a first O-ring is provided between the first gland and the sleeve; The second gland and the sleeve are connected by screws, and a second O-ring is provided between the second gland and the sleeve.

[0013] Furthermore, the buffer valve assembly is connected to the cavity.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This invention establishes a sealed test chamber by setting a first pressure cap and a second pressure cap at both ends of the sleeve, which together with the sleeve and piston components. A pressure testing hole is provided at one end of the chamber to allow oil to be introduced for pressure testing. Simultaneously, an observation hole is provided at a position corresponding to the buffer valve assembly, allowing for a direct visual assessment of whether oil leakage occurs during the pressure test. This enables independent testing of the sealing performance of the piston components and the buffer valve assembly. Through this structural design, this application can effectively distinguish whether the leakage source originates from the piston body or the buffer valve assembly, greatly reducing the problem of repeated disassembly and assembly caused by the inability to accurately locate the fault point. This improves the accuracy and efficiency of testing, reduces the risk of secondary damage to the cylinder and related components, and effectively enhances the reliability of the hydraulic assembly process and the overall assembly efficiency. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the piston pressure testing device proposed in this utility model.

[0016] Figure label: 1. Screw; 2. Pressure test hole; 3. Sleeve; 4. First pressure cap; 5. Piston; 6. Buffer valve assembly; 7. O-ring; 8. Support ring; 9. Piston seal; 10. O-ring; 11. Observation hole; 12. Second pressure cap. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] This embodiment provides a piston pressure testing device, including a sleeve 3, a piston 5 installed inside the sleeve 3, a buffer detection element installed on the piston 5, and a first pressure cap 4 and a second pressure cap 12 for sealing both ends of the sleeve 3.

[0020] The sleeve 3 is a hollow cylindrical structure. The piston 5 is located inside the sleeve 3. The first pressure cap 4 and the second pressure cap 12 are respectively located at the openings at both ends of the sleeve 3. The three together form a sealed cavity for testing. A buffer test piece is provided inside the sleeve 3. The buffer test piece divides the sealed cavity into two smaller cavities, which facilitates the sealing test of one of the cavities.

[0021] The smaller cavity has a pressure testing hole 2 at one end, which can be connected to an external hydraulic testing device to allow hydraulic oil to be introduced into the cavity and pressure testing to be performed.

[0022] A buffer detection element is disposed on the piston 5 and includes multiple buffer valve groups 6. The multiple buffer valve groups 6 are arranged in a ring array along the axis of the piston 5. In one specific embodiment, there are four buffer valve groups 6, which are evenly distributed around the circumference of the piston 5. Each buffer valve group 6 is provided with a corresponding observation hole 11. The observation hole 11 is opened on the surface of the first pressure plate 4 and needs to correspond one-to-one with the position of the buffer valve group 6 during the assembly process. When pressurized oil is introduced into the cavity, whether hydraulic oil seeps out through the observation hole 11 can be used to determine whether the sealing performance of the corresponding buffer valve group 6 is qualified.

[0023] In this embodiment, the buffer detection component also includes a support ring 8 and a piston seal 9. Both the support ring 8 and the piston seal 9 are disposed on the side wall of the piston component 5. The piston seal 9 forms a sealing fit with the inner wall of the sleeve 3 to simulate the actual working state of the piston in the cylinder, thereby detecting the sealing performance of the piston component 5 itself.

[0024] The first pressure cap 4 and the second pressure cap 12 are respectively fixedly connected to the two end faces of the sleeve 3 by screws 1. O-rings are provided between the first pressure cap 4 and the sleeve 3, and between the second pressure cap 12 and the sleeve 3. Specifically, the first pressure cap 4 is provided with a first O-ring 10, and the second pressure cap 12 is provided with a second O-ring 7, to ensure the sealing of the entire test chamber and prevent leakage during the pressure test. At the same time, the surfaces of the first pressure cap 4 and the second pressure cap 12 are provided with screw holes that match the buffer detection element, so that after testing one of the smaller chambers, the sealing test of the other smaller chamber can be achieved by reversing the direction.

[0025] In the specific test, the buffer valve assembly 6, support ring 8, and piston seal 9 are first pre-installed on the piston. Then, the piston 5 with the buffer detection component is installed on one side of the pressure cover, which can be the first pressure cover 4 or the second pressure cover 12. Before installation, an O-ring needs to be placed between the two to ensure sealing. Then, the piston 5 is installed on the first pressure cover 4 or the second pressure cover 12. During this process, each buffer valve assembly 6 needs to be aligned with the corresponding observation hole 11. Finally, the sleeve 3 is assembled with the first pressure cover 4 or the second pressure cover 12. Since screw holes are pre-set on the surface of the first pressure cover 4 or the second pressure cover 12, they can be fixed by screws 1 respectively.

[0026] During the test, sleeve 3, piston 5, and one end cap form a closed test chamber. Hydraulic oil is then introduced into the chamber through pressure testing hole 2 and gradually pressurized, causing the hydraulic oil to act on the buffer valve assembly 6 and the piston sealing area. If hydraulic oil leaks out at the corresponding observation hole 11, it indicates a defect in the seal of the corresponding buffer valve assembly 6; if no oil leaks out at observation hole 11, it indicates that the sealing performance of the buffer valve assembly 6 on that side is good.

[0027] After completing the sealing test on one side, the piston 5 is adjusted in the installation direction inside the sleeve 3, and then the reverse pressure test is performed in the same way to test the buffer valve group 6 on the other side, so as to realize the bidirectional test of the buffer valve group 6 and the piston seal, and finally comprehensively judge the overall sealing performance of the piston 5 and its buffer test component.

[0028] It should be mentioned that, as an additional technical effect of this embodiment, this test method can also be used to test the sealing performance of the cylinder body, while detecting whether the buffer valve assembly 6 has good or bad sealing performance.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A piston pressure testing device, characterized in that, include: Sleeve (3), piston (5) installed inside sleeve (3), buffer detection element installed on piston (5), and first pressure cap (4) and second pressure cap (12) for sealing both ends of sleeve (3); the sleeve (3) forms a cavity for testing through piston (5), first pressure cap (4) and second pressure cap (12); One end of the cavity is provided with a pressure measuring hole (2) for the oil to enter; The buffer detection device includes a buffer valve group (6); the buffer valve group (6) is provided with an observation hole (11) for observation.

2. The piston pressure testing device according to claim 1, characterized in that, The buffer valve group (6) is configured as a plurality of valves arranged in a ring array along the axis of the piston (5).

3. The piston pressure testing device according to claim 1, characterized in that, The buffer detection component further includes a support ring (8) and a piston seal (9); the support ring (8) and the piston seal (9) are both disposed on the side wall of the piston component (5).

4. The piston pressure testing device according to claim 1, characterized in that, The observation hole (11) is provided on the surface of the first pressure cover (4) and the second pressure cover (12).

5. The piston pressure testing device according to claim 1, characterized in that, Both the first pressure cap (4) and the second pressure cap (12) have screw holes on their surfaces for assembly with the buffer detection component.

6. The piston pressure testing device according to claim 1, characterized in that, The first pressure cap (4) is connected to the end face of the sleeve (3) by screws (1).

7. The piston testing device according to claim 1, characterized in that, The first pressure cap (4) and the sleeve (3) are connected by screws (1), and a first O-ring (10) is provided between the first pressure cap (4) and the sleeve (3). The second pressure cap (12) and the sleeve (3) are connected by screws (1), and a second O-ring (7) is provided between the second pressure cap (12) and the sleeve (3).

8. The piston pressure testing device according to claim 1, characterized in that, The buffer valve assembly (6) is connected to the cavity.

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