A kind of tool for sliding valve sleeve groove surface sealing

Abstract

The utility model discloses a kind of for slide valve sleeve groove face sealing tool, the utility model relates to slide valve sleeve sealing detection technical field, scheme includes: a kind of for slide valve sleeve groove face sealing tool, comprising: support shaft, support shaft is opened with containing cavity along axial direction, containing ring groove is opened with guide channel in the two sides of support shaft, guide channel is communicated with containing cavity;Butting component, butting component is installed in guide channel, butting component can reciprocate along the extension direction of guide channel;Expansion sealing ring, expansion sealing ring is sleeved in containing ring groove, expansion sealing ring is coupled with butting component;Driving axle, driving axle is detachably installed in containing cavity, driving axle can drive butting component moves towards expansion sealing ring;It can realize the single-piece independent sealing detection of slide valve sleeve bare groove face, improve detection efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the field of valve sleeve sealing detection technology, specifically to a tooling for sealing the groove surface of a valve sleeve. Background Technology

[0002] As a core control element in hydraulic, pneumatic, and other fluid control systems, the spool valve's core functions revolve around fluid flow control, direction switching, and flow regulation. It serves as a crucial link between the system's power source and actuators. From a technical perspective, the spool valve achieves fluid flow path switching by changing the relative position of the valve core shoulder and the valve sleeve's oil (or air) port through the axial sliding of the valve core within the valve sleeve. This structural characteristic allows it to integrate multi-path control functions, meeting the coordinated operation requirements of multiple actuators in complex systems.

[0003] Currently, the industry generally relies on overall pressure testing after the spool valve assembly is completed to test the sealing performance of the spool valve sleeve. This requires assembling the spool valve sleeve with components such as the valve core and end cap into a complete valve before introducing a pressurized medium to determine the sealing performance. However, this method has significant limitations: because the test object is the entire valve system, once a leak is detected, it is impossible to directly locate the source of the fault. The leak may originate from defects in the spool valve sleeve groove surface (such as micro-cracks or dimensional deviations), or it may be caused by excessive clearance between the valve core and the valve sleeve, aging of the end cap seals, or assembly deviations. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing fixture for the groove surface of a spool valve sleeve. It addresses the problem in the existing technology that the sealing performance test of the spool valve sleeve relies on assembly pressure testing and lacks a dedicated sealing performance test method for the bare groove surface of the spool valve sleeve. It proposes a solution that enables independent sealing performance test of the bare groove surface of the spool valve sleeve, thereby improving testing efficiency and reliability.

[0005] This utility model is achieved through the following technical solution:

[0006] A sealing fixture for a slide valve sleeve groove includes: a support shaft with an axially oriented cavity, accommodating annular grooves on both sides of the support shaft, and guide channels in the accommodating annular grooves communicating with the accommodating cavity; an abutment assembly installed in the guide channels and capable of reciprocating along the extension direction of the guide channels; an expansion sealing ring fitted into the accommodating annular grooves and coupled to the abutment assembly; and a drive shaft detachably installed in the accommodating cavity and capable of driving the abutment assembly to move toward the expansion sealing ring.

[0007] Furthermore, in this utility model, the aforementioned accommodating annular groove is provided with multiple guide channels along the circumferential direction; each of the multiple guide channels is equipped with an abutment component, and all of the multiple abutment components are coupled to the expansion sealing ring.

[0008] Furthermore, in this utility model, the aforementioned abutting component includes a transmission slider, which slides and guides the guide channel; a guide slope is provided at one end of the transmission slider facing the accommodating cavity, which can form a guide engagement with the active drive shaft; wherein, when the active drive shaft is inserted into the accommodating cavity, the active drive shaft can drive the transmission slider to move toward the expansion sealing ring, thereby causing the expansion sealing ring to be compressed and undergo expansion deformation.

[0009] Furthermore, in this invention, an elastic sealing medium is installed at the end of the guide channel near the expansion sealing ring; the elastic sealing medium can seal the gap between the guide channel and the external environment, and the elastic sealing medium can transmit the thrust of the transmission slider to the expansion sealing ring.

[0010] Furthermore, in this invention, a limiting component is installed at the end of the support shaft; the limiting component can cooperate with the active drive shaft to limit the active drive shaft within the accommodating cavity.

[0011] Furthermore, in this utility model, the aforementioned limiting component includes: a mounting base, which is mounted on the end of the support shaft and has a mounting groove; a limiting pin, which is disposed within the mounting groove; and a return spring, which is sleeved on the outside of the limiting pin, with one end of the return spring connected to the outer wall of the limiting pin and the other end of the return spring connected to the inner wall of the mounting groove.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0013] 1. The present invention, in cooperation with the support shaft, expansion sealing ring and abutment component, allows the abutment component to be driven by the active drive shaft to squeeze the expansion sealing ring during the testing operation. This causes the expansion sealing ring to evenly fill the annular gap between the support shaft and the valve sleeve, enabling direct single-piece independent sealing performance testing of the bare groove surface of the valve sleeve. This avoids the efficiency loss caused by redundant testing processes in traditional assembly pressure testing, ensures the identification of sealing defects in the valve sleeve groove surface, and meets the quality control requirements of the production process.

[0014] 2. In this utility model, the transmission slider in the guide channel can apply a uniform circumferential extrusion force to the expansion sealing ring. At the same time, the elastic sealing medium at the end of the guide channel blocks the leakage of the detection medium, preventing unqualified products caused by detection errors from flowing into the downstream process, ensuring the accuracy and stability of the detection results, and improving the reliability of the valve sleeve sealing detection. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0016] Figure 1This is a schematic diagram of a tooling for sealing the groove surface of a slide valve sleeve;

[0017] Figure 2 A schematic diagram illustrating a sealing fixture for a slide valve sleeve groove, showing the accommodating annular groove;

[0018] Figure 3 A schematic diagram showing the receiving cavity of a tooling for sealing the groove surface of a slide valve sleeve;

[0019] Figure 4 Cross-sectional view after installing the elastic sealing medium in the guide channel;

[0020] Figure 5 This is a cross-sectional view of the limiting component.

[0021] The attached diagram shows the markings and corresponding component names:

[0022] 1-Support shaft, 2-Expansion sealing ring, 3-Drive shaft, 4-Limiting component, 5-Operating handle, 6-Accommodating ring groove, 7-Transmission slider, 8-Guide channel, 9-Accommodating cavity, 10-Guide slope, 11-Elastic sealing medium, 12-Mounting base, 13-Mounting channel, 14-Reset spring, 15-Limiting pin. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0024] Example

[0025] Please refer to Figures 1 to 5 This utility model provides a sealing fixture for the groove surface of a slide valve sleeve. It includes a support shaft 1, an abutment assembly, an expansion sealing ring 2, and a drive shaft 3. The support shaft 1 has a receiving cavity 9 along its axial direction, and receiving ring grooves 6 are respectively formed on both sides of the outer peripheral wall of the support shaft 1. Each receiving ring groove 6 has a corresponding guide channel 8, which communicates with the receiving cavity 9. The abutment assembly is slidably assembled within the guide channel 8, enabling reciprocating movement along the extension direction of the guide channel 8. The expansion sealing ring 2 is fitted into the receiving ring groove 6, and the expansion sealing ring 2 maintains a coupling relationship with the abutment assembly to ensure effective force transmission. The drive shaft 3 is detachably installed within the receiving cavity 9 of the support shaft 1.

[0026] During the valve sleeve sealing test, the operator inserts the support shaft 1 into the valve sleeve from one end. The outer diameter of the support shaft 1 and the inner diameter of the valve sleeve are pre-designed to be compatible, ensuring coaxiality and initial fit accuracy after assembly. At this time, the expansion sealing ring 2 is pre-installed in the receiving annular groove 6 of the support shaft 1. The outer circumferential surface of the expansion sealing ring 2 is flush with the outer side wall of the support shaft 1, or only slightly protrudes from the side wall of the support shaft 1. This significantly reduces the initial compressive force between the expansion sealing ring 2 and the inner wall of the valve sleeve during the insertion of the support shaft 1 into the valve sleeve, thereby reducing the assembly resistance of the support shaft 1 and ensuring that the support shaft 1 can smoothly enter the valve sleeve and reach the preset assembly position.

[0027] After the support shaft 1 is assembled, the operator inserts the drive shaft 3 into the receiving cavity 9 along the axial direction of the support shaft 1. As the drive shaft 3 is continuously inserted into the receiving cavity 9, the drive shaft 3 will form a rigid abutment with the abutment component in the guide channel 8; under the axial driving force of the drive shaft 3, the abutment component will move along the guide channel 8 toward the expansion sealing ring 2, and finally form a tight abutment with the expansion sealing ring 2.

[0028] During this process, the abutting component applies a compressive force to the expansion sealing ring 2, causing the expansion sealing ring 2 to elastically expand and deform between the receiving annular groove 6 of the support shaft 1 and the inner wall of the valve sleeve. The deformed expansion sealing ring 2 can fill the annular gap between the outer wall of the support shaft 1 and the inner wall of the valve sleeve, thereby completely eliminating the leakage problem of the test medium during the sealing test and providing structural assurance for the accuracy of the test results.

[0029] It should be noted that when the support shaft 1 is fully embedded in the valve sleeve, the two expansion sealing rings 2 are located on both sides of the valve sleeve, and the annular space between the two expansion sealing rings 2 constitutes the target area for sealing performance testing. An airflow channel can be preset on the support shaft 1, with one end of the airflow channel connected to the testing area between the two expansion sealing rings 2 and the other end extending to the outside of the support shaft 1;

[0030] The airflow channel layout path must avoid the guide channel 8 to prevent spatial interference with the sliding trajectory of the contact component, ensuring unobstructed airflow and independence of component movement. Operators can connect an external air source's air pipe to the exposed port of the airflow channel and introduce gas at a preset pressure into the detection area to evaluate the sealing performance of the valve sleeve groove.

[0031] The structural parameters of the support shaft 1 are preset based on the dimensions of the valve sleeve of the same specification to be tested, ensuring that the inner diameter of the support shaft 1 matches the corresponding valve sleeve and providing basic assembly conditions for sealing performance testing. When testing other types of valve sleeves is required, the structural dimensions of the support shaft 1 can be customized according to the specific dimensional parameters of the target valve sleeve.

[0032] It should be noted that this method is directly applicable to spool valve sleeves without vents or oil holes. Because these spool valve sleeves have no additional through-holes in their inner wall, the risk of leakage from vents or oil holes in non-test areas during sealing tests can be avoided at the structural level, ensuring the validity of the test results. For spool valve sleeves with vents or oil holes, flexible plugs can be used to seal them during testing.

[0033] Please refer to Figures 2 to 4 In some embodiments of this application, each receiving annular groove 6 of the support shaft 1 is provided with multiple guide channels 8 along the circumferential direction, and each guide channel 8 is equipped with a corresponding abutment component. All abutment components are coupled with the expansion sealing ring 2 in the receiving annular groove 6 to ensure the effective transmission of force.

[0034] When the drive shaft 3 is axially inserted into the accommodating cavity 9 of the support shaft 1, the drive shaft 3 can establish a driving engagement relationship with multiple sets of abutment components at the two accommodating annular grooves 6. Among them, the multiple abutment components on the same accommodating annular groove 6 are evenly distributed along the circumferential direction. Under the synchronous drive of the drive shaft 3, the multiple sets of abutment components can apply a uniform circumferential compressive force to the expansion sealing ring 2, causing the expansion sealing ring 2 to deform uniformly along the circumferential direction, thereby ensuring that the annular gap between the support shaft 1 and the spool sleeve can be completely filled.

[0035] Please refer to Figure 3 In some embodiments of this application, the abutment component includes a transmission slider 7, which forms a sliding guide engagement with the guide channel 8. One end of the transmission slider 7 facing the receiving cavity 9 is provided with a guide slope 10, which can form a guide engagement structure with the drive shaft 3. The total length of the transmission slider 7 is slightly greater than the length of the guide channel 8.

[0036] In the initial state, a portion of the transmission slider 7 extends into the receiving cavity 9. When the drive shaft 3 is inserted axially into the receiving cavity 9, the outer peripheral wall of the drive shaft 3 comes into contact with the guide slope 10 of the transmission slider 7. Through the guiding action of the slope, the driving force of the drive shaft 3 is converted into a component force that causes the transmission slider 7 to move towards the expansion sealing ring 2. Under the action of this component force, the end of the transmission slider 7 away from the receiving cavity 9 will slightly protrude from the guide groove 8 and press against the expansion sealing ring 2, causing the expansion sealing ring 2 to expand and deform under the radial extrusion force, thereby achieving the sealing function.

[0037] Please refer to Figure 4 In some embodiments of this application, an elastic sealing element 11 is installed at the end of the guide channel 8 near the expansion sealing ring 2. The elastic sealing element 11 has both sealing and force transmission functions;

[0038] Firstly, the elastic sealing medium 11 seals the gap between the guide channel 8 and the external environment, thus blocking the path of the detection medium to leak to the outside through the port of the guide channel 8 from a structural level. Secondly, the elastic sealing medium 11 acts as a force transmission intermediate, transmitting the thrust of the transmission slider 7 to the expansion sealing ring 2.

[0039] Specifically, when the transmission slider 7 moves along the guide channel 8 toward the expansion sealing ring 2, it applies a squeezing force to the elastic sealing medium 11, causing the elastic sealing medium 11 to undergo controllable deformation. At this time, the transmission slider 7 forms an indirect contact with the expansion sealing ring 2 through the deformed elastic sealing medium 11, and transmits the driving force to the expansion sealing ring 2, pushing the expansion sealing ring 2 to deform in order to achieve sealing.

[0040] It should be noted that the elastic sealing element 11 can be made of materials such as polyurethane rubber or nitrile rubber, which have suitable sealing and deformation characteristics. The thickness needs to be pre-designed to meet the requirements of extrusion deformation (possessing good deformability) to ensure the transmission of the force from the transmission slider 7. The elastic sealing element 11 and the guide channel 8 can be fixed in the following ways:

[0041] Firstly, a special adhesive that matches the material properties of the elastic sealing medium 11 is selected. For example, polyurethane rubber medium is adapted to polyurethane structural adhesive, and nitrile rubber medium is adapted to cyanoacrylate or nitrile-specific adhesive. The interfacial bonding force of the adhesive firmly bonds the elastic sealing medium 11 to the port of the guide channel 8, while ensuring the sealing of the bonding surface and preventing the medium from penetrating from the bonding gap.

[0042] Secondly, an insert groove adapted to the shape of the elastic sealing medium 11 is preset in the guide channel 8 near the port. After the elastic sealing medium 11 is inserted into the insert groove, bolts are arranged circumferentially along the edge of the elastic sealing medium 11 for fastening. The mechanical constraint force of the bolts restricts the displacement of the elastic sealing medium 11. Even if the elastic sealing medium 11 is deformed by compression, it can effectively prevent it from falling out of the installation position, ensuring the sealing function and force transmission effect.

[0043] In some embodiments of this application, a limiting component 4 is installed at the end of the support shaft 1. The limiting component 4 can form a rigid limiting fit with the drive shaft 3 to achieve positioning constraint of the drive shaft 3 within the accommodating cavity 9. When the drive shaft 3 is fully inserted into the accommodating cavity 9 along the axial direction and reaches the preset working position, the limiting component 4 can form an axial limit on the drive shaft 3. At this time, the operator does not need to continuously apply gripping force, effectively preventing the drive shaft 3 from axially slipping due to vibration or external force interference during the testing process, and ensuring the continuity and reliability of the testing operation.

[0044] Please refer to Figure 5Specifically, the limiting component 4 consists of a mounting base 12, a limiting pin 15, and a return spring 14: the mounting base 12 is assembled at the end of the support shaft 1, and the mounting base 12 has an installation groove 13 that is adapted to the limiting pin 15; the return spring 14 is coaxially fitted on the outside of the limiting pin 15, one end of the return spring 14 is connected to the outer wall of the limiting pin 15, and the other end is connected to the inner wall of the installation groove 13, forming an elastic return structure.

[0045] When the return spring 14 is in a natural extension and retraction state, at least part of the structure of the limiting pin 15 can extend to the inside of the port of the receiving cavity 9, thus blocking the receiving cavity 9. The operator can pull the limiting pin 15 with external force to overcome the elastic force of the return spring 14 and move it away from the receiving cavity 9 until the limiting pin 15 is completely removed from the area of ​​the receiving cavity 9.

[0046] In the actual operation process, the operator first needs to pull the limiting pin 15 to make it exit the range of the accommodating cavity 9, so as to provide insertion space for the drive shaft 3; then insert the drive shaft 3 along the accommodating cavity 9 until the drive shaft 3 is fully in the preset assembly position; at this time, the external force applied to the limiting pin 15 is removed, and the return spring 14 pushes the limiting pin 15 to reset under the action of elastic restoring force, so that the drive shaft 3 extends back to the inside of the port of the accommodating cavity 9 and forms abutment with the drive shaft 3, thereby limiting and constraining the drive shaft 3 within the accommodating cavity 9.

[0047] For example, an operating handle 5 is installed on the active drive shaft 3. When it is necessary to pull the active drive shaft 3 out of the receiving cavity 9 of the support shaft 1, the operator can apply axial pulling force by holding the operating handle 5, which effectively reduces the difficulty of applying force to pull out the active drive shaft 3 and improves the convenience of tooling assembly and disassembly.

[0048] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tool for sealing a spool groove face of a sliding valve, the tool comprising: include: A support shaft (1) is provided with a receiving cavity (9) along the axial direction. Receiving annular grooves (6) are provided on both sides of the support shaft (1). A guide channel (8) is provided in the receiving annular grooves (6). The guide channel (8) is connected to the receiving cavity (9). An abutting component is installed in the guide channel (8) and is capable of reciprocating along the extension direction of the guide channel (8). An expansion sealing ring (2) is fitted into the receiving ring groove (6) and is coupled to the abutment assembly; Active drive shaft (3), which is detachably installed in the accommodating cavity (9), is capable of driving the abutment assembly to move toward the expansion sealing ring (2).

2. The tooling for sealing the slot face of a sliding valve sleeve as set forth in claim 1, wherein, The accommodating annular groove (6) is provided with multiple guide channels (8) along the circumferential direction; Each of the multiple guide channels (8) is equipped with an abutment component, and each of the multiple abutment components is coupled to the expansion sealing ring (2).

3. The tooling for sealing the slot face of a sliding valve sleeve as set forth in claim 1 or 2, wherein, The abutting component includes a transmission slider (7), which slides and guides the guide channel (8). The transmission slider (7) has a guide slope (10) at one end facing the accommodating cavity (9), and the guide slope (10) can form a guiding fit with the drive shaft (3); When the active drive shaft (3) is inserted into the accommodating cavity (9), the active drive shaft (3) can drive the transmission slider (7) to move toward the expansion sealing ring (2), thereby causing the expansion sealing ring (2) to be squeezed and expand.

4. The tooling for sealing the slot face of a sliding valve sleeve as set forth in claim 3, wherein, An elastic sealing medium (11) is installed at the end of the guide channel (8) near the expansion sealing ring (2); The elastic sealing medium (11) can seal the gap between the guide channel (8) and the external environment, and the elastic sealing medium (11) can transmit the thrust of the transmission slider (7) to the expansion sealing ring (2).

5. The sealing fixture for the groove surface of a slide valve sleeve according to claim 4, characterized in that, A limit assembly (4) is installed at the end of the support shaft (1); The limiting component (4) can cooperate with the active drive shaft (3) to limit the active drive shaft (3) within the accommodating cavity (9).

6. The tooling for sealing the slot face of a sliding valve sleeve as set forth in claim 5, wherein, The limiting component (4) includes: Mounting base (12), which is mounted on the end of the support shaft (1), and the mounting base (12) is provided with mounting groove (13); A limiting pin (15) is provided in the mounting channel (13); A reset spring (14) is fitted on the outside of the limiting pin (15). One end of the reset spring (14) is connected to the outer wall of the limiting pin (15), and the other end of the reset spring (14) is connected to the inner wall of the mounting channel (13).

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