A sealing ring tensile strength detection tool

Abstract

The application discloses a sealing ring tensile strength detection tool, which comprises a base, a support frame, a driving assembly and a fixed part and a movable part. The support frame is arranged on the base and comprises the fixed part and the movable part. The fixed part is connected with the base, and the movable part is arranged opposite to the fixed part. The driving assembly is arranged on the base and connected with the movable part. The outer walls of the fixed part and the movable part are used for being closely combined with the inner walls of the sealing ring. When the driving assembly drives the movable part to move away from the fixed part along the axial direction, the sealing ring is deformed and stretched.

Description

Technical Field

[0001] This application relates to the field of object inspection, and more specifically to a tooling for testing the tensile strength of sealing rings. Background Technology

[0002] The sealing performance of sealing rings directly affects the operational reliability of equipment and is widely used in hydraulic, pneumatic, automotive, and construction machinery fields. Because sealing rings are typically made of elastic materials such as rubber and silicone, and their cross-sections are often complex structures like circles and rectangles, their production involves multiple processes including mixing, vulcanization, molding, and trimming. Due to factors such as material uniformity, mold precision, and trimming processes, some sealing rings may have hidden quality defects after production. The most typical of these is the "cutting phenomenon," which refers to tiny, non-penetrating scratches or cracks appearing on the inner or outer wall of the sealing ring. The incidence of this type of defect is approximately 5‰.

[0003] Because the cut defects are tiny and the sealing ring material has a certain degree of elasticity, the defects are naturally closed or hidden, making them difficult to identify effectively using traditional visual inspection and dimensional measurement methods. This means that sealing rings with cut defects cannot be intercepted before leaving the factory and end up at the customer's location. During customer installation, the sealing ring needs to be stretched axially to be assembled to the component to be sealed. At this time, stress concentration occurs at the cut location due to tensile deformation, making it very easy for it to break at the defect, leading to seal failure. Breakage during customer installation not only causes equipment assembly to stop and require rework, increasing the customer's production costs, but may also lead to safety hazards such as oil and gas leaks due to seal failure, seriously affecting product reputation and market trust.

[0004] Therefore, how to identify hidden cut defects before the sealing ring leaves the factory and prevent customers from receiving defective products has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a tooling for testing the tensile strength of sealing rings to identify hidden cut defects before the sealing rings leave the factory.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a tooling for testing the tensile strength of a sealing ring is provided, comprising: a base; a support frame, the support frame being disposed on the base, the support frame including a fixed member and a movable member, the fixed member being connected to the base, and the movable member being disposed opposite to the fixed member; a driving assembly, the driving assembly being disposed on the base and connected to the movable member; wherein, the outer walls of the fixed member and the movable member are respectively used to tightly fit against the two sides of the inner wall of the sealing ring, and when the driving assembly drives the movable member to move axially away from the fixed member, the sealing ring is deformed and stretched.

[0007] As a preferred embodiment, one end of the fixing member is connected to the side of the base, and the other end is connected to a sealing ring in conjunction with the moving member. When the sealing ring is stretched and deformed by the movement of the moving member, the fixing member is subjected to force on the base.

[0008] As another preferred embodiment, the movable component includes a horizontal section and a vertical section, the horizontal section and the vertical section are integrally formed, the vertical section is connected to a sealing ring, the horizontal section is used to fit against the base, and the horizontal section is externally connected to the drive assembly.

[0009] Further preferably, the support frame is provided with a limiting part, which is used to limit and engage the sealing ring.

[0010] Further preferably, the limiting part includes a first limiting part, which includes a first limiting slot and a second limiting slot; the first limiting slot is provided on the movable part, and the second limiting slot is provided on the fixed part. The first limiting slot and the second limiting slot are arranged opposite to each other, and the first limiting slot cooperates with the second limiting slot to achieve the embedding and engagement of the sealing ring.

[0011] Preferably, the limiting part further includes a second limiting part, which includes a first limiting protrusion and a second limiting protrusion; the movable part has a first limiting protrusion at a position higher than the first limiting slot along the vertical direction, and correspondingly, the fixed part has a second limiting protrusion at a position higher than the second limiting slot along the vertical direction, and the first limiting protrusion cooperates with the second limiting protrusion to limit the sealing ring in the vertical direction.

[0012] Preferably, the horizontal segment has extensions protruding to both sides of the vertical segment.

[0013] Preferably, both the first limiting groove and the second limiting groove have rounded corner structures at the positions where they contact the sealing ring.

[0014] Preferably, the movable end and the drive component, and / or the fixed end and the base are connected by quick-connect fittings.

[0015] Preferably, the sealing ring tensile strength testing fixture further includes a rangefinder, which is connected to the drive assembly to detect the extension distance of the drive assembly.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] The preferred drive component in the tooling provided in this application uses pneumatic drive to force the stretching of the sealing ring. Utilizing the amplification effect, it magnifies hidden defects such as tiny cuts and cracks. That is, when the sealing ring has a cut, under a tensile force far exceeding the actual installation strength, the cut will cause obvious tearing or breakage due to stress concentration, thus being quickly identified. Simultaneously, the outer walls of the fixed and moving parts are designed to fit against the inner wall of the sealing ring, eliminating the need for complex positioning and calibration steps during assembly. Operators simply need to naturally place the sealing ring between the fixed and moving parts, utilizing the dimensional compatibility between the two and the inner wall of the sealing ring to achieve a tight fit and positioning. This eliminates the need for cumbersome operations such as clamping position adjustment and force calibration, shortening the clamping time for a single product and improving the overall efficiency of batch testing, thus making the sealing ring inspection process simple and reliable. Attached Figure Description

[0018] Figure 1 A schematic diagram of a tooling assembly for testing the tensile strength of sealing rings;

[0019] Figure 2 A schematic diagram of the fixture for testing the tensile strength of sealing rings;

[0020] Figure 3 A side view of the structural schematic diagram of the tooling for testing the tensile strength of sealing rings;

[0021] Figure 4 A schematic diagram of the support frame position in the tooling for testing the tensile strength of the sealing ring;

[0022] Figure 5 A schematic diagram of a fixture for testing the tensile strength of a sealing ring, showing the structure in which the sealing ring is mounted on the support frame.

[0023] In the figure: 1. Fixture for testing the tensile strength of the sealing ring; 2. Sealing ring; 10. Base; 20. Support frame; 21. Fixture; 22. Movable part; 221. Horizontal section; 222. Vertical section; 223. Extension; 30. Drive assembly; 40. Limiting part; 41. First limiting part; 411. First limiting slot; 412. Second limiting slot; 42. Second limiting part; 421. First limiting protrusion; 422. Second limiting protrusion; 50. Rounded corner structure; 60. Rangefinder; 70. Quick connector. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] In a preferred embodiment, see Figures 1 to 5 This application provides a tooling 1 for testing the tensile strength of a sealing ring, comprising: a base 10; a support frame 20, which is disposed on the base 10 and includes a fixing member 21 and a movable member 22. The fixing member 21 is connected to the base 10, and the movable member 22 is disposed opposite to the fixing member 21; and a drive assembly 30, which is disposed on the base 10 and connected to the movable member 22. The outer walls of the fixing member 21 and the movable member 22 are respectively used to tightly fit against the inner walls of the sealing ring 2. When the drive assembly 30 drives the movable member 22 to move axially away from the fixing member 21, the sealing ring 2 is deformed and stretched.

[0029] In this application, the drive assembly 30 is preferably a cylinder structure, connected to the movable part 22 via a movable connecting rod. The movable part 22 is preferably a metal casting. Similarly, the fixing part 21 is also preferably a metal casting, and the fixing part 21 has a plate-like structure. After drilling and cutting, the movable part 22 is connected to the movable connecting rod of the cylinder. The fixing part 21 is connected to the base 10, and the base 10 provides a certain support for the movable part 22. The sealing ring 2 is preferably made of rubber and is fitted between the movable part 22 and the fixing part 21. Thus, by moving the movable part 22, the sealing ring 2 is pulled to produce tensile deformation, so as to visually observe whether there are any cuts or cracks in the sealing ring 2.

[0030] Among them, the sealing ring 2 is a ring structure. The tearing phenomenon of about 5‰ during the production of sealing ring 2 is a hidden defect that is difficult to be detected by conventional appearance inspection. Therefore, the preferred drive component 30 in the tooling provided in this application uses pneumatic drive to force the stretching of the sealing ring 2, and the extension length of the movable connecting rod is preferably set to 3 times the customer's installation stretching length. By utilizing the amplification effect, hidden defects such as small cuts and cracks are magnified. That is, when there is a cut in the sealing ring 2, under the action of tensile force far exceeding the actual installation strength, the cut will cause obvious tearing or breakage due to stress concentration, thus being quickly identified. At the same time, the outer wall of the fixed part 21 and the movable part 22 are set to fit the inner wall of the sealing ring 2. There is no need for complicated positioning and calibration steps during assembly. The operator only needs to naturally fit the sealing ring 2 between the fixed part 21 and the movable part 22. The tight fit and positioning can be achieved by utilizing the size fit between the two and the inner wall of the sealing ring 2. There is no need for cumbersome operations such as clamping position adjustment and force calibration, which shortens the clamping time of a single product and improves the overall efficiency of batch inspection. Thus, the sealing ring 2 inspection process is simple and reliable, intercepting products with hidden defects from the source, and effectively solving the quality risks of defective products flowing to the customer.

[0031] As a preferred embodiment, one end of the fixing member 21 is connected to the side of the base 10, and the other end is connected to the sealing ring 2 in conjunction with the moving member. When the sealing ring 2 is stretched and deformed by the movement of the moving member 22, the fixing member 21 is subjected to force on the base 10.

[0032] When the sealing ring 2 undergoes tensile deformation through the movement of the movable part 22, the tensile force is transmitted to the fixed part 21 through the sealing ring 2. If the connection of the fixed part 21 is unstable, it is easy to produce a slight deviation in the tensile direction or the vertical direction under continuous force. However, one end of the fixed part 21 is directly connected to the side of the base 10. Through the stop on the side of the base 10, the force of the fixed part 21 is directly applied to the base 10. With the stable support of the base 10, the reaction force during the tensile process is offset, ensuring that the fixed part 21 always stays on the preset axial center line. This avoids the fixed part 21 from tilting or slightly displacing in the tensile direction due to deviation. This ensures that the tensile action between the movable part 22 and the fixed part 21 is always carried out accurately in the axial direction, ensuring that the sealing ring 2 is subjected to uniform force in the circumferential direction, and allowing the test data to more accurately reflect the actual tensile strength of the sealing ring 2.

[0033] As another preferred embodiment, the movable component 22 includes a horizontal segment 221 and a vertical segment 222, which are integrally formed. The vertical segment 222 is connected to the sealing ring 2, and the horizontal segment 221 is used to fit against the base 10. The horizontal segment 221 is externally connected to the drive assembly 30. The horizontal segment 221 has extensions 223 protruding from both sides toward the vertical segment 222, which can be used to support, for example, small-sized sealing rings 2. Figure 5The sealing ring 2 shown is relatively large, and at this time it is only supported by the horizontal section 221 in the moving part 22.

[0034] In this design, the vertical segment 222 of the movable component 22 connects to the sealing ring 2, while the horizontal segment 221 serves to fit against the base 10 and connect to the drive assembly 30. This functional partitioning avoids direct contact between the drive assembly 30 and the sealing ring 2, reducing interference or collision risks to the sealing ring 2 during drive component movement. Simultaneously, the structure of the horizontal segment 221 fitting against the base 10 makes the movement of the movable component 22 smoother, reducing localized friction or uneven stress on the sealing ring 2 caused by the movement of the movable component 22 during tensioning. Especially when inspecting sealing rings 2 with hidden cut defects, this avoids non-detection damage caused by the instability of the movable component 22, ensuring that defects are only naturally exposed under tensile force, thus improving the accuracy of the inspection results.

[0035] Further preferably, the support frame 20 is provided with a limiting part 40, which is used to limit and engage the sealing ring 2. The setting of the limiting part 40 can effectively prevent the sealing ring 2 from falling out of the support frame 20.

[0036] In a further preferred embodiment, the limiting part 40 includes a first limiting part 41, which includes a first limiting slot 411 and a second limiting slot 412. The first limiting slot 411 is provided on the movable part 22, and the second limiting slot 412 is provided on the fixed part 21. The first limiting slot 411 and the second limiting slot 412 are arranged opposite to each other, and the first limiting slot 411 cooperates with the second limiting slot 412 to achieve the insertion and engagement of the sealing ring 2.

[0037] The first limiting slot 411 and the second limiting slot 412 have the same structure, and the height of the slots of the first limiting slot 411 and the second limiting slot 412 is greater than the thickness of the sealing ring 2, which makes it easy for the sealing ring 2 to move up and down within a certain distance in the slot, and has a certain amount of mobility. At the same time, it can also prevent the sealing ring 2 from falling off relative to the movable part 22 and the fixed part 21. For example, in a tensile test, due to different observation angles, the cut marks on the upper and lower surfaces of the sealing ring 2 are not easy to observe at one time. Therefore, it is preferable to perform two tensile tests in a tensile test. In the first tensile test, the part of the sealing ring 2 placed on the movable part 22 can be set against the extension 223 to complete the initial positioning. At this time, the upper surface of the sealing ring 2 is a certain distance away from the upper surfaces of the first limiting slot 411 and the second limiting slot 412, which is convenient for the operator to observe. After the first tensile test is completed, the sealing ring 2 is flipped and assembled onto the fixed part 21 and the movable part 22 to perform a second tensile test with the same operation as the first tensile test, so as to observe the cut marks on one side of the bottom of the sealing ring 2.

[0038] Therefore, the first limiting slot 411 and the second limiting slot 412 are arranged opposite to each other to form a locking space specifically for accommodating the sealing ring 2. When the sealing ring 2 is installed, its two side edges can be respectively embedded in the first limiting slot 411 of the movable part 22 and the second limiting slot 412 of the fixed part 21. The side walls of the slots form a circumferential constraint on the sealing ring 2, thereby accurately fixing the initial position of the sealing ring 2. This avoids the problem of the sealing ring 2 slipping or partially falling off along the axial direction due to the movement of the movable part 22 and the increase of tension during the stretching process. It ensures that the sealing ring 2 is always stretched within the preset stress area, providing a basic guarantee for the stability of the test data.

[0039] Preferably, the limiting part 40 further includes a second limiting part 42, which includes a first limiting protrusion 421 and a second limiting protrusion 422. The movable part 22 is provided with a first limiting protrusion 421 at a position higher than the first limiting slot 411 in the vertical direction. Correspondingly, the fixed part 21 is provided with a second limiting protrusion 422 at a position higher than the second limiting slot 412 in the vertical direction. The first limiting protrusion 421 cooperates with the second limiting protrusion 422 to limit the sealing ring 2 in the vertical direction.

[0040] The first limiting protrusion 421 and the second limiting protrusion 422 are preferably a triangular anti-detachment structure, which can cooperate with the first limiting part 41 to further prevent the sealing ring 2 from sliding upward in the vertical direction, so that the first limiting part 41 and the second limiting part 42 cooperate to form a multi-level limiting anti-detachment structure.

[0041] Preferably, both the first limiting groove 411 and the second limiting groove 412 are provided with rounded corner structures 50 at the contact positions with the sealing ring 2. The limiting grooves of the rounded corner structures 50 make the sealing ring 2 make curved surface contact with the moving part 22 and the fixed part 21. The sealing ring 2 is preferably made of elastic soft materials such as rubber and silicone. The rounded corner structures 50 transform the point-like or line-like hard contact into a surface-like flexible contact through the smooth transition of the curved surface, avoiding direct cutting or squeezing of the surface of the sealing ring 2 by sharp corners, ensuring that the sealing ring 2 remains in its original state before testing without additional damage or interference.

[0042] Preferably, the movable end is connected to the drive assembly 30, and / or the fixed end is connected to the base 10 via a quick-connect fitting 70.

[0043] The quick-connector 70 can be an internal hex nut. When the objects being tested are different, the quick-connector 70 can be screwed directly onto the base 10 or the drive assembly 30 using a hex wrench. When disassembling, the quick-connector 70 can be screwed out in the reverse direction using a hex wrench. For example, when testing the same specification of sealing ring 2 in batches, the stability of the quick-connect structure can reduce the wear and tear on components caused by frequent assembly and disassembly. When it is necessary to test different specifications of products, the quick-connect design can support a quick switching mode of immediate replacement and testing without interrupting the overall testing process for complex adjustments.

[0044] Preferably, the sealing ring tensile strength testing fixture 1 also includes a rangefinder 60, which is connected to the drive assembly 30 to detect the extension distance of the drive assembly 30. The rangefinder 60 has a connection port on its top for connecting to an external terminal device for control. Specifically, the rangefinder 60 can monitor the extension distance of the drive assembly 30 in real time, thereby indirectly reflecting the tensile length of the sealing ring 2. This effectively improves the control accuracy of the tensile length of the sealing ring 2, strictly ensuring that the tensile amount of each test accurately meets the preset standard, avoiding the failure to expose hidden defects due to insufficient tensile strength, or the invalid loss of the sample due to excessive tensile strength, thus ensuring the consistency and comparability of the test results.

[0045] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A fixture for testing the tensile strength of a sealing ring, characterized in that, include: Base; A support frame is provided on the base. The support frame includes a fixed component and a movable component. The fixed component is connected to the base, and the movable component is arranged facing the fixed component. A drive assembly, which is disposed on the base and connected to the movable component; The outer walls of the fixed member and the movable member are respectively used to fit tightly against the inner walls of the sealing ring. When the driving assembly drives the movable member to move away from the fixed member along the axial direction, it causes the sealing ring to deform and stretch.

2. The tooling for testing the tensile strength of the sealing ring as described in claim 1, characterized in that, One end of the fixing member is connected to the side of the base, and the other end is connected to the sealing ring in conjunction with the moving member. When the sealing ring is stretched and deformed by the movement of the moving member, the fixing member is subjected to force on the base.

3. The tooling for testing the tensile strength of the sealing ring as described in claim 1, characterized in that, The movable component includes a horizontal section and a vertical section, which are integrally formed. The vertical section is connected to a sealing ring, and the horizontal section is used to fit against the base and is externally connected to the drive assembly.

4. The tooling for testing the tensile strength of the sealing ring as described in claim 1, characterized in that, The support frame is provided with a limiting part, which is used to limit and engage the sealing ring.

5. The tooling for testing the tensile strength of the sealing ring as described in claim 4, characterized in that, The limiting part includes a first limiting part, which includes a first limiting slot and a second limiting slot; The first limiting slot is provided on the movable part, and the second limiting slot is provided on the fixed part. The first limiting slot and the second limiting slot are arranged opposite to each other. The first limiting slot cooperates with the second limiting slot to achieve the embedding and engagement of the sealing ring.

6. The tooling for testing the tensile strength of the sealing ring as described in claim 5, characterized in that, The limiting part further includes a second limiting part, which includes a first limiting protrusion and a second limiting protrusion; The movable part has a first limiting protrusion at a position higher than the first limiting slot along the vertical direction. Correspondingly, the fixed part has a second limiting protrusion at a position higher than the second limiting slot along the vertical direction. The first limiting protrusion cooperates with the second limiting protrusion to limit the sealing ring in the vertical direction.

7. The tooling for testing the tensile strength of the sealing ring as described in claim 3, characterized in that, The horizontal segment has extensions protruding from both sides of the vertical segment.

8. The tooling for testing the tensile strength of the sealing ring as described in claim 5, characterized in that... Both the first and second limiting slots have rounded corners at the points where they contact the sealing ring.

9. The tooling for testing the tensile strength of a sealing ring as described in any one of claims 1-8, characterized in that, The movable end and the driving component, and the fixed end and the base are connected by quick-connect fittings.

10. The tooling for testing the tensile strength of a sealing ring as described in any one of claims 1-8, characterized in that, Also includes: A rangefinder, connected to the drive assembly, is used to detect the extension distance of the drive assembly.

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