A device and method for testing the tensile properties of sealing rings

Abstract

This invention relates to the technical field of performance measurement using sensors, and discloses a device and method for measuring the tensile properties of sealing rings. The device includes a top support plate supported by legs, and further includes: an inner support assembly, which consists of multiple circumferentially distributed arc-shaped support plates and inner support strips integrally formed with the arc-shaped support plates, wherein the inner support strips are slidably installed in corresponding edge grooves of the top support plate; and a driving component for driving the multiple inner support strips to perform circumferential equal-amplitude expansion movement. This invention solves the problems of uneven tensile strength, data offset, and poor repeatability caused by uneven contact and friction differences in traditional methods through circumferential equal-amplitude expansion-free springback, multi-point rapid pressure sensing, and intermittent switching mechanism. It achieves synchronous quantification of springback speed and permanent deformation, and evaluates uniformity through consistent sampling at multiple circumferential positions, significantly improving the accuracy, repeatability, and efficiency of sealing ring tensile performance testing.

Description

Technical Field

[0001] This invention relates to the technical field of measuring performance using sensors, specifically to a device and method for measuring the tensile properties of sealing rings. Background Technology

[0002] Rubber seals are widely used for sealing and protection in rotating or reciprocating applications. Their service reliability is closely related to the mechanical properties of the material, such as tensile strength, resilience / restoration ability, and fatigue resistance. Existing tests are mostly conducted using tensile testing machines with upper and lower rollers to record specified elongation loads, breaking loads, and elongation. However, it is difficult to simulate the stress state of the seal in the "suited state," and there are differences between the test conditions and actual service (existing literature has already summarized this phenomenon). Against this background, testing equipment has emerged that approximates the suited state through "circumferential expansion."

[0003] For example, Chinese patent CN116106126B discloses a testing device for determining the tensile properties of sealing rings. This testing device has a "horizontal tension mechanism" and a "circumferential tension mechanism" (similar to iris expansion) set on the base and the mounting base. The circumferential tension mechanism consists of a mounting frame, several guide rods / guide grooves and a sliding support assembly. An inclined slide is set on the drive plate to drive the support assembly to expand radially outward, and a pressure / displacement sensor is arranged at the support plate to record event points such as straightening, fixed elongation and fracture, so as to calculate the tensile strength.

[0004] However, this measurement method still has the following shortcomings in terms of measurement consistency, specifically:

[0005] Non-uniform contact leads to strain deviation; before expansion, multiple arc-shaped support plates approximately form a circle and are in continuous contact with the inner ring of the sealing ring; during expansion, the adjacent support plates gradually open to form gaps, and the inner ring of the sealing ring changes from "full circumferential contact" to "partial contact + partial gaps". In the presence of friction, the local strain and tangential slippage of the contact area and the area adjacent to the gap may be different, which can easily introduce uneven tension, measurement offset and reduced repeatability, and thus lead to errors in the final test results. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for measuring the tensile properties of sealing rings, so as to solve at least one technical problem existing in the prior art.

[0007] To achieve the above objectives, the first aspect of the present invention provides the following technical solution: a device for measuring the tensile properties of a sealing ring, comprising a top support plate supported by support legs, and further comprising:

[0008] The inner support assembly consists of a plurality of circumferentially distributed arc-shaped support plates and an inner support strip integrally formed with the arc-shaped support plates, and the inner support strip is slidably installed in the corresponding edge groove of the top support plate.

[0009] The driving component is used to drive multiple inner support bars to expand and move in a circumferential manner with equal amplitude, and after expanding to a threshold level, it disconnects from the inner support bars and puts the inner support bars in a free state.

[0010] The sensing component is used to collect speed data of the inner support bar during the restoration process and pressure values ​​of the sealing ring on the arc support plate before and after restoration.

[0011] The switching assembly includes a switching wheel disposed within an arc-shaped support plate. The switching wheel is rotatable and can slide and adjust along the direction of the inner support bar. During the stretching phase, the switching wheel remains internally tangent to the outer arc surface of the arc-shaped support plate. During the switching phase, the switching wheel extends outward and rotates, causing a relative displacement between the sealing ring and the outer arc surface of the arc-shaped support plate.

[0012] Optionally, the switching assembly includes a sliding groove inside the inner support bar and a movable groove on the outer arc surface of the arc-shaped support plate. A sliding bar is slidably installed in the sliding groove. The switching wheel is rotatably installed in the bearing seat where the sliding bar extends into the movable groove. Each switching wheel is coaxially fixed with a transmission wheel, and the transmission wheels are connected by a synchronous belt that can be elastically stretched.

[0013] The switching component also includes a drive unit for driving multiple sliders to perform centripetal or centrifugal motion together.

[0014] Optionally, the drive unit includes a vertical rod fixed to the top center of the top support plate. The outer wall of the vertical rod is fitted with a splined sleeve that can rotate intermittently, and the bottom end of the splined sleeve is rotatably mounted on the top of the top support plate. The top end of the splined sleeve is fixed with an upper rotating sleeve fitted on the outer wall of the vertical rod. A first tension spring is connected between the upper rotating sleeve and the rotating ring at the top end of the vertical rod. A collar is rotatably mounted on the outer wall of the upper rotating sleeve. A telescopic rod is rotatably connected between each slide bar and the collar. A first wave groove is formed on the inner wall of the upper rotating sleeve. A first pin is fixed on the outer wall of the vertical rod and slidably mounted in the first wave groove. The first wave groove is composed of multiple sets of V-shaped grooves connected end to end, and the V-shaped groove includes inclined grooves and vertical grooves. The splined sleeve is connected to one of the switching wheels by an elastic transmission belt.

[0015] Optionally, the driving component includes a flat plate fixed to the outer wall of the support leg, and a rotatable rotating shaft is installed between the flat plate and the center bottom of the top support plate. A lifting ring is sleeved on the outer wall of the rotating shaft. A connecting rod is rotatably connected between the lifting ring and the bottom of each inner support bar. A fixing tube is fixed to the top of the flat plate, and a lower sleeve sleeved on the rotating shaft is vertically slidably installed inside the fixing tube. A second tension spring is connected between the lower sleeve and the flat plate. A second wave groove is opened on the inner wall of the lower sleeve. A second pin is fixed to the outer wall of the rotating shaft and slidably installed in the second wave groove. The second wave groove is composed of a horizontal groove, an oblique groove, and a vertical groove connected end to end.

[0016] Optionally, the drive unit includes a drive shaft that is rotatably mounted inside the top support plate, and the drive shaft is driven by a servo motor mounted at the bottom of the top support plate. An intermittent transmission assembly is provided between the top end of the drive shaft and the spline sleeve, and a meshing gear is fixed between the bottom end of the drive shaft and the outer wall of the rotating shaft.

[0017] Optionally, the intermittent transmission assembly includes a disc and a notched disc coaxially fixed to the top of the drive shaft, and a pin is fixed to the top of the disc at the notch position of the notched disc. A driven disc is fixed to the outer wall of the spline sleeve. The outer wall of the driven disc has multiple annularly distributed grooves, and the pin can rotate into the grooves and rotate the driven disc. An arc-shaped groove is provided between adjacent grooves so that the notched disc can rotate into and lock.

[0018] Optionally, the sensing assembly includes multiple sets of speed sensors fixed to the top of the top support plate, with each speed sensor corresponding to one of the inner support bars, and also includes a pressure sensor mounted on the slide bar for monitoring the force intensity of the switching wheel.

[0019] Optionally, when multiple arc-shaped support plates are in the state of circular support surface, the telescopic rod is in its shortest state.

[0020] Optionally, the inner support bar and the edge groove of the top support plate are connected by ball bearings.

[0021] In a second aspect, the present invention provides the following technical solution: a method for determining the tensile properties of a sealing ring, comprising the following steps using a sealing ring tensile property testing device:

[0022] S1. Installation and alignment: The sealing ring to be tested is placed on the support surface formed by the outer arc surface of multiple arc-shaped support plates, so that each inner support bar is in the initial position, and the switching wheel is in an internally tangent state with the outer arc surface;

[0023] S2, Tensile loading: The driving component simultaneously drives multiple inner support bars to expand outward in a circumferential manner along the edge groove of the top support plate until a preset threshold is reached, thereby stretching the sealing ring circumferentially.

[0024] S3, Tripping and Restoration: After reaching the threshold, the drive component disconnects from each inner support bar, allowing each inner support bar to be in a free state and to restore inward under the elastic action of the sealing ring. The sensing component collects the speed data of each inner support bar during the restoration process.

[0025] S4. Pressure Measurement: Before and after restoration, the pressure values ​​of the sealing ring on the arc-shaped support plate are obtained through the sensing component and the change is calculated.

[0026] S5. Contact position switching: The switching component controls the switching wheel to extend and rotate outward along the direction of the inner support bar, so that the sealing ring and multiple switching wheels form a transmission, and the sealing ring is displaced relative to the outer arc surface of the arc support plate at a predetermined angle. Then the switching wheel is reset to the state of being tangent to the outer arc surface.

[0027] S6. Cycling and Evaluation: Repeat S2 to S5 at least once. Based on the speed data and pressure change of each cycle, determine the resilience of the sealing ring and whether there is permanent deformation. Use the consistency of the results obtained at different contact positions as the evaluation basis for tensile uniformity.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] I. This invention employs a testing mechanism of "intermittent expansion + free rebound + multi-point speed / pressure sensing." First, the driving component synchronously expands the arc-shaped support plate to a set threshold and then instantly "disengages." Under pure elasticity, the sealing ring drives the inner support strip to rebound freely. Simultaneously, a speed sensor records the rebound speed, and a pressure sensor records the change in the sealing ring's pressure on the support plate before and after rebound. This allows for both quantifying the rebound speed to evaluate elastic recovery capability and directly determining the amount of permanent deformation through pressure attenuation. A single test can simultaneously obtain two core indicators: "rebound performance" and "residual deformation," eliminating the need for additional displacement gauges or manual measurement, significantly improving testing efficiency and data objectivity.

[0030] II. This invention, by setting a retractable and rotatable switching wheel inside the arc-shaped support plate, after each stretching-rebound cycle, pushes the sealing ring away from the surface of the support plate and rotates it by a predetermined angle, then resets it for the next round of testing, so that the "fitting-gap" position between the sealing ring and the support plate is continuously offset in the circumferential direction; thus, it transforms single-point measurement into cyclic sampling of multiple circumferential positions, and uses the consistency of the rebound speed and pressure change in each cycle as the criterion for tensile uniformity, effectively eliminating test deviations caused by local friction, uneven wall thickness, or notch defects, significantly reducing measurement error offset, and improving the repeatability and accuracy of the results.

[0031] Third, this invention integrates the three major actions of "expansion drive - tripping - switching" into the same servo motor - waveform groove - intermittent dial mechanism: when the motor rotates forward once, the second waveform groove first completes the expansion and tripping, and the notched disc then unlocks and moves the dial, causing the spline sleeve to drive the switching wheel to complete the displacement of the sealing ring, and then locks it again; the whole process is automatically completed in the same direction of rotation without stopping the motor, realizing integrated detection and switching, and greatly shortening the testing cycle of batch sealing rings. Attached Figure Description

[0032] Figure 1 This is a top perspective view of the present invention;

[0033] Figure 2 This is a bottom-view perspective view of the present invention;

[0034] Figure 3 This is the front view of the present invention;

[0035] Figure 4 For the present invention Figure 3 A sectional view along the middle AA;

[0036] Figure 5 For the present invention Figure 4 A sectional stereoscopic view from a specific perspective;

[0037] Figure 6 For the present invention Figure 3 A sectional view along the middle edge BB;

[0038] Figure 7 This is an exploded perspective view of the vertical rod, upper rotating sleeve, and spline sleeve of the present invention.

[0039] Figure 8 This is an exploded perspective view of the rotating shaft and lower sleeve of the present invention.

[0040] In the diagram: 1. Top support plate; 2. Support leg; 3. Inner support bar; 4. Arc-shaped support plate; 5. Sliding bar; 6. Switching wheel; 7. Transmission wheel; 8. Synchronous belt; 9. Speed ​​sensor; 10. Pressure sensor; 11. Vertical rod; 12. Upper rotating sleeve; 13. First tension spring; 14. Collar; 15. Telescopic rod; 16. Passive disc; 17. Disc; 18. Notched disc; 19. Pin; 20. Slot; 21. Arc-shaped groove; 22. Spline sleeve; 23. Drive shaft; 24. Rotating shaft; 25. Gear; 26. Lifting ring; 27. Connecting rod; 28. Lower sleeve; 29. ​​Second tension spring; 30. Flat plate; 31. First wave groove; 32. First pin; 33. Second wave groove; 34. Second pin; 35. Sealing ring. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 8 The present invention provides a technical solution: a device for measuring the tensile properties of a sealing ring, comprising a top support plate 1 supported by a support leg 2, and further comprising:

[0043] The inner support assembly consists of multiple circumferentially distributed arc-shaped support plates 4 and an inner support strip 3 integrally formed with the arc-shaped support plates 4, and the inner support strip 3 is slidably installed in the corresponding edge groove of the top support plate 1.

[0044] The driving component is used to drive multiple inner support bars 3 to expand and move in a circumferential manner with equal amplitude, and after expanding to a threshold level, disconnecting from the inner support bars 3 and putting the inner support bars 3 in a free state.

[0045] The sensing component is used to collect the speed data of the inner support bar 3 during the restoration process and the pressure values ​​of the sealing ring 35 on the arc support plate 4 before and after restoration.

[0046] The switching assembly includes a switching wheel 6 located inside the arc-shaped support plate 4. The switching wheel 6 can rotate and slide along the inner support bar 3 for adjustment. During the stretching stage, the switching wheel 6 is in an in-circle tangent state with the outer arc surface of the arc-shaped support plate 4. During the switching stage, the switching wheel 6 extends outward and rotates, causing the sealing ring 35 to generate relative displacement between it and the outer arc surface of the arc-shaped support plate 4.

[0047] When using this measuring device, firstly, the sealing ring 35 to be tested is placed on the support surface formed by the outer arc surfaces of multiple arc-shaped support plates 4, so that each inner support bar 3 is in its initial position, and the switching wheel 6 is tangent to the outer arc surface. Figure 1 The state shown;

[0048] It is worth mentioning that in this state, the sealing ring 35 has a certain degree of deformation, that is, under its own elasticity, it exerts a certain pressure on the arc-shaped support plate 4 and the switching wheel 6. In this way, it can have an initial pressure value, so as to compare it with the pressure value detected later.

[0049] After loading, the driving component simultaneously drives multiple inner support bars 3 to expand outward in a circumferential manner along the edge groove of the top support plate 1 until a preset threshold is reached, which stretches the sealing ring 35 circumferentially. After reaching the threshold, the driving component disconnects from each inner support bar 3, allowing each inner support bar 3 to be in a free state and to recover inward under the elastic action of the sealing ring 35. At the same time, the sensing component collects the speed data of each inner support bar 3 and the pressure value of the sealing ring 35 on the arc support plate 4 after recovery during the recovery process and calculates its change.

[0050] In this way, the speed data of the inner support bar 3 can reflect the resilience of the sealing ring 35. By comparing the pressure values ​​of the sealing ring 35 before and after the arc support plate 4, it can be determined whether the sealing ring 35 has undergone permanent deformation. Then, the tensile properties of the sealing ring can be measured by comprehensive data.

[0051] During the expansion process, the adjacent arc-shaped support plates 4 will gradually open to form a gap, and the inner ring of the sealing ring 35 will change from "full circumferential fit" to "partial fit + partial gap". Under the condition of friction, the local strain and tangential slippage of the contact area and the area adjacent to the gap may be different, which can easily lead to uneven tension, measurement deviation and reduced repeatability.

[0052] Therefore, after completing one test: the switching component controls the switching wheel 6 to extend and rotate outward along the inner support bar 3, so that the sealing ring 35 and multiple switching wheels 6 form a transmission, and the sealing ring 35 is displaced relative to the outer arc surface of the arc support plate 4 at a predetermined angle. Then the switching wheel 6 is reset to the state of being tangent to the outer arc surface. In this way, when the inner support bar 3 and the arc support plate 4 are opened again, the sealing ring 35 can be offset from the gap position, and the test result can be obtained again.

[0053] By repeating the stretching-recovery cycle several times, we can not only simulate repeated loading in actual use and evaluate the resilience and fatigue resistance of the sealing ring, but also determine the resilience and whether there is permanent deformation of the sealing ring 35 based on the speed data and pressure change of each cycle. The consistency of the results obtained at different contact positions is used as the evaluation basis for the uniformity of stretching, thereby reducing the error deviation of the measurement results and improving the accuracy of the test results.

[0054] In one preferred embodiment, an implementation of the switching component is provided;

[0055] The switching assembly includes a sliding groove inside the inner support bar 3 and a movable groove on the outer arc surface of the arc-shaped support plate 4. A sliding bar 5 is slidably installed in the sliding groove. The switching wheel 6 is rotatably installed in the bearing seat of the sliding bar 5 extending into the movable groove. Each switching wheel 6 is coaxially fixed with a transmission wheel 7, and the transmission wheels 7 are connected to each other by a synchronous belt 8 that can be elastically stretched.

[0056] The switching assembly also includes a drive unit for driving multiple sliders 5 to perform centripetal or centrifugal motion together.

[0057] For details on switching components, please refer to [link / reference]. Figure 1 During the switching process, the drive unit first drives multiple sliders 5 to perform centrifugal motion synchronously. Then, the switching wheel 6 supports the sealing ring 35 and changes it from a circle to a regular polygon. Then, under the drive of the external structure, the switching wheel 6 rotates, and under the transmission of the transmission wheel 7 and the elastically stretchable synchronous belt 8, all the switching wheels 6 rotate together, which drives the sealing ring 35 in the form of a transmission belt. This causes the sealing ring 35 to shift relative to the arc-shaped support plate 4, thus completing the process of switching the position of the sealing ring 35.

[0058] Then the drive unit drives the slider 5 to perform centripetal motion to reset it. In this way, a switch is performed after each internal support structure test. The consistency of multiple test results is used as the evaluation criterion for tensile uniformity to improve the accuracy of the test results.

[0059] In one preferred embodiment, an implementation of the drive unit is provided;

[0060] The drive unit includes a vertical rod 11 fixed to the top center of the top support plate 1. A splined sleeve 22 capable of intermittent rotation is fitted on the outer wall of the vertical rod 11, and the bottom end of the splined sleeve 22 is rotatably mounted on the top of the top support plate 1. An upper rotating sleeve 12 fitted on the outer wall of the vertical rod 11 is fixed to the top end of the splined sleeve 22. A first tension spring 13 is connected between the upper rotating sleeve 12 and the rotating ring at the top end of the vertical rod 11. A collar 14 is rotatably mounted on the outer wall of the upper rotating sleeve 12. A telescopic rod 15 is rotatably connected between each slide bar 5 and the collar 14. A first wave groove 31 is opened on the inner wall of the upper rotating sleeve 12. A first pin 32 slidably mounted in the first wave groove 31 is fixed on the outer wall of the vertical rod 11. The first wave groove 31 is composed of multiple sets of V-shaped grooves connected end to end, and the V-shaped grooves include inclined grooves and vertical grooves. The splined sleeve 22 is connected to one of the switching wheels 6 by an elastic transmission belt.

[0061] For details, please refer to [link / reference]. Figure 4 , Figure 5 and Figure 7 During switching, the spline sleeve 22 is driven to rotate by the external drive structure, and then the spline sleeve 22 drives the upper rotating sleeve 12 to rotate, so that the first pin 32 slides relative to the first wave groove 31, that is, the first pin 32 will slide in the inclined groove of the V-shaped groove. At the same time, under the action of the reaction force, the upper rotating sleeve 12 will slide downward while rotating, and the collar 14 will also slide downward. The telescopic rod 15 pushes the slide bar 5 to move outward to complete the centrifugal motion process.

[0062] Then, when the first pin 32 slides to the end of the inclined groove, that is, into the vertical groove, the spline sleeve 22 and the upper rotating sleeve 12 stop rotating. At this time, the upper rotating sleeve 12 moves upward and resets under the pulling force of the first tension spring 13, thereby causing the telescopic rod 15 to also reset. Subsequently, the switching wheel 6 also resets under the elastic recovery of the sealing ring 35, completing one switching process.

[0063] In this way, by intermittently driving the spline sleeve 22 to rotate, the purpose of switching the sealing ring 35 can be achieved after one test is completed.

[0064] It is worth mentioning that, firstly, when multiple arc-shaped support plates 4 are in the state of circular support surface, the telescopic rod 15 is in the shortest state. At this time, the collar 14 moves down with the upper rotating sleeve 12, so that the telescopic rod 15 can push the slide bar 5. During the detection stage, the expansion of the inner support bar 3 will drive the slide bar 5 to move together, and the telescopic rod 15 can adaptively adjust the length between the slide bar 5 and the collar 14 to avoid the problem of stroke interference.

[0065] Secondly, the spline sleeve 22 is divided into two sections, namely the inner tube and the sleeve. One end of the inner tube is rotatably mounted on the top support plate 1, while the other end of the sleeve is fixed to the upper rotating sleeve 12. This can serve as a transmission function while allowing it to be adjusted in the axial direction.

[0066] In one preferred embodiment, an implementation of the driving component is provided;

[0067] The driving component includes a flat plate 30 fixed to the outer wall of the support leg 2, and a rotating shaft 24 that can rotate is installed between the flat plate 30 and the center bottom of the top support plate 1. A lifting ring 26 is sleeved on the outer wall of the rotating shaft 24. A connecting rod 27 is rotatably connected between the lifting ring 26 and the bottom of each inner support bar 3. A fixing tube is fixed to the top of the flat plate 30, and a lower sleeve 28 sleeved on the rotating shaft 24 is vertically slidably installed inside the fixing tube. A second tension spring 29 is connected between the lower sleeve 28 and the flat plate 30. A second wave groove 33 is opened on the inner wall of the lower sleeve 28. A second pin 34 is fixed to the outer wall of the rotating shaft 24 and slidably installed in the second wave groove 33. The second wave groove 33 is composed of a horizontal groove, an oblique groove and a vertical groove connected end to end.

[0068] For details, please refer to [link / reference]. Figure 4 , Figure 5 and Figure 8During the detection, the rotating shaft 24 is driven to rotate by an external drive structure. Then, the second pin 34 on the outer wall of the rotating shaft 24 slides along the inclined groove of the second wave groove 33, and drives the lower sleeve 28 to move upward. At the same time, it pushes the lifting ring 26 to move upward. Under the connection of the connecting rod 27, it drives the inner support bar 3 to expand and slide, completing the above-mentioned equal expansion. Then, when the second pin 34 slides into the vertical groove, the lower sleeve 28 moves downward and resets under the tension of the second tension spring 29, thereby canceling the supporting force on the lifting ring 26. That is, after expanding to the threshold level, the connection with the inner support bar 3 is released, and the inner support bar 3 is in a free state. At this time, the elastic force of the sealing ring 35 can be used to drive the inner support bar 3 to reset, and the detection process is completed by the sensing component.

[0069] In this way, the rebound performance test can be completed by supporting and removing the lifting ring 26 through the lower sleeve 28.

[0070] It is also worth mentioning that the height of the sloping groove corresponds to the limit threshold, and the threshold range can be adjusted by changing the height of the sloping groove, thereby enabling a wider detection range.

[0071] In one preferred embodiment, an implementation of the drive unit is provided;

[0072] The drive unit includes a drive shaft 23 that is rotatably mounted inside the top support plate 1. The drive shaft 23 is driven by a servo motor mounted at the bottom of the top support plate 1. An intermittent transmission assembly is provided between the top end of the drive shaft 23 and the spline sleeve 22. A meshing gear 25 is fixed between the bottom end of the drive shaft 23 and the outer wall of the rotating shaft 24.

[0073] For details, please refer to [link / reference]. Figure 4 and Figure 5 The servo motor drives the drive shaft 23 to rotate, and the gear 25 drives the rotating shaft 24 to rotate, thereby achieving the purpose of equal expansion of the inner support bar 3 and the arc support plate 4. At the same time, the drive shaft 23 can drive the switching of the above-mentioned switching components through the intermittent transmission component.

[0074] Furthermore, as can be seen from the above, the second wave groove 33 is composed of a horizontal groove, an inclined groove, and a vertical groove connected end to end. Therefore, when the second pin 34 slides in the horizontal groove stage, it is equivalent to a pause between two detection processes. During this process, the intermittent transmission component can drive the switching component to complete the switching of the sealing ring 35. This not only saves time but also integrates detection and switching into one design, shortening the detection time.

[0075] In one preferred embodiment, an implementation of an intermittent transmission component is provided;

[0076] The intermittent transmission assembly includes a disc 17 and a notched disc 18 coaxially fixed to the top of the drive shaft 23. A pin 19 is fixed to the top of the disc 17 located at the notch position of the notched disc 18. A driven disc 16 is fixed to the outer wall of the spline sleeve 22. The outer wall of the driven disc 16 has multiple annularly distributed grooves 20. The pin 19 can rotate into the grooves 20 and rotate the driven disc 16. An arc-shaped groove 21 is provided between adjacent grooves 20 so that the notched disc 18 can rotate into and lock.

[0077] For details, please refer to [link / reference]. Figure 6 and Figure 7 When the drive shaft 23 rotates, it will drive the disc 17 and the notched disc 18 to rotate together. During the detection stage, the arc surface of the notched disc 18 will rotate into the arc groove 21 to restrict the rotation of the passive disc 16 and play a locking role.

[0078] During the switching phase, the notched disc 18 rotates to disengage from the arc-shaped groove 21, while the pin 19 on the disc 17 rotates into the groove 20 and drives the driven disc 16 to rotate, thereby driving the spline sleeve 22 to rotate, completing the switching process of the sealing ring 35. Subsequently, the notched disc 18 rotates back into the arc-shaped groove 21 to complete the locking.

[0079] In this way, the switching of the sealing ring 35 can be completed during the gap in the detection process on both sides, combining detection and switching to improve detection efficiency.

[0080] In one preferred embodiment, the sensing component includes multiple speed sensors 9 fixed to the top of the top support plate 1, with each speed sensor 9 corresponding to one of the inner support bars 3, and also includes a pressure sensor 10 mounted on the slide bar 5 for monitoring the force intensity of the switching wheel 6.

[0081] For sensor components, please refer to Figure 1 and Figure 2 The moving speed of the inner support bar 3 is detected by a speed sensor 9, preferably a non-contact laser speed measurement module, so as to avoid affecting or causing errors in the rebound speed of the inner support bar 3.

[0082] The pressure sensor 10 is used to monitor the force intensity of the switching wheel 6, thereby determining whether the pressure data has changed. The two are combined to make an overall evaluation of the tensile properties of the sealing ring 35.

[0083] In one preferred embodiment, the inner support bar 3 and the edge groove of the top support plate 1 are connected by ball bearings.

[0084] By using ball bearings for installation, the friction between the inner support strip 3 and the edge groove can be further reduced, thereby further avoiding the influence of external factors on the rebound speed of the inner support strip 3 (i.e., the rebound speed of the sealing ring 35).

[0085] A method for determining the tensile properties of a sealing ring, using a sealing ring tensile property testing device, includes the following steps:

[0086] S1. Installation and alignment: The sealing ring 35 to be tested is fitted onto the support surface formed by the outer arc surface of multiple arc-shaped support plates 4, so that each inner support bar 3 is in the initial position, and the switching wheel 6 is in an in-tangent state with the outer arc surface;

[0087] S2, Tensile loading: The driving component simultaneously drives multiple inner support bars 3 to expand outward in a circumferential manner along the edge groove of the top support plate 1 until a preset threshold is reached, thereby stretching the sealing ring 35 circumferentially.

[0088] S3, Tripping and Restoration: After the threshold is reached, the drive component disconnects from each inner support bar 3, so that each inner support bar 3 is in a free state and restores itself inward under the elastic action of the sealing ring 35. The sensing component collects the speed data of each inner support bar 3 during the restoration process.

[0089] S4. Pressure measurement: Before and after restoration, the pressure values ​​of the sealing ring 35 on the arc support plate 4 are obtained by the sensing component and the change is calculated.

[0090] S5. Contact position switching: The switching wheel 6 is controlled to extend and rotate outward along the inner support bar 3 by the switching component, so that the sealing ring 35 and multiple switching wheels 6 form a transmission, and the sealing ring 35 is displaced relative to the outer arc surface of the arc support plate 4 at a predetermined angle. Then the switching wheel 6 is reset to the state of being tangent to the outer arc surface.

[0091] S6. Cycling and Evaluation: Repeat S2 to S5 at least once. Based on the speed data and pressure change of each cycle, determine the resilience of the sealing ring 35 and whether there is permanent deformation. Use the consistency of the results obtained at different contact positions as the evaluation basis for tensile uniformity.

[0092] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the tensile properties of a sealing ring, comprising a top support plate (1) supported by a support leg (2), characterized in that, Also includes: The inner support assembly consists of a plurality of circumferentially distributed arc-shaped support plates (4) and an inner support strip (3) integrally formed with the arc-shaped support plates (4), and the inner support strip (3) is slidably installed in the corresponding edge groove of the top support plate (1). The driving component is used to drive multiple inner support bars (3) to expand and move in a circumferential manner, and after expanding to a threshold level, it disconnects from the inner support bars (3) and puts the inner support bars (3) in a free state. The sensing component is used to collect the speed data of the inner support bar (3) during the restoration process and the pressure values ​​of the sealing ring (35) on the arc support plate (4) before and after restoration; The switching assembly includes a switching wheel (6) disposed within the arc-shaped support plate (4), and the switching wheel (6) is rotatable and can slide along the direction of the inner support bar (3) for adjustment. During the stretching phase, the switching wheel (6) and the outer arc surface of the arc support plate (4) remain in an in-circle state; during the switching phase, the switching wheel (6) extends outward and rotates, causing the sealing ring (35) and the outer arc surface of the arc support plate (4) to generate relative displacement. The switching assembly includes a groove inside the inner support bar (3) and a movable groove on the outer arc surface of the arc-shaped support plate (4). A slide bar (5) is slidably installed in the groove. The switching wheel (6) is rotatably installed in the bearing seat of the slide bar (5) extending into the movable groove. Each switching wheel (6) is coaxially fixed with a transmission wheel (7), and the transmission wheels (7) are connected to each other by a synchronous belt (8) that can be elastically stretched. The switching assembly also includes a drive unit for driving multiple slide bars (5) to perform centripetal or centrifugal motion together. The driving unit includes a vertical rod (11) fixed to the top center of the top support plate (1). The outer wall of the vertical rod (11) is fitted with a splined sleeve (22) that can rotate intermittently. The bottom end of the splined sleeve (22) is rotatably mounted on the top of the top support plate (1). The top end of the splined sleeve (22) is fixed with an upper rotating sleeve (12) fitted on the outer wall of the vertical rod (11). A first tension spring (13) is also connected between the upper rotating sleeve (12) and the rotating ring at the top end of the vertical rod (11). The outer wall of the upper rotating sleeve (12) is limited to rotate. Equipped with a collar (14), each of the slide bars (5) is rotatably connected to the collar (14) with a telescopic rod (15). The inner wall of the upper rotating sleeve (12) is provided with a first wave groove (31). The outer wall of the vertical rod (11) is fixed with a first pin (32) that is slidably installed in the first wave groove (31). The first wave groove (31) is composed of multiple sets of V-shaped grooves connected end to end, and the V-shaped groove includes an inclined groove and a vertical groove. The spline sleeve (22) is connected to one of the switching wheels (6) by an elastic transmission belt. The driving component includes a plate (30) fixed to the outer wall of the support leg (2), and a rotating shaft (24) that can rotate is installed between the plate (30) and the center bottom of the top support plate (1). A lifting ring (26) is sleeved on the outer wall of the rotating shaft (24). A connecting rod (27) is rotatably connected between the lifting ring (26) and the bottom of each inner support bar (3). A fixing tube is fixed on the top of the plate (30), and a lower sleeve (28) sleeved on the rotating shaft (24) is vertically slidably installed inside the fixing tube. A second tension spring (29) is connected between the lower sleeve (28) and the plate (30). A second wave groove (33) is opened on the inner wall of the lower sleeve (28). A second pin (34) is fixed on the outer wall of the rotating shaft (24) and slidably installed in the second wave groove (33). The second wave groove (33) is composed of a horizontal groove, an oblique groove and a vertical groove connected end to end. The drive unit includes a drive shaft (23) that is rotatably mounted inside the top support plate (1), and the drive shaft (23) is driven by a servo motor mounted at the bottom of the top support plate (1). An intermittent transmission assembly is provided between the top end of the drive shaft (23) and the spline sleeve (22), and a meshing gear (25) is fixed between the bottom end of the drive shaft (23) and the outer wall of the rotating shaft (24).

2. The sealing ring tensile property testing device according to claim 1, characterized in that: The intermittent transmission assembly includes a disc (17) and a notched disc (18) coaxially fixed to the top of the drive shaft (23). A pin (19) is fixed to the top of the disc (17) at the notch position of the notched disc (18). A driven disc (16) is fixed to the outer wall of the spline sleeve (22). The outer wall of the driven disc (16) is provided with a plurality of annularly distributed grooves (20). The pin (19) can rotate into the groove (20) and rotate the driven disc (16). An arc-shaped groove (21) is provided between adjacent grooves (20) so that the notched disc (18) can rotate into and lock.

3. The sealing ring tensile property testing device according to claim 1, characterized in that: The sensing component includes multiple speed sensors (9) fixed on the top of the top support plate (1), and the speed sensors (9) correspond one-to-one with the inner support bars (3). It also includes a pressure sensor (10) installed on the slide bar (5) to monitor the force intensity of the switching wheel (6).

4. The sealing ring tensile property testing device according to claim 1, characterized in that: When the multiple arc-shaped support plates (4) are in the state of circular support surface, the telescopic rod (15) is in the shortest state.

5. The sealing ring tensile property testing device according to any one of claims 1-4, characterized in that: The inner support bar (3) and the edge groove of the top support plate (1) are connected by ball bearings.

6. A method for determining the tensile properties of a sealing ring, comprising using the sealing ring tensile property testing device according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Installation and alignment: The sealing ring (35) to be tested is placed on the support surface formed by the outer arc surface of multiple arc support plates (4), so that each inner support bar (3) is in the initial position, and the switching wheel (6) is in an in-tangent state with the outer arc surface; S2, Tensile loading: The driving component simultaneously drives multiple inner support bars (3) to expand outward in a circumferential manner along the edge groove of the top support plate (1) until the preset threshold is reached, thus stretching the sealing ring (35) in a circumferential manner. S3, Tripping and Restoration: After reaching the threshold, the drive component disconnects from each inner support bar (3), so that each inner support bar (3) is in a free state and restores itself inward under the elastic action of the sealing ring (35). The sensing component collects the speed data of each inner support bar (3) during the restoration process. S4. Pressure measurement: Before and after restoration, the pressure value of the sealing ring (35) on the arc support plate (4) is obtained by the sensing component and the change is calculated. S5, Contact position switching: The switching wheel (6) is controlled to extend and rotate outward along the direction of the inner support bar (3) by the switching component, so that the sealing ring (35) and multiple switching wheels (6) form a transmission, and the sealing ring (35) is displaced relative to the outer arc surface of the arc support plate (4) at a predetermined angle. Then the switching wheel (6) is reset to the state of being tangent to the outer arc surface. S6. Cycling and Evaluation: Repeat S2 to S5 at least once. Based on the speed data and pressure change of each cycle, determine the resilience of the sealing ring (35) and whether there is permanent deformation. Use the consistency of the results obtained at different contact positions as the evaluation basis for tensile uniformity.

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