Seal ring inner diameter detection device and detection method thereof

Abstract

The application relates to the technical field of sealing ring detection, and specifically discloses a sealing ring inner diameter detection device and a detection method thereof, which comprises a cross frame, four groups of sliding blocks are slidingly arranged in the cross frame, a sliding rod is slidingly arranged in each perforation formed in the side wall of each group of sliding blocks, a spring is arranged between the sliding rod and the inner wall of the perforation, a sliding frame is fixedly arranged at one end of the sliding rod, a supporting roller is rotatably arranged in the sliding frame, and the side wall of the supporting roller is provided with a rough surface and a smooth surface. The smooth surface of the supporting roller is in contact with the inner wall of the sealing ring by controlling the synchronous sliding of the four groups of sliding blocks through a driving assembly, automatic centering and inner diameter measurement are realized, the non-circularity is detected by using an elastic connection structure, and the data accuracy is ensured; subsequently, a switching assembly switches the supporting roller to the rough surface, expands the sealing ring into a quadrilateral, and intuitively evaluates the material uniformity and tensile force consistency.

Description

Technical Field

[0001] This invention relates to the field of sealing ring testing technology, specifically to a sealing ring inner diameter testing device and testing method. Background Technology

[0002] A sealing ring is a circular elastic sealing device, mainly used for static sealing and reciprocating motion sealing. It can prevent liquid or gas leakage. The choice of its material directly affects the sealing performance and service life. Commonly used materials include nitrile rubber and fluororubber. It is suitable for bearing sealing, hydraulic systems and other scenarios. In the fields of machinery manufacturing, automobiles, hydraulics and pneumatics, sealing rings are key components to ensure the airtightness of the system. Since the accuracy of its inner diameter directly affects the assembly effect and sealing performance, it is usually necessary to test the inner diameter of the sealing ring.

[0003] For example, Chinese patent CN120506870A discloses a sealing ring inner diameter detection device and its inner diameter detection method, including an outer conical tube and a guide tube. One end of the guide tube and the outer conical tube can be inserted. A push tube is movably sleeved on the outer circumference of the guide tube. The outer conical tube is a tube with a gradually changing diameter from small to large. When the guide tube and the outer conical tube are inserted, the small diameter end of the outer conical tube is placed inside the push tube. A scale is arranged side by side on one side of the outer conical tube. A sealing ring is fitted on the outer conical tube. The structure is simple and easy to operate. It can quickly and accurately measure the inner diameter of the rotating glyph and can simultaneously detect the roundness, elasticity, wear degree and hardness of the rotating glyph.

[0004] However, when measuring the inner diameter of the sealing ring using the above method, it is difficult to reflect the roundness of the entire circumference of the sealing ring. Only the inner diameter value of the sealing ring can be measured. If the sealing ring has a certain degree of non-roundness, it will be stretched to be round before measurement, making it difficult to measure the actual condition of the sealing ring. Furthermore, a sealing ring that is a standard circle when not under stress may expand to different degrees under tension due to material uniformity or different local tensions, resulting in insufficient sealing performance of the sealing ring during actual use. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing ring inner diameter detection device and detection method to solve at least one technical problem existing in the prior art.

[0006] To achieve the above objectives, in a first aspect, the present invention provides the following technical solution: a sealing ring inner diameter detection device, comprising a cross frame, four sets of sliding blocks slidably installed in the cross frame, a sliding rod slidably installed in a perforation opened on the side wall of each set of sliding blocks, a spring provided between the sliding rod and the inner wall of the perforation, a sliding frame fixedly installed at one end of the sliding rod, a support roller rotatably installed in the sliding frame, and the side wall of the support roller having a rough surface and a smooth surface;

[0007] It also includes a drive component, which is used to drive four sets of sliding blocks to slide synchronously within the cross frame;

[0008] It also includes a switching component for driving the position switching between the rough and smooth surfaces of the support roller.

[0009] Preferably, the driving component includes a fixed ring below the cross frame, a rotating shaft that can be rotated and adjusted is installed on the top surface of the fixed ring, a rotating disk is fixedly installed on the top surface of the rotating shaft, and four sets of arc-shaped grooves are opened on the outer wall of the rotating disk. Each set of sliding blocks has a fixed pin that corresponds to the arc-shaped groove on its bottom surface, and each set of fixed pins is slidably installed in its corresponding arc-shaped groove.

[0010] Preferably, the switching assembly includes a sliding rod slidably mounted on the bottom end of the support roller via a flat key, a spring is provided between the sliding rod and the support roller, an elastic pin is fixedly mounted on the outer wall of the sliding frame, a reversing slide is provided on the outer wall of the sliding rod, the reversing slide is composed of two vertical grooves and two inclined grooves connected end to end in sequence, the elastic pin can slide in the reversing slide, and the thickness of the side wall of the reversing slide gradually decreases along the sliding direction of the elastic pin, a fixing frame is fixedly mounted on the bottom surface of the cross frame, and one end of the sliding rod that protrudes from the sliding frame can contact and abut against the fixing frame.

[0011] Preferably, one end of the vertical groove in the deflection track extends beyond its connection point with the inclined groove.

[0012] Preferably, a testing platform is fixedly installed on the outer wall of the cross frame, and multiple sets of arc-shaped slides are opened on the outer wall of the testing platform. A support frame is slidably installed in each set of arc-shaped slides. A rotating ring that can be vertically slidably adjusted is rotatably installed on the inner wall of the fixed ring. Each set of support frames is fixedly connected to the rotating ring through a support rod.

[0013] It also includes a drive unit for driving the rotating ring to rotate for adjustment.

[0014] Preferably, the driving part includes a toothed groove formed on the inner wall of the rotating ring, a rotating gear that meshes with the toothed groove and can be rotated and adjusted is rotatably mounted on the inner top surface of the fixed ring, a sliding groove is provided on the outer wall of the rotating ring, the sliding groove is composed of multiple sets of V-shaped inclined grooves connected end to end, and a limiting pin that can slide along the sliding groove is fixedly installed on the inner wall of the fixed ring.

[0015] Preferably, a fixing rod is fixedly installed on the outer wall of the rotating shaft, a rotating rod is coaxially rotatably installed above the rotating gear, a connecting rod is rotatably installed between one end of the rotating rod and one end of the fixing rod, multiple sets of slots are opened on the outer wall of the rotating gear, an elastic block that can be inserted into the slot is slidably installed on the bottom surface of the rotating rod, one side of the elastic block is set as an inclined surface, and a compression spring is provided between the elastic block and the bottom surface of the rotating rod.

[0016] Preferably, the fixing frame can slide along the outer wall of the cross frame, and the height between the fixing frame and the sliding frame can be adjusted by the connecting frames on both sides.

[0017] Secondly, the present invention provides a detection method using a sealing ring inner diameter detection device, comprising the following steps:

[0018] Step 1: First, place the sealing ring to be tested on the test platform. Then, the external drive structure drives the rotating shaft to rotate the rotating disk. When the rotating disk rotates, it will drive the four sets of sliding blocks and the support rollers to slide along the cross frame through the arc groove. When the four sets of sliding blocks make centrifugal motion together, the support rollers gradually move towards the inner wall of the sealing ring until the pressure sensor in the rotating shaft of a certain set of support rollers detects that the support rollers are in contact with the inner wall of the sealing ring.

[0019] Step Two: At this point, the sealing ring is gradually shifted and rotated due to the pressure from the smooth surface of the support rollers, causing the center of the sealing ring to coincide with the center of the rotating disk. The inner diameter of the sealing ring can then be detected by reading the numbers on the cross frame. Furthermore, since the two sets of support rollers that initially contact the inner wall of the sealing ring will gradually coincide with the shortest inner diameter of the sealing ring as it rotates, the non-roundness of the sealing ring, i.e., the difference between the longest and shortest inner diameters, can be calculated using four sets of sliding frames of varying lengths.

[0020] Step 3: At this time, the external drive structure drives the rotating disk to rotate in the opposite direction, causing multiple sets of support rollers to contract inward until the sliding rod is squeezed upward by the fixed frame. Through the cooperation between the change-direction slide and the elastic pin, the support rollers are flipped, and the rough surface faces the inner wall of the sealing ring.

[0021] Step 4: Then, the sealing ring is rounded again by the support roller. At this time, since the contact surface between the support roller and the sealing ring is rough, the sealing ring cannot deflect. The sealing ring can be rounded into a quadrilateral shape, and the uniformity of the sealing ring material and tensile tension can be detected by observing whether the lengths of the four sides are equal.

[0022] Step 5: Repeat steps 1 through 4 above.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] I. This invention controls four sets of sliding blocks to slide synchronously through a drive component, bringing the smooth surface of the support roller into contact with the inner wall of the sealing ring. This achieves automatic centering and inner diameter measurement, while an elastic connection structure detects non-roundness, ensuring data accuracy. Subsequently, a switching component turns the support roller to a rough surface, expanding the sealing ring into a quadrilateral shape for direct evaluation of material uniformity and tensile tension consistency. This design not only improves the efficiency and automation of testing but also enables multi-dimensional analysis in a single operation, comprehensively ensuring the reliability of the sealing ring's quality. It is suitable for rapid quality inspection and product optimization in industrial production, effectively reducing the defect rate and extending the service life of the seals.

[0025] II. This invention uses a rotating shaft to drive a rotating disk, and utilizes the precise fit between an arc-shaped groove and a fixed pin to convert the rotational motion into the synchronous centrifugal motion of four sets of sliding blocks. This transmission mechanism not only achieves precise synchronous expansion and contraction of the support roller, ensuring uniform force on the sealing ring during measurement, but also, through the special trajectory design of the arc-shaped groove, keeps the sliding blocks stable during movement, effectively avoiding the jamming phenomenon easily caused by traditional linkage mechanisms. This drive scheme has a compact structure and high transmission efficiency. Combined with the stable support of the fixed ring, it significantly improves the repeatability and service life of the entire detection device, making it particularly suitable for achieving rapid, continuous, and accurate measurement operations on automated testing production lines.

[0026] Third, this invention controls the lifting and rotation of the rotating ring through a drive unit, and, in conjunction with the guiding action of the support frame within the arc-shaped slide, achieves automatic pickup, rotation, and resetting of the sealing ring. After completing the initial extended detection, the mechanism can lift and rotate the sealing ring by a specific angle, followed by a secondary extended detection, thereby sampling the material properties at multiple points on different locations of the sealing ring's inner wall. This multi-position cyclic detection mechanism effectively overcomes the limitations of single-detection, enabling a comprehensive assessment of the circumferential material uniformity and tensile tension distribution of the sealing ring, significantly improving the dimensionality and accuracy of the detection. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a side cross-section of the present invention. Figure 1 ;

[0029] Figure 3 In this invention Figure 2 Isometric side section view;

[0030] Figure 4 This is a side cross-section of the present invention. Figure 2 ;

[0031] Figure 5 This is a cross-section of the rotating ring in this invention. Figure 1 ;

[0032] Figure 6 In this invention Figure 5 Isometric cross-section;

[0033] Figure 7 This is a cross-section of the rotating ring in this invention. Figure 2 ;

[0034] Figure 8 In this invention Figure 7 Isometric cross-section;

[0035] Figure 9 This is a three-dimensional structural diagram of the sliding rod in this invention;

[0036] Figure 10 This is a three-dimensional structural diagram of the rotating ring in this invention;

[0037] Figure 11 This is a cross-sectional view of the rotating gear in this invention;

[0038] Figure 12 This is a cross-sectional view of the rotating rod in this invention;

[0039] Figure 13 This is a three-dimensional structural diagram of the elastic block in this invention.

[0040] In the diagram: 1. Testing table; 2. Cross frame; 3. Arc-shaped slide; 4. Support frame; 5. Sliding frame; 6. Support roller; 7. Sliding block; 8. Fixing pin; 9. Sliding rod; 10. Directional slide; 11. Elastic pin; 12. Sliding rod; 13. Fixing frame; 14. Rotating ring; 15. Fixing ring; 16. Rotating disk; 17. Rotating gear; 18. Arc-shaped groove; 19. Rotating rod; 20. Connecting rod; 21. Fixing rod; 22. Rotating shaft; 23. Slide groove; 24. Elastic block; 25. Slot. 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 13The present invention provides a technical solution: a sealing ring inner diameter detection device, including a cross frame 2, four sets of sliding blocks 7 are slidably installed in the cross frame 2, and a sliding rod 12 is slidably installed in the perforation opened on the side wall of each set of sliding blocks 7. A spring is provided between the sliding rod 12 and the inner wall of the perforation. A sliding frame 5 is fixedly installed at one end of the sliding rod 12. A support roller 6 is rotatably installed in the sliding frame 5. The side wall of the support roller 6 is provided with a rough surface and a smooth surface.

[0043] It also includes a drive component, which is used to drive the four sets of sliding blocks 7 to slide synchronously within the cross frame 2;

[0044] It also includes a switching component, which drives the position switching between the rough and smooth surfaces of the support roller 6.

[0045] In use, the sealing ring to be tested is first placed above the cross frame 2. Then, the drive assembly drives four sets of sliding blocks 7 to slide synchronously within the cross frame 2. When the four sets of sliding blocks 7 move centrifugally together, the support rollers 6 gradually move towards the inner wall of the sealing ring until the pressure sensors inside the rotating shafts of the multiple sets of support rollers 6 detect that the support rollers 6 are in contact with the inner wall of the sealing ring. Since the contact surface between the support rollers 6 and the sealing ring is smooth at this time, when both sets of opposing support rollers 6 are in contact with the inner wall of the sealing ring, the sealing ring begins to shift and rotate under force until the center of the sealing ring coincides with the center of the cross frame 2. By observing the readings above the cross frame 2, the inner diameter of the sealing ring can be obtained, completing the centering and measurement of the sealing ring. Furthermore, because the sliding blocks 7 and the sliding frame 5 are elastically connected, when the four sets of... When the values ​​presented by the support roller 6 show a difference, the non-circularity of the sealing ring can be determined by the difference between the longest and shortest diameters of the sealing ring, further improving the dimensionality and accuracy of the detection. After completing one detection, multiple sets of support rollers 6 are retracted, and the contact surface between the support rollers 6 and the inner wall of the sealing ring is changed from a smooth surface to a rough surface by the switching component. The sealing ring is then stretched into a quadrilateral by moving multiple sets of support rollers 6. Since the sealing ring cannot rotate relative to the support rollers 6 at this time, if the lengths of the four sides of the sealing ring are not uniform, even if the surface sealing ring is a standard circle under industrial error when it is not under stress, its material uniformity and tensile tension are inconsistent. If the sealing ring expands into a standard square, it indicates that its material uniformity and tensile tension are consistent, and it can provide higher sealing performance during use.

[0046] In this way, the four sets of sliding blocks 7 are controlled to slide synchronously by the drive component, so that the smooth surface of the support roller 6 contacts the inner wall of the sealing ring, realizing automatic centering and inner diameter measurement. At the same time, the elastic connection structure is used to detect non-roundness, ensuring data accuracy. Subsequently, the switching component turns the support roller 6 to a rough surface, expanding the sealing ring into a quadrilateral, allowing for a direct assessment of material uniformity and tensile tension consistency. This design not only improves the efficiency and automation of the inspection, but also completes multi-dimensional analysis in a single operation, thereby comprehensively ensuring the quality and reliability of the sealing ring. It is suitable for rapid quality inspection and product optimization in industrial production, effectively reducing the defect rate and extending the service life of the seals.

[0047] Furthermore, the drive assembly includes a fixing ring 15 below the cross frame 2. A rotating shaft 22 that can be rotated and adjusted is installed on the top surface of the fixing ring 15. A rotating disk 16 is fixedly installed on the top surface of the rotating shaft 22. Four sets of arc-shaped grooves 18 are opened on the outer wall of the rotating disk 16. A fixing pin 8 corresponding to the arc-shaped groove 18 is fixedly installed on the bottom surface of each set of sliding blocks 7, and each set of fixing pins 8 is slidably installed in its corresponding arc-shaped groove 18.

[0048] A specific implementation of the driver component is provided based on the above embodiments. See details below. Figure 5 When an external drive structure (such as a motor) drives the rotating shaft 22 to rotate together with the rotating disk 16, the rotating disk 16 drives multiple sets of sliding blocks 7 to perform centrifugal expansion or centripetal convergence through the cooperation between the fixed pin 8 and the arc groove 18, thus completing the synchronous drive of the four sets of support rollers 6.

[0049] In this way, the rotating disk 16 is driven to rotate by the rotating shaft 22, and the rotational motion is converted into the synchronous centrifugal motion of the four sets of sliding blocks 7 by the precise cooperation between the arc groove 18 and the fixed pin 8. This transmission mechanism not only realizes the precise synchronous expansion and contraction of the support roller 6, ensuring that the force on the sealing ring is uniform and consistent during the measurement process, but also, through the special trajectory design of the arc groove 18, keeps the sliding blocks 7 stable during movement, effectively avoiding the jamming phenomenon that is prone to occur in traditional linkage mechanisms. This drive scheme has a compact structure and high transmission efficiency. With the stable support of the fixed ring 15, it significantly improves the repeatability and service life of the entire detection device, and is particularly suitable for realizing fast, continuous and accurate measurement operations on automated detection production lines.

[0050] Furthermore, the switching assembly includes a sliding rod 9 slidably mounted on the bottom end of the support roller 6 via a flat key. A spring is provided between the sliding rod 9 and the support roller 6. An elastic pin 11 is fixedly mounted on the outer wall of the sliding frame 5. A reversing slide 10 is provided on the outer wall of the sliding rod 9. The reversing slide 10 is composed of two vertical grooves and two inclined grooves connected end to end in sequence. The elastic pin 11 can slide in the reversing slide 10, and the thickness of the side wall of the reversing slide 10 gradually decreases along the sliding direction of the elastic pin 11. A fixing frame 13 is fixedly mounted on the bottom surface of the cross frame 2. One end of the sliding rod 9 that protrudes from the sliding frame 5 can contact and abut against the fixing frame 13.

[0051] Furthermore, one end of the vertical groove inside the deflection slide 10 extends beyond its connection point with the inclined groove.

[0052] A specific implementation of the switching component is provided based on the above embodiments. See details below. Figure 2 When the rotating disk 16 drives multiple sets of sliding blocks 7 to converge towards the center, the sliding rod 9 is pressed upward by the fixed frame 13, causing the sliding rod 9 to rotate 180 degrees under the cooperation of the elastic pin 11 and the deflecting slide rail 10. Figure 9 As shown, the elastic pin 11 slides along the inclined groove in the deflection slide 10 until the sliding rod 9 rotates 180 degrees. Then, the rotating disk 16 drives multiple sets of sliding blocks 7 to slide centrifugally. At this time, the elastic pin 11 enters the vertical groove and slides. This allows the support roller 6 to change from a smooth surface to a rough surface during the secondary expansion process. This enables the support roller 6 to contact the inner wall of the sealing ring with two different roughness contact surfaces. This allows the sealing ring to switch between rotating along the outer wall of the support roller 6 and being stationary. During the first expansion, the sliding centering minimizes the impact of the friction between the sealing ring and the support roller 6 on the test results. During the second deep expansion, the increased friction reduces the impact of sliding on the tensile state of the sealing ring, further improving the accuracy of the test results.

[0053] In this way, through the contact and cooperation between the fixed frame 13 and the sliding rod 9, combined with the special track design of the reversing slide 10, the support roller 6 achieves automatic 180-degree rotation during the contraction process. When the sliding block 7 converges towards the center, the sliding rod 9 is squeezed upward by the fixed frame 13, and the elastic pin 11 slides along the inclined groove of the reversing slide 10, driving the support roller 6 to complete the working surface switching; subsequently, during the secondary expansion, the elastic pin 11 enters the vertical groove to maintain a stable position. This innovative design ensures that the conversion between two testing modes is automatically completed in one testing process: during the first expansion, the smooth surface of the support roller 6 ensures that the sealing ring rotates freely, achieving accurate centering and inner diameter measurement; during the secondary expansion, the rough surface provides sufficient friction to stably expand the sealing ring into a quadrilateral shape, accurately assessing the material uniformity and tensile properties. This switching mechanism not only achieves a high degree of automation in the testing process, but also effectively avoids human operation errors through precise working surface switching, significantly improving the reliability and consistency of the testing data. At the same time, the overall structure is simple and reliable, greatly enhancing the practicality and service life of the equipment.

[0054] It is worth mentioning that, since one end of the vertical groove in the reversing slide 10 extends beyond its connection point with the inclined groove, when the elastic pin 11 is at the end of the vertical groove in the reversing slide 10, if the sliding rod 9 is not squeezed by the fixed frame 13, that is, when multiple sets of sliding blocks 7 are retracted, the sliding rod 9 is at the end of the vertical groove in the reversing slide 10 and completes the rotation lock of the support roller 6 through the flat key. When the sliding rod 9 is pressed and rises, it will slide first and then rotate, that is, ensure that the support roller 6 is completely separated from the sealing ring before rotating, so as to avoid the support roller 6 interfering with the centering of the sealing ring.

[0055] Furthermore, a testing platform 1 is fixedly installed on the outer wall of the cross frame 2. Multiple sets of arc-shaped slides 3 are opened on the outer wall of the testing platform 1. A support frame 4 is slidably installed in each set of arc-shaped slides 3. A rotating ring 14 that can be vertically slidably adjusted is rotatably installed on the inner wall of the fixed ring 15. Each set of support frames 4 is fixedly connected to the rotating ring 14 through a support rod.

[0056] It also includes a drive unit, which is used to drive the rotating ring 14 to rotate for adjustment.

[0057] As can be seen from the above implementation method, after the multiple sets of support rollers 6 expand the sealing ring into a quadrilateral shape for measurement, the rotating ring 14 can be driven vertically upward by the external drive component, which drives the multiple sets of support frames 4 to rise and support the sealing ring. At the same time, the drive unit drives the rotating ring 14 to rotate, causing the sealing ring to rotate a certain distance. Then the sealing ring falls back onto the detection table 1, and the multiple sets of support rollers 6 are driven to expand the sealing ring again for testing. That is, by fixing different positions on the inner wall of the sealing ring and expanding the sealing ring multiple times, the material uniformity and tensile tension of the sealing ring are tested, which further improves the detection dimensions and performance of the sealing ring.

[0058] In this way, by controlling the lifting and rotation of the rotating ring 14 through the drive unit, and cooperating with the guiding action of the support frame 4 within the arc-shaped slide 3, the automatic pickup, rotation, and reset of the sealing ring are achieved. After completing the initial expansion test, the mechanism can lift and rotate the sealing ring at a specific angle, and then perform a second expansion test, thereby sampling the material properties at multiple points on different locations on the inner wall of the sealing ring. This multi-position cyclic testing mechanism effectively overcomes the limitations of single testing, and can comprehensively evaluate the material uniformity and tensile tension distribution in the circumferential direction of the sealing ring, significantly improving the dimensionality and accuracy of the test. At the same time, the automated process enables multiple repeated tests on the same sealing ring, ensuring the consistency and reliability of the test results, and providing more comprehensive data support for predicting the service life and sealing performance of the sealing ring under actual working conditions. It is particularly suitable for the quality inspection of precision parts with high sealing performance requirements.

[0059] Furthermore, the drive unit includes a toothed groove formed on the inner wall of the rotating ring 14, and a rotating gear 17 that meshes with the toothed groove and can be rotated and adjusted is rotatably mounted on the inner top surface of the fixed ring 15. The outer wall of the rotating ring 14 is provided with a sliding groove 23, which is composed of multiple sets of V-shaped inclined grooves connected end to end. A limiting pin that can slide along the sliding groove 23 is fixedly installed on the inner wall of the fixed ring 15.

[0060] A specific implementation of the driver component is provided based on the above embodiments. See details below. Figure 2 When the external drive component drives the rotating gear 17 to rotate, the rotating gear 17 synchronously drives the rotating ring 14 to rotate relative to the fixed ring 15. The rotating ring 14 rises while rotating due to the influence of the limiting pin and the sliding groove 23 on the inner wall of the fixed ring 15, which lifts the support frame 4 and makes the sealing ring separate from the test table 1, thus avoiding changing the positioning center of the sealing ring when adjusting the position of the sealing ring.

[0061] Furthermore, a fixed rod 21 is fixedly installed on the outer wall of the rotating shaft 22, and a rotating rod 19 is coaxially rotatably installed above the rotating gear 17. A connecting rod 20 is rotatably installed between one end of the rotating rod 19 and one end of the fixed rod 21. Multiple sets of slots 25 are opened on the outer wall of the rotating gear 17. An elastic block 24 that can be inserted into the slot 25 is slidably installed on the bottom surface of the rotating rod 19. One side of the elastic block 24 is set as an inclined surface, and a compression spring is provided between the elastic block 24 and the bottom surface of the rotating rod 19.

[0062] As can be seen from the above implementation, when the external drive structure drives the rotating shaft 22 to rotate, the rotating shaft 22 drives the fixed rod 21 to rotate and pulls the rotating rod 19 to rotate together through the connecting rod 20. When the rotating rod 19 rotates, the elastic block 24 is embedded in the slot 25. When the rotation direction of the rotating rod 19 is on the same side as the inclined surface of the elastic block 24, the elastic block 24 is squeezed and slides into the rotating rod 19. When the rotation direction of the rotating rod 19 is on the same side as the vertical surface of the elastic block 24, the elastic block 24 drives the rotating gear 17 to rotate together. That is, when multiple sets of support rollers 6 expand synchronously, the rotating rod 19 cannot drive the rotating gear 17 to rotate. When the test is completed, the multiple sets of support rollers 6 contract synchronously until the sliding rod 9 contacts and abuts against the fixed frame 13. The rotating rod 19 drives the rotating gear 17 to rotate, and the sealing ring is rotated and adjusted, which facilitates multiple multi-point tests of the sealing ring.

[0063] Furthermore, the fixing frame 13 can slide along the outer wall of the cross frame 2, and the height between the fixing frame 13 and the sliding frame 5 can be adjusted by the connecting frames on both sides.

[0064] As can be seen from the above embodiments, by adjusting the position of the fixing frame 13 in the cross frame 2, different sizes of sealing rings can be accommodated, and by adjusting the height between the fixing frame 13 and the sliding frame 5, secondary interference of the fixing frame 13 on the movement of the sliding rod 9 can be avoided.

[0065] A detection method using a sealing ring inner diameter detection device includes the following steps:

[0066] Step 1: First, place the sealing ring to be tested on the test table 1. Then, drive the rotating shaft 22 to rotate the rotating disk 16 through the external drive structure. When the rotating disk 16 rotates, it will drive the four sets of sliding blocks 7 and the support rollers 6 to slide along the cross frame 2 through the arc groove 18. When the four sets of sliding blocks 7 move centrifugally together, the support rollers 6 gradually move towards the inner wall of the sealing ring until the pressure sensor in the rotating shaft of a certain set of support rollers 6 detects that the support rollers 6 are in contact with the inner wall of the sealing ring.

[0067] Step Two: At this point, the sealing ring is gradually shifted and rotated due to the pressure from the smooth surface of the support roller 6, causing the center of the sealing ring to coincide with the center of the rotating disk 16. The inner diameter of the sealing ring can then be detected by the readings on the cross frame 2. As the two sets of support rollers 6 that initially contact the inner wall of the sealing ring rotate, they will gradually coincide with the shortest inner diameter of the sealing ring. The non-roundness of the sealing ring, i.e., the difference between the longest and shortest inner diameters, can then be calculated using the four sets of sliding frames 5 of different lengths.

[0068] Step 3: At this time, the external drive structure drives the rotating disk 16 to rotate in the opposite direction, causing multiple sets of support rollers 6 to contract inward until the sliding rod 9 is squeezed upward by the fixed frame 13. Through the cooperation between the reversing slide 10 and the elastic pin 11, the support roller 6 is flipped, and the rough surface faces the inner wall of the sealing ring.

[0069] Step 4: Then, the sealing ring is rounded again by the support roller 6. At this time, since the contact surface between the support roller 6 and the sealing ring is rough, the sealing ring cannot deflect. The sealing ring can be rounded into a quadrilateral shape, and the uniformity of the sealing ring material and tensile tension can be detected by observing whether the lengths of the four sides are equal.

[0070] Step 5: Repeat steps one through four above.

[0071] 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.

[0072] 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 detecting the inner diameter of a sealing ring, comprising a cross frame (2), characterized in that: Four sets of sliding blocks (7) are slidably installed inside the cross frame (2). A sliding rod (12) is slidably installed in the perforation opened on the side wall of each set of sliding blocks (7). A spring is provided between the sliding rod (12) and the inner wall of the perforation. A sliding frame (5) is fixedly installed at one end of the sliding rod (12). A support roller (6) is rotatably installed inside the sliding frame (5). The side wall of the support roller (6) is provided with a rough surface and a smooth surface. The cross frame (2) also includes a driving component, which is used to drive the four sets of sliding blocks (7) to slide synchronously inside the cross frame (2). The cross frame (2) also includes a switching component, which is used to drive the position switching between the rough surface and the smooth surface of the support roller (6). The drive assembly includes a fixed ring (15) below the cross frame (2). A rotating shaft (22) that can be rotated and adjusted is installed on the top surface of the fixed ring (15). A rotating disk (16) is fixedly installed on the top surface of the rotating shaft (22). Four sets of arc grooves (18) are opened on the outer wall of the rotating disk (16). A fixed pin (8) corresponding to the arc groove (18) is fixedly installed on the bottom surface of each set of sliding blocks (7). Each set of fixed pins (8) is slidably installed in its corresponding arc groove (18). The switching assembly includes a sliding rod (9) that is slidably mounted on the bottom end of the support roller (6) via a flat key. A spring is provided between the sliding rod (9) and the support roller (6). An elastic pin (11) is fixedly mounted on the outer wall of the sliding frame (5). A reversing slide (10) is provided on the outer wall of the sliding rod (9). The reversing slide (10) is composed of two vertical grooves and two inclined grooves connected end to end in sequence. The elastic pin (11) can slide in the reversing slide (10). The thickness of the side wall of the reversing slide (10) gradually decreases along the sliding direction of the elastic pin (11). A fixing frame (13) is fixedly mounted on the bottom surface of the cross frame (2). One end of the sliding rod (9) that protrudes from the sliding frame (5) can contact and abut against the fixing frame (13). The outer wall of the cross frame (2) is fixedly installed with a testing platform (1). The outer wall of the testing platform (1) has multiple sets of arc-shaped slides (3). Each set of arc-shaped slides (3) is slidably installed with a support frame (4). The inner wall of the fixed ring (15) is rotatably installed with a rotating ring (14) that can be vertically slidably adjusted. Each set of support frames (4) is fixedly connected to the rotating ring (14) through a support rod. The system also includes a driving unit, which is used to drive the rotating ring (14) to rotate and adjust.

2. The sealing ring inner diameter detection device according to claim 1, characterized in that: One end of the vertical groove in the deflection slide (10) extends beyond its connection point with the inclined groove.

3. The sealing ring inner diameter detection device according to claim 2, characterized in that: The drive unit includes a toothed groove formed on the inner wall of the rotating ring (14). A rotating gear (17) that meshes with the toothed groove and can be rotated and adjusted is rotatably mounted on the inner top surface of the fixed ring (15). A sliding groove (23) is provided on the outer wall of the rotating ring (14). The sliding groove (23) is composed of multiple sets of V-shaped inclined grooves connected end to end. A limiting pin that can slide along the sliding groove (23) is fixedly installed on the inner wall of the fixed ring (15).

4. The sealing ring inner diameter detection device according to claim 3, characterized in that: A fixed rod (21) is fixedly installed on the outer wall of the rotating shaft (22). A rotating rod (19) is coaxially mounted on the top of the rotating gear (17). A connecting rod (20) is rotatably installed between one end of the rotating rod (19) and one end of the fixed rod (21). Multiple sets of slots (25) are opened on the outer wall of the rotating gear (17). An elastic block (24) that can be embedded in the slot (25) is slidably installed on the bottom surface of the rotating rod (19). One side of the elastic block (24) is set as an inclined surface, and a compression spring is provided between the elastic block (24) and the bottom surface of the rotating rod (19).

5. The sealing ring inner diameter detection device according to claim 1, characterized in that: The fixed frame (13) can slide along the outer wall of the cross frame (2), and the fixed frame (13) can adjust its height with the sliding frame (5) through the connecting frames on both sides.

6. A detection method using the sealing ring inner diameter detection device according to claim 1, characterized in that: Includes the following steps: Step 1: First, place the sealing ring to be tested on the test table (1). Then, drive the rotating shaft (22) through the external drive structure to drive the rotating disk (16) to rotate. When the rotating disk (16) rotates, it will drive the four sets of sliding blocks (7) and the support roller (6) to slide along the cross frame (2) through the arc groove (18). When the four sets of sliding blocks (7) make centrifugal motion together, the support roller (6) gradually moves towards the inner wall of the sealing ring until the pressure sensor in the rotating shaft of a certain set of support rollers (6) detects that the support roller (6) is in contact with the inner wall of the sealing ring. Step 2: At this time, the sealing ring is gradually shifted and rotated due to the pressure of the smooth surface of the support roller (6), so that the center of the sealing ring coincides with the center of the rotating disk (16). The inner diameter of the sealing ring can be detected by the reading on the cross frame (2). As the two sets of support rollers (6) that first contact the inner wall of the sealing ring rotate with the sealing ring, they will gradually coincide with the shortest inner diameter of the sealing ring. The non-roundness of the sealing ring, that is, the difference between the longest inner diameter and the shortest inner diameter, can be calculated by the four sets of sliding frames (5) of different lengths: Step 3: At this time, the external drive structure drives the rotating disk (16) to rotate in the opposite direction, causing multiple sets of support rollers (6) to contract inward until the sliding rod (9) is squeezed upward by the fixed frame (13). Through the cooperation between the reversing slide (10) and the elastic pin (11), the support roller (6) flips over, and the rough surface faces the inner wall of the sealing ring. Step 4: Then, the sealing ring is rounded again by the support roller (6). At this time, since the contact surface between the support roller (6) and the sealing ring is rough, the sealing ring cannot deflect. The sealing ring can be rounded into a quadrilateral and the uniformity of the sealing ring material and the tensile tension can be detected by observing whether the lengths of the four sides are equal. Step 5: Repeat steps 1 through 4 above.

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