Tensile strength detection equipment for rubber and plastic sealing element and detection process thereof

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By designing tensile strength detection equipment for rubber and plastic seals, uniform expansion of seals is achieved by using the opening assembly and the gap compensation assembly, which solves the problem of uneven detection in the existing detection methods and improves the accuracy and reliability of detection.

CN119935744APending Publication Date: 2025-05-06YAROS BUILDING MATERIALS (JIANGSU) CO LTD

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Patent Information

Application Number: CN202510168829.0
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2025-02-17
Publication Date: 2025-05-06

AI Technical Summary

Technical Problem

The tensile strength detection methods of existing rubber and plastic seals have blind spots and stress concentration, resulting in uneven detection and the inability to effectively evaluate the tensile strength of the seal.

Method used

A tensile strength detection device for rubber and plastic seals is designed, using a stretching component and a gap compensation component. Through the movement and gap compensation of the inner support arc block, the sealing component is uniformly subjected to squeeze pressure on the inner wall of the ring hole to achieve uniform stretching.

Benefits of technology

The equipment can evenly open the seal, improve the accuracy and reliability of the inspection, and ensure the effectiveness of the tensile strength detection results of the seal.

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Abstract

The invention discloses a tensile strength detection device of a rubber and plastic sealing member and a detection process thereof, and belongs to the technical field of rubber and plastic member detection.The tensile strength detection device of the rubber and plastic sealing member comprises a base, a detection seat, a sealing member, a lifting seat, a lifting driving element, a rotating shaft, an opening assembly and an inner opening arc block; the opening assembly is used for driving the inner supporting arc block to move in the direction away from the rotating shaft, so that the outer arc face of the inner supporting arc block makes contact with the annular hole wall of the sealing piece, and the sealing piece is expanded. And a backlash compensation assembly. According to the device, the multiple inner supporting arc blocks are driven by the opening assembly to move, so that the outer arc surfaces of the inner supporting arc blocks make contact with the inner wall of the annular hole of the sealing piece, and when the inner supporting arc blocks move to the fixed stroke, the clearance compensation assembly triggers the action, so that the clearance between every two adjacent inner supporting arc blocks can be filled; and the outer arc surfaces of the multiple inner supporting arc blocks form a complete circumferential surface, so that the sealing element can be uniformly supported.

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Description

Technical Field

[0001] The invention belongs to the technical field of rubber and plastic parts detection, and in particular relates to a tensile strength detection device for rubber and plastic sealing parts and a detection process thereof. Background Art

[0002] When the rubber seal is assembled with the parts, an annular mounting groove of the rubber seal needs to be opened on the parts. Since the diameter of the annular mounting groove is larger than the diameter of the rubber seal, the rubber seal will be stretched to a certain extent after being installed in the sealing groove. If the tensile strength and contraction force of the rubber seal are unqualified, the sealing ring will not be able to effectively fit with the annular mounting groove when stretched, and thus will not be able to achieve a sealing effect. Therefore, the tensile strength of the rubber seal needs to be tested after production.

[0003] At present, when testing the tensile strength of rubber and plastic seals, the method is mainly to pull the rubber and plastic seals in multiple directions through multiple hooks to make the rubber and plastic seals in a stretched state, and then perform the tensile strength test on the rubber and plastic seals. However, this method has a large pulling blind area, and the pulling method of the hooks easily produces stress concentration on the surface of the rubber and plastic seals, resulting in the inability to test the tensile strength of the rubber and plastic seals well. Therefore, a testing device that can evenly stretch the rubber and plastic seals is needed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a tensile strength testing device for rubber and plastic seals and a testing process thereof.

[0005] The technical solution adopted to solve the above technical problems is: a tensile strength testing device for rubber and plastic seals, comprising:

[0006] A base and a detection seat fixedly connected to the top of the base, wherein a sealing member limiting groove is provided on the top surface of the detection seat, and a sealing member is placed in the sealing member limiting groove;

[0007] A lifting seat is arranged above the detection seat, and the lifting seat is driven to move vertically by a lifting driving element installed on the detection seat;

[0008] A rotating shaft connected to the bottom of the lifting seat for vertical rotation;

[0009] A plurality of expansion components are arranged in an array along the axial direction of the rotating shaft on the periphery of the rotating shaft, the expansion components are connected to inner arc support blocks, and the expansion components are used to drive the inner arc support blocks to move in a direction away from the rotating shaft so that the outer arc surface of the inner arc support block contacts the annular wall of the sealing member and expands the sealing member;

[0010] A plurality of gap compensation components are arranged on the periphery of the rotating shaft, and the gap compensation components are used to fill the gap between two adjacent inner supporting arc blocks.

[0011] Through the above technical solution, the expansion component drives multiple inner support arc blocks to move, so that the outer arc surface of the inner support arc block contacts the inner wall of the annular hole of the seal, and when the inner support arc block moves to a fixed stroke, the gap compensation component triggers the action, so that the gap between two adjacent inner support arc blocks can be filled, so that the outer arc surfaces of the multiple inner support arc blocks form a complete circular surface, thereby expanding the seal, and the force on the inner wall of the annular hole of the seal is relatively uniform, so that the seal can be evenly expanded.

[0012] Furthermore, the lifting drive element includes ear plates fixedly connected to the outer walls of both sides of the lifting seat, and lifting cylinders are vertically installed on both sides of the detection seat, and the cylinder rod ends of the two lifting cylinders are respectively fixedly connected to the two ear plates.

[0013] Through the above technical solution, the lifting cylinder drives the lifting seat to move downward, so that the rotating shaft moves downward and passes through the annular hole of the sealing member.

[0014] Furthermore, the support assembly includes two sliding hinges respectively slidably mounted on the two ends of the rotating shaft, the sliding hinge is hinged with a hinge rod at the periphery, one end of the hinge rod away from the sliding hinge is correspondingly hinged to the outer wall of the inner support arc block, and the periphery of the rotating shaft is provided with a driving unit for driving the two sliding hinges to move relative to each other.

[0015] Through the above technical solution, the driving unit drives the two sliding hinges to move towards each other, so that the end of the hinge rod away from the sliding hinge swings in the direction away from the rotating shaft, and then the hinge rod drives the inner support arc block to move in the direction away from the rotating shaft.

[0016] Furthermore, the driving unit includes a nut sleeve embedded in the sliding hinge seat, and a threaded section is provided at each axial end of the rotating shaft. The thread rotation directions of the two threaded sections are opposite, and the two nut sleeves are respectively threadedly mounted on the two threaded sections. A servo motor is installed on the lifting seat, and the motor shaft of the servo motor is drivingly connected to the rotating shaft.

[0017] Through the above technical scheme, the servo motor drives the rotating shaft to rotate, so that the two nut sleeves are threadedly engaged with the two threaded segments respectively. Since the thread rotation directions of the two threaded segments are opposite, the two nut sleeves will move relative to each other. The structure is simple and can ensure that the inner support arc block can move horizontally more stably.

[0018] Furthermore, the gap compensation component includes a rotating sleeve which is coaxially rotatably mounted on the periphery of the rotating shaft, a plurality of fixed arms are fixedly connected to the periphery of the rotating sleeve, a sliding rod is passed through one end of the fixed arm away from the rotating sleeve for horizontal sliding, a gap compensation block is fixedly connected to one end of the sliding rod which passes through the fixed arm, a tension spring is wound around the periphery of the sliding rod, two ends of the tension spring are respectively fixed to the gap compensation block and the surface of the fixed arm, and a moving unit is provided on the fixed arm for driving the gap compensation block to move in the direction of the gap between two adjacent inner support arc blocks when the inner support arc block opens the seal.

[0019] Through the above technical solution, when the sliding hinge moves toward the rotating sleeve, the moving unit will drive the sliding rod to move in the direction away from the rotating shaft, thereby driving the gap compensation block to move synchronously. Since the inner support arc block moves before the gap compensation block, the gap compensation block will not interfere with the movement of the inner support arc block. When the gap compensation block is stuck between two adjacent inner support arc blocks, both the inner support arc block and the gap compensation block stop moving. At this time, the outer arc surfaces of the multiple inner support arc blocks form a complete circular surface.

[0020] Furthermore, the movable unit includes a connecting ring connected to one of the end faces of the sliding hinge seat, the end face of the connecting ring is vertically fixed with an insertion rod, the top surface of the fixed arm is provided with a clearance groove for the free passage of the insertion rod, the lower end of the insertion rod is provided with an inclined surface, and the end of the sliding rod away from the gap compensation block is rotatably embedded with a ball, and the ball is used in conjunction with the inclined surface.

[0021] Through the above technical solution, when the inclined surface on the insertion rod contacts the ball, the ball will roll on the inclined surface, so that the ball is subjected to the force of the inclined surface, thereby driving the sliding rod to move toward the outside of the fixed arm and driving the gap compensation block to move synchronously.

[0022] Furthermore, the bottom surface of the lifting seat is connected to an air inlet seat, the air inlet seat is hollow inside and a pressure gauge is installed on the outer wall, the outer wall of the air inlet seat is provided with an air inlet, the inner support arc block is hollow inside and a plurality of air outlet holes are opened on the outer arc surface, the inner support arc block and the air inlet seat are connected by an air pipe, so that the inner cavity of the inner support arc block and the inner cavity of the air inlet seat are in a connected state.

[0023] Through the above technical solution, compressed air enters the air inlet seat from the air inlet, then enters the inner cavity of the inner support arc block through the air pipe, and is then blown out from the air outlet to the contact surface between the inner support arc block and the seal. The pressure change of the pressure gauge can be used to determine whether the air tightness of the seal after being stretched is qualified.

[0024] Furthermore, the top surface of the detection seat is rotatably connected to a ring gear, and a lever dial indicator is installed on the upper end surface of the ring gear. The probe of the lever dial indicator is in contact with the upper surface of the seal, and a driving motor is installed at the bottom of the detection seat. The motor shaft of the driving motor passes through the detection seat and is drivingly connected to a driving gear, and the driving gear is externally meshed with the ring gear.

[0025] Through the above technical solution, the driving motor drives the active gear to rotate, and then drives the ring gear to rotate on the top surface of the detection seat through the meshing transmission of the active gear and the ring gear, thereby driving the lever dial indicator to rotate, so that the probe of the lever dial indicator can detect the flatness of the upper surface of the stretched seal.

[0026] Furthermore, a mounting column is vertically penetrated through the upper end surface of the ring gear, a sliding seat is fixedly connected to the upper end of the mounting column, a receiving groove is provided on the top surface of the sliding seat, a sliding block is mounted in the receiving groove, a plug hole is provided on the top surface of the sliding block, the clamping handle of the lever dial indicator is plugged into the plug hole, convex strips are fixedly connected to the outer walls on both sides of the sliding block, a strip groove for the convex strip to be engaged is provided on the surface of the sliding seat, the convex strip slides freely horizontally in the strip groove, and the sliding block is horizontally fixed to the end away from the sealing member There is a driving rod, which passes through the sliding seat and slides freely. One end of the driving rod passing through the sliding seat is fixedly sleeved with a limit ring. A spring is sleeved around the periphery of the driving rod. The two ends of the spring in the direction of elastic force elastically press against the limit ring and the sliding seat respectively. The top surface of the detection seat is connected with an annular seat. The inner wall of the annular hole of the annular seat is provided with a plurality of notched grooves. When the annular gear rotates, the end of the driving rod passing through the sliding seat slides and contacts the inner wall of the annular hole of the annular seat and the inner wall of the notched groove alternately.

[0027] Through the above technical solution, when the annular gear rotates, the lever dial indicator is synchronously driven to rotate, so that the end of the driving rod slides alternately on the inner wall of the annular seat ring hole and the inner wall of the notch groove, so that the lever dial indicator can generate reciprocating motion along the radial direction of the annular gear while rotating. In this way, the probe of the lever dial indicator can perform flatness detection on various parts of the upper surface of the seal, thereby improving the detection accuracy.

[0028] A tensile strength testing process for rubber and plastic seals, applied to the tensile strength testing equipment as described above, comprises:

[0029] The sealing member is placed in the sealing member limiting groove, and the lifting seat is driven downward by the lifting driving element so that the rotating shaft passes through the sealing member;

[0030] The expansion assembly drives the plurality of inner arc support blocks to move in a direction away from the rotating shaft, and the outer arc surfaces of the inner arc support blocks contact the annular hole wall of the sealing member;

[0031] After the inner support arc block moves to a fixed stroke, the gap compensation component will be triggered to fill the gap between two adjacent inner support arc blocks, so that the outer arc surfaces of multiple inner support arc blocks form a complete circular surface, thereby expanding the seal.

[0032] Through the above technical solution, the expansion component drives the inner support arc block to move, so that the inner support arc block can expand the seal. At the same time, the gap compensation component can fill the gap between two adjacent inner support arc blocks, so that the outer arc surface of the inner support arc block forms a complete circular surface, and then the inner support arc block can produce a uniform extrusion pressure on the seal, so that the seal is evenly expanded.

[0033] The beneficial effects of the present invention are as follows:

[0034] (1) In the present invention, the expansion component drives the movement of multiple inner arc blocks, so that the outer arc surface of the inner arc block contacts the inner wall of the annular hole of the seal, and when the inner arc block moves to a fixed stroke, the gap compensation component triggers the action, so that the gap between two adjacent inner arc blocks can be filled, so that the outer arc surfaces of the multiple inner arc blocks form a complete circumferential surface, thereby expanding the seal, and the force acting on the inner wall of the annular hole of the seal is relatively uniform, so that the seal can be evenly expanded;

[0035] (2) In the present invention, compressed air enters the air inlet seat from the air inlet, then enters the inner cavity of the inner arc support block through the air pipe, and then blows out from the air outlet to the contact surface between the inner arc support block and the sealing member. The pressure change of the barometer can be used to determine whether the air tightness of the sealing member after being stretched is qualified;

[0036] (3) In the present invention, when the annular gear rotates, it synchronously drives the lever dial indicator to rotate, so that the end of the driving rod slides alternately on the inner wall of the annular seat ring hole and the inner wall of the notch groove, so that the lever dial indicator can generate reciprocating motion along the radial direction of the annular gear while rotating. In this way, the probe of the lever dial indicator can perform flatness detection on various locations on the upper surface of the seal, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of a tensile strength testing device for rubber and plastic seals in the present invention;

[0038] Figure 2 yes Figure 1 Schematic diagram of the positional relationship of the first perspective;

[0039] Figure 3 yes Figure 1 Schematic diagram of the positional relationship of the second perspective;

[0040] Figure 4It is a schematic diagram of the positional relationship of the rotating shaft, the hinge rod and the sliding hinge seat after being assembled in the present invention;

[0041] Figure 5 yes Figure 4 A schematic diagram of the positional relationship from another perspective;

[0042] Figure 6 yes Figure 4 The schematic diagram of the positional relationship of the annular gear, the annular seat and the drive motor is omitted;

[0043] Figure 7 yes Figure 6 The schematic diagram of the position relationship after the air intake seat is omitted;

[0044] Figure 8 It is a schematic diagram of the positional relationship of the connecting ring, the inserting rod and the fixed arm after being assembled in the present invention;

[0045] Fig. 9 yes Figure 8 Schematic diagram of the explosion decomposition of the structure in the middle;

[0046] Fig.10 It is a schematic diagram of the positional relationship of the annular seat, the annular gear and the lever dial indicator after assembly in the present invention;

[0047] Fig.11 yes Fig.10 A magnified schematic diagram of the local structure at point A;

[0048] Fig.12 yes Fig.10 Schematic diagram of the explosion decomposition of the structure in the middle;

[0049] Fig.13 yes Fig.12 An enlarged schematic diagram of the local structure at point B.

[0050] Figure numerals: 1, base; 2, fixing plate; 3, driving motor; 4, barometer; 5, servo motor; 6, lifting seat; 7, annular seat; 8, detection seat; 9, sealing element; 10, rotating shaft; 11, lifting cylinder; 12, hinge rod; 13, air inlet seat; 14, air inlet; 15, nut sleeve; 16, sliding hinge seat; 17, threaded section; 18, annular gear; 19, inner support arc block; 20, driving gear; 21, stop rod; 22, lever dial indicator ; 23. Fixed arm; 24. Connecting ring; 25. Clearance compensation block; 26. V-shaped groove; 27. Sliding seat; 28. Tension spring; 29. Air vent; 30. Rotating sleeve; 31. Insert rod; 32. Stop pin; 33. Waist-shaped hole; 34. Sliding rod; 35. Inclined surface; 36. Ball; 37. Notched groove; 38. Ball head; 39. Limiting ring; 40. Spring; 41. Mounting column; 42. Strip groove; 43. Raised strip; 44. Sliding block; 45. Driving rod. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0052] like Figure 1-Figure 13 As shown, this embodiment provides a tensile strength testing device for rubber and plastic seals, comprising a base 1, a testing seat 8 is screwed to the top of the base 1, a sealing member limiting groove having an inner diameter larger than the diameter of the sealing member 9 to be tested after being stretched is opened on the top surface of the testing seat 8, and the sealing member 9 to be tested is placed in the sealing member limiting groove;

[0053] Lifting cylinders 11 are vertically installed at both ends of the detection seat 8, and the cylinder rods of the lifting cylinders 11 penetrate the detection seat 8 and slide freely. In addition, a lifting seat 6 is arranged above the detection seat 8, and ear plates are welded on the outer walls of both sides of the lifting seat 6. The cylinder rods of the two lifting cylinders 11 are fixedly connected to the two ear plates respectively, so that the cylinder rods of the lifting cylinders 11 can drive the lifting seat 6 to move vertically when they are extended and retracted;

[0054] The bottom of the lifting seat 6 is connected to the rotating shaft 10 for vertical rotation through the installation bearing. The two ends of the rotating shaft 10 are respectively provided with a threaded section 17. The threaded rotation directions of the two threaded sections 17 are opposite, and the two threaded sections 17 are respectively threaded with a nut sleeve 15. The periphery of the two nut sleeves 15 is fixedly sleeved with a sliding hinge seat 16. The periphery of the sliding hinge seat 16 is hinged with four hinge rods 12 in an array along its axial direction. The hinge rods 12 on the two sliding hinge seats 16 are arranged oppositely and are located at the two sliding hinge seats. The two hinge rods 12 on the same side of the seat 16 are hinged together with an inner support arc block 19, and the upper and lower outer walls of the inner support arc block 19 are respectively hinged with the two hinge rods 12 on the two sliding hinge seats 16. A servo motor 5 is installed on the lifting seat 6, and the motor shaft of the servo motor 5 is drivingly connected to the upper end of the rotating shaft 10 through a coupling. The opposite surfaces of the two adjacent inner support arc blocks 19 are sloped and form a V-shaped groove 26. The spacing size of the inner wall of the V-shaped groove 26 decreases in sequence in the direction away from the rotating shaft 10;

[0055] The bottom surface of the lifting seat 6 is connected to an air inlet seat 13, the air inlet seat 13 is hollow inside and a barometer 4 is installed on the outer wall, an air inlet port 14 is arranged on the outer wall of the air inlet seat 13, the inner support arc block 19 is hollow inside and a plurality of air outlet holes 29 are opened on the outer arc surface, the inner support arc block 19 is connected to the air inlet seat 13 through an air pipe, so that the inner cavity of the inner support arc block 19 and the inner cavity of the air inlet seat 13 are in a communicating state, the air inlet port 14 is connected to an external compressed air device through a pipeline, so that the compressed air device delivers compressed air of a certain pressure from the air inlet port 14 to the air inlet seat 13, at this time the barometer 4 will indicate the pressure of the compressed air, and the compressed air then enters the inner cavity of the inner support arc block 19 through the air pipe;

[0056] The circumference of the rotating shaft 10 is rotatably covered with a rotating sleeve 30, and four fixed arms 23 are fixedly connected to the circumference of the rotating sleeve 30. A sliding rod 34 is horizontally slidably penetrated at one end of the fixed arm 23 away from the rotating sleeve 30, and a gap compensation block 25 is fixedly connected to one end of the sliding rod 34 passing through the fixed arm 23. The gap compensation block 25 has an arc-shaped surface facing away from the rotating shaft 10, and a tension spring 28 is sleeved around the circumference of the sliding rod 34. The two ends of the tension spring 28 are respectively fixed to the surfaces of the gap compensation block 25 and the fixed arm 23. In the initial state, the tension spring 28 generates a pulling force on the gap compensation block 25, so that the gap compensation block 25 moves toward the direction of the rotating shaft 10, and a stop pin 32 is fixedly connected to one end of the sliding rod 34 passing through the fixed arm 23. A waist-shaped hole 33 for the stop pin 32 to be inserted is opened on the fixed arm 23, and the stop pin 32 slides freely in the waist-shaped hole 33, so that the sliding rod 34 will not rotate along its own circumferential direction.

[0057] The end face of a sliding hinge seat 16 located at the top is coaxially connected to a connecting ring 24 by means of screws, and a plug rod 31 is vertically fixed to the end face of the connecting ring 24. A clearance groove for the plug rod 31 to pass freely is provided on the top face of the fixed arm 23, and a slope 35 is provided at the lower end of the plug rod 31. A ball 36 is rotatably embedded at the end of the sliding rod 34 away from the gap compensation block 25. The ball 36 cooperates with the slope 35. When the sliding hinge seat 16 moves toward the direction of the rotating sleeve 30, the plug rod 31 will gradually be inserted into the clearance groove, and then the ball 36 will roll on the slope 35 of the plug rod 31, so that the ball 36 is squeezed by the slope 35, and then the ball 36 drives the sliding rod 34 to move in the direction away from the rotating shaft 10;

[0058] An annular mounting groove is provided on the top surface of the detection seat 8, and a ring gear 18 is rotatably connected to the annular mounting groove through a mounting bearing. A mounting column 41 is vertically penetrated on the upper end surface of the annular gear 18, and a sliding seat 27 is fixedly connected to the upper end of the mounting column 41. A storage groove is provided on the top surface of the sliding seat 27, and a sliding block 44 is mounted in the storage groove. A plug hole is provided on the top surface of the sliding block 44, and a lever dial indicator 22 is installed on the upper surface of the sliding block 44. Specifically, the clamping handle of the lever dial indicator 22 (a structural component of the lever dial indicator 22 itself) is inserted into the plug hole, and convex strips 43 are fixedly connected to the outer walls on both sides of the sliding block 44. A strip groove 42 for the convex strip 43 to engage is provided on the surface of the sliding seat 27, and the convex strip 43 slides freely horizontally in the strip groove 42. A driving rod 45 is horizontally fixedly connected to the end of the sliding block 44 away from the sealing member 9, and the driving rod 45 passes through the sliding seat 27 and slides freely.

[0059] One end of the driving rod 45 passing through the sliding seat 27 is fixedly sleeved with a limit ring 39, and a spring 40 is sleeved around the periphery of the driving rod 45. The two ends of the spring 40 in the elastic force direction elastically press against the limit ring 39 and the sliding seat 27 respectively. The top surface of the detection seat 8 is connected with the annular seat 7 by screws. The sealing member 9 is located on the inner side of the annular hole of the annular seat 7. The inner wall of the annular hole of the annular seat 7 is provided with a plurality of notched grooves 37. When the ring gear 18 rotates, the end of the driving rod 45 passing through the sliding seat 27 alternately slides and contacts the inner wall of the annular hole of the annular seat 7 and the inner wall of the notched groove 37. Furthermore, the end of the driving rod 45 passing through the sliding seat 27 is fixedly connected with a ball head 38. The ball head 38 contacts the inner wall of the annular hole of the annular seat 7 and the inner wall of the notch groove 37, thereby reducing the wear of the end of the driving rod 45. The probe of the lever dial indicator 22 is in contact with the upper surface of the seal 9. The bottom of the detection seat 8 is installed with a driving motor 3. The motor shaft of the driving motor 3 passes through the detection seat 8 and is drivingly connected with a driving gear 20. The driving gear 20 is externally meshed with the ring gear 18. The motor shaft of the driving motor 3 drives the driving gear 20 to rotate. The driving gear 20 is meshed with the ring gear 18 for transmission, so that the driving gear 20 drives the ring gear 18 to rotate, and then the ring gear 18 rotates around its own axis.

[0060] Furthermore, a locking ring is fixedly sleeved on the periphery of a sliding hinge seat 16 located below, and a plurality of stop rods 21 are vertically fixedly connected to the lower end face of the locking ring. A fixing plate 2 is horizontally fixedly connected to the outer wall of the base 1, and a through hole is opened on the fixing plate 2 for the stop rod 21 to pass freely. When the stop rod 21 is inserted into the through hole, the sliding hinge seat 16 can be in a circumferentially limited state, so that when the rotating shaft 10 rotates, the threads of the nut sleeve 15 and the threaded section 17 are screwed together, and the sliding hinge seat 16 will not rotate with it.

[0061] The working principle of this embodiment is as follows:

[0062] The seal 9 is placed in the seal limit groove, and the clamping handle of the lever dial gauge 22 is inserted into the insertion hole of the sliding block 44, and then the lever dial gauge 22 is installed on the sliding block 44, so that the lever dial gauge 22 will not interfere with the seal 9 during the process of installing the seal 9 in the seal limit groove. The lifting cylinder 11 is started, and the cylinder rod of the lifting cylinder 11 is shortened, thereby driving the lifting seat 6 to move downward, so that the rotating shaft 10 moves downward, and the rotating shaft 10 is moved by the seal. The detection seat 8 is provided with a through hole for the rotating shaft 10 to pass freely. When the rotating shaft 10 moves downward, it drives the sliding hinge seat 16 and the hinge rod 12 to move downward. After the rotating shaft 10 moves downward to the right position, the two sliding hinge seats 16 are respectively located above and below the sealing member 9, and the inner support arc block 19 corresponds to the sealing member 9. In addition, the stop rod 21 is inserted into the through hole of the fixing plate 2, and the sliding hinge seat 16 is circumferentially limited by the stop rod 21.

[0063] Then, the servo motor 5 is started, and the motor shaft of the servo motor 5 rotates, and drives the rotating shaft 10 to rotate. When the rotating shaft 10 rotates, the nut sleeve 15 is driven to be threadedly screwed on the threaded segment 17. During the threaded screwing process, since the threaded rotation directions of the two threaded segments 17 are opposite, the two nut sleeves 15 move relatively close to each other, and the hinge rods 12 on the two sliding hinge seats 16 swing in the direction away from the rotating shaft 10, and then drive the four inner support arc blocks 19 to move in the direction of the sealing member 9. The outer arc surface of the inner support arc block 19 contacts the inner wall of the annular hole of the sealing member 9, and with the movement of the inner support arc block 19, the inner wall of the annular hole of the sealing member 9 is squeezed by the inner support arc block 19 and is in a stretched state;

[0064] When the two sliding hinge seats 16 are in relative close motion, the connecting ring 24 will move toward the rotating sleeve 30, so that the lower end of the insertion rod 31 begins to be inserted into the avoidance groove of the fixed arm 23, and the inclined surface 35 of the insertion rod 31 begins to contact the ball 36. When the ball 36 contacts the inclined surface 35, the inclined surface 35 exerts an extrusion force on the ball 36 in the direction away from the rotating shaft 10, so that the ball 36 drives the sliding rod 34 to move, and then the gap compensation block 25 moves in the direction of the inner support arc block 19. There is a V-shaped groove 26 between the opposite surfaces, so that the gap compensation block 25 will not come into contact with the inner arc block 19 when the two inner arc blocks 19 are not moved into place. After the rotation of the rotating shaft 10 stops, the inner arc block 19 moves into place, and the gap compensation block 25 is engaged in the gap between the two adjacent inner arc blocks 19, so that the outer arc surface of the gap compensation block 25 and the outer arc surface of the inner arc block 19 form a complete circumferential surface together, thereby generating a uniform extrusion force on the annular hole of the sealing member 9, so that the sealing member 9 is uniformly expanded;

[0065] Start the external compressed air equipment, which delivers compressed air of fixed pressure from the air inlet 14 to the inner cavity of the air inlet seat 13. The compressed air then enters the inner cavity of the inner arc block 19 through the air pipe, and is ejected from the air outlet 29 to the inner wall of the annular hole of the seal 9 and the contact surface of the inner arc block 19. If the seal 9 still has good contraction force after being stretched, the seal 9 still has a sealing effect on the surface of the inner arc block 19, so that the compressed air cannot escape from the inner wall of the annular hole of the seal 9 and the contact surface of the inner arc block 19, and the air pressure indicated by the barometer 4 is the delivery pressure of the compressed air equipment. On the contrary, if the air pressure indicated by the barometer 4 is less than the delivery pressure, it means that the contraction force of the seal 9 after being stretched is poor and the sealing performance is reduced.

[0066] After the seal 9 is opened by the inner support arc block 19, the drive motor 3 is started, and the motor shaft of the drive motor 3 drives the active gear 20 to rotate. The active gear 20 and the ring gear 18 are meshed and transmitted, so that the ring gear 18 rotates around its own axis. When the ring gear 18 rotates, the lever dial indicator 22 is driven to rotate, so that the probe of the lever dial indicator 22 detects the flatness of the upper surface of the seal 9. With the rotation of the ring gear 18 and the elastic resistance force of the spring 40 on the limit ring 39, the ball head 38 at the end of the drive rod 45 will slide alternately on the inner wall of the ring hole of the annular seat 7 and the inner wall of the notch groove 37. Specifically, when the ball head 38 slides from the inner wall of the ring hole of the annular seat 7 to the inner wall of the notch groove 37, the elastic resistance force of the spring 40 on the limit ring 39 causes the drive rod 45 to rotate. The sliding block 44 is driven to move toward the radial outer side of the annular seat 7, so that the lever dial indicator 22 moves toward the radial outer side of the annular seat 7. As the annular gear 18 rotates, the ball head 38 will slide from the inner wall of the notch groove 37 to the inner wall of the annular hole of the annular seat 7. The inner wall of the annular hole of the annular seat 7 produces an extrusion force on the ball head 38, so that the ball head 38 drives the sliding block 44 to move in the opposite direction, and drives the lever dial indicator 22 to move in the opposite direction. As a result, when the annular gear 18 rotates, the movement trajectory of the probe of the lever dial indicator 22 on the upper surface of the seal 9 is a circular trajectory surrounded by wavy lines, so that the lever dial indicator 22 can detect the flatness of the upper surface of the seal 9 after stretching, so as to detect whether the surface (end face) of the seal 9 has poor flatness after being stretched and affects the sealing performance.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A tensile strength testing device for rubber and plastic seals, characterized in that: include: A base (1) and a detection seat (8) fixedly connected to the top of the base (1), wherein a sealing member limiting groove is provided on the top surface of the detection seat (8), and a sealing member (9) is placed in the sealing member limiting groove; A lifting seat (6) is arranged above the detection seat (8), and the lifting seat (6) is driven to move vertically by a lifting driving element installed on the detection seat (8); A rotating shaft (10) vertically rotatably connected to the bottom of the lifting seat (6); A plurality of expansion components are arranged in an axial array on the periphery of the rotating shaft (10) along the rotating shaft (10), the expansion components are connected to inner arc support blocks (19), and the expansion components are used to drive the inner arc support blocks (19) to move in a direction away from the rotating shaft (10), so that the outer arc surface of the inner arc support block (19) contacts the annular wall of the sealing member (9) and expands the sealing member (9); A plurality of gap compensation components are arranged on the periphery of the rotating shaft (10), and the gap compensation components are used to fill the gap between two adjacent inner support arc blocks (19).

2. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The lifting drive element comprises ear plates fixedly connected to the outer walls of both sides of the lifting seat (6), and a lifting cylinder (11) is vertically installed on both sides of the detection seat (8), and the cylinder rod ends of the two lifting cylinders (11) are respectively fixedly connected to the two ear plates.

3. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The support assembly comprises two sliding hinges (16) respectively slidably mounted on the two ends of the rotating shaft (10); a hinge rod (12) is hinged at the periphery of the sliding hinge (16); one end of the hinge rod (12) away from the sliding hinge (16) is correspondingly hinged to the outer wall of the inner support arc block (19); and a driving unit for driving the two sliding hinges (16) to move relative to each other is provided at the periphery of the rotating shaft (10).

4. The tensile strength testing device for rubber and plastic seals according to claim 3, characterized in that: The driving unit comprises a nut sleeve (15) embedded in the sliding hinge seat (16); a threaded section (17) is respectively provided at both axial ends of the rotating shaft (10); the threaded rotation directions of the two threaded sections (17) are opposite; the two nut sleeves (15) are respectively threadedly mounted on the two threaded sections (17); a servo motor (5) is installed on the lifting seat (6); and the motor shaft of the servo motor (5) is drivingly connected to the rotating shaft (10).

5. The tensile strength testing device for rubber and plastic seals according to claim 3, characterized in that: The gap compensation component includes a rotating sleeve (30) which is coaxially rotatably sleeved on the periphery of the rotating shaft (10), a plurality of fixed arms (23) are fixedly connected to the periphery of the rotating sleeve (30), a sliding rod (34) is horizontally slidably passed through one end of the fixed arm (23) away from the rotating sleeve (30), and a gap compensation block (25) is fixedly connected to one end of the sliding rod (34) passing through the fixed arm (23), a tension spring (28) is wound around the periphery of the sliding rod (34), and two ends of the tension spring (28) are respectively fixedly connected to the gap compensation block (25) and the surface of the fixed arm (23), and a moving unit is provided on the fixed arm (23) for driving the gap compensation block (25) to move in the gap direction between two adjacent inner support arc blocks (19) when the inner support arc block (19) opens the sealing member (9).

6. The tensile strength testing device for rubber and plastic seals according to claim 5, characterized in that: The movable unit comprises a connecting ring (24) connected to the end face of one of the sliding hinge seats (16); the end face of the connecting ring (24) is vertically fixed with an insertion rod (31); the top surface of the fixed arm (23) is provided with a clearance groove for the insertion rod (31) to pass freely; the lower end of the insertion rod (31) is provided with an inclined surface (35); the end of the sliding rod (34) away from the gap compensation block (25) is rotatably embedded with a ball (36); the ball (36) is used in conjunction with the inclined surface (35).

7. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The bottom surface of the lifting seat (6) is connected to an air inlet seat (13); the air inlet seat (13) is hollow inside and a pressure gauge (4) is installed on the outer wall; the outer wall of the air inlet seat (13) is provided with an air inlet port (14); the inner support arc block (19) is hollow inside and a plurality of air outlet holes (29) are opened on the outer arc surface; the inner support arc block (19) and the air inlet seat (13) are connected via an air pipe, so that the inner cavity of the inner support arc block (19) and the inner cavity of the air inlet seat (13) are in a connected state.

8. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The top surface of the detection seat (8) is rotatably connected to a ring gear (18), the upper end surface of the ring gear (18) is equipped with a lever dial indicator (22), the probe of the lever dial indicator (22) is in contact with the upper surface of the sealing member (9), and the bottom of the detection seat (8) is equipped with a driving motor (3), the motor shaft of the driving motor (3) passes through the detection seat (8) and is drivingly connected to a driving gear (20), and the driving gear (20) is externally meshed with the ring gear (18).

9. The tensile strength testing device for rubber and plastic seals according to claim 8, characterized in that: The upper end surface of the ring gear (18) is vertically penetrated with a mounting column (41), and the upper end of the mounting column (41) is fixedly connected to a sliding seat (27). The top surface of the sliding seat (27) is provided with a receiving groove, and a sliding block (44) is mounted in the receiving groove. The top surface of the sliding block (44) is provided with an insertion hole, and the clamping handle of the lever dial indicator (22) is inserted into the insertion hole. The outer walls of both sides of the sliding block (44) are fixedly connected with convex strips (43). The surface of the sliding seat (27) is provided with a strip groove (42) for the convex strip (43) to be engaged, and the convex strip (43) slides freely horizontally in the strip groove (42). The end of the sliding block (44) away from the sealing member (9) is horizontally fixedly connected with a driving rod (45). ), the driving rod (45) passes through the sliding seat (27) and slides freely, one end of the driving rod (45) passing through the sliding seat (27) is fixedly sleeved with a limit ring (39), a spring (40) is sleeved around the periphery of the driving rod (45), and the two ends of the spring (40) in the elastic force direction elastically press against the limit ring (39) and the sliding seat (27) respectively, the top surface of the detection seat (8) is connected with an annular seat (7), and the inner wall of the annular hole of the annular seat (7) is provided with a plurality of notched grooves (37), when the annular gear (18) rotates, the end of the driving rod (45) passing through the sliding seat (27) alternately slides and contacts the inner wall of the annular hole of the annular seat (7) and the inner wall of the notched groove (37).

10. A tensile strength testing process for rubber and plastic seals, applied to the tensile strength testing equipment according to any one of claims 1 to 9, characterized in that: include: The sealing member (9) is placed in the sealing member limiting groove, and the lifting seat (6) is driven downward by the lifting driving element so that the rotating shaft (10) passes through the sealing member (9); The expansion assembly drives the plurality of inner arc support blocks (19) to move in a direction away from the rotating shaft (10), and the outer arc surfaces of the inner arc support blocks (19) contact the annular wall of the sealing member (9); After the inner arc support block (19) moves to a fixed stroke, the gap compensation component will be triggered to fill the gap between two adjacent inner arc support blocks (19), so that the outer arc surfaces of the multiple inner arc support blocks (19) form a complete circular surface, thereby expanding the seal (9).