CN110940470B - Rubber seal performance testing device - Google Patents
Rubber seal performance testing device Download PDFInfo
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- CN110940470B CN110940470B CN201910977936.2A CN201910977936A CN110940470B CN 110940470 B CN110940470 B CN 110940470B CN 201910977936 A CN201910977936 A CN 201910977936A CN 110940470 B CN110940470 B CN 110940470B
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- ring
- force sensor
- sealing
- loading rod
- cavity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device for testing the performance of a rubber sealing ring; the sealing cavity is connected with the gland through a flange, a groove is formed in the flange, and a sealing element transition ring is arranged in the groove; the transition ring shares the same sealing cavity and is used for measuring sealing rings with different structural parameters. The central part of the pressure cover is provided with a force sensor which is connected with a display instrument and is contacted with the loading rod through a pressure head. Rotating the load lever clockwise causes it to move the pressure sensor downward, causing the gland to move downward. By determining the angle of rotation of the load bar threads, the distance the load bar moves downward can be determined. In the measuring process, the performance test of rubber sealing rings with different structures and sizes on the same test bed can be realized by replacing transition rings with different sizes. By pressurizing the sealing cavity, the static bearing reaction force test, the static contact width test and the air pressure test of the rubber sealing ring can be carried out. The real use environment of the sealing ring can be simulated, and the accuracy of the test result is improved.
Description
Technical Field
The invention relates to a testing device, in particular to a device for testing the performance of a rubber sealing ring.
Background
The rubber sealing ring is widely applied to sealing positions of internal combustion engines, automobiles, engineering machinery, machine tools, various hydraulic and pneumatic elements and the like with the advantages of low cost, simple structure, convenient installation and use and the like, can bear the sealing of fixed, reciprocating and rotary motion, has very strong adaptability, and has good dimensional stability and the capability of keeping elasticity for a long time under the common use condition. The O-shaped rubber sealing ring accounts for more than 50 percent in the sealing of mechanical products. With the higher and higher requirements of the automobile industry, the aerospace industry, the military industry and the oil exploitation industry on sealing, the environmental pollution, the casualties and the resource waste which are possibly brought by the sealing failure are more and more emphasized. Elastomeric seals rely on the elasticity and incompressibility of the seal material and the presence of initial interference or precompression, but the sealing conditions become severe due to structural vibrations, high temperatures and pressures, etc., resulting in leakage. Therefore, the research on the sealing performance of the rubber sealing ring is very important.
In the text (297-300 pages) of the prejudgment method research on the sealing performance of the rubber sealing ring published by the profession et al in 2016 (rubber industry), journal and journal 63, the compression performance testing device for the rubber sealing ring is provided, and can be used for researching the relationship between the axial pressure, the radial pressure and the strain of the rubber sealing ring, but the testing device is complex in test and high in manufacturing cost, and has a single structural form and size aiming at the rubber sealing ring, and the real pressure environment of the sealing ring cannot be simulated.
Disclosure of Invention
In order to avoid the defects in the prior art, the invention provides a rubber sealing ring performance testing device.
The invention solves the technical problem by adopting the technical scheme that the device comprises a foot nail, a sealing cavity, a support rod, a transition ring, a gland, a force sensor, a pressure head, a top cover bolt, a force applying rod, an angle pointer, a force sensor display instrument, an O-shaped sealing ring, a pressure gauge, an adapter, a valve, a loading rod and a tested sealing ring, and is characterized in that the sealing cavity is connected with the gland through a flange at the upper end part of the sealing cavity, a groove is formed in the circumferential direction of the flange at the upper end of the sealing cavity, the sealing ring transition ring is installed in the groove, a rubber sealing ring to be tested is installed in the sealing ring transition ring, and the O-shaped sealing ring is installed on the side wall of the transition ring; the transition rings with different structural parameters can share the same sealing cavity; the sealed cavity is fixed on the test table board through four foot nails and support rods;
the force sensor is positioned on the upper part of the gland, and a pressure head is arranged at the central position of the upper part of the force sensor; one end of the loading rod penetrates through a central screw hole of the top cover to be in contact with a pressure head on the upper part of the force sensor, and the other end of the loading rod is fixedly connected with the force applying rod; the force sensor is connected with the display instrument to form a force acquisition system for measuring the support reaction force of the sealing ring; the bearing reaction force borne by the tested sealing ring can be displayed in real time;
the lower section of the loading rod is of a threaded structure, an angle is engraved on the top cover according to the circumferential direction of the central screw hole and is used for indicating the rotating angle pointer to be fixed on the stressing rod, and the downward moving distance of the loading rod can be determined by determining the rotating angle of the loading rod;
the sealed cavity is connected with the pressure gauge through the adapter, the pressure gauge is located one side of the adapter, an air source on-off valve is installed on the other side of the adapter and communicated with an air source, and pressure in the sealed cavity can be kept by controlling on-off of the air source and numerical display of the pressure gauge.
The upper part of the pressure head is hemispherical, the lower part of the pressure head is a cylinder, and the force of the loading rod in point contact with the pressure head is uniformly transmitted to the force sensor; and the center of the loading rod, the pressure head, the force sensor and the center of the top cover are positioned on the same straight line.
Advantageous effects
The invention provides a rubber seal ring performance testing device which comprises a foot nail for fixing a testing device, a seal cavity with a flange plate, a supporting rod for connecting the seal cavity with a top cover, a pressure head for connecting a force sensor and a loading rod, a pointer fixed on a stress application rod for indicating a rotating angle, an adapter for connecting the seal cavity with a pressure gauge and a valve. The sealing cavity is connected with the gland through a flange, a groove is formed in the flange, and a sealing element transition ring is arranged in the groove. The main function of the transition ring is to share the same sealing cavity and measure sealing rings with different structural parameters. A force sensor is arranged in the center of the pressing cover and connected with a display instrument, and the force sensor is connected with the loading rod through a pressing head. The loading rod is rotated clockwise to move the loading rod downwards, and the loading rod pushes the force sensor downwards, so that the gland moves downwards. By determining the angle of rotation of the load bar threads, the distance the load bar moves downward can be determined. In the measuring process, the performance test of rubber sealing rings with different structures and different sizes on the same test bed can be realized by replacing transition rings with different sizes, so that the problems of complex structure and single function of the existing sealing ring test equipment are solved; by pressurizing the seal cavity, the real use environment of the seal ring can be simulated, and the accuracy of the test result is improved.
Drawings
The following describes a device for testing the performance of a rubber seal ring according to the present invention in further detail with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic view of a device for testing the performance of a rubber sealing ring according to the present invention.
Fig. 2 is a schematic view of a top cover with an angled portion in the device for testing the performance of a rubber sealing ring according to the present invention.
In the drawings
1. Foot nail 2, seal cavity 3, support rod 4, transition ring 5, measured seal ring 6, gland 7, force sensor 8, pressure head
9. Top cover 10, top cover bolt 11, loading rod 12, stress application rod 13, angle pointer 14 and force sensor display instrument
15O-shaped sealing ring 16, adapter 17, pressure gauge 18 and valve
Detailed Description
The embodiment is a rubber seal ring performance testing device.
Referring to fig. 1 and 2, the device for testing the performance of the rubber sealing ring in the embodiment is composed of a foot nail 1, a sealing cavity 2, a support rod 3, a transition ring 4, a gland 6, a force sensor 7, a pressure head 8, a top cover 9, a top cover bolt 10, a stress application rod 12, an angle pointer 13, a force sensor display instrument 14, an O-shaped sealing ring 15, a pressure gauge 17, an adapter 16, a valve 18, a loading rod 11 and a tested sealing ring 5; the sealed cavity is fixed on the test table board through four foot nails 1 and supporting rods. The sealing cavity 2 is connected with the gland 6 through a flange at the upper end part of the sealing cavity, a groove is formed in the circumferential direction of the flange at the upper end of the sealing cavity, a sealing ring transition ring 4 is installed in the groove, a rubber sealing ring to be tested is installed in the sealing ring transition ring, and an O-shaped sealing ring is installed on the side wall of the transition ring; the transition rings 4 with different structural parameters can share the same sealing cavity 2 to measure the sealing rings 5 with different structural parameters. In the measuring process, the sealing performance of the sealing rings with different structural forms can be measured only by replacing the size of the transition ring 4 according to the requirement. The sealed cavity is fixed on the test table board through four foot nails and supporting rods.
The force sensor 7 is positioned at the upper part of the gland 6, and the central position of the upper part of the force sensor 7 is provided with a pressure head 8; one end of the loading rod passes through a central screw hole of the top cover to be contacted with a pressure head 8 at the upper part of the force sensor 7, and the other end of the loading rod 11 is fixedly connected with a stress application rod 12; the force sensor 7 is connected with the display instrument 14 to form a force acquisition system for measuring the support reaction force of the sealing ring; the bearing reaction force of the tested sealing ring can be displayed in real time.
The lower section of the loading rod 11 is of a threaded structure, an angle is engraved on the top cover 9 according to the circumferential direction of the central screw hole and is used for indicating the rotating angle pointer 13 to be fixed on the stressing rod 11, and the downward moving distance of the loading rod 11 can be determined by determining the rotating angle of the loading rod 11. The sealed cavity 2 is connected with a pressure gauge 17 through an adapter 16, the pressure gauge 17 is positioned on one side of the adapter, an air source on-off valve 18 is installed on the other side of the adapter 16 and communicated with an air source, and pressure in the sealed cavity can be kept by controlling on-off of the air source and numerical display of the pressure gauge.
In the embodiment, the upper part of the pressure head 8 is hemispherical, the lower part of the pressure head 8 is cylindrical, and the force of the loading rod in point contact with the pressure head 8 is uniformly transmitted to the force sensor; and the center of the loading rod, the pressure head and the force sensor and the center of the top cover 9 are positioned on the same straight line. The lower end of the loading rod 11 is provided with threads, and the gland 6 moves downwards by rotating the loading rod clockwise and the force sensor 7 under the loading rod. The top cover 9 is provided with an angle, a pointer 13 for indicating the rotation angle is fixed on the stress application rod 12, and the downward moving distance of the loading rod can be determined by determining the rotation angle of the thread of the loading rod.
When static test thrust force, correctly place the sealing washer 5 that awaits measuring in suitable transition ring 4, cover gland 6, assemble force transducer 7, pressure head 8, top cap 9 in proper order, accomplish test device and adjust for when pressure head and force transducer will contact and not contact, the reading of force transducer display is 0. In order to obtain a complete data table of the bearing forces at different compression ratios, the loading rod is rotated at an angular velocity of 30 ° each time, and the data at this time is recorded as the bearing force at the compression ratio until the two flange seal surfaces are in contact after the force sensor display data is stabilized.
When the contact width is statically tested, the sealing ring 5 to be tested is correctly placed in the proper transition ring 4, carbon paper and white paper with proper sizes are sequentially placed on the transition ring, the gland 6 is covered, the force sensor 7, the pressure head 8 and the top cover 9 are installed, and the adjustment of the experimental device is completed. And calculating the downward rotation distance of the loading rod according to the preset compression ratio, and then obtaining the rotation angle according to the downward rotation distance. The loading rod is rotated clockwise to meet the angle requirement, and the reading of the force sensor display is stable. The experimental device is disassembled, the carbon paper is taken out, and the contact width of the sealing ring under the compression ratio is measured.
During a sealing ring air pressure test, a sealing ring 5 to be tested is correctly placed in a proper transition ring 4, a gland 6 is covered, a force sensor 7, a pressure head 8 and a top cover 9 are sequentially assembled, different pressures of a sealing cavity are set by controlling the on-off of an air source and the numerical value display of a pressure gauge, and then the attenuation relation of the sealing ring under the preset compression ratio and the pressures of the different sealing cavities along with time can be obtained.
Claims (2)
1. A rubber seal ring performance testing device comprises foot nails, a seal cavity, a supporting rod, a transition ring, a gland, a force sensor, a pressure head, a top cover bolt, a force application rod, an angle pointer, a force sensor display instrument, an O-shaped seal ring, a pressure gauge, an adapter, a valve, a loading rod and a tested seal ring, and is characterized in that the seal cavity is connected with the gland through a flange at the upper end part of the seal cavity, a groove is circumferentially formed in a flange at the upper end of the seal cavity, the seal ring transition ring is installed in the groove, the rubber seal ring to be tested is installed in the seal ring transition ring, and the O-shaped seal ring is installed on the side wall of the transition ring; the transition rings with different structural parameters can share the same sealing cavity; the sealed cavity is fixed on the test table board through four foot nails and support rods;
the force sensor is positioned on the upper part of the gland, and a pressure head is arranged at the central position of the upper part of the force sensor; one end of the loading rod penetrates through a central screw hole of the top cover to be in contact with a pressure head on the upper part of the force sensor, and the other end of the loading rod is fixedly connected with the force applying rod; the force sensor is connected with the display instrument to form a force acquisition system for measuring the support reaction force of the sealing ring; the bearing reaction force borne by the tested sealing ring can be displayed in real time;
the lower section of the loading rod is of a threaded structure, an angle is engraved on the top cover according to the circumferential direction of the central screw hole and is used for indicating the rotating angle pointer to be fixed on the stressing rod, and the downward moving distance of the loading rod can be determined by determining the rotating angle of the loading rod;
the sealed cavity is connected with the pressure gauge through the adapter, the pressure gauge is located one side of the adapter, an air source on-off valve is installed on the other side of the adapter and communicated with an air source, and pressure in the sealed cavity can be kept by controlling on-off of the air source and numerical display of the pressure gauge.
2. The device for testing the performance of the rubber sealing ring according to claim 1, wherein the upper part of the pressure head is hemispherical, the lower part of the pressure head is cylindrical, and the force of the loading rod in point contact with the pressure head is uniformly transmitted to the force sensor; and the center of the loading rod, the pressure head, the force sensor and the center of the top cover are positioned on the same straight line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910977936.2A CN110940470B (en) | 2019-10-15 | 2019-10-15 | Rubber seal performance testing device |
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|---|---|---|---|
| CN201910977936.2A CN110940470B (en) | 2019-10-15 | 2019-10-15 | Rubber seal performance testing device |
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| CN110940470A CN110940470A (en) | 2020-03-31 |
| CN110940470B true CN110940470B (en) | 2021-10-26 |
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| CN112304530B (en) * | 2020-10-29 | 2021-08-17 | 清华大学 | Inner inclination angle testing device capable of analyzing influence of O-shaped ring section diameter on high-pressure sealing performance |
| CN112710269A (en) * | 2021-01-07 | 2021-04-27 | 哈尔滨工业大学 | Rubber thickness gauge |
| CN114061851B (en) * | 2021-10-12 | 2023-11-14 | 中核核电运行管理有限公司 | Self-sealing type metal sealing ring performance test system and method |
| CN113933196B (en) * | 2021-10-14 | 2023-04-07 | 清华大学 | Testing device for sealing element |
| CN114112689B (en) * | 2021-11-18 | 2023-07-04 | 宣城市健龙橡塑密封件有限公司 | Tensile strength detection equipment based on rubber and plastic sealing piece production system |
| CN114486092B (en) * | 2022-01-03 | 2022-11-08 | 浙江大学 | Test device for testing performance of non-metal sealing element in high-pressure hydrogen environment |
| CN114441104B (en) * | 2022-01-03 | 2022-11-08 | 浙江大学 | Method for testing performance of non-metal sealing piece in high-pressure hydrogen environment |
| CN117091766B (en) * | 2023-08-23 | 2024-03-08 | 东莞市鹏锦机械科技有限公司 | Detection device and detection method for teflon sealing strip |
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