CN109596435B - Test method for testing external pressure crushing resistance of filter element - Google Patents
Test method for testing external pressure crushing resistance of filter element Download PDFInfo
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- CN109596435B CN109596435B CN201811624581.0A CN201811624581A CN109596435B CN 109596435 B CN109596435 B CN 109596435B CN 201811624581 A CN201811624581 A CN 201811624581A CN 109596435 B CN109596435 B CN 109596435B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0087—Resistance to crushing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
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Abstract
A test method for testing the external pressure and crushing resistance of a filter element comprises four steps of installation, preparation before pressurization, pressurization test and data processing. The test method is reasonable and simple to operate, the relation between the deformation of the filter element and the external pressure is obtained through tests, certain requirements are set on the use conditions and the environment of the automatic backwashing filter according to the relation between the deformation of the filter element and the external pressure, or a device for preventing the external pressure from being too high is added in the automatic backwashing filter, or the structure or the material of the filter element is improved to obtain higher compressive strength, so that the use fault of the automatic backwashing filter caused by the crushing of the filter element in the use process is avoided.
Description
Technical Field
The invention relates to a test method for testing the external pressure and crushing resistance of a filter element, which belongs to the field of water treatment.
Background
At present, the automatic backwashing filter is widely applied to industries such as power plants, oceans, petrochemical industry and the like. The automatic back-flushing filter mainly comprises a filter element part, a dirt absorbing part and a transmission part, wherein the filter element part belongs to an important part of the filter, and the working capacity of the filter is directly influenced by the performance of the filter element part.
The water inlet of the automatic back-washing filter is directly connected with the inlet water valve, the other end of the inlet water valve is connected with the water inlet pump, the water outlet of the automatic back-washing filter is directly connected with the outlet valve, and the inlet water valve and the outlet water valve are multipurpose electric valves or pneumatic valves without position feedback signals. When the filter is started and closed, the inlet water valve and the outlet water valve are opened and closed, and water flow easily generates a large acting force on the filter element of the filter to form a water hammer effect. The following hazards exist to the automatic backwash filter after the water hammer effect is formed: 1 accelerating the abrasion of the suction nozzle; 2, the framework and the filter screen of the filter element deform, and if the pressure is too high, the filter element deforms seriously and is crushed; wherein the serious deformation and even the crushing of the filter element can cause great influence on the working capacity of the dirt absorbing transmission structure in the automatic back-flushing filter.
In order to avoid serious damage to the filter element caused by the water hammer effect, the performance parameters of the filter element for resisting external pressure collapse need to be obtained. At present, the domestic standard or patent only has a test method for testing the internal pressure and crushing resistance of the filter element, and the test method for testing the external pressure and crushing resistance of the filter element is not specified.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, provides a test method for the relationship between the deformation of the filter element and the external pressure, which is simple to operate, has higher economic benefit and is convenient to measure, and provides a certain data support for the strength design and optimization of the filter element of the automatic backwashing filter and the use conditions thereof.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a test method for testing the external pressure crushing resistance of a filter element is characterized by comprising the following steps:
1) and (3) installation: wrapping a layer of waterproof film on the outer surface of the filter element, and then putting the lower end of the filter element into a test box of a test device; the testing device comprises a hollow tubular testing box with openings at two ends, and also comprises a circular lower end connecting plate sleeved at the lower end of the testing box, a circular upper end connecting plate sleeved at the upper end of the testing box, a lower end flange cover arranged on the lower end connecting plate, a lower end support ring fixedly connected to the lower end flange cover and a dial indicator for measuring the deformation of the filter element, wherein the lower end of the filter element is detachably arranged in the lower end support ring; then the upper end of the filter element is detachably arranged in an upper end support ring of the test device, the upper end support ring is fixedly connected with an upper end flange cover of the test device, and the upper end flange cover is fixedly connected with an upper end connecting plate to seal the upper ends of the filter element and the test box; a closed annular cavity is formed among the filter element, the lower end flange cover, the upper end flange cover and the inner wall of the test box, and a pressure gauge is arranged to measure the pressure in the annular cavity; the upper end flange cover is provided with a water inlet pipe and an exhaust pipe, the lower end flange cover is provided with a drain pipe, the water inlet pipe is connected with one end of a water inlet valve, the other end of the water inlet valve is connected with a booster pump, the exhaust pipe is connected with an exhaust valve, the drain valve is connected with the drain pipe, and the filter element is completely installed;
2) and preparation before pressurization: after the filter element is installed, closing the drain valve, opening the exhaust valve and the water inlet valve, injecting water into the annular cavity by using a booster pump to exhaust air in the annular cavity, closing the exhaust valve when water flows out of the exhaust valve, observing the reading of a pressure gauge, and adjusting the reading of the pressure gauge to be 0 Mpa;
3) and a pressure test: the booster pump continues to pressurize the annular cavity, the pressure in the annular cavity is the external pressure on the filter element, the reading of the pressure gauge is observed, when the pressure in the annular cavity increases by 0.09-0.11Mpa, the pressure is maintained for 10-20min, the reading of the dial indicator is observed, namely the deformation of the filter element after the pressurization for the time is carried out, and the record is carried out; until the reading of the dial indicator reaches the maximum deformation allowed by the filter element, the maximum deformation value is 1% of the outer diameter of the filter element, and the test is finished; then opening an exhaust valve, firstly relieving pressure, and opening a drain valve to drain water when the reading of an observation pressure gauge is 0Mpa until water in the annular cavity is drained; after the water is completely discharged, closing the exhaust valve and the drain valve;
4) and data processing: drawing a curve between the external pressure of the filter element and the deformation of the filter element: according to the data recorded in the step), drawing a curve between the external pressure of the filter element and the deformation of the filter element, taking the pressure at which the deformation of the filter element reaches the maximum deformation as the external pressure crushing resistance of the filter element, and recording and storing the test data.
Further, in step 1), before the outer surface of the filter element to be tested is wrapped with the waterproof film, circumferential grooves are formed in the two ends of the filter element, then the sealing rings are installed in the circumferential grooves wrapped with the waterproof film, and after the sealing rings are installed at the two ends of the filter element, the subsequent installation steps in step) are carried out.
Further, in step 1), after sealing rings are arranged at two ends of the filter element, two sealing gaskets are arranged on the end face of the lower end of the filter element, a water-proof film is clamped between the two sealing gaskets, two sealing gaskets are arranged on the end face of the upper end of the filter element, a water-proof film is clamped between the two sealing gaskets, the thicknesses of the four sealing gaskets are 2mm, and after the sealing gaskets are arranged at the two ends of the filter element, the subsequent installation step in the step) is carried out.
Further, the sealing ring is an o-shaped sealing ring.
Furthermore, the lower end flange cover in the step 1) is provided with a support rod, the filter element is sleeved outside the support rod, the four dial indicators are arranged and are all installed in the middle of the support rod, the four dial indicators uniformly surround the support rod in different circumferential directions, the measuring heads of the four dial indicators are adjusted, and the measuring heads are in contact with the inner surface of the filter element to measure the deformation of the filter element.
Further, the pressure gauge in the step 1) is arranged in the middle of the outer portion of the test box and is positioned on the same horizontal plane with the measuring heads of the four dial indicators.
Further, a support column fixedly connected to the lower end flange cover and a base plate fixedly connected to the lower end of the support column are arranged at the bottom of the test device which is not completely installed in the step 1).
Further, the waterproof film in the step 1) is made of plastic cloth.
Further, a circular sealing gasket is arranged between the lower end connecting plate and the lower end flange cover in the step 1), a circular sealing gasket is arranged between the upper end connecting plate and the upper end flange cover, and the thickness of the two sealing gaskets is 4 mm.
Through the technical scheme, the invention has the following beneficial effects:
aiming at the defects of the prior art, the invention provides a test method for testing the external pressure and crushing resistance of a filter element, which applies uniform external pressure load to the outer wall of the filter element by injecting water into a sealed annular cavity and pressurizing, measures the deformation of the filter element through a dial indicator and finally obtains the external pressure and crushing resistance of the filter element; considering that the core body of the filter element is permeable, a layer of waterproof film is wrapped outside the filter element, and the waterproof film has small resistance to pressure when the filter element is pressed and can be ignored; the magnitude of the external pressure load can be read out through a pressure gauge on the test box, the pressure caused by the self height difference of water in the annular cavity is considered, and in order to truly reflect the actual value of the pressure of the filter element, the pressure gauge is arranged in the middle of the test box and is positioned on the same horizontal plane with the deformation measuring point of the filter element; in order to measure the deformation of the filter element under the action of external pressure more objectively and truly and observe and record in real time, four dial indicators are arranged and placed in the middle of the filter element with larger deformation, and the dial indicators are uniformly distributed on the middle interface of the filter element in a circumferential manner.
The test method is reasonable and simple to operate, and the relation between the deformation of the filter element and the external pressure is obtained through tests; according to the relation between the deformation of the filter element and the external pressure, certain requirements are set on the use conditions and the environment of the automatic backwashing filter, or a device for preventing the external pressure from being too large is added in the automatic backwashing filter, or the structure or the material of the filter element is improved to obtain higher compressive strength, so that the use fault of the automatic backwashing filter caused by the crushing of the filter element in the use process is avoided.
Drawings
FIG. is a schematic cross-sectional view of a test device used in the present invention;
the second figure is an enlarged schematic diagram at the position I in the first figure;
FIG. three is an enlarged schematic view at II in FIG. one;
in the figure: 1. the device comprises a vent valve, 2, a vent pipe, 3, an upper end flange cover, 4, an upper end support ring, 5, an annular cavity, 6, a support rod, 7, a test box, 8, a pressure gauge, 9, a dial indicator, 10, a lower end flange cover, 11, a lower end support ring, 12, a drain pipe, 13, a drain valve, 14, a base plate, 15, a support column, 16, a lower end connecting plate, 17, a filter element, 18, a sealing ring, 19, a water-resisting film, 20, a sealing gasket, 21, an upper end connecting plate, 22, a water inlet pipe, 23, a water inlet valve, 24 and a booster pump.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in fig. 1, are only used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be taken as limiting the scope of the present invention.
The present invention will be described in further detail with reference to the drawings and the detailed description.
A test method for testing the external pressure crushing resistance of a filter element comprises the following steps:
1) and (3) installation: the method comprises the following steps of forming circumferential grooves at two ends of a filter element 17, wrapping a layer of waterproof film 19 on the outer surface of the filter element 17, arranging a sealing ring 18 into the circumferential groove wrapped with the waterproof film 19 by using plastic cloth for the waterproof film 19, arranging an o-shaped sealing ring for the sealing ring 18 at the two ends of the filter element 17, arranging two sealing gaskets 20 with the thickness of 2mm on the end surface of the lower end of the filter element 17, clamping the waterproof film 19 between the two sealing gaskets 20, arranging two sealing gaskets 20 with the thickness of 2mm on the end surface of the upper end of the filter element 17, clamping the waterproof film 19 between the two sealing gaskets 20, and then arranging the lower end of the filter element 17 into a test box 7 of a test device; the testing device comprises a hollow tubular testing box 7 with openings at two ends, a circular lower end connecting plate 16 sleeved at the lower end of the testing box 7, a circular upper end connecting plate 21 sleeved at the upper end of the testing box 7, a lower end flange cover 10 arranged on the lower end connecting plate 16, a circular sealing gasket 20 with the thickness of 4mm arranged between the lower end connecting plate 16 and the lower end flange cover 10, a lower end support ring 11 fixedly connected on the lower end flange cover 10, a support rod 6 fixedly connected on the lower end flange cover 10, four dial indicators 9 used for measuring the deformation of a filter element 17, a support column 15 fixedly connected on the lower end flange cover 10 and a backing plate 14 fixedly connected at the lower end of the support column 15, wherein the lower end of the filter element 17 is detachably arranged in the lower end support ring 11 and sleeved outside the support rod 6, and the four dial indicators 9 are all arranged at the middle position of the support rod 6, the four dial indicators 9 are uniformly surrounded on different circumferential directions of the support rod 6, measuring heads of the four dial indicators 9 are well adjusted, and the measuring heads are in contact with the surface of the filter element 17 to measure the deformation of the filter element 17; the upper end of a filter element 17 is installed in an upper end support ring 4 of a testing device, the upper end support ring 4 is fixedly connected with an upper end flange cover 3 of the testing device, the upper end flange cover 3 is fixedly connected with an upper end connecting plate 21 to seal the upper ends of the filter element 17 and a testing box 7, a closed annular cavity 5 is formed among the filter element 17, a lower end flange cover 10, the upper end flange cover 3 and the inner wall of the testing box 7, a pressure gauge 8 is arranged in the middle of the outer portion of the testing box 7 to measure the pressure in the annular cavity 5, and the pressure gauge 8 and measuring heads of four dial indicators 9 are positioned on the same horizontal plane; the upper end flange cover 3 is provided with a water inlet pipe 22 and an exhaust pipe 2, the lower end flange cover 10 is provided with a drain pipe 12, the water inlet pipe 22 is connected with one end of a water inlet valve 23, the other end of the water inlet valve 23 is connected with a booster pump 24, the exhaust pipe 2 is connected with an exhaust valve 1, a drain valve 13 is connected with the drain pipe 12, and the filter element 17 is completely installed;
2) and preparation before pressurization: after the filter element 17 is installed, closing the drain valve 13, opening the exhaust valve 1 and the water inlet valve 23, injecting water into the annular cavity 5 by using a booster pump 24 to exhaust air in the annular cavity 5, closing the exhaust valve 1 when water flows out of the exhaust valve 1, observing the reading of the pressure gauge 8, and adjusting the reading of the pressure gauge 8 to be 0 Mpa;
3) and a pressure test: the booster pump 24 continuously pressurizes the annular cavity 5, the pressure in the annular cavity is the external pressure on the filter element, the reading of the pressure gauge 8 is observed, when the pressure in the annular cavity 5 is increased by 0.1Mpa, the pressure is maintained for 15min, the reading of the dial indicator 9 is observed, namely the deformation of the filter element after the pressurization for the time is performed, and the record is made; until the reading of the dial indicator 9 reaches the maximum deformation allowed by the filter element 17, the maximum deformation value is 1% of the outer diameter of the filter element 17, and the test is finished; then opening the exhaust valve 1, firstly relieving pressure, and opening the drain valve 13 to drain water when the reading of the pressure gauge 8 is observed to be 0Mpa until the water in the annular cavity 5 is drained; after the water is completely discharged, closing the exhaust valve 1 and the drain valve 13;
4) and data processing: drawing a curve between the external pressure of the filter element and the deformation of the filter element: and (3) drawing a curve between the external pressure of the filter element 17 and the deformation of the filter element according to the data recorded in the step (3), taking the pressure at which the deformation of the filter element 17 reaches the maximum deformation as the external pressure and crushing resistance of the filter element 17, and recording and storing test data.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A test method for testing the external pressure crushing resistance of a filter element is characterized by comprising the following steps:
1) and (3) installation: wrapping a layer of waterproof film (19) on the outer surface of the filter element (17), and then putting the lower end of the filter element (17) into a test box (7) of a test device; the testing device comprises a hollow tubular testing box (7) with openings at two ends, and also comprises a circular lower end connecting plate (16) sleeved at the lower end of the testing box (7), a circular upper end connecting plate (21) sleeved at the upper end of the testing box (7), a lower end flange cover (10) arranged on the lower end connecting plate (16), a lower end supporting ring (11) fixedly connected to the lower end flange cover (10) and a dial indicator (9) for measuring the deformation of the filter element (17), wherein the lower end of the filter element (17) is detachably arranged in the lower end supporting ring (11); then the upper end of the filter element (17) is detachably installed in an upper end support ring (4) of the test device, the upper end support ring (4) is fixedly connected with an upper end flange cover (3) of the test device, and the upper end flange cover (3) is fixedly connected with an upper end connecting plate (21) to seal the upper ends of the filter element (17) and the test box (7); a closed annular cavity (5) is formed among the filter element (17), the lower end flange cover (10), the upper end flange cover (3) and the inner wall of the test box (7), and a pressure gauge (8) is arranged to measure the pressure in the annular cavity (5); a water inlet pipe (22) and an exhaust pipe (2) are arranged on the upper end flange cover (3), a drain pipe (12) is arranged on the lower end flange cover (10), the water inlet pipe (22) is connected with one end of a water inlet valve (23), the other end of the water inlet valve (23) is connected with a booster pump (24), the exhaust pipe (2) is connected with an exhaust valve (1), a drain valve (13) is connected with the drain pipe (12), and the filter element (17) is installed; the lower end flange cover (10) is provided with a support rod (6), a filter element (17) is sleeved outside the support rod (6), four dial indicators (9) are arranged and are all installed in the middle of the support rod (6), the four dial indicators (9) are uniformly arranged in different circumferential directions of the support rod (6) in a surrounding mode, measuring heads of the four dial indicators (9) are well adjusted and are in contact with the inner surface of the filter element (17) to measure the deformation of the filter element (17), the pressure gauge (8) is installed in the middle of the outer portion of the test box (7) and is located on the same horizontal plane with the measuring heads of the four dial indicators (9);
2) and preparation before pressurization: after the filter element (17) is installed, closing the drain valve (13), opening the exhaust valve (1) and the water inlet valve (23), injecting water into the annular cavity (5) by using a booster pump (24) to exhaust air in the annular cavity (5), closing the exhaust valve (1) when water flows out of the exhaust valve (1), observing the reading of the pressure gauge (8), and adjusting the reading of the pressure gauge (8) to be 0 Mpa;
3) and a pressure test: the booster pump (24) continues to pressurize the annular cavity (5), the pressure in the annular cavity is the external pressure on the filter element, the reading of the pressure gauge (8) is observed, when the pressure in the annular cavity (5) increases by 0.09-0.11Mpa, the pressure is maintained for 10-20min, the reading of the dial indicator (9) is observed, namely the deformation of the filter element after the pressurization for the time is carried out, and the record is carried out; until the reading of the dial indicator (9) reaches the maximum deformation allowed by the filter element (17), the maximum deformation value is 1 percent of the outer diameter of the filter element (17), and the test is finished; then opening the exhaust valve (1), firstly relieving pressure, and opening the drain valve (13) to drain water when the reading of the pressure gauge (8) is observed to be 0Mpa until the water in the annular cavity (5) is drained; after the water is completely discharged, closing the exhaust valve (1) and the drain valve (13);
4) and data processing: drawing a curve between the external pressure of the filter element and the deformation of the filter element: drawing a curve between the external pressure of the filter element (17) and the deformation of the filter element according to the data recorded in the step 3), taking the pressure at which the deformation of the filter element (17) reaches the maximum deformation as the external pressure crushing resistance of the filter element (17), and recording and storing test data.
2. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 1, wherein: in the step 1), before the outer surface of the filter element (17) is wrapped with the waterproof film (19), circumferential grooves are formed in two ends of the filter element (17), then the sealing ring (18) is installed in the circumferential groove wrapped with the waterproof film (19), and after the sealing ring (18) is installed at two ends of the filter element (17), the subsequent installation step in the step 1) is carried out.
3. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 2, wherein: in the step 1), after sealing rings (18) are installed at two ends of a filter element (17), two sealing gaskets (20) are placed on the end face of the lower end of the filter element (17), a water-resisting film (19) is clamped between the two sealing gaskets (20), the two sealing gaskets (20) are placed on the end face of the upper end of the filter element (17), the water-resisting film (19) is clamped between the two sealing gaskets (20), the thicknesses of the four sealing gaskets (20) are 2mm, and after the sealing gaskets are installed at the two ends of the filter element, the subsequent installation step in the step 1) is carried out.
4. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 2, wherein: the sealing ring (18) is an o-shaped sealing ring.
5. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 1, wherein: a supporting column (15) fixedly connected to the lower end flange cover (10) and a base plate (14) fixedly connected to the lower end of the supporting column (15) are arranged at the bottom of the test device which is not completely installed in the step 1).
6. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 1, wherein: the waterproof film (19) in the step 1) is made of plastic cloth.
7. A test method for testing the collapse resistance of a filter element against external pressure as claimed in claim 1, wherein: a circular sealing gasket (20) is arranged between the lower end connecting plate and the lower end flange cover in the step 1), a circular sealing gasket (20) is arranged between the upper end connecting plate and the upper end flange cover, and the thickness of the two sealing gaskets (20) is 4 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811624581.0A CN109596435B (en) | 2018-12-28 | 2018-12-28 | Test method for testing external pressure crushing resistance of filter element |
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| CN201811624581.0A CN109596435B (en) | 2018-12-28 | 2018-12-28 | Test method for testing external pressure crushing resistance of filter element |
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| CN109596435B true CN109596435B (en) | 2021-08-10 |
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| CN113281187A (en) * | 2021-06-25 | 2021-08-20 | 临海伟星新型建材有限公司 | Pipe pressure resistance testing device and testing method thereof |
| CN114001634B (en) * | 2021-10-12 | 2023-06-30 | 上海空间推进研究所 | Valve element deformation testing device and method |
| CN117949310A (en) * | 2024-01-17 | 2024-04-30 | 兰州理工大学 | Filter skeleton deformation amount measuring device |
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| CN106680074A (en) * | 2016-12-31 | 2017-05-17 | 天津赛达鑫源检验检测有限公司 | Equipment for crushing test of rubber pipe |
| CN206683965U (en) * | 2017-05-05 | 2017-11-28 | 天津市海王星海上工程技术股份有限公司 | A kind of non-adherent flexible pipe crush resistance measurement apparatus |
| CN108318343A (en) * | 2017-12-13 | 2018-07-24 | 中国石油天然气集团公司 | A kind of experimental rig and method of test tubing critical external compressive resistance disruption properties |
| CN207908259U (en) * | 2018-02-09 | 2018-09-25 | 中国石油大学(华东) | A kind of sealed connection connector and cable crushing test system |
| CN108918285B (en) * | 2018-08-30 | 2024-03-19 | 番禺珠江钢管（珠海）有限公司 | Pipe section crushing device and test method thereof |
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