CN106950109B - Automatic test device for bearing moment of groove type pipe joint for fire control - Google Patents
Automatic test device for bearing moment of groove type pipe joint for fire control Download PDFInfo
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- CN106950109B CN106950109B CN201710214605.4A CN201710214605A CN106950109B CN 106950109 B CN106950109 B CN 106950109B CN 201710214605 A CN201710214605 A CN 201710214605A CN 106950109 B CN106950109 B CN 106950109B
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Classifications
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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
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- 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
-
- 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
-
- 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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
-
- 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
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
-
- 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
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention relates to the technical field of product detection, in particular to an automatic test device for bearing moment of a groove type pipe joint for fire protection. Including water pressure control system, moment loading system, pipeline braced system, water receiving tank, seepage deformation detecting system, PLC controller, the internally mounted pipeline braced system of water receiving tank is installed subaerial, pipeline braced system includes the bracing piece of fixed mounting in the inside both ends of water receiving tank and the horizontal hauler of the upper portion installation of every bracing piece, install closed end pipeline on the horizontal hauler of one side, install the water inlet end pipeline on another horizontal hauler, be connected by slot type coupling test piece between closed end pipeline and the water inlet end pipeline, the top of slot type coupling test piece is provided with moment loading system, and the bottom of slot type coupling test piece is equipped with the seepage detection device, and water inlet end pipeline is connected with water pressure control system, and the work of PLC controller control water pressure control system, moment loading system and seepage deformation detecting system.
Description
Technical Field
The invention relates to the technical field of product detection, in particular to an automatic test device for bearing moment of a groove type pipe joint for fire protection.
Background
When the conventional groove type pipe joint bearing moment testing device for fire control is used, the operation of an experimenter is complex, the number of human interference factors is large, the detection quality and the efficiency are low, and the automatic testing device which is simple to operate and high in detection quality and is suitable for being specially used for the groove type pipe joint bearing moment for fire control does not exist.
Disclosure of Invention
The invention provides the automatic test device for the bearing moment of the groove type pipe joint for fire fighting, which has less manual operation and high automation degree, in order to make up the defects of the prior art.
The invention is realized by the following technical scheme:
the utility model provides a slot type coupling bears moment automatic test device for fire control which characterized in that: including water pressure control system, moment loading system, pipeline braced system, water receiving tank, seepage deformation detecting system, PLC controller, the internally mounted pipeline braced system of water receiving tank is installed subaerial, pipeline braced system includes the bracing piece of fixed mounting in the inside both ends of water receiving tank and the horizontal hauler of the upper portion installation of every bracing piece, install closed end pipeline on the horizontal hauler of one side, install the water inlet end pipeline on the horizontal hauler of opposite side, be connected by slot type coupling test piece between closed end pipeline and the water inlet end pipeline, the top of slot type coupling test piece is provided with moment loading system, the bottom of slot type coupling test piece is equipped with the seepage detection device, water inlet end pipeline is connected with water pressure control system, PLC controller control water pressure control system, moment loading system and seepage deformation detecting system's work.
Further, the supporting rods are fixed in the water receiving groove through bolts, and the horizontal distance between the two supporting rods is 800mm.
The longitudinal section of the horizontal towing bar is of a concave structure which is bent downwards, closed end short circuits and water inlet end pipelines with various specifications can be placed, and the structure can enable the axes of the closed end short circuits and the water inlet end pipelines to cross-deform when being stressed, but can be kept in the same plane.
The penetration detection device is connected with the bottom of the water receiving tank through a compression soft spring.
The moment loading system comprises a pressure sensor and a telescopic motor, wherein the pressure sensor is arranged on a telescopic shaft of the telescopic motor, a support is fixed on the outer side of the water receiving tank, and the telescopic motor is fixed on the support.
The osmotic deformation detection system further comprises a monitoring camera arranged on the support, and whether the osmotic deformation detection system is deformed and broken or not can be compared and judged according to images before and after the moment is applied to the groove type pipe joint test piece transmitted back by the monitoring camera.
The water pressure control system comprises a water inlet pipe connected with the bottom of a water inlet end pipeline, and a water pressure sensor I, an electromagnetic valve I and an electromagnetic clutch which are sequentially arranged on the water inlet pipe, wherein the electromagnetic clutch is connected with an electromagnetic valve II on a booster pump through a pressure hose, the booster pump is further provided with a water pressure sensor II and an electromagnetic valve III, and the electromagnetic valve III is connected with a water inlet main pipe.
The electromagnetic clutch is internally provided with a quick pipe joint, the quick pipe joint is connected with a telescopic pipe, the telescopic pipe is connected with a pressure-resistant hose, and the disconnection action of the quick pipe joint can be controlled through the electromagnetic clutch.
An exhaust pipe is arranged above the water inlet end pipeline, an electromagnetic valve IV is arranged on the exhaust pipe, and the electromagnetic valve IV is connected with a water touch induction switch.
The beneficial effects of the invention are as follows: the automatic test device for the bearing moment of the groove type pipe joint for fire protection can be used for placing water inlet end pipelines and closed end pipelines with various specifications, the electromagnetic clutch and the electromagnetic valves can replace manual operation, and the monitoring camera and the penetration detection device finish automatic judgment under the control of the PLC controller, so that the artificial interference factor in the detection process is minimized, the detection quality and efficiency are greatly improved, and the automatic detection is further improved, and the automatic detection device is suitable for popularization and use.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a front view of an automatic test device for carrying moment of a grooved pipe joint for fire protection;
FIG. 2 is a schematic top view of an automatic test device for carrying moment of a grooved pipe joint for fire protection according to the present invention;
FIG. 3 is a schematic left-view structure diagram of an automatic test device for carrying moment of a groove type pipe joint for fire control;
fig. 4 is a schematic diagram of the working state structure of the automatic test device for the bearing moment of the groove type pipe joint for fire protection.
In the figure, the ground is 1, the water receiving tank is 2, the support rod is 3, the horizontal supporting rod is 4, the closed end pipeline is 5, the leakage detection device is 6, the test piece of the groove type pipe joint is 7, the monitoring camera is 8, the support is 9, the pressure sensor is 10, the telescopic shaft is 12, the telescopic motor is 14, the motor fixing plate is 15, the water inlet end pipeline is 16, the exhaust pipe is 17, the electromagnetic valve IV is 18, the water inlet pipe is 19, the water pressure sensor I is 20, the electromagnetic valve I is 21, the electromagnetic clutch is 22, the telescopic pipe is 23, the pressure-resistant hose is 24, the electromagnetic valve II is 25, the water pressure sensor II is 26, the booster pump is 27, the PLC controller is 28, the electromagnetic valve III is 29, the water inlet main pipe is 30, the compression soft spring is 34, the water touch inductive switch is 35, the bracket is 36, and the quick pipe joint is 37.
Detailed Description
The drawings illustrate one embodiment of the invention. As shown in figures 1-3, the automatic test device for the bearing moment of the groove type pipe joint for fire protection comprises a water pressure control system, a moment loading system, a pipeline supporting system, a water receiving tank 2, a leakage deformation detection system and a PLC (programmable logic controller) 28, wherein the water receiving tank 2 is arranged on the ground 1, the pipeline supporting system is internally provided with the pipeline supporting system of the water receiving tank 2, the pipeline supporting system comprises supporting rods 3 fixedly arranged at two ends inside the water receiving tank 2 through bolts, and a horizontal hauling rod 4 is arranged at the upper part of each supporting rod 3, the longitudinal section of the horizontal hauling rod 4 is of a concave structure which is bent downwards, closed end short circuits 5 and water inlet end pipelines 16 with various specifications can be placed, the structure can enable the axes of the closed end short circuits 5 and the water inlet end pipelines 16 to cross-deform when stressed, but can be kept in the same plane, the horizontal distance between the two supporting rods 3 is 800mm, the closed end pipeline 5 is arranged on the horizontal hauling rod 4 on one side, the water inlet end pipeline 16 is arranged on the horizontal hauling rod 4 on the other side, the closed end pipeline 5 is connected with the water inlet end pipeline 16 through a groove type pipe joint test piece 7, a moment loading system is arranged above the groove type pipe joint test piece 7, the moment loading system comprises a pressure sensor 10 and a telescopic motor 14, the pressure sensor 10 is arranged on a telescopic shaft 12 of the telescopic motor 14, a bracket 9 is fixed on the outer side of the water receiving tank 2, the telescopic motor 14 is fixed on a motor fixing plate 15 on the bracket 9, a permeation detection device 6 is arranged at the bottom of the groove type pipe joint test piece 7, the permeation detection device 6 is connected with the bottom of the water receiving tank 2 through a compression soft spring 34, the permeation deformation detection system further comprises a monitoring camera 8 arranged on the bracket 9, the device can compare and judge whether the groove type pipe joint test piece 7 transmitted back by the monitoring camera 8 is deformed and broken according to the images before and after the moment, the water inlet end pipeline 16 is connected with a water pressure control system, the water pressure control system comprises a water inlet pipe 19 connected with the bottom of the water inlet end pipeline 16, a water pressure sensor I20, an electromagnetic valve I21 and an electromagnetic clutch 22 which are sequentially arranged on the water inlet pipe 19, the electromagnetic clutch 22 is connected with an electromagnetic valve II 25 on a booster pump 27 through a pressure hose 24, the booster pump 27 is also provided with a water pressure sensor II 26 and an electromagnetic valve III 29, the electromagnetic valve III 29 is connected with a water inlet main pipe 30, a quick pipe joint 37 is arranged in the electromagnetic clutch 22, a telescopic pipe 23 is connected with the pressure hose 24, the disconnection action of the quick pipe joint 37 can be controlled through the electromagnetic clutch 22, an exhaust pipe 17 is arranged above the water inlet end pipeline 16, the electromagnetic valve IV 18 is arranged on the exhaust pipe 17, the electromagnetic valve IV 18 is connected with a water contact induction switch 35, and the PLC 28 controls the water pressure control system, the moment loading system and the work of the deformation detection system.
When the automatic test device for the bearing moment of the groove type pipe joint for fire protection is used, the groove type pipe joint test piece 7 is connected with the closed end pipeline 5 and the water inlet end pipeline 16 of the corresponding pipe diameters, a test start key on the PLC 28 is pressed, the booster pump 27 works, after the pressure of the test piece rises to a rated working pressure value of the groove type pipe joint test piece 7, the electromagnetic clutch 22 is internally provided with the quick pipe joint 37 to be conducted, the electromagnetic valve I21, the electromagnetic valve II 25 and the water contact induction switch 35 are sequentially conducted, water enters the water inlet end pipeline 16, the groove type pipe joint test piece 7 and the closed end pipeline 5, air is expelled from the water contact induction switch 35, and the water contact induction switch 35 is closed after the water reaches. After the water pressure sensor I20 tests that the water pressure is stabilized at the rated working pressure, the electromagnetic valve 21I and the electromagnetic valve II 25 are closed, the electromagnetic clutch 22 is separated to enable the quick pipe joint 37 arranged inside to be disconnected, the pressure spring is controlled through the electromagnetic clutch 22 because of the pressure spring in the quick pipe joint 37 sold in the market, the disconnection of the quick pipe joint 37 can be completed, the leakage detection device 6 and the monitoring camera 8 work, the telescopic motor 14 work, the pressure sensor 10 moves down to a force value reaching a specified moment and then stops for 1min, the telescopic motor 14 stops after working reversely, the PLC controller 28 judges whether the quick pipe joint is deformed and broken according to the image contrast before and after the moment is transmitted by the monitoring camera 8 to the groove pipe joint test piece 7, and meanwhile, the data change of the leakage detection device 6 and the water pressure sensor I20 automatically gives a judgment conclusion according to programming. The automatic test device for the bearing moment of the groove type pipe joint for fire protection can be used for placing water inlet end pipelines and closed end pipelines with various specifications, the electromagnetic clutch and the electromagnetic valves can replace manual operation, and the monitoring camera and the penetration detection device finish automatic judgment under the control of the PLC controller, so that the artificial interference factor in the detection process is minimized, the detection quality and efficiency are greatly improved, and the automatic detection is further improved, and the automatic detection device is suitable for popularization and use.
Claims (6)
1. The utility model provides a slot type coupling bears moment automatic test device for fire control which characterized in that: the device comprises a water pressure control system, a moment loading system, a pipeline supporting system, a water receiving tank (2), a leakage deformation detection system and a PLC (programmable logic controller) (28), wherein the water receiving tank (2) is installed on the ground (1), the pipeline supporting system is installed inside the water receiving tank (2), the pipeline supporting system comprises supporting rods (3) fixedly installed at two ends inside the water receiving tank (2) and horizontal hauling rods (4) installed on the upper part of each supporting rod (3), a closed end pipeline (5) is installed on one side of the horizontal hauling rods (4), a water inlet end pipeline (16) is installed on the other side of the horizontal hauling rods (4), the closed end pipeline (5) is connected with the water inlet end pipeline (16) through a groove type pipe joint test piece (7), the moment loading system is arranged above the groove type pipe joint test piece (7), a penetration detection device (6) is arranged at the bottom of the groove type test piece (7), and the penetration detection device (6) is connected with the bottom of the water receiving tank (2) through a compression soft spring (34); the water inlet end pipeline (16) is connected with the water pressure control system, and the PLC (28) controls the work of the water pressure control system, the moment loading system and the leakage deformation detection system;
the moment loading system comprises a pressure sensor (10) and a telescopic motor (14), wherein the pressure sensor (10) is arranged on a telescopic shaft (12) of the telescopic motor (14), a support (9) is fixed on the outer side of the water receiving tank (2), the telescopic motor (14) is fixed on the support (9), and the leakage deformation detection system further comprises a monitoring camera (8) arranged on the support (9).
2. The automatic test equipment for the bearing moment of the groove type pipe joint for fire protection according to claim 1, wherein: the support rods (3) are fixed in the water receiving groove (2) through bolts, and the horizontal distance between the two support rods (3) is 800mm.
3. The automatic test equipment for the bearing moment of the groove type pipe joint for fire protection according to claim 1, wherein: the longitudinal section of the horizontal towing bar (4) is of a concave structure which is bent downwards.
4. The automatic test equipment for the bearing moment of the groove type pipe joint for fire protection according to claim 1, wherein: the water pressure control system comprises a water inlet pipe (19) connected with the bottom of a water inlet end pipeline (16), and a water pressure sensor I (20), a solenoid valve I (21) and a solenoid clutch (22) which are sequentially arranged on the water inlet pipe (19), wherein the solenoid clutch (22) is connected with a solenoid valve II (25) on a booster pump (27) through a pressure hose (24), the booster pump (27) is further provided with a water pressure sensor II 26 and a solenoid valve III 29, and the solenoid valve III (29) is connected with a water inlet main pipe (30).
5. The automatic test equipment for the bearing moment of the groove type pipe joint for fire protection according to claim 4, wherein: a quick pipe joint (37) is arranged in the electromagnetic clutch (22), a telescopic pipe (23) is connected to the quick pipe joint (37), and the telescopic pipe (23) is connected with a pressure-resistant hose (24).
6. The automatic test equipment for the bearing moment of the groove type pipe joint for fire protection according to claim 1 or 4, wherein: an exhaust pipe (17) is arranged above the water inlet end pipeline (16), an electromagnetic valve IV (18) is arranged on the exhaust pipe (17), and the electromagnetic valve IV (18) is connected with a water touch induction switch (35).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214605.4A CN106950109B (en) | 2017-04-01 | 2017-04-01 | Automatic test device for bearing moment of groove type pipe joint for fire control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214605.4A CN106950109B (en) | 2017-04-01 | 2017-04-01 | Automatic test device for bearing moment of groove type pipe joint for fire control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106950109A CN106950109A (en) | 2017-07-14 |
| CN106950109B true CN106950109B (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710214605.4A Active CN106950109B (en) | 2017-04-01 | 2017-04-01 | Automatic test device for bearing moment of groove type pipe joint for fire control |
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| CN (1) | CN106950109B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328658B (en) * | 2017-08-08 | 2019-10-18 | 浙江天雁控股有限公司 | A kind of fire hose pressure intelligent detection device |
| CN107884124B (en) * | 2017-11-28 | 2024-02-06 | 山东省产品质量检验研究院 | Automatic stability test device for mobile fire-fighting water storage device |
| CN108426776A (en) * | 2018-02-23 | 2018-08-21 | 江苏省产品质量监督检验研究院 | Hydraulic pressure is bent deflection angle experimental rig |
| CN108362442B (en) * | 2018-03-29 | 2024-04-19 | 山东和富工程检测有限公司 | Sealing ring-free leakage test device for groove type pipe joint for fire control |
| CN108593447A (en) * | 2018-04-20 | 2018-09-28 | 中国石油集团渤海石油装备制造有限公司 | Internal lining pipe water test unit and test method |
| CN108458838B (en) * | 2018-05-22 | 2024-03-29 | 山东和富工程检测有限公司 | Automatic reliability test device for fire-fighting electromagnetic valve |
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| CN103674389A (en) * | 2013-11-18 | 2014-03-26 | 北京宇航***工程研究所 | Test method of determining catheter sealing joint tightening torque |
| CN103792139A (en) * | 2012-10-29 | 2014-05-14 | 同济大学 | Method for measuring flexural rigidity of immersed tube tunnel joint |
| CN105738022A (en) * | 2016-02-26 | 2016-07-06 | 菏泽海诺知识产权服务有限公司 | Fire-fighting water gun switch moment automatic testing device |
| CN207074143U (en) * | 2017-04-01 | 2018-03-06 | 山东省产品质量检验研究院 | A kind of fire-fighting carries torque automatic test equipment with plough groove type pipe joint |
-
2017
- 2017-04-01 CN CN201710214605.4A patent/CN106950109B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792139A (en) * | 2012-10-29 | 2014-05-14 | 同济大学 | Method for measuring flexural rigidity of immersed tube tunnel joint |
| CN103674389A (en) * | 2013-11-18 | 2014-03-26 | 北京宇航***工程研究所 | Test method of determining catheter sealing joint tightening torque |
| CN105738022A (en) * | 2016-02-26 | 2016-07-06 | 菏泽海诺知识产权服务有限公司 | Fire-fighting water gun switch moment automatic testing device |
| CN207074143U (en) * | 2017-04-01 | 2018-03-06 | 山东省产品质量检验研究院 | A kind of fire-fighting carries torque automatic test equipment with plough groove type pipe joint |
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| CN106950109A (en) | 2017-07-14 |
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