CN116296147A - Pipe fitting hydraulic blasting device and test method - Google Patents

Pipe fitting hydraulic blasting device and test method Download PDF

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Publication number
CN116296147A
CN116296147A CN202310343043.9A CN202310343043A CN116296147A CN 116296147 A CN116296147 A CN 116296147A CN 202310343043 A CN202310343043 A CN 202310343043A CN 116296147 A CN116296147 A CN 116296147A
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China
Prior art keywords
end cover
detected
sealing
pipe
left end
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CN202310343043.9A
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Chinese (zh)
Inventor
石琳
杨华
吴震宇
张紫轩
彭来湖
倪庆清
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Modern Textile Technology Innovation Center Jianhu Laboratory
Zhejiang Sci Tech University ZSTU
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Modern Textile Technology Innovation Center Jianhu Laboratory
Zhejiang Sci Tech University ZSTU
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Priority to CN202310343043.9A priority Critical patent/CN116296147A/en
Publication of CN116296147A publication Critical patent/CN116296147A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0274—Tubular or ring-shaped specimens
    • 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
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • 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

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  • Physics & Mathematics (AREA)
  • General 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)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The application provides a pipe fitting water pressure blasting device and a test method, and belongs to the technical field of composite material pressure-resistant pipe fitting performance test. The device comprises a seal detection mechanism, a pressurized blasting mechanism, a data acquisition mechanism and a safety protection mechanism. The device can provide better sealing conditions for the pressurized blasting experiment, can record experimental data in real time through a digital circuit and computer software, is convenient to acquire data, has higher detection precision, and can safely and reliably complete the acquisition of the blasting experimental data.

Description

Pipe fitting hydraulic blasting device and test method
Technical Field
The application relates to a pipe fitting water pressure blasting device and a test method, and belongs to the technical field of composite material pressure-resistant pipe fitting performance test.
Background
The composite pipe fitting is widely applied to the application fields of multiple pressure-resistant container engineering such as petroleum and natural gas transportation, hydrogen energy storage and transportation, chemical sewage discharge, offshore oilfield exploitation and the like due to the advantages of light weight, high strength, fatigue resistance, high corrosion resistance, convenience in transportation and installation and the like.
The hydraulic bursting test of the pressure-resistant pipe fitting is to continuously apply pressure on the inner surface of the pipe fitting through liquid, and measure the maximum pressure of the pipe fitting during the failure of the pipe fitting, namely the bursting strength of the material. Burst pressure is an important parameter for measuring the pressure endurance capacity of a pipe fitting in the design and manufacturing stages, and the ratio of burst pressure to the design pressure can represent the safety margin of the pipe fitting to a certain extent, so that the burst pressure is particularly important in engineering application. Once the pressure-resistant pipe fitting is failed in strength and broken in use, serious casualties and property loss can be caused. Therefore, the hydraulic bursting test of the composite pressure-resistant pipe fitting is very important for the application of the composite pressure-resistant pipe fitting in the engineering field.
In a hydraulic blasting experiment, the tightness of the pipe fitting directly influences the reliability of experimental data. The existing opening pipe fitting sealing technology is that a metal stepped shaft is directly plugged into the pipe fitting, then the pipe fitting is sealed by adhesive, and destructive methods such as beating and the like are needed for disassembly after the test is finished. However, the composite pipe fitting has poor out-of-plane impact resistance, and the destructive disassembly mode can cause secondary damage of the composite pipe fitting after blasting, so that the blasting damage characteristic analysis of the sample is affected. The other sealing method is to compress the sample by connecting the gland with a plurality of bolt upright posts uniformly distributed on the flange surface of the base, however, the method can cause uneven stress deformation of the sample during assembly, and fiber and resin on the end surface of the composite pipe fitting are extremely easy to damage, so that the performance of the subsequent materials is reduced, and the accuracy of the test result is further affected.
At present, the water pressure blasting experiment of the composite pipe fitting lacks a related safety protection mechanism. Fragments generated during blasting of the composite pipe and ejected water flows can damage testers and surrounding facilities, so that a safety protection mechanism needs to be added to the pipe sample, and safety of testers and experimental facilities is ensured. In addition, the progressive damage process during the blasting of composite pipe fittings is relatively complex, and a series of damage modes such as resin cracks, layering, fiber breakage and the like often occur. However, there is currently a lack of an adapted safety protection mechanism that can ensure observation of composite damage behavior while safeguarding.
Disclosure of Invention
In view of this, the present application first provides a hydraulic bursting device for a pipe, which can measure bursting strength of the pipe by continuously applying a hydraulic pressure to the inside of the pipe under a safety test condition.
Specifically, the application is realized through the following scheme:
a pipe fitting water pressure blasting device comprises a seal detection mechanism, a safety protection mechanism, a pressure blasting mechanism and a data acquisition mechanism, wherein the seal detection mechanism is arranged in the safety protection mechanism,
the seal detection mechanism comprises a seal sleeve, a hollow mandrel, a left end cover and a right end cover,
the two ends of the hollow core shaft are sleeved with a left end cover and a right end cover, the right end cover is sleeved with a sealing sleeve, the hollow core shaft protruding out of the right end cover is positioned in the sealing sleeve, an exhaust hole is formed in the sealing sleeve, and a plug is arranged on the exhaust hole in a matched mode;
a closing blade is arranged in one end, close to the right end cover, of the hollow mandrel, and the state of the closing blade is controlled by a traction mechanism so as to change the on-off state of the hollow mandrels at two sides of the closing blade;
a plurality of water injection holes are formed in the hollow mandrel between the left end cover and the sealing sleeve, the hollow mandrel at one end of the left end cover is connected with a pressurizing and blasting mechanism, the pressurizing and blasting mechanism is provided with a pressure testing pump, and the pressure testing pump blasts and pressurizes the hollow mandrel;
the data acquisition mechanism comprises a pressure sensor, wherein the pressure sensor is positioned in the sealing sleeve and is used for detecting and recording real-time pressure;
the left end cover is in threaded connection with the hollow mandrel, so that the pipe to be detected is sealed and arranged between the left end cover and the right end cover.
According to the scheme, the outer side of the hollow mandrel, the inner side of the pipe to be detected, the left end cover and the right end cover form the detection unit, the hollow mandrel, the sealing sleeve and the right end cover are used as detection sealing units, the pressure testing pump forms a core component of the pressurizing and blasting mechanism, the detection unit and the sealing units are pressurized and blasted, the acquired blasting data of the pipe to be detected are recorded and collected, the hydraulic blasting performance of the pipe to be detected is obtained, the safety protection mechanism is matched, experimental data can be recorded in real time, the data acquisition is convenient, the detection precision is high, and the acquisition of the blasting experimental data can be completed safely and reliably.
Further, as preferable:
the nut is further arranged on the outer side (left side) of the left end cover and used for fastening the left end cover to prevent the left end cover from being pressed to move outwards and influence the tightness of the pipe to be detected. More preferably, the nut is in sealing connection with the left end cover through an O-shaped sealing ring.
The left end cover and the right end cover are respectively provided with a boss, the diameters of the bosses are not more than the inner diameter of the pipe to be detected, the pipe to be detected is clamped between the bosses of the left end cover and the right end cover, the pipe to be detected is fixed by means of the bosses, and the pipe to be detected is prevented from sliding relatively in the pressurizing process. More preferably, the boss is in sealing connection with the pipe to be detected through a sealing gasket and a polytetrafluoroethylene belt.
The left end cover is in threaded connection with the hollow mandrel.
The traction mechanism is controlled to work by a switching valve, the switching valve is arranged outside the sealing sleeve, and the switching valve is used for closing and controlling the closing blade through the traction mechanism.
The safety protection mechanism comprises an auxiliary plate and a pair of baffle plates, wherein the auxiliary plate is hinged to the top of one baffle plate, a positioning groove is correspondingly formed in each baffle plate, the sealing detection mechanism is arranged between the positioning grooves, overhead installation of the sealing detection mechanism in the blasting experiment process is realized, and the sealing detection mechanism is prevented from being influenced by other acting forces.
More preferably:
the locating groove bottom installs the elastic component, realizes that the pipe that different diameters are waited to detect the location installation in the constant head tank, can set up the standing groove of an elastic component along the constant head tank bottom to open the elastic component top in the side and set up the draw-in groove board, the spout is seted up to the side, installs the slide in the spout, and the slide is connected with the draw-in groove board, and the slide is along the spout displacement, can drive the draw-in groove board displacement, forms relative controllable height between the constant head tank of messenger's draw-in groove board top to the pipe that waits of adaptation different diameters is put into: pressing the sliding plate to enable the clamping groove plate to move downwards, and placing the seal detection mechanism (comprising a pipe to be detected) into the positioning groove; and the sliding plate is loosened, and the elastic piece recovers deformation to push the clamping groove plate to move upwards to clamp the sealing detection mechanism.
Still include by the base, be provided with the recess on the base, install the slide bar in the recess, baffle bottom and slide bar connection, the baffle is reciprocating motion along the slide bar to adjust the interval between two baffles, can set up spacing screw on the slide bar, fix a position the baffle. When the device is used, the spacing between baffles arranged on the sliding rod is adjusted according to the specific length of the pipe to be detected, and after the position is confirmed, the limiting screw is screwed down.
In the scheme, the auxiliary plate can be made of transparent acrylic material, so that visual observation of test phenomenon is facilitated.
The pressure testing pump adopts an electric control mode, and can accurately set a pressure value and timely supplement pressure.
The pressure test pump is provided with a servo pressure control valve, and the servo pressure control valve is a proportional pneumatic control type pressure control valve, so that the function of uniformly adjusting the supercharging speed can be realized.
The pressure sensor is connected with a data acquisition card of the computer through the pressure gauge and the A/D conversion module.
The connecting pipeline between the pressure testing pump and the pressure gauge is provided with the safety valve and the controllable one-way valve, so that unstable pressure is prevented in the test process, and meanwhile, the pressure maintaining is timely carried out when the functional failure occurs, the follow-up test is continued after the fault is repaired conveniently, and the repeated test is avoided.
The device seals the pipe to be detected by using the seal detection mechanism convenient to detach, the sealing unit detects the sealing state of the pipe to be detected, and then the pressure testing pump pressurizes the pipe to be detected until the pipe to be detected is in explosion failure. The burst test is performed in a safety protection mechanism, allowing the camera to take test phenomenon shots outside and recording test data by software.
Meanwhile, the applicant also provides a test method of the device, which comprises the following steps:
s1, installing a tube to be detected: sleeving the tube to be detected on the outer side of the hollow mandrel to enable the tube to be detected to be installed between bosses of the left end cover and the right end cover, and hermetically connecting the left end cover, the tube to be detected and the right end cover;
s2, screwing the left end cover to ensure sealing, and forming a sealing cavity among the right end cover, the hollow mandrel and the sealing end cover;
s3, placing the sealing detection mechanism provided with the pipe to be detected in the safety protection mechanism, fixing the sealing detection mechanism, and putting down the auxiliary plate;
s4, opening a plug and a traction mechanism of the exhaust hole, connecting a pressure testing pump and a seal detection mechanism, continuously and uniformly pumping liquid into the hollow mandrel, then closing the plug and the traction mechanism, comparing the data of the pressure sensor in the pipe to be detected and the pressure sensor in the seal cavity, which are isolated from each other, and detecting the sealing performance;
and S5, continuously and uniformly pumping liquid into the hollow mandrel after the sealing performance is detected to be qualified until the damage of the pipe to be detected is caused by liquid leakage, liquid injection or sample explosion. In the test process, the damage development process of the surface of the pipe fitting during blasting is observed through an auxiliary baffle, and pressure data measured by an A/D converter are recorded on a computer.
And S6, cleaning the tube to be detected after the test is finished, and observing and recording the final blasting damage morphology of the tube to be detected.
The advantages of the present application can be summarized as follows:
the whole loading and unloading process of the sealing unit can be realized by means of threaded connection between the left end cover and the hollow mandrel, so that the compression and relaxation can be realized, the stress is uniform, the assembly is simple, the production and the manufacturing are convenient, the cost is low, the right end cover, the hollow mandrel and the sealing end cover form a sealing cavity for sealing detection in the sealing unit, the better sealing effect is ensured, the pressurized blasting experiment of a pipe to be detected can be realized rapidly, other damages to the pipe to be detected are not caused, and the subsequent analysis and research on the damage mechanism and the failure process are facilitated. The blasting method realized by the device is suitable for the pressurized blasting test of the pressure-resistant pipe fitting, the test sealing effect is good, the assembly of parts is convenient, the sample process is safe and controllable, and the experimental data is accurate and reliable.
Drawings
FIG. 1 is an overall schematic view of the apparatus of the present application;
FIG. 2 is a schematic cross-sectional view of a sealing mechanism of the present application;
FIG. 3 is an enlarged view of a portion of the portion A of FIG. 2;
fig. 4 is a schematic view of a safety mechanism of the present application.
Reference numerals in the drawings: B. a tube to be detected; 1. a seal detection mechanism; 11. a hollow mandrel; 111. a water injection hole; 112. a sealing gasket; 113. a polytetrafluoroethylene tape; 12. a left end cover; 13. a right end cover; 131. a boss; 14. a mechanical nut; an o-ring seal; 15. a sealing sleeve; 151. an exhaust hole; 152. a plug; 153. an elastic rubber layer; 154. a traction mechanism; 155. a switch valve; 156. closing the blade; 2. a safety protection mechanism; 21. a baffle; 22. a positioning groove; a 23 base; 231. a groove; 24. a slide bar; 25. a limit screw; 26. a compression spring; 27. an auxiliary plate; 28. a slot plate; 281. a slide plate; 282. a chute; 3. a pressure test pump; 31. a pressure gauge; 4. and a computer.
Detailed Description
In the description of the present invention, it should be noted that, the terms "upper", "lower", "front", "rear", "left end", "right end", "top", "bottom", and the like indicate that the azimuth or positional relationship is based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description, and do not represent the azimuth or positional relationship in actual use.
The embodiment of the hydraulic blasting device for the pipe fitting is combined with fig. 1, and comprises a seal detection mechanism 1, a safety protection mechanism 2, a pressurized blasting mechanism comprising a pressure testing pump 3 and a data acquisition mechanism taking a computer 4 as a carrier, wherein the pressure testing pump 3 and a hollow mandrel 11 are connected through a pipeline, a pressure gauge 31, a pressure sensor (not marked in the figure) and the like matched with the pressure testing pump 3 are connected with the data acquisition card 4 of the computer 4 through an A/D conversion module (conventional technology, not shown in the figure).
The structure of the seal detection mechanism 1 in the scheme is shown in fig. 2 and 3: the device comprises a pipe B to be detected, a hollow mandrel 11, a left end cover 12, a right end cover 13 and a sealing sleeve 15 for sealing detection.
The tube B to be detected is arranged between the left end cover 12 and the right end cover 13, the center of the left end cover 12 penetrates through the hole and is internally threaded (not marked in the figure), the end covers on two sides are provided with bosses 131 for positioning the tube B to be detected, the size of each boss 131 is smaller than the inner diameter of the tube B to be detected, and the place where the tube B to be detected is contacted with the left end cover 12 and the right end cover 13 on two sides is sealed by using a sealing gasket 112 and a polytetrafluoroethylene belt 113. The middle part of the hollow mandrel 11 is uniformly provided with a plurality of completely penetrating water injection holes 111 in the transverse direction and the axial direction, one end of the hollow mandrel is provided with external threads with a certain length, the external threads are matched with the internal threads of the left end cover 12, the left end cover 12 is made to reciprocate left and right through the threads, the clamping and loosening of a pipe B to be detected are realized, meanwhile, the left end cover 12 is compressed by using a mechanical nut 14, and the sealing treatment is carried out at the position where the mechanical nut 14 is matched with the hollow mandrel 11 by using an O-shaped sealing ring 141.
The sealing sleeve 15, the right end cover 13 and the hollow mandrel 11 are integrated to form a sealing cavity together, so that the sealing performance of the sealing cavity is ensured. The seal sleeve 15 is mounted with a pressure gauge (not shown) for detecting the internal pressure. The gas in the tube B to be detected can be discharged into the sealed cavity through the water injection hole 111 on the hollow mandrel 11 during the liquid injection process. The seal sleeve 15 is provided with an exhaust hole 151, and the exhaust hole 151 is provided with a plug 152. In the liquid filling process, the vent hole 151 is in an open state for venting, and when the pipe B to be detected and the sealing cavity are filled with liquid, the vent hole 151 is blocked by the plug 152. An elastic rubber layer 153 is arranged on the inner wall of the hollow mandrel 11, the on-off valve 155 at the side of the sealing sleeve 15 controls the closing blade 156 through the traction mechanism 154, and the closing blade 156 and the elastic rubber layer 153 are mutually extruded when being closed, so that the isolation of the hollow mandrel 11 is completed, and the liquid circulation state of the inside of the pipe B to be detected and the sealing cavity is controlled.
In the examples of the present invention, prior to the burst test, a device tightness test was performed. After the pipe B to be detected and the seal detection mechanism 1 are installed, the liquid is pumped into the hollow mandrel 1 by the pressure test pump 3 (an electric pressure test pump can be adopted), the liquid enters from one end of the hollow mandrel 11 and flows into the pipe B to be detected and the seal cavity, and gas in the pipe fitting is discharged into the seal cavity through the water injection hole 111 of the hollow mandrel 11 and is discharged through the exhaust hole 151 in the pouring process. After filling the tube B to be tested and the sealed cavity with liquid, the vent 151 is closed and the pumping of liquid into the hollow mandrel 11 is continued until the sealing test pressure is reached. Then, the switching valve 155 on the side of the seal sleeve 15 is closed, the traction mechanism 154 is driven by the action of the switching valve 155 to open and close the closing blade 156, and when the closing blade 156 is closed, the closing blade and the elastic rubber layer 153 are mutually pressed and sealed, and the hollow mandrel 11 and the seal cavity are isolated, so that a pressure maintaining test is performed. By comparing the pressure gauge indication number on the sealing cavity with the pressure sensor indication number of the pipe B to be detected, whether the pressure sensor indication number of the pipe B to be detected is reduced or not is observed, if the pressure sensor indication number is reduced, the fact that the pipe B to be detected is not completely sealed is indicated, and the installation and sealing of all the pipe fittings are required to be carried out again so as to ensure the sealing performance of the sealing device.
Referring to fig. 1 and 4, the installation protection mechanism 2 comprises a baffle 21, a positioning groove 22, a base 23 and a slide bar 24, wherein the base 23 is provided with a groove 231, the baffle 21 is arranged on two sides, the bottom of the baffle 21 is nested in the groove 231 with the slide bar 24, and the specific position is controlled by a limit screw 25. The two baffles 21 are symmetrically arranged and an auxiliary plate 27 for safety observation is provided at the top of one side baffle by a hinge connection. The baffle plates on both sides are provided with positioning grooves 22. The bottom end of the positioning groove 22 is provided with a clamping groove plate 28, a sliding plate 281 and an elastic body, namely a compression spring 26. When the pressure-proof pipe fitting, namely the pipe B to be detected is positioned, the sliding plate 281 is pressed downwards along the sliding groove 282, the sliding plate 281 is connected with the clamping groove plate 28 to move downwards, the compression spring 26 is extruded, and the pressure-proof pipe fitting can be fixed and supported by means of the upward elasticity of the compression spring 26. The slot plate 281 is required to be a semicircular circular plate.
When the device is used for carrying out a hydraulic blasting experiment, and referring to fig. 1, the hydraulic blasting experiment method comprises the following steps:
s1, installing each pipe fitting, sleeving a pipe B to be detected on a hollow mandrel 11, respectively assembling a left end cover 12 and a right end cover 13 on the left side and the right side of the pipe B to be detected, and ensuring that the pipe B to be detected is positioned at a boss 131 of each end cover, screwing the left end cover 12 to be contacted with the left side of the pipe B to be detected through a mechanical thread 14, and sealing the contact positions of the left side and the right side through a sealing gasket 112 and a polytetrafluoroethylene belt 113;
s2, screwing the mechanical nut 14 at the left end, and sealing the junction of the mechanical nut 14, the hollow mandrel 11 and the left end cover 12 by using an O-shaped sealing ring 141;
s3, placing the sealed detection mechanism 1 in a positioning groove 22 of the safety protection mechanism 2, pressing a sliding plate 281 to enable a clamping groove plate 28 to move downwards, placing the sealed detection mechanism 1 in the positioning groove 22, loosening the sliding plate 281, and pushing the clamping groove plate 28 by the thrust of a compression spring 26 to fix a pipe B to be detected;
s4, adjusting the distance between the baffles 21 arranged on the slide bar 24 according to the specific length of the pipe fitting, screwing the limit screw 25 after confirming the position, and putting down the auxiliary plate 27;
s5, opening the plug 152 of the exhaust hole 151 on the sealing sleeve 15, and opening the on-off valve 155 on the sealing sleeve 15. The pressure test pump 3 and the hollow mandrel 11 are connected, and the liquid is continuously and uniformly pumped into the installed pipe fitting. Then closing the plug 152 and the switch valve 155, and detecting the sealing performance by comparing the pressure sensor data in the pipe fitting and the pressure sensor data in the sealing cavity;
and S6, continuously and uniformly pumping liquid into the hollow mandrel 11 and the pipe B to be detected after the sealing performance is detected to be qualified until the pipe B to be detected is subjected to liquid leakage and liquid injection phenomena or sample burst due to material damage. During the test, the development of damage to the surface of the pipe at the time of blasting is observed through the auxiliary plate 27, and pressure data measured by the a/D converter are recorded on the computer 4;
and S7, after the test is finished, cleaning a sample B of the pipe to be detected, and observing and recording the final blasting damage morphology of the pipe fitting.

Claims (10)

1. A pipe fitting water pressure blasting device which is characterized in that: comprises a seal detection mechanism, a safety protection mechanism, a pressurized blasting mechanism and a data acquisition mechanism, wherein the seal detection mechanism is arranged in the safety protection mechanism,
the seal detection mechanism comprises a seal sleeve, a hollow mandrel, a left end cover and a right end cover,
the two ends of the hollow core shaft are sleeved with a left end cover and a right end cover, the right end cover is sleeved with a sealing sleeve, the hollow core shaft protruding out of the right end cover is positioned in the sealing sleeve, an exhaust hole is formed in the sealing sleeve, and a plug is arranged on the exhaust hole in a matched mode;
a closing blade is arranged in one end, close to the right end cover, of the hollow mandrel, and the state of the closing blade is controlled by a traction mechanism so as to change the on-off state of the hollow mandrels at two sides of the closing blade;
a plurality of water injection holes are formed in the hollow mandrel between the left end cover and the sealing sleeve, the hollow mandrel at one end of the left end cover is connected with a pressurizing and blasting mechanism, the pressurizing and blasting mechanism is provided with a pressure testing pump, and the pressure testing pump blasts and pressurizes the hollow mandrel;
the data acquisition mechanism comprises a pressure sensor, wherein the pressure sensor is positioned in the sealing sleeve and is used for detecting and recording real-time pressure;
the left end cover is in threaded connection with the hollow mandrel, so that the pipe to be detected is sealed and arranged between the left end cover and the right end cover.
2. A hydraulic blasting apparatus for pipe fittings according to claim 1, wherein: the left end cover is in threaded connection with the hollow mandrel.
3. A hydraulic blasting apparatus for pipe fittings as claimed in claim 2, wherein: and a nut is further arranged on the outer side of the left end cover and used for sealing and fastening the left end cover and the hollow mandrel.
4. A hydraulic blasting apparatus for pipe fittings according to claim 1, wherein: the traction mechanism is controlled to work by a switching valve, the switching valve is arranged outside the sealing sleeve, and the switching valve is used for closing and controlling the closing blade through the traction mechanism.
5. A hydraulic blasting apparatus for pipe fittings according to claim 1, wherein: the safety protection mechanism comprises an auxiliary plate and a pair of baffle plates, wherein the auxiliary plate is hinged to the top of one baffle plate, a positioning groove is correspondingly formed in each baffle plate, and the seal detection mechanism is arranged between the positioning grooves.
6. A hydraulic blasting apparatus for pipe fittings according to claim 5, wherein: and the bottom of the positioning groove is provided with an elastic piece to realize the positioning and installation of the pipes to be detected with different diameters in the positioning groove.
7. A hydraulic blasting apparatus for pipe fittings according to claim 5, wherein: the positioning groove is characterized in that a positioning groove is formed in the bottom of the positioning groove, a sliding groove is formed in the side face of the positioning groove, a sliding plate is installed in the sliding groove and connected with the clamping groove plate, the elastic piece is located in the positioning groove, and the top of the elastic piece is connected with the clamping groove plate.
8. A hydraulic blasting apparatus for pipe fittings according to claim 5, wherein: still include by the base, be provided with the recess on the base, install the slide bar in the recess, the baffle bottom is connected with the slide bar, and the baffle is reciprocating motion along the slide bar to adjust the interval between two baffles.
9. A hydraulic blasting apparatus for pipe fittings as defined in claim 8, wherein: and a limit screw is arranged on the slide bar to position the baffle.
10. A method of using the hydraulic blasting apparatus of claim 1, wherein: the method comprises the following steps:
s1, sleeving a tube to be detected on the outer side of a hollow mandrel to enable the tube to be detected to be installed between a left end cover and a right end cover, wherein the left end cover, the tube to be detected and the right end cover are in sealing connection, and a sealing cavity is formed among the right end cover, the hollow mandrel and the sealing end cover;
s2, placing the sealing detection mechanism provided with the pipe to be detected in the safety protection mechanism, fixing and putting down the auxiliary plate;
s3, opening a plug and a traction mechanism of the exhaust hole, connecting a pressure test pump and a seal detection mechanism, continuously and uniformly pumping liquid into the hollow mandrel, and then closing the plug and the traction mechanism to detect the sealing performance;
s4, continuously pumping liquid into the hollow mandrel until the pressure in the pipe to be detected is reduced after the sealing performance is detected to be qualified, and indicating that the pipe to be detected is in explosion failure;
and S5, cleaning the tube to be detected after the test is finished, and observing and recording the final blasting damage morphology of the tube to be detected.
CN202310343043.9A 2023-03-29 2023-03-29 Pipe fitting hydraulic blasting device and test method Pending CN116296147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310343043.9A CN116296147A (en) 2023-03-29 2023-03-29 Pipe fitting hydraulic blasting device and test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310343043.9A CN116296147A (en) 2023-03-29 2023-03-29 Pipe fitting hydraulic blasting device and test method

Publications (1)

Publication Number Publication Date
CN116296147A true CN116296147A (en) 2023-06-23

Family

ID=86836044

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310343043.9A Pending CN116296147A (en) 2023-03-29 2023-03-29 Pipe fitting hydraulic blasting device and test method

Country Status (1)

Country Link
CN (1) CN116296147A (en)

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