CN113916674B - U-shaped cylinder pressure test device and test method - Google Patents
U-shaped cylinder pressure test device and test method Download PDFInfo
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- CN113916674B CN113916674B CN202111260592.7A CN202111260592A CN113916674B CN 113916674 B CN113916674 B CN 113916674B CN 202111260592 A CN202111260592 A CN 202111260592A CN 113916674 B CN113916674 B CN 113916674B
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- 238000012360 testing method Methods 0.000 title claims abstract description 88
- 238000010998 test method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000006835 compression Effects 0.000 claims abstract description 28
- 238000007906 compression Methods 0.000 claims abstract description 28
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 41
- 239000011295 pitch Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003466 welding Methods 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
- 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
-
- 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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- General Health & Medical Sciences (AREA)
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- Examining Or Testing Airtightness (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a U-shaped cylinder pressure test device and a test method, wherein the device comprises a loading and unloading rotary tool I, a fixing part II and a control part III; in the loading and unloading rotary tool I, the ends of the lower clamping plate, the connecting block, the connecting plate and the upper clamping plate are sequentially hinged and connected, and a product is clamped between the upper clamping plate and the lower clamping plate; in the fixing part II, a base is in threaded connection with a test bed, an exhaust screw is arranged on the side of the base in a penetrating way, an exhaust pipe is inserted into a small counter bore in the base, a top pipe orifice of the exhaust pipe extends into the right center in a product, a connecting compression ring is in threaded connection with the upper part of the base with an internal threaded hole, and the product is in threaded connection with a clearance space between the connecting compression ring and a large upper shaft of the base; in the control part III, a loose joint nut is in threaded connection with the lower part of the base, and a connecting pipe is communicated with the water inlet and outlet passage hole; one channel of the three-way ball valve is communicated with the test medium, and the other channel is communicated with the external drainage pipeline. The structure of the invention innovates the design of the U-shaped cylinder body from the aspects of exhaust, drainage and assembly and disassembly.
Description
Technical Field
The invention relates to the technical field of pressure test devices, in particular to a U-shaped cylinder pressure test device and a test method.
Background
When a pressure test is usually carried out on a product with an external thread structure at the mouth, the product to be tested can be fixed by utilizing the self-threading on the product, so that the wall thickness or the welding seam strength of the product can be detected, and the strength of the threading can be detected simultaneously. However, this way of securing the product by means of its own thread presents certain difficulties in the removal of the product after the test. Serious deformation, tearing and other phenomena can occur after the product is exploded, so that the test product can not be smoothly disassembled after the test is finished, and even the whole set of test tool is scrapped. In addition, in the prior art, after the water pressure test is finished, the system only relieves pressure, namely the product is taken down, the water in the test cavity is relieved but is not discharged, a certain resistance exists when the product is taken out, and meanwhile, the working environment is dirty and bad due to random water discharge.
Disclosure of Invention
In view of the above, the invention provides a U-shaped cylinder pressure test device and a test method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a U-shaped cylinder pressure test device comprises a loading and unloading rotary tool I, a fixing part II and a control part III;
the loading and unloading rotary tool I comprises an upper clamping plate, a lower clamping plate, a connecting block and a connecting plate; the ends of the lower clamping plate, the connecting block, the connecting plate and the upper clamping plate are sequentially hinged; a product is clamped between the upper clamping plate and the lower clamping plate, and the product is a semi-closed product with an external thread structure at the mouth part;
the fixing part II comprises a base, a connecting compression ring, an exhaust screw and an exhaust pipe; the middle part of the base is provided with a water inlet and outlet channel hole in a penetrating way; the base is connected to the test bed in a threaded manner; an internal threaded hole is formed in the side of the base and is communicated with a small counter bore in the base, and an exhaust screw is in threaded connection with the internal threaded hole; an exhaust pipe is inserted into the small counter bore, and a top pipe orifice of the exhaust pipe extends into the right center of the product; the connecting press ring is provided with a central internal threaded hole and is in threaded connection with the upper part of the base of the internal threaded hole; the product is in threaded connection in a clearance space between the connecting compression ring and the upper large shaft of the base;
the control part III comprises a loose joint nut, a connecting pipe and a three-way ball valve which are sequentially connected; the loose joint nut is in threaded connection with the lower part of the base; the connecting pipe is communicated with the water inlet and outlet passage hole; one channel of the three-way ball valve is communicated with the test medium, and the other channel of the three-way ball valve is communicated with the external drainage pipeline;
the side face of the side face is provided with a circular counter bore, the circular counter bore and the internal threaded hole form a side stepped hole, a sealing gasket is embedded in the circular counter bore, and an exhaust screw penetrates through the sealing gasket and is connected in the internal threaded hole in a threaded manner;
the lower end face of the base is provided with 4 threaded blind holes which are uniformly distributed in circumference relative to the center of the base, the base is arranged on a test bed, and bolts are connected with the test bed and the 4 threaded blind holes of the base in a threaded manner; the upper end face of the base is provided with 8 threaded through holes which are in central symmetry relative to the central axis of the base, the end face of the connecting compression ring is radially and uniformly provided with 8 light holes which are in circumference uniform distribution relative to the center of the connecting compression ring, the positions of the 8 threaded through holes and the 8 light holes are in one-to-one correspondence, and bolts are connected on the corresponding threaded through holes and the light holes in a threaded manner;
an annular groove is formed in the upper end face of the base, and a gasket is embedded in the annular groove; the lower part of the connecting compression ring is a stepped plane, and the lower protruding surface of the connecting compression ring is clamped in the annular groove and is connected with the lower protruding surface of the compression ring to compress the gasket; the lower end surface of the product is also in contact with the gasket;
the annular groove is formed in the outer circle of the upper large shaft of the base, the distance between the upper end of the annular groove and the upper end face of the connecting compression ring is larger than 2 screw pitches, the O-shaped sealing ring is embedded in the annular groove, and the O-shaped sealing ring is extruded when the product is in threaded connection with the gap space between the connecting compression ring and the upper large shaft of the base.
Preferably, the inner sides of the upper clamping plate and the lower clamping plate are respectively in threaded connection with two cowhide gaskets; the connecting block is provided with a handle.
Preferably, the base is a disc-shaped shaft part; the connecting compression ring is a sleeve part.
Preferably, an annular groove is formed in the outer circle of the insertion section of the exhaust pipe, a fixing ring is embedded in the annular groove, and the exhaust pipe is inserted into the small counter bore of the base and extrudes the fixing ring; the exhaust screw is internally provided with tiny inner holes distributed at 90 degrees.
Preferably, a circular counter bore is formed in the middle of the lower end face of the base, a water inlet sealing gasket is embedded in the circular counter bore, and the connecting pipe is in pressure connection with the water inlet sealing gasket.
A test method adopting a U-shaped cylinder pressure test device comprises the following steps:
(S1) mounting the fixing part II and the test stand and the control part III: the fixed part II is arranged on a test bed in a threaded manner, and the control part III is fastened at the small shaft end at the lower part of the fixed part II through threaded connection, so that the device is connected with a system pipeline;
(S2) mounting of a product workpiece: tightly holding a product workpiece by using a loading and unloading rotary tool I, and screwing the product workpiece into a base of a fixed part II clockwise until a gasket is compressed and deformed under the pressure action of the workpiece, namely, the product workpiece is installed in place;
(S3) preparation before test: before the test starts, unscrewing the exhaust screw to expose the radial exhaust port of the exhaust screw to the exhaust port sealing gasket, screwing the handle of the three-way ball valve to the lower channel position to enable the inner cavity of the U-shaped cylinder to be communicated with the test pipeline, and closing the side channel of the three-way ball valve;
(S4) pressure test: the system test medium water enters the inner cavity of the U-shaped cylinder body from the small round hole of the base through the lower channel, along with the rise of the water level in the cavity, redundant water and air enter the inner hole at the top end of the exhaust pipe, and are discharged from the exhaust screw through the 90-degree right-angle small round hole of the base, when the water discharged from the exhaust screw is all water, the exhaust screw is screwed, and the sealing pad of the exhaust port is compressed to enable the test cavity to be in a closed state;
when the system pressure rises to the required test pressure, starting to maintain the pressure, after the pressure is maintained for a specified time, starting to relieve the pressure, after the pressure relief is finished, screwing a handle of the three-way ball valve to the position of the side channel, closing the lower channel, closing a system pipeline, connecting the inner cavity of the U-shaped cylinder with a drainage pool pipeline, and discharging water in the inner cavity of the U-shaped cylinder;
(S5) completing the test and removing the workpiece: after the test medium is emptied, the workpiece is held tightly by the loading and unloading rotary tool I and is unscrewed in the anticlockwise reverse direction, and the workpiece is taken down, so that the whole test is completed.
Compared with the prior art, the invention has the beneficial effects that:
(1) Aiming at the characteristics of a semi-closed structure of the U-shaped cylinder, the invention introduces the exhaust pipe to the center of the bottom of the cylinder, so that the residual air in the test cavity is exhausted as much as possible, and the safety and the accuracy of the test are improved;
(2) The design of the three-way ball valve not only increases a guarantee for misoperation of the test system, but also enables water in the test cavity to be orderly emptied, so that the working environment is greatly improved;
(3) The invention design of the loading and unloading rotary tool I solves the problem of difficult loading and unloading of circular tube-shaped workpieces;
(4) When the product is initially screwed in, the O-shaped sealing ring is not required to be compressed, so that the product can be easily screwed in; the O-shaped sealing ring is contacted after the product is screwed in for 2 screw pitches, and then the product is screwed in by means of the driving force of the screw threads, so that the O-shaped sealing ring is not only extruded but also the screw threads are registered when the product is initially installed, and the O-shaped sealing ring is difficult to assemble; the design not only avoids the damage to the threads of the product caused by uneven stress during initial assembly, but also saves time and labor;
(5) When the product is severely deformed and torn and can not be unscrewed after the hydraulic blasting test, the connecting pressing ring and the scrapped product can be taken down together, the whole device is not scrapped, and the production cost is greatly saved;
(6) The device is designed aiming at semi-closed structure products such as U-shaped cylinder bodies or sealing heads and the like from the aspects of exhaust, drainage, loading and unloading and the like, so that the safety, accuracy and economy of the test are greatly improved, the working environment is improved, and the production cost is saved; the whole device has novel conception, safety, reliability, simple operation, economy and practicability.
Drawings
FIG. 1 is an overall front view of the present invention;
FIG. 2 is a top view of the loading and unloading screw I of the present invention;
FIG. 3 is a front view of a stationary part II of the present invention;
FIG. 4 is a front view of the control unit III of the present invention;
FIG. 5 is a front view of the base of the present invention;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a front view of the connecting collar of the present invention;
FIG. 8 is a top view of FIG. 7;
fig. 9 is a front view of the venting screw of the present invention.
In the figure: 1. a hinge rivet; 2. an upper clamping plate; 3. a lower clamping plate; 4. cow leather pad; 5. a screw; 6. a connecting block; 7. a connecting plate; 8. a handle; 9. a vent screw; 10. an exhaust port sealing gasket; 11. a base; 12. connecting a compression ring; 13. a fixing ring; 14. an exhaust pipe; 15. a water inlet sealing pad; 16. an O-ring seal; 17. a gasket; 18. a bolt; 19. a nut; 20. a connecting pipe; 21. three-way ball valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to FIG. 1, a pressure test device for a U-shaped cylinder is shown, which mainly comprises a loading and unloading rotary tool I, a fixing part II and a control part III. The test device is arranged on the test bed through 4 bolts and is connected with the test system through the P port of the three-way ball valve.
Referring to fig. 2, the handling screw i is shown. Wherein the ends of the lower clamping plate 3, the connecting block 6, the connecting plate 7 and the upper clamping plate 1 are hinged and connected through the hinge rivet 1 in sequence. The two cowhide gaskets 4 are respectively arranged on the inner sides of the upper clamping plate 2 and the lower clamping plate 3 by 6 screws 5, and the heads of the screws are pressed into the cowhide gaskets 4. When the self-locking handle is used, the handle rotates anticlockwise, the aperture between the upper clamping plate and the lower clamping plate is enlarged, the rotary tool is sleeved into a product, and the handle rotates clockwise again, so that the aperture between the upper clamping plate and the lower clamping plate is reduced, and self-locking is realized. Meanwhile, the product is extruded to form the cowhide gasket 4, the product is held tightly by friction force between the cowhide gasket and the product and clamping force of the upper clamping plate and the lower clamping plate, and the rotating rotary tool drives the product to rotate together so as to enable the product to be installed or detached.
Referring to fig. 3, a fixing part ii to which a product is fixed by screw connection is shown.
Wherein the vent sealing gasket 10 is placed in a counter bore on the side surface of the base 11 and is arranged on the side surface of the base 11 through a vent screw 9. The lower section of the exhaust pipe 14 is inserted into a small counter bore of the base 11, an annular groove for installing the fixing ring 13 is formed in the outer circle of the inserted section, the exhaust pipe 14 is fixed in the base 11 by extruding the fixing ring 13, and a pipe orifice at the top end of the exhaust pipe is positioned at the center of the device.
The O-shaped sealing ring 16 is arranged in the large shaft excircle annular groove at the upper section of the base 11, and the base and the product are sealed by extruding the O-shaped sealing ring 16 when the product is installed. The dimension a of the upper end of the annular groove and the upper end face of the connecting compression ring 12 is larger than 2 screw pitches, and the design ensures that the product can be easily screwed in without compressing the O-shaped sealing ring 16 when the product is initially screwed in. When the product is screwed into the O-shaped sealing ring after being screwed into 2 screw pitches, the product is screwed into the O-shaped sealing ring by the driving force of the screw threads, and the O-shaped sealing ring is not extruded and the screw threads are registered at the beginning of the screwing, so that the O-shaped sealing ring is difficult to assemble. The design not only avoids uneven stress during initial assembly from damaging the threads of the product, but also saves time and labor. The gasket 17 is arranged in the annular groove in the middle of the base 11, the connecting compression ring 12 is fastened on the base through 8 bolts 18, and meanwhile, the outer ring of the gasket 17 is pressed, so that the gasket 17 is prevented from being worn or changed in position along with the workpiece in the process of screwing the workpiece into the base, and the end face of the product screwed into place can be protected from being scratched.
Referring to fig. 4, the control part iii is composed of a loose joint nut 19, a connecting pipe 20 and a three-way ball valve 21. Referring to fig. 1, a loose-joint nut 19 is connected with an external thread at a water inlet at the lower end of the base 11, and is sealed by compressing the end face of a water inlet sealing gasket 15. The three-way ball valve 21 controls the flow direction of the test medium, when the handle is at the position of the P port, the T port is closed, the system test pipeline is communicated with the inner cavity of the product, and the test medium enters the inner cavity of the product for pressure test. When the handle is at the position of the T port, the P port is closed, meanwhile, a system test pipeline is closed, the inner cavity of the product is communicated with the outer drainage pipeline, and test media are discharged.
Referring to fig. 5 and 6, the base 11 is shown in front cross-section in fig. 5, and in top view in fig. 6. The base 11 is a disc-shaped shaft part, the lower end small shaft is connected with a control pipeline by external threads, the end face of the base is provided with a circular counter bore, and the water inlet sealing gasket 15 is arranged on the base. A small round hole is arranged in the middle of the water inlet and outlet channel. Two circles of threaded holes are uniformly distributed on the lower end face of the middle disc, and 8 threaded through holes uniformly distributed on the large diameter are used for installing the connecting compression ring 12. 4 threaded blind holes with small diameters are uniformly distributed for device installation. The upper end face of the disc is provided with an annular groove in which the gasket 17 is mounted. An annular groove is formed in the outer circle of the upper end large shaft for mounting the O-shaped sealing ring 16. The large shaft end edge is inverted by 20 degrees, which is beneficial to the installation and the introduction of products. The middle vehicle is provided with a dish-shaped counter bore, which is beneficial to centralized drainage. The end face is provided with a stepped hole connected with the stepped hole on the side face, and the upper section is slightly larger than the counter bore for the installation of the exhaust pipe. A facet is milled in the stepped bore of the side face to facilitate not only the machining of the bore but also the installation and compression sealing of the vent gasket 10. The outer end of the side stepped hole is a circular counter bore, the exhaust port sealing gasket 10 is installed on the circular counter bore, the counter bore is an internal threaded hole inwards, and the exhaust screw penetrates through the exhaust port sealing gasket to be installed on the circular counter bore. The middle is a small round hole to reduce the pressure on the exhaust screw during test.
Referring to fig. 7 and 8, the connecting press ring 12 is a sleeve part, the inner hole is an inner threaded hole, and the product is screwed with the inner threaded hole through external threads. The lower surface is a stepped plane, the protruding surface at the lower end is tightly pressed against the gasket 17, and a grinding wheel over-travel groove is reserved at the transition part between the upper annular plane and the circumference, so that the grinding processing is convenient, the edge angle interference is prevented, and the grinding wheel over-travel groove is perfectly attached to the base. The end surface is radially and uniformly provided with 8 unthreaded holes, and the connecting compression ring 12 is fastened on the base through the unthreaded holes by bolts 18. A small plane is milled at the position corresponding to the base on the side surface, so that the small plane is flush with the base and attractive.
Referring to fig. 9, the exhaust screw 9 has a small inner hole of 90 ° in the middle for exhaust. The radial exhaust port is smaller than the size of the sealing end, and when the radial exhaust port is unscrewed, the screw is still fixed on the pressing cover when the radial exhaust port exposes out of the sealing gasket.
The invention also provides a test method of the U-shaped cylinder pressure test device, which comprises the following steps:
(S1) mounting the fixing part II and the test stand and the control part III: the fixed part II is arranged on a test bed by 4 bolts, and the control part III is fastened at the small shaft end of the fixed part II through threaded connection, so that the device is connected with a system pipeline;
(S2) mounting of a product workpiece: the workpiece is held tightly by the assembling and disassembling rotary tool I and screwed into the base 11 clockwise until the gasket 17 is compressed and deformed under the pressure action of the workpiece, and then the gasket is installed in place;
(S3) preparation before test: before the test starts, the exhaust screw 9 is unscrewed, the radial exhaust port of the exhaust screw is exposed out of the exhaust port sealing gasket 10, the handle of the three-way ball valve 21 is screwed to the position of the P port, the inner cavity of the U-shaped cylinder body is communicated with a test pipeline, and the T port is closed;
(S4) pressure test: after the test system is ready, the test medium water of the test system enters the inner cavity of the U-shaped cylinder body from the small round hole of the base 11 through the P port, and along with the rising of the water level in the cavity, the redundant moisture and air enter through the inner hole at the top end of the exhaust pipe and are discharged from the exhaust screw through the 90-degree right-angle small round hole of the base. When the exhaust screw is discharged by water, the exhaust screw is screwed down, and the exhaust port sealing gasket 10 is compressed to enable the test cavity to be in a closed state. When the system pressure rises to the required test pressure, starting to maintain the pressure, after the pressure is maintained for a specified time, starting to relieve the pressure, after the pressure relief is finished, screwing the handle of the three-way ball valve 21 to the position of the T port, closing the P port, closing the system pipeline, connecting the inner cavity of the U-shaped cylinder with the pipeline of the drainage tank, and discharging water in the inner cavity of the U-shaped cylinder;
(S5) completing the test and removing the workpiece: after the test medium is emptied, the workpiece is held tightly by the loading and unloading rotary tool I and is unscrewed in the anticlockwise reverse direction, and the workpiece is taken down, so that the whole test is completed.
The device is designed innovatively in terms of air exhaust, water drainage, assembly and disassembly aiming at semi-closed structure products such as U-shaped cylinders or heads, and the like, so that the safety, accuracy and economy of the test are greatly improved, the working environment is improved, and the production cost is saved. The whole device has novel conception, safety, reliability, simple operation, economy and practicability.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (6)
1. The U-shaped cylinder pressure test device is characterized by comprising a loading and unloading rotary tool I, a fixing part II and a control part III;
the loading and unloading rotary tool I comprises an upper clamping plate, a lower clamping plate, a connecting block and a connecting plate; the ends of the lower clamping plate, the connecting block, the connecting plate and the upper clamping plate are sequentially hinged; a product is clamped between the upper clamping plate and the lower clamping plate, and the product is a semi-closed product with an external thread structure at the mouth part;
the fixing part II comprises a base, a connecting compression ring, an exhaust screw and an exhaust pipe; the middle part of the base is provided with a water inlet and outlet channel hole in a penetrating way; the base is connected to the test bed in a threaded manner; an internal threaded hole is formed in the side of the base and is communicated with a small counter bore in the base, and an exhaust screw is in threaded connection with the internal threaded hole; an exhaust pipe is inserted into the small counter bore, and a top pipe orifice of the exhaust pipe extends into the right center of the product; the connecting press ring is provided with a central internal threaded hole and is in threaded connection with the upper part of the base of the internal threaded hole; the product is in threaded connection in a clearance space between the connecting compression ring and the upper large shaft of the base;
the control part III comprises a loose joint nut, a connecting pipe and a three-way ball valve which are sequentially connected; the loose joint nut is in threaded connection with the lower part of the base; the connecting pipe is communicated with the water inlet and outlet passage hole; one channel of the three-way ball valve is communicated with the test medium, and the other channel of the three-way ball valve is communicated with the external drainage pipeline;
the side face of the side face is provided with a circular counter bore, the circular counter bore and the internal threaded hole form a side stepped hole, a sealing gasket is embedded in the circular counter bore, and an exhaust screw penetrates through the sealing gasket and is connected in the internal threaded hole in a threaded manner;
the lower end face of the base is provided with 4 threaded blind holes which are uniformly distributed in circumference relative to the center of the base, the base is arranged on a test bed, and bolts are connected with the test bed and the 4 threaded blind holes of the base in a threaded manner; the upper end face of the base is provided with 8 threaded through holes which are in central symmetry relative to the central axis of the base, the end face of the connecting compression ring is radially and uniformly provided with 8 light holes which are in circumference uniform distribution relative to the center of the connecting compression ring, the positions of the 8 threaded through holes and the 8 light holes are in one-to-one correspondence, and bolts are connected on the corresponding threaded through holes and the light holes in a threaded manner;
an annular groove is formed in the upper end face of the base, and a gasket is embedded in the annular groove; the lower part of the connecting compression ring is a stepped plane, and the lower protruding surface of the connecting compression ring is clamped in the annular groove and is connected with the lower protruding surface of the compression ring to compress the gasket; the lower end surface of the product is also in contact with the gasket;
the annular groove is formed in the outer circle of the upper large shaft of the base, the distance between the upper end of the annular groove and the upper end face of the connecting compression ring is larger than 2 screw pitches, the O-shaped sealing ring is embedded in the annular groove, and the O-shaped sealing ring is extruded when the product is in threaded connection with the gap space between the connecting compression ring and the upper large shaft of the base.
2. The U-shaped barrel pressure test device according to claim 1, wherein the inner sides of the upper clamping plate and the lower clamping plate are respectively connected with two cowhide gaskets in a threaded manner; the connecting block is provided with a handle.
3. The pressure test device for the U-shaped cylinder according to claim 1, wherein the base is a disc-shaped shaft part; the connecting compression ring is a sleeve part.
4. The U-shaped barrel pressure test device according to claim 1, wherein an annular groove is formed in the outer circle of the insertion section of the exhaust pipe, a fixing ring is embedded in the annular groove, and the exhaust pipe is inserted into a small counter bore of the base and extrudes the fixing ring; the exhaust screw is internally provided with tiny inner holes distributed at 90 degrees.
5. The U-shaped barrel pressure test device according to claim 1, wherein a circular counter bore is formed in the middle of the lower end face of the base, a water inlet sealing gasket is embedded in the circular counter bore, and the connecting pipe is in pressure connection with the water inlet sealing gasket.
6. A test method using the U-shaped cylinder pressure test apparatus as claimed in any one of claims 1 to 5, comprising the steps of:
(S1) mounting the fixing part II and the test stand and the control part III: the fixed part II is arranged on a test bed in a threaded manner, and the control part III is fastened at the small shaft end at the lower part of the fixed part II through threaded connection, so that the device is connected with a system pipeline;
(S2) mounting of a product workpiece: tightly holding a product workpiece by using a loading and unloading rotary tool I, and screwing the product workpiece into a base of a fixed part II clockwise until a gasket is compressed and deformed under the pressure action of the workpiece, namely, the product workpiece is installed in place;
(S3) preparation before test: before the test starts, unscrewing the exhaust screw to expose the radial exhaust port of the exhaust screw to the exhaust port sealing gasket, screwing the handle of the three-way ball valve to the lower channel position to enable the inner cavity of the U-shaped cylinder to be communicated with the test pipeline, and closing the side channel of the three-way ball valve;
(S4) pressure test: the system test medium water enters the inner cavity of the U-shaped cylinder body from the small round hole of the base through the lower channel, along with the rise of the water level in the cavity, redundant water and air enter the inner hole at the top end of the exhaust pipe, and are discharged from the exhaust screw through the 90-degree right-angle small round hole of the base, when the water discharged from the exhaust screw is all water, the exhaust screw is screwed, and the sealing pad of the exhaust port is compressed to enable the test cavity to be in a closed state;
when the system pressure rises to the required test pressure, starting to maintain the pressure, after the pressure is maintained for a specified time, starting to relieve the pressure, after the pressure relief is finished, screwing a handle of the three-way ball valve to the position of the side channel, closing the lower channel, closing a system pipeline, connecting the inner cavity of the U-shaped cylinder with a drainage pool pipeline, and discharging water in the inner cavity of the U-shaped cylinder;
(S5) completing the test and removing the workpiece: after the test medium is emptied, the workpiece is held tightly by the loading and unloading rotary tool I and is unscrewed in the anticlockwise reverse direction, and the workpiece is taken down, so that the whole test is completed.
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