CN115628984A - Pressure test tool and method for narrow closed oil cavity of piston rod with double-layer welding structure - Google Patents
Pressure test tool and method for narrow closed oil cavity of piston rod with double-layer welding structure Download PDFInfo
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- CN115628984A CN115628984A CN202211190223.XA CN202211190223A CN115628984A CN 115628984 A CN115628984 A CN 115628984A CN 202211190223 A CN202211190223 A CN 202211190223A CN 115628984 A CN115628984 A CN 115628984A
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000003466 welding Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 9
- 102100023170 Nuclear receptor subfamily 1 group D member 1 Human genes 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 210000005069 ears Anatomy 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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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- 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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention introduces a pressure test tool and a pressure test method for a narrow closed oil cavity of a double-layer welded structure piston rod; the pressure test device comprises a main hoop, an auxiliary hoop, a fastening bolt pair, a plug assembly and a pressure test connector; the main anchor ear and the auxiliary anchor ear are respectively arranged on the outer circle of the piston rod corresponding to the radial oil hole positions of the rings; the plug assemblies are respectively arranged in radial oil holes on the excircle of the piston rod, and the pressure test connectors are respectively arranged in the oil holes corresponding to the positions of the two avoiding holes on the main hoop. According to the pressure test tool and the pressure test method, the main hoop and the auxiliary hoop can tightly press and seal the welding seams of the plug and the pressure test connector, so that a high-pressure-resistant test of a closed oil cavity of a piston rod can be effectively guaranteed; the spring washer is used for buffering pressure test, so that the stability of the pressure test is ensured, scrap iron is prevented from falling into the closed oil cavity when the plug is plugged when the plug and the pressure test joint are disassembled, and the quality of the piston rod is ensured; the invention has simple structure, quick and convenient assembly and disassembly and low cost.
Description
Technical Field
The invention relates to the technical field of piston rod manufacturing, in particular to a pressure test tool and a pressure test method for a narrow closed oil cavity of a double-layer welded structure piston rod.
Background
The piston rod with a large-size double-layer welding structure is rare and is a large-size piston rod formed by welding an inner cylinder body, an outer cylinder body, an interlayer steel plate and the like; the structure is shown in figure 1; according to the use characteristics of the product, a narrow closed oil cavity is designed between the inner cylinder body and the outer cylinder body of the piston rod, and a sandwich steel plate is used for auxiliary support; a plurality of circles of radial oil holes are uniformly distributed on the working excircle of the piston rod, and the closed oil cavity of the piston rod is connected with the operating cylinder body through the radial oil through holes; the sealed oil cavity of the piston rod is subjected to a high-pressure-resistant test as required to ensure the product quality, but the high-pressure-resistant test of the sealed oil cavity is very difficult due to the influence of the space size, and no special equipment is provided, so that the pressure test requirements are difficult to meet by taking reference to the past experience and method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the pressure test tool and the pressure test method for the narrow closed oil cavity of the piston rod with the double-layer welding structure, has a simple structure, is convenient to use, and can be used for performing a high-pressure-resistant test on the closed oil cavity of the piston rod to ensure the product quality.
The technical scheme adopted by the invention is as follows:
a pressure test tool for a narrow closed oil cavity of a double-layer welding structure piston rod comprises a main hoop, an auxiliary hoop, a fastening bolt pair, a plug assembly and a pressure test connector;
the main anchor ear and the auxiliary anchor ear are both of a two-half-circle structure, two ends of the two-half-circle anchor ear are connected through fastening bolt pairs, and the main anchor ear and the auxiliary anchor ear are respectively arranged on the outer circle of the piston rod corresponding to the positions of the radial oil holes; the middle parts of the two semicircles of the main hoop are respectively provided with an avoidance hole for avoiding the pressure test joint;
the plug assemblies are respectively arranged in the radial oil holes on the outer circle of the piston rod and comprise plugs, spring washers and plugs; the plug, the spring washer and the plugs are sequentially arranged in the oil hole from inside to outside, a process screw hole is formed in the center of the outer end face of the plug, and the outer end faces of the plugs in the rest oil holes are welded with the circumference of the oil hole except for the two plugs in the oil hole corresponding to the two avoiding holes in the main hoop;
the pressure test connector is arranged in the oil hole corresponding to the two avoidance holes in the main hoop, the outer edge of the pressure test connector is welded with the end face of the oil hole, the pressure test connector is arranged in a hollow mode, the inner end face of the pressure test connector is in contact with a plug in the oil hole, the center of the outer end face of the pressure test connector is provided with a threaded hole which forms a step structure with the hollow portion, and a plugging nut is arranged on the threaded hole of one pressure test connector.
Specifically, the plug is made of nylon, and a 0.1-0.2 mm single-side gap is reserved between the plug and the oil hole.
Specifically, the aperture of the avoiding hole on the main hoop is 3-5 mm smaller than that of the oil hole; so that the main anchor ear is pressed on the welding seam of the pressure test joint and the oil hole.
A pressure test method for a narrow closed oil cavity of a double-layer welded structure piston rod comprises the following specific steps:
the method comprises the following steps: the plug assembly and the two pressure test connectors are respectively arranged in each oil hole of the piston rod, the plugs and the pressure test connectors are welded on the oil holes, the main anchor ear and the auxiliary anchor ear are arranged in place around the oil holes, and the weld joints are sealed; screwing a plugging screw cap on the upward test pressure joint to serve as an exhaust hole, wherein the screw cap is in a loose state;
step two: connecting the pressure testing connector in the downward direction with an oil pump, injecting oil into the closed oil cavity of the plug rod from the gap between the plug and the oil hole by the oil pump through the pressure testing connector, and screwing a sealing nut when the pressure testing connector in the upward direction emits oil;
step three: performing pressure test by pressurizing and maintaining pressure of an oil pump; after the pressure testing is finished, discharging the pressure testing oil;
step four: the main anchor ear and the auxiliary anchor ear are disassembled, and the welded plug and the pressure test joint are disassembled by machining on a machine tool; and (4) cleaning residual scrap iron in the oil hole, and moving the plug and the spring washer out by utilizing the process screw hole on the plug.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the pressure test tool and the pressure test method, the main hoop and the auxiliary hoop can tightly press and seal the welding seam of the plug and the pressure test joint, so that a high-pressure-resistant test of a closed oil cavity of the piston rod can be effectively guaranteed; the spring washer is used for buffering pressure test, so that the stability of the pressure test is ensured, scrap iron is prevented from falling into the closed oil cavity when the plug is plugged when the plug and the pressure test joint are disassembled, and the quality of the piston rod is ensured; the invention has simple structure, quick and convenient assembly and disassembly and low cost.
Drawings
Fig. 1 is a schematic view of a piston rod of a double-layer welded structure.
Fig. 2 is a schematic view of the present invention mounted on a piston rod.
Fig. 3 is a schematic sectional view of the auxiliary hoop of the present invention at the installation position on the piston rod.
Fig. 4 is a schematic sectional view of the main hoop of the present invention at the installation position on the piston rod.
In the figure: the device comprises a main hoop 1, a secondary hoop 2, a fastening bolt pair 3, a plug assembly 4, a plug 41, a spring washer 42, a plug 43, a pressure test connector 5, a blocking nut 6, an oil hole 7, an inner cylinder 8, an outer cylinder 9 and an interlayer steel plate 10.
Detailed Description
The invention is further explained below with reference to the drawings and examples, without thereby limiting the scope of protection of the invention, which is disclosed with the aim of protecting all technical modifications within the scope of the invention.
The main part piston rod of the 125MN tension stretcher is a large-size piston rod formed by welding an inner cylinder body, an outer cylinder body, an interlayer steel plate and the like, and the part length is 10.15m; the total weight of the parts is 12 tons, wherein 2 circles of oil holes with the diameter of 6-phi 50 in the radial direction are distributed on the outer circle, the sealed oil cavity of the piston rod is connected with the operation cylinder body through the radial oil holes, the diameter of the outer circle is phi 500f8mm in a working matching manner, according to the use characteristics of products, a narrow sealed oil cavity is designed between the inner cylinder body and the outer cylinder body of the piston rod, and an interlayer steel plate is used for auxiliary support; a40 MPa pressure test is required for a narrow closed oil cavity.
The pressure test tool for the narrow closed oil cavity of the double-layer welded structure piston rod shown in the attached drawings 1-4 comprises a main hoop 1, an auxiliary hoop 2, a fastening bolt pair 3, a plug assembly 4 and a pressure test connector 5.
The main anchor ear 1 and the auxiliary anchor ear 2 are both of a two-semicircular structure, two ends of the two semicircular anchor ears are connected through a fastening bolt pair 3, and the main anchor ear 1 and the auxiliary anchor ear 2 are respectively arranged on the excircle of the piston rod corresponding to the positions of the radial oil holes 7; the middle parts of the two semicircles of the main hoop 1 are respectively provided with an avoidance hole for avoiding the pressure test joint 5; the aperture of the avoiding hole is 3-5 mm smaller than that of the oil hole 7; so that the main anchor ear 1 is pressed on the welding seam of the pressure test joint 5 and the oil hole 7.
The plug assemblies 4 are respectively arranged in the radial oil holes 7 on the outer circle of the piston rod, and each plug assembly 4 comprises a plug 41, a spring washer 42 and a plug 43; the plug 41, the spring washer 42 and the plug 43 are sequentially arranged in the oil hole 7 from inside to outside, a process screw hole is formed in the center of the outer end face of the plug 41, the plug 41 is made of plastic, and a single-side gap of 0.1-0.2 mm is reserved between the plug 41 and the oil hole 7; except for the two plugs 43 in the oil holes 7 corresponding to the two avoiding holes on the main anchor ear 1, the outer end faces of the plugs 43 in the other oil holes 7 are welded with the circumferences of the oil holes 7.
The pressure test joint 5 is respectively arranged in the oil hole 7 corresponding to the positions of the two avoidance holes in the main hoop 1, the outer edge of the pressure test joint 5 is welded with the end face of the oil hole 7, the pressure test joint 5 is arranged in a hollow mode, the inner end face of the pressure test joint 5 is in contact with a plug 43 in the oil hole 7, a threaded hole which forms a step structure with the hollow portion is formed in the center of the outer end face, and a blocking nut 6 is arranged on the threaded hole of one pressure test joint 5.
A pressure test method for a narrow closed oil cavity of a double-layer welded structure piston rod comprises the following specific steps:
the method comprises the following steps: respectively installing an end cap assembly 4 and two pressure test connectors 5 in each oil hole 7 of the piston rod, welding an end cap 43 and the pressure test connectors 5 on the oil holes 7, installing a main anchor ear 1 and an auxiliary anchor ear 2 around the oil holes 7 in place, and sealing the weld joints; screwing a plugging screw cap 6 on the upward-directed pressure testing connector 5 to serve as an exhaust hole, wherein the screw cap is in a loose state;
step two: connecting the downward pressure testing connector 5 with an oil pump, injecting oil into the closed oil cavity of the plug rod from the gap between the plug 41 and the oil hole 7 by the oil pump through the pressure testing connector, and tightening the blocking nut 6 when the upward pressure testing connector 5 emits oil;
step three: performing pressure test by pressurizing and maintaining pressure of an oil pump; after the pressure test is finished, discharging the pressure test oil;
step four: the main anchor ear 1 and the auxiliary anchor ear 2 are disassembled, and the welded plug 43 and the pressure test joint 5 are disassembled after machining on a machine tool; and (3) cleaning residual scrap iron in the oil hole 7, and moving the plug 41 and the spring washer 42 out by utilizing the process screw hole on the plug 41.
The invention can arrange a main anchor ear and a plurality of auxiliary anchor ears according to the oil holes with different turns of the piston rod.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (4)
1. A pressure test tool for a narrow closed oil cavity of a double-layer welding structure piston rod is characterized by comprising a main hoop, an auxiliary hoop, a fastening bolt pair, a plug assembly and a pressure test connector;
the main anchor ear and the auxiliary anchor ear are of a two-semicircular structure, two ends of the two semicircular anchor ear are connected through a fastening bolt pair, and the main anchor ear and the auxiliary anchor ear are respectively arranged on the outer circle of the piston rod corresponding to the radial oil hole positions; avoidance holes for avoiding the pressure test connectors are respectively formed in the middle parts of the two semicircles of the main hoop;
the plug assemblies are respectively arranged in the radial oil holes on the excircle of the piston rod and comprise plugs, spring washers and plugs; the plug, the spring washer and the plugs are sequentially arranged in the oil hole from inside to outside, a process screw hole is formed in the center of the outer end face of the plug, and the outer end faces of the plugs in the rest oil holes are welded with the circumference of the oil hole except for the two plugs in the oil hole corresponding to the two avoidance holes in the main anchor ear;
the pressure test connector is arranged in the oil hole corresponding to the two avoidance holes in the main hoop, the outer edge of the pressure test connector is welded with the end face of the oil hole, the pressure test connector is arranged in a hollow mode, the inner end face of the pressure test connector is in contact with a plug in the oil hole, the center of the outer end face of the pressure test connector is provided with a threaded hole which forms a step structure with the hollow portion, and a plugging nut is arranged on the threaded hole of one pressure test connector.
2. The narrow closed oil chamber pressure testing tool for the double-layer welding structure piston rod is characterized in that: the plug is made of nylon materials, and a 0.1-0.2 mm single-side gap is reserved between the plug and the oil hole.
3. The narrow closed oil chamber pressure testing tool for the double-layer welding structure piston rod is characterized in that: the aperture of the avoiding hole on the main hoop is 3-5 mm smaller than that of the oil hole.
4. The pressure test method for the narrow closed oil chamber of the double-layer welded structure piston rod as claimed in any one of claims 1 to 3, wherein the method comprises the following specific steps:
the method comprises the following steps: the plug assembly and the two pressure test connectors are respectively arranged in each oil hole of the piston rod, the plugs and the pressure test connectors are welded on the oil holes, the main anchor ear and the auxiliary anchor ear are arranged in place around the oil holes, and sealing is realized on the welding seams; screwing a plugging nut on the upward-oriented test pressing joint to serve as an exhaust hole, wherein the nut is in a loose state;
step two: connecting the pressure testing connector in the downward direction with an oil pump, injecting oil into the closed oil cavity of the plug rod from the gap between the plug and the oil hole by the oil pump through the pressure testing connector, and screwing a sealing nut when the pressure testing connector in the upward direction emits oil;
step three: carrying out pressure test by pressurizing and pressure maintaining of an oil pump; after the pressure testing is finished, discharging the pressure testing oil;
step four: the main anchor ear and the auxiliary anchor ear are disassembled, and the welded plug and the pressure test connector are disassembled by machining on the machine tool; and (4) cleaning residual scrap iron in the oil hole, and moving the plug and the spring washer out by utilizing the process screw hole on the plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190223.XA CN115628984B (en) | 2022-09-28 | 2022-09-28 | Pressure testing tool and method for narrow sealed oil cavity of piston rod with double-layer welding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190223.XA CN115628984B (en) | 2022-09-28 | 2022-09-28 | Pressure testing tool and method for narrow sealed oil cavity of piston rod with double-layer welding structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115628984A true CN115628984A (en) | 2023-01-20 |
| CN115628984B CN115628984B (en) | 2023-09-15 |
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|---|---|---|---|
| CN202211190223.XA Active CN115628984B (en) | 2022-09-28 | 2022-09-28 | Pressure testing tool and method for narrow sealed oil cavity of piston rod with double-layer welding structure |
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| CN110541735A (en) * | 2019-08-23 | 2019-12-06 | 中信重工机械股份有限公司 | Rotor fixing device for transporting whole steam turbine |
| CN212871709U (en) * | 2020-09-23 | 2021-04-02 | 深圳市亿威仕流体控制有限公司 | High-temperature and high-pressure testing device for packer rubber barrel |
| CN113008486A (en) * | 2021-03-18 | 2021-06-22 | 浙江省工业设备安装集团有限公司 | Hoop type pipeline pressure test tool and pressure test method |
| CN113977203A (en) * | 2021-11-11 | 2022-01-28 | 中国航发贵州黎阳航空动力有限公司 | Machining process of long spray rod assembly |
| CN215981433U (en) * | 2021-04-06 | 2022-03-08 | 新乡市冠彤机电安装工程有限公司 | Anchor ear weldable type fixture for high-pressure oil and gas pipeline leakage emergency |
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2022
- 2022-09-28 CN CN202211190223.XA patent/CN115628984B/en active Active
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| DE2446743A1 (en) * | 1974-09-12 | 1976-04-08 | Hans Braun | Tube testing device by pressure - uses hydraulic pressure to test strength and tightness of welded seams and of tubes themselves |
| US4614110A (en) * | 1984-06-08 | 1986-09-30 | Osterberg Jorj O | Device for testing the load-bearing capacity of concrete-filled earthen shafts |
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| Publication number | Publication date |
|---|---|
| CN115628984B (en) | 2023-09-15 |
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Effective date of registration: 20240321 Address after: 471000 No. 206, Jianxi, Luoyang District, Henan, Jianshe Road Patentee after: CITIC HEAVY INDUSTRIES Co.,Ltd. Country or region after: Zhong Guo Patentee after: CITIC Corporation of China Address before: 471000 No. 206, Jianxi, Luoyang District, Henan, Jianshe Road Patentee before: CITIC HEAVY INDUSTRIES Co.,Ltd. Country or region before: Zhong Guo |