CN115628984B - Pressure testing tool and method for narrow sealed oil cavity of piston rod with double-layer welding structure - Google Patents
Pressure testing tool and method for narrow sealed oil cavity of piston rod with double-layer welding structure Download PDFInfo
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- CN115628984B CN115628984B CN202211190223.XA CN202211190223A CN115628984B CN 115628984 B CN115628984 B CN 115628984B CN 202211190223 A CN202211190223 A CN 202211190223A CN 115628984 B CN115628984 B CN 115628984B
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 238000003466 welding Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 10
- 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 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 210000005069 ears Anatomy 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 14
- 102100023170 Nuclear receptor subfamily 1 group D member 1 Human genes 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 4
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 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
-
- 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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 sealed oil cavity of a piston rod with a double-layer welding structure; the pressure testing device comprises a main anchor ear, an auxiliary anchor ear, a fastening bolt pair, a plug assembly and a pressure testing 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 each circle; the plug assemblies are respectively arranged in radial oil holes on the outer circle of the piston rod, and the pressure test connectors are respectively arranged in oil holes corresponding to the positions of the two avoidance holes on the main anchor ear. According to the pressure test tool and the pressure test method, the main anchor ear and the auxiliary anchor ear can tightly seal the welding seam of the plug and the pressure test joint, and the high-pressure test of the sealed oil cavity of the piston rod can be effectively ensured; the spring washer is used as pressure test buffer, pressure test stability is guaranteed, the stopper prevents scrap iron from falling into the closed oil cavity when the plug and the pressure test connector are removed, and quality of the piston rod is guaranteed; the invention has simple structure, rapid 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 testing tool and method for a narrow sealed oil cavity of a piston rod with a double-layer welding structure.
Background
The piston rod with a large-size double-layer welding structure is rare, and is a large-size piston rod formed by assembling and welding an inner-layer cylinder body, an outer-layer 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 airtight oil cavity is designed between the inner cylinder body and the outer cylinder body of the piston rod, and the piston rod is supported in an auxiliary way by an interlayer steel plate; a plurality of circles of radial oil holes are uniformly distributed on the working excircle of the piston rod, and a closed oil cavity of the piston rod is connected with the operating cylinder body through the radial oil holes; the high-pressure withstand voltage test is carried out on the sealed oil cavity of the piston rod according to the requirement to ensure the product quality, but the high-pressure withstand voltage test of the sealed oil cavity is very difficult due to the influence of space size, and special equipment is not provided, so that the pressure test requirement is difficult to meet by the aid of the past experience and method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pressure test tool and a pressure test method for a narrow sealed oil cavity of a piston rod with a double-layer welding structure, which are simple in structure and convenient to use, and can be used for performing a high-pressure-resistant test on the sealed oil cavity of the piston rod, so that the product quality is ensured.
The technical scheme adopted by the invention is as follows:
a pressure test fixture for a narrow airtight oil cavity of a piston rod with a double-layer welding structure comprises a main anchor ear, an auxiliary anchor ear, a fastening bolt pair, a plug assembly and a pressure test connector;
the main anchor ear and the auxiliary anchor ear are of two semicircular structures, two ends of the two semicircular anchor ears are connected in an auxiliary mode through fastening bolts, and the main anchor ear and the auxiliary anchor ear are arranged on the outer circle of the piston rod corresponding to the positions of the radial oil holes of each circle respectively; the middle parts of the two semicircle parts of the main hoop are respectively provided with an avoidance hole for avoiding the pressure test joint;
the plug assembly is respectively arranged in each radial oil hole on the outer circle of the piston rod and comprises a plug, a spring washer and a plug; 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, except for two plugs in the oil hole corresponding to the two avoidance holes on the main anchor ear, the outer end faces of the plugs in the other oil holes are all welded with the circumference of the oil hole;
the pressure testing joint sets up respectively in the oilhole corresponding with two dodges hole positions on the main staple bolt, and the pressure testing joint outer fringe welds with the oilhole terminal surface, and the pressure testing joint is the cavity setting, and the pressure testing joint interior terminal surface contacts with the end cap in the oilhole, and outer terminal surface center is provided with the screw hole that forms step structure with the well, is provided with the shutoff nut on the screw hole of one of them pressure testing joint.
Specifically, the plug is made of nylon, and a single-side gap of 0.1-0.2 mm is reserved between the plug and the oil hole.
Specifically, the hole diameter of the avoidance hole on the main hoop is smaller than the hole diameter of the oil hole by 3-5 mm; so that the main anchor ear is pressed on the welding seam between the pressure testing joint and the oil hole.
A pressure test method for a narrow airtight oil cavity of a piston rod with a double-layer welding structure comprises the following specific steps:
step one: the plug assembly and the two pressure testing connectors are respectively arranged in each oil hole of the piston rod, the plug and the pressure testing 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 welding seam is sealed; screwing a blocking nut on the upward pressure test joint to serve as an exhaust hole, wherein the nut is in a loosening state;
step two: connecting a downward pressure test connector 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 through the pressure test connector, and screwing the plug nut when the upward pressure test connector emits oil;
step three: pressurizing and maintaining pressure through an oil pump, and performing a pressure test; after the pressure test is finished, discharging the pressure test oil;
step four: removing the main anchor ear and the auxiliary anchor ear, and machining and removing the welded plugs and the pressure test joint by an upper machine tool; and cleaning residual scrap iron in the oil hole, and removing the plug and the spring washer by using a process screw hole on the plug.
By adopting the technical scheme, the invention has the following advantages:
according to the pressure test tool and the pressure test method, the main anchor ear and the auxiliary anchor ear can tightly seal the welding seam of the plug and the pressure test joint, and the high-pressure test of the sealed oil cavity of the piston rod can be effectively ensured; the spring washer is used as pressure test buffer, pressure test stability is guaranteed, the stopper prevents scrap iron from falling into the closed oil cavity when the plug and the pressure test connector are removed, and quality of the piston rod is guaranteed; the invention has simple structure, rapid and convenient assembly and disassembly and low cost.
Drawings
Fig. 1 is a schematic structural view of a piston rod of a double-layer welded structure.
Fig. 2 is a schematic view of the mounting of the present invention on a piston rod.
Fig. 3 is a schematic cross-sectional view of the secondary staple of the present invention in its installed position on the piston rod.
Fig. 4 is a schematic cross-sectional view of the main anchor of the present invention in its installed position on a piston rod.
In the figure: the device comprises a main hoop, an auxiliary hoop, a fastening bolt pair, a 4-plug assembly, a 41-plug, a 42-spring washer, a 43-plug, a 5-pressure test connector, a 6-plug nut, a 7-oil hole, an 8-inner cylinder, a 9-outer cylinder and a 10-interlayer steel plate.
Detailed Description
The present invention is further explained below with reference to the drawings and examples, which are not to be construed as limiting the scope of the invention, and the purpose of the present invention is to protect all technical improvements within the scope of the invention.
The main part piston rod of the 125MN tension stretcher is a large-size piston rod formed by assembling and welding an inner layer cylinder body, an outer layer cylinder body, an interlayer steel plate and the like, and the part length is 10.15m; the total weight of the part is 12 tons, wherein 2 circles of oil holes with the diameter of 6-phi 50 are distributed on the outer circle, the closed oil cavity of the piston rod is connected with the operation cylinder body through the radial oil holes, the diameter phi 500f8mm of the outer circle is matched with the work of the part, a narrow closed oil cavity is designed between the inner-layer cylinder body and the outer-layer cylinder body of the piston rod according to the use characteristics of the product, and the piston rod is supported in an auxiliary way by an interlayer steel plate; the narrow closed oil cavity is required to be subjected to a 40MPa withstand voltage test.
The utility model provides a narrow airtight oil pocket pressure testing frock of bilayer welded structure piston rod that combines shown in figures 1-4, includes main staple bolt 1, vice staple bolt 2, fastening bolt pair 3, end cap subassembly 4 and pressure testing joint 5.
The main anchor ear 1 and the auxiliary anchor ear 2 are of two semicircle structures, two ends of the two semicircle anchor ears are connected through a fastening bolt pair 3, and the positions of the main anchor ear 1 and the auxiliary anchor ear 2 corresponding to the radial oil holes 7 of each circle are respectively arranged on the outer circle of the piston rod; the middle parts of the two semicircle parts of the main hoop 1 are respectively provided with an avoidance hole for avoiding the pressure test joint 5; the aperture of the avoidance 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 between the pressure testing joint 5 and the oil hole 7.
The plug assembly 4 is respectively arranged in each radial oil hole 7 on the outer circle of the piston rod, and the 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 two plugs 43 in the oil holes 7 corresponding to the two avoidance holes on the main anchor ear 1, the outer end faces of the plugs 43 in the rest oil holes 7 are all welded with the circumference of the oil hole 7.
The pressure testing joint 5 is arranged in the oil holes 7 corresponding to the two avoidance holes on the main hoop 1 respectively, the outer edge of the pressure testing joint 5 is welded with the end faces of the oil holes 7, the pressure testing joint 5 is hollow, the inner end face of the pressure testing joint 5 is in contact with the plugs 43 in the oil holes 7, the center of the outer end face is provided with a threaded hole which forms a step structure with the hollow part, and a plugging nut 6 is arranged on the threaded hole of one of the pressure testing joints 5.
A pressure test method for a narrow airtight oil cavity of a piston rod with a double-layer welding structure comprises the following specific steps:
step one: the plug assembly 4 and the two pressure test joints 5 are respectively arranged in each oil hole 7 of the piston rod, the plug 43 and the pressure test joints 5 are welded on the oil holes 7, the main anchor ear 1 and the auxiliary anchor ear 2 are arranged in place around the oil holes 7, and the welding seam is sealed; a blocking nut 6 is screwed on the upward pressure test joint 5 to serve as an exhaust hole, and the nut is in a loose state;
step two: connecting the downward pressure test joint 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 through the pressure test joint, and screwing the plug nut 6 when the upward pressure test joint 5 emits oil;
step three: pressurizing and maintaining pressure through an oil pump, and performing a pressure test; 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 plug 43 and the pressure test joint 5 which are disassembled and welded are machined by an upper machine tool; residual scrap iron in the oil hole 7 is cleaned, and the plug 41 and the spring washer 42 are removed by using a process screw hole on the plug 41.
According to the invention, a main anchor ear and a plurality of auxiliary anchor ears can be arranged according to the oil holes with different turns of the piston rod.
The invention is not described in detail in the prior art.
The embodiments selected herein for the purposes of disclosing the present invention are presently considered to be suitable, however, it is to be understood that the present invention is intended to include all such variations and modifications as fall within the spirit and scope of the present invention.
Claims (4)
1. The pressure test tool for the narrow airtight oil cavity of the piston rod with the double-layer welding structure is characterized by comprising a main anchor ear, an auxiliary anchor ear, a fastening bolt pair, a plug assembly and a pressure test connector;
the main anchor ear and the auxiliary anchor ear are of two semicircular structures, two ends of the two semicircular anchor ears are connected in an auxiliary mode through fastening bolts, and the main anchor ear and the auxiliary anchor ear are arranged on the outer circle of the piston rod corresponding to the positions of the radial oil holes of each circle respectively; the middle parts of the two semicircle parts of the main hoop are respectively provided with an avoidance hole for avoiding the pressure test joint;
the plug assembly is respectively arranged in each radial oil hole on the outer circle of the piston rod and comprises a plug, a spring washer and a plug; the plug, the spring washer and the plugs are sequentially arranged in the oil hole from inside to outside, a unilateral gap is formed between the plug and the oil hole, 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 other 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 on the main anchor ear;
the pressure testing joint sets up respectively in the oilhole corresponding with two dodges hole positions on the main staple bolt, and the pressure testing joint outer fringe welds with the oilhole terminal surface, and the pressure testing joint is the cavity setting, and the pressure testing joint interior terminal surface contacts with the end cap in the oilhole, and outer terminal surface center is provided with the screw hole that forms step structure with the well, is provided with the shutoff nut on the screw hole of one of them pressure testing joint.
2. The double-layer welding structure piston rod narrow closed oil cavity pressure test tool according to claim 1, wherein: the plug is made of nylon, and a single-side gap of 0.1-0.2 mm is reserved between the plug and the oil hole.
3. The double-layer welding structure piston rod narrow closed oil cavity pressure test tool according to claim 1, wherein: the hole diameter of the avoidance hole on the main hoop is smaller than the hole diameter of the oil hole by 3-5 mm.
4. The pressure test method for the narrow sealed oil cavity of the piston rod with the double-layer welding structure is applied to the pressure test tool for the narrow sealed oil cavity of the piston rod with the double-layer welding structure, and is characterized by comprising the following specific steps:
step one: the plug assembly and the two pressure testing connectors are respectively arranged in each oil hole of the piston rod, the plug and the pressure testing 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 welding seam is sealed; screwing a blocking nut on the upward pressure test joint to serve as an exhaust hole, wherein the nut is in a loosening state;
step two: connecting a downward pressure test connector with an oil pump, injecting oil into the closed oil cavity of the plug rod from a unilateral gap between the plug and the oil hole through the pressure test connector, and screwing the blocking nut when the upward pressure test connector emits oil;
step three: pressurizing and maintaining pressure through an oil pump, and performing a pressure test; after the pressure test is finished, discharging the pressure test oil;
step four: removing the main anchor ear and the auxiliary anchor ear, and machining and removing the welded plugs and the pressure test joint by an upper machine tool; and cleaning residual scrap iron in the oil hole, and removing the plug and the spring washer by using a 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 CN115628984A (en) | 2023-01-20 |
| CN115628984B true 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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| US20100186484A1 (en) * | 2006-08-07 | 2010-07-29 | Car-Ber Investments Inc. | Apparatus and Method for Isolating or Testing a Pipe Segment with Axial Reinforcement |
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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 |
| US5024079A (en) * | 1988-06-08 | 1991-06-18 | Dufort Mario C | Test plug for flanged pipes |
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| Publication number | Publication date |
|---|---|
| CN115628984A (en) | 2023-01-20 |
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