CN107843500B - Flushing pressure testing device of hydraulic press - Google Patents
Flushing pressure testing device of hydraulic press Download PDFInfo
- Publication number
- CN107843500B CN107843500B CN201710954825.0A CN201710954825A CN107843500B CN 107843500 B CN107843500 B CN 107843500B CN 201710954825 A CN201710954825 A CN 201710954825A CN 107843500 B CN107843500 B CN 107843500B
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- Prior art keywords
- flushing
- guide sleeve
- pressure cylinder
- rod
- pressure
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 88
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 210000004907 gland Anatomy 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005056 compaction Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
Classifications
-
- 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
- G01N2203/0014—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
- G01N2203/02—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
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing 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
- G01N2203/02—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
Landscapes
- 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 provides a flushing pressure testing device of a hydraulic press, which comprises a high-pressure cylinder, a front cylinder body, a flushing rod guiding device and a sealing compaction block which are sequentially arranged, wherein the high-pressure cylinder is connected with the front cylinder body through a connecting block, the flushing rod guiding device is arranged inside the high-pressure cylinder and the front cylinder body, a flushing rod is arranged inside the flushing rod guiding device, a first guide sleeve, a second guide sleeve, a third guide sleeve and a sealing group are arranged outside the flushing rod guiding device, the first guide sleeve, the second guide sleeve and the sealing group are arranged between the outer surface of the flushing rod and the inner surface of the high-pressure cylinder, and the third guide sleeve is arranged between the outer surface of the flushing rod and the inner surface of the front cylinder body. The fixed support of the flushing rod is set to be a two-point support, so that the problem that the original three-point support is easy to have coaxiality deviation is avoided, the retraction of the flushing head is not influenced even if the guide sleeve is worn slightly, the problem of spare part precision is reduced, and meanwhile, the stability of the flushing rod is improved.
Description
Technical Field
The invention belongs to the technical field of mechanical equipment, and particularly relates to a flushing pressure testing device of a hydraulic press.
Background
The flushing device is the most important component part of the hydraulic steel pipe testing machine, mainly completes the pressure testing work on the steel pipe, in the whole pressure testing process, the most critical part is the main booster, the main function is to provide pressure for the whole steel pipe test, complete the pressing, sealing and other contents on the steel pipe, the flushing rod of the main booster is a key part, all high-pressure water enters the pipe body through the inside of the flushing rod, the existing flushing rod guiding device is provided with three guide sleeves in front, middle and back to keep the balance when the flushing rod horizontally moves, and the dimensional accuracy and the position tolerance of the three guide sleeves reach quite high level due to the high accuracy of the flushing rod, but the guide sleeve size processed by the current general machine processing factory is difficult to reach.
Because the flushing rod is arranged in the flushing device, the flushing device has large volume, high weight and severe position space, and brings great difficulty to maintenance and overhaul. When the three guide sleeves are installed, the coaxiality of the three guide sleeves is difficult to reach a theoretical value, once one guide sleeve is worn, according to the principle that one straight line is determined by three points, the three guide sleeves are not on the same straight line, the coaxiality of the three guide sleeves cannot be ensured, the coaxiality of the three guide sleeves and a flushing rod is offset, the flushing rod is locked during pressure test, the flushing head cannot be retracted, and therefore a steel pipe test cannot be performed. At this time, the flushing rod or the guide sleeve must be replaced, because the flushing device has huge volume and small position space, the weight is up to 15 tons, once the flushing device fails, the disassembling replacement needs to be carried out in 4-5 days, a large amount of manpower and material resources are consumed, and in addition, the flushing device needs to be cooperated and communicated with the electric crane and the crown block to carry out the up-down cross operation, so that a plurality of potential safety hazards exist, and the production rhythm of a production unit can be influenced. And because the processing precision of the flushing rod is high, the cost is high, the spare part period is long, the old part is frequently maintained, and the high cost is caused for maintenance in an intangible way.
Disclosure of Invention
The invention aims to solve the problems that in the background art, due to coaxiality deviation, a steel pipe test cannot be performed, the overhaul cost of a flushing device is high, a large amount of manpower and material resources are consumed, overhaul potential safety hazards exist and the like.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a hydraulic press bath pressure testing device, includes high-pressure cylinder, preceding cylinder body, bath pole guider and the sealed compact heap that sets gradually, the high-pressure cylinder with preceding cylinder body passes through the connecting piece and is connected, bath pole guider sets up the high-pressure cylinder with the inside of preceding cylinder body, the inside bath pole that sets up of bath pole guider, the outside first guide pin bushing, second guide pin bushing, third guide pin bushing and the sealed group of setting of bath pole guider, first guide pin bushing second guide pin bushing with the sealed group sets up between the surface of bath pole with the internal surface of high-pressure cylinder, the third guide pin bushing sets up between the bath pole surface with the preceding cylinder body internal surface.
Preferably, a water flushing head moving cylinder is arranged at the bottom of the front cylinder body, one side of the water flushing head moving cylinder is fixedly connected with the connecting block through a base, and the other side of the water flushing head moving cylinder is fixedly connected with the oil cylinder base.
Preferably, the first guide sleeve has an inner diameter of 220.5mm.
Preferably, the device further comprises a low-pressure cylinder, wherein the low-pressure cylinder is connected with the high-pressure cylinder through a connecting gland, and a pressure testing ring is arranged outside the connecting gland.
Preferably, a low pressure cylinder supporting device is arranged at the bottom of the low pressure cylinder, a guide rod is arranged in the low pressure cylinder, and the guide rod is connected with the piston rod through a connecting piece.
Preferably, one end of the flushing rod is connected with a flushing head, and the other end of the flushing rod is connected with a piston rod in the high-pressure cylinder.
Preferably, the bottom of the high-pressure cylinder is provided with a high-pressure cylinder supporting device for supporting the whole high-pressure cylinder body.
Preferably, a bleed valve is arranged on one side of the low pressure cylinder, and the bleed valve is connected with a bleed port and is used for discharging gas in the detection steel pipe.
Preferably, a pressure sensor is arranged on the high-pressure cylinder.
Preferably, the first guide sleeve, the second guide sleeve and the third guide sleeve are all made of copper.
The invention has the advantages and positive effects that:
1. the inner diameter of the last layer of guide sleeve, namely the first guide sleeve, of the flushing rod is increased to 220.5mm, so that the flushing rod does not play a guiding role, only plays a supporting and sealing role, and is changed from the original three-point support to the two-point support. Because only two points exist, the problem of coaxiality deviation is solved, even if the guide sleeve is worn slightly, the rollback of the flushing head is not influenced, the problem of spare part precision is reduced, and meanwhile, the stability is improved.
2. The installation size of the high-pressure sealing group is changed into clearance fit, the problem that the flushing head cannot be retracted is solved, and the problem that the clearance amount is high in installation and the maintenance process increases considerable difficulty due to the fact that the high-pressure sealing combination in the flushing device is dynamic sealing is avoided.
3. The first guide sleeve, the second guide sleeve and the third guide sleeve are all made of copper materials, so that abrasion to the flushing rod is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure:
1. high-pressure cylinder 2, front cylinder body 3 and flushing rod guiding device
4. Low pressure cylinder 5, sealing compression block 6 and connecting gland
7. Pressure testing ring 8, flushing head moving cylinder 9 and cylinder base
11. Piston rod 12, high pressure cylinder support device 13, and pressure sensor
31. First guide sleeve 32, second guide sleeve 33, third guide sleeve
34. Coupling block 35, sealing group 36, flushing lever
41. Guide rod 42, low pressure cylinder support device 43, and purge valve
Detailed Description
As shown in fig. 1, this example is a water pressure flushing pressure test device, including the high-pressure cylinder 1 that sets gradually, preceding cylinder body 2, flushing rod guider 3 and sealed compact heap 5, high-pressure cylinder 1 passes through the connecting piece 34 with preceding cylinder body 2 and is connected, flushing rod guider 3 sets up in the inside of high-pressure cylinder 1 and preceding cylinder body 2, flushing rod guider 3 inside sets up flushing rod 36, flushing rod guider 3 outside sets up first guide pin bushing 31, second guide pin bushing 32, third guide pin bushing 33 and sealed group 35, first guide pin bushing internal diameter is 220.5mm, through the internal diameter with the last layer guide pin bushing of flushing rod, first guide pin bushing 31 increases to 220.5mm, make it play the guide effect, only play support seal effect, change into two point support from original three point support. Because only two points exist, the problem of coaxiality deviation is solved, even if the guide sleeve is worn slightly, the rollback of the flushing head is not influenced, the problem of spare part precision is reduced, and meanwhile, the stability is improved.
The first guide sleeve 31, the second guide sleeve 32 and the third guide sleeve 33 are all made of copper materials, abrasion to the flushing rod 36 is reduced, the first guide sleeve 31, the second guide sleeve 32 and the sealing group 35 are arranged between the outer surface of the flushing rod 36 and the inner surface of the high-pressure cylinder 1, the installation size of the high-pressure sealing group 35 is changed into clearance fit, the problem that the flushing rod cannot retract is solved, the problem that the high-pressure sealing group 35 in the flushing device is combined into dynamic sealing is avoided, the clearance requirement is higher during installation, the considerable difficulty is increased in the maintenance process, the third guide sleeve 33 is arranged between the outer surface of the flushing rod 36 and the inner surface of the front cylinder body 2, the flushing head moving cylinder 8 is fixedly arranged at the bottom of the front cylinder body 2, one side of the flushing head moving cylinder 8 is fixedly connected with the connecting block 34 through a base, one side of the flushing head moving cylinder 8 is fixedly connected with the cylinder base 9, one end of the flushing rod 36 is connected with the flushing head, the other end of the flushing rod 36 is connected with the piston rod 11 inside the high-pressure cylinder 1, all high-pressure water enters into a pipe body through the inside the flushing rod 36, the processing precision is very high, the clearance requirement is higher than the high in the size, the rigidity requirement is higher in the accuracy, the straightness accuracy is higher, the accuracy is required, the straightness accuracy is higher, the surface is good, and the like, and the accuracy is good, in order to have good requirements, and the accuracy is good, and the like, and good, and the like. The bottom of the high-pressure cylinder 1 is provided with a high-pressure cylinder supporting device 12 for supporting the whole high-pressure cylinder body, and the high-pressure cylinder 1 is provided with a pressure sensor 13 for measuring the pressure in the detection process.
Still include low pressure jar 4, low pressure jar 4 is connected through connecting gland 6 with high pressure jar 1, and the outside of connecting gland 6 sets up pressure testing ring 7, and the bottom of low pressure jar 4 sets up low pressure jar strutting arrangement 42, and low pressure jar strutting arrangement 42 is used for supporting low pressure jar 4, and the low pressure jar strutting arrangement of this example adopts the supporting structure, and low pressure jar 4 is inside to set up guide arm 41, guide arm 41 pass through the connecting piece with piston rod connects 11, and one side of low pressure jar 4 sets up bleed valve 43, and bleed valve 43 connects the relief vent for the gas in the discharge detection steel pipe.
The working procedure of this example: before the pressure test, the steel pipe that awaits measuring carries out the length measurement through hydraulic press length measuring station, and the steel pipe after the length measurement is transported to the pressure test station through walking beam, and during the pressure test, the steel pipe both ends adopt big clearance sealing washer, have guaranteed to seal the steel pipe effectively during the pressure test, and the pressure test frame rises, and anchor clamps clamp steel pipe, rises to appointed station back water flushing head, exhaust head advance to appointed position, and pre-seal booster begins the pressure boost, carries out all high-pressure water afterwards and gets into in the body that awaits measuring through the inside bath pole, the bath is discharged. After the pressure is over, the inside of the main booster is boosted by the high-pressure cylinder until the boosting and pressure maintaining are over. After the pressure test is finished, the walking beam moves the steel pipe to the water blowing station, one end of the steel pipe is lifted by the hydraulic cylinder, automatic water blowing is started, and after the water in the pipe body is dried, the original position is restored. And the walking beam moves the steel pipe to the discharging rack, and the water pressure drift diameter test of the steel pipe is finished.
The beneficial effects of the invention are as follows:
1. the inner diameter of the last layer of guide sleeve, namely the first guide sleeve, of the flushing rod is increased to 220.5mm, so that the flushing rod does not play a guiding role, only plays a supporting and sealing role, and is changed from the original three-point support to the two-point support. Because only two points exist, the problem of coaxiality deviation is solved, even if the guide sleeve is worn slightly, the rollback of the flushing head is not influenced, the problem of spare part precision is reduced, and meanwhile, the stability is improved.
2. The installation size of the high-pressure sealing group is changed into clearance fit, the problem that the flushing head cannot be retracted is solved, and the problem that the clearance amount is high in installation and the maintenance process increases considerable difficulty due to the fact that the high-pressure sealing combination in the flushing device is dynamic sealing is avoided.
3. The first guide sleeve, the second guide sleeve and the third guide sleeve are all made of copper materials, so that abrasion to the flushing rod is reduced.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (1)
1. The utility model provides a hydraulic press bath pressure testing device which characterized in that: the novel water flushing device comprises a high-pressure cylinder, a front cylinder body, a flushing rod guide device and a sealing compression block which are sequentially arranged, wherein the high-pressure cylinder is connected with the front cylinder body through a connecting block, the flushing rod guide device is arranged in the high-pressure cylinder and the front cylinder body, a flushing rod is arranged in the flushing rod guide device, a first guide sleeve, a second guide sleeve, a third guide sleeve and a sealing group are arranged outside the flushing rod guide device, the first guide sleeve, the second guide sleeve and the sealing group are arranged between the outer surface of the flushing rod and the inner surface of the high-pressure cylinder, and the third guide sleeve is arranged between the outer surface of the flushing rod and the inner surface of the front cylinder body;
the bottom of the front cylinder body is provided with a water flushing head moving cylinder, one side of the water flushing head moving cylinder is fixedly connected with the connecting block through a base, and the other side of the water flushing head moving cylinder is fixedly connected with an oil cylinder base;
the inner diameter of the first guide sleeve is 220.5mm;
the low-pressure cylinder is connected with the high-pressure cylinder through a connecting gland, and a pressure testing ring is arranged outside the connecting gland;
the bottom of the low pressure cylinder is provided with a low pressure cylinder supporting device, a guide rod is arranged in the low pressure cylinder, and the guide rod is connected with a piston rod through a connecting piece;
one end of the flushing rod is connected with a flushing head, and the other end of the flushing rod is connected with a piston rod in the high-pressure cylinder;
the bottom of the high-pressure cylinder is provided with a high-pressure cylinder supporting device for supporting the whole high-pressure cylinder body;
one side of the low pressure cylinder is provided with a gas release valve which is connected with a gas release port and used for discharging gas in the detection steel pipe;
a pressure sensor is arranged on the high-pressure cylinder;
the first guide sleeve, the second guide sleeve and the third guide sleeve are all made of copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710954825.0A CN107843500B (en) | 2017-10-13 | 2017-10-13 | Flushing pressure testing device of hydraulic press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710954825.0A CN107843500B (en) | 2017-10-13 | 2017-10-13 | Flushing pressure testing device of hydraulic press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107843500A CN107843500A (en) | 2018-03-27 |
| CN107843500B true CN107843500B (en) | 2024-03-26 |
Family
ID=61661342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710954825.0A Active CN107843500B (en) | 2017-10-13 | 2017-10-13 | Flushing pressure testing device of hydraulic press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107843500B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3587294A (en) * | 1968-04-09 | 1971-06-28 | Schloemann Ag | Rotary tube-testing presses |
| CN201637548U (en) * | 2010-04-09 | 2010-11-17 | 太原重工股份有限公司 | Stress frame of steel tube hydrostatic tester |
| CN102042935A (en) * | 2010-10-29 | 2011-05-04 | 马利芳 | Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition |
| CN103711744A (en) * | 2013-12-31 | 2014-04-09 | 一重集团大连设计研究院有限公司 | Horizontal split-structure large-stroke plunger cylinder |
| CN104865132A (en) * | 2015-05-22 | 2015-08-26 | 西安天宇重工有限公司 | Internal-pulling type ultrahigh-pressure hydraulic pressure testing machine for large-diameter steel pipe and hydraulic system of hydraulic pressure testing machine |
| CN105372134A (en) * | 2015-12-09 | 2016-03-02 | 中国重型机械研究院股份公司 | Supercharging system integrated steel pipe hydrostatic testing machine water-filling apparatus |
| CN206112097U (en) * | 2016-09-19 | 2017-04-19 | 天津钢管集团股份有限公司 | Petroleum casing pipe static pressure type hydrostatic testing machine high pressure fills valve |
| CN208024643U (en) * | 2017-10-13 | 2018-10-30 | 中冶天工集团天津有限公司 | A kind of hydraulic press flushometer |
-
2017
- 2017-10-13 CN CN201710954825.0A patent/CN107843500B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3587294A (en) * | 1968-04-09 | 1971-06-28 | Schloemann Ag | Rotary tube-testing presses |
| CN201637548U (en) * | 2010-04-09 | 2010-11-17 | 太原重工股份有限公司 | Stress frame of steel tube hydrostatic tester |
| CN102042935A (en) * | 2010-10-29 | 2011-05-04 | 马利芳 | Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition |
| CN103711744A (en) * | 2013-12-31 | 2014-04-09 | 一重集团大连设计研究院有限公司 | Horizontal split-structure large-stroke plunger cylinder |
| CN104865132A (en) * | 2015-05-22 | 2015-08-26 | 西安天宇重工有限公司 | Internal-pulling type ultrahigh-pressure hydraulic pressure testing machine for large-diameter steel pipe and hydraulic system of hydraulic pressure testing machine |
| CN105372134A (en) * | 2015-12-09 | 2016-03-02 | 中国重型机械研究院股份公司 | Supercharging system integrated steel pipe hydrostatic testing machine water-filling apparatus |
| CN206112097U (en) * | 2016-09-19 | 2017-04-19 | 天津钢管集团股份有限公司 | Petroleum casing pipe static pressure type hydrostatic testing machine high pressure fills valve |
| CN208024643U (en) * | 2017-10-13 | 2018-10-30 | 中冶天工集团天津有限公司 | A kind of hydraulic press flushometer |
Non-Patent Citations (1)
| Title |
|---|
| The Rational Choice of Not Applying Project Risk Management in Information Technology Projects;Elmar Kutsch;《Project Management Journal》;20091231;全文 * |
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|---|---|
| CN107843500A (en) | 2018-03-27 |
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