CN105569696A - Extra-large flow high-pressure erosion-control pressure control valve for hydraulic support - Google Patents
Extra-large flow high-pressure erosion-control pressure control valve for hydraulic support Download PDFInfo
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- CN105569696A CN105569696A CN201610124326.4A CN201610124326A CN105569696A CN 105569696 A CN105569696 A CN 105569696A CN 201610124326 A CN201610124326 A CN 201610124326A CN 105569696 A CN105569696 A CN 105569696A
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- valve body
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- spool
- hole
- diameter end
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- 238000013016 damping Methods 0.000 claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 34
- 238000007789 sealing Methods 0.000 claims description 20
- 230000003628 erosive effect Effects 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 14
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000019771 cognition Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention provides an extra-large flow high-pressure erosion-control pressure control valve for a hydraulic support. The extra-large flow high-pressure erosion-control pressure control valve comprises a front half valve body, a rear half valve body, a valve element and a pre-tightening spring. Multiple unloading holes are evenly distributed in the middle cylinder wall of the front half valve body in the circumferential direction. The valve element is of a two-level step cylinder structure. The large diameter end of the valve element is in sliding seal fit with the inner cylinder wall of the front half valve body. The small diameter end of the valve element stretches into the rear half valve body and is in sliding seal fit with a center through hole in the sealed end of the front half valve body. The pre-tightening spring is located in the rear half valve body and located between a plug screw and a spring check block, and the spring check block is installed at the end of the small diameter end of the valve element. Multiple liquid-permeable damping holes are formed in the large diameter end of the valve element and evenly distributed in the valve element in the circumferential direction. A drainage protective sleeve is installed outside the front half valve body. A round chamfer is machined in an orifice in the inner side of each unloading hole. Each unloading hole is of a kidney-shaped structure. An elastic positioning pin is additionally arranged between the rear half valve body and the plug screw. The pressure control valve has the advantages of being small in size, large in flow and low in vibration.
Description
Technical field
The invention belongs to tunnel safety support technology field, particularly relate to a kind of hydraulic support super-flow high pressure erosion control pressure-control valve.
Background technology
In recent years, along with the continuous increase of coal mining depth, the incidence of bump is also increasing year by year, and in order to protect the safety of underground equipment and personnel, the hydraulic support as erosion control suspension device has just become last line of defense.
At present; for deep erosion control hydraulic support; in it, the cylinder diameter of hydraulic vertical prop reaches about 300mm ~ 350mm; when bump occurs; impact velocity can reach 1m/s ~ 2m/s; hydraulic vertical prop quick relief is now needed to allow pressure, to ensure the complete of underworkings, thus the safety of protection underground equipment and personnel.
The quick relief realizing hydraulic vertical prop is wanted to allow pressure, pressure-control valve is absolutely necessary, but existing pressure-control valve is subject to the restriction of self structure, the maximum off-load flow that can reach only has 1000L/min, and under the impact velocity of 1m/s ~ 2m/s, existing pressure-control valve cannot meet off-load traffic requirement, also just cannot realize quick relief and allow pressure, now very easily occur that hydraulic vertical prop bends, fracture and the dangerous situation such as bad seals, threatened the safety of underground equipment and personnel greatly.For this reason, the maximum off-load flow of pressure-control valve must be increased, but, want the structure continuing to use existing pressure-control valve, and meet maximum off-load traffic requirement by means of only the volume strengthening existing pressure-control valve, serious drawback will be there will be, because the volume of pressure-control valve increases, be subject to the restriction of himself structure, pressure-control valve carries out off-load allows vibration when pressing will be more violent, strong vibration can badly influence the functional reliability of pressure-control valve, so, the mode meeting maximum off-load traffic requirement by means of only the volume strengthening existing pressure-control valve is infeasible.Therefore, need the pressure-control valve designing a kind of brand new badly, it should have, and volume is little, flow is large and vibrate little feature.
Summary of the invention
For prior art Problems existing, the invention provides a kind of hydraulic support super-flow high pressure erosion control pressure-control valve, it has, and volume is little, flow is large and vibrate little feature.
To achieve these goals, the present invention adopts following technical scheme: a kind of hydraulic support super-flow high pressure erosion control pressure-control valve, and comprise first half valve body, later half valve body, spool and preloading spring, first half valve body is connected by screw thread with later half valve body; Described spool is positioned at first half valve body, and described preloading spring is positioned at later half valve body;
Described first half valve body adopts cylinder barrel shaped structure, first half valve body one end is openend, the first half valve body other end is blind end, first half valve body openings end is connected with the inner chamber of cylinder block of hydraulic vertical prop, offer a central through hole at first half valve body blind end, circumferentially uniformly on the barrel in the middle part of first half valve body offer some unloading holes;
Described spool adopts secondary stepped cylindrical body structure, and be divided into bigger diameter end and miner diameter end, spool bigger diameter end coordinates with the slipper seal of first half valve body inner tube wall, and spool bigger diameter end matches with unloading hole; Described spool miner diameter end is positioned at first half valve body blind end central through hole, and spool miner diameter end and central through hole seal and be slidably matched, and stretches out in central through hole to later half valve body outside spool miner diameter end;
Described later half valve body adopts cylinder barrel shaped structure, and later half valve body two ends are openend, and later half valve body one end is connected mutually by screw thread and first half valve body blind end, and the later half valve body other end is provided with plug screw; The termination of described spool miner diameter end is provided with spring block, and described preloading spring is fixedly installed between plug screw and spring block.
First half valve body inner tube wall outside described spool bigger diameter end has been threaded collar stop.
In described spool bigger diameter end, offer some transparent liquid damping holes, some longitudinal center lines of transparent liquid damping hole parallel with the longitudinal center line of spool, and the circumferential uniform setting on spool of some transparent liquid damping holes.
Described spool bigger diameter end outboard end is provided with the first sealing ring.
The central through hole inner hole wall of described first half valve body blind end is provided with the second sealing ring.
Inner tube wall between described unloading hole and first half valve body blind end is provided with the 3rd sealing ring.
In described first half valve body outside, discharge opeing protective jacket is installed, is stopped and water conservancy diversion by the ejection liquid of discharge opeing protective jacket to unloading hole.
Elastic positioning pin is added in the rear between half valve body and plug screw.
Inside described unloading hole, aperture is processed with rounded corner.
Described unloading hole adopts mounting hole structure.
Beneficial effect of the present invention:
(1) spool of the present invention have employed secondary stepped cylindrical body structure, when the highly pressurised liquid in hydraulic prop acts on spool bigger diameter end and miner diameter end simultaneously, due to the difference in areas that spool two ends exist, the actual bearing area of spool bigger diameter end will be caused to equal the sectional area of miner diameter end, the hydraulic coupling that now spool bears will significantly reduce, and required initial tension of spring also can correspondingly reduce, and then the preloading spring that volume is less can be selected, the final object realizing overall reduction pressure-control valve volume.
(2) circumferentially uniformly on barrel in the middle part of first half valve body of the present invention some unloading holes are offered, first half valve body radially stress balance in unloading process can be ensured, and ensure that valve core movement is flexible, realize, in unloading process, there is maximum flow section simultaneously, to realize super-flow off-load, its maximum instantaneous off-load flow can reach 10000L/min.
(3) inside unloading hole of the present invention, aperture is processed with rounded corner, spool unloading hole inboard aperture injury of mouth first sealing ring in motion process can be avoided, and due to the uniform setting of some unloading holes, between some unloading holes, then just define some grids of uniform setting, first sealing ring is limited in core sealing groove firmly under some grids stops, avoids in high speed unloading process because core sealing groove and impaired given prominence to by the first sealing ring.
(4) first half valve body outside of the present invention is provided with discharge opeing protective jacket, stopped and water conservancy diversion by the ejection liquid of discharge opeing protective jacket to unloading hole, when pressure-control valve is in unloading condition, high pressure liquid is known from experience by unloading hole ejection at a high speed, if and the liquid sprayed at a high speed radially sprays the risk having and shoot people wounded, and after installing discharge opeing protective jacket additional, first the liquid of ejection is effectively stopped, and then conducting fluid make it draw off vertically, effectively reduce risk of hurting sb.'s feelings.
(5) when pressure-control valve is in unloading condition, spool can move back and forth in first half valve body, high pressure liquid cognition back and forth flows in transparent liquid damping hole simultaneously, and damping action is played to spool, by the quantity of adjustment transparent liquid damping hole, aperture and hole depth, the all right damped coefficient of regulating spool in motion process, and make spool reach Optimal damping ratio, significantly to improve the vibration characteristics of spool in unloading process.
Accompanying drawing explanation
Fig. 1 is hydraulic support super-flow high pressure erosion control pressure-control valve structural representation of the present invention;
Fig. 2 is hydraulic support super-flow high pressure erosion control pressure-control valve (unloading condition) structural representation of the present invention;
Fig. 3 is first half valve body structure schematic diagram of the present invention;
Fig. 4 is A-A sectional view in Fig. 3;
Fig. 5 is I portion enlarged drawing in Fig. 4;
Fig. 6 is valve core structure schematic diagram of the present invention;
Fig. 7 is the right view of Fig. 6;
In figure, 1-first half valve body, 2-later half valve body, 3-spool, 4-preloading spring, 5-central through hole, 6-unloading hole, 7-plug screw, 8-spring block, 9-collar stop, 10-transparent liquid damping hole, the 11-the first sealing ring, 12-the second sealing ring, the 13-the three sealing ring, 14-discharge opeing protective jacket, 15-elastic positioning pin, 16-rounded corner, 17-grid.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Fig. 1 ~ 7, a kind of hydraulic support super-flow high pressure erosion control pressure-control valve, comprise first half valve body 1, later half valve body 2, spool 3 and preloading spring 4, first half valve body 1 is connected by screw thread with later half valve body 2; Described spool 3 is positioned at first half valve body 1, and described preloading spring 4 is positioned at later half valve body 2;
Described first half valve body 1 adopts cylinder barrel shaped structure, first half valve body 1 one end is openend, first half valve body 1 other end is blind end, first half valve body 1 openend is connected with the inner chamber of cylinder block of hydraulic vertical prop, offer a central through hole 5 at first half valve body 1 blind end, circumferentially uniformly on the barrel in the middle part of first half valve body 1 offer some unloading holes 6;
The uniform setting of some unloading holes 6 can ensure first half valve body 1 radially stress balance in unloading process, and ensure that spool 3 moves flexibly, realize having maximum flow section in unloading process, to realize super-flow off-load, its maximum instantaneous off-load flow can reach 10000L/min simultaneously.
Described spool 3 adopts secondary stepped cylindrical body structure, is divided into bigger diameter end and miner diameter end, and spool 3 bigger diameter end coordinates with the slipper seal of first half valve body 1 inner tube wall, and spool 3 bigger diameter end matches with unloading hole 6; Described spool 3 miner diameter end is positioned at first half valve body 1 blind end central through hole 5, and spool 3 miner diameter end and central through hole 5 seal and be slidably matched, and stretches out central through hole 5 outside spool 3 miner diameter end in later half valve body 2;
Described later half valve body 2 adopts cylinder barrel shaped structure, and later half valve body 2 two ends are openend, and later half valve body 2 one end is connected mutually by screw thread and first half valve body 1 blind end, and later half valve body 2 other end is provided with plug screw 7; The termination of described spool 3 miner diameter end is provided with spring block 8, and described preloading spring 4 is fixedly installed between plug screw 7 and spring block 8.By the precession amount of adjustment plug screw 7, can adjust the decrement of preloading spring 4, and then realize the adjustment to initial tension of spring, thus meet the adjustment to spool 3 opening pressure.
Because spool 3 have employed secondary stepped cylindrical body structure, when the highly pressurised liquid in hydraulic prop acts on spool 3 bigger diameter end and miner diameter end simultaneously, due to the difference in areas that spool 3 two ends exist, the actual bearing area of spool 3 bigger diameter end will be caused to equal the sectional area of miner diameter end, the hydraulic coupling that now spool 3 bears will significantly reduce, and required initial tension of spring also can correspondingly reduce, and then the preloading spring that volume is less can be selected, the final object realizing overall reduction pressure-control valve volume.Have again, the off-load runner of existing pressure-control valve all can through the installation cavity of preloading spring, in unloading process, highly pressurised liquid must produce exciting effect to preloading spring when flow at high speed, this is also the vibrative main reason of spool, and highly pressurised liquid of the present invention does not flow through the installation cavity of preloading spring, but is directly discharged by unloading hole 6, preloading spring no longer produces exciting effect, thus drops to minimum by the vibration of spool 3.
First half valve body 1 inner tube wall outside described spool 3 bigger diameter end has been threaded collar stop 9.
In described spool 3 bigger diameter end, offer some transparent liquid damping holes 10, the longitudinal center line of some transparent liquid damping holes 10 parallels with the longitudinal center line of spool 3, and the circumferential uniform setting on spool 3 of some transparent liquid damping holes 10.
When pressure-control valve is in unloading condition, spool 3 can move back and forth in first half valve body 1, and high pressure liquid knows from experience back and forth flowing in transparent liquid damping hole 10 simultaneously, and plays damping action to spool 3.Further, by the quantity of adjustment transparent liquid damping hole 10, aperture and hole depth, can also the damped coefficient of regulating spool 3 in motion process, and make spool 3 reach Optimal damping ratio, significantly to improve the vibration characteristics of spool 3 in unloading process.
Described spool 3 bigger diameter end outboard end is provided with the first sealing ring 11.
Central through hole 5 inner hole wall of described first half valve body 1 blind end is provided with the second sealing ring 12.
Inner tube wall between described unloading hole 6 and first half valve body 1 blind end is provided with the 3rd sealing ring 13.
In described first half valve body 1 outside, discharge opeing protective jacket 14 is installed, is stopped and water conservancy diversion by the ejection liquid of discharge opeing protective jacket 14 pairs of unloading holes 6.
When pressure-control valve is in unloading condition, high pressure liquid is known from experience by unloading hole 6 ejection at a high speed, if and the liquid sprayed at a high speed radially sprays the risk having and shoot people wounded, therefore, after installing discharge opeing protective jacket 14 additional, first the liquid of ejection is effectively stopped, and then conducting fluid make it draw off vertically, effectively reduce risk of hurting sb.'s feelings.
Elastic positioning pin 15 is added in the rear between half valve body 2 and plug screw 7.In pressure-control valve unloading process, because vibration may cause plug screw 7 to loosen, after installing elastic positioning pin 15 additional, plug screw 7 just can not loosen because of vibration, effectively ensure that the operation stability of pressure-control valve.
Inside described unloading hole 6, aperture is processed with rounded corner 16.
Due to the existence of rounded corner 16, spool 3 unloading hole 6 inboard aperture injury of mouth first sealing ring 11 in motion process can be avoided.Have again, due to the uniform setting of some unloading holes 6, between some unloading holes 6, then just define some grids 17 of uniform setting, first sealing ring 11 is limited in firmly in spool 3 seal groove under some grids 17 stops, avoids in high speed unloading process because spool 3 seal groove and impaired given prominence to by the first sealing ring 11.
Described unloading hole 6 adopts mounting hole structure.
Below in conjunction with accompanying drawing, operating principle of the present invention is described:
Pressure-control valve of the present invention is connected with hydraulic vertical prop by snap joint, first highly pressurised liquid in hydraulic vertical prop enters in first half valve body 1, and be full of first half valve body 1, now highly pressurised liquid acts on spool 3 two ends simultaneously, because spool 3 two ends exist difference in areas, the actual bearing area of spool 3 bigger diameter end equals the sectional area of miner diameter end, namely hydraulic coupling practical function area just equals the sectional area of spool 3 miner diameter end, when there is not bump, hydraulic coupling is less than the initial tension of spring of preloading spring 4, spool 3 is failure to actuate, and unloading hole 6 is by spool 3 shutoff.
When bump occurs, in hydraulic vertical prop, the pressure of liquid raises rapidly, and the hydraulic coupling that spool 3 bears exceedes initial tension of spring, and spool 3 starts to move and compresses preloading spring 4, unloading hole 6 exposes gradually simultaneously, and now high pressure liquid cognition is discharged by unloading hole 6 immediately.Because off-load flow is relevant with the intensity of bump, bump is larger, and the hydraulic coupling in hydraulic vertical prop is larger, and the displacement of spool 3 is also larger, and then the area that unloading hole 6 is exposed is also larger, and its instantaneous off-load flow is larger.When unloading hole 6 all exposes, namely pressure-control valve reaches maximum instantaneous off-load flow, can reach 10000L/min according to designing requirement, meets present stage " quick relief allow pressure " requirement completely.
Scheme in embodiment is also not used to limit scope of patent protection of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and is all contained in the scope of the claims of this case.
Claims (10)
1. a hydraulic support super-flow high pressure erosion control pressure-control valve, is characterized in that: comprise first half valve body, later half valve body, spool and preloading spring, first half valve body is connected by screw thread with later half valve body; Described spool is positioned at first half valve body, and described preloading spring is positioned at later half valve body;
Described first half valve body adopts cylinder barrel shaped structure, first half valve body one end is openend, the first half valve body other end is blind end, first half valve body openings end is connected with the inner chamber of cylinder block of hydraulic vertical prop, offer a central through hole at first half valve body blind end, circumferentially uniformly on the barrel in the middle part of first half valve body offer some unloading holes;
Described spool adopts secondary stepped cylindrical body structure, and be divided into bigger diameter end and miner diameter end, spool bigger diameter end coordinates with the slipper seal of first half valve body inner tube wall, and spool bigger diameter end matches with unloading hole; Described spool miner diameter end is positioned at first half valve body blind end central through hole, and spool miner diameter end and central through hole seal and be slidably matched, and stretches out in central through hole to later half valve body outside spool miner diameter end;
Described later half valve body adopts cylinder barrel shaped structure, and later half valve body two ends are openend, and later half valve body one end is connected mutually by screw thread and first half valve body blind end, and the later half valve body other end is provided with plug screw; The termination of described spool miner diameter end is provided with spring block, and described preloading spring is fixedly installed between plug screw and spring block.
2. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: the first half valve body inner tube wall outside described spool bigger diameter end has been threaded collar stop.
3. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, it is characterized in that: in described spool bigger diameter end, offer some transparent liquid damping holes, some longitudinal center lines of transparent liquid damping hole parallel with the longitudinal center line of spool, and the circumferential uniform setting on spool of some transparent liquid damping holes.
4. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: in described spool bigger diameter end outboard end, be provided with the first sealing ring.
5. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: on the central through hole inner hole wall of described first half valve body blind end, be provided with the second sealing ring.
6. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: the inner tube wall between described unloading hole and first half valve body blind end is provided with the 3rd sealing ring.
7. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, be is characterized in that: be provided with discharge opeing protective jacket in described first half valve body outside, is stopped and water conservancy diversion by the ejection liquid of discharge opeing protective jacket to unloading hole.
8. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: add elastic positioning pin between half valve body and plug screw in the rear.
9. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: inside described unloading hole, aperture is processed with rounded corner.
10. a kind of hydraulic support super-flow high pressure erosion control pressure-control valve according to claim 1, is characterized in that: described unloading hole adopts mounting hole structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610124326.4A CN105569696A (en) | 2016-03-04 | 2016-03-04 | Extra-large flow high-pressure erosion-control pressure control valve for hydraulic support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610124326.4A CN105569696A (en) | 2016-03-04 | 2016-03-04 | Extra-large flow high-pressure erosion-control pressure control valve for hydraulic support |
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| CN105569696A true CN105569696A (en) | 2016-05-11 |
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|---|---|---|---|
| CN201610124326.4A Pending CN105569696A (en) | 2016-03-04 | 2016-03-04 | Extra-large flow high-pressure erosion-control pressure control valve for hydraulic support |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522996A (en) * | 2017-01-20 | 2017-03-22 | 山东科技大学 | Adjustable convergence confinement device and method for large underground construction strong rigid support |
| CN107061814A (en) * | 2017-04-11 | 2017-08-18 | 安徽理工大学 | A kind of six measuring point rotating disc type pressure meter switches |
| CN107803782A (en) * | 2017-11-24 | 2018-03-16 | 柳州上汽汽车变速器有限公司柳东分公司 | A kind of hydraulic packing plug assembles device |
| CN109027352A (en) * | 2018-08-21 | 2018-12-18 | 合肥力威汽车油泵有限公司 | Pressure actuated valve |
| CN109322689A (en) * | 2018-10-31 | 2019-02-12 | 辽宁工程技术大学 | A kind of erosion control hydraulic support pressure flow function control valve group |
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