CN203685229U - Hydraulic three-way valve for single hydraulic prop - Google Patents
Hydraulic three-way valve for single hydraulic prop Download PDFInfo
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- CN203685229U CN203685229U CN201320773345.1U CN201320773345U CN203685229U CN 203685229 U CN203685229 U CN 203685229U CN 201320773345 U CN201320773345 U CN 201320773345U CN 203685229 U CN203685229 U CN 203685229U
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Abstract
The utility model discloses a hydraulic three-way valve for a single hydraulic prop, belongs to the technical field of single hydraulic prop control valves. The hydraulic three-way valve comprises a left valve cylinder, a right valve cylinder, a non-return valve part and a safety valve part, wherein the non-return valve part comprises a cone valve core; the safety valve part comprises a safety valve needle; uniformly distributed micron-sized tiny pits or grooves are processed in the cone valve core and the safety valve needle; the cone valve core adopts a secondary throttling structure; a high-pressure drainage through hole is formed in the center of the cone valve core; the non-return valve part further comprises a non-return valve seat; the safety valve part further comprises a safety valve seat and a sexangular guide sleeve; engineering ceramic, treated by thermal spraying, covers the surfaces of the non-return valve seat, the safety valve needle, the safety valve seat and the hexagonal guide sleeve. The hydraulic three-way valve can utilize water as a medium, is pollution-resistant and abrasion-resistant, can effectively eliminate cavitation and reduce vibration and noise, and is safe, environment-friendly, and high in adaptability.
Description
Technical field
The utility model relates to hydraulic prop control valve technical field, is specifically related to a kind of hydraulic prop hydraulic pressure triple-use valve.
Background technology
Hydraulic prop is a kind of support equipment of new environment-friendly type, because its setting load is large and evenly, the advantage of distance falls in the perseverance increasing resistance that can realize pillar, in coal industry field, obtain application widely, according to incompletely statistics, the annual requirement of China's hydraulic prop has exceeded 1,200,000, is the country that uses in the world hydraulic prop maximum.
Conventional hydraulic medium is taking hydraulic oil as main, but due to the shortcoming such as non-renewable, contaminated environment, easy firing of hydraulic oil, impels people actively to find the alternative working media of hydraulic oil.Traditional colliery single-body hydraulic prop is using emulsion as working media, emulsion is to be mixed by a certain percentage by oil emulsion and water, select as the case may be the model of different oil emulsions and the ratio of mixing, emulsion easily impels bacterium, mold propagates, and cause active ingredient in emulsion to produce chemical breakdown and spoiled, rotten, the also serious environment pollution of direct discharge of emulsion, uses emulsifier cost higher.
The advantage such as glassware for drinking water has that dynamic property is good, clean hygiene, safety are good, this makes Hydraulic Drive Technology because cost of production is low, cost of use is low, applied range and have great market potential, and water hydraulics has been widely used in the industrial application such as food, papermaking, weaving, mining, medicine equipment, fire-fighting, metallurgy, atomic power factory, ocean development at present.But the physics and chemistry shortcoming of water is that viscosity is low, poor lubricity, electric conductivity is strong, pressure for vaporization is high, easily produce cavitation erosion.Also do not have at present reliable ripe hydraulic pressure hydraulic prop product to come out, existing coal mine individual hydraulic prop product is to be all that emulsion designs production for working media, can not effectively solve due to the problem such as wearing and tearing, pollution, application life that the variation of working media produces is short.
At the disclosed application number of Chinese patent application: disclose a kind of single bottom prop liquid-discharging reclaiming and utilization device in 200820187435.1 patent, on monomer cylinder, triple-use valve is installed, the unloader valve port place of triple-use valve is connected with drain bend pipe by jointing, the other end of drain bend pipe is connected with sebific duct by rubber hose coupling, the other end of sebific duct is communicated with the top of emulsion box, and the upper end of emulsion box is with case lid.In emulsion box, be fixedly connected with precipitation dividing plate, magnetic filter stick and screen pack; The bottom of emulsion box is provided with imbibition head, and imbibition head is connected with emulsion pump by sebific duct, and emulsion pump is connected with motor; The liquid outlet of emulsion pump is connected with fluid injection gun by sebific duct.The problems such as this technical scheme has been alleviated the problem that emulsion pollutes to a certain extent, but does not fundamentally solve the wearing and tearing that use emulsion to bring, and application life is short; Owing to having increased retracting device, use also inconvenience, also increase cost.
At the disclosed application number of Chinese patent application: disclose a kind of mine individual hydraulic prop in the patent of 201020526687.X, it mainly comprises top cover, triple-use valve, plunger end, plunger tube, cylinder body, piston, base, be lined with plastic pipe at plunger tube inner surface, there is the flange of machine-shaping on plastic pipe top, flange is in plunger end and plunger tube junction, plunger end press flange forms sealing, plastic pipe lower end and piston junction have through hole enlargement moulding with the corresponding seal groove of plunger tube inwall toroidal cavity, this technical scheme can adopt water as working media, environment is not polluted, but this technical scheme does not solve the problem of utilizing cavitation erosion, vibration and noise that water brings as medium.
At the disclosed application number of Chinese patent application: disclose a kind of mining anticorrosion single hydraulic prop in 201220459995.4 patent, belong to mine equipment field, in structure by cylinder component, column assembly alive, triple-use valve, piston, sealing ring, top cover, base, handle body, valve seat, the parts such as back-moving spring, piston, the column assembly of living is arranged at the inside of cylinder component, and piston is arranged on the bottom of column assembly alive, cylinder component, the column assembly of living is fixing by handle body and foundry goods assembling, valve seat is welded on column assembly alive, in valve seat, be provided with triple-use valve, column assembly alive in the middle of handle body and top cover is fixed a sleeve outward, cylinder component inside, the column assembly of living all adopts the compound alloy pipe forming of stainless steel, this technical scheme can improve abrasion resistance to a certain extent, but inevitable component surface friction can not be held because the abrasive dust that boundary lubrication or dry friction produce.
Utility model content
For the problems referred to above, the utility model provides one can utilize water as medium, both antipollution, resistance to wear, can effectively solve again cavitation erosion, reduce vibration and the hydraulic prop hydraulic pressure triple-use valve of noise.
In order to address the above problem, the scheme that the utility model provides is:
A kind of hydraulic prop hydraulic pressure triple-use valve, comprises left valve cylinder, right valve cylinder, one way valve part, safety valve part; Described one way valve part comprises poppet valve core, and described safety valve part comprises safe needle; On the external surface of described poppet valve core and safe needle, be processed with respectively some micron order grooves.
Preferably, described groove is evenly distributed.
Preferably, described groove is small pit or groove.Small pit or groove can be used as micro-storage pool of lubrication oil or the nail collection slot of abrasive dust, for boundary lubrication provides lubricated or provides lubricated for the friction surface just starting, hold because the abrasive dust that boundary lubrication or dry friction produce, thereby reduce wear, increase the service life, make pure water triple-use valve there is high-wearing feature and resistance tocrocking.
Preferably, described small pit is cylindrical.
Preferably, described poppet valve core is two-step throttle structure, and between one-way valve seat, forms two settable orifices of connecting, and pressure drop when work on one way valve is born by two restrictions, thereby has improved the operating pressure of hydraulic pressure triple-use valve.
Preferably, on described poppet valve core, have through hole.
Preferably, described through hole is opened in poppet valve core in the heart, utilizes high-pressure induct bundle to affect main flow bundle, can effectively suppress cavitation erosion, reduce vibration and noise.
Preferably, described one way valve part also comprises one-way valve seat, and described safety valve part also comprises valve base of safety valve, hexagonal fairlead; The surface of described one-way valve seat, safe needle, valve base of safety valve, hexagonal fairlead is all coated with the engineering ceramics through thermal spraying treatment.
Compared with prior art, the utlity model has following beneficial effect:
1, the structure that provides a kind of novel antipollution to resistance to wear environment-friendly type colliery hydraulic prop hydraulic pressure triple-use valve, than traditional triple-use valve, has the advantages such as safety and environmental protection, cheap and strong adaptability;
2,, by the surface micro-moulding structure design to triple-use valve poppet valve core and safe needle, provide a kind of novel valve core structure, the advantage such as there is antipollution, resistance to wear;
3, for the particularity of aqueous medium, adopt new construction, new material, efficiently solve the problems such as cavitation erosion that hydraulic prop hydraulic pressure triple-use valve exists, vibration, noise, improve the overall performance of triple-use valve.
Brief description of the drawings
Fig. 1 is sectional view of the present utility model;
Fig. 2 is the local enlarged diagram of cylindrical small pit micro forming poppet valve core of the present utility model;
Fig. 3 is the local enlarged diagram of small groove micro forming poppet valve core of the present utility model;
Fig. 4 is the structural representation of the safe needle of cylindrical small pit micro forming of the present utility model;
Fig. 5 is the structural representation of the safe needle of small channel shaped micro forming of the present utility model;
Enlarged diagram when Fig. 6 is poppet valve core assembling of the present utility model;
Enlarged diagram when Fig. 7 is valve base of safety valve of the present utility model, safe needle, the assembling of safe valve pad.
In figure: 1, left valve cylinder, 2, fluid injection valve body, 3, stop collar, 4, one-way valve seat, 5, gland nut, 6, poppet valve core, 7, one-way valve spring, 8, unloading valve pad, 9, feather valve spring, 10, connecting screw rod, 11, safety-valve sleeve, 12, valve base of safety valve, 13, valve base of safety valve sealing ring, 14, safety-valve sleeve sealing ring, 15, safe needle, 16, safe valve pad, 17, valve cylinder sealing ring, 18, hexagonal fairlead, 19, steel ball, 20, spring base, 21, safety valve spring, 22, voltage regulation screw, 23, right valve cylinder, 24, inlet, 25, through hole, 26, spool bore, 27, interstitial hole, 28, radial hole, 29, liquid outlet, 30, axial hole, 31, centre bore, 32, unload liquid mouth.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described further:
In conjunction with Fig. 1, Fig. 2, Fig. 5, Fig. 6, Fig. 7, embodiment 1: a kind of hydraulic prop hydraulic pressure triple-use valve of the present utility model, comprise left valve cylinder 1, right valve cylinder 23, valve cylinder sealing ring 17, the mode that left valve cylinder 1 right side is threaded connection is connected with right valve cylinder 23 left sides, left valve cylinder 1 and right valve cylinder 23 outsides are respectively equipped with valve cylinder sealing ring 17, in left valve cylinder 1 and right valve cylinder 23, be provided with successively one way valve part, feather valve part, safety valve part, one way valve part right side is provided with feather valve part, and feather valve part right side is provided with safety valve part.
One way valve part comprises fluid injection valve body 2, stop collar 3, one-way valve seat 4, gland nut 5, poppet valve core 6 and one-way valve spring 7, in fluid injection valve body 2, be provided with stop collar 3, stop collar 3 right sides are provided with one-way valve seat 4, one-way valve seat 4 right sides are provided with poppet valve core 6, poppet valve core 6 right sides are provided with one-way valve spring 7, gland nut 5 is positioned at the outside of poppet valve core 6, and the mode that gland nut 5 is threaded connection is connected with fluid injection valve body 2.
Feather valve part comprises unloading valve pad 8, feather valve spring 9 and connecting screw rod 10, connecting screw rod 10 passes on left the mode being threaded and is connected with fluid injection valve body 2 right sides, unloading valve pad 8 is arranged on the junction of connecting screw rod 10 and fluid injection valve body 2, and feather valve spring 9 is positioned at the outside of connecting screw rod 10.
Safety valve part comprises safety-valve sleeve 11, valve base of safety valve 12, valve base of safety valve sealing ring 13, safety-valve sleeve sealing ring 14, safe needle 15, safe valve pad 16, hexagonal fairlead 18, steel ball 19, spring base 20, safety valve spring 21, voltage regulation screw 22, safety-valve sleeve 11 passes on left the mode being threaded and is connected with connecting screw rod 10 right sides, safety-valve sleeve 11 outsides are provided with safety-valve sleeve sealing ring 14, in safety-valve sleeve 11, be provided with valve base of safety valve 12, valve base of safety valve 12 outsides are provided with valve base of safety valve sealing ring 13, valve base of safety valve 12 right sides are provided with safe needle 15, safe needle 15 right sides are provided with safe valve pad 16, safe valve pad 16 right sides are provided with hexagonal fairlead 18, hexagonal fairlead 18 right sides are provided with steel ball, steel ball right side is provided with spring base 20, spring base 20 outsides are provided with safety valve spring 21, safety valve spring 21 right sides are provided with voltage regulation screw 22, the mode that voltage regulation screw 22 is threaded connection is connected with safety-valve sleeve 11 is inner.
Described inner elements of check valve adopts the poppet valve core 6 of polymorphic structure, can make current more smooth, alleviates cavitation erosion and vibration noise, increases the service life; Poppet valve core 6 is two-step throttle structure, and between one-way valve seat 4, forms two settable orifices of connecting, and pressure drop when work on one way valve is born by two restrictions, thereby has improved the operating pressure of hydraulic pressure triple-use valve; In addition, in poppet valve core 6, have in the heart high-pressure induct through hole 25, utilize high-pressure induct bundle to affect main flow bundle, can effectively suppress cavitation erosion, reduce vibration and noise.
On the external surface of one way valve poppet valve core 6 and safe needle 15, be processed with respectively some micron order grooves that are evenly distributed, the groove of one way valve poppet valve core 6 external surfaces is cylindrical small pit, and the groove of safe needle 15 external surfaces is small groove; Small pit or groove can be used as micro-storage pool of lubrication oil or the nail collection slot of abrasive dust, for boundary lubrication provides lubricated or provides lubricated for the friction surface just starting, hold because the abrasive dust that boundary lubrication or dry friction produce, thereby reduce wear, increase the service life, make hydraulic pressure triple-use valve there is high-wearing feature and resistance tocrocking.
Fluid injection valve body 2 inlet 24 diameters are 6mm.
Valve base of safety valve 12 centre bore 31 diameters are 2mm.
Left valve cylinder 1 and right valve cylinder 23 adopt 40Cr as its material, and intensity can double.
The material of one-way valve seat 4, safe needle 15, valve base of safety valve 12, hexagonal fairlead 18 all adopts Cr-Ni series cast steel ZG0Cr18Ni9, and its surface is all coated with the engineering ceramics through thermal spraying treatment, can improve its cavitation resistive property.
In conjunction with Fig. 1, Fig. 3, Fig. 4, Fig. 6, Fig. 7, embodiment 2: a kind of hydraulic prop hydraulic pressure triple-use valve, comprise left valve cylinder 1, right valve cylinder 23, valve cylinder sealing ring 17, the mode that left valve cylinder 1 right side is threaded connection is connected with right valve cylinder 23 left sides, left valve cylinder 1 and right valve cylinder 23 outsides are respectively equipped with valve cylinder sealing ring 17, in left valve cylinder 1 and right valve cylinder 23, be provided with successively one way valve part, feather valve part, safety valve part, one way valve part right side is provided with feather valve part, and feather valve part right side is provided with safety valve part.
One way valve part comprises fluid injection valve body 2, stop collar 3, one-way valve seat 4, gland nut 5, poppet valve core 6 and one-way valve spring 7, in fluid injection valve body 2, be provided with stop collar 3, stop collar 3 right sides are provided with one-way valve seat 4, one-way valve seat 4 right sides are provided with poppet valve core 6, poppet valve core 6 right sides are provided with one-way valve spring 7, gland nut 5 is positioned at the outside of poppet valve core 6, and the mode that gland nut 5 is threaded connection is connected with fluid injection valve body 2.
Feather valve part comprises unloading valve pad 8, feather valve spring 9 and connecting screw rod 10, connecting screw rod 10 passes on left the mode being threaded and is connected with fluid injection valve body 2 right sides, unloading valve pad 8 is arranged on the junction of connecting screw rod 10 and fluid injection valve body 2, and feather valve spring 9 is positioned at the outside of connecting screw rod 10.
Safety valve part comprises safety-valve sleeve 11, valve base of safety valve 12, valve base of safety valve sealing ring 13, safety-valve sleeve sealing ring 14, safe needle 15, safe valve pad 16, hexagonal fairlead 18, steel ball 19, spring base 20, safety valve spring 21, voltage regulation screw 22, safety-valve sleeve 11 passes on left the mode being threaded and is connected with connecting screw rod 10 right sides, safety-valve sleeve 11 outsides are provided with safety-valve sleeve sealing ring 14, in safety-valve sleeve 11, be provided with valve base of safety valve 12, valve base of safety valve 12 outsides are provided with valve base of safety valve sealing ring 13, valve base of safety valve 12 right sides are provided with safe needle 15, safe needle 15 right sides are provided with safe valve pad 16, safe valve pad 16 right sides are provided with hexagonal fairlead 18, hexagonal fairlead 18 right sides are provided with steel ball, steel ball right side is provided with spring base 20, spring base 20 outsides are provided with safety valve spring 21, safety valve spring 21 right sides are provided with voltage regulation screw 22, the mode that voltage regulation screw 22 is threaded connection is connected with safety-valve sleeve 11 is inner.
Described inner elements of check valve adopts the poppet valve core 6 of polymorphic structure, can make current more smooth, alleviates cavitation erosion and vibration noise, increases the service life; Poppet valve core 6 is two-step throttle structure, and between one-way valve seat 4, forms two settable orifices of connecting, and pressure drop when work on one way valve is born by two restrictions, thereby has improved the operating pressure of hydraulic pressure triple-use valve; In addition, in poppet valve core 6, have in the heart high-pressure induct through hole 25, utilize high-pressure induct bundle to affect main flow bundle, can effectively suppress cavitation erosion, reduce vibration and noise.
On the external surface of one way valve poppet valve core 6 and safe needle 15, be processed with respectively some micron order grooves that are evenly distributed, the groove of safe needle 15 external surfaces is cylindrical small pit, and the groove of one way valve poppet valve core 6 external surfaces is small groove; Small pit or groove can be used as micro-storage pool of lubrication oil or the nail collection slot of abrasive dust, for boundary lubrication provides lubricated or provides lubricated for the friction surface just starting, hold because the abrasive dust that boundary lubrication or dry friction produce, thereby reduce wear, increase the service life, make hydraulic pressure triple-use valve there is high-wearing feature and resistance tocrocking.
Fluid injection valve body 2 inlet 24 diameters are 6mm.
Valve base of safety valve 12 centre bore 31 diameters are 2mm.
Left valve cylinder 1 and right valve cylinder 23 adopt 40Cr as its material, and intensity can double.
The material of one-way valve seat 4, safe needle 15, valve base of safety valve 12, hexagonal fairlead 18 all adopts Cr-Ni series cast steel ZG0Cr18Ni9, and its surface is all coated with the engineering ceramics through thermal spraying treatment, can improve its cavitation resistive property.
Triple-use valve is the cardiac component of outside injection type hydraulic pillar; can control the feed liquor of hydraulic prop; its job stability directly affects the operation conditions of hydraulic prop; triple-use valve plays fluid injection effect in the time of setting prop; one way valve some work; raise and exceed rated operating pressure at a column pressure, safety valve some work, reaches the object of protecting pillar.The course of work of triple-use valve is exactly an actuation cycle of pillar, infusion gun is enclosed within on left valve cylinder 1, the highly pressurised liquid being come by pumping plant is entered in valve body 2 by left valve cylinder 1, in the time that working fluid pressure is greater than the pretightning force of one-way valve spring 7, one way valve poppet valve core 6 is pushed, valve port is opened, working solution enters right valve chamber by the spool bore 26 on one way valve poppet valve core 6, and enter in the valve body chamber between valve cylinder and connecting screw rod 10 by the interstitial hole 27 of connecting screw rod 10, and to enter by liquid outlet 29 the setting prop process that completes pillar in pillar chamber very be soon the effect of one way valve.Because hydraulic prop chamber also constantly increases along with working solution constantly enters its pressure, when hydraulic prop rises to top board, after bearing certain pressure, can be stabilized in certain altitude, now the pressure in valve body chamber also constantly increases, in the time that the pressure in valve pocket is greater than the pretightning force of safety valve spring 21, hydraulic coupling is by liquid outlet 29, the radial hole 28 at connecting screw rod 10 middle parts, axial hole 30 and valve base of safety valve centre bore 31, safe needle 15 will be pushed hexagonal fairlead 18 open, working solution just enters right valve cylinder 23, the liquid mouth 32 that unloads through valve body right-hand member is discharged valve body, realize the effect of safety valve---the safeguard protection of pillar.Cut off subsequently pumping plant power supply, no longer work in fluid injection chamber, one way valve poppet valve core 6 is got back to original position under the effect of one-way valve spring 7, liquid can not reflux, make pillar obtain a metastable pressure, in the process of this circulation poppet valve core 6 will with one-way valve seat 4, gland nut 5 and one-way valve spring 7 contact-impacts, wearing and tearing mutually, equally, safe needle 15 also can with valve base of safety valve 12, safe valve pad 16 and hexagonal fairlead 18 contact-impacts, simultaneously, in the course of the work, water lubrication is inadequate, and also can be to poppet valve core 6, safe needle 15 component such as grade of one-way valve seat 4 produce corrosion, the impurity of aqueous medium the inside also can produce wearing and tearing to these component.Design by be evenly distributed small pit or groove of the present utility model both can provide lubrication oil, also can be used as the nail collection slot of abrasive dust, for boundary lubrication provides lubricated or provides lubricated for the friction surface just starting, hold because the abrasive dust that boundary lubrication or dry friction produce, thereby reduce wear, increase the service life, make hydraulic pressure triple-use valve there is high-wearing feature and resistance tocrocking.
More than show and described general principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and manual, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (8)
1. a hydraulic prop hydraulic pressure triple-use valve, comprises left valve cylinder, right valve cylinder, one way valve part, safety valve part; Described one way valve part comprises poppet valve core, and described safety valve part comprises safe needle; It is characterized in that: on the external surface of described poppet valve core and safe needle, be processed with respectively some micron order grooves.
2. hydraulic prop hydraulic pressure triple-use valve according to claim 1, is characterized in that: described groove is evenly distributed.
3. according to hydraulic prop hydraulic pressure triple-use valve described in claim 1 or 2, it is characterized in that: described groove is small pit or groove.
4. hydraulic prop hydraulic pressure triple-use valve according to claim 3, is characterized in that: described small pit is cylindrical.
5. hydraulic prop hydraulic pressure triple-use valve according to claim 1, is characterized in that: described poppet valve core is two-step throttle structure.
6. according to hydraulic prop hydraulic pressure triple-use valve described in claim 1 or 5, it is characterized in that: on described poppet valve core, have through hole.
7. hydraulic prop hydraulic pressure triple-use valve according to claim 6, is characterized in that: described through hole is opened in poppet valve core in the heart.
8. hydraulic prop hydraulic pressure triple-use valve according to claim 1, is characterized in that: described one way valve part also comprises one-way valve seat, described safety valve part also comprises valve base of safety valve, hexagonal fairlead; The surface of described one-way valve seat, safe needle, valve base of safety valve, hexagonal fairlead is all coated with the engineering ceramics through thermal spraying treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320773345.1U CN203685229U (en) | 2013-11-28 | 2013-11-28 | Hydraulic three-way valve for single hydraulic prop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320773345.1U CN203685229U (en) | 2013-11-28 | 2013-11-28 | Hydraulic three-way valve for single hydraulic prop |
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| Publication Number | Publication Date |
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| CN203685229U true CN203685229U (en) | 2014-07-02 |
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| CN201320773345.1U Expired - Fee Related CN203685229U (en) | 2013-11-28 | 2013-11-28 | Hydraulic three-way valve for single hydraulic prop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615270A (en) * | 2013-11-28 | 2014-03-05 | 安徽理工大学 | Single hydraulic prop hydraulic pressure three-purpose valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615270A (en) * | 2013-11-28 | 2014-03-05 | 安徽理工大学 | Single hydraulic prop hydraulic pressure three-purpose valve |
| CN103615270B (en) * | 2013-11-28 | 2016-03-16 | 安徽理工大学 | A kind of single hydraulic prop hydraulic pressure three-purpose valve |
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