CN103244155B - A kind of hydraulic cylinder control valve impacting resonance without unloading - Google Patents
A kind of hydraulic cylinder control valve impacting resonance without unloading Download PDFInfo
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- CN103244155B CN103244155B CN201310192436.0A CN201310192436A CN103244155B CN 103244155 B CN103244155 B CN 103244155B CN 201310192436 A CN201310192436 A CN 201310192436A CN 103244155 B CN103244155 B CN 103244155B
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- 230000003116 impacting effect Effects 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 54
- 238000004891 communication Methods 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 238000000338 in vitro Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000282537 Mandrillus sphinx Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect 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
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
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Abstract
A kind of hydraulic cylinder control valve impacting resonance without unloading, overcome the unloading of existing hydraulic cylinder hydraulic control one-way valve and produce the problem of impacting resonance, feature is that in valve body, the first spool sealing valve port diameter is identical with diameter of sealed section and time liquid section diameter, control section diameter is less than back liquid section diameter, beneficial effect is, due to the first spool sealing valve port diameter and seal spool section diameter and spool, to return liquid section diameter identical, solve the unloading of hydraulic cylinder control valve and impact resonance problems, and sealing valve port diameter and diameter of sealed section and return liquid section diameter can be worth increase, control section diameter can reduce arbitrarily as required, its controlled pressure is made to be unlikely to too low, misoperation can not be produced, for setting prop is that the board-like connection one way valve of secondary orifices one way valve or the valve Ligation in vitro installed in secondary orifices in valve body or tubular type connect one way valve, meet and fall post major path, setting prop passage aisle, setting prop is simultaneously to balance jack and the needs lifting end jack joint control.
Description
Technical field
The invention belongs to technical field of hydraulic, particularly for a kind of hydraulic cylinder control valve impacting resonance without unloading of coal mine hydraulic supporting.
Background technology
As shown in Figure 1, in prior art, the column of coal mine hydraulic supporting, front-axle beam and tail boom hydraulic cylinder all use hydraulic control one-way valve 100 to control, and hydraulic shock resonance can be produced during hydraulic control one-way valve unloading, for column, during setting prop, the valve seat 102 that the nonreturn valve core 103 that highly pressurised liquid opens hydraulic control one-way valve leaves hydraulic control one-way valve enters column cavity of resorption, post alive is forced to raise, post upper end jacking hydraulic support top beam contact of living also firmly withstands top board, coal mine work area is kept to have a top board not inbreak, to maintain coal mining space.After coal mining, need hydraulic support advance a step pitch time, must post fall, the valve seat of hydraulic control one-way valve is left with the nonreturn valve core that the push rod 104 of hydraulic control one-way valve backs down hydraulic control one-way valve, known from experience by the high pressure liquid of fluid-control one-way valve seal and flow out from opening part high speed with the valve base chamber of hydraulic control one-way valve of the nonreturn valve core of hydraulic control one-way valve, spherical mandrill recoil, the nonreturn valve core of hydraulic control one-way valve can close with the valve seat of hydraulic control one-way valve, the high velocity stream that do not discharge is obstructed to the liquid of the sealing valve port of hydraulic control one-way valve, forms impact of water hammer.And the nonreturn valve core of hydraulic control one-way valve is continued repeatedly by the phenomenon that the valve seat that hydraulic control one-way valve is left on top is closed again, form resonance, peak swing can be 2 ~ 3 times before unloading, cause the element be communicated with by fluid-control one-way valve seal as safety valve overload failure, weld cracking, cylinder body overload is expanded.Suppress to produce the method for impacting with resonance amplitude by bar envelope although the first inventor of present patent application invented before 30 years, at present, whole world column controls also all to adopt the method, but condition is different, inhibition is not all satisfactory, also comparatively large with the amplitude of resonance in some local impact, even cause safety valve to destroy.
A kind of fluid-controlled cut-off valve is had in prior art, as shown in Figure 2, it is identical that the spool of the spool (202) of its fluid-controlled cut-off valve and the sealing valve port diameter (2F) of the valve seat (203) of fluid-controlled cut-off valve and the seal spool section diameter (2G) of its fluid-controlled cut-off valve and fluid-controlled cut-off valve returns liquid section diameter (2H), the hydraulic cylinder its principle referred to for coal mine hydraulic supporting controls to play the object of impacting resonance without unloading, but its complex structure, the swivel nut (204) installing fluid-controlled cut-off valve in valve body (201) left side of its fluid-controlled cut-off valve is threaded with the spring spool (209) of the spring (206) installing fluid-controlled cut-off valve, the spring force of its fluid-controlled cut-off valve can not adjust as required, the spool (202) of fluid-controlled cut-off valve is threaded with the spring base (205) of fluid-controlled cut-off valve, valve body (201) right side of fluid-controlled cut-off valve also has plug (207), valve seat holder (208) is had again at valve seat (205) place of fluid-controlled cut-off valve, there is the place that many places need sealing, especially time liquid section diameter (2H) that diameter is exactly the spool of fluid-controlled cut-off valve is controlled, passage aisle system can only be used, when for the control of coal mine hydraulic supporting major path major diameter system as column, the sealing valve port diameter (2F) of the spool (202) of fluid-controlled cut-off valve and the valve seat (203) of existing fluid-controlled cut-off valve, the seal spool section diameter (2G) of fluid-controlled cut-off valve and the spool of fluid-controlled cut-off valve return liquid section diameter (2H) needs equivalent increasing, controlled pressure must be caused significantly to reduce, easy generation is control by mistake, there is potential safety hazard.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides structure simple, a kind of hydraulic cylinder control valve impacting resonance without unloading that safety is high.
The technical solution used in the present invention comprises valve body, valve body main aperture is processed with in valve body, first spool of fluid-controlled cut-off valve effect has been installed in valve body main aperture, first valve seat, sleeve and seal, and in sleeve mounting spring seat, first spring and voltage regulation screw, first spool is installed in valve body main aperture, main aperture annular seal space is formed after sleeve and seal, main aperture back to the fluid chamber and control chamber, described first spool is apart from the diameter of sealed section of sealing valve port diameter same diameter with return outside liquid section diameter two sections of diameters, also has the control section diameter of small diameter, namely control section diameter is less than back liquid section diameter.
Valve body secondary orifices is also processed with in described valve body, second valve seat, the second spool, the second spring, stifled cover and seal are installed in valve body secondary orifices and form secondary orifices one way valve, and form secondary orifices annular seal space and secondary orifices admission chamber, the first ditch through hole and the second ditch through hole is also processed with in valve body, by the first ditch through hole, main aperture annular seal space and secondary orifices annular seal space are linked up, by the second ditch through hole, main aperture back to the fluid chamber and secondary orifices admission chamber are linked up.
Described valve body is also processed with and main aperture annular seal space, the 5th interface that secondary orifices annular seal space and the first ditch through hole are linked up, 6th interface and board-like connecting interface, described valve body is also processed with and main aperture back to the fluid chamber, the first interface that secondary orifices admission chamber and the second ditch through hole are linked up and the second interface, described valve body is also processed with the 3rd interface and the 4th interface of linking up with control chamber, described 5th interface and the 6th interface are for installing the element of linking up with column cavity of resorption, as pressure meter and pressure sensor, described first interface and the second interface are used for the connection with reversal valve and the valve of joint control simultaneously, described 3rd interface and the 4th interface are used for the connection with reversal valve and the valve of joint control simultaneously, described board-like connecting interface is used for the connection with column cavity of resorption.
Connect at described valve body external-board type and substitute the secondary orifices one way valve in valve body with the board-like one way valve that is connected that it communicates, there is board-like connection one way valve annular seal space and board-like connection one way valve admission chamber in the valve body of described board-like connection one way valve, replace the second valve seat, the second spool, the second spring, the secondary orifices annular seal space blocking up cover and seal formation and secondary orifices admission chamber are installed in valve body secondary orifices, described main aperture annular seal space is connected communication with board-like connection one way valve annular seal space by board-like, and described main aperture back to the fluid chamber is connected communication with board-like connection one way valve admission chamber by board-like.
Be connected one way valve in described valve body outer pipe type connection with the tubular type that it communicates and substitute the secondary orifices one way valve in valve body, in the valve body that described tubular type connects one way valve, there is tubular type one way valve annular seal space and tubular type one way valve admission chamber, replace, in valve body secondary orifices, the second valve seat is installed, second spool, second spring, the secondary orifices annular seal space that stifled cover and seal are formed and secondary orifices admission chamber, described main aperture annular seal space is connected one way valve annular seal space and connects communication by tubular type with tubular type, the interface that one way valve is plugged into main aperture annular seal space is connected by tubular type, link up tubular type and connect one way valve annular seal space and main aperture annular seal space, described main aperture back to the fluid chamber is connected one way valve admission chamber and installs a threeway and one section of communicating pipe communication by connecting in tubular type on one way valve with tubular type, namely the threeway being plugged into tubular type connecting one way valve admission chamber by, one section of interface being connected to main aperture back to the fluid chamber communicating pipe, connect tubular type and connect one way valve admission chamber and main aperture back to the fluid chamber.
Compared with prior art, the invention has the beneficial effects as follows:
(1) due to sealing valve port diameter and the seal spool section diameter and spool of the present invention first spool, to return liquid section diameter identical, solve fluid cylinder unloading and impact resonance problems, no matter how high main aperture sealing cavity pressure is, its control chamber makes its Compress Spring that moves to left by hydraulic control, spool is lifted off a seat, annular seal space inner high voltage liquid flows out to back to the fluid chamber, seal cavity pressure identical with the amount of force of seal spool section diameter to the sealing valve port diameter that diameter is identical this moment, direction is contrary, in back to the fluid chamber, pressure is identical with the amount of force that spool returns liquid section diameter to the sealing valve port diameter that diameter is identical this moment, direction is contrary, so spool is only by liquid controling cavity active force and spring-force driven dual, can not close, impact of water hammer can not be produced.
(2) for meeting major path valve needs, the sealing valve port diameter of the present invention first spool, diameter of sealed section and return liquid section diameter can be worth increase, control section diameter can reduce arbitrarily as required, makes its controlled pressure be unlikely to too low, can not produce misoperation.
(3) for the control of column, need to fall post fast, need major path valve, need the first spool sealing valve port diameter, diameter of sealed section and time liquid section diameter are arbitrarily with being worth increase, and the present invention impacts the hydraulic cylinder control valve of resonance without unloading, for setting prop is that the board-like connection one way valve of secondary orifices one way valve in valve body or valve Ligation in vitro or the tubular type of valve Ligation in vitro connect one way valve, its feed liquor is 2 passages with returning liquid, meet setting prop passage aisle, the needs of post major path fall, its valve port littlely can meet again setting prop simultaneously to balance jack to not affecting setting prop speed, lift the coordinated signals of base jack, and prior art setting prop with post falls by the same passage of hydraulic control one-way valve, setting prop passage aisle can not be met, fall the needs of post major path.
Accompanying drawing explanation
Fig. 1 is hydraulic control one-way valve sectional drawing,
Fig. 2 is existing fluid-controlled cut-off valve sectional drawing,
Fig. 3 is the principal section figure of the specific embodiment of the invention 1,
Fig. 4 is the Q-Q sectional drawing of Fig. 3,
Fig. 5 is the P-P sectional drawing of Fig. 3,
Fig. 6 is the principal section figure of the specific embodiment of the invention 2,
Fig. 7 is the principal section figure of the specific embodiment of the invention 3.
In figure:
100-hydraulic control one-way valve, the valve body of 101-hydraulic control one-way valve,
The valve seat of 102-hydraulic control one-way valve, the nonreturn valve core of 103-hydraulic control one-way valve,
The push rod of 104-hydraulic control one-way valve,
The valve body of 201-fluid-controlled cut-off valve, the spool of 202-fluid-controlled cut-off valve,
The valve seat of 203-fluid-controlled cut-off valve, the swivel nut of 204-fluid-controlled cut-off valve,
The spring base of 205-fluid-controlled cut-off valve, the spring of 206-fluid-controlled cut-off valve,
207-plug, the holder of 208-valve seat, 209-spring spool,
2A-fluid-controlled cut-off valve enter back liquid interface,
The control interface of 2B-fluid-controlled cut-off valve,
The annular seal space interface of 2C-fluid-controlled cut-off valve
1-valve body, 2-first spool,
3-first valve seat, 4-sleeve,
5-spring base, 6-first spring,
7-voltage regulation screw, 8-second valve seat,
9-second spool, 10-second spring,
The stifled cover of 11-, 12-screw hole,
13-valve body main aperture, 14-valve body secondary orifices,
15-first ditch through hole, 16-second ditch through hole,
17-secondary orifices one way valve,
A-first interface, A1-second interface,
B-the 3rd interface, B1-the 4th interface,
C-the 5th interface, C1-the 6th interface,
The board-like connecting interface of E-,
F-sealing valve port diameter, G-diameter of sealed section,
H-returns liquid section diameter, S-control section diameter,
M-main aperture annular seal space, M1-secondary orifices annular seal space, M2-one way valve annular seal space,
N-main aperture back to the fluid chamber, N1-secondary orifices admission chamber, N2-one way valve admission chamber,
K-control chamber,
The board-like connection one way valve of 601-,
6M2-board-like connection one way valve annular seal space,
6N2-board-like connection one way valve admission chamber,
701-tubular type connects one way valve,
702-threeway, 703-communicating pipe,
7M2-tubular type connects one way valve annular seal space,
7n2-tubular type connects one way valve admission chamber.
Detailed description of the invention
The specific embodiment of the present invention is provided below in conjunction with accompanying drawing.
Detailed description of the invention 1
As shown in Fig. 3 ~ Fig. 5, the technical solution used in the present invention comprises valve body 1, valve body main aperture 13 is processed with in valve body 1, valve body secondary orifices 14, first ditch through hole 15 and the second ditch through hole 16, first valve seat 3 of fluid-controlled cut-off valve effect has been installed in described valve body main aperture 13, first spool 2, sleeve 4 and seal, and in sleeve 4 mounting spring seat 5, first spring 6 and voltage regulation screw 7, in valve body main aperture 13, first spool 2 is installed, main aperture annular seal space M is formed after sleeve 4 and seal, main aperture back to the fluid chamber N and control chamber K, described first spool 2 is apart from the diameter of sealed section G of sealing valve port diameter F same diameter with return outside liquid section diameter H two sections of diameters, also has the control section diameter S of small diameter, the sealing valve port diameter F of the first spool 2 is identical with time liquid section diameter H of the diameter of sealed section G of the first spool 2 and the first spool 2, control section diameter S is less than back liquid section diameter H, in valve body secondary orifices 14, second valve seat 8 is installed, second spool 9, second spring 10, stifled cover 11 and seal form secondary orifices one way valve 17, and form secondary orifices annular seal space M1 and secondary orifices admission chamber N1, valve body 1 is provided with first interface A, second interface A1, 3rd interface B, 4th interface B1, 5th interface C, 6th interface C1 and board-like connecting interface E, by the first ditch through hole 15, main aperture annular seal space M and secondary orifices annular seal space M1 is linked up, and lead to board-like connecting interface E, and link up with the 5th interface C and the 6th interface C1, by the second ditch through hole 16, main aperture back to the fluid chamber N and secondary orifices admission chamber N1 is linked up, and link up with first interface A and the second interface A1.
During use, first interface A is connected with reversal valve by sebific duct with the 3rd interface B, and board-like connecting interface E is connected with column cavity of resorption, and valve body 1 is also provided with 4 screw holes 12 for installing attachment screw during board-like connection, after first interface A accepts highly pressurised liquid from reversal valve, highly pressurised liquid enters main aperture back to the fluid chamber N through the second ditch through hole 16, before secondary orifices admission chamber N1 to the second spool 9, open the second spool 9 and leave the second valve seat 8, enter secondary orifices annular seal space M1, through the first ditch through hole 15, again through main aperture annular seal space M, board-like connector E is to column cavity of resorption, when stopping from reversal valve to first interface A feed flow, closed by the second spool 9 of backing down and the second valve seat 8, airtight secondary orifices annular seal space M1, first spool 2 of hydro-cushion this moment makes the first spool 2 and the first valve seat 3 seal by the first spring 6, airtight main aperture annular seal space M, also just airtight column cavity of resorption, when the 3rd interface B accepts highly pressurised liquid from reversal valve, highly pressurised liquid enters main aperture control chamber K, when hydraulic coupling is more than the first spring 6 power, first spool 2 moves to left, and column cavity of resorption highly pressurised liquid is through board-like connector E, flow to main aperture back to the fluid chamber N through the opened gap of the first ditch through hole 15, main aperture annular seal space M, the first spool 2 and the first valve seat 3, return liquid through the sebific duct between first interface A and reversal valve, reversal valve again, because the first spool 2 is identical with time liquid section diameter H of the sealing valve port diameter F of the first valve seat 3 and diameter of sealed section G of the first spool 2 and the first spool 2, so, above-mentionedly can not produce unloading hydraulic shock resonance by column cavity of resorption through the whole pressure leak process of board-like interface E, main aperture annular seal space M to main aperture back to the fluid chamber N.
Detailed description of the invention 2
As shown in Figure 6, the technical scheme that the specific embodiment of the invention 2 adopts is identical with detailed description of the invention 1, difference is to connect at described valve body 1 external-board type to substitute the secondary orifices one way valve 17 in valve body 1 with the board-like one way valve 601 that is connected that it communicates, there is board-like connection one way valve annular seal space 6M2 and board-like connection one way valve admission chamber 6N2 in the valve body of board-like connection one way valve 601, described main aperture annular seal space M and board-like connection one way valve annular seal space 6M2 linked up when board-like connection, and lead to board-like connecting interface E, and link up with the 5th interface C and the 6th interface C1, described main aperture back to the fluid chamber N and board-like connection one way valve admission chamber 6N2 linked up when board-like connection, and link up with first interface A and the second interface A1.
Detailed description of the invention 3
As shown in Figure 7, the technical scheme that the specific embodiment of the invention 3 adopts is identical with detailed description of the invention 1, difference is that being connected one way valve 701 in described valve body 1 outer pipe type connection with the tubular type that it communicates substitutes the secondary orifices one way valve 17 in valve body 1, in the valve body that tubular type connects one way valve 701, there is tubular type connection one way valve annular seal space 7M2 and be connected one way valve admission chamber 7N2 with tubular type, described main aperture annular seal space M is connected one way valve annular seal space 7M2 and links up when tubular type connects with tubular type, and with board-like connecting interface E, 5th interface C and the 6th interface C1 links up, described first interface A, second interface A1, main aperture back to the fluid chamber N is connected one way valve admission chamber 7N2 by installing a threeway 702 and link up one period of communicating pipe 703 on tubular type connection one way valve 701 with tubular type.
Detailed description of the invention 4
On the basis of detailed description of the invention 1,2 or 3, valve pair can be made into hard seal valve pair or cone valve secondary ball valve pair or flat valve secondary.
Claims (4)
1. one kind is impacted the hydraulic cylinder control valve of resonance without unloading, comprise valve body (1), it is characterized in that, valve body main aperture (13) is processed with in valve body (1), first spool (2) of fluid-controlled cut-off valve effect has been installed in valve body main aperture (13), first valve seat (3), sleeve (4) and seal, and in sleeve (4) mounting spring seat (5), first spring (6) and voltage regulation screw (7), in valve body main aperture (13), the first spool (2) is installed, main aperture annular seal space (M) is formed after sleeve (4) and seal, main aperture back to the fluid chamber (N) and control chamber (K), described first spool (2) is apart from the diameter of sealed section (G) of sealing valve port diameter (F) same diameter with return outside liquid section diameter (H) two sections of diameters, also has the control section diameter (S) of small diameter, valve body secondary orifices (14) is also processed with in described valve body (1), in valve body secondary orifices (14), the second valve seat (8) is installed, second spool (9), second spring (10), stifled cover (11) and seal form secondary orifices one way valve (17), and form secondary orifices annular seal space (M1) and secondary orifices admission chamber (N1), the first ditch through hole (15) and the second ditch through hole (16) is also processed with in valve body (1), by the first ditch through hole (15), main aperture annular seal space (M) and secondary orifices annular seal space (M1) are linked up, by the second ditch through hole (16), main aperture back to the fluid chamber (N) and secondary orifices admission chamber (N1) are linked up.
2. a kind of without unloading the hydraulic cylinder control valve impacting resonance according to claim 1, it is characterized in that, described valve body (1) is also processed with and main aperture annular seal space (M), the 5th interface (C) that secondary orifices annular seal space (M1) and the first ditch through hole (15) are linked up, 6th interface (C1) and board-like connecting interface (E), described valve body (1) is also processed with and main aperture back to the fluid chamber (N), the first interface (A) that secondary orifices admission chamber (N1) and the second ditch through hole (16) are linked up and the second interface (A1), described valve body (1) is also processed with the 3rd interface (B) and the 4th interface (B1) of linking up with control chamber (K).
3. a kind of without unloading the hydraulic cylinder control valve impacting resonance according to claim 1, it is characterized in that, connect at described valve body (1) external-board type communicate with it board-like and be connected one way valve (601), described main aperture annular seal space (M) is connected communication with board-like connection one way valve annular seal space (6M2) by board-like, and described main aperture back to the fluid chamber (N) is connected communication with board-like connection one way valve admission chamber (6N2) by board-like.
4. a kind of without unloading the hydraulic cylinder control valve impacting resonance according to claim 1, it is characterized in that, connect at described valve body (1) outer pipe type and be connected one way valve (701) with the tubular type that it communicates, described main aperture annular seal space (M) is connected one way valve annular seal space (7M2) and connects communication by tubular type with tubular type, described main aperture back to the fluid chamber (N) is connected one way valve admission chamber (7N2), and by connecting one way valve (701) in tubular type, above installation threeway (702) and one section of communicating pipe (703) are linked up with tubular type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310192436.0A CN103244155B (en) | 2013-05-23 | 2013-05-23 | A kind of hydraulic cylinder control valve impacting resonance without unloading |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310192436.0A CN103244155B (en) | 2013-05-23 | 2013-05-23 | A kind of hydraulic cylinder control valve impacting resonance without unloading |
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| CN103244155A CN103244155A (en) | 2013-08-14 |
| CN103244155B true CN103244155B (en) | 2015-07-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111473023B (en) * | 2020-04-22 | 2022-05-13 | 中国飞机强度研究所 | Intelligent monitoring system and positioning method for resonance of hydraulic cylinder |
| CN113090296B (en) * | 2021-05-14 | 2022-02-08 | ***高科液压股份有限公司 | Large-drift-diameter hydraulic control one-way valve |
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| CN2262099Y (en) * | 1996-02-12 | 1997-09-10 | 清华大学金属工艺学教研室 | Top Contact type moving frame valve |
| CN2656761Y (en) * | 2003-11-21 | 2004-11-17 | 中国石化集团胜利石油管理局钻井工艺研究院 | Double controlled constant pressure difference pressure-regulating valve |
| CN201281050Y (en) * | 2008-09-28 | 2009-07-29 | 哈尔滨工业大学 | Novel emergency protection arrangement for three-stage electrohydraulic servo valve |
| CN102654149A (en) * | 2012-05-18 | 2012-09-05 | 常德中联重科液压有限公司 | Hydraulic control valve |
| CN203321549U (en) * | 2013-05-23 | 2013-12-04 | 北京天地玛珂电液控制***有限公司 | Hydraulic cylinder control valve without unloading impact resonance |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10112496B4 (en) * | 2001-03-15 | 2004-09-30 | Dbt Gmbh | Valve block for electrohydraulic control device and reusable valves therefor |
| DE20307512U1 (en) * | 2003-05-13 | 2003-07-10 | DBT GmbH, 44534 Lünen | Hydraulically switchable directional valve |
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2013
- 2013-05-23 CN CN201310192436.0A patent/CN103244155B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2262099Y (en) * | 1996-02-12 | 1997-09-10 | 清华大学金属工艺学教研室 | Top Contact type moving frame valve |
| CN2656761Y (en) * | 2003-11-21 | 2004-11-17 | 中国石化集团胜利石油管理局钻井工艺研究院 | Double controlled constant pressure difference pressure-regulating valve |
| CN201281050Y (en) * | 2008-09-28 | 2009-07-29 | 哈尔滨工业大学 | Novel emergency protection arrangement for three-stage electrohydraulic servo valve |
| CN102654149A (en) * | 2012-05-18 | 2012-09-05 | 常德中联重科液压有限公司 | Hydraulic control valve |
| CN203321549U (en) * | 2013-05-23 | 2013-12-04 | 北京天地玛珂电液控制***有限公司 | Hydraulic cylinder control valve without unloading impact resonance |
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| CN103244155A (en) | 2013-08-14 |
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Address after: 100013, Beijing, Chaoyang District, Hepingli Youth ditch East Road, building 5, one floor Patentee after: CCTEG Beijing Tianma Intelligent Control Technology Co.,Ltd. Address before: 100013, Beijing, Chaoyang District, Hepingli Youth ditch East Road, building 5, one floor Patentee before: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. |