CN103244155A - Hydraulic cylinder control valve without unloading impact resonance - Google Patents
Hydraulic cylinder control valve without unloading impact resonance Download PDFInfo
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- CN103244155A CN103244155A CN2013101924360A CN201310192436A CN103244155A CN 103244155 A CN103244155 A CN 103244155A CN 2013101924360 A CN2013101924360 A CN 2013101924360A CN 201310192436 A CN201310192436 A CN 201310192436A CN 103244155 A CN103244155 A CN 103244155A
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- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims description 32
- 238000004891 communication Methods 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 6
- 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
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Abstract
The invention discloses a hydraulic cylinder control valve without unloading impact resonance, which overcomes the problem that impact resonance is generated by the unloading of a hydraulic control one-way valve of a conventional hydraulic cylinder. The hydraulic cylinder control valve without unloading impact resonance is characterized in that: a sealing diameter of a valve opening of a first valve core inside a valve body is same as a diameter of a sealing section and a diameter of a liquid return section; and the diameter of a control section is smaller than the diameter of a liquid return section. The beneficial effects are that: as the sealing diameter of the valve opening of a first valve core is same as the diameter of the sealing section and the diameter of the liquid return section, the unloading impact resonance problem of the control valve of the hydraulic cylinder is solved; as the sealing diameter of the valve opening, the diameter of the sealing section and the diameter of the liquid return section can be increased equivalently, and the diameter of the control section can be reduced at will based on a need, the control pressure is unlikely too low, and no false operation is generated; and a secondary-hole one-way valve arranged in a secondary hole inside the valve body or a plate-shaped connecting one-way valve or a tubular one-way valve outside the valve body are used for raising a column, so that needs of big channel for dropping the column, a small channel for raising the column, and joint control of a balancing jack and a lifting jack while the column is raised are satisfied.
Description
Technical field
The invention belongs to technical field of hydraulic, particularly control valve for a kind of hydraulic cylinder that does not have unloading impact resonance of coal mine hydraulic supporting.
Background technology
As shown in Figure 1, in the prior art, the column of coal mine hydraulic supporting, front-axle beam and tail boom hydraulic cylinder are all used hydraulic control one-way valve 100 controls, and the hydraulic control one-way valve unloading time can produce hydraulic shock resonance, be example with the column, during setting prop, the valve seat 102 that the nonreturn valve core 103 that highly pressurised liquid is opened hydraulic control one-way valve leaves hydraulic control one-way valve enters the column cavity of resorption, force post alive to raise, top board is also firmly withstood in the post upper end jacking hydraulic support back timber contact of living, keep coal mine work area that a not inbreak of top board is arranged, to keep the coal mining space.After mining, when needing hydraulic support to advance a step pitch, post must fall, the nonreturn valve core that backs down hydraulic control one-way valve with the push rod 104 of hydraulic control one-way valve leaves the valve seat of hydraulic control one-way valve, known from experience from the opening part of the valve base chamber of the nonreturn valve core of hydraulic control one-way valve and hydraulic control one-way valve by the high pressure liquid of fluid-control one-way valve seal and to flow out at a high speed, punching press push rod recoil, the nonreturn valve core of hydraulic control one-way valve can with the valve seat closure of hydraulic control one-way valve, the high velocity stream that discharges 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 left the phenomenon that the valve seat of hydraulic control one-way valve closes again by the top and continues repeatedly, form resonance, peak swing can be 2～3 times before the unloading, cause and the element that is communicated with by the fluid-control one-way valve seal such as safety valve overload failure, weld cracking, cylinder body overload expansion etc.Though inventing with the bar envelope, first inventor of present patent application suppresses to produce the method for impacting with the resonance amplitude before 30 years, at present, the method is also all adopted in whole world column control, but condition difference, inhibition is not all satisfactory, also bigger with the amplitude of resonance in some local impact, even cause safety valve to destroy.
A kind of fluid-controlled cut-off valve is arranged in the prior art, as shown in Figure 2, it is identical that the spool of the sealing valve port diameter (2F) of the spool of its fluid-controlled cut-off valve (202) and 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), its principle is referred to the purpose that can play nothing unloading impact resonance for the hydraulic cylinder control of coal mine hydraulic supporting, but its complex structure, the swivel nut (204) that fluid-controlled cut-off valve is installed in valve body (201) left side of its fluid-controlled cut-off valve is threaded with the spring spool (209) of the spring (206) that fluid-controlled cut-off valve is installed, the spring force of its fluid-controlled cut-off valve can not be adjusted as required, the spool of fluid-controlled cut-off valve (202) is threaded with the spring base (205) of fluid-controlled cut-off valve, the valve body of fluid-controlled cut-off valve (201) right side also has plug (207), locate and valve seat holder (208) arranged at the valve seat (205) of fluid-controlled cut-off valve, the place that exists many places to seal, especially controlling diameter is exactly time liquid section diameter (2H) of the spool of fluid-controlled cut-off valve, can only use the passage aisle system, when being used for the control of coal mine hydraulic supporting major path major diameter system such as column, the sealing valve port diameter (2F) of the valve seat (203) of the spool of fluid-controlled cut-off valve (202) and 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 the increasing, must cause controlled pressure to reduce significantly, be easy to generate the mistake control, have potential safety hazard.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, provides simple in structure, safe a kind of hydraulic cylinder control valve that resonance is impacted in unloading that do not have.
The technical solution used in the present invention comprises valve body, in valve body, be processed with the valve body main aperture, first spool of fluid-controlled cut-off valve effect has been installed in the valve body main aperture, first valve seat, sleeve and seal, and in sleeve the mounting spring seat, first spring and voltage regulation screw, first spool is installed in the valve body main aperture, form the main aperture annular seal space behind sleeve and the seal, main aperture returns sap cavity and control chamber, described first spool is except having with the seal section diameter of sealing valve port diameter same diameter and returning two sections diameters of liquid section diameter, also have the control section diameter than minor diameter, namely the control section diameter is less than returning liquid section diameter.
In described valve body, also be processed with the secondary hole of valve body, second valve seat, second spool, second spring, stifled cover and seal are installed in the secondary hole of valve body are constituted secondary hole one way valve, and form secondary hole annular seal space and secondary hole admission chamber, in valve body, also be processed with the first ditch through hole and the second ditch through hole, by the first ditch through hole main aperture annular seal space and secondary hole annular seal space are linked up, by the second ditch through hole main aperture is returned sap cavity and the communication of secondary hole admission chamber.
On described valve body, also be processed with and the main aperture annular seal space, the 5th interface that secondary hole annular seal space and the first ditch through hole are linked up, the 6th interface and board-like connecting interface, on described valve body, also be processed with main aperture and return sap cavity, first interface and second interface that secondary hole admission chamber and the second ditch through hole are linked up, on described valve body, also be processed with the 3rd interface and the 4th interface of linking up with control chamber, described the 5th interface and the 6th interface are used for installing the element of linking up with the column cavity of resorption, as pressure meter and pressure sensor, described first interface and second interface are used for and reversal valve and being connected of valve of joint control simultaneously, described the 3rd interface and the 4th interface are used for and reversal valve and being connected of valve of joint control simultaneously, and described board-like connecting interface is used for and being connected of column cavity of resorption.
Board-like connection substitutes secondary hole one way valve in valve body with the board-like one way valve that is connected that it communicates outside described valve body, in the valve body of described board-like connection one way valve, have board-like connection one way valve annular seal space and the board-like one way valve admission chamber that is connected, secondary hole annular seal space and the secondary hole admission chamber that second valve seat, second spool, second spring, stifled cover and seal form installed in replacement in the secondary hole of valve body, described main aperture annular seal space is linked up by board-like connection with the board-like one way valve annular seal space that is connected, and described main aperture returns sap cavity and linked up by board-like connection with the board-like one way valve admission chamber that is connected.
The tubular type that tubular type connects with it communicates outside described valve body is connected one way valve and substitutes secondary hole one way valve in valve body, in the valve body of described tubular type connection one way valve, have tubular type one way valve annular seal space and tubular type one way valve admission chamber, replacement is installed second valve seat in the secondary hole of valve body, second spool, second spring, secondary hole annular seal space and secondary hole admission chamber that stifled cover and seal form, described main aperture annular seal space is connected the one way valve annular seal space and connects communication by tubular type with tubular type, be about to tubular type and connect the interface that one way valve is plugged into the main aperture annular seal space, link up tubular type and connected one way valve annular seal space and main aperture annular seal space, described main aperture returns sap cavity and is connected the one way valve admission chamber with tubular type by connect threeway of one way valve installation and one section communicating pipe communication in tubular type, namely be plugged into the threeway that tubular type connects the one way valve admission chamber by one, one section is connected to the interface that main aperture returns sap cavity communicating pipe, has connected tubular type connection one way valve admission chamber and main aperture and has returned sap cavity.
Compared with prior art, the invention has the beneficial effects as follows:
(1) since the sealing valve port diameter of the present invention's first spool and seal spool section diameter and spool to return liquid section diameter identical, solve the fluid cylinder unloading and impacted resonance problems, no matter how high main aperture annular seal space internal pressure is, its control chamber is subjected to hydraulic control to make its compression spring that moves to left, spool is lifted off a seat, annular seal space inner high voltage liquid flows out to back sap cavity, the annular seal space internal pressure is identical with the amount of force of seal spool section diameter to the identical sealing valve port diameter of diameter this moment, direction is opposite, to return the sap cavity internal pressure identical with the amount of force that spool returns liquid section diameter to the identical sealing valve port diameter of diameter this moment, direction is opposite, so spool only is subjected to liquid controling cavity active force and spring force effect, can not close, can not produce impact of water hammer.
(2) for satisfying major path valve needs, the sealing valve port diameter of the present invention's first spool, seal section diameter and time liquid section diameter can increase with value, and the control section diameter can dwindle arbitrarily as required, makes its controlled pressure be unlikely to too low, can not produce misoperation.
(3) for the control of column, it is fast to fall post, need the major path valve, need the first spool sealing valve port diameter, seal section diameter and time liquid section diameter increase with value arbitrarily, and the present invention does not have the hydraulic cylinder control valve that resonance is impacted in unloading, what be used for setting prop is secondary hole one way valve in valve body or the tubular type connection one way valve of the outer board-like connection one way valve that connects of valve body or the outer connection of valve body, its feed liquor is 2 passages with returning liquid, satisfy the setting prop passage aisle, fall the needs of post major path, its valve port can satisfy setting prop again simultaneously to balance jack to not influencing setting prop speed for a short time, lift the interlock control of base jack; And the prior art setting prop with post falls by the same passage of hydraulic control one-way valve, can not satisfy the setting prop passage aisle, the needs of post major path fall.
Description of drawings
Fig. 1 is the 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.
Among the figure:
The 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,
The 207-plug, the holder of 208-valve seat, the 209-spring spool,
The 2A-fluid-controlled cut-off valve advance 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
The 1-valve body, 2-first spool,
3-first valve seat, the 4-sleeve,
The 5-spring base, 6-first spring,
The 7-voltage regulation screw, 8-second valve seat,
9-second spool, 10-second spring,
The stifled cover of 11-, the 12-screw hole,
13-valve body main aperture, the secondary hole of 14-valve body,
The 15-first ditch through hole, the 16-second ditch through hole,
The secondary hole of 17-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-seal section diameter,
H-returns liquid section diameter, S-control section diameter,
M-main aperture annular seal space, the secondary hole of M1-annular seal space, M2-one way valve annular seal space,
The N-main aperture returns sap cavity, the secondary hole of N1-admission chamber, and N2-one way valve admission chamber,
The K-control chamber,
The board-like connection one way valve of 601-,
The board-like connection one way valve of 6M2-annular seal space,
The board-like connection one way valve of 6N2-admission chamber,
The 701-tubular type connects one way valve,
The 702-threeway, 703-communicating pipe,
The 7M2-tubular type connects the one way valve annular seal space,
7The N2-tubular type connects the one way valve admission chamber.
The specific embodiment
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing.
The specific embodiment 1
As Fig. 3～shown in Figure 5, the technical solution used in the present invention comprises valve body 1, in valve body 1, be processed with valve body main aperture 13, the secondary hole 14 of valve body, the 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, first spool 2 is installed in valve body main aperture 13, form main aperture annular seal space M behind sleeve 4 and the seal, main aperture returns sap cavity N and control chamber K, described first spool 2 is except having with the seal section diameter G of sealing valve port diameter F same diameter and returning two sections diameters of liquid section diameter H, also has the control section diameter S than minor diameter, the sealing valve port diameter F of first spool 2 is identical with time liquid section diameter H of the seal section diameter G of first spool 2 and first spool 2, control section diameter S is less than returning liquid section diameter H, in the secondary hole 14 of valve body, second valve seat 8 is installed, second spool 9, second spring 10, stifled cover 11 and seal constitute secondary hole one way valve 17, and form secondary hole annular seal space M1 and secondary hole admission chamber N1, be provided with the first interface A at valve body 1, the second interface A1, the 3rd interface B, the 4th interface B1, the 5th interface C, the 6th interface C1 and board-like connecting interface E, by the first ditch through hole 15 main aperture annular seal space M and secondary hole annular seal space M1 are linked up, and towards 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 is returned sap cavity N and secondary hole admission chamber N1 communication, and link up with the first interface A and the second interface A1.
During use, the 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 the column cavity of resorption, and 4 screw holes 12 of attachment screw are installed when also being provided with for board-like the connection on valve body 1; After the first interface A accepts highly pressurised liquid from reversal valve, highly pressurised liquid enters main aperture through the second ditch through hole 16 and returns sap cavity N, secondary hole admission chamber N1 is before second spool 9, open second spool 9 and leave second valve seat 8, enter secondary hole 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 the column cavity of resorption, when stopping from reversal valve to the first interface A feed flow, second spool 9 and second valve seat, 8 closures backed down, airtight secondary hole annular seal space M1, first spool 2 of hydro-cushion this moment seals first spool 2 and first valve seat 3 by first spring 6, and airtight main aperture annular seal space M is also with regard to 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 surpasses first spring, 6 power, first spool 2 moves to left, and column cavity of resorption highly pressurised liquid flows to through board-like connector E, through the opened gap of the first ditch through hole 15, main aperture annular seal space M, first spool 2 and first valve seat 3 that main aperture returns sap cavity N, sebific duct, the reversal valve through between the first interface A and reversal valve returns liquid again; Because time liquid section diameter H of the sealing valve port diameter F of first spool 2 and first valve seat 3 and the seal section diameter G of first spool 2 and first spool 2 is identical, so the above-mentioned whole pressure leak process that returns sap cavity N through board-like interface E, main aperture annular seal space M to main aperture by the column cavity of resorption can not produce unloading hydraulic shock resonance.
The specific embodiment 2
As shown in Figure 6, the technical scheme that the specific embodiment of the invention 2 adopts is identical with the specific embodiment 1, difference is that outside described valve body 1 board-like connection and its communicate, and the board-like one way valve 601 that is connected substitutes secondary hole one way valve 17 in valve body 1, in the valve body of board-like connection one way valve 601, have board-like connection one way valve annular seal space 6M2 and the board-like one way valve admission chamber 6N2 that is connected, described main aperture annular seal space M links up when the board-like connection with the board-like one way valve annular seal space 6M2 that is connected, and towards board-like connecting interface E, and link up with the 5th interface C and the 6th interface C1, described main aperture returns sap cavity N and links up when the board-like connection with the board-like one way valve admission chamber 6N2 that is connected, and links up with the first interface A and the second interface A1.
The specific embodiment 3
As shown in Figure 7, the technical scheme that the specific embodiment of the invention 3 adopts is identical with the specific embodiment 1, difference is that the connection of described valve body 1 outside tubular type is connected one way valve 701 and substitutes secondary hole one way valve 17 in valve body 1 with the tubular type that it communicates, in tubular type connects the valve body of one way valve 701, have 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, the 5th interface C and the 6th interface C1 link up, the described first interface A, the second interface A1, main aperture returns sap cavity N and is connected one way valve admission chamber 7N2 with tubular type by connect one way valve threeway 702 of 701 installations and one section communicating pipes 703 communication in tubular type.
The specific embodiment 4
On the specific embodiment 1,2 or 3 basis, the valve pair can be made into the secondary ball valve pair of hard seal valve pair or cone valve or plane valve pair.
Claims (5)
1. one kind is not had the hydraulic cylinder control valve that resonance is impacted in unloading, comprise valve body (1), it is characterized in that, in valve body (1), be processed with valve body main aperture (13), 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), first spool (2) is installed in valve body main aperture (13), form main aperture annular seal space (M) behind sleeve (4) and the seal, main aperture returns sap cavity (N) and control chamber (K), described first spool (2) also has the control section diameter (S) than minor diameter except having with the seal section diameter (G) of sealing valve port diameter (F) same diameter and returning two sections diameters of liquid section diameter (H).
2. according to the described a kind of hydraulic cylinder control valve that resonance is impacted in unloading that do not have of claim 1, it is characterized in that, in described valve body (1), also be processed with the secondary hole (14) of valve body, second valve seat (8) is installed in the secondary hole of valve body (14), second spool (9), second spring (10), stifled cover (11) and seal constitute secondary hole one way valve (17), and form secondary hole annular seal space (M1) and secondary hole admission chamber (N1), in valve body (1), also be processed with the first ditch through hole (15) and the second ditch through hole (16), by the first ditch through hole (15) main aperture annular seal space (M) and secondary hole annular seal space (M1) are linked up, by the second ditch through hole (16) main aperture is returned sap cavity (N) and secondary hole admission chamber (N1) communication.
3. according to the described a kind of hydraulic cylinder control valve that resonance is impacted in unloading that do not have of claim 1, it is characterized in that, on described valve body (1), also be processed with and main aperture annular seal space (M), the 5th interface (C) that secondary hole annular seal space (M1) and the first ditch through hole (15) are linked up, the 6th interface (C1) and board-like connecting interface (E), on described valve body (1), also be processed with main aperture and return sap cavity (N), first interface (A) and second interface (A1) that secondary hole admission chamber (N1) and the second ditch through hole (16) are linked up also are processed with the 3rd interface (B) and the 4th interface (B1) of linking up with control chamber (K) on described valve body (1).
4. according to the described a kind of hydraulic cylinder control valve that resonance is impacted in unloading that do not have of claim 1, it is characterized in that, board-like connection and its board-like one way valve (601) that is connected that communicates outside described valve body (1), described main aperture annular seal space (M) is linked up by board-like connection with the board-like one way valve annular seal space (6M2) that is connected, and described main aperture returns sap cavity (N) and linked up by board-like connection with the board-like one way valve admission chamber (6N2) that is connected.
5. according to the described a kind of hydraulic cylinder control valve that resonance is impacted in unloading that do not have of claim 1, it is characterized in that, the tubular type that tubular type connects with it communicates outside described valve body (1) is connected one way valve (701), 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 returns sap cavity (N) and is connected one way valve admission chamber (7N2) with tubular type by linking up in tubular type connection one way valve (a 701) installation threeway (702) and one period communicating pipe (703).
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| 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 true CN103244155A (en) | 2013-08-14 |
| CN103244155B CN103244155B (en) | 2015-07-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473023A (en) * | 2020-04-22 | 2020-07-31 | 中国飞机强度研究所 | Intelligent monitoring system and positioning method for resonance of hydraulic cylinder |
| CN113090296A (en) * | 2021-05-14 | 2021-07-09 | 丰隆高科液压股份有限公司 | Large-drift-diameter hydraulic control one-way valve |
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| CN113090296B (en) * | 2021-05-14 | 2022-02-08 | 丰隆高科液压股份有限公司 | Large-drift-diameter hydraulic control one-way valve |
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| CN103244155B (en) | 2015-07-29 |
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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. |