CN101705951A - Self-compensating two-way synchronous reciprocating positioning and contraposition hydraulic system - Google Patents
Self-compensating two-way synchronous reciprocating positioning and contraposition hydraulic system Download PDFInfo
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- CN101705951A CN101705951A CN200910172784A CN200910172784A CN101705951A CN 101705951 A CN101705951 A CN 101705951A CN 200910172784 A CN200910172784 A CN 200910172784A CN 200910172784 A CN200910172784 A CN 200910172784A CN 101705951 A CN101705951 A CN 101705951A
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Abstract
The invention relates to a self-compensating two-way synchronous reciprocating positioning and contraposition hydraulic system, which belongs to a hydraulic transmission control technical device. A double piston rod power cylinder A (37) and a double piston rod power cylinder B (38) are both connected with an equal fluid distributor (28). The equal fluid distributor (28) is connected with a main reversing valve through a one-way valve. Two outlets of the main reversing valve (5) are in bridge connection with composite overflow valve groups (41). One outlet is connected to a hydraulic oil tank (1) through an oil filter (42), and the other outlet is connected to the hydraulic oil tank (1) through the one-way valve A (43) and a pressurized fluid source (3). The self-compensating two-way synchronous reciprocating positioning contraposition hydraulic system has the advantage that: the invention adopts the hydraulic system, can carry out self-compensating two-way synchronous reciprocating positioning and precise contraposition on a control device, can realize the movement with no vibration, and increases stationarity and accuracy of the control. The high-pressure liquids with the same volume are adopted and distributed to drive a power device of which the power cylinders with loads to do the two-way synchronous reciprocating motion. The arrangement of the two double piston rod power cylinders can realize the movement with no vibration.
Description
Technical field
The present invention relates to a kind of transmission control technique device of fluid power, particularly a kind of self-compensation type bi-directional synchronization contraposition hydraulic system of back and forth transposing.
Background technique
Along with the raising of production automaticity, the synchronism of motion requires more and more higher, and the industry that involves is more and more, and the field of use is more and more wider, and the synchronization control of fluid has obtained using widely because of the advantage of himself.
The synchronization control of fluid can be divided into that mechanical forced is synchronous, volume synchronously, proportional servo control is synchronous etc.Mechanical forced needs synchronously high machining accuracy, obtains very difficult, be prone in using simultaneously stuck, draw situation such as evil idea; Proportional servo control requires very high synchronously to technological know-how, involve great expense simultaneously, is not suitable for the occasion of common use; Though conventional volume is simple synchronously, easily realization, cheap, synchronization accuracy instability, synchronization error can become big with the accumulation of internal leakage.
Summary of the invention
The objective of the invention is to provide a kind of: simple in structure, cheap, can realize the continuous self-compensation type bi-directional synchronization contraposition hydraulic system of back and forth transposing.
The object of the present invention is achieved like this: two rod ram A (37) all are connected with fluid equivalent distributor (28) with two rod ram B (38), fluid equivalent distributor (28) is connected with main reversing valve by one-way valve, cross-over connection has compound relief valve group (41) in two outlets of main reversing valve (5), and an outlet is arrived hydraulic oil container (1) by oil purifier (42); Another outlet is arrived hydraulic oil container (1) by one-way valve A (43), source of pressurised fluid (3).
Described main reversing valve 5 comprises main reversing valve actuator port A (43), main reversing valve actuator port B (44), main reversing valve filler opening C (45), main reversing valve return opening (46), and main reversing valve actuator port A (43) is connected with one-way valve C (7), one-way valve E (9) with the interface A (10) of fluid equivalent distributor (28) simultaneously; Main reversing valve actuator port B (44) is connected with one-way valve B (6), one-way valve D (8) with the interface F (15) of fluid equivalent distributor (28) simultaneously; Main reversing valve filler opening C (45) is connected with the relief valve (39) of one-way valve A (4) and compound relief valve group (41) simultaneously, also connects pressure gauge by valve; Main reversing valve return opening (46) while is connected with oil purifier (42) with the other end of the relief valve (39) of compound relief valve group (41), and oil purifier (42) is gone into fuel tank by pipeline.
Described couple of rod ram A (37) comprises ram chamber A (29), ram chamber B (30), ram piston rod A (33) and ram piston rod B (34), on ram chamber A (29) and ram chamber B (30), an outlet is arranged all, be connected with ram piston rod A (33) and ram piston rod B (34) at the two ends of piston respectively; Two rod ram B (38) comprise ram cavity C (31), ram chamber D (32), ram piston rod C (35), ram piston rod D (36), on ram cavity C (31) and ram chamber D (3), an outlet is arranged all, be connected with ram piston rod C (35) and ram piston rod D (36) at the two ends of piston respectively.
Described fluid equivalent distributor (28) comprises interface A (10), interface B (11), interface C (12), interface D (13), interface E (14), interface F (15), urceolus group (16), rodless cavity chamber A (17), rod chamber chamber A (18), rod chamber chamber B (19), rod chamber chamber C (20), rod chamber chamber D (21), rodless cavity chamber B (22), interface G (23), interface H (24), interface J (25), interface K (26), interior bar group (27).
Described compound relief valve group 41 comprises relief valve (39), two four-way electromagnetic reversing valves (40), and two ports of two four-way electromagnetic reversing valves (40) are connected to two ends of relief valve (39).
Beneficial effect is owing to adopted such scheme, the present invention that three aspect contents are arranged: on the one hand, the present invention relates to a kind of hydraulic system.Hydraulic system comprises source of pressurised fluid and has the fluid equivalent distributor of two rodless cavity chambers and four rod chamber chambers.Hydraulic system also comprises the main reversing valve that is configured to make source of pressurised fluid and the alternative circulation of fluid equivalent distributor chamber, and is at main reversing valve and allows source of pressurised fluid pump the compound relief valve group of the non-loaded oil sump tank of fluid that comes when meta is not worked.Hydraulic system also comprises two rod rams of two identical specifications that are used for driving load.
On the other hand, the present invention relates to a kind of fluid equivalent distributor of special construction.It is made up of urceolus group and interior bar group, and interior bar group places in the urceolus group, forms six complete independent cavity, when interior bar group is moved, and capacity reducing of dilatation of two rodless cavities, and volume-variation is constantly identical; Two capacity reducings of two dilatations of four rodless cavities, and any cavity volume changes constantly identical.
The third aspect the present invention relates to a kind of mode of operation.This mode comprises the automatic compensation way of internal leakage between fluid equivalent distributor chamber and the Placement of two pairs of rod rams.
The present invention is simple in structure, cheap, can realize continuous self compensation, has reached purpose of the present invention.
Advantage: the present invention adopts this hydraulic system, can realize control gear is carried out self-compensation type bi-directional synchronization back and forth positioning and accurately contraposition, and can realize shockproof motion, has increased the stationarity and the accuracy of control.Utilization distributes the highly pressurised liquid of same volume to drive the ram band load and make the reciprocating power plant of bi-directional synchronization, and the outfit of two pairs of rod rams can realize shockproof motion.
Description of drawings
Fig. 1 is embodiment's a structural drawing.
Among the figure: 1, hydraulic oil container; 2, oil purifier; 3, source of pressurised fluid; 4, one-way valve A; 5, main reversing valve; 6, one-way valve B; 7, one-way valve C; 8, one-way valve D; 9, one-way valve E; 10, interface A; 11, interface B; 12, interface C; 13, interface D; 14, interface E; 15, interface F; 16, urceolus group; 17, rodless cavity chamber A; 18, rod chamber chamber A; 19, rod chamber chamber B; 20, rod chamber chamber C; 21, rod chamber chamber D; 22, rodless cavity chamber B; 23, interface G; 24, interface H; 25, interface J; 26, interface K; 27, interior bar group; 28, fluid equivalent distributor; 29, ram chamber A; 30, ram chamber B; 31, ram cavity C; 32, ram chamber D; 33, ram piston rod A; 34, ram piston rod B; 35, ram piston rod C; 36, ram piston rod D; 37, two rod ram A; 38, two rod ram B; 39, relief valve; 40, two four-way electromagnetic reversing valves; 41, compound relief valve group; 42, oil purifier; 43, main reversing valve actuator port A; 44, main reversing valve actuator port B; 45, main reversing valve filler opening C; 46, main reversing valve return opening.
Embodiment
Embodiment 1: two rod ram A37 all are connected with fluid equivalent distributor 28 with two rod ram B38, fluid equivalent distributor 28 is connected with main reversing valve by one-way valve, cross-over connection has 41, one outlets of compound relief valve group to arrive hydraulic oil container 1 by oil purifier 42 in two outlets of main reversing valve 5; Another outlet is arrived hydraulic oil container 1 by one-way valve A43, source of pressurised fluid 3.
Described main reversing valve 5 comprises main reversing valve actuator port A43, main reversing valve actuator port B44, main reversing valve filler opening C45, main reversing valve return opening 46, and main reversing valve actuator port A43 is connected with one-way valve C7, one-way valve E9 with the interface A10 of fluid equivalent distributor 28 simultaneously; Main reversing valve actuator port B44 is connected with one-way valve B6, one-way valve D8 with the interface F15 of fluid equivalent distributor 28 simultaneously; Main reversing valve filler opening C45 is connected with the relief valve 39 of one-way valve A4 and compound relief valve group 41 simultaneously, also connects pressure gauge by valve; Main reversing valve return opening 46 is connected with oil purifier 42 with the other end of the relief valve 39 of compound relief valve group 41 simultaneously, and oil purifier 42 is gone into fuel tank by pipeline.
Described couple of rod ram A37 comprises ram chamber A29, ram chamber B30, ram piston rod A33 and ram piston rod B34, on ram chamber A29 and ram chamber B30, an outlet is arranged all, be connected with ram piston rod A33 and ram piston rod B34 at the two ends of piston respectively; Two rod ram B38 comprise ram cavity C 31, ram chamber D32, ram piston rod C35, ram piston rod D36, on ram cavity C 31 and ram chamber D3, an outlet is arranged all, be connected with ram piston rod C35 and ram piston rod D36 at the two ends of piston respectively.
Described fluid equivalent distributor 28 comprises interface A10, interface B11, interface C12, interface D13, interface E14, interface F15, urceolus group 16, rodless cavity chamber A17, rod chamber chamber A18, rod chamber chamber B19, rod chamber chamber C20, rod chamber chamber D21, rodless cavity chamber B22, interface G23, interface H24, interface J25, interface K26, interior bar group 27.
Described compound relief valve group 41 comprises that two ports of relief valve 39, two 40, two four-way electromagnetic reversing valves 40 of four-way electromagnetic reversing valve are connected to two ends of relief valve 39.
Working principle:
Agent structure is that the high-pressure liquid that source of pressurised fluid 3 pumps promotes piston through the rodless cavity that main reversing valve 5 controls optionally enter fluid equivalent distributor 28, and the high-pressure liquid of extruding two bursts of moment equivalent from rod chamber is synchronized with the movement two rod ram A37 of two same specifications and two rod ram B38.Be superimposed to form a compound relief valve group 41 with two four-way electromagnetic reversing valves 40 and a relief valve 39 with latus rectum, and it is connected in parallel on the main reversing valve 5, the electromagnet of two four-way electromagnetic reversing valves 40 in the compound relief valve group 41 gets electronic any one electromagnet that is set to be subordinated to main reversing valve 5 and gets electronic work, this moment, relief valve played the pressurize effect, when two electromagnet of main reversing valve 5 all must not electricity promptly be in meta and work, the electromagnet of two four-way electromagnetic reversing valves 40 also must not, fluid reduces the useless consumption of power through two four-way electromagnetic reversing valves, 40 non-loaded oil sump tanks.
Cylinder barrel with several sections onesize internal diameters connects by flange, the auxilliary array of establishing seals, realize that fluid equivalent distributor urceolus group has three same size chambers, be threaded togather with two same pistons and a piston rod group, and guarantee equidistantly, interior bar group 27 is assembled on the urceolus group 16, and six chambers of formation during towards right motion, can be realized a rodless cavity chamber A17 dilatation in interior bar group; A rodless cavity chamber B22 capacity reducing, two rod chamber chamber volume-variation are constantly identical, two rod chamber chamber B19 and the D21 dilatation of rod chamber chamber; Two rod chamber chamber A18 and rod chamber chamber C20 capacity reducing, four rod chamber chamber volume-variation are constantly all identical; Interior bar group 27 is during towards left movement, and situation then is a rodless cavity chamber B22 dilatation, and rodless cavity chamber A17 capacity reducing, two rodless cavity chamber volume-variation are constantly identical; Two rod chamber chamber A18 and the C20 dilatation of rod chamber chamber, two rod chamber chamber B19 and rod chamber chamber D21 capacity reducing, four rod chamber chamber volume-variation are constantly all identical;
One-way valve B6 with four same specifications, one-way valve C7, the interface B11 of the oil outlet of one-way valve D8 and one-way valve E9 and fluid equivalent distributor, interface C12, interface D13 and interface E14 connect one to one, insert the main reversing valve actuator port B44 of main reversing valve 5 with the oil outlet butt joint back of one-way valve B6 and one-way valve D8, insert the main reversing valve actuator port A43 of main reversing valve 5 with the oil outlet butt joint back of one-way valve C7 and one-way valve E9, when getting electric main reversing valve 5, left side electromagnet is in a when position left side, system can realize that the rod chamber chamber B19 of convection cell equivalent distributor and rod chamber chamber D21 compensate topping up automatically in work, when another electromagnet gets electric main reversing valve 5 and is in right position, system can realize that the rod chamber chamber C20 of convection cell equivalent distributor and rodless cavity chamber B22 compensate topping up automatically in work, eliminate conventional volume synchronization accuracy instability, synchronization error becomes big phenomenon with the accumulation of internal leakage.
With two rod rams of two groups of identical specifications as actuator, the two ends power piston bar A33 of every group of power cylinder and ram piston rod B34 or ram piston rod C35 and ram piston rod D36 bar footpath according to reciprocating speed identical be set to identical; Or the piston rod bar footpath, two ends of every group of power cylinder is set to difference according to the reciprocating speed difference. the ram shaft two ends are fixed, and cylinder barrel is connected on the object that will move, and improves force-bearing situation, eliminate stuck phenomenon.
Prevent that with the oil purifier that is contained in the source of pressurised fluid filler opening impurity from entering system, guarantee the requirement of system element oil cleanliness; The oil outlet that is connected on source of pressurised fluid with one-way valve protects oil pump to avoid reverse fluid impact, and the working life of improving pump is with the pressure condition of the next in good time reflection of pressure gauge system.
The traversing vertical shift of the bridge formation machine overhead traveling crane mechanism that hydraulic system of the present invention has been installed can adjust the position relation of four groups of suspenders and four erection opening of the railway prefabricated beam of 900T quickly and accurately, and suspension hook vertically put into four erection opening, realized vertical lifting, reduced the skyborne amplitude of fluctuation of prefabricating beam greatly, optimization bridge formation machine bale handle is put the force-bearing situation in the beam process, thus the Security that improves the bridge formation machine.
Claims (5)
1. self-compensation type bi-directional synchronization contraposition hydraulic system of back and forth transposing, it is characterized in that: two rod ram A (37) all are connected with fluid equivalent distributor (28) with two rod ram B (38), fluid equivalent distributor (28) is connected with main reversing valve by one-way valve, cross-over connection has compound relief valve group (41) in two outlets of main reversing valve (5), and an outlet is arrived hydraulic oil container (1) by oil purifier (42); Another outlet is arrived hydraulic oil container (1) by one-way valve A (43), source of pressurised fluid (3).
2. the self-compensation type bi-directional synchronization according to claim 1 contraposition hydraulic system of back and forth transposing, it is characterized in that: described main reversing valve 5 comprises main reversing valve actuator port A (43), main reversing valve actuator port B (44), main reversing valve filler opening C (45), main reversing valve return opening (46), and main reversing valve actuator port A (43) is connected with one-way valve C (7), one-way valve E (9) with the interface A (10) of fluid equivalent distributor (28) simultaneously; Main reversing valve actuator port B (44) is connected with one-way valve B (6), one-way valve D (8) with the interface F (15) of fluid equivalent distributor (28) simultaneously; Main reversing valve filler opening C (45) is connected with the relief valve (39) of one-way valve A (4) and compound relief valve group (41) simultaneously, also connects pressure gauge by valve; Main reversing valve return opening (46) while is connected with oil purifier (42) with the other end of the relief valve (39) of compound relief valve group (41), and oil purifier (42) is gone into fuel tank by pipeline.
3. the self-compensation type bi-directional synchronization according to claim 1 contraposition hydraulic system of back and forth transposing, it is characterized in that: described couple of rod ram A (37) comprises ram chamber A (29), ram chamber B (30), ram piston rod A (33) and ram piston rod B (34), on ram chamber A (29) and ram chamber B (30), an outlet is arranged all, be connected with ram piston rod A (33) and ram piston rod B (34) at the two ends of piston respectively; Two rod ram B (38) comprise ram cavity C (31), ram chamber D (32), ram piston rod C (35), ram piston rod D (36), on ram cavity C (31) and ram chamber D (3), an outlet is arranged all, be connected with ram piston rod C (35) and ram piston rod D (36) at the two ends of piston respectively.
4. the self-compensation type bi-directional synchronization according to claim 1 contraposition hydraulic system of back and forth transposing, it is characterized in that: described fluid equivalent distributor (28) comprises interface A (10), interface B (11), interface C (12), interface D (13), interface E (14), interface F (15), urceolus group (16), rodless cavity chamber A (17), rod chamber chamber A (18), rod chamber chamber B (19), rod chamber chamber C (20), rod chamber chamber D (21), rodless cavity chamber B (22), interface G (23), interface H (24), interface J (25), interface K (26), interior bar group (27).
5. the self-compensation type bi-directional synchronization according to claim 1 contraposition hydraulic system of back and forth transposing, it is characterized in that: described compound relief valve group 41 comprises relief valve (39), two four-way electromagnetic reversing valves (40), and two ports of two four-way electromagnetic reversing valves (40) are connected to two ends of relief valve (39).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172784A CN101705951A (en) | 2009-11-17 | 2009-11-17 | Self-compensating two-way synchronous reciprocating positioning and contraposition hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172784A CN101705951A (en) | 2009-11-17 | 2009-11-17 | Self-compensating two-way synchronous reciprocating positioning and contraposition hydraulic system |
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| CN101705951A true CN101705951A (en) | 2010-05-12 |
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| CN102116326A (en) * | 2011-02-23 | 2011-07-06 | 周建新 | Hydraulic push-pull synchronization method and device thereof |
| CN104712609A (en) * | 2014-10-21 | 2015-06-17 | 上海元征机械设备有限责任公司 | Coaxial proportional output hydraulic device |
| EP2699804A4 (en) * | 2011-04-21 | 2015-07-29 | Actuant Corp | Synchronized lifting apparatus |
| CN106678112A (en) * | 2016-12-27 | 2017-05-17 | 武汉船用机械有限责任公司 | Underwater oil cylinder control system |
| CN107339283A (en) * | 2016-05-02 | 2017-11-10 | 斯塔比卢斯有限责任公司 | Fixing device |
| CN107939782A (en) * | 2017-11-14 | 2018-04-20 | 浙江大学宁波理工学院 | Wave maker and its hydraulic system |
| CN108869464A (en) * | 2018-08-02 | 2018-11-23 | 深圳领威科技有限公司 | A kind of application method of hydraulic device, hot chamber machine and hydraulic device |
| CN109538558A (en) * | 2018-12-11 | 2019-03-29 | 山东交通学院 | A kind of symmetrical hydraulic cylinder series connection propulsion system of shield excavation machine double piston-rod |
| CN109630488A (en) * | 2018-07-09 | 2019-04-16 | 襄阳博亚精工装备股份有限公司 | One pushes away the multistage hydraulic execution distributor for guaranteeing synchronization |
| CN109779991A (en) * | 2019-01-09 | 2019-05-21 | 煤炭科学技术研究院有限公司 | A kind of rigidity high-precision hydraulic synchronizing device |
| CN109868754A (en) * | 2019-04-12 | 2019-06-11 | 郑州市交通规划勘察设计研究院 | A kind of Bridge Erector hydraulic system and its application method |
| CN110744023A (en) * | 2019-10-12 | 2020-02-04 | 宣化钢铁集团有限责任公司 | Hydraulic device for transverse moving of overturning cooling bed of continuous casting machine |
| CN110862041A (en) * | 2019-12-17 | 2020-03-06 | 普罗格智芯科技(湖北)有限公司 | Synchronous hydraulic jacking system, hydraulic lifting system and hydraulic reversing system |
| WO2020220165A1 (en) * | 2019-04-28 | 2020-11-05 | 白保忠 | Mutual feedback automatic control device for dual fluid load, driving method therefor, and foot type mobile machine |
| CN112228418A (en) * | 2020-11-26 | 2021-01-15 | 太重集团榆次液压工业(济南)有限公司 | Hydraulic synchronization system based on volume control and control method |
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2009
- 2009-11-17 CN CN200910172784A patent/CN101705951A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116326A (en) * | 2011-02-23 | 2011-07-06 | 周建新 | Hydraulic push-pull synchronization method and device thereof |
| WO2012113233A1 (en) * | 2011-02-23 | 2012-08-30 | Zhou Jianxin | Hydraulic push-pull synchronization method and device thereof |
| CN102116326B (en) * | 2011-02-23 | 2013-06-19 | 周建新 | Hydraulic push-pull synchronization method and device thereof |
| EP2699804A4 (en) * | 2011-04-21 | 2015-07-29 | Actuant Corp | Synchronized lifting apparatus |
| CN104712609A (en) * | 2014-10-21 | 2015-06-17 | 上海元征机械设备有限责任公司 | Coaxial proportional output hydraulic device |
| CN107339283A (en) * | 2016-05-02 | 2017-11-10 | 斯塔比卢斯有限责任公司 | Fixing device |
| CN107339283B (en) * | 2016-05-02 | 2019-05-14 | 斯塔比卢斯有限责任公司 | Fixed device |
| CN106678112A (en) * | 2016-12-27 | 2017-05-17 | 武汉船用机械有限责任公司 | Underwater oil cylinder control system |
| CN107939782A (en) * | 2017-11-14 | 2018-04-20 | 浙江大学宁波理工学院 | Wave maker and its hydraulic system |
| CN107939782B (en) * | 2017-11-14 | 2019-05-28 | 浙江大学宁波理工学院 | Wave maker and its hydraulic system |
| CN109630488A (en) * | 2018-07-09 | 2019-04-16 | 襄阳博亚精工装备股份有限公司 | One pushes away the multistage hydraulic execution distributor for guaranteeing synchronization |
| CN109630488B (en) * | 2018-07-09 | 2024-05-07 | 襄阳博亚精工装备股份有限公司 | Hydraulic execution distributor capable of ensuring synchronization by one push-push multistage |
| CN108869464A (en) * | 2018-08-02 | 2018-11-23 | 深圳领威科技有限公司 | A kind of application method of hydraulic device, hot chamber machine and hydraulic device |
| CN108869464B (en) * | 2018-08-02 | 2024-04-05 | 深圳领威科技有限公司 | Hydraulic device, hot chamber die casting machine and use method of hydraulic device |
| CN109538558A (en) * | 2018-12-11 | 2019-03-29 | 山东交通学院 | A kind of symmetrical hydraulic cylinder series connection propulsion system of shield excavation machine double piston-rod |
| CN109779991A (en) * | 2019-01-09 | 2019-05-21 | 煤炭科学技术研究院有限公司 | A kind of rigidity high-precision hydraulic synchronizing device |
| CN109779991B (en) * | 2019-01-09 | 2020-08-07 | 煤炭科学技术研究院有限公司 | Rigid high-precision hydraulic synchronizing device |
| CN109868754A (en) * | 2019-04-12 | 2019-06-11 | 郑州市交通规划勘察设计研究院 | A kind of Bridge Erector hydraulic system and its application method |
| WO2020220165A1 (en) * | 2019-04-28 | 2020-11-05 | 白保忠 | Mutual feedback automatic control device for dual fluid load, driving method therefor, and foot type mobile machine |
| CN110744023A (en) * | 2019-10-12 | 2020-02-04 | 宣化钢铁集团有限责任公司 | Hydraulic device for transverse moving of overturning cooling bed of continuous casting machine |
| CN110862041A (en) * | 2019-12-17 | 2020-03-06 | 普罗格智芯科技(湖北)有限公司 | Synchronous hydraulic jacking system, hydraulic lifting system and hydraulic reversing system |
| CN110862041B (en) * | 2019-12-17 | 2023-11-07 | 普罗格智芯科技(湖北)有限公司 | Synchronous hydraulic jacking system, hydraulic lifting system and hydraulic reversing system |
| CN112228418A (en) * | 2020-11-26 | 2021-01-15 | 太重集团榆次液压工业(济南)有限公司 | Hydraulic synchronization system based on volume control and control method |
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Application publication date: 20100512 |