CN102135118B - Hydraulic control component and control circuit with same - Google Patents
Hydraulic control component and control circuit with same Download PDFInfo
- Publication number
- CN102135118B CN102135118B CN2011100953935A CN201110095393A CN102135118B CN 102135118 B CN102135118 B CN 102135118B CN 2011100953935 A CN2011100953935 A CN 2011100953935A CN 201110095393 A CN201110095393 A CN 201110095393A CN 102135118 B CN102135118 B CN 102135118B
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- oil cylinder
- hydraulic
- actuator port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a hydraulic control component and a control circuit with same. The hydraulic control component comprises a reversing valve; the reversing valve comprises an oil inlet, an oil returning hole, a first working oil hole and a second working oil hole; the hydraulic control component also comprises a back pressure valve and an oil supplementing valve, wherein the backpressure valve is connected with the oil returning hole; and the oil supplementing valve is connected with the second working oil hole. The invention also provides the control circuit applying the hydraulic control component. The hydraulic control component and the control circuit have the advantages that when an oil cylinder I expands, an oil passing chamber of the oil cylinder I is not emptily sucked, so that the crawling phenomenon is eliminated; when the oil cylinder I is shrunk, the oil cylinder I does not generate action lagging, an oil cylinder II does not reshrink along with the shrinking of the oil cylinder I; when the oil cylinders are in an idle state for a long time, oil in the oil passing chamber is not emptied, the oil passing chamber is filled with the oil all the time; when the oil cylinder II needs to shrink, the unusual sound due to impact is not generated as the oil passing chamber is not emptily sucked or discharged.
Description
Technical field
The present invention relates to Hydraulic Conirol Unit used in a kind of engineering machinery, relate in particular to a kind of Hydraulic Conirol Unit of controlling the truck crane telescopic boom and the control loop of applying it.
Background technique
Medium and small tonnage truck crane is in the market, in order to increase its sling height, generally adopted the two-stage telescopic oil cylinder, for the handling stationarity with moving that guarantees to stretch, this two-stage oil cylinder can not be worked simultaneously, can only work independently, the mutual switching of two-stage oil cylinder is to rely on a kind of electro hydraulic valve of special use to carry out in hydraulic system, on September 23rd, 2009, State Intellectual Property Office discloses the patent of invention of a kind of " a kind of electro hydraulic valve " by name, and the patent No. is 200820186729.2; On January 22nd, 2010, State Intellectual Property Office discloses again the patent of invention of a kind of " electromagnetic and hydraulic memory valve " by name, and application number is 201010110507.4, but following defect is arranged: while 1, contracting an oil cylinder, another oil cylinder also can synchronously bounce back; 2, there is the oil in oil cylinder easily to be drained or inhaled sky, causing the creeping phenomenon in telescopic process or produce and impact abnormal sound; Made its action commutation if 3, inhale empty oil cylinder, hydraulic oil must first be full of emptying or inhale empty space, will take the regular hour like this, causes action to lag behind.
Summary of the invention
In order to overcome above defect, technical problem to be solved by this invention be the defect for prior art provide a kind of namely guarantee two oil cylinders simultaneously retraction, do not produce creeping phenomenon or produce the Hydraulic Conirol Unit that impacts abnormal sound again, the present invention also provides a kind of control loop.
The present invention solves the problems of the technologies described above the technological scheme that adopts: a kind of Hydraulic Conirol Unit, it comprises selector valve, described selector valve comprises oil inlet P, oil return inlet T 0, the first actuator port a and the second actuator port b, described Hydraulic Conirol Unit also comprises back pressure valve and Fill valve, the hydraulic fluid port T0 ' of described back pressure valve is connected with oil return inlet T 0, the hydraulic fluid port b of Fill valve " is connected with the second actuator port b.
The present invention also provides a kind of control loop, the above-mentioned Hydraulic Conirol Unit of described control loop, oil cylinder I, oil cylinder II, the first oil circuit and the second oil circuit (oil circuit of top control valve stretchable sheet B mouth oil-feed A mouth oil return is the first oil circuit, and the oil circuit of top control valve stretchable sheet A mouth oil-feed B mouth oil return is the second oil circuit).Described Hydraulic Conirol Unit is arranged on the first oil circuit, and the first actuator port a of the selector valve of Hydraulic Conirol Unit communicates with the rodless cavity of oil cylinder I, and the second actuator port b communicates with the rodless cavity of oil cylinder II, and the second oil circuit communicates with the rod chamber of oil cylinder I and oil cylinder II.
Compared with prior art, advantage of the present invention is: when stretching oil cylinder I,, owing to having increased Fill valve on oil circuit, can not make the oil pocket of crossing of oil cylinder I inhale sky, thereby eliminate creeping phenomenon; When contracting oil cylinder I, because the oil of crossing oil pocket is in full state all the time, oil cylinder I just can not produce action and lag behind, and again because oil cylinder II has increased back pressure valve on its loop, this moment, back pressure valve can not opened, and oil cylinder II can not follow oil cylinder I retraction yet; When the oil cylinder long period did not work, owing to having increased back pressure valve, the oil of crossing oil pocket can not be drained, the oil of crossing oil pocket is in full state all the time, and will contracting oil cylinder II the time, owing to crossing oil pocket, is not inhaled empty or emptying, there is no air in oil, just can not produce the impact abnormal sound yet.
Description of drawings
Fig. 1 is the structural representation of Hydraulic Conirol Unit of the present invention;
Fig. 2 is the structural representation of back pressure valve;
Fig. 3 is the structural representation of Fill valve;
Fig. 4 is control loop hydraulic schematic diagram of the present invention.
In Fig. 1,10, back pressure valve, 20, Fill valve, 30, base plate, 40, pilot operated directional control valve, 41, valve body, 42, valve rod, 43, end cap, 50, solenoid valve, P, a, b, T0, be the external hydraulic fluid port on base plate 30, T1 is the oil pocket on base plate 30, and P ', a ', b ', T1 ', X, Y are the oil pocket on valve body 41; In Fig. 2,11, one-way valve seat, 12, spool, 13, spring, 14, spring seat; T0 ', T1 " are hydraulic fluid port; In Fig. 3,21, one-way valve seat, 22, spool, 23, spring, 24, spring seat; T0 ", b " is hydraulic fluid port; In Fig. 4,100, electro hydraulic valve, 200, top control valve stretchable sheet, 300, equilibrium valve, 400, equilibrium valve, 500, oil cylinder I, 600, oil cylinder II, P, a, b, T1 ", T0, A, B, Pk, T2 be hydraulic fluid port.
Embodiment
See also Fig. 1, take Hydraulic Conirol Unit as example explanation the present invention as electro hydraulic valve.electro hydraulic valve of the present invention comprises back pressure valve 10, Fill valve 20, base plate 30, pilot operated directional control valve 40 and solenoid valve 50, pilot operated directional control valve 40 is by valve body 41, valve rod 42 and end cap 43 form, solenoid valve 50 and base plate 30 are connected with valve body 41 by screw respectively, back pressure valve 10 and Fill valve 20 are inserted into respectively the two ends of base plate 30, valve rod 42 is placed in the main aperture of valve body 41, hydraulic fluid port P on base plate 30, a, b(is oil inlet P, the first actuator port a, the second actuator port b) respectively with valve body 41 on oil pocket P ', oil pocket a ', oil pocket b ' communicates, oil pocket T1 on base plate 30 is connected by inner oil duct and auxiliary hole with the oil pocket T1 ' on valve body 41, oil return inlet T 0 on base plate 30 " communicates with the hydraulic fluid port T0 ' of back pressure valve and the hydraulic fluid port T0 of Fill valve by inner oil duct.Be appreciated that described pilot operated directional control valve 40 can be the selector valve of other types, as electric control reversing valve or hand-operated direction valve, accordingly, if pilot operated directional control valve 40 is the selector valve of other types, solenoid valve 50 can omit, and controls the action of pilot operated directional control valve 40 with other modes.
Described back pressure valve 10 and/or Fill valve 20 communicate with described pilot operated directional control valve 40 by hydraulic pipe line.
See also Fig. 2, described back pressure valve 10 comprises one-way valve seat 11, spool 12, spring 13 and spring seat 14, spring 13 offsets with spool 12, hydraulic fluid port T1 " communicates with the oil pocket T1 ' on valve body 41 by base plate 30; hydraulic fluid port T0 ' communicates with external oil return inlet T 0 by the auxiliary hole of base plate 30; spool 12 can be that plunger type can be also steel ball type, and back pressure valve 10 can be one-way valve, also can be direct-acting overflow valve.
See also Fig. 3, described Fill valve 20 comprises one-way valve seat 21, spool 22, spring 23 and spring seat 24, spring 23 offsets with spool 22, hydraulic fluid port T0 " the auxiliary hole by base plate 30 communicates with external oil return inlet T 0; hydraulic fluid port b " in the auxiliary hole by base plate 30 and valve body 41 b ' oil pocket communicate, and with external the second actuator port b, communicate, spool 22 can be that plunger type can be also steel ball type, Fill valve 20 can be one-way valve, also can be direct-acting overflow valve.
The embodiment who applies a kind of control loop of above-mentioned Hydraulic Conirol Unit sees also Fig. 4, and " communicate, the oil outlet of back pressure valve 10 communicates with external oil return inlet T 0 the hydraulic fluid port T1 of the pilot operated directional control valve 40 in the filler opening of back pressure valve 10 and electro hydraulic valve 100; The filler opening of Fill valve 20 communicates with external oil return inlet T 0, and Fill valve 20 oil outlets directly communicate with the second actuator port b of pilot operated directional control valve 40; The oil inlet P of electro hydraulic valve 100 is connected with the hydraulic fluid port B that stretches out of stretchable sheet 200, the first actuator port a of electro hydraulic valve 100 communicates with the rodless cavity of 500 oil cylinder I after the one-way valve of equilibrium valve 300, the second actuator port b of electro hydraulic valve is by the oil pocket of crossing of 500 oil cylinder I, after the one-way valve of pipeline and equilibrium valve 400, communicate with the rodless cavity of oil cylinder 600,500 oil cylinder I are connected by external oil pipe with the rod chamber of oil cylinder 600, and with the retraction hydraulic fluid port A of stretchable sheet 200, are connected.
Described oil cylinder I comprises piston, offers the oil pocket of crossing that communicates with the second actuator port in piston; Described control loop also comprises operating valve and equilibrium valve 300, equilibrium valve 400, equilibrium valve 300 is arranged between the first actuator port a of the rodless cavity of oil cylinder I and Hydraulic Conirol Unit, equilibrium valve 400 is arranged on the rodless cavity of oil cylinder II and crossing between oil pocket of oil cylinder I, and the rod chamber of oil cylinder I communicates with the rod chamber of oil cylinder II; Upper operating valve stretchable sheet comprises hydraulic fluid port A and hydraulic fluid port B, and hydraulic fluid port A communicates with the rod chamber of oil cylinder I, and hydraulic fluid port B communicates with the oil inlet P of the selector valve of Hydraulic Conirol Unit; The filler opening of described Hydraulic Conirol Unit Fill valve and the oil outlet of back pressure valve all communicate with fuel tank.
The enforcement of control loop sees also Fig. 4, and back pressure valve 10 and Fill valve 20 can be made of one with pilot operated directional control valve 40, and namely electro hydraulic valve is shown in Fig. 1, comprises back pressure valve 10, Fill valve 20; Also back pressure valve 10 and Fill valve 20 can be connected on separately in pipeline by Fig. 4, by pipeline, with pilot operated directional control valve 40, be connected.When back pressure valve 10 and Fill valve 20 can be made of one with pilot operated directional control valve 40, described Hydraulic Conirol Unit was a control valve.While taking over separately, " communicate, the oil outlet of back pressure valve communicates with external oil return inlet T 0 the hydraulic fluid port T1 of the filler opening of back pressure valve 10 and pilot operated directional control valve 40; The filler opening of Fill valve communicates with external oil return inlet T 0, and the oil outlet of Fill valve directly communicates with the second actuator port b of pilot operated directional control valve 40.
its working procedure is as follows: when 500 oil cylinder I will stretch out, solenoid valve 50 no electric circuits, control oil sources and arrive at the oil pocket X of pilot operated directional control valve 40 through hydraulic fluid port Pk, make pilot operated directional control valve 40 be in right position, the hydraulic fluid port B of top control valve stretchable sheet 200 comes oily by oil inlet P, open after the one-way valve of equilibrium valve 300 rodless cavity that arrives at 500 oil cylinder I after the first actuator port a, the rod chamber of 500 oil cylinder I flows back to fuel tank through the hydraulic fluid port A of stretchable sheet 200, if this moment is without Fill valve 20, back pressure valve 10 can not be given the oil pocket repairing by reverse opening, the oil pocket of crossing in 500 oil cylinder I will be inhaled empty and be produced creeping phenomenon, when 600 oil cylinder II will stretch out, solenoid valve 50 energisings, control oil sources and arrive at the oil pocket Y of pilot operated directional control valve 40 through hydraulic fluid port Pk, make pilot operated directional control valve 40 be in left position, the hydraulic fluid port B of top control valve stretchable sheet 200 comes oily by oil inlet P and the second actuator port b, the oil pocket of crossing through 500 oil cylinder I arrives the rodless cavity of 600 oil cylinder II again after the one-way valve that pipeline is opened equilibrium valve 400, the rod chamber of 600 oil cylinder II flows back to fuel tank through hydraulic fluid port A again through the rod chamber of 500 oil cylinder I, when 500 oil cylinder I will retract, solenoid valve 50 no electric circuits, control oil sources and arrive at the oil pocket X of pilot operated directional control valve 40 through hydraulic fluid port Pk, make right position, pilot operated directional control valve 40 places, the hydraulic fluid port A of stretchable sheet 200 carrys out the oily rod chamber that can arrive simultaneously 500 oil cylinder I and 600 oil cylinder II, oil in 500 oil cylinder I in rodless cavity is opened equilibrium valve 300 through the first actuator port a, flow back to fuel tank after oil inlet P and hydraulic fluid port B, in 600 oil cylinder II, the oil of rodless cavity is also opened equilibrium valve 400, arrive the second actuator port b and hydraulic fluid port T1 after the oil pocket excessively of 500 oil cylinder I ", " connected back pressure valve 10 due to hydraulic fluid port T1, hydraulic fluid port T1 " oil this moment can not open back pressure valve, therefore 600 oil cylinder II can not follow 500 oil cylinder I and synchronously bounce back, 500 oil cylinder I long periods, while not working, its oil of crossing in oil pocket was blocked by back pressure valve 10, can not be drained, when if 600 oil cylinder II will retract, solenoid valve 50 energisings, control oil sources and arrive at the oil pocket Y of pilot operated directional control valve 40 through hydraulic fluid port Pk, make pilot operated directional control valve 40 be in left position, the hydraulic fluid port A of flexible valve block 200 carrys out the rod chamber of oily rear arrival 600 oil cylinder II, the oil return of rodless cavity is opened equilibrium valve 400 and is arrived the second actuator port b through the oil pocket of crossing of 500 oil cylinder I, and flows back to fuel tank after oil inlet P, hydraulic fluid port B.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned mode of execution; in technical conceive scope of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characteristics described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (6)
1. Hydraulic Conirol Unit, it comprises selector valve (40), described selector valve (40) comprises the first filler opening (P), return opening (T0), the first actuator port (a) and the second actuator port (b), it is characterized in that: described selector valve (40) is pilot operated directional control valve, and described Hydraulic Conirol Unit also comprises base plate (30), solenoid valve (50), back pressure valve (10) and Fill valve (20), described selector valve (40) is comprised of valve body (41), valve rod (42) and end cap (43), be provided with the first oil pocket (P '), the second oil pocket (a '), the 3rd oil pocket (b ') and oil back chamber (T1 ') in the valve body (41) of described selector valve (40), described base plate (30) is connected with valve body (41) by screw respectively with solenoid valve (50), and described back pressure valve (10) and Fill valve (20) are inserted into respectively the two ends of base plate (30), described back pressure valve (10) comprises the second filler opening (T1 ' ') and oil outlet (T0 '), the second filler opening of described back pressure valve (10) and the oil outlet of selector valve (40) (T1 ' ') be connected, its oil outlet (T0 ') be connected with return opening (T0), described Fill valve (20) comprises the 3rd filler opening (T0 ' ') and oil outlet (b ' '), the 3rd filler opening of described Fill valve (20) (T0 ' ') be connected with the first return opening (T0), its oil outlet (b ' ') be connected with the second actuator port (b), described base plate (30) is provided with described the first filler opening (P), the first actuator port (a) and the second actuator port (b), described the first filler opening (P) on described base plate (30), the first actuator port (a), the second actuator port (b) respectively with described selector valve (40) on described the first oil pocket (P '), the second oil pocket (a '), the 3rd oil pocket (b ') communicate by the auxiliary hole on base plate (30) and selector valve (40), described back pressure valve comprises the first one-way valve seat (11), the first spool (12), the first spring (13) and the first spring seat (14), described the first spring (13) offsets with the first spool (12), described Fill valve comprises the second one-way valve seat (21), the second spool (22), the second spring (23) and the second spring seat (24), and described the second spring (23) offsets with the second spool (22).
2. Hydraulic Conirol Unit according to claim 1, it is characterized in that: described back pressure valve (10) and/or Fill valve (20) communicate with described selector valve (40) by hydraulic pipe line.
3. Hydraulic Conirol Unit according to claim 1, it is characterized in that: described back pressure valve is one-way valve or direct-acting overflow valve.
4. Hydraulic Conirol Unit according to claim 1, it is characterized in that: Fill valve is one-way valve or direct-acting overflow valve.
5. control loop, it is characterized in that, described control loop comprises the described Hydraulic Conirol Unit of any one in claim 1-4, operating valve, the first oil cylinder (I), the second oil cylinder (II), the first oil circuit and the second oil circuit, described operating valve stretchable sheet comprises retraction hydraulic fluid port (A) and stretches out hydraulic fluid port (B), described Hydraulic Conirol Unit is arranged on the first oil circuit, first actuator port (a) of the selector valve of described Hydraulic Conirol Unit (40) communicates with the rodless cavity of the first oil cylinder, the second actuator port (b) communicates with the rodless cavity of the second oil cylinder, the rod chamber of the second oil circuit and the first oil cylinder and the second oil cylinder is logical, first filler opening (P) of described selector valve (40) communicates with the hydraulic fluid port (B) that stretches out of described stretchable sheet (200), described Fill valve (20) is connected between fuel tank and the second actuator port (b), described back pressure valve (10) is connected between the oil outlet (T1 ' ') of fuel tank and selector valve (40).
6. control loop according to claim 5, it is characterized in that: described the first oil cylinder comprises piston, offers the oil pocket of crossing that communicates with the second actuator port in piston; Described control loop also comprises the first equilibrium valve (300), the second equilibrium valve (400), described the first equilibrium valve (300) is arranged between first actuator port (a) of the rodless cavity of the first oil cylinder and Hydraulic Conirol Unit, described the second equilibrium valve (400) is arranged on the rodless cavity of the second oil cylinder and crossing between oil pocket of the first oil cylinder, and the rod chamber of the first oil cylinder communicates with the rod chamber of the second oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100953935A CN102135118B (en) | 2011-04-17 | 2011-04-17 | Hydraulic control component and control circuit with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100953935A CN102135118B (en) | 2011-04-17 | 2011-04-17 | Hydraulic control component and control circuit with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102135118A CN102135118A (en) | 2011-07-27 |
| CN102135118B true CN102135118B (en) | 2013-11-13 |
Family
ID=44295001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100953935A Active CN102135118B (en) | 2011-04-17 | 2011-04-17 | Hydraulic control component and control circuit with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102135118B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434506A (en) * | 2011-10-26 | 2012-05-02 | 中联重科股份有限公司 | Hydraulic control loop and crane |
| CN102374209B (en) * | 2011-11-08 | 2013-11-13 | 山西森尔科技有限公司 | Rigid telescopic oil tube with oil supply and oil discharge functions |
| CN104165166B (en) * | 2014-07-30 | 2016-08-24 | 株洲中研流体技术有限公司 | A kind of compact telescopic oil cylinder switching valve group |
| CN107165880B (en) * | 2017-06-30 | 2018-07-27 | 燕山大学 | A kind of ultra-high pressure high flow electro-hydraulic reversing valve |
| CN108361235B (en) * | 2018-04-24 | 2023-09-08 | 山河智能装备股份有限公司 | Compact hydraulic control back pressure valve and control method thereof |
| CN109958765B (en) * | 2019-04-26 | 2024-03-26 | 南京劲力变速器科技有限公司 | Hydraulic control system and front-mounted rear-drive hydraulic automatic gearbox comprising same |
| CN110552920B (en) * | 2019-09-27 | 2021-10-08 | 潍柴动力股份有限公司 | Valve body structure, hydraulic system and walking machinery for reducing back pressure |
| CN113719487B (en) * | 2021-07-21 | 2022-04-15 | 北京中金泰达电液科技有限公司 | Low-temperature hydraulic combined valve terminal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2219284Y (en) * | 1995-04-17 | 1996-02-07 | 安徽省三色照明总公司 | Truck crane capable of sequentially telescoping telescopic gib arm |
| CN2663706Y (en) * | 2003-12-19 | 2004-12-15 | 中国重型汽车集团有限公司 | Complex functional hydraulic valve |
| CN201080932Y (en) * | 2007-04-30 | 2008-07-02 | 江苏鼎晟液压有限公司 | Control valve assembly |
| CN201125888Y (en) * | 2007-11-20 | 2008-10-01 | 吴登中 | Bottom plate type overflow valve |
| CN101387308A (en) * | 2007-09-14 | 2009-03-18 | 陕西汽车集团有限责任公司 | Hydraulic support shaft control valve assembly |
| CN101852223A (en) * | 2009-03-30 | 2010-10-06 | 徐州重型机械有限公司 | Hydraulic control valves and telescopic arm control system with the same |
| CN202118019U (en) * | 2011-04-17 | 2012-01-18 | 常德中联重科液压有限公司 | Hydraulic control component and control loop applying same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001355604A (en) * | 2000-06-14 | 2001-12-26 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit for construction machinery |
-
2011
- 2011-04-17 CN CN2011100953935A patent/CN102135118B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2219284Y (en) * | 1995-04-17 | 1996-02-07 | 安徽省三色照明总公司 | Truck crane capable of sequentially telescoping telescopic gib arm |
| CN2663706Y (en) * | 2003-12-19 | 2004-12-15 | 中国重型汽车集团有限公司 | Complex functional hydraulic valve |
| CN201080932Y (en) * | 2007-04-30 | 2008-07-02 | 江苏鼎晟液压有限公司 | Control valve assembly |
| CN101387308A (en) * | 2007-09-14 | 2009-03-18 | 陕西汽车集团有限责任公司 | Hydraulic support shaft control valve assembly |
| CN201125888Y (en) * | 2007-11-20 | 2008-10-01 | 吴登中 | Bottom plate type overflow valve |
| CN101852223A (en) * | 2009-03-30 | 2010-10-06 | 徐州重型机械有限公司 | Hydraulic control valves and telescopic arm control system with the same |
| CN202118019U (en) * | 2011-04-17 | 2012-01-18 | 常德中联重科液压有限公司 | Hydraulic control component and control loop applying same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102135118A (en) | 2011-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202118019U (en) | Hydraulic control component and control loop applying same | |
| CN102135118B (en) | Hydraulic control component and control circuit with same | |
| CN103603840B (en) | Integrated hydraulic valve group and hydraulic driving system and concrete pump | |
| CN203770272U (en) | Integrated hydraulic valve set, hydraulic drive system and concrete pump | |
| CN104692266B (en) | Hydraulic system for telescopic buffer of crane boom and crane | |
| CN203532390U (en) | Hydraulic cylinder quick motion loop and engineering machine | |
| CN102619794B (en) | Single-cylinder bolt expansion and contraction control system and construction machine | |
| CN102996553B (en) | Support leg hydraulic system and engineering machinery | |
| CN104988963A (en) | Hydraulic excavator movable arm potential energy recovery system | |
| CN202322045U (en) | Hydraulic control loop for hydraulic cylinder, as well as crane | |
| CN104328812A (en) | Hydraulic system for realizing flat pushing function of forward excavator | |
| CN204175679U (en) | Bidirectional booster cylinder, pressurization system and vehicle | |
| CN103420290B (en) | Telescopic protection system and crane | |
| WO2012129042A1 (en) | Regeneration circuit | |
| CN104061199B (en) | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof | |
| EP1970571A3 (en) | Hydraulic circuit for construction machine | |
| CN203770266U (en) | Hydraulic pumping system and concrete pumping equipment | |
| CN103883576A (en) | Pounder hydraulic system and engineering machinery | |
| CN202579379U (en) | Single-cylinder bolt expansion control system and engineering machine | |
| CN203770245U (en) | Integrated hydraulic valve set, hydraulic drive system and concrete pump | |
| CN203948359U (en) | The hydraulic system of engineering machinery and engineering machinery | |
| CN204003684U (en) | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof | |
| US10690151B2 (en) | Device for recovering hydraulic energy by connecting two differential cylinders | |
| CN104481944A (en) | Depressurizing system and engineering machinery | |
| CN107208399B (en) | Control valve for construction equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |