CN102788052A - Oil changing and buffering device and pilot hydraulic control system with same - Google Patents
Oil changing and buffering device and pilot hydraulic control system with same Download PDFInfo
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- CN102788052A CN102788052A CN2012102632562A CN201210263256A CN102788052A CN 102788052 A CN102788052 A CN 102788052A CN 2012102632562 A CN2012102632562 A CN 2012102632562A CN 201210263256 A CN201210263256 A CN 201210263256A CN 102788052 A CN102788052 A CN 102788052A
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Abstract
The invention relates to an oil changing and buffering device used in a pilot hydraulic control system, which solves the problems that the existing oil circuit requires a long preheating time and is slow to start, wherein two throttlers are connected in parallel between the oil inlet and oil outlet of a first one-way valve and the oil inlet and oil outlet of a second one-way valve respectively; the left control oil port of a three-position three-way reversing valve is communicated with the oil inlet A of the first one-way valve, the right control oil port is communicated with the oil inlet B of the second one-way valve, a left oil inlet a is communicated with the oil outlet C of the first one-way valve, the right oil inlet b is communicated with the oil outlet D of the second one-way valve, the oil outlets of the third one-way valve and the fourth one-way valve of an oil-changing oil circuit are correspondingly connected with the oil outlets of the first one-way valve and the second one-way valve, and the oil inlets thereof are oil-changing and intake port. The oil changing and buffering device used in the pilot hydraulic control system avoids the delay and stagnation of the starting action, causes no impact when stops, and at the same time can shorten the hydraulic oil preheating time in the pilot pipeline.
Description
Technical field
The present invention relates to a kind of changing oil and damping device, relate in particular to changing oil of using in a kind of guide's hydraulic control system and damping device and have guide's hydraulic control system of this device.
Background technique
For hydraulically powered equipment; Usually all be through pilot-actuated valve drive controlling selector valve; Action through selector valve realizes the control of hydraulic work device motion, in order to reduce the hydraulic shock that is produced when selector valve cuts out, between pilot-actuated valve and selector valve, inserts damping device; Slow down the reset speed of selector valve, reduce and impact.Existing damping device 20 comprises one-way valve and the flow controller parallelly connected with one-way valve.As shown in Figure 1; 1 mouthful of filler opening that connects first one-way valve 21 on the pilot-actuated valve; The oil outlet of first one-way valve connects the Xa chamber of selector valve 30,2 mouthfuls of filler openings that connect second one-way valve 22 of pilot-actuated valve, and the oil outlet of second one-way valve 22 connects the Xb chamber of selector valve; First throttle device 23 is parallelly connected with first one-way valve 21, and second flow controller 24 is parallelly connected with second one-way valve 22.When guide's control valve has action; Hydraulic oil flows to the Xa chamber of selector valve 30 from 1 mouthful of warp, first one-way valve 21 of pilot-actuated valve; Hydraulic oil in the Xb chamber of selector valve 30 flows to hydraulic oil container through second flow controller 24, pilot-actuated valve 2 mouthfuls and T mouth, thereby the spool of realizing promoting selector valve 30 moves and make selector valve 30 actions; When guide's control valve stops to move; The spool of selector valve 30 returns meta; To hydraulic oil container, the opposite side Xb chamber of selector valve 30 is then replenished by hydraulic oil 2 mouthfuls through pilot-actuated valve, second one-way valve 22 hydraulic oil in the Xa chamber of selector valve 30 through 1 mouthful of stream of the first throttle device of this side, pilot valve, T mouth.When the pilot valve counteragent, the flow direction of hydraulic oil is then reverse.Owing to the throttling action of flow controller is arranged, can slow down the valve core reset speed of selector valve when pilot valve fails, thereby the impact that stops to move is reduced.
Use guide's hydraulic control oil circuit of sort buffer structure also to have such problem usually; Though can arrive the Xa chamber of selector valve 30 fast through first one-way valve 21 and first throttle device 23 through guide's hydraulic oil of 1 mouthful of pilot-actuated valve 10; But flow to hydraulic oil container at the hydraulic oil in the other side Xb chamber of selector valve 30 then must be through an other side second flow controller 24 and pilot valve 2 mouthfuls, T mouth; Second flow controller 24 can reduce the speed that hydraulic oil flows out from the Xb chamber; Also just influence the toggle speed of selector valve 30, made the machine startup slow movement.The another kind of shortcoming of this structure is when the cold snap operation; When behind machine startup, the hydraulic system of machine being carried out preheating; Because before before the equipment action also being pilot valve and selector valve action; Pilot-actuated valve 10 all not have to open with selector valve 30, makes hydraulic oil between pilot-actuated valve and selector valve 30 can not circulate with hydraulic oil in the hydraulic system of machine and exchanges and can not get preheating, thereby influence the preheating efficient of machine to hydraulic system.
Summary of the invention
The technical problem that the present invention will solve is to cause the startup slow movement and the difficult problem of hydraulic oil preheating of selector valve to the damping device that uses on existing guide's hydraulic control oil circuit; And a kind of selector valve slow movement of promptly can eliminating is provided, can shorten changing oil and damping device and guide's hydraulic control system of guide's hydraulic oil preheat time again with this kind device.
The technological scheme that the present invention adopts is: construct changing oil and damping device of using on a kind of guide's hydraulic control oil circuit; It comprises first one-way valve, second one-way valve, 3-position-3-way selector valve, the oil circuit of changing oil; Parallelly connected first throttle device between the oil-feed A mouth of first one-way valve and the fuel-displaced C mouth; Parallelly connected second flow controller between the oil-feed B mouth of second one-way valve and the fuel-displaced C mouth; The left control port of 3-position-3-way selector valve is communicated with the oil-feed A mouth of first one-way valve, and the right control port of 3-position-3-way selector valve is communicated with the oil-feed B mouth of second one-way valve, and the left oil-feed a mouth of 3-position-3-way selector valve is communicated with the fuel-displaced C mouth of first one-way valve; The right oil-feed b mouth of 3-position-3-way selector valve is communicated with the fuel-displaced D mouth of second one-way valve; The oil circuit of changing oil comprises the 3rd one-way valve and the 4th one-way valve, the oil-feed interface of changing oil, and the oil outlet of the 3rd one-way valve and the 4th one-way valve is corresponding to be connected with the oil outlet of first one-way valve, second one-way valve, and the filler opening of the 3rd one-way valve and the 4th one-way valve is the oil-feed interface of changing oil.
Above-mentioned change oil and damping device in, the filler opening of the 3rd one-way valve and the 4th one-way valve is interconnected and is the oil-feed interface of changing oil.The filler opening of the 3rd one-way valve and the 4th one-way valve is interconnected can guarantee effectively that control chamber internal pressure pressure before the pilot-actuated valve action in selector valve both sides is equal, prevents to be caused by the oil circuit of changing oil the misoperation of selector valve.
Above-mentioned change oil and damping device in, the oil circuit of changing oil also comprises the 3rd flow controller, the 3rd flow controller is connected with the 3rd one-way valve, the 4th one-way valve.Hydraulic pressure oil mass between pilot-actuated valve and the selector valve is few usually; The oil circuit of changing oil only need be introduced a spot of preheating hydraulic oil can make this part hydraulic oil obtain preheating the replacement of the hydraulic oil between pilot-actuated valve and the selector valve; The oil circuit of changing oil is linked into the hydraulic system of machine usually and obtains by the hydraulic oil of preheating; And it is very high usually to be inserted hydraulic system pressure; Can control the oil mass that enters into the oil circuit of changing oil undoubtedly at the next oily direction of the 3rd, the 4th one-way valve the 3rd flow controller of connecting, to reduce the energy loss of system liquid pressing system.The 3rd flow controller can be a flow controller, and this flow controller is serially connected in the 3rd one-way valve and the 4th one-way valve is communicated with on the next oily direction of node.Also two flow controllers are arranged, be serially connected in the next oily direction of the 3rd, the 4th one-way valve respectively, these two flow controllers are coming oily direction to be communicated with by being communicated with contact; Also can be two flow controllers, one of them flow controller be serially connected between the 3rd one-way valve and the first throttle device, and an other flow controller is serially connected between the 4th one-way valve and second flow controller.
Above-mentioned change oil and damping device in, first one-way valve and first throttle device are the integrated type valve core structure, certain first one-way valve and first throttle device also can be split type valve core structures.Same second one-way valve and second flow controller can be the integrated type valve core structures, and also can make is split type valve core structure.
The present invention for the another kind of technological scheme that solves its technical problem and provide is: construct a kind of guide's hydraulic control system; It comprises pilot-actuated valve, selector valve; Also comprise changing oil and damping device in the foregoing invention, 1 mouthful of filler opening that is communicated with first one-way valve of pilot-actuated valve, 2 mouthfuls of filler openings that are communicated with second one-way valve of pilot-actuated valve; The Xa chamber of selector valve is communicated with the fuel-displaced C mouth of first one-way valve; The Xb chamber of selector valve is communicated with the fuel-displaced D mouth of second one-way valve, and the T mouth of 3-position-3-way selector valve is communicated with the hydraulic oil container loop, and the oil-feed interface of changing oil is communicated with the hydraulic oil supply system of equipment.This guide's hydraulic control system; When guide's control valve has action; Move from 1 mouthful of spool that flows out the Xa chamber promotion selector valve of hydraulic oil warp first one-way valve arrival selector valve of pilot-actuated valve; Simultaneously from the pressure oil of 1 mouthful of outflow of pilot-actuated valve also the spool that acts on the 3-position-3-way selector valve of the left control port through the 3-position-3-way selector valve be located at position, a left side, the hydraulic oil in selector valve Xb chamber then through the position, a left side of the oil-feed b of 3-position-3-way selector valve mouth, 3-position-3-way selector valve and the T mouth of 3-position-3-way selector valve flow to the pipeline of hydraulic oil container.If action and above-mentioned direction of action that pilot-actuated valve is done; Then the flow direction of hydraulic oil is also opposite; Be that the guide controls the 2 mouthful outflows of hydraulic oil through pilot-actuated valve; Promote changeover valve core moves and is exerted pressure in the Xa chamber through the Xb chamber that second one-way valve enters into selector valve round about; The spool that the right control port of hydraulic oil through the 3-position-3-way selector valve simultaneously acts on the 3-position-3-way selector valve is located at right position, the hydraulic oil in selector valve Xa chamber then through the right position of the oil-feed a of 3-position-3-way selector valve mouth, 3-position-3-way selector valve and the T mouth of 3-position-3-way selector valve flow to the pipeline of hydraulic oil container.Therefore, the hydraulic oil in selector valve Xa chamber and Xb chamber can get into and discharge all without flow controller fast when this guide's hydraulic control system started, and started the advantage that action does not postpone thereby have.And when not having operation on guide's control valve, 1 mouth pressure of pilot-actuated valve is reduced to tank pressure, and the spring of selector valve resets spool left, and the 3-position-3-way selector valve also is back to meta simultaneously; Selector valve Xa chamber hydraulic oil is discharged from, and gets into fuel-displaced C mouth, the first throttle device of first one-way valve, the oil-feed A mouth of first one-way valve by the road, gets back to fuel tank from 1 mouthful of pilot-actuated valve with the T mouth.Simultaneously the hydraulic oil through pilot-actuated valve 2 mouthfuls and second one-way valve replenish the Xb chamber; Perhaps 2 mouth pressures of pilot-actuated valve are reduced to tank pressure, and the spring of selector valve resets spool to the right, and the 3-position-3-way selector valve also is back to meta simultaneously; Selector valve Xb chamber hydraulic oil is discharged from, and gets into fuel-displaced D mouth, second flow controller of second one-way valve, the oil-feed B mouth of second one-way valve by the road, gets back to fuel tank from 2 mouthfuls of pilot-actuated valve with the T mouth.In the process that pilot-actuated valve stops to move, guide's hydraulic oil slows down the valve core reset speed of selector valve, thereby the impact that stops to move is reduced owing to the throttling action of having passed through the first throttle device or second flow controller.When machine during in the cold region operation; Carry out hot machine earlier before the action of machine startup rear working device; Promptly improve the temperature of hydraulic oil in the hydraulic system; Got into through the oil-feed interface of changing oil by the hydraulic oil of preheating; Flow through the 3rd one-way valve, the 4th one-way valve, first throttle device and second flow controller, pilot-actuated valve 1 mouthful and 2 mouthfuls of T mouths from pilot-actuated valve flow into the fuel tank loops, just make before pilot-actuated valve has action can be to pilot-actuated valve and selector valve between the hydraulic oil of oil circuit replace preheating, the preheating efficient of raising hydraulic oil.
Damping device of the present invention is used for guide's hydraulic control oil circuit; Compared with prior art; When the enterprising line operate of pilot-actuated valve; The 3-position-3-way selector valve of guide's hydraulic oil in the selector valve one side control chamber in damping device flows into the loop of hydraulic oil container, and the discharge of fluid need not passed through flow controller and can discharge rapidly, therefore can not cause the slow of selector valve action.Before the pilot-actuated valve action, the hydraulic oil between pilot-actuated valve and the selector valve can be replaced by the oil circuit of changing oil, thereby improves hydraulic oil preheating efficient.
Description of drawings
Fig. 1 is guide's hydraulic control system schematic diagram of existing damping device;
Fig. 2 is that the present invention changes oil and the structure principle chart of damping device;
Fig. 3 is guide's hydraulic control system schematic diagram in the embodiment of the invention.
Reference character:
Pilot-actuated valve 10, damping device 20, first one-way valve 21, second one-way valve 22, first throttle device 23, second flow controller 24,3-position-3-way selector valve 25, left control port 251, right control port 252, selector valve 30, the oil circuit 40 of changing oil, the 3rd one-way valve 41, the 4th one-way valve 42, be communicated with node 43, the 3rd flow controller 44.
Embodiment
Below in conjunction with the description of drawings specific embodiments.
Fig. 2 shows that the present invention changes oil and the structure principle chart of damping device.As shown in Figure 2; This is changed oil and damping device comprises first one-way valve 21 and second one-way valve 22,3-position-3-way selector valve 25, the oil circuit of changing oil; Parallelly connected first throttle device 23 between the oil-feed A mouth of first one-way valve 21 and the fuel-displaced C mouth; Parallelly connected second flow controller 24 between the oil-feed B mouth of second one-way valve 22 and the fuel-displaced C mouth; The left control port 251 of 3-position-3-way selector valve is communicated with the oil-feed A mouth of first one-way valve 21; The right control port 252 of 3-position-3-way selector valve 25 is communicated with the oil-feed B mouth of second one-way valve 22, and the left oil-feed a mouth of 3-position-3-way selector valve 25 is communicated with the fuel-displaced C mouth of first one-way valve 21, and the right oil-feed b mouth of 3-position-3-way selector valve 25 is communicated with the fuel-displaced D mouth of second one-way valve 22.The oil circuit of changing oil comprises the 3rd one-way valve 41 and the 4th one-way valve 42, the 3rd flow controller 44; The corresponding oil outlet C mouth with first one-way valve 21, second one-way valve 22 of the oil outlet of the 3rd one-way valve 41 and the 4th one-way valve 42 is connected with the D mouth; The filler opening of the 3rd one-way valve 41 and the 4th one-way valve 42 is coming the mutual UNICOM of oily direction; The filler opening that is connected in series the 3rd flow controller 44, the three flow controllers 44 in the next oily direction that is communicated with node 43 is the oil-feed interface P of oil circuit of changing oil.
Fig. 3 shows the structure principle chart of guide's hydraulic control system of the present invention; Have above-mentioned changing oil and damping device 20 in this control system; Also comprise pilot-actuated valve 10 and selector valve 30 in addition; The Xa chamber of selector valve 30 connects the fuel-displaced C mouth of first one-way valve 21, and the Xb chamber of selector valve 30 connects the fuel-displaced D mouth of second one-way valve 22,1 mouthful of oil-feed A mouth that connects first one-way valve 21 of pilot-actuated valve 10; 2 mouthfuls of oil-feed B mouths that connect second one-way valve 22 of pilot-actuated valve 10, the T mouth of 3-position-3-way selector valve 25 connects the fuel tank loop.Change oil and the P mouth of damping device 20 is connected with the hydraulic oil supply system of machine, realize changing oil.
At first above-mentioned guide's hydraulic control system has the effect that slows down impact; For example when the nothing operation is in meta on guide's control valve 10; 1 mouthful of pilot-actuated valve 10 and 2 mouth pressures are reduced to tank pressure; The spring of selector valve 30 resets spool left, and 3-position-3-way selector valve 25 also is back to meta simultaneously; Selector valve Xa chamber hydraulic oil is discharged from, and gets into fuel-displaced C mouth, the first throttle device 23 of first one-way valve 21, the oil-feed A mouth of first one-way valve 21 by the road, gets back to the fuel tank loop from 1 mouthful of pilot-actuated valve with the T mouth.The Xb chamber is then replenished by the hydraulic oil through pilot-actuated valve 2 mouthfuls and second one-way valve 22; Perhaps the spring of selector valve 30 resets spool to the right, and 3-position-3-way selector valve 25 also is back to meta simultaneously; Selector valve Xb chamber hydraulic oil is discharged from, and gets into fuel-displaced D mouth, second flow controller 24 of second one-way valve 22, the oil-feed B mouth of second one-way valve 22 by the road, gets back to fuel tank from 2 mouthfuls of pilot-actuated valve with the T mouth.In the process that pilot-actuated valve stops to move, guide's hydraulic oil plays buffer function because the throttling action of having passed through the first throttle device or second flow controller is slowed down the valve core reset speed of selector valve 30, thereby the impact that stops to move is reduced.
This guide's hydraulic control system; When guide's control valve has action; Like 1 mouthful of outflow hydraulic oil from pilot-actuated valve; Then hydraulic oil moves through the spool that first one-way valve 21 arrives the Xa chamber promotion selector valve 30 of selector valve 30; Simultaneously from the hydraulic oil of 1 mouthful of outflow of pilot-actuated valve also the spool that acts on 3-position-3-way selector valve 25 of the left control port 251 through 3-position-3-way selector valve 25 be located at position, a left side, the hydraulic oil in selector valve Xb chamber then through the position, a left side of the oil-feed b of 3-position-3-way selector valve 25 mouth, 3-position-3-way selector valve 25 and the T mouth of 3-position-3-way selector valve 25 flow to the pipeline of hydraulic oil container.If action and above-mentioned direction of action that pilot-actuated valve is done; Then the flow direction of hydraulic oil is also opposite; Be that the guide controls the 2 mouthful outflows of hydraulic oil through pilot-actuated valve 10; The Xb chamber promotion changeover valve core that enters into selector valve 30 through second one-way valve 22 moves round about; The spool that the right control port 252 of pressure oil through 3-position-3-way selector valve 25 simultaneously acts on 3-position-3-way selector valve 25 is located at right position, the hydraulic oil in selector valve Xa chamber then through the right position of the oil-feed a of 3-position-3-way selector valve 25 mouth, 3-position-3-way selector valve 25 and the T mouth of 3-position-3-way selector valve flow to the pipeline of hydraulic oil container.Therefore, the hydraulic oil in selector valve Xa chamber and Xb chamber can get into and discharge all without flow controller fast when this guide's hydraulic control system started, and started the advantage that action does not postpone thereby have.
In the present embodiment, first one-way valve 21 in the damping device can be that the integrated type valve core structure is one-way throttle valve with first throttle device 23.Same second one-way valve 22 and second flow controller 24 can be that the integrated type valve core structure is one-way throttle valve.
This kind guide hydraulic control system also has the preheating function of changing oil; As shown in Figure 3; The oil circuit of changing oil of the function of changing oil comprises the 3rd one-way valve 41 and the 4th one-way valve 42; The oil outlet of the 3rd one-way valve 41 connects the fuel-displaced C mouth of first one-way valve 21, and the oil outlet of the 4th one-way valve 42 connects the fuel-displaced D mouth of second one-way valve 22, and the filler opening of the 3rd one-way valve 41, the 4th one-way valve 42 is interconnected; The next oily direction that is communicated with node 43 at the filler opening of the 3rd one-way valve 41, the 4th one-way valve 42 is connected in series the 3rd flow controller 44, and is connected with the hydraulic oil supply system of machine through the oil-feed interface P mouth of changing oil.When the cold region operation; Before the action of machine startup rear working device, carry out hot machine operation earlier; Promptly improve the temperature of hydraulic oil in the hydraulic system;, got into through the 3rd flow controller 44 by the hydraulic oil of preheating, flow through 1 mouthful and 2 mouthfuls of T mouths inflow fuel tank oil circuits of first throttle device 23 and second flow controller 24, pilot-actuated valve 10 from pilot-actuated valve 10 through the filler opening of the 3rd one-way valve 41, the 4th one-way valve 42; Make just can be before pilot-actuated valve 10 has action to pilot-actuated valve valve and selector valve between the hydraulic oil of oil circuit replace preheating, the preheating efficient of raising hydraulic oil.
Claims (8)
1. change oil and damping device for one kind; It is characterized in that comprising first one-way valve, second one-way valve, 3-position-3-way selector valve, the oil circuit of changing oil; Parallelly connected first throttle device between the oil-feed A mouth of said first one-way valve and the fuel-displaced C mouth; Parallelly connected second flow controller between the oil-feed B mouth of second one-way valve and the fuel-displaced D mouth; The left control port of said 3-position-3-way selector valve is communicated with the oil-feed A mouth of first one-way valve, and the right control port of said 3-position-3-way selector valve is communicated with the oil-feed B mouth of second one-way valve, and the left oil-feed a mouth of said 3-position-3-way selector valve is communicated with the fuel-displaced C mouth of first one-way valve; The right oil-feed b mouth of said 3-position-3-way selector valve is communicated with the fuel-displaced D mouth of second one-way valve; The said oil circuit of changing oil comprises the 3rd one-way valve and the 4th one-way valve, the oil-feed interface of changing oil, and the oil outlet of said the 3rd one-way valve and the 4th one-way valve is corresponding to be connected with the oil outlet of first one-way valve, second one-way valve, and the filler opening of said the 3rd one-way valve and the 4th one-way valve is the oil-feed interface of changing oil.
2. according to claim 1 changing oil and damping device is characterized in that the filler opening of said the 3rd one-way valve and the 4th one-way valve is interconnected.
3. according to claim 1 and 2 changing oil and damping device is characterized in that the said oil circuit of changing oil also comprises the 3rd flow controller, and said the 3rd flow controller is connected with said the 3rd one-way valve, the 4th one-way valve.
4. according to claim 3 changing oil and damping device is characterized in that said joint the 3rd stream device is serially connected in the 3rd one-way valve and the 4th one-way valve is communicated with on the next oily direction of node.
5. according to claim 3 changing oil and damping device; It is characterized in that said the 3rd flow controller is two; One of them the 3rd flow controller is serially connected between the 3rd one-way valve and first one-way valve, and other one the 3rd flow controller is serially connected between the 4th one-way valve and second one-way valve.
6. according to claim 1 changing oil and damping device is characterized in that said first one-way valve and first throttle device are the integrated type valve core structure.
7. according to claim 1 or 6 described changing oil and damping device, it is characterized in that said second one-way valve and second flow controller are the integrated type valve core structure.
8. guide's hydraulic control system; Comprise pilot-actuated valve, selector valve; It is characterized in that also comprising each said changing oil and damping device in the claim 1 to 7; 1 mouthful of filler opening that is communicated with first one-way valve of said pilot-actuated valve, 2 mouthfuls of filler openings that are communicated with second one-way valve of said pilot-actuated valve, the Xa chamber of said selector valve is communicated with the fuel-displaced C mouth of first one-way valve; The Xb chamber of said selector valve is communicated with the fuel-displaced D mouth of second one-way valve, and the T mouth of said 3-position-3-way selector valve is communicated with the hydraulic oil container loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102632562A CN102788052A (en) | 2012-07-27 | 2012-07-27 | Oil changing and buffering device and pilot hydraulic control system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102632562A CN102788052A (en) | 2012-07-27 | 2012-07-27 | Oil changing and buffering device and pilot hydraulic control system with same |
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| Publication Number | Publication Date |
|---|---|
| CN102788052A true CN102788052A (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102632562A Pending CN102788052A (en) | 2012-07-27 | 2012-07-27 | Oil changing and buffering device and pilot hydraulic control system with same |
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| CN (1) | CN102788052A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088830A (en) * | 2014-07-30 | 2014-10-08 | 徐州重型机械有限公司 | Hydraulic system of crane and pilot type control valve thereof |
| CN107725887A (en) * | 2017-11-10 | 2018-02-23 | 徐工集团工程机械有限公司 | A kind of guide's end cap and valve core structure and hydraulic cushion control method for hydraulic valve cushioning effect |
| CN111577714A (en) * | 2020-05-18 | 2020-08-25 | 山东临工工程机械有限公司 | Hydraulic system and engineering machinery |
| CN117927522A (en) * | 2024-03-22 | 2024-04-26 | 山西斯普瑞机械制造股份有限公司 | Differential combination valve of mold closing cylinder of foam molding machine |
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| JPS6367406A (en) * | 1986-09-09 | 1988-03-26 | Hitachi Constr Mach Co Ltd | Hydraulic circuit |
| JPH04219504A (en) * | 1990-12-15 | 1992-08-10 | Kubota Corp | Hydraulic circuit structure for work vehicle |
| JPH0893709A (en) * | 1994-09-22 | 1996-04-09 | Shin Caterpillar Mitsubishi Ltd | Impact absorbing device in hydraulic circuit of hydraulic work machine |
| CN201738368U (en) * | 2010-04-14 | 2011-02-09 | 福田雷沃国际重工股份有限公司 | Hydraulic damping control loop of excavator |
| CN102296666A (en) * | 2011-06-23 | 2011-12-28 | 中外合资沃得重工（中国）有限公司 | Pilot buffer device of excavator hydraulic motor |
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- 2012-07-27 CN CN2012102632562A patent/CN102788052A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6367406A (en) * | 1986-09-09 | 1988-03-26 | Hitachi Constr Mach Co Ltd | Hydraulic circuit |
| JPH04219504A (en) * | 1990-12-15 | 1992-08-10 | Kubota Corp | Hydraulic circuit structure for work vehicle |
| JPH0893709A (en) * | 1994-09-22 | 1996-04-09 | Shin Caterpillar Mitsubishi Ltd | Impact absorbing device in hydraulic circuit of hydraulic work machine |
| CN201738368U (en) * | 2010-04-14 | 2011-02-09 | 福田雷沃国际重工股份有限公司 | Hydraulic damping control loop of excavator |
| CN102296666A (en) * | 2011-06-23 | 2011-12-28 | 中外合资沃得重工（中国）有限公司 | Pilot buffer device of excavator hydraulic motor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088830A (en) * | 2014-07-30 | 2014-10-08 | 徐州重型机械有限公司 | Hydraulic system of crane and pilot type control valve thereof |
| CN107725887A (en) * | 2017-11-10 | 2018-02-23 | 徐工集团工程机械有限公司 | A kind of guide's end cap and valve core structure and hydraulic cushion control method for hydraulic valve cushioning effect |
| CN107725887B (en) * | 2017-11-10 | 2019-08-23 | 徐工集团工程机械有限公司 | A kind of hydraulic valve buffer gear and hydraulic cushion control method |
| CN111577714A (en) * | 2020-05-18 | 2020-08-25 | 山东临工工程机械有限公司 | Hydraulic system and engineering machinery |
| CN117927522A (en) * | 2024-03-22 | 2024-04-26 | 山西斯普瑞机械制造股份有限公司 | Differential combination valve of mold closing cylinder of foam molding machine |
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Address after: Yancheng Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province, No. 588 213161 Applicant after: LIUGONG CHANGZHOU MACHINERY CO., LTD. Applicant after: Liugong Machinery Co., Ltd. Applicant after: Guangxi Liugong Machinery Co., Ltd. Applicant after: Liuzhou Liugong Hydraulic Parts Co., Ltd. Address before: Yancheng Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province, No. 588 213161 Applicant before: Liugong Changzhou Excvavtor Co., Ltd. Applicant before: Liugong Machinery Co., Ltd. Applicant before: Guangxi Liugong Machinery Co., Ltd. Applicant before: Liuzhou Liugong Hydraulic Parts Co., Ltd. |
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Application publication date: 20121121 |