CN202851495U - Hydraulic system valve switching device and crawler crane purpose hydraulic system - Google Patents
Hydraulic system valve switching device and crawler crane purpose hydraulic system Download PDFInfo
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- CN202851495U CN202851495U CN 201220504466 CN201220504466U CN202851495U CN 202851495 U CN202851495 U CN 202851495U CN 201220504466 CN201220504466 CN 201220504466 CN 201220504466 U CN201220504466 U CN 201220504466U CN 202851495 U CN202851495 U CN 202851495U
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Abstract
The utility model provides a hydraulic system valve switching device and a crawler crane purpose hydraulic system. Under the state that a first actuator is driven, a first solenoid valve (Y101) controls a first cartridge valve (C1) and a second cartridge valve (C2) to be opened, and pressure oil is enabled to flow into the first actuator; and a first reflux check valve (D1) controls a third cartridge valve (C3) and a fourth cartridge valve (C4) to be closed. Under the state that a second actuator is driven, a second solenoid valve (Y102) controls the third cartridge valve (C3) and the fourth cartridge valve (C4) to be opened, the pressure oil is enabled to flow into the second actuator; and a second reflux check valve (D5) the first cartridge valve (C1) and the second cartridge valve (C2) to be closed. According to the hydraulic system valve switching device and the crawler crane purpose hydraulic system, the purpose that two actuators are driven by one pump is achieved, false operations are effectively prevented, the power utilization ratio is high, the structure is simple, manufacturability is good, and the requirements of large flow and high pressure for the hydraulic system can be met.
Description
Technical field
The utility model relates to the hydraulics field, relates in particular to a kind of selector valve device and crawler crane hydraulic system of hydraulic system.
Background technique
Along with crawler crane to the super-tonnage future development, operating mode becomes increasingly complex, actuator's quantity is also more and more, security of operation, steadily, reliability requirement is higher.Traditional crawler crane hydraulic system generally adopts open system, coupling for equilibrium valve, multi-way valve, motor etc. in the crawler crane open type hydraulic system is difficult point, if mate that bad shake, downslide, speed are slow with regard to having, the problem such as inefficiency, elevator are asynchronous.More external crawler crane producers are general to adopt advanced closed type hydraulic system, and it is little that closed system has the circuit pressure loss, operates steadily, controllability is strong and the advantage such as compact structure.Usually drive a kind of actuator with an oil pump in the closed system, higher to the quantity demand of pump.As adopt switching valve to carry out the oil circuit switching, then can reduce the usage quantity of pump.
The multiple directional control valve that adopts in the crawler crane open system at present can realize that a pump is to the driving of many actuators.At first, prior art is to be applied to open type hydraulic system, rely on multi-way valve to commutate, but because its sliding valve structure has a little less than leakage, the through-current capability, and the pressure loss is large, and heating value is large, cost is relatively high.
Summary of the invention
In view of this, a technical problem to be solved in the utility model provides a kind of selector valve device of hydraulic system, can realize that a pump drives two actuators.
A kind of selector valve device of hydraulic system comprises the first control valve group, the second control valve group, pump filler opening A11, blowback hydraulic fluid port B11, the first filler opening A12, the first return opening B12, the second filler opening A13, the second return opening B13; Described the first control valve group comprises: the first cartridge valve C1, the second cartridge valve C2, the first solenoid valve Y101 and the first adverse current one-way valve D1; Described the second control valve group comprises: the 3rd cartridge valve C3, the 4th cartridge valve C4, the second solenoid valve Y102 and the second adverse current one-way valve D5; Described pump filler opening A11, described the first cartridge valve C1 and described the first filler opening A12 form the first oil-feed path; Described the first return opening B12, described the second cartridge valve (C2) and described blowback hydraulic fluid port B11 form the first way to cycle oil; Described pump filler opening A11, described the 3rd cartridge valve C3 and the second filler opening A13 form the second oil-feed path; Described the second return opening B13, described the 4th cartridge valve C4 and described blowback hydraulic fluid port B11 form the second way to cycle oil; Described the first solenoid valve Y101 is connected with the first cartridge valve C1, the second cartridge valve C2 respectively; The end of described the first adverse current one-way valve D1 is connected with the 3rd cartridge valve C3, the 4th cartridge valve C4 respectively, and the other end is connected on described the first oil-feed path; Described the second solenoid valve Y102 is connected with the 3rd cartridge valve C3, the 4th cartridge valve C4 respectively; The end of described the second adverse current one-way valve D5 is connected with the first cartridge valve C1, the second cartridge valve C2 respectively, and the other end is connected on the second oil-feed path; Under the state that drives the first actuator, described the first solenoid valve Y101 control described the first cartridge valve C1 and the second cartridge valve C2 open-minded, make pressure oil enter described the first oil-feed path and input the first actuator, and the oil return of the first actuator is returned by described the first way to cycle oil; Pressure oil in the first oil-feed path enters the 3rd cartridge valve C3 and the 4th cartridge valve C4 by described the first adverse current one-way valve D1, controls described the 3rd cartridge valve C3 and the 4th cartridge valve C4 sealing, disconnects described the second oil-feed path and the second way to cycle oil; Driving under the state of the second actuator, described the second solenoid valve Y102 control described the 3rd cartridge valve C3 and the 4th cartridge valve C4 open-minded, make pressure oil enter described the second oil-feed path and input the second actuator; The oil return of the second actuator is returned by described the second way to cycle oil; Pressure oil in the second oil-feed path enters the first cartridge valve C1 and the second cartridge valve C2 by described the second adverse current one-way valve D5, controls the first cartridge valve C1 and the second cartridge valve C2 sealing, disconnects described the first oil-feed path and the first way to cycle oil.
According to an embodiment of selector valve device of the present utility model, further, at the first oil-feed path the first relief valve Y1 is set; At the second oil-feed path the 3rd relief valve Y3 is set.
According to an embodiment of selector valve device of the present utility model, further, at the first way to cycle oil the second relief valve Y2 is set; At the second way to cycle oil the 4th relief valve Y4 is set.
According to an embodiment of selector valve device of the present utility model, further, described the first control valve group also comprises: the 3rd adverse current one-way valve D2; The end of described the 3rd adverse current one-way valve D2 is connected with the 4th cartridge valve C4 with the 3rd cartridge valve C3 respectively, and the other end is connected on described the first way to cycle oil; Under the state that drives the first actuator, pressure oil in the first way to cycle oil enters the 3rd cartridge valve (C3) and the 4th cartridge valve C4 by the 3rd adverse current one-way valve D2, control described the 3rd cartridge valve C3 and the 4th cartridge valve C4 sealing, disconnect described the second oil-feed path and the second way to cycle oil.
According to an embodiment of selector valve device of the present utility model, further, described the second control valve group also comprises: the 4th adverse current one-way valve D6; The end of described the 4th adverse current one-way valve D6 respectively with the first cartridge valve C1 be connected cartridge valve C2 and be connected, the other end is connected on described the second way to cycle oil; Under the state that drives the second actuator, pressure oil in the second way to cycle oil enters the first cartridge valve C1 and the second cartridge valve C2 by the 4th adverse current one-way valve D6, control the first cartridge valve C1 and the second cartridge valve C2 sealing, disconnect described the first oil-feed path and the first way to cycle oil.
According to an embodiment of selector valve device of the present utility model, further, described selector valve device also comprises the 5th adverse current one-way valve D3; The end of described the 5th adverse current one-way valve D3 is connected with described the first oil-feed path, and the other end connects measuring cell.
According to an embodiment of selector valve device of the present utility model, further, on described the first oil-feed path, the second oil-feed path, the first way to cycle oil and the second way to cycle oil, pressure-measuring point is set all; Load cell all is set on described pressure-measuring point.
According to an embodiment of selector valve device of the present utility model, further, described selector valve device also comprises warning device; When the oil pressure in described the first oil-feed path, the second oil-feed path, the first way to cycle oil or the second way to cycle oil during greater than the pressure threshold set, then described pressure transducer sends alarm signal to described warning device.
A kind of crawler crane hydraulic system comprises the selector valve device of above-mentioned hydraulic system.
The selector valve device of hydraulic system of the present utility model can realize that a pump drives two actuators, can effectively prevent misoperation, and power utilization is higher, and simple in structure, good manufacturability can satisfy the large flow to hydraulic system, the demand of high pressure.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the oil circuit switching schematic representation according to an embodiment of the selector valve device of hydraulic system of the present utility model;
Fig. 2 is the schematic representation according to an embodiment of the selector valve device of hydraulic system of the present utility model.
Embodiment
With reference to the accompanying drawings the utility model is described more fully, exemplary embodiment of the present utility model wherein is described.Below in conjunction with the accompanying drawing among the utility model embodiment, the technological scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under the creative work prerequisite, all belong to the scope of the utility model protection.Below in conjunction with figure and embodiment the technical solution of the utility model is carried out many-sided description.
Fig. 1 is the oil circuit switching schematic representation according to an embodiment of the selector valve device of hydraulic system of the present utility model; As shown in the figure, pump 1 pressure oil output demand motive the first actuator 3 and the second actuator 4 realize that by selector valve device 2 of the present utility model a pump drives two actuators.
Fig. 2 is the schematic representation according to an embodiment of the selector valve device of hydraulic system of the present utility model.As shown in the figure, the selector valve device of hydraulic system comprises the first control valve group, the second control valve group, pump filler opening A11, blowback hydraulic fluid port B11, the first filler opening A12, the first return opening B12, the second filler opening A13, the second return opening B13.
The first control valve group comprises: the first cartridge valve C1, the second cartridge valve C2, the first solenoid valve Y101 and the first adverse current one-way valve D1; The second control valve group comprises: the 3rd cartridge valve C3, the 4th cartridge valve C4, the second solenoid valve Y102 and the second adverse current one-way valve D5; Pump filler opening A11, the first cartridge valve C1 and the first filler opening A12 form the first oil-feed path.
The first return opening B12, the second cartridge valve C2 and blowback hydraulic fluid port B11 form the first way to cycle oil; Pump filler opening A11, the 3rd cartridge valve C3 and the second filler opening A13 form the second oil-feed path; The second return opening B13, the 4th cartridge valve C4 and blowback hydraulic fluid port B11 form the second way to cycle oil.
Cartridge valve is the assembly that a kind of element with control function forms, and inserts the valve piece and the valve that consists of, mainly realizes the on-off on liquid road, when being used in combination with common hydraulic control valve, realizes the control to system's fluid direction, pressure and flow.Solenoid valve is the industry equipment with Electromagnetic Control, is used in direction, flow, speed and other the parameter of adjusting medium in the industrial control system.Solenoid valve can cooperate different circuit to realize the control of expecting, and precision and the flexibility of control can both guarantee.Solenoid valve has a variety of, and different solenoid valves plays a role at the diverse location of control system.The adverse current one-way valve is a kind ofly to prevent the valve of oil stream reverse flow for hydraulic system, and the medium that passes through can only flow out along single direction, as the then valve closing that refluxes.
The first solenoid valve Y101 is connected with the first cartridge valve C1, the second cartridge valve C2 respectively.The end of the first adverse current one-way valve D1 is connected with the 3rd cartridge valve C3, the 4th cartridge valve C4 respectively, and the other end is connected on the first oil-feed path.The second solenoid valve Y102 is connected with the 3rd cartridge valve C3, the 4th cartridge valve C4 respectively.The end of the second adverse current one-way valve D5 is connected with the first cartridge valve C1, the second cartridge valve C2 respectively, and the other end is connected on the second oil-feed path.
Under the state that drives the first actuator, the first solenoid valve Y101 controls the first cartridge valve C1 and the second cartridge valve C2 is open-minded, make pressure oil enter the first oil-feed path and input the first actuator, and the oil return of the first actuator is returned by the first way to cycle oil; Pressure oil in the first oil-feed path enters the 3rd cartridge valve C3 and the 4th cartridge valve C4 by the first adverse current one-way valve D1, controls the 3rd cartridge valve C3 and the 4th cartridge valve C4 sealing, disconnects the second oil-feed path and the second way to cycle oil.
Under the state that drives the second actuator, the second solenoid valve Y102 controls the 3rd cartridge valve C3 and the 4th cartridge valve C4 is open-minded, makes pressure oil enter the second oil-feed path and input the second actuator; The oil return of the second actuator is returned by the second way to cycle oil; Pressure oil in the second oil-feed path enters the first cartridge valve C1 and the second cartridge valve C2 by the second adverse current one-way valve D5, controls the first cartridge valve C1 and the second cartridge valve C2 sealing, disconnects the first oil-feed path and the first way to cycle oil.
According to an embodiment of the present utility model, at the first oil-feed path the first relief valve Y1 is set; At the second oil-feed path the 3rd relief valve Y3 is set.At the first way to cycle oil the second relief valve Y2 is set; At the second way to cycle oil the 4th relief valve Y4 is set.Relief valve mainly plays level pressure overflow effect, voltage stabilizing, system unloaded and safety protection effect in hydraulic equipment.Be provided with relief valve on each oil circuit of switching valve, eliminate system peak pressure, guarantee that security of system is reliable.The general setting, the pressure threshold of the first relief valve Y1 and the 3rd relief valve Y3 is 35MPa, the pressure threshold of the second relief valve Y2 and the 4th relief valve Y4 is 10MPa.
According to an embodiment of the present utility model, the first control valve group also comprises: the 3rd adverse current one-way valve D2.The end of the 3rd adverse current one-way valve D2 is connected with the 4th cartridge valve C4 with the 3rd cartridge valve C3 respectively, and the other end is connected on the first way to cycle oil.Under the state that drives the first actuator, pressure oil in the first way to cycle oil enters the 3rd cartridge valve (C3) and the 4th cartridge valve C4 by the 3rd adverse current one-way valve D2, control the 3rd cartridge valve C3 and the 4th cartridge valve C4 sealing, disconnect the second oil-feed path and the second way to cycle oil.
The second control valve group also comprises: the 4th adverse current one-way valve D6; The end of the 4th adverse current one-way valve D6 respectively with the first cartridge valve C1 be connected cartridge valve C2 and be connected, the other end is connected on the second way to cycle oil; Under the state that drives the second actuator, pressure oil in the second way to cycle oil enters the first cartridge valve C1 and the second cartridge valve C2 by the 4th adverse current one-way valve D6, control the first cartridge valve C1 and the second cartridge valve C2 sealing, disconnect the first oil-feed path and the first way to cycle oil.
According to an embodiment of the present utility model, selector valve device also comprises the 5th adverse current one-way valve D3; The end of the 5th adverse current one-way valve D3 is connected with the first oil-feed path, and the other end connects measuring cell.On the first oil-feed path, the second oil-feed path, the first way to cycle oil and the second way to cycle oil, pressure-measuring point is set all; Load cell (not drawing in Fig. 2) all is being set on the pressure-measuring point.Selector valve device also comprises warning device (in Fig. 2 for drawing).When the oil pressure in the first oil-feed path, the second oil-feed path, the first way to cycle oil or the second way to cycle oil during greater than the pressure threshold set, then pressure transducer sends alarm signal to warning device.
According to an embodiment of the present utility model, employed pump is oil hydraulic pump and oil hydraulic motor.Employed cartridge valve is a kind ofly to have spring chamber and be positioned at the cartridge valve of the epicoele on spring chamber top, the closure of the extension and contraction control epicoele by the spring chamber medi-spring, thereby the control cartridge valve open and closed.
When oil circuit switched to the first actuator, the outlet of the pressure oil of pump connected the A11 mouth, and the inlet port of pump connects the B11 mouth.Solenoid valve Y101 gets electric, cartridge valve C1, C2 spring chamber are directly by the left position of solenoid valve Y101 return, delivery side of pump pressure oil directly enters cartridge valve C1 epicoele and overcomes very little spring force cartridge valve is opened, this moment, pressure oil will directly enter actuator's actuator port by the A12 mouth, the cartridge valve C2 that oil return will enter the B12 mouth and open is connected to the pump inlet port by B11.Pressure oil enters right side cartridge valve C3, C4 spring chamber by adverse current one-way valve D1, and the elongation of spring is locked with epicoele, prevents that the second control valve group from opening and the misoperation that produces.
When oil circuit switches to the second actuator, solenoid valve Y102 gets electric, cartridge valve C3, C4 spring chamber are directly by the left position of solenoid valve Y102 return, delivery side of pump pressure oil directly enters cartridge valve C3 epicoele and overcomes very little spring force cartridge valve is opened, this moment, pressure oil will directly enter actuator's actuator port by the A13 mouth, the cartridge valve C4 that oil return will enter the B13 mouth and open is connected to the pump inlet port by B11.Pressure oil enters cartridge valve C1, C2 spring chamber by adverse current one-way valve D5, and the elongation of spring is locked with epicoele, prevents that the first control valve group from opening and the misoperation that produces.
Be provided with M11, M12A, M12B, M13A, M13B pressure-measuring point at each oil circuit, be used for monitoring at any time each oil circuit pressure.The effect of adverse current one-way valve D4 be from oil circuit that A11, B11 are connected select to have the oil circuit of larger pressure, the control oil sources is provided.The T mouth is the leakage way of selector valve device inside.
According to an embodiment of the present utility model, crawler crane comprises the selector valve device of above-mentioned hydraulic system with hydraulic system.
Closed type hydraulic system, namely oil hydraulic pump docks by pipeline with oil hydraulic motor, forms the circulatory system of sealing, and is more to the quantity required of pump, and the pump group is arranged difficulty, and cost is higher.The utility model can be realized the operation control of the many actuators of large-tonnage crawler crane, uses the actuator of enclosed pump driving a greater number of lesser amt, and the engine power utilization ratio is higher.The other selector valve device that adopts of the utility model, simple in structure, spool is active in one's movements, applying flexible, good manufacturability, the pressure loss is little, without leaking, can satisfy large flow, the demand of high pressure.
Description of the present utility model provides for example with for the purpose of describing, and is not exhaustively or with the utility model to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present utility model and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiments with various modifications that the utility model design is suitable for special-purpose.
Claims (9)
1. the selector valve device of a hydraulic system, it is characterized in that, comprise the first control valve group, the second control valve group, pump filler opening (A11), blowback hydraulic fluid port (B11), the first filler opening (A12), the first return opening (B12), the second filler opening (A13), the second return opening (B13);
Described the first control valve group comprises: the first cartridge valve (C1), the second cartridge valve (C2), the first solenoid valve (Y101) and the first adverse current one-way valve (D1); Described the second control valve group comprises: the 3rd cartridge valve (C3), the 4th cartridge valve (C4), the second solenoid valve (Y102) and the second adverse current one-way valve (D5);
Described pump filler opening (A11), described the first cartridge valve (C1) and described the first filler opening (A12) form the first oil-feed path; Described the first return opening (B12), described the second cartridge valve (C2) and described blowback hydraulic fluid port (B11) form the first way to cycle oil; Described pump filler opening (A11), described the 3rd cartridge valve (C3) and the second filler opening (A13) form the second oil-feed path; Described the second return opening (B13), described the 4th cartridge valve (C4) and described blowback hydraulic fluid port (B11) form the second way to cycle oil;
Described the first solenoid valve (Y101) is connected with the first cartridge valve (C1), the second cartridge valve (C2) respectively; One end of described the first adverse current one-way valve (D1) is connected with the 3rd cartridge valve (C3), the 4th cartridge valve (C4) respectively, and the other end is connected on described the first oil-feed path; Described the second solenoid valve (Y102) is connected with the 3rd cartridge valve (C3), the 4th cartridge valve (C4) respectively; One end of described the second adverse current one-way valve (D5) is connected with the first cartridge valve (C1), the second cartridge valve (C2) respectively, and the other end is connected on the second oil-feed path;
Under the state that drives the first actuator, described the first solenoid valve (Y101) control described the first cartridge valve (C1) and the second cartridge valve (C2) are open-minded, make pressure oil enter described the first oil-feed path and input the first actuator, and the oil return of the first actuator is returned by described the first way to cycle oil; Pressure oil in the first oil-feed path enters the 3rd cartridge valve (C3) and the 4th cartridge valve (C4) by described the first adverse current one-way valve (D1), control the sealing of described the 3rd cartridge valve (C3) and the 4th cartridge valve (C4), disconnect described the second oil-feed path and the second way to cycle oil;
Under the state that drives the second actuator, described the second solenoid valve (Y102) control described the 3rd cartridge valve (C3) and the 4th cartridge valve (C4) are open-minded, make pressure oil enter described the second oil-feed path and input the second actuator; The oil return of the second actuator is returned by described the second way to cycle oil; Pressure oil in the second oil-feed path enters the first cartridge valve (C1) and the second cartridge valve (C2) by described the second adverse current one-way valve (D5), control the sealing of the first cartridge valve (C1) and the second cartridge valve (C2), disconnect described the first oil-feed path and the first way to cycle oil.
2. selector valve device as claimed in claim 1 is characterized in that:
At the first oil-feed path the first relief valve (Y1) is set; At the second oil-feed path the 3rd relief valve (Y3) is set.
3. selector valve device as claimed in claim 2 is characterized in that:
At the first way to cycle oil the second relief valve (Y2) is set; At the second way to cycle oil the 4th relief valve (Y4) is set.
4. selector valve device as claimed in claim 1 is characterized in that:
Described the first control valve group also comprises: the 3rd adverse current one-way valve (D2); One end of described the 3rd adverse current one-way valve (D2) is connected with the 4th cartridge valve (C4) with the 3rd cartridge valve (C3) respectively, and the other end is connected on described the first way to cycle oil;
Under the state that drives the first actuator, pressure oil in the first way to cycle oil enters the 3rd cartridge valve (C3) and the 4th cartridge valve (C4) by the 3rd adverse current one-way valve (D2), control the sealing of described the 3rd cartridge valve (C3) and the 4th cartridge valve (C4), disconnect described the second oil-feed path and the second way to cycle oil.
5. selector valve device as claimed in claim 4 is characterized in that:
Described the second control valve group also comprises: the 4th adverse current one-way valve (D6); One end of described the 4th adverse current one-way valve (6) respectively with the first cartridge valve (C1) be connected cartridge valve (C2) and be connected, the other end is connected on described the second way to cycle oil;
Under the state that drives the second actuator, pressure oil in the second way to cycle oil enters the first cartridge valve (C1) and the second cartridge valve (C2) by the 4th adverse current one-way valve (D6), control the sealing of the first cartridge valve (C1) and the second cartridge valve (C2), disconnect described the first oil-feed path and the first way to cycle oil.
6. selector valve device as claimed in claim 1 is characterized in that, described selector valve device also comprises the 5th adverse current one-way valve (D3);
One end of described the 5th adverse current one-way valve (D3) is connected with described the first oil-feed path, and the other end connects measuring cell.
7. selector valve device as claimed in claim 1 is characterized in that,
On described the first oil-feed path, the second oil-feed path, the first way to cycle oil and the second way to cycle oil, pressure-measuring point is set all; Load cell all is set on described pressure-measuring point.
8. the selector valve device shown in claim 7 is characterized in that, described selector valve device also comprises warning device;
When the oil pressure in described the first oil-feed path, the second oil-feed path, the first way to cycle oil or the second way to cycle oil during greater than the pressure threshold set, then described pressure transducer sends alarm signal to described warning device.
9. a crawler crane hydraulic system is characterized in that, comprises the selector valve device such as the described hydraulic system of claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504466 CN202851495U (en) | 2012-09-28 | 2012-09-28 | Hydraulic system valve switching device and crawler crane purpose hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504466 CN202851495U (en) | 2012-09-28 | 2012-09-28 | Hydraulic system valve switching device and crawler crane purpose hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN202851495U true CN202851495U (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220504466 Expired - Lifetime CN202851495U (en) | 2012-09-28 | 2012-09-28 | Hydraulic system valve switching device and crawler crane purpose hydraulic system |
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| CN (1) | CN202851495U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900718A (en) * | 2012-09-28 | 2013-01-30 | 徐工集团工程机械股份有限公司 | Changeover valve device for hydraulic system and hydraulic system for crawler crane |
| CN103244501A (en) * | 2013-05-14 | 2013-08-14 | 三一汽车起重机械有限公司 | Hydraulic control valve group, hydraulic system and engineering machine |
| CN103470045A (en) * | 2013-09-06 | 2013-12-25 | 三一汽车制造有限公司 | Engineering machine |
| CN108087365A (en) * | 2017-12-19 | 2018-05-29 | 宁波文泽机电技术开发有限公司 | Oil circuit automatic transfer valve |
-
2012
- 2012-09-28 CN CN 201220504466 patent/CN202851495U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900718A (en) * | 2012-09-28 | 2013-01-30 | 徐工集团工程机械股份有限公司 | Changeover valve device for hydraulic system and hydraulic system for crawler crane |
| CN103244501A (en) * | 2013-05-14 | 2013-08-14 | 三一汽车起重机械有限公司 | Hydraulic control valve group, hydraulic system and engineering machine |
| CN103470045A (en) * | 2013-09-06 | 2013-12-25 | 三一汽车制造有限公司 | Engineering machine |
| CN103470045B (en) * | 2013-09-06 | 2016-05-11 | 三一汽车制造有限公司 | A kind of engineering machinery |
| CN108087365A (en) * | 2017-12-19 | 2018-05-29 | 宁波文泽机电技术开发有限公司 | Oil circuit automatic transfer valve |
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