CN203847462U - Multi-flow control valve, chassis support leg hydraulic control system and crane - Google Patents
Multi-flow control valve, chassis support leg hydraulic control system and crane Download PDFInfo
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- CN203847462U CN203847462U CN201420182977.5U CN201420182977U CN203847462U CN 203847462 U CN203847462 U CN 203847462U CN 201420182977 U CN201420182977 U CN 201420182977U CN 203847462 U CN203847462 U CN 203847462U
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- 238000001914 filtration Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 79
- 239000012530 fluid Substances 0.000 description 7
- 238000011109 contamination Methods 0.000 description 5
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- 238000003754 machining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000002828 fuel tank Substances 0.000 description 1
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Abstract
The utility model relates to a multi-flow control valve, a chassis support leg hydraulic control system and a crane. The multi-flow control valve comprises a valve body and at least a switching value control valve, wherein the valve body comprises a valve body oil inlet and at least two valve body working oil ports corresponding to loads with different flow needs; the oil inlet of at least one switching value control valve is communicated with the valve body oil inlet, and the working oil port of at least one switching value control valve is communicated with at least two valve body working oil port of the at least one switching value control valve so as to form at lest two working oil channels corresponding to the loads with different flow needs; each working oil channel is also provided with a throttling port with the drift diameter corresponding to a flow demand. Compared with the control mode of an existing proportional reversing valve, the multi-flow control valve is low in cost as the flow is mainly determined by the drift diameter of the throttling port of the valve body and the precision requirement on the switching value control valve per se is relatively low, and is higher in reliability as the switching value control valve is relatively low in oil liquid pollution sensitivity and strong in anti-pollution capacity.
Description
Technical field
The utility model relates to engineering machinery field, relates in particular to a kind of various flow control valve, chassis support leg hydraulic control system and hoist.
Background technique
In crane chassis supporting leg hydraulic system, executive component has many kinds of liquid compressing cylinder, the hydraulic jack that some parameter is close can adopt a kind of flow control, also there are some hydraulic jack traffic demands to be different from other hydraulic jacks, such as traffic demand plugging pin oil cylinder less than normal etc., if only adopt the switching value of single oil pump to control, can have problems.
Current solution is to utilize variable displacement pump to connect proportional reversing valve, utilizes the size of current that offers proportional reversing valve to regulate the flow that enters load.As shown in Figure 1, for existing a kind of adoption rate is controlled the hydraulic schematic diagram that two-flow variable pump systems carries out the solution of crane chassis supporting leg hydraulic control.In Fig. 1, load sensitive pump a1 drives whole system, and one-way valve a2 prevents that fluid refluence from causing damage to pump.Relief valve a3 carries out pressure protect to hydraulic system, anti-locking system overload.Proportional reversing valve a4 regulates entering the flow of load, realizes the difference of the stretching speed of different oil cylinders.Supporting leg control valve a5 is solenoid valve, and it controls the action of oscillating oil cylinder a10, cross cylinder a11, Vertical Cylinders a12.One-way hydraulic lock a6 guarantees the Security of hoisting process complete machine, and one way sequence valve a7 guarantees that Vertical Cylinders a12 stretches out easy motion in process.Plugging pin oil cylinder control valve a8 is used for controlling stretching out and retracting of plugging pin oil cylinder a13.Return filter a9 is used for oil return to filter.
Oscillating oil cylinder a10, cross cylinder a11, the required flow of Vertical Cylinders a12 are basic identical, plugging pin oil cylinder a12 is because cylinder diameter is less, required flow is also very little, and the restriction in the adjusting passing ratio selector valve a4 of its flow carries out ratio adjusting, realizes different loading speed requirements.
There is the problem of many aspects in this current solution: be first that proportional reversing valve a4 cost is high, reliability is poor, comparatively responsive to oil contamination; Next is that load-sensitive control hydraulic system is high to the sensitivity level of load variations, fast to the governing response speed of load variations, but in actual applications, regulation output power may have influence on the operating life of machine too frequently; Be finally that the control of valve latus rectum is limited by the impacts such as the stagnant ring of proportional reversing valve, repeatability, have certain inexactness.
Model utility content
The purpose of this utility model is to propose a kind of various flow control valve, chassis support leg hydraulic control system and hoist, can reduce costs, and improves reliability.
For achieving the above object, the utility model provides a kind of various flow control valve, comprise valve body and at least one switching value control valve, described valve body comprises valve body filler opening and at least two valve body actuator ports corresponding with the load of different flow demand, the filler opening of described at least one switching value control valve communicates with described valve body filler opening, the actuator port of described at least one switching value control valve communicates with at least two valve body actuator ports of described valve body, form at least two work oil ducts corresponding with the load of different flow demand, on every work oil duct, be also provided with the restriction that latus rectum is corresponding with traffic demand.
Further, also comprise that pressure ratio is compared with mechanism, described valve body also comprises load-sensitive delivery outlet, described in described pressure ratio is arranged on compared with mechanism at least two work oil ducts corresponding with the load of different flow demand, and filters out the valve body actuator port that in each valve body actuator port, pressure is the highest and communicate with described load-sensitive delivery outlet.
Further, described pressure ratio is shuttle valve or shuttle valve network compared with mechanism.
Further, also comprise relief valve, described valve body also comprises valve body return opening, and the filler opening of described relief valve and return opening communicate with described valve body filler opening and described valve body return opening respectively.
Further, described switching value control valve is solenoid directional control valve.
Further, the latus rectum of described restriction is calculated and is obtained by pressure reduction before and after corresponding traffic demand, flow coefficient and described restriction.
For achieving the above object, the utility model provides a kind of chassis support leg hydraulic control system, comprise load sensitive pump, the executive component of at least two kinds of traffic demands and corresponding control valve, wherein, also comprise aforesaid various flow control valve, the oil outlet of described load sensitive pump communicates with the valve body filler opening of described various flow control valve, the valve body actuator port that the load-sensitive control mouth of described load sensitive pump is the highest with the pressure filtering out in each valve body actuator port of described various flow control valve communicates, each valve body actuator port of described various flow control valve is connected with the executive component of corresponding traffic demand and corresponding control valve respectively.
Further, described executive component comprises oscillating oil cylinder, cross cylinder and Vertical Cylinders, and corresponding to same traffic demand, described executive component also comprises plugging pin oil cylinder, corresponding to the traffic demand different from described oscillating oil cylinder, cross cylinder and Vertical Cylinders.
Further, the traffic demand that described oscillating oil cylinder, cross cylinder and Vertical Cylinders are corresponding is greater than traffic demand corresponding to described plugging pin oil cylinder, and the latus rectum of the restriction on work oil duct corresponding to described oscillating oil cylinder, cross cylinder and Vertical Cylinders is greater than the latus rectum of the restriction on work oil duct corresponding to described plugging pin oil cylinder.
For achieving the above object, the utility model provides a kind of hoist, wherein, comprises aforesaid chassis support leg hydraulic control system.
Based on technique scheme, various flow control valve of the present utility model carries out switch control by switching value control valve to many work oil ducts with the restriction that latus rectum is corresponding with traffic demand in valve body, realize the pressure oil supply of the executive component of different flow demand, the executive component of different flow demand can select the work oil duct that applicable restriction latus rectum is corresponding to connect, control mode than existing proportional reversing valve, the utility model is because flow is mainly determined by the restriction latus rectum of valve body, the precision prescribed of switch amount control valve itself is lower, therefore cost is lower, and switching value control valve is lower to oil contamination susceptibility, contamination resistance is strong, therefore reliability is higher.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is that existing a kind of adoption rate is controlled the hydraulic schematic diagram that two-flow variable pump systems carries out the solution of crane chassis supporting leg hydraulic control.
Fig. 2 is an embodiment's of the utility model various flow control valve structural representation.
Fig. 3 is another embodiment's of the utility model various flow control valve structural representation.
Fig. 4 is the another embodiment's of the utility model various flow control valve structural representation.
Fig. 5 is an embodiment's of the utility model chassis support leg hydraulic control system structural representation.
Embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Existing proportional reversing valve is being undertaken the effect aspect two in load sensitive system, it is on the one hand the switching of supply fluid of the executive component of different flow demand, be that valve latus rectum is controlled on the other hand, make the fluid flow of passing ratio selector valve meet the demand of corresponding executive component.But also analyzed proportional reversing valve self above and there is the problems such as cost is high, poor reliability, latus rectum control inaccuracy.
For these problems, inventor acts on this two aspect in various flow control valve and realizes by different elements, the problem of being brought to eliminate proportional reversing valve self-defect.Supply fluid switching problem for different executive components, can adopt switching value control valve to realize, and latus rectum is controlled and can be realized by the restriction in valve body.At various flow control valve of the present utility model, comprise valve body and at least one switching value control valve, and valve body comprises valve body filler opening and at least two valve body actuator ports corresponding with the load of different flow demand, the filler opening of at least one switching value control valve communicates with filler opening, the actuator port of at least one switching value control valve communicates with at least two valve body actuator ports of valve body, form at least two work oil ducts corresponding with the load of different flow demand, on every work oil duct, be also provided with the restriction that latus rectum is corresponding with traffic demand.
Relation between traffic demand and latus rectum is followed the flow formula of thin wall small hole, as follows:
Wherein, Q is the flow by aperture, and C is flow coefficient, and A is aperture flow area, and Δ p is the pressure reduction before and after aperture.In this formula, C is definite value.The flow Q that restriction (or claim thin wall small hole) passes through is directly proportional to flow area A, is directly proportional to the square root of the pressure differential deltap p of aperture front and back.According to this relation, if can determine the traffic demand of pressure reduction before and after restriction and corresponding executive component, add the flow coefficient of definite value and can determine the latus rectum value that restriction should be designed to.
As shown in Figure 2, be an embodiment's of the utility model various flow control valve structural representation.In the present embodiment, in valve body 11, be provided with two switching value control valves, be respectively solenoid directional control valve 12 and solenoid directional control valve 13, the filler opening of solenoid directional control valve 12 and solenoid directional control valve 13 all communicates with valve body oil inlet P, and the actuator port of solenoid directional control valve 12 and solenoid directional control valve 13 respectively with two valve body actuator port A of valve body 11, B communicates, valve body actuator port A, B can be access to respectively the load of different flow demand, and the actuator port of solenoid directional control valve 12 and solenoid directional control valve 13 respectively with two valve body actuator port A of valve body 11, between B, can form two corresponding work oil ducts, on two work oil ducts, be also respectively equipped with the restriction 14 that latus rectum is corresponding with traffic demand, 15.
Switching value control valve is than proportional reversing valve, and simpler on manufacturing, machining accuracy will require low, even if therefore used a plurality of switching value control valves, does not still need higher cost.On the other hand, switching value control valve is stronger compared with the contamination resistance of proportional reversing valve, and reliability is higher.
As shown in Figure 3, be another embodiment's of the utility model various flow control valve structural representation.Compare with a upper embodiment, the present embodiment has increased pressure ratio compared with mechanism, wherein valve body 11 also comprises load-sensitive delivery outlet LS, pressure ratio is arranged at least two work oil ducts corresponding with the load of different flow demand compared with mechanism, and filters out the valve body actuator port that in each valve body actuator port, pressure is the highest and communicate with load-sensitive delivery outlet LS.Load-sensitive delivery outlet LS can send to LS pressure signal the feedback hydraulic fluid port of load sensitive pump, thereby realizes the control of pump duty.
Pressure ratio can adopt the shuttle valve 16 shown in Fig. 3 compared with mechanism, also can adopt the shuttle valve network being formed by shuttle valve 16 and shuttle valve 10 shown in Fig. 4 embodiment, any pressure ratio that can realize the oil duct of respectively working and the existing mechanism that exports to the feedback hydraulic fluid port of load sensitive pump all can be applied to, in the utility model various flow control valve, give an example no longer one by one here.
In various flow control valve shown in Fig. 4, there are three switching value control valves, on the basis of Fig. 3, increased solenoid directional control valve 18, and on the work oil duct of these solenoid directional control valve 18 correspondences, be provided with restriction 19, and leading to valve body actuator port C, shuttle valve network can be selected the pressure signal that pressure is the highest and feed back to load sensitive pump as LS pressure signal from actuator port A, B, C.
In a further embodiment, can corresponding work oil duct and restriction be set according to the quantity of the different flow demand of executive component, for example in load sensitive system, there is the executive component of four kinds of traffic demands, every kind of traffic demand may corresponding at least one executive component, and four work oil ducts and restriction latus rectums corresponding with these four kinds of traffic demands respectively so just can be set in various flow control valve.In the selection of switching value control valve, can adopt the bi-bit bi-pass solenoid directional control valve shown in Fig. 2-Fig. 4, also can adopt mechanical commutation valve, or in Fig. 2, two bi-bit bi-pass solenoid directional control valves are replaced by two position, three-way electromagnetic change valve etc.
In the embodiment of above-mentioned lifted various flow control valve; for the pressure to pump discharge is protected; can a nearly step increase relief valve 17; the filler opening of relief valve 17 and return opening communicate with valve body oil inlet P and valve body oil return inlet T respectively; if the overpressure of relief valve 17 entrances, can make unnecessary fluid flow back to fuel tank by relief valve.
Above-mentioned various flow control valve of the present utility model can be widely used in all kinds of engineering hydraulic control systems, below take chassis support leg hydraulic control system as example, and once implementation and the function of various flow control valve are described.As shown in Figure 5, be an embodiment's of the utility model chassis support leg hydraulic control system structural representation.In the present embodiment, chassis support leg hydraulic control system comprises load sensitive pump 2, the executive component of at least two kinds of traffic demands and corresponding control valve, also comprise foregoing various flow control valve 1, the oil outlet B of load sensitive pump 2 communicates with the valve body oil inlet P of various flow control valve 1, it (is to select by shuttle valve in the present embodiment that the valve body actuator port that the load-sensitive control mouthful LS1 of load sensitive pump 2 is the highest with the pressure filtering out in each valve body actuator port of various flow control valve 1 communicates, and by load-sensitive delivery outlet LS, export to load-sensitive and control a mouthful LS1), each valve body actuator port of various flow control valve 1 (for example swings with the executive component of corresponding traffic demand respectively, cross cylinder, Vertical Cylinders, plugging pin oil cylinder etc.) and corresponding control valve (for example support leg valve 5, one-way hydraulic lock 6, one way sequence valve 7, plugging pin oil cylinder control valve 8 etc.) be connected.
In the present embodiment, adopted the structural type of the various flow control valve shown in Fig. 3, in fact in other the embodiment of chassis support leg hydraulic control system, also can adopt other structural types of enumerating above, and can corresponding hydraulic control parts be set outside various flow control valve as required and realize its function, describe in detail no longer one by one here.
In the chassis support leg hydraulic control system of the present embodiment, executive component comprises oscillating oil cylinder, cross cylinder and Vertical Cylinders, although these three kinds of oil cylinders belong to different executive components, but corresponding to same traffic demand, therefore can be only corresponding to a work oil duct of various flow control valve, therefore and another kind of executive component is plugging pin oil cylinder, corresponding to the traffic demand different from oscillating oil cylinder, cross cylinder and Vertical Cylinders, corresponding to another work oil duct of various flow control valve.
As a rule, the traffic demand that oscillating oil cylinder, cross cylinder and Vertical Cylinders are corresponding is greater than traffic demand corresponding to plugging pin oil cylinder, so the latus rectum of the restriction on work oil duct corresponding to oscillating oil cylinder, cross cylinder and Vertical Cylinders is greater than the latus rectum of the restriction on work oil duct corresponding to plugging pin oil cylinder.For other engineering equipment hydraulic control system or another kind of chassis support leg hydraulic control system, also may there is the magnitude relationship situation different from the present embodiment of demand volume, only need flow according to the actual requirements to carry out design and the selection of the restriction latus rectum of various flow control valve.
In chassis support leg hydraulic control system, also have return filter 9, for the hydraulic oil of convection current oil sump tank, filter.In various flow control valve 1, pressure tap 3 can also be set, the pressure at valve body oil inlet P place is monitored.Between the load-sensitive delivery outlet LS of valve body and the load-sensitive of load sensitive pump 2 control mouthful LS1, damping hole 4 can also be set.In band spring one side of the load-sensitive spool of load sensitive pump 2, be communicated with load-sensitive and control a mouthful LS1, opposite side B1 is communicated with the oil outlet B of load sensitive pump 2.
Before mention, according to the flow formula of thin wall small hole, if can determine the traffic demand of pressure reduction before and after restriction and corresponding executive component, add the flow coefficient of definite value and can determine the latus rectum value that restriction should be designed to.For the present embodiment, the B1 of the load-sensitive spool of load sensitive pump and the LS1 of load-sensitive spool roughly analyze from equilibrium of forces angle, can draw P
b1=P
lS1+ P
spring, P wherein
b1for the pressure at B1 place, P
lS1for the pressure at LS1 place, and P
springthe pressure of load-sensitive spool spring chamber.That is to say, the pressure that Δ p is spring, supposes that spring is in compared with short stroke, and rigidity is constant, and Δ p is exactly a definite value so, from formula, can find out, flow Q now is only directly proportional to flow area A.This has just further simplified the design of flow area A of the restriction of various flow control valve.
Chassis support leg hydraulic control system embodiment based on shown in Fig. 5, describes its working procedure below.The high-voltage oil liquid of load sensitive pump 2 oil outlet B enters in various flow control valve 1 by the valve body oil inlet P of various flow control valve 1, and the relief valve in various flow control valve 1 17 is protected.All must not electricity when (being not operation of load) when solenoid directional control valve 12,13, corresponding work oil duct is all closed, and the pressure of valve body actuator port A, B is zero, and the pressure of the load-sensitive delivery outlet LS through shuttle valve 16 after is relatively also zero.Because LS meets the LS1 of load sensitive pump 2, therefore load sensitive pump 2 is also responded to the demand less than load, the oil outlet B of load sensitive pump 2 is with the internal leakage requirement of very low pressure maintenance system.
When oscillating oil cylinder (or cross cylinder, Vertical Cylinders) needs operation, supporting leg control valve 5 obtains electric, solenoid directional control valve 12 obtains electric simultaneously, pressure oil liquid is divided into two-way through valve body oil inlet P, solenoid directional control valve 12, restriction 14, the valve body actuator port A of leading up to flows to oscillating oil cylinder (or cross cylinder, Vertical Cylinders), pressure ratio is carried out through shuttle valve 16 and another work oil duct in another road, then by load-sensitive delivery outlet LS, output to a load-sensitive control mouthful LS1 for load sensitive pump 2, by load sensitive pump 2 inductive loads, provide required working pressure; When plugging pin oil cylinder needs operation, plugging pin oil cylinder control valve 8 obtains electric, solenoid directional control valve 13 obtains electric simultaneously, pressure oil liquid is divided into two-way through valve body oil inlet P, solenoid directional control valve 13, restriction 15, the valve body actuator port B of leading up to flows to plugging pin oil cylinder, pressure ratio is carried out through shuttle valve 16 and another work oil duct in another road, then by load-sensitive delivery outlet LS, outputs to a load-sensitive control mouthful LS1 for load sensitive pump 2, by load sensitive pump 2 inductive loads, provides required working pressure.
Chassis support leg hydraulic control system of the present utility model is applicable to all kinds of engineering machinery, is especially applicable to being applied in hoist, can reduce costs, and improves reliability.
By the explanation to each embodiment of the utility model various flow control valve, chassis support leg hydraulic control system and hoist above, the utility model is controlled solution than existing two-flow demand variable pump and at least one of is had the following advantages:
1, in the situation that realizing equally same two-flow control target, because the manufacture of switching value control valve is simple, requirement on machining accuracy is not high, therefore compares with proportional reversing valve requirement on machining accuracy is high, and cost is cheaper.
2, switching value control structure is simple, and stronger compared with ratio control system contamination resistance, and reliability is higher.
3, pressure one tunnel of oil pump outlet enters load, the load-sensitive that relatively larger pressure signal fed back to oil pump of separately leading up to is controlled mouthful, owing to adopting the fixedly restriction of latus rectum, corresponding restriction outlet pressure fluctuation is less, the reduction of adjusting frequency back and forth of the spool of oil pump induction, therefore the corresponding prolongation of oil cylinder life-span.
4, be not limited to the load of two kinds of traffic demands, for the load of more kinds of traffic demands, only need to increase the quantity of work oil duct and the switching value control valve with restriction.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement embodiment of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope that the utility model asks for protection.
Claims (10)
1. a various flow control valve, it is characterized in that, comprise valve body and at least one switching value control valve, described valve body comprises valve body filler opening and at least two valve body actuator ports corresponding with the load of different flow demand, the filler opening of described at least one switching value control valve communicates with described valve body filler opening, the actuator port of described at least one switching value control valve communicates with at least two valve body actuator ports of described valve body, form at least two work oil ducts corresponding with the load of different flow demand, on every work oil duct, be also provided with the restriction that latus rectum is corresponding with traffic demand.
2. various flow control valve according to claim 1, it is characterized in that, also comprise that pressure ratio is compared with mechanism, described valve body also comprises load-sensitive delivery outlet, described in described pressure ratio is arranged on compared with mechanism at least two work oil ducts corresponding with the load of different flow demand, and filters out the valve body actuator port that in each valve body actuator port, pressure is the highest and communicate with described load-sensitive delivery outlet.
3. various flow control valve according to claim 2, is characterized in that, described pressure ratio is shuttle valve or shuttle valve network compared with mechanism.
4. according to the various flow control valve described in claim 2 or 3, it is characterized in that, also comprise relief valve, described valve body also comprises valve body return opening, and the filler opening of described relief valve and return opening communicate with described valve body filler opening and described valve body return opening respectively.
5. various flow control valve according to claim 1, is characterized in that, described switching value control valve is solenoid directional control valve.
6. various flow control valve according to claim 1, is characterized in that, the latus rectum of described restriction is calculated and obtained by pressure reduction before and after corresponding traffic demand, flow coefficient and described restriction.
7. a chassis support leg hydraulic control system, comprise load sensitive pump, the executive component of at least two kinds of traffic demands and corresponding control valve, it is characterized in that, also comprise the arbitrary described various flow control valve of claim 1～6, the oil outlet of described load sensitive pump communicates with the valve body filler opening of described various flow control valve, the valve body actuator port that the load-sensitive control mouth of described load sensitive pump is the highest with the pressure filtering out in each valve body actuator port of described various flow control valve communicates, each valve body actuator port of described various flow control valve is connected with the executive component of corresponding traffic demand and corresponding control valve respectively.
8. chassis support leg hydraulic control system according to claim 7, it is characterized in that, described executive component comprises oscillating oil cylinder, cross cylinder and Vertical Cylinders, corresponding to same traffic demand, described executive component also comprises plugging pin oil cylinder, corresponding to the traffic demand different from described oscillating oil cylinder, cross cylinder and Vertical Cylinders.
9. chassis support leg hydraulic control system according to claim 8, it is characterized in that, the traffic demand that described oscillating oil cylinder, cross cylinder and Vertical Cylinders are corresponding is greater than traffic demand corresponding to described plugging pin oil cylinder, and the latus rectum of the restriction on work oil duct corresponding to described oscillating oil cylinder, cross cylinder and Vertical Cylinders is greater than the latus rectum of the restriction on work oil duct corresponding to described plugging pin oil cylinder.
10. a hoist, is characterized in that, comprises the arbitrary described chassis support leg hydraulic control system of claim 7～9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420182977.5U CN203847462U (en) | 2014-04-15 | 2014-04-15 | Multi-flow control valve, chassis support leg hydraulic control system and crane |
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| CN201420182977.5U CN203847462U (en) | 2014-04-15 | 2014-04-15 | Multi-flow control valve, chassis support leg hydraulic control system and crane |
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| CN201420182977.5U Expired - Lifetime CN203847462U (en) | 2014-04-15 | 2014-04-15 | Multi-flow control valve, chassis support leg hydraulic control system and crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939407A (en) * | 2014-04-15 | 2014-07-23 | 徐州重型机械有限公司 | Multi-flow control valve, chassis supporting leg hydraulic control system and crane |
| CN109441900A (en) * | 2018-12-10 | 2019-03-08 | 扬州盛达特种车有限公司 | A kind of energy-saving hydraulic system of pavement cleaning vehicle |
-
2014
- 2014-04-15 CN CN201420182977.5U patent/CN203847462U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939407A (en) * | 2014-04-15 | 2014-07-23 | 徐州重型机械有限公司 | Multi-flow control valve, chassis supporting leg hydraulic control system and crane |
| CN109441900A (en) * | 2018-12-10 | 2019-03-08 | 扬州盛达特种车有限公司 | A kind of energy-saving hydraulic system of pavement cleaning vehicle |
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