CN103010069B - For the electrohydraulic control system of bucket crane - Google Patents
For the electrohydraulic control system of bucket crane Download PDFInfo
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- CN103010069B CN103010069B CN201110282891.0A CN201110282891A CN103010069B CN 103010069 B CN103010069 B CN 103010069B CN 201110282891 A CN201110282891 A CN 201110282891A CN 103010069 B CN103010069 B CN 103010069B
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- 239000002828 fuel tank Substances 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 302
- 230000000694 effects Effects 0.000 description 9
- 239000010720 hydraulic oil Substances 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The present invention relates to a kind of electrohydraulic control system for bucket crane, it comprises fuel tank, fix-displacement pump, three-way pressure compensating device, safety valve, reducing valve, four threeway solenoid-operated proportional reducing valves, two pilot operated directional control valves, four threeway proportional pressure-reducing valves, two balance cocks, seven shuttle valves, two moved arm lifting oil cylinders, two support oil cylinders, two hook oil cylinders and hydraulic control one-way valves; The entrance of fix-displacement pump connects fuel tank oil outlet, the oil inlet of the oil inlet of the oil inlet of quantitative delivery side of pump difference connecting tee pressure compensator, the oil inlet of reducing valve, the first threeway solenoid-operated proportional reducing valve, the oil inlet of the second threeway solenoid-operated proportional reducing valve, the 3rd threeway solenoid-operated proportional reducing valve, the oil inlet of the 4th threeway solenoid-operated proportional reducing valve, the oil inlet of the first pilot operated directional control valve and the oil inlet of the second pilot operated directional control valve; The present invention is easy for installation, reduces connecting line, reduces leakage of oil, and mechanical is worn and torn, antijamming capability is strong, simple to operate, non-maintaining.
Description
Technical field
The present invention relates to a kind of electrohydraulic control system, specifically for the electrohydraulic control system of bucket crane.
Background technology
Bucket crane is the special-use vehicle of the material transportation such as waste material, sheet material crop being specifically designed to all kinds of iron and steel material quality in iron and steel enterprise, and bucket crane is made up of upper dress equipment and chassis two parts.Feed hopper, with the use of carrying out transported material, is hung on car body platform from ground by the fluid pressure drive device of self, or is hung onto on ground from car body platform by feed hopper by bucket crane and feed hopper, and the self-unloading function of material.
There is moved arm lifting oil cylinder bucket crane both sides, the action of moved arm lifting oil cylinder makes swing arm entablatrance circle, motion of translation is circled by four chain-driving feed hoppers of its end, carry out the lifting of feed hopper and transfer, when feed hopper will be transferred, link up with and throw off automatically under oil cylinder effect.When tumbling feed hopper, hook and do not put, feed hopper does circumference flip-flop movement centered by namely can linking up with, and completes material self-unloading.
Existing bucket crane all adopts hydraulic-driven, and the power of hydraulic efficiency pressure system is all from engine in situ, and power is passed to Hydraulic Pump through change speed gear box and power takeoff.The high pressure oil that Hydraulic Pump exports, after various fluid control valve, drives each oil cylinder, promotes load and realizes various action.
In order to control the kinematic velocity of each oil cylinder, common hydraulic efficiency pressure system mostly adopts the mode of entrance throttle governing circuit, which requires that the by pass valve of system must be always in running order, cause pump to be operated in the high pressure conditions of by pass valve setting always, and unnecessary flow under high pressure must overflow back fuel tank by by pass valve, the energy causing hydraulic efficiency pressure system unnecessary is all converted into heat energy, and system cal val is very large, and the temperature of hydraulic oil rises very fast.And analysis of hydraulic oil overheat, hydraulic efficiency pressure system can be made to produce problems such as leakage of oil, power element speed are slow, wearing and tearing aggravation, rubber seal accelerated weathering.
Common bucket crane generally adopts mechanical flexible axle to control the action of change-over valve simultaneously, and this mode is installed, it is all not too convenient to use, and the installing space taken is comparatively large, and operational torque is also comparatively large, and after using a period of time, flexible axle there will be the phenomenon of wearing and tearing, clamping stagnation simultaneously.Make troubles to the use technology of bucket crane.
Summary of the invention
The present invention is intended to the defect overcoming prior art, provides a kind of electrohydraulic control system for bucket crane, easy for installation, reduces connecting line, reduces leakage of oil, and mechanical is worn and torn, antijamming capability is strong, simple to operate, non-maintaining.
In order to solve the problems of the technologies described above, the present invention is achieved in that
For an electrohydraulic control system for bucket crane, it is characterized in that: it comprises fuel tank, fix-displacement pump, three-way pressure compensating device, safety valve, reducing valve, four threeway solenoid-operated proportional reducing valves, two pilot operated directional control valves, four threeway proportional pressure-reducing valves, two balance cocks, seven shuttle valves, two moved arm lifting oil cylinders, two support oil cylinders, two hook oil cylinders and hydraulic control one-way valves;
The entrance of fix-displacement pump connects fuel tank oil outlet, the oil inlet of the oil inlet of the oil inlet of quantitative delivery side of pump difference connecting tee pressure compensator, the oil inlet of reducing valve, the first threeway solenoid-operated proportional reducing valve, the oil inlet of the second threeway solenoid-operated proportional reducing valve, the 3rd threeway solenoid-operated proportional reducing valve, the oil inlet of the 4th threeway solenoid-operated proportional reducing valve, the oil inlet of the first pilot operated directional control valve and the oil inlet of the second pilot operated directional control valve;
The oil outlet of the first threeway solenoid-operated proportional reducing valve connects the first oil inlet of the first shuttle valve, the oil outlet of the second threeway solenoid-operated proportional reducing valve connects the first oil inlet of the second shuttle valve, the oil outlet of the 3rd threeway solenoid-operated proportional reducing valve connects the first oil inlet of the 3rd shuttle valve, the oil outlet of the 4th threeway solenoid-operated proportional reducing valve connects the first oil inlet of the 4th shuttle valve, the return opening of the first threeway solenoid-operated proportional reducing valve, the return opening of the second threeway solenoid-operated proportional reducing valve, the return opening of the 3rd threeway solenoid-operated proportional reducing valve and the return opening of the 4th threeway solenoid-operated proportional reducing valve are parallel-connected to the first return opening of fuel tank,
Second oil inlet of the first shuttle valve connects the oil outlet of the first threeway proportional pressure-reducing valve, and the oil outlet of the first shuttle valve connects the left side commutation control mouth of the first pilot operated directional control valve;
Second oil inlet of the second shuttle valve connects the oil outlet of the second threeway proportional pressure-reducing valve, and the oil outlet of the second shuttle valve connects the right side commutation control mouth of the first pilot operated directional control valve;
Second oil inlet of the 3rd shuttle valve connects the oil outlet of the 3rd threeway proportional pressure-reducing valve, and the oil outlet of the 3rd shuttle valve connects the left side commutation control mouth of the second pilot operated directional control valve;
Second oil inlet of the 4th shuttle valve connects the oil outlet of the 4th threeway proportional pressure-reducing valve, and the oil outlet of the 4th shuttle valve connects the right side commutation control mouth of the second pilot operated directional control valve;
The oil inlet of the first threeway proportional pressure-reducing valve, the oil inlet of the second threeway proportional pressure-reducing valve, the oil inlet of the 3rd threeway proportional pressure-reducing valve and the oil inlet of the 4th threeway proportional pressure-reducing valve are parallel-connected to the oil outlet of reducing valve, and the return opening of the first threeway proportional pressure-reducing valve, the return opening of the second threeway proportional pressure-reducing valve, the return opening of the 3rd threeway proportional pressure-reducing valve and the return opening of the 4th threeway proportional pressure-reducing valve are parallel-connected to the first return opening of fuel tank;
The outer drain tap of reducing valve is connected to the first return opening of fuel tank;
First load communication port of the first pilot operated directional control valve connects the second oil inlet of the 5th shuttle valve and the oil inlet of the first balance cock respectively, second load communication port of the first pilot operated directional control valve connects the first oil inlet of the 5th shuttle valve and the oil inlet of the second balance cock respectively, and the return opening of the first pilot operated directional control valve connects the second return opening of fuel tank;
First load communication port of the second pilot operated directional control valve connects the second oil inlet of the 6th shuttle valve, the first hook oil cylinder and the second hook oil cylinder, the first support oil cylinder and the second support oil cylinder respectively, second load communication port of the second pilot operated directional control valve connects the first oil inlet of the 6th shuttle valve, the first hook oil cylinder and the second hook oil cylinder, the first support oil cylinder and the second support oil cylinder respectively, and the return opening of the second pilot operated directional control valve connects the second return opening of fuel tank;
The oil outlet of the 5th shuttle valve connects the second oil inlet of the 7th shuttle valve, and the oil outlet of the 6th shuttle valve connects the first oil inlet of the 7th shuttle valve, the oil outlet feedback signal mouth of connecting tee pressure compensator and the oil inlet of safety valve respectively of the 7th shuttle valve;
The return opening of three-way pressure compensating device and the oil outlet of safety valve are connected in parallel the second return opening of fuel tank;
The oil outlet of the first balance cock and the oil outlet of the second balance cock are connected the first moved arm lifting oil cylinder and the second moved arm lifting oil cylinder respectively, the outside control mouth of the first balance cock connects the oil inlet of the second balance cock, and the outside control mouth of the second balance cock connects the oil inlet of the first balance cock.
The described electrohydraulic control system for bucket crane, it is characterized in that: the first load communication port of the second pilot operated directional control valve directly arrives the first hook oil cylinder and the second hook oil cylinder, the second load communication port of the second pilot operated directional control valve arrives the first hook oil cylinder and the second hook oil cylinder by hydraulic control one-way valve.
The invention has the beneficial effects as follows: adopt electrical-liquid control mode, reduce the cal val of hydraulic efficiency pressure system, reduce the power dissipation of driving engine, adopt inserted valve integrated oil path block, installation dimension is little, realizes the connection directly from integrated package to oil cylinder, reduces connecting line, reduces leakage of oil, the present invention is easy for installation, and mechanical wearing and tearing, antijamming capability be strong, reduce oil consumption, energy-conservation, simple to operate, non-maintaining.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
As shown in Figure 1: a kind of electrohydraulic control system for bucket crane, it comprises fuel tank 15, fix-displacement pump 1, three-way pressure compensating device 2, safety valve 3, reducing valve 4, four threeway solenoid-operated proportional reducing valve 5A, 5B, 5C, 5D, two pilot operated directional control valves, 6,7, four threeway proportional pressure-reducing valve 8A, 8B, 8C, 8D, two balance cock 9A, 9B, seven shuttle valve 10A, 10B, 10C, 10D, 10E, 10F, 10G, two moved arm lifting oil cylinder 11A, 11B, two support oil cylinder 12A, 12B, two hook oil cylinder 13A, 13B and hydraulic control one-way valves 14;
The entrance of fix-displacement pump 1 connects fuel tank 15 oil outlet 3, and the outlet of fix-displacement pump 1 is the oil inlet 2 of oil inlet 2, the second threeway solenoid-operated proportional reducing valve 5B of the oil inlet 21 of connecting tee pressure compensator 2, oil inlet 42, the first threeway solenoid-operated proportional reducing valve 5A of reducing valve 4, the oil inlet 2 of the 3rd threeway solenoid-operated proportional reducing valve 5C, the oil inlet 63 of oil inlet 2, first pilot operated directional control valve 6 of the 4th threeway solenoid-operated proportional reducing valve 5D and the oil inlet 73 of the second pilot operated directional control valve 7 respectively;
The oil outlet 1 of the first threeway solenoid-operated proportional reducing valve 5A connects first oil inlet 3 of the first shuttle valve 10D, the oil outlet 1 of the second threeway solenoid-operated proportional reducing valve 5B connects first oil inlet 3 of the second shuttle valve 10E, the oil outlet 1 of the 3rd threeway solenoid-operated proportional reducing valve 5C connects first oil inlet 3 of the 3rd shuttle valve 10F, the oil outlet 1 of the 4th threeway solenoid-operated proportional reducing valve 5D connects first oil inlet 3 of the 4th shuttle valve 10G, the return opening 3 of the first threeway solenoid-operated proportional reducing valve 5A, the return opening 3 of the second threeway solenoid-operated proportional reducing valve 5B, the return opening 3 of the 3rd threeway solenoid-operated proportional reducing valve 5C and the return opening 3 of the 4th threeway solenoid-operated proportional reducing valve 5D are parallel-connected to the first return opening 1 of fuel tank 15,
The oil outlet 2 that second oil inlet 1 of the first shuttle valve 10D connects oil outlet 2, the first shuttle valve 10D of the first threeway proportional pressure-reducing valve 8A connects the left side commutation control mouth 65 of the first pilot operated directional control valve 6;
The oil outlet 2 that second oil inlet 1 of the second shuttle valve 10E connects oil outlet 2, the second shuttle valve 10E of the second threeway proportional pressure-reducing valve 8B connects the right side commutation control mouth 66 of the first pilot operated directional control valve 6;
The oil outlet 2 that second oil inlet 1 of the 3rd shuttle valve 10F connects oil outlet the 2, three shuttle valve 10F of the 3rd threeway proportional pressure-reducing valve 8C connects the left side commutation control mouth 75 of the second pilot operated directional control valve 7;
The oil outlet 2 that second oil inlet 1 of the 4th shuttle valve 10G connects oil outlet the 2, four shuttle valve 10G of the 4th threeway proportional pressure-reducing valve 8D connects the right side commutation control mouth 76 of the second pilot operated directional control valve 7;
The return opening 2 that the oil inlet 3 of the oil inlet 3 of oil inlet 3, second threeway proportional pressure-reducing valve 8B of the first threeway proportional pressure-reducing valve 8A, the oil inlet 3 of the 3rd threeway proportional pressure-reducing valve 8C and the 4th threeway proportional pressure-reducing valve 8D is parallel-connected to the return opening 2 of return opening 1, second threeway proportional pressure-reducing valve 8B of oil outlet 41, the first threeway proportional pressure-reducing valve 8A of reducing valve 4, the return opening 1 of the 3rd threeway proportional pressure-reducing valve 8C and the 4th threeway proportional pressure-reducing valve 8D is parallel-connected to the first return opening 1 of fuel tank 15;
The outer drain tap 43 of reducing valve 4 is connected to the first return opening 1 of fuel tank 15;
First load communication port 61 of the first pilot operated directional control valve 6 connects second oil inlet 1 of the 5th shuttle valve 10A and the oil inlet 2 of the first balance cock 9A respectively, the return opening 64 that second load communication port 62 of the first pilot operated directional control valve 6 connects first oil inlet 3 of the 5th shuttle valve 10A and oil inlet 2, first pilot operated directional control valve 6 of the second balance cock 9B respectively connects the second return opening 2 of fuel tank 15;
First load communication port 71 of the second pilot operated directional control valve 7 connects the second oil inlet 1, first hook oil cylinder 13A and second hook oil cylinder 13B, the first support oil cylinder 12A and the second support oil cylinder 12B of the 6th shuttle valve 10C respectively, second load communication port 72 of the second pilot operated directional control valve 7 connects the first oil inlet 3, first hook oil cylinder 13A and second hook oil cylinder 13B, the first support oil cylinder 12A and the second support oil cylinder 12B of the 6th shuttle valve 10C respectively, and the return opening 74 of the second pilot operated directional control valve 7 connects the second return opening 2 of fuel tank 15;
The oil outlet 2 of the 5th shuttle valve 10A connects second oil inlet 1 of the 7th shuttle valve 10B, the oil outlet 2 of the 6th shuttle valve 10C connects the oil outlet 2 feedback signal mouth 23 of connecting tee pressure compensator 2 and the oil inlet 31 of safety valve 3 respectively of first oil inlet the 3, seven shuttle valve 10B of the 7th shuttle valve 10B;
The return opening 22 of three-way pressure compensating device 2 and the oil outlet 32 of safety valve 3 are connected in parallel the second return opening 2 of fuel tank 15;
Oil outlet 1 and the oil outlet 1 of the second balance cock 9B of the first balance cock 9A are connected the first moved arm lifting oil cylinder 11A and the second moved arm lifting oil cylinder 11B respectively, the outside control mouth 3 that the outside control mouth 3 of the first balance cock 9A connects oil inlet 2, the second balance cock 9B of the second balance cock 9B connects the oil inlet 2 of the first balance cock 9A.
First load communication port 71 of the second pilot operated directional control valve directly arrives the first hook oil cylinder 13A and second hook oil cylinder 13B, and the second load communication port 72 of the second pilot operated directional control valve arrives the first hook oil cylinder 13A and second hook oil cylinder 13B by hydraulic control one-way valve 14.
Embodiment:
One, fix-displacement pump 1 is as propulsion source, and power is all from engine in situ, and power is passed to Hydraulic Pump through change speed gear box and power takeoff.
Two, the pressure oil of the outlet P1 of fix-displacement pump 1 directly arrives oil inlet 2, the oil inlet 2 of the 3rd threeway solenoid-operated proportional reducing valve 5C, the oil inlet 2 of the 4th threeway solenoid-operated proportional reducing valve 5D of oil inlet 2, the second threeway solenoid-operated proportional reducing valve 5B of oil inlet 73, the first threeway solenoid-operated proportional reducing valve 5A of oil inlet 63, second pilot operated directional control valve 7 of oil inlet 21, first pilot operated directional control valve 6 of three-way pressure compensating device 2, the oil inlet 42 of reducing valve 4.
Three, after fix-displacement pump 1 starts, when system does not have an electric signal, three-way pressure compensating device 2 is with the setting pressure of pressure spring (general 0.9MPa) overflow, and whole flows of pump overflow back fuel tank.The pressure of the oil outlet P1 of fix-displacement pump 1 is.
Four, when the electromagnet Y1 of the first threeway solenoid-operated proportional reducing valve 5A obtains the electric signal that signal generator in operator's compartment sends, then the oil outlet 1 of the first threeway solenoid-operated proportional reducing valve 5A has the pilot pressure oil be in proportion with electric signal to flow out, pilot pressure oil is through first oil inlet 3 of the first shuttle valve 10D, oil outlet 2, the left side commutation control mouth 65 of final arrival first pilot operated directional control valve 6, this pilot pressure oil promotes the spool of the first pilot operated directional control valve 6, make it move right, spool is opened, the pressure oil of working connection P1 is caused to arrive the oil inlet 2 of the first balance cock 9A and second oil inlet 1 of the 5th shuttle valve 10A through the first load communication port 61 of the first pilot operated directional control valve 6.
Major part pressure oil arrives the large chamber of the first moved arm lifting oil cylinder 11A and the second moved arm lifting oil cylinder 11B through the oil inlet 2 of the first balance cock 9A, oil outlet 1, A1, promotes piston rod and stretches out; Some pressure oil is through the second oil inlet 1, the oil outlet 2 of the 5th shuttle valve 10A, arrive first oil inlet 3 of the 7th shuttle valve 10B, the 7th shuttle valve 10B oil outlet 2 to the feedback signal mouth 23 of three-way pressure compensating device 2, this hydraulic oil is load pressure feedback signal.
Three-way pressure compensating device 2 is under the effect of the load feedback signal of feedback signal mouth 23, and the pressure of oil inlet 21 also can rise to only than the setting pressure (general 0.9MPa) of load feedback signal height pressure spring.Namely the pressure of P1 is only high than load pressure.Pressure reduction now between the oil inlet 63 of the first pilot operated directional control valve 6 and the first load communication port 61 is also, for certain value, make by the flow of the first pilot operated directional control valve 6 only relevant in its valve core opening size, the flow that system provides it to need to the large chamber of the first moved arm lifting oil cylinder 11A and the second moved arm lifting oil cylinder 11B, the flow that fix-displacement pump 1 is unnecessary, overflowed back the second return opening 2 of fuel tank 15 through the return opening 22 of three-way pressure compensating device 2, T1 with only high than load pressure pressure by three-way pressure compensating device 2, load pressure is less, then oil pressure relief is lower.And unlike common throttling speed control circuit, no matter load pressure is high or low, fix-displacement pump 1 with constant by pass valve setting high pressure kicks oil sump tank 15, makes cal val greatly reduce all the time.
The effect of its safety valve of safety valve 3, when load feedback pressure signal exceedes its setting value, safety valve 3 works, and is limited in its range of set value by the pressure of load system.
Five, when the electromagnet Y2 of the second threeway solenoid-operated proportional reducing valve 5B obtains the electric signal that signal generator in operator's compartment sends, then the oil outlet 1 of the second threeway solenoid-operated proportional reducing valve 5B has the pilot pressure oil be in proportion with electric signal to flow out, pilot pressure oil is through first oil inlet 3 of the second shuttle valve 10E, oil outlet 2, the right side commutation control mouth 66 of final arrival first pilot operated directional control valve 6, this pilot pressure oil promotes the spool of the first pilot operated directional control valve 6, make it to left movement, spool is opened, the pressure oil of working connection P1 is caused to arrive the oil inlet 2 of the second balance cock 9B and first oil inlet 3 of the 5th shuttle valve 10A through the second load communication port 62 of the first pilot operated directional control valve 6.
Major part pressure oil arrives the loculus of the first moved arm lifting oil cylinder 11A and the second moved arm lifting oil cylinder 11B through the oil inlet 2 of the second balance cock 9B, oil outlet 1, B1, promotes piston rod and retracts; Some pressure oil is through the first oil inlet 3, the oil outlet 2 of the 5th shuttle valve 10A, arrive second oil inlet 1 of the 7th shuttle valve 10B, the oil outlet 2 of the 7th shuttle valve 10B arrives the feedback signal mouth 23 of three-way pressure compensating device 2, and this hydraulic oil is load pressure feedback signal.
Three-way pressure compensating device 2 is under the effect of the load feedback signal of feedback signal mouth 23, and the pressure of oil inlet 21 also can rise to only than the setting pressure (general 0.9MPa) of load feedback signal height pressure spring.Namely the pressure of P1 is only high than load pressure.Pressure reduction now between the oil inlet 63 of the first pilot operated directional control valve 6 and the second load communication port 62 is also, for certain value, make by the flow of the first pilot operated directional control valve 6 only relevant in its valve core opening size, the flow that system provides it to need to the loculus of the first moved arm lifting oil cylinder 11A and the second moved arm lifting oil cylinder 11B, the flow that fix-displacement pump 1 is unnecessary, overflowed back the second return opening 2 of fuel tank 15 through the return opening 22 of three-way pressure compensating device 2, T1 with only high than load pressure pressure by three-way pressure compensating device 2, load pressure is less, then oil pressure relief is lower.And unlike common throttling speed control circuit, no matter load pressure is high or low, fix-displacement pump 1 with constant by pass valve setting high pressure kicks oil sump tank 15, makes cal val greatly reduce all the time.
The effect of its safety valve of safety valve 3, when load feedback pressure signal exceedes its setting value, safety valve 3 works, and is limited in its range of set value by the pressure of load system.
Six, when the electromagnet Y3 of the 3rd threeway solenoid-operated proportional reducing valve 5C obtains the electric signal that signal generator in operator's compartment sends, then the oil outlet 1 of the 3rd threeway solenoid-operated proportional reducing valve 5C has the pilot pressure oil be in proportion with electric signal to flow out, pilot pressure oil is through first oil inlet 3 of the 3rd shuttle valve 10F, oil outlet 2, the left side commutation control mouth 75 of final arrival second pilot operated directional control valve 7, this pilot pressure oil promotes the spool of the second pilot operated directional control valve 7, make it move right, spool is opened, the pressure oil of working connection P1 is caused to arrive second oil inlet 1 of the 6th shuttle valve 10C through the first load communication port 71 of the second pilot operated directional control valve 7, and the first support oil cylinder 12A, the large chamber of the second support oil cylinder 12B and the first hook oil cylinder 13A, the large chamber of the second hook oil cylinder 13B.
Major part pressure oil arrives the first support oil cylinder 12A through A2, oil cylinder 13A is linked up with in the large chamber and first of the second support oil cylinder 12B, the large chamber of the second hook oil cylinder 13B, promotes piston rod and stretches out; Some pressure oil is through the second oil inlet 1, the oil outlet 2 of the 6th shuttle valve 10C, arrive first oil inlet 3 of the 7th shuttle valve 10B, the 7th shuttle valve 10B oil outlet 2 to the feedback signal mouth 23 of three-way pressure compensating device 2, this hydraulic oil is load pressure feedback signal.
Three-way pressure compensating device 2 is under the effect of the load feedback signal of feedback signal mouth 23, and the pressure of oil inlet 21 also can rise to only than the setting pressure (general 0.9MPa) of load feedback signal height pressure spring.Namely the pressure of P1 is only high than load pressure.Pressure reduction now between the oil inlet 73 of the second pilot operated directional control valve 7 and the first load communication port 71 is also, for certain value, make by the flow of the second pilot operated directional control valve 7 only relevant in its valve core opening size, system is to the first support oil cylinder 12A, the large chamber of the second support oil cylinder 12B and the first hook oil cylinder 13A, the flow that the second large chamber linking up with oil cylinder 13B provides it to need, the flow that fix-displacement pump 1 is unnecessary, by three-way pressure compensating device 2 with the return opening 22 of only high than load pressure pressure through three-way pressure compensating device 2, T1 overflows back the second return opening 2 of fuel tank 15, load pressure is less, then oil pressure relief is lower.And unlike common throttling speed control circuit, no matter load pressure is high or low, fix-displacement pump 1 with constant by pass valve setting high pressure kicks oil sump tank 15, makes cal val greatly reduce all the time.
The effect of its safety valve of safety valve 3, when load feedback pressure signal exceedes its setting value, safety valve 3 works, and is limited in its range of set value by the pressure of load system.
Seven, when the electromagnet Y4 of the 4th threeway solenoid-operated proportional reducing valve 5D obtains the electric signal that signal generator in operator's compartment sends, then the oil outlet 1 of the 4th threeway solenoid-operated proportional reducing valve 5D has the pilot pressure oil be in proportion with electric signal to flow out, pilot pressure oil is through first oil inlet 3 of the 4th shuttle valve 10G, oil outlet 2, the right side commutation control mouth 76 of final arrival second pilot operated directional control valve 7, this pilot pressure oil promotes the spool of the second pilot operated directional control valve 7, make it to left movement, spool is opened, the pressure oil of working connection P1 is caused to arrive first oil inlet 3 of the 6th shuttle valve 10C through the second load communication port 72 of the second pilot operated directional control valve 7, and the first support oil cylinder 12A, the loculus of the second support oil cylinder 12B and the first hook oil cylinder 13A, the loculus of the second hook oil cylinder 13B.
Major part pressure oil arrives the first support oil cylinder 12A through B2, the loculus and first of the second support oil cylinder 12B links up with oil cylinder 13A, the loculus of the second hook oil cylinder 13B, promotes piston rod and retracts; Some pressure oil is through the first oil inlet 3, the oil outlet 2 of the 6th shuttle valve 10C, arrive first oil inlet 3 of the 7th shuttle valve 10B, the 7th shuttle valve 10B oil outlet 2 to the feedback signal mouth 23 of three-way pressure compensating device 2, this hydraulic oil is load pressure feedback signal.
Three-way pressure compensating device 2 is under the effect of the load feedback signal of feedback signal mouth 23, and the pressure of oil inlet 21 also can rise to only than the setting pressure (general 0.9MPa) of load feedback signal height pressure spring.Namely the pressure of P1 is only high than load pressure.Pressure reduction now between the oil inlet 73 of the second pilot operated directional control valve 7 and the second load communication port 72 is also, for certain value, make by the flow of the second pilot operated directional control valve 7 only relevant in its valve core opening size, system is to the first support oil cylinder 12A, the loculus of the second support oil cylinder 12B and the first hook oil cylinder 13A, the flow that second loculus linking up with oil cylinder 13B provides it to need, the flow that fix-displacement pump 1 is unnecessary, by three-way pressure compensating device 2 with the return opening 22 of only high than load pressure pressure through three-way pressure compensating device 2, T1 overflows back the second return opening 2 of fuel tank 15, load pressure is less, then oil pressure relief is lower.And unlike common throttling speed control circuit, no matter load pressure is high or low, fix-displacement pump 1 with constant by pass valve setting high pressure kicks oil sump tank 15, makes cal val greatly reduce all the time.
The effect of its safety valve of safety valve 3, when load feedback pressure signal exceedes its setting value, safety valve 3 works, and is limited in its range of set value by the pressure of load system.
Eight, when adopting remote operation outward at operator's compartment, after fix-displacement pump 1 delivery pressure oil P1 arrives the oil inlet 42 of reducing valve 4, low pressure oil arrives the oil inlet 3 of the first threeway proportional pressure-reducing valve 8A through P2 from oil outlet 41.When the handle of operation first threeway proportional pressure-reducing valve 8A, then the oil outlet 2 of the first threeway proportional pressure-reducing valve 8A has proportional with the spool stroke of the first threeway proportional pressure-reducing valve 8A pilot pressure oil and flows out.Pilot pressure oil is through the second oil inlet 1, the oil outlet 2 of the first shuttle valve 10D, the left side commutation control mouth 65 of final arrival first pilot operated directional control valve 6, this pilot pressure oil promotes the spool of pilot operated directional control valve 6, makes it move right, spool is opened, and follow-up work principle is the same with described in above-mentioned four.
Nine, when the handle of operation second threeway proportional pressure-reducing valve 8B, then the oil outlet 2 of the second threeway proportional pressure-reducing valve 8B has proportional with the spool stroke of the second threeway proportional pressure-reducing valve 8B pilot pressure oil and flows out.Pilot pressure oil is through the second oil inlet 1, the oil outlet 2 of the second shuttle valve 10E, the right side commutation control mouth 66 of final arrival first pilot operated directional control valve 6, this pilot pressure oil promotes the spool of the first pilot operated directional control valve 6, make it to left movement, spool is opened, and follow-up work principle is the same with described in above-mentioned five.
Ten, when the handle of operation the 3rd threeway proportional pressure-reducing valve 8C, then the oil outlet 2 of the 3rd threeway proportional pressure-reducing valve 8C has proportional with the spool stroke of the 3rd threeway proportional pressure-reducing valve 8C pilot pressure oil and flows out.Pilot pressure oil is through the second oil inlet 1, the oil outlet 2 of the 3rd shuttle valve 10F, the left side commutation control mouth 75 of final arrival second pilot operated directional control valve 7, this pilot pressure oil promotes the spool of the second pilot operated directional control valve 7, make it move right, spool is opened, and follow-up work principle is the same with described in above-mentioned six.
11, when the handle of operation the 4th threeway proportional pressure-reducing valve 8D, then the oil outlet 2 of the 4th threeway proportional pressure-reducing valve 8D has proportional with the spool stroke of the 4th threeway proportional pressure-reducing valve 8D pilot pressure oil and flows out.Pilot pressure oil is through the second oil inlet 1, the oil outlet 2 of the 4th shuttle valve 10G, the right side commutation control mouth 76 of final arrival second pilot operated directional control valve 7, this pilot pressure oil promotes the spool of the second pilot operated directional control valve 7, make it to left movement, spool is opened, and follow-up work principle is the same with described in above-mentioned seven.
12, three-way pressure compensating device 2, safety valve 3, reducing valve 4, first threeway solenoid-operated proportional reducing valve 5A, second threeway solenoid-operated proportional reducing valve 5B, 3rd threeway solenoid-operated proportional reducing valve 5C, 4th threeway solenoid-operated proportional reducing valve 5D, first pilot operated directional control valve 6, second pilot operated directional control valve 7, first threeway proportional pressure-reducing valve 8A, second threeway proportional pressure-reducing valve 8B, 3rd threeway proportional pressure-reducing valve 8C, 4th threeway proportional pressure-reducing valve 8D, first balance cock 9A, second balance cock 9B, first shuttle valve 10D, second shuttle valve 10E, 3rd shuttle valve 10F, 4th shuttle valve 10G, 5th shuttle valve 10A, 6th shuttle valve 10C, 7th shuttle valve 10B all adopts inserted valve, be integrated on an oil path block.
13, electrical signal generator is arranged in operator's compartment, by the electromagnet Y3 of cable by the electromagnet Y2 of the electromagnet Y1 of electric signal transmission to the first threeway solenoid-operated proportional reducing valve 5A, the second threeway solenoid-operated proportional reducing valve 5B, the 3rd threeway solenoid-operated proportional reducing valve 5C, the electromagnet Y4 of the 4th threeway solenoid-operated proportional reducing valve 5D.
The present invention adopts electrical-liquid control mode, reduce the cal val of hydraulic efficiency pressure system, reduce the power dissipation of driving engine, adopt inserted valve integrated oil path block, installation dimension is little, realizes the connection directly from integrated package to oil cylinder, reduces connecting line, reduces leakage of oil, the present invention is easy for installation, and mechanical wearing and tearing, antijamming capability be strong, reduce oil consumption, energy-conservation, simple to operate, non-maintaining.
Claims (2)
1. for an electrohydraulic control system for bucket crane, it is characterized in that: it comprises fuel tank, fix-displacement pump, three-way pressure compensating device, safety valve, reducing valve, four threeway solenoid-operated proportional reducing valves, two pilot operated directional control valves, four threeway proportional pressure-reducing valves, two balance cocks, seven shuttle valves, two moved arm lifting oil cylinders, two support oil cylinders, two hook oil cylinders and hydraulic control one-way valves;
The entrance of fix-displacement pump connects fuel tank oil outlet, the oil inlet of the oil inlet of the oil inlet of quantitative delivery side of pump difference connecting tee pressure compensator, the oil inlet of reducing valve, the first threeway solenoid-operated proportional reducing valve, the oil inlet of the second threeway solenoid-operated proportional reducing valve, the 3rd threeway solenoid-operated proportional reducing valve, the oil inlet of the 4th threeway solenoid-operated proportional reducing valve, the oil inlet of the first pilot operated directional control valve and the oil inlet of the second pilot operated directional control valve;
The oil outlet of the first threeway solenoid-operated proportional reducing valve connects the first oil inlet of the first shuttle valve, the oil outlet of the second threeway solenoid-operated proportional reducing valve connects the first oil inlet of the second shuttle valve, the oil outlet of the 3rd threeway solenoid-operated proportional reducing valve connects the first oil inlet of the 3rd shuttle valve, the oil outlet of the 4th threeway solenoid-operated proportional reducing valve connects the first oil inlet of the 4th shuttle valve, the return opening of the first threeway solenoid-operated proportional reducing valve, the return opening of the second threeway solenoid-operated proportional reducing valve, the return opening of the 3rd threeway solenoid-operated proportional reducing valve and the return opening of the 4th threeway solenoid-operated proportional reducing valve are parallel-connected to the first return opening of fuel tank,
Second oil inlet of the first shuttle valve connects the oil outlet of the first threeway proportional pressure-reducing valve, and the oil outlet of the first shuttle valve connects the left side commutation control mouth of the first pilot operated directional control valve;
Second oil inlet of the second shuttle valve connects the oil outlet of the second threeway proportional pressure-reducing valve, and the oil outlet of the second shuttle valve connects the right side commutation control mouth of the first pilot operated directional control valve;
Second oil inlet of the 3rd shuttle valve connects the oil outlet of the 3rd threeway proportional pressure-reducing valve, and the oil outlet of the 3rd shuttle valve connects the left side commutation control mouth of the second pilot operated directional control valve;
Second oil inlet of the 4th shuttle valve connects the oil outlet of the 4th threeway proportional pressure-reducing valve, and the oil outlet of the 4th shuttle valve connects the right side commutation control mouth of the second pilot operated directional control valve;
The oil inlet of the first threeway proportional pressure-reducing valve, the oil inlet of the second threeway proportional pressure-reducing valve, the oil inlet of the 3rd threeway proportional pressure-reducing valve and the oil inlet of the 4th threeway proportional pressure-reducing valve are parallel-connected to the oil outlet of reducing valve, and the return opening of the first threeway proportional pressure-reducing valve, the return opening of the second threeway proportional pressure-reducing valve, the return opening of the 3rd threeway proportional pressure-reducing valve and the return opening of the 4th threeway proportional pressure-reducing valve are parallel-connected to the first return opening of fuel tank;
The outer drain tap of reducing valve is connected to the first return opening of fuel tank;
First load communication port of the first pilot operated directional control valve connects the second oil inlet of the 5th shuttle valve and the oil inlet of the first balance cock respectively, second load communication port of the first pilot operated directional control valve connects the first oil inlet of the 5th shuttle valve and the oil inlet of the second balance cock respectively, and the return opening of the first pilot operated directional control valve connects the second return opening of fuel tank;
First load communication port of the second pilot operated directional control valve connects the second oil inlet of the 6th shuttle valve, the first hook oil cylinder and the second hook oil cylinder, the first support oil cylinder and the second support oil cylinder respectively, second load communication port of the second pilot operated directional control valve connects the first oil inlet of the 6th shuttle valve, the first hook oil cylinder and the second hook oil cylinder, the first support oil cylinder and the second support oil cylinder respectively, and the return opening of the second pilot operated directional control valve connects the second return opening of fuel tank;
The oil outlet of the 5th shuttle valve connects the second oil inlet of the 7th shuttle valve, and the oil outlet of the 6th shuttle valve connects the first oil inlet of the 7th shuttle valve, the oil outlet feedback signal mouth of connecting tee pressure compensator and the oil inlet of safety valve respectively of the 7th shuttle valve;
The return opening of three-way pressure compensating device and the oil outlet of safety valve are connected in parallel the second return opening of fuel tank;
The oil outlet of the first balance cock and the oil outlet of the second balance cock are connected the first moved arm lifting oil cylinder and the second moved arm lifting oil cylinder respectively, the outside control mouth of the first balance cock connects the oil inlet of the second balance cock, and the outside control mouth of the second balance cock connects the oil inlet of the first balance cock.
2. the electrohydraulic control system for bucket crane according to claim 1, it is characterized in that: the first load communication port of the second pilot operated directional control valve directly arrives the first hook oil cylinder and the second hook oil cylinder, the second load communication port of the second pilot operated directional control valve arrives the first hook oil cylinder and the second hook oil cylinder by hydraulic control one-way valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110282891.0A CN103010069B (en) | 2011-09-22 | 2011-09-22 | For the electrohydraulic control system of bucket crane |
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| CN201110282891.0A CN103010069B (en) | 2011-09-22 | 2011-09-22 | For the electrohydraulic control system of bucket crane |
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| CN103010069B true CN103010069B (en) | 2015-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105201951B (en) * | 2015-10-16 | 2017-03-01 | 浙江大学 | The controlled TBM support hydraulic pressure system of high-efficiency high-accuracy flow |
| CN105298971B (en) * | 2015-11-13 | 2018-04-13 | 上海华测导航技术股份有限公司 | The hydraulic control valve group of agricultural machinery automatic steering system |
| CN107178532A (en) * | 2017-05-19 | 2017-09-19 | 青神格林维尔流体动力控制技术有限公司 | A kind of compressor assembly plug-in integrated package |
| CN107762995B (en) * | 2017-09-13 | 2023-12-22 | 江苏恒立液压科技有限公司 | Novel electric proportion overflow device |
| CN113048107A (en) * | 2021-04-20 | 2021-06-29 | 杭叉集团股份有限公司 | Electric proportional control hydraulic system |
| CN114060332B (en) * | 2021-12-02 | 2022-09-09 | 中煤科工集团重庆研究院有限公司 | Anti-deviation crawler walking hydraulic system |
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| EP0248967A1 (en) * | 1986-06-06 | 1987-12-16 | Agustin Espina D. Diaz | Hydraluc system |
| CN1356223A (en) * | 2000-09-12 | 2002-07-03 | 株式会社小松制作所 | System for controlling operation of oil cylinde in vehicle |
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Effective date of registration: 20210419 Address after: 200941, No. 8, building 168, four Yuan Road, Shanghai, Baoshan District Patentee after: SHANGHAI BAOYE METALLURGY ENGINEERING Co.,Ltd. Address before: 200941 No. 2457, Fuyuan Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOYE GROUP Corp.,Ltd. |
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