CN202789786U - Hydraulic system and concrete pump truck and engineering machinery comprising same - Google Patents
Hydraulic system and concrete pump truck and engineering machinery comprising same Download PDFInfo
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- CN202789786U CN202789786U CN201220473928.8U CN201220473928U CN202789786U CN 202789786 U CN202789786 U CN 202789786U CN 201220473928 U CN201220473928 U CN 201220473928U CN 202789786 U CN202789786 U CN 202789786U
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- 239000003921 oil Substances 0.000 claims abstract description 95
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 42
- 230000009471 action Effects 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
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Abstract
The utility model provides a hydraulic system and contain this hydraulic system's mobile concrete pump, engineering machine tool. The hydraulic system comprises a power device (10), a reversing mechanism (20) and an executing mechanism (30), wherein the power device (10) is connected with the reversing mechanism (20) and provides hydraulic oil for the reversing mechanism (20), the reversing mechanism (20) is in driving connection with the executing mechanism (30) and controls the action of the executing mechanism (30), the reversing mechanism (20) comprises a proportional multi-way valve (21), a reversing valve (40) is arranged on a hydraulic connecting pipeline between the proportional multi-way valve (21) of the reversing mechanism (20) and the executing mechanism (30), the reversing valve (40) controls the action of the executing mechanism (30), and an oil return port of the reversing valve (40) is connected to an oil return tank. According to the utility model discloses a hydraulic system can avoid proportion multiple unit valve jamming, prevents that actuating mechanism does not act the phenomenon.
Description
Technical field
The utility model relates to engineering machinery field, in particular to a kind of hydraulic system and comprise concrete mixer, the engineering machinery of this hydraulic system.
Background technique
In the engineering construction process, need to transport, pour into a mould a large amount of concrete, conventional construction method is to adopt wheelbarrow, tower crane etc. to transport concrete, but these methods obviously do not meet the Current Engineering Construction requirement.And have the advantages such as efficient height, quality is good, labor intensity is low by the mode that concrete pump carries out pumping construction, therefore in Current Engineering Construction, use more and more extensive.
Because concrete mixer can adjust job location and boundary of works area at any time in construction work, use more flexibly and easily, therefore application is more extensive.The adjustment of the boundary of works area of concrete mixer mainly be by jib revolution and jib take down the exhibits realize.
Fig. 1 is the hydraulic system of the upper dress of the existing concrete pump truck simplified, the forward and reverse of oil hydraulic motor be by replacing of two proportion electro-magnets of the first selector valve 211 ' of multi-channel proportional valve electric and dead electricity realize, two proportion electro-magnets interlockings of first selector valve 211 '.The rotary reducer of fluid motor-driven swirl gear 31 ' rotates, and rotary reducer drives turntable again and rotates, thereby realizes the revolution of jib.Similar with the control principle of oil hydraulic motor, oil cylinder extending means 32 ' flexible be by two proportion electro-magnets of second selector valve 212 ' of multi-channel proportional valve replace electricly, dead electricity realizes that the exhibition of the flexible corresponding jib of oil cylinder extending means 32 ' is received.
When carrying out above-mentioned action, the oil-feed of oil circuit, oil return all need the passing ratio multi-way valve, and parts are more because fluid is flowed through, and take away some impurity easily in the process that flows, and cause fluid unclean.Because proportional multi-way valve having relatively high expectations to oil cleanliness, when in case the oil cleanliness in the system can't guarantee, cause easily the clamping stagnation of each selector valve of proportional multi-way valve, the revolution that affects jib with take down the exhibits etc., thereby cause each actuator of concrete mixer to move.
The model utility content
The utility model aims to provide a kind of hydraulic system and comprises concrete mixer, the engineering machinery of this hydraulic system, can avoid the proportional multi-way valve clamping stagnation, prevents actuator's phenomenon of being failure to actuate.
To achieve these goals, according to an aspect of the present utility model, a kind of hydraulic system is provided, comprise power plant, changement and actuator, power plant are connected with changement, and provide hydraulic oil to changement, changement drives with actuator and is connected, the action of control actuator, changement comprises proportional multi-way valve, be provided with selector valve on the proportional multi-way valve of changement and the hydraulic connecting pipeline between the actuator, the action of selector valve control actuator, and the return opening of selector valve is connected to oil sump tank.
Further, actuator comprises swirl gear, the first selector valve of proportional multi-way valve is connected by the hydraulic connecting pipeline with swirl gear, selector valve comprises the first solenoid directional control valve on the hydraulic connecting pipeline that is arranged between first selector valve and the swirl gear, and the return opening of the first solenoid directional control valve is connected to oil sump tank.
Further, actuator also comprises the oil cylinder extending means, the first selector valve is connected by the hydraulic connecting pipeline with the oil cylinder extending means, selector valve also comprises the second solenoid directional control valve on the hydraulic connecting pipeline that is arranged between first selector valve and the oil cylinder extending means, the return opening of the second solenoid directional control valve is connected to oil sump tank, and the filler opening of the first solenoid directional control valve and the second solenoid directional control valve is connected to respectively the different operating hydraulic fluid port of first selector valve.
Further, actuator also comprises the oil cylinder extending means, proportional multi-way valve also comprises second selector valve that is arranged in parallel with the first selector valve, second selector valve is connected by the hydraulic connecting pipeline with the oil cylinder extending means, selector valve also comprises the second solenoid directional control valve on the hydraulic connecting pipeline that is arranged between second selector valve and the oil cylinder extending means, and the return opening of the second solenoid directional control valve is connected to oil sump tank.
Further, power plant comprise along the flow direction of hydraulic oil and are connected on successively oil absorption filter, oil hydraulic pump and high pressure filter on the hydraulic connecting pipeline.
Further, be provided with revolution buffer-braking valve on the hydraulic connecting pipeline between swirl gear and the first solenoid directional control valve.
Further, be connected on the hydraulic connecting pipeline of rodless cavity of oil cylinder extending means and be provided with the first equilibrium valve, be connected on the hydraulic connecting pipeline of rod chamber of oil cylinder extending means and be provided with the second equilibrium valve.
Further, selector valve is two four-way electromagnetic reversing valves.
According on the other hand of the present utility model, a kind of concrete mixer is provided, comprise hydraulic system, this hydraulic system is above-mentioned any hydraulic system.
Provide a kind of engineering machinery more on the one hand according to of the present utility model, comprised hydraulic system, this hydraulic system is above-mentioned any hydraulic system.
Use the technical solution of the utility model, hydraulic system comprises power plant, changement and actuator, power plant are connected with changement, and providing hydraulic oil to changement, changement drives with actuator and is connected, controls the action of actuator, changement comprises proportional multi-way valve, be provided with selector valve on the proportional multi-way valve of changement and the hydraulic connecting pipeline between the actuator, the action of selector valve control actuator, and the return opening of selector valve is connected to oil sump tank.Selector valve is arranged between proportional multi-way valve and the actuator, and the return opening of selector valve is connected to oil sump tank, so that hydraulic oil directly flows back to oil sump tank by selector valve after finishing drive actions, and need not to flow through again proportional multi-way valve, therefore the hydraulic oil that contains impurity during oil return can not impact by the Comparative Examples multi-way valve, guarantee the regular event of proportional multi-way valve, can avoid the proportional multi-way valve clamping stagnation, prevented actuator's phenomenon of being failure to actuate.
Description of drawings
The accompanying drawing that consists of a part of the present utility model is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 shows the structural representation of hydraulic system of the prior art;
Fig. 2 shows the structural representation according to the first embodiment's of the present utility model hydraulic system; And
Fig. 3 shows the structural representation according to the second embodiment's of the present utility model hydraulic system.
Embodiment
Hereinafter also describe in conjunction with the embodiments the utility model in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
According to embodiment of the present utility model, each the sheet Reversing valve plate in the proportional multi-way valve among each figure is upper as work take the station that is positioned at the top in the diagram, and the station that is positioned at the below in the diagram is that work is the next, and the station that is positioned at the centre in the diagram is the work meta.
As shown in Figures 2 and 3, according to embodiment of the present utility model, a kind of hydraulic system comprises power plant 10, changement 20 and actuator 30, power plant 10 are connected with changement 20, and provide hydraulic oil to changement 20, changement 20 drives with actuator 30 and is connected, the action of control actuator 30, changement 20 comprises multi-way valve, be provided with selector valve 40 on the proportional multi-way valve 21 of changement 20 and the hydraulic connecting pipeline between the actuator 30, the action of selector valve 40 control actuators 30, and the return opening of selector valve 40 is connected to oil sump tank.Selector valve 40 in the present embodiment can be replaced with the selector valve of other form, as long as this selector valve can be realized the automatic reverse function.
The power plant 10 of this hydraulic system comprise along the flow direction of hydraulic oil and are connected on successively oil absorption filter 11, oil hydraulic pump 12 and high pressure filter 13 on the hydraulic connecting pipeline.Fluid in the oil sources filters through oil absorption filter 11 under the suction of oil hydraulic pump 12, then enter in the oil hydraulic pump 12, be converted to pressure oil by oil hydraulic pump 12, and output enters the hydraulic connecting pipeline, after the process again filtration of high pressure filter 13, enter in the changement 20, and flowed to by changement 20 control hydraulic oil, realize the action control to actuator 30.Oil hydraulic pump 12 in the present embodiment is volume adjustable hydraulic pump.
Because before in the proportional multi-way valve 21 that enters changement 20, hydraulic oil will filter through oil absorption filter 11 and high pressure filter 13 first, therefore can guarantee to enter the turbidity test of the hydraulic oil in the proportional multi-way valve 21, the difficult catching phenomenon that occurs of proportional multi-way valve 21, can regular event, can not affect the action of actuator 30.And finish the task of driving actuator 30 actions when hydraulic oil after, can be back in the oil sump tank.Since hydraulic oil on the hydraulic connecting pipeline of flowing through a plurality of valve bodies and when participating in actuator's 30 action, can take away some impurity, and these impurity are the turbidity test that can affect hydraulic oil.If hydraulic oil through proportional multi-way valve 21 oil sump tanks, will cause cleanliness of hydraulic oil than more sensitive proportional multi-way valve 21 clamping stagnations, and then have influence on the action of actuator 30 in the process that refluxes.And the hydraulic connecting pipeline between proportional multi-way valve 21 and actuator 30 arranges selector valve 40, and the return opening of selector valve 40 is connected to oil sump tank, just can make hydraulic oil after the action that has participated in actuator 30, flow back to oil sump tank through selector valve 40, the too poor hydraulic oil of oil return turbidity test enters oil sump tank with regard to the proportional multi-way valve 21 of can not flowing through, just can not cause the clamping stagnation of proportional multi-way valve 21 yet, thereby avoided the be failure to actuate generation of phenomenon of actuator 30, solved because the problem that one or more actuators 30 that the clamping stagnation of multichannel valve block causes are failure to actuate.
The hydraulic system that adopts in the present embodiment not only is applicable to proportional multi-way valve, also is applicable to the multi-way valve of other form, the clamping stagnation of various multi-way valve is all had improve preferably effect.
As shown in Figure 2, according to first embodiment of the present utility model, the actuator 30 of hydraulic system comprises swirl gear 31 and oil cylinder extending means 32, proportional multi-way valve 21 comprises the first Reversing valve plate and the second Reversing valve plate, and selector valve 40 comprises the first solenoid directional control valve 41 and the second solenoid directional control valve 42.Wherein the first selector valve 211 of proportional multi-way valve 21 is connected by the hydraulic connecting pipeline with swirl gear 31, the first solenoid directional control valve 41 is arranged on the hydraulic connecting pipeline between first selector valve 211 and the swirl gear 31, be used for the revolution action of control swirl gear 31, and the return opening of the first solenoid directional control valve 41 is connected directly to oil sump tank.Second selector valve 212 of proportional multi-way valve 21 is arranged in parallel with first selector valve 211, and with oil cylinder extending means 32 between be connected by the hydraulic connecting pipeline.The second solenoid directional control valve 42 is arranged on the hydraulic connecting pipeline between second selector valve 212 and the oil cylinder extending means 32, is used for the expanding-contracting action of control oil cylinder extending means 32.The return opening of the second solenoid directional control valve 42 is connected directly to oil sump tank.
Revolution buffer-braking valve 33 can also be set on the hydraulic connecting pipeline between swirl gear 31 and the first solenoid directional control valve 41, be used for preventing swirl gear 31 being impacted when the oil hydraulic motor active force from undergoing mutation, improve the safety operation performance of swirl gear 31, also can prevent oil hydraulic motor automatic rotating when being subject to the weight Action of Gravity Field, keep the lift heavy state of oil hydraulic motor, avoid weight to fall rapidly.
Similarly, on the hydraulic connecting pipeline between oil cylinder extending means 32 and the second solenoid directional control valve 42, also be provided with the first equilibrium valve 34 and the second equilibrium valve 35, wherein the first equilibrium valve 34 is arranged on the hydraulic connecting pipeline of rodless cavity that the second solenoid directional control valve 42 is connected to oil cylinder extending means 32, and the second equilibrium valve 35 is arranged on the hydraulic connecting pipeline of rod chamber that the second solenoid directional control valve 42 is connected to oil cylinder extending means 32.By the interaction of two equilibrium valves, can improve the adaptability to changes of oil cylinder extending means 32 when undergoing mutation situation, improve the Safety performance of telescopic oil cylinder mechanism.
In the present embodiment, selector valve 40 can be two position and four-way reversing valves 40, also can be three position four-way directional control valve, can also be other selector valve 40, or other to the less demanding selector valve of cleanliness of hydraulic oil.When selector valve 40 was three position four-way directional control valve, if spool is positioned at meta, then four of three position four-way directional control valve hydraulic fluid ports did not respectively communicate.
As can be seen from Figure 2, two electromagnet of the first selector valve 211 of proportional multi-way valve 21 are DT1 and DT2, two electromagnet of second selector valve 212 are DT3 and DT4, and the electromagnet of the first solenoid directional control valve 41 is DT5, and the electromagnet of the second solenoid directional control valve 42 is DT6.When hydraulic work system, can control by size of current the flow of two multichannel valve blocks of hydraulic oil passing ratio multi-way valve 21.When DT1 gets when electric, the first selector valve 211 of proportional multi-way valve 21 is operated in the next, hydraulic oil drives swirl gear 31 actions by the first solenoid directional control valve 41, and regulate the electromagnet DT5 of the first solenoid directional control valve 41 this moment, can control the clockwise and anticlockwise action of swirl gear 31.When DT2 gets when electric, first selector valve 211 is operated in upper, and hydraulic oil disconnects with the hydraulic connecting pipeline that is connected to the first solenoid directional control valve 41, and the hydraulic fluid port that is communicated with hydraulic oil is in stand-by state.
When DT3 gets when electric, second selector valve 212 of proportional multi-way valve 21 is operated in the next, hydraulic oil drives 32 actions of oil cylinder extending means by the first solenoid directional control valve 41, and regulate the electromagnet DT6 of the second solenoid directional control valve 42 this moment, can control the expanding-contracting action of oil cylinder extending means 32.When DT2 gets when electric, it is upper that second selector valve 212 is operated in, and hydraulic oil disconnects with the hydraulic connecting pipeline that is connected to the second solenoid directional control valve 42, and the hydraulic fluid port that is communicated with hydraulic oil is in stand-by state.
When hydraulic oil is communicated with the first solenoid directional control valve 41, electric if DT5 gets, swirl gear 31 forwards then, if the DT5 dead electricity, then swirl gear 31 counter-rotatings.When hydraulic oil was communicated with the second solenoid directional control valve 42, electric if DT6 gets, then oil cylinder extending means 32 stretched out, if the DT6 dead electricity, then oil cylinder extending means 32 is retracted.
Certainly, the hydraulic system of present embodiment, also can only comprise the first selector valve 211 of swirl gear 31, proportional multi-way valve 21 and the first solenoid directional control valve 41 of control swirl gear 31 actions, or only comprise second selector valve 212 of oil cylinder extending means 32, proportional multi-way valve 21 and the second solenoid directional control valve 42 of controlling 32 actions of oil cylinder extending means.
As shown in Figure 3, according to the second embodiment of the present utility model, proportional multi-way valve 21 comprises first selector valve 211, and actuator 30 comprises swirl gear 31 and oil cylinder extending means 32, and selector valve 40 comprises the first solenoid directional control valve 41 and the second solenoid directional control valve 42.Wherein swirl gear 31 is connected with the oil cylinder extending means and all is connected with first selector valve 211, and the filler opening of swirl gear 31 and oil cylinder extending means 32 is connected to respectively the different operating hydraulic fluid port of first selector valve 211.The first solenoid directional control valve 41 is arranged on the hydraulic connecting pipeline between first selector valve 211 and the swirl gear 31, the second solenoid directional control valve 42 is arranged on the hydraulic connecting pipeline between second selector valve 212 and the oil cylinder extending means 32, and the return opening of the first solenoid directional control valve 41 and the second solenoid directional control valve 42 all is connected directly to oil sump tank.In the present embodiment, two selector valves 40 can be two position and four-way reversing valves 40, also can be three position four-way directional control valve, can also be other selector valve 40, or other to the less demanding selector valve of cleanliness of hydraulic oil.
Other structure of present embodiment is identical with the first embodiment, no longer describes in detail here.
As shown in Figure 3, when hydraulic work system, can control by size of current the flow of two multichannel valve blocks of hydraulic oil passing ratio multi-way valve 21.When DT1 gets when electric, the first selector valve 211 of proportional multi-way valve 21 is operated in the next, hydraulic oil drives swirl gear 31 actions by the first solenoid directional control valve 41, and regulate the electromagnet DT5 of the first solenoid directional control valve 41 this moment, can control the clockwise and anticlockwise action of swirl gear 31.This moment, hydraulic oil and being connected between the hydraulic connecting pipeline of oil cylinder extending means 32 disconnected, and oil cylinder extending means 32 is failure to actuate.
When DT2 gets when electric, first selector valve 211 is operated in upper, and hydraulic oil disconnects with the hydraulic connecting pipeline that is connected to the first solenoid directional control valve 41, and swirl gear 31 keeps current states.This moment hydraulic oil be connected to the hydraulic connecting pipeline connection of the second solenoid directional control valve 42, hydraulic oil enters oil cylinder extending means 32 by the second solenoid directional control valve 42, and driving oil cylinder extending means 32 actions, by controlling the electromagnet DT6 of the second solenoid directional control valve 42, just can control the expanding-contracting action of oil cylinder extending means 32.
When hydraulic oil is communicated with the first solenoid directional control valve 41, electric if DT5 gets, swirl gear 31 forwards then, if the DT5 dead electricity, then swirl gear 31 counter-rotatings.When hydraulic oil was communicated with the second solenoid directional control valve 42, electric if DT6 gets, then oil cylinder extending means 32 stretched out, if the DT6 dead electricity, then oil cylinder extending means 32 is retracted.
In each embodiment of the present utility model, two examples that the number of selector valve 40 is not limited to enumerate, the number of actuator 30 also can be for more, how much quantity of selector valve 40 finally determining, and an independent selector valve 40 is corresponding to an independent actuator 30 by actuator 30.In addition, the number of the multichannel valve block of proportional multi-way valve 21 also being decided by what of actuator 30.
According to embodiment of the present utility model, a kind of concrete mixer comprises above-mentioned hydraulic system.
According to embodiment of the present utility model, a kind of engineering machinery comprises above-mentioned hydraulic system.
From above description, can find out, the utility model the above embodiments have realized following technique effect: hydraulic system comprises power plant, changement and actuator, power plant are connected with changement, and provide hydraulic oil to changement, changement drives with actuator and is connected, the action of control actuator, changement comprises proportional multi-way valve, be provided with selector valve on the proportional multi-way valve of changement and the hydraulic connecting pipeline between the actuator, the action of selector valve control actuator, and the return opening of selector valve is connected to oil sump tank.Selector valve is arranged between proportional multi-way valve and the actuator, and the return opening of selector valve is connected to oil sump tank, so that hydraulic oil directly flows back to oil sump tank by selector valve after finishing drive actions, and need not to flow through again proportional multi-way valve, therefore the hydraulic oil that contains impurity during oil return can not impact by the Comparative Examples multi-way valve, guarantee the regular event of proportional multi-way valve, can avoid the proportional multi-way valve clamping stagnation, prevented actuator's phenomenon of being failure to actuate.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. hydraulic system, comprise power plant (10), changement (20) and actuator (30), described power plant (10) are connected with described changement (20), and provide hydraulic oil to described changement (20), described changement (20) drives with described actuator (30) and is connected, control the action of described actuator (30), described changement (20) comprises proportional multi-way valve (21), it is characterized in that, be provided with selector valve (40) on the proportional multi-way valve (21) of described changement (20) and the hydraulic connecting pipeline between the described actuator (30), described selector valve (40) is controlled the action of described actuator (30), and the return opening of described selector valve (40) is connected to oil sump tank.
2. hydraulic system according to claim 1, it is characterized in that, described actuator (30) comprises swirl gear (31), the first selector valve (211) of described proportional multi-way valve (21) is connected by described hydraulic connecting pipeline with described swirl gear (31), described selector valve (40) comprises the first solenoid directional control valve (41) on the described hydraulic connecting pipeline that is arranged between described first selector valve (211) and the described swirl gear (31), and the return opening of described the first solenoid directional control valve (41) is connected to described oil sump tank.
3. hydraulic system according to claim 2, it is characterized in that, described actuator (30) also comprises oil cylinder extending means (32), described first selector valve (211) is connected by described hydraulic connecting pipeline with described oil cylinder extending means (32), described selector valve (40) also comprises the second solenoid directional control valve (42) on the described hydraulic connecting pipeline that is arranged between described first selector valve (211) and the described oil cylinder extending means (32), the return opening of described the second solenoid directional control valve (42) is connected to described oil sump tank, and the filler opening of described the first solenoid directional control valve (41) and described the second solenoid directional control valve (42) is connected to respectively the different operating hydraulic fluid port of described first selector valve (211).
4. hydraulic system according to claim 2, it is characterized in that, described actuator (30) also comprises oil cylinder extending means (32), described proportional multi-way valve (21) also comprises second selector valve (212) that is arranged in parallel with described first selector valve (211), described second selector valve (212) is connected by described hydraulic connecting pipeline with described oil cylinder extending means (32), described selector valve (40) also comprises the second solenoid directional control valve (42) on the described hydraulic connecting pipeline that is arranged between described second selector valve (212) and the described oil cylinder extending means (32), and the return opening of described the second solenoid directional control valve (42) is connected to described oil sump tank.
5. hydraulic system according to claim 1, it is characterized in that described power plant (10) comprise along the flow direction of described hydraulic oil and are connected on successively oil absorption filter (11), oil hydraulic pump (12) and high pressure filter (13) on the described hydraulic connecting pipeline.
6. hydraulic system according to claim 2 is characterized in that, is provided with revolution buffer-braking valve (33) on the described hydraulic connecting pipeline between described swirl gear (31) and described the first solenoid directional control valve (41).
7. according to claim 3 or 4 described hydraulic systems, it is characterized in that, be connected on the described hydraulic connecting pipeline of rodless cavity of described oil cylinder extending means (32) and be provided with the first equilibrium valve (34), be connected on the described hydraulic connecting pipeline of rod chamber of described oil cylinder extending means (32) and be provided with the second equilibrium valve (35).
8. each described hydraulic system in 6 according to claim 1 is characterized in that described selector valve (40) is two four-way electromagnetic reversing valves.
9. a concrete mixer comprises hydraulic system, it is characterized in that, described hydraulic system is each described hydraulic system in the claim 1 to 8.
10. an engineering machinery comprises hydraulic system, it is characterized in that, described hydraulic system is each described hydraulic system in the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220473928.8U CN202789786U (en) | 2012-09-17 | 2012-09-17 | Hydraulic system and concrete pump truck and engineering machinery comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220473928.8U CN202789786U (en) | 2012-09-17 | 2012-09-17 | Hydraulic system and concrete pump truck and engineering machinery comprising same |
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| Publication Number | Publication Date |
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| CN202789786U true CN202789786U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220473928.8U Expired - Lifetime CN202789786U (en) | 2012-09-17 | 2012-09-17 | Hydraulic system and concrete pump truck and engineering machinery comprising same |
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| CN (1) | CN202789786U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235102A (en) * | 2014-09-04 | 2014-12-24 | 中联重科股份有限公司 | Getting-on hydraulic system and engineering machinery |
| CN106122155A (en) * | 2016-08-26 | 2016-11-16 | 徐工消防安全装备有限公司 | The balanced valve group that a kind of band opening time postpones |
| CN112610556A (en) * | 2020-12-07 | 2021-04-06 | 湖南挖挖工程科技有限公司 | Pump truck assembly integrated valve block structure and pump truck assembly |
-
2012
- 2012-09-17 CN CN201220473928.8U patent/CN202789786U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235102A (en) * | 2014-09-04 | 2014-12-24 | 中联重科股份有限公司 | Getting-on hydraulic system and engineering machinery |
| CN106122155A (en) * | 2016-08-26 | 2016-11-16 | 徐工消防安全装备有限公司 | The balanced valve group that a kind of band opening time postpones |
| CN106122155B (en) * | 2016-08-26 | 2018-08-03 | 徐工消防安全装备有限公司 | A kind of balance valve group of band opening time delay |
| CN112610556A (en) * | 2020-12-07 | 2021-04-06 | 湖南挖挖工程科技有限公司 | Pump truck assembly integrated valve block structure and pump truck assembly |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
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| CX01 | Expiry of patent term |