CN203702696U - Load-sensitive hydraulic system and engineering machinery - Google Patents
Load-sensitive hydraulic system and engineering machinery Download PDFInfo
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- CN203702696U CN203702696U CN201320875170.5U CN201320875170U CN203702696U CN 203702696 U CN203702696 U CN 203702696U CN 201320875170 U CN201320875170 U CN 201320875170U CN 203702696 U CN203702696 U CN 203702696U
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Abstract
The utility model provides a load-sensitive hydraulic system and engineering machinery. The load-sensitive hydraulic system comprises a variable pump, a proportional valve and at least two working groups, wherein each working group comprises an execution mechanism and a reversing valve, an oil inlet of the proportional valve is communicated with an oil outlet of the variable pump, a working oil opening is simultaneously communicated with a load-sensitive opening of the variable pump and oil inlets of the reversing valves of all the work groups; pressure compensation blocks are selectively connected in series to oil inlet lines of the reversing valves of all the work groups. According to the load-sensitive hydraulic system, the pressure compensation blocks are selectively arranged in front of the reversing valves of all the work groups, a pressure compensation function is set for each work group needing to perform composite actions so that the work group can perform the composite actions of distributing flow as required, and the pressure compensation function is not set for the work groups not needing to perform the composite actions, so the cost increase problem caused by redundant pressure compensation functions is further solved.
Description
Technical field
The utility model relates to hydraulics field, particularly a kind of load-sensitive hydraulic system and engineering machinery.
Background technique
At present, load-sensitive hydraulic system polygamy resultant pressure compensation technique jointly realizes the self adaption of flow and supplies with and distribution according to need, is generally made up of oil pump and pressure compensation multi-port valve.In traditional load sensitive system, each work connection of multi-way valve all possesses pressure compensation, and all mechanisms all have composite move ability, but often do not need in application.
One as disclosed in patent CN201843848U is based on the pressure compensated load-sensitive multiple directional control valve of modular design band, and this multi-way valve is in the application of crane hydraulic system, and its system schema, just exists following problem and shortage:
1, each connection multi-way valve all has pressure-compensated valve, and each mechanism that multi-way valve drives all can carry out composite move, but not on multi-way valve all mechanisms all need composite move function, cause performance redundancy, cost increases;
2, the equal adoption rate control unit of each connection multi-way valve, if can obtain good speed adjusting performance for main actuator, if but can increase the quantity of automatical control system ratio output port for general auxiliary system, increase automatical control system complexity and hardware cost;
3, expand dumbly, be not easy to increase work connection.
In view of the above problems and not enough, need to solve following problem:
1,, during without composite move, the cost that the pressure compensation of solution redundancy causes increases problem;
2,, in the not high general application of speed governing performance requirement, solve multiple proportional control ports and cause controlling complicated and cost increase problem;
3,, when increase work temporarily joins, solve the problem of the inconvenient problem of expansion and raising universal component rate.
Model utility content
In view of this, the utility model is intended to propose a kind of load-sensitive hydraulic system and engineering machinery, to address the above problem.
For achieving the above object, the technical solution of the utility model is achieved in that
On the one hand, the present embodiment discloses a kind of load-sensitive hydraulic system, comprise variable displacement pump, Proportional valve and at least two work connection, each work connection includes actuator and for controlling the selector valve of this actuator, the filler opening of described Proportional valve is communicated with the oil outlet of described variable displacement pump, the actuator port of described Proportional valve is communicated with the filler opening of the load-sensitive mouth of described variable displacement pump and the selector valve of each work connection simultaneously, and the return opening of the selector valve of the return opening of described Proportional valve and each work connection all takes back fuel tank; On the oil-feed oil circuit of the selector valve joining in each work, be optionally in series with pressure-compensated valve piece.
Further, described pressure-compensated valve piece comprises pressure reduction open valve and the adjustable restrictive valve of series connection, and described adjustable restrictive valve is arranged on the oil circuit at oil outlet place of described pressure reduction open valve or on the oil circuit at filler opening place.
Further, described pressure reduction open valve comprises pressure reduction reduction valve.
Further, described Proportional valve is proportional reversing valve or proportional throttle valve.
Further, oil circuit between described Proportional valve and each work connection comprises an extendible oil circuit module, described oil circuit module comprises oil-feed main road, oil return main road, be connected in oil-feed branch road described oil-feed main road on and with each work join corresponding be connected in oil return branch road described oil return main road on corresponding with each work connection, described oil-feed main road is communicated with the actuator port of described Proportional valve, and described oil-feed branch road and oil return branch road join corresponding connection with each work respectively.
Further, the actuator port of described Proportional valve only has one to participate in described load-sensitive hydraulic system.
Further, the control mode of described Proportional valve is automatically controlled, hydraulic control or manually controls.
On the other hand, the invention also discloses a kind of engineering machinery, described engineering machinery is provided with load-sensitive hydraulic system described above.
Further, described engineering machinery comprises hoist.
With respect to prior art, the utlity model has following advantage:
1, load-sensitive hydraulic system described in the utility model is optionally provided with pressure-compensated valve piece before the selector valve valve of each work connection, the work connection that need to carry out composite move is arranged to pressure compensation, can carry out flow demand assigned composite move, work connection without composite move does not arrange pressure compensation, and then the cost that the pressure compensation of solution redundancy causes increases problem.
2, load-sensitive hydraulic system described in the utility model adopts a proportional valve control system total discharge, again with each work connection of selector valve control, no matter reach mechanism's single movement or composite move, flow can be provided as required, the general application not high to speed governing performance requirement, can substitute load-sensitive proportional multi-way valve, solve multiple proportional control ports and cause controlling complicated and cost increase problem.
3, load-sensitive hydraulic system described in the utility model is also provided with extendible oil circuit module, increase work easily connection, and pressure-compensated valve piece is modular design, can be attached to as required each work connection, so just can reach expansion flexibly, improve the object of universal component rate.
Brief description of the drawings
The accompanying drawing that forms a part of the present utility model is used to provide further understanding of the present utility model, 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 the hydraulic principle schematic diagram of the load-sensitive hydraulic system described in the present embodiment.
Description of reference numerals:
1-variable displacement pump, 2-proportional reversing valve, 3-the first work connection, 4-the second work connection, 5-oil circuit module, 6-pressure-compensated valve piece, 7-selector valve, 8-actuator, 9-adjustable restrictive valve, 10-pressure reduction reduction valve.
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 1 is the hydraulic principle schematic diagram of the present embodiment, and as shown in FIG., this load-sensitive hydraulic system comprises variable displacement pump 1, proportional reversing valve 2, the first work connection 3, the second work connection 4, oil circuit module 5 and pressure-compensated valve piece 6.This proportional reversing valve 2 is two-position four-way solenoid valve, but its actuator port only has a participation system, and another shutoff need not.The first work connection 3 and the second work connection 4 include the 8(of actuator oil cylinder, oil hydraulic motor etc.) and for controlling the selector valve 7 of this actuator 8, and this pressure-compensated valve piece 6 is connected on the oil-feed oil circuit of selector valve 7 of the second work connection 4.This oil circuit module 5 is an open-ended modularity structure, comprises oil-feed main road, oil return main road, be connected in oil-feed branch road this oil-feed main road on and with each work join corresponding be connected in oil return branch road this oil return main road on corresponding with each work connection.This pressure-compensated valve piece 6 is also a modular construction, comprise pressure reduction reduction valve 10 and the adjustable restrictive valve 9 of series connection, this adjustable restrictive valve 9 is connected on the oil circuit at these pressure reduction reduction valve 10 oil outlet places, pressure reduction reduction valve 10 plays pressure compensation effect, be placed on before adjustable restrictive valve 9, by regulating adjustable restrictive valve 9, second work that can meet joins 4 different traffic demands, and this is just equivalent to an easy valve precompensation load-sensitive proportional multi-way valve.
In the load-sensitive hydraulic system described in the present embodiment, the oil inlet P of this proportional reversing valve 2 is communicated with the oil outlet P of this variable displacement pump, the actuator port A of this proportional reversing valve 2 is communicated with the oil inlet P of the load-sensitive mouth Ls of this variable displacement pump 1 and the oil-feed main road of oil circuit module 5 simultaneously, by the openings of sizes of control ratio selector valve 2, just can export a regime flow that is not subject to load effect by controlled variable pump 1 like this; Each oil-feed branch road of this oil circuit module 5 is communicated with the oil inlet P of selector valve 7 of the first work connection 3 and the filler opening of the pressure reduction reduction valve 10 of the second work connection 4 respectively, each oil return branch road of this oil circuit module 5 is communicated with the oil return inlet T of the selector valve 7 of the first work connection 3 and the second work connection 4 respectively, and the hydraulic fluid port T of the oil return main road of this oil circuit module 5 and the oil return inlet T of proportional reversing valve 2 all take back fuel tank.
In the present embodiment, if the first work connection 3 also needs to carry out composite move, only need on the oil-feed oil circuit of the selector valve 7 of the first work connection 3, install a pressure-compensated valve piece 6 additional just; If desired expand the even more work connection of the 3rd work connection, only need expansion oil circuit module 5 just can install more work connection additional, and then install as required pressure-compensated valve piece 6 additional, expand very flexible.
Load-sensitive hydraulic system described in the present embodiment has following advantage:
1, the load-sensitive hydraulic system described in the present embodiment is optionally provided with pressure-compensated valve piece before the selector valve valve of each work connection, the work connection that need to carry out composite move is arranged to pressure compensation, can carry out flow demand assigned composite move, work connection without composite move does not arrange pressure compensation, and then the cost that the pressure compensation of solution redundancy causes increases problem.
2, the load-sensitive hydraulic system described in the present embodiment adopts a proportional valve control system total discharge, again with each work connection of selector valve control, no matter reach mechanism's single movement or composite move, flow can be provided as required, the general application not high to speed governing performance requirement, can substitute load-sensitive proportional multi-way valve, solve multiple proportional control ports and cause controlling complicated and cost increase problem.
3, the load-sensitive hydraulic system described in the present embodiment is also provided with extendible oil circuit module, increase work easily connection, and pressure-compensated valve piece is modular design, can be attached to as required each work connection, so just can reach expansion flexibly, improve the object of universal component rate.
In other embodiments, this adjustable restrictive valve also can be connected on the oil circuit at this pressure reduction reduction valve filler opening place, this proportional reversing valve can also be proportional throttle valve, and its control mode can also be controlled for hydraulic control or manually, and pressure reduction reduction valve can be also other forms of pressure reduction open valve.
Except above-mentioned load-sensitive hydraulic system, the utility model also provides a kind of engineering machinery that is provided with above-mentioned load-sensitive hydraulic system, and as hoist etc., the structure of other each several part of this project machinery, with reference to prior art, repeats no more herein.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (9)
1. a load-sensitive hydraulic system, it is characterized in that, comprise variable displacement pump (1), Proportional valve and at least two work connection, each work connection includes actuator (8) and for controlling the selector valve (7) of this actuator (8), the filler opening of described Proportional valve is communicated with the oil outlet of described variable displacement pump (1), the actuator port of described Proportional valve is communicated with the filler opening of the load-sensitive mouth of described variable displacement pump (1) and the selector valve (7) of each work connection simultaneously, the return opening of the selector valve (7) of the return opening of described Proportional valve and each work connection all takes back fuel tank, on the oil-feed oil circuit of the selector valve (7) joining in each work, be optionally in series with pressure-compensated valve piece (6).
2. load-sensitive hydraulic system according to claim 1, it is characterized in that, described pressure-compensated valve piece (6) comprises pressure reduction open valve and the adjustable restrictive valve (9) of series connection, and described adjustable restrictive valve (9) is arranged on the oil circuit at oil outlet place of described pressure reduction open valve or on the oil circuit at filler opening place.
3. load-sensitive hydraulic system according to claim 2, is characterized in that, described pressure reduction open valve comprises pressure reduction reduction valve (10).
4. load-sensitive hydraulic system according to claim 2, is characterized in that, described Proportional valve is proportional reversing valve (2) or proportional throttle valve.
5. according to the load-sensitive hydraulic system described in claim 3 or 4, it is characterized in that, oil circuit between described Proportional valve and each work connection comprises an extendible oil circuit module (5), described oil circuit module (5) comprises oil-feed main road, oil return main road, corresponding with each work connection is connected in the oil-feed branch road on described oil-feed main road in parallel and joins the corresponding oil return branch road on described oil return main road that is connected in parallel with each work, described oil-feed main road is communicated with the actuator port of described Proportional valve (2), described oil-feed branch road and oil return branch road join corresponding connection with each work respectively.
6. load-sensitive hydraulic system according to claim 4, is characterized in that, the actuator port of described Proportional valve only has one to participate in described load-sensitive hydraulic system.
7. load-sensitive hydraulic system according to claim 4, is characterized in that, the control mode of described Proportional valve is automatically controlled, hydraulic control or manually controls.
8. an engineering machinery, is characterized in that, described engineering machinery is provided with load-sensitive hydraulic system as described in claim 1 to 7 any one.
9. engineering machinery according to claim 8, is characterized in that, described engineering machinery comprises hoist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320875170.5U CN203702696U (en) | 2013-12-27 | 2013-12-27 | Load-sensitive hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320875170.5U CN203702696U (en) | 2013-12-27 | 2013-12-27 | Load-sensitive hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
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| CN203702696U true CN203702696U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320875170.5U Expired - Fee Related CN203702696U (en) | 2013-12-27 | 2013-12-27 | Load-sensitive hydraulic system and engineering machinery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402176A (en) * | 2015-10-26 | 2016-03-16 | 徐州重型机械有限公司 | Parallel hydraulic control system and crane using parallel hydraulic control system |
| CN105840574A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Load-sensitive multi-way valve and hydraulic system of engineering machine |
| CN106081914A (en) * | 2016-08-19 | 2016-11-09 | 徐州重型机械有限公司 | Load sensitive system, Ioad-sensing control method and crane |
| CN110905870A (en) * | 2019-12-09 | 2020-03-24 | 柳州柳工液压件有限公司 | Load sensitive hydraulic system |
-
2013
- 2013-12-27 CN CN201320875170.5U patent/CN203702696U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840574A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Load-sensitive multi-way valve and hydraulic system of engineering machine |
| CN105840574B (en) * | 2015-01-16 | 2018-04-06 | 徐工集团工程机械股份有限公司 | Load sensing multi-way valve and construction machinery hydraulic system |
| CN105402176A (en) * | 2015-10-26 | 2016-03-16 | 徐州重型机械有限公司 | Parallel hydraulic control system and crane using parallel hydraulic control system |
| CN106081914A (en) * | 2016-08-19 | 2016-11-09 | 徐州重型机械有限公司 | Load sensitive system, Ioad-sensing control method and crane |
| CN110905870A (en) * | 2019-12-09 | 2020-03-24 | 柳州柳工液压件有限公司 | Load sensitive hydraulic system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20171227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |