CN202182071U - Engineering mechanical load sensing hydraulic system - Google Patents
Engineering mechanical load sensing hydraulic system Download PDFInfo
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- CN202182071U CN202182071U CN2011202327857U CN201120232785U CN202182071U CN 202182071 U CN202182071 U CN 202182071U CN 2011202327857 U CN2011202327857 U CN 2011202327857U CN 201120232785 U CN201120232785 U CN 201120232785U CN 202182071 U CN202182071 U CN 202182071U
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Abstract
An engineering mechanical load sensing hydraulic system has the advantages that a hydraulic pump is a constant delivery pump, and a change valve in a multi-way valve is a mid-way blocking change valve. The engineering mechanical load sensing hydraulic system is provided with a tee joint pressure equalizer and a no-load unloading valve, and a guide control portion is provided with a logical valve and an unloading valve. The engineering mechanical load sensing hydraulic system has the advantages of adopting quantitative load backfeed technology, redundant flow opens an overflow oil return tank through the tee joint pressure equalizer according to pressure needed by a system to overcome actual load, system overflow pressure is changes along changes of the maximum load borne by an executive component, energy-saving effects of a bulldozer hydraulic system are strengthened. When each valve rod of the mid-way blocking change valve is in a mid-way state, an L opening signal oil way of the no-load unloading valve reflows the oil tank through a valve plug mid-way passage, the no-load unloading valve is opened completely at the time, a P1 pipeline oil way is unloaded under low pressure, and energy-saving effects of a quantitative load sensing multi-way valve when the quantitative load sensing multi-way valve is located in the mid way are guaranteed. The logical valve and the unloading valve are arranged on a guide oil source valve block, so that guide overflow pressure is greatly reduced, and energy loss of the guide control portion is reduced.
Description
Technical field
The utility model relates to a kind of engineering machinery that is applicable to, is specially adapted to the engineering machinery load sensing hydraulic system of bulldozer.
Background technique
The hydraulic system of engineering machinery bulldozer in the past all is out each action of meta multiple directional control valve control.Be characterized in: during the Joystick attonity, the hydraulic oil that working pump provides is through the direct oil sump tank of multi-way valve; During the Joystick action; Actions such as the up-down of bulldozer perching knife, perching knife inclination, ridge buster up-down and inclination have been realized; Because the parallel connection of each loop, system pressure confirm by overcoming the required pressure of maximum load, overflow back fuel tank than hour causing main safety valve to open by rated pressure in multi-way valve valve rod aperture efficiency; It is bigger that system produces the pressure loss, causes energy loss and cause system's heating.
The hydraulic system of engineering machinery bulldozer in the past all adopts direct-acting overflow valve control guide oil supply pressure.Be characterized in: guide's oil supply pressure is by the decision of the setting pressure of direct-acting overflow valve, guide's handle be failure to actuate or operating angle hour, pilot pressure oil is at this pressure underflow stream oil sump tank, the pressure loss is bigger, causes energy loss and causes system's heating.
The model utility content
The purpose of the utility model just provides a kind of employing fixed quantitative load feedback technique; System only offers the required flow of executive component; Unnecessary flow overcomes the required pressure of actual loading through the three-way pressure compensating device by system and opens and overflow back fuel tank; The maximum load that system's oil pressure relief receives along with executive component changes and changes; Strengthen the energy-saving effect of bulldozer hydraulic system very significantly, significantly reduced guide's oil pressure relief, reduced the engineering machinery load sensing hydraulic system of the energy loss of guide's control section.
The solution of the utility model is such: oil hydraulic pump is a metering pump; The hydraulic fluid port of described multi-way valve comprises P1 mouth, LS mouth, T1 mouth, T2 mouth and LSU mouth, and the selector valve in the multi-way valve is for closing middle way reversing valve; Have three-way pressure compensating device and unloaded unloading valve; The K mouth of described three-way pressure compensating device is communicated with the LS mouth of multi-way valve; H mouth and filler opening are to be communicated with the P1 mouth of multi-way valve, and oil outlet is to be communicated with the T1 mouth of multi-way valve, and the C mouth of described unloaded unloading valve is communicated with the P1 mouth of multi-way valve; The D mouth and the filler opening of unloaded unloading valve are communicated with the T1 mouth of multi-way valve; This technological scheme constitutes the load sensing device that closes the meta load-sensing valve, and system only offers the required flow of executive component, and unnecessary flow overcomes the required pressure of actual loading through the three-way pressure compensating device by system and opens and overflow back fuel tank.
Also have the servo-actuated spool, the LS1 mouth of servo-actuated spool is communicated with the LS mouth of multi-way valve, and the LS2 mouth of servo-actuated spool is communicated with the P1 mouth of multi-way valve, and the LS3 mouth of servo-actuated spool is communicated with the J mouth of selector valve.
The hydraulic fluid port of guide's oil sources valve piece of guide's control section comprises P2 mouth, Ac mouth, P3 mouth and T mouth, has logical valve and unloading valve in the valve, and the F mouth of unloading valve is communicated with the E mouth of logical valve; The G mouth of unloading valve is communicated with the P3 mouth of guide's oil sources valve piece, take technique scheme after, significantly reduce guide's oil pressure relief.
Described three-way pressure compensating device is installed in the multi-way valve.
Described unloaded unloading valve is mounted in the multi-way valve.
Described servo-actuated spool is mounted in the multi-way valve.
Described oil hydraulic pump is the duplex metering pump, and a metering pump is to connecting with multi-way valve, and another metering pump is connected with guide's oil sources valve piece.
The utility model has the advantages that and adopt the fixed quantitative load feedback technique; System only offers the required flow of executive component; Unnecessary flow overcomes the required pressure of actual loading through the three-way pressure compensating device by system and opens and overflow back fuel tank; The maximum load that system's oil pressure relief receives along with executive component changes and changes, and has strengthened the energy-saving effect of bulldozer hydraulic system very significantly; When each valve rod of position switching valve all is in the meta state in closing; The L mouth signal oil circuit of unloaded unloading valve is through spool meta channel flow oil sump tank; This moment, unloaded unloading valve was opened fully, and low pressure off-load P1 pipeline oil circuit has guaranteed the energy-saving effect when fixed quantitative load sensing multi-way valve is in meta.On the valve piece of guide oil source, logical valve and unloading valve are set, significantly reduce guide's oil pressure relief, reduced the energy loss of guide's control section.
Description of drawings
Accompanying drawing is the embodiment of the utility model.
Accompanying drawing 1 is a complete hydraulic system principle figure among the embodiment of the utility model.
Accompanying drawing 2 is multi-way valve control unit schematic representation among the embodiment of the utility model.
Accompanying drawing 3 is guide's oil sources valve block control unit schematic representation among the embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
Shown in accompanying drawing 1; By oil hydraulic pump to multi-way valve 4 and guide's control section fuel feeding; Each hydraulic pressure power unit work of multi-way valve 4 controls, the work of every road executive component is controlled by selector valve 8 separately, and described oil hydraulic pump is the duplex metering pump; A metering pump is to connecting with multi-way valve 4, and another metering pump is connected with guide's oil sources valve piece 1.The hydraulic fluid port of described multi-way valve 4 comprises P1 mouth, LS mouth, T1 mouth, T2 mouth and LSU mouth, and the selector valve 8 in the multi-way valve 4 is for closing middle way reversing valve.
Shown in accompanying drawing 1 and accompanying drawing 2; The utlity model has three-way pressure compensating device 6 and unloaded unloading valve 5; The K mouth of described three-way pressure compensating device 6 is communicated with the LS mouth of multi-way valve 4, and H mouth and filler opening are to be communicated with the P1 mouth of multi-way valve 4, and oil outlet is to be communicated with the T1 mouth of multi-way valve 4; The C mouth of described unloaded unloading valve 5 is communicated with the P1 mouth of multi-way valve 4, and the D mouth of unloaded unloading valve 5 and filler opening are communicated with the T1 mouth of multi-way valve 4.Also has servo-actuated spool 7; The LS1 mouth of servo-actuated spool 7 is communicated with the LS mouth of multi-way valve 4, and the LS2 mouth of servo-actuated spool 7 is communicated with the P1 mouth of multi-way valve 4, and the LS3 mouth of servo-actuated spool 7 is communicated with the J mouth of selector valve (8); Servo-actuated spool 7 has the function of duplicating load signal, can avoid the little sinking of load.
In the present embodiment, described three-way pressure compensating device 6, unloaded unloading valve 5 and servo-actuated spool 7 are installed in the multi-way valve 4.
With shown in the accompanying drawing 3, the hydraulic fluid port of guide's oil sources valve piece 1 of described guide's control section comprises P2 mouth, Ac mouth, P3 mouth and T mouth like accompanying drawing 1, has logical valve 3 and unloading valve 2 in the valve, and the F mouth of unloading valve 2 is communicated with the E mouth of logical valve 3; The G mouth of unloading valve 2 is communicated with the P3 mouth of guide's oil sources valve piece 1.
The working principle of the utility model is following:
Working procedure has following several kinds:
1. when multi-way valve 4 is failure to actuate; The zero load feedback signal of LS oil circuit; LS signal oil circuit is through the very little load signal floss hole oil sump tank of flow; The L mouth of unloaded unloading valve 5 is communicated with fuel tank through the path of spool meta, and the C mouth pressure is reduced to unloaded unloading valve 5 spring setting pressures, with extremely low pressure off-load.The oil of gear pump is from unloaded unloading valve oil sump tank at this moment, and because of the cracking pressure of spring is very little, so the pressure loss that causes is also very little, this moment is similar with the middle position switching valve of opening of traditional bulldozer employing, i.e. the fluid of metering pump discharge directly flows back to fuel tank.
2. when single group oil cylinder moves; Because selector valve 8 spools action; The induced pressure of executive component passes to the LS3 mouth of servo-actuated spool 7 through the J mouth of selector valve 8, and the servo-actuated spool moves down, and passes to the LS oil circuit after the LS2 mouth decompression of system pressure P1 through servo-actuated spool 7; Act on the K mouth of three-way pressure compensating device 6, this pressure is equivalent to induced pressure; Because a little higher than induced pressure of P1 pressure, and, remove the unsupported cracking pressure that reaches safety valve, otherwise can under the rated pressure of system, not open overflow, significantly reduced the pressure loss of system along with the change in pressure of load.
3. when guide's handle was failure to actuate, gear pump outlet pressure P2 rose, and when P2 surpassed the setting pressure of unloading valve 2 of guide's oil sources valve piece, unloading valve 2 was opened, and the E mouth of logical valve 3 is communicated to fuel tank through the F mouth of unloading valve 2.At this moment, the input pressure P2 of logical valve 3 surpasses its spring setting pressure, and gear pump is fuel-displaced to pass through logical valve 3 overflows to fuel tank.This pressure is reduced to logical valve 3 spring setting pressures, far below unloading valve 2 setting pressures and gear pump relief valve pressure, has significantly reduced the energy loss of guide's control section.
Claims (7)
1. engineering machinery load sensing hydraulic system, to multi-way valve (4) and guide's control section fuel feeding, multi-way valve (4) is controlled each hydraulic pressure power unit work by oil hydraulic pump, it is characterized in that described oil hydraulic pump is a metering pump; The hydraulic fluid port of described multi-way valve (4) comprises P1 mouth, LS mouth, T1 mouth, T2 mouth and LSU mouth, and the selector valve (8) in the multi-way valve (4) is for closing middle way reversing valve; Have three-way pressure compensating device (6) and unloaded unloading valve (5); The K mouth of described three-way pressure compensating device (6) is communicated with the LS mouth of multi-way valve (4); H mouth and filler opening are to be communicated with the P1 mouth of multi-way valve (4); Oil outlet is to be communicated with the T1 mouth of multi-way valve (4), and the C mouth of described unloaded unloading valve (5) is communicated with the P1 mouth of multi-way valve (4), and the D mouth of unloaded unloading valve (5) and filler opening are communicated with the T1 mouth of multi-way valve (4).
2. engineering machinery load sensing hydraulic system according to claim 1; It is characterized in that also having servo-actuated spool (7); The LS1 mouth of servo-actuated spool (7) is communicated with the LS mouth of multi-way valve (4); The LS2 mouth of servo-actuated spool (7) is communicated with the P1 mouth of multi-way valve (4), and the LS3 mouth of servo-actuated spool (7) is communicated with the J mouth of selector valve (8).
3. engineering machinery load sensing hydraulic system according to claim 1; The hydraulic fluid port that it is characterized in that guide's oil sources valve piece (1) of described guide's control section comprises P2 mouth, Ac mouth, P3 mouth and T mouth; Have logical valve (3) and unloading valve (2) in the valve, the F mouth of unloading valve (2) is communicated with the E mouth of logical valve (3); The G mouth of unloading valve (2) is communicated with the P3 mouth of guide's oil sources valve piece (1).
4. engineering machinery load sensing hydraulic system according to claim 1 is characterized in that described three-way pressure compensating device (6) is installed in the multi-way valve (4).
5. engineering machinery load sensing hydraulic system according to claim 1 is characterized in that described unloaded unloading valve (5) is mounted in the multi-way valve (4).
6. engineering machinery load sensing hydraulic system according to claim 2 is characterized in that described servo-actuated spool (7) is mounted in the multi-way valve (4).
7. engineering machinery load sensing hydraulic system according to claim 1 is characterized in that described oil hydraulic pump is the duplex metering pump, and a metering pump is to connecting with multi-way valve (4), and another metering pump is connected with guide's oil sources valve piece (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202327857U CN202182071U (en) | 2011-07-05 | 2011-07-05 | Engineering mechanical load sensing hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202327857U CN202182071U (en) | 2011-07-05 | 2011-07-05 | Engineering mechanical load sensing hydraulic system |
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| Publication Number | Publication Date |
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| CN202182071U true CN202182071U (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202327857U Expired - Fee Related CN202182071U (en) | 2011-07-05 | 2011-07-05 | Engineering mechanical load sensing hydraulic system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251996A (en) * | 2011-07-05 | 2011-11-23 | 天津柳工机械有限公司 | Engineering mechanical load sensing hydraulic system |
| CN102878128A (en) * | 2012-09-19 | 2013-01-16 | 浙江大学 | Hydraulic system of construction machine |
| CN103206423A (en) * | 2013-04-17 | 2013-07-17 | 三一重机有限公司 | Hydraulic system and engineering machine |
| CN103807240A (en) * | 2012-11-14 | 2014-05-21 | 柳州柳工挖掘机有限公司 | Priority system and priority device on pilot hydraulic control oil circuit |
| CN110603384A (en) * | 2018-03-28 | 2019-12-20 | 株式会社日立建机Tierra | Hydraulic drive device for construction machine |
-
2011
- 2011-07-05 CN CN2011202327857U patent/CN202182071U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251996A (en) * | 2011-07-05 | 2011-11-23 | 天津柳工机械有限公司 | Engineering mechanical load sensing hydraulic system |
| CN102878128A (en) * | 2012-09-19 | 2013-01-16 | 浙江大学 | Hydraulic system of construction machine |
| CN102878128B (en) * | 2012-09-19 | 2015-02-25 | 浙江大学 | Hydraulic system of construction machine |
| CN103807240A (en) * | 2012-11-14 | 2014-05-21 | 柳州柳工挖掘机有限公司 | Priority system and priority device on pilot hydraulic control oil circuit |
| CN103206423A (en) * | 2013-04-17 | 2013-07-17 | 三一重机有限公司 | Hydraulic system and engineering machine |
| CN103206423B (en) * | 2013-04-17 | 2015-09-02 | 三一重机有限公司 | A kind of hydraulic system and engineering machinery |
| CN110603384A (en) * | 2018-03-28 | 2019-12-20 | 株式会社日立建机Tierra | Hydraulic drive device for construction machine |
| CN110603384B (en) * | 2018-03-28 | 2021-02-23 | 株式会社日立建机Tierra | Hydraulic drive device for construction machine |
| US11214940B2 (en) | 2018-03-28 | 2022-01-04 | Hitachi Construction Machinery Tierra Co., Ltd. | Hydraulic drive system for construction machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180612 Address after: 213168 588 Yancheng South Road, Wujin hi tech Industrial Development Zone, Changzhou, Jiangsu Co-patentee after: Guangxi Liugong Machinery Co., Ltd. Patentee after: LIUGONG CHANGZHOU MACHINERY CO., LTD. Address before: 300300 Tianjin Airport Economic Zone, Dongli District, Tianjin, No. 203, No. three road. Co-patentee before: Guangxi Liugong Machinery Co., Ltd. Patentee before: Tianjin Liugong Machinery Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20190705 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |