CN103774707A - Hydraulic system for working device of land leveller - Google Patents
Hydraulic system for working device of land leveller Download PDFInfo
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- CN103774707A CN103774707A CN201410032657.6A CN201410032657A CN103774707A CN 103774707 A CN103774707 A CN 103774707A CN 201410032657 A CN201410032657 A CN 201410032657A CN 103774707 A CN103774707 A CN 103774707A
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- perching knife
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Abstract
The invention discloses a hydraulic system for a working device of a land leveller. The hydraulic system comprises an oil tank, a metering pump, a pressure-gradient control valve, a six-way multitandem valve, a prefill valve, a load-sensitive variable pump, a shuttle valve and a load-sensitive multitandem valve; two oil inlets of the shuttle valve are communicated with a load-sensitive port of the load-sensitive multitandem valve and an oil outlet of a service braking loop on the land leveller respectively; the oil outlet of the shuttle valve is communicated with a control port of the load-sensitive variable pump. According to the hydraulic system, the work efficiency is high, the composite action capacity of each actuating element in the land leveller is high, and the cost is low.
Description
Technical field
The present invention relates to a kind of hydraulic system, be specifically related to a kind of hydraulic system of land leveler operating device.
Background technology
Land leveller is a kind of earthmoving equipment, mainly utilizes perching knife to carry out large-area Land leveling operation, the function such as in addition, some land levellers have also added loading, compacting, open ice, snow removing.Perching knife is the groundwork device of land leveller, draws oil cylinder, shovel angular transformation oil cylinder, perching knife show oil cylinder, its action of perching knife rotary motor control by perching knife left and right hoist cylinder, perching knife.For adapting to different operating modes, land leveller also has articulation steering, front-wheel tilts, bulldozes, harrows the functions such as soil, and these move respectively by articulation steering oil cylinder, front-wheel dump ram, front ejector dozer hoist cylinder, the control of rear ridge buster hoist cylinder.
In known technology, land leveler operating device hydraulic system generally adopts the discharge capacity constant displacement pumps such as two or single constant displacement pump to join synchronous valve to form two equivalent oil circuits, adopts the executive components such as two group of six logical multiple directional control valve (4 or 5) control hydraulic cylinder and motor; Minority land leveller makes single load-reacting pump, adopts two groups of load sensing multi-way valves (4 or 5) to control the executive components such as hydraulic cylinder and motor.Mainly there are the following problems for they: first, the system that pumping source all adopts constant displacement pump with the little Output pressure of large flow, produces certain power loss in the time of standby; In operation adjustment process, not only may produce restriction loss but also may produce spill losses, overall power loss is larger, and system effectiveness is low.Secondly, the output flow of constant displacement pump is only that revolution speed is relevant with engine speed, and Throttle Opening Control rotating speed or armrest scapus stream all can carry out speed governing to executive component, and engine speed and actuator movement speed are not independent, equipment speed is relatively wayward, and maneuverability is poor.Finally, it is poor that Constant Pump System realizes composite move ability, because land leveller has multi executors, and in the time handling the oil cylinder that is connected with homonymy constant displacement pump or motor and carry out composite move, the speed when maximal rate of actuator is less than its self contained function.In addition, in the time that load is uneven, fluid is first carried out low load, then carries out high capacity, easily causes action distortion.The simultaneously current buying of load-reacting pump and load sensing multi-way valve is mainly from external import, and price is relatively costly compared with Constant Pump System, and maintenance complexity is higher than Constant Pump System.Land leveller has the feature of multi-execution component, all adopts load sensing multi-way valve control greatly to increase element purchase cost and maintenance difficulty.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of hydraulic system of land leveler operating device is provided, this system effectiveness is high, and in land leveller, the composite move ability of each executive component is strong, and cost is low.
For achieving the above object, the hydraulic system of land leveler operating device of the present invention comprises fuel tank, constant displacement pump, pressure-gradient control valve, six logical banked direction control valves, prefill valve, load-reacting pump, shuttle valve and load sensing multi-way valve;
Described fuel tank is provided with two oil-outs, two oil-outs on fuel tank are connected with the oiler of constant displacement pump and the oiler of load-reacting pump respectively, the oil-out of constant displacement pump is connected with the oiler of pressure-gradient control valve, two oil-outs on pressure-gradient control valve get on to turn to the oiler in loop to be connected with oiler and the land leveller of main valve in six logical banked direction control valves respectively, in six logical banked direction control valves, the oil-out of main valve and the oiler of fuel tank are connected, five secondary valves in six logical banked direction control valves respectively with the rear ridge buster hoist cylinder of land leveller, articulation steering oil cylinder, front-wheel dump ram, oil cylinder shown by perching knife and front ejector dozer hoist cylinder is connected, the oil-out of load-reacting pump is connected with the oiler of prefill valve, two oil-outs on prefill valve are connected with the get on oiler in service brake loop of the oiler of main valve in load sensing multi-way valve and land leveller respectively, in load sensing multi-way valve, the oil-out of main valve and the oiler of fuel tank are connected, five secondary valves in load sensing multi-way valve respectively with land leveller in perching knife rotary motor, shovel angular transformation oil cylinder, perching knife is drawn oil cylinder, the left hoist cylinder of perching knife and the right hoist cylinder of perching knife are connected,
Two oilers on described shuttle valve are connected with the oil-out that comes bicycle brake loop on load-sensitive mouth and the land leveller of load sensing multi-way valve respectively, and the oil-out of shuttle valve is connected with the control port of load-reacting pump.
Secondary valve in described six logical banked direction control valves is connected by the first equalizing valve with the rear ridge buster hoist cylinder in land leveller.
Secondary valve in described six logical banked direction control valves is connected by the second equalizing valve with the front ejector dozer hoist cylinder in land leveller.
Secondary valve in described load sensing multi-way valve is connected by the 3rd equalizing valve with the left hoist cylinder of perching knife in land leveller.
Secondary valve in described load sensing multi-way valve is connected by the 4th equalizing valve with the right hoist cylinder of perching knife in land leveller.
Secondary valve in described load sensing multi-way valve is connected by overflow valve with the perching knife rotary motor in land leveller.
An oil-out on described fuel tank is connected with the oiler of constant displacement pump by the first oil filter, and another oil-out on fuel tank is connected with the oiler of load-reacting pump by the second oil filter.
The present invention has following beneficial effect:
The hydraulic system of land leveler operating device of the present invention in the course of the work, due to perching knife rotary motor on land leveller, shovel angular transformation oil cylinder, perching knife is drawn oil cylinder, the frequency that the right hoist cylinder of the left hoist cylinder of perching knife and perching knife uses is high, therefore carry out fuel feeding by load-reacting pump, load-reacting pump has the function of load-sensitive, in operating process, load-reacting pump is by perching knife rotary motor on load sensing multi-way valve and land leveller, shovel angular transformation oil cylinder, perching knife is drawn oil cylinder, the left hoist cylinder of perching knife and the right hoist cylinder of perching knife are connected, by shuttle valve by larger pressure feedback in the control port of load-reacting pump, thereby the effect of the Flow-rate adjustment of getting up, load-reacting pump is only exported the required flow of executive component and pressure in the course of the work, there is no the loss of flow, operating efficiency is high, when standby, energy consumption is little, simultaneously in the time carrying out composite move by multiple executive components of load-reacting oil pump feed, load-reacting pump is by feedback pressure adjust flux, the supply capability of the responsive variable pump of proof load, in the time occurring that flow is saturated, because load sensing multi-way valve has pressure compensation effect, each executive component speed declines in proportion, avoid executive component to carry out by the descending order of load, guarantee that each executive component composite move is indeformable, convenient operation and control, be beneficial to the precision that strikes off that improves land leveller.Due to ridge buster hoist cylinder, articulation steering oil cylinder, front-wheel dump ram, perching knife after on land leveller, to show five executive component frequencies of utilization of oil cylinder and front ejector dozer hoist cylinder low in addition, relatively low to required precision, therefore directly carry out fuel feeding by constant displacement pump and six logical banked direction control valves, thereby effectively reduce cost.In the time that one of five executive components by constant displacement pump fuel feeding carry out composite move with load-reacting pump one side executive component, composite move can normally carry out.Show machine as more typical perching knife in company with hitch frame and brush slope operation outward, because two self contained functions are respectively by oil sources fuel feeding separately, therefore can not exert an influence to this composite move.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein, 1 is the first oil filter, 2 is the second oil filter, 3 is constant displacement pump, 4 is load-reacting pump, 5 is prefill valve, 6 is pressure-gradient control valve, 7 is shuttle valve, 8 is six logical banked direction control valves, 9 is load sensing multi-way valve, 10 is rear ridge buster hoist cylinder, 11 is articulation steering oil cylinder, 12 is front-wheel dump ram, 13 show oil cylinder for perching knife, 14 is front ejector dozer hoist cylinder, 15 is perching knife rotary motor, 16 is shovel angular transformation oil cylinder, 17 draw oil cylinder for perching knife, 18 is the left hoist cylinder of perching knife, 19 is the right hoist cylinder of perching knife, 20 is the first equalizing valve, 21 is the second equalizing valve, 22 is overflow valve, 23 is the 3rd equalizing valve, 24 is the 4th equalizing valve, 25 is fuel tank.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the hydraulic system of land leveler operating device of the present invention comprises fuel tank 25, constant displacement pump 3, pressure-gradient control valve 6, six logical banked direction control valves 8, prefill valve 5, load-reacting pump 4, shuttle valve 7 and load sensing multi-way valve 9;
Described fuel tank 25 is provided with two oil-outs, two oil-outs on fuel tank 25 are connected with the oiler of constant displacement pump 3 and the oiler of load-reacting pump 4 respectively, the oil-out of constant displacement pump 3 is connected with the oiler of pressure-gradient control valve 6, two oil-outs on pressure-gradient control valve 6 get on to turn to the oiler in loop to be connected with oiler and the land leveller of main valve in six logical banked direction control valves 8 respectively, in six logical banked direction control valves 8, the oil-out of main valve is connected with the oiler of fuel tank 25, five secondary valves in six logical banked direction control valves 8 respectively with the rear ridge buster hoist cylinder 10 of land leveller, articulation steering oil cylinder 11, front-wheel dump ram 12, oil cylinder 13 shown by perching knife and front ejector dozer hoist cylinder 14 is connected, the oil-out of load-reacting pump 4 is connected with the oiler of prefill valve 5, two oil-outs on prefill valve 5 are connected with the get on oiler in service brake loop of the oiler of main valve in load sensing multi-way valve 9 and land leveller respectively, in load sensing multi-way valve 9, the oil-out of main valve is connected with the oiler of fuel tank 25, five secondary valves in load sensing multi-way valve 9 respectively with land leveller in perching knife rotary motor 15, shovel angular transformation oil cylinder 16, perching knife is drawn oil cylinder 17, the left hoist cylinder 18 of perching knife and the right hoist cylinder 19 of perching knife are connected, two oilers on shuttle valve 7 are connected with the oil-out that comes bicycle brake loop on load-sensitive mouth and the land leveller of load sensing multi-way valve 9 respectively, the oil-out of shuttle valve 7 is connected with the control port of load-reacting pump 4.
Secondary valve in described six logical banked direction control valves 8 is connected by the first equalizing valve 20 with the rear ridge buster hoist cylinder 10 in land leveller; Secondary valve in six logical banked direction control valves 8 is connected by the second equalizing valve 21 with the front ejector dozer hoist cylinder 14 in land leveller; Secondary valve in load sensing multi-way valve 9 is connected by the 3rd equalizing valve 23 with the left hoist cylinder 18 of the perching knife in land leveller; Secondary valve in load sensing multi-way valve 9 is connected by the 4th equalizing valve 24 with the right hoist cylinder 19 of the perching knife in land leveller; Secondary valve in load sensing multi-way valve 9 is connected by overflow valve 22 with the perching knife rotary motor 15 in land leveller; An oil-out on fuel tank 25 is connected with the oiler of constant displacement pump 3 by the first oil filter 1, and another oil-out on fuel tank 25 is connected with the oiler of load-reacting pump 4 by the second oil filter 2.
Specific works process of the present invention is:
Described constant displacement pump 3 and load-reacting pump 4 are from the interior extraction oil of fuel tank 25, constant displacement pump 3 is input to oil in six logical banked direction control valves 8 through pressure-gradient control valve 6, ridge buster hoist cylinder 10 after being connected with six logical banked direction control valves 8, articulation steering oil cylinder 11, front-wheel dump ram 12, when perching knife is shown in oil cylinder 13 and front ejector dozer hoist cylinder 14 any one executive component work, open the secondary valve in the six logical banked direction control valves 8 that executive component is corresponding, thereby make oil enter into the executive component of unlatching, thereby make executive component work, load-reacting pump 4 enters into load sensing multi-way valve 9 by oil through prefill valve 5, when the perching knife rotary motor 15 being connected with load sensing multi-way valve 9, shovel angular transformation oil cylinder 16, perching knife is drawn oil cylinder 17, when in the left hoist cylinder 18 of perching knife and the right hoist cylinder 19 of perching knife, any one executive component is worked, open the secondary valve in the load sensing multi-way valve 9 that executive component is corresponding, thereby make corresponding executive component work.In addition, load sensing multi-way valve 9 is crossed shuttle valve 7 by the information exchange of load and is fed back to load-reacting pump 4, thereby realizes feedback and the control of responsive to load variable pump 4.
Claims (7)
1. the hydraulic system of a land leveler operating device, it is characterized in that, comprise fuel tank (25), constant displacement pump (3), pressure-gradient control valve (6), six logical banked direction control valves (8), prefill valve (5), load-reacting pump (4), shuttle valve (7) and load sensing multi-way valve (9);
Described fuel tank (25) is provided with two oil-outs, two oil-outs on fuel tank (25) are connected with the oiler of constant displacement pump (3) and the oiler of load-reacting pump (4) respectively, the oil-out of constant displacement pump (3) is connected with the oiler of pressure-gradient control valve (6), two oil-outs on pressure-gradient control valve (6) turn to the oiler in loop to be connected with oiler and the land leveller of main valve in six logical banked direction control valves (8) respectively, in six logical banked direction control valves (8), the oil-out of main valve is connected with the oiler of fuel tank (25), five secondary valves in six logical banked direction control valves (8) respectively with the rear ridge buster hoist cylinder (10) of land leveller, articulation steering oil cylinder (11), front-wheel dump ram (12), oil cylinder (13) shown by perching knife and front ejector dozer hoist cylinder (14) is connected, the oil-out of load-reacting pump (4) is connected with the oiler of prefill valve (5), two oil-outs on prefill valve (5) are connected with the oiler of main valve in load sensing multi-way valve (9) and the oiler in land leveller service brake loop respectively, in load sensing multi-way valve (9), the oil-out of main valve is connected with the oiler of fuel tank (25), five secondary valves in load sensing multi-way valve (9) respectively with land leveller in perching knife rotary motor (15), shovel angular transformation oil cylinder (16), perching knife is drawn oil cylinder (17), the left hoist cylinder of perching knife (18) and the right hoist cylinder of perching knife (19) are connected,
Two oilers on described shuttle valve (7) are connected with the oil-out that comes bicycle brake loop on load-sensitive mouth and the land leveller of load sensing multi-way valve (9) respectively, and the oil-out of shuttle valve (7) is connected with the control port of load-reacting pump (4).
2. the hydraulic system of land leveler operating device according to claim 1, it is characterized in that, the secondary valve in described six logical banked direction control valves (8) is connected by the first equalizing valve (20) with the rear ridge buster hoist cylinder (10) in land leveller.
3. the hydraulic system of land leveler operating device according to claim 2, it is characterized in that, the secondary valve in described six logical banked direction control valves (8) is connected by the second equalizing valve (21) with the front ejector dozer hoist cylinder (14) in land leveller.
4. the hydraulic system of land leveler operating device according to claim 3, it is characterized in that, the secondary valve in described load sensing multi-way valve (9) is connected by the 3rd equalizing valve (23) with the left hoist cylinder of perching knife (18) in land leveller.
5. the hydraulic system of land leveler operating device according to claim 4, it is characterized in that, the secondary valve in described load sensing multi-way valve (9) is connected by the 4th equalizing valve (24) with the right hoist cylinder of perching knife (19) in land leveller.
6. the hydraulic system of land leveler operating device according to claim 1, it is characterized in that, the secondary valve in described load sensing multi-way valve (9) is connected by overflow valve (22) with the perching knife rotary motor (15) in land leveller.
7. the hydraulic system of land leveler operating device according to claim 1, it is characterized in that, an oil-out on described fuel tank (25) is connected with the oiler of constant displacement pump (3) by the first oil filter (1), and another oil-out on fuel tank (25) is connected with the oiler of load-reacting pump (4) by the second oil filter (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032657.6A CN103774707B (en) | 2014-01-23 | 2014-01-23 | A kind of hydraulic system of land leveler operating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032657.6A CN103774707B (en) | 2014-01-23 | 2014-01-23 | A kind of hydraulic system of land leveler operating device |
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| Publication Number | Publication Date |
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| CN103774707A true CN103774707A (en) | 2014-05-07 |
| CN103774707B CN103774707B (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410032657.6A Expired - Fee Related CN103774707B (en) | 2014-01-23 | 2014-01-23 | A kind of hydraulic system of land leveler operating device |
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| CN (1) | CN103774707B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545844A (en) * | 2016-03-19 | 2016-05-04 | 青岛大学 | Hydraulic control system of energy-saving bulldozer working device |
| CN106836337A (en) * | 2017-03-30 | 2017-06-13 | 徐州徐工筑路机械有限公司 | A kind of land leveller variable delivery hydraulic system |
| CN112012969A (en) * | 2020-08-27 | 2020-12-01 | 广西柳工机械股份有限公司 | Hydraulic system and loader |
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| JP3673118B2 (en) * | 1999-06-22 | 2005-07-20 | 新キャタピラー三菱株式会社 | Control device for fluid pressure actuator |
| CN201739265U (en) * | 2010-05-06 | 2011-02-09 | 沈阳北方交通重工有限公司 | Single triple fixed displacement pump oil supply device for development machine |
| CN102713088A (en) * | 2009-12-17 | 2012-10-03 | 斗山英维高株式会社 | Hydraulic system for construction machinery |
| US20120301325A1 (en) * | 2011-05-24 | 2012-11-29 | Nelson Bryan E | Pump system having open-loop torque control |
| CN203716203U (en) * | 2014-01-23 | 2014-07-16 | 长安大学 | Hydraulic system for working device of land leveler |
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2014
- 2014-01-23 CN CN201410032657.6A patent/CN103774707B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3673118B2 (en) * | 1999-06-22 | 2005-07-20 | 新キャタピラー三菱株式会社 | Control device for fluid pressure actuator |
| CN102713088A (en) * | 2009-12-17 | 2012-10-03 | 斗山英维高株式会社 | Hydraulic system for construction machinery |
| CN201739265U (en) * | 2010-05-06 | 2011-02-09 | 沈阳北方交通重工有限公司 | Single triple fixed displacement pump oil supply device for development machine |
| US20120301325A1 (en) * | 2011-05-24 | 2012-11-29 | Nelson Bryan E | Pump system having open-loop torque control |
| CN203716203U (en) * | 2014-01-23 | 2014-07-16 | 长安大学 | Hydraulic system for working device of land leveler |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545844A (en) * | 2016-03-19 | 2016-05-04 | 青岛大学 | Hydraulic control system of energy-saving bulldozer working device |
| CN105545844B (en) * | 2016-03-19 | 2017-11-10 | 青岛大学 | A kind of energy-saving bulldozer working device hydraulic control system |
| CN106836337A (en) * | 2017-03-30 | 2017-06-13 | 徐州徐工筑路机械有限公司 | A kind of land leveller variable delivery hydraulic system |
| CN112012969A (en) * | 2020-08-27 | 2020-12-01 | 广西柳工机械股份有限公司 | Hydraulic system and loader |
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| CN103774707B (en) | 2016-07-27 |
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