CN103953090A - Grafting load sensing energy-saving hydraulic system of loader - Google Patents
Grafting load sensing energy-saving hydraulic system of loader Download PDFInfo
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- CN103953090A CN103953090A CN201410197422.2A CN201410197422A CN103953090A CN 103953090 A CN103953090 A CN 103953090A CN 201410197422 A CN201410197422 A CN 201410197422A CN 103953090 A CN103953090 A CN 103953090A
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- control valve
- oil pipe
- load
- load sensing
- plunger pump
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Abstract
The invention provides a grafting load sensing energy-saving hydraulic system of a loader, which mainly comprises a load sensing control valve block, wherein a pressure switch valve and a confluence valve block are sequentially fixed at an oil outlet of a variable plunger pump via bolts; the confluence valve block is connected with the load sensing control valve block via a confluence oil way feedback oil pipe; the pressure switch valve is connected with an LS (load sensing) port of the variable plunger pump via a pressure switch valve feedback oil pipe; and an LS port of the load sensing control valve block is connected with the LS port of the variable plunger pump via a load sensing control valve feedback oil pipe.According to the system, the load sensing control valve block is additionally arranged to allow the variable plunger pump to automatically adjust displacement to achieve supply as required, an output flow of a working pump is best matched with a flow required by the system, no spill losses are caused, and the system is high in efficiency.According to the system, the machining precision and machining cost are reduced by adjusting and optimizing an oil way and arranging the load sensing control valve block outside a multiway valve, and the load sensing control valve block is arranged in the multiway valve originally.
Description
Technical field
The invention belongs to technical field of engineering machinery, be specifically related to a kind of loader grafting formula load-sensitive energy-saving hydraulic system.
Background technology
Wheel loader is a kind ofly to take handling bulk material and be main earth moving machinery, can be widely used in the places such as the engineerings such as highway, railway, harbour, harbour, colliery, mine, goods yard, water conservancy, national defence and urban construction, configure multiple equipment and can realize the functions such as handling, excavation, fragmentation, of many uses.At present, the loader of domestic production, the working barrel of hydraulic system generally adopts the hydraulic system at quantitative single pump list confession or steering pump and working barrel interflow, and there is following shortcoming in this hydraulic system of working: the volumetric efficiency of (1) gear pump is low, internal leakage is large, and energy loss is large.(2) when loader is in driving travel position, control crank is when meta, and working barrel is delivery operating on low voltage still, consumed energy.(3) hydraulic system of working is provided with high-pressure overflow valve, when extreme position is arrived in work, system pressure reaches setting value, and hydraulic pump is close to whole flows will be by overflow valve oil sump tank, cause high power loss, and in system, produce a large amount of thermal losses and cause system effectiveness to reduce.
Summary of the invention
The object of this invention is to provide a kind of loader grafting formula load-sensitive energy-saving hydraulic system, for solving the problems of the technologies described above.
The present invention is mainly comprised of load-sensitive control valve piece, banked direction control valves, oil pipe, Variable plunger pump, pressure opening and closing valve, passes through bolt fixation pressure switch valve and converging valve piece successively at Variable plunger pump oil-out place; Converging valve piece is connected with load-sensitive control valve piece by interflow oil circuit feedback oil pipe, pressure opening and closing valve feeds back oil pipe by pressure opening and closing valve and is connected with the LS mouth of Variable plunger pump, and the LS mouth of load-sensitive control valve piece is connected with the LS mouth of Variable plunger pump by load-sensitive control valve feedback oil pipe; Load-sensitive control valve piece is connected with elevating ram loculus by elevating ram loculus feedback oil pipe, by the large chamber of elevating ram feedback oil pipe, is connected with the large chamber of elevating ram; Load-sensitive control valve piece is connected with rotary ink tank loculus by rotary ink tank loculus feedback oil pipe, by the large chamber of rotary ink tank feedback oil pipe, is connected with the large chamber of rotary ink tank; The leakage hydraulic fluid port of load-sensitive control valve piece is connected with fuel tank by oil pipe.
The present invention by set up load-sensitive control valve piece make the automatic Displacement Regulation of Variable plunger pump realize as required confession, make working barrel output flow all the time with the required flow of system in optimum Match, without spill losses, system effectiveness is high.The present invention, by adjusting, optimize oil circuit, has been arranged on the load-sensitive control valve piece that originally need to be arranged in banked direction control valves outside banked direction control valves, has reduced machining accuracy and processing cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is structural representation of the present invention;
Fig. 2 is hydraulic schematic diagram of the present invention;
1 converging valve piece in figure, 2 pressure opening and closing valves, 3 Variable plunger pumps, 4 pressure opening and closing valve feedback oil pipes, 5 load-sensitive control valve feedback oil pipes, 6 load-sensitive control valve pieces, 7 elevating ram loculus feedback oil pipes, 8 rotary ink tank loculus feedback oil pipes, 9 interflow oil circuit feedback oil pipes, the 10 large chamber of elevating ram feedback oil pipes, the 11 large chamber of rotary ink tank feedback oil pipes, 12 banked direction control valves, the 13 large chambeies of elevating ram, 14 elevating ram loculuses, the 15 large chambeies of rotary ink tank, 16 rotary ink tank loculuses, 17 leak hydraulic fluid port.
The specific embodiment
As shown in the figure: at Variable plunger pump 3 oil-out places, pass through bolt fixation pressure switch valve 2 and converging valve piece 1 successively; Converging valve piece 1 is connected with load-sensitive control valve piece 6 by interflow oil circuit feedback oil pipe 9, is used for the break-make of control load sensitivity control valve piece 6; Pressure opening and closing valve 2 feeds back oil pipe 4 by pressure opening and closing valve and is connected with the LS mouth of Variable plunger pump 3, the LS mouth of load-sensitive control valve piece 6 is connected with the LS mouth of Variable plunger pump 3 by load-sensitive control valve feedback oil pipe 5, is used for transmitting the pressure signal of LS mouth; Load-sensitive control valve piece 6 is connected with elevating ram loculus 14 by elevating ram loculus feedback oil pipe 7, feeds back oil pipe 10 be connected with the large chamber 13 of elevating ram by the large chamber of elevating ram, is used for transmission of pressure signal; Load-sensitive control valve piece 6 is connected with rotary ink tank loculus 16 by rotary ink tank loculus feedback oil pipe 8, feeds back oil pipe 11 be connected with the large chamber 15 of rotary ink tank by the large chamber of rotary ink tank, is used for transmission of pressure signal; The leakage hydraulic fluid port 17 of load-sensitive control valve piece 6 is connected with fuel tank by oil pipe.
When work control handle is during at meta (while driving a vehicle travel position), Variable plunger pump LS mouth pressure signal is zero, the pressure differential of variable piston pump discharge and banked direction control valves import is under pressure switch valve action, and Variable plunger pump is all in small displacement (about delivery 0.1 times) state; When work operative handle moves, pressure in converging valve piece increases, thereby the spool in load-sensitive control valve piece is opened, the LS mouth of load-sensitive control valve piece produces pressure signal, feedback by LS mouth pressure signal supplies the automatic Displacement Regulation realization of Variable plunger pump as required, make working barrel output flow all the time with the required flow of system in optimum Match, without spill losses, system effectiveness is high.
Claims (1)
1. a loader grafting formula load-sensitive energy-saving hydraulic system, it is characterized in that, mainly by load-sensitive control valve piece, banked direction control valves, oil pipe, Variable plunger pump, pressure opening and closing valve, formed, at Variable plunger pump oil-out place, pass through bolt fixation pressure switch valve and converging valve piece successively; Converging valve piece is connected with load-sensitive control valve piece by interflow oil circuit feedback oil pipe, pressure opening and closing valve feeds back oil pipe by pressure opening and closing valve and is connected with the LS mouth of Variable plunger pump, and the LS mouth of load-sensitive control valve piece is connected with the LS mouth of Variable plunger pump by load-sensitive control valve feedback oil pipe; Load-sensitive control valve piece is connected with elevating ram loculus by elevating ram loculus feedback oil pipe, by the large chamber of elevating ram feedback oil pipe, is connected with the large chamber of elevating ram; Load-sensitive control valve piece is connected with rotary ink tank loculus by rotary ink tank loculus feedback oil pipe, by the large chamber of rotary ink tank feedback oil pipe, is connected with the large chamber of rotary ink tank; The leakage hydraulic fluid port of load-sensitive control valve piece is connected with fuel tank by oil pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197422.2A CN103953090A (en) | 2014-05-12 | 2014-05-12 | Grafting load sensing energy-saving hydraulic system of loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197422.2A CN103953090A (en) | 2014-05-12 | 2014-05-12 | Grafting load sensing energy-saving hydraulic system of loader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103953090A true CN103953090A (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410197422.2A Pending CN103953090A (en) | 2014-05-12 | 2014-05-12 | Grafting load sensing energy-saving hydraulic system of loader |
Country Status (1)
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| CN (1) | CN103953090A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09302729A (en) * | 1996-05-17 | 1997-11-25 | Sumitomo Constr Mach Co Ltd | Brake circuit for swing motor of construction machine |
| US20120301325A1 (en) * | 2011-05-24 | 2012-11-29 | Nelson Bryan E | Pump system having open-loop torque control |
| CN103114624A (en) * | 2013-02-25 | 2013-05-22 | 无锡开普机械有限公司 | Load-sensitive operation system of loading machine |
| CN202971075U (en) * | 2012-12-03 | 2013-06-05 | 中联重科股份有限公司 | Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment |
| CN203846554U (en) * | 2014-05-12 | 2014-09-24 | 德州德工机械有限公司 | Grafted load-sensitive energy-saving hydraulic system of loader |
-
2014
- 2014-05-12 CN CN201410197422.2A patent/CN103953090A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09302729A (en) * | 1996-05-17 | 1997-11-25 | Sumitomo Constr Mach Co Ltd | Brake circuit for swing motor of construction machine |
| US20120301325A1 (en) * | 2011-05-24 | 2012-11-29 | Nelson Bryan E | Pump system having open-loop torque control |
| CN202971075U (en) * | 2012-12-03 | 2013-06-05 | 中联重科股份有限公司 | Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment |
| CN103114624A (en) * | 2013-02-25 | 2013-05-22 | 无锡开普机械有限公司 | Load-sensitive operation system of loading machine |
| CN203846554U (en) * | 2014-05-12 | 2014-09-24 | 德州德工机械有限公司 | Grafted load-sensitive energy-saving hydraulic system of loader |
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Application publication date: 20140730 |