CN212337744U - Excavator hydraulic system capable of reducing cost - Google Patents
Excavator hydraulic system capable of reducing cost Download PDFInfo
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- CN212337744U CN212337744U CN202020764227.4U CN202020764227U CN212337744U CN 212337744 U CN212337744 U CN 212337744U CN 202020764227 U CN202020764227 U CN 202020764227U CN 212337744 U CN212337744 U CN 212337744U
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Abstract
The utility model discloses an excavator hydraulic system capable of reducing cost, which comprises a hydraulic oil tank, a multi-way valve, a steering gear and a hydraulic pilot system, wherein the multi-way valve, the steering gear and the hydraulic pilot system are respectively communicated with the hydraulic oil tank, the excavator hydraulic system also comprises a main oil supply pump and a secondary pressure reducing valve, the oil outlet end of the main oil supply pump is provided with a main oil supply path communicated with the oil inlet end of the multi-way valve, and the oil outlet end of the main oil supply path is provided with an oil supply branch communicated with the oil inlet end of the secondary; the oil outlet end of the two-stage pressure reducing valve is provided with a steering gear oil supply way communicated with the oil inlet end of a steering gear, a pilot control oil supply way communicated with the oil inlet end of a hydraulic pilot system and a main oil drainage way communicated with a hydraulic oil tank. Compared with the prior art, beneficial effect lies in, the utility model discloses a two-stage relief pressure valve replaces two pump bodies at least to realize the fuel feeding, has practiced thrift the cost expense greatly, makes hydraulic system overall structure compact simultaneously, reduces whole weight, saves installation space, makes things convenient for the hydraulic system structure to arrange.
Description
Technical Field
The utility model relates to an excavator hydraulic system field, concretely relates to but reduce cost's excavator hydraulic system.
Background
The hydraulic system of the excavator consists of a plurality of basic loops and auxiliary loops, and has the functions of converting the mechanical energy of an engine into hydraulic energy by using oil as a working medium and transmitting the hydraulic energy by using a hydraulic pump, and then converting the hydraulic energy back into the mechanical energy by using a hydraulic cylinder, a hydraulic motor and the like, so that various actions of the excavator are realized.
As shown in fig. 1, a hydraulic system of a conventional wheel excavator mainly includes a multi-way valve 1 ' for performing main operations, a steering gear 2 ', and a hydraulic pilot system 3 ' for operating the hydraulic system. When the hydraulic steering system works, one or two oil supply pumps are used for supplying working oil pressure to the multi-way valve 1 ', and in addition, one oil supply pump is used for supplying high-pressure steering boosting oil pressure to the steering gear 2 ' and supplying low-pressure pilot oil pressure to the pilot oil pressure system 3 '. However, the oil supply mode at least needs three or four oil supply pumps, the number of the pumps is large, and the engine needs a plurality of force taking points; or the pump body is connected in series behind the pump body, but the pump body occupies more space and has higher cost and higher requirement on the strength of the main shaft of the pump body.
In view of the above, the applicant has made an intensive study to solve the above problems and has made the present invention.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a but reduce cost's excavator hydraulic system can reduce more oil pump quantity, greatly reduced the cost expense.
In order to achieve the above purpose, the solution of the present invention is:
a hydraulic system of an excavator capable of reducing cost comprises a hydraulic oil tank, a multi-way valve, a steering gear and a hydraulic pilot system which are respectively communicated with the hydraulic oil tank, and further comprises a main oil supply pump and a secondary pressure reducing valve, wherein an oil outlet end of the main oil supply pump is provided with a main oil supply way communicated with an oil inlet end of the multi-way valve, and an oil outlet end of the main oil supply way is provided with an oil supply branch communicated with an oil inlet end of the secondary pressure reducing valve; the oil outlet end of the two-stage pressure reducing valve is provided with a steering gear oil supply way communicated with the oil inlet end of a steering gear, a pilot control oil supply way communicated with the oil inlet end of a hydraulic pilot system and a main oil drainage way communicated with a hydraulic oil tank.
Furthermore, the second-level pressure reducing valve comprises a first pressure reducing valve and a second pressure reducing valve, the oil inlet end of the first pressure reducing valve and the oil inlet end of the second pressure reducing valve are communicated with the oil supply branch respectively, the oil outlet end of the first pressure reducing valve is communicated with the oil inlet end of the steering gear, and the oil outlet end of the second pressure reducing valve is communicated with the oil inlet end of the hydraulic pilot system.
Furthermore, the second-stage pressure reducing valve further comprises an overflow valve, and the oil inlet end of the overflow valve is communicated with the oil outlet end of the second pressure reducing valve.
Further, an energy accumulator is arranged between the second pressure reducing valve and the overflow valve.
Further, the first pressure reducing valve is provided with a first oil drainage branch which is communicated with the main oil drainage path; the second pressure reducing valve is provided with a second oil drainage branch communicated with the main oil drainage path.
Furthermore, the main oil supply pump adopts a single plunger pump.
Furthermore, the main oil supply pump adopts a load sensitive pump.
After adopting above-mentioned structure, during operation, main fuel feed pump supplies high-pressure oil to the multiple unit valve through main fuel feed way, and main fuel feed pump divides partial high-pressure oil through the fuel feeding branch road simultaneously and supplies to the second grade relief pressure valve. In the two-stage pressure reducing valve, a part of high-pressure oil flows to the first pressure reducing valve and is appropriately reduced in pressure, and then flows out of a steering gear oil supply circuit to be supplied to the steering gear; and the other part of high-pressure oil flows into the second pressure reducing valve and is reduced to low-pressure oil, and then the low-pressure oil is supplied to the hydraulic pilot system through the pilot operation oil supply path, so that the oil pressure of each part in the hydraulic system can meet the hydraulic requirement of the excavator during working.
Compared with the prior art, beneficial effect lies in, the utility model discloses a work oil content outflow in the second grade relief pressure valve will main fuel feed pump to supply with steering gear and hydraulic pressure guide system respectively after being stepped down by first relief pressure valve and second relief pressure valve, thereby replace adopting the fuel feed pump fuel feeding, reduced two pump bodies at least, practiced thrift the cost expense greatly, make hydraulic system overall structure compact simultaneously, reduce whole weight, save installation space, make things convenient for the hydraulic system structure to arrange. In addition, the oil supply pump can adopt a load sensitive pump, a single pump can integrate a feedback loop, the signal feedback is rapid, the load sensitive pump is more oil-saving, the cost is further reduced, the action is flexible, and the coordination of the composite action is good.
Drawings
Fig. 1 is a simple oil circuit diagram of a hydraulic system of a conventional excavator.
Fig. 2 is an oil circuit diagram of the first embodiment of the present invention.
Fig. 3 is an oil circuit diagram according to a second embodiment of the present invention.
Fig. 4 is a diagram showing an oil passage structure of the two-stage pressure reducing valve.
In the figure:
a hydraulic oil tank-1; a multi-way valve-2; a diverter-3; a hydraulic pilot system-4;
a main oil supply pump-5; a secondary pressure reducing valve-6; a first pressure reducing valve-61; a first drainage leg-611;
a second pressure reducing valve-62; a second oil drainage branch-621; an overflow valve-63; a main oil supply path-71;
an oil supply branch-72; a steering oil supply path-73; pilot operated oil supply-74;
a main oil drainage path-75; an overflow oil path-76; line-77 for the diverter Ls;
a multiplex valve Ls line-78.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
As shown in fig. 2-4, a hydraulic system of an excavator capable of reducing cost comprises a hydraulic oil tank 1, a multi-way valve 2, a steering gear 3 and a hydraulic pilot system 4 which are respectively communicated with the hydraulic oil tank 1, wherein the hydraulic system further comprises a main oil supply pump 5 and a secondary pressure reducing valve 6, an oil outlet end of the main oil supply pump 5 is provided with a main oil supply path 71 communicated with an oil inlet end of the multi-way valve 2, and an oil outlet end of the main oil supply path 71 is provided with an oil supply branch 72 communicated with an oil inlet end of the secondary pressure reducing valve 6; the oil outlet end of the secondary pressure reducing valve 6 has a steering oil supply path 73 communicating with the oil inlet end of the steering gear 3, a pilot operation oil supply path 74 communicating with the oil inlet end of the hydraulic pilot system 4, and a main relief path 75 communicating with the hydraulic oil tank 1.
With the above configuration, the main oil supply pump 5 supplies high-pressure oil to the multi-way valve 2 through the main oil supply path 71, and the main oil supply pump 5 branches off part of the high-pressure oil through the oil supply branch 72 and supplies the branched oil to the secondary pressure reducing valve 6. The secondary pressure reducing valve 6 is further branched and respectively supplied to the steering gear 3 and the hydraulic pilot system 4, so that the hydraulic pressure of each part in the hydraulic system can meet the hydraulic requirement of the excavator during working. Compared with the prior art, the working oil in the main oil supply pump 5 flows out through the secondary pressure reducing valve 6 and is supplied to the steering gear 3 and the hydraulic pilot system 4 respectively after being reduced in pressure, so that oil supply of the oil supply pump is replaced, at least two pump bodies are reduced, cost is greatly saved, the whole structure of the hydraulic system is compact, the whole weight is reduced, the installation space is saved, and the hydraulic system is convenient to structurally arrange.
Preferably, the hydraulic pressure required by the steering gear 3 and the hydraulic pilot system 4 is different in magnitude, so that the two-stage pressure reducing valve 6 can simultaneously supply the steering gear 3 and the hydraulic pilot system 4 with working oil pressures different in pressure. The two-stage pressure reducing valve 6 includes a first pressure reducing valve 61 and a second pressure reducing valve 62, an oil inlet end of the first pressure reducing valve 61 and an oil inlet end of the second pressure reducing valve 62 are respectively communicated with an oil supply branch 72, the first pressure reducing valve 61 is communicated with the steering gear 3 through a steering gear oil supply path 73, and the second pressure reducing valve 62 is communicated with the hydraulic pilot system 4 through a pilot operation oil supply path 74. During operation, part of the high-pressure oil in the oil supply branch 72 flows into the first pressure reducing valve 61, is reduced in pressure by the first pressure reducing valve 61, and is supplied to the steering gear 3 through the steering gear oil supply passage 73. The remaining high-pressure oil in the oil supply branch 72 flows into the second pressure reducing valve 62, is converted into low-pressure oil by the second pressure reducing valve 62, and is supplied to the hydraulic pilot system 4.
Preferably, since the oil pressure in the pilot control oil supply passage 74 is small, the secondary pressure reducing valve 6 further includes a relief valve 63 in order to protect the second pressure reducing valve 62, an oil inlet end of the relief valve 63 is provided with a relief oil passage 76 communicating with the pilot control oil supply passage 74, and an oil outlet end of the relief valve 63 is communicated with the main oil drain passage 75. With the above configuration, as shown in fig. 4, the minimum pressure set by the first pressure reducing valve 61 is P3, the minimum pressure set by the second pressure reducing valve 62 is P1, the pressure set by the relief valve 63 is P2, the first pressure reducing valve 61 supplies the steering gear 3 with high-pressure oil, and the second pressure reducing valve 62 supplies the hydraulic pilot system 4 with low-pressure oil, so that the pressure is set to P1< P2< P3, the relief valve 63 is normally closed during normal operation, and when the oil pressure in the pilot control oil supply passage 74 is too high and is greater than P2, the relief valve 63 is opened to return part of the oil from the main oil drain passage 75 to the hydraulic tank 1, thereby performing overload protection and stabilizing the oil pressure in the hydraulic pilot system 4.
Preferably, an accumulator (not shown) is further provided between the second pressure reducing valve 62 and the relief valve 63, so that the response time of the hydraulic pressure stabilization in the hydraulic pilot system 4 can be effectively increased.
Preferably, the first pressure reducing valve 61 is provided with a first oil drainage branch 611, and the first oil drainage branch 611 is communicated with the main oil drainage path 75; the second pressure reducing valve 62 is provided with a second drain branch 621, and the second drain branch 621 communicates with the main drain path 75. The structure enables the first reducing valve 61 and the second reducing valve 62 to discharge oil more smoothly, ensures that the reducing valves can work normally, reduces oil path distribution and further simplifies a hydraulic system.
Preferably, as the utility model discloses a first kind of embodiment, main fuel feed pump 5 adopts the plunger pump, adopts the plunger pump can effectively improve output flow, has higher rated pressure, further improves hydraulic efficiency.
Preferably, as the utility model discloses a second kind of embodiment, main fuel feed pump 5 adopts the sensitive pump of load, but the integrated feedback return circuit, and signal feedback is rapid, and the sensitive pump of load is more fuel-efficient, further reduce cost to the action is nimble, and compound action harmony is good. In addition, for a load sensitive system, a steering gear 3 with an Ls feedback signal is adopted, and a steering gear Ls pipeline 77 is connected into a multi-way valve Ls pipeline 78 through a one-way valve; the phenomenon that the small displacement of the load sensitive pump in the middle position cannot cause the powerless or no action of the steering action is avoided; meanwhile, the condition that the highest value of the load oil pressure of the multi-way valve 2 is far larger than the working oil pressure of the steering gear 3 is avoided, and the existence of the check valve can also prevent high-pressure oil from damaging the steering gear 3.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.
Claims (7)
1. The excavator hydraulic system capable of reducing cost comprises a hydraulic oil tank, a multi-way valve, a steering gear and a hydraulic pilot system which are respectively communicated with the hydraulic oil tank, and is characterized by further comprising a main oil supply pump and a secondary pressure reducing valve, wherein the oil outlet end of the main oil supply pump is provided with a main oil supply way communicated with the oil inlet end of the multi-way valve, and the oil outlet end of the main oil supply way is provided with an oil supply branch communicated with the oil inlet end of the secondary pressure reducing valve; the oil outlet end of the two-stage pressure reducing valve is provided with a steering gear oil supply way communicated with the oil inlet end of a steering gear, a pilot control oil supply way communicated with the oil inlet end of a hydraulic pilot system and a main oil drainage way communicated with a hydraulic oil tank.
2. The excavator hydraulic system of claim 1, wherein the secondary pressure reducing valve comprises a first pressure reducing valve and a second pressure reducing valve, an oil inlet end of the first pressure reducing valve and an oil inlet end of the second pressure reducing valve are respectively communicated with the oil supply branch, an oil outlet end of the first pressure reducing valve is communicated with an oil inlet end of the steering gear, and an oil outlet end of the second pressure reducing valve is communicated with an oil inlet end of the hydraulic pilot system.
3. The cost effective excavator hydraulic system of claim 2 wherein the secondary pressure reducing valve further comprises an overflow valve, the oil inlet end of the overflow valve being in communication with the oil outlet end of the secondary pressure reducing valve.
4. A cost effective excavator hydraulic system as claimed in claim 3 wherein an accumulator is provided between the second pressure reducing valve and the excess flow valve.
5. The cost-effective excavator hydraulic system of claim 4 wherein the first pressure reducing valve is provided with a first oil drainage branch, the first oil drainage branch being in communication with the main oil drainage path; the second pressure reducing valve is provided with a second oil drainage branch communicated with the main oil drainage path.
6. A cost effective excavator hydraulic system as claimed in any one of claims 1 to 5 wherein the main supply pump is a single ram pump.
7. A cost effective excavator hydraulic system as claimed in any one of claims 1 to 5 wherein the main supply pump is a load sensitive pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020764227.4U CN212337744U (en) | 2020-05-11 | 2020-05-11 | Excavator hydraulic system capable of reducing cost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020764227.4U CN212337744U (en) | 2020-05-11 | 2020-05-11 | Excavator hydraulic system capable of reducing cost |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212337744U true CN212337744U (en) | 2021-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020764227.4U Active CN212337744U (en) | 2020-05-11 | 2020-05-11 | Excavator hydraulic system capable of reducing cost |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212337744U (en) |
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2020
- 2020-05-11 CN CN202020764227.4U patent/CN212337744U/en active Active
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