CN203188272U - Excavator oil return pressure control loop - Google Patents
Excavator oil return pressure control loop Download PDFInfo
- Publication number
- CN203188272U CN203188272U CN 201320163076 CN201320163076U CN203188272U CN 203188272 U CN203188272 U CN 203188272U CN 201320163076 CN201320163076 CN 201320163076 CN 201320163076 U CN201320163076 U CN 201320163076U CN 203188272 U CN203188272 U CN 203188272U
- Authority
- CN
- China
- Prior art keywords
- valve
- control loop
- oil return
- hydraulic
- directional valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The utility model discloses an excavator oil return pressure control loop, and belongs to the technical field of engineering machinery oil return pressure control. The excavator oil return pressure control loop comprises a hydraulic oil tank (5), a radiator (7), a counterbalance valve (8), a rotary motor (9), an electronic control loop and a hydraulic control loop, the electronic loop comprises a pressure switch (1), a controller (2) and a solenoid directional valve (3), the hydraulic control loop comprises a bypass valve (4) and a return oil filter (6), the pressure switch, the controller and the solenoid directional valve are connected in series, the solenoid directional valve and the bypass valve are connected in parallel through a hydraulic pipeline, a parallel-connecting loop formed by the solenoid directional valve and the bypass valve is connected with a system oil return pipeline in parallel, and the parallel-connecting loop is connected to the hydraulic oil tank through the return oil filter. Compared with the prior art, the excavator oil return pressure control loop enables oil return pressure to be controlled within a safe range value, accurately controls a system oil return pressure value, effectively protects the normal working of a hydraulic system, prolongs the service life, enables an excavator to work stably and reliably, and reduces energy consumption.
Description
Technical field
The utility model relates to a kind of excavator return pressure control loop, belongs to engineering machinery return pressure control technology field.
Background technology
Excavator in the course of the work at present, return pressure often exceeds system and allows maximum pressure, causes the reason of this phenomenon to cause mainly due to the counterbalance valve pressure loss, the radiator pressure loss and three kinds of pressure losses stacks of the return filter pressure loss on the oil return line.After return pressure exceeded the maximum pressure value of permission, problem such as can cause the working life of rotary motor and oil return filter core to reduce, radiator performance is impaired, system acting is unusual made that simultaneously the return pressure loss increases, energy consumption increases.At present for reducing the return pressure value, bypass valve in parallel on oil return line, but bypass valve is the proportional-type bypass valve, the little then bypass valve of the oil return flow pressure loss is low, the bypass valve pressure loss height when oil return flow is big, when the oil return flow was big, this bypass valve can't be limited to the return pressure value in certain safe range value.
The utility model content
Problem at above-mentioned prior art existence; the utility model provides a kind of excavator return pressure control loop; make return pressure control within certain safe range value; accurate control system return pressure value; effectively protect the operate as normal of parts such as rotary motor, oil return filter core, radiator; prolong working life, so make the excavator working stability reliable, reduce energy consumption.
To achieve these goals, the utility model comprises hydraulic oil container, radiator, counterbalance valve, rotary motor, electric control circuit and hydraulic control loop, electric control circuit comprises switch, controller and solenoid operated directional valve, the hydraulic control loop comprises bypass valve and return filter, and hydraulic oil container is connected with rotary motor by return filter, radiator, counterbalance valve.
The switch of electric control circuit is pressure switch, this pressure switch is installed in the benefit oil port of rotary motor, pressure switch, controller and solenoid operated directional valve are connected by circuit, bypass valve is in parallel with solenoid operated directional valve by fluid pressure line, the shunt circuit that solenoid operated directional valve and bypass valve constitute is in parallel with radiator and counterbalance valve on the system oil return pipeline, and this solenoid operated directional valve is connected with hydraulic oil container by return filter with the shunt circuit that bypass valve constitutes.
Compared with prior art; this excavator return pressure control loop; detect the oil pressure that rotary motor is mended oil port by pressure switch control; in parallel with radiator and counterbalance valve on the system oil return pipeline through the shunt circuit of solenoid operated directional valve and bypass valve formation again; be connected to hydraulic oil container by return filter at last; make return pressure control within certain safe range value; accurately controlled the system oil return force value; effectively protected rotary motor; the oil return filter core; the operate as normal of parts such as radiator; prolonged working life, and then made the excavator working stability reliable; reduce energy consumption.
Description of drawings
Fig. 1 is control principle figure of the present utility model.
Among the figure: 1, pressure switch, 2, controller, 3, solenoid operated directional valve, 4, bypass valve, 5, hydraulic oil container, 6, return filter, 7, radiator, 8, counterbalance valve, 9, rotary motor.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1, this excavator return pressure control loop comprises hydraulic oil container 5, radiator 7, counterbalance valve 8, rotary motor 9, electric control circuit and hydraulic control loop, electric control circuit comprises switch 1, controller 2 and solenoid operated directional valve 3, the hydraulic control loop comprises bypass valve 4 and return filter 6, and hydraulic oil container 5 is connected with rotary motor 9 by return filter 6, radiator 7, counterbalance valve 8.
The switch 1 of electric control circuit is pressure switch, this pressure switch 1 is installed in the benefit oil port of rotary motor 9, pressure switch 1, controller 2 and solenoid operated directional valve 3 are connected by circuit, bypass valve 4 is in parallel with solenoid operated directional valve 3 by fluid pressure line, the shunt circuit that solenoid operated directional valve 3 and bypass valve 4 constitute is in parallel with radiator 7 and counterbalance valve 8 on the system oil return pipeline, and this solenoid operated directional valve 3 is connected with hydraulic oil container 5 by return filter 6 with the shunt circuit that bypass valve 4 constitutes.
At rotary motor 9 repairing mouth setting pressure switches 1, detect the oil pressure that rotary motor 9 is mended oil port by pressure switch 1 control, because the maximum pressure value that the repairing road of rotary motor 9 allows is 10bar, the application life that can reduce rotary motor 9 greatly when surpassing 10bar is so be set at 10bar with the connection value of pressure switch 1.When return pressure surpasses 10bar, pressure switch 1 is connected, the signal of telecommunication is delivered to controller 2 by circuit, after controller 2 receives the signal of telecommunication of pressure switch 1, to connect towards the circuit of solenoid operated directional valve 3, electromagnet Y1 on the solenoid operated directional valve 3 get electric after, promote the action of solenoid operated directional valve 3 spools by electromagnetic force, oil circuit moment opens fully, after fluid can enter return filter 6 through solenoid operated directional valve 3, enter hydraulic oil container 5 again, avoided hydraulic oil in the return pressure loss that radiator 7 and counterbalance valve 8 cause, return pressure is reduced; When return pressure drop to be lower than pressure switch 1 setting pressure 10bar after, pressure switch 1 outage, the circuit of control solenoid operated directional valve 3 disconnects in the controller 2, after the electromagnet Y1 outage, solenoid operated directional valve 3 relies on spring pressure to make the spool action, return to off-state, the loop of process solenoid operated directional valve 3 is cut off, and oil return is got back to hydraulic oil container 5 through behind return filter 6, radiator 7 and the counterbalance valve 8.
Claims (1)
1. excavator return pressure control loop, comprise hydraulic oil container (5), radiator (7), counterbalance valve (8), rotary motor (9), electric control circuit and hydraulic control loop, electric control circuit comprises switch (1), controller (2) and solenoid operated directional valve (3), the hydraulic control loop comprises bypass valve (4) and return filter (6), and hydraulic oil container (5) is connected with rotary motor (9) by return filter (6), radiator (7), counterbalance valve (8);
It is characterized in that, the switch of described electric control circuit (1) is pressure switch, this pressure switch (1) is installed in the benefit oil port of rotary motor (9), described pressure switch (1), controller (2) and solenoid operated directional valve (3) are connected by circuit, described bypass valve (4) is in parallel with solenoid operated directional valve (3) by fluid pressure line, the shunt circuit that described solenoid operated directional valve (3) and bypass valve (4) constitute is in parallel with radiator (7) and counterbalance valve (8) on the system oil return pipeline, and this solenoid operated directional valve (3) is connected with hydraulic oil container (5) by return filter (6) with the shunt circuit that bypass valve (4) constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320163076 CN203188272U (en) | 2013-04-03 | 2013-04-03 | Excavator oil return pressure control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320163076 CN203188272U (en) | 2013-04-03 | 2013-04-03 | Excavator oil return pressure control loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203188272U true CN203188272U (en) | 2013-09-11 |
Family
ID=49105141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320163076 Withdrawn - After Issue CN203188272U (en) | 2013-04-03 | 2013-04-03 | Excavator oil return pressure control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203188272U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195124A (en) * | 2013-04-03 | 2013-07-10 | 徐州徐工挖掘机械有限公司 | Excavator return oil pressure control loop |
| CN104743461A (en) * | 2013-12-31 | 2015-07-01 | 天津建筑机械厂 | Hydraulic winch device of bulldozer 160 series |
| CN107217700A (en) * | 2017-07-27 | 2017-09-29 | 苏州蓝王机床工具科技有限公司 | A kind of excavator return oil pressure control loop |
-
2013
- 2013-04-03 CN CN 201320163076 patent/CN203188272U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195124A (en) * | 2013-04-03 | 2013-07-10 | 徐州徐工挖掘机械有限公司 | Excavator return oil pressure control loop |
| CN104743461A (en) * | 2013-12-31 | 2015-07-01 | 天津建筑机械厂 | Hydraulic winch device of bulldozer 160 series |
| CN107217700A (en) * | 2017-07-27 | 2017-09-29 | 苏州蓝王机床工具科技有限公司 | A kind of excavator return oil pressure control loop |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130911 Effective date of abandoning: 20150923 |
|
| RGAV | Abandon patent right to avoid regrant |