CN204125997U - The motor flow hydraulic control circuit of excavator minus flow system - Google Patents
The motor flow hydraulic control circuit of excavator minus flow system Download PDFInfo
- Publication number
- CN204125997U CN204125997U CN201420566273.8U CN201420566273U CN204125997U CN 204125997 U CN204125997 U CN 204125997U CN 201420566273 U CN201420566273 U CN 201420566273U CN 204125997 U CN204125997 U CN 204125997U
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- valve
- minus flow
- bit
- pressure sensor
- minus
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Abstract
The utility model discloses a kind of motor flow hydraulic control circuit of excavator minus flow system, comprise two minus flow pumps, revolution pilot handle, two minus flow pump pressure sensors, pioneer pump, precursor overflow valve, three bi-bit bi-pass reversal valves, three shuttle valves, three position four-way directional control valve, revolution one action pressure sensor and solenoid-operated proportional reducing valve, three position four-way directional control valve output is connected with the second shuttle valve by solenoid-operated proportional reducing valve, first shuttle valve is connected with the first minus flow valve input in main valve, revolution pilot handle is connected with the 3rd shuttle valve and joins, 3rd shuttle valve is also connected with three position four-way directional control valve first end by bi-bit bi-pass reversal valve II, 3rd shuttle valve is also connected with revolution one action pressure sensor.The utility model, when excavator carries out revolution one action or both sides walking action simultaneously, can reduce minus flow pump delivery, thus reduce the flow flowing through motor, avoid the load of the excessive increase motor of flow, extend the application life of motor.
Description
Technical field
The utility model relates to a kind of hydraulic system of excavator, and especially a kind of hydraulic control circuit of excavator minus flow system, belongs to engineering machinery hydraulic drive technology field.
Background technology
Excavator is the complicated engineering machinery higher to composite move requirement of a kind of operating mode, and when excavator carries out composite move, hydraulic pump need provide enough flows to come each oil cylinder, motor fuel feeding.Therefore, the excavator pump delivery selected need could meet various composite move needs enough greatly.But, due to the restriction in hydraulic part type selecting and whole machine installation space, the corresponding motor compared with huge discharge often can not be selected.When will cause motor single movement like this, the flow through motor is excessive, if do not carry out flow-control to motor, will shorten the application life of motor.
Utility model content
The purpose of this utility model is to provide a kind of motor flow hydraulic control circuit of excavator minus flow system, realize reducing flow to hydraulic pump when excavator rotary motor and running motor one action, and when excavator carries out single job action or multiple working action, the original huge discharge of minus flow pump can be kept, meet job requirements.
The utility model is achieved by the following technical programs:
A motor flow hydraulic control circuit for excavator minus flow system, comprises controller, first minus flow pump, second minus flow pump, first minus flow valve in main valve, second minus flow valve in main valve, revolution pilot handle, to get off auto idle speed pressure switch, to get on the bus auto idle speed pressure switch, first minus flow pump pressure sensor, second minus flow pump pressure sensor, pioneer pump, precursor overflow valve, bi-bit bi-pass reversal valve I, bi-bit bi-pass reversal valve II, bi-bit bi-pass reversal valve III, first shuttle valve, second shuttle valve, 3rd shuttle valve, three position four-way directional control valve, revolution one action pressure sensor and solenoid-operated proportional reducing valve, controller by holding wire respectively with revolution one action pressure sensor, to get off auto idle speed pressure switch, to get on the bus auto idle speed pressure switch, bi-bit bi-pass reversal valve I, bi-bit bi-pass reversal valve II, bi-bit bi-pass reversal valve III is connected with solenoid-operated proportional reducing valve control end separately, pioneer pump is connected with precursor overflow valve and three position four-way directional control valve input respectively, three position four-way directional control valve output is held with the P1 of the second shuttle valve by solenoid-operated proportional reducing valve and is connected, the P2 end of the second shuttle valve is connected with the second minus flow valve input in main valve, the A end of the second shuttle valve is connected with the first minus flow pump pressure sensor control end, respectively also by bi-bit bi-pass reversal valve I, first shuttle valve is connected with the first minus flow valve input in main valve, and the A end of the first shuttle valve is connected with the second minus flow pump pressure sensor control end, revolution pilot handle is held with the P1 of the 3rd shuttle valve, P2 holds in parallel, and the A end of the 3rd shuttle valve is connected with three position four-way directional control valve first end by bi-bit bi-pass reversal valve II, and the A end of the 3rd shuttle valve is also connected with revolution one action pressure sensor, three position four-way directional control valve second end is connected by get off with main valve respectively auto idle speed pressure port, auto idle speed pressure switch of getting off of bi-bit bi-pass reversal valve III, and auto idle speed pressure switch of getting on the bus and main valve auto idle speed pressure port of getting on the bus is connected.
The purpose of this utility model can also be realized further by following technical measures.
The motor flow hydraulic control circuit of aforesaid excavator minus flow system, the pressure measurement scope of wherein said revolution one action pressure sensor is 0 ~ 6MPa, the pressure regulation spectrum of described solenoid-operated proportional reducing valve is 1 ~ 3MPa, described pressure regulation spectrum of getting off auto idle speed pressure switch and auto idle speed pressure switch of getting on the bus is 1 ~ 2MPa, precursor overflow valve pressure regulation spectrum is 3.5 ~ 4MPa, and the pressure regulation spectrum of the first minus flow pump pressure sensor and the second minus flow pump pressure sensor is 0 ~ 40MPa.
The utility model has set up three bi-bit bi-pass reversal valves and three shuttle valves in existing excavator minus flow hydraulic control system, and three position four-way directional control valve, revolution one action pressure sensor and solenoid-operated proportional reducing valve, when excavator carries out revolution one action or both sides walking action simultaneously, minus flow pump delivery can be reduced, thus reduce the flow flowing through motor, avoid the load of the excessive increase motor of flow, extend the application life of motor, reduce the use cost of motor.When carrying out the single job actions such as such as swing arm lifting, the outer pendulum of dipper withdrawal, the outer pendulum of scraper bowl withdrawal or multiple working action at excavator, the original huge discharge of minus flow pump can be kept, meet job requirements, increase work efficiency.
Advantage and disadvantage of the present utility model, by for illustration and explanation for the non-limitative illustration passing through preferred embodiment below, these embodiments, only provide as an example with reference to accompanying drawing.
Accompanying drawing explanation
Fig. 1 is hydraulic schematic diagram of the present utility model.
In figure, controller 1, first minus flow pump 2, second minus flow pump 3, two-position two-way solenoid valve I 4, first shuttle valve 5, second shuttle valve 6, first minus flow valve 7 in main valve, second minus flow valve 8 in main valve, solenoid-operated proportional reducing valve 9, three position four-way directional control valve 10, 3rd shuttle valve 11, revolution pilot handle 12, to get off auto idle speed pressure switch 13, to get on the bus auto idle speed pressure switch 14, main valve is got off auto idle speed pressure port 15, main valve is got on the bus auto idle speed pressure port 16, pioneer pump 17, precursor overflow valve 18, bi-bit bi-pass reversal valve II 19, revolution one action pressure sensor 20, first minus flow pump pressure sensor 21, second minus flow pump pressure sensor 22, bi-bit bi-pass reversal valve III 23, auto idle speed control port 24 in main valve.
Wherein, auto idle speed pressure switch 14 of getting on the bus, main valve " getting on the bus " of getting off in auto idle speed pressure port 15 refers to the swing arm lifting of excavator, dipper regains outer pendulum, the actions such as outer pendulum regained by scraper bowl, and " getting off " refers to the actions such as revolution, walking.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the utility model comprises controller 1, first minus flow pump 2, second minus flow 3 pump, first minus flow valve 7 in main valve, second minus flow valve 8 in main valve, revolution pilot handle 12, to get off auto idle speed pressure switch 13, to get on the bus auto idle speed pressure switch 14, first minus flow pump pressure sensor 21, second minus flow pump pressure sensor 22, pioneer pump 17, precursor overflow valve 18, bi-bit bi-pass reversal valve I 4, bi-bit bi-pass reversal valve II 19, bi-bit bi-pass reversal valve III 23, first shuttle valve 5, second shuttle valve 6, 3rd shuttle valve 11, three position four-way directional control valve 10, revolution one action pressure sensor 20 and solenoid-operated proportional reducing valve 9, controller by holding wire respectively with revolution one action pressure sensor 20, to get off auto idle speed pressure switch 13, to get on the bus auto idle speed pressure switch 14, bi-bit bi-pass reversal valve I 4, bi-bit bi-pass reversal valve II 19, bi-bit bi-pass reversal valve III 23 control end respective with solenoid-operated proportional reducing valve 9 is connected, pioneer pump 17 is connected with precursor overflow valve 18 and three position four-way directional control valve 10 input respectively, three position four-way directional control valve 10 output is held with the P1 of the second shuttle valve 6 by solenoid-operated proportional reducing valve 9 and is connected, the P2 end of the second shuttle valve 6 is connected with the second minus flow valve 8 input in main valve, the A end of the second shuttle valve 6 is connected with the first minus flow pump pressure sensor 21 control end, respectively also by bi-bit bi-pass reversal valve I 4, first shuttle valve 5 is connected with the first minus flow valve 7 input in main valve, and the A end of the first shuttle valve 5 is connected with the second minus flow pump pressure sensor 22 control end, revolution pilot handle 12 is held with the P1 of the 3rd shuttle valve 11, P2 holds in parallel, and the A end of the 3rd shuttle valve 11 is connected with three position four-way directional control valve 10 first end by bi-bit bi-pass reversal valve II 19, and the A end of the 3rd shuttle valve 11 is also connected with revolution one action pressure sensor 20, three position four-way directional control valve 10 second end is connected by get off with the main valve of auto idle speed control port 24 in main valve respectively auto idle speed pressure port 15, auto idle speed pressure switch 13 of getting off of bi-bit bi-pass reversal valve III 23, and auto idle speed pressure switch 14 of getting on the bus and main valve auto idle speed pressure port 16 of getting on the bus is connected.
The pressure measurement scope of revolution one action pressure sensor is 0 ~ 6MPa, the pressure regulation spectrum of described solenoid-operated proportional reducing valve is 1 ~ 3MPa, described pressure regulation spectrum of getting off auto idle speed pressure switch and auto idle speed pressure switch of getting on the bus is 1 ~ 2MPa, and the present embodiment is 1.9MPa; Precursor overflow valve pressure regulation spectrum is 3.5 ~ 4MPa, and the present embodiment is 3.8MPa, and the pressure regulation spectrum of the first minus flow pump pressure sensor and the second minus flow pump pressure sensor is 0 ~ 40MPa.
The utility model can reduce the flow flowing through motor in following two kinds of actions:
1) one action is turned round
Handle revolution pilot handle 12, pressure oil arrives two-position two-way solenoid valve II 19 and revolution one action pressure sensor 20 through the 3rd shuttle valve 11; When controller detects that revolution one action pressure sensor 20 has pressure signal, get off auto idle speed pressure switch 13 without pressure signal, and the first minus flow pump pressure sensor 21 has high-pressure signal, and the second minus flow pump pressure sensor 22 pressure is only about 3MPa pressure when the second minus flow pump sky flows, then controller 1 sender is to bi-bit bi-pass reversal valve II 19, makes its conducting.Pressure oil makes three position four-way directional control valve commutate to left position by three position four-way directional control valve first end, the pressure oil that pioneer pump exports reduces pressure through three position four-way directional control valve 10 and solenoid-operated proportional reducing valve 9 successively, post-decompression pressure oil compares through the second shuttle valve 6 and the pressure of the second minus flow valve 8 in main valve, because the rotary valve key of at this moment main valve is at working position, the flow of main valve meta is cut off, so at this moment in main valve the pressure of the second minus flow valve 8 close to 0, at this moment bi-bit bi-pass reversal valve I 4 is in closure state, then the post-decompression pressure oil of solenoid-operated proportional reducing valve 9 is through the direct inverted flux control mouth to the first minus flow pump 2 of the second shuttle valve 6, regulate the variable swash plate pivot angle of the first minus flow pump 2, the pressure that solenoid-operated proportional reducing valve 9 exports is higher, then the discharge capacity of the first minus flow pump 2 is less, thus the flow reduced through rotary motor.
2) both sides walking action simultaneously
Main valve auto idle speed pressure port 15 of getting off establishes pressure signal, when controller 1 detects that auto idle speed pressure switch 13 of getting off has pressure signal and auto idle speed pressure switch 14 of getting on the bus has a high-voltage signal without pressure signal and the first minus flow pump pressure sensor 21 and the second minus flow pump pressure sensor 22 simultaneously, then controller 1 gives bi-bit bi-pass reversal valve III 23 and bi-bit bi-pass reversal valve I 4 signal, makes bi-bit bi-pass reversal valve III 23 and bi-bit bi-pass reversal valve I 4 commutation conducting, after bi-bit bi-pass reversal valve III 23 conducting, pressure oil promotes three position four-way directional control valve 10 by three position four-way directional control valve 10 second end and changes to right position, the pressure oil exported from pioneer pump 17 reduces pressure through solenoid-operated proportional reducing valve 9 through three position four-way directional control valve 10 right conductings again, post-decompression pressure oil compares through the second shuttle valve 6 and the pressure of the second minus flow valve 8 in main valve, because the walking spool of at this moment main valve is at working position, the flow of main valve meta is cut off, at this moment in main valve, in the first minus flow valve 7 and main valve, the pressure of the second minus flow valve 8 is all close to 0, and bi-bit bi-pass reversal valve I 4 is in commutation conducting state, then the post-decompression pressure oil of solenoid-operated proportional reducing valve 9 through the second shuttle valve 6 and the first shuttle valve 5 simultaneously to the first minus flow pump 2 inverted flux control port and the second minus flow pump inverted flux control port, achieve the pressure oil adjustment simultaneously first minus flow pump of solenoid-operated proportional reducing valve output and the variable swash plate pivot angle of the second minus flow pump 3, the pressure that solenoid-operated proportional reducing valve 9 exports is higher, then the discharge capacity of the first minus flow pump 2 is less, thus the flow reduced through running motor, meet the traffic demand of running motor.
3) other actions:
Signal as revolution one action pressure sensor 20, first minus flow pump pressure sensor 21, the second minus flow pump pressure sensor 22 of controller 1 collection, auto idle speed pressure switch 14 of getting on the bus, auto idle speed pressure switch 15 of getting off does not meet 1) revolution one action or 2) both sides walking action request simultaneously, then bi-bit bi-pass reversal valve I 4, bi-bit bi-pass reversal valve II 19 and bi-bit bi-pass reversal valve III 23 all must not be electric, at this moment three position four-way directional control valve 10 also must not be in electricity meta, the discharge capacity of the first minus flow pump 2 and the second minus flow pump 3 is constant.
In addition to the implementation, the utility model can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of the utility model requirement.
Claims (6)
1. a motor flow hydraulic control circuit for excavator minus flow system, comprises controller, first minus flow pump, second minus flow pump, first minus flow valve in main valve, second minus flow valve in main valve, revolution pilot handle, to get off auto idle speed pressure switch, to get on the bus auto idle speed pressure switch, first minus flow pump pressure sensor, second minus flow pump pressure sensor, pioneer pump and precursor overflow valve, is characterized in that, also comprises bi-bit bi-pass reversal valve I, bi-bit bi-pass reversal valve II, bi-bit bi-pass reversal valve III, first shuttle valve, second shuttle valve, 3rd shuttle valve, three position four-way directional control valve, revolution one action pressure sensor and solenoid-operated proportional reducing valve, controller by holding wire respectively with revolution one action pressure sensor, to get off auto idle speed pressure switch, to get on the bus auto idle speed pressure switch, bi-bit bi-pass reversal valve I, bi-bit bi-pass reversal valve II, bi-bit bi-pass reversal valve III is connected with solenoid-operated proportional reducing valve control end separately, pioneer pump is connected with precursor overflow valve and three position four-way directional control valve input respectively, three position four-way directional control valve output is held with the P1 of the second shuttle valve by solenoid-operated proportional reducing valve and is connected, the P2 end of the second shuttle valve is connected with the second minus flow valve input in main valve, the A end of the second shuttle valve is connected with the first minus flow pump pressure sensor control end, respectively also by bi-bit bi-pass reversal valve I, first shuttle valve is connected with the first minus flow valve input in main valve, and the A end of the first shuttle valve is connected with the second minus flow pump pressure sensor control end, revolution pilot handle is held with the P1 of the 3rd shuttle valve, P2 holds in parallel, and the A end of the 3rd shuttle valve is connected with three position four-way directional control valve first end by bi-bit bi-pass reversal valve II, and the A end of the 3rd shuttle valve is also connected with revolution one action pressure sensor, three position four-way directional control valve second end is connected by get off with main valve respectively auto idle speed pressure port, auto idle speed pressure switch of getting off of bi-bit bi-pass reversal valve III, and auto idle speed pressure switch of getting on the bus and main valve auto idle speed pressure port of getting on the bus is connected.
2. the motor flow hydraulic control circuit of excavator minus flow system as claimed in claim 1, it is characterized in that, the pressure measurement scope of described revolution one action pressure sensor is 0 ~ 6MPa.
3. the motor flow hydraulic control circuit of excavator minus flow system as claimed in claim 1, it is characterized in that, the pressure regulation spectrum of described solenoid-operated proportional reducing valve is 1 ~ 3MPa.
4. the motor flow hydraulic control circuit of excavator minus flow system as claimed in claim 1, is characterized in that, described in the get off pressure regulation spectrum of auto idle speed pressure switch and auto idle speed pressure switch of getting on the bus be 1 ~ 2MPa.
5. the motor flow hydraulic control circuit of excavator minus flow system as claimed in claim 1, it is characterized in that, described precursor overflow valve pressure regulation spectrum is 3.5 ~ 4MPa.
6. the motor flow hydraulic control circuit of excavator minus flow system as claimed in claim 1, it is characterized in that, the pressure regulation spectrum of described first minus flow pump pressure sensor and the second minus flow pump pressure sensor is 0 ~ 40MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420566273.8U CN204125997U (en) | 2014-09-29 | 2014-09-29 | The motor flow hydraulic control circuit of excavator minus flow system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420566273.8U CN204125997U (en) | 2014-09-29 | 2014-09-29 | The motor flow hydraulic control circuit of excavator minus flow system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204125997U true CN204125997U (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420566273.8U Withdrawn - After Issue CN204125997U (en) | 2014-09-29 | 2014-09-29 | The motor flow hydraulic control circuit of excavator minus flow system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204125997U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104314132A (en) * | 2014-09-29 | 2015-01-28 | 中外合资沃得重工（中国）有限公司 | Motor flow hydraulic control circuit and control method for negative flow system of excavator |
| CN113529844A (en) * | 2021-07-08 | 2021-10-22 | 柳州柳工挖掘机有限公司 | Straight-moving control system and method for negative-flow excavator |
-
2014
- 2014-09-29 CN CN201420566273.8U patent/CN204125997U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104314132A (en) * | 2014-09-29 | 2015-01-28 | 中外合资沃得重工（中国）有限公司 | Motor flow hydraulic control circuit and control method for negative flow system of excavator |
| CN104314132B (en) * | 2014-09-29 | 2016-08-24 | 中外合资沃得重工（中国）有限公司 | The motor flow hydraulic control circuit of excavator minus flow system and control method |
| CN113529844A (en) * | 2021-07-08 | 2021-10-22 | 柳州柳工挖掘机有限公司 | Straight-moving control system and method for negative-flow excavator |
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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: 20150128 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |