CN211421227U - Movable arm hydraulic system - Google Patents

Movable arm hydraulic system Download PDF

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Publication number
CN211421227U
CN211421227U CN201922243837.XU CN201922243837U CN211421227U CN 211421227 U CN211421227 U CN 211421227U CN 201922243837 U CN201922243837 U CN 201922243837U CN 211421227 U CN211421227 U CN 211421227U
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China
Prior art keywords
oil
movable arm
valve
communicated
boom
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CN201922243837.XU
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Chinese (zh)
Inventor
何清华
方庆琯
刘昌盛
吴民旺
李赛白
戴鹏
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Sunward Intelligent Equipment Co Ltd
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Sunward Intelligent Equipment Co Ltd
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Abstract

The utility model discloses a movable arm hydraulic system, including oil tank, hydraulic pump, movable arm hydro-cylinder, multiple unit valve, first switching-over valve and second switching-over valve, the oil-out of hydraulic pump communicates with the oil feed chamber of multiple unit valve, be equipped with first movable arm antithetical couplet and second movable arm antithetical couplet in the multiple unit valve, the working fluid port of first movable arm antithetical couplet communicates with an oil circuit of first switching-over valve, the working fluid port of second movable arm antithetical couplet communicates with the pole chamber of movable arm hydro-cylinder, the rodless chamber of movable arm hydro-cylinder communicates with first switching-over valve; the oil suction port of the hydraulic pump is communicated with the second reversing valve, the oil tank is communicated with one oil way of the second reversing valve, and the other oil way of the second reversing valve is communicated with one oil way of the first reversing valve. The medium-pressure return oil in the lower cavity of the movable arm cylinder can be directly recycled by the hydraulic pump, so that the recycling efficiency is high; and the original hydraulic system can be hardly changed, the cost is low, and the superiority is obvious.

Description

Movable arm hydraulic system
Technical Field
The utility model relates to an engineering machine tool technical field especially relates to a movable arm hydraulic system.
Background
The open hydraulic pump is applied to an open hydraulic system with a plurality of hydraulic actuators. In the multiple hydraulic execution elements, the hydraulic oil return pressure of the oil return cavity of most execution elements is less than 1Mpa, and the hydraulic oil return pressure belongs to zero pressure oil return; however, the oil return cavity of at least one actuating element can generate hydraulic oil return pressure of about 10Mpa, and the hydraulic oil return pressure belongs to medium-pressure oil return. In a typical open hydraulic system, this portion of the return medium pressure oil, as well as the other return zero pressure oil, is released back into the tank. The hydraulic energy of the medium-pressure return oil is changed into heat energy which is consumed when the oil temperature rises, and hydraulic energy loss is caused.
As shown in fig. 1, is a conventional excavator boom principle. The boom cylinder 40 of the hydraulic excavator provides the main power for the lifting and dropping of the excavator boom. The pressure oil output by the first and second hydraulic main pumps 11 and 12 is controlled by the first and second boom linkages 91 and 92 of the multi-way valve 9 to drive the extension and retraction of the piston rod of the boom cylinder 40, and when the piston rod extends, the boom raising load is lifted; when the piston rod is retracted, the boom drop load is lowered. When the load is lifted, hydraulic pressure works on the load, so that the potential energy of the load is increased; when the load of the movable arm falls down, the increased potential energy can be changed into the pressure energy of hydraulic oil in an oil return cavity (large cavity) of the movable arm hydraulic cylinder, so that the oil return pressure of the large cavity is increased to about 10 Mpa. The large-cavity return oil is released to an oil return tank through a movable arm joint throttling port of the multi-way valve 9, and the pressure energy is changed into heat energy and is wasted.
In order to utilize the hydraulic energy returned from the medium pressure (about 10 Mpa), the following methods are currently used for recycling. One is to pass the return oil flow of the higher pressure through the hydraulic transformer and then charge the return oil flow into an accumulator for storage, and the return oil flow can be released for use when needed. And secondly, the oil return flow with higher pressure is used for driving a hydraulic motor, and the hydraulic motor is used for driving a generator to generate electricity, so that the electricity can be recycled in an electric energy mode. Thirdly, the return oil flow with higher pressure is used for driving the hydraulic motor, and then the torque and the rotating speed output by the hydraulic motor are coupled with the torque and the rotating speed of the motor for driving the hydraulic pump, so that the hydraulic motor is recycled in a mechanical energy mode. The recycling methods all involve pressure matching and rotating speed matching, the displacement of a hydraulic motor or a hydraulic transformer needs to be adjusted in real time, and a complex hydraulic control valve bank and an electric control sensing system need to be configured. In addition to the high cost and difficult adjustment, these recycling methods also have low recycling efficiency because the recycled medium-pressure return oil has more elements and complicated flow channels, which results in large pressure loss.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a simple structure, can be with the high-efficient swing arm hydraulic system who retrieves of the oil return flow of higher pressure.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a movable arm hydraulic system comprises an oil tank, a hydraulic pump, a movable arm oil cylinder, a multi-way valve, a first reversing valve and a second reversing valve, wherein an oil outlet of the hydraulic pump is communicated with an oil inlet cavity of the multi-way valve; the oil suction port of the hydraulic pump is communicated with the second reversing valve, the oil tank is communicated with one oil way of the second reversing valve, and the other oil way of the second reversing valve is communicated with one oil way of the first reversing valve.
When the pressure of the lower cavity of the movable arm oil cylinder is high (more than 3 Mpa), the first reversing valve and the second reversing valve are electrified, the lower cavity (rodless cavity) of the movable arm oil cylinder, the first reversing valve and the second reversing valve are communicated with an oil suction port of the hydraulic pump, return oil of the lower cavity (rodless cavity) of the movable arm oil cylinder directly enters a sealed working cavity of the hydraulic pump through the reversing valve, and is compressed in the sealed working cavity of the pump to form high-pressure oil which is output to the multi-way valve through an oil outlet. High-pressure oil enters a rod cavity of the movable arm oil cylinder through the operation linkage of the second movable arm of the multi-way valve, and the movable arm descends under the combined action of load gravity. Therefore, medium-pressure return oil in the lower cavity of the movable arm cylinder is directly recycled by the hydraulic pump, and the recycling efficiency is high; the energy-saving hydraulic system adopting the direct recovery mode can hardly change the original hydraulic system (only the oil way for medium-pressure return oil needs to be slightly changed), and has low cost and obvious superiority.
As a further improvement of the above technical solution:
in order to detect the pressure of the movable arm rod cavity and the pressure of the movable arm rodless cavity, the system further comprises a pilot oil source, a first pilot control valve and a second pilot control valve, wherein the first pilot control valve and the second pilot control valve are respectively communicated with the pilot oil source, the first pilot control valve is connected with a control oil port of the first movable arm linkage, a first pressure sensor is arranged on a pipeline communicated with the first pilot control valve and the first movable arm linkage, the second pilot control valve is connected with a control oil port of the second movable arm linkage, and a second pressure sensor is arranged on a pipeline communicated with the second movable arm linkage.
And a third pressure sensor is arranged on a pipeline for connecting the second movable arm link with a rod cavity of the movable arm oil cylinder, and a fourth pressure sensor is arranged on a pipeline for communicating the first reversing valve with a rodless cavity of the movable arm oil cylinder.
In order to realize the simultaneous reversing of the two reversing valves, the control ends of the first reversing valve and the second reversing valve are electrically connected with a controller.
Compared with the prior art, the utility model has the advantages of:
the utility model can directly recycle the return oil flow with higher pressure of the movable arm oil cylinder in a hydraulic energy mode, and has high recycling efficiency; the energy-saving hydraulic system adopting the direct recovery mode can hardly change the original hydraulic system (only the oil way for medium-pressure return oil needs to be slightly changed), and has low cost and obvious superiority.
Drawings
Fig. 1 is a schematic diagram of a boom hydraulic system of a conventional excavator.
Fig. 2 is a schematic diagram of the boom hydraulic system of the present invention.
Illustration of the drawings: 1. a hydraulic pump; 11. a main pump; 12. a main pump; 2. a first pilot control valve; 3. a second pilot control valve; 4. a first direction changing valve; 5. a controller; 6. a first pressure sensor; 7. a second pressure sensor; 8. A second directional control valve; 9. a multi-way valve; 91. a first boom linkage; 92. a second boom linkage; 10. an oil tank; 20. A third pressure sensor; 30. a fourth pressure sensor; 40. and a boom cylinder.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
Example (b):
as shown in fig. 2, the boom hydraulic system of the present embodiment includes an oil tank 10, a hydraulic pump 1, a boom cylinder 40, a multi-way valve 9, a first direction valve 4, a controller 5, a second direction valve 8, a pilot oil source, and a first pilot control valve 2 and a second pilot control valve 3 respectively communicating with the pilot oil source. The control ends of the first reversing valve 4 and the second reversing valve 8 are electrically connected with the controller 5.
The hydraulic pump 1 comprises a main pump 11 and a main pump 12, a first movable arm link 91 and a second movable arm link 92 are arranged in the multi-way valve 9, the main pump 11 is communicated with an oil inlet cavity of the first movable arm link 91, the main pump 12 is communicated with an oil inlet cavity of the second movable arm link 92, a working oil port of the first movable arm link 91 is communicated with an oil way of the first reversing valve 4, a working oil port of the second movable arm link 92 is communicated with a rod cavity of the movable arm cylinder 40, and a rodless cavity of the movable arm cylinder 40 is communicated with the first reversing valve 4; an oil suction port of the hydraulic pump 1 is communicated with the second reversing valve 8, an oil tank 10 is communicated with one oil path of the second reversing valve 8, and the other oil path of the second reversing valve 8 is communicated with one oil path of the first reversing valve 4.
The first pilot control valve 2 is connected with a control oil port of the first boom linkage 91, a first pressure sensor 6 is arranged on a pipeline where the first pilot control valve 2 is communicated with the first boom linkage 91, the second pilot control valve 3 is connected with a control oil port of the second boom linkage 92, and a second pressure sensor 7 is arranged on a pipeline where the second pilot control valve 3 is communicated with the second boom linkage 92.
In addition, a third pressure sensor 20 is provided on a pipeline connecting the second boom link 92 and the rod chamber of the boom cylinder 40, and a fourth pressure sensor 30 is provided on a pipeline connecting the first direction valve 4 and the rodless chamber of the boom cylinder 40.
Referring to fig. 2, when the sensor 6 detects that the pilot control oil on the oil path between the first pilot control valve 2 and the multi-way valve 9 is at a high pressure (greater than 3 Mpa) and the sensor 7 detects that the pilot control oil on the oil path between the second pilot control valve 3 and the multi-way valve 9 is at a pressure of 0 (less than 1 Mpa), the electromagnets of the first and second direction changing valves 4 and 8 are simultaneously de-energized. The hydraulic pump 1 absorbs oil from the oil tank 10, becomes high-pressure oil after being compressed by the hydraulic pump 1, and outputs the high-pressure oil to the multi-way valve 9 from an oil outlet of the hydraulic pump 1. The multi-way valve second boom operation link 92 is at the left position, the high-pressure oil enters the lower cavity of the boom cylinder 40 through the multi-way valve second boom operation link 92 to lift the boom, and the oil returned from the upper cavity of the boom cylinder returns to the tank 10 through the multi-way valve second boom operation link 92.
When the sensor 6 detects that the pilot control oil on the oil path between the first pilot control valve 2 and the multi-way valve 9 is 0 pressure (less than 1 Mpa), the sensor 7 detects that the pilot control oil on the oil path between the second pilot control valve 3 and the multi-way valve 9 is high pressure (greater than 3 Mpa), and the fourth sensor 30 detects that the pressure in the lower cavity of the boom cylinder is greater than 3Mpa, the controller 5 outputs signals to electrify the electromagnets of the first reversing valve 4 and the second reversing valve 8. The return oil in the lower cavity of the movable arm cylinder directly enters the hydraulic pump 1 through the reversing valve, is compressed into high-pressure oil in the sealed working cavity of the pump, and is output to the multi-way valve 9 through the oil outlet. The multi-way valve second boom operating link 92 is at the right position, and high-pressure oil enters the upper chamber of the boom cylinder 8 through the multi-way valve second boom operating link 92, and the boom is lowered under the combined action of the load gravity. Thus, the medium-pressure return oil in the lower cavity of the boom cylinder is directly recycled by the hydraulic pump 1.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims (4)

1. A movable arm hydraulic system is characterized by comprising an oil tank (10), a hydraulic pump (1), a movable arm oil cylinder (40), a multi-way valve (9), a first reversing valve (4) and a second reversing valve (8), wherein an oil outlet of the hydraulic pump (1) is communicated with an oil inlet cavity of the multi-way valve (9), a first movable arm link (91) and a second movable arm link (92) are arranged in the multi-way valve (9), a working oil port of the first movable arm link (91) is communicated with an oil way of the first reversing valve (4), a working oil port of the second movable arm link (92) is communicated with a rod cavity of the movable arm oil cylinder (40), and a rodless cavity of the movable arm oil cylinder (40) is communicated with the first reversing valve (4); an oil suction port of the hydraulic pump (1) is communicated with the second reversing valve (8), the oil tank (10) is communicated with one oil way of the second reversing valve (8), and the other oil way of the second reversing valve (8) is communicated with one oil way of the first reversing valve (4).
2. The boom hydraulic system according to claim 1, further comprising a pilot oil source, and a first pilot control valve (2) and a second pilot control valve (3) which are respectively communicated with the pilot oil source, wherein the first pilot control valve (2) is connected with a control oil port of the first boom linkage (91), a first pressure sensor (6) is arranged on a pipeline of the first pilot control valve (2) communicated with the first boom linkage (91), the second pilot control valve (3) is connected with a control oil port of the second boom linkage (92), and a second pressure sensor (7) is arranged on a pipeline of the second pilot control valve (3) communicated with the second boom linkage (92).
3. The boom hydraulic system according to claim 2, wherein a third pressure sensor (20) is provided on a pipeline connecting the second boom link (92) and the rod chamber of the boom cylinder (40), and a fourth pressure sensor (30) is provided on a pipeline connecting the first directional control valve (4) and the rodless chamber of the boom cylinder (40).
4. The boom hydraulic system according to any one of claims 1 to 3, characterized in that the control ends of the first and second directional valves (4, 8) are electrically connected to a controller (5).
CN201922243837.XU 2019-12-13 2019-12-13 Movable arm hydraulic system Active CN211421227U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922243837.XU CN211421227U (en) 2019-12-13 2019-12-13 Movable arm hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922243837.XU CN211421227U (en) 2019-12-13 2019-12-13 Movable arm hydraulic system

Publications (1)

Publication Number Publication Date
CN211421227U true CN211421227U (en) 2020-09-04

Family

ID=72275806

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922243837.XU Active CN211421227U (en) 2019-12-13 2019-12-13 Movable arm hydraulic system

Country Status (1)

Country Link
CN (1) CN211421227U (en)

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