CN210196160U - Hydraulic system and engineering machinery based on negative flow control - Google Patents
Hydraulic system and engineering machinery based on negative flow control Download PDFInfo
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- CN210196160U CN210196160U CN201920991412.4U CN201920991412U CN210196160U CN 210196160 U CN210196160 U CN 210196160U CN 201920991412 U CN201920991412 U CN 201920991412U CN 210196160 U CN210196160 U CN 210196160U
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Abstract
The utility model discloses a hydraulic system and engineering machine tool based on burden flow control belongs to engineering machine tool hydraulic system technical field. A CF port of the priority valve is connected with a first execution mechanism, an EF port of the priority valve is connected with a control valve, and the control valve is connected with a second execution mechanism; the controller is connected with the power unit in a control mode; a control valve: the oil port A and the oil port B are connected with a first actuating mechanism, and the oil port P is connected with an EF port of a priority valve; a safety valve and a flow valve I are sequentially connected between the oil port P and the oil port T2; a pressure sensor I is connected in an oil duct between the safety valve and the flow valve I; a detection unit: a flow valve II is connected between the oil port P1 and the oil port T; the pressure sensor II is connected with the oil port P1. The power unit of the utility model adopts the form of the motor and the hydraulic pump, is not limited to the plunger pump, and reduces the cost of the power unit; the pipeline connection is simple, the cost is low, in the system, the oil return amount in the middle position of the control valve keeps a very small value, and the power loss of the system is greatly reduced.
Description
Technical Field
The utility model relates to an engineering machine tool hydraulic system technical field specifically is a hydraulic system and engineering machine tool based on negative flow control.
Background
Various power losses exist in the hydraulic system, and the energy-saving technology is adopted, so that the oil consumption can be reduced, the power loss of the hydraulic system is reduced, the power utilization is improved, the system efficiency is reasonably utilized, the reliability of hydraulic parts can be improved, and the economic loss of customers can be reduced.
At present, the improvement of a hydraulic system is improved mainly from a quantitative system to a variable system, the energy-saving aim is achieved, and the power matching between a power source and a load is still in a primary stage.
The prior variable system technology has the following problems:
1, variable plunger pumps are mostly adopted in a variable system, so that the cost is high, the requirement on the cleanliness of the system is high, and the difficulty in maintenance is high;
2, for a hydraulic system with multiple actuating mechanisms, a variable feedback system is complex, the degree of matching between the variable feedback system and the hydraulic system is poor, the operating efficiency is low, and the cost is high.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a hydraulic system and engineering machine tool based on negative flow control.
The utility model discloses a following technical scheme realizes: a hydraulic system based on negative flow control comprises a priority valve and a power unit for supplying oil to the priority valve; the CF port of the priority valve is connected with a first actuating mechanism, and the EF port of the priority valve is connected with a second actuating mechanism;
the device also comprises a control valve, a flow detection unit and a controller for controlling the power unit;
the control valve comprises an oil port A, an oil port B, an oil port P, an oil port T1 and an oil port T2; the oil port A and the oil port B are connected with a first actuating mechanism, and the oil port P is connected with an EF port of a priority valve; a safety valve and a flow valve I are sequentially connected between the oil port P and the oil port T2; a pressure sensor I is connected in an oil passage between the safety valve and the flow valve I; the signal output end of the pressure sensor I is connected with the controller;
the detection unit comprises an oil port P1 and an oil port T, and a flow valve II is connected between the oil port P1 and the oil port T; the flow detection unit also comprises a pressure sensor II connected with an oil port P1; and the signal output end of the pressure sensor II is connected with the controller.
It further comprises the following steps: an oil port P2 is arranged on an oil passage between the flow valve II and the oil port T in the detection unit, and the oil port T2 in the control valve is communicated with the oil port P2 of the detection unit.
The power unit comprises a motor and a hydraulic pump connected with the motor, and the controller is connected with the motor in a control mode.
The oil inlet of the hydraulic pump is connected with an oil tank, and an oil return port of the oil tank is connected with an oil return filter.
The pressure sensor I adopts pSENS DAVE 300.
The pressure sensor II adopts pSENS DAVE 300.
The controller adopts MC 050.
A work machine includes a hydraulic system based on negative flow control.
The utility model discloses a power pack provides system flow, combines burden flow control principle, through the surplus flow of pressure flow valve detecting system to give the controller with the signal transmission, realize the flow control of adjusting the power supply by the controller, realize the self-adaptation control of system flow. In the system, the oil return amount in the middle position of the control valve is kept to be a small value, so that the power loss of the system is greatly reduced.
Compared with the prior art, the beneficial effects of the utility model are that: the power unit adopts the forms of a motor and a hydraulic pump, is not limited to a plunger pump, and reduces the cost of the power unit; the pipeline connection is succinct, and the cost is lower, and is resistant to pollution, and power loss is low, and market acceptance is high, and the practicality is strong.
Drawings
FIG. 1 is a schematic diagram of the present invention;
in the figure: the device comprises an oil tank 1, an oil return filter 2, a power unit 3, a control valve 4, a safety valve 4.1, a flow valve I4.2, a pressure sensor I4.3, a flow detection unit 5, a flow valve II 5.1, a pressure sensor II 5.2, a controller 6 and a priority valve 7.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
Example one
As shown in fig. 1, in a hydraulic system based on negative flow control, a power unit 3 includes an electric motor and a hydraulic pump connected to the electric motor, and the electric motor drives the hydraulic pump to operate. The oil inlet of the hydraulic pump absorbs oil from the oil tank 1, and the oil return port of the oil tank 1 is connected with the oil return filter 2. The first actuator is connected with a port CF of the priority valve 7, the control valve 4 is connected with a port EF of the priority valve 7, and the second actuator is connected with the control valve 4.
The control valve 4 has an oil port a, an oil port B, an oil port P, an oil port T1, and an oil port T2; the oil port A and the oil port B are connected with the first actuating mechanism, and the oil port P is connected with the port 7EF of the priority valve. A safety valve 4.1 and a flow valve I4.2 are sequentially connected between the oil port P and the oil port T2; a pressure sensor I4.3 is connected in the oil channel between the safety valve 4.1 and the flow valve I4.2. The signal output end of the pressure sensor I4.3 is connected with the controller 6.
The detection unit 5 has an oil port P1, an oil port P2, and an oil port T; and a flow valve II 5.1 is connected between the oil port P1 and the oil port 2, and a pressure sensor II 5.2 is connected with the oil port P1. And the signal output end of the pressure sensor II 5.2 is connected with the controller 6. The oil port P2 is communicated with the oil port T, and the oil port T2 in the control valve 4 is communicated with the oil port P2 of the flow detection unit 5.
pSENS DAVE 300 was specifically used for pressure sensor I4.3. pSENSDAVE 300 was specifically used for pressure sensor II 5.2. The controller 6 is specifically MC 050.
The working principle is as follows:
when only the first actuating mechanism serves as an actuating element;
the power unit 3 provides flow to the first actuator through the CF port of the priority valve 7, surplus flow provided by the power unit 3 passes through the CF port of the priority valve 7 and then passes through the middle position loop T1 of the control valve 4 to the detection unit 5, the surplus flow passes through the middle flow valve II 5.1 of the detection unit 5 to form pressure difference, the pressure sensor II 5.2 in the detection unit 5 converts a pressure signal into an electric signal and outputs the electric signal to the controller 6, the controller 6 receives the output signal of the pressure sensor II 5.2 of the detection unit 5 and then outputs a control signal, and the flow output by the power unit 3 is adjusted to meet the requirement of the first actuator.
When only the second actuating mechanism is used as an actuating element;
the power unit 3 provides flow through the EF port of the priority valve 7 to the P port of the valve 4, the control valve 4 is in the speed regulation zone,
the flow of a middle position loop T1 of the control valve 4 passes through the pressure formed by a sensor II 5.2, the pressure sensor II 5.2 in the unit 5 converts a pressure signal into an electric signal and outputs the electric signal to the controller 6, the controller 6 receives the signal and outputs the signal to the power unit 3, and the power unit 3 is adjusted to output a corresponding flow to be supplied to the actuating mechanism II;
when the control valve 4 is not in the speed regulation zone,
the middle oil return amount of the control valve 4 is 0, the negative flow control is not effective, the pressure detected by the sensor 6 is 0 and outputs a signal to the controller 6, the controller 6 receives the signal and outputs a control signal, and the flow of the power unit 3 is adjusted to meet the requirement of the second execution mechanism;
when the working pressure of the second actuating mechanism reaches the set value of the safety valve 4.1 in the control valve 4, the safety valve 4.1 overflows, the overflow flow rate forms a pressure difference through the flow valve I4.2, the pressure sensor I4.3 converts a pressure signal into an electric signal to be detected and output to the controller 6, and the controller 6 outputs a signal to adjust the adaptive flow rate of the power unit 3 to meet the requirement of the second actuating mechanism.
When the first actuating mechanism and the second actuating mechanism work simultaneously;
the output flow of the power unit 3 is preferentially supplied to the first actuating mechanism through an EF port of the priority valve 7, and then is supplied to the second actuating mechanism through an EF port of the priority valve 7 to a P port of the control valve 4, and in combination with negative flow control, the pressure sensor II 5.2 of the control valve 4 and the pressure sensor I4.3 of the control valve 4 output control signals to the controller 6, the controller 6 outputs the control signals, and the output adaptive flow of the power unit 3 is adjusted to meet the requirements of the first actuating mechanism and the second actuating mechanism.
Example two
A working machine comprises a hydraulic system based on negative flow control in the embodiment.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and different embodiments can be obtained by performing targeted adjustment according to actual needs. This is not illustrated here, since many implementations are possible.
Claims (8)
1. A negative flow control based hydraulic system comprising a power unit (3);
the method is characterized in that:
the device also comprises a control valve (4), a flow detection unit (5) and a controller (6) for controlling and connecting the power unit (3);
the control valve (4) comprises an oil port A, an oil port B, an oil port P, an oil port T1 and an oil port T2; the oil port A and the oil port B are connected with a first actuating mechanism, and the oil port P is connected with an EF port of a priority valve (7); a safety valve (4.1) and a flow valve I (4.2) are sequentially connected between the oil port P and the oil port T2; a pressure sensor I (4.3) is connected in an oil passage between the safety valve (4.1) and the flow valve I (4.2); the signal output end of the pressure sensor I (4.3) is connected with the controller (6);
the detection unit (5) comprises an oil port P1 and an oil port T, and a flow valve II (5.1) is connected between the oil port P1 and the oil port T; the flow detection unit (5) also comprises a pressure sensor II (5.2) connected with the oil port P1; and the signal output end of the pressure sensor II (5.2) is connected with the controller (6).
2. The negative flow control-based hydraulic system of claim 1, wherein: an oil port P2 is formed in an oil passage between the flow valve II (5.1) and the oil port T in the detection unit (5), and the oil port T2 in the control valve (4) is communicated with the oil port P2 of the detection unit (5).
3. The negative flow control-based hydraulic system of claim 1, wherein: the power unit (3) comprises a motor and a hydraulic pump connected with the motor, and the controller is connected with the motor in a control mode.
4. A hydraulic system based on negative flow control according to claim 3, wherein: the oil inlet of the hydraulic pump is connected with an oil tank (1), and an oil return port of the oil tank (1) is connected with an oil return filter (2).
5. The negative flow control-based hydraulic system of claim 1, wherein: the pressure sensor I (4.3) employs pSENS DAVE 300.
6. The negative flow control-based hydraulic system of claim 1, wherein: the pressure sensor II (5.2) used pSENS DAVE 300.
7. The negative flow control-based hydraulic system of claim 1, wherein: the controller (6) adopts MC 050.
8. A construction machine characterized in that: a hydraulic system including a negative flow control based hydraulic system as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920991412.4U CN210196160U (en) | 2019-06-28 | 2019-06-28 | Hydraulic system and engineering machinery based on negative flow control |
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| CN201920991412.4U CN210196160U (en) | 2019-06-28 | 2019-06-28 | Hydraulic system and engineering machinery based on negative flow control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307198A (en) * | 2019-06-28 | 2019-10-08 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering machinery based on inverted flux control |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307198A (en) * | 2019-06-28 | 2019-10-08 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering machinery based on inverted flux control |
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