A hydraulic system with total power control

Abstract

The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic system with total power control, wherein a first variable pump (2) outputs to a first multi-way valve (6) through a first pipeline (8), a second variable pump (4) outputs to a second multi-way valve (7) through a second pipeline (9), the first power controller (3) is arranged in the first variable pump (2), and the first variable pump (2) is connected to the first power controller (3), the second power controller (5) is arranged in the second variable pump (4), and the second variable pump (4) is connected to the second power controller (5), and the second variable pump (4) is also connected to the first power controller (3) through a second pipeline (9). This hydraulic system can enable each pump to maximize the motor power, so that a smaller motor power can be used to meet the power requirements of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic system with total power control. Background Art

[0002] As the power source for providing energy for the main motion system and the auxiliary motion system in the hydraulic system of the drilling rig, the motor in the hydraulic system of the drilling rig has a fixed power and a constant speed, that is, the sum of the actual power consumption of all pumps cannot exceed the rated power of the motor. In the prior art, the motor power is controlled by the independent power control of each sub-pump, that is, the rated power output by the motor is equal to the sum of the power of each sub-pump, and the maximum power of each pump is determined by the maximum pressure and flow set by the sub-pump. In order to prevent the motor from exceeding the rated power, the setting value of the maximum power of each sub-pump is often very low, so that the motor power cannot be fully utilized. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic system with total power control, which can enable each pump to maximize the motor power and meet the power requirements of the equipment with a smaller motor power.

[0004] The technical solution adopted by the present invention is: a hydraulic system with total power control, which includes a motor, a first variable pump, a second variable pump, a first multi-way valve, a second multi-way valve, a first pipeline, a second pipeline, a first power controller and a second power controller, the motor is connected to the first variable pump and the second variable pump, the first variable pump outputs pressure oil to the first multi-way valve through the first pipeline, the second variable pump outputs pressure oil to the second multi-way valve through the second pipeline, the first power controller is integrated in the first variable pump, and the first variable pump is connected to the first power controller through an internal flow channel, the second power controller is integrated in the second variable pump, and the second variable pump is connected to the second power controller through the internal flow channel, and the second variable pump is also connected to the first power controller through the second pipeline.

[0005] Compared with the prior art, the present invention has the following advantages: by using different power controllers to control the power usage of the first variable pump and the second variable pump, the first variable pump can use the full power of the motor at most, and the circuit where the second variable pump is located can meet both normal working conditions and the use of the first variable pump when a high pressure state is required.

[0006] Preferably, a first flow controller is provided in the first variable pump, one end of the first flow controller is connected to the first pipeline, and the other end of the first flow controller is connected to the first multi-way valve through a third pipeline. The first flow controller is provided in the first variable pump, so that the control effect is better.

[0007] Preferably, a first pressure controller is further provided in the first multi-way valve, one end of the first pressure controller is connected to the third pipeline, and the other end of the first pressure controller is connected to the oil return pipeline of the first multi-way valve. The first pressure controller is provided in the first multi-way valve, so that the control effect is better.

[0008] Preferably, the second variable pump is provided with a second flow controller, one end of the second flow controller is connected to the second pipeline, and the other end of the second flow controller is connected to the second multi-way valve through a fourth pipeline. The second flow controller is provided in the second variable pump, so that the control effect is better.

[0009] Preferably, a second pressure controller is further provided in the second multi-way valve, one end of the second pressure controller is connected to the fourth pipeline, and the other end of the second pressure controller is connected to the oil return pipeline of the second multi-way valve. The second pressure controller is provided in the second multi-way valve, so that the control effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The figure is a schematic diagram of the principle of a hydraulic system with total power control according to the present invention.

[0011] As shown in the figure: 1. Motor; 2. First variable pump; 3. First power controller; 4. Second variable pump; 5. Second power controller; 6. First multi-way valve; 7. Second multi-way valve; 8. First pipeline; 9. Second pipeline; 10. First flow controller; 11. Second flow controller; 12. Second pressure controller; 13. First pressure controller; 14. Fourth pipeline; 15. Third pipeline. DETAILED DESCRIPTION

[0012] The present invention is further described below through specific implementation modes, but the present invention is not limited to the following specific implementation modes.

[0013] like Figure 1 As shown, a total power controlled hydraulic system of the present invention includes a motor 1, a first variable pump 2, a second variable pump 4, a first multi-way valve 6, a second multi-way valve 7, a first pipeline 8, a second pipeline 9, a third pipeline 15, a fourth pipeline 14, a first power controller 3, a second power controller 5, a first flow controller 10, a second flow controller 11, a first pressure controller 13 and a second pressure controller 12,

[0014] The motor 1 is connected to the first variable pump 2 and the second variable pump 4. The first variable pump 2 outputs pressure oil to control the excavation arm cylinder through the first multi-way valve 6, and the second variable pump 4 outputs pressure oil to control the delivery tank hydraulic motor through the second multi-way valve 7.

[0015] The first power controller 3 is integrated in the first variable pump 2 for controlling the total power and the power of the second variable pump 4, and the second power controller 5 is integrated in the second variable pump 4 for controlling the power of the second variable pump 4;

[0016] The power of the second variable pump 4 set by the first power controller 3 in the first variable pump 2 is equal to or close to the power of the second variable pump 4 set by the second power controller 5 in the second variable pump 4 .

[0017] The pressure oil signal of the second variable pump 4 is input to the first power controller 3 of the first variable pump 2 through the second pipeline 9.

[0018] The first flow controller 10 is arranged in the first variable pump 2, one end of which is connected to the first pipeline 8, and the other end is connected to the third pipeline 15, and the output port is connected to the swash plate of the first variable pump 2 to control the flow by comparing the pressure difference between the first pipeline 8 and the third pipeline 15. When the pressure of the first pipeline 8 minus the third pipeline 15 is greater than the preset pressure, the first flow controller 10 outputs the pressure to control the swash plate of the first variable pump 2 to reduce the flow, and the first flow controller 10 in the first variable pump 2 takes precedence over the first power controller 3 in controlling the swash plate swing angle of the pump;

[0019] The second flow controller 11 is arranged in the second variable pump 4, one end of which is connected to the second pipeline 9, and the other end is connected to the fourth pipeline 14, and the output port is connected to the swash plate of the second variable pump 4 to control the flow by comparing the pressure difference between the second pipeline 9 and the fourth pipeline 14. When the pressure of the second pipeline 9 minus the fourth pipeline 14 is greater than the preset pressure, the second flow controller 11 outputs the pressure to control the swash plate of the second variable pump 4 to reduce the flow, and the second flow controller 11 in the second variable pump 4 takes precedence over the second power controller 5 in controlling the swash plate swing angle of the pump;

[0020] The first pressure controller 13 is actually a pressure cut-off valve, one end of which is connected to the third pipeline 15 and the other end is connected to the oil return pipeline of the first multi-way valve 6;

[0021] The second pressure controller 12 is actually also a pressure cut-off valve, one end of which is connected to the fourth pipeline 14, and the other end is connected to the return oil pipeline of the second multi-way valve 7;

[0022] In the present hydraulic system, the circuit composed of the first variable pump 2 and the first multi-way valve 6 is a main action circuit using high power, and the circuit composed of the second variable pump 4 and the second multi-way valve 7 is an auxiliary action circuit using low power and occasionally using high pressure. In order to increase the power of the circuit where the first variable pump 2 is located, the first power controller 3 can be adjusted, and the second pipeline 9 inputs the pressure oil signal of the circuit composed of the second variable pump 4 and the second multi-way valve 7 into the first power controller 3. When the pressure power used by the second variable pump 4 is lower than the power of the second variable pump 4 set by the first power controller 3, the second variable pump 4 gives the first power controller 3 a pressure corresponding to the actual power through the second pipeline 9, thereby increasing the usable power of the first variable pump 2; when the external load power used by the second variable pump 4 is higher than the power of the second variable pump 4 set by the first power controller 3, the second variable pump 4 gives the first power controller 3 a pressure through the second pipeline 9, and the first power controller 3 only reads the pressure corresponding to the set power. When the external load power used is higher than the set power of the second power controller 5, the flow rate decreases with the increase of pressure to keep the power of the second variable pump 4 constant, and the first variable pump 2 will not stop due to the excessive pressure of the second variable pump 4.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic system with total power control, characterized in that: It comprises a motor (1), a first variable pump (2), a second variable pump (4), a first multi-way valve (6), a second multi-way valve (7), a first pipeline (8), a second pipeline (9), a first power controller (3) and a second power controller (5); the motor (1) is connected to the first variable pump (2) and the second variable pump (4); the pressure oil output by the first variable pump (2) is output to the first multi-way valve (6) through the first pipeline (8); the pressure oil output by the second variable pump (4) is output to the second multi-way valve (7) through the second pipeline (9); the first power controller (3) is integrated in the first variable pump (2), and the first variable pump (2) is connected to the first power controller (3) through an internal flow channel; the second power controller (5) is integrated in the second variable pump (4), and the second variable pump (4) is connected to the second power controller (5) through an internal flow channel; and the second variable pump (4) is also connected to the first power controller (3) through the second pipeline (9); The first power controller (3) is used to control the total power and the power of the second variable pump (4), and the second power controller (5) is used to control the power of the second variable pump (4); The circuit formed by the first variable pump (2) and the first multi-way valve (6) is a main action circuit using high power, and the circuit formed by the second variable pump (4) and the second multi-way valve (7) is an auxiliary action circuit using low power and occasionally high pressure.

2. A hydraulic system with total power control according to claim 1, characterized in that: The first variable pump (2) is provided with a first flow controller (10), one end of the first flow controller (10) is connected to the first pipeline (8), and the other end of the first flow controller (10) is connected to the first multi-way valve (7) via a third pipeline (15).

3. A hydraulic system with total power control according to claim 2, characterized in that: A first pressure controller (13) is also provided in the first multi-way valve (6); one end of the first pressure controller (13) is connected to the third pipeline (15), and the other end of the first pressure controller (13) is connected to the oil return pipeline of the first multi-way valve (6).

4. A hydraulic system with total power control according to claim 1, characterized in that: The second variable pump (4) is provided with a second flow controller (11), one end of the second flow controller (11) is connected to the second pipeline (9), and the other end of the second flow controller (11) is connected to the second multi-way valve (7) via a fourth pipeline (14).

5. A hydraulic system with total power control according to claim 4, characterized in that: A second pressure controller (12) is also provided in the second multi-way valve (7); one end of the second pressure controller (12) is connected to the fourth pipeline (14), and the other end of the second pressure controller (12) is connected to the oil return pipeline of the second multi-way valve (7).

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