Hydraulic motor control system

Abstract

The utility model discloses a hydraulic motor control system, which relates to the technical field of bulldozer hydraulic pressure, and comprises a main pipeline, a first electromagnetic valve, a second electromagnetic valve, a first two-way cartridge valve, a second two-way cartridge valve, a third two-way cartridge valve and a first three-way cartridge valve, a port A of the first electromagnetic valve is connected with a control oil port of the first two-way cartridge valve, a second oil inlet and outlet of the first two-way cartridge valve is connected with the main pipeline, a port B of the first electromagnetic valve is connected with a control oil port of the first three-way cartridge valve, and a first oil inlet and outlet of the first two-way cartridge valve is connected with a first oil port of the hydraulic motor. Forward and reverse rotation of the hydraulic motor is controlled through the first electromagnetic valve and the second electromagnetic valve, part of hydraulic oil flowing out of the hydraulic motor is supplemented into the hydraulic motor through the first one-way valve or the second one-way valve, and the situation that the motor easily sucks air is avoided.

Description

Technical Field

[0001] The present application relates to the field of bulldozer hydraulic technology, and in particular to a hydraulic motor control system. Background Art

[0002] The statements in this section merely provide background technical information related to the present application and do not necessarily constitute prior art.

[0003] During bulldozer operation, in order to achieve different speeds and directions of the cooling fan under different environments, a hydraulic motor control system is generally set in front of the hydraulic motor to realize the forward, reverse and stop of the hydraulic motor. However, the existing hydraulic motor control system uses a two-position four-way valve to connect two two-position cartridge valves to control the direction of the hydraulic motor. In such a system, the two-position four-way valve is used to switch the two two-position cartridge valves to change the flow direction of the hydraulic oil so that the hydraulic oil enters from different oil inlets of the hydraulic motor to achieve the effect of forward, reverse and stop of the hydraulic motor. However, there is no supplementary pipeline in the pipeline in the system, which will cause the motor to be easily sucked after each stop and start. After sucking, there will be bubbles in the hydraulic oil. The bursting of the bubbles will cause the hydraulic motor to be cavitated and generate noise. A large amount of air enters the hydraulic motor, which will aggravate the cavitation, increase the compressibility of the hydraulic oil, make the hydraulic motor unstable, reduce the working efficiency, and affect the service life of the hydraulic motor. Therefore, it is necessary to design a hydraulic motor control system that can prevent the hydraulic motor from sucking air. Utility Model Content

[0004] In order to solve the above problems, the present application proposes a hydraulic motor control system.

[0005] The purpose of the present application is to provide a hydraulic motor control system, which controls the forward and reverse rotation of the hydraulic motor through a first solenoid valve and a second solenoid valve, and a part of the hydraulic oil flowing out of the hydraulic motor is replenished back into the hydraulic motor through the first one-way valve or the second one-way valve, thereby avoiding the phenomenon that the motor is easily sucked into air and the noise generated after sucking into air, thereby improving the working efficiency of the motor; and a part of the hydraulic oil is returned to the return oil pipeline through the third two-way cartridge valve and the first three-way cartridge valve, thereby reducing the oil pressure of the entire system and increasing the service life.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] A hydraulic motor control system, comprising: a main line, a first solenoid valve, a second solenoid valve, a first two-way cartridge valve, a second two-way cartridge valve, a third two-way cartridge valve, and a first three-way cartridge valve, wherein the P ports of the first solenoid valve and the second solenoid valve are connected to the main line in parallel, the A port of the first solenoid valve is connected to the control oil port of the first two-way cartridge valve, the second oil inlet and outlet of the first two-way cartridge valve is connected to the main line, the B port of the first solenoid valve is connected to the control oil port of the first three-way cartridge valve, the first oil inlet and outlet of the first two-way cartridge valve is connected to the first oil port of the hydraulic motor, and the second oil inlet and outlet of the first three-way cartridge valve is connected to the first oil port of the hydraulic motor;

[0008] Therefore, port A of the second solenoid valve is connected to the control oil port of the third two-way cartridge valve, port B of the second solenoid valve is connected to the control oil port of the second two-way cartridge valve, the second inlet and outlet oil ports of the second two-way cartridge valve are connected to the main pipeline, the first inlet and outlet oil ports of the second two-way cartridge valve are connected to the second oil port of the motor, the second inlet and outlet oil ports of the third two-way cartridge valve are connected to the second oil port of the hydraulic motor, and the first inlet and outlet oil ports of the third two-way cartridge valve are connected to the third inlet and outlet oil ports of the first three-way cartridge valve.

[0009] As a further preferred embodiment, it also includes an oil return pipeline, wherein an overflow valve and a second three-way cartridge valve are provided on the oil return pipeline, the first oil inlet and outlet of the first three-way cartridge valve are connected to the third oil inlet and outlet of the second three-way cartridge valve, the control oil port of the second three-way cartridge valve is connected to the overflow valve, the oil outlet of the overflow valve is connected to the oil return pipeline, the first oil inlet and outlet of the second three-way cartridge valve are connected to the oil return pipeline, and the second oil inlet and outlet of the second three-way cartridge valve is connected to the main pipeline, so that the hydraulic oil pressure in the main pipeline can be shared by the second three-way cartridge valve to prevent the excessive pressure of the hydraulic oil in the main pipeline from affecting the hydraulic motor.

[0010] As a further preferred embodiment, a first one-way valve and a second one-way valve are also provided, wherein the first one-way valve is located between the second oil inlet and outlet and the first oil inlet and outlet of the third two-way cartridge valve, and the second one-way valve is located between the second oil inlet and outlet and the first oil inlet and outlet of the first three-way cartridge valve.

[0011] As a further preference, the main pipe is also provided with a pressure measuring port, which is used to connect a measuring instrument to monitor the pressure of the main pipe.

[0012] As further preferred, the first solenoid valve and the second solenoid valve are two-position four-way solenoid valves, the P port of the first solenoid valve is the oil inlet port, the T port is the oil return port, the oil return port is connected to the oil tank, and the A port and the B port are the working oil ports.

[0013] As a further preference, the hydraulic motor is also provided with an overflow port, and the overflow port is connected to the oil tank.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] 1. The present application controls the forward and reverse rotation of the hydraulic motor through the first solenoid valve and the second solenoid valve, and through the oil replenishment of the third two-way cartridge valve and the first three-way cartridge valve, a part of the hydraulic oil flowing out of the hydraulic motor is replenished back to the hydraulic motor through the first one-way valve or the second one-way valve, thereby avoiding the phenomenon that the motor is easily sucked into air and the noise generated after sucking into air, thereby improving the working efficiency of the motor, and a part of the hydraulic oil is returned to the return oil pipeline through the third two-way cartridge valve and the first three-way cartridge valve, thereby reducing the oil pressure of the entire system and improving the service life.

[0016] 2. In this application, the second solenoid valve is energized and the first solenoid valve is not energized, so that the hydraulic motor reaches a stopped state, which is more energy-efficient. At the same time, by adding a relief valve and a second three-way cartridge valve, the entire system can be depressurized in time to protect the safety of the hydraulic pump after the motor stops or the valve block fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the hydraulic working principle diagram of this application;

[0018] Figure 2 A schematic diagram of a two-way cartridge valve for this application;

[0019] Figure 3 A schematic diagram of a three-way cartridge valve of the present application;

[0020] Among them: 1. main line, 2. first solenoid valve, 3. second solenoid valve, 4. first two-way cartridge valve, 5. second two-way cartridge valve, 6. third two-way cartridge valve, 7. first three-way cartridge valve, 8. second three-way cartridge valve, 9. relief valve, 10. hydraulic motor, 11. first oil port, 12. second oil port, 13. control oil port, 14. first inlet and outlet oil ports, 15. second inlet and outlet oil ports, 16. third inlet and outlet oil ports, 17. oil return line, 18. first check valve, 19. second check valve. DETAILED DESCRIPTION

[0021] The present application is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0022] A hydraulic motor control system, such as Figure 1-3As shown, it includes: a main line 1, a first solenoid valve 2, a second solenoid valve 3, a first two-way cartridge valve 4, a second two-way cartridge valve 5, a third two-way cartridge valve 6, and a first three-way cartridge valve 7. The P ports of the first solenoid valve 2 and the second solenoid valve 3 are connected to the main line 1 in parallel, and the main line 1 is connected to a hydraulic pump, which delivers hydraulic oil. The A port of the first solenoid valve 2 is connected to the control oil port 13 of the first two-way cartridge valve 4, and the second oil inlet and outlet ports 15 of the first two-way cartridge valve 4 are connected to the main line 1. The B port of the first solenoid valve 2 is connected to the control oil port 13 of the first three-way cartridge valve 7, and the first oil inlet and outlet ports 14 of the first two-way cartridge valve 4 are connected to the first oil port 11 of the hydraulic motor 10. The second oil inlet and outlet ports 15 of the first three-way cartridge valve 7 are connected to the first oil port 11 of the hydraulic motor 10.

[0023] Therefore, port A of the second solenoid valve 3 is connected to the control oil port 13 of the third two-way cartridge valve 6, port B of the second solenoid valve 3 is connected to the control oil port 13 of the second two-way cartridge valve 5, the second inlet and outlet oil ports 15 of the second two-way cartridge valve 5 are connected to the main pipeline 1, the first inlet and outlet oil ports 14 of the second two-way cartridge valve 5 are connected to the second oil port 12 of the motor, the second inlet and outlet oil ports 15 of the third two-way cartridge valve 6 are connected to the second oil port 12 of the hydraulic motor 10, and the first inlet and outlet oil ports 14 of the third two-way cartridge valve 6 are connected to the third inlet and outlet oil ports 16 of the first three-way cartridge valve 7.

[0024] like Figure 1 As shown, it also includes an oil return pipeline 17, on which an overflow valve 9 and a second three-way cartridge valve 8 are provided, the first oil inlet and outlet 14 of the first three-way cartridge valve 7 is connected to the third oil inlet and outlet 16 of the second three-way cartridge valve 8, the control oil port 13 of the second three-way cartridge valve 8 is connected to the overflow valve 9, the oil outlet of the overflow valve 9 is connected to the oil return pipeline 17, the first oil inlet and outlet 14 of the second three-way cartridge valve 8 is connected to the oil return pipeline 17, and the second oil inlet and outlet 15 of the second three-way cartridge valve 8 is connected to the main pipeline 1, so that the hydraulic oil pressure in the main pipeline 1 can be shared by the second three-way cartridge valve 8 to prevent the excessive pressure of the hydraulic oil in the main pipeline 1 from affecting the hydraulic motor 10.

[0025] like Figure 1 As shown, a first one-way valve 18 and a second one-way valve 1919 are also provided. The first one-way valve 18 is located between the second oil inlet and outlet 15 and the first oil inlet and outlet 14 of the third two-way cartridge valve 6, and the second one-way valve 1919 is located between the second oil inlet and outlet 15 and the first oil inlet and outlet 14 of the first three-way cartridge valve 7.

[0026] The main pipe 1 is also provided with a pressure measuring port, which is used to connect a measuring instrument to monitor the pressure of the main pipe 1 .

[0027] like Figure 1 As shown, the first solenoid valve 2 and the second solenoid valve 3 are two-position four-way solenoid valves, the P port of the first solenoid valve 2 is the oil inlet port, the T port is the oil return port, the oil return port is connected to the oil tank, and the A port and the B port are the working oil ports.

[0028] The hydraulic motor 10 is also provided with an overflow port, and the overflow port is connected to the oil tank.

[0029] like Figure 2 As shown, the first two-way cartridge valve 4 includes a control oil port 13 , a first oil inlet and outlet port 14 , and a second oil inlet and outlet port 15 .

[0030] like Figure 3 As shown, the first three-way cartridge valve 7 includes a control oil port 13 , a first oil inlet and outlet port 14 , a second oil inlet and outlet port 15 and a third oil inlet and outlet port 16 .

[0031] When the hydraulic motor 10 rotates forward, both solenoid valves need to be de-energized. The power oil in the main pipeline 1 enters from the P port of the first solenoid valve 2, and then enters the control oil port 13 of the first two-way cartridge valve 4 through the A port of the first solenoid valve 2. At this time, the oil pressure of the second inlet and outlet oil ports 15 of the first two-way cartridge valve 4 connected to the main pipeline 1 is the same as the oil pressure of the control oil port 13 of the first two-way cartridge valve 4, both of which are the oil pressure on the main pipeline 1. The oil pressures at the two positions are the same, so the first inlet and outlet oil ports 14 of the first two-way cartridge valve 4 cannot be opened, and thus the first oil port 11 of the first hydraulic motor 10 cannot be supplied with oil.

[0032] The hydraulic oil enters the second solenoid valve 3 and the second two-way cartridge valve 5 from the main line 1, enters from the P port of the second solenoid valve 3 and flows out from the A port, enters the control oil port 13 of the third two-way cartridge valve 6, and closes the third two-way cartridge valve 6.

[0033] At the same time, the oil pressure of the second oil inlet and outlet 15 of the second two-way cartridge valve 5 is the oil pressure of the main line 1, and the control oil port 13 of the second two-way cartridge valve 5 is connected to the B port of the second solenoid valve 3. Since the second solenoid valve 3 is not powered, the B port of the second solenoid valve 3 is connected to the T port, and the oil pressure at the T port is the oil pressure of the oil tank. The oil pressure of the oil tank is lower than the oil pressure of the main line 1. Therefore, the spring in the second two-way cartridge valve 5 is compressed, so that the oil in the spring cavity flows back to the oil tank through the oil return port T of the second solenoid valve 3. The first oil inlet and outlet 14 of the second two-way cartridge valve 5 is opened, and the hydraulic oil is discharged from the second two-way cartridge valve 5 to the oil return port T. The second liquid inlet and outlet flows to the first liquid inlet and outlet and finally enters the second liquid inlet of the hydraulic motor 10, so that the hydraulic motor 10 rotates forward, and the hydraulic oil flows out from the first oil port 11 of the hydraulic motor 10 and enters the second oil inlet and outlet 15 of the first three-way cartridge valve 7. A part of the hydraulic oil flows to the return oil pipeline 17 through the first oil inlet and outlet 14 of the first three-way cartridge valve 7, and a part of the hydraulic oil flows to the third two-way cartridge valve 6 through the third oil inlet and outlet 16 of the first three-way cartridge valve 7, and flows to the second oil port 12 of the hydraulic motor 10 through the first check valve 18, so as to replenish oil for the hydraulic motor 10 and ensure that the motor is not sucked empty.

[0034] When the hydraulic motor 10 is reversed, the two solenoid valves need to be energized at the same time, and the first solenoid valve 2 and the second solenoid valve 3 are energized and then switch positions. The hydraulic oil of the main line 1 enters the control oil port 13 of the second two-way cartridge valve 5 from the P port of the second solenoid valve 3 through the B port, and the hydraulic oil of the main line 1 directly enters from the second inlet and outlet ports 15 of the second two-way cartridge valve 5. In this way, the oil pressure at the second inlet and outlet ports 15 of the second two-way cartridge valve 5 and the control oil port 13 of the second cartridge valve are both the oil pressure of the main line 1. Therefore, the oil pressures at the two places are equal, so the second two-way cartridge valve 5 cannot be opened, and no hydraulic oil enters the second hydraulic oil port 12.

[0035] The hydraulic oil of the main line 1 enters the first solenoid valve 2 and the first two-way cartridge valve 4. At this time, the hydraulic oil of the main line 1 directly enters the second oil inlet and outlet 15 of the first two-way cartridge valve 4, so that the pressure of the second oil inlet and outlet 15 of the first two-way cartridge valve 4 is the hydraulic oil pressure of the main line 1, and the control oil port 13 of the first two-way cartridge valve 4 is connected to the T port through the A port of the first solenoid valve 2. In this way, the pressure of the second oil inlet and outlet 15 of the first two-way cartridge valve 4 is greater than the pressure of the control oil port 13 of the first two-way cartridge valve 4, and the spring of the first two-way cartridge valve 41 will be compressed by the pressure of the second oil inlet and outlet 15, so that the oil in the spring cavity returns to the oil tank, the first two-way cartridge valve 4 opens, and the liquid in the main line 1 The pressurized oil enters from the second oil inlet and outlet port 15 of the first two-way cartridge valve 4, flows out from the first oil inlet and outlet port 14, and directly flows into the first oil port 11 of the hydraulic motor 10, so that the reversal of the hydraulic motor 10 can be achieved. Then the hydraulic oil flows out from the second oil port 12 of the hydraulic motor 10, enters the second oil inlet and outlet port 15 of the third two-way cartridge valve 6, so that the third two-way cartridge valve 6 can be opened, and the hydraulic oil flows out from the first oil inlet and outlet port 14 of the third two-way cartridge valve 6 to the third oil inlet and outlet port 16 of the first three-way cartridge valve 7, and then flows from the second oil inlet and outlet port 15 of the first three-way cartridge valve 7 to the first oil port 11 of the hydraulic motor 10, so as to replenish oil for the hydraulic motor 10 and ensure that the motor is not sucked empty.

[0036] When the ambient temperature is low and the fan is not needed for heat dissipation, the second solenoid valve 3 is energized, and the second solenoid valve 3 is switched after being energized. The hydraulic oil passes through the second solenoid valve 3 and the second two-way cartridge valve 5. At this time, the oil pressures of the second oil inlet and outlet ports 15 of the second two-way cartridge valve 5 and the spring chamber of the second cartridge valve are equal, so the second two-way cartridge valve 5 cannot be opened, the second oil port 12 of the hydraulic motor 10 cannot be filled with oil, and the motor does not rotate.

[0037] The first solenoid valve 2 is in a non-powered state. At this time, the oil pressure of the second oil inlet and outlet 15 of the first two-way cartridge valve 4 and the spring chamber of the first two-way cartridge valve 4 are equal, so the first two-way cartridge valve 4 cannot be opened, and the first oil port 11 of the hydraulic motor 10 cannot be filled with oil, and the motor does not rotate. In this way, since the hydraulic oil cannot enter the hydraulic motor 10, the hydraulic oil enters the second three-way cartridge valve 8 from the main pipeline 1, and flows out from the first inlet and outlet of the second three-way cartridge valve 8 and the control oil port 13 respectively. The hydraulic oil flowing out of the control oil port 13 enters the relief valve 9. When the pressure in the relief valve 9 reaches a certain value, the relief valve 9 opens, and the hydraulic oil returns to the oil tank through the return oil pipeline 17 to protect the working hydraulic pump.

Claims

1. A hydraulic motor control system, characterized in that it includes: A main pipeline, a first solenoid valve, a second solenoid valve, a first two-way cartridge valve, a second two-way cartridge valve, a third two-way cartridge valve, and a first three-way cartridge valve, wherein the P ports of the first solenoid valve and the second solenoid valve are connected to the main pipeline in parallel, the A port of the first solenoid valve is connected to the control oil port of the first two-way cartridge valve, the second oil inlet and outlet of the first two-way cartridge valve is connected to the main pipeline, the B port of the first solenoid valve is connected to the control oil port of the first three-way cartridge valve, the first oil inlet and outlet of the first two-way cartridge valve is connected to the first oil port of the hydraulic motor, and the second oil inlet and outlet of the first three-way cartridge valve is connected to the first oil port of the hydraulic motor; Therefore, port A of the second solenoid valve is connected to the control oil port of the third two-way cartridge valve, port B of the second solenoid valve is connected to the control oil port of the second two-way cartridge valve, the second inlet and outlet oil ports of the second two-way cartridge valve are connected to the main pipeline, the first inlet and outlet oil ports of the second two-way cartridge valve are connected to the second oil port of the motor, the second inlet and outlet oil ports of the third two-way cartridge valve are connected to the second oil port of the hydraulic motor, and the first inlet and outlet oil ports of the third two-way cartridge valve are connected to the third inlet and outlet oil ports of the first three-way cartridge valve.

2. A hydraulic motor control system as claimed in claim 1, characterized in that: It also includes an oil return pipeline, on which an overflow valve and a second three-way cartridge valve are arranged, the first oil inlet and outlet of the first three-way cartridge valve are connected to the third oil inlet and outlet of the second three-way cartridge valve, the control oil port of the second three-way cartridge valve is connected to the overflow valve, the oil outlet of the overflow valve is connected to the oil return pipeline, the first oil inlet and outlet of the second three-way cartridge valve is connected to the oil return pipeline, and the second oil inlet and outlet of the second three-way cartridge valve is connected to the main pipeline, so that the hydraulic oil pressure in the main pipeline can be shared by the second three-way cartridge valve to prevent the excessive pressure of the hydraulic oil in the main pipeline from affecting the hydraulic motor.

3. A hydraulic motor control system as claimed in claim 1, characterized in that: A first one-way valve and a second one-way valve are also provided. The first one-way valve is located between the second oil inlet and outlet and the first oil inlet and outlet of the third two-way cartridge valve, and the second one-way valve is located between the second oil inlet and outlet and the first oil inlet and outlet of the first three-way cartridge valve.

4. A hydraulic motor control system as claimed in claim 1, characterized in that: The main pipe is also provided with a pressure measuring port, which is used to connect a measuring instrument to monitor the pressure of the main pipe.

5. A hydraulic motor control system as claimed in claim 1, characterized in that: The first solenoid valve and the second solenoid valve are two-position four-way solenoid valves, the P port of the first solenoid valve is the oil inlet port, the T port is the oil return port, the oil return port is connected to the oil tank, and the A port and the B port are the working oil ports.

6. A hydraulic motor control system as claimed in claim 1, characterized in that: The hydraulic motor is also provided with an overflow port, and the overflow port is connected to the oil tank.

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