A hydraulic oil replenishment circuit system

Abstract

The present invention discloses a hydraulic oil replenishment circuit system and a hydraulic oil replenishment control method thereof, which relate to the technical field of oil replenishment circuits. The hydraulic oil replenishment circuit system includes: an oil tank, a delivery pump, a multi-way valve, an actuator, and a detection device. The oil tank, the delivery pump, the inlet of the multi-way valve, the detection device, the actuator, the oil return port of the multi-way valve, a check valve, and the actuator are connected in sequence, and further includes a logic valve block. The oil return port of the multi-way valve, the first inlet of the logic valve, the first outlet of the logic valve, and the oil tank are connected in sequence, and the oil return port, the second inlet of the logic valve, the second outlet of the logic valve, a control valve, and the oil tank are connected in sequence. The logic valve divides its interior into a first cavity and a second cavity by a valve core. The first inlet and the first outlet are located in the first cavity, the second inlet and the second outlet are located in the second cavity, and an elastic member for driving the valve core to reset is provided in the second cavity. This system can reduce the energy loss in the oil return pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of oil replenishing circuits, and more specifically, to a hydraulic oil replenishing circuit system. In addition, it also relates to a hydraulic oil replenishing control method applied to the above-mentioned hydraulic oil replenishing circuit system. Background Art

[0002] In the prior art, a check valve with back pressure is generally provided in the return oil circuit of a rotary drilling rig. The function of the check valve with back pressure is to provide oil replenishing pressure for the system. However, the disadvantage of this solution is that when the system is working normally, a certain back pressure will be generated in the return oil circuit, resulting in energy loss and heat increase, which does not meet the energy conservation and environmental protection requirements advocated by contemporary society.

[0003] In summary, how to reduce the energy loss of the return oil circuit while ensuring the safety of the hydraulic system is an urgent problem for those skilled in the art at present. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a hydraulic oil replenishing circuit system, which can automatically determine whether oil replenishment is required according to the working changes of the actuator, and then adjust the opening and closing operations of the logic valve block. When the actuator does not require oil replenishment, the oil in the return oil circuit will return to the fuel tank with extremely low back pressure, effectively reducing energy loss and the heating phenomenon of the hydraulic system; when the actuator requires oil replenishment, the logic valve can respond quickly to replenish oil to the actuator and ensure the smooth operation of the machine.

[0005] Another object of the present invention is to provide a hydraulic oil replenishing control method applied to the above-mentioned hydraulic oil replenishing circuit system.

[0006] In order to achieve the above objects, the present invention provides the following technical solutions:

[0007] A hydraulic oil replenishing circuit system, comprising: a fuel tank for storing oil, a delivery pump for delivering oil, a multi-way valve, an actuator, and a detection device for real-time feedback of the working condition of the actuator. The fuel tank, the delivery pump, the inlet port P of the multi-way valve, the detection device, the actuator, the return port T of the multi-way valve, a check valve, and the actuator are connected in sequence. It further includes a logic valve block provided with a logic valve, and the logic valve block is used to control the large-flow oil to flow back to the fuel tank or control the oil to be replenished to the actuator;

[0008] The return port T, the first inlet of the logic valve, the first outlet of the logic valve, and the fuel tank are connected in sequence. The return port T, the second inlet of the logic valve, the second outlet of the logic valve, a control valve, and the fuel tank are connected in sequence;

[0009] The logic valve divides its interior into a first cavity and a second cavity with a spool. The first inlet and the first outlet are located in the first cavity, the second inlet and the second outlet are located in the second cavity, and an elastic member for driving the spool to reset is provided in the second cavity.

[0010] Preferably, the actuator includes a motor.

[0011] Preferably, the control valve is a solenoid valve for performing on-off operations according to the working signal of the detection device.

[0012] Preferably, a first overflow valve is provided between the inlet and the outlet of the control valve, and the overflow pressure of the first overflow valve is adjustable to define the back pressure of the oil replenishing pipeline S.

[0013] Preferably, the logic valve block is a large-diameter valve block, and a throttle hole is provided in the logic valve block for defining the oil flow rate entering the control valve and the first overflow valve.

[0014] Preferably, the oil return port, the logic valve block, and the motor are sequentially connected through an oil replenishing pipeline, so that the large-flow oil returned from the multi-way valve to the fuel tank is replenished to the motor.

[0015] Preferably, a pressure sensor for detecting the pressure of the oil return pipeline is installed on the logic valve block.

[0016] Preferably, it further includes an accumulator for quickly replenishing oil to the motor and an oil source device connected to the accumulator, and the oil source device is used to provide oil for the accumulator.

[0017] Preferably, the inlet and the outlet of the oil source device are connected through a second overflow valve, the second overflow valve is used to control the output pressure of the oil source device, and a one-way valve is provided between the accumulator and the motor.

[0018] A hydraulic oil replenishing control method is applied to the hydraulic oil replenishing circuit system described in any one of the above, and includes:

[0019] Sequentially conveying oil to the multi-way valve and the actuator;

[0020] Detecting the operation process of the actuator to determine whether the actuator needs oil replenishment;

[0021] If the actuator does not need oil replenishment, the control valve is connected, so that the oil enters the first cavity of the logic valve from the multi-way valve and then returns to the fuel tank;

[0022] If the actuator needs oil replenishment, the control valve is disconnected to drive the oil to pass through the one-way valve from the multi-way valve and then reach the actuator.

[0023] When using the hydraulic oil replenishing circuit system provided by the present invention, the control device can control the operation of the delivery pump, so that the delivery pump transports the oil in the fuel tank to the multi-way valve. Then, the oil can be transported to the actuator through the multi-way valve to ensure the normal operation of the actuator. At the same time, the oil at the oil return port of the multi-way valve enters the first cavity and the second cavity of the logic valve. The flow rate of the oil entering the second cavity becomes very small. After the control valve receives the working signal of the actuator transmitted by the detection device, it will remain in the normally open position. This part of the small-flow oil returns to the fuel tank through the control valve. At this time, pressure cannot be established inside the second cavity. Due to the small set elastic force of the elastic member, the large-flow oil in the first cavity can easily push open the elastic member, so that the oil flows back to the fuel tank from the first cavity basically under zero pressure. At the same time, the oil at the oil return port of the multi-way valve can also flow to the actuator. However, since the working pressure of the actuator is very high at this time, the low-pressure oil return cannot enter the actuator. This method can greatly reduce the energy loss caused by back pressure in the oil return pipeline.

[0024] In addition, during the working processes such as the rotation of the power head of the rotary drilling rig, the lifting and lowering of the main hoist, and the traveling, due to poor geological conditions, large load inertia, and frequent braking, etc., it is often necessary to replenish the oil in the oil return circuit into the motor to ensure the normal operation of the machine's hydraulic system. When oil replenishment is required, the actuator shows an air suction phenomenon. After this signal is received by the detection device and transmitted to the control valve, the control valve is powered on and switched to the off position, so that the oil flowing out from the oil return port cannot flow back to the fuel tank through the control valve. A pressure difference is generated between the first cavity and the second cavity. Affected by the pressure in the second cavity and the area difference between the two cavities, at this time, the oil returning to the first cavity will generate a certain back pressure accordingly. This back pressure value can be used as the oil replenishment pressure of the oil replenishment circuit. The oil can directly pass through the one-way valve from the oil return port of the multi-way valve and reach the oil port of the actuator, thereby performing a large-flow oil replenishment operation on the actuator.

[0025] To sum up, the hydraulic oil replenishing circuit system provided by the present invention can automatically determine whether oil replenishment is required according to the working changes of the actuator, and then adjust the opening and closing operations of the control valve. When the actuator does not require oil replenishment, the oil in the oil return circuit will return to the fuel tank with extremely low back pressure, effectively reducing energy loss and the heating of the fuselage. When the motor requires oil replenishment, the logic valve can respond quickly to replenish oil to the motor and ensure the stable operation of the machine.

[0026] In addition, the present invention also provides a hydraulic oil replenishing control method applied to the above-mentioned hydraulic oil replenishing circuit system. Description of the Drawings

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a schematic structural diagram of the hydraulic oil replenishing circuit system provided by the present invention;

[0029] Figure 2 It is a schematic flow diagram of the hydraulic oil replenishing control method provided by the present invention.

[0030] Figure 1 and Figure 2 in:

[0031] 1 is an oil tank, 2 is a delivery pump, 3 is a multi-way valve, 4 is a motor, 5 is a check valve, 6 is a logic valve, 61 is a first inlet, 62 is a first outlet, 63 is a second inlet, 64 is a second outlet, 65 is a spool, 66 is an elastic member, 7 is a control valve, 8 is a first relief valve, 9 is an orifice, 10 is a pressure sensor, 11 is an accumulator, 12 is an oil source device, 13 is a radiator, 14 is a logic valve block, 15 is a detection device, 16 is a second relief valve, P is an oil inlet, T is an oil return port, and S is an oil replenishing pipeline. Specific Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] The core of the present invention is to provide a hydraulic oil replenishing circuit system, which can automatically determine whether oil replenishment is required according to the working changes of the motor, and then adjust the opening and closing operations of the control valve. When the motor does not require oil replenishment, the oil in the return oil circuit will return to the oil tank with extremely low back pressure, effectively reducing energy loss and the heating of the fuselage; when the motor requires oil replenishment, the logic valve can respond quickly to replenish oil to the motor and ensure the stable operation of the machine.

[0034] Another core of the present invention is to provide a hydraulic oil replenishing control method applied to the above-mentioned hydraulic oil replenishing circuit system.

[0035] Please refer to Figure 1 and Figure 2 , Figure 1 It is a schematic structural diagram of the hydraulic oil replenishing circuit system provided by the present invention;Figure 2 Schematic flow diagram of the hydraulic oil replenishment control method provided by the present invention.

[0036] This specific embodiment provides a hydraulic oil replenishment circuit system, including: a fuel tank 1 for storing oil, a delivery pump 2 for delivering oil, a multi-way valve 3, an actuator, and a detection device 15 for real-time feedback on the working condition of the actuator. The fuel tank 1, the delivery pump 2, the inlet port P of the multi-way valve 3, the detection device 15, the actuator, the return port T of the multi-way valve 3, a check valve 5, and the actuator are connected in sequence. It further includes a logic valve block 14 internally provided with a logic valve 6, and the logic valve block 14 is used to control the large-flow oil to flow back to the fuel tank 1 or to replenish the oil to the actuator.

[0037] The return port T, the first inlet 61 of the logic valve 6, the first outlet 62 of the logic valve 6, and the fuel tank 1 are connected in sequence. The return port T, the second inlet 63 of the logic valve 6, the second outlet 64 of the logic valve 6, a control valve 7, and the fuel tank 1 are connected in sequence.

[0038] The logic valve 6 divides its interior into a first cavity and a second cavity with a valve core 65. The first inlet 61 and the first outlet 62 are located in the first cavity, the second inlet 63 and the second outlet 64 are located in the second cavity, and an elastic member 66 for driving the valve core 65 to reset is provided in the second cavity.

[0039] It should be noted that the logic valve 6 can be set as a large-diameter valve, and the elastic force of the elastic member 66 is very small. After the control device receives the working condition of the actuator detected by the detection device 15, it will convert this information into an electrical signal and transmit it to the control valve 7 to change the on / off of the control valve 7, and then determine whether to start the oil replenishment operation.

[0040] When using the hydraulic oil replenishing circuit system provided by the present invention, the control device can control the operation of the delivery pump 2, so that the delivery pump 2 delivers the oil in the fuel tank 1 to the multi-way valve 3. Then, the oil can be delivered to the actuator through the multi-way valve 3. Among them, the actuator mainly includes the motor 4 to ensure the normal operation of the motor 4. At the same time, the oil at the oil return port T of the multi-way valve 3 enters the first cavity and the second cavity of the logic valve 6. The flow rate of the oil entering the second cavity will become very small. After the control valve 7 receives the working signal of the actuator transmitted by the detection device 15, it will remain in the normally open position. This part of the small-flow oil returns to the fuel tank 1 through the control valve 7. At this time, no pressure can be established in the second cavity. Due to the very small set elastic force of the elastic member 66, the large-flow oil in the first cavity can easily push open the elastic member 66, so that the oil flows back to the fuel tank 1 from the first cavity basically under zero pressure. At the same time, the oil at the oil return port T of the multi-way valve 3 can also flow to the actuator, but because the working pressure of the actuator is very high at this time, the low-pressure oil return cannot enter the actuator. This method can greatly reduce the energy loss caused by back pressure in the oil return pipeline.

[0041] In addition, during the working processes such as the rotation of the power head of the rotary drilling rig, the lifting of the main hoist, and the walking, due to poor geological conditions, large load inertia, and frequent braking, etc., it is often necessary to replenish the oil in the oil return circuit to the motor 4 to ensure the normal operation of the machine's hydraulic system. When oil replenishment is required, the actuator shows an air suction phenomenon. This signal is received by the detection device 15 and then transmitted to the control valve 7. The control valve 7 is energized and switched to the off position, so that the oil flowing out from the oil return port T cannot flow back to the fuel tank 1 through the control valve 7. A pressure difference is generated between the first cavity and the second cavity. Affected by the pressure in the second cavity and the area difference between the two cavities, at this time, the oil returning to the first cavity will generate a certain back pressure accordingly. This back pressure value can be used as the oil replenishing pressure of the oil replenishing circuit. The oil can directly pass through the check valve 5 from the oil return port T of the multi-way valve 3 and reach the oil port of the actuator, thereby performing a large-flow oil replenishing operation on the actuator.

[0042] In summary, the hydraulic oil replenishing circuit system provided by the present invention can automatically determine whether oil replenishment is required according to the working changes of the actuator, and then adjust the opening and closing operation of the control valve 7. When the actuator does not require oil replenishment, the oil in the oil return pipeline will return to the fuel tank 1 with extremely small back pressure, effectively reducing energy loss and the phenomenon of the fuselage heating up; when the motor requires oil replenishment, the logic valve can respond quickly to replenish oil to the motor and ensure the stable operation of the machine.

[0043] On the basis of the above embodiments, preferably, the actuator includes the motor 4. That is, the motor 4 is one of the actuators, and the actuator can also be set to other components according to actual situations.

[0044] Preferably, the control valve 7 is a solenoid valve configured to perform on-off operations according to the working signal of the detection device 15. That is, the solenoid valve can receive the working signal of the detection device 15. Herein, the detection device 15 is used to detect the working signal of the motor 4, convert the working signal into an electrical signal, and then transmit it into the logic valve block 14, thereby controlling the control valve 7 to perform connection or disconnection operations.

[0045] Preferably, a first relief valve 8 is provided between the inlet and outlet of the control valve 7, and the relief pressure of the first relief valve 8 is adjustable to define the backpressure magnitude of the oil replenishing pipeline S. It should be noted that the backpressure magnitude generated by the logic valve 6 is controlled by the first relief valve 8. That is, by adjusting the opening pressure of the first relief valve 8, the backpressure magnitude of the oil return pipeline can be controlled. Moreover, the first relief valve 8 can be replaced with a check valve 5 with backpressure, which also has the function of defining the backpressure of oil replenishment.

[0046] Preferably, a throttle orifice 9 is provided in the logic valve block 14, and the throttle orifice 9 is used to define the oil flow rate entering the control valve 7 and the first relief valve 8. Among them, the logic valve block 14 can be set as a large-diameter valve block, and a throttle orifice 9 can be provided between the oil return port T and the second inlet 63 to effectively control the oil flow rate entering the first relief valve 8 and the control valve 7.

[0047] It should be noted that affected by the working load of the motor 4, after receiving the electrical signal, the control valve 7 remains in a normally open state. The oil fluid passes through the oil return port T of the multi-way valve 3 and simultaneously enters the first cavity and the second cavity of the logic valve 6. Among them, the oil fluid entering the second cavity has a very small flow rate after passing through the throttle orifice 9. This part of the small-flow oil fluid returns to the fuel tank 1 through the control valve 7, so that no pressure can be established in the second cavity. At this time, the large-flow oil fluid in the first cavity can easily push open the elastic member 66, so that the oil fluid flows back to the fuel tank 1 from the first cavity basically under zero pressure. This method can greatly reduce the energy loss of the oil fluid in the oil return due to backpressure.

[0048] Based on the above embodiments, preferably, the oil return port T, the logic valve block 14, and the motor 4 are sequentially connected through the oil replenishing pipeline S to replenish the large-flow oil fluid returned from the multi-way valve 3 to the fuel tank 1 into the motor 4, and a check valve 5 can be provided on the oil replenishing pipeline S.

[0049] It should be noted that affected by the change of the working load of the motor 4, the solenoid valve may generate an air suction phenomenon and thus switch to the off state. When the oil fluid flowing out of the oil return port T of the multi-way valve 3 passes through the logic valve 6, the oil fluid in the second cavity returns to the fuel tank 1 through the first relief valve 8, so that pressure can be established in the second cavity. Affected by the area difference between the two cavities of the logic valve 6 and the pressure in the second cavity, a certain backpressure will be generated in the oil return pipeline. Part of the oil fluid with this backpressure can reach the oil inlet P of the motor 4 through the check valve 5 on the oil replenishing pipeline S to provide oil replenishment for the motor 4. AsFigure 1 As shown, Figure 1 The connecting lines between the various components are connecting pipelines, and the function of each one-way valve 5 is to replenish oil to the motor 4 in one direction.

[0050] Preferably, the logic valve block 14 is equipped with a pressure sensor 10 for detecting the pressure of the return oil pipeline, wherein a pressure measuring port can be set on the oil replenishment pipeline S, and the pressure measuring port is connected to the pressure sensor 10 to monitor the back pressure of the return oil pipeline to prevent the adverse effects caused by excessive back pressure. Generally, the larger the return oil flow rate, the larger the diameter of the logic valve 6, and the logic valve 6, the control valve 7, the first overflow valve 8 and the throttle hole 9 can be assembled in the logic valve block 14, and the hydraulic components are interconnected, the structure is beautiful, safe and reliable.

[0051] Preferably, it also includes an accumulator 11 for quickly replenishing oil to the motor 4 and an oil source device 12 connected to the accumulator 11, and the oil source device 12 is used to provide oil to the accumulator 11. For example, the oil source device 12 can be set as a hydraulic pump specifically for replenishing oil to the accumulator 11. Therefore, when the motor 4 needs to replenish oil, the small flow oil stored in the accumulator 11 by the oil source device 12 can be instantly replenished to the motor 4, providing a pause time for the process from the logic valve block 14 making a judgment to replenishing a large flow oil.

[0052] Preferably, the inlet and outlet of the oil source device 12 are connected via a second overflow valve 16, which is used to control the output pressure of the oil source device 12. A one-way valve 5 is provided between the accumulator 11 and the motor 4. When the motor 4 does not need to be replenished with oil, the oil source device 12 can provide oil to the accumulator 11 to ensure the flow rate when the motor 4 starts to replenish oil next time, so that the accumulator 11 can respond quickly and replenish oil to the motor 4 instantly to ensure the smooth operation of the machine. In addition, a one-way valve 5 is provided in the oil replenishment pipeline S to realize one-way oil replenishment control.

[0053] Preferably, a radiator 13 is provided between the first outlet 62 and the oil tank 1 to cool the oil in the oil return circuit before returning to the oil tank 1 to prevent the oil temperature from being too high.

[0054] In addition to the above-mentioned hydraulic oil replenishment circuit system, the present invention also provides a hydraulic oil replenishment control method applied to the above-mentioned hydraulic oil replenishment circuit system. The hydraulic oil replenishment control method includes:

[0055] The oil is sequentially delivered to the multi-way valve 3 and the actuator;

[0056] Detect the operation process of the actuator to determine whether the actuator needs oil replenishment;

[0057] If the actuator does not require oil replenishment, the control valve 7 is connected, so that the oil flows from the multi-way valve 3 into the first cavity of the logic valve 6 and then back to the oil tank 1;

[0058] If the actuator requires oil replenishment, the control valve 7 is disconnected to drive the oil from the multi-way valve 3 through the one-way valve 5 and then to the actuator.

[0059] It should be noted that, first, the delivery pump 2 can deliver the oil in the oil tank 1 to the multi-way valve 3, and then, the oil can be delivered to the actuator through the multi-way valve 3. Among them, the actuator mainly includes the motor 4 to ensure the normal operation of the motor 4. Then, the detection device 15 can detect the operation process of the actuator to judge whether the actuator needs oil replenishment and transmit the working signal of the actuator to the control valve 7.

[0060] When the actuator does not require oil replenishment, after the control valve 7 receives the working signal of the actuator transmitted by the detection device 15, it will remain in the normally open position to drive the oil into the first cavity and the second cavity of the logic valve from the multi-way valve. The flow rate of the oil entering the second cavity will become very small. This part of the small-flow oil returns to the oil tank 1 through the control valve 7. At this time, pressure cannot be established in the second cavity. Since the set elastic force of the elastic member 66 is very small, the large-flow oil in the first cavity can easily push open the elastic member 66, so that the oil flows back to the oil tank 1 from the first cavity basically under zero pressure. At the same time, the oil at the oil return port T of the multi-way valve 3 can also flow to the actuator, but since the working pressure of the actuator is very high at this time, the low-pressure oil return cannot enter the actuator. This method can greatly reduce the energy loss caused by the back pressure in the oil return pipeline.

[0061] When the actuator requires oil replenishment, the actuator shows a suction void phenomenon. After the control valve 7 receives the signal transmitted by the detection device 15, the control valve 7 is energized and switched to the disconnected position, so that the oil flowing out from the oil return port T cannot flow back to the oil tank 1 through the control valve 7. A pressure difference is generated between the first cavity and the second cavity. Affected by the pressure in the second cavity and the area difference between the two cavities, a certain back pressure will be generated in the oil returning from the first cavity. This back pressure value can be used as the oil replenishment pressure of the oil replenishment pipeline. The oil can directly pass through the one-way valve 5 from the oil return port T of the multi-way valve 3 to the oil port of the actuator, so as to perform a large-flow oil replenishment operation on the actuator.

[0062] It should be noted that the first outlet 62, the second outlet 64, the first inlet 61, the second inlet 63, the first overflow valve 8, and the second overflow valve 16 mentioned in this application document. Among them, the first and the second are only to distinguish the different positions and there is no order of precedence.

[0063] In addition, it should be noted that the orientation or positional relationship indicated by "in and out" and the like in this application is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description and facilitating understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0064] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. Any combination of all the embodiments provided by the present invention is within the protection scope of this invention, and will not be elaborated here.

[0065] The above has introduced in detail the hydraulic oil replenishment circuit system and its hydraulic oil replenishment control method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic oil replenishment circuit system, comprising: An oil tank (1) for storing oil, a delivery pump (2) for delivering oil, a multi-way valve (3), an actuator, and a detection device (15) for real-time feedback of the working condition of the actuator. The oil tank (1), the delivery pump (2), the inlet port P of the multi-way valve (3), the detection device (15), the actuator, the return port T of the multi-way valve (3), a check valve (5), and the actuator are connected in sequence. It is characterized in that it further includes a logic valve block (14) internally provided with a logic valve (6), and the logic valve block (14) is used to control the large-flow oil to flow back to the oil tank (1) or control the oil to be replenished to the actuator; The return port T, the first inlet (61) of the logic valve (6), the first outlet (62) of the logic valve (6), and the oil tank (1) are connected in sequence. The return port T, the second inlet (63) of the logic valve (6), the second outlet (64) of the logic valve (6), a control valve (7), and the oil tank (1) are connected in sequence; The logic valve (6) divides its interior into a first cavity and a second cavity by a valve core (65). The first inlet (61) and the first outlet (62) are located in the first cavity. The second inlet (63) and the second outlet (64) are located in the second cavity. An elastic member (66) for driving the valve core (65) to reset is provided in the second cavity; A first overflow valve (8) is provided between the inlet and the outlet of the control valve (7). The overflow pressure of the first overflow valve (8) is adjustable to limit the back pressure of the oil replenishment pipeline S. A throttle orifice (9) is provided in the logic valve block (14), and the throttle orifice (9) is used to limit the oil flow rate entering the control valve (7) and the first overflow valve (8).

2. The hydraulic oil replenishment circuit system according to claim 1, wherein The actuator includes a motor (4).

3. The hydraulic oil replenishing circuit system according to claim 2, wherein The control valve (7) is a solenoid valve for performing on-off operation according to the working signal of the detection device (15).

4. The hydraulic oil replenishment circuit system according to claim 2 or 3, characterized in that The return port T, the logic valve block (14), and the motor (4) are connected in sequence through an oil replenishment pipeline S, so that the large-flow oil returning from the multi-way valve (3) to the oil tank (1) is replenished into the motor (4).

5. The hydraulic oil replenishing circuit system according to any one of claims 1 to 3, characterized in that A pressure sensor (10) for detecting the pressure of the return pipeline is installed on the logic valve block (14).

6. The hydraulic oil replenishing circuit system according to claim 2 or 3, characterized in that, It further includes an accumulator (11) for quickly replenishing oil to the motor (4) and an oil source device (12) connected to the accumulator (11). The oil source device (12) is used to provide oil for the accumulator (11).

7. The hydraulic oil replenishment circuit system according to claim 6, wherein The inlet and the outlet of the oil source device (12) are connected through a second overflow valve (16). The second overflow valve (16) is used to control the output pressure of the oil source device (12). A check valve (5) is provided between the accumulator (11) and the motor (4).

8. A hydraulic oil replenishment control method is applied to the hydraulic oil replenishment circuit system described in any one of the above claims 1-7, and is characterized in that, Including: Sequentially delivering oil to the multi-way valve (3) and the actuator; Detecting the operation process of the actuator to judge whether the actuator needs oil replenishment; If the actuator does not require oil replenishment, the control valve (7) is connected so that the hydraulic oil enters the first cavity of the logic valve (6) from the multi-way valve (3) and then returns to the fuel tank (1); If the actuator requires oil replenishment, the control valve (7) is disconnected to drive the hydraulic oil from the multi-way valve (3) through the one-way valve (5) and then to the actuator.

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