A closed monitoring and control system for hydraulic motors

Abstract

The present application discloses a closed-loop monitoring and control system for a hydraulic motor, comprising a hydraulic motor, a main pump, an oil tank, a control circuit, and a monitoring module; the main pump is adapted to pump the oil in the oil tank to the hydraulic motor, so that the hydraulic motor converts hydraulic energy into mechanical energy for output; the monitoring module is adapted to detect the working state of the hydraulic motor, and the control circuit is adapted to control the displacement of the main pump according to the detection result of the monitoring module. The beneficial effects of the present application are as follows: by detecting the working state of the hydraulic motor and controlling the working state of the main pump according to the detection result, when an abnormality occurs in the hydraulic motor, the output speed of the hydraulic motor can be timely reduced or the hydraulic motor can be directly shut down, thereby effectively ensuring the safe operation of the hydraulic motor.

Description

Technical Field

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

[0002] Hydraulic transmission systems often rely on hydraulic motors as the driving force for transmission. Because hydraulic transmission systems typically operate in harsh environments, a system anomaly can damage the hydraulic motor. This can be particularly costly for expensive, high-torque hydraulic motors, resulting in significant financial losses.

[0003] Due to the hydraulic system's operating environment, existing hydraulic systems have relatively rudimentary monitoring measures for hydraulic motors, typically simply monitoring parameters such as the motor's temperature and speed. However, they are unable to monitor internal wear and tear, and when abnormal motor temperatures are detected, temperature control is impossible and the system can only generate an alarm. Summary of the Invention

[0004] One of the objectives of the present application is to provide a hydraulic motor closed monitoring and control system that can solve at least one of the defects in the above-mentioned background technology.

[0005] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a closed monitoring and control system for a hydraulic motor, comprising a hydraulic motor, a main pump, an oil tank, a control circuit and a monitoring module; the main pump is suitable for pumping the oil in the oil tank to the hydraulic motor; the monitoring module is suitable for detecting the working status of the hydraulic motor, and the control circuit is suitable for controlling the displacement of the main pump according to the detection results of the monitoring module, thereby controlling the output flow of the hydraulic motor.

[0006] Preferably, the hydraulic motor closed monitoring and control system further comprises a cooling circuit, and the cooling circuit is adapted to output flushing oil to the hydraulic motor for cooling according to the temperature detection result of the monitoring module.

[0007] Preferably, the monitoring module includes a temperature sensor, and the cooling circuit includes an auxiliary pump and a flow control valve; the temperature sensor is suitable for detecting the working temperature of the hydraulic motor; the driving end of the auxiliary pump is connected to the main pump in a transmission manner, the input end of the auxiliary pump is connected to the oil tank, and the output end of the auxiliary pump extends to the position of the hydraulic motor through a pipeline; when the working temperature of the hydraulic motor is higher than the set temperature threshold, the flow control valve is suitable for controlling the displacement of the auxiliary pump to increase.

[0008] Preferably, the temperature threshold includes a normal operating threshold and a limit temperature threshold, and the limit temperature threshold is greater than the normal operating threshold; when the operating temperature of the hydraulic motor is lower than the normal operating threshold, the flow control valve is suitable for controlling the displacement of the auxiliary pump to decrease; when the operating temperature of the hydraulic motor is higher than the normal operating threshold but lower than the limit temperature threshold, the flow control valve is suitable for controlling the displacement of the auxiliary pump to increase; when the operating temperature of the hydraulic motor is higher than the limit temperature threshold, the control circuit is suitable for controlling the main pump to shut down.

[0009] Preferably, when the operating temperature of the hydraulic motor is lower than the normal operating threshold, the control circuit is suitable for controlling the displacement of the main pump to increase; when the operating temperature of the hydraulic motor is higher than the normal operating threshold but lower than the limit temperature threshold, the control circuit is suitable for controlling the displacement of the main pump to decrease.

[0010] Preferably, the flushing oil delivered to the hydraulic motor by the auxiliary pump flows back to the oil tank through the return branch; the monitoring module is installed in the return branch, and then the temperature of the return flushing oil is detected by the temperature sensor to determine the working temperature of the hydraulic motor.

[0011] Preferably, the monitoring module also includes a metal particle sensor, which is suitable for detecting the content of metal particles in the reflux flushing oil; if the detected metal particle content is greater than a set threshold, the control loop is suitable for controlling the output flow of the main pump to be reduced to a minimum or 0.

[0012] Preferably, the monitoring module also includes a first flow detection device, and the cooling circuit also includes a second flow detection device; the first flow detection device is used to detect the first flow of the flushing oil return, and the second flow detection device is used to detect the second flow output by the auxiliary pump; if the difference between the first flow and the second flow is greater than a set threshold, it is judged that the hydraulic motor has a leak, and then the displacement of the main pump is reduced to 0 through the control circuit and shut down.

[0013] Preferably, the control circuit includes a regulating valve; the regulating valve is suitable for adjusting its own opening to control and regulate the displacement of the main pump.

[0014] Preferably, the main pump adopts a variable pump, and the control circuit also includes a variable piston cylinder. The output end of the variable piston cylinder is cooperatively connected to the main pump, and the regulating valve is connected between the output end of the main pump and the variable piston cylinder; the regulating valve is suitable for adjusting the stroke of the variable piston cylinder to control the displacement of the main pump.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] By detecting the working status of the hydraulic motor and controlling the working status of the main pump according to the detection results, when the hydraulic motor has an abnormality, the output speed of the hydraulic motor can be reduced in time or directly shut down, thereby effectively ensuring the safe operation of the hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall architecture of this application.

[0018] Figure 2 This is a schematic diagram of the overall hydraulic structure of this application.

[0019] In the figure: hydraulic motor 100, main pump 200, oil tank 300, monitoring module 400, first flow detection device 401, metal particle sensor 402, temperature sensor 403, control circuit 500, regulating valve 501, first variable piston cylinder 502, cooling circuit 600, auxiliary pump 601, flow control valve 602, second variable piston cylinder 603, third variable piston cylinder 604, second flow detection device 605. DETAILED DESCRIPTION

[0020] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, in the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0021] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0025] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to such process, method, product or apparatus.

[0026] One of the preferred embodiments of this application is as follows: Figure 1 As shown, a closed monitoring and control system for a hydraulic motor includes a hydraulic motor 100, a main pump 200, an oil tank 300, a control circuit 500, and a monitoring module 400. The oil tank 300 is used to hold oil, and the main pump 200 can pump the oil in the oil tank 300 to the hydraulic motor 100, and then the hydraulic motor 100 can convert hydraulic energy into mechanical energy for output. The purpose of this embodiment is to monitor the working status of the hydraulic motor 100; that is, the monitoring module 400 can detect the working status of the hydraulic motor 100, and the control circuit 500 can control the displacement of the main pump 200 according to the detection result of the monitoring module 400, and then control the output speed of the hydraulic motor 100.

[0027] Specifically, when the monitoring module 400 detects that the hydraulic motor 100 has an abnormal operation, the displacement of the main pump 200 can be controlled to be reduced through the control circuit 500, and the output speed of the hydraulic motor 100 can be reduced synchronously. In extreme cases, the main pump 200 can be shut down, that is, the displacement is 0; at this time, the hydraulic motor 100 will also stop working, thereby effectively suppressing the abnormal situation of the hydraulic motor 100 to ensure the safe operation of the hydraulic motor 100 and avoid the spread of faults.

[0028] It is understood that abnormal conditions that may occur during operation of the hydraulic motor 100 include abnormal temperature, abnormal wear, and leakage. For abnormal wear and leakage, the hydraulic motor 100 must be shut down for repair. For abnormal temperature, a decision must be made based on the specific situation. If the temperature is only slightly above the normal operating temperature, additional cooling of the hydraulic motor 100 is sufficient. If the temperature is excessively high, the hydraulic motor 100 must be shut down to prevent burnout. For ease of understanding, the following describes in detail the control process for the hydraulic motor 100 in response to different abnormal conditions.

[0029] 1. Regarding the abnormal temperature state of the hydraulic motor 100.

[0030] In this embodiment, Figure 1 and Figure 2 As shown, the hydraulic motor closed monitoring and control system of the present application further includes a cooling circuit 600 , which can output flushing oil to the hydraulic motor 100 for cooling according to the temperature detection result of the monitoring module 400 .

[0031] It is understood that while the hydraulic motor 100 is operating, an independent cooling circuit 600 can be provided to output flushing oil to the hydraulic motor 100. The flushing oil then absorbs heat from the hydraulic motor 100 through heat transfer, and the return of the flushing oil dissipates heat from the hydraulic motor 100. When the hydraulic motor 100 is operating normally, or when the operating temperature of the hydraulic motor 100 is low, the cooling circuit 600 can be opened normally or remain closed. When the operating temperature of the hydraulic motor 100 exceeds a set threshold, the cooling circuit 600 can be opened or the output of the flushing oil can be increased, thereby accelerating heat dissipation from the hydraulic motor 100.

[0032] It should be understood that the flushing oil may be sprayed directly onto the hydraulic motor 100 to achieve cooling, or the hydraulic motor 100 may be immersed in the flushing oil for cooling.

[0033] Specifically, such as Figure 2As shown, the monitoring module 400 includes a temperature sensor 403, and the cooling circuit 600 includes an auxiliary pump 601 and a flow control valve 602. The temperature sensor 403 can detect the operating temperature of the hydraulic motor 100. The driving end of the auxiliary pump 601 is connected to the main pump 200, so that when the main pump 200 is driven by the motor, the auxiliary pump 601 can rotate synchronously with the main pump 200. The input end of the auxiliary pump 601 is connected to the oil tank 300, and the output end of the auxiliary pump 601 extends to the location of the hydraulic motor 100 through a pipeline. When the auxiliary pump 601 is operating, the oil in the oil tank 300 is pumped to the location of the hydraulic motor 100 as flushing oil. When the operating temperature of the hydraulic motor 100 exceeds a set temperature threshold, the flow control valve 602 can control the displacement of the auxiliary pump 601 to increase, thereby increasing the amount of flushing oil used to cool the hydraulic motor 100 and improving the heat dissipation efficiency of the hydraulic motor 100.

[0034] It should be noted that the specific structures and working principles of the temperature sensor 403, the auxiliary pump 601 and the flow control valve 602 are well-known technologies to those skilled in the art, so they will not be elaborated on in detail here. There are many ways for the flow control valve 602 to control the displacement of the auxiliary pump 601, which are specifically related to the type of the auxiliary pump 601. For example, the flow control valve 602 can be installed at the output end of the auxiliary pump 601, and the displacement of the auxiliary pump 601 can be controlled by the opening of the flow control valve 602. For example Figure 2 As shown, the auxiliary pump 601 is a variable pump, and the displacement of the auxiliary pump 601 is controlled by the second variable piston cylinder 603 and the third variable piston cylinder 604; wherein, the third variable piston cylinder 604 is an elastic cylinder, the second variable piston cylinder 603 is a hydraulic cylinder, and the second variable piston cylinder 603 and the third variable piston cylinder 604 are respectively driven to connect to the two ends of the displacement control rod of the auxiliary pump 601; the flow control valve 602 is connected to the second variable piston cylinder 603, and then the flow control valve 602 supplies oil or returns oil to the rodless chamber of the second variable piston cylinder 603 through the hydraulic circuit to drive the displacement control rod of the auxiliary pump 601 to rotate to realize displacement control.

[0035] It is understandable that the temperature range in which the hydraulic motor 100 can operate is limited. If this range is exceeded, the hydraulic motor 100 may burn out, and the hydraulic motor 100 needs to be shut down. Then the temperature threshold can be set to include a normal operating threshold and an extreme temperature threshold, and the extreme temperature threshold is greater than the normal operating threshold. When the operating temperature of the hydraulic motor 100 is lower than the normal operating threshold, the flow control valve 602 can control the displacement of the auxiliary pump 601 to decrease. When the operating temperature of the hydraulic motor 100 is higher than the normal operating threshold but lower than the extreme temperature threshold, the flow control valve 602 can control the displacement of the auxiliary pump 601 to increase. When the operating temperature of the hydraulic motor 100 is higher than the extreme temperature threshold, the control circuit 500 can control the main pump 200 to shut down, and the hydraulic motor 100 will also shut down.

[0036] It should be noted that the auxiliary pump 601 and the main pump 200 are synchronously driven by a motor, so the output power W of the motor needs to meet the displacement requirements of the auxiliary pump 601 and the main pump 200 at the same time.

[0037] Those skilled in the art will appreciate that when the hydraulic motor 100 is operating, its operating temperature is primarily generated by the output shaft's rotational speed. That is, the faster the output speed of the hydraulic motor 100, the higher its operating temperature. Therefore, in this embodiment, when the operating temperature of the hydraulic motor 100 is below a normal operating threshold, the control circuit 500 can control the displacement of the main pump 200 to increase. When the operating temperature of the hydraulic motor 100 is above the normal operating threshold but below a limit temperature threshold, the control circuit 500 can control the displacement of the main pump 200 to decrease.

[0038] It is understood that when the operating temperature of the hydraulic motor 100 is lower than the normal operating threshold, the cooling efficiency of the cooling circuit 600 through the flushing oil on the hydraulic motor 100 is greater than the heat generation efficiency of the hydraulic motor 100 during operation. In this case, the hydraulic motor 100 can appropriately increase its output speed, that is, the main pump 200 can appropriately increase its displacement, until the heat generation efficiency of the hydraulic motor 100 and the cooling efficiency of the cooling circuit 600 are balanced. When the heat generation efficiency of the hydraulic motor 100 is greater than the cooling efficiency of the cooling circuit 500, the displacement of the auxiliary pump 601 in the cooling circuit 600 can be increased, thereby increasing the amount of flushing oil to improve the cooling efficiency; if the cooling circuit 600 is already operating at the maximum cooling efficiency, that is, when the auxiliary pump 601 reaches the maximum displacement, the cooling efficiency of the cooling circuit 600 is still insufficient to cool the hydraulic motor 100. At this time, the hydraulic motor 100 can reduce the output speed by reducing the displacement of the main pump 200, thereby reducing the cooling efficiency of the hydraulic motor 100 until the cooling efficiency of the cooling circuit 600 is greater than or equal to the heat generation efficiency of the hydraulic motor 100. Of course, when the operating temperature of the hydraulic motor 100 exceeds the normal operating threshold, the displacement of the auxiliary pump 601 can be increased while the displacement of the main pump 200 is reduced to further accelerate the above-mentioned heat dissipation balancing process.

[0039] It should be noted that there are various specific ways for the temperature sensor 403 to detect the operating temperature of the hydraulic motor 100. Alternatively, the temperature sensor 403 can directly detect the temperature of the hydraulic motor 100. However, since the flushing oil needs to be sprayed or soaked on the hydraulic motor 100, the installation of the temperature sensor 403 may be affected, resulting in inaccurate detection results from the temperature sensor 403. Therefore, in this embodiment, the operating temperature of the hydraulic motor 100 can be determined by measuring the temperature of the flushing oil that has returned after absorbing heat.

[0040] Specifically, such as Figure 2 As shown, the flushing oil delivered to the hydraulic motor 100 by the auxiliary pump 601 flows back to the oil tank 300 through the return branch. The monitoring module 400 is installed in the return branch, and then detects the temperature of the return flushing oil through the temperature sensor 403 to determine the operating temperature of the hydraulic motor 100.

[0041] It can be understood that the temperature of the flushing oil returning during normal operation of the hydraulic motor 100 can be stored as a normal operating threshold. Then, when the flushing oil temperature detected by the temperature sensor 403 exceeds the normal operating threshold, it means that the operating temperature of the hydraulic motor 100 is relatively high at this time, and it is necessary to increase the cooling efficiency of the cooling circuit 600 and / or reduce the output speed of the hydraulic motor 100.

[0042] 2. Regarding the abnormal wear state of the hydraulic motor 100.

[0043] In this embodiment, Figure 2 As shown, monitoring module 400 also includes a metal particle sensor 402, which is also located in the return branch and can detect the metal particle content in the return flushing oil. If the detected metal particle content exceeds a set threshold, control circuit 500 can control the output flow of main pump 200 to reduce to a minimum or zero.

[0044] It is understood that wear of the hydraulic motor 100 typically occurs at the output shaft. Specifically, the output shaft may bend under load, causing the output shaft to vibrate during rotation, which in turn increases wear of the hydraulic motor 100. This increased wear also increases the operating temperature of the hydraulic motor 100 and reduces transmission efficiency. The output shaft is typically made of metal, and during rotation, it rubs against the housing, producing metal particles. These metal particles are then recirculated with the flushing oil. Therefore, the wear of the hydraulic motor 100 can be assessed by detecting the metal particle content in the recirculating flushing oil.

[0045] It should be understood that the specific structure and operating principle of the metal particle sensor 402 are well known to those skilled in the art and will not be elaborated upon in detail herein. In the entire hydraulic drive system, the output flow of the main pump 200 may not only be used to drive the hydraulic motor 100, but may also be used for other drives; therefore, when wear is detected on the hydraulic motor 100, the main pump 200 may reduce the output flow to a minimum, thereby shutting down the hydraulic motor 100. Of course, if the main pump 200 is only used to drive the hydraulic motor 100 for transmission, then when wear is detected on the hydraulic motor 100, the output flow of the main pump 200 may be directly reduced to zero.

[0046] 3. Leakage of the hydraulic motor 100 occurs.

[0047] In this embodiment, Figure 2 As shown, the monitoring module 400 also includes a first flow detection device 401, and the cooling circuit 600 also includes a second flow detection device 605. The first flow detection device 401 is installed in the return branch to detect a first flow rate of the return flushing oil. The second flow detection device 605 is installed at the output of the auxiliary pump 601 to detect a second flow rate output by the auxiliary pump 601. If the difference between the first flow rate and the second flow rate exceeds a set threshold, the hydraulic motor 100 is judged to have a leak, and the control circuit 500 is used to reduce the displacement of the main pump 200 to zero, causing the main pump 200 to shut down.

[0048] It is understandable that the flow rate of the flushing oil delivered to the hydraulic motor 100 by the cooling return 600 through the auxiliary pump 601 is theoretically equal to the return flow rate of the flushing oil; considering the loss of the oil circuit, the difference between the flushing oil flow rate output by the auxiliary pump 601 and the return flow rate of the flushing oil after cooling can be regarded as a constant, which is the set threshold. If the hydraulic motor 100 leaks, the oil delivered to the hydraulic motor 100 by the main pump 200 will flow back along with the flushing oil, which will cause the return flow rate of the flushing oil to increase, that is, the difference between the flushing oil flow rate output by the auxiliary pump 601 and the return flow rate of the flushing oil after cooling exceeds the set threshold. At this time, it can be determined that the hydraulic motor 100 has leaked. For leaks in the hydraulic motor 100, it is necessary to shut down the motor for maintenance.

[0049] In the embodiment of the present application, there are multiple specific structures of the control circuit 500 that can realize the displacement control of the main pump 200; for the sake of easy understanding, one of the structures will be described in detail below. Figure 2 As described above, the control circuit 500 includes a regulating valve 501 ; the regulating valve 501 can adjust its opening to control and regulate the displacement of the main pump 200 .

[0050] It is understood that there are various specific implementations for regulating the displacement of the main pump 200 by the regulating valve 501 through its own opening. For example, the regulating valve 501 can throttle the output flow of the main pump 200. Alternatively, if the main pump 200 is a variable displacement pump, displacement control can be achieved by driving and controlling the variable displacement control lever of the main pump 200. For ease of understanding, the following detailed description will use the example of a variable displacement pump as an example.

[0051] Specifically, such as Figure 2 As shown, the control circuit 500 also includes a variable piston cylinder, namely a first variable piston cylinder 502. The output end of the first variable piston cylinder 502 is driven and connected to the variable control rod of the main pump 200, and the regulating valve 501 is connected between the output end of the main pump 200 and the first variable piston cylinder 502; the regulating valve 501 can adjust its own opening to control the amount of oil entering the first variable piston cylinder 502, and then realize the displacement control of the main pump 200 by controlling the stroke of the first variable piston cylinder 502.

[0052] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A closed monitoring and control system for a hydraulic motor, characterized in that: The system comprises a hydraulic motor, a main pump, an oil tank, a control circuit and a monitoring module; the main pump is adapted to pump the oil in the oil tank to the hydraulic motor, so that the hydraulic motor converts hydraulic energy into mechanical energy for output; the monitoring module is adapted to detect the working state of the hydraulic motor, and the control circuit is adapted to control the displacement of the main pump according to the detection result of the monitoring module; The hydraulic motor closed monitoring and control system further comprises a cooling circuit, wherein the cooling circuit is adapted to output flushing oil to the hydraulic motor for cooling according to the temperature detection result of the monitoring module; The monitoring module includes a temperature sensor, and the cooling circuit includes an auxiliary pump and a flow control valve; the temperature sensor is suitable for detecting the operating temperature of the hydraulic motor; the driving end of the auxiliary pump is connected to the main pump in a transmission manner, the input end of the auxiliary pump is connected to the oil tank, and the output end of the auxiliary pump extends to the position of the hydraulic motor through a pipeline; when the operating temperature of the hydraulic motor is higher than a set temperature threshold, the flow control valve is suitable for controlling the displacement of the auxiliary pump to increase; The flushing oil delivered to the hydraulic motor by the auxiliary pump flows back to the oil tank through the return branch; The monitoring module is installed in the return branch, and then detects the temperature of the return flushing oil through the temperature sensor to determine the working temperature of the hydraulic motor; The monitoring module further includes a metal particle sensor adapted to detect the content of metal particles in the refluxed flushing oil; if the detected metal particle content is greater than a set threshold, the control circuit is adapted to control the output flow of the main pump to be reduced to a minimum or to 0; The monitoring module further includes a first flow detection device, and the cooling circuit further includes a second flow detection device; the first flow detection device is used to detect a first flow rate of the flushing oil return oil, and the second flow detection device is used to detect a second flow rate output by the auxiliary pump; If the difference between the first flow rate and the second flow rate is greater than a set threshold, it is determined that the hydraulic motor has a leak, and then the displacement of the main pump is reduced to 0 through the control circuit and the main pump is shut down.

2. The closed monitoring and control system for a hydraulic motor according to claim 1, characterized in that: The temperature threshold includes a normal operating threshold and a limit temperature threshold, and the limit temperature threshold is greater than the normal operating threshold; When the operating temperature of the hydraulic motor is lower than the normal operating threshold, the flow control valve is adapted to control the displacement of the auxiliary pump to decrease; When the operating temperature of the hydraulic motor is higher than the normal operating threshold but lower than the limit temperature threshold, the flow control valve is adapted to control the displacement of the auxiliary pump to increase; When the operating temperature of the hydraulic motor is higher than the limit temperature threshold, the control circuit is adapted to control the main pump to shut down.

3. The closed monitoring and control system for a hydraulic motor according to claim 2, characterized in that: When the operating temperature of the hydraulic motor is lower than the normal operating threshold, the control circuit is adapted to control the displacement of the main pump to increase; When the operating temperature of the hydraulic motor is higher than the normal operating threshold but lower than the limit temperature threshold, the control circuit is adapted to control the displacement of the main pump to decrease.

4. The closed monitoring and control system for a hydraulic motor according to any one of claims 1 to 3, characterized in that: The control circuit includes a regulating valve; the regulating valve is suitable for adjusting its own opening to control and regulate the displacement of the main pump.

5. The closed monitoring and control system for a hydraulic motor according to claim 4, characterized in that: The main pump adopts a variable pump, and the control circuit also includes a variable piston cylinder. The output end of the variable piston cylinder is cooperatively connected to the main pump, and the regulating valve is connected between the output end of the main pump and the variable piston cylinder; the regulating valve is suitable for adjusting the stroke of the variable piston cylinder to control the displacement of the main pump.

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