Hydraulic motor monitoring control system

Abstract

The utility model discloses a hydraulic motor monitoring control system which comprises a hydraulic motor, a main pump, a control loop, a cooling loop and a monitoring module. The main pump is suitable for pumping oil in the oil tank to the hydraulic motor; the cooling loop is suitable for conveying flushing oil to the hydraulic motor for cooling; the control loop is suitable for controlling the displacement of the main pump; and the monitoring module is suitable for detecting the working temperature of the hydraulic motor, so that when the working temperature of the hydraulic motor exceeds a set temperature threshold value, the control loop controls the displacement of the main pump to be reduced and / or the cooling loop to increase the output quantity of the flushing oil. The control method has the beneficial effects that the working state of the hydraulic motor is detected, and the working state of the main pump is controlled according to the detection result, so that when the hydraulic motor is abnormal, the output rotating speed of the hydraulic motor can be reduced in time or the hydraulic motor is directly shut down, and the operation safety of the hydraulic motor can be effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic technology, in particular to a hydraulic motor monitoring control system. BACKGROUND

[0002] The hydraulic transmission system often needs a hydraulic motor as a driving source of the whole system to realize transmission when working. Since the working environment of the hydraulic transmission system is generally harsh, the hydraulic motor may be damaged when the system is abnormal, especially for valuable large torque hydraulic motors, which will cause great economic loss.

[0003] Based on the working environment of the hydraulic system, the existing hydraulic system is relatively simple in monitoring the hydraulic motor, which generally only monitors the temperature and rotating speed of the hydraulic motor. However, it cannot monitor the internal wear of the hydraulic motor, and cannot realize temperature regulation when the temperature of the hydraulic motor is abnormal, but only can send an alarm. CONTENT OF THE INVENTION

[0004] One of the purposes of the present application is to provide a hydraulic motor monitoring control system which can solve at least one defect in the background technology.

[0005] To achieve the above at least one purpose, the technical solution adopted by the present application is: a hydraulic motor monitoring control system, comprising a hydraulic motor, a main pump, a control circuit, a cooling circuit and a monitoring module; the main pump is adapted to pump the oil in the oil tank to the hydraulic motor; the cooling circuit is adapted to deliver flushing oil to the hydraulic motor for cooling; the control circuit is adapted to control the displacement of the main pump; the monitoring module is adapted to detect the working temperature of the hydraulic motor, so that when the working temperature of the hydraulic motor exceeds the set temperature threshold, the control circuit controls the displacement of the main pump to decrease and / or the cooling circuit increases the output of flushing oil.

[0006] Preferably, the monitoring module comprises a temperature sensor, and the cooling circuit comprises a secondary pump and a flow control valve; the temperature sensor is adapted to detect the working temperature of the hydraulic motor; the driving end of the secondary pump is in driving connection with the main pump, the input end of the secondary pump is connected with the oil tank, and the output end of the secondary pump extends to the position of the hydraulic motor through a pipeline; the flow control valve is adapted to control the displacement of the secondary pump.

[0007] Preferably, the temperature threshold comprises a normal working threshold and a limit temperature threshold, the limit temperature threshold being greater than the normal working threshold; the flow control valve is adapted to control the displacement of the auxiliary pump to decrease when the working temperature of the hydraulic motor is lower than the normal working threshold; the flow control valve is adapted to control the displacement of the auxiliary pump to increase when the working temperature of the hydraulic motor is higher than the normal working threshold but lower than the limit temperature threshold; the control circuit is adapted to control the main pump to stop when the working temperature of the hydraulic motor is higher than the limit temperature threshold.

[0008] Preferably, the control circuit is adapted to control the displacement of the main pump to increase when the working temperature of the hydraulic motor is lower than the normal working threshold; the control circuit is adapted to control the displacement of the main pump to decrease when the working temperature of the hydraulic motor is higher than the normal working threshold but lower than the limit temperature threshold.

[0009] Preferably, the flushing oil delivered by the auxiliary pump to the hydraulic motor is returned to the oil tank through a return branch; the monitoring module is installed on the return branch, and the working temperature of the hydraulic motor is determined by detecting the temperature of the returned flushing oil by the temperature sensor.

[0010] Preferably, the monitoring module further comprises a metal particle sensor adapted to detect the content of metal particles in the returned flushing oil; the control circuit is adapted to control the output flow of the main pump to decrease to a minimum or 0 when the content of metal particles detected by the metal particle sensor is greater than a set threshold.

[0011] Preferably, the monitoring module further comprises a first flow detection device, and the cooling circuit further comprises a second flow detection device; the first flow detection device is used to detect a first flow of the returned flushing oil, and the second flow detection device is used to detect a second flow output by the auxiliary pump; the control circuit is adapted to decrease the displacement of the main pump to 0 and stop when the difference between the first flow and the second flow is greater than a set threshold.

[0012] Preferably, the control circuit comprises a regulating valve; the regulating valve is adapted to adjust the opening degree thereof to control and adjust the displacement of the main pump.

[0013] Preferably, the main pump is a variable pump, the control circuit further comprises a variable piston cylinder, the output end of the variable piston cylinder is connected to the main pump in cooperation, and the regulating valve is connected between the output end of the main pump and the variable piston cylinder; the regulating valve is adapted to adjust the stroke of the variable piston cylinder to control the displacement of the main pump.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] By detecting the working state of the hydraulic motor and controlling the working state of the main pump according to the detection result, the output speed of the hydraulic motor can be reduced or the hydraulic motor can be directly stopped in time when the hydraulic motor is abnormal, so that the operation safety of the hydraulic motor can be effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall architecture of the present application.

[0017] Figure 2 It is a schematic diagram of the overall hydraulic structure of the present application.

[0018] 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

[0019] In the description of the present application, it should be noted that the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present description.

[0020] In the description of the present application, it should be noted that for orientation words such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The orientation and positional relationship shown in the drawing is based on the orientation or positional relationship shown in the drawing, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0021] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0025] One preferred embodiment of this application, such as Figure 1 As shown, a hydraulic motor monitoring and control system 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 holds hydraulic fluid, and the main pump 200 pumps the fluid from the tank 300 to the hydraulic motor 100, which then converts hydraulic energy into mechanical energy for output. The purpose of this embodiment is to monitor the operating status of the hydraulic motor 100; that is, the monitoring module 400 detects the operating status of the hydraulic motor 100, and the control circuit 500 controls the displacement of the main pump 200 based on the detection results of the monitoring module 400, thereby controlling the output speed of the hydraulic motor 100.

[0026] Specifically, when the monitoring module 400 monitors that the hydraulic motor 100 has an abnormal working state, the control circuit 500 can be used to control the displacement of the main pump 200 to reduce, and then the output speed of the hydraulic motor 100 can be reduced synchronously, and in an extreme case, the main pump 200 can be stopped, that is, the displacement is 0; at this time, the hydraulic motor 100 will also stop working, so that the abnormal state of the hydraulic motor 100 can be effectively inhibited to ensure the safe operation of the hydraulic motor 100 and avoid the spread of the fault.

[0027] It can be understood that the abnormal state of the hydraulic motor 100 during operation includes temperature abnormality, wear abnormality, and leakage, etc. For the wear abnormality and the leakage, the hydraulic motor 100 needs to be stopped in time for maintenance; for the temperature abnormality, it needs to be judged according to the specific situation, if the temperature is only slightly higher than the normal working temperature, then the cooling of the hydraulic motor 100 can be increased, if the temperature is too high, the hydraulic motor 100 needs to be stopped to avoid burning of the hydraulic motor 100. For the convenience of understanding, the control process of the hydraulic motor 100 in the face of different abnormal states will be described in detail below.

[0028] I. For the temperature abnormality of the hydraulic motor 100.

[0029] In this embodiment, as shown in Figure 1 and Figure 2 , the hydraulic motor monitoring and control system of the application further comprises 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.

[0030] It can be understood that during the operation of the hydraulic motor 100, a separate cooling circuit 600 can be set to output flushing oil to the hydraulic motor 100, and then the flushing oil absorbs the heat of the hydraulic motor 100 through heat transfer, and the heat dissipation of the hydraulic motor 100 is realized through the backflow of the flushing oil. When the hydraulic motor 100 is working normally, or the working temperature of the hydraulic motor 100 is low, the cooling circuit 600 can be normally opened or kept closed; when the working temperature of the hydraulic motor 100 exceeds the set threshold, the cooling circuit 600 can be opened or the output of the flushing oil can be increased, so as to accelerate the heat dissipation of the hydraulic motor 100.

[0031] It should be understood that the flushing oil can be directly sprayed on the hydraulic motor 100 to achieve cooling, or the hydraulic motor 100 can be immersed in the flushing oil for cooling.

[0032] Specifically, as shown in Figure 2As shown, the monitoring module 400 comprises a temperature sensor 403, and the cooling circuit 600 comprises a secondary pump 601 and a flow control valve 602. The temperature sensor 403 can detect the working temperature of the hydraulic motor 100; the driving end of the secondary pump 601 is drivingly connected with the main pump 200, so that when the main pump 200 is driven by the motor to work, the secondary pump 601 can rotate synchronously with the main pump 200. The input end of the secondary pump 601 is connected with the oil tank 300, and the output end of the secondary pump 601 extends to the position of the hydraulic motor 100 through a pipeline, so that when the secondary pump 601 works, the oil in the oil tank 300 can be pumped to the position of the hydraulic motor 100 as flushing oil. When the working temperature of the hydraulic motor 100 is higher than the set temperature threshold, the flow control valve 602 can control the displacement of the secondary pump 601 to increase, so as to increase the amount of flushing oil for cooling the hydraulic motor 100 to improve the heat dissipation efficiency of the hydraulic motor 100.

[0033] It should be understood that the specific structure and working principle of the temperature sensor 403, the secondary pump 601 and the flow control valve 602 are known to those skilled in the art, and therefore will not be described in detail here. There are many ways for the flow control valve 602 to control the displacement of the secondary pump 601, which is related to the type of the secondary pump 601. For example, the flow control valve 602 can be installed at the output end of the secondary pump 601, and then the displacement of the secondary pump 601 can be controlled by the opening of the flow control valve 602. For example Figure 2 As shown, the secondary pump 601 is a variable pump, and the displacement of the secondary pump 601 is controlled by a second variable piston cylinder 603 and a third variable piston cylinder 604; the third variable piston cylinder 604 is an elastic cylinder, and 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 drivingly connected to the two ends of the displacement control rod of the secondary pump 601; the flow control valve 602 is connected with the second variable piston cylinder 603, and then the flow control valve 602 supplies oil or returns oil to the rodless cavity of the second variable piston cylinder 603 through a hydraulic circuit to drive the displacement control rod of the secondary pump 601 to rotate to realize displacement control.

[0034] It can be understood that the temperature at which the hydraulic motor 100 can work is limited, and beyond the limit, the hydraulic motor 100 will be burned, which requires the hydraulic motor 100 to be stopped. Then the temperature threshold can be set to include a normal working threshold and a limit temperature threshold, the limit temperature threshold being greater than the normal working threshold. When the working temperature of the hydraulic motor 100 is lower than the normal working threshold, the flow control valve 602 can control the displacement of the auxiliary pump 601 to be reduced. When the working temperature of the hydraulic motor 100 is higher than the normal working threshold but lower than the limit temperature threshold, the flow control valve 602 can control the displacement of the auxiliary pump 601 to be increased. When the working temperature of the hydraulic motor 100 is higher than the limit temperature threshold, the control circuit 500 can control the main pump 200 to be stopped, and then the hydraulic motor 100 will also be stopped.

[0035] It should be noted that the auxiliary pump 601 and the main pump 200 are synchronously driven by the 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.

[0036] It should be understood by those skilled in the art that when the hydraulic motor 100 is working, the working temperature of the hydraulic motor 100 is mainly generated by the output shaft rotation, that is, the faster the output speed of the hydraulic motor 100, the higher the working temperature of the hydraulic motor 100. Therefore, in this embodiment, when the working temperature of the hydraulic motor 100 is lower than the normal working threshold, the control circuit 500 can control the displacement of the main pump 200 to be increased; when the working temperature of the hydraulic motor 100 is higher than the normal working threshold but lower than the limit temperature threshold, the control circuit 500 can control the displacement of the main pump 200 to be reduced.

[0037] Understandably, when the operating temperature of the hydraulic motor 100 is below the normal operating threshold, it indicates that the cooling efficiency of the cooling circuit 600 through flushing oil is greater than the heat generation efficiency of the hydraulic motor 100 during operation. Therefore, the hydraulic motor 100 can appropriately increase its output speed, meaning 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 to improve the cooling efficiency by increasing the amount of flushing oil. If the cooling circuit 600 is already operating at its maximum cooling efficiency, i.e., when the auxiliary pump 601 reaches its maximum displacement, and the cooling efficiency of the cooling circuit 600 is still insufficient to cool the hydraulic motor 100, then the hydraulic motor 100 can reduce its 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 decreased to further accelerate the above-mentioned heat dissipation balancing process.

[0038] It should be understood that there are various methods for the temperature sensor 403 to detect the operating temperature of the hydraulic motor 100. For example, the temperature sensor 403 can directly detect the temperature of the hydraulic motor 100. However, considering that the flushing oil needs to spray or immerse the hydraulic motor 100, the installation of the temperature sensor 403 may be affected, leading to inaccurate detection results. Therefore, in this embodiment, the operating temperature of the hydraulic motor 100 can be determined by the temperature of the flushing oil that has absorbed heat and is then returned.

[0039] Specifically, such as Figure 2 As shown, the flushing oil delivered by the auxiliary pump 601 to the hydraulic motor 100 flows back to the oil tank 300 through the return branch. The monitoring module 400 is installed in the return branch, and the temperature sensor 403 detects the temperature of the returned flushing oil to determine the operating temperature of the hydraulic motor 100.

[0040] Understandably, the temperature of the flushing oil returning from the hydraulic motor 100 during normal operation can be stored as a normal operating threshold. When the flushing oil temperature detected by the temperature sensor 403 exceeds the normal operating threshold, it indicates that the operating temperature of the hydraulic motor 100 is too high, 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.

[0041] II. Regarding the abnormal wear condition of hydraulic motor 100.

[0042] In this embodiment, as Figure 2 As shown, the monitoring module 400 also includes a metal particle sensor 402, which is also located in the return branch, thereby detecting the content of metal particles in the return flushing oil. If the detected metal particle content is greater than a set threshold, the control loop 500 can control the output flow rate of the main pump 200 to be reduced to a minimum or 0.

[0043] Understandably, the wear on the hydraulic motor 100 typically occurs at the output shaft. This means the output shaft may experience bending or other abnormalities under load, leading to vibration during rotation and thus accelerated wear. This increased wear also increases the operating temperature of the hydraulic motor 100 and reduces transmission efficiency. Since the output shaft is generally made of metal, it generates metal particles through friction with the housing during rotation. These metal particles are carried back with the flushing oil. Therefore, the wear condition of the hydraulic motor 100 can be assessed by detecting the metal particle content in the returned flushing oil.

[0044] It should be understood that the specific structure and working principle of the metal particle sensor 402 are well-known to those skilled in the art, and therefore will not be described in detail here. 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 in the hydraulic motor 100, the main pump 200 can reduce the output flow to a minimum to stop the hydraulic motor 100; of course, if the main pump 200 is only used to drive the hydraulic motor 100, then when wear is detected in the hydraulic motor 100, the output flow of the main pump 200 can be directly reduced to 0.

[0045] 3. Regarding the leakage of hydraulic motor 100.

[0046] In this embodiment, as 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 the first flow rate of the flushing oil return, and the second flow detection device 605 is installed at the output end of the auxiliary pump 601 to detect the second flow rate output by the auxiliary pump 601. 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 100 is leaking, and then the displacement of the main pump 200 is reduced to 0 and the pump is stopped through the control circuit 500.

[0047] It can be understood that the flow of the cooling backflow 600 to the flushing oil at the position of the hydraulic motor 100 is theoretically equal to the backflow of the flushing oil; considering the loss of the oil circuit, the difference between the output flow of the flushing oil of the auxiliary pump 601 and the backflow of the flushing oil after cooling can be regarded as a constant value, which is the set threshold value. If the hydraulic motor 100 leaks, the oil delivered by the main pump 200 to the hydraulic motor 100 will flow back with the flushing oil, thereby causing the backflow of the flushing oil to increase, that is, the difference between the output flow of the flushing oil of the auxiliary pump 601 and the backflow of the flushing oil after cooling exceeds the set threshold value, at which time it can be determined that the hydraulic motor 100 leaks. For the leakage of the hydraulic motor 100, shutdown maintenance must be performed.

[0048] In the embodiments of the present application, there are various specific structures of the control circuit 500 capable of realizing displacement control of the main pump 200; in order to facilitate understanding, one of the structures will be described in detail below. As shown in Figure 2 The control circuit 500 includes the regulating valve 501; the regulating valve 501 can adjust the opening degree thereof to control and adjust the displacement of the main pump 200.

[0049] It can be understood that there are various specific implementation manners of the regulating valve 501 to adjust and control the displacement of the main pump 200 through the opening degree thereof. For example, the regulating valve 501 can throttle control the output flow of the main pump 200; for another example, the main pump 200 adopts a variable pump, and then the displacement control can be realized by driving and controlling the variable control rod of the main pump 200. In order to facilitate understanding, the main pump 200 adopting a variable pump will be taken as an example for detailed description below.

[0050] Specifically, as shown in Figure 2 The control circuit 500 further includes a variable piston cylinder, i.e., a first variable piston cylinder 502, the output end of the first variable piston cylinder 502 is drivingly connected with 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 the opening degree thereof to control the amount of oil entering the first variable piston cylinder 502, and then realize displacement control of the main pump 200 by controlling the stroke of the first variable piston cylinder 502.

[0051] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The protection scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hydraulic motor monitoring control system, characterized by, The hydraulic system comprises a hydraulic motor, a main pump, a control circuit, a cooling circuit and a monitoring module; the main pump is adapted to pump oil in an oil tank to the hydraulic motor; the cooling circuit is adapted to deliver flushing oil to the hydraulic motor for cooling; the control circuit is adapted to control the displacement of the main pump; and the monitoring module is adapted to detect the working temperature of the hydraulic motor, so that when the working temperature of the hydraulic motor exceeds a set temperature threshold, the control circuit controls the displacement of the main pump to decrease and / or the cooling circuit increases the output of flushing oil.

2. The hydraulic motor monitoring control system of claim 1, wherein, The monitoring module comprises a temperature sensor, and the cooling circuit comprises a secondary pump and a flow control valve; the temperature sensor is adapted to detect the working temperature of the hydraulic motor; the driving end of the secondary pump is in driving connection with the main pump, the input end of the secondary pump is connected with the oil tank, and the output end of the secondary pump extends to the position of the hydraulic motor through a pipeline; and the flow control valve is adapted to control the displacement of the secondary pump.

3. The hydraulic motor monitoring control system of claim 2, wherein, The temperature threshold comprises a normal working threshold and a limit temperature threshold, and the limit temperature threshold is greater than the normal working threshold; The flow control valve is adapted to control the displacement of the secondary pump to decrease when the working temperature of the hydraulic motor is lower than the normal working threshold; The flow control valve is adapted to control the displacement of the secondary pump to increase when the working temperature of the hydraulic motor is higher than the normal working threshold but lower than the limit temperature threshold; The control circuit is adapted to control the main pump to stop when the working temperature of the hydraulic motor is higher than the limit temperature threshold.

4. The hydraulic motor monitoring control system of claim 3, wherein, The control circuit is adapted to control the displacement of the main pump to increase when the working temperature of the hydraulic motor is lower than the normal working threshold; The control circuit is adapted to control the displacement of the main pump to decrease when the working temperature of the hydraulic motor is higher than the normal working threshold but lower than the limit temperature threshold.

5. The hydraulic motor monitoring control system of claim 2, wherein, The flushing oil delivered by the secondary pump to the hydraulic motor is returned to the oil tank through a return branch; The monitoring module is installed on the return branch, and the temperature sensor detects the temperature of the returned flushing oil to determine the working temperature of the hydraulic motor.

6. The hydraulic motor monitoring control system of claim 5, wherein, The monitoring module further comprises a metal particle sensor adapted to detect the content of metal particles in the returned flushing oil; The control circuit is adapted to control the output flow of the main pump to decrease to a minimum or 0 when the content of metal particles detected by the metal particle sensor is greater than a set threshold.

7. The hydraulic motor monitoring control system of claim 5, wherein, The monitoring module further comprises a first flow detection device, and the cooling circuit further comprises a second flow detection device; The first flow detection device is used to detect the first flow of returned flushing oil, and the second flow detection device is used to detect the second flow output by the secondary pump; The control circuit is adapted to decrease the displacement of the main pump to 0 and stop the main pump when the difference between the first flow and the second flow is greater than a set threshold.

8. The hydraulic motor monitoring control system of any one of claims 1-7, wherein, The control circuit comprises a regulating valve adapted to adjust the opening degree of the regulating valve to control and adjust the displacement of the main pump.

9. The hydraulic motor monitoring control system of claim 8, wherein, The main pump adopts a variable pump, the control circuit further comprises a variable piston cylinder, an output end of the variable piston cylinder is connected with the main pump in a matched mode, and the adjusting valve is connected between an output end of the main pump and the variable piston cylinder; the adjusting valve is suitable for adjusting a stroke of the variable piston cylinder to control the displacement of the main pump.

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