Mine excavation closed type rotary heat dissipation system and control method

Abstract

The invention discloses a mine excavation closed type rotary heat dissipation system and a control method, the mine excavation closed type rotary heat dissipation system comprises a closed type rotary pump, a rotary motor and a closed type rotary system oil temperature sensor, the closed type rotary pump is connected with a reversing valve and a pilot oil supplementing pump, the rotary motor is connected with a rotary motor flushing valve, and the mine excavation closed type rotary heat dissipation system further comprises a rotary pump shell heat dissipation system, a rotary motor shell heat dissipation system and a controller; the rotary pump shell cooling system is provided with an oil dispersing pump and a hydraulic oil tank oil temperature sensor, the rotary motor shell cooling system is provided with a water dispersing pump and a water temperature sensor, and the controller is connected with the closed rotary system oil temperature sensor, the water temperature sensor, the hydraulic oil tank oil temperature sensor, the closed rotary pump, the oil dispersing pump and the water dispersing pump. Under the condition that an existing rotary motor flushing valve heat dissipation system is reserved, a rotary pump shell heat dissipation system and a rotary motor shell heat dissipation system are additionally arranged, heat dissipation is conducted on a rotary pump and a rotary motor, and the problem that the heat dissipation capacity of a closed rotary system is insufficient is solved while heat dissipation of hydraulic oil of the whole vehicle and heat dissipation of water temperature of an engine are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a closed rotary heat dissipation system for mining excavators and a control method thereof. Background Art

[0002] As market demands for excavator controllability and efficiency increase, large mining excavators are beginning to adopt closed-loop swing hydraulic systems. These systems consist of a closed-loop variable displacement pump and a hydraulic motor. The closed-loop variable displacement pump utilizes an integrated design, with the charge pump and valves for charge and relief functions integrated into the hydraulic pump. Because the system's oil is recycled, the resulting heat is difficult to dissipate, so a flush valve is required to remove the hot oil from the system. The charge pump draws cold oil from the hydraulic tank to compensate for the system's oil temperature and neutralize and cool it.

[0003] Since the displacement of the oil charge pump is often not too large, and secondly, the back pressure constraint of the motor housing means that the flushing flow of the flushing valve will not be too high, under the conditions of continuous high-power operation of the excavator, the cooling effect brought by the flushing valve often cannot meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a closed rotary heat dissipation system and control method for mining excavators with a simple structure and good effects.

[0005] The present invention is implemented with the following technical solution: a closed rotary heat dissipation system for mining, comprising a closed rotary pump and a rotary motor forming a closed loop, the closed rotary pump being connected to a reversing valve and a pilot oil supply pump, the rotary motor being connected to a rotary motor flushing valve, the closed loop being provided with a closed rotary system oil temperature sensor, and also comprising a rotary pump housing heat dissipation system and a rotary motor housing heat dissipation system, the rotary pump housing heat dissipation system being provided with an oil dispersion pump and a hydraulic oil tank oil temperature sensor, the rotary motor housing heat dissipation system being provided with a water dispersion pump and a water temperature sensor, and also comprising a controller, the input end of the controller being connected to the closed rotary system oil temperature sensor, the water temperature sensor and the hydraulic oil tank oil temperature sensor, and the output end of the controller being connected to the control ends of the closed rotary pump, the oil dispersion pump and the water dispersion pump.

[0006] It is further: the rotary pump housing heat dissipation system includes an oil dispersion pump and an oil dispersion motor, the oil dispersion pump is connected to an oil dispersion pump solenoid valve, the oil dispersion motor is connected to an oil dispersion fan, an oil radiator is provided on one side of the oil dispersion fan, and the oil radiator is connected to a hydraulic oil tank oil temperature sensor.

[0007] The oil dispersion pump solenoid valve is connected with the controller.

[0008] The rotary motor housing heat dissipation system includes a water dispersion pump and a water dispersion motor, the water dispersion pump is connected to a water dispersion pump solenoid valve, the water dispersion motor is connected to a water dispersion fan, a water radiator is provided on one side of the water dispersion fan, and the water radiator is connected to a water temperature sensor.

[0009] The water dispersion pump solenoid valve is connected with the controller.

[0010] A control method for a closed rotary heat dissipation system in a mining excavator is disclosed. When a hydraulic excavator is operating, the heat dissipation system is activated. The controller detects the closed rotary hydraulic oil temperature, engine water temperature, and hydraulic oil tank oil temperature in the system through a closed rotary system oil temperature sensor, a water temperature sensor, and a hydraulic oil tank oil temperature sensor. The controller then adjusts the power of the closed rotary heat dissipation, hydraulic oil heat dissipation, and engine water heat dissipation in real time based on a flow-current relationship diagram of a water heat dissipation pump and an oil heat dissipation pump. When the oil temperature of the swing system is lower than the alarm temperature, the heat dissipation function of the swing motor flushing valve is mainly used, supplemented by the heat dissipation system of the swing pump housing and the heat dissipation system of the swing motor housing; When the oil temperature of the swing system is higher than the alarm temperature, the swing motor flushing valve heat dissipation, oil cooling motor circuit and water cooling motor circuit can run at full power at the same time.

[0011] When the oil temperature of the rotary system is lower than the alarm temperature, the return oil of the system returns to the hydraulic oil tank through the rotary motor flushing valve, and the pilot oil supply pump replenishes oil to the closed rotary at the same time to complete the closed rotary heat dissipation.

[0012] When the swing system oil temperature is lower than the alarm temperature, the swing pump housing cooling system and the swing motor housing cooling system adjust the system power according to the detection values of the water temperature sensor and the hydraulic oil tank oil temperature sensor, as follows: When the oil temperature F 油 ≦FA, water temperature F 水 When ≦FC, the oil radiator pump current is set to AYH, the water radiator pump current is set to ASH, and the water radiator fan speed is n 水 Oil cooling fan speed n 油 Run at the lowest speed; When the oil temperature FA ≤ F 油 ≤FB, water temperature FC≦F 水 When ≤FD, the oil radiator pump current is set to AYH, and the water radiator pump current is set to ASH. The hydraulic oil cooling system adjusts the hydraulic oil cooling system power in real time according to the oil temperature adjustment range FA-FYJ-FB and the oil radiator pump flow-current relationship diagram. The engine water cooling system adjusts the engine water cooling system power in real time according to the water radiator temperature adjustment range FC-FSJ-FD and the water radiator pump flow-current relationship diagram. The adjustment current range of the oil radiator pump and the water radiator pump is AE-AF. When oil temperature FB ≤ F 油 , water temperature FD ≦ F 水When , the oil radiator pump current is set to AYL, the water radiator pump current is set to ASL, the hydraulic oil radiator system operates at maximum power, and the engine water radiator operates at maximum power; Among them, F 油 is the hydraulic oil tank temperature, F 水 is the water temperature, FA and FC are the hydraulic oil tank oil temperature and water temperature starting adjustment temperature respectively, FB and FD are the hydraulic oil tank oil temperature and water temperature maximum adjustable temperature respectively, FYJ and FSJ are the optimal hydraulic oil tank oil temperature and optimal water temperature respectively, AYH and ASH are the minimum adjustment current of the oil dispersion pump and water dispersion pump respectively, AYL and ASL are the maximum adjustment current of the oil dispersion pump and water dispersion pump respectively, current AF corresponds to the minimum temperature FA and FC, and current AE corresponds to the maximum adjustment temperature FB and FD.

[0013] When the oil temperature of the rotary system is higher than the alarm temperature, the return oil of the system returns to the hydraulic oil tank through the rotary motor flushing valve, and the pilot oil supply pump replenishes oil to the closed rotary at the same time to complete the closed rotary heat dissipation; the rotary pump casing heat dissipation system runs at maximum power, and the oil radiator motor flushes the rotary pump with the maximum return oil volume; the rotary motor casing heat dissipation system runs at maximum power, and the water radiator motor flushes the rotary motor with the maximum return oil volume.

[0014] The present invention has the following advantages: the closed rotary heat dissipation system and control method of the mining excavator of the present invention, while retaining the existing rotary motor flushing valve heat dissipation system, adds a rotary pump housing heat dissipation system and a rotary motor housing heat dissipation system, dissipates heat for the rotary pump and the rotary motor, and solves the problem of insufficient heat dissipation capacity of the closed rotary system while ensuring the heat dissipation of the hydraulic oil of the entire vehicle and the water temperature of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0016] In the attached figure: Figure 1 It is the hydraulic principle diagram of the present invention; Figure 2 It is a system flow chart of the present invention; Figure 3 It is the control principle diagram of the present invention; Figure 4 This is a flow rate and current relationship diagram of the water dispersion pump and the oil dispersion pump of the present invention.

[0017] In the figure: 1. Closed rotary system oil temperature sensor, 2. Closed rotary pump, 3. Reversing valve, 4. Pilot oil feed pump, 5. Rotary motor flushing valve, 6. Rotary motor, 7. Water radiator, 8. Water temperature sensor, 9. Water dispersion fan, 10. Water dispersion motor, 11. Hydraulic oil tank oil temperature sensor, 12. Oil radiator, 13. Oil dispersion fan, 14. Oil dispersion motor, 15. Oil dispersion pump solenoid valve, 16. Oil dispersion pump, 17. Hydraulic oil tank, 18. Water dispersion pump, 19. Water dispersion pump solenoid valve.

[0018] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0022] like Figures 1 to 2A closed rotary cooling system for mining shown in FIG. 1 includes a closed rotary pump 2 and a rotary motor 6 forming a closed loop, wherein the closed rotary pump 2 is connected to a reversing valve 3 and a pilot oil supply pump 4, and the rotary motor 6 is connected to a rotary motor flushing valve 5. The closed loop is provided with a closed rotary system oil temperature sensor 1, and further includes a rotary pump housing cooling system and a rotary motor housing cooling system. The rotary pump housing cooling system is provided with an oil cooling pump 16 and a hydraulic oil tank oil temperature sensor 11, and the rotary motor housing cooling system is provided with a water cooling pump 18 and a water temperature sensor 8, and further includes a controller, wherein the input end of the controller is connected to the closed rotary system oil temperature sensor 1, the water temperature sensor 8 and the hydraulic oil tank oil temperature sensor 11, and the output end of the controller is connected to the control ends of the closed rotary pump 2, the oil cooling pump 16 and the water cooling pump 18. In the closed rotary heat dissipation system for mining of the present invention, the closed rotary pump and the rotary motor form a closed hydraulic system, wherein the closed rotary pump is connected to a pilot oil replenishment pump, which can replenish oil when the closed system is dissipating heat; the rotary motor is connected to a rotary motor flushing valve, which is used in conjunction with the pilot oil replenishment pump to complete the closed rotary heat dissipation; the closed rotary pump and the rotary motor are also respectively connected to a rotary pump housing heat dissipation system and a rotary motor housing heat dissipation system, through which the housings of the rotary pump and the rotary motor are cooled, thereby further enhancing the heat dissipation efficiency of the entire closed system. The closed cooling system, the rotary pump housing cooling system and the rotary motor housing cooling system are controlled by the controller. The closed rotary system oil temperature sensor, the hydraulic oil tank oil temperature sensor and the water temperature sensor are used as input ends. The detected closed rotary hydraulic oil temperature, hydraulic oil tank oil temperature and engine water temperature are input into the controller. Then the controller adjusts the power of the closed rotary cooling, hydraulic oil cooling and engine water cooling in real time according to the flow and current relationship diagram of the water cooling pump and the oil cooling pump, so that the cooling of the entire system is in dynamic balance to achieve better cooling effect.

[0023] like Figure 1The figure shows a closed rotary cooling system for a mining excavator. The rotary pump housing cooling system includes an oil cooling pump 16 and an oil cooling motor 14. The oil cooling pump 16 is connected to an oil cooling pump solenoid valve 15. The oil cooling motor 14 is connected to an oil cooling fan 13. An oil radiator 12 is provided on one side of the oil cooling fan 13. The oil radiator 12 is connected to a hydraulic oil tank oil temperature sensor 11. The oil cooling pump solenoid valve 15 is connected to a controller. The rotary pump casing heat dissipation system of the present invention includes an oil dissipation pump, an oil dissipation motor, an oil dissipation pump solenoid valve, an oil dissipation fan, an oil radiator and a hydraulic oil tank oil temperature sensor. The oil dissipation pump solenoid valve is controlled by a controller to change the flow rate of the oil dissipation pump and output hydraulic oil of different flow rates. The output hydraulic oil drives the oil dissipation motor to rotate, and then drives the oil dissipation fan to dissipate heat to the oil radiator. The oil inlet end of the oil radiator is connected to the return oil of the hydraulic main system, and the oil outlet end of the oil radiator is connected to the hydraulic oil tank. The hydraulic oil temperature is detected in real time by the hydraulic oil tank oil temperature sensor and transmitted to the controller to complete closed-loop control and improve the heat dissipation performance of the rotary pump casing heat dissipation system.

[0024] like Figure 1 The illustrated embodiment of a closed rotary cooling system for mining excavators includes a rotary motor housing cooling system comprising a water dispersion pump 18 and a water dispersion motor 10. The water dispersion pump 18 is connected to a water dispersion pump solenoid valve 19. The water dispersion motor 10 is connected to a water dispersion fan 9. A water radiator 7 is provided on one side of the water dispersion fan 9, and the water radiator 7 is connected to a water temperature sensor 8. The water dispersion pump solenoid valve 19 is connected to a controller. The rotary motor housing cooling system of the present invention includes a water dispersion pump, a water dispersion pump solenoid valve, a water dispersion motor, a water dispersion fan, a water radiator, and a water temperature sensor. The water dispersion pump solenoid valve is controlled by the controller to vary the flow rate of the water dispersion pump, outputting water at varying flow rates. The output water drives the water dispersion motor to rotate, which in turn drives the water dispersion fan to dissipate heat to the water radiator. The oil inlet of the water radiator is connected to the engine water outlet, and the water outlet of the water radiator is connected to a water tank. The water temperature sensor monitors the water temperature in the water tank in real time and transmits it to the controller, completing closed-loop control and improving the heat dissipation performance of the rotary motor housing cooling system.

[0025] like Figures 1 to 4 The control method of a closed rotary cooling system for mining is shown. When the hydraulic excavator is in operation, the cooling system is activated. The controller detects the closed rotary hydraulic oil temperature, engine water temperature, and hydraulic oil tank oil temperature in the system through the closed rotary system oil temperature sensor 1, water temperature sensor 8, and hydraulic oil tank oil temperature sensor 11. Then, based on the flow and current relationship diagram of the water cooling pump and the oil cooling pump, the power of the closed rotary cooling system, hydraulic oil cooling, and engine water cooling is adjusted in real time. When the oil temperature of the swing system is lower than the alarm temperature, the heat dissipation function of the swing motor flushing valve is mainly used, supplemented by the heat dissipation system of the swing pump housing and the heat dissipation system of the swing motor housing; When the oil temperature of the swing system is higher than the alarm temperature, the swing motor flushing valve heat dissipation, oil cooling motor circuit and water cooling motor circuit can run at full power at the same time.

[0026] The control method of the present invention is specifically divided into the following situations, combined with Figures 1 to 4 Describe in detail: 1. When the controller detects the closed rotary oil temperature F 闭 ≦FBL, oil temperature F 油 ≦FA, water temperature F 水 ≦FC: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB is returned to P through the flushing valve of the rotary motor. 回 Hydraulic oil tank, oil supply pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0027] (2) The oil radiator pump current is set to AYH, the water radiator pump current is set to ASH, and the water radiator fan speed is n 水 Oil cooling fan speed n 油 Run at the lowest speed.

[0028] 2. When the controller detects the closed rotary oil temperature F 闭 ≦FBL, oil temperature FA≦F 油 ≤FB, water temperature FC≦F 水 When ≤FD: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0029] (2) The oil cooling pump current is set to AYH, and the water cooling pump current is set to ASH. The hydraulic oil cooling system adjusts the hydraulic oil cooling system power in real time according to the oil temperature adjustment range FA-FYJ-FB and the oil cooling pump flow-current relationship diagram; the engine water cooling system adjusts the engine water cooling system power in real time according to the water cooling temperature adjustment range FC-FSJ-FD and the water cooling pump flow-current relationship diagram. Among them, the hydraulic oil temperature adjustment range: the lowest starting temperature FA corresponds to the oil cooling pump current AF, the maximum adjustable temperature FB corresponds to the oil cooling pump current AE, when the oil temperature changes between FA-FB, the current changes linearly between AF-AE; the water temperature adjustment range: the lowest starting temperature FC corresponds to the oil cooling pump current AF, the maximum adjustable temperature FD corresponds to the oil cooling pump current AE, when the oil temperature changes between FC-FD, the current changes linearly between AF-AE.

[0030] 3. When the controller detects the closed rotary oil temperature F 闭≦FBL, oil temperature FB≦F 油 , water temperature FD ≦ F 水 hour: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0031] (2) The oil dispersion pump current is set to AYL, the water dispersion pump current is set to ASL, the hydraulic oil dispersion system operates at maximum power, and the engine water dispersion operates at maximum power.

[0032] 4. When the controller detects the closed rotary oil temperature F BL ≤F 闭 ≤F BH , oil temperature F 油 ≦FA, water temperature F 水 ≦FC: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0033] (2) The oil radiator pump current is set to AYH, the water radiator pump current is set to ASH, and the water radiator fan speed is n 水 Oil cooling fan speed n 油 Run at the lowest speed.

[0034] 5. When the controller detects the closed rotary oil temperature F BL ≤F 闭 ≤F BH , oil temperature FA ≦ F 油 ≤FB, water temperature FC≦Fwater≤FD: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0035] (2) The oil radiator pump current is set to AYH, and the water radiator pump current is set to ASH. The hydraulic oil cooling system adjusts the hydraulic oil cooling system power in real time according to the oil temperature adjustment range FA-FYJ-FB and the oil radiator pump flow-current relationship diagram. The engine water cooling system adjusts the engine water cooling system power in real time according to the water radiator temperature adjustment range FC-FSJ-FD and the water radiator pump flow-current relationship diagram.

[0036] 6. When the controller detects the closed rotary oil temperature F BL ≤F closed ≤F BH , oil temperature FB≦F 油 , water temperature FD ≦ F 水 hour: (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0037] (2) The oil dispersion pump current is set to AYL, the water dispersion pump current is set to ASL, the hydraulic oil dispersion system operates at maximum power, and the engine water dispersion operates at maximum power.

[0038] 7. When the controller detects the closed rotary oil temperature F 闭 ≥F BH , (1) The closed rotary pump operates normally. Assuming that PA is the inlet and PB is the return oil, the return oil from PB flows through the rotary motor flushing valve P. 回 Return to hydraulic oil tank, charge pump P 补 At the same time, oil is added to the closed rotation to complete the closed rotation heat dissipation.

[0039] (2) When the oil dispersion pump current is AYL, the hydraulic oil dispersion system runs at maximum power, and the oil dispersion motor flushes the rotary pump with the maximum return oil volume; when the water dispersion pump current is ASL, the engine water dispersion runs at maximum power, and the water dispersion motor flushes the rotary motor with the maximum return oil volume.

[0040] Among them, PA and PB are closed rotary oil circuits, P 补 To replenish oil for the charge pump, P 回 F is the oil return of the flushing valve, 闭 is the closed rotary oil temperature, F 油 is the hydraulic oil tank temperature, F 水 is the water temperature, FA and FC are respectively the hydraulic oil tank oil temperature and the water temperature starting temperature, FB and FD are respectively the hydraulic oil tank oil temperature and the water temperature maximum adjustable temperature, FYJ and FSJ are respectively the optimal hydraulic oil tank oil temperature and the optimal water temperature, AYH and ASH are respectively the minimum regulating current of the oil dispersion pump and the water dispersion pump, AYL and ASL are respectively the maximum regulating current of the oil dispersion pump and the water dispersion pump, the current AF corresponds to the minimum temperature FA and FC, the current AE corresponds to the maximum starting temperature FB and FD, F BL F is the starting temperature for closed rotary oil temperature regulation. BH It is the closed rotary oil temperature alarm temperature.

[0041] The closed rotary heat dissipation system and control method for mining excavators of the present invention add a rotary pump casing heat dissipation system and a rotary motor casing heat dissipation system on the basis of the original closed heat dissipation system, thereby realizing heat dissipation of the rotary pump casing and the rotary motor pump casing. The closed rotary hydraulic oil temperature, engine water temperature and hydraulic oil tank oil temperature in the system are detected in real time by a controller, and the power of the closed rotary heat dissipation, hydraulic oil heat dissipation and engine water heat dissipation is adjusted in real time according to the flow-current relationship diagram of the water heat dissipation pump and the oil heat dissipation pump. When the oil temperature of the rotary system is relatively low, the heat dissipation function of the rotary motor flushing valve is mainly used, and the oil heat dissipation motor circuit and the water heat dissipation motor circuit are auxiliary. When the oil temperature of the rotary system is relatively high, the heat dissipation of the rotary motor flushing valve, the oil heat dissipation motor circuit and the water heat dissipation motor circuit can operate at full power at the same time, thereby realizing dynamic adjustment of the heat dissipation performance of the entire system and improving the heat dissipation efficiency of the entire closed rotary heat dissipation system of mining excavators.

[0042] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0043] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A closed rotary heat dissipation system for mining excavation, characterized by: The invention comprises a closed rotary pump (2) and a rotary motor (6) constituting a closed loop, wherein the closed rotary pump (2) is connected to a reversing valve (3) and a pilot oil supply pump (4), and the rotary motor (6) is connected to a rotary motor flushing valve (5). The closed loop is provided with a closed rotary system oil temperature sensor (1), and further comprises a rotary pump housing heat dissipation system and a rotary motor housing heat dissipation system, wherein the rotary pump housing heat dissipation system is provided with an oil dispersion pump (16) and a hydraulic oil tank oil temperature sensor (11), and the rotary motor housing heat dissipation system is provided with a water dispersion pump (18) and a water temperature sensor (8), and further comprises a controller, wherein an input end of the controller is connected to the closed rotary system oil temperature sensor (1), the water temperature sensor (8) and the hydraulic oil tank oil temperature sensor (11), and an output end of the controller is connected to control ends of the closed rotary pump (2), the oil dispersion pump (16) and the water dispersion pump (18).

2. A closed rotary cooling system for mining excavators according to claim 1, characterized in that: The rotary pump housing heat dissipation system comprises an oil dispersion pump (16) and an oil dispersion motor (14), wherein the oil dispersion pump (16) is connected to an oil dispersion pump solenoid valve (15), and the oil dispersion motor (14) is connected to an oil dispersion fan (13). An oil radiator (12) is provided on one side of the oil dispersion fan (13), and the oil radiator (12) is connected to an oil temperature sensor (11) of a hydraulic oil tank.

3. A closed rotary cooling system for mining excavators as claimed in claim 2, characterized in that: The oil dispersion pump solenoid valve (15) is connected to the controller.

4. The closed rotary heat dissipation system for mining excavation according to claim 1, characterized in that: The rotary motor housing heat dissipation system comprises a water dispersion pump (18) and a water dispersion motor (10), wherein the water dispersion pump (18) is connected to a water dispersion pump solenoid valve (19), and the water dispersion motor (10) is connected to a water dispersion fan (9). A water radiator (7) is provided on one side of the water dispersion fan (9), and the water radiator (7) is connected to a water temperature sensor (8).

5. A closed rotary cooling system for mining excavators as claimed in claim 4, characterized in that: The water dispersion pump solenoid valve (19) is connected to the controller.

6. A control method for a closed rotary cooling system for mining excavation according to claim 1, characterized in that: When the hydraulic excavator is working, the cooling system is started, and the controller detects the closed swing hydraulic oil temperature, engine water temperature and hydraulic oil tank oil temperature in the system through the closed swing system oil temperature sensor (1), water temperature sensor (8) and hydraulic oil tank oil temperature sensor (11), and then adjusts the power of the closed swing cooling, hydraulic oil cooling and engine water cooling in real time according to the flow current relationship diagram of the water cooling pump and the oil cooling pump; When the oil temperature of the swing system is lower than the alarm temperature, the heat dissipation function of the swing motor flushing valve is mainly used, supplemented by the heat dissipation system of the swing pump housing and the heat dissipation system of the swing motor housing; When the oil temperature of the swing system is higher than the alarm temperature, the swing motor flushing valve heat dissipation, oil cooling motor circuit and water cooling motor circuit can run at full power at the same time.

7. The control method of a closed rotary cooling system for mining excavation according to claim 6, characterized in that: When the oil temperature of the swing system is lower than the alarm temperature, the return oil of the system returns to the hydraulic oil tank through the swing motor flushing valve (5), and the pilot oil supply pump (4) simultaneously supplies oil to the closed swing to complete the closed swing heat dissipation.

8. The control method of a closed rotary cooling system for mining excavation according to claim 6, characterized in that: When the oil temperature of the rotary system is lower than the alarm temperature, the rotary pump housing heat dissipation system and the rotary motor housing heat dissipation system adjust the system power according to the detection values of the water temperature sensor (8) and the hydraulic oil tank oil temperature sensor (11), as follows: When the oil temperature F 油 ≦FA, water temperature F 水 When ≦FC, the oil radiator pump current is set to AYH, the water radiator pump current is set to ASH, and the water radiator fan speed is n 水 Oil cooling fan speed n 油 Run at the lowest speed; When the oil temperature FA ≤ F 油 ≤FB, water temperature FC≦F 水 When ≤FD, the oil radiator pump current is set to AYH, and the water radiator pump current is set to ASH. The hydraulic oil cooling system adjusts the hydraulic oil cooling system power in real time according to the oil temperature adjustment range FA-FYJ-FB and the oil radiator pump flow-current relationship diagram. The engine water cooling system adjusts the engine water cooling system power in real time according to the water radiator temperature adjustment range FC-FSJ-FD and the water radiator pump flow-current relationship diagram. The adjustment current range of the oil radiator pump and the water radiator pump is AE-AF. When oil temperature FB ≤ F 油 , water temperature FD ≦ F 水 When , the oil radiator pump current is set to AYL, the water radiator pump current is set to ASL, the hydraulic oil radiator system operates at maximum power, and the engine water radiator operates at maximum power; Among them, F 油 is the hydraulic oil tank temperature, F 水 is the water temperature, FA and FC are the hydraulic oil tank oil temperature and water temperature starting adjustment temperature respectively, FB and FD are the hydraulic oil tank oil temperature and water temperature maximum adjustable temperature respectively, FYJ and FSJ are the optimal hydraulic oil tank oil temperature and optimal water temperature respectively, AYH and ASH are the minimum adjustment current of the oil dispersion pump and water dispersion pump respectively, AYL and ASL are the maximum adjustment current of the oil dispersion pump and water dispersion pump respectively, current AF corresponds to the minimum temperature FA and FC, and current AE corresponds to the maximum adjustment temperature FB and FD.

9. The control method of a closed rotary cooling system for mining excavation according to claim 6, characterized in that: When the oil temperature of the rotary system is higher than the alarm temperature, the return oil of the system returns to the hydraulic oil tank through the rotary motor flushing valve (5), and the pilot oil supply pump (4) simultaneously supplies oil to the closed rotary to complete the closed rotary heat dissipation; the rotary pump housing heat dissipation system operates at maximum power, and the oil dispersion motor (14) flushes the rotary pump with the maximum return oil volume; the rotary motor housing heat dissipation system operates at maximum power, and the water dispersion motor (10) flushes the rotary motor with the maximum return oil volume.

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