Intelligent drill jumbo hydraulic oil temperature control system and control method

Abstract

The application discloses a kind of intelligent rock drilling jumbo hydraulic oil temperature control system and control method, including control unit, execution unit, oil return unit, heat dissipation unit and detection unit, control unit includes controller, solenoid valve, pressure reducing valve, execution unit includes execution cylinder and ball valve, oil return unit includes total oil return pipe, first oil return branch pipe, second oil return branch pipe, detection unit includes oil tank and temperature sensor.Solenoid valve is electrically connected with controller, and is connected with pressure reducing valve oil circuit.Execution cylinder big cavity, small cavity are connected with solenoid valve oil circuit respectively, and ball valve is mechanically connected with oil cylinder telescopic rod.Total oil return pipe and first oil return branch pipe and second oil return branch pipe keep passage, wherein first oil return branch pipe is communicated ball valve, and ball valve is communicated with oil tank oil circuit.Second oil return branch pipe is communicated heat dissipation unit, and heat dissipation unit is communicated oil tank.One end of temperature sensor is connected oil tank, and the other end is connected controller.The application hydraulic pipeline arrangement is simple, convenient to operate, and oil temperature control precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to a rock drilling jumbo, in particular to an intelligent rock drilling jumbo hydraulic oil temperature control system and control method. BACKGROUND

[0002] The optimal working temperature of the intelligent rock drilling jumbo hydraulic system is usually limited within a certain range, and below the lower limit of the temperature range and above the upper limit of the temperature range, the drilling efficiency will be reduced and the drilling speed will be slowed down. The hydraulic oil cooling system is an important part of the intelligent rock drilling jumbo hydraulic system, which can cool the high-temperature hydraulic oil and avoid cooling the low-temperature hydraulic oil, so that the temperature of the hydraulic oil is in the best state, the working efficiency of the hydraulic system is improved, and the normal work of the rock drilling jumbo is ensured.

[0003] The existing rock drilling jumbo usually adopts the temperature control valve to realize the hydraulic oil cooling, and the scheme is shown in the attached Figure 4 The cooling system has four temperature control valves. Each temperature control valve has three oil ports, which are the oil inlet a, the hot oil outlet b and the cold oil outlet c. When the temperature of the oil inlet a is lower than 49℃, the total oil return port T hydraulic oil flows out from the cold oil port c, without passing through the cooler L, and directly returns to the oil tank; when the temperature of the hot oil port b is greater than 63℃, the total oil return port T hydraulic oil flows out from the hot oil port b, and all passes through the cooler L, and then returns to the oil tank after cooling; when the temperature of the hot oil port b is greater than 49℃ and less than 63℃, the temperature control valve W is opened proportionally. At this time, part of the total oil return port T hydraulic oil directly returns to the oil tank through the cold oil port c, and the other part returns to the oil tank through the cooler L from the hot oil port b. As can be seen, by distributing the flow ratio of the two oil outlets of the temperature control valve, the flow into the cooler L can be controlled, and then the temperature of the hydraulic system can be controlled.

[0004] In practical applications, there are at least three problems in the prior art: 1. There are many pipelines and the pipeline is particularly complex, which is difficult to arrange. Generally, the flow of the hydraulic temperature control valve is below 250L / min, while the computerized rock drilling rig is usually a three-arm or four-arm structure, and the total oil return flow is 750-1000L / min. Therefore, four temperature control valves are needed in parallel, and each temperature control valve has three oil pipes, so a total of 12 pipes are needed; 2. The oil temperature control precision is not high, and the control effect is not ideal. Because the temperature of the existing temperature control valve is controlled by itself and does not accept the oil temperature feedback signal of the hydraulic system, it is an open-loop system. In practice, the ambient temperature, the cooling water temperature, the processing deviation of the temperature control valve, and the water quality will all affect the adjustment of the temperature control valve. Therefore, in the actual use process, it is difficult for the existing heat dissipation system to control the temperature within a reasonable range; 3. The system back pressure is high, and the large pressure loss is caused by the many pipelines, especially when the system flow is large. In practical applications, because of the limitation of the temperature control valve capacity, the pipeline to the temperature control valve cannot be too large, and the pressure loss is large after the pipeline passes through various excessive joints and reducing joints. Therefore, the back pressure of the existing scheme is generally large, and is usually about 20bar in a three-arm rock drilling rig. SUMMARY

[0005] The purpose of the present application is to improve the existing problems, and provide an intelligent rock drilling rig hydraulic oil temperature control system and a control method thereof, which can greatly reduce the pipeline complexity of the oil temperature control system, is very convenient to arrange, and has high oil temperature control precision and good control effect.

[0006] To achieve the above-mentioned purpose, on the one hand, the present application provides an intelligent rock drilling rig hydraulic oil temperature control system, which comprises a control unit, an execution unit, an oil return unit, a heat dissipation unit and a detection unit. The control unit comprises a controller, an electromagnetic valve and a pressure reducing valve. The execution unit comprises an execution oil cylinder and a ball valve. The oil return unit comprises a total oil return pipe, a first oil return branch pipe and a second oil return branch pipe. The detection unit comprises an oil tank and a temperature sensor. The electromagnetic valve is electrically connected with the controller and connected with the oil way of the pressure reducing valve. The large cavity and the small cavity of the execution oil cylinder are respectively connected with the oil way of the electromagnetic valve. The ball valve is mechanically connected with the telescopic rod of the oil cylinder. The total oil return pipe is connected with the first oil return branch pipe and the second oil return branch pipe. The first oil return branch pipe is connected with the ball valve. The ball valve is connected with the oil way of the oil tank. The second oil return branch pipe is connected with the heat dissipation unit. The heat dissipation unit is connected with the oil tank. One end of the temperature sensor is fixedly connected with the oil tank, and the other end is electrically connected with the controller.

[0007] Further, the control unit further comprises a damping speed regulating hole, which is arranged on the oil way connecting the electromagnetic valve and the large cavity of the execution oil cylinder, and is used for limiting the opening and closing speed of the execution oil cylinder.

[0008] Further, the diameter of the damping speed regulating hole is 0.6-1.0 mm.

[0009] Preferably, the diameter of the damping speed regulating hole is 0.8 mm.

[0010] Further, the electromagnetic valve is a two-position four-way valve, and the pressure reducing valve is a constant pressure reducing valve.

[0011] Further, the execution unit further comprises a mounting plate and a rotating plate, one end of the mounting plate is rotatably connected to one end of the rotating plate from the upper surface, and rotatably connected to the ball valve from the lower surface, the other end of the mounting plate is rotatably connected to the rodless end of the execution cylinder, and the other end of the rotating plate is rotatably connected to the rod end of the execution cylinder.

[0012] Further, the execution unit further comprises a lubrication point arranged on the side surface of the mounting plate.

[0013] Further, the heat dissipation unit is a water-cooled or air-cooled radiator.

[0014] Further, the temperature sensor is arranged at the oil suction port of the oil tank pump.

[0015] In another aspect, the present application also provides an intelligent drill jumbo hydraulic oil temperature control method, wherein the hydraulic oil temperature Ts=(T1+T2) / 2 is set, T1 is the lower limit of the hydraulic oil temperature, T2 is the upper limit of the hydraulic oil temperature, and T3 is the shutdown temperature. T1, T2, Ts, and T3 are reasonably set, and the T control method is as follows.

[0016] Step 1: detect the oil tank hydraulic oil temperature T, the controller receives the hydraulic oil temperature signal, and compares it with the temperatures T1, T2, and Ts.

[0017] If the measured temperature T is less than the lower limit of the hydraulic oil temperature T1, go to step 2.

[0018] If the temperature T is rising, and the lower limit T1 is less than the temperature T and the upper limit of the oil temperature T2, go to step 3.

[0019] If the temperature T is falling, and the lower limit T1 is less than the temperature T and the upper limit of the oil temperature T2, go to step 4.

[0020] If the upper limit T2 is less than the temperature T and the shutdown temperature T3, go to step 5.

[0021] If the shutdown temperature T3 is less than the temperature T, go to step 6.

[0022] Step 2: in the time period t0-t1, the measured temperature T is less than the lower limit of the hydraulic oil temperature T1, the electromagnetic valve 1.2 is de-energized, and the ball valve 2.2 is in the fully open state. The hydraulic oil return is directly returned to the oil tank 5.1 without passing through the heat dissipation unit 4. Therefore, at this time, the oil temperature T of the oil tank 5.1 rises rapidly.

[0023] Step 3: In the time period t1-t2, t3-t4, the temperature T is rising, and the lower limit T1 < the temperature T < the upper limit T2 of the oil temperature, the solenoid valve 1.2 is powered on for 1S, and the ball valve 2.2 is in a semi-open state. The hydraulic oil return part directly returns to the oil tank 5.1, and part of the oil is cooled by the cooler 4. Therefore, at this time, the oil temperature T of the oil tank 5.1 slowly rises.

[0024] Step 4: In the time period t2-t3, the temperature T is falling, and the lower limit T1 < the temperature T < the upper limit T2 of the oil temperature, the solenoid valve 1.2 is powered on, and the ball valve 2.2 is in a fully open state. The hydraulic oil return is all cooled by the heat dissipation unit. Therefore, at this time, the oil temperature T of the oil tank 5.1 slowly falls.

[0025] Step 5: In the time period t4-t5, the upper limit T2 < the temperature T < the shutdown temperature T3, the solenoid valve 1.2 is powered on, and the ball valve 2.2 is in a fully open state. The hydraulic oil return is all cooled by the heat dissipation unit 4.

[0026] Step 6: In the time period > t5, the shutdown temperature T3 < the temperature T, the system fails, and the 6 control unit immediately controls the main motor to stop.

[0027] Step 7: Repeat step 1.

[0028] The beneficial effects of the present application are: compared with the existing problems of the rock drilling jumbo hydraulic oil temperature control system, such as complex pipeline connection, low temperature precision control, high system back pressure and the like, the present application has the following advantages: 1. The pipeline complexity is greatly reduced, and the arrangement is very convenient. The present application only needs two pipelines, one pipeline (which needs to be cooled) into the cooler water cooling, and the other pipeline (which does not need to be cooled) directly returns to the oil tank; 2. The oil temperature control precision is high, and the control effect is good. The present application uses a closed-loop control system, and the analog temperature sensor installed in the oil tank can transmit the oil temperature to the controller in real time, and the controller determines whether to open or close the temperature control ball valve according to the control effect. The temperature can be controlled in the most reasonable range. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the hydraulic principle control schematic diagram of the present application.

[0030] Figure 2 is the execution unit structure schematic diagram.

[0031] Figure 3 is the control logic schematic diagram of the present application.

[0032] Figure 4 is the temperature control hydraulic principle schematic diagram of the prior art.

[0033] In the diagram, 1-Control unit, 1.1-Controller, 1.2-Solenoid valve, 1.3-Pressure reducing valve, 1.4-Damping speed regulating hole, 2-Actuation unit, 2.1-Actuation cylinder, 2.2-Ball valve, 2.3-Mounting plate, 2.4-Rotating plate, 2.5-Lubrication point, 3-Return oil unit, 3.0-Main return oil pipe, 3.1-First return oil branch pipe, 3.2-Second return oil branch pipe, 4-Cooling unit, 5-Detection unit, 5.1-Oil tank, 5.2-Temperature sensor. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, an intelligent rock drilling rig hydraulic oil temperature control system includes a control unit 1, an execution unit 2, a return oil unit 3, a heat dissipation unit 4, and a detection unit 5. The control unit includes a controller 1.1, a solenoid valve 1.2, and a pressure reducing valve 1.3. The execution unit 2 includes an execution cylinder 2.1 and a ball valve 2.2. The return oil unit 3 includes a main return oil pipe 3.0, a first return oil branch pipe 3.1, and a second return oil branch pipe 3.2. The detection unit 5 includes an oil tank 5.1 and a temperature sensor 5.2. The solenoid valve 1.2 is electrically connected to the controller 1.1 and the pressure reducing valve 1.3. 3. Oil circuit connection; the large and small chambers of the actuator cylinder 2.1 are respectively connected to the oil circuit of the solenoid valve 1.2, and the ball valve 2.2 is mechanically connected to the cylinder extension rod; the main return oil pipe 3.0 is connected to the first return oil branch pipe 3.1 and the second return oil branch pipe 3.2, wherein the first return oil branch pipe 3.1 is connected to the ball valve 2.2, and the ball valve 2.2 is connected to the oil tank 5.1; the second return oil branch pipe 3.2 is connected to the heat dissipation unit 4, and the heat dissipation unit 4 is connected to the oil tank 5.1; one end of the temperature sensor 5.2 is fixedly connected to the oil tank 5.1, and the other end is electrically connected to the controller 1.1.

[0036] The main return oil pipe is a large-diameter return pipe. The return oil from each drill arm first merges at the front of the chassis, and then flows back to the oil tank 5.1 via the main return oil pipe 3.0. This significantly reduces the number of pipelines and effectively lowers the return oil back pressure. Considering the large flow rate of the return oil pipe, flange connections are used at all ports of the main return oil pipe 3.0 for easy disassembly and maintenance.

[0037] The control unit also includes a damping speed regulating orifice 1.4, located in the oil line connecting the solenoid valve 1.2 and the large chamber of the actuator cylinder 2.1. This orifice limits the opening and closing speed of the actuator cylinder 2.1 and can also position the cylinder at a specific opening degree. If the diameter of the damping speed regulating orifice 1.4 is too large, the actuator cylinder 2.1 will open and close too quickly, impacting the hydraulic system, especially the cooling unit 4. Simultaneously, excessively rapid opening and closing of the actuator cylinder 2.1 will also cause mechanical impact to its own mechanical structure, such as the hinge nut and pin, affecting its lifespan. In this invention, excessive speed makes it difficult for the actuator cylinder 2.1 to be positioned at a specific point, making it difficult to keep the ball valve 2.2 in a half-open state. If the diameter of the damping speed regulating orifice 1.4 is too small, it is easily clogged by dirt, reducing reliability. Generally, the diameter of the damping speed regulating orifice is 0.6-1.0 mm, preferably 0.8 mm, in which case the ball valve 2.2 takes approximately 2 seconds to go from fully open to fully closed.

[0038] Solenoid valve 1.2 is a two-position four-way valve with electromagnetic reversing and spring return. When the oil temperature is below a certain temperature, the coil of solenoid valve 1 is de-energized, and solenoid valve 1.2 operates in the second working position, actuating cylinder 2.1's large chamber (rodless chamber) receives oil. When the oil temperature is above a certain temperature, the coil of solenoid valve is energized, and solenoid valve 1.2 operates in the first working position, actuating cylinder 2.1's small chamber (rod chamber) receives oil.

[0039] Pressure reducing valve 1.3 is a constant-pressure reducing valve used to ensure the stability of the inlet oil pressure of control unit 1. If the oil pressure of pressure reducing valve 1.3 is too high, the linear motion of actuator 2.1 and the rotational motion of ball valve 2.2 will be too fast, resulting in excessive impact and inability to position. If the oil pressure of pressure reducing valve 1.3 is too low, the linear motion of actuator 2.1 and the rotational motion of ball valve 2.2 will be too slow, resulting in excessive system delay and insufficient response. Therefore, the pressure of pressure reducing valve 1.3 should be set within a suitable range, generally between 120-160 bar.

[0040] like Figure 2 As shown, the execution unit 2 also includes a mounting plate 2.3 and a rotating plate 2.4. The mounting plate 2.3 is mounted on the vehicle body or the fuel tank 5.1. One end of the mounting plate 2.3 is rotatably connected to one end of the rotating plate 2.4 from its upper surface and rotatably connected to the ball valve 2.2 from its lower surface. The other end of the mounting plate 2.3 is rotatably connected to the rodless end of the execution cylinder 2.1, and the other end of the rotating plate 2.4 is rotatably connected to the rod end of the execution cylinder 2.1.

[0041] The actuator 2 also includes a lubrication point 2.5, which is located on the side of the mounting plate 2.2 and is used to lubricate the hinge point between the mounting plate 2.3 and the rotating plate 2.4. The lubrication point 2.5 is a grease lubrication point.

[0042] The ball valve 2.2 is a large-diameter two-way ball valve, the left port is an oil inlet port, and the right port is an oil outlet port. The large-diameter ball valve has a small pressure loss of hydraulic oil flowing therethrough, and when the ball valve 2.2 is opened, more hydraulic oil can pass therethrough rather than passing through the heat dissipation unit 4. In this embodiment, the diameter of the ball valve is generally 1.2 inches or 1.5 inches.

[0043] The execution oil cylinder 2.1 is a double-acting hydraulic cylinder, which can open and close the ball valve 2.2. When the execution oil cylinder 2.1 is fully retracted, the ball valve 2.2 is fully closed. When the execution oil cylinder 2.1 is fully extended, the ball valve 2.2 is fully opened. When the execution oil cylinder 2.1 is in an intermediate position of extension or retraction, the ball valve 2.2 is also in a throttling state of half opening and half closing. At this time, only a part of the hydraulic oil flows through the ball valve 2.2, and the other part of the hydraulic oil flows through the heat dissipation unit 4. The stroke of the execution oil cylinder 2.1 needs to be set in a reasonable range. If the stroke is too long, the structure size will be too large and inconvenient to install. If the stroke is too short, the ball valve 2.2 will move too fast, which will cause hydraulic impact on the heat dissipation unit 4 and is not easy to be in the intermediate position.

[0044] In this embodiment, the heat dissipation unit 4 is a water-cooled radiator. Of course, in a water-deficient environment such as high altitude, an air-cooled radiator can also be used.

[0045] In order to truly reflect the oil temperature, the temperature sensor 5.2 is arranged at the oil suction port of the oil tank pump.

[0046] The application also provides an intelligent drill jumbo hydraulic oil temperature control method, as shown in the figure. Figure 3 The hydraulic oil temperature Ts=(T1+T2) / 2 is set, T1 is the lower limit of the hydraulic oil temperature, T2 is the upper limit of the hydraulic oil temperature, and T3 is the shutdown temperature. T1, T2, Ts, and T3 need to be reasonably set, and the T control method is as follows.

[0047] Step 1: detect the oil tank hydraulic oil temperature T, the controller receives the hydraulic oil temperature signal, and compares it with the temperatures T1, T2, and Ts.

[0048] If the measured temperature T is less than the lower limit of the hydraulic oil temperature T1, go to step 2.

[0049] If the temperature T is rising, and the lower limit T1 is less than the temperature T and the upper limit of the oil temperature T2, go to step 3.

[0050] If the temperature T is falling, and the lower limit T1 is less than the temperature T and the upper limit of the oil temperature T2, go to step 4.

[0051] If the upper limit T2 is less than the temperature T and the shutdown temperature T3, go to step 5.

[0052] If the shutdown temperature T3 is less than the temperature T, go to step 6.

[0053] Step 2: In the time period of t0-t1, the temperature T is lower than the lower limit of the hydraulic oil temperature T1, the electromagnetic valve 1.2 is controlled to be de-energized, and the ball valve 2.2 is in the fully open state. The hydraulic return oil is directly returned to the oil tank 5.1 without passing through the heat dissipation unit 4. Therefore, the oil tank oil temperature T rises rapidly at this time.

[0054] Step 3: In the time period of t1-t2, t3-t4, the temperature T is rising, and the lower limit T1 is lower than the temperature T, which is lower than the upper limit of the oil temperature T2. The electromagnetic valve 1.2 is controlled to be energized, and the ball valve 2.2 is in the half-open state. The hydraulic return oil is partially directly returned to the oil tank 5.1 and partially returned to the oil tank 5.1 through the heat dissipation unit 4. Therefore, the oil tank oil temperature T rises slowly at this time.

[0055] Step 4: In the time period of t2-t3, the temperature T is falling, and the lower limit T1 is lower than the temperature T, which is lower than the upper limit of the oil temperature T2. The electromagnetic valve 1.2 is controlled to be energized, and the ball valve 2.2 is in the fully closed state. The hydraulic return oil is completely returned to the oil tank 5.1 through the heat dissipation unit 4. Therefore, the oil tank oil temperature T falls slowly at this time.

[0056] Step 5: In the time period of t4-t5, the upper limit T2 is lower than the temperature T, which is lower than the shutdown temperature T3. The electromagnetic valve 1.2 is controlled to be energized, and the ball valve 2.2 is in the fully closed state. The hydraulic return oil is completely returned to the oil tank 5.1 through the heat dissipation unit 4.

[0057] Step 6: In the time period of >t5, the shutdown temperature T3 is lower than the temperature T, the system fails, and the controller 1.1 immediately controls the main motor to stop.

[0058] Step 7: Repeat step 1.

[0059] The above control method clearly and explicitly describes the working condition of the intelligent drill rig hydraulic oil temperature control system. Overall, compared with the prior art, the pipeline complexity is greatly reduced, and the arrangement is very convenient. Since the closed-loop control system is adopted, the temperature can be accurately controlled.

[0060] The embodiments of the application are described in detail above with reference to the accompanying drawings, but the application is not limited thereto. Various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the application, and all such changes are within the scope of protection of the claims of the application.

Claims

1. A method for controlling the temperature of hydraulic oil in a smart jumbo, characterized by: The application relates to a hydraulic oil temperature control system, which comprises a control unit (1), an execution unit (2), an oil return unit (3), a heat dissipation unit (4) and a detection unit (5), wherein the control unit (1) comprises a controller (1.1), an electromagnetic valve (1.2) and a pressure reducing valve (1.3), the execution unit (2) comprises an execution oil cylinder (2.1) and a ball valve (2.2), the oil return unit (3) comprises a total oil return pipe (3.0), a first oil return branch pipe (3.1) and a second oil return branch pipe (3.2), and the detection unit (5) comprises an oil tank (5.1) and a temperature sensor (5.2). The electromagnetic valve (1.2) is electrically connected with the controller (1.1) and is connected with the pressure reducing valve (1.3) in an oil circuit; the large cavity and the small cavity of the execution oil cylinder (2.1) are respectively connected with the electromagnetic valve (1.2) in an oil circuit, the ball valve (2.2) is mechanically connected with the telescopic rod of the oil cylinder, the total oil return pipe (3.0) keeps communication with the first oil return branch pipe (3.1) and the second oil return branch pipe (3.2), the first oil return branch pipe (3.1) is communicated with the ball valve (2.2), the ball valve (2.2) is communicated with the oil tank (5.1) in an oil circuit, the second oil return branch pipe (3.2) is communicated with the heat dissipation unit (4), the heat dissipation unit (4) is communicated with the oil tank (5.1), one end of the temperature sensor (5.2) is fixedly connected with the oil tank (5.1), and the other end is electrically connected with the controller (1.1). wherein the hydraulic oil temperature T is set s = (T1+T2) / 2, T1 is the lower limit temperature of the hydraulic oil temperature, T2 is the upper limit temperature of the hydraulic oil temperature, and T3 is the shutdown temperature; T1, T2, and T s 3 are set reasonably, and the T control method is as follows: Step 1: Detect the hydraulic oil temperature T of the oil tank, and the controller receives the hydraulic oil temperature signal, and compares it with the temperature T1, T2, T s comparison; If the measured temperature T is lower than the lower limit T1 of the hydraulic oil temperature control, step 2 is performed; If the temperature T is increasing, and the lower limit T1 is lower than the temperature T and the upper limit T2 of the oil temperature, step 3 is performed; If the temperature T is decreasing, and the lower limit T1 is lower than the temperature T and the upper limit T2 of the oil temperature, step 4 is performed; If the upper limit T2 is lower than the temperature T and the shutdown temperature T3, step 5 is performed; If the shutdown temperature T3 is lower than the temperature T, step 6 is performed; In the time period t0-t1, the measured temperature T is lower than the lower limit T1 of the hydraulic oil temperature control, the electromagnetic valve (1.2) is de-energized, the ball valve (2.2) is in a fully open state, the hydraulic oil return is directly returned to the oil tank (5.1) without passing through the heat dissipation unit (4), and therefore the oil tank oil temperature T rapidly increases; In the time period t1-t2 and t3-t4, the temperature T is increasing, the lower limit T1 is lower than the temperature T and the upper limit T2 of the oil temperature, the electromagnetic valve (1.2) is energized for 1 second, the ball valve (2.2) is in a half-open state, the hydraulic oil return is partially directly returned to the oil tank (5.1) and partially passes through the heat dissipation unit (4), and therefore the oil tank oil temperature T slowly increases; In the time period t2-t3, the temperature T is decreasing, the lower limit T1 is lower than the temperature T and the upper limit T2 of the oil temperature, the electromagnetic valve (1.2) is energized, the ball valve (2.2) is in a fully closed state, the hydraulic oil return passes through the heat dissipation unit (4), and therefore the oil tank oil temperature T slowly decreases; In the time period t4-t5, the upper limit T2 is lower than the temperature T and the shutdown temperature T3, the electromagnetic valve (1.2) is energized, the ball valve (2.2) is in a fully closed state, and the hydraulic oil return passes through the heat dissipation unit (4). Step 6: In the time > t5 segment, stop temperature T3 < temperature T, system failure, the controller (1.1) immediately controls the main motor to stop; Step 7: Repeat step 1.

2. The intelligent jumbo hydraulic oil temperature control method according to claim 1, characterized in that: The control unit further comprises a damping speed regulating hole (1.4) arranged on the oil path communicated between the electromagnetic valve (1.2) and the large cavity of the execution oil cylinder (2.1), for limiting the opening and closing speed of the execution oil cylinder (2.1).

3. The intelligent jumbo hydraulic oil temperature control method according to claim 2, characterized in that: The diameter of the damping speed regulating hole is 0.6-1.0 mm.

4. The intelligent jumbo hydraulic oil temperature control method according to claim 3, characterized in that: The diameter of the damping speed regulating hole is 0.8 mm.

5. The intelligent jumbo hydraulic oil temperature control method according to claim 1, characterized in that: The electromagnetic valve (1.2) is a two-position four-way valve; the pressure reducing valve (1.3) is a constant pressure reducing valve.

6. The intelligent jumbo hydraulic oil temperature control method according to claim 1, characterized in that: The execution unit (2) further comprises a mounting plate (2.3) and a rotating plate (2.4), one end of the mounting plate (2.3) is rotatably connected with one end of the rotating plate (2.4) from the upper surface, and is rotatably connected with the ball valve (2.2) from the lower surface, the other end of the mounting plate (2.3) is rotatably connected with the rodless end of the execution oil cylinder (2.1), and the other end of the rotating plate (2.4) is rotatably connected with the rod end of the execution oil cylinder (2.1).

7. The intelligent jumbo hydraulic oil temperature control method according to claim 6, characterized in that: The execution unit (2) further comprises a lubrication point (2.5) arranged on the side surface of the mounting plate (2.3).

8. The intelligent jumbo hydraulic oil temperature control method according to claim 1, characterized in that: The heat dissipation unit (4) is a water-cooled or air-cooled radiator.

9. The intelligent jumbo hydraulic oil temperature control method according to claim 1, characterized in that: The temperature sensor (5.2) is arranged at the oil suction port of the oil tank pump.

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