CN118282130A - Cooling circulation system of electric cotton picker and control method - Google Patents

Abstract

The application discloses a cooling circulation system of an electric cotton picker and a control method, wherein the cooling circulation system of the electric cotton picker comprises a radiator, a water pump, a generator cooling system, a traveling motor cooling system, a picking head motor cooling system and a fan cooling system; the output end of the water pump is provided with a temperature sensor for detecting water temperature, when the temperature sensor detects that the water temperature is greater than a first temperature threshold T1, the fan of the radiator is started, and when the temperature sensor detects that the water temperature is less than a second temperature threshold T2, the fan of the radiator is closed. The application can better dissipate heat of a plurality of heat-generating structures of the electric cotton picker, can adjust the start and stop and the rotating speed of the radiator fan according to different heat generated under different working conditions, further adjusts the heat-dissipating power and ensures the normal operation of the whole machine.

Description

Cooling circulation system of electric cotton picker and control method

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a cooling circulation system of an electric cotton picker and a control method.

Background

With the continuous maturation and upgrading of cotton picker technology, cotton picking operation has tended to be mechanized, and the cotton picker not only can solve the problem of insufficient labor force in cotton harvesting seasons, but also can save labor cost and greatly improve cotton picking efficiency. To accommodate small plot cotton planting, two-row box cotton pickers are used for harvesting to suit such geographical environments.

The existing cotton picker equipment is driven by an engine, no precedent that the whole machine is driven by a motor exists, and the new energy automobile is provided with only a walking motor, so that the cotton picker is configured by a single motor. The inventor is directed at two rows of cotton pickers that cotton smallland planted the district developed, and walking, picking head, fan action all adopt motor drive, and in the machine operation in-process, these driving motor and motor controller can produce a large amount of heats, especially in the mode of gathering, walking, picking head, fan are all in operation, and the heat that produces is more. If the heat cannot be timely dissipated, the heat always penetrates through the system, and the whole vehicle can be adversely affected. When the temperature of an electromagnetic coil in a driving motor is too high, the output torque of the motor is limited, and the motor is seriously demagnetized to cause permanent damage of the motor; when the temperature of the motor controller is too high, the motor controller cannot work normally, and the whole vehicle cannot run normally.

The current new energy electric automobile also designs a motor cooling system when using motor drive, and the heat generated by a driving motor and a motor controller in the working process is cooled by the motor cooling system. The cooling mode connects the driving motor, the motor controller and the cooling system in series on a loop, ensures that heat generated by the motor and the controller is taken away in time, and enables the motor and the controller to continuously operate for a long time without damage. The cotton picker is also similar to the cotton picker, but compared with the cotton picker with more motors and controllers, the cooling power of each requirement is different, under the continuous harvesting working condition, the condition of over-high temperature is more easily generated, the power of the motors or the controllers is reduced, even the function is failed, the machine is further invalid and cannot work continuously, and the motors and the controllers cannot be connected by simple series circuits due to the fact that the quantity of the motors and the controllers is more.

Disclosure of Invention

The invention provides a cooling circulation system of an electric cotton picker and a control method thereof, which are used for solving the technical problem that the electric cotton picker is difficult to dissipate heat due to a plurality of heat generating structures.

According to one aspect of the invention, a cooling circulation system of an electric cotton picker is provided, which comprises a radiator, a water pump, a generator cooling system, a walking motor cooling system, a head motor cooling system and a fan cooling system; the output end of the radiator is connected with the input end of the water pump, the input end of the generator cooling system and the input end of the fan cooling system are connected in parallel with the output end of the water pump, the input ends of the walking motor cooling system and the head motor cooling system are connected in parallel with the output end of the generator cooling system, and the output ends of the walking motor cooling system, the head motor cooling system and the motor cooling system are connected in parallel with the input end of the radiator; the output end of the water pump is provided with a temperature sensor for detecting water temperature, when the temperature sensor detects that the water temperature is greater than a first temperature threshold T1, the fan of the radiator is started, and when the temperature sensor detects that the water temperature is less than a second temperature threshold T2, the fan of the radiator is closed.

Optionally, the input end and the output end of the radiator are connected in parallel with an expansion water tank, and the expansion water tank is used for accommodating the expansion amount of the cooling liquid of the cooling circulation system.

Optionally, the output end of the water pump is provided with a Y-shaped filter, and the Y-shaped filter comprises an inlet used for being connected with the output end of the water pump, an outlet used for being connected with the input end of the generator cooling system and the input end of the fan cooling system in parallel, and a sewage outlet.

Optionally, the outlet of the Y-shaped filter is provided with a ball valve to control the on-off of the cooling circulation system loop.

Optionally, the output ends of the walking motor cooling system, the head motor cooling system and the fan cooling system are respectively provided with a flow regulating valve.

Optionally, a ball valve for draining water is arranged at the output end of the generator cooling system.

Optionally, the flow regulating valve is an electric regulating valve or a hydraulic balance valve.

According to another aspect of the present invention, there is also provided a control method of a cooling circulation system of an electric cotton picker,

The method comprises the following steps:

When the cotton picker is started, the radiator fan does not work, and the temperature sensor detects the water temperature T at the output end of the water pump;

If the temperature T is greater than the first temperature threshold T1, starting the radiator to work, starting a radiator fan, wherein the initial rotation speed n=N0r/min of the fan, and the working time a=0s of the radiator fan;

After the radiator fan is started, the temperature sensor detects the temperature T once every preset time T;

if the temperature T is less than the second temperature threshold T2, the radiator fan stops rotating, n=0;

If the temperature T is less than the first temperature threshold T1 and greater than the second temperature threshold T2, the radiator speed is reduced, n=n-N2,

a＝a+t；

If the temperature T is greater than the first temperature threshold T1 and less than the third temperature threshold T3, the radiator rotating speed n is kept unchanged,

n＝n，a＝a+t；

If the temperature T is greater than the third temperature threshold T3, the radiator speed is increased, n=n+n1, a=a+t;

when the cotton picker is stopped, the radiator fan stops rotating n=0;

N0, N1, N2, T1, T2, T3 are preset values, and N1 and N2 are smaller than N0, T3 > T1 > T2.

Further, when the radiator fan on time reaches the time threshold X, the radiator fan is flipped for b seconds, and the radiator on time is cleared to a=0.

Further, the radiator fan can be manually controlled to be turned on and turned off, and the manual control priority is higher than the system setting control logic.

In summary, the present application includes at least one of the following beneficial technical effects:

According to the cooling circulation system and the control method of the electric cotton picker, the radiator, the water pump, the generator cooling system, the walking motor cooling system, the head motor cooling system and the fan cooling system are connected into a closed circulation loop through pipeline connection, the cooling circulation system can ensure that the driving motor and the controller always work under a proper temperature condition in any working condition and environment temperature through closed loop control, and the motor or the controller cannot be damaged due to high temperature phenomenon caused by continuous long-time work; can carry out better heat dissipation to a plurality of heat generating structures of electronic cotton picker, through setting up temperature sensor, the cooling circulation system of this patent can be according to the different start-stop and the rotational speed of radiator fan of heat that produce under the different operating modes, and then adjusts radiating power, ensures the normal operating of complete machine.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic diagram of an embodiment of a cooling cycle system of an electric cotton picker according to the present invention;

FIG. 2 is a schematic view of another embodiment of the cooling circulation system of the electric cotton picker of the present invention;

FIG. 3 is a logic diagram of a control method of the cooling circulation system of the cotton picker according to the present invention.

Legend description:

1. An expansion tank; 2. a water pump; 3.a temperature sensor; 4. a pressure sensor; 5. a Y-type filter; 6. a ball valve; 7. an electric control valve; 8. a heat sink; 9. an electric control valve; 10. a hydraulic balance valve.

Detailed Description

Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.

The application is described in further detail below with reference to fig. 1-3.

The embodiment of the application discloses a cooling circulation system of an electric cotton picker and a control method.

Referring to fig. 1, a cooling circulation system of the electric cotton picker comprises a radiator 8, a water pump 2, a generator cooling system, a traveling motor cooling system, a head motor cooling system and a fan cooling system; the output end of the radiator 8 is connected with the input end of the water pump 2, the input end of the generator cooling system and the input end of the fan cooling system are connected in parallel with the output end of the water pump 2, the input ends of the walking motor cooling system and the head motor cooling system are connected in parallel with the output end of the generator cooling system, and the output ends of the walking motor cooling system, the head motor cooling system and the motor cooling system are connected in parallel with the input end of the radiator 8; the output end of the water pump 2 is provided with a temperature sensor 3 for detecting water temperature, when the temperature sensor 3 detects that the water temperature is larger than a first temperature threshold T1, the fan of the radiator 8 is started, and when the temperature sensor 3 detects that the water temperature is smaller than a second temperature threshold T2, the fan of the radiator 8 is closed.

By the above scheme, the flow of the cooling liquid in the system is pushed by the water pump 2 and forms a closed loop circulation system. In this process, the output of the water pump 2 is equipped with a temperature sensor 3 for monitoring the temperature of the cooling liquid in real time. The cooling liquid output from the water pump 2 first flows to the generator cooling system and the fan cooling system, and the input ends of the two systems are connected in parallel to the output end of the water pump 2. After that, the input ends of the walking motor cooling system and the head picking motor cooling system are connected in parallel to the output end of the generator cooling system, which means that the cooling liquid can flow through the generator cooling system in turn and then flow to the cooling systems of the walking motor and the head picking motor. The cooling liquid takes away heat by absorbing the heat of these motors and control systems and then flows back to the radiator 8. The radiator 8 helps the cooling liquid to radiate heat by a fan, releasing the heat into the environment.

During this process the temperature sensor 3 continuously monitors the temperature of the coolant at the output of the water pump 2. If the temperature of the cooling liquid exceeds the set first temperature threshold T1, the fan of the radiator 8 is started to accelerate the heat radiation process. If the coolant temperature falls below the second temperature threshold T2, the radiator 8 fan will cease to operate, reducing energy consumption while avoiding excessive cooling. By adjusting the rotational speed of the fan according to the cooling requirement, the system optimizes the energy consumption, ensures the sufficient cooling effect and avoids unnecessary energy waste.

In a specific embodiment, the walking motor cooling system comprises a left walking motor, a right walking motor for walking operation, and a left running controller and a right running controller for control; the head motor cooling system comprises a left head motor, a right head motor and a left head controller and a right head controller which are used for controlling the harvesting operation; the generator cooling system comprises a generator and a generator controller; the fan cooling system comprises a fan motor and a fan controller.

The input end and the output end of the radiator 8 are connected in parallel with an expansion water tank 1, and the expansion water tank 1 is used for accommodating the expansion amount of cooling liquid of a cooling circulation system, stabilizing the pressure of the system and discharging air released by water in the heating process. When the temperature of the cooling system increases, the volume of the cooling liquid increases, and an excessive volume flows into the expansion tank 1, thereby preventing damage to the system due to an increase in pressure caused by expansion. Conversely, when the system cools down and the volume of the cooling liquid is reduced, the cooling liquid in the expansion tank 1 can flow back into the system again, so that the amount of the cooling liquid in the system is ensured to be constant all the time. The design effectively maintains the pressure stability of the system, avoids potential leakage and damage caused by temperature change, and improves the efficiency and reliability of the whole cooling system.

Referring to fig. 1, in a specific embodiment, the water pump 2 is a dc brushless water pump 2, and the rotation speed is controlled steplessly by an adjustable voltage. Referring to fig. 2, in another specific embodiment, the water pump 2 is a constant power mechanical water pump 2, and the flow rate adjustment is achieved by adding an electric control valve 9.

The water pump 2 provides power for the circulating flow of the cooling liquid in the whole cooling circulating system; the pressure, flow, lift and other parameters of the water pump 2 and the power of the radiator 8 are calculated to meet the heat radiation effect requirement of the whole system of the cotton picker. In a specific embodiment, the calculation process is as follows: the whole cotton picker is provided with five motors and five motor controllers, wherein the five motors comprise 2 running motors, 2 picking head motors, 1 fan motor and controllers corresponding to the motors, and a generator controller are required to perform heat dissipation circulation; the required cooling flow of the motor and the controller thereof is more than or equal to 8L/min, the required cooling flow of the generator controller is more than or equal to 12L/min, and the required cooling flow of the generator is more than or equal to 24L/min; therefore, the parameter flow range of the motor water pump 2 is selected to be 0-76.7L/min, and the lift is 14m. And then calculating the maximum heat dissipation power required by the motor and the controller in different working conditions, wherein the two rows of cotton pickers are respectively provided with the same type of driving motor and controller in the walking, picking head and fan. When in a field mode, the whole vehicle required power=walking motor/controller+head picking motor/controller+2+fan motor/controller+2, according to the working power and heat dissipation power curves of the motor provided by manufacturers, when the running motor climbs a slope at a full load of 30%, the single motor required power is X1KW, the single motor heat dissipation power is Y1KW, when the head picking motor works at a rated rotating speed, the single motor required power is X2KW, the single motor heat dissipation power is Y2KW, when the fan motor works at a rated rotating speed of a picking working condition, the single motor required power is X3KW, and the motor heat dissipation power is Y3KW; the working power of the five motor controllers is 1.02 times of the working power of the corresponding motors, and the heat dissipation power accounts for 2%; thus, the total working power of the generator controller pdenerator control= (P walking control 2+P adopts head control 2+P fan control) 1.02, the heat dissipation power is calculated to be Y3KW, the working power of the generator pdenerator = pdenerator control 1.04, and the heat dissipation power is calculated to be Y4KW; thus obtaining the total heat dissipation power Ptotal required by the whole machine; through the calculation, the requirement parameters of the radiator 8 of the motor cooling system are as follows: the heat dissipation power=pstock=1.1=22.64 KW, the heat dissipation flow accumulates the required flow of each branch to 60L/min, and the medium is 50% glycol coolant, so the actual heat dissipation power of the selected radiator 8 is about 22.6KW.

The output end of the water pump 2 is provided with a Y-shaped filter 5, and the Y-shaped filter 5 comprises an inlet for connecting the output end of the water pump 2, an outlet for being connected with the input end of the generator cooling system and the input end of the fan cooling system in parallel, and a sewage outlet. The Y-filter 5 functions to filter impurities in the cooling liquid; the filter screen should be cleaned and replaced periodically to keep the circuit clear. The outlet of the water pump 2 is provided with a pressure sensor 4 for monitoring, and an alarm signal is displayed on a control screen of the cab when the pressure is abnormal, so that a driver is reminded of stopping and overhauling in time.

The outlet of the Y-shaped filter 5 is provided with a ball valve 6 to control the on-off of the cooling circulation system loop. This design enables an operator to control the flow or stop of coolant in the system, thereby achieving on-off control of the cooling circulation system loop. By manually or automatically operating this ball valve 6, the flow of cooling fluid can be cut off rapidly in the event of maintenance, overhaul or system failure, leakage of cooling fluid is prevented, system components are protected, and system cleaning or replacement of impurities in the filter is facilitated.

The output ends of the walking motor cooling system, the head picking motor cooling system and the fan cooling system are respectively provided with a flow regulating valve. This design allows the system to precisely control the coolant flow rate of each cooling circuit, adjusted according to the specific cooling needs of each motor or system component. The flow regulating valve allows the system to dynamically regulate the cooling flow according to different working conditions, the load of the motor, the external temperature and other factors by increasing or decreasing the cooling liquid passing through the valve so as to ensure that each component can obtain a proper cooling effect. This not only protects the motor and other critical components from overheating, improving its performance and life, but also improves the energy efficiency of the overall cooling system, as it avoids unnecessary wastage of coolant.

In a specific embodiment, the flow regulating valve is an electrically operated regulating valve 7. In another specific embodiment, the flow regulating valve is a hydraulic balancing valve 10. Compared with the electric regulating valve 7, the hydraulic balance valve 10 can be directly and manually regulated to carry out open-loop control, and the opening degree of the hydraulic balance valve is regulated to change the through flow, so that the cost is reduced.

The output of the generator cooling system is provided with a ball valve 6 for draining water, which is located at the lowest level of the whole motor cooling circulation system. When it is necessary to maintain the generator cooling system, replace the cooling fluid or make system cleaning, the operator can drain the cooling fluid from the system by opening the ball valve 6

Referring to fig. 3, a control method of a cooling circulation system of an electric cotton picker includes the steps of:

S100, when the cotton picker is started, the fan of the radiator 8 does not work, and the temperature sensor 3 detects the water temperature T at the output end of the water pump 2.

S200, judging whether the temperature T is greater than a first temperature threshold T1.

If the temperature T is greater than the first temperature threshold T1, the process proceeds to step S300, and if the temperature T is not greater than the first temperature threshold T1, the process returns to step S200.

S300, the radiator 8 starts to work, the radiator 8 fan is started, the fan initial rotation speed n=n0r/min, and the radiator 8 fan working time a=0s.

S400, after the fan of the radiator 8 is started, the temperature sensor 3 detects the temperature T once every preset time T;

If the temperature T is less than the second temperature threshold T2, the fan of the radiator 8 stops rotating, n=0, and the process returns to step S200.

If the temperature T is smaller than the first temperature threshold T1 and larger than the second temperature threshold T2, the rotation speed of the radiator 8 is reduced, n=n-N2, and a=a+t; step S500 is entered.

If the temperature T is greater than the first temperature threshold T1 and less than the third temperature threshold T3, the rotation speed n of the radiator 8 remains unchanged, n=n, a=a+t; step S500 is entered.

If the temperature T is greater than the third temperature threshold T3, the rotation speed of the radiator 8 increases, n=n+n1, a=a+t; step S500 is entered.

S500, judging whether the cotton picker is stopped;

if the cotton picker is stopped, the radiator 8 fan stops rotating n=0;

If the cotton picker is down, the process proceeds to step S600.

S600, judging whether the working time of the fan of the radiator 8 reaches a time threshold value X;

If the fan operation time of the radiator 8 reaches the time threshold value X, the fan of the radiator 8 turns over for b seconds, the operation time of the radiator 8 is cleared to a=0, and the process returns to step S400;

if the fan operation time of the radiator 8 does not reach the time threshold X, the process returns to step S400.

Wherein N0, N1, N2, T1, T2, T3 are preset values, N1 and N2 are smaller than N0, and T3 is larger than T1 and larger than T2.

In a specific embodiment, t1=45 ℃, t2=35 ℃, t3=50 ℃, time threshold X is 20min, T is 2min, and b is 5s. When the motor is started, the radiator 8 does not work, when the temperature of a cooling outlet of the motor is detected to be greater than 45 degrees, a fan of the radiator 8 is started, the rotating speed N0r/min is initially set, when the temperature is detected to be greater than 50 degrees, N1r/min is increased every two minutes, the temperature is read every two minutes in a reciprocating manner, when the temperature is reduced to be lower than 50 degrees, and the rotating speed is kept unchanged; when the temperature is detected to be lower than 45 ℃, the rotating speed is reduced by N2r/min every two minutes, the temperature is read every two minutes in a reciprocating way until the temperature rises to 45 ℃, and the rotating speed is kept unchanged; if the temperature is detected to be lower than 35 ℃, the fan of the radiator 8 is directly turned off. The fan speed of the radiator 8 can be read and set on the screen, and the manual setting mode or the automatic mode can be switched. Because dust is larger under the cotton picker harvesting working condition, the heat radiation performance can be influenced after the dust enters the radiator 8, and the fan is reversely rotated for 5s every 20min when the cotton picker works under the cotton picking working condition. The fan of the radiator 8 can be manually controlled to rotate forward and backward and start and stop, and the manual control priority is higher than the system setting control logic. A reverse button is arranged on the screen, and the button can be clicked to control the reverse start and stop of the fan during cleaning.

The circulation cooling system has the advantages that the flow of each branch is regulated through the electric regulating valve 7, so that the cooling requirement flow of different motors and controllers can be met; the radiator 8 is used for cooling, the fan of the radiator 8 can rotate reversely, when the air suction inlet is blocked, the back blowing can be controlled, the regular back blowing can be realized during the harvesting work at ordinary times, the blocking frequency is reduced, the manual cleaning operation is reduced, and the working efficiency is improved;

a closed-loop control loop is formed by pressure feedback and temperature feedback, and PWM control signals of a motor of the radiator 8 are regulated according to pressure detection, so that the working rotation speed of the motor is changed, and the working rotation speed of the radiator 8 is regulated according to temperature feedback, so that the heat dissipation power of the motor is changed, and the motor and the controller are ensured to work at a proper temperature; the motor or the controller can be prevented from overheating, stopping working and even being damaged, and the system temperature is prevented from being too low due to overflow of heat dissipation power;

The water pump 2 is an electric drive water pump 2 with stepless speed regulation, can be set and regulated according to the flow required by the whole machine, and can be timely reset by increasing, decreasing or changing the motor or the controller;

The temperature is monitored through the temperature sensor 3 at the outlet of the water pump 2, and the rotating speed of the radiator 8 is continuously adjusted through program setting, so that the motor and the controller can be ensured to work in an optimal temperature range all the time, and the working efficiency is improved;

The radiator 8 has a reverse rotation function, can automatically and regularly blow back to clean the outer fins and the air suction surface in a harvesting mode, reduces the possibility of blockage, and reduces the times of manual cleaning; the flow of each branch can be electrically regulated and distributed at any time according to the actual heat dissipation flow, the demand can be input on the controller, the control is convenient and quick, the cooling demand flow can be directly modified when the loop is optimized or changed, and the different types of systems can be adapted. The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Cooling circulation system of electronic cotton picker, its characterized in that:

Comprises a radiator (8), a water pump (2), a generator cooling system, a traveling motor cooling system, a head picking motor cooling system and a fan cooling system;

The output end of the radiator (8) is connected with the input end of the water pump (2), the input end of the generator cooling system and the input end of the fan cooling system are connected in parallel with the output end of the water pump (2), the input ends of the walking motor cooling system and the head motor cooling system are connected in parallel with the output end of the generator cooling system, and the output ends of the walking motor cooling system, the head motor cooling system and the motor cooling system are connected in parallel with the input end of the radiator (8);

The output end of the water pump (2) is provided with a temperature sensor (3) for detecting water temperature, when the temperature sensor (3) detects that the water temperature is greater than a first temperature threshold value T1, the fan of the radiator (8) is started, and when the temperature sensor (3) detects that the water temperature is less than a second temperature threshold value T2, the fan of the radiator (8) is closed.

2. The cooling circulation system of an electric cotton picker according to claim 1 wherein:

The input end and the output end of the radiator (8) are connected with an expansion water tank (1) in parallel, the expansion water tank (1) is used for accommodating the expansion amount of cooling liquid of a cooling circulation system, stabilizing the pressure of the system and discharging air released by water in the heating process.

3. The cooling circulation system of an electric cotton picker according to claim 2 wherein:

The output end of the water pump (2) is provided with a Y-shaped filter (5), and the Y-shaped filter (5) comprises an inlet used for being connected with the output end of the water pump (2), an outlet used for being connected with the input end of the generator cooling system and the input end of the fan cooling system in parallel and a sewage outlet.

4. A cooling circulation system of an electric cotton picker according to claim 3, characterized in that:

The outlet of the Y-shaped filter (5) is provided with a ball valve (6) to control the on-off of a cooling circulation system loop.

5. The cooling circulation system of an electric cotton picker according to claim 1 wherein:

And the output ends of the walking motor cooling system, the head motor cooling system and the fan cooling system are respectively provided with a flow regulating valve.

6. The cooling circulation system of an electric cotton picker according to claim 5 wherein:

the output end of the generator cooling system is provided with a ball valve (6) for draining water.

7. The cooling circulation system of an electric cotton picker according to claim 5 wherein:

The flow regulating valve is an electric regulating valve (7) or a hydraulic balance valve (10).

8. A control method of a cooling circulation system of an electric cotton picker, for the cooling circulation system of an electric cotton picker as set forth in any one of claims 1 to 7, comprising the steps of:

when the cotton picker is started, a fan of the radiator (8) does not work, and the temperature sensor (3) detects the water temperature T at the output end of the water pump (2);

If the temperature T is greater than the first temperature threshold T1, starting the radiator (8) to work, starting a fan of the radiator (8), wherein the initial rotation speed n=N0r/min of the fan, and the working time a=0s of the fan of the radiator (8);

after a fan of the radiator (8) is started, the temperature sensor (3) detects the temperature T once every preset time T;

if the temperature T is smaller than the second temperature threshold T2, the fan of the radiator (8) stops rotating, and n=0;

if the temperature T is smaller than the first temperature threshold T1 and larger than the second temperature threshold T2, the rotating speed of the radiator (8) is reduced, n=n-N2, and a=a+t;

If the temperature T is greater than the first temperature threshold T1 and less than the third temperature threshold T3, the rotating speed n of the radiator (8) is kept unchanged, n=n, and a=a+t;

If the temperature T is greater than a third temperature threshold T3, the rotation speed of the radiator (8) is increased, n=n+N1, and a=a+t;

when the cotton picker is stopped, the fan of the radiator (8) stops rotating n=0;

N0, N1, N2, T1, T2, T3 are preset values, and N1 and N2 are smaller than N0, T3 > T1 > T2.

9. The control method of the cooling circulation system of the electric cotton picker according to claim 8, wherein:

when the fan operation time of the radiator (8) reaches the time threshold value X, the fan of the radiator (8) is turned over for b seconds, and the operation time of the radiator (8) is cleared to a=0.

10. The cooling circulation system of an electric cotton picker according to claim 8 wherein:

The fan of the radiator (8) can be manually controlled to rotate forward and backward and start and stop, and the manual control priority is higher than the system setting control logic.