A parameter-adjustable cleaning system of a combine harvester and a method for regulating the same

Abstract

The application discloses a parameter-adjustable cleaning system of a combine harvester and a regulation method thereof, and relates to the technical field of parameter-adjustable cleaning systems.The cleaning system comprises a loss rate sensor, a foreign matter content rate sensor, a processor, a fan speed regulator, a first sieve plate regulator and a second sieve plate regulator.The loss rate sensor is used to collect a loss rate, and the foreign matter content rate sensor is used to collect a foreign matter content rate.The processor is used to determine an optimal fan speed, a first optimal opening degree and a second optimal opening degree based on the loss rate and the foreign matter content rate, and is used to send a first control instruction based on the optimal fan speed, a second control instruction based on the first optimal opening degree and a third control instruction based on the second optimal opening degree.The fan speed regulator is used to work based on the first control instruction, and is used to adjust the speed of the fan to the optimal fan speed.The first sieve plate regulator is used to work based on the second control instruction, and is used to adjust the opening degree of the upper sieve to the first optimal opening degree.The second sieve plate regulator is used to work based on the third control instruction, and is used to adjust the opening degree of the lower sieve to the second optimal opening degree.The application can improve the regulation effect and reduce the harvesting loss.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of parameter-adjustable cleaning systems, in particular to a parameter-adjustable cleaning system of a combine harvester and a control method thereof. BACKGROUND

[0002] The working process of a combine harvester is generally: cutting, threshing, cleaning, and collecting. The cleaning system is an important part of the working process of the combine harvester, and its main function is to separate and screen the mixture (including grains and impurities, etc.) separated by the threshing system to improve the cleanliness and harvesting quality of the grains, which has a great influence on the harvesting quality. However, the cleaning effect of the cleaning system is greatly affected by factors such as environmental temperature, environmental humidity, crop quality, and field weed content. For example, when the grass-grain ratio is low, the impurities in the grains will increase, and the cleaning difficulty of the cleaning system will greatly increase, so the fan speed, the upper sieve opening, and the lower sieve opening need to be adjusted to minimize the harvesting loss.

[0003] However, although there are studies on the adjustment of the working parameters of the cleaning system, the adjustment effect is poor. SUMMARY

[0004] The purpose of the present application is to provide a parameter-adjustable cleaning system of a combine harvester and a control method thereof, which can improve the control effect and reduce the harvesting loss.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] In a first aspect, the present application provides a parameter-adjustable cleaning system of a combine harvester, which comprises: a loss rate sensor, a foreign matter content rate sensor, a processor, a fan speed regulator, a first sieve piece regulator, and a second sieve piece regulator.

[0007] The loss rate sensor is used to detect the impurities obtained after the cleaning by the parameter-adjustable cleaning system, and obtain the loss rate.

[0008] The foreign matter content rate sensor is used to detect the grains obtained after the cleaning by the parameter-adjustable cleaning system, and obtain the foreign matter content rate.

[0009] The processor is used to determine the optimal fan speed, the first optimal opening, and the second optimal opening based on the loss rate and the foreign matter content rate, and send a first control instruction based on the optimal fan speed, a second control instruction based on the first optimal opening, and a third control instruction based on the second optimal opening.

[0010] The fan speed regulator is connected with the fan driver, and the fan speed regulator is used to work based on the first control instruction to adjust the speed of the fan to the optimal fan speed.

[0011] The first sieve piece adjuster is connected with the upper sieve drive, and is used to adjust the opening of the upper sieve to the first optimal opening based on the second control instruction.

[0012] The second sieve piece adjuster is connected with the lower sieve drive, and is used to adjust the opening of the lower sieve to the second optimal opening based on the third control instruction.

[0013] In a second aspect, the application provides a control method of the parameter-adjustable cleaning system of the combine harvester, which is applied to the parameter-adjustable cleaning system of the combine harvester and includes the following steps:

[0014] The optimal fan rotating speed, the first optimal opening and the second optimal opening are determined based on the loss rate and the impurity rate.

[0015] The first control instruction is sent based on the optimal fan rotating speed, so as to drive the fan rotating speed adjuster to work and adjust the rotating speed of the fan to the optimal fan rotating speed.

[0016] The second control instruction is sent based on the first optimal opening, so as to drive the first sieve piece adjuster to work and adjust the opening of the upper sieve to the first optimal opening.

[0017] The third control instruction is sent based on the second optimal opening, so as to drive the second sieve piece adjuster to work and adjust the opening of the lower sieve to the second optimal opening.

[0018] According to the specific embodiments provided by the application, the application has the following technical effects:

[0019] The application provides a parameter-adjustable cleaning system of a combine harvester and a control method thereof. The loss rate sensor collects the loss rate, the impurity rate sensor collects the impurity rate, the processor determines the optimal fan rotating speed, the first optimal opening and the second optimal opening based on the loss rate and the impurity rate, sends the first control instruction based on the optimal fan rotating speed, sends the second control instruction based on the first optimal opening, and sends the third control instruction based on the second optimal opening. The fan rotating speed adjuster works based on the first control instruction, adjusts the rotating speed of the fan to the optimal fan rotating speed, the first sieve piece adjuster works based on the second control instruction, adjusts the opening of the upper sieve to the first optimal opening, and the second sieve piece adjuster works based on the third control instruction, adjusts the opening of the lower sieve to the second optimal opening. The application determines the optimal fan rotating speed, the first optimal opening and the second optimal opening based on the loss rate and the impurity rate, and then drives the fan, the upper sieve and the lower sieve to work based on the fan rotating speed adjuster, the first sieve piece adjuster and the second sieve piece adjuster, so that the fan, the upper sieve and the lower sieve work according to the optimal working parameters, thereby improving the control effect and reducing the harvesting loss. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 A structure schematic diagram of a parameter-adjustable cleaning system of a combine harvester provided in Embodiment 1 of the present application.

[0022] Figure 2 A structure schematic diagram of a fan speed regulator provided in Embodiment 1 of the present application.

[0023] Figure 3 A structure schematic diagram of a driven belt disc provided in Embodiment 1 of the present application.

[0024] Figure 4 A structure schematic diagram of an opening-adjustable cleaning screen provided in Embodiment 1 of the present application.

[0025] Figure 5 A structure schematic diagram of a screen sheet regulator provided in Embodiment 1 of the present application.

[0026] Figure 6 A construction schematic diagram of a data set provided in Embodiment 1 of the present application.

[0027] Figure 7 A flow schematic diagram of a working parameter optimization step provided in Embodiment 1 of the present application.

[0028] Figure 8 A flow schematic diagram of a fan speed closed-loop control step provided in Embodiment 1 of the present application.

[0029] Figure 9 A flow schematic diagram of a screen sheet opening closed-loop control step provided in Embodiment 1 of the present application.

[0030] Figure 10 A flow schematic diagram of a parameter-adjustable cleaning system of a combine harvester provided in Embodiment 2 of the present application.

[0031] Figure 11 A structure schematic diagram of a computer device provided in Embodiment 3 of the present application.

[0032] Reference signs:

[0033] 100: fan; 200: fan speed regulator; 300: lower sieve; 400: sieve frame; 500: upper sieve; 600: loss rate sensor; 700: machine frame; 800: second elevator; 900: impurity content sensor; 1000: first elevator; 1100: conveying disc; 201: driven pulley; 202: belt; 203: second fixed pulley; 204: tension pulley; 205: first fixed pulley; 206: tension pulley support; 207: driving pulley; 208: connecting piece; 209: first spring; 210: first connecting rod; 211: push rod motor; 201-1: bolt; 201-2: A disc; 201-3: B disc; 201-4: first guide block; 201-5: second spring; 201-6: second guide block; 201-7: washer; 201-8: nut; 201-9: split pin; 301: blade; 302: fixed frame; 303: moving frame; 304: second connecting rod; 305: coupling; 306: sieve sheet regulator; 307: fixed support; 306-1: housing; 306-2: screw shaft; 306-3: support; 306-4: first gear; 306-5: retainer ring; 306-6: second gear; 306-7: first shaft; 306-8: limit ring; 306-9: hand wheel; 306-10: second shaft; 306-11: motor; 306-12: motor support; 306-13: sixth gear; 306-14: controller; 306-15: fifth gear; 306-16: fourth gear; 306-17: third gear; 306-18: sliding block. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Embodiment 1

[0036] To realize that the working parameters of the cleaning system of the combine harvester can be automatically adjusted according to the working state (loss rate and impurity content), the present embodiment designs a parameter-adjustable cleaning system, in which a loss rate sensor, an impurity content sensor, a fan speed regulator (also referred to as a fan speed regulating mechanism) capable of closed-loop adjustment, a first sieve sheet regulator (also referred to as an upper sieve opening adjusting mechanism) capable of closed-loop adjustment, and a second sieve sheet regulator (also referred to as a lower sieve opening adjusting mechanism) capable of closed-loop adjustment are additionally provided.

[0037] As Figure 1As shown, the cleaning system comprises: a fan 100, a lower sieve 300, a sieve frame 400, an upper sieve 500, a rack 700, a second elevator 800, a first elevator 1000 and a conveying disc 1100, the fan 100 is fixedly installed on the rack 700 through a bearing, the lower sieve 300 is installed on the sieve frame 400, the sieve frame 400 is installed on the rack 700, the upper sieve 500 is installed on the sieve frame 400, the second elevator 800 is installed on the rack 700, the first elevator 1000 is installed on the rack 700, the conveying disc 1100 is installed on the rack 700, the mixture separated by the threshing system is conveyed to the upper sieve 500 through the conveying disc 1100, after screening through the upper sieve 500, most of the grains fall into the lower sieve 300, a small amount of grains and impurities remain in the upper sieve 500, after screening through the lower sieve 300, most of the grains fall into the first elevator 1000, the first elevator 1000 transports the grains to the granary, a small amount of grains and impurities remain in the lower sieve 300, the impurities and a small amount of grains on the upper sieve 500 and the lower sieve 300 fall into the second elevator 800, the second elevator 800 transports the impurities and a small amount of grains to the conveying disc 1100 for next screening, in the process of screening through the upper sieve 500 and the lower sieve 300, the fan 100 generates airflow to blow away the impurities falling to the ground.

[0038] In view of the fact that too high speed of the fan 100 will cause the grains to be blown out by mistake, increasing the loss rate, too low speed will not effectively separate the impurities, increasing the impurity rate, too large or too small opening of the sieve will affect the cleaning effect, too large opening will cause the impurities to mix into the grains, increasing the impurity rate, too small opening will cause the mixture to accumulate, incomplete cleaning, increasing the loss rate, therefore, the embodiment increases the loss rate sensor 600, the impurity rate sensor 900, the fan speed regulator 200, the first sieve regulator and the second sieve regulator in the cleaning system, the loss rate sensor 600 is installed on the rack 700, used for detecting the impurities falling on the ground, obtaining the loss rate, the loss rate is the percentage of the mass of the separated impurities in the parameter adjustable cleaning system to the mass of all the grains, for example, when the loss rate is 1%, it means that 99% of the grains enter the granary, and 1% of the grains are removed with the impurities, the impurity rate sensor 900 is installed on the first elevator 1000, used for detecting the grains in the first elevator 1000, obtaining the impurity rate, the impurity rate is the percentage of the mass of the impurities entering the granary to the mass of the grains in the harvested grains, for example, a 100g sample is taken from the granary, 95g of which is grain and 5g of which is impurity, so the impurity rate is 5%, the fan speed regulator 200 is installed on the rack 700, one end of the fan speed regulator 200 is connected with the engine, and the other end is connected with the fan 100, used for driving the fan 100 to rotate, changing the speed of the fan 100, the first sieve regulator is installed on the rack 700, used for driving the upper sieve 500 to work, changing the opening of the upper sieve 500, and the second sieve regulator is installed on the rack 700, used for driving the lower sieve 300 to work, changing the opening of the lower sieve 300.

[0039] Based on this, the embodiment provides a parameter adjustable cleaning system of a combine harvester, which comprises a loss rate sensor 600, an impurity rate sensor 900, a processor, a fan speed regulator 200, a first sieve regulator and a second sieve regulator.

[0040] The loss rate sensor 600 is used for detecting the impurities obtained after cleaning by the parameter adjustable cleaning system, obtaining the loss rate.

[0041] The impurity rate sensor 900 is used for detecting the grains obtained after cleaning by the parameter adjustable cleaning system, obtaining the impurity rate.

[0042] The processor is used for determining the optimal fan speed, the first optimal opening and the second optimal opening based on the loss rate and the impurity rate, and issuing a first control instruction based on the optimal fan speed, a second control instruction based on the first optimal opening and a third control instruction based on the second optimal opening.

[0043] The fan speed regulator 200 is drivingly connected with the fan 100, and is configured to adjust the speed of the fan 100 to an optimal fan speed based on the first control instruction.

[0044] The first sieve regulator is drivingly connected with the upper sieve 500, and is configured to adjust the opening of the upper sieve 500 to a first optimal opening based on the second control instruction.

[0045] The second sieve regulator is drivingly connected with the lower sieve 300, and is configured to adjust the opening of the lower sieve 300 to a second optimal opening based on the third control instruction.

[0046] The embodiment provides a parameter-adjustable cleaning system, which can determine the optimal fan speed, the first optimal opening and the second optimal opening based on the loss rate and the impurity rate, and drive the fan 100 to work at the optimal fan speed by the fan speed regulator 200, drive the upper sieve 500 to work at the first optimal opening by the first sieve regulator, and drive the lower sieve 300 to work at the second optimal opening by the second sieve regulator, so that the fan 100, the upper sieve 500 and the lower sieve 300 can all work at the optimal working parameters, the cleaning process with low loss and low impurity rate is realized, the regulation and control effect of the cleaning system is improved, and the harvesting loss is reduced.

[0047] In order to realize the adjustment of the fan speed, the embodiment designs a fan speed regulator 200, as shown in Figure 2As shown, the fan speed regulator 200 comprises a driven pulley 201, a belt 202, a second fixed pulley 203, a tension pulley 204, a first fixed pulley 205, a tension pulley support 206, a driving pulley 207, a connecting piece 208, a first spring 209, a first connecting rod 210 and a push rod motor 211. The driven pulley 201 is fixedly connected with the main shaft of the fan 100, the second fixed pulley 203 is fixedly connected with the main shaft of the first elevator 1000, the first fixed pulley 205 rotates around the fixed shaft on the rack 700, the driving pulley 207 is fixedly connected with the output shaft of the engine, the driven pulley 201, the second fixed pulley 203, the tension pulley 204 and the driving pulley 207 are all located inside the belt 202, the first fixed pulley 205 is located outside the belt 202, the engine drives the driving pulley 207 to rotate around the axis of the driving pulley 207, the driving pulley 207 drives the belt 202 to rotate, the belt 202 drives the driven pulley 201 to rotate around the axis of the driven pulley 201, drives the second fixed pulley 203 to rotate around the axis of the second fixed pulley 203, drives the tension pulley 204 to rotate around the axis of the tension pulley 204 and drives the first fixed pulley 205 to rotate around the axis of the first fixed pulley 205, the driven pulley 201 drives the fan 100 to rotate, the second fixed pulley 203 drives the main shaft of the first elevator 1000 to rotate, provides power for the first elevator 1000, so that the first elevator 1000 operates to transport the grains to the granary.

[0048] The tension pulley support 206 is fixedly connected with the rotation axis of the tension pulley 204, is rotationally connected with the rotation axis of the first fixed pulley 205 and is fixedly connected with the connecting piece 208. The connecting piece 208 is fixedly connected with the first connecting rod 210 through the first spring 209, the first connecting rod 210 is hingedly connected with the push rod motor 211. When the push rod motor 211 extends or retracts, the tension pulley 204 and the tension pulley support 206 rotate around the axis of the first fixed pulley 205. Since the tension pulley 204 is located inside the belt 202 and the first fixed pulley 205 is located outside the belt 202, the rotation of the tension pulley 204 around the axis of the first fixed pulley 205 can tighten or loosen the belt 202. The first spring 209 has the following functions: when the belt system (i.e. the driven pulley 201, the belt 202, the second fixed pulley 203, the tension pulley 204, the first fixed pulley 205 and the driving pulley 207) does not rotate, it has a protection function; when the belt system rotates, it has a buffering function.

[0049] In order to change the rotating speed of the fan 100 by tightening or loosening the belt 202, the structure of the driven pulley 201 is further designed in this embodiment, as shown in Figure 3As shown, the driven belt disc 201 comprises a bolt 201-1, an A disc 201-2, a B disc 201-3, a first guide block 201-4, a second spring 201-5, a second guide block 201-6, a washer 201-7, a nut 201-8 and a split pin 201-9, the A disc 201-2 has a hollow sleeve in the center, which is sleeved on the main shaft of the fan 100 and fixedly connected with the main shaft of the fan 100, the B disc 201-3 is sleeved on the hollow sleeve of the A disc 201-2, the A disc 201-2 and the B disc 201-3 are connected through the bolt 201-1, so that the opposite surfaces of the A disc 201-2 and the B disc 201-3 are in close contact, and the opposite surfaces of the A disc 201-2 and the B disc 201-3 are both inclined surfaces, so that the distance between the A disc 201-2 and the B disc 201-3 is smaller near the hollow sleeve, the belt 202 is sleeved between the A disc 201-2 and the B disc 201-3, when the distance between the A disc 201-2 and the B disc 201-3 changes, the position of the belt 202 between the A disc 201-2 and the B disc 201-3 also changes, specifically when the distance between the A disc 201-2 and the B disc 201-3 increases, the belt 202 moves inward, the equivalent diameter of the driven belt disc 201 decreases, since the linear speed of the belt 202 is constant, the rotating speed of the driven belt disc 201 increases, and the rotating speed of the fan 100 increases accordingly, when the distance between the A disc 201-2 and the B disc 201-3 decreases, the belt 202 moves outward, the equivalent diameter of the driven belt disc 201 increases, since the linear speed of the belt 202 is constant, the rotating speed of the driven belt disc 201 decreases, and the rotating speed of the fan 100 decreases accordingly, it should be noted that moving inward means moving close to the hollow sleeve, and moving outward means moving away from the hollow sleeve. The second spring 201-5 is sleeved on the threaded segment of the bolt 201-1 after the bolt 201-1 passes through the B disc 201-3, the two ends of the second spring 201-5 are fixed through the first guide block 201-4 and the second guide block 201-6, the first guide block 201-4 and the second guide block 201-6 are also sleeved on the bolt 201-1, the washer 201-7 and the nut 201-8 are also sleeved on the bolt 201-1, the nut 201-8 is pressed, and then the split pin 201-9 is used to lock the bolt 201-1 and the nut 201-8.

[0050] The principle of the fan speed regulator 200 of the embodiment for regulating the speed of the fan 100 is as follows: the push rod motor 211 is actuated to pull the tension pulley 204 to move upward, the belt 202 is tensioned, the pressure of the driven pulley 201 is increased, under the action of the second spring 201-5, since the A disc 201-2 of the driven pulley 201 is fixed, under the condition of increased pressure, the B disc 201-3 moves rightward, the second spring 201-5 is compressed, until the pressure balance, since the B disc 201-3 moves rightward, the distance between the A disc 201-2 and the B disc 201-3 is increased, the belt 202 moves inward, the equivalent diameter of the driven pulley 201 is reduced, under the condition that the linear speed of the belt 202 is unchanged, the speed of the driven pulley 201 is increased, the speed of the fan 100 is increased, and vice versa.

[0051] Based on this, in the embodiment, the fan speed regulator 200 comprises the belt 202, the driving pulley 207, the driven pulley 201, the tension pulley 204, the first fixed pulley 205, the tension pulley support 206 and the driving component.

[0052] The driving pulley 207, the driven pulley 201 and the tension pulley 204 are located inside the belt 202, the first fixed pulley 205 is located outside the belt 202, the driving pulley 207 is drivingly connected with the engine, the driven pulley 201 is drivingly connected with the fan 100, the first fixed pulley 205 rotates around the fixed shaft on the rack 700, when the engine drives the driving pulley 207 to rotate, the driving pulley 207 drives the belt 202 to rotate, the belt 202 drives the driven pulley 201, the tension pulley 204 and the first fixed pulley 205 to rotate, and the driven pulley 201 drives the fan 100 to rotate.

[0053] The tension pulley support 206 is connected with the tension pulley 204, the first fixed pulley 205 and the driving component respectively, when the driving component is extended or retracted, the tension pulley support 206 and the tension pulley 204 are driven to rotate around the axis of the first fixed pulley 205, so that the belt 202 is tensioned or relaxed, the equivalent diameter of the driven pulley 201 is changed, and the speed of the fan 100 is changed.

[0054] In the embodiment, the fan rotating speed regulator 200 further comprises a second fixed pulley 203 located inside the belt 202, and the second fixed pulley 203 is drivingly connected with the first elevator 1000. When the engine drives the driving pulley 207 to rotate, the driving pulley 207 drives the belt 202 to rotate, and the belt 202 further drives the second fixed pulley 203 to rotate, and the second fixed pulley 203 drives the first elevator 1000 to operate, thereby transporting the grain obtained after the parameter-adjustable cleaning system to the granary.

[0055] The driving component comprises a push rod motor 211, a first connecting rod 210, a first spring 209 and a connecting piece 208. The push rod motor 211 is connected with a first end of the first connecting rod 210. A second end of the first connecting rod 210 is connected with a first end of the first spring 209. A second end of the first spring 209 is connected with a first end of the connecting piece 208. A second end of the connecting piece 208 is connected with the tension pulley bracket 206.

[0056] The driven pulley 201 comprises an A pulley 201-2, a B pulley 201-3, a bolt 201-1, a first guide block 201-4, a second spring 201-5, a second guide block 201-6, a washer 201-7, a nut 201-8 and a split pin 201-9. The A pulley 201-2 has a hollow sleeve in the center, the hollow sleeve is fixedly sleeved on the main shaft of the fan 100, the B pulley 201-3 is sleeved on the hollow sleeve, the opposite surfaces of the A pulley 201-2 and the B pulley 201-3 are inclined surfaces, the bolt 201-1 passes through the A pulley 201-2, the B pulley 201-3, the first guide block 201-4, the second spring 201-5, the second guide block 201-6, the washer 201-7 and the nut 201-8 in sequence, the bolt 201-1 is threadedly connected with the nut 201-8, the A pulley 201-2, the B pulley 201-3, the first guide block 201-4, the second spring 201-5, the second guide block 201-6 and the washer 201-7 are clamped by the bolt 201-1 and the nut 201-8, and the bolt 201-1 and the nut 201-8 are locked by the split pin 201-9. The belt 202 is sleeved between the A pulley 201-2 and the B pulley 201-3. When the belt 202 is tightened, the spacing between the A pulley 201-2 and the B pulley 201-3 is increased, the equivalent diameter of the driven pulley 201 is reduced, and the rotating speed of the fan 100 is increased. When the belt 202 is loosened, the spacing between the A pulley 201-2 and the B pulley 201-3 is reduced, the equivalent diameter of the driven pulley 201 is increased, and the rotating speed of the fan 100 is reduced.

[0057] In order to adjust the opening degree of the upper screen 500 and the lower screen 300, the embodiment designs an opening-adjustable cleaning screen, such as Figure 4As shown, the opening-adjustable cleaning screen comprises blades 301, a fixed frame 302, a moving frame 303, a second connecting rod 304, a coupling 305, a screen piece adjuster 306 and a fixed support 307. The blades 301 can rotate around the fixed shaft on the fixed frame 302, and specifically, the blades 301 are pushed to rotate around the fixed shaft by the push rod on the moving frame 303 to achieve the purpose of adjusting the opening. The first end of the second connecting rod 304 is hinged to the moving frame 303, the second end of the second connecting rod 304 is connected to the first end of the coupling 305, the second end of the coupling 305 is connected to the screen piece adjuster 306, the screen piece adjuster 306 is installed on the screen frame 400 through the fixed support 307, the second connecting rod 304 is moved by the screen piece adjuster 306, the moving frame 303 is moved by the second connecting rod 304, and the blades 301 are rotated around the fixed frame 302 by the moving frame 303 to adjust the opening.

[0058] As Figure 5As shown, the screen regulator 306 comprises a housing 306-1, a screw shaft 306-2, a support 306-3, a first gear 306-4, a stop ring 306-5, a second gear 306-6, a first shaft 306-7, a limiting ring 306-8, a hand wheel 306-9, a second shaft 306-10, a motor 306-11, a motor support 306-12, a sixth gear 306-13, a controller 306-14, a fifth gear 306-15, a fourth gear 306-16, a third gear 306-17 and a sliding block 306-18, the screw shaft 306-2 passes through the housing 306-1 at both ends, the sliding block 306-18 is arranged between the screw shaft 306-2 and the housing 306-1, the both ends of the screw shaft 306-2 are hexagonal and can move linearly in the sliding block 306-18 and cannot rotate, the middle part of the screw shaft 306-2 is a screw rod, the first gear 306-4 has a thread inside and is equivalent to a nut, the first gear 306-4 is sleeved on the screw rod, when the first gear 306-4 rotates, the first gear 306-4 cannot move up and down along the axis of the screw shaft 306-2 due to the blocking of the stop ring 306-5 and the support 306-3 at both ends of the first gear 306-4, so the screw shaft 306-2 moves up and down under the action of the nut, drives the second connecting rod 304 to move left and right, and further drives the blade 301 to rotate around the fixed frame 302.The first shaft 306-7 is installed on the hole of the shell 306-1 and is fixed by the limiting ring 306-8 to prevent the first shaft 306-7 from moving up and down along the axis, the second gear 306-6 and the third gear 306-17 are fixed on the first shaft 306-7, the second gear 306-6 is engaged with the first gear 306-4, the second shaft 306-10 is installed in the hole of the shell 306-1 and is fixed by the limiting ring 306-8 to prevent the second shaft 306-10 from moving up and down along the axis, the hand wheel 306-9, the fourth gear 306-16 and the fifth gear 306-15 are fixed on the second shaft 306-10, the fourth gear 306-16 is engaged with the third gear 306-17, the motor 306-11 is installed in the shell 306-1 through the motor support 306-12, the sixth gear 306-13 is fixedly connected to the output shaft of the motor 306-11 and is engaged with the fifth gear 306-15, the controller 306-14 is fixed in the shell 306-1, the controller 306-14 is used to drive the motor 306-11 to rotate, the motor 306-11 drives the sixth gear 306-13 to rotate, the sixth gear 306-13 drives the fifth gear 306-15 to rotate, the fifth gear 306-15 drives the second shaft 306-10 to rotate, the second shaft 306-10 drives the fourth gear 306-16 to rotate, the fourth gear 306-16 drives the third gear 306-17 to rotate, the third gear 306-17 drives the first shaft 306-7 to rotate, the first shaft 306-7 drives the second gear 306-6 to rotate, the second gear 306-6 drives the first gear 306-4 to rotate, and the first gear 306-4 drives the lead screw shaft 306-2 to move up and down. When the motor 306-11 is damaged, the hand wheel 306-9 can be used to manually drive the second shaft 306-10 to rotate, further driving the lead screw shaft 306-2 to move up and down to adjust the opening degree.

[0059] The motor 306-11 has an absolute value encoder at the tail, which can measure the position of the rotating shaft of the motor 306-11 to obtain the actual position of the motor 306-11.

[0060] At this time, in the embodiment, the structures of the upper sieve 500 and the lower sieve 300 are the same, the upper sieve 500 comprises a fixed frame 302, a moving frame 303 and a plurality of blades 301, a plurality of fixed shafts are arranged on the fixed frame 302, the fixed shafts correspond to the blades 301 one by one, a plurality of push rods are arranged on the moving frame 303, the push rods correspond to the blades 301 one by one, when the moving frame 303 moves, the push rods push the blades 301 to rotate around the fixed shafts to change the opening degree of the upper sieve 500.

[0061] The first screen sheet adjuster and the second screen sheet adjuster are the same in structure, and the first screen sheet adjuster comprises a housing 306-1, a screw shaft 306-2, a first shaft 306-7, a second shaft 306-10 and a motor 306-11, the screw shaft 306-2, the first shaft 306-7, the second shaft 306-10 and the motor 306-11 are all located in the housing 306-1, and both ends of the screw shaft 306-2 extend out of the housing 306-1, one end of the screw shaft 306-2 is connected with the moving frame 303, specifically connected with the moving frame 303 through the coupling 305 and the second connecting rod 304, to drive the moving frame 303 to move, and adjust the opening degree of the upper screen 500.

[0062] Both ends of the screw shaft 306-2 are regular hexagons, and a first limiting block is sleeved on each end of the screw shaft 306-2, the first limiting block is located between the screw shaft 306-2 and the housing 306-1, and is used for limiting the rotation of the screw shaft 306-2, the middle part of the screw shaft 306-2 is a screw rod, a first gear 306-4 and a second limiting block are sleeved on the screw rod, the inside of the first gear 306-4 is thread-shaped, so that the first gear 306-4 is threadedly connected with the screw rod, and the second limiting block is used for limiting the up-down movement of the first gear 306-4 along the screw rod.

[0063] The first shaft 306-7 is provided with a second gear 306-6 and a third gear 306-17, and the second gear 306-6 is in meshing connection with the first gear 306-4.

[0064] The second shaft 306-10 is provided with a fourth gear 306-16, a fifth gear 306-15 and a hand wheel 306-9, the fourth gear 306-16 is in meshing connection with the third gear 306-17, and the hand wheel 306-9 is used for driving the second shaft 306-10 to rotate.

[0065] The output shaft of the motor 306-11 is provided with a sixth gear 306-13, and the sixth gear 306-13 is in meshing connection with the fifth gear 306-15.

[0066] The first limiting block is a sliding block 306-18, the second limiting block comprises a support 306-3 and a blocking ring 306-5 located on both sides of the first gear 306-4, the support 306-3 is fixedly installed on the housing 306-1, and the blocking ring 306-5 is located between the support 306-3 and the first gear 306-4.

[0067] The first screen sheet adjuster further comprises a limiting ring 306-8 located at both ends of the first shaft 306-7 and both ends of the second shaft 306-10, respectively, and the limiting ring 306-8 is used for limiting the up-down movement of the first shaft 306-7 and the up-down movement of the second shaft 306-10.

[0068] The first sieve sheet adjuster further comprises a motor support 306-12 mounted in the housing 306-1, and the motor 306-11 is mounted on the motor support 306-12, and the motor 306-11 is a stepping motor.

[0069] Based on the above parameter-adjustable cleaning system, the embodiment further provides a regulation and control method of the low-loss low-impurity parameter-adjustable cleaning system, comprising: a working parameter optimization step of the fan 100, the upper sieve 500 and the lower sieve 300 according to the loss rate and the impurity rate, a fan speed closed-loop regulation step, an upper sieve opening closed-loop regulation step and a lower sieve opening closed-loop regulation step.

[0070] (1) The working parameter optimization step of the fan 100, the upper sieve 500 and the lower sieve 300 according to the loss rate and the impurity rate.

[0071] Step 1: Construct a data collection parameter table, according to the 3-factor 3-level orthogonal table design rule, assuming that the fan speed regulation range is 1000-1200, the unit is r / min, the upper sieve opening regulation range is 10-30, the unit is degree, and the lower sieve opening regulation range is 10-30, the unit is degree, and the corresponding data collection parameter table (i.e. a plurality of value combinations) is designed, as shown in Table 1.

[0072] Table 1 Data collection parameter table

[0073]

[0074]

[0075] Step 2: as shown in Figure 6 , according to the data collection parameter table generated in step 1, according to the row-by-row execution principle, the fan speed F, the upper sieve opening C and the lower sieve opening S of the parameter-adjustable cleaning system of the combine harvester are adjusted to the corresponding working parameters in turn, after running for 10 seconds, the loss rate L and the impurity rate Z are collected, and the evaluation result R is further calculated, the evaluation result R = -(α*L+(1-α)*Z), α is the weight coefficient. For example, row number k = 1, weight coefficient α = 0.5, fan speed F = 1000, upper sieve opening C = 10, and lower sieve opening S = 10, after running for 10 seconds, the loss rate L = 2.1 and the impurity rate Z = 3.8 are collected, then R = -1*(2.1*0.5+3.8*0.5) = -2.95, and the data A k ={1000, 10, 10, -2.95} is added to the data set A, if k < 9, k increases by 1, otherwise, step 2 is ended, and the data set A is constructed.

[0076] Step 3: as shown in Figure 7As shown, using the data set A created in step 2, a surrogate model of the Bayesian optimization algorithm is built, and then the optimal parameter point (i.e. the optimal combination of values) containing three parameters (F, C, S) is obtained using the expected improvement method of the Bayesian optimization algorithm, and the parameter point is sent to the processor to adjust the fan speed F, the upper sieve opening C, and the lower sieve opening S of the combined harvester parameter adjustable cleaning system to the corresponding working parameters. After running for 10 seconds, the loss rate L and the impurity rate Z are obtained, then the evaluation result R is calculated, and the data {F, C, S, R} is added to the data set A, then it is judged whether the absolute value of the evaluation result R of the optimal parameter point is less than the preset value. If yes, the optimization process is ended, and the best working parameters are determined based on the optimal parameter point. If not, step 3 is repeated again.

[0077] Step 3 specifically includes:

[0078] Step 3.1: A Gaussian process is trained to build a surrogate model GP through the pre-prepared data set A. For a random process, a surrogate model is fitted through the data set A, and the distribution of the dependent variable can be obtained by inputting the independent variable. For a Gaussian process, the distribution of the dependent variable is represented by a Gaussian distribution, which includes the mean and the standard deviation. The mean represents the value with the highest probability of the dependent variable, and the standard deviation represents the uncertainty of the result. The independent variable is the parameter point (F, C, S), and the dependent variable is the evaluation result R. Through the surrogate model, the mean and the standard deviation of any parameter point in the (F, C, S) coordinate space can be determined. For example, the following can be obtained:

[0079] To be selected parameter point 1: mean μ(1000, 10, 10) = -3, standard deviation σ(1000, 10, 10) = 1

[0080] To be selected parameter point 2: mean μ(1200, 30, 20) = -2, standard deviation σ(1200, 30, 20) = 0.5

[0081] Step 3.2: The EI (Expected Improvement, expected improvement) of the to-be-selected parameter point is calculated by the expected improvement method of the Bayesian optimization algorithm, and the calculation formula is as follows:

[0082]

[0083] Wherein, EI is the expected improvement, the greater the EI value, the greater the possibility that the to-be-selected parameter point is the optimal parameter point; μ is the mean of the to-be-selected parameter point; R max is the maximum R value in the data set A; γ is the exploration parameter, the greater the γ value, the greater the exploration distance; σ is the standard deviation of the to-be-selected parameter point; x is the variable.

[0084] The parameter point to be selected under the current agent model can maximize the evaluation result, i.e. the optimal parameter point, is calculated by the EI function.

[0085] Suppose the fan speed regulation range is 1000-1200, the upper screen opening regulation range is 10-30, and the lower screen opening regulation range is 10-30. Through the equal interval sampling method, the fan speed takes several values, such as (1000, 1020, 1040, 1060, 1080, 1100, 1120, 1140, 2160, 1180, 1200). Similarly, the upper screen opening and the lower screen opening also take several values. Suppose they are both 11, then there are 11 3 combinations, which are classified into set B={F, C, S}. Then, the EI value of each value (i.e. the parameter point to be selected) in set B is calculated.

[0086] For example, the parameter point to be selected (1020, 12, 12) can be calculated as:

[0087] μ(1020, 12, 12)=-3;

[0088] σ(1020, 12, 12)=1;

[0089] R max =-2.5;

[0090] γ=0.01;

[0091]

[0092] Then, the data {F, C, S, EI} are added to set C={F, C, S, EI}. After the above operation ends, the parameter point to be selected with the largest EI value is selected from set C as the optimized result, i.e. the optimal parameter point. Suppose the EI in set C reaches the maximum value 6 when the fan speed F=1100, the upper screen opening C=16, and the lower screen opening S=13, then the fan speed F=1100, the upper screen opening C=16, and the lower screen opening S=13 are selected as the optimal parameter point, which is used as the execution parameter for the next adjustment.

[0093] Step 3.3: Set the fan speed F = 1100, the upper screen opening C = 16, and the lower screen opening S = 13 as target values, write them into the processor, adjust the relevant mechanisms to the target positions, run for 10 seconds, obtain the loss rate L = 2.1, the impurity rate Z = 3.8, and R = -(2.1 * 0.5 + 3.8 * 0.5) = -2.95, then add the data {1100, 16, 13, -2.95} to the data set A. Determine whether the absolute value of R at this time, 2.95, is less than the preset value. If it is, it means that the adjustment effect meets the job requirements, and the optimization stops. Otherwise, repeat the above process until the absolute value of R is less than the preset value.

[0094] (2) Fan speed closed-loop control step.

[0095] As shown in Figure 8 , the fan speed closed-loop control step is as follows:

[0096] Step 1: Determine whether the actual fan speed is greater than 50 revolutions. If it is, execute Step 2. If not, end.

[0097] Step 2: Input the difference between the set value of the fan speed (i.e., the optimal fan speed) and the measured value (i.e., the actual fan speed) into the fan speed adjustment PID, calculate the target position of the push rod motor 211, and then execute Step 3.

[0098] Step 3: Input the difference between the target position of the push rod motor 211 and the actual position into the push rod position adjustment PID, and control the push rod motor 211 to rotate. The push rod motor 211 drives the belt system to act, achieving fan speed adjustment.

[0099] (3) Screen piece opening closed-loop control step.

[0100] Both the upper screen piece opening closed-loop control step and the lower screen piece opening closed-loop control step use this screen piece opening closed-loop control step. As shown in Figure 9 , the screen piece opening closed-loop control step is as follows:

[0101] Step 1: Obtain the current position of the motor 306-11 through the encoder to get the actual position, and obtain the current current of the motor 306-11 through the current sensor to get the actual current. Then determine whether the actual current of the motor 306-11 exceeds the set value, i.e., whether it is greater than the preset current. If it is, execute Step 4. If not, execute Step 2.

[0102] Step 2: Determine whether the difference between the actual position of the motor 306-11 and the target position (determined based on the optimal opening) is less than the threshold value. If it is, execute Step 5. If not, execute Step 3.

[0103] Step 3: Calculate the target rotating speed of the motor 306-11 through the motor position adjustment PID, and then control the motor 306-11 to execute to the corresponding rotating speed through the controller 306-14, and execute step 5.

[0104] Step 4: Close the motor drive (i.e. the controller 306-14), output an alarm message, and execute step 5.

[0105] Step 5: End the control.

[0106] Embodiment 2

[0107] The embodiment provides a method for adjusting and controlling a parameter-adjustable cleaning system of a combine harvester, applied to the parameter-adjustable cleaning system of the combine harvester in embodiment 1, as shown in the figure, the method for adjusting and controlling the parameter-adjustable cleaning system of the combine harvester comprises the following steps. Figure 10

[0108] S1: Determine the optimal fan rotating speed, the first optimal opening degree and the second optimal opening degree based on the loss rate and the impurity rate.

[0109] S2: Issue a first control instruction based on the optimal fan rotating speed to drive the fan rotating speed regulator to work, and adjust the rotating speed of the fan to the optimal fan rotating speed.

[0110] S3: Issue a second control instruction based on the first optimal opening degree to drive the first sieve plate regulator to work, and adjust the opening degree of the upper sieve to the first optimal opening degree.

[0111] S4: Issue a third control instruction based on the second optimal opening degree to drive the second sieve plate regulator to work, and adjust the opening degree of the lower sieve to the second optimal opening degree.

[0112] Wherein, the optimal fan rotating speed, the first optimal opening degree and the second optimal opening degree are determined based on the loss rate and the impurity rate, and specifically comprising:

[0113] 1) Obtain a plurality of value combinations based on the fan rotating speed adjustment range, the upper sieve opening degree adjustment range and the lower sieve opening degree adjustment range, and the value combination includes the value of the fan rotating speed, the value of the upper sieve opening degree and the value of the lower sieve opening degree.

[0114] 2) For each value combination, issue a fourth control instruction to control the parameter-adjustable cleaning system to work according to the value combination, obtain the loss rate and the impurity rate corresponding to the value combination, and calculate the evaluation result corresponding to the value combination based on the loss rate and the impurity rate corresponding to the value combination.

[0115] 3) Form a data set by combining the plurality of value combinations and the evaluation result corresponding to each value combination.

[0116] ​4) constructing a proxy model of the Bayesian optimization algorithm based on the data set, determining an optimal value combination based on an expected improvement method of the Bayesian optimization algorithm, issuing a fifth control instruction to control the parameter-adjustable cleaning system to work according to the optimal value combination, obtaining a loss rate and a impurity rate corresponding to the optimal value combination, and calculating an evaluation result corresponding to the optimal value combination based on the loss rate and the impurity rate corresponding to the optimal value combination.

[0117] 5) determining whether an absolute value of the evaluation result corresponding to the optimal value combination is less than a preset value.

[0118] 6) if yes, determining a best fan speed, a first best opening degree and a second best opening degree based on the optimal value combination.

[0119] 7) if no, adding the optimal value combination and the evaluation result corresponding to the optimal value combination to the data set to obtain a new data set, and returning to the step of constructing the proxy model of the Bayesian optimization algorithm based on the new data set.

[0120] wherein the first control instruction is issued based on the best fan speed to drive the fan speed regulator to work, and the speed of the fan is adjusted to the best fan speed, and specifically includes:

[0121] 1) determining whether the actual fan speed is greater than a preset speed.

[0122] 2) if yes, calculating a first difference value between the actual fan speed and the best fan speed, and taking the first difference value as an input to calculate a target position of a push rod motor in the fan speed regulator by using a fan speed adjustment PID.

[0123] 3) calculating a second difference value between an actual position and the target position of the push rod motor, and taking the second difference value as an input to calculate an extension amount of the push rod motor by using a push rod position adjustment PID, and outputting the first control instruction based on the extension amount of the push rod motor to drive the push rod motor to work, and adjusting the speed of the fan to the best fan speed.

[0124] wherein the second control instruction is issued based on the first best opening degree to drive the first screen piece regulator to work, and the opening degree of the upper screen is adjusted to the first best opening degree, and specifically includes:

[0125] 1) determining whether an actual current of the motor in the first screen piece regulator is greater than a preset current.

[0126] 2) if no, determining a target position of the motor based on the first best opening degree.

[0127] 3) calculating a third difference value between the actual position of the motor and the target position, taking the third difference value as an input, using a motor position adjustment PID to calculate a target rotating speed of the motor, outputting a second control instruction based on the target rotating speed of the motor to drive the motor to work, and adjusting the opening degree of the upper sieve to the first optimal opening degree.

[0128] The third control instruction is output based on the second optimal opening degree to drive the second sieve sheet adjuster to work, and adjust the opening degree of the lower sieve to the second optimal opening degree, specifically comprising:

[0129] 1) determining whether the actual current of the motor in the second sieve sheet adjuster is greater than a preset current.

[0130] 2) if not, determining the target position of the motor based on the second optimal opening degree.

[0131] 3) calculating a fourth difference value between the actual position of the motor and the target position, taking the fourth difference value as an input, using a motor position adjustment PID to calculate a target rotating speed of the motor, outputting a third control instruction based on the target rotating speed of the motor to drive the motor to work, and adjusting the opening degree of the lower sieve to the second optimal opening degree.

[0132] Embodiment 3

[0133] In an exemplary embodiment, a computer device can be provided, which can be a server or a terminal, and an internal structure diagram thereof can be as shown in Figure 11 The computer device includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is used to store data. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through network connection. The computer program is executed by the processor to implement a kind of joint harvester parameter adjustable cleaning system regulation and control method.

[0134] Those skilled in the art can understand that Figure 11 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0135] In an exemplary embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the method for regulating the parameter-adjustable cleaning system of the combine harvester according to embodiment 2 when executing the computer program.

[0136] Embodiment 4

[0137] In an exemplary embodiment, a computer readable storage medium is provided, storing a computer program, and the computer program implementing the method for regulating the parameter-adjustable cleaning system of the combine harvester according to embodiment 2 when executed by a processor.

[0138] Embodiment 5

[0139] In an exemplary embodiment, a computer program product is provided, comprising a computer program, and the computer program implementing the method for regulating the parameter-adjustable cleaning system of the combine harvester according to embodiment 2 when executed by a processor.

[0140] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0141] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0142] The principles and implementation modes of the present application are described by applying specific examples in the present application, and the above embodiment descriptions are only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A parameter-adjustable cleaning system for a combine harvester, characterized in that, The adjustable cleaning system for the combine harvester includes: a loss rate sensor, a impurity rate sensor, a processor, a fan speed regulator, a first screen regulator, and a second screen regulator. The loss rate sensor is used to detect impurities obtained after cleaning by a parameter-adjustable cleaning system and obtain the loss rate; The impurity rate sensor is used to detect the impurity rate of the grains obtained after cleaning by the parameter-adjustable cleaning system; The processor is used to determine the optimal fan speed, the first optimal opening degree and the second optimal opening degree based on the loss rate and the impurity rate, and to issue a first control command based on the optimal fan speed, a second control command based on the first optimal opening degree and a third control command based on the second optimal opening degree. The fan speed regulator is connected to the fan drive. The fan speed regulator is used to operate based on the first control command to adjust the fan speed to the optimal fan speed. The first screen regulator is connected to the upper screen drive. The first screen regulator is used to work based on the second control command to adjust the opening of the upper screen to the first optimal opening. The second screen regulator is connected to the lower screen drive. The second screen regulator is used to work based on the third control command to adjust the opening of the lower screen to the second optimal opening. The optimal fan speed, first optimal opening degree, and second optimal opening degree are determined based on the loss rate and impurity content, specifically including: Based on the adjustment ranges of fan speed, upper screen opening, and lower screen opening, multiple value combinations are obtained; the value combinations include the values ​​of fan speed, upper screen opening, and lower screen opening. For each value combination, a fourth control command is issued to enable the adjustable control parameter cleaning system to operate according to the value combination, thereby obtaining the loss rate and impurity rate corresponding to the value combination. Based on the loss rate and impurity rate corresponding to the value combination, the evaluation result corresponding to the value combination is calculated. The calculation formula for the evaluation result is: R = -(α*L + (1-α)*Z), where R is the evaluation result, α is the weighting coefficient, L is the loss rate, and Z is the impurity rate. The dataset consists of multiple combinations of values ​​and the evaluation results corresponding to each combination of values; A surrogate model for the Bayesian optimization algorithm is constructed based on the dataset. The optimal value combination is determined based on the expectation improvement method of the Bayesian optimization algorithm. Specifically, the expectation of each value combination in the dataset is calculated, and the value combination with the largest expectation is selected as the optimal value combination. The fifth control command is issued so that the control parameter adjustable cleaning system works according to the optimal value combination. The loss rate and impurity rate corresponding to the optimal value combination are obtained. The evaluation result corresponding to the optimal value combination is calculated based on the loss rate and impurity rate corresponding to the optimal value combination. Determine whether the absolute value of the evaluation result corresponding to the optimal value combination is less than the preset value; If so, then the optimal fan speed, the first optimal opening degree, and the second optimal opening degree are determined based on the optimal combination of values; If not, add the optimal value combination and the evaluation result corresponding to the optimal value combination to the dataset to obtain a new dataset, and use the new dataset as the dataset for the next iteration, returning to the step of "building a surrogate model of Bayesian optimization algorithm based on dataset"; The formula for calculating the expectation is: Where EI is the expected value of the combination of values; μ is the mean of the combination of values; R max γ represents the largest evaluation result in the dataset; σ is the exploration parameter; σ is the standard deviation of the combination of values; and x is the variable.

2. The adjustable cleaning system for combine harvesters according to claim 1, characterized in that, The fan speed regulator includes: a belt, a drive pulley, a driven pulley, a tension pulley, a first fixed pulley, a tension pulley bracket, and a drive component; The drive pulley, driven pulley, and tension pulley are all located inside the belt, while the first fixed pulley is located outside the belt. The drive pulley is connected to the engine drive, and the driven pulley is connected to the fan drive. The first fixed pulley rotates around a fixed shaft on the frame. When the engine drives the drive pulley to rotate, the drive pulley drives the belt to rotate, and the belt drives the driven pulley, tension pulley, and first fixed pulley to rotate. The driven pulley drives the fan to rotate. The tension pulley bracket connects the tension pulley, the first fixed pulley, and the drive component. When the drive component extends or retracts, it drives the tension pulley bracket and the tension pulley to rotate around the axis of the first fixed pulley, causing the belt to be tightened or loosened, changing the equivalent diameter of the driven pulley, and thus changing the speed of the fan.

3. The adjustable cleaning system for combine harvesters according to claim 2, characterized in that, The fan speed regulator also includes: a second fixed pulley, which is located inside the belt and is connected to the first elevator. When the engine drives the drive wheel to rotate, the drive wheel drives the belt to rotate, and the belt also drives the second fixed pulley to rotate. The second fixed pulley drives the first elevator to move and transport the grains obtained after cleaning by the parameter adjustable cleaning system to the grain warehouse. The driving component includes a push rod motor, a first connecting rod, a first spring, and a connector. The push rod motor is connected to the first end of the first connecting rod, the second end of the first connecting rod is connected to the first end of the first spring, the second end of the first spring is connected to the first end of the connector, and the second end of the connector is connected to the tension wheel bracket. The driven pulley includes a disc A, a disc B, bolts, a first guide block, a second spring, a second guide block, washers, nuts, and cotter pins. Disc A has a hollow sleeve at its center, which is fixedly fitted onto the main shaft of the fan. Disc B is fitted onto the hollow sleeve. The opposing surfaces of discs A and B are both inclined planes. Bolts pass sequentially through discs A and B, the first guide block, the second spring, the second guide block, washers, and nuts. The bolts and nuts are threaded together, clamping discs A and B, the first guide block, the second spring, the second guide block, and the washers together, and locking the bolts and nuts with cotter pins. A belt is fitted between discs A and B. When the belt is taut, the distance between discs A and B increases, the equivalent diameter of the driven pulley decreases, and the fan speed increases. When the belt is loosened, the distance between discs A and B decreases, the equivalent diameter of the driven pulley increases, and the fan speed decreases.

4. The adjustable cleaning system for combine harvesters according to claim 1, characterized in that, The upper and lower screens have the same structure. The upper screen includes a fixed frame, a movable frame, and multiple blades. Multiple fixed shafts are set on the fixed frame, and each fixed shaft corresponds to one of the blades. Multiple push rods are set on the movable frame, and each push rod corresponds to one of the blades. When the movable frame moves, the push rods push the blades to rotate around the fixed shafts, changing the opening of the upper screen.

5. The adjustable cleaning system for combine harvesters according to claim 4, characterized in that, The first screen plate adjuster and the second screen plate adjuster have the same structure. The first screen plate adjuster includes: a housing, a lead screw, a first shaft, a second shaft, and a motor. The lead screw, the first shaft, the second shaft, and the motor are all located inside the housing, and both ends of the lead screw extend out of the housing. One end of the lead screw is connected to the moving frame, which drives the moving frame to move. The two ends of the lead screw shaft are hexagonal, and a first limiting block is fitted on each end of the lead screw shaft. The first limiting block is located between the lead screw shaft and the housing and is used to limit the rotation of the lead screw shaft. The middle part of the lead screw shaft is a lead rod, on which a first gear and a second limiting block are fitted. The first gear has a threaded interior, so that the first gear is threadedly connected to the lead rod. The second limiting block is used to limit the up and down movement of the first gear along the lead rod. A second gear and a third gear are mounted on the first shaft, and the second gear meshes with the first gear. The second shaft is equipped with a fourth gear, a fifth gear, and a handwheel. The fourth gear meshes with the third gear, and the handwheel is used to drive the second shaft to rotate. A sixth gear is mounted on the output shaft of the motor, and the sixth gear meshes with the fifth gear.

6. The adjustable cleaning system for combine harvesters according to claim 5, characterized in that, The first limiting block is a slider, and the second limiting block includes a bracket and a retaining ring located on both sides of the first gear. The bracket is fixedly installed on the housing, and the retaining ring is located between the bracket and the first gear. The first screen regulator also includes: limiting rings located at both ends of the first shaft and both ends of the second shaft, respectively, the limiting rings being used to restrict the up-and-down movement of the first shaft and the up-and-down movement of the second shaft; The first screen regulator also includes: a motor bracket, which is installed inside the housing, and a motor is installed on the motor bracket; the motor is a stepper motor.

7. A control method for a combine harvester parameter-adjustable cleaning system, applied to the combine harvester parameter-adjustable cleaning system according to any one of claims 1-6, characterized in that, The control method for the adjustable cleaning system for the combine harvester parameters includes: The optimal fan speed, first optimal opening degree, and second optimal opening degree are determined based on the loss rate and impurity content. The first control command is issued based on the optimal fan speed to drive the fan speed regulator to adjust the fan speed to the optimal fan speed. Based on the first optimal opening, a second control command is issued to drive the first screen regulator to work and adjust the opening of the upper screen to the first optimal opening. A third control command is issued based on the second optimal opening to drive the second screen regulator to adjust the opening of the lower screen to the second optimal opening. The optimal fan speed, first optimal opening degree, and second optimal opening degree are determined based on the loss rate and impurity content, specifically including: Based on the adjustment ranges of fan speed, upper screen opening, and lower screen opening, multiple value combinations are obtained; the value combinations include the values ​​of fan speed, upper screen opening, and lower screen opening. For each value combination, a fourth control command is issued to enable the adjustable control parameter cleaning system to operate according to the value combination, thereby obtaining the loss rate and impurity rate corresponding to the value combination. Based on the loss rate and impurity rate corresponding to the value combination, the evaluation result corresponding to the value combination is calculated. The calculation formula for the evaluation result is: R = -(α*L + (1-α)*Z), where R is the evaluation result, α is the weighting coefficient, L is the loss rate, and Z is the impurity rate. The dataset consists of multiple combinations of values ​​and the evaluation results corresponding to each combination of values; A surrogate model for the Bayesian optimization algorithm is constructed based on the dataset. The optimal value combination is determined based on the expectation improvement method of the Bayesian optimization algorithm. Specifically, the expectation of each value combination in the dataset is calculated, and the value combination with the largest expectation is selected as the optimal value combination. The fifth control command is issued so that the control parameter adjustable cleaning system works according to the optimal value combination. The loss rate and impurity rate corresponding to the optimal value combination are obtained. The evaluation result corresponding to the optimal value combination is calculated based on the loss rate and impurity rate corresponding to the optimal value combination. Determine whether the absolute value of the evaluation result corresponding to the optimal value combination is less than the preset value; If so, then the optimal fan speed, the first optimal opening degree, and the second optimal opening degree are determined based on the optimal combination of values; If not, add the optimal value combination and the evaluation result corresponding to the optimal value combination to the dataset to obtain a new dataset, and use the new dataset as the dataset for the next iteration, returning to the step of "building a surrogate model of Bayesian optimization algorithm based on dataset"; The formula for calculating the expectation is: Where EI is the expected value of the combination of values; μ is the mean of the combination of values; R max γ represents the largest evaluation result in the dataset; σ is the exploration parameter; σ is the standard deviation of the combination of values; and x is the variable.

8. The control method for the adjustable cleaning system of a combine harvester according to claim 7, characterized in that, Based on the optimal fan speed, a first control command is issued to drive the fan speed regulator to adjust the fan speed to the optimal speed, specifically including: Determine whether the actual fan speed is greater than the preset speed; If so, calculate the first difference between the actual fan speed and the optimal fan speed, and use the first difference as input to calculate the target position of the push rod motor in the fan speed regulator using the fan speed adjustment PID. The second difference between the actual position and the target position of the push rod motor is calculated. Using the second difference as input, the PID controller is adjusted using the push rod position to calculate the extension and retraction of the push rod motor. Based on the extension and retraction of the push rod motor, the first control command is output to drive the push rod motor to work and adjust the fan speed to the optimal fan speed.

9. The control method for the adjustable cleaning system of a combine harvester according to claim 7, characterized in that, Based on the first optimal opening degree, a second control command is issued to drive the first screen regulator to adjust the opening degree of the upper screen to the first optimal opening degree, specifically including: Determine whether the actual current of the motor in the first sieve regulator is greater than the preset current; If not, the target position of the motor is determined based on the first optimal opening degree; The third difference between the actual position and the target position of the motor is calculated. Using the third difference as input, the motor position is adjusted using a PID controller to calculate the target speed of the motor. Based on the target speed of the motor, a second control command is output to drive the motor to work and adjust the opening of the upper screen to the first optimal opening.

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