阅读说明：本技术 一种玉米脱粒装置间隙调节控制方法 (Corn threshing device gap adjusting control method ) 是由 张新伟 马千舒 易克传 刘向东 柳伟续 高连兴 孙业荣 于 2021-04-12 设计创作，主要内容包括：本发明公开了一种玉米脱粒装置间隙控制方法,包括：采集玉米籽粒含水率；比较玉米籽粒含水率与预设阈值并获取含水量差值；根据含水量差值确定第二驱动电机的转速；若玉米籽粒含水率高于预设阈值,则通过齿条齿轮传动装置使筛板按预设速率下移,增加脱粒间隙；若玉米籽粒含水率低于预设阈值,则通过齿条齿轮传动装置使筛板按预设速率上移,减小脱粒间隙。安装在粮箱内的水分传感器检测粮箱内已收获玉米籽粒的含水率,并将所测数据实时反馈给单片机,当玉米籽粒的含水率相较预设阈值的含水量差值较大时,单片机使第二驱动电机的转速较快,从而使筛板较快上移或下移,相较于匀速控制筛板上移或下移,更适应实际的玉米脱粒需要。(The invention discloses a clearance control method for a corn threshing device, which comprises the following steps: collecting the water content of corn grains; comparing the water content of the corn grains with a preset threshold value and acquiring a water content difference value; determining the rotating speed of the second driving motor according to the water content difference; if the moisture content of the corn grains is higher than a preset threshold value, the sieve plate moves downwards at a preset speed through the rack and gear transmission device, and the threshing gap is increased; if the moisture content of the corn grains is lower than a preset threshold value, the sieve plate moves upwards at a preset speed rate through the rack and gear transmission device, and the threshing gap is reduced. The moisture sensor arranged in the grain tank detects the moisture content of the corn grains collected in the grain tank, the measured data is fed back to the single chip microcomputer in real time, and when the moisture content of the corn grains is larger than a moisture content difference value of a preset threshold value, the single chip microcomputer enables the rotating speed of the second driving motor to be higher, so that the sieve plate is enabled to move up or down faster, and compared with the situation that the sieve plate is controlled to move up or down at a constant speed, the moisture sensor is more suitable for actual corn threshing needs.)

1. A clearance control method of a corn threshing device is characterized in that a roller is driven by a first driving motor, two ends of a sieve plate in the width direction are respectively provided with a rack and gear transmission device, and the rack and gear transmission device is driven by a second driving motor; the center of the bottom of the sieve plate is provided with a telescopic rod, and the gap control method comprises the following steps:

monitoring the rotating speed of the roller in real time, and collecting the water content of the corn grains;

comparing the water content of the corn grains with a preset threshold value and acquiring a water content difference value;

determining the rotating speed of a second driving motor and the lifting speed of the telescopic rod according to the water content difference value;

if the moisture content of the corn grains is higher than a preset threshold value, the sieve plate synchronously moves downwards at a preset speed through the rack and pinion transmission device and the telescopic rod, and the threshing gap is increased;

if the moisture content of the corn grains is lower than a preset threshold value, the sieve plate synchronously moves upwards according to the preset speed through the rack and pinion transmission device and the telescopic rod, and the threshing gap is reduced;

and determining the preset rate according to the water content difference value between the water content of the corn grains and a preset threshold value.

2. The method of claim 1, wherein the predetermined rate is linearly related to an absolute value of a difference between the moisture content of the corn kernels and the moisture content of the predetermined threshold.

3. The clearance control method of the corn threshing device of claim 2, wherein the thickness of the sieve plate is between 0.5cm and 2cm, and a first reinforcing rib is respectively arranged at two ends of the sieve plate in the width direction; the top of the rack and pinion transmission device is connected to the center of the first reinforcing rib; a second reinforcing rib is arranged at the center of the bottom of the sieve plate; the top of the telescopic rod is connected to the center of the second reinforcing rib; the length of each reinforcing rib is consistent with the length of the sieve plate, and the telescopic rod is driven by a telescopic mechanism.

4. The corn thresher clearance control method of claim 3, wherein the rack and pinion gear comprises a first upper rack, a first gear, a first lower rack, a second upper rack, a second gear, and a second lower rack, each of the upper racks moving up and down along a fixed track, wherein:

the upper end of the first upper rack is fixedly connected with the center of the first reinforcing rib at the first end of the sieve plate in the width direction, the lower end of the first lower rack is fixedly connected with a box body of the corn threshing device, the first gear is connected with a first bearing fixed on the box body, the first gear is meshed with the first upper rack and the first lower rack, and the first upper rack and the first lower rack are respectively arranged on two sides of the first gear;

the upper end of the second upper rack is fixedly connected with the center of the first reinforcing rib at the second end of the sieve plate in the width direction, the lower end of the second lower rack is fixedly connected with the box body, the second gear is connected with a second bearing fixed on the box body, the second gear is meshed with the second upper rack and the second lower rack, and the second upper rack and the second lower rack are respectively arranged on two sides of the second gear.

5. The method of claim 4, wherein the first gear is driven by a first second driving motor through a first speed reducer, the second gear is driven by a second driving motor through a second speed reducer, and the two second driving motors rotate synchronously.

6. The method of claim 5, wherein the rotational speeds of the first and second drive motors are positively correlated to the absolute value of the difference between the moisture content of the corn kernels and the moisture content of the corn kernels at a predetermined threshold.

7. The method of claim 6, further comprising:

comparing the rotating speed of the roller with a preset rotating speed value and acquiring a rotating speed difference value;

determining the lifting height of the upper rack according to the rotating speed difference;

if the real-time rotating speed of the roller is lower than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move downwards through a rack and pinion transmission device, the position of the telescopic rod is kept unchanged, and the threshing contact area of the sieve plate and the roller is reduced;

if the real-time rotating speed of the roller is higher than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move upwards through the rack and gear transmission device, the position of the telescopic rod is kept still, and the threshing contact area of the sieve plate and the roller is increased.

8. The method of claim 7, further comprising:

collecting height information of the sieve plate;

and acquiring the downward moving or upward moving distance of the sieve plate according to the corn kernel water content and the height information of the sieve plate.

9. The method of claim 8, further comprising, after the step of collecting the moisture content of the corn kernels:

performing logic judgment on the corn kernel water content and the preset threshold value and generating a judgment result;

sending the judgment result to a display in a cab; and/or the presence of a gas in the gas,

sending the judgment result to a voice player;

sending a manual operation prompt through the display and/or the voice player according to the judgment result; the manual operation prompt is as follows: if the water content of the corn grains is higher than the preset threshold value, a prompt for increasing threshing gaps is sent; and if the moisture content of the corn grains is lower than the preset threshold value, sending a prompt of reducing threshing gaps.

10. The method of claim 9, wherein the input of the first second driving motor and the input of the second driving motor are both connected to the output of a motor control circuit;

the input end of the motor control circuit is connected with a first pin of the singlechip;

when the first pin sends out a first control signal, the first second driving motor and the second driving motor rotate forwards; and when the first pin sends out a second control signal, the first second driving motor and the second driving motor reversely rotate.

Technical Field

The invention relates to the technical field of agricultural combined harvesting mechanical equipment, in particular to a clearance adjustment control method for a corn threshing device.

Background

In recent years, along with the popularization of agricultural harvesting machinery in China, the corn combine harvester is more and more used for robbing the farm, the labor efficiency is improved, and the yield and income are increased. The threshing device is a core device of the corn combine harvester, and the threshing gap is one of main design parameter indexes.

The humidity of the corn is related to the threshing gap, the existing threshing device with the adjustable threshing gap is mainly used for improving the threshing device from the angle of mechanical design, and the threshing gap adjustment and control aspect of the threshing device for harvesting the corn with high humidity still has defects, so that the problem that the crushing rate and the blocking rate of the threshing device are high when corn grains are harvested is caused.

Disclosure of Invention

In view of this, the embodiment of the invention provides a method for adjusting and controlling a clearance of a corn threshing device, so as to solve the problem that the threshing device has a high breakage rate and a high blockage rate when harvesting corn grains due to the lack of threshing clearance adjustment and control when harvesting corn with high humidity in the prior art.

The embodiment of the invention provides a clearance control method for a corn threshing device, which comprises the following steps:

the roller is driven by a first driving motor, two ends of the sieve plate in the width direction are respectively provided with a rack and gear transmission device, and the rack and gear transmission device is driven by a second driving motor; the center of the bottom of the sieve plate is provided with a telescopic rod, and the gap control method comprises the following steps:

monitoring the rotating speed of the roller in real time, and collecting the water content of the corn grains;

comparing the water content of the corn grains with a preset threshold value and acquiring a water content difference value;

determining the rotating speed of a second driving motor and the lifting speed of the telescopic rod according to the water content difference value;

if the moisture content of the corn grains is higher than a preset threshold value, the sieve plate synchronously moves downwards at a preset speed through the rack and pinion transmission device and the telescopic rod, and the threshing gap is increased;

if the moisture content of the corn grains is lower than a preset threshold value, the sieve plate synchronously moves upwards according to the preset speed through the rack and pinion transmission device and the telescopic rod, and the threshing gap is reduced;

and determining the preset rate according to the water content difference value between the water content of the corn grains and a preset threshold value.

Preferably, the preset rate and the absolute value of the water content difference value between the corn kernel water content and the preset threshold value are in a linear relation.

Preferably, the thickness of the sieve plate is 0.5cm-2cm, and two ends of the sieve plate in the width direction are respectively provided with a first reinforcing rib; the top of the rack and pinion transmission device is connected to the center of the first reinforcing rib; a second reinforcing rib is arranged at the center of the bottom of the sieve plate; the top of the telescopic rod is connected to the center of the second reinforcing rib; the length of each reinforcing rib is consistent with the length of the sieve plate, and the telescopic rod is driven by a telescopic mechanism.

Preferably, the rack and pinion gear includes a first upper rack, a first gear, a first lower rack, a second upper rack, a second gear, and a second lower rack, each of the upper racks moving up and down along a fixed track, wherein:

the upper end of the first upper rack is fixedly connected with the center of the first reinforcing rib at the first end of the sieve plate in the width direction, the lower end of the first lower rack is fixedly connected with a box body of the corn threshing device, the first gear is connected with a first bearing fixed on the box body, the first gear is meshed with the first upper rack and the first lower rack, and the first upper rack and the first lower rack are respectively arranged on two sides of the first gear;

the upper end of the second upper rack is fixedly connected with the center of the first reinforcing rib at the second end of the sieve plate in the width direction, the lower end of the second lower rack is fixedly connected with the box body, the second gear is connected with a second bearing fixed on the box body, the second gear is meshed with the second upper rack and the second lower rack, and the second upper rack and the second lower rack are respectively arranged on two sides of the second gear.

Preferably, the first gear is driven by a first second driving motor through a first speed reducer, the second gear is driven by a second driving motor through a second speed reducer, and the two second driving motors rotate synchronously.

Preferably, the rotation speeds of the first second driving motor and the second driving motor are positively correlated with the absolute value of the water content difference value between the corn kernel water content and the preset threshold value.

Preferably, the method further comprises the following steps:

comparing the rotating speed of the roller with a preset rotating speed value and acquiring a rotating speed difference value;

determining the lifting height of the upper rack according to the rotating speed difference;

if the real-time rotating speed of the roller is lower than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move downwards through a rack and pinion transmission device, the position of the telescopic rod is kept unchanged, and the threshing contact area of the sieve plate and the roller is reduced;

if the real-time rotating speed of the roller is higher than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move upwards through the rack and gear transmission device, the position of the telescopic rod is kept still, and the threshing contact area of the sieve plate and the roller is increased.

Preferably, the method further comprises the following steps:

collecting height information of the sieve plate;

and acquiring the downward moving or upward moving distance of the sieve plate according to the corn kernel water content and the height information of the sieve plate.

Preferably, after the moisture content of the corn kernels is collected, the method further comprises the following steps:

performing logic judgment on the corn kernel water content and the preset threshold value and generating a judgment result;

sending the judgment result to a display in a cab; and/or the presence of a gas in the gas,

sending the judgment result to a voice player;

sending a manual operation prompt through the display and/or the voice player according to the judgment result; the manual operation prompt is as follows: if the water content of the corn grains is higher than the preset threshold value, a prompt for increasing threshing gaps is sent; and if the moisture content of the corn grains is lower than the preset threshold value, sending a prompt of reducing threshing gaps.

Preferably, the input end of the first second driving motor and the input end of the second driving motor are both connected with the output end of the motor control circuit;

the input end of the motor control circuit is connected with a first pin of the singlechip;

when the first pin sends out a first control signal, the first second driving motor and the second driving motor rotate forwards; and when the first pin sends out a second control signal, the first second driving motor and the second driving motor reversely rotate.

According to the clearance control method of the corn threshing device provided by the embodiment of the invention, the moisture content of the harvested corn grains in the grain tank is detected through the moisture sensor arranged in the grain tank, the detected data are fed back to the single chip microcomputer in real time, the single chip microcomputer calculates the rotating speed of the second driving motor according to the moisture content of the corn grains detected in real time, and meanwhile, the telescopic rod arranged below the flexible sieve plate is controlled to move up/down, so that the telescopic rod moves down in the process of moving up the whole sieve plate, the radian of the sieve plate is reduced, and the contact area among the roller, the corn grains and the sieve plate is increased; in the process that the sieve plate integrally moves downwards, the telescopic rod moves upwards to increase the radian of the sieve plate and reduce the contact area among the rollers, the corn kernels and the sieve plate. Specifically, when the water content of the corn grains is larger than the water content difference of the preset threshold, the rotating speed of the second driving motor is higher, so that the sieve plate moves up or down faster, and the corn threshing device is more suitable for actual corn threshing requirements compared with a mode of controlling the sieve plate to move up or down according to a fixed speed.

Drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:

FIG. 1 shows a flow chart of a method for adjusting the gap of a corn thresher in accordance with an embodiment of the present invention;

FIG. 2 is a partial block diagram of a clearance adjustment mechanism of a corn thresher according to an embodiment of the present invention;

FIG. 3 shows a block diagram of another corn thresher clearance adjustment assembly according to an embodiment of the present invention;

FIG. 4 shows a control circuit diagram of a clearance adjustment device of a corn threshing device in an embodiment of the invention;

fig. 5 shows a structure diagram of a clearance adjustment terminal of a corn threshing device in an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a clearance control method for a corn threshing device, as shown in figures 1-3, a roller is driven by a first driving motor, two ends of a sieve plate in the width direction are respectively provided with a rack and gear transmission device, and the rack and gear transmission device is driven by a second driving motor; the center of the bottom of the sieve plate is provided with a telescopic rod, and the control method of the gap comprises the following steps:

and step S10, monitoring the rotating speed of the roller in real time and collecting the moisture content of the corn kernels.

In this embodiment, install a moisture sensor in the grain tank, moisture sensor is connected with the treater in the control room, gathers maize seed grain moisture content in real time.

And step S20, comparing the corn kernel water content with a preset threshold value and acquiring a water content difference value.

In this embodiment, the moisture content of the collected corn kernels is determined.

And step S30, determining the rotating speed of the second driving motor and the lifting speed of the telescopic rod according to the water content difference.

In the present embodiment, the rotation speed of the second drive motor is determined based on the water content difference in step S20. The second drive motor is used here to drive the lifting of the rack and pinion gear, i.e. the lifting speed of the rack and pinion gear is determined by the difference in water content. And determining the lifting speed of the telescopic rod according to the water content difference in the step S20. The telescopic rod is used for controlling the lifting of the center of the screen plate, namely, the lifting speed of the center of the screen plate is determined by the water content difference.

And step S40, comparing the moisture content of the corn grains with a preset threshold value.

In the present embodiment, step S40 is performed simultaneously with step S30. Step S20 is to determine the lifting speed of the rack and pinion gear and the lifting speed of the telescopic rod, and this step determines the upward movement or downward movement of the rack and pinion gear.

And step S50, if the moisture content of the corn grains is higher than a preset threshold value, the sieve plate synchronously moves downwards at a preset speed through the rack-and-pinion transmission device and the telescopic rod, and the threshing gap is increased.

In this embodiment, the preset rate is set according to the moisture content difference between the moisture content of the corn kernels and the preset threshold.

And step S60, if the moisture content of the corn grains is lower than a preset threshold value, the sieve plate synchronously moves upwards at a preset speed through the rack and pinion transmission device and the telescopic rod, and the threshing gap is reduced.

The threshing gap is too large, so that the threshing effect is influenced, the threshing gap is too small, so that the corn kernels are crushed, the threshing resistance is increased, the threshing efficiency is reduced, and the threshing gap is mainly determined by the moisture content of the corn kernels.

In this embodiment, the drum 211 is fixed within the grain bin of the corn thresher. The moisture sensor arranged in the grain tank detects the moisture content of the harvested corn grains in the grain tank, the measured data is fed back to the single chip microcomputer in real time, the single chip microcomputer calculates the rotating speed and the rotating quantity of the second driving motor according to the moisture content of the corn grains measured in real time, the lifting speed and the lifting quantity of the two ends of the sieve plate are controlled accordingly, and meanwhile, the lifting speed and the lifting quantity of the telescopic rod are controlled by controlling the upward movement/downward movement of the telescopic rod 213 arranged below the flexible sieve plate 207.

Specifically, height information of the sieve plate is collected; and the downward moving or upward moving distance of the sieve plate is obtained according to the moisture content of the corn kernels and the height information of the sieve plate so as to ensure the optimal threshing gap and the optimal rotating speed of the roller.

In the specific operation process, various changes can be made, the first is that two ends and the center of the sieve plate are lifted synchronously, and the contact area among the gap, the roller, the corn kernels and the sieve plate is mainly adjusted; the second is that both ends of the sieve plate are lifted synchronously, the central position of the sieve plate is fixed, and the contact area among the roller, the corn kernels and the sieve plate is mainly adjusted; the third is that the two ends of the sieve plate are fixed, the center of the sieve plate is lifted, and the gap is mainly adjusted.

If the moisture content of the corn grains is higher than a preset threshold value, the sieve plate synchronously moves downwards at a preset speed rate through the rack and gear transmission device and the telescopic rod, the threshing gap is increased, and normal separation is guaranteed. If the moisture content of the corn grains is lower than a preset threshold value, the sieve plate synchronously moves upwards at a preset speed through the rack and gear transmission device and the telescopic rod, the threshing gap is reduced, and normal separation is guaranteed.

If the moisture content of the corn grains floats in a small range around the preset threshold value, the height position of the center of the sieve plate can be adjusted only, so that the threshing gap is adjusted, specifically, the positions of two ends of the sieve plate are fixed, the center of the sieve plate is lifted, the threshing gap is adjusted in a floating mode according to the moisture content difference, and the threshing effect is guaranteed.

Comparing the rotating speed of the roller with a preset rotating speed value of the roller and acquiring a rotating speed difference value, wherein the preset rotating speed of the roller is determined according to the model of the threshing equipment, and the lifting height of the upper rack is determined according to the rotating speed difference value;

if the real-time rotating speed of the roller is lower than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move downwards through the rack and gear transmission device, the position of the telescopic rod is kept still, and the threshing contact area of the sieve plate and the roller is reduced; specifically, in the process that the both ends of the sieve plate move down synchronously, the telescopic rod is fixed, so that the radian of the sieve plate is reduced, as shown in fig. 2, the contact area among the roller, the corn kernels and the sieve plate is reduced, the friction force can be reduced, and the rotating speed of the roller is increased.

If the real-time rotating speed of the roller is higher than the preset rotating speed value of the roller, the two ends of the sieve plate in the width direction synchronously move upwards through the rack and gear transmission device, the position of the telescopic rod is kept still, and the threshing contact area of the sieve plate and the roller is increased. Specifically, in the process that the two ends of the sieve plate synchronously move upwards, the telescopic rods are fixed, the radian of the sieve plate is increased, as shown in fig. 3, the contact area among the rollers, the corn kernels and the sieve plate is increased, the friction force can be increased, and therefore the rotating speed of the rollers is reduced.

The preset rate is determined according to the water content difference value between the water content of the corn grains and a preset threshold value. When the water content of the corn grains is larger than the water content difference value of the preset threshold value, the rotating speed of the second driving motor is higher and the telescopic speed of the telescopic rod is higher, so that the sieve plate moves up or down faster, and the method is more suitable for actual corn threshing requirements compared with a method of controlling the sieve plate to move up or down according to a fixed speed.

When the moisture content of the harvested corn grains is higher than a preset threshold value: the single chip microcomputer enables the second driving motor to be started through the motor control circuit, the second driving motor rotates clockwise to drive the gear in the rack-and-pinion transmission device to rotate, the upper rack in the rack-and-pinion transmission device is driven to move downwards, and therefore the sieve plate fixed on the upper rack moves downwards, and threshing gap is enlarged.

When the moisture content of the harvested corn kernels is lower than a set threshold value: the single chip microcomputer enables the second driving motor to be started through the motor control circuit, the second driving motor rotates anticlockwise to drive the gear in the rack-and-pinion transmission device to rotate, the upper rack in the rack-and-pinion transmission device is driven to move upwards, the sieve plate fixed on the upper rack is moved upwards, and threshing gap reduction is achieved.

The telescopic rod is driven by a telescopic mechanism, and the driving speed and distance of the telescopic mechanism are also determined by the water content difference. As an optional implementation manner, the preset rate and the absolute value of the water content difference value between the water content of the corn kernels and the preset threshold value are in a linear relationship.

In this embodiment, a base rate is determined, and the actual upward or downward moving rate of the sieve plate is calculated by using the absolute value of the difference between the moisture content of the corn kernels and the moisture content of the preset threshold as a coefficient.

The thickness of the sieve plate is 1.5cm, the strength and the toughness of the sieve plate are ensured, and two ends of the sieve plate in the width direction are respectively provided with a first reinforcing rib; the top of the rack and gear transmission device is connected to the center of the first reinforcing rib; a second reinforcing rib is arranged at the center of the bottom of the sieve plate; the top of the telescopic rod is connected to the center of the second reinforcing rib; the length of each strengthening rib is unanimous with sieve plate length, and the setting of strengthening rib is for promoting sieve plate intensity, avoids taking place the damage in the deformation process, as optional implementation, as shown in fig. 2, rack and pinion gear includes rack 201 on the first 201, first gear 202, first rack 203, second on rack 204, second gear 205 and the rack 206 under the second, and each goes up the rack and reciprocates along fixed track, wherein: the upper end of the first upper rack 201 is fixedly connected with the center of a first reinforcing rib at the first end of the sieve plate 207 in the width direction, the lower end of the first lower rack 203 is fixedly connected with a box body 208 of the corn threshing device, the first gear 202 is connected with a first bearing 209 fixed on the box body 208, the first gear 202 is meshed with the first upper rack 201 and the first lower rack 203, and the first upper rack 201 and the first lower rack 203 are respectively arranged at two sides of the first gear 202; the upper end of the second upper rack 204 is fixedly connected with the center of the first reinforcing rib at the second end of the screening plate 207 in the width direction, the lower end of the second lower rack 206 is fixedly connected with the box body 208, the second gear 205 is connected with a second bearing 210 fixed on the box body 208, the second gear 205 is meshed with the second upper rack 204 and the second lower rack 206, and the second upper rack 204 and the second lower rack 206 are respectively arranged at two sides of the second gear 205. The drum 211 is fixed in the cabinet by a bearing 212.

In this embodiment, first rack and second rack down among the rack and pinion transmission are fixed on the box, first gear and first last rack and first rack engagement down, first gear drives first last rack and rises or descends when clockwise rotation or anticlockwise rotation, and is same, second gear and second go up rack and second rack engagement down, when clockwise rotation or anticlockwise rotation, the second gear drives second and goes up the rack and rise or descend, in order to reduce or increase the clearance between sieve and the cylinder.

The rack and pinion transmission device is two groups of completely consistent transmission structures which are respectively arranged in tandem on the sieve plate, and can realize the state that the sieve plate is always parallel to the roller in the process of adjusting the threshing gap on the premise that the sieve plate is parallel to the roller.

In an alternative embodiment, the first gear is driven by a first second drive motor via a first reduction gear, and the second gear is driven by a second drive motor via a second reduction gear.

In this embodiment, since the rotation speed of the second driving motor is too fast, the first gear and the second gear can be rotated at a slow speed in cooperation with the speed reducer, and the second driving motor has sufficient response time to raise or lower the first upper rack and the second upper rack to a target height in a case where the gap adjustment distance is small.

As an optional implementation manner, the rotation speeds of the first second driving motor and the second driving motor are positively correlated with the absolute value of the water content difference between the water content of the corn kernels and the preset threshold value.

In this embodiment, the derivative of the increased rotation speeds of the first second driving motor and the second driving motor has a linear relationship with the absolute value of the water content difference between the water content of the corn kernel and the preset threshold, and the rotation speeds of the first second driving motor and the second driving motor increase with the increase of the absolute value of the water content difference between the water content of the corn kernel and the preset threshold.

As an optional implementation manner, after step S20, the method further includes: performing logic judgment on the corn kernel water content and the preset threshold value and generating a judgment result; sending the comparison result to a display in the cab; and/or sending the comparison result to a voice player.

In this embodiment, as shown in fig. 4, a CY 2433 24533A single chip microcomputer is adopted, and the output end of the moisture sensor is connected to a P2 — 8 pin of the single chip microcomputer. After receiving the detection data of the moisture sensor, the single chip microcomputer carries out logic judgment on the detection data and a set threshold value, and sends a judgment result to a display in a cab through a P2_1 pin, so that an operator can conveniently check the judgment result; meanwhile, the judgment result is sent to a voice player through a P2_3 pin for voice playing, so that an operator is prevented from not viewing information on a display in time.

As an optional implementation mode, sending out a manual operation prompt through a display and/or a voice player according to the comparison result; the manual operation prompts are as follows: if the water content of the corn grains is higher than a preset threshold value, a prompt for increasing threshing gaps is sent; and if the water content of the corn grains is lower than a preset threshold value, sending a prompt of reducing the threshing clearance.

In the embodiment, the singlechip simultaneously sends the comparison result and the manual operation prompt to the display and/or the voice player, so that misoperation when an operator uses a manual mode to adjust the clearance of the threshing device is prevented.

In a particular embodiment, the manual mode is prioritized over the automatic mode.

As an alternative embodiment, as shown in fig. 4, the input end of the first second driving motor and the input end of the second driving motor are both connected to the output end of the motor control circuit; the input end of the motor control circuit is connected with a first pin P1_5 of the single chip microcomputer; when the first pin P1_5 sends out the first control signal, the first second driving motor and the second driving motor rotate forward; when the first pin P1_5 sends the second control signal, the first second driving motor and the second driving motor rotate reversely.

In this embodiment, the first pin P1_5 outputs a high level signal or a low level signal to trigger a switch state change in the motor control circuit, so that the V phase of the three-phase asynchronous motor is not changed, and the U phase is opposite to the W phase, thereby realizing the switching between forward rotation and reverse rotation of the three-phase asynchronous motor.

As an optional implementation manner, after the manual operation prompt is sent out through the display and/or the voice player, the method further includes: inputting a first control signal or a second control signal through a controller; the controller includes a button or rocker.

In this embodiment, the controller is provided with two buttons, which respectively send a first control signal and a second control signal of the motor control circuit to a first pin P1_5 of the single chip microcomputer. Or the controller is a rocker, and when the controller is pushed upwards or pushed downwards, the controller respectively sends a first control signal and a second control signal of the motor control circuit to the first pin P1_5 corresponding to the single chip microcomputer.

As an optional implementation, further comprising: collecting height information of a sieve plate; and acquiring the downward moving or upward moving distance of the sieve plate according to the water content of the corn kernels and the height information of the sieve plate.

In this embodiment, the height information of the screen deck is collected and recorded, and the height information is analyzed to determine the default screen deck height position.

Set up the automatic re-setting button, can stop rack and pinion transmission through automatic re-setting and drive the sieve up-and-down motion and make the sieve get back to acquiescence height position, after the completion that resets, according to the real-time moisture content data of the interior maize seed grain of grain bin that the singlechip received, drive rack and pinion transmission and drive the sieve up-and-down motion, realize the automatic control that the clearance of threshing increases or reduces.

The embodiment of the present invention further provides a clearance adjustment terminal for a corn threshing device, as shown in fig. 5, the clearance adjustment terminal for a corn threshing device may include a processor 51 and a memory 52, wherein the processor 51 and the memory 52 may be connected by a bus or in other manners, and fig. 5 takes the connection by a bus as an example.

The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.

The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 51 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 52, namely, the corn thresher clearance adjustment method in the above-described method embodiments.

The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform the corn thresher gap adjustment method of the embodiment shown in fig. 1-4.

The specific details of the vehicle terminal may be understood by referring to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to fig. 4, and are not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.