JP2022012000A - combine - Google Patents

Abstract

To provide a combine capable of efficiently performing a sequence of operations including grain culm reaping, grain threshing from grain culms, measurement of a grain moisture content and cleaning of a moisture sensor.SOLUTION: A detection operation for making a moisture sensor measure a grain moisture content is performed (S7) in a state in which grain culm reaping and grain threshing from grain culms are performed (S2: YES), by drive control for the moisture sensor. In addition, after the measurement of the grain moisture content, the moisture sensor performs a cleaning operation for cleaning an electrode roller (S8).SELECTED DRAWING: Figure 7

Description

The present invention relates to a combine.

In the combine, the root of the grain culm planted in the field is cut by a cutting device, the cut grain culm is transported from the cutting device to the threshing device, and the grain culm is threshed by the threshing device. Grains such as paddy that have come off the culm are transported from the threshing device to a discharge section provided at the upper part of the grain tank, and are discharged from the discharge section into the grain tank.

Some combines are equipped with a moisture sensor (moisture meter) for measuring the amount of moisture contained in the harvested grains. The moisture sensor has a configuration in which, for example, a pair of electrode rollers are rotated in a direction in which grains are involved, the grains are crushed between the electrode rollers, and the electric resistance value between the electrode rollers at that time is detected. The amount of water contained in the grains can be determined from the electric resistance value (see, for example, Patent Document 1).

Japanese Patent No. 6451513

Therefore, when the water content of grains containing a large amount of water is measured, the crushed grains may adhere to the electrode rollers, and the grains may remain attached to the electrode rollers without falling off from the electrode rollers. .. If the next measurement of the water content of the grain is performed in this state, the water content cannot be accurately measured. Further, if the state is left unattended, grains may adhere to the electrode rollers and the electrode rollers may not rotate satisfactorily.

In order to prevent grains from remaining attached to the electrode rollers, the electrode rollers may be cleaned, but it is necessary to devise the timing of cleaning.

An object of the present invention is to provide a combine capable of efficiently performing a series of operations including cutting of a culm, threshing from the culm, measuring the water content of a grain, and cleaning a water sensor.

In order to achieve the above object, the combine according to the present invention has a reaping device for reaping the grain stalks planted in the field, a shaving device for shaving the shavings cut by the shaving device, and a grain shaving device. It is provided to receive the grain tank that stores the grains that have separated from the grain and the grains that are discharged into the grain tank. With the moisture sensor and the reaping device and the grain removal device operating, the moisture sensor is detected and operated to measure the moisture content of the grain from the detected value of the moisture sensor, and the moisture content is measured. Includes a control device that cleans and operates the moisture sensor in response to the completion of.

According to this configuration, the moisture sensor performs a detection operation for measuring the moisture content of the grain in a state where the grain is being cut and threshed from the grain. As a result, it is possible to suppress the moisture sensor from performing the detection operation in the state where the grain is not present in the moisture sensor.

Further, after measuring the water content of the grain, the water sensor performs a cleaning operation of self-cleaning the water sensor. As a result, it is possible to prevent the moisture sensor from being unnecessarily cleaned even though the moisture content of the grain has not been measured.

Therefore, it is possible to efficiently perform a series of operations including cutting the grain culm, threshing from the grain culm, measuring the water content of the grain, and cleaning the water sensor.

The moisture sensor includes a pair of electrode rollers, and in the detection operation, the pair of electrode rollers rotate forward in the direction of entraining the grains between the electrode rollers, and the grains are crushed between the electrode rollers. The electric resistance value between the electrode rollers at the time of crushing is detected, and the value corresponding to the amount of water contained in the grain is output. In the cleaning operation, the pair of electrode rollers are reversed and the surface of the electrode rollers is cleaned. It may be configured to be.

It is preferable that the control device detects and operates the moisture sensor after confirming the presence of grains in the moisture sensor.

This makes it possible to prevent the moisture sensor from performing a detection operation for measuring the moisture content of the grain in a state where the grain is not present in the moisture sensor. As a result, a series of operations including cutting the culm, threshing from the culm, measuring the water content of the grain, and cleaning the water sensor can be performed more efficiently.

The combine may further include a culm sensor for detecting the presence of culm in the harvester. In this case, it is preferable that the control device operates the moisture sensor to detect the presence of the culm after the presence of the culm is detected by the grain sensor.

As a result, it is possible to prevent the moisture sensor from performing a detection operation for measuring the moisture content of the grain in a state where the grain culm is not cut by the cutting device. As a result, a series of operations including cutting of the culm, threshing from the culm, measurement of the water content of the grain, and cleaning of the water sensor can be performed more efficiently.

The control device may perform a cleaning operation of the moisture sensor before detecting and operating the moisture sensor.

This makes it possible to measure the water content of the grain while the water sensor is clean. Therefore, the water content of the grain can be measured accurately.

According to the present invention, it is possible to efficiently perform a series of operations including cutting the culm, threshing from the culm, measuring the water content of the grain, and cleaning the water sensor.

It is a right side view of the combine which concerns on one Embodiment of this invention. It is the figure which looked at the inside of the Glen tank from the right side. It is a perspective view of the upper part of the front end in a grain tank. It is a perspective view of the rear end part in a grain tank. It is a perspective view of a moisture sensor. It is a block diagram which shows the main part of the electric composition of a combine. It is a flowchart which shows an example of the drive control of a moisture sensor. It is a flowchart which shows the other example of the drive control of a moisture sensor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Overall composition of combine>
FIG. 1 is a right side view of the combine 1 according to the embodiment of the present invention.

Combine 1 is an example of a harvester that cuts culms and threshs from culms while traveling in a field. The combine 1 employs a pair of left and right crawlers 2 as a traveling device having the ability to run through rough terrain such as a field, and the aircraft 3 supported by the pair of left and right crawlers 2 includes a cabin 4 and a grain tank. 5 is provided.

The cabin 4 is arranged on the front end of the crawler 2. The cabin 4 provides a space for the driver to board, and in the space, for example, an operation member such as a driver's seat on which the driver sits, an operation lever, and an operation pedal are arranged. A door 6 that can be opened and closed is provided on the right side surface of the cabin 4, and the driver can open the door 6 and get into the cabin 4.

The grain tank 5 is arranged on the crawler 2 behind the cabin 4.

Further, the body 3 of the combine 1 is provided with a harvesting device 7 and a threshing device (not shown). The reaping device 7 is arranged on the front side of the crawler 2, and as the combine 1 advances, the culm planted in the field is reaped. The threshing device is arranged on the left side of the grain tank 5, and the stock root side of the culm cut by the reaping device 7 is transported to the rear side by the threshing feed chain, and the tip side of the culm is supplied to the handling room. Thresh. Then, the grains removed from the grain culm are transported from the threshing device to the grain tank 5, and the grains are stored in the grain tank 5. An unloader 8 is connected to the grain tank 5, and the grains stored in the grain tank 5 can be carried out by the unloader 8 and discharged to the outside of the machine.

<Internal configuration of Glen tank>
FIG. 2 is a view of the inside of the Glen tank 5 as viewed from the right side. FIG. 3 is a perspective view of the upper part of the front end in the Glen tank 5.

In the grain tank 5, as shown in FIGS. 2 and 3, a transport / discharge unit 11 is provided at the upper part of the front end. As shown in FIG. 3, the transport / discharge unit 11 has a transport unit 12 that transports grains sent from the threshing device into the grain tank 5, and a transport unit 12 that transports the grains transported by the transport unit 12 into the grain tank 5. It is integrally provided with a discharge unit 13 for discharging.

The transport portion 12 extends to the right from the front upper end portion of the left side wall 14 of the Glen tank 5. The transport unit 12 includes a transport screw 16 in a substantially cylindrical transport case 15.

The transport case 15 is connected to the left side wall 14. On the left side wall 14, a circular opening is formed in a portion surrounded by the transport case 15 with a diameter substantially the same as the inner diameter of the transport case 15.

The transport screw 16 includes a screw shaft 17 extending on the center line of the transport case 15, and a spiral screw blade 18 supported by the screw shaft 17. The screw shaft 17 extends to the left side of the left side wall 14 through the opening of the left side wall 14. A pulley (not shown) is attached to the left end of the screw shaft 17 so as not to rotate relative to each other, and the transport screw 16 is rotated by a driving force input to the pulley.

The discharge unit 13 is connected to the right end of the transport unit 12, is supported by the transport unit 12, and is spaced rearward from the front wall 21 of the grain tank 5 in the central portion in the left-right direction in the grain tank 5. It is arranged with a space.

The discharge unit 13 includes a discharge case 22. The discharge case 22 has a semi-cylindrical peripheral surface portion 23 that bulges forward, a plate-shaped upper plate portion 24 that extends rearward from the upper end of the peripheral surface portion 23, and an inclined rearward upper side from the lower end of the peripheral surface portion 23. It has a plate-shaped guide plate portion 25 that extends, and an end face portion 26 that closes the space inside the peripheral surface portion 23 from the right side. The space between the upper plate portion 24 and the guide plate portion 25 is opened as a discharge port 27 that allows the inside of the discharge case 22 to communicate with the inside of the grain tank 5.

The screw shaft 17 advances into the discharge case 22 and is rotatably inserted into the end face portion 26 of the discharge case 22. In the discharge case 22, two rotary blades 28 and 29 are supported on the screw shaft 17. The rotary blades 28 and 29 are each formed in a substantially rectangular plate shape, and extend from the screw shaft 17 on opposite sides to each other.

The transport screw 16 rotates in the direction in which the rotary blades 28 and 29 pass through the discharge port 27 from bottom to top. The grains sent out from the threshing device are conveyed in the transport case 15 toward the discharge case 22 by the rotation of the screw blades 18. Then, the grains conveyed into the discharge case 22 are swept away by the rotating rotary blades 28 and 29, and are directed from the discharge port 27 into the grain tank 5 mainly along the upper surface of the guide plate portion 25 of the discharge case 22. Jump out to.

FIG. 4 is a perspective view of the rear end portion in the Glen tank 5.

A moisture sensor 32 for measuring the amount of moisture contained in the grain is attached to the rear wall 31 of the grain tank 5. The moisture sensor 32 penetrates the rear wall 31, and its front end portion is exposed from the inner surface of the rear wall 31, that is, the rear surface 33 in the grain tank 5 into the grain tank 5. The moisture sensor 32 is located on the rear surface 33 at a position above the center in the vertical direction and lower than the discharge port 27 of the discharge unit 13 and at a position offset to the right side of the center in the left-right direction (position near the right end). Have been placed. Specifically, the flow rate of the grains scattered from the discharge port 27 is set to a constant flow rate, and the grains contain a certain amount of water or more and protrude from the discharge port 27 in the direction along the guide plate portion 25 to draw a parabola. The arrival position on the rear surface 33 of the scattered grains is determined by an experiment or a simulation, and the moisture sensor 32 is arranged at the determined arrival position.

FIG. 5 is a perspective view of the moisture sensor 32.

The moisture sensor 32 includes a box-shaped sensor case 41. On the front surface of the sensor case 41, a receiving port 42 for receiving grains is formed in the sensor case 41. The receiving port 42 has a symmetrical shape, and has a V-shaped lower side 43 that opens upward and is inclined to the left side at a relatively small angle from the upper left end of the lower side 43 in the vertical direction (vertical direction). The first left side 44 extending upward, the second left side 45 extending upward from the upper end of the first left side 44 at a relatively large angle to the left with respect to the vertical direction, and the upper right end of the lower side 43 in the vertical direction. On the other hand, the first right side 46 which is inclined to the right side at a relatively small angle and extends upward, and the second side which is inclined upward from the upper end of the first right side 46 to the right side at a relatively large angle with respect to the vertical direction. It has a right side 47. Planes 51, 52, 53, 54 extend to the rear side from the first left side 44, the second left side 45, the first right side 46, and the second right side 47, respectively, and these planes 51, 52, 53, 54 extend. It functions as a guide surface for guiding the grains into the sensor case 41.

In the sensor case 41, a pair of electrode rollers 61 and 62 are provided in the roller accommodating space on the rear side of the receiving port 42. The electrode rollers 61 and 62 integrally have roller shafts 63 and 64 that are parallel to each other and extend in the front-rear direction. The peripheral surfaces of the electrode rollers 61 and 62 are arranged close to each other in the left-right direction. A large number of minute irregularities are formed on the peripheral surfaces of the electrode rollers 61 and 62.

A DC motor (not shown) is provided in the sensor case 41, and the pair of electrode rollers 61 and 62 rotate forward and reverse due to the driving force of the DC motor. In the normal rotation of the electrode rollers 61 and 62, the electrode roller 61 rotates counterclockwise and the electrode roller 62 rotates clockwise when viewed from inside the Glen tank 5. In the reversal of the electrode rollers 61 and 62, the electrode roller 61 rotates clockwise and the electrode roller 62 rotates counterclockwise when viewed from inside the Glen tank 5.

Further, a guide member 65 is provided in the sensor case 41. The guide member 65 is rotatably supported by the roller shaft 63 of the left electrode roller 61, but has an appropriate frictional resistance with the roller shaft 63. Therefore, the guide member 65 is supported by a guide member 65 from other than the roller shaft 63. In a state where no external force acts, the roller shaft 63 rotates with the roller shaft 63. A stopper for regulating the rotation range of the guide member 65 is provided in the sensor case 41. As a result, the guide member 65 is arranged at the position on the front upper side of the electrode rollers 61 and 62 when the electrode rollers 61 and 62 rotate in the normal direction, and is located on the upper left of the position when the electrode rollers 61 and 62 rotate in the normal direction. It is arranged at the side position (the position on the upper left front side of the electrode rollers 61 and 62). The guide member 65 has a substantially triangular shape in a plan view and a substantially V shape open to the upper side in a front view in a state of being arranged at positions on the front upper side of the electrode rollers 61 and 62.

A part of the grains scattered from the discharge port 27 of the discharge unit 13 reaches the position of the sensor case 41 and is received in the sensor case 41 from the reception port 42 of the sensor case 41. When the electrode rollers 61 and 62 rotate in the normal direction, the guide member 65 is located at the position on the front upper side of the electrode rollers 61 and 62. It is guided on the electrode rollers 61 and 62 by the guide member 65. Further, a part of the grains that jump into the sensor case 41 from the receiving port 42 reaches directly on the electrode rollers 61 and 62. Then, the grains on the electrode rollers 61 and 62 are sandwiched between the electrode rollers 61 and 62 and crushed by the normal rotation of the electrode rollers 61 and 62. In the moisture sensor 32, the electric resistance value between the electrode rollers 61 and 62 at the time of crushing the grain is detected, and the value of the amount of water contained in the grain is obtained from the electric resistance value. Then, the obtained value is output from the moisture sensor 32 (detection operation).

In the control device in which the electric resistance value between the electrode rollers 61 and 62 at the time of crushing the grain is output from the moisture sensor 32 and the output value of the moisture sensor 32 is input, the grain is obtained from the electric resistance value. The value of the amount of water contained in may be obtained.

Further, when the electrode rollers 61 and 62 are reversed, a brush (not shown) abuts on each peripheral surface of the electrode rollers 61 and 62, and the peripheral surface (surface) of the electrode rollers 61 and 62 is cleaned (cleaning operation). .. At this time, the guide member 65 is retracted to the upper left position with respect to the front upper position of the electrode rollers 61 and 62, so that the uncrushed grains are prevented from falling from the electrode rollers 61 and 62. It doesn't become.

The bottom surface of the roller accommodating space in which the electrode rollers 61 and 62 are accommodated is open. Therefore, the grains received from the receiving port 42 into the sensor case 41 do not collect in the roller accommodating space except on the electrode rollers 61 and 62, and are provided below the moisture sensor 32 from the roller accommodating space. It is returned to the inside of the Glen tank 5 through the return passage 66 (see FIG. 4).

<Electrical composition of combine>
FIG. 6 is a block diagram showing a main part of the electrical configuration of the combine 1.

A control device 71 is mounted on the combine 1 in order to control the operation of the moisture sensor 32. The control device 71 is configured to include a microcontroller unit (MCU: Micro Controller Unit), and the microcontroller unit includes, for example, a non-volatile memory such as a CPU and a flash memory, and volatileness such as a DRAM (Dynamic Random Access Memory). It has a built-in memory.

In addition to the value (detection signal) output from the moisture sensor 32, the on / off signal of the main key switch 72 and the detection signal of the grain culm sensor 73 are input to the control device 71. The main key switch 72 is a switch that is turned on / off by the user inserting the key into the key cylinder and operating the combine 1 at the start (start) and end of the operation of the combine 1. The grain culm sensor 73 is a sensor provided in the reaping device 7 to detect the presence of the culm in the reaping device 7. The grain sensor 73 outputs an on-level detection signal when the culm is present in the reaping device 7, and outputs an off-level detection signal when the culm is not present in the reaping device 7.

<Sensor drive control>
FIG. 7 is a flowchart showing the flow of drive control of the moisture sensor 32.

When the main key switch 72 is turned on, the control device 71 starts controlling the drive (operation) of the moisture sensor 32. Drive control of the moisture sensor 32 is continued until the main key switch 72 is turned off.

In the drive control of the moisture sensor 32, the DC motor of the moisture sensor 32 is controlled in response to the turning on of the main key switch 72, and the electrode rollers 61 and 62 are reversed over a predetermined normal time (. Step S1). As a result, the moisture sensor 32 performs a cleaning operation over a normal time. The cleaning operation cleans the peripheral surfaces of the electrode rollers 61 and 62.

After that, it is determined whether or not the harvesting device 7 and the threshing device are operating (on) (step S2). When the harvesting device 7 and the threshing device are not operating (OFF) (NO in step S2), the drive control of the moisture sensor 32 does not proceed until the harvesting device 7 and the threshing device are activated.

When it is determined that the reaping device 7 and the threshing device are operating (YES in step S2), the electrode rollers 61 and 62 are reversed over a normal time. As a result, the moisture sensor 32 performs a cleaning operation over a normal time.

When the normal time has elapsed from the start of the cleaning operation, the electrode rollers 61 and 62 are rotated in the normal direction for a predetermined time (step S4). The predetermined time is set to the time required for the guide member 65 arranged at the left front upper position of the electrode rollers 61, 62 to move to the front upper position of the electrode rollers 61, 62. Therefore, when the electrode rollers 61 and 62 are rotated forward for a predetermined time, the guide member 65 moves from the position on the upper left front side of the electrode rollers 61 and 62 to the position on the upper front side of the electrode rollers 61 and 62.

After that, it is determined whether or not the detection signal of the grain culm sensor 73 is on level (step S5). While the detection signal of the grain sensor 73 is off level (NO in step S5), the drive control of the moisture sensor 32 does not proceed.

When the grain enters the cutting device 7 and the detection signal of the grain sensor 73 is turned on level (YES in step S5), the electric resistance value between the electrode rollers 61 and 62 is detected, and the electric resistance value is determined from the electric resistance value. The presence or absence of grains (crop) on the electrode rollers 61 and 62 is determined (step S6). When grains are present on the electrode rollers 61 and 62, even if the grains are not crushed, there is no grain on the electrode rollers 61 and 62 and the electric resistance value between the electrode rollers 61 and 62 is high. different. Therefore, the presence or absence of grains on the electrode rollers 61 and 62 can be determined from the electrical resistance values between the electrode rollers 61 and 62.

When there are no grains on the electrode rollers 61 and 62 (NO in step S6), it is determined again whether or not the detection signal of the grain sensor 73 is on level (step S5).

When the grains are placed on the electrode rollers 61 and 62 and it is determined that the grains are on the electrode rollers 61 and 62 (YES in step S6), the electrode rollers 61 and 62 are rotated forward and the electrode rollers 61, The electric resistance value between the electrode rollers 61 and 62 at the time of crushing the grain by 62 is detected, and the value of the water content contained in the grain is obtained from the electric resistance value. That is, the moisture sensor 32 performs a detection operation for detecting the electric resistance value between the electrode rollers 61 and 62 at the time of crushing the grain in order to measure the amount of water contained in the grain.

When the water content of the grain is measured, the electrode rollers 61 and 62 are reversed over a normal time (step S8). As a result, the moisture sensor 32 performs a cleaning operation over a normal time.

After the cleaning operation of the moisture sensor 32 is completed, it is determined again whether or not the cutting device 7 and the threshing device are operating (on) (step S2), and the cutting device 7 and the threshing device are operating. If there is (YES in step S2), the processing after step S3 described above is executed. As a result, the water content of the grains is periodically measured while the harvesting device 7 and the threshing device are operating.

<Action effect>
As described above, by the drive control of the moisture sensor 32, the grain is cut and the grain is removed from the grain, the presence of the grain is detected by the grain sensor 73, and the grain is present in the moisture sensor 32. In this state, the moisture sensor 32 performs a detection operation for measuring the moisture content of the grain. As a result, it is possible to prevent the moisture sensor 32 from performing the detection operation in the state where the grain is not present in the moisture sensor 32.

Further, after measuring the water content of the grain, the water sensor 32 performs a cleaning operation. As a result, it is possible to prevent the moisture sensor 32 from being unnecessarily cleaned even though the moisture content of the grains has not been measured.

Therefore, it is possible to efficiently perform a series of operations including cutting the grain culm, threshing from the grain culm, measuring the water content of the grain, and cleaning the water sensor 32.

Further, before the detection operation of the moisture sensor 32, the moisture sensor 32 performs a cleaning operation. As a result, the water content of the grains can be measured while the electrode rollers 61 and 62 of the water sensor 32 are in a clean state. Therefore, the water content of the grain can be measured accurately.

<Modification example>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other embodiments.

For example, in the drive control shown in FIG. 7, after the on-level of the detection signal of the grain sensor 73 is confirmed (YES in step S5), the electric resistance value between the electrode rollers 61 and 62 is increased on the electrode rollers 61 and 62. It was determined that the presence or absence of grains in the above was determined (step S6). Instead, as shown in FIG. 8, after a certain time has passed from the start of the reaping device 7 and the threshing device after the on-level of the detection signal of the grain culm sensor 73 is confirmed (YES in step S5). Whether or not it is determined (step S61), and when a certain time has passed (YES in step S61), the water content contained in the grain may be measured (step S7). After a certain period of time has passed from the start of the cutting device 7 and the threshing device, the cutting of the grain by the cutting device 7 and the threshing from the grain by the threshing device proceed to some extent, and the grains are present on the electrode rollers 61 and 62. Can be estimated.

Further, as described in parentheses in step S61 shown in FIG. 8, after the on-level of the detection signal of the combine harvester sensor 73 is confirmed (YES in step S5), the reaping device 7 and the threshing device are started. It may be determined from the above whether or not the combine 1 has traveled a certain distance (step S61), and when the combine 1 has traveled a certain distance (YES in step S61), the amount of water contained in the grains may be measured. (Step S7). Even when the combine 1 travels a certain distance from the start of the harvesting device 7 and the threshing device, the harvesting device 7 cuts the grain and the threshing device, as in the case where a certain time has passed from the starting of the harvesting device 7 and the threshing device. It can be estimated that threshing from the grain has progressed to some extent and grains are present on the electrode rollers 61 and 62.

In FIG. 8, the steps corresponding to each step shown in FIG. 7 are assigned the same step numbers as those steps, and the same step numbers are assigned to the steps to be processed in the steps. The explanation is omitted.

Further, it is said that the combine 1 is provided with a grain culm sensor 73 for detecting the presence of a grain culm in the reaping device 7, but instead of the grain culm sensor 73, as shown by a two-point chain line in FIG. , The stock origin sensor 74 for detecting the stock origin of the grain culm may be provided.

In addition, various design changes can be made to the above-mentioned configuration within the scope of the matters described in the claims.

1: Combine 5: Glen tank 7: Cutting device 32: Moisture sensor 61: Electrode roller 62: Electrode roller 71: Control device 73: Gram culm sensor

Claims (5)

A cutting device that cuts the culm planted in the field,
A threshing device that threshes the culm cut by the cutting device,
A grain tank for storing grains separated from the culm by the threshing device, and
A moisture sensor that is provided to receive the grains discharged into the grain tank, outputs a detection value according to the water content of the grains by the detection operation, and performs self-cleaning by the cleaning operation.
While the reaping device and the grain removing device are operating, the moisture sensor is operated to detect the moisture sensor, and the moisture content of the grain is obtained from the detected value of the moisture sensor to measure the moisture content. A combine, including a control device that causes the moisture sensor to perform the cleaning operation in response to the termination. The moisture sensor includes a pair of electrode rollers, and in the detection operation, the pair of electrode rollers rotate in a normal direction in a direction in which grains are caught between the electrode rollers, and the grains are formed between the electrode rollers. Is crushed, the electric resistance value between the electrode rollers at the time of the crushing is detected, and the value corresponding to the amount of water contained in the grain is output. In the cleaning operation, the pair of electrode rollers are reversed. The combine according to claim 1, wherein the surface of the electrode roller is cleaned. The combine according to claim 1 or 2, wherein the control device operates the moisture sensor for the detection operation after confirming the presence of grains in the moisture sensor. Further including a culm sensor, which detects the presence of culm in the reaping device,
The combine according to any one of claims 1 to 3, wherein the control device causes the moisture sensor to perform the detection operation after the presence of the culm is detected by the culm sensor. The combine according to any one of claims 1 to 4, wherein the control device causes the moisture sensor to perform the cleaning operation before the moisture sensor is operated for the detection.

Images