JP2022012003A - Combine harvester - Google Patents

Abstract

A combine harvester capable of detecting an abnormality in the operation of a moisture sensor and resolving the abnormality is provided. A motor drive current supplied to a DC motor for rotating the electrode roller of the moisture sensor is detected in order to detect a roller lock abnormality in which the electrode roller of the moisture sensor does not rotate well. Then, it is determined whether or not the motor drive current is greater than a predetermined threshold (S11). If it is determined that the motor drive current is greater than the threshold (S11: YES), the electrode roller is stopped (S12). Then, if the electrode roller was rotating forward before stopping (S13: YES), the DC motor is controlled to rotate the electrode roller in reverse for a predetermined normal time (S14). [Selection drawing] Fig. 8

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.

An object of the present invention is to provide a combine capable of detecting an abnormality in the operation of a moisture sensor and eliminating the abnormality.

In order to achieve the above object, the combine according to the present invention includes a pair of electrode rollers, and the pair of electrode rollers rotate forward in the direction in which grains are caught between the electrode rollers, and the pair of electrode rollers rotates between the electrode rollers. A moisture sensor that crushes grains, performs a detection operation to detect the electric resistance value between the electrode rollers at the time of crushing, and performs a cleaning operation to clean the surface of the electrode rollers by reversing the pair of electrode rollers, and moisture. The control device includes a control device for controlling the operation of the sensor, and the control device makes a determination for detecting an abnormality of the moisture sensor during the rotation of the pair of electrode rollers, and the abnormality of the moisture sensor is detected by this determination. In this case, in order to eliminate the abnormality, the moisture sensor is operated to eliminate the abnormality.

According to this configuration, the abnormality of the moisture sensor can be detected by making a determination for detecting the abnormality of the moisture sensor during the rotation of the pair of electrode rollers of the moisture sensor. When an abnormality of the moisture sensor is detected, the abnormality can be eliminated by the abnormality elimination operation of the moisture sensor.

The control device may determine whether or not the drive current of the motor that rotates the pair of electrode rollers exceeds the threshold value, and may detect the abnormality of the moisture sensor by determining that the threshold value is exceeded. By this method, it is possible to detect an abnormality in which the electrode roller does not rotate well due to the grain sticking to the electrode roller.

Then, when the control device detects an abnormality during the normal rotation of the pair of electrode rollers by the method, the control device can stop the pair of electrode rollers and then clean the moisture sensor as an abnormality elimination operation. preferable. As a result, it is possible to eliminate the abnormality due to the removal of the grain adhering to the electrode roller. In addition, it is possible to eliminate the abnormality by removing foreign substances such as cut straw caught between the electrode rollers.

Further, when the control device detects an abnormality during the reversal of the pair of electrode rollers by the method, the control device may stop the pair of electrode rollers and issue an abnormality alarm.

The control device may determine whether or not the electric resistance value between the electrode rollers during the cleaning operation is an abnormal value, and detect the abnormality of the moisture sensor based on the determination that the electric resistance value is an abnormal value. By this method, it is possible to detect an abnormality (roller clogging) in which grains are attached to the electrode rollers without falling off from the electrode rollers.

When the control device detects an abnormality during the cleaning operation over a normal time by the method, it is preferable that the control device continues the cleaning operation for a longer time than the normal time as the abnormality eliminating operation. As a result, it is possible to eliminate the abnormality by removing the grain from the electrode roller.

Further, the control device may issue an abnormality alarm when the abnormality of the moisture sensor is detected a plurality of times.

According to the present invention, it is possible to detect an abnormality in the operation of the moisture sensor and eliminate the abnormality.

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 the flow of the drive control of a moisture sensor. It is a flowchart which shows the flow of the 1st abnormality elimination processing. It is a flowchart which shows the flow of the 2nd abnormality elimination processing.

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 (the electrode rollers 61 and 62 are reversed (). 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.

<First abnormality resolution processing>
FIG. 8 is a flowchart showing the flow of the first abnormality elimination process.

For example, when a foreign substance such as a piece of straw, which is a piece of straw, enters the sensor case 41 of the moisture sensor 32 and the foreign substance gets caught between the electrode rollers 61 and 62, the electrode rollers 61 and 62 are satisfactorily used. An abnormality that does not rotate (hereinafter referred to as "roller lock") may occur. Further, if the crushed grains are left in a state of being attached to the electrode rollers 61 and 62, the grains may adhere to the electrode rollers 61 and 62 and roller lock may occur.

Therefore, the control device 71 executes the first abnormality elimination process in parallel with the drive control of the moisture sensor 32 described above. The first abnormality resolving process is a process of detecting the roller lock and canceling the roller lock when the roller lock is detected.

In the first abnormality elimination process, first, a determination for detecting the roller lock is performed. That is, in order to detect the roller lock, the motor drive current supplied to the DC motor that rotates the electrode rollers 61 and 62 of the moisture sensor 32 is detected. Then, it is determined whether or not the motor drive current is larger than a predetermined threshold value (step S11). When the motor drive current is larger than the threshold value, it means that the rotational resistance of the electrode rollers 61 and 62 is large and the electrode rollers 61 and 62 are not rotating well. Therefore, the determination as to whether or not the motor drive current is larger than the threshold value is a determination for detecting the roller lock, and when the motor drive current is larger than the threshold value, it can be determined that the roller lock has occurred.

When it is determined that the motor drive current is larger than the threshold value (YES in step S11), the supply of the motor drive current to the DC motor is stopped, and the electrode rollers 61 and 62 are stopped (step S12).

Then, it is determined whether the electrode rollers 61 and 62 have rotated forward or reversed before stopping (step S13).

When the electrode rollers 61 and 62 are rotating forward before stopping (YES in step S13), the DC motor is controlled and the electrode rollers 61 and 62 are reversed for a predetermined normal time (step S14). .. As a result, the moisture sensor 32 performs a cleaning operation for a normal time as an abnormality eliminating operation for releasing the roller lock. Since the peripheral surfaces of the electrode rollers 61 and 62 are cleaned by the cleaning operation, there is a possibility that the roller lock due to the crushed grains adhering to the electrode rollers 61 and 62 may be eliminated. Further, the roller lock caused by biting between the electrode rollers 61 and 62 may be canceled by reversing the electrode rollers 61 and 62.

On the other hand, when the electrode rollers 61 and 62 are reversed before stopping (NO in step S13), that is, when the moisture sensor 32 is in the cleaning operation, there is no way to release the roller lock, so that an abnormality occurs. Is issued to the user in order to notify the user (step S15).

<Second abnormality resolution processing>
FIG. 9 is a flowchart showing the flow of the second abnormality elimination process.

For example, if the grain contains a large amount of water, an abnormality may occur in which the crushed grain remains attached to the electrode rollers 61 and 62 (hereinafter referred to as “roller clogging”). .. In this abnormal state, when the next measurement of the water content of the grain is performed, it may not be possible to accurately measure the water content.

Therefore, the control device 71 executes the second abnormality elimination process in parallel with the drive control of the moisture sensor 32 described above. The second abnormality clearing process is a process of detecting roller clogging, and when the roller clogging is detected, the roller clogging is cleared.

In the second abnormality elimination process, first, a determination for detecting roller clogging is performed. That is, in order to detect the roller clogging, the electric resistance value between the electrode rollers 61 and 62 is detected during the reversal of the electrode rollers 61 and 62 of the moisture sensor 32, that is, during the cleaning operation of the moisture sensor 32. Then, it is determined whether or not the detected value is an abnormal value (step S21). When grains are attached to the electrode rollers 61 and 62, a current flows between the electrode rollers 61 and 62 through the grains, so that the electrodes are compared with the case where grains are not attached to the electrode rollers 61 and 62. It shows an abnormal value in which the detected value of the electric resistance value between the rollers 61 and 62 is greatly reduced. Therefore, the determination of whether or not the detected value of the electric resistance value between the electrode rollers 61 and 62 is an abnormal value is a determination for detecting the roller clogging, and the electric resistance value between the electrode rollers 61 and 62 is determined. If it is an abnormal value, it can be determined that the roller is clogged.

When the detected value of the electric resistance value between the electrode rollers 61 and 62 is an abnormal value (YES in step S21), the electrode rollers 61 and 62 are reversed for a longer time than the normal time (step S22). As a result, the moisture sensor 32 performs a cleaning operation longer than usual as an abnormality eliminating operation for clearing the roller clogging. By performing the cleaning operation for a long time, grains may be removed from the peripheral surfaces of the electrode rollers 61 and 62, and the roller clogging may be eliminated.

After that, it is determined whether or not the roller clogging has occurred a plurality of times (step S23). If the roller clogging has not occurred a plurality of times (NO in step S23), it is determined again whether or not the detected value of the electric resistance value between the electrode rollers 61 and 62 is an abnormal value (step S21).

Then, if the roller clogging occurs a plurality of times, the roller clogging is detected multiple times, and the cleaning operation longer than usual is performed a plurality of times, there is a high possibility that the roller clogging will not be cleared. , An abnormality alarm is issued in order to notify the user of the occurrence of an abnormality (step S24).

<Action effect>
As described above, the abnormality of the moisture sensor 32 can be detected by making a determination for detecting the abnormality (roller lock, roller clogging) of the moisture sensor 32. When an abnormality of the moisture sensor 32 is detected, the abnormality can be eliminated by the abnormality elimination operation of the moisture sensor 32.

<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 order to detect the roller lock, it is determined whether or not the motor drive current supplied to the DC motor that rotates the electrode rollers 61 and 62 of the moisture sensor 32 is larger than a predetermined threshold value. The determination for detecting the roller lock is not limited to this, and for example, when the rotation speed of the DC motor that rotates the electrode rollers 61, 62 or the electrode rollers 61, 62 can be detected, the detected rotation thereof. It may be a determination as to whether or not the number is less than a predetermined threshold.

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 32: Moisture sensor 61, 62: Electrode roller 71: Control device

Claims (5)

A pair of electrode rollers are provided, and the pair of electrode rollers rotate in a normal direction in a direction in which grains are caught between the electrode rollers to crush the grains between the electrode rollers, and the electrodes at the time of the crushing. A moisture sensor that performs a detection operation to detect the electrical resistance value between the rollers and cleans the surface of the electrode rollers by reversing the pair of electrode rollers.
Including a control device for controlling the operation of the moisture sensor.
The control device makes a determination for detecting an abnormality in the moisture sensor during the rotation of the pair of electrode rollers, and when an abnormality in the moisture sensor is detected by this determination, the abnormality is eliminated in order to eliminate the abnormality. A combine that operates the moisture sensor to eliminate abnormalities. The control device determines whether or not the drive current of the motor that rotates the pair of electrode rollers exceeds the threshold value, detects the abnormality of the moisture sensor based on the determination that the threshold value is exceeded, and detects the abnormality of the moisture sensor. The combine according to claim 1, wherein when an abnormality is detected during the normal rotation of the pair of electrode rollers, the moisture sensor is operated for cleaning after stopping the pair of electrode rollers as the abnormality elimination operation. .. The combine according to claim 2, wherein when the control device detects an abnormality during the reversal of the pair of electrode rollers due to the cleaning operation, the control device stops the pair of electrode rollers and issues an abnormality alarm. The control device determines whether or not the electric resistance value between the electrode rollers during the cleaning operation is an abnormal value, detects an abnormality in the moisture sensor based on the determination that the electric resistance value is an abnormal value, and detects an abnormality in the moisture sensor for a normal time. The combine according to any one of claims 1 to 3, wherein when an abnormality is detected during the cleaning operation, the cleaning operation is continued for a longer time than the normal time as the abnormality resolving operation. The combine according to claim 4, wherein the control device issues an abnormality alarm when the abnormality of the moisture sensor is detected a plurality of times.

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