JP2019024397A - Universal combine - Google Patents

Abstract

To grasp a grain culm state immediately before a raking reel and control lifting/lowering of the raking reel.SOLUTION: A universal combine is provided with a reaping pretreatment device 4 for harvesting grain culm in a field before a traveling machine body frame 1. The combine is provided with a raking reel 30 to a frame unit of the reaping pretreatment device 4 through a lifting/lowering device 32, is provided with a grain culm detection sensor 38 for monitoring the planting grain culm at the front side of the raking reel 30 in the reaping pretreatment device 4, and is provided with a control unit C for operating and controlling the lifting/lowering device 32 in order to lift and lower the raking reel 30 based on detection results of the grain culm detection sensor 38. When the grain culm detection sensor 38 for monitoring a grain culm planting state detects the long culm, the raking reel 30 is made to come up, and the raking reel 30 is controlled to come down in the short culm.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a general-purpose combiner, and relates to a lift control device for a take-up reel.

  In the conventional general harvesting pre-treatment device for harvesting, the left and right reel tilting hydraulic cylinders are interposed between the left and right side walls of the platform for collecting the harvested cereals and the left and right bearings of the scraping reel to raise and lower the scraping reel. It is configured to be able to be tilted or tilted to the left and right, and a culm sensor for detecting the cereal planting state is arranged on the machine to monitor the cereal planting state in front of the machine. If standing upright, the left and right hydraulic cylinders are extended to raise the take-up reel, and if lying down, the left and right hydraulic cylinders are contracted to lower the take-up reel (see, for example, Patent Document 1).

JP-A-11-155340

  According to the configuration of Patent Document 1, since the scraping reel is automatically adjusted to an appropriate height while monitoring the planting state of the cereals in front of the machine body, the burden on the operator during work can be reduced. However, since the culm sensor is arranged at the upper front end of the cabin and detects the culm in front of the fuselage, the culm state immediately before the take-in reel cannot be confirmed as a blind spot.

  The present invention solves the above-described problems, accurately grasps the cereal state immediately before the take-up reel, and attempts to perform the take-up reel lifting control based on the result.

  In order to solve the above problems, the present invention has taken the following technical means.

The invention according to claim 1 is a general-purpose combine that provides a pre-cutting processing device (4) for harvesting cereals in the field in front of the traveling machine body frame (1).
A scraping reel (30) is provided on the frame part of the pre-cutting processing device (4) via an elevating device (32), and the front side of the picking reel (30) is planted in the pre-cutting processing device (4). A cereal detection sensor (38) for monitoring cereals is provided, and the lifting device (32) is operated and controlled to raise and lower the scraping reel (30) based on the detection result of the cereal detection sensor (38). A control unit (C) is provided.

  If comprised in this way, the culm detection sensor 38 which monitors the culm planting state will raise the pick-up reel 30 if a long cocoon is detected, and will control to lower the pick-up reel 30 in the case of a short culm.

  According to a second aspect of the present invention, in the first aspect of the present invention, the cereal detection sensor (38) is cerealed by a light irradiation, laser or ultrasonic wave transmitting unit (38a) and a receiving unit (38b). It was set as the structure which determines the presence or absence of.

  According to a third aspect of the present invention, in the second aspect of the present invention, a pair of left and right reel arms (31, 31) are provided on the frame portion of the pre-cutting processing device (4) so as to be pivotable up and down. The scraping reel (30) is pivotally supported on a reel arm (31, 31), the lifting device (32) is connected to rotate the reel arm (31, 31) up and down, and the reel arm (31, 31) is connected. 31) is provided with a transmitting part (38a) of the cereal detection sensor (38), and on the other side is provided with a receiving part (38b) of the cereal detection sensor (38). The lifting device (32) is controlled on the basis of the detection result of the presence or absence of a heel.

  If comprised in this way, since the grain detection sensor 38 which monitors a grain establishment state is provided in the reel arms 31 and 31, it can detect the presence or absence of the plantation grain immediately before the pick-up reel 30.

  The invention according to claim 4 is the invention according to claim 3, wherein the reel arm (31, 31) has a front portion of the reel arm (31, 31) via a sensor arm (39, 39). The transmitter (38a) and the receiver (38b) are provided to face each other, and the vertical height of the sensor arm (39, 39) is provided to be adjustable with respect to the reel arm (31, 31).

  If comprised in this way, the action height of the cereal detection sensor 38 can be adjusted according to a grain kind and a crop growth condition, and it is convenient.

  According to the present invention, by setting the culm detection sensor 38 on the front side of the picking reel, the planted culm situation immediately before the cutting pretreatment device 4 or the picking reel 30 can be detected, and it is accurate. Ascending / descending control of the scraping reel 30 can be performed.

It is a left view of a combine. It is a top view of a combine. It is a top view of a cutting pretreatment apparatus. It is a front view of a take-in auger. It is a principal part side view of a cutting pretreatment apparatus. (A) Perspective view of reel arm equipped with cereal detection sensor, (B) Perspective view of adjustment plate. It is a control block diagram. It is a flowchart. It is a flowchart. (A) Side view of reel tine, (B) Front view thereof. It is an action side view of the conventional reel tin. It is a front view of an improved reel tine. (A) It is a disassembled perspective view which shows the base mounting structure of a hydraulic cylinder, (B) It is a side view which shows an assembly state. It is a side view which shows the upper connection structure of a hydraulic cylinder.

  Embodiments of a general purpose combine according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the combine is provided with a traveling device 2 composed of a pair of left and right crawlers for traveling on the soil surface on the lower side of the body frame 1, and threshing / sorting on the upper side of the body frame 1. A threshing device 3 is provided, and a pre-cutting processing device 4 for harvesting cereal grains in the field by being positioned on the front side of the threshing device 3 is provided in the machine body frame 1 so as to be capable of moving up and down. The grain threshed and selected by the threshing device 3 is stored in a Glen tank 5 provided on the right side of the threshing device 3, and the stored grain is externally provided by a discharge cylinder 6 including a whipping cylinder and a transverse feed cylinder. Is discharged. In addition, a steering unit 7 on which a pilot rides is provided on the front side of the Glen tank 5.

  The pre-cutting processing device 4 includes a feeder house 8, an auger device 9, a cutting blade device 10, and a scraping device 11.

  The feeder house 8 is a device for transferring rice straws such as rice, wheat, soybeans and buckwheat conveyed to the left part of the auger device 9 to the threshing device 3, and is provided between the auger device 9 and the threshing device 3. Yes.

  At the rear of the frame 13 of the feeder house 8, a rotating shaft 14 for transmitting the rotation of the engine is provided horizontally, and at the front of the frame 13, a driven shaft 15 is provided horizontally. A chain 16 is wound around each of the pair of sprockets 14A attached to the rotating shaft 14 and the pair of sprockets 15A attached to the driven shaft 15. The pair of left and right chains 16 have a predetermined interval. A plate (not shown) for conveying the cereals is added.

  As shown in FIGS. 3 and 4, the auger device 9 is a device that gathers the grains and the like scraped by the scraping device 11 to the left part of the auger device 9 and transfers them to the feeder house 8. The width of the combine is substantially the same as the width in the left-right direction.

  The auger device 9 includes an auger frame 17 and a scraping auger 18 provided on the auger frame 17. The auger frame 17 is substantially composed of a left wall 17A, a right wall 17B, a rear wall 17C connecting the rear portions of the left wall 17A and the right wall 17B, and a lower wall 17D connecting the rear lower portions of the left wall 17A and the right wall 17B. It is formed in a bucket shape. In addition, a transfer port 19 for transferring the cereal to the feeder house 8 is opened at the left part of the rear wall 17C.

  In the side view, the upper surfaces 20 of the left wall 17A and the right wall 17B are formed so as to be inclined rearward, and the lower surfaces 21 of the left wall 17A and the right wall 17B are inclined upwardly parallel to the upper surface 20 and then cut. After extending substantially horizontally from the upper position of the blade device 10 toward the rear side, it is formed in a substantially arc shape from the lower position of the take-up auger 18.

  The take-up auger 18 includes a rotary shaft 22 rotatably mounted on the left wall 17A and the right wall 17B of the auger frame 17, and a cylindrical tube body 23 supported by the rotary shaft 22. On the left side of the outer peripheral surface of the cylindrical body 23, a conveying spiral 23 </ b> A that is tilted in a direction to gather the grains and the like scraped by the scraping device 11 to the front side of the transfer port 19 is fixed. A front / rear opening 23 </ b> B through which a plurality of the scribing fingers 24 can freely enter and exit is opened at a front portion of the transfer port 19 in the right part of the outer peripheral surface.

  The rotation of the engine transmitted to the sprocket 15A of the driven shaft 15 of the feeder house 8 is transmitted to the sprocket 22A attached to the left end portion of the rotating shaft 22 via a chain (not shown) to rotate the take-up auger 18. .

  The cutting blade device 10 is a device for cutting stock sources such as cereals scraped into the auger device 9 by the scraping device 11 and cereals sown in the auger device 9 by the post-weeding body 28 described later. The auger frame 17 is provided at the front end of the lower wall 17D.

  The cutting blade device 10 includes a finger-like fixed blade 25 having a narrow blade width and a long blade length, and a triangular movable blade 26 having a wide blade width and a short blade length. The movable blade 26 slides in the left-right direction in a groove formed between the cutting blade plate 27 fixed to the rear portion of the fixed blade 25 and the fixed blade 25. Thereby, many stock holders of cereals can be hold | maintained and the stock company of cereals can be cut | disconnected efficiently.

  The rotation of the engine transmitted to the sprocket 15A of the driven shaft 15 of the feeder house 8 is transmitted to the movable blade 26 of the cutting blade device 10 via a conversion device (not shown) and moves the movable blade 26 in the left-right direction. .

  The weed bodies 28 are respectively fixed to the front end portions of the left frame 29A and the right frame 29B from the lower portions of the left wall 17A and the right wall 17B of the auger frame 17 toward the front side.

  As shown in FIGS. 1 and 2, the rake device 11 is a device that rakes overlyed cereals, low cereals such as soybeans and buckwheat, and high cereals such as oil and rape into the auger device 9. Yes, provided on the upper side of the auger device 9 and formed to have substantially the same width as the width of the auger device 9 in the left-right direction.

  The take-up device 11 includes a take-up reel 30 and a pair of left and right reel arms 31 that move the take-up reel 30 up and down. The rear part of the reel arm 31 is rotatably fixed to the rear wall 17C of the auger frame 17, and an intermediate part of the reel arm 31 is connected to a lifting device 32 such as a hydraulic cylinder that moves the reel arm 31 up and down. A rotating shaft 33 on which the take-up reel 30 is mounted is installed at the front portion of the reel arm 31. In the hydraulic cylinder as the lifting device 32, the base side cylinder portion 32 a is connected to the frame portion (the auger frame 17 or the cylindrical body 37) of the pre-cutting processing device 4, and the upper end piston portion 32 b is connected to the reel arm 31. It is the structure connected with the reinforcement board 31a added to an intermediate | middle bending part.

  In a side view, the take-up reel 30 is formed in a substantially hexagonal shape, and a tine support rod 34 is provided at each of the six corners, and the tine support rod 34 is spaced at a predetermined interval in the left-right direction. A plurality of reel tines 35 are suspended.

  The rotation of the engine transmitted to the sprocket 15A attached to the driven shaft 15 of the feeder house 8 is caused by the rotation shaft 33 via a rotation shaft 36 provided in the rear wall 17C of the auger frame 17 extending in the left-right direction. It is transmitted to a sprocket (not shown) attached to the right end, and the take-up reel 30 is rotated.

  By the way, when the pre-cutting processing device 4 is in the lowered posture of the working posture, it is desirable that the height of the scraping reel 30 is changed in accordance with the culm length (floor culm length) and the degree of lodging. By raising the scraping reel 30 in the case of long grain straws and lowering in the case of short grain straws, it is possible to efficiently carry out the grain straw picking by the reel tines 35 in an appropriate scratch load state. Because. For this reason, the reel arm 31 is connected to be freely rotatable up and down around the support shaft 31a of the rear wall 17C, and is configured such that the vertical height of the scraping reel 30 can be changed and adjusted by the expansion and contraction of the elevating device 32. .

  Further, a cereal detection sensor 38 is mounted in front of the take-up reel arm 31. A pair of left and right sensor arms 39 are connected to the front ends of the pair of left and right reel arms 31 so as to be vertically rotatable with respect to the reel arm 31, and a crop detection sensor such as a photoelectric sensor or a laser sensor is connected to the tip of the sensor arm 39. 38 is installed. The crop detection sensor 38 includes a pair of a transmission unit 38a (or a light emitting unit) and a reception unit 38b (or a light receiving unit), and is connected to a signal processing unit 40 that processes a reception signal and outputs it to a control unit described later. . The transmitter 38a is attached to one of the pair of sensor arms 39, and the receiver 38b is provided on the other sensor arm 39 so as to face the transmitter 38a. The control unit C is configured to output a transmission signal at a predetermined timing via the signal processing unit 40 and receive a reception signal from the reception unit 38b via the signal processing unit 40. Since the transmission unit 38a and the reception unit 38b face each other in a horizontal state, when the transmission signal of the transmission unit 38a is blocked by the rice straw in the field, the transmission signal is not received by the reception unit 38b. It is possible to detect the presence of cereals. In a state where this transmission signal is received, it is determined that there is no culm between the culm detection sensors 38 and the position of the culm detection sensor 38 is higher than the culm height.

  And the said grain candy detection sensor 38 is set as the structure which carries out the expansion-contraction control of the said raising / lowering apparatus 32 based on the detection of the target grain spike tip part position. By comprising in this way, in the case of a long grain rice cake, the scraping reel 30 can be raised, and in the case of a short grain rice cake, it can be lowered, and the rice cake scraping by the reel tine 35 is in an appropriate scratch load state. Can be done efficiently.

  In addition, it is set as the structure which can set the height position of the cereal detection sensor 38 previously so that it may be in the said appropriate pick-up load state. That is, the vertical adjustment means 41 is interposed between the base of the sensor arm 39 provided with the grain detection sensor 38 and the reel arm 31. The vertical adjustment means 41 is an adjustment plate 42 fixed to the reel arm 31 with a bolt. The sensor arm 39 is connected by a fulcrum shaft 43 so as to be rotatable up and down, and a long hole 42a is formed in the adjustment plate 42, and the vertical inclination angle of the sensor arm 39 with respect to the adjustment plate 42 can be arbitrarily determined by the fastening bolt 44. The sensor arm 39 is configured to be freely changeable in the vertical angle with respect to the reel arm 31. Therefore, the vertical height of the transmitting portion 38a at the tip of the left sensor arm 39 in the figure can be arbitrarily set. For example, in the case of long cereals, a position higher than the standard height position (b) (b), and in the case of short cereals or fallen cereals, a position lower than the standard height position (a) (C) Adjust to each side and fix with bolts. When the bottom of the long hole 42a is reached and fixed, the non-actuated storage state (d) is obtained. The right sensor arm 39 is also configured to be adjustable in the vertical angle, and the height of the receiving unit 38b can be adjusted to a height corresponding to the transmitting unit 38a.

  As shown in FIG. 6B, it is convenient when the sensor arm 39 is adjusted independently on the left and right sides by bending the end of the relay adjustment plate 42 and attaching a scale 42b.

  Next, the operation will be described based on the flowchart of FIG.

  When the combine key switch 37 is turned on, the adjustment lamp 45 that prompts the operator to adjust the height of the cereal detection sensor 38 blinks (S101, 102). The operator adjusts the height of the cereal detection sensor 38 by adjusting the vertical adjustment means 41. When the operator presses the adjusted switch 46 (S103), the adjustment lamp 45 is turned off (S104). When the mowing and threshing operation is started, the control unit C outputs a transmission signal to the cereal detection sensor 38, and the transmission unit 38a emits a laser (S107). The control unit C inputs the reception signal of the reception unit 38b at a preset timing (S108). If it is determined by the input of this received signal that there is a culm, a rising signal is output and the lifting device 32 is extended (S109). The reel arm 31 pivots upward about the base and raises the scraping reel 30 for a preset time or distance (S110). On the other hand, if it is determined in S109 that there is no corn straw, a descending signal is output to shorten the lifting device 32 (S111). The take-up reel 30 is lowered for a preset time or distance.

  The above steps S108 to S111 are repeatedly executed, but the timing is preset by the timer setting (S112, 113). When the key switch is turned off, the mowing and threshing operation is finished, and the take-up reel lifting control is also finished (S115).

  Therefore, it can be set to the height of the scraping reel 30 corresponding to the height of the cereal basket, and an appropriate scraping action by the scraping reel 30 can be realized corresponding to the long punch or short punch.

  Next, on the basis of FIG. 9, the rise start and rise stop determination control of the lifting device 32 will be described. When the control unit C is connected to the take-up reel lifting / lowering control mode selection switch 47 and the frequency setting mode selection switch 48 and both are turned on (S201 to S203), the rising start determination frequency α is set. In some cases, the frequency α ′ set in the past mowing and threshing operation is corrected to the frequency α. The increase start determination frequency α is set or corrected by the increase start determination frequency dial 49 (S204). At the same time, the setting or correction of the frequency β for determining to stop the lifting / lowering device 32 that is rising, that is, extending, is performed by using the frequency dial 50 for determination of rising / stopping (S205). And the control part C inputs and memorize | stores the signal from the receiving part 38b of the said cereal detection sensor 38 (S206). The control unit C inputs the output of the receiving unit 38b at a minute time interval regardless of the presence or absence of cereal, and when the predetermined number m is reached in advance, the number of times cereal is determined (the number of cereal detection determinations) mx. Exceeds the rising start determination frequency α, the lifting device is raised and the lifting device 32 is extended (S207 to S210). The elevating device 32 continues to extend, but the elevating device 32 stops when the elevating device ascending output is stopped. That is, the control unit C updates and stores the signal from the receiving unit 38b of the cereal detection sensor 38 (S211). When the preset number of times n is reached and the number of grains nx is less than the ascent range stop determination frequency β, the lifting device 32 stops (S212 to S214). If the frequency setting mode selection switch 47 is not turned on in S203, the previous frequency α ′, β ′ is adopted, and the lifting / lowering start and lifting / lowering stop control of the lifting / lowering device 32 is performed.

  If the take-up reel lifting / lowering control mode selection switch 46 is not turned on in S202, the take-up reel 30 is raised / lowered manually. For example, the control valve 53 is directly actuated by operating an ascending switch 51 and a descending switch 52 provided on a main transmission lever (not shown), and the elevating device 32 is expanded and contracted.

  Since the height of the culm in the field is not uniform, if the lifting / lowering control is performed for each cereal presence / absence signal by the receiving unit 38b, the lifting / lowering control tends to be frequent, which is not practical. For this reason, as described above, the rising start determination frequency α and the rising stop determination frequency β are set, and the lifting device 32 starts to rise and stops to rise based on the frequency with the culm of the receiver 38b signal. Thus, the above-described drawbacks can be eliminated and smooth raising and lowering control of the reel 30 can be performed. The relationship between the frequencies α and β may be the same or different. Further, the relationship between the reception input setting times m and n by the reception unit 38b may be the same or different.

  Note that the lowering control of the take-up reel 30 can be suppressed by performing the rise / stop decision more quickly than the rise start determination that is normally performed, so that the take-up reel 30 is maintained at a high position and the take-in action is performed. For this reason, if the rise stop determination frequency β is set smaller than the rise start determination frequency α, or n is set smaller than the predetermined number m of signal inputs by the receiving unit 38b. Good.

  The rise start determination frequency α and the rise stop determination frequency β are changed and corrected in accordance with the travel speed V of the vehicle body. Assuming that the detection timing by the receiver 38b is constant when the traveling speed V increases, the detection interval becomes large and the cereal detection range inevitably expands. As a result, the length range of the cereals also increases, and thus the lifting device There is a tendency for the number of up and down operations of 32 to increase. In order to solve this problem due to hunting, when the traveling speed V increases, the frequency α and the frequency β may be set low.

  The raising / lowering control of the take-in reel 30 is executed in association with the operation of the automatic cutting height control for raising / lowering the pre-cutting processing device 4 with respect to the field scene. If it is configured to start simultaneously with this automatic cutting height control operation, it is possible to perform control without waste because both control executions are performed during cutting and threshing. Further, when the cutting reel lifting / lowering control is performed after the cutting height control is performed and a predetermined distance has passed or a certain time has elapsed, the posture of the pre-cutting processing device 4 and the cutting operation of the cutting blade device 10 are settled. Unstable operation and behavior immediately after starting can be prevented.

  In the above embodiment, the vertical adjustment means 41 is configured to be able to adjust the position of the sensor arm 39 along the long hole 42a formed in the adjustment plate 42, but in addition to this, the adjustment plate portion and the fulcrum shaft 43 of the sensor arm 39 It is also possible to employ a configuration in which a braking means is interposed between the two and a brake can be applied by friction after manual adjustment at an arbitrary position. Furthermore, it is good also as a structure which incorporates an electric motor in the fulcrum shaft 43 part and can rotate the sensor arm 39 up and down by the forward / reverse rotation of the electric motor. In this case, the operator can arbitrarily adjust the control unit 7.

  The vertical adjustment means 41 can hold the sensor arm 39 in the stowed posture (d), and can prevent damage due to unexpected collision with other objects during traveling on the road or entering or leaving the warehouse during non-working. . If a storage state detection switch is configured at a position where the storage posture (d) is reached and the reception signal from the culm detection sensor 38 is cut off when the switch is turned on, unexpectedly the scraping reel 30 is Since the lifting operation is not performed, it is safe.

  The improvement of the reel tine 35 will be described with reference to FIGS. The reel tine 35 is formed by one elastic linear body, and is fixed to the tine support rod 34. The upper end U-shaped portion 35a that engages with a fixing bolt, and a wound bullet portion 35b wound in a coil spring shape. The leg portion 35c gradually recedes backward in the traveling direction. The conventional reel tine 35B is formed such that the leg portion 35Bc extends directly downward from the wound bullet portion 35b and then bends backward (imaginary line in FIG. 10). On the other hand, the leg portion 35Aa of the improved reel tine 35A has a lower portion of the wound bullet portion 35Ab that moves forward and a lower portion that curves backward (solid line in the figure). The lower end of the improved reel tine 35A is lower than the lower end of the conventional reel tine 35A. In the case of the conventional reel tine 35, the lower limit of the locus is slightly below the virtual farm scene because it is set to draw a locus that avoids interference with the rear cutting blade device 10 (FIG. 11). The action trajectory of the improved reel tine 35A is lower than the lower end of the conventional trajectory while avoiding interference with the cutting blade device 10, as shown in FIG. improves.

  Next, a configuration for mounting the cylinder portion 32a of the lifting device 32 to the auger frame 17 and a configuration for connecting the piston portion 32b to the reel arm 31 will be described. First, with respect to the connecting structure of the cylinder part 32a, a connecting frame 56 for connecting the base side of the cylinder part 32a via a connecting pin 55 is provided, and this connecting frame 56 is connected to the auger frame 17 or the cylindrical body 23 (the cutting pretreatment device side frame part). ) Is mounted on the pedestal 57 fixed to the vertical frame), and a vertical adjustment means is formed between the connecting frame 56 and the pedestal 57 by a combination of a long hole 58, a fixing bolt 59a and a nut 59b. The raising / lowering range of the take-up reel 30 that is interlocked with the lifting / lowering of the lifting / lowering device 32 can be changed and set, and the raising / lowering range can be arbitrarily set according to the type of grain and the long and short ridges. In FIG. 13, a long hole 58 is formed in the pedestal 57, and the connecting frame 56 is vertically adjusted along the long hole 58 and fixed with fixing bolts 59 a, but the connecting frame 56 side is a long hole. Also good. On the other hand, as shown in FIG. 14, the connecting pin 32c at the tip of the piston 32b is connected to the reinforcing plate 31a of the reel arm 31 with respect to the connecting configuration of the piston 32b and the reel arm 31. In this embodiment, arc-shaped long holes 60 are formed in the reinforcing plate 31a so as to produce a height difference z due to the connection with both ends of the long holes 60, and the raising / lowering range of the reel arm 31 and eventually the take-up reel 30 Can be changed to large or small.

DESCRIPTION OF SYMBOLS 1 Airframe frame 4 Cutting pre-processing apparatus 30 Picking reel 31 Reel arm 32 Lifting apparatus 38 Grain detection sensor 38a Transmitting part 38b Receiving part 39 Sensor arm

Claims (4)

In the general-purpose combine which provides the pre-harvest processing device (4) for harvesting cereals in the field in front of the traveling body frame (1),
A scraping reel (30) is provided on the frame part of the pre-cutting processing device (4) via an elevating device (32), and the front side of the picking reel (30) is planted in the pre-cutting processing device (4). A cereal detection sensor (38) for monitoring cereals is provided, and the lifting device (32) is operated and controlled to raise and lower the scraping reel (30) based on the detection result of the cereal detection sensor (38). General-purpose combine characterized by providing a control unit (C).   The general purpose combine according to claim 1, wherein the cereal detection sensor (38) is configured to determine the presence or absence of cereal by means of a light irradiation, laser or ultrasonic wave transmitter (38a) and a receiver (38b).   A pair of left and right reel arms (31, 31) are provided on the frame portion of the pre-cutting processing device (4) so as to be pivotable up and down, and the scraping reel (30) is pivotally supported on the reel arms (31, 31). The lifting / lowering device (32) is connected to rotate the reel arm (31, 31) up and down, and the transmitting portion (38a) of the cereal detection sensor (38) is connected to one of the reel arms (31, 31). And a receiving unit (38b) of the grain detection sensor (38) is provided on the other side, and the lifting device (32) is controlled based on the result of the presence / absence detection of the grain detection sensor (38). The general purpose combine according to claim 2. Provided at the front part of the reel arm (31, 31) through the sensor arm (39, 39) with the transmitting part (38a) and the receiving part (38b) of the cereal detection sensor (38) facing each other. The general purpose combine according to claim 3, wherein the vertical height of the sensor arm (39, 39) is adjustable with respect to the reel arm (31, 31).

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