JP2006115852A - Combine harvester having reaping height controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combine harvester which stably acts reaping auto crutch, auto lift and auto set functions in a field where the detection values of a reaping height sensor are not stabilized, and normally operates lifting or lowering drive controls for a reaping pretreatment apparatus. <P>SOLUTION: This combine harvester is characterized by disposing an auto lift switch for automatically switching off a reaping crutch, when the reaping pretreatment apparatus is lifted to a constant height, and an auto set switch for automatically switching in the reaping crutch, when the reaping pretreatment apparatus is lowered to a constant height, and carries out lifting or lowering drive controls for the reaping pretreatment apparatus to a reaping portion-set position on the basis of reaping position sensor data, when the reaping height automatic switch is switched off. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combine, and more specifically, a cutting pretreatment device is configured to be movable up and down by a lifting drive means with respect to the front portion of the combine, and the height of the ground between the cutting pretreatment device and a field scene is detected. The present invention relates to a combine configured to drive the lifting drive means up and down by a detection signal from a cutting position sensor that detects a relative height between the cutting height sensor and the combine and the pre-cutting processing device.

  Conventionally, lifting and lowering of the cutting pretreatment device is independent of whether the cutting height automatic switch is ON or OFF, and if the cutting portion is raised without operating the cutting clutch lever, the driving of the cutting portion and the feed chain is stopped. Clutch automatic drive device (hereinafter referred to as “cutting auto clutch”) that drives the cutting unit and the feed chain when the cutting unit is lowered, and the cutting lift provided on the main transmission lever when the work clutch is cutting and engaging. When the switch is ON, the ascending drive device (hereinafter referred to as “auto lift”) that raises the cutting part to the set height, and when the cutting and lowering switch provided on the main transmission lever is ON, Each control of the descent drive device (hereinafter referred to as “auto set”) for lowering to the set height is performed based on the detection data of the cutting height sensor.

  However, if there are a lot of fallen cereals and weeds in wetlands and fields, the reflection of ultrasonic waves is poor, the operation of the cutting height sensor becomes unstable, and the lifting drive control of the pre-cutting device does not function effectively. It was.

  The present invention has been made to solve these problems, and in a field where the detection value of the cutting height sensor is not stable, the cutting auto clutch, the auto lift and the auto set function can be used stably. It is an object of the present invention to provide a combine in which the lifting drive control of the pre-cutting processing device operates normally.

  In order to achieve the above object, the present invention provides a combine cutting height control apparatus as described below. That is, the cutting pretreatment device is configured to be movable up and down with respect to the front part of the combine by a lifting drive means, and the cutting height sensor for detecting the ground height between the cutting pretreatment device and the field scene, the combine and the cutting When the cutting height automatic switch is ON in the cutting height control device in the combine configured to drive the lifting drive means up and down by the detection signal of the cutting position sensor that detects the relative height with the pre-processing device. Based on the cutting height sensor data, and when the cutting height automatic switch is OFF, the raising / lowering drive control of the cutting pretreatment device is executed to the cutting portion setting position based on the cutting position sensor data. It is a combine.

  Further, the cutting pretreatment device is configured to be lifted and lowered by a lifting drive means with respect to the front portion of the combine, and a cutting height sensor for detecting the ground height between the cutting pretreatment device and the field scene, the combine and the cutting In a cutting height control device in a combine configured to drive the lifting drive means up and down by a detection signal from a cutting position sensor for detecting a relative height to the preprocessing device and a grounding type cutting height sensor provided on the weeding body When the work clutch is cut / on and the cut down switch provided on the main transmission lever is ON, the cutting height is based on the grounding type cut height sensor data and the cut down switch is 0FF. When the length switch is ON, the combine is characterized in that the up-and-down drive control of the pre-cutting processing device is executed based on the ground-type cutting height sensor data.

  The cutting pretreatment device is configured to be movable up and down by a lifting drive means with respect to the front part of the combine, and the cutting height sensor for detecting the ground height between the cutting pretreatment device and the field scene, the combine and the cutting pretreatment In a combine configured to drive the lifting drive means up and down by a detection signal of a cutting position sensor that detects a relative height to the device, according to the present invention, in a field condition where the detection value of the cutting height sensor is not stable In addition, the cutting auto clutch, auto lift and auto set functions function stably, and the lifting drive control of the pre-cutting processing device operates normally.

  Next, an embodiment in which the present invention is applied to a combine will be described. FIG. 1 is a side view of a combine (1) having a pair of left and right traveling devices (2) provided with a traveling crawler (2a), FIG. 2 is a plan view of the combine (1), and FIG. FIG. 4 is a plan view, FIG. 5 is a skeleton diagram of power transmission, and FIG. 6 is a functional block diagram of a hydraulic circuit and a control device.

  As shown in FIGS. 1 and 2, a threshing device (3) is mounted on the left side in the direction of travel of the combine (1), and a single-acting hydraulic cylinder (9) is mounted on the front of the combine (1). The cutting pretreatment device (4) that can be moved up and down is disposed. The clipper-type cutting blade device (5) is arranged on the lower side of the lower frame of the pre-cutting processing device (4), and the cereal pulling device (6) for six strips is arranged on the front side. 6) and a cereal conveyance device (8) is arranged between the front end of the feed chain (7) for supplying cereals to the barrel (3a) in the threshing device (3), In front of the lower part of 6), weeds (10) corresponding to six strips protrude. Moreover, the ultrasonic sensor (20) is arrange | positioned toward the field scene on the back side of the grain raising apparatus (6). A cab (11) is arranged on the right front of the combine (1). In the said cereal haul conveying apparatus (8), it conveys while holding the stock base part of the culm caused by the cereal habit raising apparatus (6), and inherits the stock base part to the front end part of the feed chain (7).

  As shown in FIGS. 3 and 4, the base end of a vertically downward tilting lifting cylinder frame (14) having a tip attached to the pre-cutting processing device (4) is fixed to the horizontal cylinder (15), and the horizontal cylinder ( 15) is pivotally supported by a plurality of bearing brackets (16) provided at the front of the combine (1) so that the power from the engine (35) on the combine (1) can be transmitted to the horizontal cylinder (15) and Power is transmitted to each part of the pre-cutting device (4) through the transmission shafts (17) and (19) disposed on the inner diameter part of each of the lifting cylinder frames (14) and the bevel gear body (18). Then, the cutting pretreatment device (4) is driven up and down by the lifting hydraulic cylinder (9) mounted between the middle part of the lifting cylinder frame (14) and the combine (1).

  FIG. 5 is a skeleton diagram showing a power transmission system of a combine. One of outputs from the engine (35) is a bottom conveyor (37) and a vertical conveyor in the grain tank (12) via a clutch (36). Power is transmitted to (38) and then to a screw conveyor (not shown) in the discharge auger (28). The other output from the engine (35) is a continuously variable transmission mechanism using a handling cylinder drive shaft (40), a sorting drive shaft (41), an HST type (two hydraulic motors and two hydraulic pumps) via a power branching mission (39). Power is transmitted to the drive shaft (43) to the travel drive unit (42) and the constant speed rotation drive shaft (44) to the pre-cutting processing device (4). The other output from the engine (35) is to turn on / off the power transmission via the threshing clutch (48a) in the power branching mission (39), and the barrel drive shaft (40) or the sorting drive. A handling cylinder (13) and a processing cylinder (29) through a shaft (41), a first receiving screw conveyor (26a), a tang fan, a second receiving screw conveyor (26b), and a second reducing conveyor (25) ), The waste chain (31), the suction fan (30), and the waste cutter (33).

  On the other hand, from the reaping synchronized drive shaft (45) output from the HST traveling drive unit (42), via the one-way clutch (45a) and the synchronized clutch (46) (which can be transmitted only during the forward rotation of the traveling drive unit). The power is transmitted to the cutting shaft (47) and directly transmitted to the feed chain (7). The power transmission to the pre-cutting processing device (4) is turned ON / OFF via a cutting clutch (49) provided on the cutting shaft (47). To turn on / off the threshing clutch (48a), the tuning clutch (46), the inflow clutch (48), and the cutting clutch (49), turn on / off the clutch actuator such as an electromagnetic solenoid corresponding to each clutch. It is configured to work. The synchronization clutch (46) may be a tension clutch that interrupts power by tensioning / relaxing the belt tension. Therefore, as described later, when vehicle speed synchronization control is prohibited (cancelled), power is transmitted to the cutting shaft (47) via the constant speed rotation drive shaft (44) of the power branching mission (39), and the HST When the rotational speed of the cutting tuned drive shaft (45) output from the traveling drive unit (42) is lower than the rotational speed from the constant speed rotational drive shaft (44), or the reaped synchronous drive shaft (45) moves backward in the combine When rotating in the direction, the one-way clutch (45a) runs idle.

  The main transmission lever (85) for adjusting the swash plate such as each hydraulic pump of the HST traveling drive unit (42) to continuously change the vehicle speed is shown in FIGS. As shown in FIG. 4, when the vehicle is turned back and forth at the side operation portion of the seat (11a) in the cab (11) and moved forward with respect to the neutral position (stop position) in a substantially vertical position, the forward position is reached. As the inclination angle with respect to the vertical increases, the vehicle speed increases. When the vehicle is tilted backward, the vehicle moves backward, and the vehicle speed increases as the tilt angle increases. Further, as shown in FIG. 7B, a cutting lift switch (85b) for adjusting the cutting pretreatment device (4) up and down is provided on the front right side of the knob (85a) of the main transmission lever (85), and a knob ( An automatic lift switch (85c) that automatically turns off the cutting clutch (49) when the pre-cutting device (4) is raised to a certain height on the right side of the driver seat side of 85a), and the pre-cutting device An autoset switch (85d) is provided for automatically turning on the cutting clutch (49) when lowering (4) to a certain height.

  Similarly, the auxiliary speed change lever (86) disposed in the side operation portion of the seat (11a) is an electric motor or the like that operates a mechanical speed change mechanism (not shown) provided in the HST travel drive portion (42). When the auxiliary speed change lever (86) is switched to each position in the road traveling mode, the standard work mode, and the low speed work mode, the microcomputer type control device (controller unit) mounted on the combine ( 70), it is possible to set and hold the output and the rotational speed of the travel drive unit (42) adapted to each work mode within a predetermined range.

  When normal mowing and threshing work is performed while the traveling machine body (1) travels forward (in the low speed work mode and the standard work mode), the inflow clutch (48) in the power branching mission (39) is set. The threshing clutch (48a), the tuning clutch (46), and the mowing clutch (49) are turned on, and the detected values of the fuel injection amount sensor and the vehicle speed sensor are monitored, and the output of the driving unit (42) is turned off. The cutting shaft (47) is driven via the synchronized rotation driving shaft (45) of the synchronized rotational speed to drive the cutting pretreatment device (49) and the feed chain (7) in synchronization, while the barrel driving shaft (40 ) And the selection drive shaft (41) to drive the handling cylinder (3a), the processing cylinder (29), the blower fan (20), the Kara fan (19), the swing selection mechanism, and the like.

  Further, when the combine (1) is stopped or retracted when the combine is changed during the cutting and threshing operation in the field, the driving of the pre-cutting device (4) and the feed chain (7) is stopped. When this is done, the tuning clutch (46) and the flow-in clutch (48) are turned off. To drive only the feed chain (7), the cutting clutch (49) is turned off. In this case, there is no power transmission to the cutting pretreatment device (4), and power is transmitted only from the power branching mission (39) to the feed chain (7) via the cutting shaft (47).

  The ultrasonic sensor (20) as a non-contact type cutting height sensor for detecting the cutting height by detecting the ground contact height between the cutting pretreatment device (4) and the field scene, 6) is disposed on a bracket (not shown) provided on the back surface side, and as shown in FIG. 6, the transmitter (horn unit) and the receiver (20b) of the transmitter (20a) in the ultrasonic sensor (20) The receiver is placed so as to face the farm scene. When the installation height of the ultrasonic sensor (20) is different from the installation height of the cutting blade (5), the cutting height detection value is obtained by predetermined conversion from the detection value of the ultrasonic sensor (20). Yes.

  Next, the configuration of the grounding type cutting height sensor (90) will be described with reference to FIG. In this embodiment, among the plurality of weed bodies (10) arranged to protrude from the lower front end of the cutting pre-treatment device (4), the rotary weed body (10a) arranged at the rightmost end in the forward direction. ) (See FIG. 2), the ground type cutting height sensor (90) is installed, and the other weeding bodies (10) are fixed to the lower frame (4a) or the like.

  A hitch spring holder (92) is fixed to a mounting plate (91) erected on a longitudinal lower frame (4a) at the rear of the rotating herbaceous body (10a) by a bolt, and the hitch spring holder The sliding rod (94) is supported by passing through the front plate (93) of (92) and a midway plate (not shown) at the rear side thereof, and the front locking rod (95a) is moved forward of the sliding rod (94). A biasing spring (96), which is pin-fixed to the part and supported by the front locking rod (95a), is fitted on the sliding rod (94), and the rear end of the biasing spring (96) The sliding rod (94) is projected and biased forward by being loosely fitted to the moving rod (94) and supported by the locking rod (95b) after coming into non-retractable contact with the intermediate plate. . The sensor body (98) is mounted on the rear plate of the hitch spring holder (92) so that the front / rear position can be adjusted with an adjusting screw.

  The sensor rod (98a) projecting from the front end of the sensor body (98) is brought into contact with the rear end surface of the sliding rod (94) by the front / rear position adjustment operation by the adjustment screw or appropriately. Are set to face each other with a gap therebetween. The outer periphery of the sensor rod (98a) is covered with bellows type rubber boots and protected from mud. The sensor body (98) is configured as a switch in this embodiment, and is configured to be turned on when the sensor rod (98a) that is OFF when the protrusion is biased is retracted by a predetermined amount. Alternatively, an optical sensor such as a photo interrupter or a capacitive sensor may be used.

  On the pivot shaft (101) rotatably supported by the left and right side plates (not shown) of the holder (100) bolted to the front end of the lower frame (4a), the rotating weed body (10a) is provided. ) And a fitting cylinder (not shown) at the base of the interlocking arm (103) for supporting the substantially triangular weed body (102) in a front view so as to be vertically rotatable is integrally rotated via a key. The vertical rotating arm (105) fixed to the pivot shaft (101) outside the one side plate (not shown) is opposed to the front end of the sliding rod (94). A contact plate (105a) is provided so as to achieve this.

  On the other hand, the lift position sensor (22) as a cutting position sensor detects the height of the combined body between the combine (1) and the pre-cutting processing device (4). In this embodiment, FIG. 3 and FIG. As shown, a sensing pivot arm (23) of a pivot potentiometer type lift position sensor (22) fixed to the bearing bracket (16) is attached to a sensor shaft (24) secured to the outer surface of a horizontal cylinder (15). By contacting and detecting the rotation angle θ of the horizontal cylinder (15), the rotation angle of the elevating cylinder frame (14), and thus the elevating apparatus of the pre-cutting device (4) for the combine (1) Position) can be detected. A setting value by a cutting height setting device (73) described later corresponds to a predetermined value in the detection value of the elevation position sensor (22).

  FIG. 6 shows a functional block diagram of a control device (70) for executing cutting height control and auto clutch control. The control device (70) is an electronic control device such as a microcomputer and is not shown. A central processing unit (CPU) for executing various arithmetic processes and controls, a read-only memory (ROM) that stores a control program, and a readable / writable memory that temporarily stores various detection values, data, etc. RAM), a non-volatile memory for holding stored data even when the control device is turned off, a clock as a timer function, an interface, a bus, and the like.

  An ultrasonic wave is transmitted to the transmitter (20a) in the ultrasonic sensor (20) at an appropriate time interval T1 via a transmission drive circuit (71) in response to a command from the control device (70), and is detected by an object to be detected. The reflected wave reflected is received by the receiver (20b), and the detection signal is input to the control device (70) via the reception amplifier circuit (72). A detection signal of the elevation position sensor (22) is also input to the control device (70) at each time interval T1 via an A / D converter.

  Also, the sensor body (98) in the grounding type sensor (90), the variable resistance type cutting height setting device (73), the three-position detection type manual switch (76) when performing the cutting and threshing operation in the manual mode, the same An automatic switch (75) when the work is set to the automatic control mode, and further, when it is executed manually, the operator steps on the foot to change the lifting amount and / or the lifting speed of the pre-cutting processing device (4) to a smaller side. Each signal of the foot switch (74) for ON / OFF operation is also input to the control device (70).

  Further, the control device (70) outputs a predetermined raising / lowering command signal to the first drive circuit (77) and the second drive circuit (78) according to a predetermined calculation result, and the first drive circuit (77). The electromagnetic solenoids (80a) and (80b) of the hydraulic pressure switching valve (80) in the hydraulic circuit (79) are actuated in response to the output from the hydraulic circuit (79), while the high-speed response electromagnetic valve in accordance with the output from the second drive circuit (78) The electromagnetic solenoid (50a) of the electromagnetic proportional pressure reducing valve (50) which is an example is operated, and the single action hydraulic cylinder (9) for raising and lowering the cutting pretreatment device (4) is operated.

  The operation control of the lifting hydraulic cylinder (9) of the pre-cutting processing device (4) is executed as follows. That is, when the hydraulic hydraulic switching valve (80) is switched to extend the hydraulic cylinder (9) (when the cutting pretreatment device (4) is driven up), the electromagnetic solenoid (80a) is subjected to pulse width modulation control. When operated at (PWM), the pilot pressure adjusted to an appropriate hydraulic pressure by the electromagnetic proportional pressure reducing valve (50) acts on the variable throttle valve (58), and the throttle degree of the variable throttle valve (58) changes arbitrarily. Then, the oil is drained from the return oil pipe (57) to the oil tank (60). In that case, the operating speed of the hydraulic cylinder (9) is adjusted according to the throttle degree of the variable throttle valve (58).

  When the hydraulic cylinder (9) is reduced (when the cutting pretreatment device (4) is driven downward), the hydraulic pressure switching valve (80) is neutralized and the electromagnetic proportional pressure reducing valve (50) is the same as described above. It is operated by a pulse width modulation control (PWM) system, and the throttle opening of the variable throttle valve (58) is adjusted by adjusting the pilot pressure, thereby adjusting the operating speed of the hydraulic cylinder (9).

  Next, cutting height control will be described. When the automatic switch (75) for setting the automatic mode is ON, the detection value of the ultrasonic sensor (20) as a non-contact sensor is input to the control device (70), and the cutting height is set. When the value of the ultrasonic sensor (20) is higher than the preset cutting height setting value, the hydraulic switching valve (80) and the electromagnetic proportional pressure reducing valve ( 50), the cutting pretreatment device (4) is moved downward, and when the detection value of the ultrasonic sensor (20) is lower, the cutting pretreatment device (4) is driven up, It is automatically adjusted to be. In these cases, when the deviation between the cutting height setting value and the detection value of the ultrasonic sensor (20) is large, the hydraulic cylinder (9) is driven quickly by the continuous drive signal, and the lifting / lowering speed of the cutting pre-processing device (4) is increased. When the deviation is reduced, the drive of the hydraulic cylinder (9) is reduced by the pulse width modulation control (PWM) method, and the lifting / lowering speed of the pre-cutting processing device (4) is reduced to reduce the cutting height. Fine adjustment is possible.

  By the way, the scraping of the field scene is insufficient, or the field scene can be uneven by spraying fertilizer or chemicals, grooving work, or the like. Moreover, since the ultrasonic sensor (20) as a non-contact type cutting height sensor is arranged behind the weed body (10) and the detection result is likely to vary, a cutting height control delay occurs, Since the ultrasonic sensor (20) cannot detect the partially uneven portion, if the lower end of the weed body (10) is brought very close to the field scene, the tip of the weed body (10) protrudes into the convex part of the field scene. There was a fear. Therefore, when the cutting height control is performed by the ultrasonic sensor (20), the lifting and lowering of the rotary weeding body (10a) with the casing (107) as the grounding cutting height sensor (90) is moved up and down. 98) When detecting the ON / OFF signal of 98) and detecting the ground contact with the field scene based on the detection signal, this sensing is prioritized and the cutting pre-processing device (4) is controlled to be driven up. .

  That is, by pressing the contact plate (105a) of the rotating arm (105) through the constantly biasing spring (96) and the sliding rod (94), the distal end side of the interlocking arm (103) is pressed downward. The rod body (107) at the lower end of the rotating weed body (10a) attached to the front end side is held in a state approaching the farm scene (106). And when the said housing (107) is pushed up by the convex part in a farm scene (106), the front end side of the interlocking | linkage arm (103) will rotate upwards centering on the pivot (101), and it will be integrated. The sliding rod (94) is retracted against the force of the urging spring (96) by the contact plate (105a) of the rotating arm (105) that rotates, and the sensor body (98) is retreated at its rear end. Turn on the switch. As a result, the hydraulic cylinder (9) is extended so that the lower end of the weed body (10) in the pre-harvest processing device (4) is pushed into the convex portion of the farm scene (106) and the soil is brought into the threshing device (3). It can be completely prevented.

  Moreover, when performing the operation of cutting the fallen grain culm, it is necessary to keep the lower end of the weeding body (10) in a state of being very close to the farm scene (106). When the control for raising the pre-cutting device (4) is executed, the uncut rice cake is left uncut, so as shown in FIG. 8, the operation lever (110) provided in the cab (11) is moved forward. By pulling and locking to a locking portion (not shown) on the rear side of the guide groove (111), the interlocking arm (103) and the rotating type part are connected via the operation wire (109) and the auxiliary arm (108). The chassis (107) with the grass body (10a) is held at a raised position far away from the farm scene (106). When the operating lever (110) is locked to the locking portion on the rear side, the upward rotation position of the interlocking arm (103) becomes higher. In these cases, a signal from the sensor body (98) is sent to the control device (70) by a switch (not shown) provided in the operation part (may be a switch interlocking with the backward rotation of the operation lever (110)). Since the sensor body (98) is not turned on, the cutting operation of the fallen cedar brought close to the field scene (106) of the weed body (10) can be performed reliably. It is.

  Next, Embodiment 1 of the cutting height control device for the combine according to the present invention will be described. In the harvesting operation, when the automatic cutting height switch (75) for setting the combine control device to the automatic mode is ON, the cutting height is high in a field where the field scene is flat and free from puddles. In a state where the ultrasonic sensor (20), which is a vertical sensor, is normally detecting, the elevation drive of the pre-cutting processing device (4) is controlled based on the sensor data of the cutting height sensor (20). In this control, a value detected by the cutting height sensor (20) is input to the control device (70), and is compared with a cutting height setting value set in advance by a cutting height setting unit (73). When the detected value of the sensor (20) is high, the cutting pre-treatment device (4) is driven down through the hydraulic pressure switching valve (80) and the electromagnetic proportional pressure reducing valve (50), and the cutting height sensor (20) When the detected value is low, the pre-cutting processing device (4) is driven up and automatically adjusted so that both are set to the set height.

  However, the field scene is not sufficiently scratched, the field scene is uneven by spreading fertilizer, grooving work, etc., or the cutting height sensor (20) is arranged behind the weed body (10). Therefore, the detection results are likely to vary, and there may be a delay in cutting height control, or ultrasonic waves may not be detected at the partially uneven portions. In such a case, the cutting height sensor (20) is not effective. The operation is discriminated and the automatic cutting height switch (75) is turned off. Next, instead of the cutting height sensor (20), rotation as a cutting position sensor for detecting the relative height between the combine (1) and the cutting pretreatment device (4) provided on the lifting cylinder frame (14). The turning angle of the horizontal cylinder (15) can be detected by the potentiometer type lift position sensor (22), and the drive control of the cutting pretreatment device (4) can be performed.

  The first embodiment will be described based on the flowchart shown in FIG. Following the start, it is determined whether the cutting height automatic switch (75) is ON or OFF (S1). When the cutting height automatic switch (75) is ON (S1: ON), the raising / lowering drive control of the cutting pretreatment device (4) is executed based on the sensor data of the cutting height sensor (20) (S2). . When the cutting height automatic switch (75) is OFF (S1: ON), the elevation drive control by the cutting position sensor (22) is executed (S3). As described above, conventionally, the driving device of the pre-cutting processing device (4) is controlled based only on the detection data of the cutting height sensor (20), but there is an inconvenience in the detection of the cutting height sensor (20). If it occurs, the inoperative is discriminated, and the lifting / lowering drive control of the cutting pretreatment device (4) can be performed based on the detection signal of the cutting position sensor (22). The set function can be used stably.

  Furthermore, Embodiment 2 of the cutting height control apparatus for the combine according to the present invention will be described. In the first embodiment, a grounding-type cutting height sensor (90) is further added to the cutting height sensor (20) and the cutting position sensor (22) used as cutting height control sensors, and the main transmission lever (85 This embodiment is a cutting height control associated with various switch operation units provided on the knob. That is, the grounding-type cutting height sensor (90) is a sensor for measuring the lifting and lowering of the rotating weed body (10a) with the housing (107) in order to eliminate the disadvantages of the contact-type cutting height sensor (20). Detecting by the ON / OFF signal of the body (98), and when detecting the ground contact with the field scene by the detection signal, this sensing is prioritized to control the cutting pretreatment device (4) to be driven up It is.

  When the operator moves the lifting / lowering drive control of the pre-cutting device (4), when the operator presses the auto set button (85d) provided on the knob of the main transmission lever (85) when the work clutch is “cutting / engaging”, the control is performed. When the device (70) determines that the auto set button (85d) has been pressed and then determines that the cutting height automatic switch (75) on the operation panel has been pressed, the grounding type cutting Based on the detection output of the height sensor (90), the drive control of the pre-cutting processing device (4) is executed with the highest priority. In addition, when the cutting height automatic switch (75) is not pressed, the cutting pre-processing device (4) is driven up by pressing the auto set button (85d).

  The second embodiment will be described based on the flowchart shown in FIG. Following the start, it is determined whether the auto set (85d) provided on the main transmission lever (85) is ON or OFF (S1), and if auto set is in progress (S1: YES), or enters the auto set However, if the automatic cutting height switch (75) is ON (S2), the cutting pretreatment device (4) is activated based on the detection output of the grounding type cutting height sensor (90). The drive drive ascending drive control (grounding type autolift) is preferentially executed (S3). If the cutting height automatic switch (75) is OFF, the process returns to switch to the auto set.

  In addition, although the said Example 1 and 2 are cutting height control by the detection signal of a cutting height sensor (20), it replaces with this cutting height sensor (20), and uses the detection signal of a cutting position sensor (22). Accordingly, the driving device of the pre-cutting processing device (4) can be controlled to move up and down. That is, when the selection switch (75a) is provided on the operation panel and the operator operates the selection switch (75a), the control device (70) switches the detection signal of the cutting position sensor (22) to the priority circuit, The ascending drive control of the pre-cutting processing device can be performed according to the same flowchart as in the first embodiment.

Combine side view Top view of the combine Side view showing position sensor mounting position Plan view showing the position sensor mounting position Skeleton diagram of power transmission system Functional block diagram of hydraulic circuit and control means (B) Perspective view of the driver's cab (b) Perspective view of the main transmission lever Top view of the cab Side view of contact-type cutting height sensor device Control flow chart of pre-cutting device by cutting height automatic switch Control flow chart of cutting pre-treatment device by grounding type cutting height sensor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combine 4 Cutting pretreatment apparatus 10 Weeding body 10a Rotating type weeding body 20 Cutting height sensor 22 Cutting position sensor 70 Control device 75 Automatic switch 75a Selection switch 85 Main transmission lever 85a Main transmission lever knob 85b Cutting lifting switch 85c Auto lift switch 85d Auto set switch 90 Grounding type cutting height sensor 107

Claims (1)

The cutting pretreatment device is configured to be movable up and down by a lifting drive means with respect to the front part of the combine, and the cutting height sensor for detecting the ground height between the cutting pretreatment device and the field scene, the combine and the cutting pretreatment In a combine configured to drive the lifting drive means up and down by a detection signal of a cutting position sensor that detects a relative height with the device,
An auto lift switch that automatically disengages the cutting clutch when the cutting pre-treatment device is raised to a certain height;
An auto set switch that automatically engages the cutting clutch when the cutting pre-treatment device is lowered to a certain height;
When the automatic cutting height switch is OFF, the combine driving control is performed on the cutting pre-processing device to the cutting unit setting position based on the cutting position sensor data.

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