JP2855680B2 - Combine cutting height control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a combine cutting height control device.

2. Description of the Related Art A position sensor for detecting a height position of a reaper with respect to a vehicle body is provided, the height of the reaper detected by the position sensor is set in several stages, and a cutting height setting dial is set to a target cutting height. When the reaper is lowered at the set position, the reaper is set at the height set by the setting dial. When the cutting height control is started, the ultrasonic sensor detects the ground height of the reaper during a certain distance, stores the average value of the ground height as a control target height, and thereafter detects the ground height by the ultrasonic sensor. The cutting height is controlled by raising and lowering the reaping device so that the ground height of the ground approaches the control target height.

As described above, in the mode in which the control target height of the mowing device is set by the mowing height setting dial, the mowing device is set to a desired mowing height position by manual operation during the mowing operation. When the cutting height control is started, if the cutting height setting dial is at an arbitrary position and deviates from the desired cutting height position,
Since the mowing device is suddenly moved up and down to the setting position of the cutting height setting dial and the cutting height is different, it has been necessary to reset the cutting height position of the cutting device with the cutting height setting dial again.

Therefore, the present invention is intended to prevent a malfunction at the start of the cutting height control and to facilitate the setting of the control target value.

Means for Solving the Problems According to the present invention, an ultrasonic sensor (2) for transmitting ultrasonic waves to a mowed soil surface to detect the height of the mowing device (1) with respect to the ground is used to mount the mowing device (1) on a vehicle body ( A harvesting control device (4) that raises and lowers the ground height with respect to 3) and controls the ground height to be constant, detects the ground height by an ultrasonic sensor (2) when the working conditions at the start of the harvesting work are aligned, The detected value is used as the control target value to provide a combine configuration.

When the harvesting operation is started by moving the combine into the field, the cutting height automatic switch is turned on, the grain culm sensor is turned on to detect that there is a grain culm in the mowing device (1), and the threshing device is turned on. When the transmission clutch is engaged and the working conditions at the start of the mowing work are aligned, the ground height is detected by the ultrasonic sensor (2).

The data of the ground height detected by the ultrasonic sensor (2) is stored as a control target value, and thereafter, the ground height detected by the ultrasonic sensor (2) is compared with the control target value, The mowing device (1) is moved up and down with respect to the vehicle body (3) so as to maintain the height at the control target value, and the mowing height is controlled by the mowing height control device (4).

As described above, when the working conditions at the start of the mowing work are prepared, the control target value is directly determined by the ultrasonic sensor (2). Therefore, it is necessary to operate the cutting height setting dial as in the prior art. And the control target value of the ground height can be easily set, so that the cutting height control can be started smoothly.

Embodiment In the example shown in the drawings, the combine has a threshing device (6) mounted on a vehicle body (3) having a left-right traveling device (5), and a mowing device (1) is provided at a front portion of the vehicle body (3). ing.

A transmission case (7) in which a transmission mechanism for transmitting the left and right traveling device (5) and the reaper (1) is installed at the front of the vehicle body (3).
And on the transmission case (7), the upper part of the rear end of the reaper frame (8) forming the main body of the reaper (1) is mounted so as to be rotatable around a horizontal axis (9). (8) is configured to be supported by an elevating cylinder (10) between itself and the vehicle body (3) and to be able to ascend and descend around the horizontal axis (9) by expansion and contraction of the elevating cylinder (10) by hydraulic pressure.

The harvesting device (1) includes a weeding body (11), a grain stalk raising device (12), a grain stalk raking device (13), a cutting blade device (14), and a harvester from the front side to the rear portion of the reaper frame (8). A collecting device (15) for collecting and transporting cereals, a cereal culm transfer device (16) for transferring the collected culms to a threshing device (6) at the rear, and the like are provided.

A grain stalk sensor (17) for detecting the presence or absence of a grain stalk is provided behind the grain stalk raising device (12). The transmission case (7) includes a traveling distance sensor (18) for detecting a rotation speed from a part of a transmission mechanism for transmitting the left and right traveling device (5) and detecting a traveling distance of the left and right traveling device (5). Provided.

An operation lever (19) is provided on the control stand of the vehicle body (3) so as to be tiltable in the front-rear direction. When the operating lever (19) is tilted forward and backward, the mowing device (1) is moved up and down the cylinder (1).
This is an interlocking structure that can be lowered or raised by expansion and contraction of 0). Lift cylinder by this hydraulic pressure (10)
The hydraulic circuit is moved up and down by a lifting solenoid valve (20) or a descending solenoid valve (21) that is opened and closed by pulse oscillation in this hydraulic circuit.
Is switched between the ascending side and the descending side.
(22) is an unload valve, and (23) is a hydraulic pump.

The ultrasonic sensor (2) is provided on the reaper frame (8),
Transmits ultrasonic waves toward the soil surface, receives the reflected waves reflected from the soil surface, detects the time from transmission to reception, and determines the height of the cutting blade device (14) with respect to the soil surface. Is measured.

FIG. 2 is a block circuit diagram showing, with respect to a cutting height control device (4) including a CPU, a memory, and an input / output circuit, operation information of the operation lever (19), cutting height automatic switch (24), The detection information of the threshing clutch switch (25) for detecting the on / off of the transmission threshing clutch is input to the sound wave sensor (2), the grain culm sensor (17), the mileage sensor (18), and the threshing device (6). Then, according to the information, the cutting height control device (4) sends an ascending solenoid valve (20), a descending solenoid valve (21), and an unloading valve (22).
Is configured to output a control signal to each of the solenoids.

The ultrasonic sensor (2) emits an ultrasonic wave in synchronization with an oscillation pulse from a pulse oscillator, integrates the received data for a certain distance detected by the traveling distance sensor (18), calculates an average, and calculates an average value. Ask.

The mowing device (1) is set to a desired mowing height position by operating the operating lever (19). When the threshing clutch is engaged and transmitted to the threshing device (6), the threshing clutch switch (2
5) is turned ON, and when the harvesting operation starts, the stalk sensor (1
7) Detects culm. When the cutting height automatic switch (24) is turned ON, the cutting device (1) using these operating levers (19)
Set the desired cutting height position, threshing clutch switch (2
The measurement of the ground height by the ultrasonic sensor (2) is started from the point where 5) is turned on and the operating conditions for the detection of the grain stalk of the grain stalk sensor (17) are complete.

The ground height over a certain distance is measured by the ultrasonic sensor (2), and when this measured data is input to the cutting height control device (4), an average operation is performed, and the average value is used as the control target of the ground height. The cutting height is higher and the detected value is determined as the control target value while comparing the average value of the ground height for each fixed distance newly detected by the ultrasonic sensor (2) with the control target value. If it is higher than this, a lowering signal is output from the cutting height control device (4) to reduce the lifting cylinder (10) and lower the cutting device (1) into the range of the control target value. Conversely, when the cutting height is low and equal to or lower than the control target value, an ascending signal is output to extend the lifting cylinder (10), and the cutting height device (1) is raised so as to rise into the control target value region. High control is performed.

In the combine operation, the cutting height control is started by turning on the cutting height automatic switch (24), turning on the grain culm sensor (17), and turning on the threshing clutch switch (25). The ground height is measured by the ultrasonic sensor (2), averaged and stored as a control target value of the ground height, and the cutting height device (1) is maintained at the ground height of the control target value. The cutting height control is performed by the cutting height control device (4).

[Brief description of the drawings]

1 is a block circuit diagram, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is a side view of a front portion of a combine. In the figure, reference numeral (1) denotes a reaper, (2) denotes an ultrasonic sensor,
(3) shows a vehicle body, and (4) shows an automatic cutting height control device.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 1987-36622 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01D 34/02-34/40

Claims (1)

(57) [Claims] 1. An ultrasonic sensor (2) for transmitting ultrasonic waves to a cutting soil surface to detect a height of the cutting device (1) above the ground, and moves the cutting device (1) up and down with respect to a vehicle body (3). In the harvesting control device (4) for maintaining and controlling the ground height to be constant, the ultrasonic sensor (2) detects the ground height when the working conditions at the start of the mowing work are prepared, and this detected value is used as the control target. A combine characterized by a value.