JPH0224415Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a cutting height control device for a combine harvester that uses a non-contact type sensor such as an ultrasonic wave, and specifically relates to the installation position of the sensor.

(B) Prior art Generally, the cutting height control device of a combine harvester has a sensor arm hanging down from the lower surface of the cutting, and the height of the cutting part is detected by bringing the arm into contact with the field surface. Recently, instead of a contact type sensor arm, a non-contact type sensor that uses waves such as ultrasonic waves is used, and by emitting waves from the sensor and measuring the delay time of the reflected wave, it is possible to detect the reaping part. Devices have been devised to detect height above ground.

Then, the non-contact type sensor controls the cutting height of the cutting section based on the detection of the height above the ground, and the direction sensor installed in the cutting section controls the direction of the machine by detecting contact with the grain culm, Reaping work is carried out.

(c) Problems to be solved by the invention Therefore, since the mowing height sensor, which is a non-contact type sensor, detects the mowing height by measuring the delay time of reflected waves, it must be placed at a position somewhat higher than the field surface. In addition, since the direction sensor detects contact with the base of the plant and detects the horizontal deviation of the machine body, it needs to be installed at a low position relative to the field. Furthermore, when the direction of the machine is controlled based on the detection of the direction sensor, the cutting height sensor is installed near the direction sensor in order to prevent the wave motion for detecting the cutting height from being reflected on the adjacent grain culm. It is necessary to set it up.

However, if the mowing height sensor is placed near the direction sensor and above the direction sensor, when the arm of the direction sensor is in contact with the grain culm and rotating, the waves emitted from the mowing height sensor will be , the mowing height was often incorrectly detected due to reflection on the arm of the direction sensor located below the mowing height sensor.

(d) Means for solving the problem The purpose of this invention is to solve the above-mentioned problems, and a cutting height sensor consisting of a non-contact type sensor is arranged on one side of the cutting part. The guide tube of the cutting height sensor is arranged in a space formed by the reaping section side cover and the direction sensor, which is behind the grain culm lifting device and is connected to the device, and the guide cylinder of the cutting height sensor is connected to the direction sensor. This is characterized in that the sensor is arranged at approximately the same height position as the direction sensor on the outside of the fuselage.

(E) Effect Based on the above configuration, waves such as ultrasonic waves emitted from the cutting height sensor, which is a non-contact type sensor, are directly reflected onto the field surface without being interfered with by a direction sensor, etc. The waves are directly received by the cutting height sensor without being interfered with by a direction sensor or the like.
In addition, even if the machine corrects direction based on detection by the direction sensor, the waves emitted from the cutting height sensor will not be interfered with by adjacent grain culms, and will be reflected directly onto the field between the reaped grain culm and the adjacent grain culm. , the reflected wave is directly received by the mowing height sensor.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

On the uncut side of the reaping section 1 of the combine, as shown in Figs. 1 and 2, an uncut side branch 2 is fixed and supported at its tip 2' by a linear support rod 3. , furthermore, the support rod 3 is fixed to the reaping frame 5.
Supported. In addition, a bracket 6 is connected and fixed to the rear side of the weeding body 2 between it and the reaping frame 5, and further behind the weeding body 2, a grain culm lifting device 7 has one end fixed to the reaping frame 5.・Supported and installed. Further, a direction sensor 9 is fixed and supported by the reaping frame 5 at a predetermined height behind the grain culm pulling device 7 at the rear position of the sowing body 2.
The direction sensor 9 has a sensor arm 9a installed toward the inside of the aircraft body. Further, a reaping section side cover 10 is attached to the outer side of the machine body of the lifting device 7, and the side cover 1
0 extends rearward so as to cover the side surface of the cutting section.
A cutting height sensor 11 consisting of a non-contact type sensor is arranged behind the grain culm lifting device 7 and in a space formed by the cutting section side cover 10 and the direction sensor 9. The sensor 11 is installed on the side cover 1 of the reaping section at a position above the outside of the machine from the direction sensor 9.
0, and guide tubes 16a and 16b of a cutting height sensor 11, which will be described later, extend to the lower end of the side surface of the direction sensor 9. In addition, the cutting height sensor 11 and the direction sensor 9 are connected to the second
As shown in the figure, the mowing height sensor 11 is disposed on the back side of the weeding body 2, and the mowing height sensor 11 is located above the direction sensor 9 on the outside of the body, so that the emitted ultrasonic waves are transmitted to the direction sensor 9. There is no interference from arm 9a. Further, the cutting height sensor 11 and the direction sensor 9 are arranged at overlapping positions as shown in FIG. 1 when viewed from the side.

In addition, in FIG. 1 and FIG. 2, the code|symbol 12 is a narrow guide.

The cutting height sensor 11 also includes an ultrasonic transmitter 11a and an ultrasonic receiver 11b, as shown in FIG.
is attached to a case 16 having a transmission guide tube 16a and a reception guide tube 16b via a vibration-proof rubber 15, and these guide tubes 16a, 16
b is open toward the lower position, that is, towards the field scene.

Further, as shown in FIG. 4, an ultrasonic transmitter 11
a and the receiver 11b are connected to a time measuring circuit 20 via a transmitting circuit 17 and a receiving circuit 19, respectively,
Furthermore, a solenoid valve 25 is connected to the distance measuring circuit 21 and, via a comparison circuit 23 that compares the signal from the circuit 21 and the signal from the cutting height setting device 22, controls the hydraulic cylinder for raising and lowering the reaping section.
is connected to.

Since the present embodiment has the above-described configuration, during the harvesting operation of the combine, the direction sensor 9 detects contact with the grain culms, and based on the detection, the direction of the machine is corrected so that it follows the rows of the grain culms. At the same time, ultrasonic waves are transmitted from the ultrasonic wave transmitter 11a of the cutting height sensor 11 at predetermined intervals. Then, the ultrasonic waves are reflected on the field and are received by the receiver 11b after t seconds, but at this time, the cutting height sensor 11 is
Since the sensor arm 9a of the direction sensor 9 is disposed higher outside the fuselage, no matter what rotational position the sensor arm 9a of the direction sensor 9 is in, the ultrasonic waves will not be interfered with by the arm 9a and will be transmitted directly from the transmission guide tube 16a. Pronounced towards the field scene. Further, the direction of the machine is controlled based on the detection of contact with the grain culm by the direction sensor 9, but since the automatic direction control is controlled based on the uncut side row, the direction sensor 9 is arranged near the direction sensor 9. The cutting height sensor 11 is always located between the rows, and its ultrasonic waves are directly launched from the transmitting guide cylinder 16a toward the field scene of the reaped grain culm and the adjacent grain culm, and the reflected waves from the field scene are received. It is guided by the guide tube 16b and directly received by the wave receiver 11b.

Then, based on the time delay of the ultrasonic waves received by the receiver 11b, the time measuring circuit 20 and the distance measuring circuit 21 determine the height distance above the ground, and furthermore, the measured distance and the height set in advance by the setting device 22 are determined. The mowing height distance is compared by a comparator 23. and,
If the measured distance is greater than the set cutting height, the solenoid valve 25 is switched downward to lower the reaping section 1, and if the measured distance is smaller than the set cutting height, the valve 25 is switched upward to set the measured distance. Controlled to match cutting height.

(g) Effect of the invention As explained above, according to the invention, the cutting height sensor 1 consisting of non-contact type sensors 11a and 11b
1 is a space behind the grain culm lifting device 7 disposed on one side of the reaping section 1 and constituted by a reaping section side cover 10 and a direction sensor 9 connected to the lifting device 7; The cutting height sensor 11
The field scene can be detected without the waves transmitted from the direction sensor 9 being interfered with, the field scene can be detected accurately and reliably, and highly accurate cutting height control can be performed. Further, the direction of the machine body is controlled by the direction sensor 9, and the guide cylinder 16a of the cutting height sensor 11,
Since the cutting height sensor 16b is arranged at approximately the same height as the direction sensor 9 on the outside of the machine body, the cutting height sensor 11 is always located between the rows and is not interfered with by the grain culm. The field scene between the harvested grain culm and the adjacent grain culm can be reliably detected without any trouble. Furthermore, since the cutting height sensor 11 is disposed in a space surrounded by the grain culm lifting device 7, the reaping section side cover 10, and the direction sensor 9, even if the reaped grain culm and the adjacent grain culm are lying down, The waves transmitted from the cutting height sensor are not interfered with by the lodging grain culm, and furthermore, the guide tubes 16a and 16b of the cutting height sensor are not damaged by catching the grain culm. In addition, when horizontally mowing, the uncut side grass division 2
The wave motion transmitted from the cutting height sensor 11 may detect the split stumps divided by the cutting height sensor 11, but in this case, since the direction sensor 9 is detecting the grain culm, the direction sensor 9 detects the grain culm during horizontal cutting. Mowing height sensor 1 at the same time as detection
If the configuration is such that the detection signal No. 1 is ignored, malfunction of the cutting height sensor 11 during horizontal mowing can be easily prevented.

[Brief explanation of the drawing]

Fig. 1 is a side view of the weeding section showing the installation of the cutting height sensor consisting of a non-contact type sensor according to the present invention, Fig. 2 is a partially cutaway front view thereof, and Fig. 3 is the part used in the present invention. FIG. 4 is a sectional view showing a cutting height sensor made of a non-contact type sensor, and FIG. 4 is a control block diagram showing a cutting height control system. DESCRIPTION OF SYMBOLS 1...Reaping part, 2...Uncut side grass cutting body, 7...Grain culm lifting device, 9...Direction sensor, 10...Reaping part side cover, 11...Mowing height sensor, 11a,
11b... Non-contact sensor (11a... Ultrasonic wave transmitter, 11b... Ultrasonic wave receiver).

Claims (1)

[Scope of Claim for Utility Model Registration] A direction sensor 9 is disposed in the reaping unit 1, and has a sensor arm 9a that protrudes inward from the body and comes into contact with the grain culm to detect the horizontal deviation of the body.
Non-contact sensors 11a and 11b that emit ultrasonic waves or the like toward the field and receive the reflected waves to detect the height of the cutting section above the ground; and a guide that guides the ultrasonic waves or the like and the reflected waves. In a combine harvester equipped with a cutting height sensor 11 consisting of cylinders 16a and 16b, the cutting height sensor is located behind the grain culm lifting device 7 arranged on one side of the reaping part, and It is arranged in a space formed by the reaping section side cover 10 and the direction sensor connected to the device, and the guide tube of the cutting height sensor is connected to the direction sensor on the outside of the machine body. A mowing height control device for a combine harvester using non-contact sensors, characterized in that they are arranged at approximately the same height position.