JPH0226262Y2 - - 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 utilizes a non-contact type sensor such as an ultrasonic wave, and specifically relates to a sensor installation structure.

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

In addition, the grain culm raising device 7' on one side of the reaping section is
As shown in FIG. 4, the non-contact type sensor 12' is generally supported by a linear cutting frame 5' via a support member 9' on the back side of the grass divider 2'. A rod-shaped attachment member 13' is formed to protrude from the support member 9' of the grain culm raising device 7' so as to be located behind the grain culm raising device 7' and above the reaping frame 5'. It was beginning to be installed in

(c) Problems to be solved by the invention By the way, in the device shown in FIG. Even in normal situations, the field scene G cannot be accurately detected due to interference from the reflected waves from the cutting frame 5', and in particular, when the grass cutting body 2' is brought into contact with the field scene G in order to cut down fallen timber, etc. If the two vehicles were to travel very close to each other, it would be impossible to distinguish between the two reflected waves, and there was a risk that the cutting height could not be controlled. Furthermore, since a gap is formed between the support member 9' of the grain culm raising device 7' and the sensor 12' attached to the mounting member 13', weeds, mud, grain culms, etc. There has been a drawback that the particles get into the detection area of the sensor 12' by accumulating without falling out, and the normal detection operation is obstructed. Furthermore, since the sensor 12' is attached only by the rod-shaped attachment member 13', deformation of the attachment member 13' may cause distortion in the attachment state of the sensor 12', making it difficult to accurately detect the height above the ground. The drawback was that it was impossible to do so.

(d) Means for solving the problem The present invention aims to solve the above-mentioned problems, and as shown in FIGS. 1 and 2, a non-contact type cutting height sensor 12 is used. at least the sensor whose one side is fixed and supported along the support member 9 of the grain culm raising device 7 and whose lower end is fixed and supported along the outer edge of the reaping frame 5 having a linear shape. The guide plate 13 has a width equal to or larger than the width of the guide plate 13, and is arranged in close contact with the upper part of the guide plate 13 which curves inward from the top to the bottom of the body, and on the back side of the grass dividing body 2. This is characterized in that the guide plate 13 forms an ultrasonic space that is open to the outside of the body.

(e) Effect Based on the above configuration, a non-contact type cutting height sensor 1
The ultrasonic waves emitted from the reaping frame 5 are radiated directly to the field scene G without being interfered with by the reaping frame 5, etc., and the reflected waves from the field are directly transmitted to the sensor without being interfered with by the reaping frame 5 etc. Received on 12th.

(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 grass division 2 is fixed and supported at its tip 2a by a linear support rod 3, Furthermore, the support rod 3 is fixed and supported by the reaping frame 5. 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 furthermore, at the rear of the weeding body 2, a grain culm lifting device 7 connects one end of the weeding body to the reaping frame 5. It is fixed and supported via a support member 9. Further, a direction sensor 10 is fixed and supported by the reaping frame 5 and is disposed at a predetermined height behind the grain culm raising device 7 at the rear position of the weeding body 2, and the direction sensor 10 is directed toward the inside of the machine body. A sensor arm 10a is installed. Furthermore,
A reaping section side cover 11 is attached to the outer side of the grain culm raising device 7.
extends toward the rear of the machine so as to cover the side surface of the reaping section 1 above the opening of the guide tube of the cutting height sensor 12, which will be described later. A guide plate 13 for attaching a non-contact type cutting height sensor 12 is disposed behind the grain culm raising device 7.
As shown in FIG. 1, is a rectangular plate having a width at least equal to or greater than the width of the cutting height sensor 12, and as shown in FIG. It has a shape that curves in both directions, and one side of the front side of the machine body is fixed and supported along the support member 9 of the grain culm raising device 7, and its lower end is the outer end of the machine body of the reaping frame 5. The cutting height sensor 12 is fixed and supported along the edge, and the cutting height sensor 12 is attached and fixed in close contact with a position outside the machine body above the guide plate 13. Therefore, the ultrasonic wave from the cutting height sensor 12 and the reflected wave from the field are guided along the guide plate 13, and the guide plate 13 It constitutes a space for sound waves.

Note that the reference numeral 15 in FIGS. 1 and 2 is a narrow guide. Further, reference numerals 12c and 12d indicate a transmitting guide tube and a receiving guide tube, respectively.

In addition, as shown in FIG.
b are the drive circuit 16 and the oscillation circuit 1, respectively.
7, sampling output circuit 19 and amplifier 2
0, a comparison circuit 25 that is connected to the distance detection circuit 22 via the detection circuit 21 and compares the signal from the circuit 22 with the signal from the cutting height setting device 23;
Through the operating circuit 26, it is connected to a lifting solenoid 27a and a lowering solenoid 27b of a solenoid valve that controls a hydraulic cylinder for lifting and lowering the reaping section.

Since this embodiment has the above-described configuration, ultrasonic waves are transmitted from the ultrasonic wave transmitter 12a of the cutting height sensor 12 at predetermined intervals during the cutting operation of the combine harvester. Then, the ultrasonic waves are reflected on the field and t
Seconds later, it is received by the receiver 12b, but at this time,
Since the guide plate 13 is arranged so as to face downward from the side of the cutting height sensor 12 and cover the lower cutting frame 5, the ultrasonic waves are transmitted from the transmitting guide cylinder 12c without interfering with the cutting frame 5. The waves are emitted directly toward the field, and the reflected waves from the field are guided to the receiving guide tube 12d and directly transmitted to the receiver 12.
Directed to b. Further, the guide plate 13 is extended downward from above to a position close to the field,
In addition, since the transmitter 12a is curved inward, the ultrasonic waves emitted from the transmitter 12a are accurately guided to the field, and the ultrasonic waves are diffused at least to the inside of the machine and are Energy is prevented from decreasing. Then, based on the time delay of the ultrasonic waves received by the receiver 12b, the distance detection circuit 22 determines the height distance above the ground, and further compares the measured distance with the cutting height distance preset in the setting device 23. are compared in the comparison circuit 25. and,
If the measured distance is greater than the set cutting height, the lowering solenoid 27b is energized and the solenoid valve is switched to the lower direction to lower the reaping section 1. If the measured distance is smaller than the set cutting height, the ascending solenoid 27a is energized. Then, the solenoid valve is switched upward, and the measured distance is controlled to match the set cutting height.

(g) Effects of the invention As explained above, according to the invention, the non-contact type cutting height sensor 12 is fixed and supported at one side along the support member 9 of the grain culm raising device 7, and a guide plate 13 whose lower end is fixed and supported along the outer edge of the reaping frame 5 and has a width at least greater than the width of the sensor 12, and is curved inward from the top to the bottom of the machine. Information board 13
Since it is disposed in close contact with the upper part of the outside of the machine body, the wave motion emitted from the cutting height sensor 12 can detect the field scene without being interfered with by the reaping frame 5, and the wave motion can be guided by the guide plate 13. Also, due to the anti-diffusion effect, it is possible to accurately and reliably detect the field scene and perform highly accurate cutting height control. Furthermore, since the flat guide plate 13 exists between the support member 9 of the grain culm raising device 7 and the cutting height sensor 12, it is difficult for weeds, mud, grain culms, etc. to enter, and even if weeds, mud, etc. Even if the particles get in, they are discharged from the rear along the guide plate 13 and the cutting frame 5, and are not deposited in the ultrasonic space.
Furthermore, even if mud adheres to the guide plate 13 or the ultrasonic guide cylinders 12c and 12d become clogged with mud, the outside of the fuselage of these guide plates and guide cylinders remains free.
The adhered mud or clogging can be easily removed. As a result, a stable detection operation is always maintained over a long period of time. Furthermore, since the cutting height sensor 12 is attached to the guide plate 13 that is fixed and supported by both the support member 9 and the linear cutting frame 5,
The guide plate 13 is firmly fixed and does not deform, therefore,
There is no problem in the mounting state of the cutting height sensor 12, and as a result, accurate detection of the cutting height can be maintained over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a side view of the weeding section showing the mounting structure of the non-contact mowing height sensor according to the present invention, Fig. 2 is a partially cutaway front view, and Fig. 3 shows the mowing height control system. FIG. 4 is a schematic front view showing a state in which a conventional non-contact type mowing height sensor is installed. DESCRIPTION OF SYMBOLS 1... Reaping part, 2... Grass splitting body, 5... Reaping frame, 7... Grain culm raising device, 9... Support member, 12... Non-contact type cutting height sensor, 13... Guide plate.

Claims (1)

[Claims for Utility Model Registration] The cutting body 2 is connected to a linear reaping frame 5 extending to one side of the reaping section, and a grain culm lifting device 7 is attached via a support member 9, and the above-mentioned reaping frame is The above-mentioned non-contact mower is equipped with a non-contact mowing height sensor 12 disposed above that emits ultrasonic waves toward the field and receives the reflected waves to detect the height of the cutting section above the ground. The height sensor is fixed and supported at one side along the supporting member of the grain culm raising device, and at least one whose lower end is fixed and supported along the outer edge of the machine body of the linear reaping frame. A guide plate 13 having a width equal to or larger than the width of the sensor, the guide plate 13 curving inward from the top to the bottom of the body, is disposed in close contact with an upper position outside the body of the body,
A mowing height control device for a combine harvester using a non-contact type sensor, characterized in that on the back side of the weed cutting body 2, the ultrasonic space is formed by the guide plate 13 and the outside of the machine body is opened.