JPH0224414Y2 - - Google Patents

Description

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

(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 using waves such as ultrasonic waves is used, and the wave is emitted from the sensor and the delay time of the reflected wave is measured. A device has been devised to detect the height of.

Conventionally, the non-contact type sensor 1 is attached to the back side of a grass divider 3 supported by a linear support rod 2, as shown in FIG. 5, or mounted on a support rod as shown in FIG. 2' is bent to support the rear end portion of the grass divider 3, and is attached to the back surface of the grass divider 3 in front of the support rod 2'.

(c) Problems to be solved by the invention For this reason, in the system shown in Fig. 5, the ultrasonic waves from the sensor 1 are reflected from both the support rod 2 and the field scene G, but the lodging If the grass-cutting body is driven close to the field surface, it will not be possible to distinguish between the two reflected waves, and there is a risk of loss of control.

In addition, in the one shown in FIG. 6, the sensor 1
Although the ultrasonic waves from the weeding body 3 are not reflected back by the support rod 2', the weeding body 3 is supported at its rear end by the bending support rod 2', so the weeding body 3 is protected against force from the front or above. It has an extremely weak structure and is easily deformed, and since there is no support rod on the lower surface of the tip of the weeding body 3, the tip 3' of the weeding body easily penetrates into the field, causing damage to the weeding body 3. Accidents are likely to occur.

(d) Means to solve the problem The purpose of this invention is to solve the above-mentioned problem.
The grass dividing body is installed inclined so that the rear part thereof faces toward the inside of the machine body, and a non-contact type sensor for mowing height detection is arranged on the back side of the rear part of the grass dividing body so as to be biased toward the inside of the machine body. The present invention is characterized in that the sensor is configured to be able to detect the field area within the cutting width without being interfered with by the support rod.

(e) Effect Based on the above configuration, waves such as ultrasonic waves emitted by the non-contact sensor are reflected directly onto the field without being interfered with by the support rods, and furthermore, the reflected waves interfere with the support rods, etc. It is directly received by the sensor without any interference.

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

As shown in FIG. 3, the combine 5 has a reaping section 9 disposed in front of a main machine 7 supported by a crawler 6 so as to be movable up and down. Furthermore, a large number of weeding bodies 3 are installed in the front part of the reaping part 9, and a grain culm lifting device 10 is installed in the rear thereof. In addition, the multi-row cutting combine 5 has different cutting widths, that is, the cut side grass cover 3a and the uncut side grass cover 3b, so that it can be harvested even if the planting size is somewhat wide.
In addition, in order to mow without leaving any uncut material based on the uncut side (left side), the conveyance guide path l on the cut side (right side) is set to the uncut side (left side). (l>l').

And, as detailed in FIGS. 1 and 2,
The mown side grass division 3a is fixed and supported at its tip 3' by a linear support rod 2, and furthermore, the support rod 2
is fixed and supported by the reaping frame 11.
In addition, when viewed from the front, the mown side grass divider 3a is installed with a slight inclination so that the rear part faces toward the inside of the machine body, and the rear side of the grass divider 3a has a space between it and the cutting frame 11. A bracket 12 is connected and fixed. And the bracket 12
The ultrasonic transmitter 1 is attached via the mounting seat 13 to the
An ultrasonic sensor 1 for mowing height detection consisting of a transmitter 1a and an ultrasonic receiver 1b is fixed and arranged, and the transmitter 1a and receiver 1b are provided with anti-vibration rubber in a transmitting guide tube 15a and a receiving guide tube 15b, respectively. 14, and these guide tubes 15a, 15b are not interfered with by the support rod 2 due to the inclined installation of the grass divider 3a.
It opens directly to the field within the cutting width.

Further, as shown in FIG. 4, the ultrasonic transmitter 1a and receiver 1b are each connected to a transmitting circuit 1.
6. A comparison circuit that is connected to the time measurement circuit 18 via the reception circuit 17 and further connected to the distance measurement circuit 19, and that compares the signal from the circuit 19 with the signal from the cutting height setting device 20. 21, it is connected to a solenoid valve 22 that controls a hydraulic cylinder for raising and lowering the reaping section.

In addition, in FIG. 1, the reference numeral 23 is a narrow guide, and the reference numeral 25 is a cover.

Since the present embodiment has the above-described configuration, when the combine harvester 5 is working on reaping, the transmitter 1a of the ultrasonic sensor 1 transmits ultrasonic waves at predetermined intervals. Then, the ultrasonic waves are transmitted to the field and t
It is received by receiver 1b after a second, but at this time,
Since the weed splitting body 3a is installed at an inclination toward the inside of the machine, the ultrasonic waves are emitted directly from the transmitting guide tube 15a toward the field within the cutting width without interfering with the support rod 2. The reflected wave from the receiving guide tube 15b is guided to the receiving guide cylinder 15b and directly received by the receiver 1b. Furthermore, since the mown side conveyance path 1 is configured to be wide, even if the ultrasonic sensor 1 is installed on the inwardly inclined grass culm 3a, the grain culm sensor 1 to be reaped will not sense it. And receiver 1
Based on the time delay of the ultrasonic wave received at b, the time measurement time 18 and the distance measurement circuit 19 determine the height above the ground, and further the measured distance and the setting device 20
The mowing height distance preset by the comparator 21
It is compared in. If the measured distance is greater than the set cutting height, the solenoid valve 22 is switched downward to lower the reaping section 9, and if the measured distance is smaller than the set cutting height, the valve 22 is switched upward to move the measured distance is controlled to match the set cutting height.

In the above-mentioned embodiment, the ultrasonic sensor 1 was disposed on the back side of the mown side grass cover 3a, but the
The sensor 1 may be installed on the back side of the uncut side grass cover 3b by tilting it so that its rear part faces inward. That is, it is preferable to attach the sensor to the tip of the cutting section 9, that is, to the weeding body 3, since the height above the ground can be detected more quickly and it can prevent the sensor from penetrating into the field. When attaching a device called a super divider that forcibly separates and divides grain culms into cut and uncut areas as an attachment, the shape of the dividing body 3b may change, and the ridges may During edge mowing, if the sensor 1 is not installed on the mowed side grass divider 3a, proper cutting height control will not be performed.Furthermore, if the sensor 1 is installed on the uncut side grass divider 3b, the corresponding height will be lowered during horizontal mowing, etc. The sensor 1 detects the cuttings divided by the grass body 3b, but if the sensor 1 were to be configured to ignore the detection signal, the control device would be complicated and expensive. Therefore, from this point of view, it is preferable to attach the sensor 1 to the already-cut side grass division 3a without attaching a super divider and in which splitting does not occur during both row mowing and horizontal mowing. On the other hand, the automatic direction control of the combine harvester 5 is controlled based on the uncut side row of the cutting width.
The uncut weeding body 3b is always located between the rows, and if the sensor 1 is disposed on the weeding body 3b, the field scene can always be detected. Furthermore, in wet rice fields, if the sensor 1 is installed on the mown side grass cover 3a, the sensor will detect crawler tracks from the previous stroke, and there is a possibility that accurate height above the ground cannot be detected. Therefore, from this point of view, it is more desirable to attach the sensor 1 to the uncut side grass cover 3b.

(g) Effects of the device As explained above, according to the present invention, the grass dividers 3a and 3b are installed at an angle so that the rear parts of the grass dividers face inward of the fuselage, and the back side of the grass dividers is A non-contact type sensor 1 for mowing height detection is disposed in the area, so that the sensor is not interfered with by the support rod 2.
Since the structure is configured to be able to detect the field scene within the cutting width, the grass divider is supported by the support rod 2, and the sensor 1 is The field scene can be detected without being interfered with by the support rod 2, the field scene can be detected accurately and reliably, and highly accurate cutting height control can be performed. Furthermore, since the non-contact type sensor 1 for mowing height is placed on the back of the part of the weed splitting body 3a that is inclined toward the inside of the machine body and is biased inward of the machine body, the waves emitted from the sensor 1 and the reflection from the field surface are reduced. The wave is the support rod 2
It is possible to detect the ground height over a relatively wide area without being interfered with by the ground, and even if there is a protrusion such as a stone, the influence of the detection of the protrusion is small, allowing smooth and accurate cutting height control. It can be performed. Moreover, the non-contact type sensor 1 can be attached to the upper part of the grass divider 3a, and can be attached to the support rod 2 even without a long guide tube.
This prevents the sensor 1 from becoming clogged with mud or being damaged due to contact with obstacles, allowing stable ground height detection at all times and improving reliability. be able to. Further, a sensor 1 is mounted on a bracket 12 provided across the back surface of the grass division bodies 3a, 3b and the reaping section frame 11.
By fixing and arranging the weeding body, the structure of the weeding body becomes more robust, and the sensor 1 is fixed to the bracket 12, which together with the weeding body is an extremely robust member, and the ultrasonic waves emitted from the sensor 1 are There is no distortion in the emission angle and reception angle of the waves, and highly accurate detection of the height above the ground can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the weed section showing the installation of a non-contact type sensor according to the present invention, Fig. 2 is a partially cutaway side view thereof, and Fig. 3 is a combine harvester to which the present invention is applied. 4 is a control block diagram showing a cutting height control system, FIG. 5 is a front view showing the installation of a non-contact sensor according to a conventional example, and FIG. 6 is a side view showing a different conventional example. 1...Non-contact sensor (ultrasonic sensor), 2...
...Support rod, 3... Grass division, 3a... Already cut grass division, 3b... Uncut side grass division, 5... Combine harvester,
7... This machine, 9... Reaping section, 11... Reaping section frame, 12... Bracket.

Claims (1)

[Claims for Utility Model Registration] 1. A reaping section 9 is supported in front of the machine 7 so as to be movable up and down,
Further, in a combine 5 in which a grass splitting body 3 is fixed and installed at the front part of the cutting part via a linear support rod 2, the grass cutting body on the cut side or the uncut side is fixed and the rear part of the grass cutting body is A non-contact type sensor 1 for mowing height detection is disposed on the back side of the rear part of the weeding body so as to face inward of the machine body, and a non-contact type sensor 1 for mowing height detection is biased toward the inside of the machine body. A mowing height control device for a combine harvester using a non-contact type sensor, characterized in that the device is configured to be able to detect the field scene inside the support rod 2 without being interfered with by the support rod 2. 2. The mower according to claim 1, wherein the non-contact type sensor 1 is fixed to a bracket 12 provided across the rear surface of the weeding body and the mower frame supporting the support rod 2. Height control device.