JPH0633774Y2 - Cutting height controller for combine harvester - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a cutting height control device in a combine using a non-contact type sensor such as an ultrasonic wave. The present invention relates to an arrangement structure of a cutting height sensor that is not interfered with by a grain culm drawn into a culm raising device.

(B) Conventional technology In general, the combine cutting height control device has a sensor arm hung from the lower surface of the cutting portion, and the height of the cutting portion is detected by contacting the arm with a field scene. , Sixth
As shown in the figure, in place of the contact type sensor, a non-contact type sensor that uses waves such as ultrasonic waves is used to measure the delay time from transmission to reception, and A cutting height control device has been devised to detect the height.

In the cutting height control device, the non-contact cutting height sensor 10 'raises the grain culvert supported by the linear cutting frame 5'on the rear surface of the divider 2'through the support member 4. It is mounted on a rod-shaped mounting member projecting from the support member 4 of the grain culm raising device 6 ', so as to be located behind the device 6'and above the cutting frame 5'.

(C) Problems to be solved by the invention However, in the above-mentioned cutting height control device using the non-contact type sensor 10 ', the sensor 10' is installed outside the cutting frame 5 '. , When running, there is a risk that the ridges may be touched and damaged. Therefore, inside the cutting frame 5 ', the transmitter 10'a and the receiver 10'b of the cutting height sensor 10' are provided.
It may be possible to arrange the slabs substantially parallel to the cutting frame 5 ′ along the traveling direction of the machine body, but as shown in FIG.
In this arrangement, the detection range a due to wave transmission / reception becomes laterally long with respect to the machine traveling direction, and since the cutting height control is performed by sampling control, it is easy to receive an erroneous signal such as a stock, There is a possibility that it may not be possible to accurately detect the ground height of the mowing unit.

Therefore, according to the present invention, the transmitter and the receiver are arranged in a direction orthogonal to the machine body traveling direction, and the sampling control also
Although it is difficult to receive false signals from stocks, etc., the wave transmitted from the transmitter does not reflect on the straight cutting frame, and even if the transmitted wave reflects on the grain culm, The purpose is to reduce the error by reflecting at the lower end of the culm.

(D) Means for Solving the Problem The present invention has been made in view of the above circumstances, and as shown in FIG. 1, for example, as shown in FIG. In a combine equipped with a non-contact type cutting height sensor 10 including a transmitter 10a that emits a wave such as the above and a receiver 10b that receives a reflected wave thereof, the transmitter 10a
And the receiver 10b are arranged substantially in the direction orthogonal to the machine body traveling direction so that the transmitter 10a is on the outside and the receiver 10b is on the inside, and the transmitter 10a is cut straight. The grain culms facing the inside of the frame 5 are provided behind the divider 2 provided at the front end of the mowing frame and after the grain culm raising device 6, and the grain culms divided by the divider based on the traveling of the machine are Mowing in a combine characterized in that the grain culm raising device is retracted in a direction away from the transmitter 10a, and the wave from the transmitter is configured not to be interfered by the grain culm that is pulled into the grain culm raising device. It is located in the height control device.

(E) Operation Based on the above configuration, when performing a mowing operation by the combine, waves such as ultrasonic waves are transmitted from the transmitter 10a of the mowing height sensor 10 toward the field scene G. Then, the wave is radiated to the plant base and the field scene G of the grain culm without being interfered with the side part of the grain culm k that has been pulled down by the grain culm raising device 6 and fell, and the reflected wave is further reflected. The reaper 1 is received by the receiver 10b.
The height above ground is detected. At this time, the cutting height sensor 10
Since the transmitter 10a and the receiver 10b are arranged in a direction orthogonal to the machine body traveling direction, the detection range by wave transmission / reception is vertically long with respect to the machine body traveling direction, and the transmitter 10a arranged outside the machine body A moving device 6 pulls the culms laterally away from the culm and prevents the spread wave from the transmitter from being interfered by the culms.

Further, the transmitter 10a is located behind the divider 2 desired inside the cutting frame 5 and has a straight shape.
In addition, the waves emitted from the transmitter 10a do not interfere with each other.

(F) Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

As shown in FIG. 2 and FIG. 3, in the reaper 1 of the combine, a divider 2 is fixed and supported by a linear support rod 3 at its tip 2a, and the support rod 3 is a straight rod. It is fixed and supported by the mowing frame 5. In addition, a grain culm raising device 6 is fixedly supported and installed behind the divider 2. Further, at a predetermined height behind the grain culm raising device 6, a direction sensor 7 is provided fixed to and supported by the mowing frame 5, and the direction sensor 7 is provided with a sensor directed inward of the machine body. An arm 7a is provided. Further, a mowing section side cover 9 is attached to the outer side of the machine of the grain culm raising device 6, and the cover 9 extends rearward of the machine so as to cover the side surface of the mowing section 1. A cutting height sensor 10 is installed behind the culm raising device 6.

As shown in FIG. 1, the cutting height sensor 10 is composed of a transmitter 10a that transmits an ultrasonic wave and a receiver 10b that receives a reflected wave of the ultrasonic wave, and the transmitter 10a and the receiver 10a. The transmitters 10b are arranged in the direction orthogonal to the machine body traveling direction so that the transmitter 10a is outside the machine body and the receiver 10b is inside. Further, the transmitter 10a is housed and arranged behind the grain culm raising device 6 and in a space s surrounded by the divider 2, the mowing frame 5 and the moving device 6,
Therefore, the transmitter 10a faces the inside of the straight cutting frame 5, and the divider 2 provided at the front end of the cutting frame.
And behind the grain culm raising device 6.

As a result, as shown in FIG. 2, the wave of the ultrasonic wave transmitted from the transmitter 10a is divided by the divider 2 based on the traveling of the airframe and pulled by the grain culm raising device 6 to be inclined. It is configured so that the ground height of the mowing unit 1 can be accurately detected by reflecting on the field scene G without being interfered by the side part of the grain culm k. In addition, L in FIG. 1 is a locus of the grain culm k drawn into the grain culm raising device 6, and 11 in FIG. 2 is a narrow guide.

Further, as shown in FIG. 4, the pulse generation circuit 13 is connected to the transmitter 10a via the transmission circuit 12 composed of an amplification circuit, and the AND circuit 17 is connected via the sawtooth wave generation circuit 15.
Connected to. The AND circuit 17 receives the signal sent from the receiver 10b through the amplifier 16, and the output from the AND circuit 17 is sent to the distance pulse generating circuit 19 together with the signal from the pulse generating circuit 13. Then, the signal of the circuit 19 is sent to the control circuit 18. In the figure, 20 is
Send a setting signal to the control circuit 18 so that the cutting height becomes a predetermined value.
It is a cutting height setting device such as a potentiometer.

Since the present embodiment is configured as described above, when the ultrasonic wave is transmitted from the transmitter 10a of the cutting height sensor 10 at a predetermined time during the harvesting work by the combine, the pulse generating circuit 13 causes the ultrasonic waves to be transmitted from the pulse generating circuit 13 shown in FIG. The timing pulse shown in FIG. 5 is output, and the pulse is further converted into the waveform shown in FIG. 5B via the transmission circuit 12 and transmitted from the transmitter 10a toward the field scene G. Further, based on the output of the pulse generation circuit 13, the sawtooth wave shown in FIG.
7 is transmitted, and as shown in FIG. 5D, the receiver 10b
Reflected waves from the sensor bar 7a and field scene G received at
The reflected wave b from is amplified by the amplifier 16 and is sent to the AND circuit 17 as waveforms a ′ and b ′ shown in FIG.
A pulse shown in FIG. 5F is combined with the sawtooth wave from the sawtooth wave generation circuit 15, and further a distance pulse generation circuit
It is sent to 19 and made into the distance pulse shown in FIG. As a result, the ground height of the mowing unit 1 is accurately measured based on the time delay of the ultrasonic wave received by the receiver 10b, and the measured distance and the preset value set by the cutting height setting device 20 are After being compared, the reaper 1 is appropriately controlled so that the measured distance matches the set value. In addition, the ultrasonic waves transmitted from the transmitter 10a are divided by the divider 2,
Since the waves are transmitted from the inside of the space s surrounded by the mowing frame 5 and the grain culm raising device 6, the wave motion thereof is drawn into the grain culm raising device 6 and slanted to the side portion of the grain culm k. Without being interfered with, it is always reflected on the stock source or field scene G of the grain culm k and received by the receiver 10b.

Further, the sawtooth wave generating circuit 15 has a threshold value that decays with time so as not to detect the sensor bar 7a of the direction sensor 7 so as not to be affected by noise in the cutting height detection. As you did, receiver 10b
By cutting the reflected wave b of the sensor bar 7a received by
Only the reflected wave B of the field scene G is detected. As a result, the cutting height sensor 10 detects the sensor bar 7a, so that the cutting height can be accurately controlled without causing a problem that the cutting unit 1 is not controlled to an appropriate ground height. Therefore,
The cutting height sensor 10 can be arranged without being influenced by the installation position of the direction sensor 7, and the cutting height sensor 10 can be placed at an optimum position in front of the direction sensor 7 and immediately behind the grain culm raising device 6.
By installing 10, it is possible to prevent the divider 2 from plunging due to improper height above ground.

(G) Effect of the Invention As described above, according to the present invention, the transmitter 10a and the receiver 10b are arranged substantially in the direction orthogonal to the machine traveling direction. The machine is vertically oriented so that it runs along the machine running direction, so that when the combine is run along the grain culm row and sampling control is performed at predetermined time intervals, false signals from stocks, etc. are less likely to be received, and the combine is averaged in the machine running direction. It is possible to perform accurate and quick cutting height control by detecting the detected cutting height detection value.

Further, since the transmitter 10a faces the inside of the straight cutting frame 5 and is arranged behind the divider 2 provided at the front end of the cutting frame 5 and after the grain stem raising device 6, the transmitter 10a is arranged.
It is possible to protect a without contacting the ridges and the like, and to prevent a wave from the transmitter 10a from interfering with the reaping frame 5, and to use a straight reaping frame 5 for a simple and robust structure. it can.

Further, the grain culm k divided into the dividers 2 is pulled into the grain culm raising device 6 and slanted, and the transmitter 10a is located behind the divider 2 and outside the body with respect to the receiver 10b. Therefore, the wave transmitted from the transmitter 10a can be transmitted toward the plant origin or the field scene G of the grain culm k without being interfered with the side portion of the grain culm k, etc. As a result, the height of the mowing unit 1 above ground can always be detected accurately, and proper cutting height control can always be performed without causing problems such as plunging the divider 2 into the field scene G.

[Brief description of drawings]

FIG. 1 is a plan view of a cutting unit showing a mounting structure of a cutting height sensor according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, and FIG. 4 is a control showing a cutting height control system. FIG. 5 is a circuit block diagram, FIG. 5 is a time chart showing respective waveforms output by the control circuit, waveforms of reflected waves received by the circuit, and FIG. 6 shows a conventional cutting height sensor installation structure. A front view and FIG. 7A are plan views showing a state in which the cutting height sensor is vertically arranged. And FIG.7 (b) is a figure which shows the detection range of the cutting height sensor in that case. 1 ... Mowing part, 2 ... Divider, 5 ... Mowing frame, 6
… Grain culm raising device, 10… Mowing sensor, 10a… Transmitter, 1
0b ... receiver, k ... grain culm, G ... farm scene, s ... space.

Claims (1)

[Scope of utility model registration request] 1. A non-contact type cutting height sensor comprising a transmitter for transmitting waves such as ultrasonic waves toward a field scene and a receiver for receiving reflected waves on one side of the mowing section. In the combine, the transmitter and the receiver are arranged substantially in the direction orthogonal to the machine body traveling direction so that the transmitter is on the outer side and the receiver is on the inner side. The grain culms facing the inside of the mowing frame and arranged behind the divider provided at the front end of the mowing frame and after the grain culm raising device, the grain culms divided by the divider based on the traveling of the machine,
In the combine harvester, the grain culm raising device is configured to pull in a direction away from the transmitter, and the wave from the transmitter is not interfered by the grain culm that is pulled into the grain culm raising device. Cutting height control device.