JPH055848Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an ultrasonic type height-above-the-ground system in which a transmitter and a receiver are distributed to the left and right above a support frame with a divider attached to the front end. A detection sensor is provided, and this sensor is installed on the top wall, left and right side walls,
A mowing height detection device for a combine harvester, which is covered with a weed removal cover having a weed removal cover, and an intermediate partition wall for preventing diffused reflection located between the transmitter and the receiver is provided inside the cover over the entire length of the cover. Regarding.

[Conventional technology]

In the above cutting height detection device, conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 58-135230, the height above the ground detection sensor is arranged on the rear side of a divider disposed at the front of the machine, There was one that was configured to be deployed at a location forward of the fuselage rather than the lower end of the support frame.

[The problem that the idea aims to solve]

In the conventional structure described above, an ultrasonic height detection sensor is installed immediately after the planted grain culm is distributed and divided, so that after the divider's weeding effect has disappeared, short weeds and There was a risk that grain culm grains and the like would get into the lower side of the detection sensor, making it impossible to accurately detect the height above the ground, and there was room for improvement.

Therefore, one possible way to solve the above problem is to set the lower ends of the left and right side walls of the cover at a lower level, but in this way, when low mowing is performed, the lower ends of the left and right side walls are extremely close to the field. If they approach or come into contact with each other, the planted grain culm stocks on the uncut side will be pushed down so strongly that they are buried in the field at the lower end of this side wall, and the grain culm stocks will not return to their upright position even after passing through the side wall. This may interfere with the next process of reaping.

The present invention aims to solve the above-mentioned problems.

[Means to solve the problem]

The characteristic configuration of the present invention is that, in the cutting height detection device for a combine harvester described at the beginning, the lower ends of the left and right side walls of the cover are set higher than the front lower end of the support frame, and the front lower end of the support frame is set at a higher position than the front lower end of the support frame. It is located closer to the front of the fuselage than the cover, and the lower end of the intermediate partition wall is set higher than the lower ends of the left and right side walls, and its functions and effects are as follows.

[Effect]

Even if the work is carried out in such a low cutting state that the lower front end of the divider support frame approaches or slightly protrudes into the field to reap a lodging grain culm,
An appropriate gap will remain between the lower ends of the left and right side walls and the field surface, and the grain culms that come very close to the divider will be pushed outward without any force through this gap, and after passing through the side walls. Grain culm stocks are erected and restored. Further, in this case, since a gap is also formed between the lower end of the intermediate partition wall and the field surface, the ultrasonic reflection path is not narrowed or blocked, and the cutting height can be detected correctly. Furthermore, since the lower ends of the intermediate partition walls are located higher than the lower ends of the left and right side walls, an ultrasonic reflection path can be secured even when the support frame enters the field and the lower ends of the left and right side walls come into contact with the field.

Moreover, the front lower end of the support frame is located closer to the front of the aircraft than the cover that covers the height selection sensor.
Since low weeds, grain culms, etc. are held down by the front lower end of the support frame until just before the height detection sensor detects them, the influence of diffused reflection from such low weeds can be reduced. Detection operations can be performed in a state of avoidance as much as possible.

[Effect of idea]

Therefore, according to the present invention, by rationally improving the structure, it has become possible to prevent the planted grain culm from being pushed down during low mowing and the deterioration of the mowing height detection function.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the front part of a traveling machine body 2 on which a threshing device 1 is mounted is provided with a lifting device 3, a reaping device 4, and a conveying device 5 for conveying and supplying the harvested grain culm to the threshing device. A divider 6 is inserted into and attached to the front lower end 7a of the support frame 7 to divide and spread out the planted grain culm at the front lower part of the support frame 7. Behind the divider 6 and above the support frame 7 is covered with a cover 8 which has a tapered shape in plan view. A reaping section 10 of the combine harvester is configured by providing a ground height sensor 9.

Further, the reaping section 10 is attached to the traveling body 2 via a hydraulic cylinder 11 so as to be able to swing up and down.

As shown in FIGS. 2 to 4, the embodiment of the present invention uses an ultrasonic sensor as the non-contact height detection sensor 9 above the ground, and the details will be explained below.

The sensor 9 is a transmitter 9a that emits ultrasonic waves intermittently.
The automatic mowing height detection device calculates and detects the height above the ground based on the elapsed time from the transmission of the transmitter 9a to the reception of the receiver 9b. Based on this detection result, a hydraulic valve (not shown) is operated to drive the cylinder 11, and the height of the reaping section above the ground is maintained at the set height. Vertical frame 7b connected to the front of 7
An intermediate partition wall 12 whose rear end is bent into an L-shape is welded and fixed to each of the frames 7b and 7 over the back surface of the support frame 7 and the upper surface of the support frame 7. Nuts 13, 13 are welded and fixed to the L-shaped portion 12a, and the upper end of the L-shaped portion 12a is cut away over the entire width in the lateral direction to form a notch portion 12b. Moreover, the protruding surface 14 is flat over the entire width in the vertical direction.
A horizontally long support member 1 formed by bending a backwardly.
The transmitter 9 is installed at both end steps on the side of the protruding surface 14a of 4.
A and receiver 9b are arranged and fixed with bolts to form a sensor unit. Further, the upper protruding surface 1 of the plate 15 as a vertically elongated wall plate is longer than the supporting member 14, which is formed by bending the flat protruding surface 15a forward over the entire vertical width in the same manner as described above.
5a is a support member 1 constituting the sensor unit;
The protruding surfaces 14a of the middle partition wall 12 are brought into contact with each other and fixed with bolts, and the L-shaped portion 12a of the intermediate wall 12 is fixed so that the supporting member 14 fits into the notch 12b.
The bolts 16, 16 are screwed into the nuts 13, 13, and are tightened and fixed.

Furthermore, brackets 18 and 18 having through holes 17 and 17 are welded and fixed to the left and right side surfaces of the vertical frame portion 7b connected to the front portion of the support frame 7, respectively, so that the vertical frame portion 7b and the brackets 18, 18
In between, there is an upper wall 8a that is tapered in plan view and lowers in the front;
A cover 8 having a pair of left and right side walls 8b, 8b with lower edges rising rearward, and opening downward and rearward.
The cover 8 is attached to the vertical frame 7b so as to cover the sensor 9.

The left and right side walls 8b, 8b and the middle spacer wall 12 are arranged so that the height from the ground becomes higher in this order: the front lower end 7a of the support frame 7, the lower end of the left and right side walls 8b, 8b, and the lower end of the middle spacer wall 12. The front lower end 7a of the support frame 7 is located further forward than the cover 8 in the fuselage. Note that the substantial lower end of the intermediate partition wall 12 becomes the lower surface of the portion of the support frame 7 to which the intermediate partition wall is attached.

20 in the figure is a protector fixed to the lower surface of the support frame 7 immediately in front of the reaping device 4 in order to prevent weeds and straw debris from getting caught and accumulating between the reaping device 4 and the support frame 7. It is.

As mentioned above, the ground height detection sensor 9 is installed behind the divider 6, and after receiving the weeding action of the divider 6, the grain culms and weeds that try to get under the sensor 9 continue to have a tapered, forward-sloping shape. The cover 8 allows for smooth weeding and prevents grass from entering directly under the sensor 9. Also, since the plate 15 covers the rear opening of the cover 8, straw waste, grain culm, etc. accumulated on the frame 7 can be removed. Even if it grows as the work progresses, it is prevented from entering the cover 8 and causing the sensor 9 to detect it incorrectly. Also, the left and right side walls 8b, 8
Because the lower edge of b is raised backwards, it is difficult for mud to enter into the cover 8 in wet fields, etc., and it is also easy to get stuck and slip out backwards as the aircraft advances, and during weeding, it is difficult for mud to enter the cover 8. It has become something that cannot be harmed.

Further, the intermediate wall 12 is connected to the transmitter 9a and the receiver 9.
Since it is installed upright between the intermediate partition walls 12 and 12, it functions as a partition wall that prevents the signal from the transmitter 9a from being short-circuited and transmitted to the receiver 9b.
The directivity of the signal is improved by the cover side walls 8b, 8b.

[Brief explanation of the drawing]

The drawings show an embodiment of the cutting height detection device for a combine harvester according to the present invention, in which FIG. 1 is a side view of the front part of the combine, FIG. 2 is a partially cutaway side view of the sensor mounting part, and FIG. FIG. 2 is a view taken along the - arrow, and FIG. 4 is an exploded perspective view of the sensor and the sensor cover. 6... Divider, 7... Support frame, 7a...
...Front lower end, 8...Cover, 8a...Cover top wall, 8b...Cover left and right side walls, 9...Sensor, 9
a... Transmitter, 9b... Receiver, 12... Intermediate wall.

Claims (1)

[Scope of utility model registration request] An ultrasonic ground height detection sensor 9 has a transmitter 9a and a receiver 9b distributed to the left and right above a support frame 7 with a divider 6 attached to the front end.
In addition, this sensor 9 is attached to a weed removal cover 8 having a top wall 8a and left and right side walls 8b, 8b.
The mowing height detecting device for a combine harvester is provided with an intermediate partition wall 12 for preventing diffused reflection located between the transmitter 9a and the receiver 9b and provided inside the cover 8 over the entire length of the cover. , the lower ends of the left and right side walls 8b, 8b of the cover 8 are set higher than the front lower end 7a of the support frame 7, and the front lower end 7a of the support frame 7 is positioned closer to the front of the fuselage than the cover 8. and the intermediate partition wall 1
A cutting height detection device for a combine harvester, in which the lower ends of 2 are set higher than the lower ends of the left and right side walls 8b, 8b.