JPS5834985Y2 - Ground height detection device - Google Patents

Description

[Detailed description of the invention] The present invention detects the height of the work equipment above the ground by the rocking displacement caused by the contact with the ground of the grounding body, which is supported by the work equipment installed on the mobile aircraft so as to be able to swing up and down. The present invention relates to a height-above-the-ground detecting device configured as follows.

This detection device is installed, for example, in the pre-reaping section of a combine harvester, and raises and lowers the section to maintain the height of the pre-cutting section within a certain range in order to stabilize the cutting height. This is used to detect the actual height above the ground during control, but there are problems as described below.

When the machine is being operated, other objects may come into contact with the grounding body from the side, or the entire detection device may move upward through the grounding body due to a relatively large convexity that suddenly appears in the field. There is a risk that the detection mechanism of the detection device may be damaged or the support portion of the grounding body may be damaged.

The present invention aims to solve the above problem by improving the grounding body support structure in the detection device. Specifically, it solves the problem by using a means to absorb displacement, and gives directionality to the displacement absorption to achieve original accuracy. The purpose of this invention is to provide a height-above-the-ground detection device that can reliably detect the height above-the-ground.

First, an embodiment of the present invention will be explained based on the drawings.

The figure shows a combine harvester in which a reaping preprocessing section 3 is connected to the front part of the machine as a mobile body consisting of a crawler traveling device 1, a threshing device 2, etc., and as the harvester advances, the reaping preprocessing section 3 The planted stem culm is pulled up into an upright position by the front lifting device 4, the base end of the pulled stem culm is cut by the reaping device 5, and the cut stem culm is transferred to the vertical conveyance device 6 by the rear threshing device 2. The feed chain 7 of FIG.

Next, an automatic cutting height control mechanism for stabilizing the cutting height by maintaining the height of the cutting pre-processing section 30 above the ground within a certain range will be described.

That is, an elevating frame 8 that swings up and down about a fulcrum P for the main machine is provided, and this frame 8 supports the reaping pretreatment section 3, and a hydraulic cylinder 9 that drives the frame 8 to move up and down is provided. It is being

The reaping pre-processing section 3 is equipped with a device that detects the height of this pre-processing section 30 above the ground.

This detection device includes the lifting device 4 as shown in FIG.
The sensor box 11 is supported on the back of a stem culm divider 10 provided at the lower end (front end of the pretreatment section 3), and a grounding body 12 is pivotally supported in a vertically swingable manner. , detecting the fluctuation in the height above the ground as a vertical rocking displacement of the grounding body 12,
Further, this displacement position is configured to be electrically detected by a switch mechanism (not shown) within the box 11.

Then, the hydraulic cylinder 9 is telescopically operated based on the detection result of the height above the ground detecting device, and the reaping pre-processing section 30
It is configured to automatically raise and lower the elevating frame 9 so that the height above the ground is within a certain range.

Further, the grounding body 12 in the height above the ground detecting device is connected to the sensor box 11 as described below.

That is, a rubber elastic body 14 is fixed by baking to the end face of the horizontal shaft 13, which is rotatably supported by the sensor box 11 around its axis, in a posture along the axis of rotation. Another horizontal shaft 1 fixed to one end surface of the elastic body 14
5, the base of the grounding body 120 is engaged and connected so as to be relatively unrotatable.

According to the above configuration, the external force acting on the grounding body 12 in the lateral direction (direction perpendicular to the direction of rocking force) is absorbed by the deflection deformation of the elastic body 14, so that the grounding body 12 is Therefore, it will not be damaged even if it comes into contact with another object from the side or is pressed upward due to sudden contact with a convex portion.

In addition, apart from this effect, the amount of rocking displacement of the grounding body 12 for detecting the height above the ground acts on the elastic body as a torsional force, so it is not absorbed to a large extent and the original height above the ground is detected. is done accurately.

In addition, FIG. 3 and FIG. 4 show other embodiments of the present invention. A cylindrical elastic body 214 made of rubber is fixed by baking to the outer circumferential surface of the horizontal shaft 13 rotatably supported by the sensor box 11, and a pivot boss portion of the grounding body 12 is attached to the outer surface of the elastic body 214. It is fixed by baking when it is fitted onto the outside.

In carrying out the present invention, in the above embodiment, the grounding body 12 was exemplified by bending a plate material into a sled shape, but as shown in FIG. 1
7 may be used.

As is already clear from the above embodiments, the technical feature of the present invention is that an elastic body is provided along the swing axis of the ground body, and the ground body is fixed to the working device side via this elastic body. It is connected to the detection mechanism and has the following effects.

In other words, external forces from the lateral and vertical directions of the grounding body act on the elastic body as a bending force, and displacement in the swinging direction acts as a torsional force, so displacement in the lateral direction (bending) is easy. Even if it is absorbed by the elastic body, the displacement in the swinging direction (rotation) is difficult to absorb, and it was possible to provide directionality to the displacement absorption of the elastic body.

Therefore, the movement of the grounding body in the lateral and vertical directions is released by the flexural deformation action of the elastic body, and even if another object comes into contact with the grounding body from that direction, the detection mechanism and the grounding body support part of the detection device are While avoiding damage, the original purpose of detecting the height above the ground has become possible, and the detection results can be accurately transmitted without being adversely affected by the interposition of an elastic body.

[Brief explanation of the drawing]

The drawings show an embodiment of the height above ground detection device according to the present invention,
Figure 1 is a side view showing the front part of the combine, Figure 2 is a rear view of the ground detection device, Figures 3 and 4 are partial longitudinal rear views of another embodiment, and Figure 5 is an example of an application. FIG. 3... Working device, 12... Grounding body, 14...
...Elastic body.

Claims (1)

[Scope of utility model registration request] A height above the ground detection device configured to detect the height above the ground of a working device 30 based on the swinging displacement caused by contact with the ground of a grounding body 12 supported in a vertically swingable manner on a working device 3 installed on a mobile body. An elastic body 14 is provided along the swing axis of the grounding body 12, and the grounding body 12 is connected to the detection mechanism 11 fixed on the working device 3 side via the elastic body 14. A height above ground detection device characterized by: