JPS631783Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides an ultrasonic sensor on the upper part of the support frame of the weeding tool installed at the front lower end of the cutting device, and performs cutting based on the height above the ground detected by this ultrasonic sensor. The present invention relates to a reaping harvester configured to control height.

In conventional combine harvesters of this kind, it is necessary to detect the height of the front end of the reaping device from the ground to prevent it from plunging into a high place on the ground. Although it was installed behind the weeding tool installed at the tip of the device,
The weeding tool is supported by a support frame below its tip for strength reasons, while the ultrasonic sensor has the constraint that it must be installed as high as possible from the ground in order to maintain sufficient detection accuracy. Therefore, the ultrasonic sensor is necessarily disposed above the weeding tool support frame. Therefore, the ultrasonic sensor receives not only reflected waves from the ground but also reflected waves from the support frame, which not only complicates the signal processing system but also makes it difficult to accurately detect the height above the ground. However, the disadvantage is that it is difficult to control the cutting height appropriately.

The present invention was devised in view of the above circumstances, and its purpose is to provide an ultrasonic sensor behind the weeding tool and above the support frame, but with a simple signal processing system. The object of the present invention is to improve the structure so that it is possible to avoid malfunctions and control errors due to the presence of the support frame, and to realize this improvement with a configuration as simple as possible.

In order to achieve the above object, the reaping and harvesting machine according to the present invention is such that the vertical cross section of at least a portion of the support frame corresponding to the passage area of the ultrasonic waves, which is orthogonal to the longitudinal direction of the frame, is formed into a chevron shape that widens toward the end. It has characteristics.

According to the above characteristic configuration, even if the ultrasonic waves emitted from the ultrasonic sensor hit the support frame, most of the ultrasonic waves are reflected in a direction other than the sensor, and the ultrasonic sensor receives the ultrasonic waves from the support frame. There are very few reflected waves, that is, they are so weak that they can be ignored. Therefore, the ultrasonic sensor can almost receive only the reflected waves from the ground, so it can accurately detect the height above the ground without malfunction, and stable cutting height control can be performed. This led to this. Another advantage is that the signal processing system for the ultrasonic sensor can be configured as simply as possible since only the waves reflected from the ground are received.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front side view of a combine harvester as a reaping harvester. The reaping device 1 has a pulling device 2, a cutting blade 3, and a conveying device 4, and a weeding tool 5 (hereinafter referred to as a divider) is provided in front of the pulling device 2. This divider 5 is fixedly supported by a support frame 6 of the reaping device 1 at a position below the rear surface. An ultrasonic sensor 7 is disposed above the support frame 6 on the back side of the divider 5.

FIG. 2 is a front sectional view of a main part showing the specific shape of the support frame 6.
The longitudinal section of the frame 6, which is perpendicular to the longitudinal direction of the frame 6, is formed into a triangle shape that widens toward the end so that at least the upper portion of the portion corresponding to the passage area of the ultrasonic wave is shaped like a chevron. According to this configuration, the ultrasonic waves transmitted downward from the ultrasonic sensor 7 are
Since most of the waves are reflected laterally at the upper portion of the triangular support frame 6, the reflected waves from the support frame 6 are not substantially received by the sensor 7.

In the above embodiment, if the surface of at least the main part of the support frame 6 is made smooth by applying surface treatment such as plating to minimize diffused reflection, the waves reflected by the support frame 6 can be suppressed. This is even more effective in preventing sound waves from being received by the sensor.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the reaping and harvesting machine according to the present invention, and FIG. 1 is a front side view of the combine, and FIG. 2 is a front sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Reaping device, 5... Weeding tool, 6... Support frame, 7... Ultrasonic sensor.

Claims (1)

[Claims for Utility Model Registration] A weeding tool 5 provided at the lower front end of the reaping device 1
A reaping harvester is provided with an ultrasonic sensor 7 on the upper part of the support frame 6, and is configured to control the cutting height based on the height above the ground detected by the ultrasonic sensor 7, wherein the support frame 6
A reaping/harvesting machine characterized in that a vertical cross section of at least a portion corresponding to the ultrasonic wave passage area perpendicular to the longitudinal direction of the frame 6 is formed into a chevron shape that widens toward the end. The reaping harvester according to claim 1, wherein at least the surface of the chevron-shaped portion of the support frame 6 is smooth.