JPH0620326Y2 - Rear cover structure of working part of ground work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rear cover structure of a working part of a ground work vehicle capable of detecting a working depth by means of an inclination angle of the rear cover.

[Problems to be Solved by Prior Art and Invention] Today, in a ground work vehicle such as an agricultural tractor, for example, when a rotary tiller is attached as a working unit, the plowing depth (working depth) is detected by a rear cover. There is a method that is performed by detecting the inclination angle of. However, there are some soft fields in the field, and in this case, if the rear cover covers the surface of the cultivated soil, the surface of the cultivated soil becomes flattened so that it is crushed by the rear cover, resulting in a sharp digging. There is a fear that oxygen supply to the cultivated soil will be interrupted and the soil will become oxygen-deficient. Therefore, in such a case, tillage is conventionally performed without using the rear cover. However, if this method is used, it is not possible to automatically control the working depth by detecting the working depth based on the tilt angle of the rear cover. However, there is a drawback that a device such as a tail wheel is required separately.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 56-10303, it is proposed that the rear cover be divided and a part of the rear cover be used to detect the working depth.
Since the cover part for detecting the working depth is on the left and right outer ends, even if the working part is slightly tilted to the left and right, the detected value will vary greatly, and accurate working depth detection cannot be performed. There is a problem that the depth of plowing is detected at the cover portion on the outer end side, and this needs to be averaged, so that the number of parts is large and the structure becomes complicated.

[Means for Solving the Problem] The present invention was conceived with the object of providing a rear cover structure for a working part of a ground work vehicle capable of eliminating these drawbacks in view of the above circumstances. In the ground work vehicle in which the ground work unit is vertically movable on the traveling body, the rear position of the ground work unit can be vertically adjusted via a pair of left and right pressure rods supported by the support frame. And the rear cover lower surface can be transformed into a non-acting position in which the lower surface of the rear cover is in contact with the field scene and a non-acting position in which the rear cover is separated from each other. A narrow intermediate cover unit located at is formed so as to be connectable and separable, and the intermediate cover unit among the above cover units is It is characterized in that it is linked to a working depth detection sensor.

Further, according to the present invention, according to this configuration, it is possible to eliminate the pressing of the surface of the tilling soil by the rear cover as much as possible while automatically controlling the working depth based on the detection by the single working depth detection sensor. It is the one.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, and a rotary type tilling working section 3 is provided behind the traveling machine body 1 via an elevating link mechanism 2. The working part 3 is of a side drive type, but is constituted by members such as a plowing blade 4 and a rear cover 5.

The rear cover 5 is pivotally supported on the rear end portion of the upper cover 6, but is divided into left and right cover units 5.
a, 5b, 5c. The middle cover unit 5b has the narrowest width, and the inner edges of the both side cover units 5a, 5c are superposed on the both side edges from the upper side, and are integrated by a fixing tool 5d such as a butterfly nut. The lower surface (flat surface) is connected so that it is flush. The outer edge of the left and right cover units 5a, 5b is elastically held so that it can be transformed into a non-flat posture in which it is folded inward and a flat posture in which it can be projected outward and wide and flat. Auxiliary flat plates 6 are provided respectively.

A sensor bracket 7 is attached to the intermediate cover unit 5b.
The base end of the sensor rod 7a, whose tip is connected to the sensor bracket 7, is connected to one of the swing arms 8 pivotally supported on the upper cover 6. One end of a connecting wire 9 is connected to the other end of the swinging arm 8 beyond the pivot axis 8a. The connecting wire 9 is extended to the side of the machine body 1 and installed in the wing portion 10 of the machine body 1. It is connected to the plowing depth detection sensor 11. And cover unit 5
When b is vertically swung, the plowing depth is detected based on the swing angle.

Further, the lower ends of the pressure rods 12 are pivotally supported by the left and right cover units 5a, 5c, and the upper portions of the pressure rods 12 are attached to a support frame 12a extending from the main body side of the working unit 3, For example, by inserting / removing a member such as an R pin, the lower surface can be adjusted in a vertically adjustable manner so that the lower surface can be transformed from a working position in contact with the field scene to a non-working position separated from the field scene.

The machine body 1 is provided with a control unit 13 configured by using a micro computer, and the plowing depth detection sensor 1
The detection signal from 1 and the setting signal from the working depth setter 14 are input, and based on these signals, a control command is issued to the control valve 16 that controls the hydraulic cylinder 15, and the working depth detection value is the working depth setting value. By issuing a control command so as to match with, the automatic working depth control is performed.

In the embodiment of the present invention configured as described above, when performing the plowing work in a normal field, the whole cover unit 5 is used.
Tillage work will be carried out as usual in the state where a, 5b, and 5c are integrally connected, but in a soft field, the rear cover 5
If there is a risk that the surface of the cultivated soil will be soaked by the above, the fixing unit 5 will be attached to the cover unit that has been integrally formed.
The cover units 5a, 5c on both the left and right sides are lifted upward to set them in a non-working posture in which the lower surface is separated from the field scene. In this state, only the middle narrow cover unit 5b is in contact with the ground, and when plowing work is performed in this state, the cover unit 5b is inclined according to the plowing depth, and this inclination angle is It is detected by the depth detection sensor 11, and automatic tilling depth control based on this is performed.

In this way, the present invention is implemented in which the tilling depth can be automatically controlled by detecting the tilling depth by the tilling depth detecting sensor 11, but when the field is soft,
Only the narrow intermediate cover unit 5b connected to the tilling depth detection sensor 11 is grounded, and the other both side cover units 5a, 5c are set in the non-acting posture.
It is possible to reliably prevent a problem that most of the surface of the cultivated soil is pressed and picked up by the rear cover 5, and it is possible to automatically perform highly accurate cultivating work.

In addition, since the cover unit 5b connected to the working depth detection sensor 11 is an intermediate one, the end cover units 5a and 5b are provided with the working depth detection sensor due to an error in the case of slope work. It is also convenient because it has a smaller size and can detect the working depth with higher accuracy using a single detection sensor.

Further, since the working depth detection sensor 11 is provided on the machine body 1 side instead of the working section side, the sensor 11 itself can be arranged at a portion effectively protected from mud and There is an advantage that the structure can be simplified without much consideration for waterproofness and strength as in the case where it is provided. However, in implementing the present invention, the working depth detection sensor 11 is It does not matter even if it is provided on the working unit 3 side.

[Effects] In summary, since the present invention is constructed as described above, when performing ground work in a soft field, the cover units are separated from each other and attached to the left and right sides on the pressure rod. It suffices to lift up the cover unit and set it in the non-working position, and only the narrow intermediate cover unit will be pressed at the intermediate position of the working width between the left and right pressing rods. It will be grounded in the field under its own weight without being loaded by the rod, and as a result, the working depth detection will be systematically performed at the intermediate position of the above ground working width which is less affected by the inclination of the ground working part. Therefore, the ground work in the state where the rear cover minimizes the pickling of the field,
It will be possible to accurately perform even on temporary slope work,
Even in the temporary soft field, it is possible to perform highly accurate ground work with automatic work depth control without the need for using a tail wheel.

[Brief description of drawings]

1 is a side view of an agricultural tractor, FIG. 2 is an operation explanatory view, and FIG. 3 is a working view, showing an embodiment of a rear cover structure of a working part of a ground work vehicle according to the present invention. 4 is a block circuit diagram of the control mechanism, and FIG. 5 is a hydraulic circuit diagram. In the figure, 1 is a traveling machine body, 3 is a working part, 5 is a rear cover, 5
Reference numerals a, 5b and 5c are cover units, and 11 is a plowing depth detection sensor.

Continuation of front page (56) References Actually open 57-1507 (JP, U) Actually open 56-10303 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A ground work vehicle in which a ground work unit is provided on a traveling body so as to be vertically movable, and a rear cover provided on the ground work unit is vertically moved through a pair of left and right pressure rods supported by a support frame. The position of the rear cover is adjustable so that the lower surface of the rear cover can be transformed into a non-working position in which it is separated from a working position in contact with a field scene.
The cover units on both the left and right sides to which the left and right pressure rods are attached respectively, and the narrow intermediate cover unit located between them are formed so that they can be connected and separated.
A rear cover structure for a working portion of a ground working vehicle, wherein an intermediate cover unit of the cover units is connected to a working depth detecting sensor.