JPH11196613A - Plow depth automatic controller of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plow depth automatic controller of tractors allowing a tilling device to efficiently plow and level mounded soils formed on field corners. SOLUTION: This control device is directed to a tractor which liftably supports a rotary tilling device switchable in the direction of rotation through a lifter in the rear section and which is provided with a plow automatic controller for controlling a plow depth according to a height of the rear cover 23 from the ground, wherein the control device is formed by setting such a plowing mode in the plow automatic controller as to upwardly raise a tilling device from a plow depth position set by the plow automatic controller to a shallower plow depth position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor automatic cultivation depth control device which can perform soil collecting when a rotary tilling device rotates in a reverse direction.

[0002]

2. Description of the Related Art In general, a rotary tilling device mounted on a rear portion of a tractor via an elevating mechanism is capable of tilling a rotary so as to be switchable between forward and reverse rotations, and a rear cover for covering a rear portion of the rotary. Tillage depth (tilling depth)
Is configured to automatically perform tilling at a predetermined depth set by the tilling depth setting volume.

[0003]

In the tilling operation using the tractor equipped with the conventional automatic tilling control device, when the rotary is rotated forward and the entire field is tilled, the rotary is rotated backward at four corners of the field by the rotary. The fluttered soil is intensively deposited, and a raised embankment is generated as shown in FIG. Therefore, in order to level the embankment, it is necessary to carry out a mulling operation performed by moving the body forward while rotating the rotary in the reverse direction.

When the soil burying operation is performed in an operation state of the automatic tilling control device, the soil is blown forward by the reversing rotary, so that the pressing force of the soil against the rear cover decreases, and the rear cover tends to descend. In this state, the cultivation depth is determined to be shallow, and cultivation (deep cultivation) is performed more deeply than necessary. Therefore, there is a drawback that the cultivation depth must be corrected by frequently operating the cultivation depth setting volume, the control lever and the like each time to raise and adjust the tilling device to perform a complicated burying operation.

[0005] Further, when the above-mentioned cultivation work is to be performed in a state where the automatic tillage control device is not operated, the vertical operation of the tillage device 2 can be adjusted by operating the manual operation lever with the intuition and experience of the operator in the same manner as described above. Therefore, there is a problem that the operation requires skill.

[0006]

According to the present invention, a rotary tilling device 2 capable of switching between forward and reverse rotation is supported by a rear portion of a tractor 1 via a lifting mechanism 3 so as to be able to move up and down. In a tractor provided with an automatic tillage control device that controls the tillage depth by using the tillage device, when the body is advanced while rotating the rotary 23 of the tillage device 2 in the reverse direction, the tillage device is set from the tillage depth set by the tillage automatic control device. The tilling automatic control device is provided with a mulching mode in which the hills 2 are sequentially raised to make shallow tilling.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a tractor, in which an engine is mounted from the front on a traveling body 1c having front wheels and rear wheels, and a control unit including a steering wheel and a seat is arranged.
A rotary-type tilling device is mounted on the rear part of the fuselage so as to be movable up and down via a lifting mechanism 3 and to be detachable.

The elevating mechanism 3 includes a lift arm 30 which is vertically driven by a hydraulic cylinder (not shown) on the traveling body 1c side, a lower link 32 connected to the lift arm 30 via a lift rod 31, and a tillage device. The PTO shaft 3L is configured by an upper link 33 having a hitch portion 35 for detachably attaching the cultivator 2 and detachably transmits the tilling device 2 mounted on the hitch portion 35.

The tilling device 2 has the same configuration as that of the conventional device, and includes a transmission case 22 provided with a tilling shaft 21 having a plurality of tilling claws 20 planted on both sides of a transmission frame 2a, a support frame (not shown), Rotary 23
The upper part of the rotary 23 is covered with a rotary cover (main cover) 25, and the rear is further covered with a rear cover 26 pivotally attached to the rear end of the rotary cover 25, and is provided above the transmission frame 2a. The top mast 27 is locked to the hitch portion 35, and the rear end of the lower link 32 is connected to the transmission frame 2a.

The tilling apparatus 2 constructed as described above
Is provided with a till depth detecting sensor 5 on a bracket 28 protruding from the rotary cover 25, and a sensor arm 50 of the till depth detecting sensor 5 and a bracket 51 protruding from the rear cover 26.
Is connected by a rod 52, and the vertical turning position of the rear cover 26 is detected by the same plowing depth control means as in the conventional device, and is set by an operation unit 6 (FIG. 3) described later based on this detection signal. The hydraulic cylinder of the elevating mechanism 3 is extended and retracted so as to have the set value to be set, and the plowing depth, that is, the plowing depth automatic control capable of performing the plowing depth adjustment control (hereinafter referred to as the plowing depth automatic control) during the plowing operation. Make up the device.

The set value of the automatic plowing depth control is shown in FIG.
The rotation angle [α] formed between the rotary cover 25 and the rear cover 26 shown in FIG. 4 can be adjusted by adjusting the tillage depth setting volume 60 provided on the operation unit 6. The operation unit 6 is installed on the right side of the seat of the control unit, and on the upper surface of the control box 6a,
A position control lever 61 for setting and operating the height of the tillage device 2 from the front and a tillage setting volume 6
0, a till depth sensitivity switch 62, a till depth manual switch 63, and a lift arm manual switch 64 are arranged behind the till depth setting volume 60 in the same manner as in the conventional apparatus. A mode changeover switch 65 or the like that displays "Deep auto" and "Earth" is provided, and these are connected to the microcomputer M provided on the traveling body 1c side.

When the mode changeover switch 65 is set to "automatic plowing depth" in the display, the plowing device 2 can smoothly perform automatic plowing depth control during normal rotation of the rotary 23 similarly to the conventional device. And the mode switch 6
When the mode is switched to "Milling a" in the display of No. 5, the embankment at the corner of the field, which is performed by rotating the rotary 23 in the reverse direction to be described later, can be easily performed. The embankment generated in the area can be satisfactorily leveled.

That is, when the mulling mode is incorporated in the microcomputer M of the automatic tilling control device, and the mode changeover switch 65 is switched to "landing", first, in the reverse rotation state of the rotary 23, the rotary operation performed in the previous process is performed. As with the automatic control of the working depth during normal rotation of
While maintaining the plowing depth of the predetermined depth set at 0, the embankment shown in FIG. 4 is started to be plowed as the machine body 1c advances.

Then, as shown by an arrow B in FIG. 5, when the tillage device 2 is sequentially raised and shallowly cultivated in accordance with the progress of the airframe 1c, the tilling device 2 is moved forward by a predetermined distance where the embankment portion M does not exist. The tilling automatic control device provided with the mulching mode is configured so as to be completed. Note that the mulching mode may be such that the rotary 23 rises continuously as shown in FIG. 5, or may be determined so as to rise stepwise at regular intervals or stepwise at irregular intervals. .

Therefore, the tractor 1 constructed as described above
When the mode changeover switch 65 is in the mode of “tiling automatic” b in FIG. 3, the normal tilling operation is performed by the tilling depth automatic control. Then, as shown in FIG. 4, when leveling the embankment portion M generated at the corner of the field by burying work, the tractor 1 is moved backward to a position where the rotary 23 is closest to the ridge portion of the field, and the machine is stopped. . Then, by switching the mode changeover switch 65 of FIG. 3 to the indicated “earth position” a, the body 1 c is made to travel forward while rotating the rotary 23 in the reverse direction.

By this operation, the rotary 23 can perform the shallow plowing in the mulching mode a sequentially while rotating in the reverse direction as shown in FIG. At this time, the soil of the embankment portion M is rushed forward by the rotary 23 or scatters forward to attempt to rise greatly in front of the rotary 23, but the rotary 23 sequentially rises with the advance of the tractor 1. As a result, the embankment portion M can be evenly and automatically leveled without causing a rise. Therefore, the burying work of the embankment M can be easily and efficiently performed without relying on intuition and experience as in the conventional apparatus, and without the complexity and incompleteness of manual operation.

[0017]

According to the present invention, a tractor provided with a mulching mode in the automatic tilling control device according to the present invention is set by the automatic tilling control device at the beginning of the mulling operation when the rotary is reversed and the machine body is moved forward. From the tillage depth of the predetermined depth,
The burying work can be performed while gradually shifting to shallow plowing depth.

Then, the soil is not thrown forward by the rotary and does not rise, and the rotary cover is prevented from being deeply cultivated. This burying operation can be performed simply and efficiently as described above.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a burrowing operation by an automatic cultivation depth control device for a tractor according to the present invention.

FIG. 2 is a side view showing a configuration of a rear cover.

FIG. 3 is a plan view of an operation unit.

FIG. 4 is a side sectional view showing a shape of an embankment portion.

FIG. 5 is a cross-sectional view illustrating an operation of a rotary at the time of burying work of an embankment portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tractor 2 Tillage device 3 Elevating mechanism 5 Tillage depth detection sensor 6 Operation part 23 Rotary 26 Rear cover 0 Tillage depth setting volume 65 Mode switch

Claims (1)

[Claims] 1. A tilling device that supports a rotary tilling device 2 capable of switching between forward and reverse rotation at a rear portion of a tractor 1 through a lifting mechanism 3 so as to be able to move up and down, and that controls a tilling depth by a ground contact height of a rear cover 26. In a tractor equipped with an automatic control device, when the fuselage is advanced while rotating the rotary 23 of the tillage device 2 in the reverse direction, the tillage device 2 is sequentially raised from the plowing depth set by the tillage automatic control device, and shallow tillage is performed. Automatic tractor tillage depth control system in which a cultivation mode is set in the automatic tillage control device.