JPH03143307A - Elevator-controlling hydraulic device in tractor - Google Patents

Abstract

PURPOSE:To make fine adjusting to height equalizing of working machine unnecessary and improve operability by constructing the working machine to transfer into position-controlling mode after releasing of working machine backing and rising-controlling mode. CONSTITUTION:In a tractor 1 having position-controlling mode keeping ground working machine 2 connected to rear part of machine body at fixed height and working machine backing and rising-controlling mode raising the working machine to fixed height in backing up of the machine body, the tractor is constructed so as to transfer into position-controlling mode after releasing of working machine backing and rising-controlling mode. By this construction, the working machine 2 is able to be returned to the height before backing up of the machine body at beginning of work with advancing the machine body, thus fine adjusting to height equalizing is not necessary and operability is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a hydraulic control device for raising and lowering a ground work machine connected to the rear of a tractor. The purpose is to automatically raise this ground-based work machine to prevent damage to the work machine.

[Prior art and problems to be solved by the invention] Conventionally,
As this type of device, one is known that, when the tractor is reversed, a working machine connected to the rear of the tractor is raised in conjunction with the reverse operation.

However, in the case of such conventional equipment, when the gear shift lever is moved to the reverse range, the work equipment immediately rises to the maximum raised position, and when the gear shift lever is returned to the forward range to move the machine forward, the work equipment also lowers. Moreover, the hydraulic control lever was also moved in conjunction with the lifting of the work equipment.

There was a problem in that when the work equipment descended again, the position of the hydraulic control lever changed, causing the height of the work equipment to change. Therefore, if the operator wanted to return the work machine to its original position, the operator had to move the hydraulic control lever again to adjust the clarity.

[Means for Solving the Problems] The present invention is proposed in view of the above-mentioned problems, and takes the following technical measures.

That is, it has a position control mode in which the ground work equipment 2 connected to the rear of the machine body is controlled to rise and fall to a set height, and a work machine retreat and rise control mode in which the work machine is raised to a predetermined island when the machine body is retreated. A hydraulic lifting control device for a 1 to 1 Heraktor is characterized in that it is configured to shift to a position control mode when the working machine rear tower ascending control mode is released.

[The present invention will be explained in detail based on the following examples. First, to explain the configuration, 1 is a rotary tiller, and 2 is a rotary tiller d. 5) The hydraulic lifting device 6 is connected to the rear part and is configured to be able to move up and down freely by a hydraulic lifting device 6 provided at the rear of the fuselage. , lift rods 8, 8, etc. which connect the lift 1 to the arm 7.7 and the lower link 4.4, and the lift arm 7.7 is moved up and down by a controller roll valve 12, which will be described later.

3- The rotary tilling equipment 2 includes a tilling section 9 which is driven by obtaining rotational power from the P'rO shaft on the 1-racter side, and a cover 1-Oll-, a cover for "covering the nigga" of the tilling section 9. This is a conventionally well-known structure consisting of a cover ↓1-, etc., which is rotatably supported at the rear end of the cover 10.

The control valve E2 is 1 of the hydraulic cylinder case 14.
The spool [3] is fitted into the control valve 2 in a state where it can be moved in the front-rear direction.

The spool ↓3 is connected to a co-moving shaft 15 that is pivotally supported on the side of the curved cylinder case 14 and a link group 16 in the same case t-4.
When this spool 13 slides back and forth, the rift l-arm 7.7 moves up and down.

The 1PL moving shaft 5 is controlled by a motor 17 instead of the conventional lever operation method.

A potentiometer 18 for detecting the co-movement angle of the rotary shaft 15 is attached to an extension of the co-movement shaft 15 to which the manual operating lever was attached. Rotation axis 15
and the motor ↓7 are interlocked and connected via a linking member 28 consisting of a link or the like 4-.

FIG. 4 shows the control circuit. Reference numeral 19 denotes a position setting device for setting the precision of the rift 1-arm 7.7, and this position setting device 19 is provided near the cockpit;
By operating this setting device 19, the lift arm 7
．． 7 can be changed, and the height of the rotary tiller 2 connected to the hydraulic lifting device 6 can be changed.

20 is a control unit that compares the signal from the setting device 9 with the signal from the potentiometer ↓8 and converts it into a voltage. 1. When the two signals are different, the motor is driven to make the two signals match. Four roads 21. The motor 17 is driven by outputting a control signal to the motor 17.

This control unit 20 is connected to a height setting device 22 for a work machine retreat/lift mode that lifts the work machine when the work machine is moved backward, and sets the lift position of the rotary tiller 2 when the machine moves backward.

When the speed change lever (not shown) is switched to the backward side to move the machine backward, the switch 23 is turned on, the relay 24 is activated, and the changeover switch 25 is switched from the position control mode to the work machine benefit -1 and ascending mode. The reference numeral 26 in the figure is a power source.

Next, the effect will be explained. When performing tillage work while moving the machine forward, first set the 1ir height of the rift 1-arm 7 using the position setting device 9, and lower the rotary tiller 2 to that height.

At this time, as shown in FIG. 4, since the J squirrel control path 1111 has position priority, 3J after the work machine! 1- Set work machine J- in elevation control mode, elevation 16', J? Do 1]
The road remains open.

Then, by operating the /& splash lever and causing the aircraft to retreat,
The switch 23 is turned on, the relay 24 is activated, and the changeover switch 25 is switched from the position control mode to the working machine backward and upward control mode.

Then, the motor 1.7 starts rotating, and the linking member 28,
Switch the spool 13 of the controller 1-roll valve 12 to the work machine lifting side via the rotation shaft 15 and the link group 1.6 in sequence, and set the rotary tiller 2 using the height setting device 22:
J? to raise the level of quality.

When the speed change lever is moved to the forward/reverse side in order to move the machine forward again, the switch 23 becomes O]='I.' again, and the work machine backward and upward control mode is canceled.

In this embodiment, when the working machine backward/upward control mode is canceled, it is immediately switched to the original position control mode, and the machine can be returned to the position before falling backward. For this reason, the tillage depth by the rotary tiller 2 does not depend on the forward and backward movement of the machine, and there is no need to adjust it with the lateral pressure lever as in the past.

The adjustment range by the height setting device 22 can be set arbitrarily, but it is the range from the position where the rotary tiller 2 rises slightly from the ground to the maximum raised position of the lift 1-arm 7. By setting the height above the ground within the range, the rear cover 11 will not dig into the ground or be deformed by colliding with a ridge when one aircraft is moving backwards.

In addition, if the setting device 22 is set so that the work equipment is raised to a position slightly higher than the ground, the rotary tillage device 2 can be brought close to the edge of the ridge, and the tillage can be carried out to the corner of the headland. This has the advantage of reducing the amount of uncultivated land.

7- [Effects of the Invention] As described above, the present invention provides a position control mode that maintains the ground work machine 2 connected to the rear of the machine body at a set height, and a position control mode that maintains the ground work machine 2 connected to the rear of the machine body at a predetermined height. In the tractor 1, which has a work equipment backward and upward control mode in which the work equipment is raised to a height, when the work equipment reverse and rise control mode is canceled, the tractor shifts to the position control mode. Once started, the work equipment 2 can return to the state it was in before the machine was moved backwards, which eliminates the need for fine adjustments to adjust the height of the work equipment, which was required in the past, and improves work efficiency. .

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a side view of the main part, Fig. 3 is a rear view of the main part with a part cut away, and Fig. 4 is a control It is a circuit diagram. Explanation of symbols 1 Tractor 2 Rotary tilling device 8-8 Engineering 9 0 2 Hydraulic lifting device Potentiometer Position setting device Control parts Setting device

Claims (1)

[Claims] 1) It has a position control mode in which the ground work equipment 2 connected to the rear of the machine is controlled to rise and fall to a set height, and a work machine retreat and rise control mode in which the work machine is raised to a predetermined height when the machine is moved backwards. A hydraulic elevation control device for a tractor, characterized in that the tractor 1 is configured to shift to a position control mode when the work equipment reverse and elevation control mode is canceled.