JPH02276505A - Lift-controlling apparatus of tractor - Google Patents

Abstract

PURPOSE:To simplify the adjustment of the working position of a working machine and to facilitate the operation of the machine by controlling a hydraulic operation lever in such a manner as to move a ground-working machine to a position defined by a position-setting means when the lever is operated to a 2nd operation zone beyond a 1st operation zone. CONSTITUTION:A small pitch is selected and a hydraulic lifting mechanism lifts or lowers at a small pitch when a hydraulic operation lever 18 is operated within the 1st operation zone consisting of small ranges RU and RD. When the operation lever 18 is shifted beyond the 1st operation zone to the 2nd operation zone having wider operation range, the hydraulic mechanism lifts or lowers to the preset lifted position or lowered position set by a lift position setting device IU or a lowered position setting device ID. A ground-working machine can be accurately lifted or lowered to a prescribed position by the operation of single hydraulic operation lever 18.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a lift control device for a tractor.

The ground work equipment connected to this tractor has been miniaturized.

Alternatively, an attempt is made to provide an elevation control device that can be controlled at normal speeds.

[Prior Art] Conventionally, a minute lift lever for slightly raising or lowering a ground work machine and a lift lever for raising or lowering it to a normal size have been provided separately.

[Problems to be Solved by the Invention] When lowering the working height of a ground-based working machine to a predetermined position, for example, first,
The ground work machine is controlled to the predetermined position by operating the lift lever to the lower position to lower it almost to a predetermined position, and then operating the minute lift lever to lower it slightly, for example. It is difficult to operate the two types of lift levers in the upward or downward direction without fail while performing travel steering operations. Sufficient skill is required to grasp and operate the operating lever each time without making a mistake.

[Means for Solving the Problems] The present invention is devised so that minute lifting and lowering operations and normal lifting and lowering operations can be performed with a single hydraulic operation lever, and the configuration is similar to that of a ground-based work machine. 2, a means S1 for detecting the height above the ground of the ground working machine 2, and a hydraulic lifting mechanism 6 for raising and lowering the ground working machine 2. In the elevation control device for a tractor, the lifting and lowering operation range of the ground work equipment 2 by the single hydraulic operating lever 18 is divided into a first operation range in which the ground work equipment 2 moves slightly and a second operation range in which the ground work equipment 2 moves more. When the hydraulic operating lever 18 is operated beyond the first operating range to the second operating range, the ground work equipment 2 is controlled to move to the position determined by the position setting means IU and ID. This is what I did.

[Function] While the hydraulic operating lever 18 is being operated to the first operation range, which is the minute range (RU) or (RD), the set value of the minute amount is set, so the hydraulic lifting mechanism 6 is operated in the minute amount. While the hydraulic operating lever 18 is being moved to the second operating range, which is a larger operating range beyond the first operating range, the upper position setting device IU or lowering position setting device LD is used to move up or down. The ground work equipment 2 will be raised or lowered to the set raise position set value or lowered position set value, and in this way, by operating the single hydraulic operating lever 18, the ground work equipment 2 will be raised or lowered to a predetermined position accurately. Now I can do it.

[Embodiment and its operation] An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, a ground work machine 2 is connected to a tractor 1 by a work machine coupling mechanism 5 consisting of a mouth to whirling 3.3 at the lower left and right sides and a top link 4 at the upper center, and a hydraulic lifting mechanism 6 is used to lift the ground work machine 2. The left and right lift arms 9.9, which move up and down as the piston 8 of the cylinder 7 moves in and out, are connected to the lower link 3.9 through the left and right lift rods 10.10.
3, and the ground work I
The lift detection values of the lift sensor S, which is provided to detect the lift height of a2 (in the illustrated example, the rotation angle of the lift arm 9 is detected with a single rotation type potentiometer of 1 meter), match. In this way, an on/off operation command for the ascending solenoid valve 11 or the descending solenoid valve 12 is issued from a control section 13 composed of a microcomputer or the like via an ascending drive section 14 or a descending sliding section 15. It is configured to be amplified and output.

Each setting operation for the rising side setting value or the falling side setting value is performed by the rising position 12R, which is configured by something like a volume.
As illustrated in FIG. 5, the constant road setting device U and lowering position setter ID are provided near the cockpit 16 of the tractor 1, and as shown in a side view in FIG. A cam 19 is attached to the hydraulic operating lever 18, and a micro-up switch SU1, a micro-down switch SD, an up switch SU, and a down switch SD are installed using something like a micro switch.
Attach springs 20, 21, 22, and 23 to the machine frame, respectively.
The hydraulic operating lever 18, which is normally held in the neutral position, is moved in the arrow direction to the small operating cylinder 9N (first operating range).
When only RU is rotated, the cam 19 turns on the minute rise switch SU, and when only a small operation range (first operation range) RD is operated in the direction of the arrow, the minute drop switch SD1 is turned on. When operating beyond the operating range RU to the larger operating range (second operating range) in the arrow direction, the ascending switch SU is also turned on in addition to the minute ascending switch SU1, and the operating range RD & beyond is operated in the arrow direction. When the large operating barrel l1l (second operating castle) is operated in the upward direction, the downward switch SD2 is also turned on in addition to the minute downward switch SD, and while the minute upward switch SU remains on, the minute downward switch is turned on. For the amount α, the set value is set in steps (i.e.

α, 2α, 3α, etc.), and while the minute drop switch SD continues to be on, the minute drop '1&(-β
), the setting values are set in steps (i.e. -β, -2β, -
3β,...), the control unit 13 acts to increase the increase in
, while it continues to turn on, the rank rises II! The set value is obtained by sequentially adding the 11th minute amount α to the ascending position set value set by the 2 setting device IU, and in addition to the minute descending switch SD,
While the lowering switch SD continues to be on, the lowering position setting (11'7) set by the lowering position setter IL) is controlled so that it becomes the setting value in which a minute amount (-β) is sequentially added. section 13 acts so that when the hydraulic operating lever 18 is operated in the upward direction, the lift detection value matches the above-mentioned set value for the upward side, and when it is operated in the downward direction, the hydraulic control lever 18 is The control section 13 instructs the ascending drive section 14 or the descending moving section 15 to output an output so that the lift detection value matches the set value on the descending side, and this control operation is shown in a flowchart in FIG. It is shown in

Therefore, for example, when the hydraulic operating lever 18 is operated in the direction of the arrow U and is placed in the first operating range Rυ, the lift arm 9 continues to rise in steps by a minute amount, and in this state , when the hydraulic operating lever 18 is returned to the neutral position N in FIG. ” - The lift arm 9 is immediately changed to the lift position set value set by the lift position setter IU, and the lift arm 9 is raised by -1. continues to rise again in minute amounts.

In this way, for example, lift arm 9 is placed in the raised position.
Even if the setting value is held, when the operating member 18 is operated in the direction of the arrow and placed in the first operating range RD, the set value becomes very small.
&(-β), the lift arm 9 will continue to descend slightly, and the lowering switch S will decrease.
When D is operated to the ON position, the lift arm 9 quickly descends to a height corresponding to the lowering position setting value.

In the embodiment described above, it is used for so-called position control to set the vertical position of the ground work machine 2, but instead of the lift sensor Sj, a plowing depth sensor that detects the plowing depth of the ground work machine 2 is used. The present invention may be configured to set the plowing depth using a plowing depth lever and used for controlling the plowing depth.

[Effects of the Invention] Since the present invention is configured as described above, it has the following technical effects.

That is, when the hydraulic operating lever 18 is held in the first operating range, the hydraulic lifting mechanism 6 moves slightly.
Positioning of the ground work equipment 2 becomes easy, and when this hydraulic operation lever 18 is moved to the second operation range, the ground work equipment 2 quickly and accurately moves to the position set by the position setting means IU and LD. As a result, even an inexperienced person can easily adjust the working position of the ground work device 2.

Furthermore, since this position adjustment is carried out using the negative operating lever 18 instead of using two operating members as in the conventional case, there is no operational hassle and the handling is facilitated.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of the tractor, Fig. 2 is a control circuit diagram, Fig. 3 is a flowchart, Fig. 4 is a side view of the main part, and Fig. 5 is the main part. FIG. Explanation of symbols U D SU. S.D. SU2 SD□ Tractor ground work equipment Work equipment connection link mechanism Hydraulic lifting mechanism control unit Hydraulic operation lever Lift sensor Raise position setter Lower position setter Minute rise switch Minute descent switch Raise switch Lower switch

Claims (1)

[Claims] 1) Position setting means IU and ID for setting the raised position and lowered position of the ground working machine 2, means S for detecting the height above the ground of the ground working machine 2, and a hydraulic lifting mechanism for moving the ground working machine 2 up and down. 6. In a tractor elevation control device comprising:
A first operation area in which the ground work equipment 2 moves minutely in a lifting/lowering operation range of the ground work equipment 2 by the single hydraulic operation lever 18;
When the hydraulic operating lever 18 is operated beyond the first operating range and reaches the second operating range, the position setting means IU and ID reach the position determined by the position setting means IU and ID. A tractor elevation control device that controls the movement of a working machine 2.