JPH02276504A - Lift-controlling apparatus of tractor - Google Patents

Abstract

PURPOSE:To safely and accurately operate the subject apparatus by setting the lifting and lowering work range of a ground-working machine to a neutral zone, the 1st operation zone and the 2nd operation zone and constructing an operation lever in such a manner as to always return to the neutral position. CONSTITUTION: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. When the hand is released from the operation lever 18, the lever 18 is immediately returned to the neutral position to stop the lifting and lowering motion of the working machine. The operation of the machine can be safely and accurately carried out by this mechanism.

Description

[Detailed Description of the Invention] [Industrial Application Field] The second invention relates to a lift control device for a tractor, and is capable of miniaturizing a ground work machine connected to the tractor.

Alternatively, it is an object of the present invention to provide an elevation control device that can be controlled at a normal speed.

[Prior art v#] 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 were provided separately.

[Problem to be solved by the invention wA] When lowering the working height of a ground work machine to a predetermined position, for example, first, the lift lever is operated to the lowered position, and approximately
The ground work equipment is controlled to a predetermined position by lowering it near a predetermined position and then operating a minute lift lever to lower it slightly, for example. It is difficult to operate the elevator levers in the ascending direction or descending direction without making any mistakes, so it is necessary to manually operate the above two types of operating levers each time without making a mistake while keeping an eye on the position of the ground work equipment. It requires sufficient skill to hold and operate it.

[Means for Solving the Problems] The present invention solves the problems of micro elevating and lowering operations and ordinary systems. It is devised so that the lowering operation can be performed with a single hydraulic operating lever, and its configuration includes position setting means IU and ID for setting the ascending position and descending position of the ground-based work equipment 2, and In a tractor elevation control device comprising means S for detecting the height of the ground-based work machine 2 above the ground, and a hydraulic lifting mechanism 6 for raising and lowering the ground-based work machine 2, the ground-based work machine 2 is controlled by a single hydraulic operating lever 18. The lifting and lowering operation range of the ground work equipment 2 is divided into a neutral range, a first operating range in which the ground work equipment 2 moves slightly, and a second operating range in which it moves more widely.
An operating range is set, and a second operating range is set outside of the second operating range, and when the hydraulic operating lever 18 is operated beyond the first operating range to the second operating range, the position setting means IU, ID
The ground work machine 2 is controlled to move to the position determined by , and the hydraulic operating lever 18 is configured to always return to the neutral position.

[Function] While the hydraulic operating lever 18 is operated in the first operation range, which is the minute range (RU) or (RD), the setting 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 operated to the second operating range, which is a larger operating range beyond the first operating range, the upper position setter IIJ or the lowered position setter II
), the ground work equipment 2 will be raised or lowered to the set value of the raised position or the set value of the lowered position set in In addition to being able to move up and down, if you let go of the hydraulic operating lever 18, this lever 18 immediately returns to the neutral position and stops the up and down movement of the ground work equipment 2, so it can be operated safely and accurately. It can be operated.

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

As shown in FIG. 1, a ground work machine 2 is connected to a tractor l by a work machine coupling mechanism 5 consisting of lower links 3.3 at the lower left and right sides and a top link 4 at the upper center. The left and right lifts 1 to arms 9, 9, which move up and down simultaneously as the piston 8 of 7 moves in and out, are connected to the lower and link 3 via left and right lift rods 10 and 10.
, 3, and is provided to detect the lift height of the ground work equipment 2 according to the upward setting value or the downward setting value set by the operator. In this case, the co-movement angle of the lift arm 9 is detected by a rotary potentiometer 1 meter) -tt Turn on and off the raising solenoid valve 11 or the lowering solenoid valve 12 so that the detected lift values match. The operation command is amplified and outputted from a control section 13 made up of a microcomputer or the like via an ascending movement section 14 or a descending drive section 15.

The operation of setting the set value on the ascending side or the setting value on the descending side is performed by using the ascending position setting device IU and descending position setting device ID, which are configured by a volume or the like, on the tractor 1 as illustrated in FIG. A cam 19 is attached to a hydraulic control lever 18 which is provided near the cockpit 16 and is rotatably provided on a shaft 17, as shown in side view in FIG. Up switch SU1, minute down switch SD, up switch SU, down switch SD8
are attached to the machine frame respectively, and the hydraulic operating lever 1 is normally held in the neutral position by springs 20, 21, 22, and 23.
8, the small operation range (first operation range) RU in the direction of arrow U
Only when operating the rotation.

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 descent switch SD is turned on.
When operating in the direction of arrow U beyond the above operating range RU to a larger operating range (second operating range), the slight rise switch S
In addition to U, the ascending switch SU is also turned on, and a large operation range (second
In addition to the minute lowering switch SD, the lowering switch SD is also turned on when operated in the operating range).
While the minute rise switch SU continues to be on, the minute bolt α is
destination, the setting values are set in steps (i.e. α, 2α, 3α, etc.)
...), and while the minute drop switch SD continues to be on, the set value for the minute M(-β) increases in steps (i.e., -β, -2β).

-3β, . . .), and while the slight rise switch SU and the rise switch SU continue to be turned on, the rise position setter IU sets the - The above minute amount α is sequentially added to the ascending position setting value, and as long as the descending switches SD and l continue to be on in addition to the minute descending switch SD, the setting value is set by the descending position setter ID. A minute amount (-β) is added to the lowering position set value.
The control unit 13 operates so that the set values are sequentially added, and when the hydraulic operating lever 18 is operated to the upward side, the lift detection value matches the set value on the upward side. When operated on the descending side, the control section 13 instructs the ascending sliding section 14 or the descending drive section 15 to output so that the lift detection value matches the set value on the descending side, FIG. 3 shows this control operation in a flowchart.

Therefore, for example, while the hydraulic operating lever 18 is operated in the direction of the arrow U and placed in the first operating range RIJ, 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 WIN in FIG. The lift arm 9 is changed to the lift position set value set by the lift position setting device IU.
will rise quickly, and when the hydraulic operating lever 18 is held as it is, the lift arm 9 will continue to rise again towards the minute pin.

In this way, for example, the 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 will change by a minute amount (
-β), the lift arm 9 will continue to descend by a minute amount, and the lowering switch SD,
When the lift arm 9 is operated to the ON position, the lift arm 9 quickly descends to a height corresponding to the lowering position setting value.

In the above-mentioned embodiment, it is used for so-called position control to set the vertical position of the ground work IIa2, but instead of the lift sensor S, 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 continuously rises to the position set by the position setting means IU and ID. As a result, it is possible to accurately move the ground work machine 2 to the target position without overshooting the target position.

In addition, there is a first micro-operation area outside the neutral area.
The operating range is provided, and a second operating range that moves significantly outside of the operating range is provided, and the hydraulic operating lever 18 is configured so that the lever 18 always returns to the neutral range when the operator releases his/her hand. It becomes easier to grasp and confirm the neutral position.

If an inexperienced operator makes a mistake in operation and becomes in a dangerous situation, the ground work machine 2 can be stopped immediately by simply releasing the hydraulic control lever 18, which is safe.

[Brief explanation of drawings]

The figures show an embodiment of the invention, in which Figure 1 is a side view of the tractor, Figure 2y4 is a control circuit diagram, Figure 3 is a flowchart,
FIG. 4 is a side view of the main part, and FIG. 5 is a perspective view of the main part. Explanation of symbols 1 Tractor S U D SU. S.D. SU2 SD. Ground work equipment Work equipment connection link mechanism Hydraulic lifting mechanism control section Hydraulic operating 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 of the ground working machine 2 above the ground, and a hydraulic lifting mechanism for moving the ground working machine 2 up and down. 6. In a tractor elevation control device comprising:
The range of lifting and lowering of the ground work equipment 2 by the single hydraulic operating lever 18 is divided into a neutral range and a first range where the ground work equipment 2 moves slightly.
The hydraulic operating lever is divided into an operating range and a second operating range that moves larger than the operating range, and the first operating range is set outside the neutral range, and the second operating range is further outside the neutral range. 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, and the hydraulic operating lever 18 is always kept neutral. A tractor elevation control device, characterized in that it is configured to return to a position.