JPS6240205A - Lifting/falling control apparatus of tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a lift control device LTC for a tractor, which enables minute lifting and lowering operations as well as normal lifting and lowering operations with a single operating member. It can be used for tractors, etc.

[Conventional technology]

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 are provided separately.

[Problem that the invention seeks to solve]

Adjust the working height of the ground work equipment to a predetermined position rat: For example, when lowering, first operate the lift lever to the lower position to lower it almost to the required foot position, then move the fine lift lever t''
For example, by slightly operating (: 1), for example, lowering (:), the ground work machine is controlled at a predetermined position. This is a book that is difficult to operate in the correct direction, and it requires sufficient skill to grasp and operate the control levers of the above-mentioned two-type chickens without making mistakes while keeping an eye on the position of the ground work machine. It is what you need.

[Means for solving problems]

This invention has been devised so that minute lifting and lowering operations and normal lifting operations can be performed with a single operating member, and its configuration is such that the work equipment is connected to the tractor (1) by a linkage mechanism (5). The ground work equipment (2) connected to the ground work machine (1) is provided so as to be freely raised and lowered by a hydraulic elevator m (6), and a lift sensor (S,) is provided to detect the lift height of the ground work equipment (2).
The tractor is configured such that the hydraulic lifting mechanism (6) is controlled so that the detected lift value of α matches the set value on the ascending side or the set value on the descending side, and the ascending position or the descending position tIL is adjusted respectively. While operating the ascending position setting device (IU) and descending position setting device (ID) to be set, and the small operation box within the operating range, press the rising switch f (SU,) or the descending switch (SD,
), the operating lever a9g, which acts to operate the minute rise switch (SU, ) or minute descent swing f (SD,), and the minute rise switch (SUl) or minute descent switch (SD□) operate. During this period, the set value setting operation is performed to raise or lower the set value in small steps.
Slight rise switch f (SU,) or small fall switch (S
D,) is operating, the hydraulic lifting mechanism (6) is operated so that the setting operation of the step-like rise or fall is added to the rise position set value or the fall position set value.
This is a tractor elevation control device characterized in that it has a control section a3 that controls.

[Effect]

Operation lever us's small operation range (RU), (RD)
While operating the small rise switch (SLI,)
Or, since the minute descending swing f (SDl) is activated and a minute amount set value is set, the hydraulic elevator 11 (6) can be raised or lowered stepwise by a minute amount. While the operation is in the operating range, in addition to the rising swing f(SU,) or the falling swing πSD,), the slight rising swing f(SU,) or the slight descending swing f(SD
, ) operates to raise or lower the set value of the raised position or lowered position set by the raised position setter (IU) or lowered position setter (ID), and performs a step in the minute amount mentioned above. Thus, by operating the single operating member as, the ground work equipment (2) can be accurately raised or lowered to a predetermined position.

〔Example〕

Next (An example of the 20 inventions will be explained based on the drawings. Figure 2 shows a side view. 31, +3
1 and a top link (4) at the upper center of the work machine, which is connected by a hydraulic lifting mechanism (6).
The movement in and out of the lift piston (8) of the lift cylinder (7) e: The left and right lift arms (9) move up and down accordingly.
.

(9) is connected to the lower links (31, (31) through the left and right lifts QG, QllK-,
! ! i1 Operator C: Therefore, the lift sensor (81) installed to detect the lift height of the ground work equipment (2) (in the illustrated example, the lift sensor The lift solenoid valve αD or the lower solenoid valve is connected to the lift solenoid valve αD so that the lift detection value of the arm (9) rotation angle t-1 (detected by the rotation type potentiometer) matches.
The ON and OFF operation commands for the closed valve can be controlled by something like a microcomputer! The rising drive section a4 or the descending drive ff11.
The mini #4 is designed to be amplified and output via +15.

Setting operations for the ascending side set value or the descending side set value are performed using an ascending position setter (IU) and a descending position setter (ID), which are configured with a volume or similar device.

As illustrated in Fig. 5, 62 tractors (11 driver's seats αQ
The cam a9 is attached to the operating lever which is provided near the cam and is rotatable about the axis a1, as shown in Fig. 4 g: l111 side view.
1[=1-ff, use something like a micro switch to set a small rising switch f (SUl) and a small falling switch f (S
D,), up switch 5U2), down switch SD,)
Attach them to the machine frame, respectively, and tighten the springs ■ and c! The operation Leno < -a which is normally held neutral by υ, @, @
8 by a small operating range (RU) in the direction of the arrow U, the cam (9) is L and the slight upward swing 'R is performed.
3U, ) is turned on, and the small operation range (
When only RJ)) was made 9 times, there was a slight downward swing f(SD,
) is turned on, and when the above operation range (RU) is exceeded and the operation range is larger than Large operation range g in the direction of the arrow beyond (RD): When operated, the minute lowering switch (SDI
), the lowering switch (SD, ) is also turned on (
= configuration, and while the slight rise swing f (SUl) continues to be on, the set value is set in steps for the minute rise 1 (i.e., α
, 2α, 3α, . , -3β
, . . .)), the rise position setter (I
The above minute amount ICA is applied to the rising position setting value set in U).
are added sequentially to -rL9 set value, and a slight downward swing is made.
In addition to "fC3D, ), while the descending switch (SD, ) also remains on, the descending position setting value C set by the descending position setting device (ID): The above minute amount (-β) is added sequentially. When the control section (13) is operated to set a precise set value, and the operating lever side is operated to the upward side, the above setting value on the upward side: Lift detection value is adjusted so that the detected value matches. When the lift detection value matches the set value on the descending side, the control section a3 commands the output of the ascending drive section Q4 or the descending drive section α5C, and the third The figure shows this control operation in the form of a flowchart.

Therefore, for example, while operating the operating lever Q8 in the direction of the arrow U and staying within the small operating range (RU).

Lift arm t91H will continue to rise in a stepwise manner towards the minute position. In this state, operate the
8 in the neutral position of Figure 4! ! If it returns to tN, the lift arm (9) will stop at that position and then move to the operating range (RU).
If the lift arm (9) is operated greatly in the direction of the arrow U beyond 't-, the set value will be changed to the set value of the lift position set by the lift position setting unit (IU), and the lift arm (9) will rise immediately. When the operation lever (Iυ) is held at its tt, the +17 toe arm (9) continues to rise slightly again.

In this way, for example, even if the foot arm (9) is held at the raised position tl (:11), when operating the operating member αa in the direction of the arrow (::) and placing it in the small operating range (RD), the setting The value will decrease successively to a minute amount - β), and the lift arm (9) will continue to descend by a minute amount, and when the lowering switch (SD) is operated to the ON position, the frame, The lift arm (9) is a type that quickly lowers 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 machine (2).
Instead of the lift sensor (SR), a plowing depth sensor is used to detect the plowing depth of the ground working machine (2), and the plowing depth is set at the bottom of the tank using the operating lever α. The invention may also be used, and even more conveniently, for tillage resistance control.

〔Effect of the invention〕

As described above in the tractor elevation control device It according to the present invention, 1: It is a stolen companion, and while the operating lever αIN is operated in a small operating range (RU) or (RD), a minute elevation switch is activated. (SU,) Also, minute down switch (SD
, ) operate to set a minute setting value, so the hydraulic lifting mechanism (6) is raised or lowered in minute steps in a stepwise manner. In addition to the upward swing f (SU2) and downward swing f (SD2), there is
, ) or minute downward swing fC8D1) operates to move up or down to the up position setter or down position set value set by the up position setter (IU) or down position setter (ID). At the same time, the ground work machine (21) can be raised or lowered in a predetermined position accurately by the above-mentioned step-like raising or lowering operation in the minute amount, and by opening the operation part 21 in this way, the ground work machine (21) can be moved up and down to a predetermined position. Therefore, Operation I: The required level of skill is small and fatigue can be reduced.

[Brief explanation of drawings]

Figure 1 shows a side view of a tractor, Figure WL2 shows a control circuit diagram, Figure 3 is a flowchart, Figure WL4 is a detailed view of the main parts, and Figure 5 shows the main parts of Figure 1. FIG. Code explanation (1)...Tractor (2)...
・Ground work equipment (5)...Work equipment connection link mechanism (6)...Hydraulic lifting mechanism a3...
Control part αF......operation lever

Claims (1)

[Claims] The ground work equipment, which is connected to the tractor by the work equipment connection link mechanism, is provided so that it can be raised and lowered by a hydraulic lifting mechanism, and the lift detection value of the lift sensor that detects the lift height of the ground work equipment is determined on the rising side. The tractor is configured such that the hydraulic lifting mechanism is controlled to match the setting value or the descending side setting value, and the tractor has a rising position setting device and a descending position setting device for setting the rising position or the descending position, respectively, and a small operating range. While operating in a large operating range, the minute up switch or minute down switch operates, and while operating in a large operating range, in addition to the up switch or down switch, the minute up switch or minute down switch operates. While the operating lever is operating, and the minute rise switch or minute fall switch is operating, the setting value setting operation of step-like rise or fall is performed in minute amounts, and in addition to the rise switch or fall switch,
While the minute rise switch or minute decrease switch is operating, the hydraulic control mechanism is operated so that the above-mentioned setting operation of a minute step-like rise or fall is added to the rise position set value or the fall position set value. 1. A tractor elevation control device, comprising: a control section for controlling.