JPS62158410A - Apparatus for controlling plowing resistance - 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] The present invention relates to a tilling resistance control device, and proposes a tilling resistance control device devised to obtain appropriate control sensitivity depending on the soil condition of the field. It is applicable to plowing operations using electronically controlled equipment.

[Conventional technology]

One way to judge whether or not draft control is being performed normally is to assume that the operating state is normal when changes in tilling resistance are transmitted to the operator in the form of minute, stable, sustained vibrations. If no vibration is felt, control the ground work equipment to lower it a little, etc.≦
:Thus, tillage resistance can be appropriately controlled.

[Problem that the invention seeks to solve]

However, due to the hardness and softness of the soil at the site, the sense of resistance conveyed to the operator varies considerably.For example, the sense of resistance is small in soft soil, so the amount of lowering is likely to be large. The plow depth is also often excessive.

[Means for solving problems]

This invention α1 was devised to be able to adjust the sensitivity in the lowering direction during the second stage of production, and was devised so that the plow depth could be appropriately controlled depending on the soil quality. In the IR configuration, one work equipment connection link mechanism (5) and two are used to supply pressure oil to the lift cylinder (8) of the ground work equipment (2) storage, which is connected to the tractor (1), and the hydraulic lifting mechanism (91). F&T can be raised and lowered freely by the a discharge control side.

Tilling resistance setting 1 set with the draft setting device (engineering)
A tilling resistance control device including a control unit α1 that directly commands the supply of pressure oil and the μ discharge control so as to directly match the pjf tilling resistance detection value detected by the draft sensor (S2). In this step, the opening control of the descending proportional valve I which controls the discharge of pressure oil is performed so that the discharge flow rate of the pressure oil near the start of the descending operation of the ground work machine (2) during work can be made variable. This is a tilling resistance control device characterized by having a g degree adjustment section (1) for

[Effect]

By operating the sensitivity adjustment section [ti-↓, the discharge flow rate of pressure oil from the lift cylinder (8) near the start of the downward movement of the ground work equipment (2) during work will be changed, so for example, if the pressure oil is By operating the sensitivity 04 node +i (l) in the soil where the discharge flow rate is small, it is possible to prevent the plow depth from becoming excessive and to achieve appropriate draft control.

〔Example〕

Next, an embodiment of the present invention will be described based on the drawings.

As shown in the WJZ diagram, the rear C of the tractor Il+: A plow as an example of ground work equipment (2) is attached to a pair of lift arms (3+, +31 on the left and right, 11 lifts on the left and right +4).
1, (111!f (71C
Therefore, the 11 foot arms (31, +31) are connected to this work equipment connection link mechanism (7) using hydraulic pressure.
The lift cylinder 8) (=Therefore, the hydraulic lifting mechanism (9) for lifting and lowering rotation (9)E is configured to perform lifting and lowering operations.

The control unit III consists of a 9-mouth micro combinator for supply and discharge control of pressure oil to the lift cylinder (8)-a and a micro combinator.
IU) command is issued to the ascending drive unit Uυ or the descending drive unit UN
The rising proportional solenoid valve Q3 and the descending ratio ψ11 are amplified by the opening and closing operation of the solenoid valve A4.

Due to this, pressure oil from the pump (15) is supplied to the lift cylinder (8), and the lift arm (3) rises.

The lift cylinder (8) is configured so that the pressure oil is discharged and the lift arm (3) is lowered.

For example, a height setting device (2) with a 9-hole volume control (aFBL) and a height sensor (2) formed by attaching the detection shaft of a potentiometer to the lift arm (3).
S,)? r, respectively, are connected to the control unit (1G), and the height detection value detected by the height sensor (Sl) matches the height setting value set by the operation of the height setting device (■ρ). As shown, a lifting command is output from the control unit α to the raising drive unit (111 or the lowering drive unit α2), thereby performing the lifting control, and is used as a draft sensor (S2) to detect tilling resistance. , for example, the draft rod QG connected to the front part of the truck j 11 link (6) is connected to the draft spring Uη
plowing resistance force C: Therefore, the weight of movement moving forward is
If the tilling resistance is set by using a potentiometer O& (one that detects the noise), the draft sensor (S2) is set to the tilling resistance detection value set by operating the draft setting device (Step 2), which is composed of something like a volume. The C1 control unit σG with which the detected tilling resistance values match outputs a lifting/lowering command for the ground working machine (2), thereby performing draft control.

The ascending proportional solenoid valve α3 and the descending proportional solenoid valve (141, the specific circuit of which is illustrated in FIG. The rising proportional solenoid valve α3 is configured so that the pressure oil of the pump (i5) is supplied to the lift cylinder (8) when the pump (i5) is opened, and the solenoid (21a) of the lowering valve (1111) is energized so that the pressure oil of the pump (i5) is supplied to the lift cylinder (8). The pressure oil in the back chamber (ZZa) is discharged, the boat 22b) is opened, and the pressure oil in the lift cylinder (8) is discharged through the reverse valve. , and the on-width of the pulse dL flow was changed according to the command of the control unit α, and the off-width was widened. (i.e. narrows to off-width).

Both the ascending solenoid cell 113 and the descending solenoid cell I have a large flow rate.

Then, by switching and operating the sensitivity selector switch @, as illustrated in FIG. (per unit time), i.e. lift cylinder (
8), that is, the change rate of the discharged oil amount -ft'f-, which is the control amount for the bias value, and the song + in the same figure.
Like #a+b*c.

It is configured with an adjustable sensitivity adjustment section.

The g2 configuration is such that the amount of oil discharged at 1 g near the start of the downward movement of the ground working machine (2) during draft work can be changed to several shares.

Therefore, when using one song ma, it is curved.

Compared to C, the amount of descent of the ground working machine (21) with respect to the bias value is smaller, and the draft sensitivity is smaller, making it suitable for control in fields with soft soil, for example.

Note that, as shown by curve A, there is no sensitivity-node relationship between the bias value of the ascending proportional solenoid a3 and the amount of oil supplied.

At code (to), the ground work machine (2) is activated by the input operation.
For example, it is a lift switch for performing a simple raising or lowering operation to a desired height.

It is configured such that the first ON operation starts the upward movement 1r, and the first ON operation≦2 starts the downward movement.

In addition to using the above-mentioned draft sensor (S, )i as a means for inspecting the grounding operation, a separately provided grounding sensor may be used.

〔Effect of the invention〕

The plowing and resistance control device according to the present invention is configured as described above, and the pressure oil level 11 near the start of the descending operation of the ground working machine (2) during work is adjusted by operating the sensitivity adjustment part IHt. Since the discharge flow rate from the foot cylinder (8) will be changed, 1, for example, in the case of soft ±1 f,
By operating the sensitivity adjustment part LIt so that the discharge violet becomes smaller, the plow depth can be prevented from becoming excessive and appropriate draft control can be achieved. It is possible to properly perform draft work using suitable sensitivity corresponding to various conditions C2.

[Brief explanation of drawings]

An example of this invention shown in the figure? Figure 1 is a control circuit diagram, Figure 2 is a front view of the tractor, Figure 3 is a detailed view of the main part of Figure 1, and Figure 4 is a sensitivity characteristic diagram. Code explanation (1)...Tractor (2)...
・Ground work equipment (2a)...Blade part (5)...
...Work machine connection 11 link mechanism (8)...II
Aftlinda (91...Hydraulic lifting mechanism■...
...Proportional solenoid valve α for lowering --- Control section ■... Sensitivity adjustment section (■2) ...
・・Draft footing device (S2)・・・Draft sensor patent applicant Iseki ik+& Taishiki company---1 ゛Representative Masu filler Takashi Hayashi ・Figure 3j4 Figure 4

Claims (1)

[Claims] The ground-based work equipment, which is connected to the tractor by the work equipment connection link mechanism, can be raised and lowered by controlling the supply or discharge of pressure oil to the lift cylinder of the hydraulic lifting mechanism, and the tilling resistance set value is set by the draft setting device. In order to match the tilling resistance detected by the draft sensor,
In the tilling resistance control device having a control unit that commands the supply or discharge control of the pressure oil, the discharge flow rate of the pressure oil near the start of the downward movement of the ground work machine during work is
A tilling resistance control device comprising a sensitivity adjustment section for variably controlling the opening of a descending proportional solenoid valve that variably controls the discharge of pressure oil.