JPH0479802A - Controller for lifting and lowering - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus with simple operation by providing a lower limit changing means for changing the position set value when a plowing depth setter is operated to the shallower side than the shallowest set position. CONSTITUTION:If the tilting operation level is higher than the supporting level of a machine body, a plowing depth setter 9 is operated to the shallower side than the shallowest set position of the plowing depth to change the position set value to the lifting side by a lower limit position changing means (C) without performing the operation of a position setter 11. Thereby, a tiller can be lifted to a desired operating height by operating the plowing depth setter.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for achieving a method in which the set plowing depth by a manually operable plowing depth setting device matches the detected value by means for detecting the actual plowing depth of a rotary tilling device. automatic tillage depth control means for controlling the elevation of the tillage device; and position control means for controlling the elevation of the tillage device until the set height relative to the machine body by the position setting device matches the actual measured height of the tillage device relative to the machine body. The present invention relates to an elevation control device, wherein the tilling depth control operation is performed only when the tilling device is located above a height set by the position setting device.

[Conventional technology]

In the above-mentioned lifting control device, conventionally, during tilling work,
The height set by the position setting device is always set lower than the tillage level (for example, see Japanese Patent Laid-Open No. 2-49505).

[Problem to be solved by the invention]

With the conventional structure, no problem occurs when the position is always below the plowing level or the vehicle body support level, such as in dry fields, or for example, in the case of puddling work for paddy fields, the position is below the vehicle body support level by the hard platen. However, the level of plowing work due to the mud surface was higher than that of the previous one, resulting in the following inconveniences.

In other words, even if the operator sets the plowing depth setting device to the shallowest position when plowing, if the tiller is raised relative to the machine, due to the characteristics of the link mechanism, the tiller will
Since the rear is curled up, the rear cover for detecting the actual plowing depth will be lifted above the set plowing depth, and the automatic plowing depth control will not work. In this case, it is only possible to perform plowing work to form a mud surface on the hard disk. In this case, is it possible to deal with this by changing the lower limit set value using the position setting device upward?Generally, operation using the position setting device is used to forcibly raise the tillage device significantly from the field, In use, operation is confusing,
I was hoping for an improvement in this regard.

An object of the present invention is to eliminate the above-mentioned disadvantages.

[Means to solve the problem]

A characteristic configuration of the present invention is that, in the elevation control device described at the beginning, the tilling depth setting device is configured to be operable further in the tilling depth direction than the shallowest tilling depth setting position; There is provided a lower limit position changing means for changing the set value in the position control means to the upward side with priority over the setting of the position setting device.

[For production]

When working in a field where the machine support level and the plowing level are approximately equal, the plowing depth setting device can be used to set the plowing depth in a setting area deeper than the shallowest setting position. Able to perform work.

When the plowing work level is higher than the machine support level, such as plowing work, by operating the plowing depth setting device to the shallower side than the shallowest setting position, the position setting device can be adjusted to the position without operating the position setting device. The set value is changed to the upward side.

〔Effect of the invention〕

Therefore, the operator only has to operate the plowing depth setting device during plowing work, and is freed from operational confusion.Even during plowing work, etc., the operator only has to operate the plowing depth setting device to the desired working height. It became something that could be raised.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Fig. 3, a riding tiller is constructed by connecting a rotary tiller (2) to the rear of the riding machine through a three-point linkage mechanism (1) so that it can be raised and lowered and rolled left and right. be. The three-point link mechanism (1) consists of a pair of left and right lower links (3), (3), and a top link (4) in the center.
A pair of left and right lift arms (6) which are driven by a lift cylinder (5) to swing up and down the left and right lower links (3) and (8).

(6) is lifted and connected via lift rods (7), (7), one lift rod (7) is configured to be extendable and retractable by a rolling cylinder (8), and the tilling device (2) is connected to the lift cylinder ( It is constructed so that it can be moved up and down by driving the cylinder (5), and can be rolled by driving a rolling cylinder (8).

Then, there is a means (
10) in order to match the detected value by the tilling device (2).
automatic plowing depth control means (A) for controlling the elevation of the tiller (A), and an automatic plowing depth control means (A) for controlling the elevation of the tiller (
2), and the tilling depth control operation is performed only when the tilling device (2) is located above the height set by the position setting device (11). It is structured like this. To be more specific, there is an operation dial (15) in a control box (14) provided on the top of the rear fender (13) next to the driver's seat (12).
A potentiometer-type tillage setting device (9
), and a potentiometer-type position setting device (11) that can be operated by a position lever (16) that can be freely swung back and forth is provided near it, and the rear cover (17) of the tilling device (2) is aligned with the horizontal axis. The relative vertical movement amount of the cover (17), that is,
A potentiometer-type plowing depth sensor (1o) configured to detect the actual plowing depth and detect the relative swing angle of the lift arm (6), that is, the height of the tillage device (2) relative to the machine body. A lift arm sensor (18) is provided.

As shown in FIG. 1, the side setting device (9), (11)
The signals from both the sensors (10) and (18) are input to a control device (19) equipped with a microcomputer, respectively, and the control device (19) has the automatic plowing depth control means (A) and the position control means. (B) is provided as a control block and is configured to control the solenoid valve (V) for the lift cylinder (5). Then, position setting device (11
) is configured such that the control operation by the automatic tillage depth control means (A) is performed only when the tillage device (2) is located above the set height. Therefore, when raising the tilling device (2) greatly, operate the position lever (16) largely to the upward side, and during the tilling operation, move the position lever (
16) to the lowest position.

The plowing depth setter (9) is configured to be operable further in the plowing depth direction from the shallowest plowing depth setting position, and in the operation range, the setting value in the position control means (B) is adjusted in accordance with the operation. A lower limit position changing means (C) is provided which gives priority to the setting of the position setter (11) and changes it to the upward side. More specifically, as shown in FIG.
The rotary adjustment is possible, and the rotary operation between scale 2 and scale 10 is configured to allow the tilling depth to be set by the automatic tilling depth control means (A).In other words, the scale It is provided so that it is at the operation position "2" or the shallowest plowing depth setting position, and is configured to restrict rotation in the shallower direction from this position by a check mechanism (not shown). When performing plowing work at a level higher than the ground level of the machine, the restriction on the check mechanism is released by operating the operating tool (2o), so that the operation can be performed in a shallower direction from the scale "2". It is configured. An electrically controlled switching circuit (21) is installed in the signal path of the tillage depth setting device (9).
is interposed so that the output signal can be switched between a state where it is used for controlling the plowing depth control means (A) and a state where it is used for controlling the position control means (B). The switching operation is configured to be performed by a comparator (22) that outputs a low level when the output signal level is on the larger tilling depth side than the scale "2", and outputs a high level when the tilling depth is on the small side. However, when operating in a direction shallower than the scale "2", the output signal is given as a set value to the position control means (B) via the level inversion circuit (23) and the switching circuit (24).

Second, with this configuration, even during plowing work, the level of the tilling device (2) can be raised to the desired tilling level by operating only the tilling depth operation dial (15). be.

In addition, if the main power is turned on or off when the position setting value is forcibly increased using the tillage depth operation dial (15) as described above, the level of the tillage device (2) before operation is maintained, and the control device (19), and which forcibly raises the tilling device (2) to a predetermined high level by pressing the operation switch (25), the above-mentioned set value and the forced raise instruction level are set. The above-mentioned level maintenance operation is continued until they match, and then the above-mentioned control operation is performed, so as to protect the power supply and ensure work safety by preventing the tilling device (2) from moving up and down. It's like this.

The lower limit position changing means (C) includes, instead of a hardware configuration,
It may be built into the control device (19) in the form of a program.

It should be noted that the present invention is not limited to the structure shown in the accompanying drawings by adding reference numerals in the claims for convenient comparison with the drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the elevation control device according to the present invention, and the first embodiment
The figure is a control block diagram, the second figure is a plan view of the setting dial,
FIG. 3 is an overall side view of the agricultural tractor. (2)... Cultivation device, (9)... Cultivation depth setting device, (10)... Detection means, (11)...
...Position setting device, (A) ...Plowing depth control means, (B) ...Position control means, (C
)...Lower limit position changing means.

Claims (1)

[Claims] The tilling device (2) is controlled to raise and lower so that the plowing depth set by the manually operable plowing depth setting device (9) and the value detected by the means (10) for detecting the actual plowing depth of the rotary tiller (2) match. automatic plowing depth control means (A) and position setting device (
position control means (B) for controlling the raising and lowering of the tilling device (2) so that the height set relative to the machine by the tiller (11) and the actual measured height of the tilling device (2) relative to the machine coincide; ), the tilling depth control device is configured to perform the tilling depth control operation only when the tilling device (2) is located above a set height according to It is configured to be operable further in the plowing depth direction than the shallowest depth setting position, and in the operation range, the setting value in the position control means (B) is prioritized over the setting of the position setting device (11) in accordance with the operation. An elevator control device equipped with a lower limit position changing means (C) for changing the position to the upward side.