JPH0239802A - Working rotational speed changeover device in rotary tiller - Google Patents

Abstract

PURPOSE:To provide the title device so designed that a control means to actuate a regulation mechanism to make a changeover from high working rotational speed to low working rotational speed based on the lifting instruction to a rotary tiller is provided, thereby preventing danger and drop-off of working efficiency due to engine stalls. CONSTITUTION:When a rotary tiller 3 is in a state above the ground, its working rotational speed is set at low level. Whether the rotary tiller 3 is in this state or not can be recognized by the signals form a potentiometer 8 since a rear cover is in a dangling state. When a tilling work is to be made by making the tiller descend form the above state, a timer 29 is actuated just when the rear cover touches on the ground, and after a specified time has passed, a high-speed side hydraulic clutch HC is actuated 'on' to make a changeover to high working rotational speed. Thereby enabling a soil raising in early tilling and engine stalls to be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a working rotation speed switching device for a rotary tiller, which is configured to be attached to a machine body so that the rotary tiller can be raised and lowered.

[Conventional technology]

Conventionally, the rotation of the rotary tiller was stopped when the rotary tiller rose a certain amount above the ground, and started rotating when the rotary tiller descended a certain amount from the raised state [Japanese Patent Laid-Open No. 54-54804]. .

[Problem to be Solved by the Invention] In a device that controls the rotation of the rotary as described above, when the rotary tilling device which is in the raised state is lowered when starting work from a stopped state, the rotary tilling device It starts rotating before it touches the cultivated land. therefore,
If an auxiliary worker or the like who does not know the rotation return control of such a rotary tiller is nearby, the rotary tiller will suddenly start rotating, which may lead to a dangerous situation.

In addition, since the rotary tiller is rotating at the same full rotation speed as when tilling even before it touches the ground, a sudden load is applied the moment it touches the ground, and there is a risk that unexpected situations such as engine stalling of the driving part may occur. was there.

An object of the present invention is to provide a system that avoids the above-mentioned dangerous situation by making simple changes to the rotation control of a rotary tiller, and does not cause a decrease in work efficiency due to engine stalling or the like. It is in the point of doing.

[Means to solve the problem]

The features of the present invention are: (1) An adjustment mechanism is provided to vary the working rotation speed of the rotary tilling device; (2) The rotary tilling device is lowered and the working rotation speed is set at a low speed for a predetermined period of time immediately after it touches the ground, and at the same time, a predetermined period of time has elapsed. (1) A control means is provided for operating the adjustment mechanism to switch from the high-speed working rotational speed to the low-speed working rotational speed based on a command to start raising the rotary tiller. , and its effects are as follows.

0 action] ■Characteristic structure ■From ■, the rotary tiller rotates unless the operator stops it consciously. Therefore, when the engine is started when starting work from a stopped state, the rotary tilling device also starts rotating, and even if the rotary tilling device is in a floating state above the ground, it is in a state of rotating at a low speed.

◎ According to characteristic configuration ■, the rotation speed is low immediately after touching down. Therefore, unlike in the conventional case, a sudden load is not applied when the vehicle touches the ground, so engine stalling and the like are less likely to occur. In addition, if the rotation speed is high immediately after touching the ground, the plowed mud will be piled up high on the uncultivated ground, as shown by the imaginary line in Figure 2, while as the plowing progresses, the same high speed rotation speed will be applied. Even at the rotation speed, the mud is thrown up on the plowing surface, so the mound is not as high as on the left, and the plowing start point (a) is large and has a noticeable drawback,
By starting plowing at a low working rotational speed and then switching to a high working rotational speed, the amount of heaping up due to plowing can be approximately equalized.

0 In addition, when stopping plowing and raising the rotary tiller, if the rotary tiller is raised while maintaining high speed rotation, the tilled mud will be thrown up backwards from the rotary tiller, as shown in Figure 3. As shown, a hole (b) corresponding to the amount of sinking of the rotary tiller that is not filled with mud may be formed at the end of the tillage and become conspicuous. Therefore, by switching to a low working rotational speed at the end of the plowing, the hole (b) can be made as small as possible and unnoticeable.

〔Effect of the invention〕

■ Effect ■ When the engine is started, it rotates at a low speed, and unlike conventional methods, the rotary tiller does not suddenly start rotating on the way down. This allows the person to pay attention to the fact that the rotary tiller is in a rotating state, making it possible to increase the degree of safety compared to the conventional method.

(2) Deterioration of work efficiency due to engine stalling etc. can be avoided, and irregularities in the plowing surface can also be eliminated due to the action O9○.

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

As shown in Fig. 4, a low-client ground work device (3) is connected to the rear end of the traveling machine (1) via a two-point linkage mechanism (2), and a hydraulic cylinder (4) provided on the machine body side. Lift arm (5) that moves up and down with a link mechanism (2)
are connected via a lift arm (6) to form an agricultural tractor-type working machine that can drive and lower the ground working device (3).

This tractor has a control mechanism that can perform two types of automatic control: position control that raises and lowers the ground work device (3) to a set height relative to the machine body, and plowing depth control that maintains the ground work device (3) at the set plow depth. It is equipped with

That is, a potentiometer (7) is installed at the base end of the lift arm (5) to detect the height of the ground work device (3) relative to the aircraft.
), and a potentiometer (8) for detecting the plowing depth of the device (3) from the amount of rocking of the rocking rear cover (3a) is attached to the ground working device (3), and A control box (11) containing a control device (10) in the formed driving part (9) is located on the side of the seat (12), and a lever (
13) is provided.

As shown in FIG.
) panel has a switch (14) that can be switched between 2 positions, 0N-OFF, and a dial-operated tilling depth setting device (15).
), a dial-operated plowing depth control sensitivity setter (16), and a rise setter (17).

The operating lever (13) is configured to be of a -axis swing type, and a potentiometer (18) for position setting is attached to the base end of the lever (13). By setting it to (X), the working device (3) can be raised or lowered to the first predetermined height relative to the aircraft corresponding to the operating position of the lever (13), and an operating area connected to this operating area (X) can be set. By setting it to (Y), two operations (X) and (Y) are discriminated based on the output from the potentiometer (18) so that the automatic plowing depth control state is established.

Then, when the operating lever (13) with a control system configured as shown in FIG. 1 is set to the operating range (X), a signal from the potentiometer (18)
Control is performed based on a feedback signal from a potentiometer (7) attached to the switch (
14) to the ON state, and turn the operating lever (13)
When set to the operating range (Y), the potentiometer (18
), the automatic tilling depth control is activated by the signal from the tilling depth setting device (1
Control is performed based on a signal from 5) and a feedbank signal from a potentiometer (8) that detects the swinging of the rear cover (3a).

Also, if the operating lever (13) is set to the operating range (Y) with the switch (14) set to OFF, the working device (
3) descends under its own weight to the limit that it can descend, and becomes in a so-called floating state in which it follows the unevenness of the ground and floats.

The above describes the operating lever (13) and the potentiometer (7).
) as a position setting device, the control device (10) is also referred to as position control means, and the plowing depth setting device (15),
The rear cover (3a), the operating lever (13), the potentiometer (7), etc. are referred to as automatic plowing depth control means.

Note that when automatic control is performed, the electromagnetic valve (v4) for the hydraulic cylinder (4) is operated using an output signal from the control device (10). In addition, the control box (1
1) is equipped with a momentary lift switch (19) as an operating tool that forcibly raises the working device (3) to an arbitrarily set height, giving priority to automatic plowing depth control and position control.
) is provided, and when this switch (19) is pressed and operated, the lamp (20) lights up and at the same time raises the working device (3) to the height relative to the aircraft set by the rise setting device (17), and then press again. When operated, the lamp (20) goes out and the working device (3) returns to its original control state. Further, the tilling depth sensitivity setting device (I6) is connected to the working device (3).
It is also used as a switch to raise and lower the
By operating D), (M), and (U), the working device (3) is lowered, placed in a neutral state, and raised again.

The control device (10) has a built-in microprocessor and is configured to perform the two types of automatic control according to a preset program.

Next, control of the working rotation speed when a rotary tiller is used as the working device (3) will be explained. First, the adjustment mechanism (21
) will be explained. As shown in Fig. 1, a low-speed oil clutch (LC) and a high-speed hydraulic clutch (HC), which also serve as the clutch body (23), are attached to the output shaft (22) to the rotary tillage device (3). At the same time, a low speed side input gear (24) transmission connected to the low speed side hydraulic clutch (LC) and a high speed side input gear (25) transmission connected to the high speed side hydraulic clutch (IIC) are connected to the output shaft (2).
2) is loosely fitted. For such a hydraulic clutch, power from the driving part is transferred to the low speed side hydraulic clutch (LC).
The output gear (26) to be transmitted to the low speed input gear (24)
A relay transmission mechanism (27) is provided that meshes with the low-speed input gear (25) and outputs the power transmitted to the low-speed input gear (25) to the output shaft (22) via the high-speed hydraulic clutch (HC). Therefore, when the low-speed side hydraulic clutch (LC) is operated greatly, low-speed power is directly transmitted from the low-speed side input gear (24) to the output shaft (22), and the high-speed side hydraulic clutch (I
When the IC) is activated, the power transmitted to the low-speed input gear (25) is transferred to the relay transmission mechanism (27) and the high-speed input gear (25).
25) to the output shaft (22). and,
A switching valve (28) is provided to control pressure oil to the high-speed side hydraulic clutch (IC) and the low-speed side hydraulic clutch (LC).

The control configuration described above performs the following work rotation speed control.

(1) When the rotary tiller (3) is in a floating state above the ground, set it to a low working rotation speed.

Whether or not the rotary tiller (3) is floating above the ground can be determined by the signal from the potentiometer (8) since the rear cover (3a) is in a hanging state.

(2) Next, when plowing is performed by descending from this floating state, the timer (29) is activated at the same time as the rear cover (3a) touches the ground, and when a predetermined time has elapsed, the high-speed side hydraulic pressure is activated. Activate the clutch (IIG) and switch to a high working rotation speed. Therefore, the increase in tillage level and engine stalling at the initial stage of tillage are eliminated.

(3) When turning at the edge of a ridge or stopping tillage work, the rotation speed is set to high speed based on the command to start raising from the lift operation lever (13) or the command to start raising from the rise switch (19). Switch from the state to the low speed work rotation speed state. Therefore, the plowing edge will not be greatly depressed.

The above control is also controlled by the control device (10), which is referred to as a control means.

[Another example]

The adjustment mechanism (21) may have a structure that does not switch between two stages, but one that switches without permission. Furthermore, a clutch other than a hydraulic type may be used as the clutch for switching.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the working rotation speed switching device for a rotary tilling device according to the present invention, in which FIG. 1 is a diagram of the overall control, FIG. 2 is a side view showing the tilling state at the start of tilling, and FIG. 3 is a turning diagram. FIG. 4 is a side view showing the rotary tilling device attached to the agricultural tractor. (3)...Rotary tillage device, (10)...
...control means, (21) ...adjustment mechanism.

Claims (1)

[Claims] The rotary tiller (3) is configured to be able to move up and down relative to the aircraft, and is also provided with an adjustment mechanism (21) that varies the working rotation speed of the rotary tiller (3), so that the rotary tiller (3) can be lowered and The rotary tilling device (3) is configured to set a low working rotational speed for a predetermined period of time and return to a high working rotational speed after a predetermined period of time has elapsed.
A working rotational speed switching device for a rotary tiller, comprising a control means (10) for operating the adjustment mechanism (21) to switch from a high working rotational speed to a low working rotational speed based on a rising start command for a rotary tiller.