JP2935618B2 - Vehicle speed control device during rotary work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed control device when a cultivator performs a rotary operation.
The present invention relates to a vehicle speed control device in which a set till depth can be obtained immediately after a rotary once rises to a predetermined height and then lowered to start a rotary work.

[0002]

2. Description of the Related Art When a rotary cultivator performs rotary work,
When the end of the field is reached and one stroke is completed, a so-called revolving operation is performed in which the position is shifted by the width of the rotary provided with the rotating claw and turned back, so that the rotary work is continued for each rotary width, and the entire field is plowed. Is conventionally performed.
In the operation procedure at the time of the traveling, the rotary is temporarily raised, the direction of the riding traveling body is changed, and the operation is performed so that the rotary is lowered and the work is resumed at the same time when the straight traveling is started. Fig. 7-
Explained by 13.

As shown in FIG. 6, a riding cultivator C generally includes a three-point link mechanism 3 including a top link 3b and left and right lower links 3c, 3c rotatably provided at a rear portion of the riding body 1. And a lift arm 3a, 3a pivotally supported above and below a rear portion of the riding body 1 so as to be vertically movable.
The tilling unit 2 is supported by the other ends of the left and right lower links 3c, 3c and the lift rod 3d connected to the rear of the left and right lower links 3c, 3c. The tilling unit 2 is moved up and down by the lift arms 3a, 3a. It is configured to adjust the plowing depth by raising and lowering. In addition, reference numeral 1a shown in each figure is a rear wheel of the riding body 1, 2a is a rotary made of a rotating claw (not shown), 2b is a rotary cover, 2c is a rear cover also serving as a tillage depth sensor, and G is a field cover. The surface, H, is the set tillage depth.

When the riding cultivator C reaches the end of the rotary working area, an operator (not shown) operates a hydraulic lever (not shown) in an upward direction, and as shown in FIG. The passenger traveling body 1 is turned around while the tilling unit 2 is raised (thick arrow in the figure) by operating the 3a, and the rotary work is resumed by lowering the rotary 2a while traveling in the opposite direction as shown in FIG. . Thus, the rotary 2a may initiate rotary working reaches the landing position P ₁ until (Figure 8) Set tilling from deep H is obtained, riding tiller C travels a certain distance S ₁ (FIG. 9 ).

[0005] Therefore, looking at the cross section of the cultivated portion of the field, at the end of the first stroke (Fig. 10A), although the groove D in which the rotary 2a has scooped the soil behind is dug, the set cultivation depth H
Is obtained, but when the work is resumed after recirculation (Fig. 10
As for the cultivation depth of B), there is a portion that gradually becomes deeper. Therefore, when the lands of the rotary 2a in landing position P ₁ obtained by matching the position L was increased rotary 2a and end of stroke, FIG.
As shown in 10C, riding tiller C until obtaining a set tilling depth H is advanced by a distance S _1, during which becomes shallower than Kofuka set tilling depth H.

[0006]

By the way, in general, when performing a rotary work, the tilling work is performed while leaving a headland (about twice as large as a normal tilling width) while leaving a headland for the machine body to move at the edge of the field. Start and perform one-side cultivation (field tilling, shifting the position and turning it back), and cultivating the headland and uncultivated land twice by round cultivation when the uncultivated land is almost the same as the headland width Has been taken. Further, when the rotary is started at the time of work or after revolving, if the rotary is rapidly lowered, the rotary (claw) bites into the field scene, and the reaction force causes a dashing phenomenon in which the machine body jumps forward, or an excessive load is applied to the rotary. There is a problem that causes a stall. Therefore, conventionally, in order to solve this problem, the aforementioned problem was solved by slowing down the rotary before the rotary (claw) entered the field scene. However, for this reason, immediately after the work started or immediately after the work circulation. Therefore, it is necessary to re-till this part without setting the tillage depth, and there is a problem that work efficiency is reduced.

The present invention has been made in view of the above problems, and when the rotary work is started by lowering the rotary from an up state, for example, when the rotary work is resumed after circulating, the rotary is set to a set depth. It is an object of the present invention to provide a vehicle speed control device at the time of a rotary work, which can reach the vehicle quickly.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, a vehicle speed control device for rotary work according to the present invention is provided with a shift lever for switching between road running and rotary work running on a riding cultivator, and a lift arm. A hydraulic lever for operation, a rotary work speed, a transmission for switching to a speed lower than the rotary work speed, and a vehicle speed control unit,
When the shift lever is switched to rotary work traveling and the hydraulic lever is switched from the highest position to the lowest position of the rotary, the rotary work vehicle speed control unit reduces the vehicle speed in conjunction with the switching of the hydraulic lever. A control signal to return the vehicle speed to a normal rotary work vehicle speed after the riding cultivator has traveled a predetermined distance or time, or reaches a predetermined cultivation depth, so as to output the control signal to the transmission. It was done.

The means for returning the vehicle speed to the normal rotary work vehicle speed after traveling the predetermined distance is not particularly limited. For example, instead of directly measuring the distance, an arm angle sensor is attached to the rotary lift arm, and the angle signal output by the arm angle sensor during the control operation of reducing the vehicle speed by the rotary work vehicle speed control device is performed. It is also possible to use a means for indirectly measuring the distance, such as a means for returning the vehicle speed to the normal rotary work vehicle speed when the set angle is reached.

[0010]

When the rotary is lowered from a raised state during the rotary work of the riding cultivator, the normal rotary working vehicle speed is switched to low speed running, and after traveling a predetermined distance, the means for returning to the normal rotary working vehicle speed is excessively large. It works so that the set tillage depth can be obtained as short as possible after the rotary lands, without imposing a heavy load.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. As shown in FIGS. 1 to 3, the vehicle speed control unit 4 during the rotary work used in the present embodiment includes a microcomputer 4a, a hydraulic lever 3A for operating a lift arm for setting control conditions for the microcomputer 4a, a shift lever 5a, A timer setting device 5b comprising a variable resistor is provided, and the microcomputer 4a controls the hydraulic valve 5d.

The speed change lever 5a switches the vehicle speed of the riding traveling body 1 between a road traveling vehicle speed and a rotary work vehicle speed. That is, when the shift lever 5a is operated to the road running side and when it is operated to the rotary work side,
They are configured to obtain different vehicle speeds.
The hydraulic cylinder 5c switches the control valve 3e by the hydraulic lever 3A to raise and lower the rotary 2a as understood from FIG. The microcomputer 4a can be programmed to perform control for purposes other than the present invention.

The microcomputer 4a is programmed in advance with a timer function. When the hydraulic lever 3A is operated to raise the rotary 2a and then is switched to lowering, the microcomputer 4a receives the signal, and the microcomputer 4a Control 5d and activate timer. That is, the control signals output by the microcomputer 4a are a control signal given to the hydraulic valve 5d for changing the vehicle speed, and a control signal for activating the timer.

When the timer starts operating, the microcomputer 4a
Counts the elapsed time, compares the elapsed time signal with the set time signal from the timer setting unit 5b, and when the elapsed time signal reaches the set time signal, the microcomputer 4a sets the vehicle speed to the normal rotary work vehicle speed. A control signal for switching is given to the hydraulic valve 5d. The hydraulic valve 5d controls hydraulic oil supplied from the hydraulic pump 5a to selectively engage and disengage hydraulic clutches 6a and 6b (FIG. 2) provided in the transmission 6. The transmission 6 is disposed between the main clutch 1c attached to the output shaft 1b of the engine E and the main transmission 1d. Then, when the hydraulic clutch 6a is engaged and the main transmission 6 is switched to the rotary work vehicle speed stage, the rotary work vehicle speed is obtained. 2, reference numeral 1e denotes a propulsion shaft, reference numeral 2d denotes a rotary drive shaft, reference numeral 2e denotes a rotary clutch, reference numeral 5a denotes a hydraulic pump for the hydraulic clutches 6a and 6b, and reference numeral 5b denotes a tilling unit 2. Is a hydraulic pump that moves up and down. The hydraulic cylinder 5c and the hydraulic valve 5 shown in FIG.
d and the like are for conceptually explaining the control system and do not show details of the operation.

Next, the operation of the microcomputer 4a will be described with reference to the flowchart shown in FIG. That is, in step S1, it is determined whether or not the shift lever 5a is operated to the rotary operation side, and if a negative result is obtained, the process proceeds to step S1.
Is executed, and if a positive result is obtained, the process proceeds to step S2, where it is determined whether or not the rotary 2a is raised, that is, whether or not the hydraulic lever 3A is operated on the upward side, and if a positive result is obtained. Step S1 is executed again, and if a negative result is obtained, the process proceeds to step S3.

In step 3, it is determined whether or not the hydraulic lever 3A is being operated to descend. If a negative result is obtained, step 1 is executed, and if a positive result is obtained, the process proceeds to step 4. In step 4, the microcomputer 4a outputs a control signal for switching the vehicle speed from the rotary work vehicle speed to a low speed to the hydraulic valve 5d and activates a timer programmed in the microcomputer 4a. When the hydraulic valve 5d operates, the hydraulic clutch 6a is disengaged, the hydraulic clutch 6b is engaged, and the riding cultivator C is decelerated.

Next, at step 5, the microcomputer 4a
The timer counts the elapsed time, compares it with the set value of the timer setter 5b, and when the count value reaches the set value, proceeds to step 6, where the microcomputer 4a sets the hydraulic valve 5
d, a control signal is output, the hydraulic clutch 6a is engaged, the hydraulic clutch 6b is disengaged, and the riding cultivator C is returned to the normal rotary work vehicle speed, and step S1 is executed again.

As described above, in the rotary work process,
When an operation such as the turning and the start of the rotary work is performed, the microcomputer 4a detects that the hydraulic lever 3A has been operated from the ascending to the descending side in Step 3, and can control the vehicle speed to be slow. . With reference to FIGS. 5A to 5C, the operation and effect when the rotary work is performed as described above will be described. The plowing depth after raising the rotary according to the present embodiment (FIG. 5A) is the same as in the conventional case shown in FIG. 10, but the rotary plowing when the rotary work is resumed is set by the rotary. distance S ₂ to reach the tilling depth H is the vehicle speed is slow, even takes time to rotary 2a bite into the ground to some extent, can be rotary 2a to shorten the advance distance S _2, raises the rotary a position L was, after Kaigyo, and a position P ₂ the rotary reaches a set tilling depth H, can be aligned as shown in FIG. 5C,
Work efficiency can be improved.

Recently, a quick return method has been adopted in which the engine is turned without turning down the throttle of the engine at the time of turning. In this case, the device of the present invention can be applied very effectively.

[0020]

As described above, the vehicle speed control apparatus for rotary work according to the present invention is designed to reduce the vehicle speed at the part where the rotary is lowered from the raised state when performing the rotary work. Without applying an excessive load to the rotary work, the moving distance until reaching the set till depth can be shortened, and it is almost unnecessary to re-tilt the part that does not reach the set till depth by turning and tilling. In addition, the rotary work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a vehicle speed control device during a rotary operation according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a configuration of a transmission used in the embodiment shown in FIG.

FIG. 3 is a schematic explanatory view showing a state in which the vehicle speed control device at the time of the rotary work shown in FIG. 1 is incorporated into a riding cultivator.

FIG. 4 is a flowchart for explaining an outline of a control operation of the vehicle speed control device at the time of the rotary work shown in FIG. 1;

5A is a cross-sectional view of a field for explaining a soil state in a portion where one step of the rotary work performed by the vehicle speed control device at the time of the rotary work shown in FIG. 1 is completed, and FIG. 5B is FIG. 5C is a cross-sectional view of the field for explaining the state of the soil at the portion where the rotary work of the next step has been started, and FIG. 5C is an outline of the part where the set plow depth is obtained for each step of the rotary work. It is the top view shown.

FIG. 6 is an explanatory view of a tilling state when one step of a rotary operation of a conventional riding cultivator is completed.

FIG. 7 is an explanatory diagram of a state in which the ascent of the rotary has started following the state of FIG. 6;

FIG. 8 is an explanatory view of a state in which the rotary machine is turned from the state of FIG. 7 and the rotary starts plowing the soil.

FIG. 9 is an explanatory diagram of a tilling state of soil from the state of FIG. 8 until a set tilling depth is obtained.

FIG. 10A is a cross-sectional view of a field for explaining a state of soil in a portion where one stroke of the conventional rotary work has been completed,
FIG. 10B is a cross-sectional view of a field for explaining the state of the soil at a portion where the rotary work has been started from FIG. 10A and the rotary work in the next stroke has started, and FIG. It is the top view which showed the part which showed by outline.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Riding body 1a Rear wheel 1d Main transmission 2 Tilling part 2a Rotary 3a Lift arm 3A Hydraulic lever 5c Hydraulic cylinder 4 Rotary work vehicle speed control part 5a Shift lever 5b Timer setting device 6 Transmission 6a Hydraulic clutch 6b Hydraulic clutch C Riding tillage Machine H Setting till depth

Claims (1)

(57) [Claims] 1. A speed change lever for switching between road running and rotary work running for a riding cultivator, a hydraulic lever for operating a lift arm, a rotary work speed, a transmission for switching to a speed lower than the rotary work speed, and a vehicle speed. A control unit, wherein the speed change lever is switched to rotary work traveling, and when the hydraulic lever is switched from the highest position to the lowest position of the rotary, the rotary work vehicle speed control unit switches the hydraulic lever. A control signal for reducing the vehicle speed in conjunction therewith is output to the transmission, and after the riding cultivator has traveled a predetermined distance or time, or when a predetermined cultivation depth has been reached, a control signal for returning the vehicle speed to a normal rotary work vehicle speed is transmitted to the transmission. Vehicle speed control device for rotary work that outputs to the machine.