JPH032Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Field of industrial application The present invention relates to a depth control device for constantly maintaining a constant plowing depth of a working machine such as a rotary tiller mounted on an agricultural tractor.

In particular, the depth control device is equipped with an electric feedback system to improve the sensitivity of the plowing depth detector.
This ensures signal feedback.

(b) Prior art There have been depth control devices that used an electric feedback system in the past, but since the tilling depth was set using a knob-type volume switch, etc., the mechanical There was a large gap in the feel of the depth control lever, which caused confusion for new operators.

(c) Purpose of the invention In order to avoid changing the operating feel of the conventional mechanical depth control device as much as possible, the present invention leaves the conventional depth control lever as it is and extends it to form an arm, which is connected via a link. It is configured to operate a plowing depth setting device such as a rotary encoder.

(d) Structure of the invention The purpose of the invention is as described above, and the detailed structure of the invention will be explained based on the configuration of the embodiment shown in the attached drawings.

Figure 1 is an overall side view of an agricultural tractor equipped with a rotary tiller. Figure 2 is a block diagram of the depth control device of the present invention. FIG. 3 is a sectional view of the hydraulic case showing the feedback structure of the depth control. FIG. 4 is a sectional view of the control lever portion. FIG. 5 is a rear view of the agricultural tractor.

Referring to FIG. 1, an outline of an agricultural tractor and a rotary tiller equipped with a depth control device will be explained.

A hydraulic case 14 is mounted and fixed on the upper surface of a transmission case 13 of an agricultural tractor. A seat 52 is provided at the top of the hydraulic case 14.
Further, a control lever guide 22 is fixed to the side surface of the hydraulic case 14, and the depth control lever 1 is attached to this control lever guide 22.
The position control lever 2 is rotatably guided. 23 is Fender.
The rotation angle detector 3 attached to the outer end of the rotation shaft 45 of the lift arm 7 is connected to the rotation shaft 45 of the lift arm 7.
and the fender 23 by a beam bridge and fixed on both sides.

In addition, the hydraulic case 14 and the transmission case 13
A fat setter 26 is supported at a lateral position. The depth control lever 1 and the depth setting device are connected by a link.

The rotary tiller is composed of a tiller claw 18, a tiller cover 21, a side cover 20, a rear cover 9, a fat frame 12, and a hanger rod 11, and is pivotally attached to the rear surface of the mission case 13 with two-point attachment hits 53, 53. ing. The lift rod 1 interposed between the lift arm 7
It moves up and down at 0.

The depth control device of the present invention detects the tilling depth of the tilling claws 18 through the rear cover 9, and transmits the information to the tilling depth detector 8 through the links 16 and arms 15 and 17.
The signal from the plowing depth sensor is transmitted to the controller 27, where it is fed back and moved up and down by the lift arm 7. Based on this detection, a feedback control circuit controls the tilling claws 18 so that they always maintain a constant tilling depth.

Next, an overview of the control will be explained with reference to FIGS. 2, 3, and 4.

The depth control device of this embodiment performs plowing depth detection and feedback electrically, but
Hydraulic valve 2 for raising and lowering the rotary tiller
9 is configured to be operated mechanically.

The control motor 5 performs the role of converting the electrical feedback and mechanical action.

The control motor 5 connects the link 30,
The depth control bar 28 is moved to slide the spool 29a of the hydraulic valve 29, and the rotation of the control motor is controlled by the spool 29a.
A spool position detection switch 6 is provided to accurately stop the motor at the raised, neutral, and lowered positions of a, and the control motor is configured to stop as specified at the position of this spool position detection switch. The control motor 5 rotates in the upward or downward direction in accordance with the feedback value from the tillage depth detector 8, and when the tillage depth set by the tillage depth setting device 26 is reached, the control motor 5 is moved to the center position. I'll bring it back.

The depth control lever 1 sets the plowing depth setting device 26, and the depth control lever 1 is pivotally supported by a pivot shaft 24 of a control lever guide 22, and has an arm 1a projecting below it. A plowing depth setting device 26 is connected to this arm 1a via a link 25, and the plowing depth setting device 26, which is composed of a rotary encoder or the like, electrically sets a constant value. , 2 position control levers mechanically set the position of the position control that constitutes automatic control.

Then, when the agricultural tractor reaches the edge of the field using the highest rotation position switch 2a, it senses that the position control lever 2 has been fully rotated to raise the rotary tiller to the highest position, and electrically adjusts the depth. Temporarily stop the control. When the position control lever is rotated from the highest position to a direction other than the highest position after going around the edge of the field, depth control starts again.

Further, a reverse movement detection switch is provided on the conversion lever 68, and when the gear is changed to reverse movement, the rotary tilling device is configured to rotate upward in order to prevent destruction due to the backward movement of the aircraft.

31 is a depth control on/off switch.

A rotation angle detector 3 of the lift arm 7 is provided at the rotation shaft 45 of the lift arm 7. The rotation angle detector 3 detects the rotation angle of the lift arm, and when the rotation angle exceeds a certain level, the rotation angle detector 3 detects the rotation angle of the lift arm. You can stop depth control and switch to position control,
Position control can be controlled electrically. When position control is performed electrically, the control motor is operated not by the feedback value from the plowing depth setting device 8, but by the feedback value from the rotation angle detector 3 of the lift arm. Electrical position control is performed by switching.

In this case, the rotation angle of the lift arm of the position control will be set using the plowing depth setting device 26, so the depth control lever that was previously used will be replaced by an electric position control lever, and The position control lever becomes a mechanical position control lever.

The states of mechanical position control and electrical depth control will be explained with reference to FIGS. 3 and 4.

First, in mechanical position control, the rotation angle of the lift arm is set using the position control lever 2. The rotation of the position control lever 2 causes the shaft 48 to rotate, and the arm 50 and link 43 are rotated. Through this, the position control lever 40 shown in FIG. 3 is moved back and forth, pushing and pulling the spool 29a, raising or lowering the hydraulic valve 29 to set the rotation angle of the lift arm.

On the other hand, when the lift arm 7, rotation shaft 45, and connecting rod arm 46 rotate, the position control lever 4 is moved by the arm 35, link 36, arm 37, shaft 38, arm 39, and link 41.
The opposite end of 0 rotates and pushes and pulls the spool 29a until it returns to neutral.

Next, the plowing depth of the electric depth control is set using the plowing depth setting device 26 as described above. and,
For feedback, a signal is transmitted from the plowing depth detector 8 to the control motor 5 via the controller 27, and as the control motor 5 rotates, the depth control bar 28 moves back and forth via the outer shaft 33, arm 34, and link 30. Lower or raise the spool 29a. In response to a signal from the plowing depth detector 8 indicating that the set plowing depth has been reached, the control motor rotates in the reverse direction, returns to neutral, and stops there.

In case the electric circuit breaks down and stops working, move the depth control lever backwards.
A mechanical arm 47 shown in Fig. 4 is provided so that work can be performed using only position control, and the depth control lever is normally stopped at a near-neutral position with a bolt, but the fixing bolt 42
When the depth control bar 28 pushes the spool 29a, an electrical failure occurs at the position where the spool 29a is pushed, and if position control cannot be performed, the depth control bar 28 is moved back and only position control is activated. It is possible. In this case, the arm 51 and the link 44 are used to push and pull the depth control bar 28 from the outer shaft 49.

In such an overall configuration, FIG.
The mounting position is shown. Since it is desirable for the operator to be able to operate the electric depth control in the same way as with the conventional mechanical depth control device, the depth control lever is placed in exactly the same position as the conventional depth control lever. However, what the depth control lever actually operates is an electric plowing depth setting device 26 such as a rotary encoder, so there is no place to attach it to the control lever guide section. Therefore, after being pivotally supported by the shaft 48, it protrudes downward as an arm 1a, and a link 25 is interposed in this arm, protruding forward, and is fixed to the side of the hydraulic case 14 or the transmission case 13 with a mounting body 58 for cultivation. It is configured to operate the depth setting device 26. This configuration allows the operator to operate with exactly the same feeling as in the case of conventional mechanical depth control devices.

FIG. 6 is a side view showing details of the plowing depth setting device 26 and the depth control lever portion, and FIG. 7 is a partially sectional view of the rear side. 22a is a lever stopper provided at the base of the control lever 22. In the case of this embodiment, the mounting body 58 protrudes from the hydraulic case 14, and a bowl-shaped mounting case 58a is attached to the mounting body 58.
is fixedly installed, and a plowing depth setting device 26 composed of a rotary encoder or the like is disposed inside this. The arm 26a on the tillage depth setting device 26 side and the arm 1a of the depth control lever 1 are connected by a link 25.

(e) Effect of the invention As described above, the invention pivots the depth control lever 1 on the axis of the position control lever, extends the arm 1a downward from the pivot point, and connects the arm 1a to the hydraulic case. Or tillage depth setting device 2 fixed on the side of the transmission case.
6 is configured to rotate, the depth control lever can be placed in the same position as in the case of a conventional mechanical depth control device, and
The shape of the arm and link can be set so that depth control is performed at the same rotation angle as a conventional depth control, giving the operator the feeling of operating the depth control device electrically. Instead, you can operate the more sensitive depth control device with the same feeling of conventional operation.

In addition, the parts of the conventional mechanical depth control device are left as they are, the arm 1a is protruded, a link 25 is provided, and a plowing depth setting device is added, thereby increasing the number of dual-purpose parts, and replacing the mechanical depth control device with an electric one. It can be converted into a type depth control device.

Furthermore, by using an electronic plowing depth setting device such as a rotary encoder, it is possible to improve accuracy and sensor sensitivity compared to a mechanical method. Also, if the rotary encoder is configured to rotate directly on the rotation axis of the depth control lever, the rotation angle for adjusting the depth control lever is determined by the rotation angle of the rotary encoder, and a large rotation angle is required. However, when the arm 1a, the link 25, and the arm 26a are interposed between them as in the present invention, by changing the length of the arm 2a and the arm 26a, the rotation angle of the depth control lever 1 can be changed from that of the conventional mechanical type. The rotation angle of the depth control lever 1 can be made the same as that of the case.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of an agricultural tractor equipped with a rotary tillage device, Fig. 2 is a block diagram of the depth control device of the present invention, and Fig. 3 is a sectional view of a hydraulic case showing the structure of the depth control device. Figure 4 is a sectional view of the control lever part, Figure 5 is a rear view of the agricultural tractor,
FIG. 6 and FIG. 7 are an enlarged side view and a partial cross-sectional view of the rear side of the attachment part of the plowing depth setting device. 1...Depth control lever, 1a...Arm, 2...Position control lever, 2
6... Cultivation depth setting device, 48... Position control lever shaft.

Claims (1)

[Scope of utility model registration request] The depth control lever 1 is pivoted on the axis of the position control lever 2, and the arm 1a extends downward from the pivot point, and the depth control lever is fixed to the side of the hydraulic case or the transmission case by the arm and the link. A depth control device for an agricultural tractor, characterized in that a setting device 26 is configured to rotate.