JPH0534802U - Automatic control device for tractor working depth - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the number of parts by eliminating the special manual operation tool for the rear cover, and simplify the operation to improve operability. [Structure] The working depth setting volume 20 for automatic working depth control is also used as a rear cover manual operation tool.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic digging depth control system for a tractor having a rear cover moving mechanism.

[0002]

[Problems to be Solved by Prior Art and Invention]

 In general, some tractors of this type perform so-called automatic plowing depth control to raise and lower the tilling working unit based on the rocking angle of the rear cover so as to maintain the plowing depth set by the plowing depth setting device. In order to improve the work accuracy by matching the grounding posture (target swing angle) of the rear cover at the time of shallow plowing and deep plowing as much as possible, the rear cover fulcrum is set backward when the set plowing depth is the shallow plowing value. It is known that the rear cover fulcrum is moved forward and upward when the set plowing depth is a deep plowing value, while it is moved downward. By the way, the rear cover needs to be moved even when not under the automatic control of the working depth, for example, when the ridge raising machine is mounted. Therefore, conventionally, a rear cover manual switch is provided separately, and the manual switch of the rear cover is provided. The rear cover was moved based on the operation. However, in this case, since the number of operating tools is large and the number of parts is not allowed to increase, a single rear cover is moved based on a plurality of operating tools, which complicates the operation and increases operability. Was a problem.

[0003]

[Means for Solving the Problems]

 The present invention was devised with the object of providing an automatic control device for the working depth of a tractor capable of eliminating these drawbacks in view of the above-mentioned circumstances. A tractor equipped with an automatic plowing depth control unit that automatically controls the tilling work unit to move up and down based on the swing angle of the rear cover so that the rear cover is automatically moved based on the set plowing depth. In the operation area of the plowing depth setting device, an automatic plunging depth control release position for stopping movement of the rear cover is provided to enable manual movement operation of the rear cover by the plowing depth setting device. With this configuration, the present invention reduces the number of parts and simplifies the operation of the rear cover to improve the operability.

[0004]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, and a rotary cultivating working unit 3 is movably connected to a rear portion of the traveling machine body 1 via an elevating link mechanism 2. The basic configuration of lifting and lowering 3 by vertically swinging the lift arm 5 accompanying the expansion and contraction of the hydraulic cylinder 4 is the same as the conventional one.

Reference numeral 6 denotes a main cover of the working unit 3, which is formed in an arc shape so as to cover a tilling claw 8 attached to the tilling claw shaft 7, and has an upper surface in the front-back direction. A pair of left and right roller brackets 10 in which a plurality of guide rollers 9 are arranged side by side are fixed.

On the other hand, reference numeral 11 denotes a rear cover provided at a rear end portion of the working unit 3. The rear cover 11 is attached to the support shaft 12 so as to be vertically swingable, and is always downward by a bullet 11a. It is pressed and urged, and is further linked to a tilling depth detection sensor (potentiometer that detects the tilling depth based on the rocking angle of the rear cover 11) 13. The spindle 12 has a peripheral surface of the main cover 6. A pair of left and right guide rails 14 which are curved in a circular arc shape and have a substantially U-shaped cross section are fixedly installed, and these guide rails 14 are fitted onto the guide rollers 9 of the roller bracket 10, respectively. ing. In other words, the rear cover 11 is movable along an arc about the plowing pawl shaft 7 as a center, but it is always located on the lower rear side when shallow plowing, and on the upper front side when deep plowing, so that proper grounding is always maintained. The posture is being maintained.

Further, 14 is an electric cylinder attached to the top mast 15 of the working unit 3, the electric cylinder 14 having a torque limiter, and a rear cover 11 (support shaft 12) having a tip end pivotally connected thereto, which will be described later. It is adapted to be moved by expansion / contraction operation based on an operation command from the control unit 16 to be operated.

Reference numeral 17 denotes a side panel disposed on the side of the driver's seat, and an exposed portion of the side panel 17 has a lifting operation lever 18, a lifting operation switch 19 and a plowing depth which are frequently operated. While the setting volume 20 is provided, the cover portion covered with the transparent cover 21 is provided with another operation tool 22 which is operated less frequently.

The control unit 16 is a control unit configured by using a so-called micro computer (CPU, ROM, RAM) or the like. The control unit 16 includes the working depth detection sensor 13, the lifting operation switch 19, and the plowing operation switch 19. In addition to the depth setting volume 20, a cylinder length sensor 23 that detects the extension / contraction length of the electric cylinder 14, a lever angle sensor 24 that detects the longitudinal swing angle of the lift operation lever 18, and an arm that detects the swing angle of the lift arm 5. Signals are input from the angle sensor 25 and the like, and an operation command is output to the hydraulic cylinder 4, the electric cylinder 14 and the like based on the determination based on these input signals. That is, in the control unit 16, the position control of automatically raising and lowering the working unit 3 based on the detection of the arm angle sensor 25 so as to maintain the set height of the raising and lowering operation lever 18, and the working depth setting volume 20 are performed. The working unit 3 is automatically moved up and down based on the detection of the working depth detection sensor 13 to maintain the working depth set, and the rear cover posture suitable for the working depth set by the working depth setting volume 20 is maintained by the cylinder length sensor 23. It is configured to perform automatic working depth control for moving and controlling the rear cover 11 based on the detection.

Now, FIG. 5 shows a main routine of the control unit 16, which performs switching between the automatic plowing depth control, which is a subroutine, and the position control. The automatic plowing depth control including is executed based on the fact that the plowing depth setting volume 20 is located in the normal setting area, while the plowing depth setting volume 20 is located in the OFF area preset at the deep plowing side setting end. Based on the above, it is released, and in this state, switching to the position control is performed. That is, the working depth setting volume 20 is also used as an ON-OFF switching operation tool for automatic working depth control, but when the working depth setting volume 20 is operated in the OFF range, the rear cover 11 is also moved at the current position. It is supposed to be stopped immediately.

In the embodiment of the present invention constructed as described above, the automatic plowing depth control including the rear cover movement control is canceled by operating the plowing depth setting volume 20 in the OFF region. Since the movement of the rear cover 11 is stopped at the same time, the working depth setting volume 20 can also be used as a manual operation tool for the rear cover 11. Immediately, if you want to stop the rear cover 11 at an arbitrary position, first operate the setting volume 20 to the normal setting area to move the rear cover 11 toward the corresponding position side of the set working depth, and then, the rear cover. If the working depth setting volume 20 is operated to the OFF area when 11 reaches the desired position, the rear cover 11 can be stopped at the desired position. Therefore, the dual use of the working depth setting volume 20 eliminates the need for a dedicated rear cover manual operation switch, and as a result, the number of parts can be reduced.

Moreover, since the rear cover 11 is moved based on a single plowing depth setting volume 20 without moving based on a plurality of operating tools as in the conventional case, the operation can be simplified. As a result, the operability of the rear cover moving operation can be significantly improved.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the OFF region of the automatic plowing depth control is not limited to the deep plowing side setting end position, but the plowing depth setting It goes without saying that it may be set at any position as long as it is within the operation range of the volume. In addition, the OFF area is divided and the rear cover is set to stop immediately in one OFF area, while the rear cover is moved to the deep plowing side limit position in the other OFF area without stopping immediately. It may be set to stop. That is, since the rear cover is often manually operated when the ridge riser, cultivator, etc. are installed, the rear cover is automatically moved to the optimum deep side limit position when the ridge riser, cultivator, etc. are installed. The operability can be further improved by separately setting the OFF range that can be set. Further, the conventional rear cover manual operation switch may be provided as it is, and the rear cover movement operation by the operation switch may be differentiated from the rear cover movement operation by the plowing depth setting volume. In other words, if the rear cover automatic control is canceled when the rear cover is moved by the rear cover manual operation switch, the rear cover can be stopped at any position during the automatic plowing depth control. It is possible to deal with various tasks.

[0014]

[Operation effect]

 In summary, since the present invention is configured as described above, the rear cover can be moved and controlled based on the set plowing depth during the automatic plowing depth control. Since the automatic depth of control control release position is set so that the movement can be stopped, the rear cover can be manually moved using the depth of field setting device. In other words, if you want to stop the rear cover at any position, operate the plowing depth adjuster in the normal setting range to move the rear cover toward the corresponding position of the set plowing depth, and then place the rear cover at the desired position. If the tiller depth setting device is operated to the tiller depth automatic release position at the stage when it reaches the maximum, the rear cover will stop at the desired position. Therefore, the tiller depth setting device can be used also as the rear cover manual operation tool without providing a special dedicated rear cover manual operation tool as in the past, and as a result, it is not possible to reduce the number of parts. By reducing the number of operating points, the operation can be simplified and the operability can be significantly improved.

[Brief description of drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of a side panel.

FIG. 4 is a block diagram showing an outline of a control mechanism.

FIG. 5 is a flowchart for closing the control procedure in the control unit.

[Explanation of symbols]

 1 Traveling Aircraft 3 Working Section 11 Rear Cover 14 Electric Cylinder 16 Control Section 20 Tillage Depth Setting Volume

Claims (1)

[Scope of utility model registration request] 1. A tilling working unit is automatically moved up and down based on a swing angle of a rear cover so as to maintain a set working depth of a working depth setting device, and a rear cover is automatically moved based on the set working depth. In a tractor provided with an automatic tilling depth control unit for controlling, in the operation area of the tilling depth setting device, a tilling depth automatic control release position at which rear cover movement is stopped is provided to allow manual movement operation of the rear cover by the tilling depth setting device. Automatic control device for tractor tilling depth, which is made possible.