JPH09205822A - Ground work device rolling and lifting operation structure for agricultural work machines - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To use a right lowering button and a left lowering button which are used when changing a rolling reference posture of a rotary tiller as a button for manually elevating and lowering the button unexpectedly. Also, make sure that the rotary tiller does not rise or fall unexpectedly. A key switch for starting an agricultural tractor
2 and horizontal button 20A for changing the rolling reference posture
By simultaneously operating and, the control mode can be changed from the rolling control mode to the manual elevating mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a ground work device which can be raised and lowered and can be freely rolled with respect to a traveling machine body, and in a rolling control mode for maintaining the rolling posture of the ground work device at a target posture, Control means for providing an adjustment operation tool for changing and setting the target posture and a mode selection operation tool for selecting a control mode, and drivingly controlling the ground work device in response to an operation command from the adjustment operation tool and the mode selection operation tool. The present invention relates to a ground work device rolling / up / down operation structure of an agricultural work machine provided with.

[0002]

2. Description of the Related Art Even in an agricultural work machine equipped with a device for automatically rolling a ground work device, a device for controlling those devices, such as a position setter or an angle sensor, which will be described later, has a malfunction, or In some cases, it may be necessary to manually roll or operate the ground work device for maintenance work. In consideration of such a case, as shown in FIG. 3, the extension solenoid 24A of the lift rod expansion / contraction solenoid valve 24 that controls the rolling operation is performed so that the manual operation is performed without using the control device as the control means. , A rolling changeover switch 25 for selecting the shortening solenoid 24B, and a lift solenoid 26 for lifting lift solenoid valves 26, 26 of the lift arm which controls the lifting operation.
A, a raising / lowering changeover switch 27 for selecting the lowering solenoid 26B is connected in parallel, and both changeover switches 25, 27 are connected.
There is a switch provided with a rolling up / down selection switch 28 for selecting. If the above-mentioned configuration is adopted, each of the above-mentioned switches can be used only in the manual forced operation, so if the switches necessary for automatic rolling control etc. are included, the number of installed switches becomes large, The device configuration becomes complicated. In order to eliminate the complexity of such a device configuration, the operation means as shown in FIG. 4 is configured. That is, in the rolling control mode, the push-button right lowering switch 20B and the left lowering switch 20C are used as adjusting operation tools for setting the target posture of the ground work device.
Is provided, and the tilt angle of the ground work posture, which is the standard target posture for rolling control, is set by the push button switch 20.
There is a configuration in which B and 20C are operated to change to a downward-rightward posture or a downward-leftward posture, and rolling control is performed with the inclination angle of the new changed posture. And, in order to use these two push buttons 20B and 20C also as the buttons for lifting and lowering the ground work device,
A position holding type (toggle type) changeover switch 20A was provided as a mode selection operation tool. With such a configuration, by selectively operating either the changeover switch 20A, the rolling control mode and the manual elevating mode can be selectively selected, and two push button switches can be selectively operated in each mode. In the rolling control mode, it can be forced to move to the right or left, and in the manual lifting mode,
It can be forced up or down.

[0003]

Since the push-button switch can be used in both modes by adopting the above-mentioned structure, the switch can be used in common, but it is necessary to confirm which mode is selected by the change-over switch. Since it is troublesome and easy to neglect it, in such a case, workability is not good because the ground work device may be unexpectedly moved up and down due to rolling operation. Therefore, the connector is used as a switch to switch between the rolling control mode and the manual lifting mode depending on the connection state of the connector with the control means, that is, when the connector is connected and disconnected. Even if it is connected, if there is a disconnection etc., it will be the same mode as when disconnecting, so in this case as well the ground work device may move up and down unexpectedly, and such an unexpected situation is completely avoided. It wasn't done.

An object of the present invention is to provide a device which does not unexpectedly move up and down when the ground work device is forced to perform a rolling operation.

[0005]

[Means for Solving the Problems]

[Structure] A characteristic structure of the present invention according to claim 1 is that when the agricultural working machine is started by an operation on a start operation tool while operating the mode selection operation tool configured as a return type, the operation by the control means is performed. The mode is configured to be set to the manual elevating mode, and the function and effect are as follows.

[Operation] In other words, in order to switch the control means in the rolling control mode to the manual elevating mode, it is necessary to operate two operating tools, a starting operating tool and a mode selecting operating tool. Willingness to switch to manual lift mode is required. Then, when manually moving up and down, it is always operated intentionally, so that it is possible to avoid accidental up / down operation of the ground work device.

[Effect] Therefore, the rolling operation and the manual lifting of the ground work device can be smoothly performed.

[Structure] In the characterizing feature of the present invention according to claim 2, in the characterizing feature of the present invention according to claim 1, when the mode selection operation tool is operated again in the manual elevating mode, the control means operates. The present invention is configured so as to switch the operation mode of (1) to the rolling control mode, and its operation and effect are as follows.

[Operation / Effect] That is, when switching from the manual elevating mode to the rolling control mode, it is only necessary to re-operate the mode selection operation tool. The reason why such a simple operation is required is that, when the rolling operation is unexpectedly performed, the effect on the operator is smaller than when the lifting operation is performed.

[Structure] In the characterizing feature of the present invention according to claim 3, in the characterizing feature of the present invention according to claim 2, when only the activation operation tool is operated, the operation mode in the control means is changed to a rolling control mode. It is configured so that it has the following effects.

[Operation / Effect] In other words, when the agricultural working machine is activated, the rolling control mode is always set, and therefore the ground working apparatus does not unexpectedly move up. Therefore, as described above, it is possible to switch to the manual elevating mode only when the user intentionally operates.

[Structure] The characterizing feature of the present invention according to claim 4 is that in the structure according to claim 1, claim 2, or claim 3, in the manual elevating mode, the notification mechanism is activated. There is a certain point, and the action and effect are as follows.

[Operation / Effect] In other words, an alarm is issued so that the ground work device does not move up and down unexpectedly, and when the ground work device moves up and down, the operator should be sufficiently cautioned. .

[0014]

1 shows a rear portion of an agricultural tractor which is an example of a work vehicle, in which a vertically movable top link 1 and a pair of left and right lower links 2 are interposed in a mission case 3 of a traveling machine body. The rotary tiller 4 (corresponding to the ground work device) is connected. A pair of lift arms 6 swingably driven up and down by a hydraulic cylinder 5 are provided above the mission case 3, and the pair of lift arms 6 and the lower link 2 are provided with a lift rod 7 and a double-acting hydraulic cylinder 8. Are connected via.

As a result, as shown in FIG. 2, the three-position switching type lift control valve 16 for the hydraulic cylinder 5 is operated to lift and lower the entire rotary tiller 4 by the hydraulic cylinder 5 and the lift arm 6. By operating the three-position switching type rolling control valve 17 for the hydraulic cylinder 8,
By rotating the hydraulic cylinder 8, the rotary tiller 4 is rolled around the connection point with the lift rod 7.

This agricultural tractor comprises a rotary tiller 4
The function of automatic tillage depth control that keeps the height of plowing from the ground at the set height, the function of position control that keeps the height of the rotary tiller 4 relative to the machine at the set position, and the function of the rotary tiller 4 It has a rolling control function that keeps the left and right tilt angles at the set angles.

As shown in FIGS. 2 and 1, the rotary tiller 4 is provided with a rear cover 9 which is vertically swingable, and the tilling depth sensor 10 for detecting the vertical swing angle of the rear cover 9 with respect to the rotary tiller 4. Is provided. Therefore, by the automatic plowing depth control, the raising / lowering control valve 16 is operated so that the detection value of the plowing depth sensor 10 becomes the set plowing depth of the plowing depth setting device 11 of the potentiometer type provided on the machine body, and the hydraulic cylinder 5 The lift tiller 6 automatically moves the rotary tiller 4 up and down.

As shown in FIG. 2, an angle sensor 13 for detecting the vertical angle of the lift arm 6 with respect to the machine body is provided at the base of the lift arm 6. As a result, by position control, the lift control valve 16 is operated by the hydraulic cylinder 5 so that the lift arm 6 moves up and down so that the detection value of the angle sensor 13 becomes the target value set by the position setter 12 provided on the machine body. The rocking operation is performed.

Therefore, when the rotary cultivator 4 is located above the ground, the operator operates the position setter 12 to arbitrarily move the position of the rotary cultivator 4 with respect to the machine body by position control. Can be changed to. When the rotary tiller 4 is moved down to a position in contact with the ground by the position setter 12, the automatic tillage depth control is automatically switched to the operating state, and the detection value of the tiller depth sensor 10 is set by the tiller depth setter 11. The rotary tilling device 4 is automatically moved up and down so as to reach the tilling depth.

As shown in FIG. 2, an elevating lever 18 is provided which can raise the rotary tiller 4 to a predetermined height with respect to the machine body at a stretch.
It can be operated in three positions, center and lower, and is biased to the center position. As a result, when the elevating lever 18 is once operated upward, the elevating control valve 16 is operated in preference to the position control and the automatic plowing depth control described above, and the rotary tiller 4 is operated to be swung up to a predetermined height with respect to the machine body. Therefore, once the elevating lever 18 is operated downward, the rotary tiller 4 is lowered to the original position, and the above-mentioned position control or automatic tilling depth control is restored. In this case, a height setting device 19 is provided to adjust the predetermined height at which the rotary tiller 4 is lifted when the lift lever 18 is operated upward. As described above, the detection results from the various sensors are the control device 2 as the control means.
1 controls the operation of the hydraulic cylinder 5 and the lift rod 7.

Next, the structure of the rolling control function will be described. As shown in FIGS. 2 and 1, a stroke sensor 14 that detects the amount of expansion and contraction of the hydraulic cylinder 8 and a weight-type tilt sensor 15 that detects the left and right tilt angles of the machine body with respect to the horizontal plane are provided. Accordingly, the left and right tilt angles of the rotary tiller 4 with respect to the machine can be detected by the amount of expansion and contraction of the hydraulic cylinder 8, and the horizontal tilt angle of the rotary tiller 4 with respect to the machine and the detection values of the tilt sensor 15 enable detection of the horizontal plane. The left and right inclination angles of the rotary tiller 4 can be detected.

There is provided a tilt setting means 20 for setting the left and right set tilt angles of the rotary tiller 4 to be maintained with respect to the horizontal plane. The tilt setting means 20 is provided with three push buttons 20A, 20B and 20C, and is composed of a horizontal button 20A, a right lowering button 20B and a left lowering button 20C. Therefore, in the automatic rolling control mode, if the right lower button 20B and the left lower button 20C are operated separately, the hydraulic cylinder 8 continues the expansion and contraction operation during the operation, and the left and right settings of the rotary tiller 4 are performed. Change the tilt angle (target tilt angle). The tilt angle at the time when the operation is stopped becomes a new target tilt angle, and rolling control is performed. Right Down Button 20B and Left Down Button 20
When the horizontal button 20A is pressed instead of C, the absolute horizontal posture based on gravity can be returned to the basic posture that is the target posture. Even in the manual control mode, the horizontal button 20A, the right lowering button 20B, and the left lowering button 20C can forcibly cause the rotary tiller 4 to perform a rolling operation to change its rolling posture. Each button 2
0A, 20B, and 20C promote the slow-speed operation of the lift rod 7 while the push operation is being performed, but the lift rod 7 may be operated by a constant amount each time the push rod is pressed.

Next, the control in the manual elevating mode in which the rotary tiller 4 is manually forcibly moved up and down will be described. The horizontal button 20A is also used as a mode selection operation tool for switching between the manual elevating mode and the rolling control mode, and the horizontal button 20A is configured as a momentary type switch that returns to the original position when the pushing operation is released. In addition to the horizontal button 20A, a key switch 22 is provided as a starting operation tool that starts the engine of the agricultural work machine and starts the entire control system including the control device 21. These two buttons, switch 20A,
When the engine is started while operating the button 22 and operating the button 20A, the automatic rolling control mode can be switched to the manual lifting mode.

In the manual elevating mode, the right lowering button 20B and the left lowering button 20C can be used to forcibly raise and lower the rotary tiller 4.
That is, by pressing one of the buttons 20B or 20C, the forced raising operation can be performed, and by pressing the other button 20C or 20B, the forced lowering operation can be performed. Such a manual elevating mode is required when the angle sensor 13 for detecting the angle of the lift arm 6 or the position setter 12 fails.
This is because the amount of vertical movement can be adjusted manually. When the horizontal button 20A is operated again in the manual elevating mode, the manual elevating mode is released and the automatic rolling control mode is restored. Also, without operating the horizontal button 20A,
When only the key switch 22 is operated, the control mode is set to the automatic rolling control mode. Thereby, even if the button 20B or 20C is operated, the rotary tiller 4 does not unexpectedly move up or down. However,
The alarm mechanism is operated in the manual elevating mode so that the rotary tiller 4 is prevented from rising or lowering unexpectedly and the operator intentionally operates it.

[Other Embodiments of the Invention] In the above-mentioned configuration, the horizontal button 20A is also used as the mode selection operation tool, but it may be provided separately from the horizontal button 20A. When switching from the rolling control mode to the manual elevating mode, an operation tool other than the key switch 22 may be used as an operation tool that is operated simultaneously with the mode selection operation tool 20. Although the adjusting operation tools 20B and 20C are composed of two buttons, a three-position switching type single operation tool or the like may be used. As the notification mechanism, a device that emits a sound such as a buzzer is desirable, but a device that blinks a lamp or the like may be used.

Incidentally, reference numerals are provided in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view of a rear part of a agricultural tractor and a rotary tillage device.

FIG. 2 is a circuit diagram of a lifting operation system and a rolling operation system of a rotary tiller.

FIG. 3 is a circuit diagram of a lifting operation system and a rolling operation system of a conventional rotary tiller.

FIG. 4 is a circuit diagram of a lifting operation system and a rolling operation system of a conventional rotary tiller.

[Explanation of symbols]

 4 Ground work device 20A Mode selection operation tool 20B, 20C Adjustment operation tool 21 Control means 22 Startup operation tool

Claims (4)

[Claims] 1. A ground work device (4) is provided so as to be vertically movable and rollable with respect to a traveling machine body, and the ground work device (4) is used in a rolling control mode for maintaining a rolling posture of the ground work device (4) at a target posture. 4) Adjustment operation tool (20B) for changing and setting the target posture,
(20C) and a mode selection operation tool (20A) for selecting a control mode are provided, and the adjustment operation tools (20B), (2
0C) and a control means (21) for driving and controlling the ground work device (4) in response to an operation command from the mode selection operation tool (20A). Then, when the agricultural working machine is started by operating the start operation tool (22) while operating the mode selection operation tool (20A) configured as a return type, the operation mode in the control means (21) is manually raised and lowered. Rolling / up / down operation structure of a ground work device for agricultural work machines configured to be set to mode. 2. The operation mode of the control means (21) is switched to a rolling control mode when the mode selection operation tool (20A) is operated again in the manual elevating mode. Ground work device rolling and lifting operation structure for agricultural work machines. 3. The ground work device for an agricultural work machine according to claim 2, wherein the operation mode of the control means (21) is set to a rolling control mode when only the activation operation tool (22) is operated. Rolling and lifting operation structure. 4. The ground work device rolling / lifting operation structure for an agricultural work machine according to claim 1, 2 or 3, wherein in the manual lifting mode, a notification mechanism is activated.