JPS648964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a means for attaching ground working devices such as a tilling device, a plowing harrow, or a seedling planting device to a traveling vehicle body through a vertically swingable lift arm and a lift rod attached to the vehicle body. They are linked and connected by their respective drive mechanisms so that they can be raised and lowered and tilted in the left and right directions of the vehicle.
The work device is provided with a sensor that detects the tilt state of the vehicle body in the left-right direction, and the tilt is configured such that the tilt state of the work device in the vehicle body left-right direction is maintained within a set range based on the tilt state detected by the sensor. a rolling control mechanism that automatically operates the tilting drive mechanism, and a posture control mechanism that automatically operates the tilting drive mechanism to return the working device to a specific posture with respect to the traveling vehicle body. , Concerning mobile agricultural machines for ground work, such as riding-type tillers and riding-type rice transplanters.

The above-mentioned vehicle is configured so that the work device can be maintained in a horizontal position and the work traveling can be performed satisfactorily regardless of whether the vehicle body is tilted in the left-right direction.

During non-work driving with the working equipment raised, such as when changing directions, the traveling vehicle body itself tilts left and right, so if the working equipment remains tilted with respect to the traveling vehicle body as described above, the inertia during turning will increase. Along with,
Due to the working equipment, the traveling vehicle body tends to be swung around, which may lead to rollover, etc., and as the working equipment is raised during non-work operation, the posture control mechanism returns the working equipment to a specific posture relative to the traveling vehicle body. I try to let them do it.

However, in conventional systems, the activation switch for the posture control mechanism is linked to the lever that raises the working equipment to the non-working position, and at the same time the lever that raises the working equipment to the non-working position is activated, the lever that raises the working equipment to the non-working position and returns the working equipment to the non-working position are activated. When the tilting motion and the tilting motion are performed all at once, and the drive reaction force for the tilting motion acts in the same direction as the direction of inertia during turning, it becomes even more likely to cause a rollover, which is dangerous.

SUMMARY OF THE INVENTION In view of the above-mentioned points, it is an object of the present invention to make it possible to safely raise a working device to a non-working position without causing it to fall due to turning.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A pair of left and right wheels 1 are mounted on the front and rear, and a control unit 2 is provided in the center of the vehicle, and the vehicle can be driven up and down via a pair of left and right lift arms 4 that are interlocked and connected to a lift cylinder 13 at the rear of the vehicle body. A rotary tiller 5, which is an example of a ground work device, is interlocked with the rotary tiller 5 to form a riding type tiller, which is an example of a mobile agricultural machine for ground work.

A bracket 9 with a pair of ground tail wheels 8 attached is attached to a frame 7 extending from the rotary frame 6 of the tilling device 5 so that the mounting height can be changed and fixed.
The structure is such that the ground support position of the plow can be changed and the set plowing depth can be changed.

A pair of left and right connecting arms 1 protrude from the rotary frame 6 to interlock and connect the tilling device 5.
0 and 10 are pivotally connected to a hitch 11 at the rear of the vehicle body in a vertically swingable manner, and lift arms 4 and 4 and connection arms 10 and 10 are respectively connected to a lift rod 12.
a, 12b, one single acting hydraulic cylinder 13 is interlocked and connected to the lift arms 4, 4, and the lift rods 12a, 1
A double-acting hydraulic cylinder 14 is interposed on one side 12a of the cylinders 2b and is configured to be extendable and retractable.

As shown in FIG. 3, a weight 16 is pivotally connected to the rotary frame 6 in a case 15 so as to be swingable around the axis in the longitudinal direction of the vehicle body, and a bill blocking member 16a is attached to the weight 16. are integrally connected, and
Stoppers 17, 17 for regulating the swinging of the banknote blocking member 16a in the left-right direction of the vehicle body within a set range
are provided, and photoelectric detection devices 18a and 18b are provided which detect by blocking light that the banknote blocking member 16a is at the right and left rocking limit positions, respectively, in the left and right direction of the vehicle body with respect to the horizontal plane of the tilling device 5. A horizontal sensor 19 is configured to detect the tilt state.

In the lift rod cylinder 14, the fourth
As shown in the figure, a cylinder body 2 is placed on the cylinder body 14a side.
0 on the other hand, and rod 2 on the cylinder rod 14b side.
1, and the rod 21 is fitted into the cylindrical body 20 so as to be able to swing freely, and a normally closed first switch is installed on the extension side within the cylindrical body 20 at a relatively small distance in the sliding direction. 22, and the second normally open type on the shortening side.
A switch 23 is provided, and depending on the operating state of the first and second switches 22 and 23, the telescopic lift rod 12a is longer than the other lift rod 12b, has approximately the same length, or is shorter than the other lift rod 12b. It is configured so that it can be determined.

A lever 24 is integrally and pivotally attached to the lift arm 4, and a third limit switch 25 is provided corresponding to the free end of the lever 24 so as to be activated when the lift arm 4 rises beyond a set angle. ing.

Switches 26a and 26b linked to the detection devices 18a and 18b, respectively, and first to third switches
For the switches 22, 23, 25, the control valve for the lift rod cylinder 14
As shown in FIG. 6, the extension side solenoid 27a and the contraction side solenoid 27b for operating the V ₁
1NOR circuit 30, third to fifth AND circuits 31,
32, 33, second and third OR circuits 34, 35, and transistors 36, 36 are connected via an electronic control circuit, and are configured to automatically perform the operations described below.

That is, in the tilling work state, the horizontal sensor 1
9 closes either the left or right switch 26a or 26b, the first NAND circuit 28 and the
The extension side solenoid 27a is connected via the 3AND circuit 31, the second OR circuit 34 and the transistor 36, while the second NAND circuit 29 and the fifth AND circuit 33,
The shortening side solenoid 27b is energized via the third OR circuit 35 and the transistor 36, and the lift rod cylinder 14 is operated, and the rolling control mechanism is activated to maintain the tilling device 5 in a horizontal position regardless of the tilt of the vehicle body. It is configured.

In addition, the tilling device 5 is activated by operating the single-acting cylinder 13.
When the lift arm 4 is swung upward by more than a set angle as a result of a forced upward operation, the third limit switch 25 is closed, and accordingly, when the tilling device 5 is not in a specific attitude (parallel attitude) with respect to the vehicle body. , a signal is input to the third and fifth AND circuits 31 and 33 via the first NOR circuit 30 and the fourth AND circuit 32, and both solenoids are switched on until both the first and second switches 22 and 23 are open. 27a,
The attitude control mechanism is configured so that either one of the two 27b is excited and the tilling device 5 is brought into a position parallel to the vehicle body.

An automatic/manual selector switch 37 is connected to the fourth AND circuit 32, and the lift rod cylinder 14
When manually operated, the electronic control circuit is opened by grounding to enable automatic operation.

Further, a manual switch 38 is connected to both the solenoids 27a and 27b, and after switching to the manual state by the changeover switch 37, the lift rod cylinder 14 is artificially expanded and contracted.

When attaching the lever 24 to the lift arm 4, the relative attachment angle can be changed via a long hole 39 formed in the lever 24. The third limit switch 25 is activated when the lift arm 4 is swung upward at a small angle.On the other hand, in a field where the vehicle body does not sink much, the third limit switch 25 is activated when the lift arm 4 is oscillated upward at a small angle.
The structure is such that the relative mounting angle can be adjusted as appropriate depending on the soil quality of the field.

The present invention can also be applied to a type in which the tilling device 5 is interlocked and connected so as to be freely raised and lowered through a link mechanism consisting of a pair of left and right lower links and a top link.

The present invention can be applied to various types of mobile agricultural machines for ground work in which various ground work devices 5 are interlocked and connected, such as a seedling planting device or a puddling harrow instead of the tillage device 5.

Instead of the single-acting hydraulic cylinder 13, a hydraulic motor or the like may be provided interlockingly connected to the support shaft of the lift arm 4, and these are collectively referred to as a drive mechanism 13.

Also, instead of the lift rod cylinder 14,
For example, the lift rod may be constructed of two members that are slidable relative to each other, one of which is provided with a threaded member that is rotatable only, and the other of which is provided with a threaded portion into which the threaded member is externally fitted; For example, by interlocking a hydraulic or electric motor with the
Various structural modifications are possible and are collectively referred to as the drive mechanism 14.

In summary, the present invention provides the above-mentioned mobile agricultural machine for ground work with a detection device 25 for detecting an upward swing of the lift arm 4 relative to the traveling vehicle body by an angle equal to or greater than a set angle, and also provides the detection device 25 and the attitude control device 25. It is characterized in that the mechanism is linked to prevent the operation of the rolling control mechanism and operate the attitude control mechanism based on the detection result of the detection device 25.

In other words, since it is detected that the lift arm 4 has actually swung up and down by more than a set angle, and the posture control mechanism is activated based on the result, when the working device 5 is raised to the non-working position during turning, it is possible to In turning movement, which is often performed while suppressing the tilting motion of the working device 5 with respect to the traveling vehicle body and raising the working device 5, a drive reaction force due to the tilting motion of the working device 5 is added to the inertial force accompanying the turning. can be suppressed. In other words, for example, regardless of the amount of rise of the work equipment, if the operation to correct the attitude of the work equipment with respect to the traveling vehicle body is immediately started just by detecting that the raising operation operation has been performed using the raising operation tool,
Both the inertia force associated with the turn and the driving reaction force caused by the tilting operation of the work device 5 may be applied to the vehicle body while it is turning, but in the present invention, the work device 5 is Since the tilting operation is not performed until the lift arm 4 has risen above the set angle, the work equipment can now be safely raised to a non-working position while avoiding as much as possible the risk of the vehicle overturning due to turning. .

Furthermore, since the attitude control mechanism is activated based on the upward swing of the lift arm 4 exceeding the set angle, a switch etc. for detecting the state of upward swing of the lift arm 4 exceeding the set angle can be easily attached to the vehicle body. This was advantageous in terms of assembly.

[Brief explanation of drawings]

The drawings show an embodiment of the mobile agricultural machine for ground work according to the present invention, in which Fig. 1 is a partially omitted overall side view of the riding-type cultivator, Fig. 2 is a perspective view of the main parts, and Fig. 3 is the main parts. 4 is a sectional view showing the mounting portion of the first and second switches, FIG. 5 is a perspective view showing the mounting portion of the third switch, and FIG. 6 is an electronic control circuit diagram. 4...Lift arm, 5...Ground work device, 1
2... Lift rod, 13... Drive mechanism, 14...
...Tilt drive mechanism, 19...Sensor, 25...
Detection device.

Claims (1)

[Claims] 1. The ground work device 5 is installed on the traveling vehicle body, and the respective drive mechanisms 13,
The working device 5 is provided with a sensor 19 that detects the tilting state of the vehicle body in the left-right direction, and the working device A rolling control mechanism is provided for automatically operating the tilting drive mechanism 14 so as to maintain the tilting state of the vehicle body 5 within a set range in the left-right direction, and the working device 5 is held in a specific posture with respect to the traveling vehicle body. The mobile agricultural machine for ground work is equipped with a posture control mechanism that automatically operates the tilting drive mechanism 14 so as to return the tilting drive mechanism 14, and the detection detects an upward swing of the lift arm 4 relative to a traveling vehicle body by an angle greater than or equal to a set angle. A device 25 is provided, and the detection device 25 and the attitude control mechanism are linked to prevent the operation of the rolling control mechanism and operate the attitude control mechanism based on the detection result of the detection device 25. A mobile agricultural machine for ground work that is characterized by: