JPS6113761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilling resistance adjusting device for automatically adjusting the tilling resistance within a set value range when performing tilling work using a ground work machine such as a plow. .

In the conventional tillage resistance adjustment device, as shown in Fig. 1, the upper part of an arm 3 which is pivotally connected to the rear upper part of the tractor 1 with a pin 2 is pivotally connected to the rear part of the draft rod 5 of the tillage resistance adjustment device with a pin 4. The front part of the top link 8 which is pivotally connected to the mast 7 of the ground work equipment 6 is pivotally connected to the arm 3 by a pin 9, and the left and right lower links 10, 10 which are pivotally connected to the rear lower part of the tractor 1 are The front part of the ground work machine 6 is connected to the lifting adjustment mechanism 1.
The left and right lift arms 13, 13, which are configured to be freely rotatable up and down by one hydraulic cylinder 12, are connected to lower links 10, 1 via lift rods 14, 14.
Since it is connected to 0, the tilling body 1 of the ground work machine 6
For example, if the tilling resistance acting on the tractor 5 increases, the upper part of the mast 7 will move towards the tractor 1, and the upper part of the arm 3 will push the draft rod 5 in the same direction, resulting in the adjustment of the tilling resistance. The link mechanism of the device pushes the spool 17 of the control valve 16 of the elevation adjustment mechanism 11 to the left in the figure, so that pressure oil is supplied to the hydraulic cylinder 12 and the lift arms 13, 13 move upward. As the ground work machine 6 moves upward, the tilling resistance also decreases, so the upper part of the mast 7 moves away from the tractor 1, and the draft rod 5 also moves in the same direction, and at this time, the spool 17 also moves away from the tractor 1. Returning to the right side of the figure, the supply of pressure oil to the hydraulic cylinder 12 is stopped, and the tilling resistance that pushes the draft rod 5 through the arm 3 is balanced by a spring (not shown) of the tilling resistance adjusting device. The structure is maintained within a set value range that meets the requirements.

However, when the tractor 1 enters from a hard soil area to a soft sandy area and the drive wheels 18 slip, the tractive force of the tractor 1 decreases rapidly, and the tilling resistance also sharply increases. There is a problem in that the pushing force in the direction is also reduced and the ground working machine 6 is lowered, making plowing work impossible.

Therefore, the present invention is configured to accurately detect the slip state of the drive wheel 18 and control the elevation of the ground working machine according to the size of the slip, so that the tilling work can be carried out regardless of changes in the properties of the soil. The configuration is explained based on the illustrated embodiment, and as shown in FIGS. 2 to 5, the frame 19 is attached to the ground work machine 6. A disc 20 is rotatably provided through the tiller, and the disc 20 rolls into contact with the vicinity of the corner 23 between the tiller 21 and the uncultivated land 22, where the topsoil has been removed by the tiller 15 and exposed. The rear part of the ground work machine 6 is configured to be supported by this disk 20.

A drive wheel rotation detection unit 24 is provided which can detect either the circumferential speed of rotation of the drive wheel 18 or the distance traveled by rotation of the disk 20. A disk rotation detecting section 25 is provided which can detect the rotation of the drive wheel, and an output difference detecting section 26 is provided which detects the difference between the output of the drive wheel rotation detecting section 24 and the output of the disk rotation detecting section 25.

Then, a standard output difference range is determined taking into account the slip of the driving wheels 18 that normally occurs in a stable tilling work state, and the above standard output difference range set by the standard output difference setting unit 27 is set by the output difference detection unit 26.
An actuating section 28 is provided so as to input the spool 17 of the elevation adjustment mechanism 11 in the upward direction or downward direction of the ground work machine 6, and an operation control system for instructing the actuating section 28 to control such movement. The section 29 is connected to both the operating section 28 and the output difference detection section 26, and the output difference between the drive wheel 18 and the disc 20 detected as described above is within the standard output difference range from the standard output difference setting section 27. , no command is issued from the operation control section 29 to the operation section 28; however, when the output difference exceeds the standard output difference range, the operation section 28 moves the spool 17 to the ground work machine 6.
The operation control section 29 is configured to output an operation command to the operation section 28 so as to move the spool 17 in the upward direction. Ground work equipment 6
The configuration is such that the operation control section 29 gives an operation command to the operation section 28 so as to move in the downward direction. The actuating portion 28 shown in the figure is configured to be able to move the spool 17 via a rotatable arm 31 using a moving rod 30 that can be moved in and out.

Since the tilling resistance adjusting device according to the present invention is configured as described above, when the tilling resistance is within the appropriate range, the rotational speed or rotational distance of the drive wheels 18, 18 is greater than the rotational speed or rotational distance of the disc 20. Since the output of the output difference detection unit 26 is within the standard output difference range from the standard output difference setting unit 27, there is no output from the operation control unit 29, and therefore the ground work equipment 6 remains as it is. The plowing depth will be maintained.

When the tilling resistance increases due to entering hard soil, or when the slip of the drive wheels 18, 18 increases due to entering sandy soil, the rotational speed and rotation distance of the drive wheels 18, 18 also change. Since the output difference of the output difference detection section 26 exceeds the standard output difference range from the standard output difference setting section 27, an operation command is issued from the operation control section 29. The actuating unit 28 moves the spool 17 in the direction of raising the ground work machine 6, and as a result of this raising operation, tilling resistance decreases and the drive wheels 18, 18
The slip is also reduced, and the output of the operation control section 29 is also eliminated, so that the ground work machine 6 is held in the same position.

On the other hand, when the tilling resistance becomes too small, the drive wheels 18, 18 will not slip, so the above output difference will also fall below the standard output difference range, and the spool 17 will be lowered by the ground work machine 6. A command to operate the actuator 28 in the direction of
I will be leaving from 9.

A disk 20 is used to detect the traveling speed or traveling distance of this ground work machine 6.
The plowing plate 21, which has been flattened by the plowing body 15, and the uncultivated land 22 are arranged so as to be in contact with each other in the vicinity of the corner 23. This influence can be eliminated, and the disk 20 can always roll on a smooth straight plane, and the rotation of the disk 20 allows the disk rotation detection unit 24 to accurately measure the running speed or distance of the ground work equipment 6. Therefore, the automatic adjustment operation of the tilling resistance by the device of the present invention is accurate.

[Brief explanation of drawings]

Fig. 1 is a side view of a tractor to which a conventional tilling resistance adjustment device is applied, Fig. 2 is a side view of a tractor to which an embodiment of the present invention is applied, and Fig. 3 shows the main parts of the tilling body in Fig. 1. A-A line arrow view shown, No. 4
The figure is a view taken along the line B--B showing the disk in FIG. 1, and FIG. 5 is a control circuit diagram of the device according to the invention. Description of symbols, 1... Tractor, 2, 4, 9... Pin, 3, 31... Arm, 5... Draft rod, 6... Ground work equipment, 7... Mast, 8... Top link, 10... Lower link, 11... Lifting adjustment mechanism, 12... Hydraulic cylinder, 13... Lift arm, 14... Lift rod, 15... Cultivating body, 16... Control valve, 17... Spool, 18... Drive wheel, 19...Frame,
20...Disk, 21...Plowing plate, 22...Uncultivated land, 23...Corner part, 24...Drive wheel rotation detection section, 25...Disk rotation detection section, 26...Output difference detection section, 27 ...Standard output difference setting section, 28...
Actuation section, 29... Actuation control section, 30... Moving rod.

Claims (1)

[Claims] 1. A disk is provided to support the rear part of the ground working machine while making rolling contact with the corner of the plow cut by the ground working machine, and the rotational speed or rotational distance of the drive wheel of the tractor and the rotational speed or rotational distance of the above-mentioned disk are provided. A detection unit is provided to detect the rotational speed, and when the rotational speed difference or rotational distance difference between the drive wheel and the disk in the detection unit exceeds a set range value, the ground work equipment is raised; A tilling resistance adjustment device for a tractor, comprising an operation control unit that interlocks and operates respective elevation adjustment mechanisms so as to lower a ground work machine when the difference or the rotation distance difference is below a set range value.