JPH02291203A - Control device of pulling working machine to be attached to tractor - Google Patents

Abstract

PURPOSE:To readily confirm dial operation and to prevent maloperation by providing a position dial with revolutional resistance through frictional resistance caused by applying force of elastic material and supplying a draft dial with revolution resistance through engagement and disengagement by uneven part and elastic deformation. CONSTITUTION:In a position dial 12, a frictional plate 33 is equipped in a recessed part 32 of storage and a coil spring 34 as an elastic material is fixed in a compressed state between the frictional plate 33 and a supporting plate 31. When a draft dial 13 is rotated by operation, engaging and disengaging sound and vibration in engaging and disengaging are generated by engagement and disengagement caused by elastic deformation of recessed part of a clip 37 and an engaging part 41 of a leaf spring 39 and operation of the draft dial 13 can be confirmed hy affirmation of the engaging and disengaging sound and touch of vibration during engaging and disengaging. In the case of revolutional operation of the position dial 12, neither engaging and disengaging sound nor vibration occurs. Operation of the position dial 12 or the draft dial 13 can be readily confirmed without watching and maloperation can be effectively prevented even if both the dials are closely positioned.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a traction work machine control installed on a tractor that automatically controls the height and traction load of a work machine such as a plow or a rotary tiller installed on the tractor. Regarding equipment.

(Prior Art) Conventionally, a working machine such as a plow or a rotary tiller is mounted on the rear side of a tractor so that it can be raised and lowered by a hydraulic system for raising and lowering the working machine, and a control device that controls the raising and lowering of the hydraulic system is adjusted. Some devices are configured to control the work equipment so that it does not descend below a desired height, or to prevent a traction load greater than desired from being applied to the work equipment. As a means of adjusting these control devices, a position dial for position control that adjusts the height of the work equipment and a draft dial for load control that adjusts the traction load are provided, and electric signals are generated by adjusting the rotation of each dial. There were different control methods.

(Problem to be solved by the invention) However, for the purpose of improving operability, each dial is placed close to each other and each dial is configured in the same way, so it is difficult to operate the position dial by just using the touch of the hand. , It was difficult to determine whether the draft dial was being operated or not, and there was a high risk of erroneous operation.

Therefore, in view of the above-mentioned problems, the present invention allows users to recognize which dial is being operated by the sound and feel when each dial is rotated, thereby preventing erroneous operation.
The purpose is to improve operability.

(Means for solving the problem) The technical means is such that a towing work machine 5 attached to a tractor 1 can be raised and lowered by a hydraulic device 3 for raising and lowering the work machine,
A position dial 12 for position control that adjusts the height of the work implement 5 in the control device, and a draft dial for load control that adjusts the traction load of the work implement 5 in the control device. 13 arranged in close proximity to each other, the position dial 12 has an elastic body 3 interposed between the dial 12 and the vehicle body side.
The draft dial 13 has an uneven portion 37 provided on either the dial 13 or the vehicle body side, and an elastic body 39 provided on the other side. The point is that rotational resistance is provided by engagement and disengagement with the provided locking portion 41 due to elastic deformation.

(According to the present invention, when the position dial 12 is rotated, it is rotated against the frictional resistance due to the urging force of the elastic body 34, so the rotational resistance is constant and there is no rotation. Operations can be performed step by step.

Further, when rotating the draft dial 13, after disengaging the engaging portion 41 of one of the uneven portions 37 and the other elastic body 39 by elastic deformation of the elastic body 39, Since it is elastically engaged with the part 37 and rotated by repeating the engagement and disengagement in sequence, engagement and disengagement noise and vibration are generated when engaging and disengaging.
It can be confirmed that the draft dial 13 is being operated by checking the sound of engagement and disengagement and the feeling of vibration during engagement and disengagement. Furthermore, since the concavo-convex portion 37 and the locking portion 4l are engaged with each other, there is no possibility of inadvertent positional displacement.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. In Fig. 4, 1 is a tractor, 2 is a rear wheel, 3 is a hydraulic system for lifting and lowering a work machine, and a pair of left and right lift arms are shown. It has 4. Reference numeral 5 denotes a plow as a towing work machine, which is attached to the rear side of the tractor l via a three-point linkage mechanism 6. The three-point lean mechanism 6 includes a top link 7 and a pair of left and right lower links 8, and the lower links 8 are connected to the lift arm 4 via a lift rod 9. Incidentally, the lift rod 9 is constituted by a hydraulic cylinder and is extendable and retractable.

As shown in FIG. 5, the control device for controlling the hydraulic system 3 is an operation dial 12. of an operation panel l1 mounted at an appropriate position on the vehicle body. 13, and each dial 12. 1
control circuit 14 that sends a signal in accordance with the rotation operation of No. 3; and control that supplies or drains the pressure oil sent from the hydraulic pump 15 into the cylinder l6 of the hydraulic device 3 in response to a signal from the control circuit l4. It includes a valve l7, a position sensor 18 that detects the movement of the elevator opening of the lift arm 4, and a draft sensor 20 that detects the traction load acting on the lower link 8 via the link mechanism 19.

When the position dial 12 is rotated, the control valve l7 is opened and closed by a signal from the control circuit 14, the cylinder l6 expands and contracts, and the plow 5 is set at a desired height by feedback from the position sensor 18; Do not descend below that position.

Further, if the draft dial 13 is rotated to set the desired traction load, if the load becomes larger than the set load, the control valve 17 is operated to open or close in response to a signal from the draft sensor 20, the cylinder 16 is contracted, and the traction load is set to a desired value. Raise the plow 5 so that the load reaches the set load. When the traction load becomes smaller, the control valve 17 is opened and closed in response to a signal from the draft sensor 20, the cylinder l6 is extended, and the plow 5 is lowered. It should be noted that the lowering position of the plow 5 is given priority to the position set by the position dial 12.

Further, in FIG. 5, reference numeral 22 denotes an auxiliary control hub, which is used to take out hydraulic equipment mounted on the tractor 1. 23 is a flow priority valve provided in the auxiliary control valve 22, and is configured to supply pressure oil preferentially to the horizontal control valve 24. The horizontal control valve 24 is opened and closed by a signal from a horizontal sensor 25 provided in the working machine, etc., and is configured to extend and retract the lift rod 9 to horizontally control the working machine mounted on the lower link 8 side. A stroke sensor 26 detects the expansion and contraction of the lift rod 9.

The position dial 12 and the draft dial 13 are arranged close to each other in parallel on the operation panel 11, and as shown in FIG. 1, a control case 27. The operating shaft 29, which protrudes from 28, is fixed to the upper end of 30. The control cases 27 and 28 are fixed to a support plate 3l fixed to the vehicle body side of the tractor 1 with screws or the like.

The position dial 12 has a storage recess 32 formed on the lower surface, a friction plate 33 is installed in the four storage parts 32, and a coil bar 34 as an elastic body is compressed between the friction plate 33 and the support plate 31. It is installed. The friction plate 33 is pressed against the lower surface of the dial 12 by the biasing force of the coil spring 34, and the rotation resistance of the dial 12 is caused by this friction F.
'It is configured with a friction method provided by resistance.

Further, the draft dial 13 has a concave portion 36 formed on its lower surface, and a chrysanthemum seat 37 as an uneven portion shown in FIG. 2 is formed in the circumferential direction on the bottom surface of the concave portion 36. Further, a support stand 38 is fixed on the support plate 31, and a spring plate 39 as an elastic body, which is suitably bent, is fixed on the support stand 38. Rising portion 4 bent above spring plate 39
0 is inserted into the recess 36, and a locking portion 41 provided at the upper end is resiliently engaged with the recess of the chrysanthemum seat 37 due to its elastic deformation in a detachable manner.

The rotational resistance of the dial 13 is provided by a launch method, which is provided by resistance caused by engagement and disengagement between the locking portion 41 and the concave portion of the chrysanthemum seat 37.

Also, each dial 12. The outer circumferential surface of the dial 12.13 is formed with unevenness such as a low resoto, and a protrusion 43 is formed at one location on the outer circumferential surface. 13 can be determined by the touch of the hand without being visually recognized by the position of the protrusion 43.

The embodiment of the present invention is constructed as described above, and the position dial 12 is a friction type, and the draft dial 13 is a launch type. Due to the elastic deformation of the locking portion 41 of the spring plate 39, engagement and disengagement generate noise and vibration during engagement and disengagement, and by checking the engagement and disengagement sound and feeling the vibration during engagement and disengagement, the draft dial 13 can be adjusted. You can confirm that it is working. In addition, when the position dial 12 is rotated, there is no sound loss or vibration, and it is possible to easily check whether the position dial 12 or the draft dial 13 is being operated without visual confirmation, and the position dial 12 is placed close to the other. Errors can be effectively prevented even if the

Furthermore, since the position dial 12 can be rotated using a friction method, the height of the plow 5 can be adjusted steplessly.On the other hand, the draft dial 13 can be adjusted to a predetermined position by engaging the locking part 41 and the concave part of the chrysanthemum seat 37. It is held in position, prevents accidental displacement, and maintains the desired traction load setting. Furthermore, by adjusting the engagement and disengagement between the locking portion 41 and the recessed portion of the chrysanthemum seat 37 for each rotation, fine adjustment of the plowing depth becomes possible.

For example, the angle of one launch of the unevenness of 37 chrysanthemums is 4.5 to 5.
If the setting is set at 100 m, a plowing depth difference of about 5 to 10++ m can be obtained.

In addition, a chrysanthemum seat 37 is provided on the side of the support stand 38, and the base board 39 is set at 1.
It may be configured to be fixed to the shift dial 13 side.

(Effects of the Invention) According to the present invention, the towing work machine attached to the tractor can
The work machine can be raised and lowered by a hydraulic system for raising and lowering the work machine, and is equipped with a control device that controls the raising and lowering of the hydraulic system, and a position dial for position control that adjusts the height of the work machine in the control device, and a traction load of the work machine in the control device. The position dial is provided with rotational resistance due to frictional resistance due to the biasing force of an elastic body interposed between the dial and the vehicle body. The draft dial provides rotational resistance through engagement and disengagement due to elastic deformation between the uneven part provided on either side of the dial and the vehicle body and the locking part provided on the elastic body provided on the other side. It is possible to easily confirm which dial is being operated without visual confirmation by the feel of operation of each dial and the sound of engagement and release, and erroneous operation can be effectively prevented. In addition, since the position dial is a friction type, the height of the work equipment can be adjusted steplessly.
The engagement between the locking part and the concave and convex parts of the draft dial prevents misalignment, stabilizes the settings, and improves operability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the main part, FIG. 2 is a cross-sectional view taken along the line nn in FIG. 1, FIG. 3 is a perspective view of the dial, and FIG. 4 is a side view of the whole 5 are circuit explanatory diagrams. DESCRIPTION OF SYMBOLS 1...Tractor, 3...Hydraulic system, 5...Brow, 12...Position dial, 13...Draft dial, 34...Coil spring, 37...Chrysanthemum seat, 3
9... Spring plate, 41... Locking part.

Claims (1)

[Claims] (1) The traction work machine (5) attached to the tractor (1) can be raised and lowered by the hydraulic system (3) for raising and lowering the work machine,
A control device for controlling the elevation of the hydraulic system (3), a position dial (12) for position control for adjusting the height of the work implement (5) in the control device, and a traction load of the work implement (5) in the control device. The position dial (12) has a load control draft dial (13) arranged close to it for adjusting the load control, and the position dial (12) is attached to an elastic body (34) interposed between the dial (12) and the vehicle body side. The draft dial (13) has an uneven part (37) provided on either the dial (13) or the vehicle body side, and an elastic part provided on the other side. A towing work machine control device mounted on a tractor, characterized in that rotational resistance is provided by engaging and disengaging with a locking portion (41) provided on a body (39) through elastic deformation.