JPH0132808Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides a drive mechanism that forces the ground work device to roll with respect to the traveling aircraft, and a pair of left and right buffer springs are interposed between the drive mechanism and the ground work device. The present invention relates to a rolling device for a ground work device in a working machine such as a riding rice transplanter or a riding tiller.

In a conventional rolling device of this type, for example, a rolling device for a riding rice transplanter, as shown in FIG. A sensor 50 is provided, and a cylinder case 52a of a fluid pressure cylinder 52 constituting a rolling drive mechanism is pivotally connected to a bracket 51 on the traveling body A side.

Furthermore, the piston rod 52b of the fluid pressure cylinder 52 is attached to the bracket 5 on the side of the planting device B.
3 to be penetrated and supported by the bracket 5.
Spring receiving members 54 are fixed to both sides in the rod penetration direction of No. 3 and at two locations on the piston rod 52b,
54 between the buffer springs 24, 24, respectively.
was interposed.

Then, the operation of the fluid pressure cylinder 52 is controlled based on the detection signal of the horizontal sensor 50 so that the planting device B assumes a horizontal posture.

In addition, when one of the left and right sides of the planting device B collides with an obstacle such as a stone or a clod of soil existing in the field, the planting device B resists the elastic biasing force of one of the buffer springs 24 and the rolling axis By swinging around the planting device B, the impact force acting on the planting device B can be absorbed and alleviated, and damage to the planting device B can be suppressed.

However, in the above conventional structure, the spring receiving members 54, 54 are fixed to the piston rod 52b of the fluid pressure cylinder 52, and the urging force of the left and right buffer springs 24, 24 cannot be adjusted. There were some shortcomings.

That is, as shown in Fig. 7, even under planting conditions where both the plow surface and the mud surface are horizontal, there may be an imbalance in left-right balance due to the arrangement of parts attached to planting device B, or manufacturing errors or assembly errors. If the weight balance in the left-right direction of the planting device B is disrupted due to an error or the like, the planting device B will tilt to one side of the left or right around the rolling axis X. The horizontal attitude is corrected by controlling the operation of the fluid pressure cylinder 52 based on the detection signal. As a result, in the neutral state of rolling control in which the planting device B is in a horizontal position, one buffer spring 24 is compressed to a greater extent than the other buffer spring 24, and the piston of the fluid pressure cylinder 52 is activated. This results in a state where the stroke is shifted to one side in the left-right direction from the center position of the stroke.

Therefore, in the neutral state of rolling control, the operating stroke of the hydraulic cylinder 52 to the left or right is shortened, resulting in a disadvantage that the range in which rolling control is possible is correspondingly narrowed.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to eliminate the above-mentioned conventional drawbacks by simply modifying both of the buffer springs.

A rolling device for a ground working device according to the present invention, which has been made to achieve this object, is provided with a mechanism that allows the elastic force of both the buffer springs to be adjusted relative to each other in the left and right directions.

In other words, in the present invention, for example, under conditions where the weight balance of the ground work device is disrupted, the adjustment mechanism is operated to provide a difference in the elastic force of both buffer springs, and the difference in elastic force is used to Since the ground work device can be corrected to a horizontal position, the rolling drive mechanism can be maintained at the center position of the operating stroke as much as possible in the neutral state of rolling control.

Therefore, with a simple improvement that allows the elastic force of both buffer springs provided to protect the ground work equipment from obstacles to be relatively adjustable on the left and right sides, it is possible to adjust the elastic force of the ground work equipment in the left and right direction. Even under conditions where the weight balance is disrupted, it has become possible to equalize the rolling control range in the left and right direction by the rolling drive mechanism.

Hereinafter, embodiments of the present invention will be described based on the drawings.

To configure a riding rice transplanter, which is an example of a working machine,
Traveling aircraft A equipped with front and rear wheels 1, 2 and a control unit 3
A top link 4 and a pair of left and right lower links 5, 5 are provided at the rear of the machine, and a hydraulic pressure for raising and lowering is provided between the top link 4 and the traveling body A. A cylinder 6 was constructed, and a connecting frame 7 constructed between the rear portions of both the links 4 and 5, 5 was equipped with three ground floats 8 and a seedling stand 9 arranged in parallel in the left and right direction. Planting transmission case 1 of planting device B
0, and a pair of left and right suspension links 11, 11 arranged in a posture along both left and right hypotenuses of an inverted trapezoid when viewed from the front so that their extension lines intersect at a position near the grounding surface of the grounding float 8. The planting device B is configured so that it can be driven up and down with respect to the traveling body A by the expansion and contraction operation of the hydraulic cylinder 6, and the intersection of the extension lines of the hanging links 11, 11 is used as a fulcrum. It is configured to roll freely.

In addition, the drive mechanism 12 that forcibly rolls the planting device B with respect to the traveling body A and the grounding floats 8 on both the left and right sides swing up and down by more than a set value as the ground pressure changes. Sensors 13 and 1 each have a reed switch and are detected separately.
3, and the sensors 13, 13
Based on the detection result, the elevation control valve 14 of the hydraulic cylinder 6 and the motor 15 of the drive mechanism 12 are automatically operated so that the left and right detected values, that is, the left and right planting depths are maintained within the set range. A mechanism 16 for controlling the operation is provided.

The rolling drive mechanism 12 is constructed as follows.

A motor 15 capable of forward and reverse rotation is attached to the connecting frame 7 so as to be swingable around the front and rear axis.
5 is connected to an inner screw shaft 17 of screw shafts 17 and 18 screwed together so as to be expandable and contractible with relative rotation. On the other hand, of the pair of left and right columns 19, 19 that support the inclined upper side portion of the seedling stand 9 so as to be able to reciprocate in the left and right direction, a bracket 20 fixed to the column 19 on the side where the motor 15 is located has the A member 21 for externally fitting and supporting the outer screw shaft 18 in a slidable and movable manner is provided, and a receiving member 22 is fitted externally to the outer screw shaft 18 with an appropriate interval between both sides of the support member 21 in the screw shaft insertion direction. , 22, a pair of left and right buffer springs 24, 24 are interposed.

When one of the left and right sides of the planting device B collides with an obstacle such as a clod of soil or a stone, the pair of buffer springs 24, 24 cause the planting device B to swing away from the obstacle against the elastic biasing force. By doing so, the impact force at the time of the collision is absorbed and alleviated.

Therefore, among the spring receiving members 22, 22,
By moving this spring receiving member 22 in the distance direction with respect to the support member 21 between the spring receiving member 22 located on the motor 15 side and the tongue piece 23 fixed to the outer screw shaft 18, one of the springs 2
Two bolts 25, 25 that can adjust the elastic force of 4
are provided to constitute a mechanism for relatively adjusting the elastic force of both the buffer springs 24, 24 laterally.

The outer circumferential surface of the support member 21 and the receiving surface of the bracket 20 that is in contact with the support member 21 are configured in a spherical shape that allows the support member 21 to swing about its center as a fulcrum, and The hole and the outer screw shaft 18 are formed into an irregular shape such as a square that makes it impossible for the two screw shafts 21 and 18 to rotate relative to each other, that is, for the screw shafts 17 and 18 to rotate together.

In the above-mentioned embodiment, the left and right posture of the planting device B was controlled based on the sensors 13, 13 that detect the vertical movement of the left and right grounding floats 8, 8, but instead of this, as shown by the imaginary line in FIG. In addition, a sensor 13' for detecting the horizontal inclination of the planting device B with respect to the horizontal plane may be provided, and the lateral posture of the planting device B may be controlled based on this sensor 13'.

[Brief explanation of drawings]

Figure 1 is an overall side view of the riding rice transplanter, Figure 2 is a partially cutaway front view of the planting device, Figure 3 is a plan view of the main parts, Figure 4 is an enlarged sectional view of the main parts, and Figure 5 is 4, FIG. 6, and FIG. 7 are schematic diagrams each illustrating the operating state of a conventional rolling device. A... Traveling aircraft, B... Grounding work device, 12...
... Drive mechanism, 13 ... Sensor, 15 ... Motor, 17, 18 ... Screw shaft, 24 ... Buffer spring, 25 ... Adjustment mechanism.

Claims (1)

[Claims for Utility Model Registration] A drive mechanism 12 for forcibly rolling the ground work device B with respect to the traveling body A is provided, and a pair of left and right buffer springs 24 are provided between the drive mechanism 12 and the ground work device B. 24, which is a rolling device for a ground working device in a working machine, characterized in that it is provided with a mechanism 25 that can relatively adjust the elastic force of the buffer springs 24, 24 on the left and right sides. Rolling device for ground work equipment. The drive mechanism 12 automatically controls the operation based on the detection results of sensors 13, 13 that detect the left and right ground working heights of the ground working device so that the detected working heights are maintained within a set range. A rolling device for a ground working device in a working machine as set forth in claim 1 of the utility model registration claim. The driving mechanism 12 is provided with a motor 15 that can be switched between forward and reverse directions, and two screw shafts 17 and 18 that are connected to the motor and can be telescopically operated. Rolling device for ground work equipment in work equipment. The adjustment mechanism 25 has left and right springs 24,
24. A rolling device for a ground working device in a working machine according to any one of claims 1 to 24, wherein the rolling device is configured to adjust each part of the ground working device separately. A rolling device for a ground working device in a working machine according to any one of claims 1 to 3, wherein the adjustment mechanism 25 adjusts only one spring 24. A rolling device for a ground working device in a working machine according to any one of claims 1 to 3, wherein the ground working device B is a seedling planting device.