JPH036168Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a rice field working machine such as a riding rice transplanter or a riding direct sowing machine. A grounding float is attached to the device so as to be able to swing up and down about a rear fulcrum via a bending link pivotally connected to the front bracket and a swinging link pivotally connected to the rear bracket of the grounding float. A mechanical float height adjustment mechanism is provided between the swing link and the working device, which can change the position of the entire grounding float up and down in a state that is substantially parallel to or close to the working device, and a mechanism for adjusting the height of the grounding float up and down. The present invention relates to a working machine for paddy fields that is provided with a mechanism that operates a drive elevation control valve of a working machine in conjunction with a change in the relative posture of a bending link that accompanies swinging.

[Conventional technology]

In this type of paddy field work machine, the pivot connecting members constituting the float height adjustment mechanism are simply pivotally connected to each other by a connecting pin or the like.

[Problem that the invention attempts to solve]

In the case of this conventional device, as the pivot connecting member of the float height adjustment mechanism rotates relative to each other, it is inevitable that the sliding contact and rotation surfaces of both of them will gradually wear out.
Therefore, when a slight play occurs due to such wear, the pivot connecting members can move freely within the range of this play, and the sliding contact between the two is caused by the vertical movement of the grounding float. The sliding surfaces come into contact with each other in an impactful manner, and as a result, the backlash rapidly increases due to the sagging of the sliding and rotating surfaces due to such impact, and the resulting fluctuation in the sensing angle of the grounding float As a result, there has been a problem in that the precision in controlling the elevation of the working device gradually decreases.

An object of the present invention is to suppress the occurrence of backlash in each pivot connecting member of the float height adjustment mechanism as much as possible, and to enable precise lifting and lowering control of the working device over a long period of time.

[Means for solving problems]

The characteristic structure of the paddy field work machine according to the present invention is that it is provided with a mechanism that applies a biasing force to one side to the pivot connecting member of the float height adjustment mechanism, and its functions and effects are as follows. That's right.

[Effect]

Even when a slight backlash occurs due to wear of the sliding contact surface due to relative rotation of the pivot connecting member of the float height adjustment mechanism, the biasing mechanism keeps the pivot connecting member on one side of the play. Since the grounding float is biased toward the ground float, even if the grounding float swings up and down, the two sliding surfaces do not come into contact with each other in a shocking manner as in the conventional case.

[Effect of idea]

Therefore, although it is a simple modification that only biases the pivot connecting member of the float height adjustment mechanism to one side,
Because it is possible to avoid sagging of the sliding contact rotation surface due to impact and limit the wear only to sliding contact rotation,
It has become possible to better suppress the occurrence of backlash in the pivot joint than in the past, and it has become possible to control the lifting and lowering of the working device with high accuracy over a long period of time.

〔Example〕

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

B is an example of a working device, and is a seedling planting device that is connected to the machine A via a parallel quadruple link mechanism 1 so as to be able to rise and fall. It is mounted so that it can be driven reciprocally, and the planting claws 4 are mounted so that it can be driven freely up and down.

Reference numeral 5 designates a grounding float located below the planting device B, which includes bending links 6a, 6b pivoted to the front bracket 5a and an L-shaped swinging link 7 pivoted to the rear bracket 5b. It is attached to the planting transmission case 2 via the transmission case 2 so as to be able to swing vertically around a rear fulcrum.

8 is a hydraulic cylinder for driving up and down the seedling planting device B installed between the machine A and the parallel quadruple link mechanism 1, and a control valve 9 is interposed in the hydraulic circuit for this hydraulic cylinder 8. are doing.

10 is a mechanical float height adjustment mechanism, which is connected to the bracket 11 of the planting transmission case 2.
An L-shaped link 10a is pivotally connected to the upper bending link 6a, and the swinging link 7 and the L-shaped link 10a are pivotally connected via a rod 10b. By swinging the operating lever 10c linked to the support shaft 12 of the link 7, the entire grounding float 5 is moved up and down in a state that is substantially parallel to or close to the planting transmission case 2, thereby planting. It is configured so that the setting depth can be changed.

Reference numeral 13 denotes a mechanism for operating the control valve 9 in conjunction with changes in relative posture of the bending links 6a and 6b as the grounding float 5 swings up and down. The interlocking mechanism 13 for this lifting/lowering control consists of a fulcrum shaft 1 with a dual structure inside and outside provided near the control valve 9.
An arm 16 is fixed to one end of the inner fulcrum shaft 14 of the inner fulcrum shaft 14, which is capable of forcibly switching the spool 9a of the control valve 9 into three states: a descending state, a neutral state, and an ascending state. 14
A spring 19 for linking the arm 17 fixed to the other end with the lower bending link 6b via a release wire 18 and biasing the control valve 9 in the upward state; and the lower bending link 6b. A spring 20 is provided which swings and biases the grounding float 5 in the direction of contact with the ground.

Then, when the grounding pressure of the grounding float 5 increases and swings upward, the inner wire 18a of the release wire 18 is relaxed as the bending links 6a, 6b change their posture in the direction of decreasing the bending angle. Then, the spool 9a of the control valve 9 is switched to the raised state by the elastic biasing force of the spring 19, and the seedling planting device B is driven up. Due to this driving rise, the grounding float 5 relatively descends and the inner wire 18a is tensed to its original state.
The control valve 9 is automatically returned to the neutral state, and the raising of the seedling planting device B is stopped. By such upward control, the ground pressure of the ground float 5 is maintained at the set value, and the planting depth is kept substantially constant. When the ground pressure of the ground float 5 becomes smaller than the set value, exactly the opposite effect occurs.

Reference numeral 21 denotes a lever for setting and adjusting the biasing force of the spring 20, that is, the sensed ground pressure of the ground float 5 via the release wire 22.

Reference numeral 23 denotes a mechanism that applies a biasing force to one side, that is, a biasing force to the side on which the grounding float 5 descends, to the link 10a and the rod 10b, which are the pivot connecting members of the float height adjustment mechanism 10. This is done by screwing the vertical posture adjustment bolt 23b onto the bracket 23a attached to the planting transmission case 2, and also by screwing the bolt 23b into the bracket 23a attached to the planting transmission case 2.
A spring 23c is interposed between the link 10a and the link 10a, and the biasing force of the spring 23c can be adjusted by screwing the bolt 23b.

By such a biasing mechanism 23, the link 10a
By applying a biasing force to one side and the rod 10b, the cause of play in each of these pivot joints can be limited to only the wear caused by the relative sliding contact and rotation surfaces. This makes it possible to satisfactorily suppress the occurrence of backlash. Therefore, it is possible to control the raising and lowering of the seedling planting device B with high precision over a long period of time by suppressing the adverse effect on the sensor function of the grounding float 5 caused by such backlash.

[Brief explanation of the drawing]

The drawings show an embodiment of the paddy field work machine according to the present invention, with FIG. 1 being a lifting control system diagram and FIG. 2 being an overall side view. A...This machine, B...Working equipment, 5...Grounding float, 5a, 5b...Bracket, 6a, 6b...
... Refraction link, 7 ... Swing link, 9 ... Drive elevation control valve, 10 ... Float height adjustment mechanism,
10a, 10b... Pivot connection member, 13... Interlocking mechanism.

Claims (1)

[Claims for Utility Model Registration] A grounding float 5 is attached to a working device B connected to the machine A so that it can be driven up and down, and bending links 6a, 6 are pivotally connected to its front bracket 5a.
b and a swinging link 7 pivotally connected to the rear bracket 5b, the grounding float 5 is attached so as to be swingable up and down around the rear fulcrum, and the bending link 6 of the grounding float 5 is
a, 6b and between the swing link 7 and the working device B, there is a mechanical float height adjustment mechanism 10 that can change the position of the entire grounding float 5 up and down in a state that is substantially parallel to the working device B or close to it. In addition, the drive elevation control valve 9 of the working device B is linked to the change in the relative posture of the bending links 6a and 6b due to the vertical swing of the ground float 5.
This paddy field work machine is provided with a mechanism 13 for operating the float height adjusting mechanism 10, and is provided with a mechanism 23 for applying a biasing force to one side of the pivot connecting members 10a and 10b of the float height adjustment mechanism 10. Work equipment for paddy fields. The paddy field work machine according to claim 1, wherein the biasing mechanism 23 has a biasing force adjustment function.