JPS6335202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevation control device for a flooded direct seeding machine.

In the submerged direct sowing machine, a float equipped with a groove cutting plate is attached to the machine frame via a parallel link mechanism so that it can be raised and lowered, and a sowing unit such as a feeding device for sowing seeds to the rear side of the groove cutting plate is attached to the machine frame. There is one in which the machine frame is mounted on a moving machine such as a tractor so that it can be raised and lowered by a hydraulic system. With this type of machine, the hydraulic system lowers the machine frame to a predetermined height and suspends it during work, so the height of the sowing section remains constant.
The float constantly moves up and down according to the undulations of the field, so when the float passes over wheel marks, etc., the float and the groove cutting plate lower, and the gap between the seeding port and the groove cutting plate in the seeding section widens. It would be too much,
It was not possible to sow seeds under ideal conditions.

The present invention is intended to solve these conventional problems, and its features are as follows:
A float equipped with a groove cutting plate is attached to the machine frame using a parallel link mechanism so that it can be raised and lowered, and a sowing section for sowing seeds is provided on the rear side of the groove cutting plate on the machine frame, and the machine frame is connected to the moving machine using a hydraulic system. The submerged direct seeding machine is mounted so that it can be raised and lowered by a control means that detects the vertical movement of the float and moves the hydraulic device up and down in conjunction with the detection operation so that the parallel link mechanism is in a substantially horizontal state. It is at the point.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 1, 1 is a tractor body as a moving body, and 2 is a rear wheel. Reference numeral 3 denotes a hydraulic device for lifting and lowering the working machine, and has a pair of left and right lift arms 4. 5 is the driver's seat. 6 is a three-point link mechanism, consisting of a top link 7 and a lower link 8,
The lower link 8 is connected to the lift arm 4 via a lift rod 9, and this three-point linkage mechanism 6 connects the submerged direct seeding machine 1 to the rear of the tractor body 1.
0 is attached so that it can be raised and lowered. The flooded direct seeding machine 10 has a horizontal rod 12 of a machine frame 11 connected to a three-point linkage mechanism 6.
, a hopper 13, a feeding device 14, a float 1
5. It is made up of a plurality of sets of seeding devices each consisting of a groove cutting plate 16 and a soil covering plate 17 installed in the horizontal direction.
That is, a plurality of sets of mounting brackets 18 are fixed to the horizontal rod 12, and the feeding device 14 is mounted to the rear end of the mounting bracket 18, and the hopper 13 is mounted via a support rod 19. The feeding device 14 is equipped with a feeding roll 21 inside a feeding box 20, and is configured to feed out the seeds (hulls) in the hopper 13 in fixed quantities into the seeding cylinder 22 by rotating the feeding roll 21 in the direction of the arrow. has been done. The float 15 is attached to a fixed member 25 of the mounting bracket 18 via a movable bracket 23 and a parallel link mechanism 24.
Among the multiple sets of seeding devices in the lateral direction, those other than the center (in the case of a symmetrical set) are interposed between the mounting bracket 18 and the parallel link mechanism 24. It is biased downward by a lowering mechanism. The groove plate 16 is disposed in a notch 26 formed at the center of the rear part of the float 15, and is connected to the float 15 via a rod 27, a cylinder 28, etc.
It is attached to a movable bracket 23 so as to be vertically adjustable. The grooved plate 16 has a substantially V-shape in plan view made by joining two plates on the front edge side, and is configured so that seeds fall into the groove from the lower seeding port of the seeding cylinder 22. Covering plate 17 is float 1
connected to a mounting member 29 fixed to the rear part of 5;
It is urged downward by the bullet lowering mechanism 30.

Reference numeral 31 denotes a control box attached to one side of the hydraulic system 3, and a control valve 32 is provided inside this box as shown in FIGS. 2 and 3. The control valve 32 is a valve body 33
The projecting end of the spool 34 is connected to the center of the link 36 via a pin 35 or the like. The link 36 is inserted into and supported by the free ends of the pair of levers 37 and 38 via the spherical portions at both ends.
Further, the levers 37 and 38 are fixed to the respective inner ends of support shafts 39 and 40 inserted through both side walls of the control box 31. An operating lever 41 is fixed to the outer end of the support shaft 39, and a detection lever 42 is fixed to the outer end of the support shaft 40. It is connected to a parallel link mechanism 24 of. and,
The parallel link mechanism 24 and the control valve 32 are such that when the parallel link mechanism 24 is in a substantially horizontal state, the control valve 32 is neutral, and when the parallel link mechanism 24 is tilted backward at a certain angle, the control valve 32 is in a downward position, and vice versa. The control valves 32 are interlocked and connected so that when the parallel link mechanism 24 is tilted forward upward at a certain angle, the control valves 32 are respectively switched upward. Note that 43 is a spring for lowering the bullet.

The control valve 32 is constructed as shown in FIG. 4, and the valve body 33 has an input port 45 connected to a hydraulic pump 44, an output port 46 connected to the hydraulic device 3, and drain ports 48, 49 connected to a tank 47. are formed respectively.

Next, the effect will be explained. When direct seeding is carried out by flooding in a paddy field, the entire direct seeding machine 10 is lowered, and the machine frame 11 is suspended by the hydraulic device 3 so that the parallel link mechanism 24 is approximately horizontal with the float 15 in contact with the ground.
In this state, the vehicle travels while driving the feed roll 21 of the feed device 14 in the direction of the arrow by the tractor power. Then, the float 15 slides while following the ground, and the groove cutting plate 16 creates a seeding groove of a predetermined depth.
Seeds fed out from the hopper 13 by the feeding device 14 are sown there. After sowing, soil cover plate 1
In step 7, cover the seeding furrow with soil.

When the parallel link mechanism 24 is in a substantially parallel state, the control valve 32 is neutral as shown in FIG. 4, and oil from the hydraulic pump 44 is returned from the input port 45 to the drain port 48. Therefore, when the float 15 descends due to the undulations of the ground, the parallel link mechanism 24 tilts backward and downward, so the inner 44 of the push-pull wire 43 is pulled, and the detection lever 42 moves around the support shaft 40 in the direction of arrow a. and rotate. As a result, the lever 38 also rotates by the same angle in the direction of arrow a, so that the link 36
It operates in the direction of the arrow b using the tip end side of the control valve 32 as a fulcrum, and pulls out the spool 34 of the control valve 32 in the direction of the arrow c. When the inclination angle of the parallel link mechanism 24 reaches a certain angle at this time, the control valve 32 is switched to the downward direction as shown in FIG. The machine frame 11 as a whole begins to descend, and the parallel link mechanism 24 returns to a substantially horizontal state. Therefore, since the distance between the groove cutting plate 16 and the seeding port at the lower end of the seeding tube 22 of the feeding device 21 can be kept substantially constant, the seeds fall into the groove cutting plate 16 from a position at a constant height. This allows seeding work to be carried out under ideal conditions. In addition, if the field is tilted from side to side, the machine frame 11 is raised and lowered by the movement of the parallel link mechanism 24 in the center.
Since the parallel link mechanism 24 in the center operates to maintain a substantially horizontal position, the amount of movement of each parallel link mechanism 24 of the seeding devices on both sides can be reduced. It is possible to reliably cause the float 15 and the groove cutting plate 16 to follow the movement along the line, and the followability is good.

When the parallel link mechanism 24 is tilted rearward and upward, the control valve 32 is switched to the upward direction as shown in FIG. The device 3 lifts the machine frame 11.

It goes without saying that the control valve 32 is also switched when the operating lever 41 is operated from the neutral position N to the raised position U to the lowered position D.

In the embodiment, a multi-strip type is described, but a single-strip type can be similarly implemented. Further, the control means may be constituted by the link 36, the levers 38, 42, the push-pull wire 43, etc., or may be constituted electrically.

In the present invention, the vertical movement of the float is detected, and in conjunction with this, the hydraulic system is moved up and down so that the parallel link mechanism is in a substantially horizontal state.The machine frame follows the vertical movement of the float and moves up and down. This allows the distance between the groove cutting board and the seeding section to be kept constant at all times, allowing seeding work to be carried out in ideal conditions. Furthermore, even when the amount of movement of the parallel link mechanism is reduced, the float follows the ground better, which is very effective for multiple types.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view, FIG. 2 is a cross-sectional front view of the control section, and FIG.
The figure is a configuration diagram of the control section, and FIGS. 4 to 6 are sectional views of the control valve. 1...Tractor body, 3...Hydraulic system, 6...
Three-point linkage mechanism, 10...Flooded direct seeding machine, 11...
Machine frame, 15... Float, 16... Grooving plate, 24
... Parallel link mechanism, 32 ... Control valve, 43 ...
push pull wire.

Claims (1)

[Claims] 1. A float equipped with a groove cutting plate is attached to the machine frame using a parallel link mechanism so that it can be raised and lowered, and a sowing section for sowing seeds is provided on the rear side of the groove cutting plate on the machine frame, and the machine frame is hydraulically connected to the moving machine body. In the flooded direct seeding machine, which is mounted so that it can be raised and lowered by a device, a control means that detects the vertical movement of the float and moves the hydraulic device up and down in conjunction with the detection operation so that the parallel link mechanism is in a substantially horizontal state. An elevation control device for a flooded direct seeding machine, characterized by the following: