JPH0767341B2 - Planting part elevation control device in rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a planting part elevation control device in a rice transplanter.

(Prior Art) In a conventional rice transplanter, a planting part elevation control device and a work speed changing device, for example, a height operation of an accelerator lever, a main gear shift operation, and a sub gear shift operation are independently operated.

(Problems to be solved by the invention) According to the above, in a field with water on the surface or a field with a soft surface, the resistance of mud in front of the sensor float increases as the working speed increases, and the rear fulcrum The sensor float that is supported by the will take an upright posture and be selfish.

For this reason, the hydraulic valve will be raised freely, and as a result, the planting section will work while floating above the rice field. As a result, the planted seedling has a disadvantage that it becomes a floating seedling.

In order to improve this, if the speed of the aircraft becomes faster, the raising and lowering sensitivity of the planting part raising and lowering control is sharpened, and if the speed is slow, the sensitivity is switched sensitively. It is known from Japanese Laid-Open Publication No. 59-169405.

According to the above, it is possible to solve the conventional drawback that work is performed with a tendency to float or sink due to shifting between high-speed work and low-speed work, and the work machine is lifted at both high-speed work and low-speed work speeds. Controlled.

However, since the biasing force of the spring is used for the ground load of the sensor float, there is a drawback that the spring will be damaged or the sensitivity will become dull due to long-term use, and the lifting movement of the float does not follow the working speed, and the sensitivity is also high. It has the disadvantage that it is unstable and cannot be adjusted as expected.

(Means for Solving the Problems) Therefore, the technical problem of the present invention is to provide a planting part lifting device in a rice transplanter that can withstand long-term use and has an immediate response to the lifting control of the planting part without floating seedlings. The technical means of the present invention to solve this technical problem is to rotate the planting depth lever with respect to the transmission case at the intermediate fulcrum of the rear link where the rear part is pivotally supported by the sensor float. It is configured so that it can be fixed, and the other end of the rear link is connected to the inner wire of the sensor by a reference pin through a swingable lever, and the reference pin moves up and down in the slit groove of the link provided in the sensor float. The outer wire of the inner wire is an outer bracket, and the outer wire is provided on the upper end of the link. The sensor wire includes the inner wire and the outer wire. The other end of the sensor wire is attached to a sensor wire outer bracket of a sensitivity adjusting device, and the sensor wire outer bracket is connected to a sensitivity lever that can be rocked and adjusted in a guide groove by a spring through an interlocking mechanism. The outer bracket is further attached with a sensitivity changing wire which is interlockingly connected with the work speed changing device, so that when the work speed becomes faster, the lift sensitivity becomes dull and the work speed becomes slower. The planting part elevation control device is characterized in that it is interlockingly connected so that the elevation sensitivity becomes sensitive.

(Effect of the Invention) According to this technical means, even if the working speed increases and the resistance of the muddy water on the front surface of the sensor float increases, the lifting sensitivity becomes dull, so that the sensor float is in a slightly raised posture. However, the hydraulic valve does not go up and the planting part does not go up. Therefore, the floating planting area does not float near the planting position of the float, and floating seedlings are not generated.

On the other hand, if the working speed becomes slower, the vertical sensitivity becomes more sensitive. Therefore, in the normal state, the work is performed while adjusting the planting part to an appropriate position, so that the planting can be carried out accurately.

Then, the sensitivity lever and the reference pin operated by the planting depth lever of the planting depth adjusting device are linked by the sensor wire via the sensor wire bracket, so the sensitivity is adjusted by moving the outer wire. The feature is that it is possible to control the elevation of the planting part and can withstand long-term use. However, the sensitivity can be adjusted as desired, and there is no instability.

(Example) Hereinafter, the Example shown in drawing is described.

In FIG. 4, (1) shows a traveling vehicle body, and front and rear wheels (3) and rear wheels (5) are provided in front of and behind the vehicle body frame (2) of the traveling vehicle body.
And the rear wheel (5) is attached via the chain case (4).

A vehicle seat (6) and a steering wheel (7) are provided on the upper surface of the body frame (2), and the wheels (3) and (5) are driven by the engine on the body frame (2) to travel.

(9) shows a planting device which is attached to the rear part of the traveling vehicle body (1) via a parallel link mechanism (10) so as to be vertically movable, and the planting device (9) is a transmission case (11), a rotary case. (13) (13) (13), a sensor float (14) arranged on the lower surface of the transmission case, and a seedling stand (16) whose upper end is inclined so as to approach the traveling vehicle body (1), and each rotary case Each of them is provided with a planting claw case (17), and between the traveling vehicle body (1) and the parallel link mechanism (10) for raising and lowering the planting device (9) with respect to the field scene. A single-acting hydraulic cylinder (18) is provided.

The hydraulic cylinder (18) is connected to the operation valve (4
4) and the operating valve (44) moves up and down in conjunction with the planting depth lever (21) via the outer receiver of the link (19) shown in FIG. 5 attached to the front part of the sensor float (14). Inner wire (29) connected to reference pin (28)
It is controlled by.

Therefore, if the front part of the sensor float (14) rises with respect to the planting part, the lever (33), which will be described later, is pulled to the operation valve side through the inner wire (29) and the operation valve (44)
The hydraulic cylinder (18) raises the planting part. The lifting reference pin (28) moves up and down in the slit groove (27) of the link (19).

From the above, when the planting depth lever is moved, the pin (28) moves in the same direction as the moving amount of the fulcrum (22) at the rear of the float.

Therefore, even if the planting depth is changed, the angle of the float at which the planting part moves up and down does not change. Therefore, even if the planting depth is changed, the proper planting depth is maintained.

In other words, the lifting reference pin position is also changed so that the planting part raises the float at a constant angle no matter which planting depth is selected.

Specifically, the rear link (20) having the intermediate portion supported (21 ′) by the transmission case has one end of the sensor float (1).
4) is pivotally supported behind (22) and the other end has an intermediate link (6
3) and the inner wire of the sensor through the lever (23).

Further, the planting depth lever (21) is provided so as to be rotatable and fixed around the support (21 ') portion.

The lever (23) is a fulcrum (26) provided on the transmission case (11).
Swing around. The lever (23) is a fulcrum (26).
The pin (28) at its one end moves up and down in the slit groove (27) of the link (19). An inner wire (29) is connected to the pin (28).

The outer wire (31), that is, the outer bracket of the sensor float (30), is provided on the upper end of the link (19).

The sensitivity adjustment part (B) is provided in the planting part elevation control mechanism (A) configured to detect the vertical movement of the sensor float as described above and maintain the planting part at a constant height. The part (B) and the work speed changing device (C) are interlocked and connected. That is, as shown in FIG. 1, the other end of the sensor wire (30) is attached to the sensor wire outer bracket (32) of the sensitivity adjusting device (B).

Reference numeral (33) is an operation lever, that is, a sensitivity lever, which can swing back and forth around a pivot (35) with respect to the rod (34) as shown in FIG. 2, and a spring (36) shown in FIG. The guide groove (62) is supported at the locked position.

The rod (34) is mounted on the partition walls (38) (39) of the sensitivity adjustment case (37), and the rod (42) is further mounted on the support plates (40) (41) fixed to the rod. The sensor wire outer bracket (32) is attached to the.

The sensor wire (43) further extended from the sensor wire outer bracket (32) is the upper end of the lever (45) that operates the operation valve (44) that switches the oil passage to the hydraulic cylinder (18) in the link mechanism (10). The lever (45) swings around the fulcrum (46).

The inner wires of the sensitivity change wires (47) and (48) are attached to the sensor wire outer bracket (32) so as to face each other, and the outer bracket (4
9) (50) is attached to the rod (42).

This outer bracket (49) (50) is V
It is attached to the rod (42) in a V shape.

The sensitivity changing wires (47) and (48) are connected to each other so that the inner wires are opposite to each other with respect to the accelerator lever (51), and (52) and (53) denote outer brackets thereof.
Then, the relationship between the accelerator wire end as the speed changing device (C) and the sensitivity changing wire end is as follows.

As shown in FIG. 3, the accelerator lever (51) is attached to the handle post (54) and extends from the bonnet (57) to the outside, and the accelerator lever (51) mounting bracket (55) for the handle post (54). An arm is provided in a protruding manner, and an accelerator wire end (60) and a sensitivity changing wire end (61) are attached to a bar (59) at the tip of the stay (56). Reference numeral (64) shown in FIG. 1 indicates an accelerator wire.

The present invention is configured as described above. When the sensitivity lever (33) is driven, the sensitivity in the X direction is low and the sensitivity in the Y direction is low. Therefore, the sensor wire may be rotated in the X or Y direction. Loosen or pull the inner wire of (43). Therefore, the lever (45) swings around the fulcrum (46) to operate the link lifting / lowering operation valve (44) to switch the oil passage and change the sensitivity of the hydraulic lifting device.

Then, the output amount of the sensitivity changing wires (47) (48) with respect to the outer wires is also adjusted, and the accelerator lever (51) is pulled or loosened in the WZ direction. The speed is slow in the W direction and fast in the Z direction.

With the above operation, the amount of the inner wire of the sensor wire (30) changed, and the tip of the float is forcibly moved up and down.

Therefore, when the accelerator lever (51) is rotated in the faster direction, that is, in the Z direction, the inner wire on the sensitivity changing wire (48) side is pulled, and the inner wire on the sensitivity changing wire (47) side loosens.

Therefore, the support plates (40) (41) rotate in the Y direction, and the sensor wire (43) loosens, so that the up-and-down sensitivity becomes dull.
Therefore, even if the work speed increases, it works to slow down the vertical sensitivity, so even if the sensor float may take a slightly upward posture, the planting part will not rise and it will not float above the field scene. .

On the other hand, when the accelerator lever is rotated in the W direction, the work speed becomes slower, the inner wire on the side of the sensitivity changing wire (48) becomes loose, and the inner wire on the side of the sensitivity changing wire (47) is pulled, so that the support plate (40) (41) ) Rotates in the X direction and pulls the sensor wire (43) to make the up-and-down sensitivity sensitive, so that the operator can work while adjusting the planting part to an appropriate position in a normal state.

From the above, according to the present invention, the planting part elevation control mechanism has good responsiveness, and the planting work can be performed accurately.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the device of the present invention. FIG. 2 (a) and (b) are rear views of the sensitivity adjusting section and plan views of the guide groove. FIG. 3 is a rear view of the speed adjusting section. Is an overall view of the rice transplanter. Fig. 5 is a partial view of the rice transplanter. Fig. 6 is a plan view of the main part. (A) …… Planting part elevation control mechanism (B) …… Sensitivity adjuster (C) …… Speed change device

Claims (1)

[Claims] 1. A planting depth lever can be pivotally fixed to a transmission case at an intermediate fulcrum of a rear link whose rear part is pivotally supported by a sensor float, and the other end of the rear link is swingable. The inner wire of the sensor is connected through a lever with a reference pin, and the reference pin is configured to move up and down in a slit groove of a link provided on the sensor float, and the outer wire of the inner wire is an outer bracket. The upper end of the sensor wire composed of the inner wire and the outer wire is attached to the other end of the sensor wire outer bracket of the sensitivity adjusting device, and the sensor wire outer bracket is locked by a spring in the guide groove. The sensor wire is connected to a flexible sensitivity lever via an interlocking mechanism. The water bracket is further attached with a sensitivity changing wire that is interlockingly connected with the work speed changing device, so that when the work speed becomes faster, the lift sensitivity becomes dull and the work speed becomes slower. The planting part elevation control device is characterized in that it is linked so that the elevation sensitivity becomes sensitive.