JPH048730Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention provides a propulsion wheel that can be adjusted up and down, and also raises and lowers the propulsion wheel with respect to the aircraft body based on the detection result of the ground pressure of a sensor float. The present invention relates to a walk-behind rice transplanter equipped with an automatic lift control means for maintaining the ground pressure of the sensor float at a set pressure.

[Conventional technology]

Generally, in such walk-behind rice transplanters, when the ground pressure detected by the sensor float is higher than the set pressure, it is determined that the tiller has become deeper and the wheels are lowered, and the ground pressure detected by the sensor float is lowered. If the pressure is lower than the set pressure, it is determined that the plowing platform has become shallow, and the wheels are raised to maintain an automatic elevation control means so that the height of the machine body relative to the field surface remains constant.

Conventionally, even if a large ground pressure is applied to a sensor float, the wheels are lowered until the detected ground pressure of the sensor float is maintained at a set pressure.

[Problem that the invention attempts to solve]

Therefore, for example, when changing direction at the edge of a ridge, if the sensor float rides on the ridge,
As a result of the wheel lowering control being activated and the aircraft being lifted significantly and the aircraft continuing to advance with the wheel ground load increasing, there was a risk that the ridges would be destroyed by the wheels.

An object of the present invention is to prevent the above-mentioned problems when a large ground pressure is applied to the sensor float.

[Means for solving problems]

A characteristic configuration of the present invention is that when the sensor float senses a ground pressure equal to or higher than a second set pressure that is larger than the set pressure during automatic elevation control, means is provided for forcibly raising the propulsion wheel, Its action and effects are as follows.

[Effect]

In other words, when the sensor float senses a ground pressure equal to or higher than the second set pressure, which is higher than the set pressure during automatic lift control, it is determined that the float has run aground on a ridge, etc., and the wheels are forcibly raised, removing most of the aircraft's load. is supported by the ground leveling float and the wheel ground pressure decreases,
The aircraft stops due to the loss of propulsion.

[Effect of the invention] Therefore, when the aircraft changes direction at the edge of a ridge, if the sensor float runs aground on the ridge, it can stop the aircraft from moving forward, allowing work to be carried out safely without destroying the ridge. I am now able to do this.

〔Example〕

As shown in FIG. 4, a pair of left and right propulsion wheels 1,
1. One sensor float 4 is attached to the lower part of the fuselage which has an engine 2, a control handle 3, etc., and two seedling planting arms 5 are attached to the rear of the fuselage, and each of the seedling planting arms 5 is attached to the A walk-behind rice transplanter for planting in two rows is constructed by providing a seedling feeding device in which two pine-shaped seedlings, which are supplied separately, are placed side by side on a seedling platform 6.

To explain the structure for raising and lowering the propulsion wheels 1, 1, as shown in FIG.
A piston rod 8 of a hydraulic cylinder 8 is pivotally supported to be vertically swingable around a horizontal axis P, and is disposed at the center in the front-rear direction of the fuselage and at the center position in the left-right direction of the fuselage.
A swinging link 9 is attached to the tip of the swinging link 9 so as to be rotatable around the vertical axis Q, and swinging operation arms 10, 10 have both left and right ends of the swinging link 9 protruding from the transmission cases 7, 7, respectively. The transmission cases 7, 7 are connected to each other via rods 11, 11, and the hydraulic cylinder 8 is extended and contracted to move the swing link 9 back and forth, thereby swinging the transmission cases 7, 7 integrally on the left and right sides. 1, 1 to raise and lower it relative to the aircraft, and
By swinging around the vertical axis Q of the swing link 9, both wheels 1, 1 can be moved vertically against each other, so that even if the tiller is uneven, the machine body can be maintained at a constant height with respect to the field surface. It is set as.

In the figure, reference numeral 12 denotes a buffer spring provided between the receiving member 13 attached to the piston rod 8a and the swing link 9.

The operation valve 14 of the hydraulic cylinder 8 is switched based on the detection result of the ground pressure of the sensor float 4, and the specific configuration thereof will be described below.

As shown in FIGS. 1 and 2, the rear end side of the sensor float 4 is pivotally supported around the horizontal axis R, and is interlocked and connected to a rotary valve 14 as an operating valve of the hydraulic cylinder 8. A spring 1 biases one end of the bell crank 15 that has been moved toward the shortening side.
6, and the other end is connected to the front end of the sensor float 4 via a rod 19,
When a ground pressure equal to or higher than the set pressure set by adjusting the spring 16 is applied to the sensor float 4, the bell crank 15 is swung clockwise to move the rotary valve 14 to a position where the hydraulic cylinder 8 is extended. D, the wheels 1, 1 are lowered, and when a ground pressure smaller than the set pressure is applied to the sensor float 4, the bell crank 15 swings counterclockwise to move the rotary valve 14 to the hydraulic cylinder 8. is switched to the position U where the shortening operation is performed, and the wheels 1,
1 is raised, and the wheels 1, 1 are automatically controlled to raise and lower in response to variations in the depth of the plow, thereby maintaining the machine body at a set level with respect to the field surface.

When the sensor float 4 senses a ground pressure equal to or higher than a second set pressure that is higher than the set pressure during automatic elevation control, the propulsion wheels 1, 1 are forced to rise; Explain the means.

A stopper 17 is provided to prevent the bell crank 15 from swinging further clockwise than the wheel lowered position D, and a spring 18 which is initially compressed and deformed is applied to the stopper 17. Therefore, during normal automatic control in the field, the bell crank 1 is adjusted according to ground pressure fluctuations of the sensor float 4.
5 operates between position U for raising the wheel and position D for lowering the wheel, and the sensor float 4 rides on the ridge at the edge of the ridge, so that the ground pressure is higher than the standard set pressure. When the height increases above this level, the bell crank 15 is further swung clockwise against the spring 18, and operates to the second wheel raising position U' where the hydraulic cylinder 8 is operated for shortening, and the wheels 1, 1 are forcibly raised. The machine lifts up from the plowing platform and stops moving forward.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind rice transplanter according to the present invention; Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a schematic diagram showing the specific configuration of the automatic lifting and lowering control means for wheels, and Fig. 3 is an enlarged view of the main parts. The plan view and FIG. 4 are side views of the walking rice transplanter. 1, 1...propulsion wheel, 4...sensor float.

Claims (1)

[Scope of utility model registration request] In addition to providing propulsion wheels 1, 1 that can be adjusted up and down, the propulsion wheels 1, 1 are raised and lowered relative to the aircraft body based on the detection result of the ground pressure of the sensor float 4, and the ground pressure of the sensor float 4 is set to a set pressure. In the walk-behind rice transplanter, the rice transplanter is equipped with an automatic elevation control means for maintaining the propulsion wheels at a position where the propulsion wheel A walk-behind rice transplanter equipped with a means for forcibly raising 1,1.