JPH01181708A - Lifting controller for mobile agricultural machine - Google Patents

Abstract

PURPOSE:To prevent intense vertical vibration of the working machine by providing a control valve for increasing the rising motion which can increase the volume of the hydraulic fluid, when the machine body or the working machine detects a depression larger than a certain level. CONSTITUTION:When a depression larger than a certain level is detected in the body or the working machine, the valve for increasing the rising rate 5 is also controlled. In the circuit for controlling the lift hydraulic system, the automatic control valve for lifting motion 3 controls the lifting motion of the working machine, and simultaneously, the control valve for increasing the lifting motion 5 works to accelerate the rising rate of the working machine. The working level is rapidly restored to maintain the stabilized working operations.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a lift control device for mobile agricultural machines, and can be used not only for riding and walking rice transplanters, but also for combine harvesters and the like.

Problems to be Solved by the Prior Art and the Invention In a rice transplanter, when the vehicle body sinks due to changes in the tiller, etc., this sinking is detected by pressure detection from a float, etc., and the seedling planting device is controlled to rise relative to the vehicle body. , the seedling planting device is prevented from sinking into the soil, and the planting depth of the seedlings is always maintained constant.

However, when changes in the tiller, etc. are large and sudden, or when turning operations, etc., the series of interlocks from detection to lifting control is slow, and the vertical changes of the seedling planting device tend to be large. If the hydraulic pressure of the entire hydraulic control circuit is increased, the seedling planting device tends to swing violently up and down.

Means for Solving the Problems The present invention controls the automatic lift control valve (3) by detecting floating or sinking of the vehicle body (1) or the working device (2), thereby increasing the working device (2).
2) The lifting hydraulic control circuit (4), which automatically controls lifting and lowering so as to keep the working height of the part constant, has an automatic lifting hydraulic control circuit (4) that controls lifting control by detecting a depression of the vehicle body (1) or working device (2) above a certain level. Rise increase control valve that increases the hydraulic pressure and increases the rise speed (
5) A lifting control device for a mobile agricultural machine is configured.

Operation and effect of the invention By propelling the vehicle body (1) and the working device (2), the working device (2) performs work at a constant height or depth with respect to the soil surface. During the propulsion of the vehicle body (1), the vehicle body (1) or the working device (2) rises and falls depending on the depth and shallowness of the soil tillage. is detected, and the automatic lifting control valve (3) of the lifting hydraulic control circuit (4) is controlled so that the working device (2) section lifts the vehicle body (
1) is controlled to descend to prevent the working height from rising. Also, if the vehicle body (1) or work equipment M (2) sinks,
When this is detected, the working device (2) is controlled to rise, thereby preventing the working height from sinking. In this way, the car body (1)
Regardless of the vertical movement of the work device (2), the work device (2) is automatically maintained at a constant working height or depth by raising and lowering the work device (2), thereby maintaining stable work.

During work under such automatic control, if the vehicle body (1) or the working device (2) is detected to have caved in more than a certain level, the elevation increase control valve (5) is also controlled, so the elevation hydraulic control circuit (
In step 4), the automatic elevation control valve (3) controls the ascending side operation of the working device (2), and the hydraulic pressure for the ascending control by the ascending increase control valve (5) is increased. 2) can be increased to quickly return to and maintain a constant working height position, preventing the working device (2) from violently swinging up and down, and allowing stable work to be performed.

Embodiment In FIGS. 1 to 4, the vehicle body (1) has a front wheel (7) and a rear wheel (8) that are steered by a steering wheel (6), (9) The lower part constitutes a vehicle that is driven and propelled by an on-board engine (10), and behind this vehicle body (1) is an elevating link (12) that is raised and lowered by a hydraulic cylinder (11).
A working device (2) consisting of a seedling planting device is connected via the. Further, this work equipment M (2) is interlocked by a power take-off shaft (13) from the rear of the vehicle body (1).

The seedling planting device, which is the working device (2), has a flow (14) that slides on the soil surface on the lower side, a seedling tank (15) that accommodates and supplies seedlings, and a seedling tank (14) on the upper side. 15)
A planting device (16) for separating and transplanting the seedlings supplied from the seedlings is installed, and the seedlings are planted at a certain depth on the leveled soil surface using the flow method (14).

A part of the flow (14) is connected to the hydraulic cylinder (11).
The automatic lifting control valve (3) of the lifting hydraulic control circuit (4) is connected to the automatic lifting control valve (3) by an interlocking mechanism (17) such as a link or wire, and this flow (14) is the pivot (18) for the seedling planting device. By vertically swinging the float (10) over a certain area, the hydraulic cylinder (11
) is extended to raise the working device (2), and the downward movement of the float (14) shortens the hydraulic cylinder (11) to lower the working device (2), and the float (14)
The ground pressure against the soil surface is made constant, and the planting device (1
8) is controlled and interlocked to maintain a constant seedling planting depth.

In addition, the lift hydraulic pressure control circuit (4) includes a lift increase control valve (5).
) is provided and controls to increase the amount of oil supplied from the hydraulic pump (13) side to the hydraulic cylinder (11) via the automatic lift control valve (3).
Switching is controlled by the upward movement of 4) above a certain level. The automatic elevation control valve (3) is provided with a bushing arm (20), and this bushing arm (20) is connected to the elevation increase control valve (3).
By pressing the end face of 5), this lift increase control valve (5) opens and increases the amount of oil flowing to the rise side of the automatic lift control valve (3). (21) is a fixed quantity flow dividing valve, which connects the hydraulic pump (13) directly to the automatic lift control valve (3) (
A) and a circuit (B) which passes through the rise increase control valve (5). Flow through this circuit (A) CB)
(14) Swing detection area due to vertical swing (Al) (Bl)
If this corresponds to Set to .

In addition, the rotation speed (R) of the hydraulic pump (18) and these circuits (
A) The relationship between the flow rate (Q) flowing through CB) and the engine (
In the rotation range (E) of 10), C is constant (A2) in circuit (A), and pump (19) is constant in circuit (B).
It changes (B2) as the rotation changes.

The working device (2) is a hydraulic cylinder (1) of a hydraulic circuit (4).
Flow during 0 work that is raised and lowered by the expansion and contraction of 1)) (
When the vehicle (14) is sliding on the ground, the wheels (7) and (8) are supported near the plowing platform, so the vehicle body (1) changes vertically due to changes in the depth of the plowing platform or the hardness or softness of the soil. As a result, the working device (2) rises and falls. As a result, when the working device (2) floats above the soil surface, the float (1)
0 moves downward, the automatic lift control valve (3) is switched from the neutral position (a) to the lowering position (b), and the hydraulic cylinder (
In order to remove the hydraulic pressure of 11), this hydraulic cylinder (11)
is shortened and the link (12) is moved down to remove the working device (2).
) is lowered, the ground pressure of flow) (14) increases and the automatic lift control valve (3) returns to the neutral position (a), and conversely, the plowing platform becomes deeper and the working equipment (2) If it sinks too much, the flow (14) will be pushed up and the automatic lift control valve (
3) is switched from the neutral position M (a) to the raised position (c), the hydraulic cylinder (11) is extended, and the working part M (2)
is raised, the ground pressure of flow (14) becomes smaller, and the automatic lift control valve (3) also returns to the neutral position (a).

Due to this action, the working device (2) is maintained at a constant position on the soil surface, and the seedling planting depth by the planting device (1B) is maintained constant. Furthermore, the detection operation according to the automatic control flow (14) is performed in the detection area (AI), but when the tiller becomes extremely deep,
The float (14) is raised from the detection area (A1) to (B1). At this time, move from the neutral position (A) to the raised position (C).
The rise increase control valve (5) is moved to the neutral position (
(d) to the raised position (e). As a result, the hydraulic pressure that was being sent to the hydraulic cylinder (11) only from the circuit (A) is also added from the circuit (B), and the hydraulic cylinder (11) is rapidly extended. As a result, the working device (2) is rapidly raised to the proper position (flow) (1)
4) returns to its normal position, the automatic lift control valve (3) returns to the neutral position M (a), the rise increase control valve (5) returns to the neutral position (d), and the hydraulic circuit CB) is closed. .

In the embodiment shown in Fig. 5, a working device (2) is installed at the rear of the vehicle body (1).
This is a walk-behind rice transplanter that is directly connected or integrally provided, and the working part is maintained at a constant position by controlling the wheels (25) to move up and down relative to the vehicle body (1).

A transmission case (2) that supports a pair of left and right wheels (25) on a transmission shaft
B) is provided to be movable up and down around the wheel transmission shaft (27) with respect to the vehicle body (1), and this wheel transmission case (26)
It is raised and lowered by the expansion and contraction control of the hydraulic cylinder (11), and its operation is controlled by the vertical swinging of the flow (14) via the automatic lift control valve (3) and the lift increase control valve (5). When the float (10) moves upward, the wheel transmission case (28) is controlled to move downward, and the flow) (14)
When the wheel transmission case (28) moves downward, the wheel transmission case (28) is controlled to move upward to maintain a constant position of the rear working device (2) with respect to the soil surface.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a side view of a part of the operation, Fig. 3 is a graph showing changes in flow rate in the hydraulic circuit, and Fig. 4 is a side view. Figures 5-5 are side views of another embodiment. In the figure, (1) is the vehicle body, (2) is the working device, (3) is the automatic lift control valve, (4) is the lift hydraulic control circuit, and (5) is the lift increase control valve.

Claims (1)

[Claims] An elevation hydraulic control circuit that controls an automatic elevation control valve (3) based on detection of ups and downs of the vehicle body (1) or work equipment (2) to maintain automatic elevation control so as to keep the working height of the work equipment (2) constant. (4) is provided with a lift increase control valve (5) that increases the lift speed by increasing the hydraulic pressure for the lift control by detecting the depression of the vehicle body (1) or the working device (2) to a certain level or more. Elevation control device for mobile agricultural machinery.