JPH082203B2 - Lifting and connecting device for work equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting and lowering connecting device for mounting a rice transplanter, a rotary working machine, and the like on a passenger vehicle represented by a tractor so as to be able to move up and down.

Prior Art Conventionally, as disclosed in JP-A-55-34010,
Among links for mounting rice transplanters on a passenger car body, there was a structure in which the upper link was formed of a spring material to have an elastic function to move up and down.

Problems to be Solved by the Invention In the related art, it has been impossible to hold the working machine by providing an elastic function in the left-right direction. For this reason, if the handle is turned slightly to the left or right during the work, the work machine immediately shakes laterally and the work row locally fluctuates.

Means for Solving Problems The present invention is directed to solve the above-mentioned problems by using a passenger vehicle body 1
In the working machine mounting device in which the working machine 28 is connected to be movable up and down via the upper link 22 and the lower links 23, 23, and one link side is vertically moved by the hydraulic device 27, the upper link 22 or the lower link 23, 23 one side is composed of a link which is elastically bendable in the vertical direction, the other side is a link which is elastically bendable in the left and right directions, and the front and rear connecting parts of the link which are vertically bendable A lifting / lowering connecting device for a working machine provided with a floating portion (a).

According to the present invention, the link side absorbs the overload in the vertical direction and the overload in the left and right directions of the working machine, and it is possible to eliminate sudden vertical and horizontal vibrations of the working machine.

Example 1 is a passenger car body, in which a pair of left and right driven steering front wheels are used.
Aircraft equipped with 2, 2 and a pair of left and right driving rear wheels 3, 3 on the lower side
A control seat 4 is provided on the upper front part of the front and rear of 1a, and a control handle 5 is mounted on the upper part of a steering post 6 on the front side.
The control device is a power steering, and a hydraulic power steering unit 9 is provided between the support shaft 7 of the steering wheel itself and the steering drive shaft 8 that substantially changes the direction of the front wheels. The power steering unit 9 is well known, and is provided with a kind of torque converter so that the steering drive shaft 8 is forcibly rotated by the same angle by hydraulic pressure in accordance with the rotation cutting angle of the support shaft 7. There is. Further, the equipment 9a of the power steering unit 9 is integrally provided with a joint shaft 10 capable of absorbing backlash for correcting misalignment, and a universal joint 11 is attached to the tip side thereof to be interlocked with the steering shaft 12. . In the figure, 13 and 14 are connecting pins, 15 is a bearing, and 16 is a cover.

Reference numeral 17 denotes an engine, which is provided below the seat 4 with an engine cover. 18 is a front mission case and 19 is a rear mission case.

Reference numeral 20 denotes a link support post, which has a rear part of the fuselage 1a opposite to the left and right, and upper parts thereof are connected to each other to form a gate-shaped rear view.

Reference numeral 21 is an elevating link device, and a single upper link 22 and a pair of left and right lower links 23, 23 are provided at the base side of the link support post 2 together.
It is connected to 0 with horizontal pins 24 and 25, and this rear end is vertically linked.
The rear link support on the upper link side is bent forward and downward at 26, and this is connected to the piston 27a of the hydraulic device 27 attached to the machine body 1a in the front-rear direction on the lower side of the engine 17. There is.

The upper link 22 is formed of a thin leaf spring in the up-down direction so that it can be bent up and down, and the connecting portion between the link 22 and the vertical link 26 at the rear end is in the left-right direction. A floating portion (a) is formed that can move freely by a predetermined amount.

Further, the lower links 23, 23 are made of leaf springs that are thin in the left-right direction, and have a structure capable of bending left and right.

28 is a rice transplanter, which is an example of a working machine, and is attached to the vertical link 26 so as to be freely rollable.

The rice transplanter 28 is mounted on the front side of the L-shaped transmission case 29 which also functions as a frame so as to reciprocate left and right above the front side of the transmission case 29 with the rear side inclined downward, and the planting tool 31 on the rear end side. It is configured so that it can be attached and multiple lines can be planted at once. Further, on the lower side of the transmission case 29, a center float 32 and a side float 33 arranged at a predetermined interval on the left and right are provided, and a seedling plant in a side view at a certain distance front side from the rear end of each float. The transmission case 29 is located near the attachment position.
It is attached by a lateral pivot pin 34 via a rotation adjusting lever 34 attached to the side. Then, among these floats, the pressure-sensitive sensors S ₁ and S ₂ for detecting the ground pressure at a position near the seedling planting position in a side view of the ground contact surface of the center float 32 and at a position apart from this by a predetermined distance rearward. The switching valve 35 of the hydraulic device 27 is switched by a signal obtained by comparing the pressure-sensitive sensors S ₁ and S ₂ , and the rice transplanter 28 is automatically controlled to move up and down.

This lifting control mechanism will be described in detail with reference to an embodiment. As shown in the electric circuit diagram of FIG. 6, the comparison circuit 36 compares the voltages from the pressure-sensitive sensors S ₁ and S ₂ and the difference between them. The pressure voltage is appropriately amplified by the amplifier 37, and this is calculated with the voltage from the reference voltage circuit 38 by the comparison calculation circuit 39 to output an output signal,
The electromagnetic switching valve 35 of the hydraulic device 27 is controlled, and when the pressure sensitive of the pressure sensitive sensor S ₁ is higher than the signal voltage from the reference voltage transmitter 40 and conversely low. . That is, pressure-sensitive sensor S ₁ for detecting the pressure-sensitive relative to the pressure sensor S ₂ of the detection when the pressure is higher detected above a predetermined and pressure sensitive sensors S ₁ planting if higher than the reference value unit 28
Is raised, and in the opposite case, it is lowered. The pressure sensor S ₁ and the pressure sensor S ₂ can be adjusted by the sensitivity adjusters 41 and 42, respectively.

Explaining the operation of this embodiment, during the rice transplanting work, when the ground pressure received by the center float 32 becomes large and the front side becomes slightly floating, the rice transplanter 28 is raised, and conversely when the front side becomes slightly downward, the rice transplanter 28 becomes The electromagnetic switching valve 35 is switched so as to descend, and the ground pressure is always appropriate, and the float 32 is propelled while being controlled so that the angle of attack posture of the float 32 is constant.

Then, during this lifting control, the upper link 22 is lifted and lowered by the hydraulic device 27 while flexing vertically, so that hunting during control is small and smooth control is performed. Also, when operating the steering wheel 5 to change the direction, the lower links 23, 2
3 is bent and the planting row by the rice transplanter 28 does not suddenly bend, and the row of planting rows is changed in a gentle state.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a side view with a part of the main part cut away, and FIG. A partially cutaway rear view, FIG. 5 is a hydraulic circuit diagram, and FIG. 6 is an electric circuit diagram. In the figure, reference numeral 1 is a vehicle body, 22 is an upper link, 23 is a lower link, 27 is a hydraulic device, 28 is a working machine (rice transplanter), and (a) is a floating part.

Claims (1)

[Claims] 1. The upper link 22 and the lower links 23, 23 on the passenger car body 1.
In the working machine mounting device, in which the working machine 28 is connected so as to be able to move up and down, and one link side is vertically moved by the hydraulic device 27, one side of the upper link 22 or the lower links 23, 23 is elastically moved in the vertical direction. Work with a flexible link, the other side being elastically flexible in the left-right direction, and the floating part (a) provided at the front and rear one-side coupling part of the flexible link Lifting machine connecting device.