JPS5947571B2 - Wheel height adjustment device for rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a planting section to a machine body equipped with wheels that are raised and lowered by a hydraulic cylinder, and a control valve of the hydraulic cylinder is linked to a ground float that is movable up and down. An automobile wheel elevation control mechanism is provided to control the elevation of the wheels in a direction opposite to the float displacement direction based on the vertical displacement of the float relative to the machine body, so that the machine body can always be kept at a predetermined position relative to the rice field regardless of changes in the depth of the tiller. The control valve can be configured so that it can be artificially switched to the lowering side of the wheels by operating a lever, so that when changing the direction of the aircraft at the edge of a ridge, the control valve Hold the aircraft by descending
The present invention also relates to a wheel height adjustment device for a rice transplanter that allows the machine to turn and maneuver with little resistance in a state where there is little mud pushing by the float.

Conventionally, rice transplanters with the above configuration have been configured so that when the wheels are manually lowered using the control lever, the wheels descend to the lowest limit, making the machine unnecessarily large in fields with shallow tillers. As a result, the stability of the aircraft decreased, making it difficult to perform aircraft turning maneuvers, and it took time to lower the aircraft after changing direction, resulting in a decrease in work efficiency.

In addition, if you operate the lever to stop the wheels descending depending on the lifting condition of the aircraft, it is necessary to perform the operation to stop the wheels descending in conjunction with the aircraft turning maneuver and other operations, and even an expert can do this. It was quite difficult to perform these operations reliably and quickly.

The present invention has been made with attention to such points, and the first invention is to reliably lift the machine body by a predetermined amount from the field surface regardless of the depth of the plow when changing the direction of the machine at the edge of the field. The object of the present invention is to enable stable and safe turning maneuvers, and the second invention is to ensure that the constant lowering operation of the wheels can be carried out reliably and well without mechanical strain. It is intended to.

The first aspect of the present invention is characterized in that, in conjunction with the operation of the operating lever for switching the control valve to the wheel lowering side, the wheels are lowered by a certain amount from the wheel position at the time the operating lever was operated. The present invention is configured to activate a wheel constant lowering mechanism that automatically stops the wheel lowering operation at a certain position.

According to the characteristic configuration described in item 1, the following effects are achieved.

In other words, if you operate the control lever to the wheel lowering side when you reach the edge of the ridge after finishing one stroke of planting with the automatic wheel elevation control, the automatic wheel elevation control will keep the rice planted on the rice field until just before operation. The machine is maintained at a predetermined level by the constant lowering of the wheels in conjunction with the operation of the fixed wheel lowering mechanism. Now, the aircraft can now perform stable and safe turning maneuvers with the aircraft always in the correct lifting position.

In addition, the lowering of the machine after turning is completed in a short time, and the transition to the next process of planting can be carried out quickly, thereby improving work efficiency.

In particular, as shown in the following embodiment, the operating lever for switching the control valve and starting the wheel quantitative lowering mechanism is also used as the operating lever for the planting clutch, and the operating lever is switched to the wheel lowering side. If you disengage the partial clutch during planting, operations from the end of the -stroke planting run to lifting the aircraft can be performed extremely easily with a single lever operation, improving operability. Second, it is effective.

Further, the feature of the second invention is that the wheel quantitative lowering mechanism is configured to operate the control valve when the wheel has lowered by a certain amount from the wheel position at the time when the control valve is switched to the wheel lowering position by the operation lever. The structure is such that the wheels are automatically forcibly returned from the lowered position to the neutral position.

According to the characteristic configuration described in item 1, after the wheels have been lowered in a fixed amount, the pressure oil in the hydraulic cylinder for lifting and lowering the wheels is returned to the tank via the control valve in the neutral position. There is no mechanical or hydraulic stress that occurs when lowering a fixed amount by forcing a stopper at a certain position and relieving pressure oil.
This makes it possible to reliably and accurately lower the wheels over a long period of time.

Also, since the pressure oil is not discharged in relief after the wheels are lowered a certain amount,
There is no rise in hydraulic oil temperature due to relief operation, and it is possible to avoid adverse thermal effects on oil seals and other related equipment due to a rise in oil temperature, and also prevent premature deterioration of the hydraulic oil.
Practical effect 1-1 is also high in that the frequency of replenishment and replacement of hydraulic oil can be reduced.

Hereinafter, an embodiment of the present invention will be explained based on a wheel height adjustment device for a walking rice transplanter, which is illustrated.A walking rice transplanter is a grounding machine that can move up and down and slides on the rice field to level the area to be planted. The planting part 10 is installed at the rear of the fuselage, which is equipped with a float 1, a pair of left and right propulsion wheels 2, 2 with lugs that can swing up and down and move on a plowing platform, and a steering handle 9 that extends rearward.
At the same time, the engine 11 and the mission case 12 are installed in the front part, which are connected to each other. In order to maintain the height of the plant, a wheel height adjustment device is provided to raise and lower the wheels 2, 2 relative to the machine frame such as the float 1 and the planting part 10.

The planting unit 10 reciprocates the seedling tray 13 in a downwardly inclined position in the lateral direction, and performs seedling planting by moving the claws 14 in a circular motion in the vertical direction, thereby placing the seedlings on the seedling tray 13. The system is designed to take out seedlings in unit quantities and plant them on the river surface.

The wheel height adjustment device includes a lifting drive mechanism 3, an attached device 4 that turns on and off the operation of this drive mechanism 3, an operating device 5 that manually operates this attached device 4, and
The wheel quantitative lowering mechanism 6 is interlocked with the operation of the drive mechanism 3 based on the ON operation of the auxiliary device 4 by human operation, and turns off the auxiliary device 4 when the wheel 2 is lowered to a limit amount.

The drive mechanism 3 includes a hydraulic cylinder 15, an arm 17 that swings around a horizontal axis 16 in conjunction with the expansion and contraction operation of the hydraulic cylinder 15, and a wheel 2°2 that swings around the transmission case in conjunction with the swing of the arm 17. It consists of a wheel support frame 18, which also serves as a transmission case and which is supported by a shaft 12 and is swingable up and down.

A torsion bar 21 is interposed between the arm 17 and the left and right interlocking rods 20, 20, and the hydraulic cylinder 15 is telescopically operated using lubricating oil in the transmission case 12 as hydraulic oil. It is something to do.

The accessory device 4 comprises a control valve for the hydraulic cylinder 15 attached to the transmission case 12.

The operating device 5 connects one end of an L-shaped lever 23 that can freely swing around the horizontal axis 22 to the flow 1-1 via a rod 24, and connects the vicinity of the other end of the L-shaped lever 23 to the control valve. By interlocking and connecting to the spool 4a of 4, based on the downward movement of the float 1 as the depth of the tiller changes,
Planting is carried out by acting on the above-mentioned link 23 of an automobile wheel lift control mechanism configured to raise and lower the wheels 2, 2 in a direction opposite to the float displacement direction while keeping the height of the rice planting surface of the part 10 constant. The wheels 2.2 are moved up and down by swinging around the axis 22 of the L-shaped link 23, which presses and swings the L-shaped link 23 only in the direction that lowers the wheels 2.2. A suppression lever 25 is movable and can be moved to a position where it does not act on the L-shaped link 23, and is swingably attached to the steering bundle 9, and a rod 26.26.
', and an operating lever 8 which is interlocked and connected to a pressing lever 25 via a bell crank 27.

The wheel quantitative lowering mechanism 6 is connected to the arm 1 of the drive mechanism 3.
The wheels 2,
2 descends to a limit amount, a pressing contact tool 29 contacts and presses the free end of the L-shaped link 23 to swing the L-shaped link 23 back to a neutral position in which the drive mechanism 3 is not operated.
It is configured by adding.

Therefore, in this embodiment, the wheel quantitative lowering mechanism 6
The rod material 28 is slidable in the longitudinal direction with respect to the rod material portion located between the press contact tool 29 and the L-shaped link 23, and a wavy shape formed on the rod material 28 over the entire length in the longitudinal direction. It has a sliding fixing protrusion 31 that can be freely engaged with and detached from the locking surface 30 and a spring 32 that biases the protrusion 31 in the locking direction, and when the rod member 28 is slidably fixed to the rod member 28, the pressing A stopper 7 is provided which performs a wheel lowering restriction function similar to that of the abutment tool 29, and when the stopper 7 is in a freely sliding state, the distance H between the stopper 7 and the L-shaped link 23 is is held constant regardless of the swinging of the L-shaped link 23, while allowing the stopper 7 to move toward the L-shaped link 23 as the rod material 28 moves when the stopper 7 is in a fixed position. To,
A U-shaped leaf spring 33 is provided to connect the stopper 7 and the L-shaped link 23.

Therefore, if the stopper 7 is in a fixed position, the wheel 2
, 2, due to the movement of the rod material 28 as it descends, the
The collar 7 presses the L-shaped ring 23 to lower the L-shaped link 23 until it switches to the neutral position.

Therefore, by setting the distance H between the stopper 7 and the L-shaped link 23, when the wheels 2, 2 have descended by a certain amount, the descent of the wheels 2, 2 can be automatically stopped.

Further, an operating lever 8, which is interlocked and connected to the stopper 7 via a wire 34, is swingably pivoted to the steering bundle 9, so that the stopper 7 can be operated from the bundle operating position.

The operating lever 8 also serves as the manual operating lever of the operating device 5 and the operating lever of a clutch installed in the transmission system to the planting section 10, and switches the stopper 7 to a fixed state. When operated, the pressing lever 25 is swung to push the L-shaped link 23 toward the wheel lowering side, and at the same time, the planting clutch is disengaged.

Also, the L-shaped link 23 is pressed by the stopper 7 as the wheels 2, 2 descend with the stopper 7 fixed.
When the float 1 swings back to the neutral position, by elastically engaging and holding the control lever 8 in the corresponding neutral swinging position, the L-shaped link 23 is moved in the wheel upward operation direction as the float 1 moves downward under its own weight. At the same time as preventing the swing to
In this lever neutral swinging position, the planting is configured to maintain the partial clutch in the disengaged state.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel height adjustment device in a rice transplanter according to the present invention, FIG. 1 is an overall side view of the rice transplanter, FIG. 2 is an enlarged side view showing the wheel height adjustment device, and FIG. 3 is an enlarged side view showing the wheel height adjustment device. Enlarged longitudinal cross-sectional side view of the main part, Figure 4a. The mouth is a schematic side view of main parts showing operation. 1...Float, 2...Curved wheel, 4...Opening control valve, 6...Wheel quantitative lowering mechanism, 8...Bending operation lever, 1°...Plant Attached part is 15...Hydraulic cylinder.

Claims (1)

[Scope of Claims] 1. A planting section 1o is connected to a traveling machine body equipped with wheels 2 that are raised and lowered by a hydraulic cylinder 15, and a control valve 4 of the hydraulic cylinder 15 is connected to a ground float 1 that is provided so as to be movable up and down. An automobile wheel elevation control mechanism is provided which is linked to the vehicle and controls the elevation and descent of the wheels 2 in a direction opposite to the float displacement direction based on the vertical displacement of the float 1 with respect to the aircraft body.
The wheel height adjustment device for a rice transplanter is configured such that the wheel height can be forcibly switched to the wheel lowering side by the operating lever 8, and the device is activated in conjunction with the operation of the operating lever 8 to the wheel lowering side. A wheel quantitative lowering mechanism 6 is provided, and the wheel quantitative lowering mechanism 6 is configured to automatically stop the wheel lowering operation at a position where the wheel 2 is lowered by a certain amount from the wheel position at the time when the wheel is activated by the operation lever 8. A wheel height adjustment device for a rice transplanter. 2. The control lever 8 has a structure that also serves as the operating lever of the partial clutch for planting, and the planting is interlocked so that the partial clutch is disengaged by switching operation to the wheel lowering side.
Wheel height adjustment device 3゜3 Hydraulic cylinder 15 described in Section 3
A planting section 1o is connected to a traveling machine body equipped with wheels 2 that can be raised and lowered by a machine, and a control valve 4 of the hydraulic cylinder 15 is connected to a grounding float 1 that can move up and down. A rice transplanter is provided with an automobile wheel elevation control mechanism that controls the elevation of the wheel 2 in a direction opposite to the float displacement direction based on the displacement, and the control valve 4 is configured to be forcibly switched to the wheel lowering side by an operating lever 8. In the wheel height adjustment device, a wheel quantitative lowering mechanism 6 is provided which is activated in conjunction with the operating lever 8 being operated to the wheel lowering side, and the wheel quantitative lowering mechanism 6 is controlled by the operating lever 8 to lower the wheel. In a rice transplanter, the control valve 4 is automatically forced to return from the wheel lower position to a neutral position when the wheels 2 have lowered a certain amount from the wheel position at the time when the control valve 4 was switched to the wheel lower position. Wheel height adjustment device.