JPH0229851Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a swing operation section of a control valve that lifts and lowers the wheels relative to the aircraft, and a control valve that swings up and down around the rear end axis and is biased downward. The front end side of the grounding float attached to the grounding float is interlocked with the front end side of the grounding float by a push/pull member that automatically operates the rocking operation section so that the grounding float assumes the set mounting posture, and the push/pull member is operated by the swinging operation. a stopper that is slidably connected to the ground float or the push/pull member and prevents the push/pull member from being pulled out from the swinging operation section toward the grounding float or from the grounding float toward the swinging operation section; is attached to the push-pull member so that the position can be changed freely in the sliding direction of this member, and the push-pull member;
between the swing operation section or the ground float,
The present invention relates to a wheel lifting/lowering operation structure for a walking rice transplanter in which a stroke absorbing spring is interposed in a state of initial elastic deformation.

The above rice transplanter is configured so that the planting depth is maintained almost constant regardless of changes in the depth of the tiller, and the control valve reaches the end of its stroke due to sudden and deep depressions in the tiller. Even if the grounding float rises relative to the aircraft, the stroke absorbing spring is elastically deformed to allow relative displacement between the grounding float and the push/pull member, or between the push/pull member and the swing operation section, The control valve is configured so that the control valve is not damaged because the valve spool that has reached the stroke end is not operated any further, and is maintained regardless of changes in the wheel drive reaction force caused by changes in the hardness of the mud. In order to adjust the installation posture of the grounding float in the neutral state of wheel elevation control so that the planting depth is constant, the extension length from the swinging operation part of the push/pull member to the float side, or the length of the grounding float It is configured to adjust the extension length from the oscilloscope to the swing operation section side. In this seed rice transplanter, the longer the extension length of the push/pull member is, the lower the elastic restoring force of the stroke absorbing spring is. Conventionally, as the extension length of the push/pull member is increased, Even if the elastic restoring force of the stroke absorption spring becomes smaller than the operating resistance of the control valve, and the ground float rises against the aircraft, the spring only elastically deforms and the control valve does not switch, preventing the wheels from lowering against the aircraft. There were times when this was not carried out.

An object of the present invention is to ensure that wheel elevation control is performed regardless of attitude adjustment of the ground float.

The present invention provides the above-mentioned wheel lifting/lowering operation structure of the walking rice transplanter, in which the stroke absorbing spring has an elastic restoring force greater than the operating resistance of the control valve, regardless of adjustment of the extension length of the push/pull member. The function and effect are as follows.

In other words, even when the extension length of the push/pull member is maximized and the elastic restoring force of the stroke absorbing spring reaches its lowest value, this elastic restoring force remains at a value larger than the operating resistance of the control valve. There is. Therefore, regardless of the adjustment of the grounding float attitude, the float's lifting action against the aircraft is reliably transmitted to the swing operation section, and the control valve switching is performed reliably, and the planting depth is maintained regardless of the hardness of the mud. Now I can work at a constant level.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, at the rear of a self-propelled aircraft that has a pair of left and right wheels 1, 1, an engine 2, a control handle 3, etc., two seedling planting devices 4, 4 and these seedlings are arranged in parallel in the lateral direction of the aircraft. A seedling stand 5 for feeding seedlings is provided in the planting device 4, and one ground float 6 having a length that spans almost the entire length of the self-propelled body is installed at the bottom of the self-propelled body around the axis _P1 on the rear end side. It is attached so that it can swing up and down, forming a walking rice transplanter.

As shown in FIGS. 1 and 2, a member 7 that pivotally supports the rear end side of the grounding float 6 is attached to a support shaft 9 of a transmission case 8 forming a self-propelled aircraft frame, and is pivoted up and down by an operating lever 10. The control lever 10 is fixed at the adjustment position by being locked and fixed by the lever guide 11, and by adjusting the mounting attitude of the float support member 7, the grounding float can be adjusted freely. The installation height of 6 can be adjusted and the planting depth can be adjusted.

The float support member 7 is removably attached to the support shaft 9, and as shown in FIGS. 3 and 4, instead of the ground float 6, two seedling planting devices 4, 4 can be used to plant the seedlings. One front grounding float 12 for leveling the ground, and a pair of left and right rear grounding floats 13, 13 for suppressing body rolling can be attached. And front ground float 1
2 is configured such that a support rod 14 extending rearward from the support rod 14 is pivotally connected to the support shaft 9 and is mounted so as to swing up and down around the axis of the support shaft 9, and the rear grounding float 13 is A pair of support arms 1 extending from a connecting rod 15 for the left and right floats 13, 13
6, 16 are pivotally connected to the support shaft 9, and the front end sides of the left and right floats 13, 13 are connected to a bending/extending link mechanism 17.
It is connected to the seedling stand sliding guide rail 18 via the support shaft 9, and is mounted so as to swing up and down relative to the machine body around the axis of the support shaft 9. The support arms 16, 16 are swing-adjusted by the operating lever 19, and the operating lever 19 is locked and fixed to the lever guide 11.
6 can be fixed, and by adjusting the mounting posture of the support arm 16, the mounting height of the rear float 13 can be adjusted, and the planting depth can be adjusted.

As shown in FIG. 1, the transmission cases 20 for the left and right wheels 1, 1 are moved up and down around the axis P2 by a hydraulic cylinder 22 that is linked to the transmission case swinging operation arm 20a via a push/pull rod ₂₁ , etc. By operating the cylinder 22, the left and right wheels 1, 1 can be raised and lowered integrally with respect to the traveling body in the same direction. Then, as shown in FIGS. 5 and 6,
The swing operation part 24 for the rotary control valve 23 of the cylinder 22 is connected to the boss part 24.
A spring 26 is attached to the valve spool 23a so as to be rotatable relative to the valve spool 23a through the spring 26, and a swinging member 25 is attached to the valve spool 23a so as to be integrally rotatable, and the spring 26 biases the control valve 23 to the wheel raising position up. A driven pin 25a is attached that comes into contact with the swinging operation section 24, and when the operation section 24 is in the neutral position N, the swinging member 25 is moved by the spring 26.
When the control valve 23 is held in the wheel stop position n by contacting and holding the control valve 23 in the neutral position against the 25 to operate the control valve 23 to the wheel lowering position dn.
When the vehicle swings in the direction of arrow U, the swinging member 25 is allowed to be pulled by a spring 26, thereby operating the control valve 23 to the wheel raising position UP. At the upper end side of the push/pull member 27 that slidably extends from the rotatable holder part 24b of the swing operation part 24 toward the float 6,
A stopper 28 is provided to prevent the push/pull member 27 from being pulled out toward the float 6, and a spring 29 is provided between the push/pull member 27 and the holder 24b.
is interposed. And this spring 29
, the frictional resistance of each member constituting the spool 23a and the operating system of the spool 23a, and the spring 2
The push/pull member 2 is initially elastically deformed so as to have an elastic restoring force that is greater than the operational resistance of the control valve 23 consisting of the urging force of 6, etc.
7 is brought into contact with the front end side of the grounding float 6, and the grounding float 6 is biased downward by its own weight and the spring 26, and the grounding float 6 is operated in the set mounting position. Furthermore, when the grounding float 6 rises relative to the aircraft beyond the stroke end of the valve spool 23a, an extra float stroke other than the stroke required for switching the control valve 23 is used. is absorbed by the elastic deformation of the spring 29 and the sliding movement of the push/pull member 27 relative to the operating section 24, and the operating section 24 and the ground float 6 are pushed so that damage to the control valve 23 is prevented. They are interlocked by a pulling member 27. That is, when the mounting height of the front end of the float 6 is within the set range, the control valve 23 is maintained at the wheel stop position n by the grounding action of the float 6 and the biasing action of the spring 26. When the front end side of the float 6 rises or falls beyond the set range, the control valve 23 is operated to the wheel lowering position dn or the wheel raising position UP by the ground reaction force acting on the float 6 or by the biasing force of the spring 26. The height of the planting device 4 above the ground is maintained within the set range regardless of changes in the depth of the tiller, so that work can be carried out while maintaining the planting depth almost constant. .

The extraction stopper 28 is screwed onto the push/pull member 27 so that its mounting position can be changed in the sliding direction, and the removal stopper 28 is screwed onto the push/pull member 27 so that the mounting position can be changed in the sliding direction. Adjust the extension length of the push/pull member 27 from the operating section 24 so that the planting depth maintained by the control is constant;
The mounting position of the grounding float 6 corresponding to the neutral state of the wheel elevation control can be adjusted.

The spring 29 is configured such that its elastic restoring force is greater than the operating resistance of the control valve 23 regardless of the extension length adjustment of the push/pull member 27. That is, even if the extension length of the push/pull member 27 is adjusted to the maximum, the elastic restoring force of the spring 29 remains at a value equal to or greater than the operating resistance of the control valve 23, and the hardness of the mud The structure is such that wheel elevation control can be performed without any problem regardless of the situation.

The release wire 30 shown in FIG. 5 is used to operate the control valve 23 and the planting clutch operating arm 31 in conjunction with each other. In other words, the planting clutch is engaged and automatic wheel elevation control is performed, the planting clutch is disengaged and automatic wheel elevation control is performed, the planting clutch is disengaged and the wheels are lowered, and the planting clutch is disengaged and the wheels are lowered. This is to create an alternative state in which the wheels are stopped moving up and down. The release wire 32 shown in FIGS. 5 and 6 operates the main clutch operating arm 33. And this release wire 3
A member 34 attached to 2 is a stopper that acts on the operating portion 24 so that the control valve 23 is not operated by the float 6 to the wheel lowering position dn only when the main clutch is in the disengaged state. Further, 35 shown in FIG. 5 is the swinging member 25.
The operating portion 35a or 35b is in contact with the pin 25b of the control valve 23, and is a stopper that determines the opening limit of the control valve 23 on the wheel rising side or on the wheel descending side.

In the present invention, as shown in FIG. 7, the push/pull member 27 is slidably extended from the ground float 6 toward the operating section 24, and the push/pull member 27 is provided with a mechanism to prevent it from coming off from the float 6. Stopper 36 to prevent
It can also be applied to a case where the stroke absorbing spring 29 is interposed between the push/pull member 27 and the float 6, in addition to attaching the stroke absorbing spring 29 so as to be able to change its position.

The specific shapes and mounting configurations of the stoppers 28 and 36 can be changed in various ways, such as making the stoppers 28 and 36 into washer shapes and attaching them to the push/pull member 27 so that the positions can be changed. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel lifting and lowering operation structure of the walking rice transplanter according to the present invention, FIG. 1 is an overall side view of the walking rice transplanter, FIG. 2 is a schematic plan view of the float mounting structure, and FIG. 3 is a schematic plan view of the float mounting structure. Figure 4 is a schematic plan view of the float being replaced; Figure 4 is a side view of the float being replaced; Figure 5 is a schematic plan view of the float being replaced;
6 is a front view of the interlocking system of the control valve and float, and FIG. 7 is a side view of an alternative push/pull rod mounting structure. DESCRIPTION OF SYMBOLS 1... Wheel, 6... Ground float, 23... Control valve, 24... Rocking operation part, 27...
...Push/pull member, 28, 36...Stopper, 29
...Spring, P ₁ ...Axis core.

Claims (1)

[Scope of utility model registration request] A rocking operation part 24 of a control valve 23 that lifts and lowers the wheel 1 relative to the aircraft body, and a grounding float attached to the aircraft body that swings up and down around the axis _P1 on the rear end side and is biased downward. 6 is interlocked with the front end side of the grounding float 6 by a push/pull member 27 that automatically operates the rocking operation section 24 so that the ground float 6 assumes the set mounting posture.
is slidably connected to the swinging operation section 24 or the grounding float 6, and the push/pull member 27 can be pulled out from the swinging operation section 24 to the grounding float 6 side, or from the grounding float 6. Stopper 2 that prevents extraction to the moving operation section 24 side
8 or 36 is attached to the push-pull member 27 so as to be able to change its position in the sliding direction of this member 27, and the push-pull member 27 and the swing operation section 24
Alternatively, there is a wheel lifting/lowering operation structure for a walking type rice transplanter in which a stroke absorbing spring 28 is interposed between the ground float 6 and the stroke absorbing spring 28 in a state of initial elastic deformation.
A wheel lifting/lowering operation structure for a walk-behind rice transplanter, in which the elastic restoring force is greater than the operating resistance of the control valve 23 regardless of adjustment of the extension length of the push/pull member.