JPH0353611Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a float device in a walk-behind rice transplanter.

[Conventional technology]

Conventionally, a long float is attached to the bottom of the rice transplanter's body so that it can move up and down, and when traveling over the field for rice planting work, the float is glided over the field and leveled the field. I try to do it.

In this case, in order to improve the stability of the aircraft by reducing the distance between the lower surface of the aircraft and the upper surface of the float,
For example, Japanese Patent Publication No. 58-20082 discloses a swing arm for raising and lowering both the left and right wheels, in which the upper surface of the center of the float is recessed at a portion corresponding to the lower part of the rotation pivot to the fuselage.

[Problem that the invention attempts to solve]

When a recess is formed in the upper surface of the float in this manner, the protrusion on the lower surface of the body fits into the recess, thereby lowering the center of gravity of the entire rice transplanter. However, if mud or muddy water from the field gets into the recess, it will not come out, and the buoyancy of the float itself will change.
Moreover, the effort of scraping out this mud and muddy water becomes very troublesome.

On the other hand, in Japanese Utility Model Publication No. 54-42331, in order to make it easier for the mud from the field that is scooped up by the rotation of the wheels to fall onto the top surface of the float when it slides in the field during rice planting work, to make it easier for it to fall naturally onto the field. It is proposed to form a hole that is located slightly rearward from the central part and penetrates vertically.

In other words, the hole is located slightly rearward of the center of the float in the front-rear direction, where mud scraped up by the wheels tends to fall.

However, the hole in the above position could not perform the function of lowering the center of gravity of the aircraft.

This invention can lower the center of gravity of the rice transplanter, and
The purpose is to solve the technical problem of making it possible to discharge mud on floats.

[Means for solving problems]

For this reason, the present invention has a float installed on the underside of the machine on which the seedling planting mechanism is installed so that it can move up and down with respect to the machine, and a float that can swing up and down and extends backwards on both left and right sides of the machine. In a rice transplanter in which wheels are configured to be movable up and down via a swing arm, a transmission case of the machine body is provided with a rotational pivot portion relative to the base end of the swing arm, and a portion near the front of the float is provided with a pivot portion for rotating the base end of the swing arm. A hole is formed in the pivot portion so that the downwardly protruding portion of the mission case at the base thereof can be inserted therethrough, and extends vertically through the float.

[Functions and effects of the invention]

In this way, the rotation pivot part that rotatably supports the base end of the swing arm that extends rearward from the body of the rice transplanter and is capable of vertically swinging is provided in the transmission case, and the rotation support part at the base of the rotation pivot part is installed in the transmission case. A hole that passes through the top and bottom of the float is drilled in the front part of the float, which corresponds to the lower part of the downward protrusion of the shell case, so the swing arm can be rotated to allow the aircraft to approach the muddy surface of the field. When the center of gravity is lowered like this, the downward protrusion of the transmission at the base of the swing arm pivot can be inserted into the hole, without getting stuck on the top surface of the float, and the center of gravity of the rice transplanter body can be lowered. Can be kept low.

On the other hand, the muddy water on the upper surface of the front end of the float tends to move rearward due to inertia as the aircraft moves forward. The muddy water moving backward in this way can be immediately (naturally) discharged into the field through the hole drilled in the front part of the float in this invention, and the effect is that it does not cause a decrease in the buoyancy of the float. It is played.

[Embodiment] Below, an embodiment of the present invention will be explained with reference to the drawings. This figure shows a walk-behind rice transplanter consisting of a machine body 6 that is detachably connected to each other, a pair of left and right wheels 7, 7 on both the left and right sides of the machine body 6, and a float 8 longitudinally disposed on the bottom surface of the machine body 6. A pair of left and right vertically swinging seedling planting mechanisms 9 are attached to the transmission case 5, and each seedling planting mechanism 9 is configured to be able to plant seedlings on both left and right sides of the float 8. There is.

A pair of left and right operating handles 11, 11 are attached to the rear part of the transmission case 5, and a seedling stand 10 is mounted on the upper surface of the pair of operating handles 11, 11 so as to be able to reciprocate left and right.

Further, a bumper 12 is provided at the front end of the engine stand 3, and an engine 14 is mounted on the engine stand 3, with a hydraulic unit 13 in front and adjacent thereto. Furthermore, a lifting hydraulic cylinder 15 for raising and lowering both the left and right wheels 7, 7 at the same time and a so-called rolling hydraulic cylinder 16 for controlling the horizontal tilt of the body 6 are mounted on the lower surface of the engine stand 3. Furthermore, a pair of left and right float-like sensors 17a, 17b of a rolling sensor mechanism 22 associated with the rolling hydraulic cylinder 16 are mounted at positions in front of the wheels 7, 7 at the left and right positions of the float 8, and are movable up and down on the bumper 12. Attach to.

A drive shaft 19 is installed inside the cylindrical pivot parts 84, 84 that protrude from both left and right sides of the transmission case 2, and protrudes from the tip of each pivot part 84, and extends rearward at the tip of each drive shaft 19. The base ends of the swing arms 18a, 18b are pivotally supported to be movable up and down, and wheels 7 are provided at the rear ends of both the left and right swing arms 18a, 18b.

A belt 21 is connected to a pulley 20 on one side of the transmission case 2 from the engine 14 on the engine stand 3.
The wheels 7 are connected to the drive shaft 19, which is rotatably driven by the power from the transmission mechanism in the transmission case 2, which is transmitted through a chain in each swing arm, etc.
is driven.

A double-acting lifting hydraulic cylinder 15 for moving the left and right swing arms 18a, 18b up and down in the same direction to raise and lower both the left and right wheels 7, 7 at the same time.
is attached at its rear end to the rear plate 23 of the engine stand 3 at a lower surface position of the engine stand 3.

Piston rod 24 of the lifting hydraulic cylinder 15
is arranged so as to protrude in the front direction of the rice transplanter 1, and is attached to the piston rod 24 via the mounting piece 25. It is inserted into the front and rear longitudinal guide grooves 28, 28 so as to be freely movable back and forth.

A bracket 30 projecting upward from the left end in the direction of movement of the machine body of the inner shaft 29 fitted into the tube member 26 so as to be rotatable about its axis, and the arm 31 at the base end of the left swing arm 18a are connected to a connecting rod 32a. At the same time, a bracket 30 protruding downward from a boss 34 fitted onto the right end of the inner shaft 29 and fixed to a pin 33 is connected to the arm 31 at the base end of the right swing arm 18b by a connecting rod 32b. . As a result, the forward protruding movement of the piston rod 24 causes the swing arms 18 to move through the inner shaft 29.
a, 18b rotate upward, causing both vehicles 7, 7 to rise simultaneously, and conversely, due to the backward movement of piston rod 24, both swing arms 18a, 18b rotate downward, causing both vehicles 7, 7 to move simultaneously. configured to descend.

At this time, the guide bodies 35, 35 protruding into the pipe member 26 are connected to the left and right vertical plates 27, 2 of the engine stand 3.
7, the tube member 26 can be moved along the left and right front and rear longitudinal guide grooves 28, 28 without being displaced in the left and right direction. Since the inner shaft 29 is inserted into the inner shaft 29, the piston rod 24 of the lifting hydraulic cylinder 15 will not be twisted even if the left and right swing arms 18a, 18b are twisted in opposite directions.

The rolling hydraulic cylinder 16 has a piston rod 3 attached to a bracket in the middle of the inner shaft 29.
The rear end of the double-acting rolling hydraulic cylinder 16 is pivotally connected to a bracket 37 projecting backward from the pipe member 26, and the rolling sensor mechanism 22 and engine stand 3, which will be described later,
By operating the upper hydraulic unit 13, the rolling hydraulic cylinder 16 is driven to rotate the inner shaft 29 about its axis, so that both wheels 7, 7 move up and down in opposite directions. This performs so-called rolling control in which both the left and right sides of the aircraft are in a substantially horizontal state.

Note that 41 is the rolling hydraulic cylinder 1.
This is a rolling lock mechanism that stops the upside-down operation of both wheels 7, 7 by blocking the rotation of the inner shaft 29 by operating the hand handle 42 near the control handle 11, giving priority to the operation of the wheels 6.

The hydraulic unit 13 configuring the hydraulic circuit for driving the lifting hydraulic cylinder 15 and the rolling hydraulic cylinder 16 includes a hydraulic pump 44, an oil tank, a distribution valve, and a rotary unit that switches the hydraulic pressure to the lifting hydraulic cylinder 15. The engine 14 on the engine stand 3 is equipped with components such as a spool-type switching valve 47 and a spool-type switching valve 48 that switches the hydraulic pressure to the rolling hydraulic cylinder 16. The power is transmitted from the engine 14 to the hydraulic pump 44 by the belt 4.
9 and 50.

Reference numeral 55 indicates a lifting sensor that operates a rotary switching valve 47 that switches the hydraulic pressure for the lifting hydraulic cylinder 15. While the trochanter 57 at the tip of the movable arm 56 is brought into contact with the upper surface of the float 8, the arm 56
A lever 58 attached to the base end is connected to the shaft of the rotary switching valve 7.

In addition, the hand handle 5 near the control handle 11
9 is connected to the rotary shaft of the rotary type switching valve 47 via a telescopic joint, and by operating the hand handle 59, the rotary switching valve 47 is operated with priority over the operation of the lifting sensor 51.
By switching, both wheels 7, 7 can be operated up and down simultaneously.

The rolling sensor mechanism 22 for operating the rolling hydraulic cylinder 16 includes a pair of left and right float-like sensors 17 that are arranged to slide on the field surface on both the left and right sides of the float 8.
a, 17b, and a balance type link mechanism 62 mounted on the hydraulic unit 13.

The balance type link mechanism 62 has a horizontal shaft 6 extending in the longitudinal direction of the machine body 1 from approximately the left and right center of the machine body on a bracket protruding from the hydraulic unit 13.
A cylindrical balance rod 65 extending in both left and right directions of the machine is fixed to the lower end of a boss 64 which is rotatably fitted into the
The balance rod 65 is configured to be movable up and down.
One end of a link 69, 69 with a turnbuckle 68 is pivotally connected to arms 67, 67 attached to both left and right ends of a shaft 66 which is rotatably fitted therein.
The other ends of both links 69, 69 are repositionably fitted into sensitivity adjustment mounting holes of pivot arms 70, 70 bolted to the respective front ends of the pair of left and right float sensors 17a, 17b.

Also, a bracket 72 attached to the balance rod 65
The spool shaft 7 in the switching valve 48 is inserted into the engagement hole.
By engaging the horizontal tip of 4, the balance rod 6
The switching valve 48 switches the hydraulic pressure to the rolling hydraulic cylinder 16 in accordance with the vertical movement of the machine body 5 in the left-right direction.

Reference numeral 38 is a bonnet cover that covers the upper part of the transmission case 5 rearward from the balance link mechanism 62 on the hydraulic unit 13.

The front end of the float 8 has a link 51 protruding therefrom facing the vertically interlocking space between the front end of the engine stand 3 and the bumper 12, and is inserted into the vertical longitudinal hole 52 of the link 51 within the space. The seedling planting mechanism 9 is connected to the seedling planting mechanism 9 by fitting a pin 53 provided thereinto to connect the seedling planting depth adjusting rod 54 vertically. The system is configured so that the depth of planting seedlings in the field can be adjusted.

As shown in FIGS. 3 and 4, the float 8 has a downwardly protruding portion 2a of the lower surface of the transmission case 2 at its left and right center portions and toward the front in the front-rear direction. A hole 80 having a large planar area into which at least the base of a cylindrical pivot support 84 in which the shaft 19 is housed is fitted is formed so as to pass through the hole 80 vertically. As shown in FIG. 3, this hole 80 is formed in a so-called V-shape that widens forward and backward as the front and rear end faces go downward, so that the forward and backward movement of the float 8 can be controlled without reducing the buoyancy of the float 8. In either case, mud from the field is made difficult to get onto the upper surface of the float 8.

Further, on the lower surface of the float 8, downwardly open mud guiding grooves 81, 81 extending from near both left and right rear end edges of the attachment 80 toward both left and right end edges of the float 8 are provided.
is formed into a V-shape in plan view to facilitate mud discharge.

Furthermore, a parting line at the front end edge of the float 8 (the edge of the mating surface when the bottom plate and the top plate of the float 8 are brought together and fixed in order to form the float 8 into a hollow shape) is formed at a position near the top surface of the float. Furthermore, by making the front edge 82 protrude obliquely upward, it is made difficult for mud from the field to get on the upper surface of the float 8.

Note that the mission case 2 facing upwardly into the hole 80
A drain port is provided on the downwardly protruding portion 2a of the lower surface of the transmission case 2 for draining the oil in the transmission case 2, and a plug body 83 screwed into the drain port is configured to be attachable and detachable from the lower surface of the hole 80. It is something to do.

With this configuration, when the rice transplanter 1 turns in a direction or runs on the road, by pulling the hand handle 59 near the control handle 11, the operating rod connected thereto is connected to the rotary switching valve 47 via a telescopic joint. By rotating the rotary shaft, the two wheels 7, 7 can be lowered all at once, giving priority to the operation of the lifting sensor 51, and the body 6 can be raised significantly.

When the piston rod 24 in the lifting hydraulic cylinder 15 is moved backward greatly, the pipe member 2
6. Since the swing arms 18a and 18b, which are interlocked via the inner shaft 29 and the linking rods 32a and 32b, rotate downward, the wheels 7 and 7 attached to the ends of the swing arms are simultaneously moved toward the fuselage 6. In contrast, the aircraft descends and the aircraft ascends.

Also, during rice planting work, if the piston rod 24 in the lifting hydraulic cylinder 15 is moved forward and the wheels 7 are driven while the float 8 on the lower surface of the lowered machine body 6 is in contact with the field, the machine will move straight. By driving the seedling planting mechanism 9, the seedlings can be planted along a plurality of rows in the field while dividing the seedlings one by one from the seedling pine on the seedling platform 10 with its seedling claws.

At this time, if the machine body rolls and, for example, the right side of the machine body 6 tilts downward, the right sensor 17b is pushed up by the field, and the link 69 of the balance type link mechanism 62, the cylindrical balance rod 6
5, pull up the spooley shaft 74 of the switching valve 48 to switch, send hydraulic pressure to the rolling hydraulic cylinder 16, project the piston rod 36 of the rolling hydraulic cylinder 16, rotate the inner shaft 29 appropriately, and turn the right wheel. By pushing down the left wheel 7 while pushing down the left wheel 7, the right side of the fuselage is raised and the left and right sides of the fuselage 6 are restored to a substantially horizontal state, so-called rolling control.

In this way, a pair of left and right float sensors 1
By attaching 7a and 17b to the balance-type link mechanism 62 that protrudes to the left and right of the machine body, they are connected to the rolling hydraulic cylinder 16 via the scale-type link mechanism 62 and the switching valve 48, so that the machine body does not tilt to the left or right. Can be controlled automatically.

In the present invention, a large hole 80 into which the protruding portion 2a on the lower surface of the mission case 2 can be fitted is formed at approximately the center of the float 8 on the left and right sides and near the front in the front-rear direction. The protruding portion 2a is fitted into the hole 80 with a depth dimension or a cylindrical pivot support 84, 8 into which the drive shaft 19 protruding from both left and right sides of the mission case 2 is fitted.
The lower surface of the float 8 can be brought close to the upper surface of the front portion of the float 8 until it comes into contact with the upper surface of the front portion. Accordingly, the body 6 and the float 8 can be brought closer to each other, and the center of gravity of the entire rice transplanter can be lowered accordingly.

Moreover, since the holes 80 pass through the top and bottom of the float 8, muddy water etc. on the top surface easily returns to the field, the buoyancy of the float 8 does not change, and the vertical adjustment sensor of the aircraft body does not become erroneous.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view indicated by the - line in FIG. 1, and FIG. FIG. 4 is a bottom view taken along the - line in FIG. 3. 1...Rice transplanter, 2...Mission case, 2a
...Protruding part, 3... Engine stand, 4... Frame, 5... Transmission case, 6... Airframe, 7... Wheel, 8... Float, 80... Hole, 81, 81...
...Mud guiding groove, 82...Front edge, 84, 84...Rotating pivot, 9...Seedling planting mechanism, 10...Seedling stand, 11
... Control handle, 18a, 18b ... Swing arm, 14 ... Engine, 15 ... Hydraulic cylinder for lifting, 16 ... Hydraulic cylinder for rolling,
24, 36...Piston rod, 17a, 17b
... Float-shaped sensor, 22 ... Rolling sensor mechanism, 62 ... Balance type link mechanism, 13 ...
Hydraulic unit, 44... Hydraulic pump, 45... Oil tank, 47, 48... Switching valve, 26... Tubular member, 29... Inner shaft, 28, 28... Guide groove, 3
0, 30... Bracket, 32a, 32b... Link, 34... Boss, 55... Lifting sensor, 6
5... Cylindrical balance rod, 67, 67... Arm, 6
9, 69...link, 74...spool shaft.

Claims (1)

[Scope of utility model registration request] A float placed on the underside of the machine on which the seedling planting mechanism is installed is attached so that it can move up and down with respect to the machine, and wheels are attached to the machine via swing arms that extend backwards on both left and right sides of the machine and can swing up and down. In a rice transplanter configured to be able to move up and down, a transmission case of the machine body is provided with a rotational pivot portion for the base end of the swing arm, and a portion near the front of the float is provided with a base of the rotational pivot portion. 1. A float device for a rice transplanter, characterized in that a hole is formed to vertically penetrate through the float and into which a downward protrusion of a transmission case can be inserted.