JP3110885B2 - Wheel lift adjustment device for walking rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the elevation of wheels of a walking rice transplanter.

[0002]

2. Description of the Related Art Conventionally, as one form of a walking rice transplanter, left and right wheels are vertically moved up and down by a wheel lifting and lowering device.
There is a type in which the planting depth of the seedlings can be kept constant. The wheel lifting / lowering adjusting device includes a wheel lifting / lowering link mechanism for raising and lowering the left and right wheels in mutually opposite directions, and a wheel lifting / lowering link mechanism for the same. And a link lock means for locking the wheel elevating link mechanism and holding the left and right wheels at substantially the same vertical position.

[0003] In this manner, by locking the wheel elevating link mechanism by the link locking means, the body can be held substantially horizontally.

[0004]

However, in the above-described wheel lifting / lowering adjusting device, when the wheel lifting / lowering link mechanism is locked by the link locking means and the machine body is held substantially horizontally, the external load on the oil in the hydraulic cylinder is reduced. The hydraulic cylinder is damaged due to excessive pressure, and the hydraulic cylinder cannot be operated reliably by the hydraulic cylinder.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention comprises a wheel lifting link mechanism for connecting left and right wheels so as to be able to move up and down in mutually opposite directions, and a hydraulic cylinder for operating the wheel lifting link mechanism. In a wheel lifting and lowering adjustment device of a walking rice transplanter, link locking means for locking the wheel lifting and lowering link mechanism and holding the left and right wheels at substantially the same position in the vertical direction,
A wheel of a walking type rice transplanter, comprising: a hydraulic lock unit that locks a hydraulic circuit connected to a hydraulic cylinder; and an interlocking unit that locks the hydraulic lock unit in conjunction with a lock operation of a link lock unit. It is intended to provide an elevation control device.

[0006]

[Function] By extending and retracting the hydraulic cylinder, the left and right wheels can be moved up and down in mutually opposite directions via a wheel elevating link mechanism to roll the body left and right, and when holding the body substantially horizontal. Then, the wheel lifting link mechanism is locked by link locking means, and the left and right wheels are held at substantially the same position in the vertical direction.

At this time, when the link locking means is operated for link locking, the hydraulic locking means locks the hydraulic circuit connected to the hydraulic cylinder by the interlocking means, and the supply of hydraulic oil to the hydraulic cylinder is stopped. Further, no excessive pressure due to an external load acts on the oil in the hydraulic cylinder, and damage to the hydraulic cylinder can be prevented.

[0008]

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

A shown in FIG. 1 is a walking type rice transplanter equipped with a wheel lifting / lowering adjusting device 24 according to the present invention. The walking type rice transplanter A has a motor unit 2 mounted on a front part of a body k. A transmission section 3 is provided at the rear thereof, and the upper part of the motor section 2 and the transmission section 3 is covered with a bonnet 1. The shaft case 4 extends rearward from the lower rear surface of the transmission section 3. I have. 5 is a transmission mechanism, 19 is a spare seedling mounting table, and N is a spare seedling.

At the rear end of the shaft case 4, a planting mission case 6 is connected, and the planting mission case 6 is connected to a pair of right and left seedling planting mechanisms 21, 21 in an interlocking manner. The handle stay 7 is formed to extend rearward and upward, and handles 8, 8 branched to the right and left sides are attached to the upper end, and a seedling support frame 9 is provided in the middle of the handle stay 7. The seedling table 10 of low front and rear height on which seedling mats for two rows can be placed is continuously provided.

At the rear end of the shaft case 4, as shown in FIG. 1, a column 15 is erected upward and rearward, and an upper end of the column 15 and a seedling mounting disposed immediately behind the column 15. A traverse mechanism for traversing the seedling table 10 in the left-right width direction between it and the table 10
22 are interposed.

As shown in FIG. 1, a seedling vertical feed drive mechanism 20 is interposed between the horizontal feed mechanism 22 and the vertical seedling feed mechanism 23 attached to the lower rear wall of the seedling mounting table 10. ing.

As shown in FIGS. 1 and 2, a pair of left and right wheel transmission cases are provided on the left and right side walls of the transmission portion 3, respectively.
The front ends of the rear wheels 11 and 11 are connected to the front bevel gear cases 35 and 35 so as to be able to swing up and down freely.The left and right wheels 12 and 12 are connected to the rear ends of the wheel transmission cases 11 and 11 respectively. They are linked and connected via the wheels 36, 36, and a wheel lifting / lowering adjusting device 24 is provided between the two wheel transmission cases 11, 11.

As shown in FIG. 1, a float 25 is mounted vertically below the airframe k via vertical links 26 and 27 so as to be movable up and down. The left and right wheels 12, 12
, So that the planting depth of the seedlings can be kept constant by the seedling planting mechanisms 21, 21.

As shown in FIGS. 1 and 2, the wheel lifting / lowering adjusting device 24 includes a wheel lifting / lowering hydraulic cylinder 28 laid between the transmission unit 3 and the shaft case 4, and a cylinder body 28a of the cylinder 28. A swing arm 29 having a middle part swingably movable back and forth, and swing arms 13 and 13 erected from left and right ends of the swing arm 29 and left and right wheel transmission cases 11 and 11, respectively. Interlocking rods 30, 30
A swing hydraulic cylinder 37 attached to the left end of the swing arm 29 and the front end of the cylinder body 28a;
A link lock means 38 for locking the left and right wheels 12, 12 at substantially the same position in the vertical direction, a hydraulic lock means 39 for locking a hydraulic circuit connected to the swing hydraulic cylinder 37, and a hydraulic lock means 39 An interlocking means 40 for performing a locking operation in conjunction with the locking operation of the locking means 38, and the swinging arm 29 and the interlocking rods 30, 30 form a wheel elevating link mechanism 41. 30a is the rod connecting pin, 37
a is a cylinder connecting pin, 66 and 67 are front and rear cylinder stays, 68 is a swing support shaft, 69 is a connecting plate, and 76 is a connecting bolt.

The link lock means 38 attaches the base end of the support plate 42 to the swing arm 29, and connects the support plate 42 to the cylinder body 28a.
With a certain interval between them, they are extended forward along the cylinder body 28a, and a link lock pin 43 is attached to the lower surface side of the support plate 42 via a guide body 44 so as to be able to slide forward and backward. At the same time, it is urged forward by the spring 53,
At a position immediately before the link lock pin 43, a lock pin engagement plate 45 having a lock pin engagement hole 45a is provided.
a of the lock arm 46 is pivotally supported on the upper surface of the support plate 42, and the link lock pin 43 is connected to the middle of the lock arm 46 via the connection pin 43a. And the other end of the lock arm 46 is connected to one end of a link lock operation wire 47, and the other end of the link lock operation wire 47 is connected to a link lock operation lever 48 attached to a middle part of the handle stay 7. ing. 50 is a pivot pin, 51 is a wire connection pin, and 52 is a lever guide body.

The hydraulic lock means 39 is provided with a spool 56 slidably provided in a spool case 55 provided at a rear left portion of the transmission section 3 and a hydraulic circuit connected to a swing hydraulic cylinder 37 at the lower end of the spool 56. , A lock pin insertion hole 57 is formed in the upper end of the spool 56 in a transversely penetrating manner, and the tip end 58a of the spool lock pin 58 is inserted into the lock pin insertion hole 57. It is inserted freely. Reference numeral 59 denotes a rolling control arm.

The spool lock pin 58 is inserted into the lock pin insertion portion 55a of the spool case 55 so as to be slidable laterally in the left-right width direction, and a lock plate 58b is attached to the base end of the spool lock pin 58. The spool lock pin 58 is mounted outside the insertion portion 55a, and the spool lock pin 58 is elastically urged by a spring or the like in a direction in which the tip end portion 58a is removed from the lock pin insertion hole 57.

The interlocking means 40 connects one end of the inner wire 60a of the push-pull wire 60 to the rear end of the link lock pin 43, and connects one end of the inner wire 60a to the spool case 55 via the stay 61. The pin operating arm 62 is connected to a middle portion thereof, and the lock pin operating arm 62 is rotated by the inner wire 60a in conjunction with the link lock operation of the link lock pin 43 that slides forward to rotate the spool lock pin 58. Is slid toward the distal end, and the distal end portion 58a of the spool lock pin 58 is inserted into the lock pin insertion hole 57 to perform the spool lock operation.
60b is an outer wire, 63 and 64 are wire stays, and 65 is an arm support shaft.

The embodiment of the present invention is configured as described above. According to this embodiment, the following operation and effect are produced.

That is, when the cylinder body 28a of the wheel lifting hydraulic cylinder 28 slides back and forth along the piston rod 28b, the swing arm 29 also moves back and forth in conjunction therewith, and the left and right swing arms 13 and The left and right wheel transmission cases 11, 11 are vertically rotated via the wheel 13, and the wheels 12, 12 attached to the rear ends of the two wheel transmission cases 11, 11 are moved up and down.

When the swing hydraulic cylinder 37 expands and contracts, the swing arm 29 swings in the front and rear direction in conjunction therewith, and the left and right wheel transmission cases 11 and 11 are moved via the left and right swing arms 13 and 13. One is rotated upward and the other is rotated downward, so that the wheels 12, 12 attached to the rear ends of the respective wheel transmission cases 11, 11 are vertically moved up and down.

When the body is to be held substantially horizontally, the link lock operation lever 48 is operated for link lock via the lever guide body 52, and the link lock operation wire is operated.
The link lock pin 43, which has been pulled and held in the unlocked state by 47, expands and contracts forward by the urging force of the spring 44, and the lock pin engagement hole of the lock pin engagement plate 45.
45a, the link lock pin 43 is fixed in the front and rear horizontal position to restrict the swing of the swing arm 29,
The left and right wheels 12, 12 are held at substantially the same position in the vertical direction, and the body is held substantially horizontally.

At this time, in conjunction with the link lock operation of the link lock pin 43, the lock pin operating arm 62 is rotated by the inner wire 60a to press the contact plate 58b of the spool lock pin 58, The spool lock pin 58 is advanced and slid in the direction of the lock pin insertion hole 57 of the spool 56 so that the distal end 58a of the spool lock pin 58 is inserted into the lock pin insertion hole 57, and the spool 56 is In order to fix the vertical sliding to the neutral position, the supply of pressure oil to the swing hydraulic cylinder 37 that swings the swing arm 29 is also stopped, and the oil in the swing hydraulic cylinder 37 is forcibly applied by an external load. No pressure is applied.

Reference numeral B shown in FIGS. 3 and 4 is a stand for storing the rice transplanter. The stand B allows the walking rice transplanter A to be stored in an inverted state.

That is, as shown in FIG. 4, the rice transplanter storage stand B includes a rectangular frame-shaped lower frame 70 and a lower frame 70.
The lower frame 70 is provided with a pair of left and right intermediate frames 70b, 70b, and the left and right frames 70a, 70b.
Bumper fixing holes 72, 72 are formed in
Wheel transmission case supports 73, 73 are provided at the upper end of 1,71.

The wheel transmission case supporting portion 73 is formed of a pair of left and right holding pieces 73a, 73a for holding the middle part of the wheel transmission case 11 of the walking rice transplanter A, and the front and rear ends of the two holding pieces 73a, 73a. The connecting portions 73b, 73b, 73b, 73b respectively formed in contact with each other are connected to each other by connecting bolts 74, 74.

When the walking rice transplanter A is stored in this way, as shown in FIG.
The bumper b of the walk-behind rice transplanter A is fixed on the intermediate frames 70b, 70b of the walking type rice transplanter A with the fixing bolts 75 through the bumper fixing holes 72, 72, and the right and left wheel transmission cases 1 are held by the holding pieces 73a, 73a.
The midway portions of the wheels 11 and 11 are sandwiched from the left and right sides, and the connecting portions 73b and 73b that are in contact with each other are connected by connecting bolts 74 and 74, and the wheel transmission cases 11 and 11 are held by the holding pieces 73a and 73a. Thereby, the walk-behind rice transplanter A can be easily and quickly held in the inverted storage state.

By transporting in such a storage state, transport efficiency can be improved.

[0030]

According to the present invention, the following effects can be obtained.

That is, according to the present invention, the hydraulic locking means for locking the hydraulic circuit connected to the hydraulic cylinder is operated in conjunction with the locking operation of the link locking means for locking the wheel lifting link mechanism. It can prevent excessive pressure from acting on the oil in the hydraulic cylinder due to the external load, improve the durability of the hydraulic cylinder and extend the reliable operation of the wheel lifting link mechanism by the hydraulic cylinder. It can be secured well over a period.

[Brief description of the drawings]

FIG. 1 is a side view of a walking type rice transplanter provided with a wheel lifting / lowering adjusting device according to the present invention.

FIG. 2 is an explanatory view of a wheel lifting / lowering adjusting device.

FIG. 3 is an explanatory view of an inverted storage state of the walking rice transplanter.

FIG. 4 is a perspective view of a stand for storing a rice transplanter.

[Explanation of symbols]

 A Walk-behind rice transplanter 12 Wheels 37 Hydraulic cylinder for swing 38 Link lock means 39 Hydraulic lock means 40 Interlocking means

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01C 11/02 A01B 63/10

Claims (1)

(57) [Claims] 1. A wheel lift adjusting device for a walk-behind rice transplanter, comprising: a wheel lift link mechanism for connecting left and right wheels so as to be able to move up and down in directions opposite to each other; and a hydraulic cylinder for operating the wheel lift link mechanism. A link lock means for locking the wheel elevating link mechanism and holding the left and right wheels at substantially the same position in the vertical direction, a hydraulic lock means for locking the hydraulic circuit connected to the hydraulic cylinder, and a lock for the hydraulic lock means. An interlocking means for performing a lock operation in conjunction with an operation is provided.