JPH0767334B2 - Structure of planting work section of rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of use] The present invention relates to the structure of a planting work part in a walk-behind rice transplanter.

[Prior Art] An engine and a mission case for traveling are arranged in the front part of the machine body, paddy wheels for propulsion are provided on the side of the mission case, and a planting part frame and a planting device are provided in the rear part of the machine body. A walk-behind rice transplanter equipped with a planting work unit such as a seedling stand is widely used.

[Problems to be Solved by the Invention] The walk-behind rice transplanter having the above-mentioned configuration has a problem that when a seedling is placed on the seedling stand, the rear part of the machine becomes heavy and the maneuverability deteriorates. Further, if the length of the machine body is long, the turning performance is not good, so that there is a problem that unplanting occurs in the peripheral part of the field.

For this reason, it is preferable to shorten the length of the planting work part as much as possible, but the planting frame has a drive shaft that drives the planting device (planting rod) of the planting device and a movement that reciprocates the seedling table. A shaft, a planting shaft for transmitting the power from the prime mover to the drive shaft of the planting device, etc. are provided, and if the space near the seedling take-out port of the seedling mounting table is narrowed, the mud and Since it becomes difficult to remove foreign matters and perform maintenance work, a satisfactory structure has not been obtained.

(B) Structure of the Invention [Means for Solving the Problems] In order to solve the above problems, the present invention has the following structure.

That is, the structure of the planting work unit of the rice transplanter according to the present invention, the seedlings are placed on the seedling placing table for placing seedlings and reciprocating left and right to sequentially feed the seedlings to the seedling outlet, and the seedlings supplied to the seedling outlet. A structure of a planting working unit including a planting device to be planted in a field and a planting part frame to which the seedling table and the planting device are attached, wherein the planting part frame has a rotational power from a prime mover. To the planting device, a moving shaft that reciprocates the seedling mounting table to the left and right when left and right, and a planting device that is located below the planting shaft and that is transmitted from the planting shaft. A driving shaft for driving is provided on the front side of the seedling mounting table, respectively, and the moving shaft is arranged on the upper side of the planting shaft and in front of the extension line of the line connecting the driving shaft and the planting shaft. It is characterized by

[Operation] By providing a moving shaft above the planting shaft that transmits the power from the prime mover, the moving shaft is arranged with a margin so that it does not interfere with the transmission system to the planting device even if the machine body length is shortened. be able to. Further, since the moving shaft is arranged in front of the extension line of the line connecting the drive shaft for driving the planting device and the planting shaft, it is possible to widen the space above the seedling take-out port, Maintenance of the seedling take-out opening and its surroundings is easy and a compact structure can be achieved.

[Examples] Examples described in the drawings will be described below.

This walk-behind rice transplanter 1 is a four-row planter, and is provided with a traveling mission case 2, an engine 3, a hydraulic unit 4 and the like at the front of the machine body, and a rotation projecting to the side of the mission case 2 is provided. Transmission cases 6 and 6 are provided at the ends of the cylinders 5 and 5 so as to be vertically rotatable, and paddy wheels 7 and 7, which are grounding wheels supporting the airframe, are attached to the rear ends of the transmission cases. ing.
A main frame 9 is fixedly connected to the rear of the mission case 2 on the base side thereof. This rain frame 9
Has a shape in which it extends rearward through the lower part of the airframe, then curves at the middle part, and the rear part jumps diagonally upward. Then, the planting work unit mounting bracket 10 is fixed to a position slightly forward of the curved portion, and the bracket 10
A planting section frame 12 having a power transmission mechanism inside, and a planting working section 15 including a planting apparatus 13, ... A handle rod 17 is attached to the rear end of the main frame 10.

The planting part frame 12 is provided with a moving shaft part 20 and a planting shaft part 21 vertically at the center of the left and right, and further with transmission pipes 22 (L, R) projecting from both ends of the planting shaft part 21, A chain case 23 (C, L, R) is vertically provided at a position to the right of the center of the planting shaft portion 21 and at the ends of the left and right pipes 22 (L, R). Then, a total of 4 sets of the planting device 13 are provided, one set on each side of the cylindrical portion 23a at the lower end of the central chain case 23 (C) and one set on the inner surface side of the lower end parts of the left and right chain cases 23 (L, R). , ... are provided. Also,
A bracket 24 is fixed to the lower end of the central chain case 23 (C) on the side of the planting work section. Further, support rods 25, 25 extending rearward are provided at the lower ends of the left and right chain cases 23 (L, R).
Are integrally provided, and a seedling table support frame 26 is horizontally installed on the upper surface side of the rear end portion of the support rod which is warped. Then, by the seedling table support frame 26 and the rail 29 attached to the support member 28 fixed to the rear end of the main frame 9, the seedling table part 14 which is inclined so that the front part is in the lower position slides left and right. It is supported freely. The seedling mounting table 14 is a table partitioned into four surface seedling mounting tables 14a, ...
A seedling feeding device 30 for feeding the seedlings on the table downward is provided for each. At the front end of the upper surface, a seedling guide rod 31 is horizontally installed at a height of about half the height of the seedling, and branch rods 32, ... Are parallel to the seedling mounting table 14 at predetermined intervals from the seedling guide rod 31. It is provided. Below the seedling mounting table 14, each of the seedling mounting table 14a,
A pedestal 34 having a seedling take-out port 33, ... Corresponding to ... Is provided integrally with the seedling placement table support frame 26. In addition, the left and right support rods 25, 25 include a float support rod 3 for supporting a float, which will be described later.
5 is laid horizontally so that it can rotate around the axis. A planting depth adjusting lever 84 described later is attached to the float support rod 35.

These planting work parts 15 (the parts surrounded by imaginary lines in FIG. 3) are assembled as one unit, and the bracket 24 of the planting part frame and the bracket 10 of the main frame should be fastened with bolts or the like. As a result, the whole body is integrally mounted on the main frame 9. In this embodiment, the support member 28 and the rail 29 are fixed to the main frame 9 side, but in some cases, they may be assembled to the planting work section 25 side.

Next, explaining the mechanism in the planting part frame 12,
A transmission shaft 40, which is connected to the mission case 2 and takes out rotational power, is fitted into the planting shaft portion 21 passing above the main frame 9, and the rotational power of the transmission shaft is supported in the planting shaft portion 21. It is transmitted to the shaft 41 via bevel gears 42 and 43.
A fixed-position stop clutch between the planting shaft 41 and the bevel gear 43.
45 is interposed, and when the rotation of the transmission shaft 40 stops, the planting shaft 41 stops at a predetermined rotation position. Furthermore, the rotation power of the planting shaft 41 is the chain case 23 (C, L, R).
It is transmitted to a crankshaft 48 (C, L, R) rotatably supported at the lower end of the chain case by chains 47 ,. The crankshaft 48 is a drive shaft that drives the planting device 13. Cranks 50, ... Are attached to the left and right ends of the central crankshaft 48 (C) and to the inner ends of the left and right crankshafts 48 (L, R), respectively. The crank 50 and the link 51 attached to the chain case support the planting rod 52 of the planting device 13, and when the crank shaft 48 rotates, the planting claw provided at the tip of the planting rod 52 follows a predetermined locus. The drawing operation is carried out up and down, and the seedlings on the seedling mounting table 14 supplied to the seedling taking-out port 33 are attached to the field scene.

On the other hand, in the moving shaft portion 20, a moving shaft 54 which is slidable in the axial direction and whose both ends project to the outside, and a lead metal claw 55 attached to the central portion of the moving shaft are in a spiral shape. A lead cam shaft 57 having a groove 56 cut in the outer peripheral portion is provided. Axis of movement
Seedling table supporting arms 58, 58 are fixed to both ends of 54, and the tip end thereof is connected to a bolt provided on the bottom side surface of the seedling table 14 with a mounting nut 59. The lead cam shaft 57 is the moving shaft
It is transmitted from the planting shaft 41 via a gear train type transmission 60 provided at one (left) end of the planting shaft part 21 and the planting shaft part 21. Also,
A driven cam shaft is provided on the side opposite to the side where the transmission 60 is provided.
62 is provided, and the lead cam on the side of the lead cam shaft 57 and the pair of driven cams on the side of the driven cam 62 form a cam mechanism 63. An arm 65 for operating the seedling feeding device 30 of the seedling mounting table is attached to the outer end portion of the driven cam shaft 62. When the lead cam shaft 57 rotates, the claw 56 of the moving shaft moves along the groove 57 of the lead cam shaft, so that the moving shaft 54 moves left and right together with the seedling mounting table 14. When the moving shaft 54 reaches the end of the left and right process, the driven cam shaft 62 is rotated in a predetermined direction by the action of the cam mechanism shaft 63 to activate the seedling feeding device 30, and one row of seedlings of the seedling take-out port 33. Transfer in the direction.

This planting part frame 12 has two shaft parts 20, 2 in a side view.
1 is arranged at a position along the outer periphery of the paddy wheel 7, and the moving shaft portion 20 is provided in front of the planting shaft portion 21. Also,
Each chain case 23 (C, L, R) is inclined so that the lower part of the chain case 23 (C, L, R) is in a front position, and a space 70 is formed between the chain and a support rod 25 provided by intersecting this at a sharp angle. The bottom portion of the seedling mounting table 14 is located in the space 70. Therefore, the moving shaft 54 is located on the wheel side, that is, on the front side with respect to the extension line AA of the line connecting the planting shaft 41 and the crankshaft 48 that is the drive shaft. Further, the planting shaft 41 in the planting section frame 12, the mounting nut 59 of the seedling mounting table 14, and the float support rod 35 are arranged on a substantially straight line. With such a configuration, the seedling table support arms 58, 58 are curved upwardly in a convex shape in a side view and have a shape bypassing the transmission pipe 22 and the chain case 23 of the planting part frame 12. Because of the above-mentioned configuration, the center of gravity of the planting section frame 12 is provided relatively forward, and since the seedling placing table 14 can be provided closer to the planting section frame 12, compared to the conventional one, Since the center of gravity is located closer to the front, the maneuverability is excellent and the overall length of the aircraft can be shortened.
Further, by moving the bottom part of the seedling placing table 14 close to the planting part frame 12, it is possible to reduce the movement amount of the planting rod 52 and improve the planting accuracy. If the support arms 58, 58 are attached not above the bottom of the seedling mounting table 14 but above it, the support arm 58 can have a linear shape, but the seedling mounting base has seedling soil at the lower end. If the support arm 58 is attached to the upper portion, the lower portion of the seedling mounting table may be deformed, which is not preferable because it adheres and receives resistance during movement.

The seedlings on the seedling mounting table 14 are supplied to the seedling take-out port 33 in a state where they are aligned in the same direction by the branch rods 32 and bent upward by the guide rods 31, so that the seedlings can be scraped off by the planting rods 52. It is performed well, and the seedling does not come into contact with the planting part frame 12 to be worn away.

Further, as shown in FIG. 4, the planting part frame 12 has a dividing surface F ₁ provided on the left end of the moving shaft part 20 and the planting shaft part 21 and a dividing surface F ₁ provided on the right end part of the moving shaft part 20. It is composed of five members P (1 to 5) divided by a plane F ₂ and a division plane F ₃ which divides the central chain case 23 (C) into vertical divisions. That is, the member P1 is composed of the central portion of the planting shaft portion 21, the left portion of the central chain case 23 (C), and the tubular portion 23a. Material P2
Is a portion 72 for accommodating the transmission 60 of the moving shaft portion and the drive shaft portion, the left transmission pipe 22 (L), and the left chain case 23 (L).
Consists of. The member P3 includes the right end portion of the planting shaft portion 21 integrally formed with the support flange 73, the right side portion of the central chain case 23 (C), the right transmission pipe 22 (R), and the right chain case 23.
(R). The left and right chain cases 23 (L, R) are integrally formed in a bag shape with an open upper end, and the opening is closed with a lid 74, so that there is no joint on the paddy side. , Excellent in watertightness because muddy water does not easily enter the case during work. When the chain is stored in the chain case, the lower sprocket hung by the chain from the opening is hung, and the crankshaft 48 can be inserted into the sprocket with the spcket placed at a predetermined position. Good. The member P4 constitutes the right end portion of the moving shaft portion 20 in which the cam mechanism 63 is housed, and is attached to the support flange 73. Further, the member P5 constitutes the central portion of the moving shaft portion 20. Since the moving shaft 54 and the lead cam shaft 57 are supported by the members P2 and P3, a large load is not applied to this member P5. Therefore, P5 can be molded with a lightweight pipe such as aluminum or a synthetic resin to reduce the weight of the flakes.

At the bottom of the aircraft, a center float 80 that is long in the front and back, and a pair of relatively small left and right side floats 81,8 as a grounding body.
And 1 are attached to the float support rod 35.
The mounting method is as follows: a float support piece 82 is rotatably pivotally attached to the tip of an arm 83 fixed to the support rod 35, and the support rod 35 is rotated around an axis by a planting depth adjusting lever 84. It is possible to change the support height of the float. The front part of the center float 80 is hung on the expansion / contraction link 85,
Further, the tip portion of the side float 81 is suspended by a height detection link described later.

Further, on the upper part of the machine body, the auxiliary seedling mount 99 is supported substantially horizontally by the support frame 97 and the pillars 98 attached to the planting part frame 12.

Next, the body control device of the rice transplanter 1 will be described.

A pitching cylinder 90 for raising and lowering the machine body is provided to extend rearward from a rear portion of the hydraulic unit 4, and a link plate 92 biased rearward by a spring 91 is horizontally attached to a tip end portion of the piston rod. . Link board
The left and right ends of 92 are connected to the upper ends of swing arms 94, 94 protruding upward from the rotary cylinders 5, 5 via connecting rods 95 (L, R). Then, a rolling cylinder, which is a rolling means of the fuselage, is provided at an intermediate portion of the left connecting rod 95 (L).
96 are installed.

The hydraulic unit 4 includes a switching valve 10 for the pitching cylinder 90.
A switching valve 101 for 0 and rolling cylinder 96 is provided. The upper end of the rod 103 for detecting the height of the field scene attached to the center float 80 is connected to the valve shaft of the pitching switching valve 100, and the pitching switching valve 100 switches according to the vertical movement of the detection rod 103. To be Further, the rolling switching valve 101 is switched by the left / right tilt detection device 105 described below. This left / right tilt detection device 105
Is a cylindrical body 106, 106 protruding from the side of the mission case 2.
Rotating shafts 107, 107 are provided inside the plate, and a plate-like swinging link 109 is fixed to the outer end of the rotating shaft. The rocking link 109 is provided with an elongated hole 110, and the shaft 111 provided at the tip of the side float 81 is loosely fitted therein, so that the side float 8
The swing link 109 swings in response to the vertical movement of 1 or more by a predetermined amount or more. On the other hand, a rotating arm 113 is attached to the inner end of the rotating shaft 107, and a rod 115 is attached to the rear end of the rotating arm.
The upper ends of the left and right rods 115, 115 are connected to the left and right ends of the balance rod 116. Balance rod 116
Is rotatably supported on a bearing member 118 by a shaft 117, and the spool of the rolling switching valve 101 is driven according to the rotation of the shaft 117.

Next, the control action will be described. The center float 80
The height of the field scene is detected by the detection rod 103 attached to the pitching switching valve 100, and the pitching cylinder 90 expands and contracts. Then, the swing arms 104, 104 are rotated back and forth via the connecting rods 95 (L, R), and the left and right paddy wheels 7, 7 simultaneously move up and down by the same amount, so that the aircraft moves up and down. The planting depth of seedlings is kept constant.

Also, when the field scene tilts to the left or right, the rod on the upside moves.
The balance rod 116 is rotated by pulling down the rod 115 on the side where the 115 is lifted and lowered, the rolling cylinder switching valve 101 is switched accordingly, and the rolling cylinder 96 expands and contracts. Then, only the paddy wheel 7 (L) on the left side moves up and down with respect to the machine body to correct the lateral inclination of the machine body.

[Effects of the Invention] As described above, the structure of the planting work unit of the rice transplanter according to the present invention is such that the moving shaft is provided above the planting shaft that transmits the power from the prime mover, thereby reducing the machine body length. Even if it is shortened, the moving shaft can be arranged with a margin so as not to interfere with the transmission system to the planting device, and the moving shaft is a line connecting the drive shaft for driving the planting tool and the planting shaft. Since it is arranged in front of the extension line, the space above the seedling take-out port can be widened, and maintenance of the seedling take-out port and its surroundings can be easily performed, and a compact structure can be achieved.

[Brief description of drawings]

FIG. 1 is a side view of a walk-behind rice transplanter showing one example of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view of its essential parts, FIG. 4 is a front view thereof, and FIG. FIG. 5 is a diagram showing a transmission mechanism in the planting part frame. 1 …… Walking rice transplanter, 2 …… Mission case, 3 ……
Engine (motor), 4 ... hydraulic unit, 7 ... paddy wheels, 9 ... main frame, 12 ... planting part frame,
13 …… Planting device, 14 …… Seedling stand, 15 …… Planting work section, 41
…… Planting axis, 54 …… Movement axis, 58 …… Seedling table support arm,
59 …… Mounting nut.

Claims (1)

[Claims] 1. A seedling placing table on which seedlings are placed and reciprocates left and right to sequentially feed the seedlings to a seedling taking-out port, a planting device for planting the seedlings fed to the seedling taking-out port in a field, and these seedling placing stands. And a planting part frame to which the planting device is attached, and a structure of a planting working part in a walk type rice transplanter having planting positions on the left and right outer sides of the wheels, wherein the planting part frame includes A planting shaft that transmits the rotational power of the plant to the planting device, a moving shaft that reciprocates left and right to reciprocate the seedling mounting table left and right, and a planting shaft located below the planting shaft from the planting shaft. A drive shaft for driving the planting device by transmission is provided on the front side of the seedling table, respectively, and the moving shaft is on the upper side of the planting shaft from an extension line of a line connecting the drive shaft and the planting shaft. The structure of the planting work part of the rice transplanter is characterized in that it is also arranged in the front.