JPH0763252B2 - Traveling farm work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the Invention [Field of Industrial Application] The present invention relates to a traveling agricultural work machine such as a walk-behind rice transplanter having a traveling mission case and a working mission case.

[Prior Art] A traveling mission case is provided at the front of the machine body, and a working mission case for planting work is provided at the rear of the machine, and a hydraulic device is provided above the traveling mission case. There is a walk-behind rice transplanter in which a hydraulic cylinder for raising and lowering the machine body is extended rearward from the rear part of the device.

In this type of walk-behind rice transplanter, transmission cases are provided on both sides of a traveling mission case so as to be vertically rotatable, and propulsion wheels are pivotally supported at the tips of the transmission cases. The left and right ends of the link plate attached to the piston rod of the hydraulic cylinder and the left and right swing arms integrated with the transmission case are connected by a connecting rod, and the transmission case is vertically moved by contracting the hydraulic cylinder. It rotates so that the machine body moves up and down with respect to the tiller.

[Problems to be Solved by the Invention] In the above conventional walk-type rice transplanter, since the hydraulic cylinder for lifting and lowering the machine body is provided in a cantilevered state, there is a difficulty in strength of the support structure of the hydraulic cylinder. However, the hydraulic cylinder could bend due to repeated loads when the machine was moved up and down. Further, since the piston rod of the hydraulic cylinder has a structure capable of rotating around the axis, a force acts in the twisting direction on the left and right connecting rods.

As a structure for reinforcing the hydraulic cylinder support portion and preventing rotation of the piston rod, as shown in FIG.
A structure is considered in which a guide rod 71 is attached to the main frame 70, and a piston rod 72a of a hydraulic cylinder 72 is supported by this guide rod so that the piston rod 72a can advance and retreat. In this structure, the rear end of the guide rod is the main frame. Since it is attached to the middle part, the guide rod does not function sufficiently as a reinforcing material for the main frame, and for example, when the aircraft leans to the left or right and a large downward force is applied to one wheel, There is a possibility that the guide rod may be slightly bent or twisted so that a good working state cannot be obtained. In a rice transplanter such as a four-liner with a float on the outside of the wheel, even if the wheel on one side greatly descends, the float will support the machine body, so a large bending force or torsional force will act on the hydraulic cylinder. It is difficult, but in rice transplanters such as two-row planting where the float is not provided on the outside of the wheel, when the machine leans, a strong force that pushes down the wheel on the lower side and lifts the machine acts. The cylinder was easy to bend or twist.

(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 walk-type rice transplanter according to the present invention is provided with a traveling section transmission case in which a pair of left and right transmission cases supporting left and right wheels are rotatably attached in the front part of the machine body,
An agricultural working machine such as a walk-behind rice transplanter in which a float is provided on the inside of the wheel and a working unit mission case provided at the rear of the machine body and the running unit mission case are connected by a main frame, and the transmission case is rotated. A hydraulic cylinder that moves and raises and lowers the wheels is provided so as to extend rearward from the traveling section mission case side, and the left and right transmission cases are connected to the left and right links attached to the piston rods through connecting rods, respectively. A guide rod, the rear part of which is attached to the working part mission case and the front part of which is attached to the hydraulic cylinder or the traveling part mission case, is provided in parallel with the hydraulic cylinder, and the piston rod of the hydraulic cylinder can be moved back and forth on this guide rod. It is characterized by being guided and supported by.

[Operation] Since the piston rod of the hydraulic cylinder is supported by the guide rod parallel to the hydraulic cylinder so as to be able to move forward and backward, the hydraulic cylinder has a double-supported beam structure, which improves the resistance to bending force, and the piston rod rotates around the axis. It will not rotate and the connecting rod will not be subjected to excessive force in the twisting direction. Further, since the rear part of the guide rod is attached to the work unit mission case, the strength of the guide rod itself is strong, and the main frame and the planting part frame are reinforced.

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

In this walk-behind rice transplanter 1, an engine 3 is arranged in the front part of a traveling part mission case 2, and transmission cases 6, 6 are provided on the side of the traveling part mission case 2 so as to be rotatable up and down. Propulsion wheels 7, 7 that are grounding wheels that support the working machine body are attached to the rear end of the transmission case. Further, a main frame 9 is projected rearward from a rear part of the traveling part mission case 2, and a planting part mission case is provided as a working part mission case which doubles as a planting part frame at its rear end.
Ten are provided.

The planting part mission case 10 is formed by connecting the upper housing 10a and the lower housing 10b with the intermediate connecting part 10c and the reinforcing plate 10d, and has a shape in which a space part 11 opening to the front and rear is formed in the central part as a whole. Has become. A rear frame 12 is fixedly connected to the rear of the planting section mission case 10, and a rail 13 and a support frame 14 attached to the rear frame are connected to a seedling tank.
15 is slidably supported to the left and right. A handle rod 16 is provided on the upper portion of the rear frame. The planting section mission case 10 is provided with a lateral moving device 17 and a planting device 18, which reciprocates the seedling tank 15 left and right by the lateral moving device 17, and a planting rod 19 of the planting device 18 is predetermined. The planting claw 19a provided on the tip of the plant moves up and down in such a manner as to draw the orbit of, and the seedlings are divided and taken out from the seedling mat held in the seedling tank 15 and planted in the field.

A fuel tank 21 and a fertilizer tank 22 are provided on the upper part of the machine body. The fertilizer in the fertilizer tank 22 is delivered to the delivery pipe 24 by the delivery device 23, and is supplied to the field from the lower end portion of the delivery pipe. The upper part of these machines is covered with a bonnet 25, and a spare seedling stand 26 is provided on the upper side thereof. Further, on the lower side of the machine body, a rear part is pivotally attached by a support shaft 27, and a front part has a variable length link 28.
A float 29 supported by is provided for height adjustment.

Next, the hydraulic working machine body controller of the walk-behind rice transplanter 1 will be described.

A valve device 31 is provided on an upper portion of the traveling unit mission case 2, and a main cylinder 32 for raising and lowering the machine body is fixedly provided rearward at a lower portion of a rear surface of the valve device. A sliding body 34 biased rearward by a spring 33 is fitted to a rear end portion of a piston rod 32a of the cylinder, and a link plate 35 is fixed to the sliding body 34 horizontally and horizontally. The left and right ends of the link plate 35 are connected by the connecting rods 36 (L, R) to swing arms 38, 38 which rotate integrally with the transmission cases 6, 6, and the middle portion of the left connecting rod 36 (L). A sub-cylinder 39 for adjusting the left-right inclination of the machine body is interposed in the.

The height of the field scene is detected by the detection rod 41 attached to the float 29, the pitching valve in the valve device 31 is switched accordingly, and the main cylinder 32 expands and contracts. Then, the swing arms 38, 38 are turned back and forth through the connecting rods 36 (L, R), and the left and right propulsion wheels 7, 7 are turned.
At the same time, it moves up and down by the same amount with respect to the airframe, and as a result, the airframe moves up and down to maintain a constant planting depth.

Further, the pendulum 42 provided on the side portion of the valve device 31 detects the tilt of the machine body in the left-right direction, and the rolling valve in the valve device is switched accordingly, and the sub-cylinder 39 expands and contracts. Then, the left swing arm 38 is rotated and only the left propelling wheel 7 (L) moves up and down with respect to the machine body to correct the lateral inclination of the machine body.

In the main cylinder 32, the front portion of the cylinder tube 32b is integrally assembled with the valve device 31, and the rear end portion thereof is connected and integrated with the intermediate portion of the main frame 7 by the reinforcing plates 50, 50. Further, the guide rod 5 is provided between the support tool 52 vertically provided on the base of the cylinder tube 32b and the support tool 53 projecting on the lower housing 10b of the planting section mission case.
4 is provided in parallel with the main cylinder 32, and slides 3
A guide block 56, which is integral with 4, is slidably fitted to the guide rod 54. Since the guide block 56 moves along the guide rod 54 when the cylinder expands and contracts,
The piston rod 32a can move back and forth.

A bending load is applied to the main cylinder due to the angle of the swing arm during the lift control of the aircraft, but the main cylinder 32 of this example has a double-supported beam structure in which the piston rod 32a is supported by the guide rod 54. The bending strength is large. Further, in the main cylinder 32 of this example, since the guide block 56 is fitted to the guide rod 54, the piston rod 32a does not rotate around the axis, and the connecting rod 36 is not subjected to a twisting force or the like. .

5 and 6 are views showing a different embodiment, in which the extension shaft 60 of the piston rod 32a is extended to the position of the planting section mission case 10 and the lower housing of the planting section mission case is shown. Guide support 6 protruding above 10b
The extension shaft 60 is slidably fitted to the 1. This structure is also a double-supported beam structure in which the piston rod 42a is supported so as to be able to move forward and backward, and the extension shaft 60 serves as a guide rod. When this structure is adopted, it is desirable to prevent the piston rod 32a and the sliding body 34 from rotating relative to each other, as shown in FIG. 6, for example.

[Advantages of the Invention] As is clear from the above description, in the agricultural working machine according to the present invention, since the hydraulic cylinder for raising and lowering the machine body has the double-supported beam structure, the bending strength is high, and the cylinder due to long-term use is used. Can be prevented from bending. Further, since the piston rod can be structured so as not to rotate about its axis, an unreasonable force does not act on the connecting rod, which is also preferable in this respect. Further, since the rear portion of the guide rod is attached to the mission case that also serves as the working unit frame, the strength of the guide rod itself is strong, and there is an effect that it reinforces the main frame and the planting unit frame.

[Brief description of drawings]

FIG. 1 is a side view of an example of an agricultural working machine according to the present invention, and FIG.
The drawing is a plan view thereof, FIG. 3 is a front view of a planting part frame, and FIG. 4 is a side view of a main part. FIG. 5 is a side view of an essential part of a different embodiment, and FIG. 6 is a sectional view taken along the line SS. Also,
FIG. 7 is an explanatory view showing a conventional example. 1 ... Walking rice transplanter, 3 ... Running mission case,
10 …… Planting section mission case, 31 …… Valve device, 32
...... Main cylinder, 32a ...... Piston rod, 39 ......
Sub cylinder, 54 …… Guide rod, 56 …… Guide block, 60 …… Extension shaft.

Front Page Continuation (72) Inventor Kihachiro Hase 1 Yakura, Tobe-cho, Iyo-gun, Ehime Pref.Iseki Agricultural Machinery Co., Ltd. 72) Inventor Manamoto Nagamoto, 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] Claims: 1. A transmission section transmission case, in which a pair of left and right transmission cases for supporting left and right wheels are rotatably mounted in the vertical direction, is provided at the front of the machine body, a float is provided inside the wheels, and a rear portion of the machine body is provided. An agricultural working machine such as a walk-behind rice transplanter in which a working unit mission case and a running unit mission case provided on a main frame are connected to each other, and a hydraulic cylinder that rotates the transmitting case to raise and lower wheels is used as the running unit mission. The left and right transmission cases are connected to the left and right links attached to the piston rods of the case via the connecting rods, and the rear part is attached to the work part mission case and the front part is attached. Is installed in parallel with the hydraulic cylinder or a guide rod attached to the hydraulic cylinder or the traveling section motion case. Guide traveling farm machine, characterized in that rod is retractably guided and supported the piston rod of the hydraulic cylinder.