JPH0343009A - Working machine of walking type for paddy field - Google Patents

Abstract

PURPOSE:To lower the center of gravity of a mission case with preventing damage by entering the transmission case into a depression part of upwardly concave having a bottom installed in front part of center float and opening mud-ejecting hole at rear side position of the depression part. CONSTITUTION:Transmission case 1 is entered into a depression part 15a of upwardly concave having a bottom installed in a front part of a center float 15 to lower center of gravity of the transmission case and prevent damage of bottom face of the transmission case. A mud-ejecting hole 15d is opened at a lower face side of the rear side position of the depression part 15a to prevent stagnation of mud in the depression part.

Description

DETAILED DESCRIPTION OF THE INVENTION 5. Field of Industrial Application The present invention relates to a walking rice paddy working machine such as a rice paddy direct sowing machine and a walking rice transplanter.

[Conventional technology]

A walk-behind rice transplanter, which is a type of walk-behind paddy field work machine, drives wheels up and down that run on an uneven plowing platform.
It has a structure that maintains a constant height from the rice field to the aircraft body, and the vertical movement structure of the wheels is such that a transmission case extends rearward from the mission case at the front of the aircraft body, and wheels are provided at the rear end of the transmission case. There is a structure in which the case is driven to swing up and down at the connection point with the transmission case.

The reason why the wheels are placed near the rear of the machine is that the rear of the walk-behind rice transplanter is equipped with a seedling planting device consisting of a seedling stand and a planting arm. During work, many seedlings are placed on the seedling stand, making the rear of the aircraft heavy and causing the aircraft to tend to descend backwards.At the same time, when moving forward, the reverse torque from the wheels causes the aircraft to further tend to descend backwards. But this is to prevent it.

[Problem to be solved by the invention]

In the case of the above-mentioned structure, when the transmission case is swung downward, the wheels move downward and at the same time move forward of the aircraft, weakening the effect of preventing the backward downward tendency as mentioned above.
The transmission case must be configured so that the wheels do not move forward of the aircraft even when the transmission case is swung, that is, the transmission case must be swung upwards or downwards from a substantially horizontal position.

In order to configure this, it is necessary to lower the position of the transmission case that supports the transmission case as much as possible, and one of the configurations is to provide a relatively large opening in the front of the center float, and There is one in which the position of the mission case is lowered so that the mission case is dropped (see Japanese Utility Model Application Publication No. 191723/1983).

However, with the above-described structure, when the vehicle is driven on a ridge or road, stones on the ground or the like may directly hit the bottom surface of the transmission case, causing damage to the transmission case.

The present invention aims to lower the position of the transmission case without causing damage to the transmission case.

[Means to solve the problem]

The feature of the present invention is that the walking type paddy field work machine as described above is configured as follows.

In other words, a recess with a bottom facing upward is provided at the front of the center float, and the mission case is inserted into this recess, and mud is placed in the rear part of the fuselage to guide the mud in the recess to the lower surface of the center float. The reason is that a punch hole is provided, and its functions and effects are as follows.

[For production]

With the configuration described above, the position of the mission case can be lowered by fitting the mission case into the recess of the center float. In this case, since the bottom surface of the mission case is not exposed downward, stones on the ground or the like will not directly hit the bottom surface of the mission case.

Also, if a recess is provided on the top surface of the center float, mud will enter the recess when driving in rice fields, but as the float moves, the mud will come out through the mud removal hole, so the mud will stay in the recess. Nothing.

〔Effect of the invention〕

As described above, it is now possible to prevent unexpected damage to the bottom of the mission case when lowering the position of the mission case. In addition, it is possible to prevent the problem of mud remaining in the recess.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A walking rice transplanter, which is one embodiment of the present invention, will be described below with reference to the drawings.

As shown in Figure 1.2.3, a mission case (1) is arranged at the left and right center of the front side of the aircraft, and an engine (3) is mounted on a frame (2) extending from the mission case (1) to the front of the aircraft. A transmission case (5) equipped with wheels (4) extends from the mission case (1) to the rear of the aircraft, and a transverse axis (P,
) around which a transmission case (5) is supported so as to be vertically swingable. A seedling planting device comprising a planting arm (24), a seedling stand (25), etc. is provided at the rear of the machine.

On the other hand, as shown in Figures 1 and 2, a single-acting type first hydraulic cylinder (6) is installed in the frame (2) located on the front side of the machine body than the transmission case (5). (6a) is supported with the piston rod (6a) facing forward of the fuselage, and a first balance arm (7) is attached to the front end of the piston rod (6a) so as to be swingable around the vertical axis (P2).

There is a horizontal axis (P3) on the left and right sides of the frame (2).
A swingable second balance arm (9) is provided around the rod, and a rod (lO) extends between both left and right ends of the first balance arm (7) and the lower ends of the left and right second balance arms (9). It is being constructed. Furthermore, the base of the transmission case (5) (horizontal axis (P
An arm (5a) is erected toward the top of the machine body (near l), and a rod (ll) is installed across this arm (5a) and the upper end of the second balance arm (9).

With the above structure, when the piston rod (6a) in the first hydraulic cylinder (6) is extended so as to protrude toward the front of the aircraft, the left and right transmission cases (5) are swung downward, and vice versa. When the first hydraulic cylinder (6) is contracted, the left and right transmission cases (5) are swung upward.

As shown in FIGS. 1 and 2, the arm (13) extends downward from the boss portion (12) fixed to the second balance arm (9) on the left side, and the 11th pressure cylinder (
6) Attach the bracket (14) to the tip of the piston rod (6a).
) is fixed, and a double-acting second hydraulic cylinder (8) is installed across the bracket (14) and the arm (I3). With the above structure, when the second hydraulic cylinder (8) is extended, for example, the second balance arm (9) on the left side in FIG. 1 rotates counterclockwise in the drawing, and the left transmission case (5) is swung upward, the first balance arm (7) is rotated counterclockwise in Fig. 2 by the left rod (10), and the right transmission case (
5) is operated to swing downward. In other words, by expanding and contracting the second hydraulic cylinder (8), the left and right wheels (4) can be moved up and down in a contradictory manner.

The expansion and contraction operations of the first hydraulic cylinder (6) and the second hydraulic cylinder (8) as described above are performed based on the operation of the center flow (15). In other words, this center float (
15), as shown in Fig. 3, its rear part is centered on the horizontal axis (P,
) and around the longitudinal axis (P, ), and the vertical movement of the front part of the center float (15) is mechanically detected and Hydraulic oil supply and discharge operations are performed. As a result, the first hydraulic cylinder (6) is expanded and retracted so that the center float (15) is at the set position relative to the machine body, that is, the height from the field surface to the machine body is the set height. be.

As shown in Fig. 4, the front part of the center float (15) has an operating arm (16) erected at its left and right center, and a pair of elongated holes are provided above and below the left and right center of this operating arm (16). (16a) and (16b) are provided. Then, the guide pin (19) fixed to the fuselage side is engaged with the lower elongated hole (16a), and the bell crank (
The pin (17a) of 17) is engaged in the upper elongated hole (16b).

As a result, the rolling motion of the center flow (15) around the front and rear axis (P, ) is controlled by the operating arm (16).
, via the bell crank (17) and the rod (20),
The operating part of the control valve (18) for the second pressure cylinder (8) (
18a). Therefore, the second hydraulic cylinder (8
) are expanded and retracted to keep the machine parallel to the field surface, regardless of the unevenness of the tiller.

It absorbs the vertical movement and rolling movement of the center float (15) as described above, and the transmission case (
In order to lower the position of 1), it has the following structure. In other words, as shown in the first factor and FIG. The mission case (1) is inserted.

This recess (15a) has a bottom (15b).

A longitudinal groove (15c) is formed rearward from the recess (15a) on the lower surface of the center flow 1- (15), and a portion of the recess (15a) on the rear side of the fuselage communicates with the groove (15c). A mud removal hole (15d) is provided. As a result, the mud that has entered the recess (15a) escapes through the mud removal hole (15d) as the aircraft travels.

The present invention is also applicable to a riding type rice transplanter in which a seedling planting device with a float is connected to the rear of the traveling body, and the planting mission case is dropped into a recess provided in the float of the seedling planting device. Yes, but it is specific to walking-type paddy field machines.

Incidentally, although reference numerals are written in the claims section for convenience of reference to the drawings, the present invention is not limited to the structure shown in the accompanying drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the walking type paddy field work machine according to the present invention,
Figure 1 is a side view of the vicinity of the mission case and wheel transmission case, Figure 2 is a plan view of the mission case and the vicinity of the wheel transmission case, and Figure 3 is an overall side view of the walking rice transplanter.
FIG. 4 is a front view of the vicinity of the operating arm at the front of the center float. (1)...Mission case, (4)...
・・Wheels, (5)・・Transmission case, (15)・
...Center float, (15a)...
- Center float recess, (15d)... Mud removal hole in the recess.

Claims (1)

[Claims] A transmission case (5) is supported on both left and right sides of a mission case (1) located at the front of the fuselage so as to be able to swing vertically, and this transmission case (5) is extended to the rear of the fuselage. A walking paddy field working machine equipped with wheels (4) at the extending end and a center float (15) at the lower left and right center of the machine body, the center float (15) having a bottomed upward recess in the front part thereof. (
15a), the mission case (1) is inserted into this recess (15a), and the recess (15a) is inserted into the recess (15a).
A walking paddy field working machine in which a mud removal hole (15d) for guiding the mud in the recess (15a) to the lower surface of the center float (15) is opened in the rear part of the machine in a).