JPH0233466Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention has a front float installed at the front left and right center of the propulsion wheel, and a pair of rear floats on the left and right at the bottom of the seedling planting device placed behind the propulsion wheel. is installed so that it can freely swing up and down within a certain range around the rear fulcrum, and is equipped with a planting depth adjustment mechanism that adjusts the rear fulcrum of the rear float up and down. The height of the rear fulcrum relative to the body can be adjusted to be high in order to adjust deep planting in the field, and the height of the rear fulcrum relative to the body can be adjusted low in order to adjust shallow planting in soft fields. Regarding type rice transplanter.

[Prior Art] The adjustment range of a conventional rear float is such that its bottom surface changes from a forward downward slope (deep planting) to a forward upward slope (shallow planting).

[Problem that the invention attempts to solve]

Therefore, when planting deeply in a hard field, the bottom of the rear float slopes forward downward, and as the hardness of the field increases, there is a tendency to plant deeper, so the forward downward slope increases. , the amount of thrust of the front end of the rear float into the mud surface increases, and the front part of the rear float discharges more mud laterally, which increases the impact on already planted seedlings and increases running resistance. It was hot. Furthermore, when the inclination angle of the float becomes large in hard fields, there is a problem in forming grooves.

The purpose of the present invention is to provide a system that can reliably solve the problems of the conventional structure by simply changing the vertical swing adjustment range of the rear float.

[Means for solving problems]

The characteristic configuration of the present invention is that the bottom surface of the rear float in the free state is in a front upward slope in almost the entire adjustment range of the planting depth adjustment mechanism, and the lower the rear support point is, the larger the front upward slope angle becomes. The functions and effects are as follows.

[Effect]

In other words, the bottom surface slopes upward in the front over almost the entire adjustment range, and the lower the rear fulcrum, the greater the angle of inclination in the front. Since the float is positioned at the upper limit of the adjustment range, the front upward inclination angle of the float becomes small, thereby suppressing an increase in running resistance and suppressing the formation of grooves in the field surface by the float.
In addition, when planting shallowly in a soft field, the softer the field, the shallower the planting, so the amount of sinking of the rear fulcrum becomes large, but the forward slope angle of the bottom of the rear float becomes large, so the mud surface Compared to the conventional structure where the front end of the float sinks in and pushes out the mud,
Since the contact surface with the rice field is the bottom surface in an inclined position, this inclined surface acts as a guide surface to guide the mud to a good mud flow, and the amount of discharged mud can be suppressed.

Therefore, when the field is hard, the resistance of the mud becomes large, which can be alleviated by setting the forward slope angle to be gentle, but when the field is soft, the amount of discharge from the float increases. By increasing the forward slope angle, it is possible to suppress the amount of discharge, and it is possible to use it differently depending on the hardness or softness of the field.

[Effect of idea]

As a result, by rationally matching the float posture to the adjustment range, it has become possible to perform good planting with an appropriate float contact state that corresponds to the hardness and softness of the field.

〔Example〕

As shown in Fig. 2, an engine 2 and a transmission case 3 are mounted on the front of the fuselage frame 1, and a seedling planting device A consisting of a seedling stand 4, a planting mechanism 5, etc. is mounted on the rear of the fuselage frame 1, and is operated. Equipped with a handle 6, propulsion wheels 8 are arranged on both sides of the transmission case 3 so as to be able to swing up and down via wheel cases 7, and a ground sensor that also serves as a ground sensor is provided at the center of the front left and right sides of the propulsion wheels 8, 8. A pair of left and right floats 9B, 9B are arranged below the front float 9A and the seedling planting device A to constitute a walking rice transplanter.

To explain in detail the vertical swing adjustment structure of the wheels 8, 8, a swing link 9 that can swing integrally with the wheel case 7 is provided upright on the pivot shaft of the wheel case 7 relative to the transmission case 3, and Piston rod 11 of hydraulic cylinder 10 as oscillating drive
Spring 1 allows the balance to swing around the vertical axis.
A swinging member 12 is provided via the swinging member 1.
2 and the tips of the swing links 9, 9 are interlocked with each other by connecting rods 14, 14, respectively.
It is configured such that it can simultaneously swing up and down, and can be positioned at staggered heights along the unevenness of the tiller by the balancing action of the swinging member 12. In addition, a sensor rod 15 erected from the rear end of the front float 9A is interlocked and connected to the operating arm of the control valve 16 of the hydraulic cylinder 10 to detect the vertical movement of the front float 9A corresponding to the unevenness of the tiller. Based on this, the propulsion wheels 8, 8 are moved up and down in the opposite direction to the up and down movement of the front float 9A,
It is constructed so that planting operations can always be performed at a constant height of the machine relative to the rice field.

As shown in FIGS. 1 and 5, the planting mechanism 5 will be described in detail. At the same time, crankshafts 18, 18 are provided protrudingly on both sides of this planted transmission case 17, and these crankshafts 18,
The planting arm 18 is fitted with the planting arms 19, 19 so that planting work for two rows can be performed, and extends rearward from the transmission case 3 in parallel with the planting transmission case 17. Crankshafts 21, 21 are provided on the support frame 20 so as to protrude outward from both sides, and the crankshaft 21 on the side of the planting transmission case 17 is interlocked and connected to the crankshaft 18, so that the power from the transmission case 3 is transferred to the planting transmission case 3. The transmission is transmitted to the crankshaft 21 on the support frame 20 side via the attached transmission case 17, and the planting arm 22 is fitted onto the crankshaft 21 to perform planting work for one row. The structure is based on a row planting machine so that three rows can be planted.

As shown in FIGS. 3 to 6, the position of the control handle 6 attached and fixed to the transmission case 17 located at the center of the width of the aircraft in the case of two-row planting changes as the planting transmission case 17 becomes three-row. The spring 13 fitted to the piston rod 11 of the hydraulic cylinder 10 prevents the weight balance of the machine from shifting laterally as the position changes away from the center of the width of the machine.
Spring 2 that urges the swinging member 12 laterally.
A propulsion wheel 8 is provided separately and located on the handle side.
The structure is such that the weight is biased toward the downward side to suppress the collapse of the weight balance.

As shown in FIG. 1, a pair of left and right rear floats 9B, 9B provided at the bottom of the seedling planting device A are pivotably supported on the front fulcrum 24 toward the body side so as to be able to swing up and down, and the planting case A support arm 26, which is pivotally supported by a support arm 25 so as to be vertically swingable, is connected to the rear support point 27 of the rear float 9B so as to be relatively rotatable, and an adjustment lever 28, which can be rotated integrally with the support arm 26, has an adjustment function. This constitutes a planting depth adjustment mechanism 29 that can freely swing the rear float 9B up and down within a certain range around the rear fulcrum 27.

The rear float 9B is configured such that its bottom surface is tilted upward in the front over substantially the entire adjustment range of the planting depth adjustment mechanism 29, and the lower the rear support point 27 is, the larger the tilt angle θ in the front is. be.
In other words, in order to adjust the depth of planting in hard fields, the amount of descent of the rear fulcrum 27 is reduced, the forward upward slope angle of the bottom of the rear float 9B is reduced, and the running resistance of the machine body is reduced. In soft fields, the discharge of mud can be suppressed by increasing the amount of descent of the rear support 27 and increasing the forward slope angle of the bottom surface in order to adjust shallow planting.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind rice transplanter according to the present invention, in which Fig. 1 is a side view showing the planting depth adjustment mechanism of the rear float, Fig. 2 is an overall side view, and Fig. 3 is a view showing the vertical movement of the wheels. FIG. 4 is a perspective view showing the moving mechanism; FIG.
The figure is a schematic plan view of a three-row planting form, and FIG. 6 is a schematic plan view of a two-row planting form. 8... Propulsion wheel, 9A... Front float, 9B...
... Rear float, 27 ... Rear fulcrum, 29 ... Planting depth adjustment mechanism, A ... Seedling planting device, θ ... Front upward inclination angle.

Claims (1)

[Scope of utility model registration request] A front float 9A is installed at the front left and right center of the propulsion wheel 8, and a pair of left and right rear floats 9 are installed at the bottom of the seedling planting device A placed behind the propulsion wheel 8.
B, 9B are installed so as to be vertically swingable within a certain range around the rear fulcrum 27, and the rear float 9
A walk-behind rice transplanter equipped with a planting depth adjustment mechanism 29 that vertically adjusts the rear fulcrum 27 of B, and in substantially the entire adjustment range of the planting depth adjustment mechanism 29,
This walk-behind rice transplanter is configured such that the bottom surface of the rear float 9B in a free state is in a front upward slope state, and the lower the rear support point 27 is, the larger the front upward slope angle θ becomes.