JPH048208A - Walking-type working machine in paddy field - Google Patents

Abstract

PURPOSE:To make a connecting rod to be hardly deformed and improve accuracy of keeping a set height of a machine body by connecting an operation shaft from a control valve and a central part of an upper face in a center float with a connecting rod and vertically driving wheels with an oil hydraulic actuator. CONSTITUTION:A machine body is vertically driven to a center float 9 following the surface of paddy field with attaching and an operation part of a first control valve 14 is operated by a connecting rod 28 and a shaking arm 27, then left and right wheels are vertically driven in shaking by an oil hydraulic cylinder so as the machine body to keep a set height from the surface of the paddy field. Length L of a horizontal part 28a of a lower end of the connecting rod 28 is shorter than a former structure and a corner part 28b of the lower end is moved close to a central part in left and right of the center float 9. Thereby, bending moment applied to the corner part 28b is made small and the connecting rod 28 is hardly subjected to elastic deformation.

Description

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

[Conventional technology]

A walking rice transplanter, which is an example of a walking rice paddy work machine, has a center float (as disclosed in Japanese Patent Application Laid-Open No. 6.4-20015) that is movable up and down at the left and right center of the lower part of the machine. (6)) and
A pair of left and right wheels ((la), (lb)' in the above publication)
) for vertically driving the hydraulic cylinder (corresponding to a hydraulic actuator, (12) of the above-mentioned publication) and a control valve ((17) of the above-mentioned publication) is provided, and the control valve is connected to the left and right center portions of the upper surface of the center float. Some are mechanically interlocked and connected by a linking rod ((21) in the above publication).

As a result, when the aircraft moves up and down with respect to the center float that follows the ground contact with the rice field, the control valve is operated by this vertical movement and the left and right wheels are driven up and down so that the aircraft maintains the set height with respect to the rice field. It is.

[Problem to be solved by the invention]

In the above-mentioned walk-behind rice transplanter, the control valve is provided in the traveling transmission case ((8) of the above publication) located above the center float. Since this mission case has width from side to side, the connecting rod ((21) in the above publication) that connects the center float and the operating shaft that protrudes laterally outward from the control valve is located on the side of the mission case. It is bent into an L-shape to bypass the road.

As described above, when the linking rod is bent in an L-shape, the L-shaped corner of the linking rod may be elastically deformed when the aircraft body moves up and down violently with respect to the center float. As a result, the vertical movement of the machine body relative to the center float is not accurately transmitted to the control valve, which may impede the operation to maintain the machine body at a set height above the field surface.

The present invention aims to reduce the above-mentioned malfunctions.

[Means for Solving the Problems] A feature of the present invention is that the walking type paddy field work machine as described above is configured as follows.

In other words, it is equipped with a hydraulic actuator that drives a pair of left and right traveling wheels up and down, and a center float that is attached to the center of the lower part of the fuselage so that it can move up and down. A control valve is disposed to be offset laterally, and is provided on the side of the mission case opposite to the direction of deviation for supplying and discharging hydraulic fluid to the hydraulic actuator. The operating shaft that protrudes to the side and the left and right center portions of the top surface of the center float are interlocked by a bend-molded linking rod, and the machine adjusts the set height from the rice field based on the vertical movement of the machine relative to the center float that follows the ground contact with the rice field. The wheels are driven up and down by a hydraulic actuator to maintain the position of the vehicle, and the functions and effects thereof are as follows.

[For production]

If the mission case is shifted to the left or right as described above, the mission case (
1) The control valve (14
) between the operating shaft (14a) (see Figure 3) and the left and right center portions of the upper surface of the center float (9).
28), the connecting rod (
28) is less likely to bypass the side of the mission case (1) or other devices. In other words, the connecting rod (28
) The length (L) of the lower end horizontal portion (28a) is shorter than that of the conventional structure, and its corner portion (28b) approaches the left and right center portions of the center float (9).

Therefore, even if the aircraft moves violently up and down with respect to the center float (9) and force is applied to the connection point of the link rod (28) with the center float (9), the link rod (28)
The bending moment applied to the corner portion (28b) is reduced by the shorter length (L) of the horizontal portion (28a) of 28).

This makes it difficult for the linked rod (28) to be elastically deformed.

〔Effect of the invention〕

As described above, even if the linking rod that interlocks and connects the center float and the control valve is bent to bypass other devices, the elastic deformation of the link rod can be suppressed, and the The vertical movement of the aircraft is now accurately transmitted to the control valves. This made it possible to improve the accuracy of the operation of moving the wheels up and down to maintain the aircraft at a set height above the rice field.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 8, the transmission case for driving (1)
A pair of transmission cases (2) are located on both the left and right sides of the horizontal axis (Pl
), and this transmission case (2
) has running wheels (3a) at the end.

(3b) is provided to support the aircraft. and,
The rear of the aircraft is equipped with a seedling planting device consisting of a planting arm (4), a seedling stand (5), etc., a control handle (6), and a planting case (1) and a planting arm (5). 4
) is provided with a tank (7) and a feeding device (8) for feeding out the fertilizer in the tank (7).

At the bottom of the fuselage, a center float (9) can freely swing up and down around the horizontal axis (P2) at the rear of the fuselage, and around the longitudinal axis (P2).
3) It is attached so that it can be rolled around. A groove maker (10) that makes a groove in the rice field is fixed to this center float (9), and the fertilizer fed out from the feeding device (8) passes through the hose (11) to the groove maker (10). It is sent into the groove made by. As described above, a walking rice transplanter, which is an example of a walking rice paddy working machine, is constructed.

As shown in FIG. 8, a forward-sloping frame (13) is fixed to the front of the transmission case (1), and a gasoline engine (12) is mounted on this frame (13).
A gasoline engine (12) is supported in a forward downward tilting position.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be explained. As shown in Figure 1.7.8, a single-acting first hydraulic cylinder (
18) The rear ends of (corresponding to a hydraulic actuator) are connected, and this first hydraulic cylinder (18) is directed toward the rear of the fuselage. A support arm (20) is fixed to the tip of the piston rod (18a) of this first hydraulic cylinder (18), and a pair of upper and lower balance arms (21) are arranged around the vertical axis (P4) of this support arm (20). ) is attached so that it can swing freely. This balance arm (21) protrudes outward from the long holes (13a) on the left and right sides of the frame (13), and connects both ends of the balance arm (21) with the arm (2a) at the base of the transmission case (2). Across, a pair of left and right rods (
22) are constructed and connected. With the above structure, the first
When the hydraulic cylinder (18) is expanded or contracted, the left and right transmission cases (2) and wheels (3a) and (3b) are driven to swing up and down in the same direction.

Then, as shown in FIGS. 1 and 7, the support arm (2
0) and the bracket (
23) and a double-acting second hydraulic cylinder (24).
are connected by construction. With this structure, for example, when the second hydraulic cylinder (24) is extended, the left transmission case (2) and the wheels (3b) are driven to swing downward. In conjunction with this operation, the balance arm (21) is swung counterclockwise in FIG. 1 via the rod (22), and the right transmission case (2) and wheels (3a) are swung upwards. dynamically driven. In other words, the second hydraulic cylinder (24
), it is possible to vertically drive the left and right transmission cases (2) and wheels (3a) and (3b).

Further, as shown in FIGS. 1 and 7, a locking member (64) is attached around the vertical axis (P9) of the lower balance arm (21) so as to be swingable. In the state shown in FIG. 7, the left and right wheels (3a) are controlled by the second hydraulic cylinder (24).
), (3b) is in a state in which the contradictory vertical movement can be performed. Then, the locking member (64) is connected to the wire (65).
by swinging the pin (20a) of the support arm (20).
By engaging the lock member (64) in the first recess (64a), the left and right wheels (3a) and (3b) can be fixed in a position parallel to the fuselage. Also, pin (20a
) in the second recess (64b) or the third recess (64b) of the locking member (64).
By engaging the recess (64c), the left wheel (3
b) can be fixed in a lowered state, or the right wheel (3a) can be fixed in a lowered state.

In the above configuration, as shown in Figures 1 and 2, the mission case (1) is located at the front of the aircraft, and is offset to the left in Figure 2 from the left-right center (A) of the aircraft. It is arranged as follows. Then, place it on the opposite side of the mission case (1) from the left and right center (A) of the aircraft
The hydraulic cylinders (24) are arranged in parallel to the transmission case (1).

Next, the first and second hydraulic cylinders (18), (24
) for supplying and discharging hydraulic oil to the first and second control valves (14
), (15) and the linkage structure with the center float (9) will be explained. As shown in Fig. 1.2.3, a support bracket (16) is fixed to the front upper surface of the center float (9), and an operating arm (17) is fixed to this support bracket (16).

At the bottom of the front of the mission case (1) is the horizontal axis (P,).
A rod (19) that can only swing up and down is connected to the elongated hole (16a) of the support bracket (16) and the operating arm (17).
) is inserted across the first elongated hole (17a).

Further, a rod (25) fixed to the front surface of the mission case (1) is inserted into the first elongated hole (17a) of the operating arm (17). This allows the center float (9) to roll by the amount of the gap created between the left and right width of the first elongated hole (17a) and the rod (25).

On the other hand, in the upper part of the mission case (1), the first and second Control valves (14) and (15) are provided. In the first control valve (14), the operating shaft (
14a) protrudes in the lateral direction of the aircraft, and this operating shaft (14a)
An L-shaped operating section (26) is fixed to.

The swing arm (27) is swingable about a horizontal axis (P,) different from the operating shaft (14a) of the first control valve (14).
) is attached, and the center float (9) supporting bracket (16) is attached to the left and right center part of the center float (9) and the swing arm (
A connecting rod (28) bent into an L-shape is connected to the connecting rod (27). Further, the operating part (26) of the first control valve (14) is urged counterclockwise in FIG. 3 by the spring (29), and the bottle (26a) of the operating part (26) 27) from below.

With the above structure, when the aircraft moves up and down with respect to the center float (9) that follows the ground contact on the rice field, the connecting rod (2
8) and the first control valve (14) by the swing arm (27).
When the operation part (26) is operated, the left and right wheels (3a) and (3b) are driven to swing up and down by the first hydraulic cylinder (18) so that the machine body maintains the set height above the rice field. It is.

As will be described later, a main clutch (30) (see Fig. 5) is housed inside the mission case (1), and a clutch 7-m (3) for important operations is installed in the main clutch (30).
1) and the clutch lever (32) of the control handle (6) shown in FIG. 8 are connected to the wire (33) as shown in FIG.
, are interlocked and connected via a restraining member (34) and a link (35) which are swingable around the horizontal axis (P,).

Then, when the clutch lever (32) is operated and fixed in the clutch disengaged position, the check member (34) is moved to the wire (33).
) is fixed in the position shown in FIG. When the main clutch (30) is disengaged in this manner, the aircraft body falls forward and the grounded center float (9) is pushed upward. In this case, the swing arm (27
) is provided in the bottle (27a) as a check member (34)
The swing arm (27) and the first control valve (14) are stopped at the neutral stop position by contacting the arm (34a).

Further, an L-shaped operating arm (53) shown in FIG. 3 is linked to an operating lever (not shown) via a wire (66). That is, by operating the operating lever, the first control valve (14) can be forcibly operated to the lowering side of the wheels (3a) and (3b) via the operating section (26) by the operating arm (53).

As shown in Figures 2 and 3, the mission case (1
) A hellcrank (39) is swingably attached around the horizontal axis (pa) on the front surface, and the bottle (39a) of this hellcrank (39) is connected to the second elongated hole (17) of the operating arm (17).
b) is involved. The operating portion (, 15a) of the second control valve (15) and the hell crank (39) are interlocked and connected via a linkage iron F (40).

With the above structure, when the aircraft tilts left and right with respect to the center float (9) that follows the ground contact on the rice field, the operation arm (17), hell crank (39)
The second control valve (15) is operated via the second hydraulic cylinder (2) so that the machine body is horizontally parallel to the rice field.
4) causes the left and right wheels (3a) and (3b) to swing in a contradictory manner.

Next, the structure inside the mission case (1) will be explained. As shown in FIGS. 5 and 6, power from the gasoline engine (12) is transmitted to the input pulley (36) of the transmission case (1) via a transmission belt (not shown), and the input gear ( 37). This input gear (37) is externally fitted to the first transmission shaft (38) so as to be relatively rotatable, and the shift gear (41) is slidably externally fitted to the first transmission shaft (38) with a spline structure. By engaging and separating the input gear (37), the main clutch (30
). The shift gear (41) is then slid by the clutch arm (31) shown in FIGS. 2 and 3.

From the side opposite to the side where the mission case (1) is deviated from the left and right center (A) of the aircraft (the left side in Fig. 5), the first power transmission shaft (38) and the second power transmission shaft (42) are connected. are protruding, and the first and second transmission shafts (38) and (42)
A first gear (43) and a second gear (44) are attached to the protruding end of the gear. The power of the second transmission shaft (42) is transmitted to the planting arm (4) and the seedling stand (5) via the shift gear (45), the third transmission shaft (46), and the fourth transmission shaft (47).
etc. will be transmitted.

A shift gear (49) is slidably fitted onto the fifth transmission shaft (48) with a spline structure.

This allows the shift gear (49) to be connected to the first transmission shaft (38).
When the shift gear (49) is engaged with the shift gear (41), the power is transferred to the side clutch (51) and the axle (52). and left and right wheels (3a) via a chain (not shown) in the transmission case (2),
(3b). Then, by engaging the shift gear (49) with the fourth gear (54) of the second transmission shaft (42), the wheels (3a), (3
b).

In this case, open the cover (56) and gear the first and second gears (
43) and (44), but the first.
5.8 As shown in figure 1, the first and second gears (43) (44
), the cover (56) is located high above the rice field, and the mission case (1) is deviated to one side from the left-right center (A) of the aircraft, causing the cover (56) and transmission case (2) to be separated from each other. The first and second gears (43) and (44) can be easily replaced because of the wide distance between them and the wheels (3b).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the walking type paddy field work machine according to the present invention,
Fig. 1 is a plan view of the mission case and the vicinity of the first and second hydraulic cylinders, Fig. 2 is a front view showing the linkage structure between the first and second control valves and the center float, and Fig. 3 is a plan view of the transmission case and the vicinity of the first and second hydraulic cylinders. Figure 4 is a side view showing the linkage structure between the control valve 2 and the center float, Figure 4 is a side view of the vicinity of the swing arm when the main clutch is disengaged and operated, Figure 5 is a longitudinal rear view of the transmission case, 6 is a schematic longitudinal side view of the mission case, FIG. 7 is a plan view of the support arm and the vicinity of the second hydraulic cylinder, and FIG. 8 is an overall side view of the walking rice transplanter. (1)...Mission case, (3a),
(3b)... Wheels, (9)... Center float, (14)... Control valve, (14
a)... Control valve operating shaft, (18)...
・Hydraulic actuator, (28)... Linking rod, (A)... Left and right center of the fuselage.

Claims (1)

[Claims] A hydraulic actuator (18) that drives the left and right pair of running wheels (3a) and (3b) up and down, and a center float (9) that is attached to the left and right center of the lower part of the aircraft so that it can move up and down.
) and a transmission case for driving (1)
The hydraulic actuator (18) is arranged to be offset to one side laterally from the left-right center (A) of the aircraft body, and the hydraulic actuator (18) is disposed on the side opposite to the direction of deviation of the mission case (1).
A control valve (14) for supplying and discharging hydraulic oil is provided in the control valve (14).
) and the left and right center portions of the upper surface of the center float (9) are interlocked by a bend-formed linking rod (28), so that the aircraft can move from the rice field based on the vertical movement of the aircraft relative to the center float (9) that follows the ground contact with the rice field. The wheels (3a) are moved by the hydraulic actuator (18) to maintain the set height.
), (3b) is configured to drive vertically.