JPH0551246B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides rice planting on a walking-controlled traveling vehicle body having a pair of left and right rice paddy wheels and a ground float that floats on the topsoil surface of the paddy field and supports part of the vehicle load. The present invention relates to a traveling device for a walking-type paddy field agricultural machine equipped with a device and a seeding device.

BACKGROUND OF THE INVENTION Conventionally, there has been a technology disclosed in Japanese Patent Publication No. 58-22162 regarding a rice transplanter, which is an example of a walking-type paddy field farming machine. In this conventional technology, the rice field wheels located on both the left and right sides of the aircraft are linked with a balance rod.
The tilting of this balance rod is controlled by a hydraulic cylinder device, and the hydraulic switching valve for this control is controlled by a ground float attached via the balance so that it can rotate left and right, and the aircraft is held horizontally horizontally. It was from.

Problems to be Solved by the Invention In the prior art described above, in order to hold the machine body horizontally, the tilting of the balance rod was controlled from the machine body side using a hydraulic cylinder device. The balance rod will not tilt unless the hydraulic cylinder device is controlled to extend or contract in response to plate movement, and for this reason, during the time lag of the hydraulic cylinder device's operation, it is difficult for the aircraft to become horizontal from side to side.
Since the balance rod receives tilting control from the aircraft body, the control shock is directly transmitted to the aircraft body, making it impossible to run smoothly.

Means for Solving the Problems The present invention takes the following technical means to solve the problems of the conventional device described above.

That is, the present invention provides chain cases 9, 9, which are mounted on both left and right sides of the fuselage 1, with the base side pivoted and the paddy wheels 10, 10 mounted on the tip side so as to be rotated by transmission.
The left and right end sides of a balance rod 26 whose left and right center positions are pivotally connected to the piston 25b of a first hydraulic cylinder device 25 which is rotatably installed in the left and right center portions of the fuselage 1 in the longitudinal direction, and Chain case 9,9
A second hydraulic cylinder device 30 is provided in one of the interlocking members 29a, and a second hydraulic cylinder device 30 is provided in one of the interlocking members 29a, and the first hydraulic A first hydraulic switching valve 23 that controls the cylinder device 25
The second hydraulic pressure switching valve 24 for controlling the second hydraulic cylinder device 30 is located outside the left and right paddy wheels. This is a configuration of a traveling device for a walking type paddy field working machine which is controlled by switching based on the vertical movement of the side grounding floats 18, 18.

Effects of the Invention This invention uses the above-mentioned technical means to control the lifting and lowering of the machine body according to the depth of the tiller, and even if the tiller is tilted to the left or right or there are different unevenness on the left and right sides, the machine body can be moved up and down according to the depth of the tiller. It goes without saying that the levers are held in a substantially horizontal state on the left and right sides, and in order to be controlled in a substantially horizontal state on the left and right sides, the balance rods are held in the left and right paddy fields even while the second hydraulic cylinder device is being controlled. If there is a difference in the aircraft support capacity of the wheels, the wheels can tilt freely to maintain the aircraft in a horizontal position. In this case, most of the control shock of the second hydraulic cylinder device can be absorbed only between the left and right horizontal wheels, and there is an effect that smooth running can be achieved without unnecessarily vibrating the aircraft body.

Embodiment A walking rice transplanter which is an embodiment of the present invention will be described in detail based on the drawings.

Reference numeral 1 denotes a fuselage body, in which an engine stand 3 is attached to the front side of a traveling gearbox 2, a connecting frame 4 is attached to the rear part, and a planting gearbox 5 is attached to the rear end. 6 is an engine, 7 is a fuel tank, and 8 is a bonnet. Reference numerals 9 and 9 designate a pair of left and right chain cases, the base of which is integrally attached to a rotatable metal member that is pivotally connected to the boss that surrounds the drive shaft that protrudes from both left and right sides of the traveling gear box 2; Paddy wheels 10, 10 are supported on the outside to allow vertical movement.

Reference numeral 11 denotes a control handle, the base side of which is attached to the planting gear box 5, and the tip side thereof extended rearward and upward.

Reference numeral 12 denotes a seedling tank, which is supported on the upper side of the control handle 11 so as to be able to move laterally, and is connected to a left and right reciprocating mechanism in the planting gear box 5 by a moving rod 13a and a metal fitting 13.
b and is provided so as to be able to reciprocate.

Reference numeral 14 denotes a seedling planting tool, which is attached to the planting gear box 5 by a crank and a swing arm, and is provided to divide and plant seedlings from the seedling tank 12.

Reference numeral 15 denotes a center grounding float, which is arranged to extend in the front and back direction between the left and right paddy wheels 10, 10, and whose rear part is pivoted by a horizontal support shaft 16 fixed to a handle mounting bracket. The front part is attached to the engine stand 3 with a link 17 that can be expanded and contracted up and down.

Reference numerals 18 and 18 denote side grounding floats, which are disposed on the outside of the left and right paddy wheels 10, 10, with their rear parts pivotally connected to the spindle 16, and their front parts connected to the chain case 9,
The base is fixed to the rotation axis on the outside of the shaft 9, extends outward, and is attached to the support rods 19, 19 via links 20, 20 so as to be vertically movable.

21 is a hydraulic pump 22 and a first hydraulic switching valve 2
3 and a second hydraulic switching valve 24, and is attached to the upper side of the traveling gear box 2. 23a indicates a switching arm for switching the first hydraulic pressure, and 24a indicates a switching arm for switching the second hydraulic pressure.

25 is a first hydraulic cylinder device, a cylinder 25a is integrally attached to the hydraulic case 21,
The piston 25b is attached so as to protrude rearward. 26 is a balance rod, and the piston 25b
The left and right center portions are freely rotatably attached to the tips of the holder with vertical pins 27.

Reference numerals 28, 28 are protruding arms integral with the metal to which the chain cases 9, 9 are pivotally attached.

29a and 29b are interlocking members, and the lever 26
A second hydraulic cylinder device 30 is provided in the left and right interlocking members 29a of the interlocking members.
is interposed.

That is, the cylinder 30a side of the second hydraulic cylinder device 30 is fixed to a connecting rod whose base is pivotally connected to the left protrusion arm 28, and the piston 30b side is pivotally connected to the left end of the balance rod 26.

31 is a rod that connects the central grounding float 15;
and the switching arm 23 of the first hydraulic switching valve 23.
When the float 15 moves upward from a position within the vertical range appropriate for rice transplanting work, the piston 25b of the first hydraulic cylinder device 25 is projected, and conversely, when the float 15 moves downward from the appropriate range, the piston 25b is configured to retract.

32a and 32b are release wires consisting of an outer wire and an inner wire,
This wire 32a connects the left side ground float 18 and the switching arm 2 of the second hydraulic switching valve 24.
4a, and the wire 32b connects the right side grounding float 18 and the switching arm 25a. And left and right side grounding floats 18,
When the vertical heights of the floats 18 and 18 are the same, the second hydraulic switching valve 24 is set to be neutral.
When the vertical heights of the fuselage 8 are different, the piston 30b of the second hydraulic cylinder device 30 is moved in and out to return the horizontal tilt of the fuselage 1 to a horizontal state.

In addition, the symbols 33 in Fig. 3 are hydraulic tanks, and 34
indicates a relief valve.

Next, to explain the operation of the above example, after the rice transplanter is put into the paddy field, the seedlings are placed and stored in the seedling tank 12, and then the engine 6 drives each rotating part. Then, the body 1 is propelled by the rotation of the paddy wheels 10, 10, and each of the grounding floats 15, 18, 18 lands on the top soil of the paddy field and slides. In addition, seedling planting tools 14, 14...
Seedlings are divided one by one from a seedling tank 12 that moves back and forth horizontally from side to side and are successively planted into the top soil of the paddy field.

During such work, if the plowing surface of the paddy field is deep from the topsoil surface, each grounding float 15, 18,
The front part of No. 18 moves upward as the ground pressure on the topsoil surface increases. At this time, the upward movement of the central grounding float 15 rotates the switching arm 23a upward via the rod 31, causing the piston 25b of the first hydraulic cylinder device 25 to protrude, and the balance rod 26 and interlocking member 2
The paddy wheels 10, 10 are moved downward via the protruding arms 28, 28, and chain cases 9, 9, and the ground pressure of each ground float 15, 18, 18 is controlled to be an appropriate pressure. Conversely, when the plow surface becomes shallow, each of the grounding floats 15, 18, 18 hangs from the machine body 1 and moves downward to the point where the distance from the machine body 1 becomes too large. 1 Piston 2 of hydraulic cylinder device 25
5b is retracted, the first hydraulic switching valve 23 is switched, and the paddy wheels 10, 10 are switched under the weight of the aircraft body.
is moved upward, and the grounding pressure of each grounding float 15, 18, 18 is controlled to be an appropriate pressure.

Next, if the tiller surface is fluctuating in the left-right direction, or if the tiller surface on either side is uneven and the machine body 1 is tilting to the left or right, then naturally the left and right side grounding floats 1
The front parts of 8 and 18 will change vertically with respect to the fuselage 1. For example, when tilting to the left, the left ground float 18 is pushed upward and the right ground float 18 is suspended downward. Therefore, the inner wire of the wire 32a becomes loose,
Conversely, the inner wire of the wire 32b becomes tense. Therefore, the switching arm 24a is rotated to the right in a plan view, and the piston 30 of the second hydraulic cylinder device 30 is rotated to extend the left interlocking member 29a.
b is projected, and the left wheel 10 is controlled to move downward. Conversely, when the aircraft 1 tilts to the right, the second hydraulic switching valve 24 is switched so that the piston 30b retracts, and even if the tilting of the balance rod 26 does not move accurately, this is switched to the second hydraulic cylinder. The device 30 compensates for this and always controls the aircraft 1 so that it does not tilt to the left or right.

During this control, the balance rod 26 is kept free to rotate without being restricted by the aircraft 1 side, so the aircraft 1 is not unnecessarily vibrated and the aircraft 1 is propelled smoothly. become.

[Brief explanation of the drawing]

The figures show a traveling type rice transplanter according to an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a partially omitted plan view, and FIG. 3 is a hydraulic circuit diagram. Symbols in the diagram: 1 is the aircraft body, 9 is the chain case, 10
is a paddy wheel, 15 is a center grounding float, 18 is a side grounding float, 23 is a first hydraulic switching valve,
24 is a second hydraulic switching valve, 25 is a first hydraulic cylinder device, 25b is a piston, 26 is a balance rod,
28 is a protruding arm, 29a and 29b are interlocking members,
30 indicates a second hydraulic cylinder device.

Claims (1)

[Claims] 1. Chain cases 9, 9 are rotatably provided on both the left and right sides of the fuselage 1, and the base side is pivotally mounted and the paddy wheels 10, 10 are mounted on the tip side so as to be rotated by transmission. A protruding arm 28 is integrally attached to the left and right end sides of a balance rod 26 whose left and right center positions are pivoted to the piston 25b of the first hydraulic cylinder device 25 installed horizontally in the front-rear direction, and to the left and right chain cases 9, 9. . The switching valve 23 is switched and controlled by the vertical movement of the central grounding float 15 located between the left and right paddy wheels, and the second hydraulic switching valve 24 that controls the second hydraulic cylinder device 30 is switched between the outsides of the left and right paddy wheels. A traveling device for a walking type paddy field working machine which is controlled by switching based on the vertical movement of side grounding floats 18, 18 located at.