JPH04271709A - Stand device for walking rice transplanter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand device for a walking rice transplanter.

0002

2. Description of the Related Art Conventionally, in walk-behind agricultural machines such as tillers and management machines in which the left and right wheels do not move up and down, there have been some that have stand devices attached to the front side of the left and right wheels.

0003

[Problem to be Solved by the Invention] Generally speaking, walk-behind rice transplanters, unlike tillers or management machines, are capable of raising and lowering the wheels that are in contact with the ground in order to change the height of the machine from the ground. ing. Therefore, the walking rice transplanter stands at an angle depending on the vertical position of the wheels. If the aircraft is tilted to a stand position, maintenance problems may occur, such as making it difficult to accurately check the oil level when replacing transmission oil while the aircraft is in a stand position.

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a walking rice transplanter equipped with a lifting means for changing the height of the machine body from the ground by lifting and lowering the left and right wheels 10, 10. In the stand device 38 that is attached to the front side of the wheels 10, 10, the stand device 38 is configured so that the aircraft body is approximately horizontal when the wheels 10, 10 are at the top of the lifting operation range in the stand state. It was used as a stand device for a walking rice transplanter.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. Reference numeral 1 in the figure is a traveling transmission case, to which an engine E is fixedly connected to the front part, and to the rear side surface thereof, the front end of a cylindrical frame 2 extending rearward is fixedly fixed. The front side of a planting transmission case 3 is fixed to the rear end of the frame 2, and the front end of a handle support frame 4, which extends rearward and obliquely upward, is fixed to the rear side of the planting transmission case 3. . The base of the operating handle 5 is attached to the upper end of the handle support frame 4.

A seedling planting tool 6 for four rows is attached to the planting transmission case 2 with a rotating crank and a swinging arm, and the seedlings are separated and held one by one from the seedling stand 7 and transferred to the field. It works like planting. In addition, a seedling mounting stand 7 is connected to both ends of a reciprocating rod 8 which protrudes left and right from the planting transmission case 2 and moves back and forth left and right, with connecting members 9, and the seedling mounting tool 6
The seedling platform 7 reciprocates left and right in accordance with the planting operation. The seedling stand 7 has an upper support 7a fixed to the upper part of the handle support frame 4, and a seedling support frame 7c having an L-shape in side view for receiving the lower side of the seedlings placed on the seedling stand 50. It is supported by an integrally formed lower support 7b so as to be slidable left and right. The seedling support frame 7c is provided with a seedling dividing opening 7c' through which the seedling separation body of the seedling planting tool 6 passes.

Reference numerals 10 and 10 denote a pair of wheels provided on the left and right sides. The wheels 10, 10 have bosses 11, 1 that wrap around a travel drive shaft that protrudes on both left and right sides of the travel transmission case 1.
It is pivotally supported by the rear ends of transmission chain cases 12, 12 attached to the transmission chain case 1, and is provided so as to be able to swing up and down while being rotated by transmission. Reference numerals 13 and 13 designate arms that are integrally fixed to bosses 11 and 11 that are integral with the transmission chain cases 12 and 12, respectively.

Reference numeral 14 is a hydraulic cylinder that moves the wheels 10, 10 up and down. The base of this hydraulic cylinder 14 is connected to a hydraulic case 15 fixed on the traveling transmission case 1.
The rear end of the piston 14a of the hydraulic cylinder 14 is rotatably pivoted around a vertical axis 17 at the left and right center portions of a balance device 16 whose front ends are connected to the upper ends of the arms 13, 13. , the wheels 10, 10 are configured to move up and down in a contradictory manner.

The balance device 16 includes a balance body 18 whose left and right center portions are rotatably supported by a vertical shaft 17 at the tip of a piston 14a, and vertical shafts 19, 1 on both left and right sides of the balance body 18.
It is composed of connecting rods 20, 20 rotatably connected at 9. The right connecting rod 20 is rotatably connected directly to the right arm 13, but the left connecting rod 20 is provided with a hydraulic cylinder 21 for rolling operation in the middle of the piston 21a. It is configured such that the connection length can be changed by moving in and out of the hydraulic cylinder 21.

Reference numeral 22 denotes a central leveling float attached to the lower center of the fuselage, and 23a and 23b are left and right leveling floats installed on both left and right sides of the float, each with its rear end connected to a support shaft 24...
The front part is connected by a floating connecting member 25 having a long hole 25a, and is supported to be able to swing up and down within a swinging range h. The central ground leveling float 22 also operates as a sensor float of a lifting control means that lifts and lowers the pair of left and right wheels 10, 10 to maintain a constant height of the aircraft from the ground. That is, the lever 26a for switching the spool of the lift control hydraulic valve 26 provided in the hydraulic case 15 and the front upper surface of the central leveling float 22 are connected to the rod 2.
They are connected at 7. When the front part of the central grading float (sensor float) 22 moves upward beyond the proper range, the hydraulic valve 26 transfers the pressure oil pumped out from inside the traveling transmission case 1 by the hydraulic pump 28 into the hydraulic cylinder 14 into the piston 14a. The piston 14a is pushed out, and the left and right arms 13, 13 are pulled rearward via the connecting rods 20, 20 without the balance body 18 tilting, and the transmission chain cases 12, 12 are As it rotates, the left and right wheels 10, 10 attempt to descend to the same height at the same time, and the aircraft relatively rises by that amount. On the other hand, when the front part of the central leveling float 22 moves down beyond the proper range, the hydraulic valve 26 switches to feed pressure oil into the hydraulic cylinder 14 so that the piston 14a is retracted, and the piston 14a is retracted and the balance is removed. When the body 18 is not tilted, the connecting rods 20, 20
The left and right arms 13, 13 are returned to the front via the
0 will rise to the same height at the same time and the aircraft will descend accordingly.

Reference numeral 29 is a horizontal sensor that detects the horizontal inclination of the aircraft body with respect to the horizontal plane. In this sensor 29, the upper end of a swinging arm 29b having a weight 29a fixed to its lower end is swingably suspended from a pivot shaft in the front-rear direction, and the swinging arm 29b moves left and right as the aircraft tilts left and right. It is a pendulum type sensor configured to be able to swing. This horizontal sensor 29
The middle part of the swinging arm 29b and the tip of the spool of the rolling control hydraulic valve 30 are connected by a pivot pin, and the spool of the rolling control hydraulic valve 30 is switched by the left and right swinging of the swinging arm 29b. It is configured so that When the aircraft is tilted so that the left side is lower and the right side is higher with respect to the horizontal plane, the spool is pushed by the swing arm 29b, and the hydraulic valve 30 is connected to the rolling hydraulic cylinder 2.
The piston 21a of No. 1 switches to retract, the connection length between the left balance body 18 and the arm 13 becomes shorter, the left wheel 10 moves downward, and the lowered left side rises, making the aircraft horizontal horizontally. Return. Conversely, when the aircraft tilts so that the right side is lower and the left side is higher, the spool is pulled by the swing arm 29b, the hydraulic valve 30 is switched so that the piston 21a of the rolling hydraulic cylinder 21 protrudes, and the left balance body is 18 and the arm 13 becomes longer, the left wheel 10 moves upward, the raised left side descends, and the aircraft returns to the left-right horizontal state.

Reference numeral 31 denotes a transmission shaft, which is provided to transmit power from the traveling transmission case 1 to the planting transmission case 2. 32 is the main gear shift lever, which controls road speed, reverse,
Can shift between neutral and working speed. 33 is a main clutch lever, and 34 is a clutch lever for lifting and lowering the aircraft and for planting. 3
5 is a recoil knob for starting the engine, 36 is a spare seedling stand, and 37 is a bonnet that covers the top of the aircraft.

38 is a stand device. This stand device 38 is attached to both left and right sides of a pedestal member 39 that receives and is fixed to the bottom of the engine E and the traveling transmission case 1 located in front of the wheels 10, 10. That is, as shown in FIGS. 4 and 5, connecting plates 4 are attached to both ends of a stand member 40 made of pipe material formed into a loop shape.
0a and 40a are each integrally fixed, and rotating cylinders 40b and 40b are integrally fixed to each of the connecting plates. With the rotation tubes 40b, 40b fitted to the rotation shafts 41a, 41a fixed to the brackets 41, 41, the brackets 41, 41 are fixed to the left and right sides of the base member 39 with bolts, respectively. In this way, the stand member 40 has rotational shafts 41a, 41
It is attached to the aircraft so that it can rotate around a. Furthermore, the connecting plate 40 integrated with the stand member 40
A spring 42 is hung between pins 40c, 40c fixed to pins 40c, 40a, and pins 1a, 1a protruding from the left and right sides of the transmission case 1. Further, stand-side stopper pins 41b, 41b and storage-side stopper pins 41c, 41c are fixedly fixed to the brackets 41, 41 so as to protrude left and right. As a result, when the stand member 40 is rotated upward or downward, the rotation direction in which the spring 42 moves beyond the fulcrum and urges the stand member 40 is switched. That is, there is a stand state in which the stand member 40 is rotated downward to a position where it contacts the stand side stopper pins 41b, 41b, and a stand state in which the stand member 40 is rotated downward to a position where it contacts the stand side stopper pins 41b, 41b.
0 is rotated upward to a position where it contacts the storage side stopper pins 41c, 41c, and can be switched to a stand storage state. Note that the shape of the stand member 40 may be an L-shaped member instead of a loop shape.

This stand device 38 includes the stand member 4
When the rice transplanter 0 is rotated upward and placed in the stored state, the stand member 40 is located at the tip of the rice transplanter, and the bumper on the rice transplanter body is
It is designed to function as a When the stand member 40 is rotated downward to switch to the stand state, the stand member 40 goes around below the central earth leveling float 22 and comes into contact with the ground. The center of gravity of the aircraft body is placed in a triangle connecting the grounding point of the stand member 40 and the grounding points of the left and right wheels 10, 10 in a plan view, so that the aircraft body is supported on the stand.

While the stand device 38 is in the stand state, the machine is lowered by operating the machine lifting/planting clutch lever 34, and the wheels 10, 10 are moved to the highest position WLmax in the lifting/lowering operation range S. When the aircraft is placed in a horizontal position, the aircraft stands approximately horizontally. This allows the aircraft to stand stably in a horizontal position for a long period of time without lowering the aircraft further due to its own weight after the engine has stopped (Figure 6).

[0016]Furthermore, the aircraft stands horizontally even if it is in the left-right direction (FIG. 7). Here, in the stand member 40,
A point grounding tool 43 as shown in FIG. 8 is loosely fitted into the stand device 38.
If it is in a stand position and in a point contact state, it can be used as a fulcrum when adjusting the rolling of the aircraft in the left and right directions. The point contacting tool 43 switches to a normal stand specification by sliding and rotating its protrusion upward.

Furthermore, when the stand device 38 is in the stand state, the swing range h of the front part of the sensor float 22 is
is not restricted by the stand device 38, and the sensor float 22 is placed on the stand in a state where it is in contact with the ground and does not move upward. This prevents the aircraft from suddenly performing lift control (FIGS. 4, 5, and 6). Furthermore, while in the stand state, operate the machine lifting/planting clutch lever 34 to raise the machine, and the wheels 10,
Even when the float 22 is moved to the lowest point WLmin of its lifting/lowering operation range S and the aircraft is tilted forward, the float 22
The front part of the machine is also designed not to touch the ground. At this time, if the machine lifting/planting clutch lever 34 is operated to the position where vertical movement is fixed, the machine will be stably held in a greatly tilted forward state, improving the maintainability of the bottom side of the machine (
Figure 9).

As shown in FIG. 10, the stand device 38 switches from the stand state to the stowed state when the planting clutch is operated from "off" to "on" using the machine lifting/planting clutch lever 34. By linking with , it is possible to prevent the aircraft from traveling while planting plants while in the stand state. That is, the rotating arm 34a at the base of the lever 34 and the interlocking arm 40b' fixed to the rotating tube 40b of the stand device 38 are connected by a wire 44, and the planting clutch lever 34
When the planting clutch is operated from "off" to "on", the interlocking arm 40b' of the stand device 38 is rotated to rotate the stand member 40 upward via the wire 42. Then, the stand device 38 in the stand state is switched to the storage state. The lever interlocked in this manner may be the main clutch lever 33 or may be a separately provided traveling clutch lever. 45 is a spring.

Furthermore, as shown in FIG. 11, when the stand device 38 is operated so that the lever state of the main shift lever 32 returns to the "neutral" position when switching from the stowed state to the stand state, the This prevents the vehicle from running unexpectedly while in the stand position. That is, the main shift lever 32
The gear shift operation is performed by rotation of a shift operation shaft 32a around the axis, and rods 32b, 32b that intersect with the axis direction are fixed to the shift operation shaft 32a. On the other hand, a neutral return operating arm 46 is provided which rotates the rods 32b, 32b to predetermined positions and returns to the neutral state, and the operating arm 46 and the rotating cylinder 4 of the stand device 38 are provided.
An interlocking arm 40b" fixed to the 0b is connected by a wire 47. When the stand member 40 of the stand device 38 is rotated downward to switch to the stand state, the interlocking arm 40b" is rotated and the wire 47 is connected to the interlocking arm 40b''. The neutral return operation arm 46 is interlocked therewith, and rotates the rods 32b, 32b to a predetermined position, thereby returning the speed change to the neutral state. 48 and 49 are springs.

[0020] Above, an embodiment has been described in which switching between stand and storage of the stand device 38 is manually operated.
Stand device 3 is provided with a separate operating lever on the handle 5 side.
8 with a wire so that switching between the stand state and the stored state can be operated using the lever.

[0021]

Effects of the Invention In a walk-behind rice transplanter equipped with a lifting means for changing the height of the machine body from the ground by lifting and lowering the left and right wheels 10, 10, the wheels 10, 10 are raised and lowered with the stand device 38 in a stand state. Since the aircraft is configured so that it is approximately horizontal when it is at the top of its operating range, the aircraft can stand stably in a horizontal position for a long period of time without any further lowering due to its own weight after the engine stops, and the mission oil is This improves maintenance by allowing you to always accurately check the oil level when replacing oil.

[Brief explanation of the drawing]

FIG. 1 is a side view of a walking rice transplanter (stored in the stand).

FIG. 2 is a plan view of the walking rice transplanter (with the bonnet removed).

FIG. 3 is a hydraulic circuit diagram showing an elevation control mechanism.

FIG. 4 is a side view of the stand device.

FIG. 5 is a front view of the stand device.

FIG. 6 is a side view of the rice transplanter in a stand state.

FIG. 7 is a front view of the rice transplanter in a stand state.

FIG. 8 is a front view of the rice transplanter with the stand device in a point-grounded state.

FIG. 9 is a side view of the rice transplanter when the wheels are lowered to the lowest position in a stand state.

FIG. 10 is a side view showing the interlocking relationship between the stand device and the planting clutch lever.

FIG. 11 is a side view showing the interlocking of the stand device and the main shift lever.

[Explanation of symbols]

10, 10: Wheel 22: Central float 38: Stand device 40: Stand member

Claims (1)

[Claims] 1. A stand device 38 that is attached to the front side of the wheels 10, 10 of a walk-behind rice transplanter, which is equipped with a lifting means for raising and lowering the left and right wheels 10, 10 to change the height of the machine body above the ground. The stand device 38 is a stand device for a walk-behind rice transplanter that is configured so that the machine body becomes approximately horizontal when the wheels 10, 10 are at the top of the lifting/lowering operation range in the stand state.