JPH0256041B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) This invention is used for agricultural machinery for paddy fields, such as rice transplanters and sowing machines, which work on many wide rows in one stroke in paddy fields. Inside, the work equipment is moved up and down using the center float as a reference to maintain a uniform working depth, and when turning, the work equipment is raised using the end float as a reference to prevent mud from being pushed by the sides of the float. The purpose is to

(Prior Art) A rice paddy agricultural machine for planting rice, sowing seeds, etc. in a paddy field uses means for moving the machine part up and down with reference to a float that slides on a mud surface. There are two types of work equipment: one that moves up and down at the rear of the vehicle body, and one that is built integrally with the vehicle body.The former moves only the work equipment up and down, and the latter uses wheels The working machine part is raised and lowered by raising and lowering.

(Problem to be solved by the invention) In order to save labor, wide machines that can work on multiple strips in one stroke have come to be used, and the working machine section is moved up and down based on a central float. Here,
To improve efficiency, if you make a U-turn at the edge of the field without raising the work equipment, centrifugal force will cause the work equipment to tilt left and right and turn, causing the lower side of the float to push away the mud.

As seen in Japanese Patent Application Laid-open No. 55-141111, a method has been proposed in which two floats on the left and right are used so that when either float rises, the working machine section rises as a means to eliminate this muddying. However, if you do this, for example, if the right float rides on a lump of soil on the right while you are working straight ahead, the work equipment may go up and become shallowly planted, or the work equipment may go up and down frequently, causing a hunting phenomenon. Due to the drawbacks that occur, it is not put into practical use.

(Means for solving the problems) In order to solve these problems, this invention
The following method was used.

That is, a working machine part 17 that moves up and down with respect to the mud surface by the lifting mechanism 9, and floats 21 and 22 that are provided under this working machine part 17 and slide on the mud surface as the working machine part 17 moves forward. , 23, this float has a center float 21 and left and right floats 2.
2, 23... are arranged side by side in odd numbers, each of which is provided to move up and down independently with respect to the working machine section 17, and includes an elevating mechanism 9, a float 21,
22, 23... means a plurality of floats 21, 22,
When one of the floats 23... approaches the work machine section 17 side, the work machine section 17 rises from the mud surface, and when all the floats 21, 22, 23... move away from the work machine section 17, the work machine section 17 rises from the mud surface. The center float 21 is connected to the side floats 2.
2, 23... A lifting device for a working machine part in an agricultural working machine for paddy fields, characterized in that it is connected to a lifting mechanism 9 so as to raise the working machine part 17 when approaching the working machine part 17 less than 2, 23... And so.

(Function) Since the present invention is configured as described above, the working machine section 17, which performs work while sliding the floats 21, 22, and 23 on the mud surface, can move between the tiller A and the mud surface B. If the depth changes, for example, if you descend too far and get too close to the mud surface B, the float 2
1, 22, and 23 will be coming soon. Then, the lifting mechanism 9 is activated to raise the working machine part 17, and while the working machine part 17 is kept at a constant height with respect to the mud surface B, work such as transplanting or sowing of seedlings is performed at a predetermined depth. .
On the contrary, if the work machine part 17 is too high above the mud surface B, the work machine part 17 and the floats 21, 22, 2
3 is too far apart, the elevating mechanism 9 operates to lower the working machine section 17 and control the working machine section 17 to a predetermined height with respect to the mud surface B.

For this control, a plurality of floats 21, 22,
23 independently move up and down with respect to the work equipment section 17, and the center float 21 acts preferentially on the lifting mechanism 9, so the work equipment section 17 moves up and down with respect to the center float 21. Move to.

Furthermore, when this paddy field agricultural machine comes to the edge of the field, the operation of the planting device and sowing device is stopped, and the machine makes a U-turn without raising the working machine section 17 to improve work efficiency. Then, the paddy field agricultural machine or work machine part 1
7 tilts laterally due to the centrifugal force and turns, but due to the inclination of the working machine part 17, the float 22 or 23 on the lower side tends to be pushed deeper into the mud surface, and this float 22 or 23 becomes difficult to work. Approach the machine part 17, activate the lifting mechanism 9, and pull it up.

(Effect) That is, according to the present invention, when the paddy field agricultural machine is working while moving straight, the working machine part 17 moves up and down with respect to the central float 21, thereby adjusting the transplanting depth and sowing depth. Aim to equalize working depth such as depth. Therefore, as seen in the invention of JP-A No. 55-141111, it is necessary to pick up an extremely high object on the mud surface and raise the working machine section 17 to plant it shallowly, or to move the working machine section 17 up and down frequently. There is no hunting phenomenon that occurs when the device is activated.

Also, when the paddy field work machine comes to the edge of the field and makes a U-turn, the work machine section 17 is lifted up based on the float on the lower side by tilting left and right, so the float 22 on the side of this lower side or There was no way to push the mud aside with the sides of the 23.

(Example) Next, embodiments of the invention will be described.

Reference numeral 1 in the drawing shows a running vehicle body, which has an engine covered by a bonnet 4 at the front of a frame on which front wheels 2, 2 and rear wheels 3, 3 are provided, and a steering wheel 5 and a seat 6 at the rear. ing.

The rear wheels 3, 3 are mounted on end portions of chain cases 8, 8 extending diagonally rearward and downward from the left and right sides of a transmission case 7 that constitutes the frame.

9 is a lifting mechanism, mainly the upper and lower links 1
2, 13 and a hydraulic cylinder 16. A column 11 is vertically fixed to a connecting rod 10 connecting the chain cases 8, 8, one end of the upper and lower links 12, 13 is rotatably attached to this column 11, and the other end is rotatably attached to the vertical frame 14. mounted on. A hydraulic cylinder 16 is provided between an arm 15 fixed downward to one end of the upper link 12 and a transmission case 7. That is, the end of the cylinder 16a is attached to the mission case 7, the end of the piston rod 16b that protrudes from this is attached to the arm 15, and the protrusion of the piston rod 16b turns the arm 15 to raise the rear ends of the links 12, 13. It is composed of

17 is a working machine part, and the figure shows a rice transplanting device.
It may be a seeding device or a fertilizing device. A seedling stand 19 is installed on the machine frame 18, which also serves as a transmission case, so as to tilt forward and move back and forth from side to side. A plurality of seedling planting rods 20, 20, . . . that move on a track are provided. Moreover, an odd number of floats 21, 22, and 23 are provided below. These floats 21, 22, and 23 are composed of a central float 21 located in the center of the traveling vehicle body 1 and side floats 22, 23 located on the left and right sides of the central float 21, and the rear ends of each are connected to a pin 24, It is rotatably pivoted at 25 and 26, and supported by links 27, 28, and 29 such that the tip is suspended. That is, when the machine frame 18 moves up and down, the float 2
1, 22, and 23 are designed so that their tips rotate around pins 24, 25, and 26 so that they move away from or approach the machine frame 18.

30 in Fig. 3 is a valve box, and the rotary valve 31
is housed with its shaft 32 protruding left and right, and is attached to the front part of the machine frame 18.

The machine frame 18 is attached to a pipe 33 projecting rearward from the vertical frame 14 so as to be able to rotate within a certain width around a longitudinal axis. 34,3
5 and 36 are signal rods, which are rotatably provided on the shaft 32 and have arms 37, 38, 39 and floats 21, 2.
Consisting of rods 40, 41, 42 attached to 2, 23, each end of which is rotatably connected,
When the tips of the floats 21, 22, 23 move up and down, the rods 40, 41, 42 move up and down, causing the arms 37, 38, 39 to rotate around the shaft 32.

Reference numerals 43, 44, and 45 indicate levers that are fixed to the shaft 32 and whose tips are located above the arms 37, 38, and 39, and when the arms 37, 38, and 39 are raised, they are pushed by the levers and rotate the shaft 32. It's made like this. That is, when the tip of one of the floats 21, 22, 23 rises and the arm 37, 38 or 39 rises,
A lever 43, 44 or 45 is configured to rotate the shaft 32 in the direction of arrow A. Further, on this shaft 32, an arm 47 extending later and a spring 46 provided on this and the machine frame 18 are attached, and the levers 43, 4
4, 45 are pushed down.

In addition, the arms 37, 38, 39 and the lever 43,
Regarding the spacing between 44 and 45, in an equilibrium state, as shown in FIG.
and is configured in an open state.

Next, the hydraulic circuit diagrams controlled by this rotary valve 31 are shown in Fig. 5, and Figs. 6 and 7.
It is constructed to operate as shown in FIGS.

In an equilibrium state in which the work equipment section 17 maintains an appropriate height above the mud surface and the floats 21, 22, and 23 slide on the mud surface, the rotary valve 31
It is in the state shown in the figure. That is, the oil sucked up from the tank 49 by the pump 48 is transferred to the rotary valve 3.
It returns to the tank 49 through the central oil passage of 1. The cylinder 16a is a single-acting type, and the oil sent therein is blocked by the wall surface of the valve box 30 and is closed within the cylinder 16a, so that the working machine part 17 does not move up and down. When the working machine section 17 is lowered too far, the rotary valve 31 is switched as shown in FIG. 7, and the oil discharged from the pump 48 is
The oil is fed into the cylinder 16a from the right oil passage, and the piston rod 16b is pushed out and the links 12,1
3 to push up the working machine section 17.

On the other hand, if the work equipment section 17 rises too high, the rotary valve 31 switches as shown in FIG. 8, and the pump 4
The oil discharged from the cylinder 16a is returned to the tank 49 through the left oil path of the rotary valve 31, and the oil in the cylinder 16a is dropped into the tank 49 through the right oil path, and the piston rod 16b is lowered and the links 12, 13 The rear end of is lowered, and the working machine section 17 is lowered.

In addition, the code 50 in the figure is a relief valve, 5
1 is an operating rod for manually moving the valve, and 52 is a wire.

The rice transplanter configured in this way moves forward by rolling the front wheels 2, 2 and the rear wheels 3, 3 on the tiller A, and as the rice transplanter moves forward, the lower surfaces of the floats 21, 22, 23 become flat on the mud surface. Slide on B. And float 21,2
When the distance between 2 and 23 and the working machine part 17, that is, the working machine part 17 is maintained at a predetermined height with respect to the mud surface B, the rotary valve 31 is in the state shown in FIG. The portion 17 is in a stationary state with respect to the traveling vehicle body 1.

Here, when the traveling vehicle body 1 comes to a deep part of the tiller A, the distance between the tiller A and the mud surface B becomes wider, so that the work implement section 17 is easily pushed by the mud surface B. That is, the working machine part 17 comes too close to the mud surface B, and the seedlings are planted too deep. Then, float 21,2
2 and 23 rotate around pins 24, 25, and 26, and their tips rise and approach the working machine section 17. At this time, the rods 40, 41, 42 are connected to the respective arms 37,
38, 39 are pushed up, and the shaft 32 is moved to the levers 43, 4.
Rotate in the direction of arrow A with 4 and 45, and rotate the rotary valve 3.
1 is switched as shown in FIG. As a result, the oil discharged from the pump 48 is sent into the cylinder 16a from the right oil passage of the rotary valve 31, the piston rod 16b is pushed out, and the link 12,
13 rises, and the working machine section 17 rises to an appropriate height.

Conversely, when the traveling vehicle body 1 comes to the shallow part of the tiller A,
Since the distance between the tiller A and the mud surface becomes narrower, the working machine section 17 can easily float up from the mud surface B. In other words, the working machine section 17 is too far away from the mud surface, and the seedlings are planted too shallowly. Then, float 21,2
2 and 23 rotate around pins 24, 25, and 26, and the tips thereof descend and separate from the working machine section 17. At this time,
Rods 40, 41, and 42 are attached to each arm 3.
7, 38, 39, levers 43, 44,
The spring 46 rotates the shaft 32 in the opposite direction of the arrow A so that the spring 45 contacts the arms 37, 38, and 39, and the rotary valve 31 is switched to the state shown in FIG. the result,
The oil discharged from the pump 48 is returned to the tank 49 through the left oil path of the rotary valve 31, and the oil in the cylinder 16a is dropped into the tank 49 through the right oil path, the piston rod 16b is lowered, and the link 12,
13 is lowered, and the working machine section 17 is lowered to an appropriate position.

During such work, the arm 37 of the center float 21 contacts the lever 43, and the arms 38, 39 of the left and right floats 22, 23 are slightly apart from the levers 44, 45, so the center float 21 i.e. 3 floats 2
The working machine section 17 moves up and down with an average movement of 1, 22, and 23.

Furthermore, when the rice transplanter reaches the edge of the field, the planting clutch is operated to stop the operation of the seedling planting rods 20, 20, . . . and the working machine section 17 is rotated in a U-turn without being raised. Then, the working machine section 17 generates centrifugal force during the rotation, and tilts left and right about the front and rear axis inside the pipe 33. Therefore, the float 22 on the side that is tilted and lowered is pushed into the mud surface, and the machine frame 18 approaches, so the arm 38 on that side pushes up the lever 44, and the rotary valve 31 is moved by the shaft 32 in the direction of the arrow. The state shown in FIG. 7 is reached, and the oil discharged from the pump 48 flows from the right oil passage of the rotary valve 31 to the cylinder 16a.
The piston rod 16b is pushed out, the links 12 and 13 are pushed up, and the working machine section 17 is pushed up. As a result, the float 22 is also raised to a state of ground pressure that is slightly higher than standard,
Turn while sliding on the mud surface.

That is, during work, the center float 21 acts preferentially to move the working machine section 17 up and down.
There is no need to raise or lower the seedlings more than necessary, resulting in shallow planting or floating seedlings, and there is no hunting phenomenon in which the working machine section 17 is raised or lowered frequently. In addition, when turning, the work machine part 17 rises based on the float on the side that tilts left and right and descends, so the work machine part 17 can be raised efficiently without being pushed by the float without forcing the work machine part 17 up. Can turn well.

[Brief explanation of the drawing]

Fig. 1 is a side view of a riding rice transplanter according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view showing the connection between the float and the valve, and Fig. 4 is a partial view thereof. Front view, Figure 5 is its hydraulic circuit diagram, Figure 6
7 and 8 are explanatory diagrams showing the operating state of the rotary valve. The symbols in the figure are as follows. DESCRIPTION OF SYMBOLS 1... Traveling vehicle body, 9... Lifting mechanism, 17... Working machine part, 21... Float, 22... Float,
23...Float, 31...Rotary valve, 3
7...Arm, 38...Arm, 39...Arm, 43...Lever, 44...Lever, 45...
Lever, A...Plowing plate, B...Mud surface.

Claims (1)

[Claims] 1. A work machine section 17 that moves up and down with respect to the mud surface using the lifting mechanism 9, and floats 21, 22 that are provided below the work machine section 17 and slide on the mud surface as the work machine section 17 moves forward. 23, this float has a center float 21 and left and right floats 22, 23.
. . . are arranged in odd numbers horizontally, each of which is provided to move up and down independently with respect to the working machine section 17, and includes an elevating mechanism 9 and floats 21, 22, 2.
3... means multiple floats 21, 22, 23...
When one of the floats approaches the work machine section 17 side, the work machine section 17 rises from the mud surface, and when all the floats 21, 22, 23... move away from the work machine section 17, the work machine section 17 approaches the mud surface. connected like this,
The center float 21 is connected to the side floats 22 and 23.
An elevating device for a working machine part in an agricultural working machine for paddy fields, characterized in that it is connected to a lifting mechanism 9 so as to raise the working machine part 17 by approaching the working machine part 17 less than ......