JPH0241284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transplanting depth control device for a self-propelled transplanter for transplanting tobacco seedlings and the like.

BACKGROUND ART Conventionally, a four-wheeled self-propelled transplanter has been used for transplanting tobacco seedlings and the like. When such a transplanter is run with the height of the machine fixed, the transplanting depth of the seedlings changes as the height of the transplanting ridge changes.
Cannot be transplanted to a certain depth. Therefore,
There is a transplanting machine in which the transplanting depth can be adjusted by moving the entire machine body up and down.

Problems to be Solved by the Invention Vertical adjustment of the machine body is very time-consuming because the work is done in response to changes in the height of the transplanted ridges. During the work, workers often overlook changes in the height of the transplanting ridge because it takes time and effort to supply seedlings, and if the height changes in the same transplanting ridge, the depth of the transplant may change. Variations are likely to occur. Furthermore, when adjusting the machine body up and down during work, it is common to stop the machine movement each time, which reduces work efficiency.

The present invention has been made in view of these points, and an object of the present invention is to obtain a transplanting depth control device for a self-propelled transplanter that can perform transplanting work while always keeping the transplanting depth constant.

Means for Solving the Problem A pair of left and right drive wheels 9 are provided so as to be movable in the vertical direction and fixed at any position, and a pair of left and right driven wheels 12 are provided so as to be movable in the vertical direction and at any position in conjunction with the vertical movement of the drive wheels 9. A detection unit 39 is provided so as to be freely fixed in position and detects the distance between the vehicle body 1 and the transplanting surface on which the seedlings are transplanted.
and an interlocking mechanism 40 that moves the drive wheels 9 up and down based on the detection result from the detection unit 39.

Operation During work, the detection unit 39 detects the distance between the vehicle body 1 and the transplanting surface on which the seedlings are to be transplanted, and based on the detection result, the driving wheels 9 and the driven wheels 1 are adjusted via the interlocking mechanism 40.
2 is moved up and down to keep the distance between the car body 1 and the transplant surface constant.

Embodiment An embodiment of the present invention will be described based on the drawings.
An engine 2 is mounted on the front part of a vehicle body 1 of the self-propelled transplanter, and a transmission case 3 is fixed to a chassis 4 approximately in the center of the vehicle body 1. An axle 5 extending in the left-right direction is provided at the lower end of the transmission case 3, and a pair of left and right transmission cases 6, 7 are provided at both ends of the axle 5 and are rotatable around the axis of the axle 5 and the engine. 1 so that driving force can be transmitted thereto. A rotating shaft 8 connected to the axle 5 via a chain (not shown) is provided at the lower end of the transmission cases 6, 7, and these rotating shafts 8 are connected to a pair of left and right rear wheels that are drive wheels. 9 are connected.
A front wheel shaft 10 extending forward is rotatably connected to the transmission cases 6 and 7 by a pin 11, and a pair of left and right front wheels 12, which are driven wheels, are connected to the tip of the front wheel shaft 10. A left-right width adjustment tube 13 having a left-right axis is fixed to the front part of the chassis 4, and a front wheel auxiliary rod 1 is attached to this left-right width adjustment tube 13.
One end of the front wheel auxiliary rod 14 is connected to the left and right width adjusting tube 13 so as to be rotatable around the axis thereof and the position thereof can be freely adjusted along the axial direction, and the other end of the front wheel auxiliary rod 14 is connected to a pin 15 approximately at the center of the front wheel shaft 10. are rotatably connected. The chassis 4, the transmission cases 6, 7, the front wheel auxiliary rod 14, and the front wheel shaft 10 constitute a substantially parallelogram link mechanism 16.

Next, an adjustment tube 17 having a horizontal axis is attached to the chassis 4 so as to be rotatable about the axis. A pair of left and right adjustment levers 18 are connected to both left and right ends of the adjustment tube 17 so as to be able to freely adjust their positions along the axial direction, and a bar 19 is fixed to a central portion of the adjustment tube 17. One end of a hydraulic cylinder 20 is rotatably connected to the tip of the lever 19 by a pin 21.
The other end of 0 is a mounting shaft 2 fixed to the chassis 4.
It is connected to 2. One end of a connecting rod 23 is rotatably connected to the tip of the adjustment lever 18 by a pin 24, and the other end of the connecting rod 23 is rotatably connected to the transmission cases 6, 7 by a pin 25. .

A hydraulic pump 26 is fixed to the chassis 4, and a hydraulic pipe 27 from the hydraulic pump 26 is connected to the hydraulic cylinder 20 via a valve 28. Note that the hydraulic pump 26 and the engine 2 are connected via a V-belt 29. One end of an auxiliary wheel support rod 30 is connected to the left-right width adjustment tube 13 so as to be rotatable about its axis, and an auxiliary wheel 31 is connected to the other end of the auxiliary wheel support rod 30 extending rearward. 32, the auxiliary wheel support rod 30 is rotatably connected to the auxiliary wheel support rod 30 so that it can be rotated about the axis thereof and fixed in any direction. A substantially L-shaped operating lever 33 is attached to the adjustment tube 17 and is rotatable about the axis of the adjustment tube 17, located between the adjustment lever 18 and the lever 19. An adjustment rod 34 is rotatably connected by a pin 35 between one end of the operating lever 33 that protrudes forward in a substantially horizontal direction and a substantially central portion of the auxiliary wheel support rod 30, and is rotated downward in a substantially vertical direction. An adjustment rod 37 is rotatably connected by a pin 38 between the other end of the protruding operating lever 33 and a valve lever 36 for operating the valve 28. and,
The auxiliary wheel 31, the auxiliary wheel support rod 30, the adjustment rod 34, the operating lever 33, the adjustment rod 37, the valve lever 36, etc. constitute a detection section 39 that detects the distance between the vehicle body 1 and the transplanting surface on which the seedlings are to be transplanted. ing. Further, the hydraulic pump 26, the valve 28,
Hydraulic piping 27, hydraulic cylinder 20, lever 19,
The adjustment tube 17, the adjustment lever 18, the connecting rod 23, etc. constitute an interlocking mechanism 40 that moves the rear wheel 9 up and down based on the detection result from the detection section 39.

A seedling stand 41 is fixed to the upper and both sides of the mission case 3, and a rotary pot 42 is provided at the rear of the chassis 4. and,
A transplant opening device 43 is provided below the rotary pot 42 and is moved up and down by the driving force from the engine 2 to transplant seedlings. Note that this transplant retractor 43 is arranged close to the auxiliary wheel 31. Further, a handle 44 is provided at the rear of the vehicle body 1 to which a clutch lever, a brake lever, an accelerator lever (not shown), etc. are attached.

In such a configuration, the second
As shown in the figure, the auxiliary wheels 31 are brought into contact with the transplanted surface of the ridge and are caused to roll as the vehicle body 1 moves forward.
Note that when the valve lever 36 is in the horizontal state as shown in FIGS. 1 and 3, the hydraulic cylinder 2
0 is a state in which no expansion/contraction operation is performed. That is, the oil supplied to the valve 28 from the first hydraulic piping 27a is recycled to the hydraulic pump 26 from the second hydraulic piping 27b, and the oil is supplied to the hydraulic cylinder 20 and the hydraulic cylinder through the third hydraulic piping 27c. The flow of oil from 20 has been stopped.

Here, a case where a convex portion is formed on the transplantation surface will be explained based on FIG. 4. When the auxiliary wheel 31 rides on the convex portion as the vehicle body 1 moves forward, the auxiliary wheel 31 rotates upward (in the direction of arrow a) about the axis of the left-right width adjustment tube 13 together with the auxiliary wheel support rod 30. Along with this rotational movement, the adjustment rod 34 moves upward (arrow b
direction), and the operating lever 33 rotates clockwise (in the direction of arrow c) around the axis of the adjustment tube 17.
Further, the adjustment rod 37 slides forward (in the direction of arrow d), and the valve lever 36 rotates downward (in the direction of arrow e). This rotation of the valve lever 36 switches the valve 28, and the hydraulic cylinder 20
Oil is supplied to the hydraulic cylinder 20 and extends in the direction of the arrow f. Due to the operation of this hydraulic cylinder 20, the lever 19, the adjustment tube 17, and the adjustment lever 18 rotate clockwise (in the direction of arrow g) as one unit, and the connecting rod 23
The transmission cases 6 and 7 are rotated clockwise (in the direction of arrow h) around the axis of the axle 5, and the rear wheel 9 is moved downward. In addition, as the transmission cases 6 and 7 rotate, the front wheel auxiliary rod 14 and the like that constitute the substantially parallelogram link mechanism 16 also rotate clockwise, and the front wheel 12 moves downward in the same manner as the rear wheel 9. .

As the rear wheels 9 and front wheels 12 move downward in this manner, the vehicle body 1 becomes relatively elevated, and the distance between the convex portion of the transplantation surface and the vehicle body 1, which was once small, becomes larger. As this distance increases, the auxiliary wheel 31 and the auxiliary wheel support rod 30 rotate downward (in the direction of arrow a'), and the adjustment rod 34,
The valve lever 36 is rotated upward (in the direction of arrow e') via the operating lever 33 and the adjustment rod 37. Then, when the distance between the vehicle body 1 and the transplant surface matches the distance between the vehicle body 1 and the transplant surface in a state where there is no convex portion, the valve lever 36 returns to the horizontal state, and the oil supply to the hydraulic cylinder 20 is stopped. At the same time, the rotation of the conduction cases 6 and 7 is stopped, and the transplanting depth of the seedlings is kept constant.

Next, the state when there is a recess on the transplantation surface or after the convex portion described in FIG. 4 has passed will be described based on FIG. 5. The auxiliary wheel 31 and the auxiliary wheel support rod 30 rotate integrally in the direction of arrow a',
Adjusting rod 34 moves in the direction of arrow b', operating lever 33 rotates in the direction of arrow c', adjusting rod 37 slides in the direction of arrow d', and valve lever 36 rotates in the direction of arrow e'. As a result, the oil in the hydraulic cylinder 20 is discharged to the hydraulic pump 26, and the hydraulic cylinder contracts in the direction of arrow f'. And lever 1
9. The adjustment tube 17 and the adjustment lever 18 are integrally aligned with the arrow
The transmission cases 6 and 7 rotate in the direction of arrow h' via the connecting rod 23, and the rear wheel 9 moves upward. Note that the front wheel 12 also moves upward in the same way as the rear wheel 9 by the substantially parallelogram link mechanism 16.

As the rear wheels 9 and front wheels 12 move upward in this manner, the vehicle body 1 is relatively lowered, and the distance between the concave portion of the implantation surface and the vehicle body 1, which once increases, becomes smaller. As this distance becomes smaller, the auxiliary wheel 31 and the auxiliary wheel support rod 30 rotate in the direction of the arrow a, and the adjustment rod 34, the operating lever 33,
The valve lever 36 is rotated via the adjustment rod 37 in the direction of arrow e. When the valve lever 36 returns to the horizontal state, the discharge of oil from the hydraulic cylinder 20 is stopped, the rotation of the transmission cases 6 and 7 is stopped, and the distance between the vehicle body 1 and the transplanting surface is adjusted so that there is no recess. The distance between the vehicle body 1 and the transplanting surface corresponds to that in the case where the seedlings are transplanted, and the transplanting depth of the seedlings is kept constant.

In this embodiment, the detection section 39 using the auxiliary wheel 31 is employed, but instead of the auxiliary wheel 31, a sled-like member that slides on the transplant surface may be used.

Further, an electric reversible motor may be used instead of the hydraulic cylinder 20, a changeover switch may be used instead of the valve 28, and a battery may be loaded.

In addition, in this embodiment, the left and right width adjustment tube 13 is the rotation center of the auxiliary wheel support rod 30, and the adjustment tube 17 is the rotation axis of the operating lever 33.
A support shaft may be separately provided in a part of the support shaft.

Effects of the Invention As described above, the present invention detects a change in the distance between the vehicle body and the implantation surface by the detection unit, and moves the driving wheels and the driven wheels up and down by the interlocking mechanism based on the detection result. Even if the transplanting surface is uneven, it is possible to maintain a constant distance between the vehicle body and the transplanting surface, maintain a constant transplanting depth of the seedlings, and improve the accuracy of the transplanting work. By automatically performing control, it is possible to reduce the labor of the operator, and the operator can concentrate on driving operations and supplying seedlings, thereby further improving work accuracy.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is an overall rear view, FIG. 3 is a side view showing main parts, and FIGS. 4 and 5 are an overall side view. It is an explanatory view showing a control state of the implantation depth. DESCRIPTION OF SYMBOLS 1... Vehicle body, 2... Engine, 9... Rear wheel (drive wheel), 12... Front wheel (driven wheel), 39... Detection part, 40... Interlocking mechanism.

Claims (1)

[Claims] 1. In a self-propelled transplanting machine for a four-wheeled vehicle body, a pair of left and right drive wheels rotated by the driving force from the engine are provided so as to be movable in the vertical direction and can be fixed at any position, and a pair of left and right driven wheels are attached to the drive wheels. A detecting section is provided to be movable in the vertical direction and fixed at any position in conjunction with the vertical movement, and to detect the distance between the vehicle body and the moving surface on which the seedlings are to be transplanted, and the driving section is provided based on the detection result from the detecting section. A transplant depth control device for a self-propelled transplant machine, characterized by having an interlocking mechanism that moves the wheels up and down.