JPH0522024Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is designed so that the sensing sensitivity of the sensor float can be varied in response to the hardness and softness of the field.
Specifically, a seedling planting device is connected to the rear of the traveling body via a swinging link mechanism that takes a backward-lowering position when it is on the ground, and the seedling planting device is pivotably supported to be able to move up and down with respect to the seedling planting device. , and operates the seedling planting device drive lifting mechanism based on the lifting and lowering operation caused by ground pressure fluctuations of the sensor float that is biased in the downward direction, so that the vertical height of the sensor float relative to the seedling planting device is within the set range. The device is equipped with a means for controlling the elevation of the seedling planting device, and is equipped with a mud hardness detection piece that plunges into the mud and swings due to ground resistance as the aircraft travels. The present invention relates to a rice transplanter that is configured to automatically increase the downward biasing force applied to the sensor float as it swings as the float swings, thereby making the sensing sensitivity of the sensor float variable.

[Conventional technology]

In this type of rice transplanter, conventionally, as shown by the imaginary line in FIG. 1, in order to provide the mud hardness detection piece 30, the base end is attached to the front end bracket 13 provided on the upper surface of the front end of the sensor float 7A. In addition to being pivotally supported, the working part that penetrates into the field is located at the rear and lower part of the machine toward its tip.

[Problem that the invention attempts to solve]

However, in this case, when the aircraft moves backward with the float in contact with the ground, the mud hardness detection piece is rotated in the opposite direction to when the aircraft moves forward. Moreover, the rotation angle is larger than when the machine is moving forward and swings upward on the field surface, so for example, as shown in FIG. Members 24, 26
Since one side is connected to the swinging mud hardness detection piece and the other is fixed, the lower spring receiving member 26 leans not only in the vertical direction but also in the lateral direction as the mud hardness detection piece swings. As a result, if the amount of rocking increases, the side slip will become too large, and both will exceed the sliding limit and become misaligned, which cannot be dealt with by accommodating within a small range when the aircraft moves forward, and in any case There is a problem if it gets damaged. Therefore, due to the connection between the biasing mechanism and the linkage mechanism to the drive elevation control mechanism, a rocking limit is set for the mud hardness detection piece, and the rocking limit cannot be exceeded when the aircraft is moving backwards. Because of the vibration, there was a risk that the mud hardness detection piece itself would be damaged. Furthermore, when the seedling planting device is raised from a state where it is on the ground, the seedling planting device rises while drawing an arc-shaped trajectory via the swing link mechanism, but when it is on the ground, the swing link mechanism does not move. Since the seedling planting device is in a backward-downward posture, the seedling planting device draws an arcuate trajectory backward while rising, and at this time, the detection piece, which has plunged into the mud, There was also the risk that the detection piece would be damaged by getting caught in straw, etc., and being tangled with mud.

The purpose of the present invention is to provide a device that can solve the problems of the conventional mud hardness detection piece by simply modifying it.

[Means for solving problems]

The characteristic configuration of the present invention is that the mud hardness detection piece is pivotally supported above the sensor float, and in its operating state, the middle of the action part located in the field is located at the lowest position, and the part behind the action part is The end is folded back to the vicinity of the lower surface of the sensor float when it is plunged into the mud, and its effects are as follows.

[Effect]

Since the rear end of the mud hardness detection piece is formed to stand up, the lower surface of the rear end becomes a rearwardly rising slope. Even if it moves, the resistance of the mud exerts an upward force on the detection piece itself, which prevents it from being damaged by forceful swinging when pushed into the mud. . In addition, even if the mud hardness detection piece is lifted diagonally backward and upward as the seedling planting device is raised, the rear end is raised close to the mud surface, so straw debris in the mud can be easily detected. There is less risk of the item being caught and lifted.

[Effect of idea]

Therefore, by making rational structural improvements, it is possible to prevent damage to the mud hardness detection piece even when the aircraft is moved backwards in the mud plunging posture or when the seedling planting device is raised. It has become something that can be done.

〔Example〕

As shown in Figure 5, engine 1 is installed at the front of the aircraft.
A seedling planting device 8 consisting of a seedling platform 4, a seedling planting mechanism 5, a planting case 6, and a group of 7 grounding floats is attached to the rear of a riding type traveling aircraft equipped with a transmission 2 and a control unit 3 using a link mechanism that lifts and lowers the seedlings. A riding type rice transplanter is constituted by interlocking and connecting them via 9 so that they can be driven up and down.
The elevating link mechanism 9 is configured to be operated in a swinging manner, and is configured to be in a backward downward position when the seedling planting device 8 is in contact with the ground.

Elevation control of the seedling planting device 8 will be described in detail. As shown in Figures 1 to 3, a horizontal support shaft 1 is rotatably supported around its own axis with respect to the planting case 6.
A connecting arm 11 is fixedly and integrally rotatably protruding from the ground float 7A, and the free end of the connecting arm 11 and the rear end bracket 12 of the sensor float 7A located at the center of the group of ground floats 7 are interlocked so as to be relatively swingable. At the same time, the bracket 12 and the connecting arm 1
The sensor float 7A is pivoted about the connection axis X with the first free end so as to be able to swing up and down to operate the sensor. The front end bracket 13 of the sensor float 7A has a scale-type swinging arm 14 that can swing up and down.
An inner wire 17a of a linking wire 17 is linked to the front end of the swing arm 14, and this inner wire 17a is a hydraulic cylinder which is an example of a lifting mechanism that drives the lifting link mechanism 9 for the seedling planting device 8. The control valve 16 provided for the control valve 15 is interlocked with the control valve 16 . More specifically, the inner wire 17a is operatively connected to a bracket 19 fixed to an operating shaft 18 that operates the spool 16a of the control valve 16 in forward and reverse directions. In addition, a sensor float 7 is attached to the rear end of the balance type swinging arm 14.
A compression spring 20, which is an example of a biasing mechanism that swings and biases A downward, is activated.
The detailed structure of this compression spring 20 device is as follows:
A substantially U-shaped member 28A in plan view is loosely fitted into the longitudinal axis 21 extending forward from the fuselage frame so as to be able to swing up and down about the longitudinal axis, and this U-shaped member 28A The swinging metal fitting 23 is constructed by fixing a U-shaped member 28B whose wave surfaces abut against each other. In the U-shaped member 23B, a U-shaped upper spring receiving member 24, whose wave surfaces are perpendicular to each other, is attached to the U-shaped upper spring receiving member 24 with the horizontal axis Y.
They are connected so that they can swing relative to each other.

On the other hand, a connecting rod 25 connected to the rear end of the scale-type swinging arm 14 so as to be relatively swingable is made to pass through the upper spring receiving member 24 and protrude upward, and the connecting rod 25 is attached to the spring receiving portion 26A.
A spring receiving member 26 consisting of a pipe 26B fixed to the spring receiving portion 26A is fitted externally and penetrated through the upper spring receiving member 24. The compression spring 20 is mounted between the upper and lower spring receiving members 24 and 26 so as to be fitted onto a connecting rod 25. The connecting rod 25 and the lower spring receiving member 26
The upper end of the pipe 26B is screw-fitted, and the lower spring receiving member 26 is rotated and screwed, and the upper and lower spring receiving members 2 are slidably moved relative to the connecting rod 25.
The biasing force of the compression spring 20 can be varied by adjusting the installation interval of the compression springs 4 and 26.

Therefore, the biasing force of the compression spring 20 serves as a biasing force that biases the sensor float 7A downward, and by adjusting the biasing force, the sensitivity of the sensor float 7A can be adjusted.
From the above configuration, the inner wire 17a switches the valve spool 16a by the vertical movement of the front end of the sensor float 7A, which swings vertically due to ground pressure fluctuations against the biasing force of the compression spring 20. , the end of the outer wire 17b, which extends on the side of the U-shaped member 23B and is located on the circumference of the illustrated radius R centered on the connection axis X, and the front end of the scale-type swinging arm 14. The device is configured to control the raising and lowering of the seedling planting device 8 so that the intervals are constant.

As shown in FIGS. 2 and 3, the planting depth adjustment mechanism will be described in detail. A planting adjustment lever 27 is fixed to a horizontal support shaft 10 that is pivotally supported on the planting case 6, and a projection 29 that engages with the U-shaped member 23B from a holder 28 that can swing together with the planting adjustment lever 27 is provided. is provided protrudingly, and by swinging the planting adjustment lever 27, the swinging metal fitting 23 is swung around the axis of the longitudinal axis 21, so that the front end of the sensor float 7A is moved up and down by the same amount as the rear end. It is set as.

As shown in FIG. 1, the sensor float 7A
A balance type swinging arm 14 and a mud hardness detection piece 3 are attached to a horizontal pivot shaft 22 which is pivoted to a front end bracket 13 of the
0 is attached so that it can rotate integrally through a slot. The mud hardness detection piece 30 plunges the action part 30B into the mud, and swings up and down against the biasing force of the compression spring 20 due to the ground resistance caused by the running of the machine, thereby detecting the hardness and softness of the field. It is structured as a mechanism. Moreover, this mud hardness detection piece 30 can swing integrally with the scale-type swinging arm 14, and the harder the field becomes, the more it swings upward to compress the compression spring 20 and lower the sensor float. The sensitivity of the sensor float is varied depending on the hardness and softness of the field so that the downward biasing force of 7 is increased, and when the field is soft, the biasing force is decreased. At that time, as shown by the imaginary line in Figure 1, the compression spring 2
0 is compressed when the mud hardness detection piece 30 swings upward, but since the distance between the outer wire end and the front end of the balance type swing arm 14 is kept constant, the balance type swing arm 14's swing center also moves upwards,
The sensor float 7A shifts to the forward upward position. Therefore, the sensor sensitivity is switched to become lower.

When the mud hardness detection piece 30 swings downward, the sensor float 7A shifts to the forward downward position.

As shown in FIG. 4, the mud hardness detection piece 30 is made of a pipe and has a cross-sectional shape that continuously changes from an oval to a flat plate from the base end 30A to the rear end. , an action part 30 that enters the field
The pressure receiving area of B is increased to ensure stability as a sensor. However, this does not have to be a pipe, and may be made of a flat plate and twisted to secure the pressure receiving area in the action portion 30B.

The mud hardness detection piece 30 has the middle of the action portion 30B located at the lowest position, and the rear end connected to the middle located at the lowest position is folded up to the vicinity of the lower surface of the sensor float.

[Another example]

B. The seedling planting device drive lifting mechanism 15 may be a pneumatic cylinder other than a hydraulic cylinder or a mechanical link mechanism using an electric motor.

[Brief explanation of drawings]

The drawings show an embodiment of the riding-type rice transplanter according to the present invention, and Fig. 1 is a vertical cross-sectional side view showing the relationship between the mud hardness detection piece and the sensor float, and Fig. 2 shows the rocking bracket and the planting depth. A plan view showing the connection with the adjustment lever, 3rd
The figure is a plan view of FIG. 2, FIG. 4 is a side view showing another embodiment of the mud hardness detection piece, and FIG. 5 is an overall side view. 7A...sensor float, 8...seedling planting device,
9... Swinging link mechanism, 15... Seedling planting device drive elevating mechanism, 30... Mud hardness detection piece, 30B... Action section.

Claims (1)

[Scope of utility model registration request] A seedling planting device 8 is connected to the rear of the traveling body via a swinging link mechanism 9 that is in a rearward downward posture when it is in contact with the ground, and is pivotably supported to be able to move up and down with respect to the seedling planting device 8. , and the seedling planting device drive lifting mechanism 15 is operated based on the lifting and lowering operation caused by the ground pressure fluctuation of the sensor float 7A biased in the downward direction, and the seedling planting device 8 of the sensor float 7A is operated.
It is equipped with a means for controlling the elevation of the seedling planting device to maintain its vertical height within a set range, and is also equipped with a mud hardness detection piece 30 that plunges into the mud and swings due to ground resistance as the aircraft travels. In the riding rice transplanter, the sensing sensitivity of the sensor float 7A is configured to be variable by automatically increasing the downward urging force on the sensor float 7A as the hardness detection piece 30 swings as the ground resistance increases, The mud hardness detection piece 30 is pivotally supported above the sensor float, and in its working state, the middle of the working parts 30B located in the field is located at the lowest position, and the working parts 30B
A riding-type rice transplanter whose rear end is folded back to a point located near the lower surface of the sensor float when it plunges into mud.