JPH0465642B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention links the front part of a sensor float that swings up and down around a rear fulcrum with a lifting mechanism for driving a seedling planting device through an interlocking mechanism such as a wire mechanism. The seedling planting device is configured to be able to be controlled up and down so that the set interval between the front part of the sensor float and the seedling planting device is constant based on the sensor float operation related to ground pressure fluctuations, and the rear fulcrum and the sensor float are The present invention relates to a rice transplanter in which the front part is configured to be movable up and down in the same direction, and the planting depth can be adjusted.

[Conventional technology]

In this type of rice transplanter, to configure the seedling planting depth adjustment structure, conventionally, a bell crank that rotates together with the planting depth adjustment lever is fixed to the planting depth adjustment lever pivot shaft, and The rear end bracket of the sensor float is connected to one end of this bell crank so that it can swing freely, and this connection point becomes the rear fulcrum, and a bell crank that can swing around the horizontal axis is attached to the front end of the planting case. and one end of the bell crank is connected to the front end bracket via a bending link, and the inner wire of the wire linked to the seedling planting device drive lifting mechanism is connected to the front end bracket, and the outer wire is connected to one end of the bell crank. The two bell cranks are connected by a connecting rod, and then both bell cranks are swung up and down by adjusting the planting depth adjustment lever, so that the two bell cranks are moved in the same direction as the rear fulcrum of the sensor float. (Japanese Patent Laid-Open No. 55-92608)
Publication No.).

[Problem that the invention seeks to solve]

However, in this case, a connecting rod that connects both bell cranks is required, which requires a large number of parts, and a space must be secured for the connecting rod to adjust the planting depth. The structure has become larger as it spans the front and rear ends of the
In addition, it was necessary to adopt a complicated configuration in which both bell cranks were installed and connected by a connecting rod.

An object of the present invention is to provide a structure that can simplify the planting depth adjustment structure by effectively utilizing a planting depth adjustment lever.

[Means for solving problems]

The characteristic configuration according to the present invention is that the front end bracket of the sensor float is pivotally supported to be vertically swingable around a rear fulcrum relative to the seedling planting device, and the middle is pivoted to a fulcrum shaft extending from the seedling planting device. and one end of a seesaw-type rocking fitting, which is interlocked and connected via a link mechanism, and a biasing mechanism is provided between the one end and the link mechanism to bias the sensor float in the grounding direction,
The seedling planting device driving elevating mechanism and the front part of the sensor float are interlocked and connected via an interlocking mechanism, and based on the up and down swinging motion of the sensor float against the biasing mechanism applied to ground pressure fluctuations. The seedling planting device is controlled to move up and down to maintain the distance between the one end and the front end bracket within a set range, and furthermore, the engagement portion provided on the planting depth adjustment lever that can adjust the rear fulcrum up and down is controlled to swing the seedling planting device. By engaging with the other end of the metal fitting, the front part of the sensor float is moved up and down in the same direction as the rear fulcrum that moves up and down in conjunction with the lever operation, so that planting depth can be controlled. In other words, one end of the swinging metal fitting is linked to the front end bracket, and the other end is engaged with the planting depth adjustment lever, and the effects are as follows.

[Effect]

In other words, the other end of the seesaw type rocking bracket is engaged with the planting depth adjustment lever to restrict the rocking of the rocking bracket during planting work, and the front part of the sensor float is rocked via the link mechanism. It is interlocked and connected to one end of the movable fitting, and the seedling planting device can be controlled up and down based on the rocking motion of the sensor float around the rear fulcrum.

Moreover, when you operate the planting depth adjustment lever,
One end of the swinging metal fitting connected to the front part of the sensor float can be swung up and down, and the front part of the sensor float can be moved up and down in the same direction as the rear fulcrum while keeping the interval constant; Planting depth can be adjusted.

〔Effect of the invention〕

By providing a swinging bracket and extending the planting depth adjustment lever to the vicinity of the swinging bracket, there is no need for a connecting rod to connect the front and rear bell cranks as in the past, and the installation space can be reduced. In addition, since the planting depth adjustment lever itself can be configured to double as a conventional connecting rod, the planting depth adjustment mechanism can also be simplified. Moreover, since the modification for this purpose only involves changing the extending direction of the proximal side of the planting depth adjustment lever, the design burden for modification can be kept to the necessary minimum.

〔Example〕

As shown in Figure 5, engine 1 is installed at the front of the aircraft.
The aircraft body equipped with the mission case 2 and the control section 3 is connected to the seedling platform 4, the seedling planting mechanism 5, the planting case 6,
A rice transplanter is constructed by linking a seedling planting device 8 consisting of a group of 7 ground floats via an elevating link mechanism 9 so as to be able to move it up and down.

Elevation control of the seedling planting device 8 will be described in detail. As shown in FIG. 1, a connecting arm 11 is protruded and fixed to a horizontal support shaft 10 that is rotatably supported around its own axis with respect to the planting case 6 so as to be integrally rotatable. and the rear end bracket 1 of the sensor float 7A located at the free end of the sensor float 7A and the center of the ground float 7 group.
2 are interlocked and connected so as to be relatively swingable, and the sensor float 7A is pivotally supported to operate the sensor so as to be able to swing up and down, using the connection axis X between the bracket 12 and the free end of the connection arm 11 as a rear fulcrum. be.
A balance-type swinging arm 14, which is an example of a link mechanism capable of vertically swinging, is pivotally supported on the front end bracket 13 of the sensor float 7A.
The inner wire 17a of the interlocking mechanism 17 is attached to the front end of the
are connected to each other, and this inner wire 17a drives the lifting link mechanism 9 for the seedling planting device 8.
It is operatively connected to a control valve 16 provided for a hydraulic cylinder 15, which is an example. On the other hand, as described later, the outer wire 17 is attached to the upper spring receiving member 24.
b is fixed. 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.
As shown in FIGS. 2 to 4, the structure of this compression spring 20 device will be described in detail. A member 23A, which is approximately U-shaped in plan view, is connected to a fulcrum shaft 21 extending forward from the fuselage frame. The center of the flange surface of the flange is loosely fitted around the fulcrum axis so that it can swing up and down, and the U-shaped member 23B, whose web surfaces are butted against each other, is fixed to this U-shaped member 23A, so that it can swing like a seesaw. A metal fitting 23 is configured. The U-shaped member 23B is provided with an insertion hole 23a on one flange surface, a pin 23b protruding forward on the other flange surface, and a U-shaped upper spring receiving member 24 with the web surface facing upward.
The insertion hole 23a and the pin 2 are formed on the two flange surfaces of the
3b, the insertion pin 24a and the engagement hole 24 respectively engage with the insertion pin 24a and the engagement hole 24.
b, through which the upper spring receiving member 24 is attached so as to be able to swing relative to the U-shaped member 23B. On the other hand, a connecting rod 25 is connected to the rear end of the scale-type swinging arm 14 so as to be relatively swingable.
is made to penetrate the upper spring receiving member 24 and protrude upward, and the lower spring receiving member 26 consisting of a spring receiving part 26A and a pipe 26B fixed to the spring receiving part 26A is fitted onto the connecting rod 25,
The upper spring receiving member 24 is penetrated therethrough. The compression spring 20 is fitted onto the connecting rod 25 between the upper and lower spring receiving members 24 and 26.
is installed. A pin insertion hole 2 is provided in a portion of the connecting rod 25 corresponding to the lower end of the pipe 26B.
5a is provided, and by inserting and fixing a stop pin (not shown) into this insertion hole 25a,
The relative sliding movement between the connecting rod 25 and the pipe 26B is restricted, and the biasing force of the compression spring 20 is set. Then, insert the insertion hole 25a into the connecting rod 25.
By providing a plurality of holes in the axial direction of the compression spring 20, the retaining pins can be replaced and the biasing force of the compression spring 20 can be varied. A hooking collar 26a is provided at the tip of the pipe 26B, and a push-up lever 33 that comes into contact with the collar 26a from below is pivotally supported on the upper spring receiving member 24 so as to be able to swing. When replacing the retaining pin, the push-up lever 33 is operated to slightly lift the lower spring receiving member 26 so that the retaining pin can be easily inserted and removed.

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 is switched to the valve spool 16a by the vertical movement of the front end of the sensor float 7A, which swings up and down due to ground pressure fluctuations against the biasing force of the compression spring 20. , an end of the outer wire 17b serving as a reference position of the seedling planting device, which extends to the lateral side of the U-shaped member 23B and is located on the circumference of the illustrated radius R centered on the connection axis X. The device is configured to control the raising and lowering of the seedling planting device 8 so that the reference distance L between the front end of the scale swinging arm 14 and the front end of the swinging arm 14 is constant.

As shown in FIGS. 1 to 4, 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 round bar-shaped projection 29, which is an example of an engaging part, is protruded from a holder 28 that holds this planting adjustment lever 27. At the same time, the other end 23 of the U-shaped member 23A
d is provided with a semicircular engagement recess 23c, and the projection 2
9 into the engagement recess 23c, and by swinging the planting adjustment lever 27, the swinging fitting 23 is swung around the axis of the fulcrum shaft 21, and the front end of the sensor float 7A is aligned with the reference point. It is designed to move up and down by the same amount as the rear end while keeping the distance L constant.

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 in the vertical direction 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. The mechanism is configured to do this.

[Another example]

B. The biasing mechanism 20 may be a tension spring that biases the rear end of the balance-type swinging arm 14 downward, or any mechanism other than a spring that can exert an elastic force may be used.

○B The interlocking mechanism 17 may be a string-like one.

(c) 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.

○D As the means for raising and lowering the seedling planting device, a wheel case with a propulsion wheel pivoted at the lower end is pivoted to the machine frame so as to be able to swing up and down around a mounting fulcrum, and this wheel case is allowed to swing up and down with respect to the machine body. Depending on the situation, a device used in a walking rice transplanter that controls the raising and lowering of the seedling planting device 8 may be used.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, FIG. 1 is a side view showing the connection between the sensor float and the control valve for the raising and lowering mechanism driving the seedling planting device, and FIG. 2 shows the planting depth adjustment lever and Figure 3 is a front view of Figure 2, Figure 4 is a perspective view showing the relationship between the planting depth adjustment lever and the rocking bracket, and Figure 5 is an overall side view. It is a diagram. 7A...sensor float, 8...seedling planting device,
13...Front end bracket, 14...Link mechanism,
15... Seedling planting device drive elevating mechanism, 17... Interlocking mechanism, 20... Biasing mechanism, 23... Rocking metal fitting, 2
3d...other end, 24...one end, 27...planting depth adjustment lever, 29...engaging portion, L...interval, X...
...rear fulcrum.

Claims (1)

[Claims] 1 The front end bracket 13 of the sensor float 7A is pivotally supported to the seedling planting device 8 so as to be able to swing up and down around the rear fulcrum X, and the middle is pivoted to the fulcrum shaft 21 extending from the seedling planting device 8. The one end 24 of the seesaw-type rocking fitting 23 is interlocked with the link mechanism 14, and the one end 24 and the link mechanism 1
A biasing mechanism 20 for biasing the sensor float 7A in the grounding direction is provided between the seedling planting device drive lifting mechanism 15 and the front part of the sensor float via an interlocking mechanism 17, Accordingly, the seedling planting device 8 is operated in order to maintain the distance L between the one end 24 and the front end bracket 13 within a set range based on the vertical swing motion of the sensor float 7A against the biasing mechanism 20 applied to ground pressure fluctuations. A planting depth adjustment lever 27 that controls the elevation and can further adjust the elevation of the rear fulcrum X.
The engaging portion 29 provided at the other end 2 of the swinging fitting 23
3d, and in conjunction with the operation of the lever 27, the front part of the sensor float is moved up and down in the same direction as the rear fulcrum X, which moves up and down, so that the planting depth can be controlled. Rice transplanter.