JPH0430706A - Rice transplanter - Google Patents

Abstract

PURPOSE:To prevent pitching of the subject rice transplanter accompanying supply of reserve seedlings by switching the lowering speed of a seedling planting unit to a lower speed, using a variable speed system when supplying the reserve seedlings. CONSTITUTION:When a signal for supply of reserve seedlings is sent from a sensor 16 for detection of the residual quantity of seedlings to a controller 31, a two-positional electromagnetic switching valve 28 is operated and switched so that oil discharge from a cylinder (C) may be carried out through an orifice 29. The lowering speed of a seedling planting unit 2 is changed to a lower speed thereby.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is configured to attach a seedling planting device to a traveling machine so that it can be raised and lowered freely, and to control the raising and lowering operation of the seedling planting device by a lifting drive mechanism. , a preliminary seedling accommodating device is disposed above the seedling platform constituting the seedling planting device, and the preliminary seedling accommodating device is connected to a seedling placement position where the preliminary seedlings are placed and held, and one end thereof is located above the seedling platform. The seedling feeding position is configured such that the position can be freely changed between a seedling feeding position and a seedling feeding position where the preliminary seedlings are slidably fed onto the seedling platform, and furthermore, a sensor is provided to detect when the number of seedlings on the seedling platform has decreased to a predetermined amount. The present invention relates to a rice transplanter provided with a preliminary seedling supply control mechanism that switches the preliminary seedling storage device to a seedling supply position based on the detection result of the sensor.

[Conventional technology]

In the above rice transplanting machine, when the spare seedling storage device is switched to the seedling supply position and the spare seedlings are slid onto the seedling platform and fed, the spare seedlings move downward, so the rice transplanting machine as a whole The center of gravity moves to the rear. Two spare seedlings per row start to be supplied and moved at the same time, and if three rows of spare seedlings start moving at once, the equivalent of 50 kg will rapidly move downward.

Also, especially when switching the preliminary seedling supply device from the seedling placement position to the seedling supply position, as shown in Fig. 1, when the preliminary seedling supply is in progress! (
When the locking member (15) supporting the tip of the seedling supply device (11) is removed and the preliminary seedling feeding device (11) is allowed to swing freely around the rear fulcrum (X), the preliminary seedling supply device (11) is fed with a weight of preliminary seedlings equivalent to 50 kg. The tip of the device falls onto the seedling surface.

Therefore, in any of the above cases, the rapid movement of the reserve seedlings may disrupt the weight balance of the entire rice transplanter, which may cause pitching of the rice transplanter. As a result, the planting depth of seedlings was sometimes inconsistent.

In particular, when controlling the raising and lowering of the seedling planting device based on the detection results of the ground sensor in order to maintain a constant seedling planting depth,
If the provision of preliminary seedlings and the lowering operation of the seedling planting device occur simultaneously, the weight balance of the rice transplanter will be greatly disturbed and the pitching phenomenon of the rice transplanter will become severe.

An object of the present invention is to provide a rice transplanter capable of suppressing the pitching phenomenon caused by supplying preliminary seedlings.

[Means to solve the problem]

A characteristic configuration according to the first invention is to provide a mechanism that varies the descending speed of the seedling planting device, and when the preliminary seedling supply control mechanism supplies preliminary seedlings, the variable mechanism lowers the descending speed of the seedling planting device. It is configured to switch, and its operation is as follows.

[For production]

In other words, by reducing the descending speed of the seedling planting device, which can aggravate and amplify the pitching phenomenon of the rice transplanter if it occurs at the same time as preliminary seedling supply, the center of gravity change due to the descent of the seedling planting device can be moderated. This makes it possible to reduce the pitching phenomenon of the rice transplanter due to the supply of preliminary seedlings.

[Means to solve the problem]

A characteristic configuration according to the second invention is that the lifting drive mechanism is configured to stop the lifting and lowering operation of the seedling planting device when the preliminary seedling supply control mechanism supplies preliminary seedlings, and its operation is as follows. be.

[For production]

The pitching phenomenon of the rice transplanter is reduced or eliminated in order to stop the raising and lowering operation of one of the seedling planting devices of the raising and lowering operation of the seedling planting device and the supply of preliminary seedlings, which induce the pitching phenomenon of the rice transplanter due to simultaneous operation. be able to.

[Means to solve the problem]

A characteristic configuration of the third invention resides in that the lifting drive mechanism is configured to raise the seedling planting device for a certain short period of time when the preliminary seedling supply control mechanism supplies preliminary seedlings, and its operation is as follows. It is as follows.

[For production]

In other words, by raising the seedling planting device, the center of gravity of the rice transplanter, which rapidly moves downward due to preliminary seedling supply, can be minimized or offset.

Therefore, the pitching phenomenon of the rice transplanter can be suppressed compared to the conventional method.

[Means to solve the problem]

The characteristic configuration of the fourth invention is that a seedling planting device is attached to the traveling machine body,
The seedling planting device is attached via a suspension mechanism, and is configured to control the lifting and lowering operation of the seedling planting device with respect to the traveling machine body by a lifting drive mechanism, and a preliminary seedling storage device is provided above the seedling platform constituting the seedling planting device. and a seedling supply position where one end approaches the seedling platform and slides and supplies the preliminary seedlings onto the seedling platform. The device is configured to be able to freely switch its posture, and further includes a sensor that detects when the number of seedlings on the seedling stand has decreased to a predetermined amount, and switches the preliminary seedling storage device to a seedling supply position based on the detection result of the sensor. The apparatus provided with a preliminary seedling supply control mechanism is provided with a mechanism for stopping the operation of the suspension mechanism when the preliminary seedling supply control mechanism supplies preliminary seedlings, and its operation is as follows.

[For production]

That is, when preliminary seedlings are supplied to the seedling platform, the seedling planting device vibrates via the suspension mechanism due to the weight movement. Then, the vibration of the seedling planting device and the movement of the center of gravity due to the supply of spare seedlings may combine to cause pitching of the rice transplanter.

Therefore, by locking the suspension mechanism and stopping its operation, it is possible to eliminate one of the causes of pitching of the rice transplanter that occurs at the same time, and as a result, the pitching phenomenon of the rice transplanter can be suppressed. .

〔Effect of the invention〕

By supplying spare seedlings, it is possible to suppress the pitching phenomenon of the rice transplanter, and it is possible to suppress poor planting of seedlings and poor riding sensation for the driver.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 shows a riding type rice transplanter according to the present invention. This rice transplanter has a seedling planting device (2) attached to the rear of a riding-type traveling body (34) via a lifting link mechanism (1) that can be driven up and down.
It is constructed by connecting.

As shown in FIG. 1, the seedling planting device (2) includes a seedling platform (3) tilted downward from the rear, and a planting mechanism (4) disposed below the rear of the seedling platform (3). The seedling platform (3) is attached to a planting transmission case (6) which also serves as a frame so as to be driven back and forth from side to side with a constant stroke. At the bottom of the seedling stand (3
) When the seedling is moved laterally, it locks onto the placed seedling to prevent it from slipping and maintains its position, and at the end of the stroke, the endless belt-type vertical feed mechanism with a protrusion (7) feeds the seedling downward by an amount corresponding to the amount of one plant planted. is provided.

The planting mechanism (4) has a rotating case (8) that rotates around a horizontal axis attached to the rear part of the planting transmission case (6), and a rotating case (8) that draws an elliptical locus at both ends of the case (8). A planting claw (9
), and a fertilizing device (10) is installed above the planting mechanism (4).

A preliminary seedling accommodating device (11) is provided above the seedling platform (3), and this preliminary seedling accommodating device (11) is located above and holds the seedlings in a position substantially parallel to the seedling platform (3). It is configured to be able to freely switch and swing between a seedling loading position where the seedlings are placed and held, and a seedling supplying position where the rear end is in contact with the seedling loading stand (3). In other words, the preliminary seedling storage device (11) is
In addition to being supported swingably around the surrounding area, a preliminary seedling storage device (
11) A locking mechanism that locks at the rear lower end to lock and hold the seedlings in the seedling placement state, and releases the locking state to allow the preliminary seedling storage device (11) to fall under its own weight to the seedling supplying state. A) is provided.

Specifically, as shown in FIGS. 1 and 2, a side wall (13) is provided over a long range in the vertical direction at the top of the partition (12) between each row of the seedling stand (3). At the same time, a pivoting support (17) of the preliminary seedling accommodating device (11) is installed and fixed upright, and a swinging pivot portion (17) of the preliminary seedling accommodating device (11) is located above the seedling stand (3) on this side wall (13).
and side walls (13) on both sides of the preliminary seedling storage device (11).
, the rocking pivot support (17) in (13).

(17), it is configured to stably swing support. On the other hand, a support frame (18) extending horizontally over the entire width is fixed to the upper part of the lower edge of the seedling stand (3) on the side wall (13), and each side wall ( 13), an electromagnetic solenoid (14) is mounted and fixed via a bracket (19). The bracket (19) includes a locking member that is swingable between a position where the free end side of the preliminary seedling storage device (II) is placed and locked, and a position where it is rocked and released from the engagement state. (15) is supported. The locking member (15) is maintained at the locking position by locking one end of the locking member (15) to the actuator (14a) of the electromagnetic solenoid (14) that protrudes sideways, and the locking member (15) is maintained at the locking position when the actuator (14a) is moved back and forth. By doing so, the weight of the preliminary seedling storage device (11) causes the device to move to the released position. The locking member (15) and the electromagnetic solenoid (14)
) constitutes the locking mechanism (A).

A seedling mounting table (3) is installed at a position in the horizontal direction of the seedling vertical feeding mechanism (7) in the seedling mounting table (3) and at a central position in the vertical feeding direction.
) Remaining seedling amount sensor (16) that can be freely switched between a non-detection state in which it protrudes upward from the seedling placement surface (3a) and a detection state in which it retracts below the seedling placement surface (3a) depending on the weight of the seedlings. are arranged. When the number of seedlings placed on the seedling platform (3) becomes low and the remaining seedling amount sensor (16) is not detected, the electromagnetic solenoid (14) is actuated, and the preliminary seedling storage device (11) is activated. It is linked so that it can be switched from the seedling placement position to the seedling supply position based on its own weight.

The preliminary seedling storage device (11) is formed by connecting a seedling placement plate (lla) with left and right side wall forming members (llb), (llb), and has a horizontal axis centered on the swinging pivot portion (17). (X)
The preliminary seedling storage device (11) is placed and supported on the supporting frame (21) which is attached to be able to swing freely around the area, and the seedling loading stand (3
) is held in place so that it can slide freely only in the direction along the

Then, the preliminary seedling storage device (11
A locking member (22) attached to the lower surface side of the upper end of the support frame (21) contacts the upper end of the support frame (21) to maintain the position, and the spare seedling storage device (11) can be extracted rearward and upward. It has been done.

Note that (23) in the figure is a seedling holding stay that prevents the seedlings from floating up. (20) is a manual lever for returning the preliminary seedling storage device (11) from the seedling supply position to the seedling placement position.

Next, the elevation control of the seedling planting device (2) will be explained.

Lifting link mechanism (1) that lifts and lowers the seedling planting device (2)
At the same time, a lifting cylinder (C) is installed, and a lifting control valve (26) is installed in the oil supply circuit to this lifting cylinder (C), and a center ground flow that swings up and down around the rear fulcrum (Y). (15C) is linked with wire (27),
The structure is configured such that the seedling planting device (2) is raised and lowered relative to the traveling body using the lifting cylinder (C), and the seedling planting depth can be maintained at the set depth regardless of the vertical movement of the traveling body with respect to the field surface. There is.

From the above, the relationship between the elevation control and the preliminary seedling supply control will be explained. As shown in FIG. 1, pressure oil from the hydraulic pump (33) reaches the lift control valve (26), and via the lift control valve (26), reaches the lift cylinder (C). The return oil from the lift cylinder (C) returns to the tank (T) via the lift control valve (26).

A two-position electromagnetic switching valve (28) is provided on the return path (a) from the lifting cylinder (C) to the tank (T), and one operating position (niorifice (29)) of the switching valve (28) is provided. .

Here, when the switching valve (28) is switched to the side where oil is drained through the orifice (29), the squeezing effect is high by the action of the first nozzle (29), and the descending speed of the seedling planting device (2) is reduced to a low speed. I'm coming.

Although the explanation was omitted earlier, there are two cases in which the elevation control valve (26) is driven by vertical swinging of the center grounded float (5);
Manual operation Leno <- (3Q) may force the drive,
Manual operation takes precedence. Seedling planting device (2)
is in the lowered state, that is, the manual operation lever (30
), or in the case of a lowering operation using lifting control.At the same time, if a preliminary seedling replenishment signal is input to the control device (31) from the remaining seedling amount sensor (16), the two-position electromagnetic switching Operate the valve (28) to open the lifting cylinder (C
) Drainage of the oil from the seedling planting device (2) through the orifice (29) is performed by switching the descending speed of the seedling planting device (2) to a low speed (by changing the pitching speed of the seedling planting device (2) by supplying preliminary seedlings). We are trying to suppress the phenomenon.

As shown in FIG.
The auxiliary step (35) can be used as a scaffold by extending the auxiliary step (35) when replenishing the auxiliary seedling storage device (11) with the auxiliary seedlings from outside the machine. can.

[Another example]

■ Did you show that the signal from the remaining seedling sensor is used as a means of determining when spare seedlings are automatically replenished?
In addition to this, (2) an activation signal of an electromagnetic solenoid (14) that switches the preliminary seedling storage device (11) to the seedling supply position may be captured. (2) A signal from a potentiometer that detects changes in the swinging posture of the preliminary seedling storage device (II) may be captured.

(2) The pressing force of the tip of the preliminary seedling accommodating device (11) impactingly abutting on the seedling placement (3a) may be captured. (2) If a manual switching lever is provided for artificially changing the posture of the reserve seedling storage device (11) and replenishing seedlings, the operation of the manual switching lever may be captured by a potentiometer and the signal from the potentiometer may be used. In the above, these are referred to as "starting of preliminary seedling supply control".In addition, the timing for switching the descending speed of the seedling planting device (2) to a low speed etc. may be "during preliminary seedling supply". It may be a little earlier or earlier than "starting preliminary seedling supply control".

■ The lift cylinder (C) and the lift control valve (26)
The hydraulic system including the above may be collectively referred to as the lifting drive mechanism, and may also include control equipment for constant plowing depth control using the center ground float (5).

(2) The mechanism for varying the descending speed of the seedling planting device (2) may be a choke type throttle other than an orifice, a variable throttle mechanism, or PWM control of a solenoid valve.

(2) When the preliminary seedling supply control starts, the lowering of the seedling planting device (2) may be stopped. In other words, as shown in Fig. 5, the elevation control valve (26) is of a solenoid type, and a manual operation lever is used to operate the forced elevation of the seedling planting device (2).
- A sensor (24) such as a potentiometer that detects the operating state of (30) or the vertical movement of the center grounded float (5) is provided, and the lift control valve is operated based on the signal from the sensor. (26) to the neutral operating position to stop the raising and lowering of the seedling planting device (2).

(2) Alternatively, when the preliminary seedling supply control is started, the lift control valve (26) may be switched to the raising operation position so as to actively raise the seedling planting device (2).

■ As shown in Fig. 6, a coil spring type suspension mechanism (37) is installed between the lifting cylinder (C) and the lifting link mechanism (1), so that the influence of fine irregularities on the field surface can be removed from the lifting cylinder (C). Are you using a configuration that does not convey information to
A cylinder-type hydraulic locking device (38) is arranged between the piston rod of the cylinder (C) and the elevating link mechanism (1), and the suspension mechanism (37) is locked when the preliminary seedling supply control is started. It's okay.

Alternatively, a wedge-shaped locking device may be inserted between each winding of the coil spring to stop the expansion and contraction of the coil spring. The above is referred to as a mechanism for stopping the operation of the suspension mechanism (37).

It should be noted that the present invention is not limited to the structure shown in the accompanying drawings by adding reference numerals in the claims for convenient comparison with the drawings.

[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 a seedling planting device and a spare seedling storage device, FIG. 2 is a side view showing a preliminary seedling supply state, and FIG. Overall side view, 4th
The figure is a plan view showing the installation state of the auxiliary step, Figure 5 is a circuit configuration diagram that changes the elevation control valve to a solenoid valve and electrically switches the elevation state, and Figure 6 is the main part showing the suspension locking mechanism. It is an enlarged side view. (2) Seedling planting device, (3) Seedling stand, (11) Spare seedling storage device, (16)
...Sensor, (34) ...Traveling aircraft,
(35)... Suspension mechanism, (36)...
・・・・・・Operation stop mechanism.

Claims (1)

[Claims] 1. The seedling planting device (2) is attached to the traveling body (34) so that it can be raised and lowered, and the raising and lowering operation of the seedling planting device (2) is controlled by a lifting drive mechanism. A preliminary seedling accommodating device (11) is arranged above the seedling platform (3) constituting the seedling planting device (2), and this preliminary seedling accommodating device (11) is used to place and hold the preliminary seedlings. The seedling loading position is configured to be freely switchable between a seedling loading position and a seedling supplying position where one end approaches the top of the seedling loading stand (3) and the preliminary seedlings are slidably fed onto the seedling loading stand (3); A sensor (16) is provided to detect that the number of seedlings on the stand (3) has decreased to a predetermined amount, and the sensor (
Based on the detection result of (16), the preliminary seedling storage device (11)
) is provided with a preliminary seedling supply control mechanism for switching the seedling supplying device (2) to a seedling supply position, the rice transplanter is provided with a mechanism for varying the descending speed of the seedling planting device (2), and the rice transplanter is provided with a mechanism for varying the descending speed of the seedling planting device (2), and the preliminary seedling supply control mechanism At this time, the variable mechanism operates the seedling planting device (
2) A rice transplanter configured to switch the descending speed to a low speed. 2. The seedling planting device (2) is attached to the traveling body (34) so that it can be raised and lowered, and the raising and lowering operation of the seedling planting device (2) is controlled by a lifting drive mechanism. A preliminary seedling accommodating device (11) is arranged above the seedling platform (3) constituting (2), and this preliminary seedling accommodating device (11) is connected to a seedling placing position where the preliminary seedlings are placed and held, and one end of the preliminary seedling accommodating device (11) is configured to be able to freely switch its posture between a seedling feeding position where the seedling tray approaches the seedling tray (3) and slides and supplies preliminary seedlings onto the seedling tray (3); A sensor (16) is provided for detecting that the number of seedlings has decreased to a predetermined amount, and the sensor (16) is provided.
Based on the detection result of (16), the preliminary seedling storage device (11)
) to a seedling supply position, the rice transplanter is equipped with a preliminary seedling supply control mechanism that switches the seedling supply control mechanism to a seedling supply position, and when the preliminary seedling supply control mechanism supplies preliminary seedlings, the raising and lowering operation of the seedling planting device (2) is stopped. A rice transplanter with a drive mechanism. 3. The seedling planting device (2) is attached to the traveling body (34) so that it can be raised and lowered, and the raising and lowering operation of the seedling planting device (2) is controlled by a lifting drive mechanism. A preliminary seedling accommodating device (11) is arranged above the seedling platform (3) constituting (2), and this preliminary seedling accommodating device (11) is connected to a seedling placing position where the preliminary seedlings are placed and held, and one end of the preliminary seedling accommodating device (11) is configured to be able to freely switch its posture between a seedling feeding position where the seedling tray approaches the seedling tray (3) and slides and supplies preliminary seedlings onto the seedling tray (3); A sensor (16) is provided for detecting that the number of seedlings has decreased to a predetermined amount, and the sensor (16) is provided.
Based on the detection result of (16), the preliminary seedling storage device (11)
) to a seedling supply position, the rice transplanter is equipped with a preliminary seedling supply control mechanism that switches the seedling supply control mechanism (2) to a seedling supply position, and the seedling planting device (2) is raised for a certain period of time when the preliminary seedling supply control mechanism supplies preliminary seedlings. A rice transplanter comprising the above-mentioned lifting and lowering drive mechanism. 4. Attach the seedling planting device (2) to the traveling body (34) via the suspension mechanism (35),
It is configured to control the lifting and lowering operation of the seedling planting device (2) with respect to the traveling body (34) by a lifting drive mechanism, and a spare seedling platform (3) constituting the seedling planting device (2) is provided. A seedling accommodating device (11) is provided, and the auxiliary seedling accommodating device (11) is placed at a seedling placement position where the auxiliary seedlings are placed and held, and one end of which approaches the top of the seedling platform (3) to place the auxiliary seedlings. The seedling tray (3) is configured to be able to switch its posture freely between the seedling feeding position and the position where the seedlings are slid and fed onto the seedling tray (3), and further includes a sensor (16) that detects when the number of seedlings on the seedling tray (3) has decreased to a predetermined amount. In addition to providing the sensor (
Based on the detection result of (16), the preliminary seedling storage device (11)
) to a seedling supply position, the rice transplanter is equipped with a preliminary seedling supply control mechanism that switches the suspension mechanism (35) to a seedling supply position, the rice transplanter comprising a mechanism (36) that stops the operation of the suspension mechanism (35) when the preliminary seedling supply control mechanism supplies preliminary seedlings. A rice transplanter has been set up.