JPH06181609A - Grounding device for work vehicle Rolling operation structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Especially, in the ground operation device rolling operation structure of the work vehicle in which the actuator on the body side and the ground work device are connected by the first spring, and the ground work device is configured to be freely rollable. The delay of the rolling operation due to the extension of the first spring when the device is largely tilted is prevented. [Arrangement] The machine-side actuator 14 and the ground work device are connected via a first spring 12, and the actuator 14 and the ground work device are connected via a fusion 22 and a second spring 13 so that the actuator 14 When operating within a set range B including the center A of the operating range, this motion is transmitted to the ground work device via only the first spring 12,
Then, when the actuator 14 operates beyond the set range B, this operation is transmitted to the ground work device via the first spring 12 and the second spring 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports ground working devices (seedling planting devices, rotary tillers, etc.) such as riding type rice transplanters and agricultural tractors so that they can be freely rolled around the longitudinal axis of the machine. To the ground work device rolling operation structure of the above-mentioned work vehicle.

[0002]

2. Description of the Related Art A passenger type rice transplanter, which is an example of a work vehicle as described above, has a structure as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 1-72015.
In this structure, a seedling planting device (corresponding to a ground work device) (3 in FIG. 1 of the publication) is supported so as to be freely rollable around the front and rear axis of the machine body (P1 in FIG. 1 of the publication). The actuator (5 in FIG. 1 of the publication) provided on the machine body side and the seedling planting device are connected via a spring (18 in FIG. 1 of the publication). Then, the horizontal inclination of the seedling planting device with respect to the rice field (corresponding to the ground) is detected, and the actuator is operated so that the seedling planting device is maintained in a parallel attitude (corresponding to a predetermined attitude) with respect to the rice field. . As a result, when the actuator operates, its motion is transmitted to the seedling planting device via the spring, and the seedling planting device is operated in a rolling manner. The attachment device is configured so that it can be smoothly rolled.

[0003]

In the above-mentioned structure, the rolling operation of the seedling planting device is slightly delayed by the action of the spring when the actuator is operated. In this case, in a state where the seedling planting device is slightly inclined to the left and right from the parallel posture, even if the rolling operation of the seedling planting device seems to be delayed, the inclination itself of the seedling planting device is small, In particular, there is no possibility that the seedlings will be planted too deep or that they will be planted shallow and become floating seedlings. However, for example, if the seedling planting device tilts greatly from the parallel posture to the right side, the rolling operation of the seedling planting device causes the spring action even if the actuator is used to roll the seedling planting device to the left side to return to the parallel posture. In case of delaying the rolling operation, seedlings will be planted too deep on the right side where the seedling planting equipment is tilted, or shallow planted on the opposite left side, resulting in floating seedlings. May occur. INDUSTRIAL APPLICABILITY The present invention reduces the delay of the rolling operation when the ground working device is particularly inclined significantly, while leaving the advantage that the fine motion of the actuator is absorbed by the spring so that the ground working device can be smoothly rolled. The purpose is to do.

[0004]

A feature of the present invention is that the above-described rolling operation structure of a ground work device for a work vehicle is configured as follows. That is, the ground work device is supported to be freely rotatable around the longitudinal axis of the machine body, the actuator provided on the machine body side and the ground work device are connected via the first spring, and the actuator and the ground work device are further connected. Connecting through the interchange and the second spring,
When the actuator operates within a set range including the center of its operating range, the motion of the actuator is transmitted to the ground work device via the first spring, and when the actuator operates beyond the set range, The first spring, the interchange and the second spring are set so that the operation of the actuator is transmitted to the ground working device via the first spring and the second spring, and the left and right inclination of the ground working device with respect to the horizontal plane or the ground is detected. And a control means for activating the actuator so that the ground work device is maintained in a predetermined posture with respect to the horizontal plane or the ground based on the detected left and right inclination.

[0005]

When configured as described above, for example, as shown in FIG. 1, when the actuator 14 is operating within the set range B including the center A of the operating range of the actuator 14, the operation of the actuator 14 is the first. Since it is transmitted to the ground work device only via the spring 12, the operation of the actuator 14 is not transmitted to the ground work device on the side of the second spring 13 due to the action of the interchange 22. As described above, when the actuator 14 is located within the setting range B, the ground work device is in a state in which the ground working device is not tilted to the left or right from the predetermined posture, and in this state, the fine movement of the actuator 14 is performed. Is absorbed by the first spring 12 and the ground work device is smoothly rolled. In this case, the ground work device is rolling-operated a little later than the operation of the actuator 14, but since the inclination of the ground work device from the predetermined posture is slight, the trouble due to the delay of the rolling operation (particularly in the seedling planting device) The situation where the seedlings are planted too deeply or the plants are shallowly planted and become floating seedlings) does not occur.

Then, for example, as shown in FIG. 2, it is assumed that the ground work device is largely tilted from the predetermined posture to the right side of the drawing and the actuator 14 is largely operated beyond the set range B in order to return it. When the actuator 14 operates in this way, the action of the interchange 22 disappears, and the operation of the actuator 14 in addition to the first spring 12 is transmitted to the ground work device via the second spring 13. As a result, the operation of the actuator 14 is quickly transmitted to the ground work device, and the ground work device is rolled without delaying the operation of the actuator 14. Therefore, a problem due to a delay in the rolling operation when the ground work device is greatly inclined from the predetermined posture (especially in the seedling planting device, seedlings are planted too deeply or shallowly planted, resulting in floating seedlings) However, it is prevented in advance.

[0007]

As described above, the ground work device is largely tilted from the predetermined posture, while leaving the advantage that the fine motion of the actuator is absorbed by the spring so that the ground work device can be smoothly rolled. It has become possible to prevent problems due to a delay in rolling operation at that time, and it is possible to improve the rolling operation performance of the ground work device in the work vehicle.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 6, a seedling planting device 3 (corresponding to a ground work device) is provided at the rear of the machine body supported by the front wheels 1 and the rear wheels 2.
Are linked by a link mechanism 4 and a hydraulic cylinder 5 so as to be able to move up and down, thereby forming a riding type rice transplanter which is an example of a work vehicle. As shown in FIG. 6, in the seedling planting device 3, a planting case 8 including a pair of planting arms 7 is rotatably supported by a rear part of the planting mission case 6 of the seedling planting device 3, and The seedling stand 9 is supported along the guide rails 29 (see FIG. 1) of the planting mission case 6 so as to be reciprocally laterally traversable, and as the planting case 8 rotates, a pair of planting stands 9 are planted. The attachment arms 7 alternately take out the seedlings and plant them on the rice field G (corresponding to the ground).

Next, the lifting control of the seedling planting device 3 will be described. As shown in FIG. 6 and FIG. 4, one grounding float 16 is arranged in the center of the seedling planting device 3 in the left-right direction, and the grounding float 16 has its rear part in the horizontal axis of the support arm 17 of the mission case 6 with planting. It is supported so as to be vertically swingable around the core P2. A position sensor 19 of a potentiometer type is provided at the front end of the planted mission case 6, the position sensor 19 and the front part of the ground float 16 are connected by a rod 20, and the detected value of the position sensor 19 is input to the control device 18. Has been done. As a result, when the ground contact float 16 follows the ground contact with the paddy field G along with traveling with planting,
Based on the detection value from the position sensor 19, the control device 21 operates the control valve 21 to expand and contract the hydraulic cylinder 5 so that the detection value becomes the set value, and the seedling planting device 3
Is automatically moved up and down. Therefore, the seedling planting device 3 is automatically maintained at the set height from the rice field G, and the seedling planting depth is maintained at the set value.

Next, the rolling control of the seedling planting device 3 will be described. As shown in FIGS. 1 and 6, the seedling planting device 3 is rotatably connected around the front-rear axis P1 of the link mechanism 4. Frame 4a at the rear end of the link mechanism 4
A bracket 4b fixed to the screw shaft 10 supports a screw shaft 10 and a motor 15 (corresponding to an actuator) that drives the screw shaft 10 in the forward and reverse directions. Then, a boss member 14 (corresponding to an actuator) provided with a female screw is externally fitted to the screw shaft 10, and the left and right fixed frames 11 and the boss member 14 that support the seedling stand 9 are paired into a left and right pair. 1 spring 12
Are connected via.

As shown in FIGS. 2 and 3, an operating rod 22 (corresponding to interchange) having a pair of left and right stoppers 22a fixed thereto is provided on the upper side of the boss member 14 with the left and right stoppers 22a.
It is slidably supported within the range, and the left and right ends of the operation rod 22 and the frame 11 on the seedling stand 9 side are connected via a pair of second springs 13. Seedling stand 9
A pair of third springs 28 are erected and connected between the rear surface of the seedlings and the frame 4a of the link mechanism 4, and when the seedling stand 9 is laterally fed and driven along the guide rails 29, the feeding drive side third The spring 28 is stretched. A bracket 23 extends from a frame 11 that supports the seedling stand 9, and a weight-type tilt sensor 24 is provided on the bracket 23. The detection value of the tilt sensor 24 (the seedling planting device for a horizontal plane). The horizontal inclination angle of 3) is input to the control device 18.

With the above-described structure, the motor 15 drives the screw shaft 10 in the normal direction by the operation signal from the control device 18 so that the detected value is maintained at the set value based on the detected value of the tilt sensor 24 as the planting travels. The seedling planting device 3 is rolled around the front-rear axis P1 of the link mechanism 4 by rotating the boss member 14 leftward and rightward by performing a reverse operation (corresponding to a control unit). As a result, the seedling planting device 3 is maintained in a horizontal posture (corresponding to a predetermined posture).

In this case, as shown in FIG. 1, the boss member 14
In the setting range B including the center A of the operating range of the boss member 14, when the boss member 14 is driven to move left and right,
4 operation is performed through the first springs 12 on the left and right, and the seedling stand 9
Is transmitted to the frame 11, the boss member 14 on the side of the second spring 13 only moves between the left and right stoppers 22a of the operation rod 22, and the operation of the boss member 14 operates. Is not transmitted to the frame 11 via. As described above, when the boss member 14 is positioned within the setting range B, the urging force applied from the boss member 14 to the seedling planting device 3 is only the urging force of the first spring 12, As shown by the solid line (within the setting range B), the biasing force linearly increases according to the position of the boss member 14. In this state, the seedling planting device 3 is not tilted to the left or right from the horizontal posture,
The seedling planting device 3 is in a state in which the rolling operation is smoothly performed with a slight delay after the operation of the boss member 14. And
When the seedling stand 9 is laterally driven along the guide rail 29, for example, to the right, the weight of the seedling stand 9 tends to tilt the seedling planting device 3 to the right. Since the third spring 28 on the right side is stretched, the seedlings are put on by the operation of the boss member 14 based on the detection of the tilt sensor 24 (the biasing force of the first spring 12) and the biasing force of the third spring 28 on the right side. The table 9 and the seedling planting device 3 are returned parallel to the rice field G.

Then, for example, as shown in FIG. 2, the seedling planting device 3 is largely inclined to the right side of the paper surface, and in order to return it, the boss member 14 is largely moved and driven beyond the set range B to the left side of the paper surface, and the seedlings are moved. Suppose you try to return the planting device 3 to a horizontal position. When the boss member 14 is driven to move in this manner, the boss member 14 contacts one stopper 22a of the operation rod 22, and the boss member 14 moves the operation rod 22 to the left side of the drawing. In such a state, the operation of the boss member 14 in addition to the first spring 12 is transmitted to the frame 11 via the second spring 13, so that the boss member 14
The biasing force applied from the seedling planting device 3 by the first spring 12 and the second spring
It is the sum of the biasing force of the spring 13. As a result, as shown by the solid line in FIG. 5 (outside the setting range B), the biasing force linearly greatly increases in accordance with the position of the boss member 14, and the seedling planting device 3 becomes a boss. The rolling operation is performed without delaying the operation of the member 14. When the seedling stand 9 is laterally driven along the guide rail 29 to the right, for example, the weight of the seedling stand 9 tends to tilt the seedling planting device 3 to the right. Since the third spring 28 on the right side is extended, the operation of the boss member 14 (biasing force of the first and second springs 12 and 13) based on the detection of the above-described tilt sensor 24 and the third spring on the right side. The seedling stand 9 and the seedling planting device 3 are returned parallel to the rice field G by the urging force of 28.

As shown in FIG. 1, a pair of limit switches 25 for detecting that the boss member 14 has reached the left and right stroke ends are provided on the bracket 4b of the link mechanism 4. As a result, when it is detected that the boss member 14 has reached the right or left stroke end, the warning lamp 26 provided on the control panel (not shown) of the aircraft is turned on as shown in FIG. I am configuring. or,
As shown in FIG. 3, a cover 27 that covers the boss member 14 and the screw shaft 10 is fixed to the front surface of the bracket 4b, and a mark 27a is provided at a position of the cover 27 corresponding to the center A of the operating range of the boss member 14. ing. Thereby, the operator can visually confirm how far the boss member 14 is located from the center A to the right or left.

[Other Embodiments] In the above-described embodiment, the first spring 12 and the second spring 13 are attached in the free length state. However, the first spring 12 may be attached in a state where the first spring 12 is slightly extended from the free length state. The second spring 13 may be attached in a slightly extended state from the free length state, or both the first and second springs 12 and 13 may be attached in a slightly extended state from the free length state. A hydraulic cylinder or an electric cylinder may be used instead of the motor 15.
In the above-mentioned embodiment, the seedling planting device 3 is rolled so as to be parallel to the horizontal plane, but the seedling planting device 3 is rolled so as to form a predetermined inclination angle with respect to the horizontal plane. Good. Further, the seedling plant 3 is provided with an inclination sensor for detecting the lateral angle of the seedling planting device 3 with respect to the rice field G instead of the horizontal plane, so that the rice seedlings are parallel to the rice field G and have a predetermined inclination angle with respect to the rice field G. The planting device 3 may be rolled. INDUSTRIAL APPLICABILITY The present invention enables not only a riding-type rice transplanter but also a riding-type direct sowing machine (corresponding to a ground working device) directly connected to the body and a rotary tiller (corresponding to a ground working device) to be freely rolled on the body. It can also be applied to connected agricultural tractors.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Front view of the seedling stand and the area around the seedling planting device

FIG. 2 is a front view showing a state where the seedling stand and the seedling planting device are greatly inclined to the right side of the drawing.

FIG. 3 is a front view of a boss member and a screw shaft cover for rolling the seedling planting device.

FIG. 4 is a diagram showing a relationship among a grounding float, an inclination sensor, a hydraulic cylinder for raising and lowering operation of the seedling planting device, a motor for operating the rolling of the seedling planting device and the like.

FIG. 5 is a diagram showing the relationship between the position of the boss member and the urging forces of the first and second springs applied from the boss member to the seedling planting device.

[Figure 6] Overall side view of the riding type rice transplanter

[Explanation of symbols]

 3 Ground work device 12 1st spring 13 2nd spring 14,15 Actuator 22 Flexible 24 Inclination sensor P1 Front-rear axis A Center of actuator operating range B Setting range G Ground

Claims (1)

[Claims] 1. A ground work device (3) is supported so as to be freely rotatable around a longitudinal axis (P1) of the machine body, and actuators (14) and (15) provided on the machine body side and the ground work device (3) are provided. ) And the first spring (12),
Further, the actuators (14) and (15) are connected to the ground work device (3) through the interchange (22) and the second spring (13), and the actuators (14) and (15) have their working ranges. When operated within a set range (B) including the center (A) of the actuators, the operation of the actuators (14), (15)
The actuators (14), (15) are transmitted to the ground working device (3) via the spring (12).
Is operated beyond the set range (B), the operation of the actuators (14) and (15) causes the first spring (1) to move.
2) and the ground work device (3) via the second spring (13)
The first spring (12) and the interchange (2
2) and the second spring (13) are set, and the ground working device (3) with respect to the horizontal plane or the ground (G)
An inclination sensor (24) for detecting the left / right inclination of the vehicle, and the ground work device (3) is maintained in a predetermined posture with respect to a horizontal plane or the ground (G) based on the detected left / right inclination.
A ground operation device rolling operation structure for a work vehicle, comprising a control means for operating the actuators (14), (15).