JPH0134567B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a device for raising and lowering a planting section of a riding-type rice transplanter, and in particular to a device that performs swing (elevation) control and pitching control of a planting section that is attached to a traveling vehicle body so that it can be raised and lowered via a lifting device. be.

[Conventional technology]

In this type of riding rice transplanter, the lifting device is equipped with a swing control mechanism to allow the planting part to slide following the top soil of the rice field and to perform highly accurate planting work with a constant planting depth. The swing control mechanism is activated by sensing the vertical movement of the float installed in the attachment part, and the planting part is moved up and down via the lifting device.
The planting depth is kept constant. On the other hand, there is also a system in which a pitting control mechanism is provided at the connection between the lifting device and the planting section to control pitching of the planting section.

[Problem to be solved by the invention]

However, there is no correlation between the swing control mechanism and the pitching control mechanism, and there has never been a device in which the two mechanisms are used in an organically linked manner. Therefore, the present invention first corrects pitching by vertically moving the float in the planting section, and then performs swing correction to make the planting section follow the topsoil so that it is always parallel to the rice field. An object of the present invention is to provide a device for raising and lowering a planting part of a riding type rice transplanter, which enables planting work to be carried out at an appropriate planting depth.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a riding rice transplanter in which a planting section is attached to a traveling vehicle body via a lifting device so as to be able to rise and fall, and the lifting device includes a pitching control mechanism for the planting section, and a swing control mechanism for the planting section. a control mechanism, and when both of the control mechanisms work simultaneously,
It is characterized by providing a priority mechanism in which the pitching control mechanism operates first and the swing control mechanism operates thereafter.

[Effect]

With the above configuration, the planting section is always maintained horizontally with the field surface, and seedlings are planted properly.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a running vehicle body equipped with a pair of left and right front wheels 2 and rear wheels 3,
An engine 4 is mounted on the front part of this running vehicle body 1,
A planting part 7 is attached to the rear part via an elevating link 6 which is rotated by a swing hydraulic cylinder 5 and moves up and down. The lifting link 6 is an upper link 6a.
Rotating shafts 8 and 9 fixed to both ends of the lower link 6b are pivotally connected to the traveling vehicle body 1, and the rotating shaft 8
The lower end of the swing arm 10 whose upper end is fixed to
It is attached to the piston rod 5a of the hydraulic cylinder 5 via a buffer spring 11, and both links 6a,
The rear end portions of 6b are connected by a vertical link 6c to form a parallel link. The vertical link 6c has its lower end pivoted to the rear end of the lower link 6b, and has an elongated hole 12 formed in its upper end in the front-rear direction, into which a pin 13 protruding from the upper link 6a is inserted. I support it. Further, a balance spring 14 is installed between the upper position of the long hole 12 of the vertical link 6c and the position forward of the pin 13 of the upper link 6a, and the upper end of the vertical link 6a and the upper link 6
Between the upper edges of a is a pitching hydraulic cylinder 15.
is installed. A support rod 17 protruding forward from the main body 16 of the planting section 7 is connected to a pivot position between the vertical link 6c and the lower link 6b and at an intermediate position between the vertical link 6c. The planting section 7 is supported by the main body 16 in a forward-inclined manner, and faces a seedling platform 18 on which seedlings are placed and reciprocated in the left-right direction with a predetermined stroke, and the inclined lower end of the seedling platform 18. A front plate 19 is fixed to the main body 16 side and has a seedling take-out port 20, and a seedling take-out port 20.
a planting body 21 which is pivotally supported by a main body 16 and moves vertically in a predetermined trajectory, and takes out seedlings in the form of a single plant from a seedling take-out port 20 and plants them on the rice field;
It consists of a float 22 and the like arranged on the lower side of the main body 16, and the seedling platform 18 is partitioned into a plurality of rows in the front and rear direction (four rows in the drawing), and a seedling take-out port 20 is provided corresponding to each partition row. and an implant 21 are provided. The float 22 is a center float 2
2a and its left and right side floats 22b, 22
As is clear from FIG. 2, the center float 22a has its front part protruding forward from the front part of the side floats 22b, and its rear part is located in front of the rear parts of the side floats 22b. The rear portions of the center float 22a and the side floats 22b are pivotably supported on the main body 16 via a bracket 23 and a link mechanism so that they can be adjusted up and down, and are adjusted up and down by a planting depth adjustment lever 24. We are trying to adjust the planting depth of seedlings to be planted. center float 2
The front part of 2a is a pantograph-type vertical movement link 2 with one end pivoted on a support rod 25 protruding forward from the main body 16 and the other end pivoted on the upper surface of the float 22a.
6, and along this link 26, there is provided a hydraulic switching valve 27 which is switched by the vertical movement of the float 22a, and constitutes a sensing float. Further, the front part of the side float 22b is connected to the main body 16 by a pantograph type vertical movement link 28.
Supported by A hydraulic pump 29 is provided on the front side of the engine 4, and the hydraulic cylinders 5, 15 and the valve 2 are connected to the hydraulic pump 29 via an oil pipe 30.
Pressure oil is sent to 7. This hydraulic circuit is shown in FIG. 3. The valve 27 is of a 4-port, 3-position type, and is switched by the vertical movement of the float 22a to expand and contract the hydraulic cylinders 5 and 15, and In addition to moving the planting section 7 up and down, the planting section 7 can also be switched manually.
It is a device for raising and lowering. As is clear from the circuit diagram in FIG. 3, when the valve 27 is switched, the hydraulic cylinders 5 and 15 expand and contract at the same time, but since the hydraulic cylinder 15 is provided with the balance spring 14, the hydraulic cylinder 15, i.e. The pressure on the pitching side is greater than the pressure on the swinging side, and therefore, the priority mechanism is configured so that the pitching operation is operated with priority over the swinging operation. In such a configuration, the rice transplanter is introduced into the field, places the planted seedlings on the seedling platform 18, contracts the swing hydraulic cylinder 5 and pitching hydraulic cylinder 15, and transplants the rice via the lifting link 6. The float 22 moves down the attaching part 7 and reaches the surface A shown in FIG.
With the front and rear wheels 2 and 3 of the traveling vehicle body 1 in contact with the tiller B, the planting section 7 is driven and at the same time the traveling vehicle body 1 is driven to perform planting work. At the start of the planting work, the bottom surfaces of the floats 22 are in horizontal contact with the field surface A, and at this time, the hydraulic switching valve 27 is maintained at the neutral position, the vertical links 26 and 28 are maintained in a well-balanced manner, and the vertical links 6c In this case, the pin 13 is held at approximately the middle position of the elongated hole 12 by a balance spring 14. During the planting operation, when the traveling vehicle body 1 moves up and down due to the ups and downs of the tiller B, and the planting section 7 starts moving up and down, the float 22 rotates around the pivot position of the bracket 23. vertical movement link 26,2
8 expands and contracts, the hydraulic switching valve 27 is switched, and the swinging hydraulic cylinder 5 and pitching hydraulic cylinder 15 expand and contract, causing the planting section 7 to move up and down. At this time, the hydraulic cylinders 5 and 15 expand and contract at the same time, but since the balance spring 14 is provided along the hydraulic cylinder 15, the pitching occurs due to the action of the balance spring 14 before the lifting link 6 is swung by the hydraulic cylinder 5. The float 22 is corrected and moves up and down (swings), and the bottom surface of the float 22 is always held horizontally with the rice field A and slides. Therefore, the planting depth of the seedlings planted by the planting body 21 is constant, and the planting posture is also good. Furthermore, in the center float 22a, since the rotating position of the bracket 23 is the rear end position of the float, the rear part of the float does not sink into the field A when correcting pitching, and the valve 22a
7 has good switching sensitivity and increases flow sensing accuracy.

【Effect of the invention】

As explained above, according to the planting part raising and lowering device of the riding type rice transplanter of the present invention, the planting part is attached to the traveling vehicle body via the lifting device, and the lifting device is provided with the swing mechanism and the pitting mechanism. When both mechanisms work at the same time, we have provided a priority mechanism that gives priority to the pitching mechanism, so that pitching correction is always performed when the traveling vehicle body moves up and down to move the planting section up and down during planting work. It is possible to perform highly accurate planting work by first swinging and holding the planting part in a horizontal proper position to keep the planting depth and planting posture of the seedlings constant.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the main body of the rice transplanter, FIG. 2 is a plan view thereof, and FIG. 3 is a hydraulic circuit diagram. 1... Running vehicle body, 2... Front wheel, 3... Rear wheel, 4
...Engine, 5...Hydraulic cylinder for swing,
6... Lifting link, 7... Planting section, 8, 9... Rotating shaft, 10... Swing arm, 11... Buffer spring, 12... Elongated hole, 13... Pin, 14... Balance spring , 15... Hydraulic cylinder for pitching,
16... Main body, 17... Support rod, 18... Seedling mounting stand, 19... Front plate, 20... Seedling take-out port, 21...
... Planting body, 22 ... Float, 23 ... Bracket, 24 ... Planting depth adjustment lever, 25 ... Support rod, 26 ... Vertical movement link, 27 ... Hydraulic switching valve, 28 ... Vertical movement Link, 29...hydraulic pump, 30...oil pipe.

Claims (1)

[Scope of Claims] 1. A riding rice transplanter in which a planting section is attached to a traveling vehicle body via an elevating device so as to be able to be raised and lowered, wherein the elevating device is provided with a pitching control mechanism and a swing control mechanism for the planting section. . A planting section up-and-down device for a riding rice transplanter, characterized in that, when both of the control mechanisms work simultaneously, a priority mechanism is provided in which the pitting control mechanism operates first and the swing control mechanism operates thereafter.