JP2695351B2 - Rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a seedling planting device to a traveling machine body so that the seedling planting device can be driven up and down by an actuator so that the tip end of a support arm that can swing up and down with respect to the frame of the seedling planting device is leveled. The rear side of the float is swingably supported vertically, and the support arm is configured to be vertically adjustable and positionally fixable by an operating lever so that the planting depth can be changed. The present invention relates to a rice transplanter equipped with lifting control means for driving and controlling the actuator so as to maintain the ground posture of the seedling planting device in a predetermined state based on the detection result of the vertical movement amount due to the fluctuation of the ground pressure.

[0002]

2. Description of the Related Art In the above rice transplanter, a potentiometer is conventionally used as a detecting means for detecting the amount of vertical movement associated with the fluctuation in ground pressure on the front side of a ground leveling float, as disclosed in, for example, Japanese Patent Laid-Open No. 4-58812. There is a configuration in which this potentiometer is attached to the planted transmission case in a fixed position.

[0003]

However, in the above-mentioned conventional structure, if the relative height of the rear fulcrum of the leveling float with respect to the planting transmission case is changed to change and adjust the seedling planting depth, the standard of the leveling float is obtained. Since an error occurs in the detected value of the potentiometer corresponding to the parallel posture, it is necessary to change and adjust the control reference value of the elevation control each time the planting depth is adjusted, which is a troublesome operation. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a characteristic construction of the present invention, in the rice transplanter described at the beginning, the detecting action portion of the detecting means is supported to the frame through a parallel four-link mechanism, and The detection acting portion is configured to move up and down in conjunction with the up and down movement of the fulcrum portion of the ground leveling float according to the operation of the operation lever.

[0005]

[Operation] When the rear fulcrum of the ground leveling float is moved up and down to adjust the planting depth, the detection function unit that detects the amount of vertical movement associated with the ground pressure change at the front of the ground leveling float also moves up and down in conjunction with it. When the ground posture of the ground leveling float is in a reference posture, for example, in a parallel state to the ground, the detection result by the detecting means can be always kept constant regardless of before and after the planting depth change adjustment. Moreover, since the detection action part is supported by the frame via the parallel four-link mechanism so that it can move up and down, the ground posture becomes constant regardless of the vertical movement, and the detection error caused by the vertical position adjustment is raised and lowered. It can be suppressed to a negligible amount in control.

[0006]

Therefore, although the rear fulcrum position of the ground leveling float is moved up and down in order to adjust the planting depth, the detected value of the vertical movement amount detecting means with respect to the ground reference posture of the ground leveling float in the elevation control is always constant. Can be maintained
A troublesome work such as changing the control reference value every time the planting depth is adjusted is not required, and it is possible to provide the one that can always perform the elevation control operation with high accuracy.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
Figure 2 shows the seedling planting equipment at the rear of the rice transplanter. This seedling planting device comprises a seedling stand 1 on which a seedling for planting is placed and which reciprocates laterally with a constant stroke, and five planting mechanisms for taking out one seedling from the lower end of the seedling stand 1 and planting it. As shown in FIG. 1, it is provided with a few ground leveling floats 3 and the like, and is connected to the rear part of the riding type traveling body via a link mechanism 4 so as to be able to move up and down and to be freely rolled left and right around the longitudinal axis Y. is there. A feed case 6 is provided on a pivotal boss portion 5 formed on the rear link 4a of the link mechanism 4 so as to be relatively rotatable about the longitudinal axis Y.
A square pipe-shaped main frame 7 is connected to the lower portion of the feed case 6 by bolts. The main frame 7 is extended in the lateral direction and is integrally formed of an aluminum drawing material formed into a rectangular tube shape. Power is transmitted to the feed case 6 from the traveling machine body side via a power take-off shaft 8, and this power is transmitted to the lateral feed drive mechanism of the seedling stand 1 and the planting mechanisms 2 installed in the case 6. It is configured to supply. As shown in FIG. 7, on the rear surface side of the main frame 7, three planting cases 9 are cantilevered and connected rearwardly at predetermined intervals with a predetermined interval. The planting mechanism 2 is arranged on each of the left and right sides of the rear part of each planting case 9 of
A single planting mechanism 2 is arranged on the right side of the central planting case to form a five-row planting. That is, the rotation case 11 is rotationally driven via the chain transmission mechanism 10 installed in each planted case 9, and the cam mechanism (not shown) provided in the case 11 rotates with the rotation of the rotation case 11. The planting mechanism 2 is configured so that the tip of the attached planting claw 12 moves up and down while drawing a substantially elliptical locus. And
As shown in FIG. 8, the front-rear power of the power take-off shaft 8 is transmitted to the lateral input shaft 14 via the bevel gear mechanism 13 in the feed case 6, and the seedling stand from the input shaft 14 is transmitted via the gear mechanism. 1 is configured to drive the vertical feed drive shaft 15 that drives the endless rotation belt type vertical feed device 30. The vertical feed drive shaft 15 and the transmission chain 16 are used to rearward the outside of the main frame 7. It is configured to transmit power to the lateral drive shaft 17 located at. The drive shaft 17 extends leftward and rightward at an outer portion on the rear side of the main frame 7 and is interlockingly connected to the front sprocket 10a of each planting case 9 so as to be able to transmit torque. In this manner, the power is branched and transmitted from the feed case 6 to each planting mechanism 2 via the lateral drive shaft 17. Further, as shown in FIG. 9, a lateral feed screw shaft 19 of the seedling placing table 1 is supported on one lateral side of the feed case 6 in a state of being exposed from the case 6.
In contrast, the power is transmitted from the input shaft 14 through the variable seedling-picking frequency changing mechanism 21 in four steps, and the relative lateral feed speed of the seedling stand 1 with respect to the planting mechanism 2 is set in four steps. It is configured to be variable. An outwardly extending portion of the vertical feed drive shaft 15 is supported by a bracket 31 standing upright from the main frame 7. This vertical feed drive shaft 1
5 is configured such that at the stroke end of the seedling placing table 1, a rotary cam 15a formed on the drive shaft 15 abuts on the operating arm 30a of the vertical feeding device 30 to perform vertical feeding operation. A reciprocating spiral groove 27 is formed on the outer peripheral surface of the screw shaft 19, and a top member 28 that engages with the spiral groove 27 is externally fitted to the screw shaft 19. The top member 28 is connected via a connector 29. The seedling stand 1 is linked with the screw shaft 1
The seedling stand 1 is reciprocally moved laterally by rotating 9. The feed case 6 is bolted and fixed by bolts while straddling the upper surface 7b and the rear surface 7a of the main frame 7. In other words, the mounting surface of the feed case 6 is formed in a substantially L shape, and is bolted to the upper surface 7b and the rear surface 7a of the main frame 7, respectively, so that the rigidity of the frame structure is enhanced. In addition, a plate-shaped support member 32 extending from the upper end position of the feed case 6 to the lower end of the main frame 7 over the front wall portion of the feed case 6 and the front surface portion of the main frame 7 is bolted at a plurality of positions. While connecting
A support member 38 jointly fastened to the lower portion of the plate-like support member 32 is configured to support the front side of the pivot support boss 5 to enhance the rigidity at a rolling fulcrum point that supports the entire seedling planting device. I am doing it. Further, a bracket 37 is extended upward from one end of the main frame 7 to support the exposed outer side end portion of the feed shaft 6 of the screw shaft 19, so that the left and right sides of the screw shaft 19 are integrally formed. The feed case 6 fixedly connected to the main frame 7 and the bracket 37 are configured to be accurately supported. The front portions of the left and right ground leveling floats 3, 3 are configured to be vertically movable within a predetermined range. That is, in FIG.
As shown in FIG. 6, a vertical frame 4 supporting the seedling stand 1
7 is formed in a U-shape, and the lower end is attached and fixed to the front surface of the main frame 7, and the vertical frame 47 accommodates the support links 48 for the left and right ground floats 3, 3. The support link 48 is a bracket 49 on the leveling float 3.
The pin 51 erected on the vertical frame 47 is engaged with the elongated hole 50 formed through the pin 51 to allow vertical movement within the elongated hole range. As shown in FIG. 3, an adjusting lever guide 40 for the planting depth adjusting lever 39 and an adjusting lever guide 42 for the seedling picking amount adjusting lever 41 are integrally attached to the plate-like support member 32. As shown in FIG. 4, a cylinder shaft 44 integrally connected to a support arm 43 that supports the rear part of each grounding float 3 so as to be vertically swingable is rotatably supported by a pivot boss 45 on the lower side of the planting case 9. In addition, the cylinder shaft 44 and the planting depth adjusting lever 39 are connected to each other, and the cylinder shaft 44 is rotated to move the rear fulcrum of the leveling float 3 up and down to adjust the planting depth. is there. Further, as shown in FIG. 2, a slide rail 35 provided at the lower end of the seedling placing table 1 and slidably supporting the lower edge of the placed seedling is provided along the seedling longitudinal feeding direction with respect to the seedling placing table 1. The sliding rail 3
The relative position of No. 5 with respect to the seedling stand 1 is changed by operating the seedling-picking-amount adjusting lever 41 so that the seedling-picking amount by the planting claws 12 can be changed. Along with the vertical adjustment of the planting depth adjusting lever 39, the vertical oscillating amount based on the ground pressure variation of the ground leveling float 3 at the center, that is, the ground height is detected via the parallel four-link mechanism 46, and the seedling planting device is detected. The potentiometer PM for performing the automatic raising / lowering control of 1 is configured to be integrally moved up and down so that the reference posture of the central ground leveling float 3 as the height detection sensor is always kept constant regardless of the planting depth adjustment. There is. More specifically, based on the detection result by the potentiometer PM, the control device S (an example of the elevating control means) equipped with a microcomputer controls the elevating hydraulic cylinder CY of the seedling planting device.
The control valve V of 1 is controlled to maintain the height of the seedling planting device above ground at a predetermined value. A pair of swing links 54, 5 swingable about a front-rear axis with respect to a bracket 53 fixedly extending from a plate-shaped support member 32 with a support tool 52 (an example of a detection operation section) that supports the potentiometer PM.
5, the swinging link 54 is extended outward, and the engaging recess 57 is engaged with the operation pin 56 fixed to the planting depth adjusting lever 39.
When the float fulcrum moves upward with the vertical swing operation of the adjusting lever 39, the support tool 52 moves upward, and when the float fulcrum moves downward, the support tool 52 moves downward. 52 is configured to move up and down in conjunction with each other. The support tool 52 is a parallel four-link mechanism 46.
Since it is supported by, the ground posture is always kept constant regardless of vertical movement. The support 52 includes:
A restricting portion 59 for restricting the detection operation range of the detection operation arm 58 of the potentiometer PM is formed. The main frame 7 is not limited to a square pipe shape, and may have any shape such as a round cylinder shape or a triangular cylinder shape. Good.

[Other Embodiments] A potentiometer PM is used to detect vertical movements due to fluctuations in ground pressure on the front side of the leveling float 3.
Instead of being electrically detected by, the mechanical detection may be performed using a release wire. In this case, the float side end portion of the outer wire is referred to as a detection acting portion.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

[Figure 1] Overall side view of rice transplanter

FIG. 2 is a side view of the seedling planting apparatus.

FIG. 3 is a rear view of the potentiometer mounting portion.

FIG. 4 is a side view of the potentiometer mounting portion.

FIG. 5 is a side view of the support portion of the left and right ground leveling float.

FIG. 6 is a front view of a support portion of the left and right ground leveling float.

FIG. 7 is a plan view showing a transmission system.

FIG. 8 is a sectional view of the feed case.

FIG. 9 is a rear view showing the drive structure of the seedling stand.

[Explanation of symbols]

 3 Leveling Float 7 Frame 39 Operation Lever 43 Support Arm 46 Parallel Quadruple Link Mechanism 52 Detection Action Section CY Actuator S Elevation Control Means PM Detection Means

Claims (1)

(57) [Claims] 1. A support arm (4) that is vertically movable with respect to a frame (7) of a seedling planting device, which is connected to a traveling machine body by an actuator (CY) so as to be driven up and down.
The rear side of the leveling float (3) is pivotally supported at the tip of (3) so as to be vertically swingable, and the support arm (43) is configured to be vertically adjustable and positionally fixable by an operating lever (39), so that the planting depth can be increased. The ground level of the seedling planting device can be changed based on the detection result of the detection means (PM) that detects the amount of vertical movement associated with the fluctuation of the ground pressure on the front side of the leveling float (3). Lifting control means (S) for driving and controlling the actuator (CY) so as to maintain a predetermined state.
A rice transplanter equipped with: a detection unit (52) of the detection means (PM) supported on the frame (7) via a parallel four-link mechanism (46); A rice transplanter in which (52) is configured to move up and down in association with the vertical movement of the fulcrum portion of the leveling float (3) in accordance with the operation of the operation lever (39).