JP4510591B2 - Seedling planting mechanism in rice transplanter - Google Patents

Description

  The present invention relates to a seedling planting mechanism for splitting seedlings one by one from a seedling mat on a seedling stand in a rice transplanter and planting the seedlings on a field scene.

  In general, this kind of seedling planting mechanism is provided with a split claw projecting in the direction of the seedling stage at the tip of a seedling planting case that reciprocates in the vertical direction with respect to the field scene. In the middle of the downward movement toward the center, the tip of the split claw passes through the seedling stage to split one seedling from the seedling mat on the seedling stage, and then the tip of the split claw By entering the farm scene, the one seedling is planted in the farm scene.

  In this case, in the conventional seedling planting mechanism, for example, as described in Patent Document 1 and the like, an extrusion shaft extending in the longitudinal direction of the split claw is slidable in the axial direction of the seedling planting case. A push piece for the seedling divided by the split claw is provided at the projecting end of the push-out shaft from the seedling planting case, and connected to the push-out shaft inside the seedling planting case. In conjunction with the reciprocating movement of the seedling planting case, the pushing lever is configured to rotate upward against the spring means at the time of transition from the bottom dead center of the descending stroke to the ascending stroke, By providing the reciprocating motion so that it is rotated downward by the spring force of the spring means at the bottom dead center of the downward stroke, the push-out shaft is moved forward by the upward rotation of the push-out lever. And retraction toward the root portion from the distal portion of the split nail, the extrusion axis at a downward rotation of the push-out lever is a configuration that connects to advance movement toward the tip end portion of the split nail.

According to this configuration, the tip of the split claw in the seedling planting case splits one seedling from the seedling stage in the descending process and enters the field scene while holding this one seedling. In addition, when the pushing lever is pivoted downward, the pushing shaft is moved forward toward the tip of the split claw by the spring force of the spring means, thereby forcibly pushing out the seedling of the strain. Therefore, the certainty of seedling planting can be improved and the planting posture can be stabilized.
JP 2000-139146 A

  In the conventional seedling planting mechanism, a soft elastic body, such as rubber, attached to the lower surface of the push lever at the end of the forward movement toward the tip of the split claw on the push shaft, It is configured to set by touching.

  However, the downward rotation of the push lever is performed by the spring force stored in the spring means when the push lever rotates in the upward direction, so that the soft elastic body provided on the lower surface of the push lever Is strongly struck against the inner bottom surface of the hollow seedling planting case by the spring force of the spring means, and the impact generated by this hammering is directly transmitted to the seedling planting case. However, there is a problem that considerably large noise and vibration are generated by the hitting.

  In particular, the seedling case is generally made of a light alloy such as an aluminum alloy in order to reduce the weight, but the light alloy such as an aluminum alloy is heavier than carbon steel that is heavy and has high rigidity. Since it is rich in resonance with sound and vibration, the noise and vibration generated by hitting the soft elastic body are further amplified.

  In addition, when the soft elastic body moves together with the pushing lever, lubricant such as lubricating grease filled in the seedling planting case leaks out of the seedling planting case by the movement of the soft elastic body. Not only is the fear large, but the soft elastic body moves in the lubricant, so that the wear of the soft elastic body is large and the stroke of the push lever changes, and the speed of the push lever also changes the soft elastic body. There was also a problem that the planting posture of the seedlings on the field scene deteriorated because the body was slowed by exercising in the lubricant.

  This invention makes it a technical subject to eliminate these problems.

In order to achieve this technical problem, the present invention provides a first planting case in which a split claw is provided and a seedling planting case that reciprocates up and down between a seedling stage and a field scene extends in the longitudinal direction of the split claw. A shaft is provided so as to be slidable in the axial direction thereof, and an extruding piece for the seedling divided by the split claws is provided at a protruding end from the seedling planting case on the extrusion shaft, while the seedling planting is provided. A push lever connected to the push shaft inside the case is interlocked with the reciprocating movement of the seedling case, and in the reciprocating movement, when the transition is made to the rising stroke beyond the bottom dead center of the falling stroke. upward and rotated against the spring means, in time of approximately bottom dead center of the downward stroke of its reciprocating, seedling planting mechanism made provided so as to rotate downward at play it forces in the spring means In the seedling planting case, rubber etc. Fitted with a soft elastic body, the soft elastic body, a corner portion which is bent in a crank shape in the middle of the push-out lever, a structure of abutment at the end of its downward rotation, the soft elastic body is loaded The boss portion is provided on the bottom plate of the seedling planting case, the boss portion is directly and integrally connected to one side plate of the seedling planting case, and the other side plate of the seedling planting case is interposed via a rib. The boss part is integrally connected.

The present invention can greatly reduce noise and vibration generated in a seedling planting case .

And it can reduce reliably that the planting posture of the seedling with respect to a field scene deteriorates.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, drawings when embodiments of the present invention are applied to a riding type multi-row planting rice transplanter will be described.

  In the figure, reference numeral 1 denotes an 8-row riding type rice transplanter. The rice transplanter 1 has a traveling machine body 2 supported by a pair of left and right front wheels 3 and a rear wheel 4, and a rear part of the traveling machine body 2. The traveling machine body 2 is provided with an engine 6 and a steering seat 7.

  The seedling planting device 5 includes a transmission case 8 to which power is transmitted from the engine 6, eight rotary seedling planting mechanisms 9 disposed in parallel in the transmission case 8 at appropriate intervals in the lateral direction, It is comprised by the seedling mounting base 10 arrange | positioned back and downward inclined so that it may reciprocate, and the several float 12 arrange | positioned so that the surface of the field scene 11 might be slid between each said seedling planting mechanisms 9. Yes.

  Each of the seedling planting mechanisms 9 is configured as shown in FIGS.

  That is, a drive shaft 13 that is supported by the transmission case 8 in a horizontal and horizontal direction and is driven by the engine 6 is provided. A portion of the drive shaft 13 that protrudes from the transmission case 8 has a side view. An oval rotating case 14 is detachably fixed, and the rotating case 14 is rotated counterclockwise by the drive shaft 13 as indicated by an arrow A in a side view of the rice transplanter 1. A sun gear 15 is rotatably fitted on the drive shaft 13 in the case 14, and the sun gear 15 is locked to the transmission case 8 through a connecting member 35 so as not to rotate. .

  An operation shaft 16 for a pusher, which will be described later, is pivotally supported in parallel with the drive shaft 13 at a position where the distance from the drive shaft 13 is equal to the outer peripheral portion of the rotating case 14, that is, both left and right end portions. A hollow planting shaft 17 is rotatably fitted on both operating shafts 16 in the rotating case 14.

  The end portions of the planting shaft 17 and the operating shaft 16 project outward from the side surface of the rotating case 14, and the projecting ends of the planting shafts 17 are opened to the upper surface with a light alloy such as an aluminum alloy. A hollow seedling planting case 18 is attached with a bolt 19, and a split claw 20 is fixed to the tip of each seedling planting case 18 in a posture position toward the seedling mounting table 10, while the operation The tip of the shaft 16 protrudes into the hollow portion of the seedling planting case 18, and a cam 21 for pushing operation is fixed to this portion, and on the upper surface of the seedling planting case 18, A lid body 33 is attached for sealing.

  A planetary gear 22 having the same number of teeth as the sun gear 15 is fitted on each planting shaft 17, while the sun gear 15 and the planetary gear 22 are connected to the rotating case 14. An intermediate gear 23 that meshes at the same time is provided to constitute a gear train mechanism, and the planting shaft 17 is rotated once in the clockwise direction by the gear train mechanism during one counterclockwise rotation in the rotating case 14. By doing so, each seedling planting case 18 is configured to reciprocate between the seedling mounting table 10 and the field scene 11 in a state where the divided claws 20 hold the posture toward the seedling mounting table 10. ing.

  In this case, the sun gear 15, the planetary gear 22 and the intermediate gear 23 constituting the gear mechanism are offset as described in, for example, Japanese Patent Publication Nos. 63-20486 and 63-74413. By constructing a non-circular gear such as a core gear, the tip of the split claw 20 in each seedling planting case 18 draws an elliptical closed-loop motion locus 24 that is long in the vertical direction as shown in FIG. It is composed.

  Each seedling planting case 18 is provided with an extrusion shaft 25 extending in parallel with the longitudinal direction of the divided claw 20 so as to be slidable in the axial direction, and an extrusion piece 26 having a U-shaped cross section is provided at the lower end thereof. The upper end of the push-out shaft 25 protrudes into the seedling planting case 18, and the upper end of the push-out shaft 25 extends vertically into the seedling planting case 18. The distal end of the pushing lever 28 pivotally attached to the pin 27 so as to swing and rotate forward is moved forward in the direction in which the pushing shaft 25 moves toward the tip of the split claw 20 by the downward turning of the pushing lever 28. Then, the push-out shaft 25 is connected via the connecting piece 34 so that the push-out shaft 25 moves backward from the tip end portion of the split claw 20 toward the root portion by the upward rotation of the push-out lever 28.

  In the seedling planting case 18, spring means 29 for biasing the push lever 28 in the downward direction is provided between the push lever 28 and the lid 33. By contacting the base end with the outer peripheral surface of the push-out actuating cam 21, the tip of the split claw 20 in each seedling planting case 18 is rotated by the rotation of the rotating case 14 in conjunction with the rotation of the rotating case 14. Accordingly, when the reciprocating motion comes close to the bottom dead center at the lowering lower limit, the pushing lever 28 is rotated downward by the pressing force of the spring means 29, and each seedling case 18 is attached to the rotating case 14. The push-out lever 28 is configured to rotate upward against the spring means 29 when it moves upward from the bottom dead center in the reciprocating motion as it rotates.

  In this case, the seedling planting case 18 has a base end side portion attached to the planting shaft 17 in the seedling planting case 18 located in a portion close to the rotating case 14. The seedling planting case 18 has a shape that is bent in an outward crank shape in a plan view so that the tip side portion on which the split claws 20 and the push-out shaft 25 are provided is located at a position away from the rotating case 14. With the crank shape as described above, the push lever 28 mounted inside is also bent outwardly in a plan view.

  The bottom plate 18a of the seedling planting case 18 is integrally provided with a boss portion 31 projecting into the seedling planting case 18, and a soft elastic body 32 such as rubber can be detachably attached to the boss portion 31. The push-out lever 28 is in contact with the upper surface of the soft elastic body 32 at the end of its downward rotation.

  In this case, the push-out lever 28 is bent in a crank shape in plan view as described above, and the first corner located on the proximal end side of the take-out lever 28 among the two corner portions bent in the crank shape. The corner portion 28a is configured to come into contact with the soft elastic body 32, and the pushing lever 28 is pressed in a downward direction at a position almost directly above the first corner portion 28a. The spring means 29 for biasing is disposed.

  Further, as shown in FIGS. 4 and 6, the boss portion 31 loaded with the soft elastic body 32 is directly and integrally connected to one side plate 18b in the seedling planting case 18, and the other side plate 18c. Are connected together via a rib 36.

  In this configuration, as the rotation case 14 revolves in the arrow A direction, the seedling planting case 18 is centered on the planting shaft 17 in the direction opposite to the arrow A direction by the same rotation angle as that of the revolution. Since each seedling planting case 18 rotates, each of the seedling planting cases 18 swivels so that the split claw 20 reciprocates in the up-down direction in a state of facing the seedling placing table 10. When descending from top to bottom on the side facing the upper surface of the table 10, after dividing one seedling from the seedling mat 30 on the seedling mounting table 10 with the split claws 20 at the tip, The tip of the split claw 20 enters the farm scene 11 in the vicinity of the bottom dead center of the lower limit of the descent.

  At this time, since the pushing lever 28 in the seedling planting case 18 is rotated downward by the spring force of the spring means 29, the pushing piece 26 moves forward toward the tip of the split claw 20. One seedling at the tip of the split claw 20 is planted in the field scene 11 so as to be pushed out.

  When planting of the seedling is finished, the split claw 20 moves upward from the farm scene 11. Simultaneously with this upward movement, the push-out lever 28 rotates upward against the spring means 29, so that the push-out piece 26 moves backward from the tip of the split claw 20 toward the root portion.

  The pushing lever 28 in the seedling planting case 18 contacts the soft elastic body 32 at the end of the downward rotation thereof, thereby restricting the end of the pushing piece 26 in the forward movement.

  In this case, when the soft elastic body 32 is provided on the push lever 28 side as in the prior art, the soft elastic body 32 is in contact with the inner bottom surface of the seedling planting case 18 with the spring means. Since the impact is generated by the spring force of 29 and the impact generated by the impact is directly transmitted to the seedling planting case 18, considerably large noises and vibrations are generated.

  On the other hand, in the present invention, as described above, the soft elastic body 32 is provided on the seedling planting case 18 side, so that the pushing lever 28 contacts the soft elastic body 32. Since the impact force in is buffered by the soft elastic body 32 and is transmitted to the seedling planting case 18, noise and vibration generated in the seedling planting case 18 are rich in resonance in the seedling planting case 18. Even when it is made of a light alloy such as an aluminum alloy, it can be greatly reduced.

  The push lever 28 is bent in a crank shape in plan view, and comes into contact with the soft elastic body 32 by contacting the soft elastic body 32 at the bent corner 18a. The area of the elastic elastic body 32 is larger than that when the pushing lever 28 is straight in a plan view, and the surface pressure when the pushing lever 28 contacts the soft elastic body 32 becomes small. Can be improved.

  Then, the spring means 29 that presses and urges the push lever 28 downward is a portion of the push lever 28 that contacts the soft elastic body 32, that is, a bend of the push lever 28. Since the push lever 28 is in contact with the soft elastic body 32, the spring force in the spring means 29 is bent on the push lever 28 when the push lever 28 is in contact with the soft elastic body 32. It is possible to avoid acting as a moment.

  In addition, the soft elastic body 32 can stably support the soft elastic body 32 by being fitted in the boss portion 31 provided integrally with the bottom plate 18a in the seedling planting case 18. Since the bottom plate 18a of the seedling planting case 18 can be reinforced by the boss portion 31 provided integrally therewith, the push lever 28 contacts the soft elastic body 32. Noise and vibration can be further reduced.

  Moreover, the boss 31 is directly integrated with one side plate 18b of the seedling planting case 18, or is integrated with the other side plate 18c via a rib 36, or one side plate 18b. Since the bottom plate 18a can be more strongly reinforced by being integrated directly with the other side plate 18c via the rib 36, the above-described effects can be promoted.

  Furthermore, the pin 27 for pivotally attaching the push lever 28 to the seedling case 18 is in the form of a bolt with a head having a hexagonal hole, as shown in FIG. A sealing ring 27 ′ is fitted to the base, inserted through one side plate 18 b in the seedling planting case 18, and then screwed into a female screw hole in the other side plate 18 c. Yes.

  With this configuration, there is no need to configure the pin 27 as a stepped pin, and there is an advantage that the diameter can be reduced and the sealing performance by the ring 27 'can be improved.

It is a side view of a riding type rice transplanter. It is a top view of a riding type rice transplanter. It is an enlarged side view of the seedling planting mechanism in FIG. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 4. FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5.

DESCRIPTION OF SYMBOLS 1 Rice transplanter 2 Traveling machine body 3, 4 wheels 5 Seedling planting device 8 Transmission case 9 Seedling planting mechanism 10 Seedling stand 11 Farm scene 12 Float 13 Drive shaft 14 Rotating case 18 Seedling case 20 Dividing claw 21 Pushing cam 25 Pushing Shaft 26 Pushing piece 28 Pushing lever 28a Corner portion 29 Spring means 32 Soft elastic body

Claims (1)

A seedling planting case that has split claws and reciprocates up and down between the seedling platform and the field scene is provided with an extrusion shaft that extends in the longitudinal direction of the split claws so as to be slidably supported in the axial direction. An extruding piece for the seedling divided by the split claw is provided at the protruding end of the extruding shaft from the seedling planting case, while an extruding lever connected to the extruding shaft is provided inside the seedling planting case. In conjunction with the reciprocating movement of the seedling planting case, the reciprocating movement rotates upward against the spring means at the time when the revolving movement exceeds the bottom dead center of the falling stroke and shifts to the rising stroke. in time of approximately bottom dead center of the inner downward stroke, the seedling planting mechanism consisting provided so as to rotate downward at play it forces in the spring means,
Fitted with a soft elastic material such as rubber to the seedling planting cases, the soft elastic body, wherein a corner portion which is bent in a crank shape in the middle of a push-out lever, a structure of abutment at the end of its downward rotation ,
A boss portion loaded with the soft elastic body is provided on a bottom plate of the seedling planting case, and the boss portion is directly and integrally connected to one side plate of the seedling planting case, and the other side of the seedling planting case A seedling planting mechanism in a rice transplanter, wherein the boss is integrally connected to a face plate via a rib .

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