JP6132794B2 - Paddy field machine - Google Patents

Description

  The present invention relates to a paddy field work machine provided with a support arm and a float positioned below the support arm.

  For example, the following patent document 1 describes a float structure of a conventional paddy field work machine. In the technique described in Patent Document 1, a connecting shaft (in which “Support Arm (12)” in Patent Document 1)) and a float (“Grounding Float (11)” in Patent Document 1) are swingably connected. In Patent Document 1, “support shaft (13)”) is provided. Although not particularly shown in Patent Document 1, the connecting shaft is provided with a torsion spring capable of urging the float backward and downward. The torsion spring includes a coil portion supported by the connecting shaft, a front portion extending forward from the coil portion and detachable from the support arm, and extending rearward from the coil portion to the upper surface of the float. And a rear portion to be abutted.

  By providing such a torsion spring in the float structure, the light rear side is biased downward as compared to the front side of the float, and the front-back balance of the float is improved.

Japanese Patent Laid-Open No. 2001-224212 (FIG. 3)

  However, in the conventional technique, when the front part of the torsion spring is removed from the support arm, the front part of the torsion spring is pressed against the upper surface of the float with almost no gap by the biasing force of the torsion spring. It becomes. For this reason, when performing the operation | work which reinstalls the front part of a torsion spring with respect to a support arm etc., the operation which lifts the front part of a torsion spring takes time, and it became difficult to perform the maintenance of a float.

  In view of the above circumstances, it has been desired to provide a paddy field work machine capable of easily performing float maintenance.

  A paddy field machine according to the present invention is wound around a support arm, a float positioned below the support arm, a connection shaft that oscillates the support arm and the float, and the connection shaft. A torsion spring capable of urging the float backward and downward, the coil spring being supported by the connecting shaft on the torsion spring, and extending forward from the coil portion with respect to the support arm. A detachable front part; and a rear part extending rearward from the coil part and contacting the upper surface of the float, the front part being attached to the support arm and the rear part being the An attachment state that abuts against the upper surface of the float and biases the float backward and downward, and the front portion is detached from the support arm and abuts against the upper surface of the float and the rear The torsion spring is configured so that the state can be changed to a detached state in which the upper part of the float is in contact with the upper surface of the float, and the front part is disposed between the front part and the float in the removed state of the torsion spring. A space for lifting is formed.

  According to the present invention, when the torsion spring is detached, a space for lifting the front part is formed between the front part of the torsion spring and the float. Therefore, it becomes possible to easily insert a finger or a tool into the space between the front part of the torsion spring and the float, and the operation of lifting the front part of the torsion spring can be easily performed. For this reason, it becomes easy to perform the operation | work etc. which reattach the front part of a torsion spring with respect to a support arm, for example. Therefore, according to the present invention, the float can be easily maintained.

  In the present invention, it is preferable that the front portion is provided with a bent portion protruding upward, and the space is formed by the bent portion in the detached state of the torsion spring.

  According to this configuration, a space for lifting the front portion of the torsion spring is preferably ensured by an easy process of bending the torsion spring so as to protrude upward, and the maintainability of the float can be improved.

  In the present invention, the support arm is provided with a lateral lateral hole, and the front end of the front portion is provided with a hook portion that is hooked to the lateral hole in the attached state of the torsion spring, and the bent portion. Is preferably the base end of the hook portion.

  According to this configuration, the torsion spring is in the attached state by hooking the hook portion at the front end of the front portion of the torsion spring in the lateral side hole provided in the support arm. The hook portion at the front end of the front portion of the torsion spring has a bending base end, but a bent portion that forms a space for lifting the front portion of the torsion spring also serves as the base end of the hook portion. Therefore, a torsion spring that is easy to handle can be manufactured at a relatively low cost without excessively increasing the number of times of bending.

  In the present invention, the hook portion approaches the lateral hole, a first extending portion extending laterally from the proximal end in a direction away from the lateral hole, a folded portion folded back from the first extending portion, and A second extending portion extending laterally from the folded portion in a direction, and the second extending portion is configured to contact the upper surface of the float in the detached state of the torsion spring. It is preferable that

  According to this configuration, in the detached state of the torsion spring, the second extension portion extending laterally in the direction approaching the lateral hole of the support arm in the torsion spring is brought into contact with the upper surface of the float. Therefore, in the detached state of the torsion spring, the torsion spring is less likely to make point contact with the upper surface of the float, and scratches or the like are less likely to occur on the upper surface of the float.

  In the present invention, in the removed state of the torsion spring, the distance from the upper surface of the float to the bent portion is larger than the distance from the upper surface of the float to the axis of the coil portion. Is preferred.

  According to this configuration, a large space for lifting the front part of the torsion spring is secured, and a finger, a tool, or the like can be inserted into the space between the front part of the torsion spring and the float with a margin. it can.

It is a top view of a riding type rice transplanter. It is a side view of a riding type rice transplanter. It is a top view of the periphery of a float structure. It is a longitudinal cross-sectional view of a peripheral view of the periphery of the float structure. It is a side view which shows the torsion spring of a removal state. It is a longitudinal cross-sectional view of the periphery of the leveling member in a side view. It is a fragmentary sectional view of the front view of the periphery of a drooping prevention mechanism.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As FIG. 1 and FIG. 2 show, the riding type rice transplanter W which is an example of a "paddy field machine" is comprised by the 8-row planting type, for example. The riding type rice transplanter W is provided with a traveling machine body 13 configured to be self-propelled by a pair of left and right front wheels 11 and a rear wheel 12. An engine 14 is provided at the front of the traveling machine body 13. In the central part of the traveling machine body 13, there is provided a control unit 16 in which a driver's seat 15 on which an operator is boarded is disposed. An 8-row seedling planting device 17 is connected to the rear portion of the traveling machine body 13 via a link mechanism 18 so as to be movable up and down.

  As shown in FIGS. 1, 3, 4, 6, and 7, the seedling planting device 17 includes a planting frame 19 that is connected to and supported by a link mechanism 18. As shown in FIG. 3, the planting frame 19 is provided with a main frame 19 a made of a square steel pipe material that faces the left and right sides of the machine body. As shown in FIG. 2, the seedling planting device 17 includes a planting frame 19 that is supported by a seedling platform 20, eight seedling planting mechanisms 21, five float structures, and the like.

  As shown in FIGS. 1 and 2, eight mat-like seedlings are placed on the seedling table 20. The seedling table 20 is guided by the sliding plate 22 at the lower end side, and can be driven to reciprocate in a lateral direction with a constant stroke. On the lateral outer side of the sliding plate 22, a protection member 23 supported by the machine body lateral outer end of the main frame 19 a is provided. The seedling platform 20 is provided with a belt-type vertical feeding device 24 that feeds the seedling placed on the seedling platform 20 downward by a predetermined amount each time the seedling platform 20 reaches the stroke end of the reciprocating lateral feed movement. It has been.

  The seedling planting mechanism 21 is configured to plant the mat-like seedlings placed on the seedling setting table 20 in the field. Four planting drive cases 25 are provided extending from the main frame 19a toward the rear of the machine body. The seedling planting mechanism 21 is provided as a pair on each of the left and right sides of each planting drive case 25, and each seedling planting mechanism 21 is rotatably provided to the planting drive case 25.

[Float structure]
As shown in FIG. 2, the five float structures include three float structures A provided with a T-type float 27 for two-level lands and two float structures 28 provided with a U-type float 28 for one-level lands. And a float structure B. Between the float structures A, the float structures B are respectively arranged. Here, as an example, a float structure A provided with a T-type float 27 as shown in FIG. 3 will be described in detail.

  As shown in FIGS. 3, 4, and 6, the float structure A includes an adjustment lever 30, a float support shaft 31, a support arm 32, a float 27, a bracket 33, a connection shaft 34, and a torsion. And a spring 35.

  The adjustment lever 30 is a member that adjusts the seedling planting depth. As shown in FIG. 4, the adjustment lever 30 is inserted through a guide groove 36a of a lever guide 36 fixed to the main frame 19a.

  As shown in FIG. 3, the float support shaft 31 is a pipe-like member that extends along the lateral direction of the fuselage. As shown in FIGS. 3, 4, and 6, the float support shaft 31 is configured so that the adjustment lever 30 swings around the first horizontal axis X <b> 1 of the float support shaft 31 along the guide groove 36 a of the lever guide 36. The rotation is adjusted by the operation. As can be understood from FIG. 4, when the float support shaft 31 is rotated and adjusted, the support arm 32 is swung up and down, and the three floats 27 and two floats 28 shown in FIG. It is adjusted up and down with respect to the attached frame 19.

  As shown in FIG. 3, the support arm 32 is provided in a pair of left and right. As shown in FIGS. 3 and 4, one end of each support arm 32 is fixed to the float support shaft 31. One support arm 32 of the left and right is provided with a plurality of lateral holes 32a penetrating therethrough.

  As shown in FIGS. 4 and 5, the float 27 is located below the support arm 32. The float 27 has a T shape in plan view.

  As can be understood from FIGS. 3 and 4, the bracket 33 has a U-shaped shape opened upward. The bracket 33 is fixed to the upper surface 27 a of the float 27. The other end portion of each support arm 32 is connected to the left and right end portions of the bracket 33 via a connecting shaft 34 which faces sideways so as to be rotatable around the axis of the connecting shaft 34.

  As shown in FIG. 3, the connecting shaft 34 is in a horizontal direction and connects the support arm 32 and the float 27 so as to be swingable.

  As shown in FIGS. 3 to 5, the torsion spring 35 is wound around the connecting shaft 34. The torsion spring 35 can bias the float 27 downward. The torsion spring 35 is supported by being wound around the connecting shaft 34, a front part 41 extending forward from the lower end part of the coil part 40, and extending rearward from the lower end part of the coil part 40. And a rear portion 42.

  As shown in FIGS. 4 and 5, the front portion 41 is detachable from the support arm 32. The front portion 41 is provided with a bent portion 41a protruding upward. The bent portion 41 a is a portion that bends the first half portion of the front portion 41 that extends linearly downward toward the upper surface 27 a side of the float 27 with respect to the second half portion of the front portion 41. That is, the front part 41 is bent in an L shape in a side view. The rear part 42 extends rearward from the coil part 40 and comes into contact with the upper surface 27 a of the float 27. At this time, the rear end portion of the rear portion 42 is bent sideways so that it is difficult to make point contact with the upper surface 27 a of the float 27.

  As shown in FIGS. 3 and 4, the front half portion of the front portion 41, that is, the front end of the front portion 41, is provided with a hook portion 41 b that is hooked on the lateral hole 32 a when the torsion spring 35 is attached. ing. The bent portion 41a is a base end of the hook portion 41b. The hook portion 41b includes a first extension portion 41ba, a folded portion 41bb, and a second extension portion 41bc. The first extending portion 41ba is a portion that extends laterally from the base end in a direction away from the lateral hole 32a. The folded portion 41bb is a portion that is folded from the first extending portion 41ba.

  The torsion spring 35 is configured to be changeable between an attached state as shown in FIGS. 3 and 4 and a detached state as shown in FIG. When the torsion spring 35 is set in the attached state, the front portion 41 is attached to the support arm 32 and the rear portion 42 is brought into contact with the upper surface 27a of the float 27 so that the float 27 is urged downward. At this time, the biasing force of the torsion spring 35 can be adjusted depending on which of the plurality of lateral holes 32a of the support arm 32 the second extending part 41bc of the hook part 41b is hooked. It has become.

  On the other hand, as shown in FIG. 5, when the torsion spring 35 is removed, the front portion 41 is detached from the support arm 32 and abuts against the upper surface 27 a of the float 27, and the rear portion 42 is the upper surface 27 a of the float 27. Abut. At this time, the front portion 41 is in a state where the peripheral portion of the bent portion 41 a is separated from the upper surface 27 a of the float 27 in the vertical direction. In other words, when the torsion spring 35 is removed, the bent portion 41 a of the torsion spring 35 forms a space S for lifting the front portion 41 between the front portion 41 of the torsion spring 35 and the upper surface 27 a of the float 27. The

  In the removed state of the torsion spring 35, the second extending portion 41bc is configured to contact the upper surface 27a of the float 27. In the removed state of the torsion spring 35, the distance from the upper surface 27a of the float 27 to the bent portion 41a rather than the distance t1 from the upper surface 27a of the float 27 to the second horizontal axis X2 (corresponding to the “axis”) of the coil portion 40. The t2 is configured to be large. Further, the distance t2 from the upper surface 27a of the float 27 to the bent portion 41a is larger than the distance from the upper surface 27a of the float 27 to the lower end of the coil portion 40 that is the base end of the front portion 41.

  For this reason, in the removed state in which the torsion spring 35 is detached from the support arm 32, a finger, a tool, or the like is inserted into the space S below the bent portion 41a so that the torsion spring 35 can be easily attached to the upper surface 27a of the float 27. You can lift it up. For this reason, the maintenance regarding the float 27 can be easily performed.

[Protective member]
As shown in FIG. 3, the protection member 23 is supported so as to be rotatable with respect to the attachment member 50 fixed to the outer end of the main frame 19a. The attachment member 50 is formed in a U shape in a plan sectional view. The attachment member 50 is provided with a pair of through holes 50a and a pair of first insertion holes 50b. The protection member 23 includes a first front and rear part 51, an extension part 52, a second front and rear part 53, a mounting piece 54, and a positioning pin 55. The first front / rear part 51 is supported through the through hole 50 a of the mounting member 50. A plate 56 is fixed to one end of the first front and rear portion 51, and a spring member 57 is disposed between the mounting member 50 and the plate 56 on the outer periphery of the first front and rear portion 51. The attachment piece 54 has a flat plate shape along the extending direction of the extending portion 52 and is fixed to the first front and rear portion 51 by welding or the like. The attachment piece 54 is provided with a second insertion hole 54a.

  The positioning pin 55 is inserted into the first insertion hole 50b of the attachment member 50 and the second insertion hole 54a of the attachment piece 54, and then the fixing portion 55a is formed by bending the tip. The fixing portion 55a is fixed to the extending portion 52 by welding or the like, and the midway portion 55b of the positioning pin 55 is fixed to the mounting piece 54 by welding or the like. Thereby, the positioning pin 55 is fixed over the first front-rear part 51 and the extension part 52.

  The protective member 23 rotates around the longitudinal axis Y, thereby positioning the second front / rear portion 53 on the lateral outer side of the sliding plate 22 and protecting the sliding plate 22 with the second front / rear portion 53 ( 1 to 3) and the second front and rear portion 53 are grounded and can be changed to a stand state (not shown) that functions as a stand of the seedling planting device 17.

  In this manner, as shown in FIG. 3, the positioning pin 55 is bent to form the fixing portion 55a, and the fixing portion 55a is fixed to the extension portion 52. The protection member 23 can be reinforced with a simple configuration as compared with the case where the positioning pin is inserted linearly into the protruding portion.

(Drip prevention mechanism)
As shown in FIGS. 1, 4, and 7, the float 27 is provided with a sag prevention mechanism 60 that prevents the float 27 from sagging. The sagging prevention mechanism 60 includes a support member 61, a U-shaped member 62, and a linkage rod 63.

  As shown in FIGS. 4 and 7, the support member 61 is a plate-like member, and is fixed to the front portion of the main frame 19a with a plurality of bolts 64 and the like. The U-shaped member 62 is a member that is U-shaped and has an upward opening when viewed from the front, and is fixed to the front surface of the support member 61 by welding or the like. The U-shaped member 62 is provided with a vertical hole 62a and a horizontal hole 62b. The connecting rod 63 includes an L-shaped attachment portion 63a in a front view, a slide portion 63b extending downward from the lower end of the attachment portion 63a, and a lateral contact portion 63c positioned on the lower end side of the slide portion 63b. , Is provided. The attachment portion 63a is inserted through the vertical hole 62a and the horizontal hole 62b of the U-shaped member 62. A snap pin 62 c is inserted into a pin hole at a portion protruding laterally from the U-shaped member 62. The slide portion 63 b is inserted into an engagement hole 27 b provided in the flange at the front end portion of the float 27, and is movable relative to the float 27. The contact portion 63c contacts the lower surface of the float 27, and does not come out of the engagement hole 27b.

  Since such a sag prevention mechanism 60 is provided, as can be understood from FIGS. 4 and 7, the float 27 can swing up and down within a certain range, while the contact portion 63 c of the linkage rod 63 The float 27 does not fall forward from the sagging restriction position. Moreover, since the linkage rod 63 is positioned on the main frame 19a, the position of the contact portion 63c with respect to the main frame 19a is kept constant. As a result, the sagging restriction position of the float 27 does not change. With such a sag prevention mechanism 60, the sag of the float 27 can be suitably prevented with a simple configuration with a small number of parts.

[Leveling material]
As shown in FIGS. 1 to 4 and 6, the float spindle 31 is provided with a leveling member 70. The leveling member 70 is disposed between the float structures. As shown in FIG. 4, the leveling member 70 includes a supported portion 70a and a leveling portion 70b. The supported portion 70 a is a part attached to the float support shaft 31, and is attached so as to rotate integrally with the float support shaft 31 by a band body 70 c attached around the float support shaft 31. The leveling unit 70b has a rake-like shape, and is a part that performs leveling in contact with the farm surface. The leveling portion 70b extends rearwardly downward from the front end of the supported portion 70a.

  As described above, since the leveling member 70 is provided on the float support shaft 31 located behind the main frame 19a, the rear wheel located forward of the main frame 19a is understood from FIG. 12, the leveling member 70 is less likely to interfere. Moreover, since the leveling part 70b rotates integrally with the float support shaft 31, impurities are difficult to stay on the leveling part 70b. Moreover, since the leveling part 70b rotates integrally with the float support shaft 31, when the planting depth of the seedling is changed, the leveling part 70b rotates with the rotation of the float support shaft 31, and after the change The leveling height automatically follows the seedling planting depth.

[Another embodiment]
(1) In the above embodiment, in the removed state of the torsion spring 35, the distance t2 from the float 27 to the bent portion 41a is larger than the distance t1 from the float 27 to the second horizontal axis X2 of the coil portion 40. Although what is comprised is shown as an example, it is not restricted to this. For example, in the detached state of the torsion spring, the distance from the float 27 to the second horizontal axis of the coil portion may be smaller than the distance from the float 27 to the bent portion.

  (2) In the above embodiment, the second extending portion 41bc is configured to contact the upper surface 27a of the float 27 when the torsion spring 35 is removed. I can't. For example, when the torsion spring 35 is removed, a portion different from the second extending portion 41bc may be configured to abut on the upper surface 27a of the float 27.

  (3) In the above embodiment, in the torsion spring 35, the bent portion 41a is shown as an example of the bent base end of the hook portion 41b. However, the present invention is not limited to this. A torsion spring in which the position of the bent portion is different from the portion serving as the base end of bending of the hook portion may be used.

  (4) In the above embodiment, the hook portion 41b of the torsion spring 35 is hooked in the lateral hole 32a penetrating the support arm 32 in the attached state of the torsion spring 35. However, the present invention is not limited to this. For example, the hook portion 41 b of the torsion spring 35 may be hooked on a ring member or the like fixed to the support arm 32.

  (5) In the above embodiment, an example in which the front portion 41 of the torsion spring 35 is bent in an L shape in a side view is shown, but the present invention is not limited thereto. For example, the front portion of the torsion spring may have another shape such as an upward curved shape or a square shape in a side view.

  (6) In the above-described embodiment, the front portion 41 of the torsion spring 35 is provided with the bent portion 41a. However, the present invention is not limited to this. For example, another torsion spring having a straight front portion may be used. In this case, the distance between the second horizontal axis of the coil portion of the torsion spring and the upper surface 27a of the float 27 is secured sufficiently large. In the removed state of the torsion spring, a space for lifting the front part is formed between the front part of the torsion spring and the upper surface 27a of the float 27.

  (7) In the above embodiment, the T-type float 27 is shown as an example of the “float”, but is not limited thereto. For example, another float such as a U-shaped float 28 in the float structure B or an L-shaped float may be used.

  (8) In the above-described embodiment, an 8-row riding type rice transplanter is shown as an example, but the present invention is not limited thereto. It may be a 1-row planting type to 7-row planting type, or a 9-row or more riding type rice transplanter.

  The present invention can be applied to other paddy field machines such as a riding type direct seeding machine in addition to the above riding type rice transplanter.

27: Float 27a: Upper surface 32: Support arm 32a: Horizontal hole 34: Connection shaft 35: Torsion spring 40: Coil portion 41: Front portion 41a: Bending portion 41b: Hook portion 41ba: First extension portion 41bb: Folding portion 41bc : Second extension part 42: rear part t1, t2: distance S: space W: riding type rice transplanter (paddy field machine)
X2: Second horizontal axis (axis)

Claims (5)

A support arm;
A float located below the support arm;
A connecting shaft for swingably connecting the support arm and the float;
A torsion spring wound around the connecting shaft and capable of biasing the float downward and downward,
The torsion spring includes a coil portion supported by the connecting shaft, a front portion extending forward from the coil portion and detachable from the support arm, and extending rearward from the coil portion. A rear portion that is in contact with the upper surface of the float,
An attachment state in which the front portion is attached to the support arm and the rear portion is in contact with an upper surface of the float to urge the float downward, and the front portion is detached from the support arm and the float The torsion spring is configured to be changeable in a removed state in which the rear portion is in contact with the upper surface of the float and the rear portion is in contact with the upper surface of the float.
A paddy field machine in which a space for lifting the front part is formed between the front part and the float in the removed state of the torsion spring. The front portion is provided with a bent portion bent downward,
The paddy field work machine according to claim 1, wherein the space is formed by the bent portion in the detached state of the torsion spring. The support arm is provided with a lateral hole,
At the front end of the front portion, in the attached state of the torsion spring, a hook portion that is hooked in the lateral hole is provided,
The paddy field machine according to claim 2, wherein the bent portion is a base end of the hook portion. The hook portion has a first extending portion extending laterally from the base end in a direction away from the lateral hole, a folded portion folded back from the first extending portion, and the folded portion in a direction approaching the lateral hole. A second extending part extending laterally from the part,
The paddy field machine according to claim 3, wherein the second extension portion is configured to abut on an upper surface of the float in the detached state of the torsion spring.   The distance from the upper surface of the float to the bent portion is larger than the distance from the upper surface of the float to the axis of the coil portion in the detached state of the torsion spring. The paddy field machine according to any one of the above.

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