JP2013063056A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tiller that prevents mud of a field from adhering to a side plate of a rotary cover during tilling operation.SOLUTION: The rotary tiller is configured to incline a tilling claw part of an eccentric claw 23 attached to an end of a tilling claw shaft 30 to a central direction of the tilling claw shaft 30 and gradually widen a spacing between the tilling claw part of the eccentric claw 23 and the side plate 25 of the rotary cover relatively toward a downstream direction of the rotary direction of the tilling claw 23.

Description

  The present invention relates to a rotary tillage device connected to the rear of a work vehicle such as a tractor, and more particularly, to a tillage claw and a structure of a rotary cover that covers the tillage claw.

  In general, a rotary cultivator connected to the rear of a work vehicle such as a tractor to cultivate a farm has a plurality of tilling claws covered with a rotary cover. The tilling claw is attached to a tilling claw shaft disposed in the rotary cover, and the cultivation claw is rotated by rotating the tilling claw shaft so as to plow the field scene.

  Conventionally, in order to cultivate the field scene below the bearing part of the tilling claw shaft, tilling claws (so-called eccentric claws) that are offset from the base part of the tilling claw to the side plate side of the rotary cover are located at both ends of the tilling claw shaft. An attached rotary tiller has been devised (see Patent Document 1).

JP-A-63-248301

  However, in the rotary tiller described in Patent Document 1, the tilling claw portion of the eccentric claw and the side plate of the rotary cover are arranged in parallel, and the interval (gap) between the side plate and the eccentric claw is narrow. In addition, mud in the field where the eccentric claws are scraped off may adhere to the side plate of the rotary cover. In such a case, there is a risk of causing an early wear of the eccentric claw due to friction between the eccentric claw and the adhering mud, or contact between the adhering mud and the eccentric claw, resulting in a power loss due to a decrease in rotation of the eccentric claw. In addition, there is a case where a clot or the like is clogged between the side plate and the eccentric claw. When the clot or the like is clogged, there is a possibility that the tilling claw shaft cannot be rotated and the tilling work cannot be performed.

  Therefore, the present invention is configured to gradually increase (widen) the distance between the eccentric claw attached to the end of the tilling claw shaft and the side plate of the rotary cover toward the downstream in the rotation direction of the tilling claw. Provided is a rotary tillage device that solves the problem.

The present invention includes a tilling claw (22) for tilling a farm scene, a tilling claw shaft (30) to which a plurality of the tilling claws (22) are attached, a top plate (26) covering the top of the tilling claw (22), and In a rotary tiller (1) comprising a rotary cover (21) having a side plate (25) covering the side of the tillage claw (22),
Among the tilling claws (22), the tilling claws (23, 31) attached to the ends of the tilling claws shaft (30) include the base (23a, 31a) attached to the tilling claws shaft (30) and the tilling An offset part (23g, 31c) for shifting the claw (23, 31) toward the side plate (25), and a curve from the offset part (23g, 31c) toward the rotation direction of the tilling claw (23, 31) And has a tilling claw portion (23d, 31b) extending,
The distance between the tilling claw portion (23d, 31b) and the side plate (25) is relatively increased gradually toward the downstream direction of rotation of the tilling claw (23, 31). Features.

  As for the said tilling nail (23) attached to the edge part of the said tilling nail axis | shaft (30), the said tilling nail | claw part (23d) inclines in the center direction of the said tilling nail axis | shaft (30).

  The cultivating claw (31) attached to the end portion of the cultivating claw shaft (30) is configured such that the base (31a) of the cultivating claw is attached to the cultivating claw shaft (30) so as to be inclined with respect to the rotation direction. The tilling claw portion (31b) is inclined in the central direction of the tilling claw shaft (30).

  The said side plate (25) is inclined and arrange | positioned with respect to the rotation direction of the said tilling nail | claw (31).

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on description of a claim by this.

  According to the first aspect of the present invention, the distance between the tillage claw attached to the end of the tillage claw shaft and the side plate of the rotary cover gradually increases toward the downstream side in the rotation direction of the tillage claw. It is possible to suppress the mud of the farm field from adhering to the side plate. Thereby, while being able to prevent clogging of a lump etc. between a side plate and a tilling nail part, early wear of the tilling nail part by friction with mud adhering to a side board and a tilling nail part can be prevented. In addition, it is possible to prevent power loss due to friction between the mud adhering to the side plate and the tilling claw portion, thereby improving work efficiency, and further, it is possible to facilitate cleaning of the rotary cover.

  According to the second aspect of the present invention, the tilling claw portion of the tilling claw attached to the end of the tilling claw shaft is inclined in the central direction of the tilling claw shaft, so that it is easily possible without changing the arrangement of the side plates of the rotary cover. The distance between the tilling claw attached to the end portion of the tilling claw shaft and the side plate of the rotary cover can be gradually increased relatively toward the downstream side in the rotation direction of the tilling claw.

  According to the invention which concerns on Claim 3, the base part of the cultivation nail | claw attached to the edge part of a cultivation nail | claw axis | shaft is attached to the said cultivation claw axis | shaft inclined with respect to a rotation direction, and a cultivation nail | claw part is the center direction of the said cultivation nail | claw axis | shaft. For example, using a conventional tilling claw (eccentric claw) in which the tilling claw part itself is not tilted, the distance between the tilling claw that can be easily attached to the end of the tilling claw shaft and the side plate of the rotary cover Can be gradually increased toward the downstream side in the rotation direction of the tilling nail.

  According to the invention according to claim 4, since the side plate of the rotary cover is arranged to be inclined with respect to the rotation direction of the tilling nail, without using a special shape for the tilling nail or special attachment, The distance between the tilling claw easily attached to the end of the tilling claw shaft and the side plate of the rotary cover can be gradually increased toward the downstream side in the rotation direction of the tilling claw.

The side view which shows the state at the time of tillage work of the rotary tiller which concerns on this embodiment. The top view of a rotary tillage apparatus. The side view of the rotary cover of a rotary tillage apparatus. It is a figure which shows a tilling nail, Comprising: (a) is a side view, (b) is a top view, (c) is a front view. The top view which shows the state at the time of the cultivation work of the rotary tiller by 1st Embodiment. The top view which shows the state at the time of the cultivation work of the rotary tiller by 2nd Embodiment. The top view which shows the state at the time of the cultivation work of the rotary tiller by 3rd Embodiment. The side view which shows the state at the time of the cultivation work of a rotary tiller. (A) is a cross-sectional side view of the rotary cover of a rotary tiller, (b) is a cross-sectional side view of the fixing member which fixes a mud adhesion prevention board. The side view which shows the state at the time of the cultivation work of a rotary tiller. (A) is a sectional side view which shows the structure of the connection part of a toolbar and a bracket, (b) is a cross-sectional rear view which shows the structure of the connection part of a toolbar and a bracket. (A) is a sectional side view which shows the structure of the connection part of a toolbar and a bracket, (b) is a cross-sectional rear view which shows the structure of the connection part of a toolbar and a bracket. The side view which shows the state at the time of the non-plowing work which raised the rotary plowing apparatus.

  Hereinafter, embodiments of a rotary tiller according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the rotary tiller 1 includes a body of a tractor 2 that is a towing vehicle via a three-point link mechanism 6 including an upper hitch 3 and two lower links 5 and an auto hitch 10. Connected to the rear. The top link 3 is connected to a bracket 11 provided on the body of the tractor 2, and the lower link 5 is connected to a lift arm 9 via left and right lift rods 7. A hydraulic cylinder (not shown) is interposed in one of the left and right lift rods 7, and the rotary tiller 1 is swingably connected by expansion and contraction of the hydraulic cylinder.

  As shown in FIG. 2, a gear case 12 to which power from a PTO shaft (not shown) of the tractor 2 is input is provided at the center of the rotary tiller 1. A pair of top masts 13 are provided. One end of a telescopic rod 16 having an adjustment handle 15 is attached to the top mast 13, and the other end of the telescopic rod 16 is attached to a support arm 17. A tool bar 19 for attaching a tail wheel or a vertical machine is attached to one end of the support arm 17.

  As shown in FIGS. 1 and 2, a rotary cover 21 is provided below the gear case 12. The rotary cover 21 is mainly composed of a top plate 26 that covers the top of the tilling claws 22 and left and right side plates 25 that cover the sides of the tilling claws 22. The rotary cover 21 is supported by the top plate 26 to level the field. A rear cover 29 is provided behind the rotary cover 21. The left and right side plates 25 of the rotary cover are provided with rear side covers 27 for covering the space of the side plate 25 between the rear cover 29 and the rotary cover.

  A tilling claw shaft 30 is rotatably provided in the rotary cover 21, and a plurality of tilling claws 22 are attached to the tilling claw shaft 30 as shown in FIG. 3. Further, the tilling claw attached to the end of the tilling claw shaft 30 among the tilling claws 22 includes an eccentric claw 23 arranged in an offset manner. One of the left and right side plates 25 is integrally attached to the chain case 20, and the power from the gear case 12 is transmitted to the tilling claw shaft 30 via the chain case in the chain case 20.

  Next, the eccentric claw 23 according to the first embodiment will be described. Here, the eccentric claw 23 is a cultivating claw that cultivates a farm scene, and is attached to an end of the cultivating claw shaft 30 to cultivate a farm scene below a bearing portion that supports the cultivating claw shaft 30. It is. As shown in FIG. 4A, the eccentric claw 23 is formed in a side view shape, and a base portion 23a that is a base portion of the eccentric claw formed in a rectangular shape is formed. As shown in FIGS. 4B and 4C, bent portions 23b and 23c are provided at the tip of the base portion 23a, and the bent portions 23b and 23c cause the eccentric claw 23 to be displaced toward the side plate 25. An offset portion 23g to be moved is configured. A tip end of the offset portion 23g is formed with a tilling claw portion 23d that curves and extends in the rotation direction of the tilling claw 23. The tilling claw portion 23d is provided with a bent portion 23e. As shown in FIG. 4 (b), the tilling claw portion 23d is inclined from the bent portion 23e to the tilling claw portion 23d, and the eccentric claw 23 is attached to the tilling claw shaft 30 as shown in FIG. When this is done, the tilling claw portion 23 d ahead of the offset portion 23 g is inclined toward the center of the tilling claw shaft 30. Due to this inclination, the spacing (gap) between the tilling claw portion 23d of the eccentric claw 23 attached to the tilling claw shaft 30 and the side plate 25 gradually increases (spreads) from the offset portion 23g toward the downstream in the rotational direction. . Further, as shown in FIG. 4C, the tilling claw portion 23d has an inclined portion 23f for facilitating scraping of mud in the field.

  Next, the operation of the rotary tiller 1 configured as described above will be described. In order to cultivate the field with the rotary cultivator 1, the operator moves the rotary cultivator 1 to the rear part of the tractor 2 and then moves to the cultivator. When the operator puts the rotary tiller at the work start position and connects the PTO clutch of the tractor 2, the engine power (rotation) is transmitted into the gear case 12 of the rotary tiller 1 via the PTO shaft. The rotation transmitted into the gear case 12 is transmitted to the tilling claw shaft 30 via a chain (not shown) in the chain case 20, and the tilling claw shaft 30 is moved in the direction of the arrow shown in FIG. 5 by the transmitted rotation. Rotate to. The tilling claw 22 and the eccentric claw 23 enter the soil while crushing the mud soil in the field by the rotation of the tilling claw shaft 30, and cultivate the field while scraping the crushed soil mass M and the like. (See FIG. 1).

  As described above, since the gap between the tilling claw portion 23d and the side plate 25 is gradually increased toward the downstream side in the rotation direction of the eccentric claw 23, the mud in the field that has been lifted up by the eccentric claw 23 during the tilling operation is removed from the side plate 25. Adhering (adhering) to can be suppressed. Thereby, it is possible to prevent clogs M (see FIG. 5) crushed by the eccentric claw 23 between the side plate 25 and the tilling claw portion 23d and the eccentric claw 23 rotating with the mud adhering to the side plate 25. It is possible to prevent early wear of the tilling claw portion 23d due to friction with the tilling claw portion 23d. Further, it is possible to improve the working efficiency by preventing power loss due to friction between the mud adhering to the side plate 25 and the tilling claw portion 23d. Further, when cleaning the rotary cover 21, the mud of the adhering side plate is dropped. Since no labor is required, the cleaning work can be facilitated.

  Further, since the tilling claw portion 23d of the eccentric claw 23 attached to the end portion of the tilling claw shaft 30 is inclined toward the center of the tilling claw shaft 30, the tilling claw shaft 30 can be easily formed without changing the arrangement of the side plates 25. The distance between the tilling claw 23d of the eccentric claw 23 attached to the end and the side plate 25 of the rotary cover can be gradually increased toward the downstream side in the rotation direction of the eccentric claw 23.

  In this embodiment, when the eccentric claw 23 is attached to the cultivation claw shaft 30 by providing the bending claw 23e to the cultivation claw portion 23d of the eccentric claw 23, the cultivation claw portion 23d is arranged in the center direction of the cultivation claw shaft 30. By tilting, the spacing between the tilling claw portion 23d and the side plate 25 is gradually increased toward the downstream side in the rotation direction of the eccentric claw 23. However, the present invention is not limited to this, and as shown in FIG. By attaching the base portion 31a of the conventional eccentric claw 31 where the tip of the tilling claw portion 23d itself is not inclined to the attachment holder 30a of the tilling claw shaft 30 while being inclined with respect to the rotation direction of the tilling claw shaft 30, A configuration may be adopted in which the gap between the tilling claw portion 31b and the side plate 25 is gradually increased toward the downstream side in the rotation direction of the eccentric claw 31 (second embodiment).

  As described above, since the base portion 31a of the eccentric claw 31 is attached to the attachment holder 30a of the tilling claw shaft 30 while being inclined with respect to the rotation direction of the tilling claw shaft 30, it is easy to use the conventional eccentric claw 31. The distance between the tilling claw portion 31 b and the side plate 25 of the rotary cover 21 can be gradually increased toward the downstream side in the rotation direction of the eccentric claw 31.

  Moreover, since the eccentric nail | claw attached to the tilling nail | claw axis | shaft 30 can be made into the conventional eccentric nail | claw 31, it is not necessary to newly process a bending part in the eccentric nail | claw 31, and manufacturing cost can be held down. .

  Further, as shown in FIG. 7, the front side (front side in the traveling direction) end portion 25 a of the side plate 25 is transverse to the rear side (rear side in the traveling direction) end portion 25 b of the side plate 25. The side plate 25 is disposed so as to be inclined with respect to the rotation direction of the eccentric claw 31, and the interval between the cultivation claw portion 31b and the side plate 25 of the rotary cover 21 is set to the rotation direction of the cultivation claw. A configuration in which the width gradually increases toward the downstream side (third embodiment) is also possible.

  As described above, since the side plate 25 is disposed so as to be inclined with respect to the rotation direction of the eccentric claw 31, when attaching the eccentric claw 31 to the tilling claw shaft 30, it is easily cultivated without tilting the eccentric claw 31. The distance between the claw portion 31 b and the side plate 25 of the rotary cover 21 can be gradually increased toward the downstream side in the rotation direction of the eccentric claw 31.

  Moreover, since the eccentric nail | claw attached to the tilling nail | claw axis | shaft 30 can be made into the conventional eccentric nail | claw 31, it is not necessary to newly process a bending part in the eccentric nail | claw 31, and manufacturing cost can be held down. .

  Next, a different form from the above-mentioned embodiment is demonstrated along FIG.8 and FIG.9. However, the same number is attached | subjected about the same structure of the above-mentioned embodiment, and the description is abbreviate | omitted.

  Inside the top plate 26 of the rotary cover 21, as shown in FIGS. 8 and 9A, a mud adhesion preventing plate 32 is attached on one side. The mud adhesion preventing plate 32 is made of stainless steel, and the mud adhesion preventing plate 32 is fixed to the top plate 26 so as to be swingable in the vertical direction by a fixing member 33 as shown in FIG.

  As shown in FIG. 9 (b), the fixing member 33 penetrates the holes 26 a and 32 a provided in the top plate 26 and the mud adhesion preventing plate 32 and is welded to the mud adhesion preventing plate 32. The nut 35 is screwed to the tip of the P button 38, the washer 36 is pressed against the top plate 26 and the mud adhesion preventing plate 32 by the nut 35, and is disposed between the top plate 26 and the mud adhesion preventing plate 32. And a spring 37.

  Next, the operation of the rotary tiller 1A configured as described above will be described. As shown in FIG. 8, the rotary tiller 1 </ b> A is pulled by the tractor 2 and tills the field scene while the tilling claws 22 and the eccentric claws 23 rotate. The tilling claw 22 and the eccentric claw 23 enter the soil while crushing the mud in the field, and plow it while scraping the crushed soil mass M and the like. At this time, the soil mass M scraped up is pressed against the mud adhesion preventing plate 32 by the rotation of the tilling claw 22 and the eccentric claw 23. The mud adhesion preventing plate 32 swings upward when the earth mass M is pressed, and then swings downward by a spring 37 disposed between the top plate 26 and the mud adhesion preventing plate 32.

  As described above, the mud adhesion preventing plate 32 is attached to the inner side of the top plate 26 of the rotary cover 21 by the fixing member 33 so as to be swingable in the vertical direction. Even if the mud M is pressed against the mud, the mud M can be made difficult to adhere to the mud adhesion preventing plate 32.

  Further, since the mud adhesion preventing plate 32 swings up and down (vibrates) during the tillage work, even if the soil mass M adheres to the mud adhesion preventing plate 32, the mud adhesion preventing plate 32 vibrates and easily peels off. can do.

  Next, another embodiment different from the above-described embodiment will be described with reference to FIGS. However, the same number is attached | subjected about the same structure of the above-mentioned embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 10, a tail wheel 47 supported by a column 40 via a bracket 39 is attached to the tool bar 19 attached to one end of the support arm 17. As shown in FIG. 11 (b), a round pipe 41 is welded and attached to the bracket 39 vertically, and the round pipe 41 is inserted into a square pipe 42. The tip 41a of the round pipe 41 protrudes through the square pipe 42, and a C-ring 43 is attached to the tip 41a for preventing the square pipe 42 from coming off. In addition, as shown in FIG. 11A, the round pipe 41 is provided with a regulating member 45 for regulating the rotation of the round pipe 41 in the square pipe 42. The square pipe 42 is inserted into the tool bar 19, and the square pipe 42 is fixed so as to be movable in the left-right direction by a bolt 47 screwed into a nut 46 welded to the upper surface of the tool bar 19. .

  Next, the operation of the rotary tiller 1B configured as described above will be described. As shown in FIG. 10, the operator attaches the tail wheel 47 to the tool bar 19 in order to adjust the depth of tillage, and pulls the rotary tiller 1 </ b> B with the tractor 2 to perform tillage work. When the operator operates the three-point link mechanism 6 to raise the rotary tiller 1B in order to turn the tractor 2 at the headland, the round pipe 41 is moved into the square pipe 42 as shown in FIG. To rotate. By the rotation of the round pipe 41, the bracket 39 and the support column 40 are rotated in the arrow direction shown in FIG. Then, as shown in FIG. 13, the tail wheel 47 moves downward in the direction of the arrow shown in FIG. 13, and when the regulating member 45 comes into contact with the pipe surface in the square pipe 42, The rotation of the round pipe 41 is restricted and the rotation of the round pipe 41 is stopped. When the rotation of the round pipe 41 stops, the rotation of the bracket 39 and the support column 40 also stops, and the tail wheel 47 moves by the distance A and stops as shown in FIG.

  As described above, when the circular pipe 41 attached to the bracket 39 that supports the support column 40 of the tail wheel 47 is rotatably provided in the tool bar 19 and the rotary tiller 1B is raised, the tail wheel 47 is Since it moved to the front, the full length of the tractor 2 including the rotary tiller 1B at the time of turning can be shortened compared with the case where the tail wheel 47 is fixed. Thereby, since the turning radius of the tractor 2 also becomes small, the uncultivated land of a headland can be narrowed.

DESCRIPTION OF SYMBOLS 1 Rotary tilling device 21 Rotary cover 22 Tillage nail 23 Tillage nail (eccentric nail)
23a Base (base part)
23d Tillage claw part 23g Offset part 25 Side plate 26 Top plate 30 Tillage claw shaft 31 Tillage claw (eccentric claw)
31a Base 31b Tillage claw part 31c Offset part

Claims (4)

A rotary cover comprising a tilling claw for cultivating a farm scene, a tilling claw shaft to which a plurality of the tilling claws are attached, a top plate that covers the top of the tilling claw, and a side plate that covers the side of the tilling claw; In the rotary tiller with
Among the tilling claws, a tilling nail attached to an end of the tilling nail shaft includes a base portion attached to the tilling nail shaft, an offset portion for shifting the tilling nail toward the side plate, and the tilling from the offset portion. A tilling claw portion extending curvedly toward the rotation direction of the nail,
The interval between the tilling claw portion and the side plate is relatively configured to gradually increase toward the downstream direction of the rotation direction of the tilling claw,
A rotary tiller characterized by that. The tilling claw attached to the end of the tilling claw shaft has the tilling claw portion inclined toward the center of the tilling claw shaft,
The rotary tiller according to claim 1. The tilling claw attached to the end of the tilling nail shaft is attached to the tilling nail shaft so that the base of the tilling nail is inclined with respect to the rotation direction. Inclined to the center,
The rotary tiller according to claim 1. The side plate is disposed to be inclined with respect to the rotation direction of the tilling nail,
The rotary tiller according to claim 1.

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