JP3207476U - Rotary cover device - Google Patents

Abstract

To provide a compact rotary cover device in which dirt does not easily adhere to the inner surface of a cover. An attaching part 5 for fixing to a rotary mission case 34 of a tiller, a side cover 2 arranged on the attaching part 5, and a slide arranged so as to overlap the side cover 2 from below. The cover 3 and the outer cover 4 attached to the outer end portion of the slide cover 3 are provided. The side cover 2 and the slide cover 3 are semi-cylindrical in which the cylindrical radius R is 27 mm larger than the rotational radius r of the tip end portion of the tilling claw 32. The slide fixing part 6 is provided in the front and rear positions between the side cover 2 and the slide cover 3 so that the slide cover 3 can be moved in and out, and the slide fixing part 6 is provided in the left-right direction provided on the slide cover 3. A wing nut 8 is screwed onto a projecting / adjusting bolt inserted into a bolt fixing hole 13 provided in the side cover 3 from an elongated slide long hole 10 and the slide long hole 10 of the slide cover 3 is screwed. The circumference is formed on the flat surface 11. [Selection] Figure 2

Description

  The present invention relates to a rotary cover device that covers a rotary portion of a cultivator and has a left and right slide type cover extending and retracting function.

  Usually, the tiller is provided with a cover to prevent the soil scraped up by the rotation of the rotary from being scattered around, but the left and right side covers fixed to the fuselage side to change the soil diffusion range. The slide cover is placed on top of each other, a long slide long hole is formed on the cover surface, and a bolt is inserted into the slide long hole. A rotary cover device that can be fixed at a position is used.

The rotary cover device is formed so that the slide cover can be smoothly moved in and out and the plate surface at the upper center of the cover is formed on a flat surface, and two pieces can be formed on the flat surface. The slide long hole is formed apart from the front and rear.
For this reason, for example, as shown in the following Patent Document 1 and the side view of Patent Document 1, in the side view, the front and back of the flat surface of the cover are bent obliquely downward so as to surround the rotary, As shown in FIG.
When the rotary cover has the trapezoidal shape as described above, as shown in FIG. 8, the soil reservoirs A and B to which soil easily adheres are formed inside the front and rear bent portions of the flat surface, and the soil reservoir A, When soil swept up by rotary enters B, the soil is continuously pressed and hardened by the centrifugal force and wind pressure caused by the rotation of the tilling claws, and grows thicker and firmly adheres to the inner surface of the cover. It is not easy to peel off or wash the soil later.
Further, since the bent portion swells upward and becomes bulky, it is difficult to make the entire rotary cover compact.

JP 2004-89084 A JP 2001-8501 A

  Therefore, the present invention enables the slide cover to smoothly move in and out and be securely fixed in the rotary cover provided with the slide cover that can be protruded from the left and right sides, and the soil is hardly attached to the inner surface of the cover. An object of the present invention is to provide a rotary cover device that can be made compact as a whole.

  In order to achieve the above object, a rotary cover device of the present invention includes an attachment part for fixing to a rotary transmission case of a tillage machine, a side cover disposed on the left and right of the attachment part, and the side cover. The left and right slide covers arranged so as to overlap from the lower side, and the left and right outer covers arranged on the outer end of the slide cover, the side cover and the slide cover being centered on the rotary axis of the rotary It is formed in an upper semi-cylindrical shape with a cylindrical radius 15 to 35 mm larger than the rotation radius of the tip of the tilling nail, and slides to the front intermediate portion and the rear intermediate portion of the left and right side covers and the left and right slide covers. Provided with a slide fixing portion that allows the cover to protrude from the outer end of the side cover to the outside and to be fixed at the protruding position. A long elongated slide hole is provided in the direction, and a bolt fixing hole is provided in a portion corresponding to the long slide hole in the side cover, and a flat surface is formed around the long slide hole of the slide cover. The present invention is characterized in that a wing nut is screwed onto an in / out adjusting bolt inserted through the fixing hole.

  According to a second aspect of the present invention, there is provided a device according to the above-mentioned device, wherein the slide long hole has a length and a width that are hidden between the inner surface of the slide cover and the bolt head of the in / out adjusting bolt and is closer to the end on the attachment portion side. A long hole shielding plate having a bolt restraint hole is sandwiched between the bolt restraint holes, and an adjustment bolt is inserted into the bolt restraint hole, and the long hole shield plate is disposed on the inner surface of the slide cover. A guide step that is slidable only in a direction is formed, and a range in which the long hole shielding plate on the inner surface of the slide cover can contact is formed on a flat surface.

  The device according to claim 3 is characterized in that, in the above device, the bolt fixing hole of the side cover is formed elongated in the length direction of the slide long hole of the slide cover.

  The invention according to claim 4 is an angle in which, in the above-mentioned invention, the side cover can be attached to the attachment portion through a hinge so that the side cover can be slid up and down, and the side cover can be fixed at an arbitrary angle. An adjustment fixing part is provided.

The rotary cover device of the present invention has a semi-cylindrical side cover and slide fixing portions provided at two positions on the front and rear sides of the slide cover, so that the slide cover on the lower side of the side cover can be protruded from the left and right sides. Since the periphery of the slide long hole is formed on a flat surface, the slide cover does not swing back and forth with respect to the side cover, and a smooth and stable slide and reliable fixing can be achieved.
In addition, the side cover and slide cover are semi-cylindrical with the rotary shaft as the center, so that compared to the conventional trapezoidal rotary cover, there is no soil accumulation space on the inner surface of the cover, so there is almost no dirt on the inner surface of the cover. Since it does not adhere and there is no earth accumulation space, a significant reduction in size is possible.
At this time, the cylindrical radius of the slide cover is set to a value obtained by adding 15 to 30 mm to the rotational radius of the tip of the rotary tiller, so that the gap between the inner surface of the slide cover and the tip of the tiller Even if the scattered soil adheres to the inner surface of the cover once, it is scraped cleanly by the wind pressure at the tip of the rotating tillage nail and the rubbing of the soil in the rotating direction, so it is possible to prevent the soil from sticking to the inner surface of the cover . At that time, the gap between the inner surface of the slide cover and the tip of the tilling claw is 15 mm or more. Smooth plowing with the rotary is possible without receiving it.
Then, by bringing the slide cover closer to 15 mm from the tip of the rotary tillage claw, the entire rotary cover can be made smaller and more compact.

According to the second aspect of the present invention, the long hole shielding plate can be reliably moved only in the longitudinal direction of the slide long hole without being moved in the front-rear direction by the restriction of the guide step provided on the slide cover.
At this time, the slide long hole provided in the slide cover is covered with the long hole shielding plate from the bottom, so that the dust scraped up by the tilling claw is prevented from leaking upward from the slide long hole.
In addition, the long hole shielding plate that can move along the slide long hole is formed on the side cover by a flat surface formed in a range in which the long hole shielding plate around the slide long hole formed in the slide cover can contact. On the other hand, the slide cover can be smoothly and stably slid without swinging back and forth.

According to the third aspect of the present invention, the side cover can be largely slidable by the length of the bolts for adjusting the protrusions and recesses, with the bolt fixing holes of the side cover formed long.
That is, the side cover can be slid not only by the length of the slide long hole, but also can be protruded to the outside by the length of the bolt fixing hole of the side cover in addition to the length of the slide long hole. As a result, it is possible to spread more soil to the side by spreading the space outside the rotary greatly to the left and right.

  In the invention according to claim 4, the side cover that can be moved up and down via the hinge can be fixed by tilting the outside of the slide cover with the angle adjusting portion. By spreading the space upward, the soil that has been scraped up can be spread more widely to the side.

It is a side view which shows the use condition of this invention. It is a vertical side view of the present invention. It is a perspective view which shows the state which the slide cover was sunk under the side cover. It is a perspective view which shows the state which the slide cover protruded from the side cover. It is a perspective view which shows the state which raised and inclined the outer side of the slide cover. It is the vertical perspective view of the principal part which looked at the slide fixing | fixed part from the bottom of the slide cover. (A) shows the state where the slide cover is submerged under the side cover, (B) shows the state where the slide cover protrudes from the side cover, and (C) shows the state where the slide cover protrudes maximum from the side cover. It is each perspective view of the principal part which looked at the slide fixing | fixed part from the bottom of the slide cover. It is a typical vertical side view of the conventional rotary cover apparatus.

An embodiment of a rotary cover device of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a walking type tiller in which the present invention is used is provided with a handle 37 projecting obliquely rearward and rearwardly on the upper part of the machine body 30, a drive wheel 35 provided at a lower center part, and a rear lower part. A rotary shaft 33 that includes the rotary 31 and rotates the tillage claw 32 of the rotary 31 is connected to the engine via the mission, and the farmland can be cultivated by rotating the tillage claw 32 with power to the engine.
Reference numeral 36 in FIG. 1 denotes a tillage depth adjusting unit 36 provided with a depth adjusting plate 36a. By raising and lowering the depth adjusting plate 36a, the height of the tilling claws 32 with respect to the farmland is adjusted. The depth to do is decided.
The mission is stored in the mission case 34.

The rotary cover device of the present invention is attached to the mission case 34 or the machine body 30 so as to cover the rotary 31 so that the soil scraped up by the rotation of the tillage claws 32 of the tiller is not scattered around.
When the rotary cover device is mounted on the body 30, it is possible to mount the rotary cover device by providing a cover support (not shown) that reaches from the body 30 to above the rotary 31.

  When the rotary cover device is mounted on the mission case 34, as shown in FIG. 2, a fixed base support 28 is provided on the rotary shaft 33 side of the rotary 31 of the mission case 34, and the fixed base support 28 is provided. A rectangular fixing base 29 is horizontally installed on the upper surface of the. Then, as shown in FIG. 3, a flat plate-like attachment portion 5 having a fixing bolt hole 5a communicating with a bolt hole provided on the upper surface of the fixing base 29 is overlaid on the fixing base 29, and A fixing bolt (not shown) is screwed into the fixing bolt hole 5 a and the rotary cover device is attached to the mission case 34.

  As shown in FIG. 3, the rotary cover device includes an attachment portion 5 for attachment to the mission case 34 and the left and right sides of the attachment portion 5 so as to cover the upper sides of the tilling claws 32 on the left and right sides of the rotary 31. The left and right side covers 2 and 2 are provided in a protruding state on both sides, and are arranged so as to overlap the lower sides of the side covers 2 and 2, respectively, and outward from the outer ends 2 a of the side covers 2 and 2, respectively. Left and right slide covers 3, 3 that can be moved in and out, and left and right outer covers 4, 4 attached to the outer sides of the slide covers 3, 3 so as to cover both outer sides of the tilling claws 32 of the rotary 31. .

FIG. 3 shows a mode in which the central cover 1 is provided so as to cover the transmission case 34 of the rotary 31 before and after the attachment portion 5. In this mode, the fixed case provided on the transmission case 34 of the rotary 31 is shown. The side covers 2 and 2 are fixed to the attachment portion 5 provided on the center cover 1 with respect to the base 29.
The central cover 1 covers the transmission case 34 of the portion including the rotary shaft 33 of the tiller claw 32 with the front and rear cover surfaces of the attachment portion 5, and the front cover surface is shown in FIG. As described above, an opening 24 notched in a U-shape is provided in a portion where the mission case 34 abuts so that the mission case 34 can be mounted at an optimal position.

The outer cover 4 may be welded and fixed to the outer end portion 3a of the slide cover 3, but is attached to the outer side of the slide cover 3 through a hinge (not shown). ) Is also possible.
Reference numerals 26a, 26b, and 26c in FIG. 4 are flexible mud avoidance sheets made of rubber or the like, and mud avoidance is provided by providing steps on the lower sides of the rear portions of the side cover 2, slide cover 3, and center cover 1, respectively. A sheet adhering portion 25 is formed, and the upper portions of the respective mud avoidance sheets 26a, 26b, and 26c are adhering with hooks 27 and suspended.

In the present invention, as shown in FIG. 2, the center cover 1, the left and right side covers 2, and the left and right slide covers 3 are all formed in an upper semi-cylindrical shape centering on the rotation shaft 33 of the rotary 31. The left and right outer covers 4 are formed in an upper semicircular shape that fits inside the semicylindrical shape of the slide cover 3.
These circular shapes do not need to be exactly semicircular. For example, as shown in FIG. 2, they may be slightly inferior in arc shape, or may have irregularities such as stepped surfaces and flat surfaces in part. .

The cylindrical diameter of the slide cover 3 is set to fall within a cylindrical radius R obtained by adding 15 to 30 mm to the rotational radius r of the rotational locus K of the tip 32a of the tilling claw 32 of the rotary 31.
For example, when the rotation radius r of the rotation locus K is 175 mm, the cylinder radius R of the slide cover 3 becomes 202 mm if 27 mm is added.

  However, if the numerical value added to the rotation radius r of the rotation path K of the tip 32a of the tillage claw 32 of the rotary 31 is less than 15 mm, the gap between the tip 32a of the tillage claw 32 and the inner peripheral surface of the slide cover 3 is not. This is not preferable because a pebble or a lump of soil may be caught between the two and the tilling claw 32 may be damaged. Further, if the numerical value is more than 35 mm, the effect of scraping off the soil due to the rotation of the tillage claws 32 is reduced, and there is a possibility that the soil will adhere to the inner surface of the cover.

In addition, as shown in FIG. 8, in the conventional rotary cover device J, the side cover a and the slide cover b form a trapezoidal upper portion, so that the earth accumulations A and B are formed at the front and rear corner portions. The
Since the soil pools A and B are separated from the tip of the tilling nail, the scratching force of the soil repelled by the rotation of the tilling nail is weak. As a result of being compressed by the wind and centrifugal force of the nail, the soil is hard and hard to drop.
In addition, the rotary cover J is greatly bulky upward due to the bulge on the corner portion, which is an obstacle to downsizing.
On the other hand, in the present invention, a semi-cylindrical shape having a cylindrical radius R in a range close to the minimum approach limit obtained by adding 15 to 30 mm to the rotation radius r of the tip 32a of the tilling nail 32 is completely free of dirt. It is not formed, and the whole can be made compact.

  In the cylindrical radius R of the slide cover 3, the space between the inner surface of the slide cover 3 and the tip end portion 32a of the tillage claw 32 is narrow, so that the rotation of the tip portion 32a of the rotating tillage claw 32 is flipped in the rotation direction. The soil once adhered to the surface is scraped off by rubbing the soil lump and gravel particles, and the soil adhesion is prevented. At that time, the inner surface of the slide cover 3 and the tip end portion 32a of the tillage claw 32 are Since there is an interval of 15 mm or more, damage from the gravel or soil mass sandwiched between the tips 32a of the tilling claws can be avoided, so that the farmland can be smoothly cultivated.

  In the present invention, the left and right side covers 2 and 2 and the left and right slide covers 3 and 3 are provided on the lower side (inside) of the side covers 2 and 2 as shown in FIG. A slide fixing portion 6 is provided that allows the plate surfaces to overlap each other and protrudes to the left and right sides and can be fixed at an arbitrary protruding position.

As shown in FIGS. 3 and 4, the slide fixing portion 6 has bolt fixing holes 13 at the front intermediate portion and the rear intermediate portion of the plate surfaces near the outer end portions 2a of the left and right side covers 2, 2, respectively. The left and right slide covers 3, 3 provided so that the plate surfaces overlap the inner sides of the left and right side covers 2, 2 are arranged in the left-right direction at positions where they communicate with the bolt fixing holes 13 of the side cover 2. A long slide long hole 10 is formed.
Further, as shown in FIG. 7, the lower side (inner side) of the slide cover 3 has a length and a width so that the slide long hole 10 is concealed, and a bolt restraining hole 9a is provided near the attachment portion 5. A long hole shielding plate 9 is provided.
The long hole shielding plate 9 prevents the dust scraped up by the tilling claws 32 from leaking upward from the slide long hole 10.

Then, as shown in FIG. 6, the adjustment bolt 7 having a bolt head 7 a on the bolt shaft 7 a is connected to the bolt restraining hole 9 a of the long hole shielding plate 9 from the inside of the long hole shielding plate 9 and the slide cover 3. The wing nut 8 is screwed into the bolt shaft 7 a protruding above the side cover 2 through the washer 14 in order through the slide long hole 10 and the bolt fixing hole 13 of the side cover 2.
As a result, by loosening the wing nut 8 screwed to the bolt shaft 7a, the slide cover 3 can slide out from the side cover 2, and by tightening the wing nut 8, the slide covers 3, 3 can be protruded arbitrarily. It becomes possible to fix to the side cover 2 at a position.
Then, as shown in FIG. 4, the slide cover 3 is slid outward (showing a state in which the left side is greatly widened in FIG. 4) to widen the space below the side cover 2 and the slide cover 3. It becomes possible to diffuse a large amount of soil scraped up outside the tillage claws 32 of the rotary 31.
If the bolt fixing hole 13 is provided not near the outer end portion of the side covers 2 and 2 but at the opposite inner end portion portion, the retracting adjustment bolt 7 can be sufficiently reciprocated to the slide long hole 10. It is not preferable because it cannot be done.
Further, when the flange adjusting bolt 7 is a flange bolt, it is possible to more stably press the slide long hole 10 with a wide flange surface.

Further, as shown in FIGS. 6 and 7, the long hole shielding plate 9 pressed from below by the bolt head 7b is slidable only in the longitudinal direction of the slide long hole 10 on the inner surface of the slide cover 3. A guide level difference 12 that is restrained and slidable in the left-right direction is formed.
And the inside of the guide level | step difference 12 in which the said long hole shielding board 9 slides and can contact the periphery of the slide long hole 10 of the said slide cover 3 is formed in the flat surface 11. FIG.

Usually, when the curved slide cover 3 is slid with respect to the curved side cover 2 between the curved surfaces, vibration tends to occur in the vertical direction and the front-rear direction, and it is difficult to stably slide. Particularly, in the case of slight back-and-forth movement, the curved surface of the slide cover 3 comes into contact with the curved surface of the side cover 2 when a slight touch occurs. It may become unable to slide as it is locked up.
On the other hand, in the present invention, the slide fixing portions 6 are provided at two positions before and after the front intermediate portion and the rear intermediate portion, and the long hole shielding plate 9 is provided only in the longitudinal direction of the slide long hole 10. Since the slidable guide step 12 is provided, the slide cover can be prevented from swinging back and forth, and can smoothly slide in and out of the side cover 2.

Further, the bolt fixing hole 13 of the side cover 3 can be formed to be elongated and formed to have substantially the same diameter as the in / out adjusting bolt 7.
The bolt fixing hole 13 shown in FIG. 4 shows a form that is elongated in the same direction as the length direction of the slide long hole 10 of the slide cover 3.
In this embodiment, as shown in FIG. 7, since the bolt fixing hole 13 is long, the side cover 2 can slide with respect to the protrusion adjustment bolt 7 by an extra length.
That is, as shown in FIG. 7C, the slide width corresponding to the length of the bolt fixing hole 13 and the slide width corresponding to the length of the slide long hole 10 are added together, so that the slide cover 3 is located outside. Makes it possible to project significantly.

  7 is a perspective view showing a part of the side cover 2 and the slide cover 3 when the slide fixing portion 6 having the long bolt fixing holes 13 is viewed from the bottom of the slide cover 3, and FIG. Indicates a state in which the slide cover 3 is submerged under the side cover 2, (B) is a state in which the in / out adjusting bolt 7 is not sliding in the bolt fixing hole 13, and the outer end portion 3 a of the slide cover 3 is the side cover. 2 shows a state in which it protrudes from the outer end portion 2a of the outer cover 2 in a maximum, and (c) further shows that the adjustment bolt 7 slides on the bolt fixing hole 13 so that the outer end portion 3a of the slide cover 3 extends from the outer end portion 2a of the side cover 2. The state that protrudes to the maximum is shown.

If the slide long hole 10 is formed long over the entire length of the slide cover 3 so that the slide cover 3 can be projected and retracted, the long hole shielding plate 9 must also be formed long according to the length, There is a case where the outer portion of the long hole shielding plate 9 for shielding the slide long hole 10 protrudes outward from the outer end portion 3a of the slide cover 3 by sliding movement.
On the other hand, the length range of the bolt fixing hole 13 of the side cover 2 is formed in a half space near the outer end 2a of the side cover 2, and the length range of the slide long hole 10 of the slide cover 3 is defined as the slide cover. 3, the slide long hole 10 of the slide cover 3 can be formed shorter by the length of the bolt fixing hole 13.
As a result, as shown in FIG. 7, the long hole shielding plate 9 for shielding the slide long hole 10 can be shortened, and the entire long hole shielding plate 9 can be accommodated in the space of the slide cover 3. .

Further, in the present invention, as shown in FIG. 3, the side covers 2 and 2 can be attached to the attachment portion 5 via hinges 16 and 16 so as to be slidable up and down, and can be fixed at any angle up and down. The form which provides the angle adjustment fixing | fixed part 15 is possible.
For example, as shown in FIG. 5, left and right side covers 2 are connected to the central cover 1 via hinges 16, 16 on the left and right sides so as to be vertically movable, and the side cover 2 is fixed at an arbitrary angle α. An angle adjustment fixing portion 15 that can be provided is provided.
The angle adjusting and fixing portion 15 has both upper and lower bridges bridged by a rod support column 17 standing at the center of the central cover 1 and rod connecting hooks 20 and 20 fixed on the left and right side covers 2 and 2, respectively. The swing angle of the left and right side covers 2 and 2 can be restricted by an arbitrary angle α by adjusting the cross-linking interval between the angle adjusting rods 21 and 21.

In this embodiment, a hook insertion hole 22 into which the rod connecting hook 20 is inserted is provided on one end side of the vertical angle adjusting rod 21, and the bridging interval can be adjusted by inserting an adjustment fixing screw 19 on the other end side. An angle adjusting step hole 23 is provided.
The angle adjusting step hole 23 forms a long gap having a width equal to or larger than the thickness of the adjusting fixing screw 19 in the length direction of the vertical angle adjusting rod 21, and stepwise in the middle of the long gap. A plurality of retaining grooves 23a having a width into which a continuous corrugated adjustment fixing screw 19 can be inserted are formed.
The rod support 17 is provided with a screw insertion hole 18 into which an adjustment fixing screw 19 can be inserted.

Then, the adjustment fixing screw 19 inserted into the screw insertion hole 18 of the rod support column 17 is engaged with the angle adjustment step hole 23 of the left and right vertical adjustment rods 21 to connect the rod on the side cover 2. A hook insertion hole 22 of the vertical angle adjusting rod 21 is inserted into the hook 20.
As a result, the side cover 2 that can be moved up and down via the hinges 16 on the left and right of the central cover 1 has a vertical angle adjusting rod in which the adjusting fixing screw 19 is fixedly held in an arbitrary engaging groove 23a. 21 is fixed at an arbitrary angle α in a stepwise manner.
In FIG. 4, the angle adjusting step hole 23 is shown with four corrugated retaining grooves 23 a so that the angle adjusting step hole 23 can be securely fixed at four positions. However, the angle adjusting step hole 23 is free without the retaining groove 23 a. It may be a simple long hole that can be fixed at any position.
Then, by raising the outer sides of the side covers 2 and 2 so as to be greatly inclined, the space above the rotary 31 is greatly expanded, and the soil that has been scraped up can be diffused widely around.

  The rotary cover device of the present invention has been described with respect to the type of cultivator having a rotary on the rear side of the drive wheel. However, the rotary cover device can also be used for a type of cultivator having a rotary on the front side of the drive wheel.

DESCRIPTION OF SYMBOLS 1 Center cover 2 Side cover 3 Slide cover 4 Outer cover 5 Attachment part 5a Fixing bolt hole 6 Slide fixing part 7 Protrusion adjustment bolt 7a Bolt shaft 7b Bolt head 8 Wing nut 9 Long hole shielding plate 9a Bolt restraint hole 10 Slide long hole DESCRIPTION OF SYMBOLS 11 Flat surface 12 Guide level | step difference 13 Bolt fixing hole 15 Angle adjustment fixing | fixed part 16 Hinge 17 Rod support | pillar 18 Screw insertion hole 19 Adjustment fixing screw 20 Rod connection hook 21 Angle adjustment rod 22 Hook insertion hole 23 Angle adjustment step hole 23a Latch groove 29 Fixing base 30 Machine body 31 Rotary 32 Claw claw 32a Claw tip 33 Rotary shaft 34 Transmission case R Slide cover cylindrical radius r Claw tip rotation radius K Claw tip Rotation trajectory

Claims (4)

An attaching portion for fixing to the rotary transmission case of the tiller, a side cover disposed on the left and right of the attaching portion, and a left and right slide cover disposed so as to overlap the side cover from below; Left and right outer covers disposed on the outer end of the slide cover,
The side cover and the slide cover are formed in an upper semi-cylindrical shape having a cylindrical radius that is 15 to 35 mm larger than the rotational radius of the tip of the tilling claw around the rotary axis of the rotary,
The slide cover can be protruded outward from the outer end portion of the side cover and fixed at the extended position at the substantially intermediate portion on the front side and the substantially intermediate portion on the rear side of the left and right side covers. Provide a slide fixing part,
The slide fixing portion is provided with a long and slender slide hole in the left and right direction in the slide cover and a bolt fixing hole in a portion corresponding to the slide long hole in the side cover, and the periphery of the slide long hole of the slide cover is flat. A rotary cover device characterized in that a wing nut is screwed to an in / out adjusting bolt formed on a surface and inserted through the slide long hole into a bolt fixing hole.   Between the inner surface of the slide cover and the bolt head of the in / out adjustment bolt, a long hole shielding plate having a length and width that hide the slide long hole and having a bolt restraint hole near the end on the attachment side is sandwiched. In the bolt restraint hole, an adjustment bolt is inserted and arranged, and a guide step is formed on the inner surface of the slide cover to restrain the long hole shielding plate so as to be slidable only in the longitudinal direction of the slide long hole. The rotary cover device according to claim 1, wherein a range in which the long hole shielding plate on the inner surface of the slide cover can come into contact is formed on a flat surface.   The rotary cover device according to claim 1 or 2, wherein the bolt fixing hole of the side cover is formed to be elongated in the length direction of the slide long hole of the slide cover. 2. The mounting portion includes an angle adjustment fixing portion that allows the side cover to be vertically slidable through a hinge and that allows the side cover to be fixed at an arbitrary angle. The rotary cover device according to claim 3.

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