JP2023013913A - Hook bolt polishing device - Google Patents

Abstract

To provide a hook bolt polishing device which can polish a hook bolt in a more proper manner and inhibit scattering of powder dust occurring during polishing.SOLUTION: A polishing device 10 includes a cylindrical rotating body 11 and a cover. The cylindrical rotating body 11 is formed in a cylindrical shape centered on a predetermined axis and a brush is provided on its inner surface. The cover is disposed so as to enclose a periphery of the cylindrical rotating body. The cover is provided with a dust collecting port with which a dust collector for suctioning powder dust occurring in the cover may be connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hook bolt grinding apparatus.

Conventionally, there is slate as a roofing material containing asbestos. Since slate is much lighter and cheaper than clay tiles, it is often used as exterior materials and roofing materials. However, it has been pointed out that if a person stays in an environment where asbestos dust is generated for a long time and inhales a large amount of asbestos, the incidence of lung cancer may increase. Therefore, very strict regulations are imposed on demolition work and renovation work of buildings using roofing materials containing asbestos. As a device capable of removing such asbestos-containing slate, there is a removal device described in Patent Document 1 below.

The removal device described in Patent Literature 1 includes a dust vacuum cleaner and a hood. The dust vacuum cleaner sucks dust generated when the roof material is removed through a filter. The hood is attached to the tip of a suction hose extending from the dust vacuum cleaner and is in contact with the surface of the roof material.

Japanese Unexamined Patent Application Publication No. 2007-205110

By the way, fixing a slate to a roof is generally performed using a fastening material called a hook bolt in many cases. Hook bolts are sometimes called C-shaped steel or C-channel. Since the tip of such hook bolt is exposed from the upper surface of the slate, it is exposed to the elements. If the tip of the hook bolt is exposed to wind and rain for a long period of time, foreign matter may adhere to the tip of the hook bolt, or rust may occur. This is a factor that deteriorates the hook bolt. If the hook bolts are detached from the slate due to deterioration of the hook bolts, the slate may be detached from the roof, which is not preferable.

Therefore, the inventors have studied suppressing deterioration of the hook bolt by applying a reinforcing agent or a rust preventive agent to the hook bolt. When suppressing deterioration of hook bolts by such a method, it is necessary to remove foreign matter accumulated on the tip of the hook bolt in order to properly apply reinforcing material and rust inhibitor to the tip of the hook bolt. There is In this regard, the removal device described in Patent Document 1 can suck dust generated when the roofing material is removed, but it is difficult to remove foreign matter and the like accumulated on the tip of the hook bolt. Therefore, there is a demand for a device capable of removing foreign matter and the like deposited on the tip portion of the hook bolt. Also, when the tip of the hook bolt is actually ground, the slate arranged around the hook bolt may be slightly ground. Since the dust generated at this time contains asbestos, it is necessary to take measures to prevent its scattering.

SUMMARY OF THE INVENTION The present invention has been made in view of these circumstances, and an object of the present invention is to provide a hook bolt capable of more accurately grinding a hook bolt and suppressing the scattering of dust generated during grinding. To provide a bolt polishing device.

A polishing apparatus for solving the above problem is a polishing apparatus for polishing hook bolts, and includes a cylindrical rotor and a cover. The cylindrical rotating body is formed in a cylindrical shape centering on a predetermined axis, and is provided with a brush on its inner surface. The cover is arranged to surround the cylindrical rotating body. The cover is provided with a dust suction port to which a dust suction device for sucking dust generated inside the cover can be connected.

According to this configuration, when the tip of the hook bolt is inserted into the cylindrical rotating body and then the cylindrical rotating body is rotated, the tip of the hook bolt is polished by the brush provided inside the cylindrical rotating body. . Therefore, it is possible to remove the foreign matter and the like adhering to the tip portion of the hook bolt. Also, when polishing the tip of the hook bolt, even if dust is generated by scraping the slate around the hook bolt, the cover suppresses the scattering of the dust and also removes the dust inside the cover. , can also be sucked by a dust collector through a dust suction port. As described above, according to the above configuration, it is possible to grind the hook bolt more accurately and to suppress scattering of dust generated during grinding.

In the above-described hook bolt grinding apparatus, the cylindrical rotating body includes an external cylindrical member that rotates around an axis when power is transmitted from the drive unit, and is detachably provided inside the external cylindrical member. and an internal member in which the brush is provided.
According to this configuration, by removing the inner member from the outer cylindrical member, it is possible to easily remove foreign substances and the like adhering to the brush of the inner member, thus facilitating maintenance of the polishing apparatus.

In the above-described hook bolt grinding apparatus, it is preferable that the inner cylindrical member is formed in a cylindrical shape and has the brush provided on the inner surface thereof.
According to this configuration, it is possible to easily realize an internal member having a brush on the inner surface.

In the hook bolt grinding apparatus, the inner cylindrical member is assembled to the outer cylindrical member by a screw structure, and the inner cylindrical member is screwed into the outer cylindrical member in a direction opposite to the rotating direction of the cylindrical rotor. It is preferably assembled to the outer cylindrical member.
According to this configuration, it is possible to avoid loosening of the screw structures of the outer cylindrical member and the inner cylindrical member when the cylindrical rotating body rotates, so that the inner cylindrical member is less likely to come off from the outer cylindrical member.

In the above-described hook bolt grinding apparatus, the internal member is preferably an internal spiral member formed spirally around an axis and having a brush on the inner surface thereof.
According to this configuration, it is possible to easily realize an internal member having a brush on the inner surface.

In the hook bolt grinding apparatus described above, it is preferable that at least one of the cylindrical rotating body and the internal spiral member is provided with a suppressing member that suppresses relative rotation about the axis of the internal spiral member with respect to the cylindrical rotating body. .
According to this configuration, when the outer cylindrical member rotates, the inner spiral member rotates together with the outer cylindrical member, so that the hook bolt can be ground more accurately.

In the above-described hook bolt grinding apparatus, it is preferable that the inner surface of the cylindrical rotating body is formed with a projection as a restraining member that contacts the internal spiral member in the direction of rotation about the axis.
According to this configuration, it is possible to easily realize a suppressing member that suppresses relative rotation of the internal spiral member with respect to the cylindrical rotating body.

In the hook bolt polishing apparatus, the internal spiral member includes a brush and a fixing member that holds and fixes one end of the brush, and the fixing member is spirally bent so that the brush is positioned inside. preferably.
According to this configuration, it is possible to easily realize a spiral brush structure.

In the above-described hook bolt grinding apparatus, it is preferable that a through hole penetrating from the inner surface to the outer surface is provided in the cylindrical rotating body.
According to this configuration, foreign matters and the like generated by grinding the hook bolts are discharged from the inside of the cylindrical rotating body to the outside through the through holes, so that foreign matters and the like are less likely to accumulate on the brush. As a result, it is possible to maintain the foreign matter removing performance of the polishing apparatus for a longer period of time.

In the above-described hook bolt polishing apparatus, the cylindrical rotating body is formed in a bottomed cylindrical shape, and the cylindrical rotating body has a through hole that penetrates the cylindrically formed portion from the inner surface to the outer surface. It is preferable that a first through-hole and a second through-hole penetrate from the inner surface to the outer surface of a bottom wall provided so as to close one end of the portion formed in a cylindrical shape.

According to this configuration, foreign substances and the like generated by polishing the hook bolts with the brush are more easily discharged from the inside of the cylindrical rotating body to the outside through the first through holes and the second through holes.

According to the hook bolt grinding apparatus of the present invention, it is possible to grind the hook bolt more accurately and to suppress scattering of dust generated during grinding.

1 is a perspective view schematically showing the perspective structure of a polishing apparatus according to a first embodiment; FIG. Sectional drawing which shows the cross-sectional structure of a slate. The perspective view which shows the perspective structure of a slate. An end view showing the end face structure of the cylindrical rotating body of the first embodiment. The perspective view which shows the perspective structure of the internal cylindrical member of 1st Embodiment. 1 is a perspective view showing a usage example of the polishing apparatus of the first embodiment; FIG. An end view showing the end face structure of the cylindrical rotating body of the second embodiment. The perspective view which shows the perspective structure of the cylindrical rotary body of 2nd Embodiment. Sectional drawing which shows the cross-section of the cylindrical rotor of 3rd Embodiment. The front view which shows the front structure of the internal spiral member of 3rd Embodiment. The front view which shows the front structure of the base member of 3rd Embodiment. Sectional drawing which shows the cross-sectional structure of the base member of 3rd Embodiment. The top view which shows the planar structure of the holding member of 3rd Embodiment.

An embodiment of a hook bolt grinding apparatus will be described below with reference to the drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.
<First embodiment>
A polishing apparatus 10 of the present embodiment shown in FIG. 1 is an apparatus for polishing hook bolts for fixing a slate to the roof of a building. First, the structure of the roof of the building will be briefly explained.

As shown in FIG. 2, a slate 1 that constitutes the roofing material is placed on a beam 2 . The beam 2 is H-shaped steel or the like. The slate 1 is formed to have a wavy cross-sectional shape perpendicular to the slope direction Y of the roof, and has peaks 1a and valleys 1b alternately in the horizontal direction X. As shown in FIG. A plurality of slates 1 are arranged so that their ends overlap each other in the horizontal direction X. As shown in FIG. A plurality of slates 1 are fixed to beams 2 by hook bolts 3 attached to peaks 1a.

A male threaded portion 3a is formed at the upper end portion of the hook bolt 3. As shown in FIG. A hook portion 3 b bent at an acute angle is formed at the lower end portion of the hook bolt 3 . The hook portion 3b is engaged with the beam 2. As shown in FIG. The slate 1 is fixed to the beam 2 via the hook bolt 3 by screwing the nut 4 onto the male threaded portion 3a. A washer 5 is sandwiched between the slate 1 and the nut 4. - 特許庁

In such a building in which slate is used as the roof material, the tip 3c of the hook bolt 3 is exposed to the outside as shown in FIG. If the tip 3c of the hook bolt 3 is exposed to wind and rain for a long period of time, foreign matter may adhere to the tip 3c of the hook bolt 3, or rust may occur. A polishing apparatus 10 shown in FIG. 1 is a device for removing foreign matters and the like adhering to the tip portion 3c of the hook bolt 3 by polishing the tip portion 3c of the hook bolt 3. As shown in FIG.

As shown in FIG. 1, the polishing apparatus 10 includes a cylindrical rotating body 11, a drive section 12, and a grip section 13. As shown in FIG.
The drive unit 12 is configured by an electric motor or the like. The cylindrical rotating body 11 is integrally attached to the tip of the output shaft 120 of the drive section 12 . The drive unit 12 rotates the output shaft 120 in the direction indicated by the arrow Da based on the supply of electric power. By transmitting the power of the drive unit 12 to the cylindrical rotating body 11, the cylindrical rotating body 11 also rotates about the axis m10 in the direction indicated by the arrow Da.

Grip portion 13 is formed to extend outward from the side surface of drive portion 12 . The grip portion 13 is a portion that a user grips by hand when using the polishing apparatus 10 .
The cylindrical rotating body 11 is a portion that polishes the tip portion 3c of the hook bolt 3 by rotating around the axis m10. As shown in FIG. 4 , the cylindrical rotor 11 has an outer cylindrical member 20 and an inner cylindrical member 30 . The outer cylindrical member 20 and the inner cylindrical member 30 are made of metal material such as aluminum.

The outer cylindrical member 20 is formed in a bottomed cylindrical shape centering on the axis m10. The external cylindrical member 20 has a cylindrical portion 21 formed in a cylindrical shape around the axis m10 and a bottom wall portion 22 provided to close one opening of the cylindrical portion 21 . An output shaft 120 of the driving portion 12 is integrally connected to the outer surface of the bottom wall portion 22 . A female screw portion 23 is formed on the inner peripheral surface of the cylindrical portion 21 .

As shown in FIG. 5, the inner cylindrical member 30 is formed in a cylindrical shape around the axis m10. The inner cylindrical member 30 has an outer diameter approximately the same as the inner diameter of the outer cylindrical member 20 . A male threaded portion 31 is formed on the outer peripheral surface of the internal cylindrical member 30 . A large number of brushes 40 are provided on the inner peripheral surface of the inner cylindrical member 30 . Brush 40 is formed to extend inwardly from the inner peripheral surface of internal cylindrical member 30 toward central axis m10. In this embodiment, the inner cylindrical member 30 corresponds to the inner member.

As shown in FIG. 4, the male threaded portion 31 of the inner cylindrical member 30 is screwed into the female threaded portion 23 of the outer cylindrical member 20 in the direction indicated by the arrow Db, whereby the inner cylindrical member 30 is attached to the outer cylindrical member 20. integrally assembled. The direction indicated by the arrow Db is opposite to the rotational direction Da of the cylindrical rotor 11 . With this structure, when the cylindrical rotating body 11 rotates in the direction indicated by the arrow Da, the threaded structure formed by the female threaded portion 23 of the outer cylindrical member 20 and the male threaded portion 31 of the inner cylindrical member 30 is not loosened. less likely to occur.

On the other hand, the inner cylindrical member 30 can be removed from the outer cylindrical member 20 by rotating the inner cylindrical member 30 relative to the outer cylindrical member 20 in the direction indicated by the arrow Da. Thus, in the polishing apparatus 10 of this embodiment, the inner cylindrical member 30 is detachably attached to the outer cylindrical member 20 .

As shown in FIG. 6 , the polishing apparatus 10 of this embodiment further includes a cover 50 that surrounds the cylindrical rotor 11 . The cover 50 is made of a metal material such as aluminum or steel, an elastic material such as rubber, a resin material, or the like, and is formed in a substantially semi-cylindrical shape. Both side walls 51 and 52 of the cover 50 are formed with recesses 53 corresponding to the shape of the ridges 1a of the slate 1, respectively.

A through hole 54 is formed in the upper surface of the cover 50 . The output shaft 120 of the driving portion 12 shown in FIG. 1 is inserted into the through hole 54 . Inside the cover 50, the cylindrical rotor 11 shown in FIG. 1 is arranged.
As shown in FIG. 6, the cover 50 is further provided with a dust suction port 55 . A hose 61 is attached to the dust suction port 55 . A dust collector 60 can be connected to the hose 61 . The dust vacuum cleaner 60 sucks dust generated inside the cover 50 through a hose 61 at a predetermined air pressure. Dust vacuum cleaner 60 has a multi-layer filter structure capable of collecting asbestos-containing dust contained in the air sucked through hose 61 . A multilayer filter structure is configured by combining a plurality of filters such as a main filter, a micro filter, and a HEPA (High Efficiency Particulate Air) filter. The main filter is a filter capable of collecting relatively large foreign matter and asbestos-containing dust. A microfilter is a filter capable of collecting micron-sized dust that cannot be collected by the main filter. A HEPA filter is a filter that can collect nano-sized dust that cannot be collected by a microfilter.

Next, an operation example of the polishing apparatus 10 will be described.
When polishing the tip portion 3c of the hook bolt 3, first, the operator holds the grip portion 13 by hand and then inserts the tip portion 3c of the hook bolt 3 into the cylindrical rotating body 11. As shown in FIG. At this time, the cover 50 is brought into close contact with the ridges 1a of the slate 1 as shown in FIG. Since recesses 53 are formed in both side walls 51 and 52 of the cover 50, if the cover 50 is arranged so that the recesses 53 are aligned with the tops of the ridges 1a of the slate 1, the ridges 1a of the slate 1 can be removed. The peripheral edge of the lower end of the cover 50 can be brought into close contact.

When the operator drives the driving portion 12 of the grinding device 10 in this state, the tip portion 3c of the hook bolt 3 is ground by the brush 40 by rotating the cylindrical rotating body 11. As shown in FIG. As a result, foreign substances and the like adhering to the tip portion 3c of the hook bolt 3 are removed.
On the other hand, when the tip portion 3c of the hook bolt 3 is ground, the surrounding slate 1 is scraped, which may generate dust containing asbestos. Since the circumference of the cylindrical rotating body 11 is surrounded by the cover 50, asbestos-containing dust and foreign matter generated by grinding the tip portion 3c of the hook bolt 3 are difficult to scatter to the outside of the cover 50. In addition, since these asbestos-containing dust and foreign matter are sucked into the dust vacuum cleaner 60 through the dust suction port 55 and the hose 61 , they hardly scatter outside the cover 50 .

According to the polishing apparatus 10 of the present embodiment described above, it is possible to obtain the actions and effects shown in (1) to (3) below.
(1) In the polishing apparatus 10 of the present embodiment, the brush 40 provided inside the cylindrical rotating body 11 can remove foreign matters and the like adhering to the tip portion 3c of the hook bolt 3. FIG. Further, even if dust is generated by scraping the slate 1 around the hook bolt 3 when polishing the tip portion 3c of the hook bolt 3, the cover 50 suppresses the scattering of the dust. The dust inside 50 can also be sucked by the dust sucker 60 through the dust suction port 55 . As described above, according to the grinding apparatus 10 of the above-described embodiment, it is possible to grind the hook bolt 3 more accurately and to suppress scattering of dust generated during grinding.

(2) The cylindrical rotor 11 has an outer cylindrical member 20 and an inner cylindrical member 30 detachably attached to the inner surface of the outer cylindrical member 20 . According to this configuration, by removing the inner cylindrical member 30 from the outer cylindrical member 20, it is possible to remove foreign substances and the like adhering to the brush 40 of the inner cylindrical member 30, so maintenance of the polishing apparatus 10 is facilitated.

(3) The inner cylindrical member 30 is attached to the outer cylindrical member 20 with a screw structure. The inner cylindrical member 30 is assembled to the outer cylindrical member 20 by being screwed into the outer cylindrical member 20 in a direction Db opposite to the rotational direction Da of the cylindrical rotor 11 . According to this configuration, when the cylindrical rotating body 11 rotates, it is possible to avoid loosening of the screw structure of the outer cylindrical member 20 and the inner cylindrical member 30, so that the inner cylindrical member 30 falls off from the outer cylindrical member 20. becomes difficult.

<Second embodiment>
Next, the polishing apparatus 10 of 2nd Embodiment is demonstrated. The following description focuses on differences from the polishing apparatus 10 of the first embodiment.
As shown in FIGS. 7 and 8, the polishing apparatus 10 of the present embodiment is the first embodiment in that a plurality of through holes 111 and 112 are formed through the cylindrical rotating body 11 from the inner surface to the outer surface thereof. The shape is different from that of the polishing apparatus 10 .

The first through-hole 111 is formed so as to pass through the cylindrical portion of the cylindrical rotating body 11 from the inner surface to the outer surface. Specifically, the first through hole 111 is formed to penetrate the cylindrical portion 21 of the outer cylindrical member 20 and the inner cylindrical member 30 .
The second through hole 112 is formed to penetrate the bottom wall portion 22 of the outer cylindrical member 20 . In the present embodiment, the bottom wall portion 22 of the outer cylindrical member 20 corresponds to a portion provided so as to close one end of the cylindrical portion of the cylindrical rotor 11 .

According to the polishing apparatus 10 of the present embodiment described above, it is possible to further obtain the action and effect shown in (4) below.
(4) If a large amount of foreign matter or the like generated by polishing the hook bolt 3 with the brush 40 adheres to the brush 40, the foreign matter removing performance of the polishing apparatus 10 may deteriorate. In this regard, in the polishing apparatus 10 of the present embodiment, foreign matter generated by polishing the hook bolt 3 with the brush 40 is discharged from the inside of the cylindrical rotor 11 to the outside through the through holes 111 and 112. It becomes difficult for foreign matter and the like to accumulate on the surface. As a result, it is possible to maintain the foreign matter removing performance of the polishing apparatus 10 for a longer period of time.

<Third Embodiment>
Next, a third embodiment of the polishing apparatus 10 will be described. The following description focuses on differences from the polishing apparatus 10 of the first embodiment.
As shown in FIG. 9, the cylindrical rotor 11 of this embodiment includes an outer cylindrical member 20, an inner spiral member 70, and a holding member 80. As shown in FIG.

The external cylindrical member 20 of the present embodiment differs from the external cylindrical member 20 of the first embodiment in that the internal threaded portion 23 is not formed on its inner peripheral surface. The inner surface 24 of the bottom wall portion of the outer cylindrical member 20 is formed with a protruding portion 25 with which the inner spiral member 70 contacts. An insertion groove 27 into which the holding member 80 is inserted is formed in the opening inner surface 26 of the outer cylindrical member 20 .

The inner helical member 70 is housed inside the outer cylindrical member 20 . The internal spiral member 70 has a plurality of brushes 71 and a fixed member 72 . In this embodiment, the internal spiral member 70 corresponds to the internal member.
As shown in FIG. 10, the fixing member 72 has a shape extending spirally around the axis m10. The fixing member 72 is made of a metal material such as stainless steel.

As shown in FIG. 9, the plurality of brushes 71 are provided so as to extend from the inner surface of the fixed member 72 toward the axis m10. The brush 71 is made of a resin material such as 6,4-nylon containing an abrasive.
11 and 12 show the front structure and cross-sectional structure, respectively, of the base member 90 used to form the internal spiral member 70. FIG. As shown in FIGS. 11 and 12 , the base member 90 has a fixed member 72 formed to extend linearly and a plurality of brushes 71 formed to extend from the fixed member 72 . . As shown in FIG. 12, the fixing member 72 is formed by bending a flat metal member into a U shape. Base ends of the plurality of brushes 71 are crimped and fixed by a fixing member 72 bent in a U-shape. An internal spiral member 70 as shown in FIG. 10 is formed by spirally plastically deforming the base member 90 shown in FIGS. 11 and 12 so that the brushes 71 face inward.

As shown in FIG. 9, the upper end of the fixing member 72 is in contact with the projecting portion 25 of the outer cylindrical member 20 in the rotational direction Da of the cylindrical rotating body 11. As shown in FIG.
As shown in FIG. 13, the holding member 80 is, for example, a metal C-ring. The holding member 80 is detachably inserted into the insertion groove 27 of the outer cylindrical member 20 . When the holding member 80 is inserted into the insertion groove 27 of the outer cylindrical member 20 as shown in FIG. By removing the holding member 80 from the insertion groove 27 of the outer cylindrical member 20 , the inner spiral member 70 can be removed from the outer cylindrical member 20 .

According to the polishing apparatus 10 of the present embodiment described above, it is possible to obtain the actions and effects shown in (5) to (8) below.
(5) The cylindrical rotor 11 has an outer cylindrical member 20 and an inner spiral member 70 detachably provided inside the outer cylindrical member 20 . According to this configuration, by removing the inner spiral member 70 from the outer cylindrical member 20, the foreign matter and the like adhering to the brush 71 of the inner spiral member 70 can be removed, so maintenance of the polishing apparatus 10 is facilitated.

(6) The cylindrical rotating body 11 is formed with the projecting portion 25 as a suppressing member that suppresses relative rotation of the internal spiral member 70 about the axis m10 with respect to the cylindrical rotating body 11 . According to this configuration, when the outer cylindrical member 20 rotates, the inner spiral member 70 rotates integrally with the outer cylindrical member 20, so that the hook bolt 3 can be ground more accurately. be.

(7) The internal spiral member 70 includes a brush 71 and a fixing member 72 that sandwiches and fixes one end of the brush 71 . The fixing member 72 is formed by being spirally bent so that the brush 71 is positioned inside. According to this configuration, it is possible to easily realize a spiral brush structure.

<Other embodiments>
The above embodiment can also be implemented in the following forms.
- In the polishing apparatus 10 of the second embodiment, only one of the first through-hole 111 and the second through-hole 112 may be formed in the cylindrical rotor 11 . In addition, a single first through-hole 111 or a single second through-hole 112 may be formed in the cylindrical rotating body 11 .

- In the polishing apparatus 10 of the third embodiment, for example, the projection formed on the internal spiral member 70 is fitted into the recess formed on the inner peripheral surface of the external cylindrical member 20, so that the inner surface of the cylindrical rotating body 11 is reduced. Relative rotation of the spiral member 70 may be suppressed.
- The cylindrical rotating body 11 of 1st Embodiment and 2nd Embodiment may consist of the single member which the external cylindrical member 20 and the internal cylindrical member 30 were integrated. Further, the cylindrical rotating body 11 of the third embodiment may be composed of a single member in which the outer cylindrical member 20 and the inner spiral member 70 are integrated.

- The drive part 12 of each embodiment may rotate the output shaft 120 by using not only an electric motor but compressed air as a power source, for example.
- The present disclosure is not limited to the above specific examples. Appropriate design changes made by those skilled in the art to the above specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above, and its arrangement, conditions, shape, etc., are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

3 Hook bolt 10 Grinding device 11 Cylindrical rotor 20 External cylindrical member 25 Protruding part (suppressing member) 30 Internal cylindrical member (internal member) 40, 71 Brush 50 Cover , 55... dust suction port, 60... dust sucker, 70... internal spiral member (internal member), 72... fixed member, 111... first through hole, 112... second through hole.

Claims (10)

A polishing device for polishing hook bolts,
a cylindrical rotating body having a cylindrical shape centered on a predetermined axis and having a brush on the inner surface;
a cover arranged to surround the cylindrical rotating body,
The hook bolt polishing apparatus, wherein the cover is provided with a dust suction port to which a dust suction device for sucking dust generated inside the cover can be connected. The cylindrical rotating body is
an external cylindrical member that rotates around the axis when power is transmitted from the drive unit;
2. The hook bolt grinding apparatus according to claim 1, further comprising an inner member detachably provided inside said outer cylindrical member and having said brush provided on its inner surface. 3. The hook bolt grinding apparatus according to claim 2, wherein the internal member is an internal cylindrical member formed in a cylindrical shape and having the brush on the inner surface thereof. The inner cylindrical member is assembled to the outer cylindrical member by a screw structure,
4. The hook bolt grinding apparatus according to claim 3, wherein the inner cylindrical member is assembled to the outer cylindrical member by being screwed into the outer cylindrical member in a direction opposite to the rotating direction of the cylindrical rotating body. 3. The hook bolt sharpening device according to claim 2, wherein the internal member is an internal spiral member formed spirally about the axis and having the brush on an inner surface thereof. 6. The hook according to claim 5, wherein at least one of the cylindrical rotating body and the internal spiral member is provided with a suppressing member that suppresses relative rotation of the internal spiral member about the axis with respect to the cylindrical rotating body. Polishing equipment for bolts. 7. The hook bolt sharpening apparatus according to claim 6, wherein the inner surface of the cylindrical rotating body is provided with a projecting portion as the restraining member, which contacts the internal spiral member in the direction of rotation about the axis. The internal helical member is
the brush;
a fixing member that sandwiches and fixes one end of the brush,
The hook bolt sharpening device according to any one of claims 5 to 7, wherein the fixing member is spirally bent so that the brush is positioned inside. The hook bolt grinding device according to any one of claims 1 to 8, wherein a through hole penetrating from the inner surface to the outer surface is provided in the cylindrical rotating body. The cylindrical rotating body is formed in a bottomed cylindrical shape,
The cylindrical rotating body is provided with a first through hole that penetrates the cylindrical portion from the inner surface to the outer surface as the through holes, and a first through hole that closes one end of the cylindrical portion. 10. The hook bolt sharpening device according to claim 9, wherein a second through hole is formed through the bottom wall portion of the hook bolt from the inner surface to the outer surface.

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