JP2022179276A - Slate polishing device and polishing method - Google Patents

Abstract

To provide a slate polishing device which may polish a surface layer of a wavy slate more properly and inhibit scattering of powder dust occurring during polishing.SOLUTION: A polishing device 10 includes: a brush 60 which vertically rotates around a predetermined center axis m10 relative to a surface of a slate to polish a surface layer of the slate; and a cover 20 which is provided so as to enclose a periphery of the brush 60. An outer periphery part of the brush 60 which contacts with the surface of the slate is formed in a wavy shape in a direction in which the center axis m10 extends.SELECTED DRAWING: Figure 5

Description

The present invention relates to a slate polishing apparatus and a polishing method.

Conventionally, there are slates whose main materials are cement and 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 slate. As a device capable of removing such slate, there is a slate removing device described in Patent Document 1 below.

The slate removing device described in Patent Document 1 includes a dust vacuum cleaner and a hood. A dust vacuum cleaner sucks, through a filter, dust that is generated when exterior materials of a building or slates fixed to the roof are removed. 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 slate.

Japanese Unexamined Patent Application Publication No. 2007-205110

By the way, when a building with a slate roof has deteriorated, it is desirable to replace the roof. It can be difficult. Specifically, when the roof of a factory building is replaced, there is a risk that products cannot be manufactured in that building for a long period of time while the roof is being replaced. In addition, a large amount of money is required to replace the roof. Due to these circumstances, there are many businesses that cannot afford to replace their aging roofs.

Therefore, the inventors are studying a method of extending the life of the roof by applying a predetermined reinforcing agent to the surface of the slate to reinforce the roof. When reinforcing the slate by such a method, in order to properly apply the reinforcing agent to the surface of the slate, it is necessary to remove the foreign matter accumulated on the surface of the slate by polishing the surface layer of the slate. There is In this respect, the slate removing device described in Patent Document 1 can suck dust generated when removing the slate fixed to the roof, but does not have the function of polishing the surface layer of the slate. Therefore, a new device capable of polishing the surface layer of the slate is desired. In addition, when the surface layer of the slate is actually polished, there is a possibility that the dust of the slate generated during the polishing will scatter around, so it is necessary to take measures to suppress it.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to suppress the scattering of dust generated during polishing while enabling the surface layer of a wavy slate to be polished more accurately. To provide a slate polishing apparatus and a polishing method capable of

A slate polishing apparatus for solving the above problems is a polishing apparatus for polishing a surface layer of a slate, comprising: a brush for polishing the surface layer of the slate by longitudinally rotating about a predetermined central axis with respect to the surface of the slate; and a cover provided to surround the brush. The outer peripheral portion of the brush, which contacts the surface of the slate, is wavy in the direction in which the central axis extends.

According to this configuration, since the outer peripheral portion of the brush that contacts the surface of the slate is formed in a wavy shape, the outer peripheral portion of the brush can be brought into contact with the wavy slate more accurately. Therefore, when the brush is vertically rotated with respect to the surface of the slate, it is possible to polish the wavy surface layer of the slate more appropriately. Moreover, the cover provided so as to surround the brush can suppress scattering of dust generated by the brush polishing the surface layer of the slate.

In the above-described slate polishing apparatus, it is desirable that the end portion of the cover facing the surface of the slate is wavy in the direction in which the central axis extends.
According to this configuration, since the end of the cover is arranged along the wavy surface of the slate, the gap formed between the surface of the slate and the end of the cover can be made as narrow as possible. . As a result, it is possible to prevent dust generated by polishing the surface of the slate with the brush from scattering to the outside from the inside of the cover through the gap formed between the surface of the slate and the edge of the cover.

In the slate polishing apparatus described above, the cover is preferably made of an elastic material.
According to this configuration, it is possible to bring the cover into close contact with the surface of the slate by utilizing the elastic deformation of the cover, so that it is possible to more accurately suppress scattering of dust from the inside of the cover to the outside.

In the slate polishing apparatus described above, the brush is preferably formed by combining a plurality of brush members having different outer diameters around the central axis in the direction along the central axis.
According to this configuration, by using a plurality of existing brush members having different outer diameter lengths, it is possible to easily realize a brush having a wavy outer shape.

In the slate polishing apparatus described above, the brush is preferably formed as a single unitary piece.
This configuration can be realized, for example, by cutting the outer periphery of a single brush having a constant outer diameter in a wavy shape, so that a brush having a wavy outer shape can be easily formed.

The slate polishing apparatus described above preferably further includes a sensor device capable of detecting asbestos that has leaked to the outside of the cover.
According to this configuration, even if asbestos leaks to the outside of the cover, it can be detected, so it is possible to ensure the safety of the operator more accurately.

It is preferable that the above slate polishing apparatus further include an injection section for injecting a liquid onto the surface of the slate.
According to this configuration, since the surface layer of the slate can be impregnated with liquid, it is possible to more accurately suppress scattering of dust generated during polishing.

The slate polishing apparatus described above preferably further includes a recovery device for recovering the waste water discharged from the cover.
According to this configuration, even if waste water containing dust is discharged to the outside of the cover, it is possible to reliably collect the waste water.

A slate polishing method for solving the above problems is a polishing method for polishing a surface layer of a slate, comprising steps of removing a roof material or exterior wall material containing asbestos from a building, and sanding the roofing material or exterior wall material removed from the building; and attaching the sanded roofing material or exterior wall material to the building.

According to this method, even if it is difficult to polish the slate while it is attached to the building, the surface layer of the slate can be polished more reliably.

According to the slate polishing apparatus and the polishing method of the present invention, it is possible to more accurately polish the surface layer of a wavy slate while suppressing scattering of dust generated during polishing.

1 is a diagram schematically showing the schematic configuration of a slate polishing apparatus according to a first embodiment; FIG. The perspective view which shows the perspective structure of the slate of 1st Embodiment. (A) is a side view showing the side structure of the small wave slate. (B) is a side view showing the side structure of the big wave slate. The perspective view which shows the perspective structure of the grinder main body of 1st Embodiment. Sectional drawing which shows the partial cross-sectional structure of the grinder main body of 1st Embodiment. The front view which shows the front structure of the handle|steering-wheel of 1st Embodiment. The perspective view which shows the perspective structure of the brush member of 1st Embodiment. The side view which shows the side structure of the cover of the grinder main body of 1st Embodiment. The side view which shows the side structure of the cover of the grinder main body of 2nd Embodiment. The figure which shows typically schematic structure of the polishing apparatus of the slate of 3rd Embodiment. The figure which shows typically schematic structure of the polishing apparatus of the slate of 3rd Embodiment. A cross-sectional view showing a cross-sectional structure of a concave recovery portion of a modified example of the third embodiment. 10 is a flow chart showing the procedure of a polishing method according to the fourth embodiment; The perspective view which shows the perspective structure of the brush of other embodiment. The side view which shows the side structure of the cover of the grinder main body of other embodiment.

<First embodiment>
An embodiment of a slate polishing 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.

As shown in FIG. 1, a slate polishing apparatus 10 of the present embodiment is an apparatus for polishing the surface layer of a slate 3 used as a roofing material of a building 2 . The slate 3 is made mainly of cement and asbestos, and has a wavy shape with alternating peaks 3a and valleys 3b in the directions indicated by arrows X1 and X2 as shown in FIG. is formed in The slate 3 includes a large wave slate in which the wave pitch P10 is set to a large value L11 as shown in FIG. There are set wavelet slates and the like. In addition, the slate 3 includes a medium wave slate in which the wave pitch P10 is set to an intermediate value between "L11" and "L12".

Hereinafter, of the directions perpendicular to the surface of the slate 3, the direction toward the front in the vertical direction is referred to as "upward Z1", and the direction toward the downward direction in the vertical direction is referred to as "downward Z2". Further, the direction indicated by arrow X1 is called "right direction X1", and the direction indicated by arrow X2 is called "left direction X2".

As shown in FIG. 1 , the polishing apparatus 10 includes a polishing machine body 11 , a dust collection can 12 and a dust vacuum cleaner 13 . The grinder main body 11 and the dust collection can 12 are connected to each other through a first hose 14 . The dust collection can 12 and the dust vacuum cleaner 13 are connected to each other via a second hose 15 .

The polishing machine main body 11 is a portion that actually polishes the surface layer of the slate 3 . After being installed on the upper surface of the slate 3, the grinder main body 11 is operated by an operator. The surface layer of the slate 3 is polished by the polishing machine main body 11 when the worker slides the polishing machine main body 11 on the upper surface of the slate 3 . FIG. 1 shows, as an example, a situation in which the operator pushes the grinder main body 11 toward the downward direction of the slate 3 , but the operator moves toward the upward direction of the slate 3 . You may operate so that the grinder main body 11 may be pushed. The moving direction of the grinder main body 11 is the direction indicated by the arrows Y1 and Y2 shown in FIG. 2, that is, the direction perpendicular to the directions X1 and X2 in which the slate 3 is formed in a wavy shape. Hereinafter, the direction indicated by arrow Y1 will be referred to as "forward Y1", and the direction indicated by arrow Y2 will be referred to as "backward Y2".

Dust generated when the grinder body 11 grinds the surface layer of the slate 3 is sucked into the dust collection can 12 through the first hose 14 based on the suction force of the dust vacuum cleaner 13 .
The dust collection can 12 is a part for collecting relatively large asbestos-containing dust such as dust residue among the dust generated when the grinder main body 11 grinds the surface layer of the slate. Relatively small asbestos-containing dust that cannot be collected by the dust collection can 12 is further sucked into the dust vacuum cleaner 13 through the second hose 15 based on the suction power of the dust vacuum cleaner 13 .

The dust vacuum cleaner 13 is a device for sucking dust generated when the grinder main body 11 grinds the surface layer of the slate 3 by being driven based on power supply. The dust collector 13 includes a dust pack 130 for collecting small asbestos-containing dust contained in the air sucked from the dust collection can 12 through the second hose 15, and even finer asbestos-containing dust that cannot be collected by the dust pack 130. It has a multilayer filter structure 131 inside for collecting dust. 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 asbestos-containing dust that cannot be collected by the dust pack. 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, a specific structure of the grinder main body 11 of this embodiment will be described.
As shown in FIG. 4, the grinder body 11 includes a cover 20, a frame 30, and a motor 40. As shown in FIG.
The cover 20 has an upper cover 21 and a lower cover 22 .

The upper cover 21 has a peripheral plate 210 formed in a semi-cylindrical shape around the central axis m10, and a right side plate 211 and a left side plate 212 provided to close both sides of the peripheral plate 210, respectively. ing. The central axis m10 is a direction parallel to the left and right directions X1 and X2. The circumferential plate 210 and side plates 211 and 212 are made of metal material. Specifically, the circumferential plate 210 is made of steel such as SPC, and the side plates 211 and 212 are made of aluminum or the like. The plate thickness of the side plates 211 and 212 is slightly thicker than the plate thickness of the circumferential plate 210 . The upper cover 21 is arranged so that its opening faces downward Z2.

The lower cover 22 is formed in a substantially rectangular annular shape, and is joined to the lower end portion of the upper cover 21 over the entire circumference by adhesion or the like. The lower cover 22 is made of an elastic material such as transparent rubber. The lower end portion of the front skirt portion 220, which is arranged in the front Y1 of the lower cover 22, is formed in a wavy shape so as to alternately have trough portions 220a and peak portions 220b in the horizontal directions X1 and X2. Similarly, the lower end of the rear hem portion 221 arranged in the rear Y2 of the lower cover 22 is also formed in a wavy shape so as to alternately have troughs 221a and peaks 221b in the horizontal directions X1 and X2. The wave pitch of each of the front skirt portion 220 and the rear skirt portion 221 is, for example, a value L11 corresponding to the pitch P10 of the small wave slate shown in FIG. 3A, or the pitch of the large wave slate shown in FIG. It is set to a value corresponding to the wave pitch P10 of the slate 3 to be polished, such as a value L12 corresponding to P10. In the lower cover 22, the lower end of the right side skirt portion 222 arranged in the right direction X1 and the lower end portion of the left side skirt portion 223 arranged in the left direction X2 are formed in a straight line, and are formed in a wavy shape. It has not been.

As shown in FIG. 4 , the frame 30 has a right vertical frame 31 , a left vertical frame 32 and a horizontal frame 33 . The frame 30 is made of a metal material such as aluminum.
The right vertical frame 31 is arranged along the right side plate 211 of the upper cover 21 . The left vertical frame 32 is arranged along the left side plate 212 of the upper cover 21 . The left vertical frame 32 is formed longer than the right vertical frame 31 . As shown in FIG. 5 , the upper end of the right vertical frame 31 is fastened and fixed to the right end of the horizontal frame 33 with bolts 34 . The left end portion of the horizontal frame 33 is fastened and fixed to the vicinity of the central portion of the left vertical frame 32 by bolts 35 . With such a fastening structure, the right vertical frame 31, the left vertical frame 32, and the horizontal frame 33 are integrally connected.

As shown in FIG. 4 , a protrusion 330 is formed on the upper surface of the horizontal frame 33 . A threaded hole 331 is formed in the projecting portion 330 . The handle 100 shown in FIG. 6 is assembled in the screw hole 331 .
As shown in FIG. 6, the handle 100 is formed in a substantially T shape, and includes a shaft portion 101 formed to extend in the vertical directions Z1 and Z2 and a grip portion 102 formed to extend in the horizontal direction. and The grip portion 102 is a portion that is gripped by the operator with both hands. A threaded portion 101 a is formed at the tip of the shaft portion 101 . The handle 100 is integrally fixed to the horizontal frame 33 by screwing the threaded portion 101a into the screw hole 331 of the horizontal frame 33 shown in FIG.

As shown in FIG. 5 , a right shaft portion 51 provided at the right end portion of the rotating shaft 50 is connected to the tip portion of the right vertical frame 31 . A left shaft portion 52 provided at the left end portion of the rotating shaft 50 is connected to the tip portion of the left vertical frame 32 . Specifically, an insertion hole 310 is formed through the right vertical frame 31 in its thickness direction. A bearing 311 is provided in the insertion hole 310 . Similarly, an insertion hole 320 is formed through the tip of the left vertical frame 32 in its thickness direction. A bearing 321 is provided in the insertion hole 320 . The right shaft portion 51 and the left shaft portion 52 of the rotating shaft 50 are inserted into the insertion hole 310 of the right vertical frame 31 and the insertion hole 320 of the left vertical frame 32 respectively, and are rotatably supported by bearings 321 .

A brush 60 is attached to the outer peripheral portion of the rotating shaft 50 arranged between the right vertical frame 31 and the left vertical frame 32 . The brush 60 is composed of small-diameter brush members 61 and large-diameter brush members 62 alternately arranged in the direction along the central axis m10. The brush 60 is a part that polishes the surface layer of the slate 3 by rotating around the central axis m10.

As shown in FIG. 7, the small-diameter brush member 61 includes a disc-shaped core member 610 having an axial hole 610a formed in the center thereof, and a large number of disc-shaped core members 610 extending radially outward from the outer peripheral surface of the core member 610. and a brush piece 611 . The core material 610 is made of, for example, a metal material. The brush pieces 611 are made of a resin material such as 6,4-nylon. 7, only a portion of the brush pieces 611 provided on the small-diameter brush member 61 is shown, and the outer peripheral portion of the brush pieces 611, which is not shown, is indicated by a two-dot chain line. As shown in FIG. 5, the rotating shaft 50 is inserted into the shaft hole 610a of the core member 610 and fixed. Thereby, the small-diameter brush member 61 is integrally attached to the rotary shaft 50 .

The large-diameter brush member 62 has a structure similar to that of the small-diameter brush member 61 except that it has a larger outer diameter than the small-diameter brush member 61 .
As shown in FIG. 5 , the flange portion 53 of the rotation shaft 50 is arranged between the large-diameter brush member 62 arranged at the end of the brush 60 in the left direction X2 and the left vertical frame 32 . A washer 70 is arranged in a compressed state between the large-diameter brush member 62 arranged at the end of the brush 60 in the right direction X1 and the right vertical frame 31 . The plurality of small-diameter brush members 61 and the plurality of large-diameter brush members 62 are sandwiched between the flange portion 53 of the rotating shaft 50 and the washer 70, thereby integrally assembled in the direction along the central axis m10.

In the grinder main body 11 of the present embodiment, the small diameter brush members 61 and the large diameter brush members 62 are alternately arranged in the direction along the central axis m10, so that the outer peripheral surface of the brush 60 is formed in a pseudo wavy shape. It is The wave pitch of the brush 60 is set to a value corresponding to the wave pitch P10 of the slate 3 to be polished, similarly to the wave pitches of the front skirt portion 220 and the rear skirt portion 221 of the lower cover 22 shown in FIG. It is

As shown in FIGS. 5 and 8, the brush 60 is housed inside the cover 20 shown in FIG. In FIG. 5, only the outer shape of the cover 20 is indicated by a two-dot chain line, and the detailed structure thereof is omitted. As shown in FIG. 8, a cylindrical dust suction port 213 is provided on the rear surface of the upper cover 21 located in the rear Y2. The dust suction port 213 communicates with the internal space of the cover 20 . The first hose 14 shown in FIG. 1 is connected to the dust suction port 213 .

As shown in FIG. 8, a water pipe 110 is provided on the front surface of the upper cover 21 located in front Y1. As shown in FIG. 4, the water tube 110 is formed on the front surface of the upper cover 21 so as to extend in the horizontal directions X1 and X2. A plurality of injection ports are formed in the bottom surface of the water pipe 110 at predetermined intervals in the horizontal directions X1 and X2. Water is supplied to the water tube 110 via a hose 111 . A cock valve 112 is provided in the middle of the hose 111 so that an operator can manually switch between supplying and stopping the supply of water to the water tube 110 . In this embodiment, the water pipe 110 corresponds to the injection part. Also, the water jetted from the water pipe 110 corresponds to the liquid jetted onto the surface of the slate 3 .

As shown in FIG. 4 , a motor 40 is connected to the upper end of the left vertical frame 32 via a speed reducer 80 .
The motor 40 is connected via a cord 41 to a power source (not shown). The motor 40 is driven based on power supplied via a cord 41 from a power supply.

The speed reducer 80 reduces the output torque of the motor 40 via a plurality of gears and outputs the reduced speed. As shown in FIG. 5 , the output shaft 81 of the speed reducer 80 is arranged to pass through the left vertical frame 32 and protrude from the side surface of the left vertical frame 32 . The grinder main body 11 further includes a belt 90 that connects the output shaft 81 of the speed reducer 80 and the left shaft portion 52 of the rotating shaft 50 .

Specifically, the tip of the left shaft portion 52 of the rotating shaft 50 is arranged to protrude from the left side surface of the left vertical frame 32 . A pulley 92 is provided at the tip of the left shaft portion 52 of the rotating shaft 50 . Similarly, a pulley 91 is also provided at the tip of the output shaft 81 of the speed reducer 80 . A belt 90 is wound around the pulleys 91 and 92 , so that the output shaft 81 of the speed reducer 80 is connected to the left shaft portion 52 of the rotating shaft 50 via the belt 90 .

Next, an operation example of the polishing apparatus 10 of this embodiment will be described.
First, the grinder main body 11 is arranged with respect to the surface of the slate 3 as shown in FIG. 8, for example. That is, the grinder main body 11 is moved so that the lower end of the outer periphery of the large-diameter brush member 62 contacts the troughs 3b of the slate 3 and the lower end of the outer periphery of the small-diameter brush member 61 contacts the peaks 3a of the slate 3. placed. At this time, a part of each of the small-diameter brush member 61 and the large-diameter brush member 62 comes into contact with the intermediate portions of the trough portion 3b and the peak portion 3a of the slate 3 .

Further, since the lower cover 22 is made of an elastic material, the lower end of the lower cover 22 is in close contact with the surface of the slate 3 over the entire circumference. For example, the valleys 220a and 221a of the front skirt 220 and the rear skirt 221 of the lower cover 22 shown in FIG. and the peaks 220b, 221b of the rear skirt 221 contact the troughs 3b of the slate. Also, the right skirt portion 222 and the left skirt portion 223 of the lower cover 22 contact the valley portion 3 b of the slate 3 . Since the lower end portion of the lower cover 22 is in close contact with the surface of the slate 3 over the entire circumference in this manner, scattering of dust from the inside of the cover 20 to the outside is suppressed.

After placing the grinder main body 11 on the surface of the slate 3 as shown in FIG. 8, when the operator opens the cock valve 112 shown in FIG. , water is jetted from the water pipe 110 to a predetermined range of the slate 3 positioned in front Y1 of the cover 20 . As a result, the surface layer of the slate 3 can be impregnated with water, so that dust generated when the surface layer of the slate 3 is polished by the brush 60 can be suppressed from scattering in the air.

When the operator actually polishes the surface layer of the slate 3, the operator supplies power to the motor 40 by connecting the cord 41 shown in FIG. As a result, when the motor 40 is driven, the output torque of the motor 40 is transmitted to the rotating shaft 50 via the reduction gear 80 and the belt 90, so that the brush 60 is integrated with the rotating shaft 50 and rotates about the central axis m10. Rotate. That is, the brush 60 rotates longitudinally with respect to the surface of the slate 3, as shown in FIG. At this time, since the lower end of the brush 60 is in contact with the surface of the slate 3 , the rotation of the brush 60 scrapes off the surface layer present in a region from the surface of the slate 3 to a predetermined depth. The dust generated at this time contains not only the foreign matter adhering to the surface of the slate 3 but also a part of the surface layer of the slate 3, that is, asbestos. The asbestos-containing dust generated inside the cover 20 is sucked into the dust collection can 12 through the dust suction port 213 and the first hose 14 based on the suction force of the dust vacuum cleaner 13 shown in FIG.

The dust collection can 12 collects relatively large asbestos-containing dust among the dust sucked through the first hose 14 . The asbestos-containing dust that cannot be collected by the dust collection can 12 is further sucked into the dust collector 13 through the second hose 15 based on the suction force of the dust collector 13 . In the dust vacuum cleaner 13, minute asbestos-containing dust is collected by a dust pack 130 and a multilayer filter structure 131 provided therein.

An operator can grind an arbitrary area of the slate 3 by sliding the grinder main body 11 in the front-rear direction Y1, Y2 with respect to the surface of the slate 3 while gripping the handle 100. FIG.
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 (5) below.

(1) The outer peripheral portion of the brush 60 that contacts the surface of the slate 3 is formed in a wavy shape in the direction in which the central axis m10 extends. According to this configuration, the outer peripheral portion of the brush 60 can be brought into contact with the wavy slate 3 more accurately. The surface layer of 3 can be polished. Moreover, the cover 20 provided so as to surround the brush 60 can also suppress scattering of dust generated when the brush 60 polishes the surface layer of the slate 3 .

(2) Lower ends of the front skirt portion 220 and the rear skirt portion 221 facing the surface of the slate 3 in the cover 20 are formed in a wave shape in the direction in which the central axis m10 extends. According to this configuration, the gap formed between the surface of the slate 3 and the skirts 220 and 221 of the cover 20 can be made as narrow as possible. As a result, it is possible to suppress the dust generated by the brush 60 grinding the surface layer of the slate 3 from scattering from the inside of the cover 20 to the outside through the gap formed between the surface of the slate 3 and the cover 20. .

(3) The cover 20 is made of rubber. According to this configuration, since the skirts 220 to 223 of the cover 20 can be brought into close contact with the surface of the slate 3 by utilizing the elastic deformation of the cover 20, scattering of dust from the inside of the cover 20 to the outside can be further prevented. It is possible to suppress it accurately.

(4) The brush 60 is formed by combining a small-diameter brush member 61 and a large-diameter brush member 62 having different outer diameters around the central axis m10 in the direction along the central axis m10. According to this configuration, by using a plurality of existing brush members 61 and 62 having different outer diameter lengths, the brush 60 having a wavy outer diameter can be easily realized.

(5) The polishing apparatus 10 further includes a water pipe 110 for spraying water onto the surface of the slate 3 . According to this configuration, the surface layer of the slate 3 can be impregnated with water, so that scattering of dust generated during polishing can be suppressed more accurately.
<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 FIG. 9, the grinder main body 11 of this embodiment further includes a sensor device 16 capable of detecting asbestos. The sensor device 16 is a well-known asbestos detection device and includes a detection section 160 and a display section 161 . The detector 160 is a part that detects asbestos contained in the air around it. The display unit 161 is, for example, a display, and outputs whether or not asbestos is detected by the detection unit 160 using characters, images, or the like. Instead of the display unit 161, an appropriate output device such as a speaker for outputting whether or not asbestos is detected by the detection unit 160 by voice may be used.

According to the polishing apparatus 10 of this embodiment described above, it is possible to further obtain the action and effect shown in (6) below.
(6) When dust containing asbestos leaks outside the cover 20, the asbestos is detected by the detector 160. FIG. In this case, the fact that asbestos has been detected is displayed on the display unit 161 , so that the operator can easily notice that the asbestos is leaking outside the cover 20 by visually recognizing the display unit 161 . Therefore, it is possible to ensure the safety of workers more accurately.

<Third Embodiment>
Next, the polishing apparatus 10 of 3rd Embodiment is demonstrated. The following description focuses on differences from the polishing apparatus 10 of the first embodiment.
As shown in FIG. 10 , a polishing apparatus 10 of this embodiment is used to polish a slate 4 used as an exterior wall material for a building 2 . As shown in FIG. 11, the peaks 4a and valleys 4b of the slate 4 extend vertically. When the slate 4 is used as the exterior wall material in this way, as shown in FIG. By operating in the upward and downward directions, the surface of the slate 4 can be polished.

In the polishing apparatus 10 having such a configuration, as shown in FIG. 11, the water jetted from the water pipe 110 to the front of the cover 20 flows downward along the slate 4 and enters the cover 20. Dust on the slate 4 polished by the brush 60 inside the cover 20 is discharged from behind the cover 20 together with water flowing inside the cover 20 . Therefore, the water discharged from behind the cover 20 may contain asbestos. The polishing apparatus 10 of the present embodiment further includes a recovery device 17 that recovers the discharged water containing asbestos.

The recovery device 17 includes a first suction portion 171 , a second suction portion 172 , a concave recovery portion 173 and a recovery can 174 .
The first suction portion 171 is attached to the rear portion of the lower cover 22 . The first suction part 171 is connected to a collection can 174 via a hose 175a. The first suction part 171 sucks the waste water existing inside the cover 20 based on the suction force of the collection can 174 .

The second suction part 172 is arranged in the valley part 4 b of the slate 4 behind the grinder main body 11 . The second suction part 172 is connected to the collection can 174 via a hose 175b. The second suction part 172 sucks the wastewater discharged outside the cover 20 from the space inside the cover 20 of the grinder main body 11 based on the suction force of the collection can 174 .

The concave recovery part 173 is arranged at the lower end of the slate 4 in the vertical direction. The concave collection portion 173 is made of vinyl chloride, iron, rubber, or the like. Waste water that could not be sucked by the first suction part 171 and the second suction part 172 flows into the concave collection part 173 . The concave recovery portion 173 is connected to the recovery can 174 via a hose 175c.

The collection can 174 sucks the wastewater from the first suction portion 171 and the second suction portion 172 through the hoses 175a and 175b. Also, the recovery can 174 sucks the waste water accumulated in the concave recovery portion 173 through the hose 175c.
According to the polishing apparatus 10 of this embodiment described above, it is possible to further obtain the action and effect shown in (7) below.

(7) Even if waste water containing asbestos is discharged from the cover 20, the waste water can be reliably recovered by the recovery device 17.
(Modification)
Next, a modified example of the polishing apparatus 10 of the third embodiment will be described.

When using the concave collecting part 173 as shown in FIG. 11, the concave collecting part 173 cannot be arranged unless a predetermined gap exists between the lower end of the slate 4 and the ground. Therefore, as shown in FIG. 12, the concave collecting portion 173 may be formed of rubber and arranged such that one side wall portion 173a thereof is in close contact with the valley portion 3b of the slate 4. As shown in FIG. According to such a configuration, even if there is no gap between the lower end of the slate 4 and the ground, the concave recovery portion 173 can recover the drainage that has flowed to the lower end of the slate 4 . It becomes possible.

<Fourth Embodiment>
Next, the polishing apparatus 10 of 4th Embodiment is demonstrated. The following description focuses on differences from the polishing apparatus 10 of the first embodiment.
As shown in FIG. 10, when the grinder main body 11 is arranged along the slate 4 constituting the exterior wall material, the operator must operate the grinder main body 11 in the vertical direction. However, when operating the grinder main body 11 in this way, the operator must support the entire weight of the grinder main body 11, and there is a possibility that the grinder main body 11 cannot be operated appropriately.

Therefore, when polishing the slate 4 constituting the outer wall material, it is effective to employ a polishing method such as that shown in FIG. 13, for example.
As shown in FIG. 13, the worker first removes the slate 4 from the building 2 (step S10). Subsequently, the operator places the removed slate 4 on a flat surface, and then polishes the surface layer of the slate 4 using the polishing device 10 (step S11). After that, the worker attaches the polished slate 4 to the building 2 (step S12).

It should be noted that the method of this embodiment is not limited to the slate 4 that constitutes the exterior wall material, but can also be used for the slate 3 that constitutes the roof material. In this embodiment, the slate 4 corresponds to the exterior wall material containing asbestos, and the slate 3 corresponds to the roof material containing asbestos.
According to the polishing method of the present embodiment described above, it is possible to further obtain the action and effect shown in (8) below.

(8) Even when the slate 4 is used as the outer wall material, the surface layer of the slate 4 can be polished more reliably.
<Other embodiments>
The above embodiment can also be implemented in the following forms.

- In the polishing apparatus 10 of the first embodiment, there is a possibility that the wastewater containing the polished dust may flow downward along the valley portion 3b of the slate 3 that constitutes the roof material of the building 2 . A device similar to the recovery device 17 of the third embodiment may be used as a device for recovering the waste water. For example, a recessed collecting portion 173 is placed at the lower end of the slate 3 shown in FIG. A gutter provided on the roof of the construction section 2 can be used as the concave recovery section 173 . The waste water collected in this concave recovery portion 173 is recovered by a recovery can 174 through a hose 175c. According to this configuration, it is possible to more reliably collect the waste water containing dust.

- The lower cover 22 may be replaceably attached to the upper cover 21 . Thus, a plurality of lower covers 22 having different wave pitches are prepared in advance, and the lower cover 22 corresponding to the wave pitch P10 of the slate 3 to be polished is attached to the upper cover 21, thereby forming one polishing machine body 11. , it is possible to deal with a plurality of slates 3 having different wave pitches.

The brush 60 is not limited to a combination of two types of small-diameter brush members 61 and large-diameter brush members 62 having different outer diameter lengths, and may include three or more types of brushes having different outer diameter lengths. It may be formed by a combination of brush members.
- The shape of the brush 60 can be changed as appropriate. For example, as shown in FIG. 14, the brush 60 may be formed as a single integral body having a wavy outer peripheral portion in the direction in which the central axis m10 extends. This configuration can be realized, for example, by cutting the outer periphery of a single brush having a constant outer diameter in a wavy shape, so that a brush having a wavy outer diameter can be easily formed.

- The lower cover 22 may be made of any material other than the elastic material.
- As shown in FIG. 15, the cover 20 may be further provided with a level roller 120 having a roller portion 121 that contacts the surface of the slate 3 . According to this configuration, it is possible to stabilize the sliding movement of the grinder main body 11 with respect to the wave-shaped slate 3 .

- 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.

m10...Center shaft, 3...Slate, 10...Polishing device, 20...Cover, 60...Brush, 61...Small diameter brush member, 62...Large diameter brush member, 110...Water pipe (injection part).

Claims (9)

A polishing device for polishing a surface layer of a slate,
a brush for polishing the surface layer of the slate by longitudinally rotating around a predetermined central axis with respect to the surface of the slate;
a cover provided to surround the brush,
The slate polishing apparatus, wherein an outer peripheral portion of the brush that contacts the surface of the slate is formed in a wavy shape in a direction in which the central axis extends. 2. The slate polishing apparatus according to claim 1, wherein an end portion of said cover facing the surface of said slate is formed in a wavy shape in a direction in which said central axis extends. The slate polishing apparatus according to claim 2, wherein the cover is made of an elastic material. 4. The brush according to any one of claims 1 to 3, wherein the brush is formed by combining a plurality of brush members having different outer diameters around the central axis in a direction along the central axis. slate polishing equipment. The slate polishing apparatus according to any one of claims 1 to 3, wherein the brush is formed as a single unitary body. The slate polishing apparatus according to any one of claims 1 to 5, further comprising a sensor device capable of detecting asbestos leaking out of the cover. The slate polishing apparatus according to any one of claims 1 to 6, further comprising an injection section for injecting liquid onto the surface of the slate. The slate polishing apparatus according to any one of claims 1 to 7, further comprising a recovery device for recovering waste water discharged from the inner space surrounded by the cover to the outside of the cover. A polishing method for polishing a surface layer of a slate,
removing asbestos-containing roofing or siding from the building;
polishing the roof material or exterior wall material removed from the building using the polishing apparatus according to any one of claims 1 to 8;
and attaching the roof material or the exterior wall material polished by the polishing device to the building.

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