JP2019072802A - Grinding device and dust collection system utilizing the same - Google Patents

Abstract

To provide a grinding device with high sealability that is configured to prevent powder dust such as ground chips and asbestos from scattering around.SOLUTION: An outer wall 16 is formed across the whole circumference of an outer periphery of a main body case 12 of a grinding device 10, a circular inner wall 18 is formed at a predetermined interval inside the wall, and a rotary blade which can be rotated by a driving device 30 is provided in a space 20 inside the inner wall 18. Further, a ring-shape inner cover 90 is provided across the whole circumference of a tip 18A of the inner wall 18, and a ring-shape outer cover 100 is provided across the whole circumference of an inner periphery of the tip 16A of the outer wall 16. On an upper surface of the space 20 inside the inner wall 18 is formed an inner dust collection port to be connected to an inner duct 72, and on an upper surface of a space 22 between he inner wall 18 and the outer wall 16 is formed an outer dust collection port to be connected to an outer duct 82. The outer duct 82 is connected to the inner duct 72, at the outside of the case main body 12, and the inner duct 72 is connected to an external decompression dust collection device through a hose 76.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grinding apparatus for grinding a coating film containing asbestos and the like, and a dust collection system using the same, and more specifically to improvement of dust collection efficiency.

  For example, there are technologies described in Patent Document 1 and Patent Document 2 below as a technology in which asbestos that is harmful to human bodies is not scattered when grinding and removing asbestos applied to a ceiling or a wall surface. . In Patent Document 1, a rotary brush is attached to an electric drill so as to be able to synchronously rotate, and a dustproof cover that surrounds the outer periphery and the back of the rotary brush is attached to the tip of the electric drill. An asbestos wall grinding apparatus provided with: a peripheral wall of the dustproof cover and a part of a back surface thereof is cut along a tangent line in contact with the outer circumference of the rotating track of the rotating brush It is done.

  Further, in Patent Document 2 described below, a device for removing asbestos provided on a wall surface of a structure, which is a mobile carriage, an articulated arm pivotally provided to the mobile carriage, and the articulated arm A removal head provided at a tip and provided with a removal means for removing the asbestos by being pressed against the wall surface of the building; a recovery unit provided on the moving carriage and recovering asbestos removed by the removal head; An asbestos removal device is disclosed.

The real fair 8-8064 Unexamined-Japanese-Patent No. 11-193643

  However, in the asbestos grinding apparatus of patent document 1 mentioned above, in order to grind asbestos with a brush, there exists a possibility that the shaving residue of asbestos may arise. Moreover, the asbestos removal apparatus of patent document 2 mentioned above is unsuitable for the place which an operator should carry out by hand manually, since the whole apparatus becomes large. Furthermore, in Patent Document 1, a brush for sealing is provided around the rotating brush, and in Patent Document 2, a brush-like brush seal is provided around the removal head, and asbestos removed from wall surfaces etc. However, it is difficult to surely prevent the scattering to the surroundings if a gap is always produced only by using the brush.

  The present invention focuses on the above points, and an object thereof is to provide a highly-sealed grinding apparatus in which dust such as ground grinding dust and asbestos does not scatter around. Another object is to provide a dust collection system that can reliably trap and exhaust dust such as shavings and asbestos by using the grinding apparatus.

  The grinding apparatus according to the present invention has a case body having a disk-like upper surface, an outer wall formed over the entire outer periphery of the upper surface, and a circular inner wall provided on the inner peripheral side at a predetermined distance from the outer wall. And a rotary blade disposed inside the inner wall and grinding the material to be abraded, a drive mechanism provided outside the case main body, driving the rotary blade, and a tip of the inner wall all around. Inner cover means formed over the entire surface, outer cover means formed over the entire circumference on the inner peripheral side of the tip of the outer wall, an inner duct connected to the upper surface of the inner portion of the inner wall and leading to the outside of the case; An outer duct connected to the upper surface of a space formed between the inner wall and the outer wall and connected to the inner duct outside the case, and a dust collection hose connected to the inner duct I assume.

  One of the main modes is characterized in that an inner dust collection port connecting the inner duct and the inner portion of the inner wall is formed along the inner circumference of the inner wall. One of the other modes is characterized in that the inner dust collection port has a width of about half of the radius of the inner portion of the inner wall.

  Still another aspect is characterized in that an outer dust collection port connecting the outer duct and a space formed between the inner wall and the outer wall is formed along the circumferential direction of the space. Do. Furthermore, one of the other embodiments is characterized in that the outer dust collection port is set to have a circumferential length longer than that of the inner dust collection port. In still another mode, the outer dust collection port is formed over the entire width in the radial direction of the space.

  In still another mode, the inner cover and the outer cover are disposed in the order of the first brush body, the elastic body, and the second brush body from the center to the outer periphery of the case main body. It is characterized by According to still another aspect of the present invention, there is provided a plurality of biasing means provided circumferentially spaced apart on the outer peripheral side of the tip of the outer wall, and a caster provided at the tip of the biasing means. The tip of the caster may be disposed to project beyond the tips of the inner cover and the outer cover.

  Still another aspect is characterized in that the rotary blade is removable from the drive shaft. In still another mode, one or more operation handles are provided on the upper surface outside of the case body.

  A dust collection system according to the present invention comprises the grinding device according to any one of the above, a filter unit connected to a hose of the grinding device, and having a first filter for capturing the collected matter recovered from the hose; And a vacuum dust collector having a second filter that is finer in diameter than the first filter that is connected to the part and that captures collected material that has passed through the first filter. .

  One of the main modes is characterized in that the second filter is a HEPA filter. One of the other modes is characterized in that the reduced pressure dust collector doubles as the first filter portion.

  Still another aspect is characterized in that a plurality of grinding devices can be connected to the filter portion via a plurality of hoses. Still another aspect is characterized in that the filter unit and the reduced pressure dust-collecting apparatus include a plurality of casters. The above and other objects, features and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings.

  According to the grinding apparatus of the present invention, it has a disk-like upper surface, an outer wall formed over the entire outer periphery of the upper surface, and a circular inner wall provided on the inner peripheral side at a predetermined distance from the outer wall. A case body, a rotary blade arranged inside the inner wall, for grinding the material to be abraded, a drive mechanism provided outside the case body, for driving the rotary blade, and a tip of the inner wall Inner cover means formed over the entire circumference, outer cover means formed over the entire circumference on the inner peripheral side of the tip of the outer wall, and an inner duct connected to the upper surface of the inner part of the inner wall and leading to the outside of the case An outer duct connected to the upper surface of the space formed between the inner wall and the outer wall and connected to the inner duct outside the case; and a dust collection hose connected to the inner duct. And For this reason, it is possible to significantly prevent dust such as shavings and asbestos when the coating is ground from leaking to the outside of the grinding apparatus.

  Further, according to the dust collection system of the present invention, there is provided a filter unit having the first grinding device, a first filter connected to a hose of the grinding device and capturing collected matter recovered from the hose, and the filter portion And a vacuum dust collector having a second filter that is finer in diameter than the first filter that captures the collected matter that has passed through the first filter. For this reason, even in the case where the coating film containing asbestos is ground, the scraps and dust scraped off by the grinding device can be reliably captured by the two filter parts and can be exhausted in a harmless state.

It is a top view which shows the structure of the grinding device of Example 1 of this invention. It is sectional drawing which shows the structure of the said grinding device. It is a bottom view which shows the case main body of the said grinding apparatus. It is a disassembled perspective view which shows the mode of attachment of the rotary blade of the said grinding apparatus. It is a top view which shows arrangement | positioning of the inner duct of the said grinding apparatus, and an outer duct. It is a schematic diagram which shows the whole structure of the dust collection system of Example 2 of this invention. It is a schematic diagram which shows the whole structure of the dust collection system of Example 3 of this invention.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the structure of the grinding apparatus of this embodiment, FIG. 2 is a cross-sectional view showing the structure of the grinding apparatus, and FIG. 3 is a bottom view showing the case main body of the grinding apparatus. FIG. 4 is an exploded perspective view showing how a rotary blade of the grinding apparatus is attached, and FIG. 5 is a plan view showing the arrangement of the inner and outer ducts of the grinding apparatus. The grinding apparatus 10 of the present embodiment is for grinding a coating film such as a wall surface, and is suitable for grinding when the coating film itself contains asbestos or when asbestos is provided in the lower layer of the coating film. It is a grinding device that has high performance and high dust collection efficiency.

  As shown in FIGS. 1 to 5, the grinding apparatus 10 includes a case main body 12 having a substantially circular flat surface, a rotary blade 40 for grinding a material to be ground such as a coating, and a drive device 30 for driving the rotary blade 40. The inner cover 90 and the outer cover 100 arranged concentrically, the outer duct 72 and the inner duct 82, and a hose 76 for dust collection. In these FIGS. 1 to 5, the arrows displayed around 12 of the case body indicate the rotation direction of the rotary blade 40, and the arrows displayed at the tip of the hose 76 are the suction directions by the vacuum dust collector (not shown) Indicates the (dust collection direction).

  The case body 12 has a disk-shaped upper surface 14, a ring-shaped outer wall 16 formed over the entire outer periphery of the upper surface 12, and a ring-shaped outer peripheral surface formed at a predetermined distance from the outer wall 16. The inner wall 18 of the The outer wall 16 and the inner wall 18 are formed concentrically.

  In a space 20 inside the inner wall 18 of the case main body 12, a rotary blade 140 for grinding a material to be ground such as a coating containing asbestos is disposed. A driving device 30 for rotating the rotary blade 40 is provided outside the top surface 14 of the case 12. The drive device 30 has a motor 32, and a drive shaft 34 of the motor 32 penetrates the upper surface 14 so as to be orthogonal to the upper surface 14, and a tip projects into the space 20. At the tip of the drive shaft 34, a coupling portion 36 for detachably attaching the rotary blade 40 is provided.

  The rotary blade 40 is attached to the coupling portion 36 as shown in FIG. In addition, as shown in FIG. 4, the rotary blade 40 used in the present embodiment is provided with three blades 42 on the outer periphery, and is inclined from the contact surface 40A on the outer periphery side to be in contact with the material to be abraded 44 and the step 46 are formed. An opening 48 is provided at the center of the step 46. Such a configuration of the rotary blade 40 is an example, and can be replaced with blades of other known various structures having similar effects depending on the grinding place and the object to be ground.

  First, the through hole 52 of the wheel washer 50 is inserted into the drive shaft 34 protruding from the coupling portion 36. Next, the rotary blade 40 is stacked so that the contact surface 40A faces upward, and the tip of the drive shaft 34 is exposed from the opening 48. Then, the wheel lock nut 60 is overlapped from the top of the rotary blade 40, and the screw hole 62 of the wheel lock nut 60 is screwed into the screw portion formed on the outer periphery of the tip of the driving shaft 34 that has protruded.

  At this time, a plurality of (approximately four in the illustrated example) substantially circular concave portions 63 are provided on the upper surface of the wheel lock nut 60. Then, using a tool 64 having a plurality (two in the illustrated example) of convex portions 66 formed at the same intervals as the intervals between the concave portions 63, the convex portions 66 are fitted into the concave portions 63 and the tool 64 is turned. By this, the screw hole 62 of the wheel lock nut 60 and the screw portion of the outer periphery of the drive shaft 34 can be screwed together, and the rotary blade 40 can be fixed so as to rotate integrally with the drive shaft 34. When the rotary blade 40 is attached to the coupling portion 36, the rotary blade 40 is fixed so as to slightly protrude from the coupling portion 36.

  Next, the inner cover 90 will be described. The inner cover 90 is provided in a ring shape over the entire circumference at the tip 18 A of the inner wall 18. The inner cover 90 has a three-layer structure in which a brush body 92, an elastic body 96 such as rubber, and a brush body 94 are sequentially arranged from the inner peripheral side. Such an inner cover 90 prevents dust such as shavings and asbestos scraped off by the rotary blade 40 from being scattered to the outside by centrifugal force. In particular, since the elastic body 96 is sandwiched between the brush body 92 and the brush body 94, almost no gap is generated when the rotary blade 40 is pressed against the workpiece, and the sealing performance can be enhanced.

  An inner dust collection port 70 connected to an inner duct 72 leading to the outside of the case body 12 is formed on the upper surface of the space 20 in the inner portion of the inner wall 18. A dust collection hose 76 is connected to the inner duct 72 via a connection portion 74. The hose 76 is connected to a vacuum dust collector (not shown).

  As shown in FIG. 5, the inner dust collection port 70 is formed along the inner periphery of the inner wall 18. Further, the inner dust collection port 70 has a width W1 which is about half the radius of the space 20 of the inner portion of the inner wall 18. Thus, by providing the inner dust collection port 70 widely along the inner periphery of the inner wall 18, dust such as shavings and asbestos scraped by the rotary blade 20 is recovered without substantially leaking from the space 20. be able to.

  Next, the outer cover 100 will be described. The outer cover 100 is provided on the inner peripheral side of the tip 16A of the outer wall 16 in a ring shape all around. The inner cover 100 has a three-layer structure in which a brush body 102, an elastic body 106 such as rubber, and a brush body 104 are sequentially arranged from the inner peripheral side. Such an outer cover 100 is for preventing dust and the like that have come out of the inside of the inner cover 90 into the space 22 by centrifugal force from coming out of the case main body 12.

  As described above, most scraps and dust are recovered from the inner dust collection port 70 by the inner cover 90 and the inner duct 72 provided inside the inner cover 90. However, in the present invention, in order to further enhance the dust collection effect, the inner side An outer cover 100 is also provided outside the cover 90. Since the outer cover 100 also sandwiches the elastic body 106 between the brush body 102 and the brush body 104, almost no gap is generated when the rotary blade 40 is pressed against the object to be cut, and the sealing performance is further enhanced. be able to.

  An outer dust collection port 80 is formed on the upper surface of the space 22 between the inner wall 18 and the outer wall 16 to be connected to an outer duct 82 leading to the outside of the case body 12. The outer duct 82 is connected to the connecting portion 74. That is, the outer duct 82 is connected to the inner duct 72 outside the case body 12.

  As shown in FIG. 5, the outer dust collection port 80 is formed along the circumferential direction of the space 22. In addition, the outer dust collection port 80 has a width W2 that covers the entire width of the space 22 in the radial direction. Further, the outer dust collection port 80 is set to have a circumferential length longer than that of the inner dust collection port 70. Thus, by providing the outer dust collection port 80 which is long in the circumferential direction along the circumferential direction of the space 22 and over the entire width thereof, even if there are scraps or dust that leaks from the space 20 to the space 22. Since the dust can be reliably collected from the outer dust collection port 80, it does not leak to the outside of the case body 12.

  As shown in FIGS. 2 and 3, a plurality of recessed portions 110 are formed circumferentially apart on the outer peripheral side of the tip 16A of the outer wall 16. The recess 110 is provided with biasing means such as a spring 112, and a caster 114 is provided at the tip of the spring 112. The tip of the caster 114 protrudes beyond the tips of the inner cover 90 and the outer cover 100. Therefore, when moving the grinding apparatus 10 while pressing it against the workpiece, the caster 114 enables smooth movement, and the inner brush 90 and the outer brush 100 are cut when the spring 112 is contracted. Since it comes in contact with the body, sealing can be ensured.

  The grinding apparatus 10 as described above is provided with operating handles 120 and 130 on the upper surface 14 of the case 12 as shown in FIGS. 1 and 2. The handle 120 is composed of a pair of support portions 122 and 124 and a grip portion 126 supported thereby. The handle 130 is similarly configured by a pair of support portions 132 and 134 and a grip portion 136 supported thereby. Thus, by providing the pair of handles 120 and 130, the operator can use the handles 120 and 130 to move while holding the grinding apparatus 10 with both hands.

  Next, the operation of this embodiment will be described. The rotary blade 40 is attached to the coupling portion 36 in accordance with the procedure described above. Then, the motor 32 of the drive device 30 is driven, and the pressure reduction by the pressure reduction dust collector (not shown) connected to the hose 76 is started. In that state, the operator holds the handle 120, 130 and presses the grinding apparatus 10 against a coating film such as a wall.

  Then, dust such as shavings and asbestos scraped by the rotary blade 40 is sent from the inner dust collection port 70 to the reduced pressure dust collector (not shown) via the inner duct 72, the connecting part 74 and the hose 76. Also, even if there is shavings or dust that has come out of the inner cover 90 to the outer space 22, a dust collector (not shown) from the outer dust collection port 80 via the outer duct 82, the connection portion 74 and the hose 76. Sent to As described above, the dust collection port is provided in each of the doubled spaces in the case main body 12 and sent to the reduced pressure dust collector, so the sealing property is high and the dust collection efficiency is dramatically improved. Can.

Thus, according to the first embodiment, the following effects can be obtained.
(1) The outer wall 16 is formed over the entire outer periphery of the main body case 12 and a circular inner wall 18 is formed at a predetermined interval on the inner side, and the space 20 inside the inner wall 18 is rotatable by the drive device 30 A rotary blade 40 is provided. Then, the inner cover 90 is provided on the entire circumference of the tip 18A of the inner wall 18, and the outer cover 100 is provided on the inner circumference of the tip 16A of the outer wall 16 over the entire circumference. An outer dust collection port 80 connected to the outer duct 82 is provided on the upper surface of the space 22 between the inner wall 18 and the outer wall 16 to collect dust outside. Thus, by providing a double cover around the rotary blade 40, the sealing performance can be enhanced and the dust collection efficiency can be dramatically increased.

(2) The inner dust collection port 70 is formed along the inner periphery of the inner wall 18, and the width W1 of the inner dust collection port 70 is set to be about half the radius of the inner space 20. It is possible to recover most of the shavings and dust from the
(3) Since the outer dust collection port 80 is formed long along the circumferential direction of the space 22 and is formed over the entire width in the radial direction of the space 22, it is temporarily removed from the inner cover 90. Even if there is dust, it can be reliably recovered from the outer dust collection port 80.

(4) Since the inner cover 90 and the outer cover 100 are arranged in the order of the brush body, the elastic body, and the brush body from the center to the outer periphery of the case body 12, the grinding apparatus 10 is pressed against the work When applied, the inner cover 90 and the outer cover 100 come in close contact with the object to be cut, and the sealing property can be enhanced to prevent scattering of shavings and dust to the outside.
(5) A plurality of springs 112 and casters 114 are provided circumferentially spaced apart on the outer peripheral side of the tip 16 A of the outer wall 16, and the tip of the caster 114 protrudes from the tips of the inner cover 90 and the outer cover 100 It was decided to arrange it. For this reason, it becomes easy to move the grinding apparatus 10 in the state which pressed the grinding apparatus 10 on the to-be-cut body.

(6) Since the rotary blade 40 is detachable with respect to the coupling portion 36, the rotary blade can be replaced and used according to the application.
(7) Since the pair of handles 120 and 130 are provided on the upper surface 14 of the case main body 12, the operator can work while grasping the handles 120 and 130 with both hands. It is possible to press against the scrap and to perform reliable grinding and dust collection.

  Next, a second embodiment of the present invention will be described with reference to FIG. The same or corresponding elements as or to those of the first embodiment described above are designated by the same reference numerals (the same applies to the following embodiments). The dust collection system 200 of the present embodiment utilizes the grinding apparatus 10 of the first embodiment described above. As shown in FIG. 6, the dust collection system 200 of the present embodiment is configured by a plurality of grinding devices 10, a filter unit 210, and a reduced pressure dust collector 230.

  The filter unit 210 has a guard filter 218 (first filter) inside the case 210. The guard filter 218 is for capturing a large portion of the scrap collected from the grinding apparatus 10. A guard cover 214 having a plurality of connection ports 216 is provided on the front surface 212 </ b> A side of the case 212. In the illustrated example, three connection ports 216 are provided, and the grinding device 10 can be connected to each connection port 216 via a hose 76.

  On the other hand, the reduced pressure dust collector 230 is connected to the back surface 212B side of the case 212 via the joint duct 220. By reducing the pressure with the reduced pressure dust collector 230, dust such as scraps and asbestos is collected from the inner duct 72 and the outer duct 82 of the grinding apparatus 10 through the joint duct 220, the filter portion 210 and the hose 76. Can.

  In the reduced-pressure dust collector 230, the joint duct 220 is connected to the front 232A side of the case 232, and a HEPA filter 234 (second filter) is provided at a position near the inner front 232A. The HEPA filter 234 is a so-called high-performance filter that captures dust and the like that has passed through the guard filter 218, and has finer eyes than the guard filter 218. An exhaust duct 236 is connected to the back surface 232 B side of the case 232.

  According to the second embodiment, the collected material recovered from the grinding apparatus 10 is passed through the guard filter 218 to capture large scraps and the like, and then the HEPA filter 234 provided inside the reduced pressure dust collector 230 Since dust and the like are captured, dust can be collected efficiently, and exhaust can be performed in a state where harmful substances such as asbestos are not contained (for example, a state satisfying the emission standard specified by a government ordinance). In addition, since a plurality of grinding devices 10 can be used with one dust collection system 200, work efficiency is good.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. This embodiment is a modification of the dust collection system. In the second embodiment described above, the filter unit 210 and the reduced pressure dust collector 230 are separately configured. However, the dust collection system 300 of the present embodiment integrally includes the filter part and the reduced pressure dust collector. The reduced pressure dust collector 302 has a filter unit 306 on the intake side and a reduced pressure unit 320 on the exhaust side.

  Inside the filter unit 306, a guard filter 312 (first filter) is provided. The guard filter 312 is for capturing a large amount of scraps recovered from the grinding apparatus 10. A guard cover 308 having a plurality of connection ports 310 is provided on the front surface 304 A side of the reduced pressure dust collector 302. In the illustrated example, four connection ports 310 are provided, and the grinding device 10 can be connected to each connection port 310 via a hose 76.

  On the other hand, the decompression unit 320 decompresses and collects scraps and dust through the inner duct 72 and the outer duct 82 of the grinding apparatus 10 through the filter unit 306 and the hose 76 by decompressing. The decompression unit 320 includes a HEPA filter 322 (second filter) on the suction side, that is, on the position from the filter unit 306. The HEPA filter 322 is a so-called high-performance filter that captures dust such as asbestos that has passed through the guard filter 312, and has finer eyes than the guard filter 312. An exhaust duct 324 is connected to the back surface 304 </ b> B side of the reduced pressure dust collector 302.

  Further, in the present embodiment, a plurality of castors 330 are provided on the bottom surface of the reduced pressure dust collector 302. By providing the caster 330, it becomes easy to move on the installation surface 240 even if the reduced pressure dust collector 320 is large. In addition, since the filter portion and the reduced pressure dust collector are integrally configured, the device configuration is simplified. The other basic actions and effects are similar to those of the second embodiment described above.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention. For example, the following are also included.
(1) The shapes and dimensions shown in the above embodiments are merely examples, and may be changed as appropriate.
(2) In the first embodiment, the handles 120 and 130 are provided, but this is also an example, and the handle may be one. Further, the position and the shape of the handle are also an example, and the design can be appropriately changed within the range where the same effect can be obtained.
(3) The number of connected grinding devices 10 shown in the second embodiment and the third embodiment is an example, and the number of connections may be appropriately increased or decreased according to the performance of the reduced pressure dust collector.
(4) In addition to the guard filter and the HEPA filter shown in the second and third embodiments, it does not prevent further provision of another filter.

  According to the present invention, a case body having a disk-shaped upper surface, an outer wall formed over the entire outer periphery of the upper surface, and a circular inner wall provided on the inner peripheral side at a predetermined distance from the outer wall A rotary blade disposed inside the inner wall and grinding the material to be ground, a drive mechanism provided outside the case main body, driving the rotary blade, and a tip of the inner wall all around the circumference The inner cover means formed, the outer cover means formed over the entire circumference on the inner peripheral side of the tip of the outer wall, the inner duct connected to the upper surface of the inner part of the inner wall and leading to the outside of the case, the inner wall And an outer duct connected to the upper surface of the case and connected to the inner duct outside the case, and a dust collection hose connected to the inner duct. As a result, the sealing performance is enhanced, and it is possible to largely prevent the scraps and dust from leaking to the outside when the coating film is ground, so that it can be applied to the use of a grinding apparatus.

  Further, according to the present invention, it is connected to the grinding device, a filter portion connected to the hose of the grinding device and having a first filter for capturing the collected matter recovered from the hose, and connected to the filter portion And a vacuum dust collector having a second filter that is finer in diameter than the first filter for capturing the collected matter that has passed through the first filter. Therefore, dust such as shavings scraped off with a grinder or asbestos can be reliably captured by the two filter parts and can be exhausted in a harmless state, so that it can be applied to the application of the dust collection system. In particular, it is suitable for the use of grinding and dust collection of a coating film containing asbestos.

10: Grinding device 12: Case body 14: Top surface 16: Outer wall 16A: Tip 18: Inner wall 18A: Tip 20, 22: Space 30: Drive device 32: Motor 34: Drive shaft 36: Coupling part 40: Rotary blade 40A: Contact surface 42: blade 44: inclined surface 46: step portion 48: opening 50: wheel washer 52: through hole 60: wheel lock nut 62: screw hole 63: recess 64: tool 66: protrusion 70: inner dust collection opening 72: inner duct 74: connection portion 76: hose 80: outer dust collection port 82: outer duct 90: inner cover 92, 94: brush body 96: elastic body 100: outer cover 102, 104: brush body 106: elastic body 110 : Hole 112: Spring 114: Caster 120, 130: Handle 122, 124, 132, 134: Support part 126, 136: Holding part 200: dust collection system 210: filter part 212: case 212A: front 212B: back 214: cover 216: connection port 218: guard filter 220: joint duct 230: reduced pressure dust collector 232: case 232A: front 232B: back 234: HEPA filter 236: exhaust duct 240: installation surface 300: dust collection system 302: vacuum dust collector 304A: front 304B: back 306: filter part 308: cover 310: connection port 312: guard filter 320: vacuum dust collector 322: HEPA filter 324: Exhaust duct 330: Caster W1, W2: Width

Claims (15)

A case body having a disk-like upper surface, an outer wall formed over the entire outer periphery of the upper surface, and a circular inner wall provided on the inner peripheral side at a predetermined distance from the outer wall;
A rotary blade disposed inside the inner wall and grinding the material to be abraded;
A drive mechanism provided outside the case body for driving the rotary blade;
An inner cover means formed over the entire circumference at the tip of the inner wall;
An outer cover means formed over the entire circumference on the inner peripheral side of the tip of the outer wall;
An inner duct connected to the upper surface of the inner portion of the inner wall and leading to the outside of the case;
An outer duct connected to the upper surface of a space formed between the inner wall and the outer wall and connected to the inner duct outside the case;
A dust collection hose connected to the inner duct;
Grinding device characterized by having.   The grinding apparatus according to claim 1, wherein an inner dust collection port connecting the inner duct and an inner portion of the inner wall is formed along the inner periphery of the inner wall.   The grinding apparatus according to claim 1 or 2, wherein the inner dust collection port has a width about half the radius of the inner portion of the inner wall.   The outer dust collection port which the said outer side duct and the space formed between the said inner wall and the outer wall connect is formed along the circumferential direction of the said space, The any one of the Claims 1-3 characterized by the above-mentioned. Grinding device according to one of the claims.   The grinding apparatus according to any one of claims 1 to 4, wherein the outer dust collection port is set to have a circumferential length longer than that of the inner dust collection port.   The grinding apparatus according to any one of claims 1 to 5, wherein the outer dust collection port is formed over the entire width in the radial direction of the space. The inner cover and the outer cover are
The first brush body, the elastic body, and the second brush body are arranged in this order from the center to the outer periphery of the case main body, according to any one of claims 1 to 6, Grinding device as described. A plurality of biasing means provided circumferentially spaced apart on the outer peripheral side of the tip of the outer wall;
A caster provided at the tip of the biasing means,
As well as
The grinding apparatus according to any one of claims 1 to 7, wherein a tip of the caster is disposed to project beyond a tip of the inner cover and the outer cover.   The grinding apparatus according to any one of claims 1 to 8, wherein the rotary blade is attachable to and detachable from the drive shaft.   The grinding apparatus according to any one of claims 1 to 9, wherein one or more operation handles are provided outside the upper surface of the case body. The grinding apparatus according to any one of claims 1 to 10,
A filter unit connected to a hose of the grinding apparatus and having a first filter for capturing the collected matter recovered from the hose;
A vacuum dust collector having a second filter connected to the filter unit and having a finer mesh than the first filter that captures the collected matter that has passed through the first filter;
The dust collection system characterized by having.   The dust collection system according to claim 11, wherein the second filter is a HEPA filter.   The dust collection system according to claim 11, wherein the reduced pressure dust-collector doubles as the first filter unit.   The dust collection system according to any one of claims 11 to 13, wherein a plurality of grinding devices can be connected to the filter unit via a plurality of hoses.   The dust collection system according to any one of claims 11 to 14, wherein the filter unit and the reduced-pressure dust collector include a plurality of casters.

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