KR101487279B1 - Grinding Pad and Air Grinder Having It - Google Patents

Abstract

A polishing pad and an air grinder including the polishing pad are disclosed.
The polishing pad according to an embodiment of the present invention includes a polishing disk that is coupled to a driving shaft of an air grinder and rotates and is formed such that a peripheral portion of the polishing disk is inclined upward with respect to a polishing surface, And an abrasive disposed at least in part and rotated together with the polishing disk and abrading the polishing surface in contact with the polishing surface.

Description

Technical Field [0001] The present invention relates to a polishing pad and an air grinder including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing pad and an air grinder including the polishing pad, and more particularly, to a polishing pad including a polishing disk and an abrasive, and an air grinder capable of collecting the same.

The air grinder is used for the polishing work to remove the contamination of the painting or to make the wall, the floor etc. uniform.

A polishing pad of a general air grinder includes a polishing disk 1 and a polishing pad provided under the polishing disk 1 to closely contact the polishing surface 10 to polish the polishing surface 10. The polishing pad 1, And the abrasive 2 are made parallel to the polishing surface 10 in order to widen the contact area with the polishing surface 10 and perform the polishing operation in a shorter time.

The dust generated by the polishing operation is gradually moved to the edge of the polishing pad as the polishing pad rotates, then reaches the end of the polishing pad and is scattered to the outside of the polishing pad. At this time, the angle at which the dust is scattered, (10).

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a polishing disk, an abrasive material and a brush of a conventional air grinder.

1, since the abrasive 2 of a general polishing pad is horizontal with the polishing surface 10, dust due to the polishing operation can also be scattered horizontally with the polishing surface 10 and the abrasive 2 .

On the other hand, a large amount of dust may be generated as the polishing surface 10 and the abrasive 2 wear due to the polishing operation. Recently, an air grinder having a dust collecting function is used to collect the dust.

A general dust collecting air grinder includes a dust collecting cover 3 provided at an upper portion of a polishing pad and a brush 4 provided at a periphery of a lower portion of the dust collecting cover 3.

1 (a) and 1 (b), in order to prevent the dust scattered in the horizontal direction from the polishing surface 10 and the abrasive 2 from scattering to the outside of the area formed by the dust cover 3 and the brush 4, As shown in Fig. 4A.

Therefore, by the movement of the air grinder, the brush 4 and the polishing surface 10 can be frictioned with each other, and the brush 4 can be worn.

The abrasive 2 is worn by the abrasive work so that the brush 4 supports the air grinder against the ground so that the worker presses the air grinder with an increasingly larger force so that the abrasive 2 and the abrasive surface 10 can be brought into close contact with each other. For this reason, workers are reluctant to use the dust cover 3.

FIG. 2 is a view showing a polishing disk of a conventional air grinder, a polishing material, and a brush spaced apart from the polishing surface.

In order to solve the above problems, it is possible to design the brush 4 to have a short length as shown in FIG. 2 so that the end of the brush 4 and the polishing surface 10 are separated from each other. However, dust scattered in a direction parallel to the polishing surface 10 may be scattered in the space between the brush 4 and the polishing surface 10, so that dust may not be trapped.

Prior Art 1: Korean Patent Laid-Open No. 10-2008-0083781 Prior Art 2: Korean Public Practice 20-2008-0005112 Prior Art 3: Korea Registration Office 20-0424371

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned problems, and an object of the present invention is as follows.

First, the present invention provides a polishing pad capable of effectively preventing dust from scattering and effectively sucking dust, and an air grinder including the same.

Second, the present invention aims to provide a polishing pad and an air grinder including the polishing pad, which does not require a worker to press with a larger force even when the thickness of the abrasive is worn.

Third, the present invention is to provide a polishing pad and an air grinder including the polishing pad, which can prevent abrasion of the blocking member due to friction with the polishing surface.

Fourth, the present invention provides a polishing pad capable of polishing a polishing surface adjacent to a wall surface, and an air grinder including the same.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a polishing pad according to an embodiment of the present invention may include a polishing disk and an abrasive.

The polishing disc may be coupled to the driving shaft of the air grinder and rotated, and may be formed to be inclined with respect to the polishing surface as the circumferential portion moves toward the edge.

The abrasive material is disposed on a part of the lower portion of the polishing disc including the peripheral portion, and rotates together with the polishing disc. The abrasive material abuts on the polishing surface to polish the polishing surface along with the rotation.

The central portion of the polishing disc may be spaced apart from the polishing surface. The remaining portion of the polishing disk other than the central portion may be formed to abut the polishing surface.

The polishing disc may be formed of an elastic material.

Further, a thin metal plate may be further provided between the polishing disk and the abrasive.

Meanwhile, an air grinder according to an embodiment of the present invention may include a polishing pad, a driving unit, and a dust collecting unit.

The polishing pad may be configured as described above.

The driving unit may rotate the polishing pad using compressed air.

The dust collecting part can suck and collect dust accompanying polishing of the polishing surface.

The dust collecting part may include a dust collecting cover. The dust collection cover may be formed to have a radius larger than a radius of rotation of the polishing pad and cover the polishing pad at an upper portion of the polishing pad. A dust-collecting hole through which dust generated during polishing may pass may be formed on one side of the dust-collecting cover.

The dust collecting part may include a blocking member. The blocking member may be provided along the periphery of the dust-collecting cover at a lower portion of the dust-collecting cover, and may be spaced apart from the polishing surface.

The dust collecting unit may include an air ejector. The air ejector generates negative pressure by using compressed air supplied from the compressed air chamber, thereby sucking air and dust in the region formed by the dust collecting cover and the blocking member.

The dust collecting unit may further include an air hose for supplying compressed air to the air ejector.

The dust collecting part may include a dust collecting bag. The dust collecting bag may be connected to the air ejector and dust collected through the air ejector may be collected.

The dust-collecting cover may be cut at one side to form a cut-out portion so as to polish a polishing surface close to the wall surface.

The cut-out portion may be rotatably hinged to the dust-collecting cover.

An elastic member may be provided between the cut-out portion and the dust cover main body to provide an elastic force in a direction in which the cut-off portion is normally closed.

The air grinder according to an embodiment of the present invention may further include a switch for simultaneously driving the driving unit and the air ejector.

The air grinder according to an embodiment of the present invention may further include a decompression unit connected to the air discharge port to reduce the pressure of the air discharged from the air discharge port.

The pressure-reducing section may include a pressure-reducing pipe, a pressure-reducing member, and a guide.

A plurality of exhaust holes are formed in the pressure reducing pipe so that air discharged from the air outlet can be moved.

The pressure-reducing member may be provided to surround the pressure-reducing pipe outside the pressure-reducing pipe. In addition, a plurality of holes are formed in the pressure-reducing member, so that the air discharged through the exhaust hole may pass through the pressure-reducing member to reduce the pressure.

The guide may be positioned below the decompression member to guide the air that has passed through the decompression member upward.

The effects of the present invention will be described below.

First, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, the periphery of the polishing disk and the abrasive is inclined upward toward the polishing surface as the edge is gradually moved toward the edge so that the dust due to polishing is scattered upward, The dusts blocked by the blocking member can prevent the dust from being scattered to the outside of the dust collection cover.

Secondly, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, even when the thickness of the abrasive material is changed by separating the blocking member from the polishing surface, the end of the blocking member does not contact the polishing surface, There is an advantage that it is not necessary to pressurize with force.

Thirdly, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, since the blocking member is spaced apart from the polishing surface and the inside of the dust collecting cover and the space are not blocked from the outside by the blocking member, External air can be introduced into the dust-collecting cover due to the negative pressure, so that the dust can be effectively sucked.

Fourth, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, the blocking member is spaced apart from the polishing surface to prevent the barrier member from being worn together by friction with the polishing surface have.

Fifth, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, one side of the dust collection cover is cut to polish the polishing surface adjacent to the wall surface.

Sixth, according to the polishing pad and the air grinder including the polishing pad according to an embodiment of the present invention, the polishing pad of the switch is made of a material having elasticity so that the polishing pad is brought into close contact with the polishing surface even when the operator does not press the air grinder with a great force .

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

The foregoing summary, as well as the detailed description of the preferred embodiments of the present application set forth below, may be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown preferred embodiments in the figures. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
Brief Description of the Drawings Fig. 1 is a view showing a polishing disk, an abrasive and a brush of a conventional air grinder; Fig.
2 is a view showing a polishing disc and a brush of a conventional air grinder and a brush spaced apart from the polishing surface and the polishing surface;
3 is a cross-sectional view of a polishing pad according to one embodiment of the present invention;
4 is a view illustrating a dust collecting operation of an air handler equipped with a polishing pad according to an embodiment of the present invention;
5 is a view illustrating a dust collecting part of an air grinder equipped with a polishing pad according to an embodiment of the present invention;
6 is a view showing scattering of dust according to operation of an air grinder equipped with a polishing pad according to an embodiment of the present invention;
FIG. 7 illustrates a block member of an air grinder provided with a polishing pad according to an embodiment of the present invention; FIG.
8 is a plan view of an air grinder equipped with a polishing pad according to an embodiment of the present invention;
9 is a view showing a state in which an air grinder provided with a polishing pad according to an embodiment of the present invention polishes a polishing surface adjacent to a wall surface; And
FIG. 10 is a view showing a depressurizing unit provided in an air grinder provided with a polishing pad according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In describing the embodiments of the present invention, it is to be noted that elements having the same function are denoted by the same names and numerals, but are substantially not identical to elements of the prior art.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

3 is a cross-sectional view of a polishing pad according to an embodiment of the present invention.

Hereinafter, a polishing pad 100 according to an embodiment of the present invention will be described with reference to FIG.

The polishing pad 100 according to an embodiment of the present invention may include a polishing disk 110 and an abrasive 120.

The polishing disc 110 may be coupled to the driving shaft of the air grinder and rotated, and may be formed so as to be inclined upward with respect to the polishing surface 10 where the peripheral portion 112 is moved toward the edge.

The abrasive member 120 is disposed on a part including the peripheral portion 112 of the lower portion of the polishing disc 110 and rotates together with the polishing disc 110 and abuts against the polishing surface 10 to be polished ) Can be polished.

Therefore, the dust generated as the polishing surface 10 is polished moves to the end of the polishing disk 110 according to the rotation of the polishing disk 110, and the angle between the edge of the polishing disk 110 and the polishing surface 10 The direction in which dust is scattered can be determined.

1 and 2, a conventional polishing pad of an air grinder is provided at a lower portion of a polishing disc 1 and a polishing disc 1 to be in close contact with a polishing surface 10 to polish the polishing surface 10 The polishing disc 1 and the abrasive 2 are arranged horizontally with the polishing surface 10 in order to widen the contact area with the polishing surface 10 and perform the polishing operation in a shorter time.

Since the abrasive 2 of the conventional polishing pad is also horizontal with the peripheral portion 112 and also with the polishing surface 10, dust due to the polishing operation can also be scattered horizontally with the polishing surface 10 and the abrasive 2 1 and 2).

The dust generated as the polishing surface 10 is polished moves to the peripheral portion 112 of the abrasive material 120 as the abrasive material 120 rotates and the abrasive disc 110 and the abrasive material 120 Since the peripheral portion 112 of the polishing surface 10 forms a predetermined angle with the polishing surface 10, the dust due to polishing of the polishing surface 10 is not parallel to the polishing surface 10, And can be scattered upward.

The central portion of the polishing disk 110 may be spaced apart from the polishing surface 10. [ A portion of the polishing disk 110 other than the central portion thereof may be formed to abut the polishing surface 10.

The polishing disc 110 may be formed of an elastic material.

Further, a thin metal plate 130 may be further provided between the polishing disk 110 and the abrasive 120.

A diamond abrasive may be applied to the abrasive 120 of the embodiment of the present invention, and a diamond abrasive may be fused to the lower portion of the thin metal plate 130 by heat treatment or the like. Since the diamond material is applied to the abrasive material 120, wear of the abrasive material 120 is less than that of a conventional abrasive or paper abrasive material, and the replacement frequency of the abrasive material 120 can be reduced.

In one embodiment of the present invention, the polishing disc 110 is formed of a rubber material.

The center portion of the abrasive disc 110 made of rubber is spaced apart from the polishing surface 10 and a part of the polishing disc 110 is abutted against the polishing surface 10 and the abrasive disc 120 is provided under the polishing disc 110, The polishing disc 110 may be slightly deformed by the elasticity of the polishing disc 110 as the operator presses the air grinder. Therefore, the polishing operation can be performed more easily since the abrasive 120 is in close contact with the polishing surface 10 without applying a large force.

The thin metal plate 130 is added between the polishing disc 110 and the abrasive 120 to provide rigidity and elasticity to the polishing disc 110 made of a rubber material.

Although the metal thin plate 130 is provided only between the polishing disk 110 and the abrasive material 120 in the present embodiment, the metal thin plate 130 is also provided on the polishing disk 110, The polishing disc 110 may be positioned between the polishing pad 110 and the polishing pad 110.

4 is a view illustrating a dust collecting operation of an air handler equipped with a polishing pad according to an embodiment of the present invention.

Hereinafter, an air grinder including a polishing pad according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, the air grinder including the polishing pad 100 configured as described above may include a driving unit 200 and a dust collecting unit 300.

The driving unit 200 can rotate the polishing pad 100 using compressed air supplied from the compressed air chamber 210.

For example, the driving unit 200 of the air grinder may include an air motor 220 driven by compressed air. The driving unit 200 includes a first bevel gear (not shown) connected to the air motor 220 and rotated together with the air motor 220, and a second bevel gear And a second bevel gear (not shown) that rotates in engagement with the first bevel gear (not shown). The driving unit 200 may further include a rotation unit 230 connected to a rotation axis of the second bevel gear (not shown) and rotated together with the rotation of the second bevel gear (not shown).

The configuration of the first bevel gear (not shown) and the second bevel gear (not shown) are not shown in the drawings, but will be apparent to those skilled in the art, so a detailed description thereof will be omitted.

The polishing pad 100 may be attached to the rotating portion 230 and may rotate about the same rotating axis as the rotating portion 230 and polish the polishing surface 10 according to the rotation of the rotating portion 230.

However, the configuration of the driving unit 200 is merely an example, and the configuration of the driving unit 200 can be achieved in any way if the polishing pad 100 is configured to rotate.

5 is a view illustrating a dust collecting part of an air grinder equipped with a polishing pad according to an embodiment of the present invention.

5, the dust collecting unit 300 may include a dust collecting cover 310, a blocking member 320, an air ejector 330, and a dust collecting bag 340.

The dust collection cover 310 may be formed to cover the polishing pad 100 at an upper portion of the polishing pad 100, the radius of which is greater than the radius of rotation of the polishing pad 100. A dust collecting hole 311 through which dust generated during polishing may pass may be formed on one side of the dust collecting cover 310.

The blocking member 320 may be provided below the dust cover 310 so as to extend toward the polishing surface along the circumference of the dust cover 310. At this time, the blocking member 320 may be provided to be spaced apart from the polishing surface 10.

In this embodiment, the blocking member 320 is a brush 320, for example.

The brush 4 of the conventional air grinder for dust collection has a problem that the dust scattered in the horizontal direction with respect to the polishing surface 10 and the abrasive 2 is scattered to the outside of the region formed by the dust cover 3 and the brush 4 And is formed to have a length that can be brought into close contact with the polishing surface 10 as shown in Fig.

According to the conventional air grinder for dust collection, although the thickness of the abrasive material 2 becomes thinner due to abrasion of the abrasive material 2 due to the grinding operation, the speed at which the brush 4 wears is smaller than the speed at which the abrasive material 2 is worn It is relatively slow. The abrasive 2 and the abrasive face 10 are spaced apart from each other by the brush 4 as the abrasive material 2 is worn away so that the worker must press the air grinder with an increasingly larger force so that the abrasive 2 and the abrasive face 10 can be brought into close contact with each other.

6 is a view showing scattering of dust according to operation of an air grinder equipped with a polishing pad according to an embodiment of the present invention.

6, the blocking member 320 and the polishing surface 10 of the embodiment of the present invention are spaced apart from each other, so that the blocking member 320 and the polishing surface 10 ) Are not in contact with each other, the operator does not have to pressurize the air grinder with an increasingly large force.

The brush 320 of the embodiment of the present invention is spaced apart from the polishing surface 10 and the peripheral portion 112 of the polishing disc 110 is formed to have a predetermined angle with the polishing surface 10 Accordingly, the dust scattered toward the upper side at a predetermined angle with the polishing surface 10 can be prevented from scattering to the outside of the dust cover 310 by the brush 320.

For this, the brush 320 may be spaced apart from the polishing surface 10 by a distance corresponding to the height of the end of the polishing disk 110. The brush 320 of this embodiment may be spaced from the polishing surface 10 by about 0 to 4 mm, and suitably about 1 to 2 mm.

However, the distance that the brush 320 is spaced apart from the polishing surface 10 is not limited to the above-described numerical values and may vary depending on the angle formed between the peripheral portion 112 of the polishing disk 110 and the polishing surface 10 .

Accordingly, the brush 320 of the present embodiment is separated from the polishing surface 10 by a predetermined distance, but scattered dust is intercepted by the brush 320 and can be positioned within the area formed by the dust cover 310 and the brush 320 have. The dust located in the area between the dust cover 310 and the brush 320 can be sucked into the air ejector 330 by the negative pressure generated by the air ejector 330 to be described later. The air inside the region formed by the dust cover 310 and the brush 320 is sucked into the dust collecting hole 311 by the negative pressure and the outside air flows into the space between the brush 320 and the polishing surface 10 It is possible to prevent the dust from being scattered into the space between the brush 320 and the polishing surface 10.

1, the brush 4 of the conventional air grinder for dust collection is formed to have a length that can be in close contact with the polishing surface 10, whereby the brush 4 and the grinding The surfaces 10 may rub against each other and the brush 4 may be worn.

6, since the brush 320 of the embodiment of the present invention is spaced apart from the polishing surface 10, the brush 320 may be separated from the polishing surface 10 by friction between the brush 320 and the polishing surface 10, The abrasion can be prevented.

7 is a view illustrating a blocking member of an air grinder provided with a polishing pad according to an embodiment of the present invention.

As shown in FIG. 7, a molding 322 formed of synthetic resin may be provided on the brush 320 for combining the brush 320 and the dust cover 310. In addition, an insertion groove into which the molding 322 can be inserted may be formed in the periphery of the dust cover 310.

In addition, the brush 320 can be closely arranged on the molding 322 so that no dust or air leaks through the brushes 320.

In the present embodiment, the blocking member 320 is a brush 320, but the present invention is not limited thereto. The dust may be scattered outside the dust cover 310, such as a skirt made of a rubber material or a blocking film made of a vinyl material Anything that can block something can be applied in a variety of ways.

The air ejector 330 is disposed to communicate with the dust collecting hole 311 and generates negative pressure using the compressed air supplied from the compressed air chamber 210 so that the inside of the area formed by the dust collecting cover 310 and the blocking member 320 It is possible to suck air and dust in the air.

An air hose 350 (see FIG. 8) may be further provided between the compressed air chamber 210 and the air ejector 330 to supply the compressed air in the compressed air chamber 210 to the air ejector 330.

A spacer 336 may be provided between the air ejector 330 and the dust collecting hole 311.

Although not shown in detail in the drawing, a nozzle and a diffuser may be formed inside the air ejector 330. Accordingly, the air ejector 330 sucks high-pressure compressed air, which has moved from the compressed air chamber 210 along the air hose 350, through the suction port 332 and flows the compressed air through the suction port 332 at a high speed to increase the flow velocity. The air is sucked in the area formed by the dust cover 310 and the brush 320 by the negative pressure generated by the dust cover 310 and then the pressure is recovered from the diffuser and discharged to the discharge port 334 to serve as a kind of vacuum pump.

A process in which dust is sucked by the air ejector 330 of the present embodiment will now be described.

Pressure compressed air supplied from the compressed air chamber 210 through the suction port 332 of the air ejector 330 flows into the nozzles and the compressed air having passed through the nozzles lowers the hydraulic pressure and can increase the flow rate. Accordingly, an instantaneous negative pressure may be generated at the rear end of the nozzle, and the air and dust inside the region formed by the dust cover 310 and the blocking member 320 can be sucked by the generated negative pressure.

The pressurized compressed air and the inhaled air are combined with each other and can be compressed to atmospheric pressure while being discharged through the discharge port 334 while flowing the diffuser.

The dust collecting bag 340 may be provided at one side of the air ejector 330 to collect dust that has passed through the air ejector 330. More specifically, the dust collecting bag 340 may be provided at the discharge port 334 of the air ejector 330.

FIG. 8 is a plan view of an air grinder provided with a polishing pad according to an embodiment of the present invention, FIG. 9 is a view showing an air grinder equipped with a polishing pad according to an embodiment of the present invention grinding a polishing surface adjacent to a wall surface Fig.

As shown in FIG. 8, the dust cover 310 may be cut at one side to form the cutout 312 so as to polish the polishing surface 10 adjacent to the wall surface 20. The cutout 312 may be hinged to the dust cover 310 by a hinge 313 so as to be rotatable.

9, when the polishing surface 10 adjacent to the wall surface 20 is polished, the cut surface can be brought into close contact with the wall surface 20 after the cut portion 312 is tilted upward.

For this, the shortest distance from the center of rotation of the polishing pad 100 to the cut surface of the dust cover 310 may be formed to have the same length as the length of the radius of rotation of the polishing pad 100. When the operator presses the air grinder at the time of polishing the polishing surface 10, the turning radius of the polishing pad 100 may slightly increase due to the elasticity of the polishing disk 110. Accordingly, when the polishing surface 10 adjacent to the wall surface 20 is polished, the cut surface is slightly spaced from the wall surface 20 so that the dust is scattered to the outside while performing the polishing operation without friction between the cut surface and the wall surface 20 Can be prevented.

Although the shortest distance from the center of rotation of the polishing pad 100 to the cut surface of the dust cover 310 has a length equal to the length of the radius of rotation of the polishing pad 100 in the present embodiment, And since the polishing disk 110 has elasticity, some error can be tolerated.

An elastic member 314 may be provided at a portion where the cutout 312 is hinged to provide an elastic force in a direction in which the cutout 312 is normally closed.

Therefore, when the grinding operation of the polishing surface 10 adjacent to the wall surface 20 is completed and the air grinder is moved to another position, the cut portion 312 is closed by itself. Therefore, the operation of the air grinder is stopped, The trouble of operating the air grinder again can be solved.

Further, by forming the cut-out portion 312 by cutting one side of the dust cover 310, it is possible to obtain an additional effect of facilitating the assembly and replacement of the cut-off member.

8 of the present embodiment, a hinge 313 is provided between the cutout 312 and the main body of the dust cover 310 so that the hinge 313 is rotatably hinged to each other and a torsion spring as an elastic member 314 is applied to the hinge 313 As shown in Fig.

However, the connection between the cutout 312 and the main body of the dust cover 310 is not limited to that described above, and the connection structure between the cutout 312 and the dust cover 310 may be various.

For example, the incision portion 312 and the dust cover 310 may be connected to each other through a connection portion made of a material having elasticity and compressibility such as rubber. When the incision part 312 is tilted, the connection parts are pressed while being in contact with each other, and the grinding operation of the polishing surface 10 adjacent to the wall surface 20 is completed. When the air grinder is moved, the elasticity and the restoring force The cutout 312 may be configured to close again.

The air grinder according to an embodiment of the present invention may further include a switch 400 for simultaneously driving the driving unit 200 and the air ejector 330. The switch 400 is operated by a valve (not shown) or a compressed air chamber 210 provided in a hose (not shown) for supplying air to the compressed air chamber 210 and compressed air The driving unit 200 and the air ejector 330 can be driven by operating a valve (not shown) for selectively supplying the air.

On the other hand, dust accumulated around the work space can be scattered by the air discharged through the air outlet 240 after being used for driving the air grinder. Therefore, equipment and the like around the work space may be contaminated, and in particular, electric devices may be severely affected.

FIG. 10 is a view showing a depressurizing unit provided in an air grinder provided with a polishing pad according to an embodiment of the present invention.

In order to solve the above-mentioned problems, the air grinder according to the embodiment of the present invention is connected to the air outlet 240 as shown in FIG. 10, so that the pressure of the air discharged from the air outlet 240 is reduced (500).

As a result, the air discharged from the air outlet 240 passes through the decompression unit 500, and the pressure is reduced to prevent dust scattering.

The depressurization portion 500 may include a pressure reducing pipe 510, a depressurizing member 520, and a guide 530.

A plurality of exhaust holes are formed in the pressure reducing pipe 510 so that air discharged from the air outlet 240 can be moved. The pressure-reducing member 520 may be provided to surround the pressure-reducing pipe 510 from the outside of the pressure-reducing pipe 510. A plurality of air holes are formed in the pressure-reducing member 520, so that the air discharged through the exhaust holes may pass through the pressure-reducing member 520, thereby reducing the pressure. The guide 530 may be positioned below the decompression member 520 to guide the air having passed through the decompression member 520 upward.

Pressure air that has passed through the pressure-reducing pipe 510 and the pressure-reducing member 520 is guided to the upper side of the polishing surface by the guide 530, scattering of dust can be more reliably prevented.

Also, since the resistance to the flow of exhaust gas is increased by the pressure reducing pipe 510 and the pressure reducing member 520, the noise generated by the driving of the air motor is reduced, so that the pressure reducing effect and the noise reducing effect of the exhaust gas can be expected.

Hereinafter, the operation of the air grinder according to one embodiment of the present invention will be described with reference to FIGS. 4, 6, and 9. FIG.

When the switch 400 is turned on, compressed air can be simultaneously supplied from the compressed air chamber 210 to the driving unit 200 and the air ejector 330.

The air motor 220 that has been supplied with the compressed air rotates by a pneumatic pressure and rotates a first bevel gear (not shown) connected to the rotation shaft of the motor 220 and rotates a second bevel gear (not shown) The gear (not shown) can rotate according to the rotation of the first bevel gear (not shown). At this time, the rotation axes of the first bevel gear (not shown) and the second bevel gear (not shown) may be perpendicular to each other. The rotating part 230 rotates together with the second bevel gear and the polishing pad 100 is coupled to the rotating part 230 so that the polishing pad 100 rotates according to the rotation of the rotating part 230, The surface 10 can be polished.

At this time, the polishing disk 110 is made of a material having elasticity, and a thin metal plate 130 is provided between the polishing disk 110 and the abrasive 120 to add elasticity and rigidity to the polishing disk 110, Even when the air grinder is pressed with a small force, the abrasive 120 and the polishing surface 10 can be easily adhered to each other, thereby facilitating the polishing operation.

When polishing the general polishing surface 10 and polishing the polishing surface 10 adjacent to the wall surface 20, the cutting portion 312 is turned so that the cutting surface and the wall surface 20 are adjacent to each other, . When the grinding operation of the polishing surface 10 adjacent to the wall surface 20 is completed and the air grinder is moved away from the wall surface 20, the elastic member 314 provided on the hinge 313 of the cut- The cutting section 312 is closed by itself, so that the polishing operation can be continued without stopping the operation.

As the abrasive face 10 is polished, the abrasive 120 and the abrasive face 10 may be worn by friction and dust may be generated. The dust forms a predetermined angle with respect to the polishing surface 10 at the central portion and moves to the peripheral portion 112 inclined upward toward the edge to be scattered in the direction toward the upper surface with respect to the polishing surface 10.

The dust scattered upward toward the polishing surface 10 may be intercepted by the brush 320 and be located within the region formed by the dust cover 310 and the brush 320. When the compressed air supplied to the air ejector 330 forms an instantaneous negative pressure while passing through the nozzles in the air ejector 330, air in the region formed by the dust cover 310 and the brush 320 The dust can be sucked into the air ejector 330.

The dust mixed with the compressed air passing through the nozzle in the air ejector 330 may be compressed again to the atmospheric pressure and discharged to the dust collecting bag 340 while passing through the diffuser provided in the air ejector 330.

Thereby, the dust due to polishing can be collected in the dust collecting bag 340.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. . Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

1: Abrasive disc 2: Abrasive material
3: dust cover 4: brush
10: polishing surface 20: wall surface
100: Polishing pad 110: Polishing disk
112: circumference 120: abrasive
130: metal thin plate 200:
210: Compressed air chamber 220: Air motor
230: rotating part 240: air outlet
300: dust collecting part 310: dust collecting cover
311: dust collecting hole 312:
313: Hinges 314: Elastic member
320: blocking member 322: molding
330: Air ejector 332: Suction port
334: Outlet 336: Spacer
340: house dust bag 350: air hose
400: switch 500:
510: Pressure reducing pipe 520: Pressure reducing material
530: Guide

Claims (9)

A grinding disk coupled to the drive shaft of the air grinder and rotated so as to be inclined upward with respect to the grinding surface as the periphery thereof goes to the edge; And
And an abrasive pad disposed on a part of the lower portion of the polishing disc, the abrasive pad being rotated together with the polishing disc and abrading the polishing surface to polish the polishing surface in accordance with rotation of the polishing disc In addition,
Further comprising a driving part for rotating the polishing pad using compressed air, and a dust collecting part for sucking and collecting dust due to polishing of the polishing surface,
The dust collecting part may include a dust collecting cover having a radius larger than a radius of rotation of the polishing pad and covering the polishing pad at an upper portion of the polishing pad and a dust collecting hole formed at one side thereof for sucking dust generated during polishing and,
The dust collecting cover is cut at one side so as to polish a polishing surface close to a wall surface to form a cut portion, the cut portion being rotatably hinged to the dust cover,
And an elastic member provided between the cut-out portion and the main body of the dust-collecting cover to provide an elastic force in a direction in which the cut-off portion is normally closed. The method according to claim 1,
The polishing disc is formed of a material having elasticity,
A center portion of the polishing disc is spaced apart from the polishing surface,
And the other part of the polishing disk except for the central part is formed so as to abut on the polishing surface. 3. The method of claim 2,
And a thin metal plate is further provided between the polishing disc and the abrasive. delete delete The method according to claim 1,
Wherein the dust collecting portion includes a blocking member disposed along a circumference of the dust collection cover at a lower portion of the dust collection cover and spaced apart from the polishing surface. The method according to claim 1,
Wherein the dust-
An air ejector arranged to communicate with the dust collection hole and sucking air and dust located under the dust collection cover by generating negative pressure using compressed air;
An air hose for supplying compressed air to the air ejector; And
And a dust collecting bag provided at one side of the air ejector and collecting dust that has passed through the air ejector. delete The method according to claim 1,
And a decompression unit connected to the air outlet for reducing the pressure of the air discharged from the air outlet,
The pressure-
A pressure reducing pipe in which a plurality of exhaust holes are formed and air discharged from the air outlet moves;
A pressure reducing member provided to surround the pressure reducing pipe at an outer side of the pressure reducing pipe and having a plurality of pores formed therein to reduce a pressure of air exhausted through the exhaust hole; And
A guide positioned below the decompression member to guide the air having passed through the decompression member upward; And an air grinder.

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