JP2880149B1 - Pneumatic shaving machine with suction function - Google Patents

Abstract

To improve the working environment in a narrow space, the present invention quickly captures dust shaved by a tool when generated, reduces wide-area diffusion, and is simple and inexpensive. It is intended to provide a polishing machine. An air grinder (1) includes a tool (2).
And an air motor (3), and a duct body (5) that opens and surrounds a space (6) around the longitudinal direction of the air motor (3).
A hood (8) surrounding the periphery of the tool (2), an air supply pipe (11) for supplying air to the air grinder (1), and an exhaust port (4) provided to close the tool (2) side. And a reflection ring (16). By inverting the exhaust air from the exhaust port (4) of the air motor (3) backward and moving the air in the space (6) between the duct body (5) and the air motor (3) backward at a high speed, the hood (8) Dust is sucked using the air inside as negative pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaving machine using an air motor for grinding or cutting an object.
In particular, the present invention relates to a device for removing chips (hereinafter referred to as dust) generated by grinding or the like from a work space and collecting the chips.

[0002]

2. Description of the Related Art In a processing operation using a pneumatic shaving machine such as an air grinder, when grinding or cutting an object with a tool, dust generated by rotation or exhaust of the tool is scattered as dust. The working environment is deteriorated in a wide range. Therefore, in general, the pneumatic shaving machine has a structure in which dust is blown off by blowing exhaust air forward so that an operator does not inhale dust. In some cases, a dust collector that is independent of the shaving body is attached to a hood surrounding the tool.

[0003]

However, in a narrow working space such as a drum or a tank having a small opening, if the exhaust gas is blown forward to blow off the dust, the dust is accumulated and filled. was there. In addition, a large dust collector must be used in order to purify the filled accumulated dust, which is disadvantageous in that it is costly. Furthermore, when a separate and independent dust collecting device is attached to the hood, there is a problem that the device becomes too complicated and workability in a narrow space is deteriorated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and quickly captures dust shaved by a tool when it is generated, reduces widespread diffusion, and provides a simple and inexpensive suction function. An object of the present invention is to provide a pneumatic shaving machine.

[0005]

In order to achieve the above object, a pneumatic shaving machine with a suction function according to the present invention according to the first aspect of the present invention includes a tool for shaving an object, a shaft for rotating the tool, and an exhaust. An air motor having a mouth, a duct body that fixedly supports the air motor and surrounds the space by opening a space around the longitudinal direction thereof, and a hood that surrounds the periphery of the tool except for a ground portion thereof and communicates with the space. An air supply pipe having one end coupled to the air motor and the other end extending to the outside of the duct main body, and a reflection ring provided so as to close the tool side of the exhaust port with respect to the space. It is characterized by. Thus, the exhaust of the air motor can be reversely injected backward, and the air in the space can be moved backward at a high speed. For this reason, the air in the hood around the tool becomes a negative pressure, and the air in the peripheral portion including dust scraped off by the tool is sucked backward. Therefore, the working environment in a narrow space is improved by a simple and inexpensive device.

[0006] The shaving machine according to the present invention as set forth in claim 2 is further characterized by further comprising an injection section for injecting air from the vicinity of the exhaust port side of the air motor in a direction opposite to the tool. Thus, the exhaust from the air motor can be further accelerated backward, and the suction force in the hood increases. Therefore, dust is further removed.

[0007] Further, the shaving machine according to the present invention as set forth in claim 3 further comprises a dust collecting device in a direction opposite to the tool of the duct main body and connected to the duct main body. Features. Thus, when the air containing the dust sucked from the hood is discharged into the atmosphere, the dust is captured and collected by the dust collecting device, thereby preventing the dust from spreading over a wide area.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. FIG.
1 shows an air grinder 1 according to an embodiment of a pneumatic shaving machine with a suction function of the present invention. The tool 2 has a flat disk shape and is used for grinding an object, and is made of a material such as a grindstone, a brush, and a paper file. The outer shape of the air motor 3 has a substantially cylindrical shape, and is provided with a shaft protruding from the end 3a at one end in the axial direction.
The tool 2 is removably mounted in a known manner. This is to allow the tool to be replaced according to the application or to be replaced when it is damaged. On the other end side in the axial direction of the air motor 3, an exhaust port 4 for discharging air after driving the air motor is provided around the other end.
In addition, an injection portion 18 for injecting air rearward is provided at an end 3b on the other end side of the air motor, which will be described later in detail. The tool 2 may be a disk-shaped rotary blade that cuts an object. Although the air motor 3 has a cylindrical shape in the present embodiment, the air motor 3 is not limited to this shape, and may be, for example, a rectangular parallelepiped shape.

The duct body 5 has a substantially cylindrical shape, and is configured to not only open and surround the space around the longitudinal direction of the air motor 3 but also to protrude to the rear thereof. Although it has a shape, the diameter of the central portion 5a corresponding to the shape of the reflection ring 16 described later is larger than the diameters of the other portions. The air motor 3 is firmly fixed to the duct main body 5 via a pair of fixtures 7. This pair of fixtures 7
An air passage (not shown) is opened in the thickness direction so as not to hinder the movement of air existing in the space 6. The number of the fixtures 7 is not limited to one pair, and may be one or more as long as the movement of air is not hindered, or may be formed integrally with the duct main body 5. Also, the duct body 5
Has a cylindrical shape in the present embodiment, but can be appropriately changed according to the shape of the air motor 3 housed therein.
Further, the shape may be such that the operator can easily hold it. Further, if the space portion 6 is too wide, the air suction function described later is weakened.

A hood 8 is detachably fixed around one end of the duct main body 5 so as to surround the periphery except for the grinding portion 2a of the tool 2, and the space formed by the hood 8 defines the duct main body. The inner space 5 communicates with the space 6. The hood 8 captures dust generated when the object is scraped off, thereby preventing the dust from floating and diffusing, and also protects the worker from being injured by the rotating tool 2. The other end of the duct body 5 is tapered from the central portion 5a to be tapered, and extends to the cylindrical portion 5b having the minimum diameter. One end of a tubular member 9 having elasticity, for example, a flexible hose or the like is fitted into the cylindrical portion 5b, and the other end is connected to a dust collecting device 10.

At the other end of the air motor 3, an air supply pipe 1 extending to the outside through a central portion 5a of the outer duct body 5 is provided.
1 is connected, and the outer end thereof is connected to the air motor 3.
Is connected to a valve means 12 for controlling air for driving the valve. An elbow 13 and a nipple 14 having a different diameter are provided between the air supply pipe 11 and the valve means 12 to appropriately connect them. This valve means 12, a different diameter nipple 14,
Air is supplied from a compressed air source (not shown) to the air motor 3 via the elbow 13 and the air supply pipe 11.
In this embodiment, the air supply pipe 11 is connected to the air grinder 1.
The valve means 12 is connected to the air supply pipe 11 and is provided on the side of the air grinder 1, and the valve means 12 is connected to a coupler 15 or the like. Alternatively, an air hose from a compressed air source may be connected to supply air. The joint between the air supply pipe 11 and the duct body 5 is sealed by a known appropriate means to prevent air leakage. Furthermore, air supply pipe 1
The position 1 can be appropriately moved further forward or rearward according to the position of the air supply inlet 3c of the air motor 3.

The reflection ring 16 is used to close the tool 2 side of the exhaust port 4 of the air motor 3 in the space 6 between the air motor 3 and the duct body 5, that is, the upstream side of the air flow, that is, from the exhaust port 4. Is mounted around the air motor 3 to direct the exhaust of the air to the rear. As shown in FIG. 2, the reflection ring 16 is inclined so as to spread rearward from the upstream side of the exhaust port 4, and is fixed to the air motor 3 by a front end 16 a and a rear end 16 b. A hole 16c is formed in the rear end 16b so as not to block the flow of air from the exhaust port 4. The reflection ring 16
A seal member 17 such as a gasket or an O-ring is inserted into the mounting portion to the air motor 3 to prevent air leakage. As described above, the central portion 5a of the duct body 5 located on the outside has a shape corresponding to the shape of the reflection ring 16, and the space 6 from one end to the other end of the air motor 3 is formed. The size of the vertical cross section is made substantially uniform along the axial direction. This is to make the flow of air through the space 6 constant, but the size of the vertical cross section of the space 6 may not be uniform as long as the purpose of suction described later is achieved. . Further, in the present embodiment, the reflection ring 16 is attached to the air motor 3;
As long as the exhaust gas from the exhaust port 4 can be directed rearward, the exhaust port 4 may be attached to the duct body 5 or the fixture 7 via a supporting member as appropriate. Further, the fixture 7 itself is provided on the upstream side of the exhaust port 4; By appropriately providing a protruding member downstream from the fixture 7, a function of a reflection ring can be provided.

In the present embodiment, the air grinder 1 according to the present invention moves from the vicinity of the exhaust port 4 side of the air motor 3 to the side opposite to the tool 2 and, in this embodiment, from the end 3b on the other end side.
An injection unit 18 that injects air toward zero is provided. FIG.
As shown in FIG. 5, the injection unit 18 includes an injection nozzle 18a directly attached to the rear end 3b of the air motor 3. The injection nozzle 18a is in communication with the air supply inlet 3c. Therefore, the air passing through one path 30 of the air supply inlet 3c divided into two parts is used as a power source for driving the air motor 3, and The air passing through the passage 31 can be injected backward from the injection nozzle 18a. In the illustrated example, one injection nozzle 18a is provided, but a plurality of injection nozzles 18a may be provided. As shown in FIG. 3, the injection unit 18 is provided with an injection nozzle 18 formed at the tip of a branch pipe 32 branched from the air supply pipe 11.
b. Thereby, the air supply pipe 1
A part of the air flowing through 1 can be injected rearward from the injection nozzle 18b through the branch pipe 32. The branch type injection nozzle 18b can be arranged at an arbitrary position inside the space 6 or the duct main body 5 by appropriately changing the branch pipe 32. Further, the number of the branch injection nozzles is not limited to one, and a plurality of branch injection nozzles may be provided. Furthermore, the air supply pipe 11 may be branched outside the duct main body 5, and a pipe branched from another place may be drawn into the duct main body, and an injection nozzle may be provided there.

Next, the flow of air in the air grinder 1 according to the present invention and the suction and supplementary action of dust will be described. In FIG. 1, air from a compressed air source (not shown) moves in a direction indicated by an airflow F <b> 1, and passes through a valve means 11, a nipple 13 having a different diameter, an elbow 12, and an air supply pipe 10. A part is supplied to the air motor 3. The supplied air is used as a drive source to drive the air motor 3 to rotate the tool 2 to scrape the target. The air used for driving is exhausted from the exhaust port 4, and the air flow f1
Is directed rearward by the reflection ring 16. With the rearward injection of the exhaust gas by the reflection ring 16, an airflow F2 is generated in the space 6 between the air motor 3 and the duct body 5,
The air is pulled backwards at a high speed. As a result, the air in the hood 8 around the tool 2 becomes a negative pressure, and an air flow F2 is generated, and the peripheral air including dust removed by the tool 2 is sucked backward.

Further, an airflow f2 is generated by the injection from the injection unit 18 provided on the rear side of the air motor 3, and the airflow f1 of the exhaust gas from the exhaust port 4 can be further accelerated. Therefore, the pressure in the hood 2 is further reduced, and the suction force is increased. Therefore, it is possible to more effectively remove dust.

On the other hand, the air flow F3 containing dust sucked from the inside of the hood 8 that has passed through the injection unit 18 passes through the tubular member 9 connected to the duct body 5 and the dust collector 10, and is discharged into the atmosphere. Is done. When the air is released into the atmosphere, dust is captured by a filter (not shown) in the dust collector 10, and the dust can be prevented from spreading over a wide area.

[0017]

According to the present invention, the reflection ring is provided so as to close the tool side of the exhaust port of the air motor with respect to the space, so that the exhaust of the air motor can be reversely injected to the rear, so that the air in the space is rearward. Be able to move at high speed. For this reason, the air in the hood around the tool becomes a negative pressure, and the air in the peripheral portion including dust shaved off by the tool is sucked backward. Therefore, the working environment in a narrow space can be improved with a simple and inexpensive device.

Further, by providing an injection section for injecting air from the vicinity of the exhaust port side of the air motor in a direction opposite to the tool, the exhaust from the air motor can be further accelerated backward, and the suction force in the hood can be reduced. Increase. Therefore, it is possible to more effectively remove dust.

Further, by providing a dust collecting device in a direction opposite to the tool of the duct main body and connected to the duct main body, air containing dust sucked from inside the hood is released to the atmosphere. At this time, the dust is collected and collected by the dust collecting device, so that the dust can be prevented from spreading over a wide area. Although an embodiment of the pneumatic shaving machine with a suction function of the present invention has been described using an air grinder, the present invention is not limited to this. Any device can be applied as long as it scrapes off.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of an air grinder according to an embodiment of a pneumatic shaving machine with a suction function of the present invention.

FIG. 2 is a view showing one embodiment of an injection unit provided with an injection nozzle directly attached to an end on the exhaust port side of an air motor.

FIG. 3 is a diagram showing another embodiment of an injection unit provided with an injection nozzle formed by branching a part of an air supply pipe provided around an exhaust port side of an air motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Grinder, 2 ... Tool, 2a ... Grinding part, 3 ...
Air motor, 3a, 3b ... end, 3c ... air supply intake, 4
... Exhaust port, 5 ... Duct main body, 5a ... Central portion, 5b ... Cylinder portion, 6 ... Space portion, 7 ... Fixing device, 8 ... Hood, 9 ... Tube member, 10 ... Dust collector, 11 ... Air supply tube, 12 ... Valve means, 13 ... Elbow, 14 ... Nipple of different diameter, 15 ... Coupler, 16 ... Reflection ring, 17 ... Seal member, 18 ... Injection unit, 18a, 18b ... Injection nozzle, 30 ... One way, 31
... the other road, 32 ... branch pipe, F1, F2, F3, f1, f
2. Airflow.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-155810 (JP, A) JP-A-60-172651 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24B 55/06

Claims (3)

(57) [Claims] 1. A tool for shaving an object, an air motor having a shaft for rotating the tool and an exhaust port, a duct body for fixing and supporting the air motor and surrounding the air motor by opening a space around its longitudinal direction; A hood surrounding the periphery of the tool except for a grinding portion thereof and communicating with the space, an air supply pipe having one end connected to the air motor and the other end extending outside the duct main body, and the tool at the exhaust port A pneumatic shaving machine with a suction function, comprising a reflecting ring provided so as to close the side with respect to the space. 2. The shaving machine according to claim 1, further comprising an injection unit that injects air from around the exhaust port side of the air motor in a direction opposite to the tool. 3. The shaving machine according to claim 1, further comprising a dust collecting device in a direction opposite to the tool of the duct main body and connected to the duct main body.