JPH05212676A - Suction device of dust collecting air grinder - Google Patents

Abstract

PURPOSE:To suck dust produced by polishing so efficiently by installing an inflow poty of supply air, being interconnected to a side circumferential space, in a holding pipe and another inflow port of exhaust air being interconnected to another side circumferential space at the lower part of a suction pipe, respectively. CONSTITUTION:Air taken into an air supply passage passes through this passage and fed to a motor case and, after rotating a rotor, it is exhausted to a side circumferential space 25a of a suction pipe at a suction device 12 from an exhaust pipe 14 of the motor case. In succession, air charged to a side circumferential space 24a of a holding pipe 24 at this suction device 12 produces its upward flow by a taper surface 27 of a lower end 26a of an auxiliary suction pipe 26 when passing a clearance 28, while the air exhausted to the side circumferential space 25a of the suction pipe 25 at the suction device 12 draws the air of the auxiliary suction pipe 26 into the suction pipe 25 when it flows into this suction pipe 25 from the space 25a, so that suction force is produced there consequently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction device in a dust suction type air grinder in which dust generated by polishing work is prevented from scattering.

[0002]

2. Description of the Related Art Conventionally, the dust generated by polishing is sucked by a dust suction type air grinder by directly attaching a vacuum tube arranged from a dust suction machine to a dustproof cover of the dust suction type air grinder.

[0003]

However, the environment in which the dust suction type air grinder is used is not always a large room, and may be a narrow room or a closed room. I couldn't do that, and I could only use a small portable dust collector. Therefore, it is not possible to obtain a sufficient suction force only by the suction force of the vacuum tube arranged from such a small portable dust collector, and there is a problem that the dust generated by polishing cannot be sufficiently sucked. It was

Therefore, the suction device of the dust suction type air grinder of the present invention has been made for the purpose of solving the above-mentioned conventional problems.

[0005]

In the suction device for a dust suction type air grinder of the present invention, a holding tube 24 is connected to a dust suction hole 22 provided in a dust cover 20 surrounding the polishing member 17 via a receiving member 23. Then, the suction pipe 25 is connected to the upper portion of the holding pipe 24, and the auxiliary suction pipe 26 having the side circumferential space 24a on the inner surface of the holding pipe 24 and the tapered surface 27 formed on the inner surface of the lower end portion 26a is inserted and attached. Then, the upper end portion 26 of the auxiliary suction pipe 26 is inserted through the side peripheral space 25a of the suction pipe 25.
b is inserted into this suction pipe 25, and the auxiliary suction pipe 26
A gap 28 is provided between the lower end portion 26a of the
Further, the holding pipe 24 is provided with an inlet 29 for supply air communicating with the side peripheral space 24a, and an inlet 30 for exhaust air communicating with the side peripheral space 25a is provided below the suction pipe 25.

[0006]

The dust generated by polishing is attached to the dust-proof cover of the dust-collecting air grinder through the suction device of the dust-collecting air grinder of the present invention to attach the vacuum pipe arranged from the cloth bag / pail can or the dust collector to the dust-proof cover of the dust-collecting air grinder. It is efficiently sucked.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a suction device for a dust suction type air grinder according to the present invention will be described below in detail with reference to the drawings shown as embodiments. 1 to 4 show an air grinder equipped with a suction device for a dust suction type air grinder according to the present invention. The air grinder 1 includes a handle 2,
It is composed of a motor case 3 and a gear case 4.

An air supply port 5 is provided at the end of the handle 2, and an air supply passage 7 is provided inside the handle 2 via a ball valve 6.
And a throttle lever 8 for opening and closing the ball valve 6 are provided. Reference numeral 9 is a safety lever for preventing the throttle lever 8 from malfunctioning. A rotor 11 having a plurality of vanes 10 attached thereto is inserted into the motor case 3, and the upper end of the rotor 11 is pivotally supported on the upper portion of the motor case 3. Further, an air supply pipe 13 for sending a part of the air supply air to the suction device 12 of the present invention is connected to the motor case 3, and
An exhaust pipe 14 for sending exhaust air to the suction device 12 of the present invention is connected.

The gear case 4 is provided with a speed reducing mechanism 15, and a fixing mechanism is provided in the gear case 4 via the speed reducing mechanism 15 at the lower end of the main shaft 16 and at the center of a circular mounting body 18 to which a polishing member 17 is mounted. It connects to the upper end of the shaft 19. Furthermore, at the bottom of the gear case 4,
The dustproof cover 20 is attached, and the circular mount 18 is attached.
The periphery of is surrounded by the dustproof cover 20. Further, a vacuum tube 21 arranged from a cloth bag / pail can or a dust collector (not shown) is connected to the dustproof cover 20 via the suction device 12 of the present invention.

In the suction device 12 of the present invention, as shown in FIG. 5, a holding tube 24 is connected to a dust suction hole 22 provided in the dustproof cover 20 via a receiving member 23, and suction is carried out above the holding tube 24. An auxiliary suction pipe 26, which connects the pipes 25 and has a side circumferential space 24a on the inner surface of the holding pipe 24 and a tapered surface 27 formed on the inner surface of the lower end portion 26a, is inserted. Then, the upper end portion 26b of the auxiliary suction pipe 26 is inserted into the suction pipe 25 through the side peripheral space 25a of the suction pipe 25, and the lower end portion 26a of the auxiliary suction pipe 26 and the receiving member 23 are inserted.
A gap 28 is provided between them. Further, the holding pipe 24 is provided with an inlet 29 for supply air communicating with the side peripheral space 24a, and the intake pipe 13 is connected to the inlet 29. Further, at the lower part of the suction pipe 25, a side peripheral space 25
An exhaust air inlet 30 communicating with a is provided, and the exhaust pipe 14 is connected to the inlet 30.

The circular mounting body 18 is provided with a plurality of dust suction holes 31 in the inner space 17a in the circumferential direction of the circular mounting body 18. A dust collecting blade 32 is provided at the side end of the dust collecting hole 31. Further, the polishing member 17 is a fiber brush containing abrasive grains which is made into a wire by mixing an abrasive with a synthetic resin such as nylon. And
This abrasive-containing fiber brush is attached to the circular attachment 18 with an internal space 17a having a shape as shown in FIGS. The abrasive-containing fiber brush shown in FIGS. 6 and 7 is attached by bristling around the circular attachment body 18, and has the central portion as the internal space 17a. In addition, the abrasive-containing fiber brushes shown in FIGS. 8 and 9 are the same as those shown in FIGS. 6 and 7 except that the notch 33 is provided at each of the lower end portions.
The same as that shown in. Furthermore, FIG. 10 and FIG.
The abrasive-containing fiber brush shown in FIG.
Have a space portion in the center thereof and are scattered in a radial manner, and are planted and attached to this circular attachment body 18.
7a. In addition, 18a is a spread preventing material provided on the upper side circumference of the polishing member 17 as needed.

Next, the operating state of the suction device of the dust suction type air grinder of the present invention constructed as described above will be explained. First, the safety lever 9 is removed and the throttle lever 8 is operated to open the ball valve 6 so that air can flow into the air supply passage 7. Then,
Part of the air flows from the air supply pipe 13 to the side peripheral space 2 of the suction device 12.
4a is supplied. Further, the air flowing into the air supply passage 7 is sent to the motor case 3 through the air supply passage 7.
After rotating the rotor 11, the exhaust gas is exhausted from the exhaust pipe 14 of the motor case 3 to the side peripheral space 25 a of the suction device 12.

The air supplied to the side peripheral space 24a of the suction device 12 passes through the gap 28 as shown in FIG. 5, and the taper surface 2 of the lower end portion 26a of the auxiliary suction pipe 26.
7 causes an upward flow as indicated by an arrow in the figure, and when the air exhausted to the side peripheral space 25a of the suction device 12 flows from the side peripheral space 25a to the suction pipe 25, the auxiliary suction pipe 26 Since this air is drawn into the suction pipe 25, a suction force is generated.

The air sent to the motor case 3 is blown to the vanes 10 and blows the rotor 11 to about 20,0.
Rotate at a high speed of 00 to 21,000 rpm. The high speed rotation of the rotor 11 is about 4,500 via the reduction mechanism 15.
The fixed shaft 19 of the circular mounting body 18 is rotated by reducing the speed to rpm. The polishing member 17 is rotated by the rotation of the fixed shaft 19 which has been decelerated, but the polishing member 17 made of a fiber brush containing abrasive grains has a sufficient polishing action even if the rotation speed is slowed down. It becomes difficult for the fiber brush containing particles to spread in a skirt shape, and the side surface of the polishing member 17 is not ground.

The dust generated by the polishing is collected in the internal space 17a of the polishing member 17, and is sucked from the dust suction hole 31 of the circular mounting body 18 to the vacuum tube 21 through the suction device 12 to make a cloth bag. It is collected in a pail can or a dust collector (not shown). In this case, the dust generated by polishing is more strongly sucked by the dust suction blades 32 provided at the side ends of the dust suction holes 31.

[0016]

The suction device of the dust suction type air grinder according to the present invention is constructed as described above, and the dust pipe of the dust suction type air grinder is provided for the vacuum pipe arranged from the cloth bag / pail can and the dust suction device. Since the dust generated by polishing is efficiently sucked through this suction device, a sufficient suction force can be obtained even when the dust collector is not used.

[Brief description of drawings]

FIG. 1 is a side sectional view of a dust suction type air grinder equipped with a suction device of the present invention.

FIG. 2 is a plan view of a dust suction type air grinder equipped with the suction device of the present invention.

FIG. 3 is a front view of a dust suction type air grinder equipped with the suction device of the present invention.

FIG. 4 is a side view of a dust suction type air grinder equipped with the suction device of the present invention.

FIG. 5 is an enlarged sectional view of the suction device of the dust suction type grinder of the present invention.

FIG. 6 is a cross-sectional view showing an example of a polishing member used in a dust suction type grinder equipped with the suction device of the present invention.

FIG. 7 is a partially omitted bottom view of the polishing member shown in FIG.

FIG. 8 is a half cross-sectional view showing another example of a polishing member used in a dust suction type grinder equipped with the suction device of the present invention.

9 is a partially omitted bottom view of the polishing member shown in FIG. 8. FIG.

FIG. 10 is a half cross-sectional view showing still another example of the polishing member used in the dust suction type grinder equipped with the suction device of the present invention.

11 is a partially omitted bottom view of the polishing member shown in FIG.

[Explanation of symbols]

 17 Polishing Member 20 Dust Cover 22 Dust Collection Hole 23 Receiving Member 24 Holding Tube 24a Side Circumferential Space 25 Suction Tube 25a Side Circumferential Space 26 Auxiliary Suction Tube 26a Lower End 26b Upper End 27 Tapered Surface 28 Gap 29 Inlet 30 Inlet

Front page continued (72) Inventor Hiroki Tatsu, 2-9-18 Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture KANDEN Kogyo Co., Ltd. (72) Inventor Naoki Okada 2-9, Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture No. 18 In Kanden Kogyo Co., Ltd. (72) Inventor Masayuki Deguchi 2-9-18 Honjo Higashi, Kita-ku, Osaka-shi, Osaka No. 18 In Kanden Kogyo Co., Ltd. (72) Inventor Mitsuyasu Matsuo 2-18 Shinmachi, Nishi-ku, Osaka-shi, Osaka No. 1 Limited company Shinei Shoten (72) Inventor Keiji Murai 3-555 Nishiiwata, Higashi-Osaka City, Osaka Prefecture Yokota Industry Co., Ltd.

Claims (1)

[Claims] 1. A holding pipe 24 is connected to a dust suction hole 22 provided in a dust cover 20 surrounding the polishing member 17 via a receiving member 23, and a suction pipe 25 is connected to the upper portion of the holding pipe 24. An auxiliary suction pipe 26 having a side circumferential space 24a on the inner surface of the holding tube 24 and a tapered surface 27 formed on the inner side surface of the lower end portion 26a is inserted and attached, and the side circumferential space 25 of the suction pipe 25 is inserted.
The upper end portion 26b of the auxiliary suction pipe 26 is inserted into the suction pipe 25 via a and the lower end portion 2 of the auxiliary suction pipe 26 is inserted.
6a and a receiving member 23 are provided with a gap 28, the holding pipe 24 is provided with a supply air inlet 29 communicating with the side peripheral space 24a, and the side peripheral space 25a is provided below the suction pipe 25.
A suction device for a dust suction type air grinder, which is provided with an exhaust air inlet 30 communicating with the.