JPH10166351A - Apparatus for removing cut powder of core drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the remaining of a cut powder on the inner peripheral surface and bottom side of a tool even after work and to enhance workability by providing a longitudinally freely extensible tank in a drilling tool and providing the freely extensible small diameter cut powder discharge hose piercing through the tank. SOLUTION: An adaptor 3 becoming a discharge port is provided between a rotary tool 1 and the almost columnar core drill (drilling tool) 2 attached to the rotary tool 1 and dust is sucked by a dust collector 4. The core drill 2 has a tank 5 composed of a freely extensible bellows part 5a and the cut powder discharge hose having small diameter freely extensible bellows 6a piercing through the tank 5 built therein and a smooth plate 9 having a plurality of projections provided thereto is provided to the under surface of the tank 5. The cut powder discharge hose 6 large in caliber but small in diameter of the core drill 2 is constant in diameter and the vol. of the space between the upper surface of concrete and the smooth plate 9 is constant by the projections 8 and, therefore, stable dust collection becomes possible even in all drilling depths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing chips from a core drill provided with a dust collector in drilling a concrete material or the like.

[0002]

2. Description of the Related Art Conventionally, various types of core drills for drilling concrete materials and the like have been developed and marketed, and these core drills are drilled by a wet type or a dry type according to the working environment. By the way, in dry drilling, there are many methods in which chips are generally discharged to the core outer diameter side,
The chips generated at that time are scattered around the work and in the air, causing problems such as an effect on the human body and troublesome cleaning after the work. Therefore, a method using a dust collector at the time of work to prevent scattering of chips around the work site has been desired and proposed. Usually, this dust collection method has two types of discharge means, one from the outer diameter side of the core and one from the inner diameter side. In the case of the core outer diameter side, since chips are discharged from the gap between the core and the work material, a ring-shaped pad is installed at that position, and dust is collected by connecting the pad and a dust collection hose. On the core inner diameter side, an adapter for connecting a dust collection hose is provided between the core drill and the rotary tool. Comparing the dust collection properties of both, the core inner diameter side is better because the degree of sealing is higher than the outer diameter side.

[0003]

However, in a large-diameter core drill having a system for sucking dust from the inner diameter side of the core, the flow of chips is discharged along the inner peripheral surface of the core. Since the chips are attached to the surface and the bottom surface, and the time and effort for cleaning the chips are required, there is a problem that workability is poor.

[0004] It is an object of the present invention to solve the above-mentioned problems and to provide a chip removing device for a core drill provided with a dust collector in which chips do not remain in the core after work.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a core drill using a system for sucking chips during cutting through a core by connecting a substantially cylindrical large diameter core drill attached to a rotary tool and a dust collector. Is achieved by providing a tank that can be extended and contracted in the longitudinal direction provided inside the drilling tool, and a small-diameter chip discharge hose that can be extended and contracted and penetrates the inside of the tank.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a chip removing device according to the present invention will be described with reference to FIGS. A chip removing device provided with an adapter 3 serving as a discharge port between the rotary tool 1 and the core drill 2 and having a mechanism for sucking dust by a dust collector 4 penetrates the tank 5 which is extendable and retractable into the core drill 2. A small diameter telescopic chip discharge hose 6 is built in, rubber rings 7 are fixed to the outer peripheral surface of the upper and lower surfaces of the tank 5, a plurality of projections 8 are provided on the lower surface of the tank 5, and a smooth plate 9 is used on the lower surface of the tank 5. Configure. Hereinafter, each component will be described.
The tank 5 is made of a thin plastic material, has a cylindrical shape with both ends on the bottom, and has a bellows portion 5a whose outer peripheral portion in the longitudinal direction is stretchable in the longitudinal direction. The chip removing hose 6 in the tank 5 is made of a bellows 6a having the same elasticity as the tank 5 and made of a material that is not deformed by internal pressure, and is integrated with the tank 5. The rubber ring 7 is in contact with the inner peripheral surface of the core without any gap. It is made of a material that does not deform sometimes due to compressive force.

Next, a comparison between the chip removing device according to the present invention and the conventional chip removing device shows that the flow of the chips 10 in the core drill 2 at the time of the conventional drilling is related to the diameter of the core drill 2. Most of the core drill 2 advances along the inner circumferential surface, but as the core drill 2 becomes larger in diameter, the volume in the core increases and the dust absorbing power in the core decreases. Therefore, in the large-diameter core drill 2, when the drilling depth becomes shallower than the maximum drilling depth, the amount of chips adhering to the inner circumferential surface of the core tends to increase. On the other hand, according to the present invention, even in a large diameter core drill, the diameter of the small chip removing hose 6 which is small is constant, and the volume of the space between the concrete upper surface and the smooth plate 9 is the protrusion 8.
Therefore, the dust collection is stable at all drilling depths.

A test evaluation of the dust collection performance of the present invention will be described with reference to FIG. The test evaluation was performed using a core drill having a diameter of 65 mm and an effective depth of 150 mm.
mm, 75mm, 100mm, 125mm, 150mm
The weight of chips attached to the core after the end of the hour was measured. As a result, in the present invention, there was almost no weight of the chips attached to the core. On the other hand, in the conventional method, as the drilling depth becomes longer, the weight of the chips tends to increase. Thereafter, since the concrete works to push the chips attached to the core, the weight of the chips is reduced. Therefore, it is possible to stably collect the chips 10 in the core drill 2 having various diameters, and to provide a chip removing device excellent in workability and hygiene.

[0009]

According to the present invention, chips do not remain on the inner peripheral surface and the bottom side even after a large-diameter drilling operation.
Workability and hygiene can be improved. Further, since the high-temperature chips generated from the drilling do not contact the inner peripheral surface of the core, the entire core drill can be cooled.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing an embodiment of a chip removing device for a core drill provided with a dust collector according to the present invention.

FIG. 2 is a longitudinal side view showing a state of flow of chips in a conventional core.

FIG. 3 is an explanatory diagram showing a flow state of a chip according to the present invention.

FIG. 4 is a bottom view showing a tank according to the present invention.

FIG. 5 is a graph showing dust collection characteristics when a core drill having a diameter of 65 mm according to the present invention is used.

[Explanation of symbols]

1 is a rotary tool, 2 is a core drill, 3 is an adapter, 4 is a dust collector, 5 is a tank, 5s is a bellows, 6 is a swarf removal hose, 6a is a bellows, 7 is a rubber ring, 8 is a protrusion, and 9 is smooth. Plate 10 is a chip.

Claims (2)

[Claims] A chip removing device for a core drill, comprising: a substantially cylindrical core drill attached to a rotary tool; and a dust collector for sucking dust through the inside of the core drill. A chip removing device for a core drill, comprising: a tank which can be extended and contracted in a direction, and an extensible chip discharge hose which extends through the inside of the tank. 2. An apparatus for removing chips from a core drill according to claim 1, wherein the outer periphery of the upper and lower portions of the tank and the inner peripheral surface of the core drill are in contact with each other, and a plurality of projections are provided on the bottom.