JPH0452014Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a drilling device used for drilling holes in mortar, concrete, etc.

(Prior art) For drilling holes in mortar, concrete, etc.
A core drill is used that has a cylindrical core body with a shank connected to the center of the upper end.

When drilling a hole using this type of core drill, chips become dust and are scattered over a wide area when the drilling section is open.

In order to prevent these chips from scattering, there are methods of drilling the hole while pouring water into the hole, and covering the hole, including the core body, with a bellows-like expandable cover.
A method is used to drill holes while injecting water into the cover.

(Problem to be solved by the invention) By the way, according to the wet drilling method in which water is injected into the hole as described above, water injection equipment and equipment for treating sewage containing chips discharged from the hole, etc. There are problems such as not only requiring large-scale auxiliary equipment, but also restrictions on where work can be performed.

This idea was developed in view of the above points, and does not require water injection; instead, airflow is generated spontaneously within the cover, and chips (dust) generated at the perforation are carried on this airflow. It is an object of the present invention to provide a drilling device that realizes a dry drilling method in which drilling is carried out under pressure to a predetermined processing location.

(Means for solving the problem) The gist of this invention to achieve the above object is to provide a core drill with a shank connected to the center of the upper end of the core body, and a core drill with a gap formed around the core body. A bellows-type cover that covers the main body, a ventilation hole provided at the base of the shank that communicates the outside world with the inside of the core body, and an intake that is arranged inside the core body and introduces outside air into the core body through the ventilation hole. A fan, a dust removal pipe attached to the cover and communicating with the gap between the core body and the cover, and a dust removal pipe installed in the gap between the core body and the cover to suck out air containing chips from the gap to the dust removal pipe side. A drilling device characterized by being equipped with a suction fan.

(Function) In the above configuration, when the core drill rotates during drilling, the suction fan rotates inside the core body, and the suction fan rotates together with the core drill in the gap between the core body and the cover. This creates an air flow that passes through the gap and reaches the dust removal pipe.
Chips generated at the perforation are forced to a predetermined location by this air flow.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

The drawing is a longitudinal sectional view of this invention.

In the figure, reference numeral 1 denotes a core drill, in which a cutting blade 3 made of a diamond grinding wheel blade, a carbide chip, etc. is implanted in the lower peripheral edge of a cylindrical core body 2 with an open lower end, and a cutting blade 3 made of a diamond grinding wheel blade, a carbide chip, etc. is installed in the center of the upper wall of the core body 2. It is made by installing shank 4 in succession.

5 is a bellows type cover which forms a gap 6 between it and the core body 2, and which is open at the lower end, through which a shank 4 is rotatably supported through the center of its upper wall.

Reference numeral 7 denotes a ventilation hole in the base of the shank that penetrates the upper wall from inside the core body and communicates from the center of the shank to the outside world; 8 denotes a suction fan disposed inside the core body close to the upper wall; It is attached to a shaft 9 that protrudes inside the core body concentrically with 4.

Reference numeral 10 denotes a suction fan disposed at the base of the shank in the gap 6, and is attached to an overhanging arm 11 protruding around the shank.

Reference numeral 12 denotes a dust removal pipe attached to the upper wall of the cover 5 so as to communicate with the gap 6, and its outer end extends to an appropriate dust removal processing section (not shown).

Incidentally, reference numeral 13 in the figure indicates a ventilation hole formed on the circumferential surface of the core body 2 to improve ventilation from the inside of the core body 2 toward the gap 6.

In the above configuration, when the lower end of the cover 5 is placed on the surface of the object to be drilled and the core drill 1 is rotated to start drilling, the suction fan 8 rotates inside the core body 2 to introduce outside air from the ventilation hole 7 to core the core. Chips generated inside the main body 2 are pushed out to the gap 6 side.

At the same time, the suction fan 10 rotates outside the core body 2, and the chips generated in the gap 6, including the chips pushed out from inside the core body 2, are carried by the air flow and sucked out to the dust removal pipe 12 side. and pumped to an appropriate treatment location.

In addition, if the cutting blade 3 is sensitive to heat, such as a diamond grindstone blade, water droplets can be introduced through the ventilation hole 7, atomized by the suction fan 8, and supplied to the cutting blade 3. The cooling effect of the three parts of the cutting blade can be further enhanced.

(Effects) According to the drilling device of this invention configured as described above, in a core drill equipped with a cover, an air flow flowing from inside the core body into the gap between the core body and the cover is spontaneously generated, and chips are removed by this. Because it is carried by an air flow and sent under pressure to an appropriate processing location, the auxiliary equipment is simpler compared to conventional wet-type drilling equipment that processes chips by water injection, and there are no restrictions on where the work can be performed. Work efficiency is improved.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of this invention. 1... Core drill, 2... Core body, 3... Cutting blade, 4... Shank, 5... Cover, 6... Gap, 7... Ventilation hole, 8... Suction fan, 9...
Shaft, 10... Suction fan, 11... Extension arm, 12
...Dust removal pipe, 13...Vent hole.

Claims (1)

[Scope of utility model registration request] A core drill with a shank connected to the center of the upper end of the core body, a bellows-type cover that forms a gap around the core body and covers the core body, and a communication hole provided at the base of the shank that communicates the outside world with the inside of the core body. A suction fan that is arranged inside the core body and introduces outside air into the core body through the ventilation hole, a dust removal pipe that is attached to the cover and communicates with the gap between the core body and the cover, and the core body. A drilling device characterized by comprising a suction fan disposed in the gap between the cover and the cover to suck out air containing chips from the gap to the dust removal pipe side.