JPH01178405A - Boring device for concrete - Google Patents

Abstract

PURPOSE:To constitute the title device so that cooling water overflows over neither a wall surface not a floor surface by evaporating easily the water through heating of a blade part, by providing an air-water mixing device which is interposed between a bit and air pressure source and mixing mistlike water with air circulating into an air conduit. CONSTITUTION:The title device possesses a a diamond core bit 2 comprised of a hollow body, and blade part 1 provided on the tip in a state of dispersion, whose rear end part is connected with a rotary driving source. An end of an air conduit 4 is communicated with an air pressure source 3 and the other end is communicated with a hollow part of the diamond core bit 2. An air-water mixing device 5 is interposed between the diamond core bit 2 and air pressure source 3 and mistlike water is mixed with air circulation into the air conduit 4. The mistlike water is mixed with the air with the air-water mixing device 5 and the air is fed into the hollow part of the diamond core bit 2. Then the air is led to the blade part 1, evaporated through heating at the time of boring and cools a blade part 1 through the heat of evaporation. Steam after cooling is discharged into a dust collector or the open air and there is no fear of wetting a wall surface or a floor surface.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention mainly relates to a concrete drilling device for forming holes for installing anchor bolts and the like in the wall or floor of a room where OA equipment etc. are present, and in particular, Concerning items that do not allow water or dust to scatter inside.

[Traditional technique]

There are two methods for drilling holes in concrete: one using a vibrating drill, and the other using a cylindrical diamond core bit. The former generates significant noise and dust, so OA
It is not suitable for drilling work in areas with equipment. Next, the method using a diamond core bit is relatively vibration-free, but the drilling process requires sufficient cooling water, which is supplied directly from a tap or from a tank located at an elevated location. This cooling water cools the blade of the diamond core bit and prevents the diamond powder contained in the blade from burning out.

For this purpose, conventionally, drilling work was carried out while supplying a relatively large amount of water from inside the core. However, such cooling water is not particularly suitable for drilling work in a room containing OA equipment.

[Means for resolving issues]

Therefore, the present invention supplies water in the form of a spray together with air, and easily evaporates the water by heating the blade during drilling, thereby preventing the cooling water from flowing out onto the wall or floor. The structure is as follows.

That is, it has a diamond core bit 2 made of a hollow body, the blade portions 1 are disposed at the distal end thereof in a distributed manner, and the rear end portion is connected to a rotational drive source. One end of the air conduit 4 is communicated with the air pressure source 3, and the other end is communicated with the hollow portion of the diamond core bit 2. It is characterized in that an air/water heating device 5 is interposed between the diamond core bit 2 and the air pressure source 3, so that mist water is mixed into the air flowing through the air conduit 4.

(Function) Therefore, according to this concrete drilling device, atomized water is mixed with air by the air/water heating device 5, and the air is supplied to the hollow part of the diamond core bit 2. 1, it evaporates due to heat generated during drilling, and the blade portion 1 can be cooled by the heat of evaporation.

At the same time, the water vapor after cooling is released into the dust collector or the atmosphere, and there is no risk of wetting the walls or floor.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of the present device, and FIG. 2 is an explanatory diagram of concrete drilling work using the same device. In this embodiment, the drilling machine 17 is provided with a rotary shaft 18 driven by power as shown in FIG. The rear end is screwed on. This diamond core bit 2 is formed hollow, and a plurality of arc-shaped blade portions 1 are fixed by brazing in a dispersed manner to the tip thereof. And this blade part l is mixed with diamond powder.
As an example, an air introduction hole 19 is bored on the outer periphery of the rotating shaft 18 of the drilling machine 17, and the air conduit 4 is connected through the hole 19.
This air conduit 4, at least for the most part, consists of a flexible hose, and the other end communicates with an air pressure source 3. An air/water heating device 5 is located in the middle. This air/water heating device 5 includes a container 23 into which water lO is poured from a water supply plug 15.
The pipe 20 is inserted into the container 23. Then, water droplets 11 drip from the water dripping part 16 provided at the upper end of the air-water mixing device 5, and are turned into mist 9 by the air 7.
and is supplied to the diamond core bit 2. That is, the water 10 in the container rises through the pipe 20 and the lower part of the water volume adjustment plunger 13, and drips from the upper end of the water dripping part 16. At this time, the water volume adjustment dial 14 is adjusted by moving the water volume adjustment plunger 13 up and down.
Adjust the amount of dripping. The reason why the water 10 rises in the pipe 20 is because a part of the compressed air 7 flows into the container through the communication hole 21 and its internal pressure pushes down the surface of the water 10. Water droplet 11 in the dripping part 16 of
For example, for a diamond core bit of about 20 mm, a flow rate of about 1.5 cc to 3 cc per minute is sufficient. The water droplets 11 are turned into mist 9 by the air 7 and are supplied to the tip of the diamond core bit 2. Air and mist water supplied to the tip of the diamond core bit 2 evaporate due to heat generated during drilling, and the blade portion 1 is cooled by the heat of evaporation. Next, the air 7 flowing out of the blade part 1 passes through the bellows 8 and is guided to the dust collector 6. Concrete dust is then removed by the device 6. By doing this, the 5
The amount of water is significantly less, from 1/30 to 17 liters per unit time compared to conventional
It will be about 50. Experiments have shown that even with such a small amount of dripping, the diamond and the tip of the core bit 2 can be sufficiently cooled and the drilling operation can be performed smoothly. Moreover, the drilling speed was almost the same as the drilling speed of a conventional method in which a large amount of cooling water was supplied. Furthermore, since water does not enter the dust collector, the filter does not become clogged, and the dust collection ability can be continuously maintained. At the same time, the concrete powder captured by the filter of the dust collector was maintained in a dry state, and its discharge treatment was extremely easy.

[Effects of the Invention] This device can also mix mist water into the air flowing out from the tip of the diamond core bit 2.
The water mist is evaporated at the concrete perforation, and the heat generated by the perforation can be absorbed as heat of evaporation. Therefore, the blade portion 1 can be cooled and concrete drilling work can be easily performed. Moreover, since the water mixed in the air is formed into a mist and evaporates easily, there is no risk of staining the area around the perforation with water. Therefore, it is possible to provide an apparatus suitable for drilling walls and floors in rooms where OA equipment and the like are present.

[Brief explanation of the drawing]

FIG. 1 is an explanatory schematic diagram of the present device, and FIG. 2 is a schematic diagram of performing drilling work using the same device. 1...Blade part 2...Diamond core bit 3...Air pressure source 4...Air conduit 5...
・Air-water mixing device 6... Dust collector 7... Air 8... Bellows 9... Fog I
O...Water 11...Water droplet 12...Filter 13...Water amount adjustment plunger 14...Water amount adjustment dial 15...Water supply plug 1
6...Water dripping part 17...Drilling machine 18...
・Rotating shaft 19...hole 20...pipe
21...Communication hole 22...Wall surface
23...Container agent Patent attorney Kubo 1) Takumi

Claims (1)

[Claims] A diamond core bit (2) consisting of a hollow body whose rear end is connected to a rotational drive source and has blade portions (1) dispersively at its tip, and one end communicated with an air pressure source (3),
an air conduit (4) whose other end communicates with the hollow part of the bit (2);
) and an air/water mixing device (5) that is interposed between the air conduit (4) and mixes atomized water into the air flowing through the air conduit (4).