JPH0518033Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a water injection device for a drilling tool such as a diamond core bit.

[Background of the idea]

The prior art will be explained with reference to FIG. According to the conventional technology, while keeping the diamond core bit 2 facing upward, water is poured directly from the opening side, and then,
This is a method of inserting a water-containing elastic body 5 having a guide pin 8 and a pressing plate 7 at its tip. However, this method not only requires the troublesome work of holding the rotary tool 1 or the diamond core bit 2 upward with one hand every time water is supplied into the diamond core bit 2, but also makes it difficult to carefully supply water. However, there was a drawback that water could get into the rotary tool 1. This can be countered by attaching a waterproof cover 10 to the tip of the tool, but this has the disadvantage that the tool itself becomes expensive.

Furthermore, since the volume ratio of the hydrous elastic body 5 to the space inside the diamond core bit 2 is high,
The disadvantage was that the water holding capacity was low, and the efficiency of the entire drilling operation was significantly reduced.

[Purpose of invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a simple and high water content device for water injection into this type of drilling tool.

[Summary of the idea]

In this invention, if a water tank integrated with a water-containing elastic body is removably installed in a drilling tool such as a diamond core bit, water supply work can be simplified regardless of a rotary tool. , and focusing on the fact that the water holding capacity increases, the shape of the water tank,
The structure and the bonding relationship with the hydrous elastic body have been devised.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings. The water tank 3, which is the key point of the present invention, is made of a thin plastic material and has a cylindrical shape with a bottom at both ends, as shown in FIG. are doing. The outer circumferential dimension of the bellows part is determined so that it can be freely inserted into and removed from the body of the diamond core bit 2, and the bellows shape is set to an appropriate size in consideration of drilling depth ability, water storage capacity, etc. The shape is determined by the number of bellows and wall thickness. Further, at the bottom of the tip side of the water tank 3, a circular hole 6 of a size that allows relatively easy supply of water 9 is provided in the center, and serves both as water supply and water injection.

The diameter of the water tank 3 decreases to a certain length from the bottom of the water tank 3, and the water-containing elastic body 5 is formed to fit into the narrow bellows portion 4b of the water tank 3. A pressure plate 7 with a small circumferential diameter is fused to the tip of the water-containing elastic body 5, and a guide is provided to provide an appropriate distance between the concrete surface and the pressure plate 7 to facilitate pouring water 9. A pin 8 is inserted into the center of the pressing plate 7.

With the water injection device constructed as described above, the drilling operation thereof will now be explained with reference to FIG. 2. First, the water tank 3 fitted with the hydrous elastic body 5
is taken out from the inside of the diamond core bit 2, and the water-containing elastic body 5 is removed. And hole 6
After filling the tank with water until it is almost full, the water-containing elastic body 5 is placed in the water tank 3 again.
to fit. During this time, the work is very easy because the diamond core bit 2 only needs to be left in a predetermined position. Then, the water tank 3, which is fully filled with water and fitted with the water-containing elastic body 5, is inserted into the diamond core bit 2 again, and the water supply operation is completed. Regarding water injection work, as the drilling work progresses, pressure from the concrete surface is transmitted to the guide pin 8, the pressing plate 7, the water-containing elastic body 5, and the water tank 3 in this order, compressing the bellows part 4 and draining the water in the tank. Water is gradually injected from the hole 6 through the water-containing elastic body 5 along the route shown by the arrow in the figure. The injected water is sent toward the opening along the body and inner wall of the diamond core bit 2, moistening the cutting edge and cutting surface, thereby cooling and lubricating it.

As described above, the present invention is a water injection device for a drilling tool that performs water injection through the above-described operation.

[Effect of idea]

According to the present invention, a water tank integrated with a water-containing elastic body that is expandable in the longitudinal direction and can be easily supplied with water can be removably installed inside the diamond core bit. We were able to overcome the shortcomings of conventional technology, such as supporting the main body or providing a waterproof structure to the main body, and we were also able to increase the content, significantly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the drilling device according to the present invention, Fig. 2 is a side sectional view showing the progress of the drilling operation, and Fig. 3 is a side sectional view showing a conventional technique. . In the figure, 1 is a rotary tool, 2 is a diamond core bit, 3 is a water tank, 4 is a bellows part, 4a is a large diameter bellows part, 4b is a small diameter bellows part, 5 is a hydrous elastic body, 6 is a hole, and 7 is a bellows part. A pressing plate, 8 a guide pin, 9 water, and 10 a waterproof cover.

Claims (1)

[Scope of utility model registration request] A drilling tool such as a diamond core bit, which is attached to the tip of a rotary tool such as a drill and rotated to perform drilling work in concrete walls, etc., is a stepped cylindrical member with a bottom at both ends, and the outer surface in the longitudinal direction is a large diameter part and Each of the narrow diameter portions has a bellows shape that is movable in a telescopic manner, and a water tank having one or more holes formed in the bottom of the narrow diameter portion is installed in the drilling tool, and the narrow diameter portion is provided with a bit. A water injection device for a drilling tool, characterized in that the water injection device is arranged so as to be freely inserted and removed so as to be on the side, and a water-containing elastic body is arranged so as to be able to be freely attached to the narrow diameter portion of the water tank.