JPH1110425A - Clogging prevention method of bit for non-core type diamond drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of core clogging and to improve efficiency of hole drilling work at site. SOLUTION: In this clogging prevention method of a bit for non-core type diamond drill, an injection port 4 of a coolant is provided in an outer peripheral part from a central part of a non-core type diamond bit 1 by 20% or more of a diameter of the injection port of the coolant, the central part is closed and blocked, and the injection port 4 is moved due to the rotation of the non- core type diamond bit 1. The dimension of a side face opening of a slit 5 is larger than the diameter of the injection port 4 of the coolant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-core type diamond bit for drilling a small-diameter hole in a concrete structure such as a floor, a wall or a ceiling of a building.

[0002]

Conventionally, a non-core type diamond bit used in a wet-type drilling system and a dry-type drilling system is provided with an ejection port for ejecting a coolant at the center thereof. It has been pointed out that there is a problem that fine cores and shavings are clogged in the jet port, generating heat and causing no perforation ability.

[0003] If the coolant outlet becomes clogged during operation, the operation is stopped, the diamond bit is removed, and the object is cleaned with a thin needle-like object.

[0004] If the operator operates the drill without knowing the clogging due to lack of experience, the diamond bit generates heat and carbonizes, and the drilling ability is lost, making it unusable.

[0005] Particularly in scaffolding work at a high place, it is difficult to stop and clean the machine every time clogging occurs due to a narrow work space.

[0006] When the above problem occurs at the work site, the work efficiency is reduced, and the work delivery time may be greatly shifted.

An object of the present invention is to solve such a problem of core clogging and improve the efficiency of drilling work on site.

[0008]

According to the present invention, a coolant outlet of a non-core type diamond bit is provided at an outer peripheral portion from a center portion of the non-core type diamond bit.
The center of the spout moves with the rotation of the non-core type diamond bit.

[0009] The core hits and closes the central block formed by the provision of the jet outlet on the outer periphery, and is discharged by the jet pressure of the coolant.

The bit exchange is greatly simplified by allowing the shank shaft 2 and the bit portion 10 to be separated as shown in FIGS.

Further, the shank shaft is of a separate type, the bit portion 10 is a female screw portion 11, and the shank shaft 2 is a male screw portion 1.
By setting the number to 2, the coolant outlet can be easily provided at the outer peripheral portion from the center of the non-core type diamond bit.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a commercially available wet type super drill OJ-1 is used will be described. Super Drill OJ-1 FIG. 5 shows a drilling system comprising a holder 7 containing two aerosol-type coolants, a power unit in which a motor 8 and an automatic switching valve system 6 are joined, and a spiral tube 9 for supplying a coolant. The non-core type diamond bit according to the present invention, FIGS. 2, 3 and 4, will be described below.

FIG. 1, a shank shaft 2 having a flow path 3 attached to an automatic switching valve system 6 was prepared, and a non-core type diamond bit 1 was manufactured and welded to the tip thereof.

Non-core type diamond bit 1
Has a slit 5, and an opening 4 is opened at the tip of the shank shaft 2 in the gap of the slit 5.

An integrated product of the shank shaft 2 and the non-core type diamond bit 1 having the above-described configuration is attached to the automatic switching valve system 6.

[0016]

EXAMPLE In accordance with the above-described embodiment, an experiment was conducted with respect to the opening position in FIG. 4 and the occurrence rate of clogging.

Drilling conditions

[0018]

From the above results, the difference between the case where the nozzle 4 is located at the center of the non-core type diamond bit 1 and the case where it is located at the outer periphery is as follows.

[0020]

According to the present invention, as described above, the perforation magnification is improved to 1.59 times as compared with the conventional product only by moving the jet port 4 by 0.1 mm.
It can be seen that the drilling efficiency is improved to 0.98 times and the drilling efficiency is significantly improved.

Further, since the occurrence rate of clogging is reduced, a great effect is exhibited in improving efficiency in on-site work and reducing consumables and labor costs.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a super drill system is omitted.

FIG. 2 is a perspective view of a non-core type diamond bit.

FIG. 3 is a bottom view of the non-core type diamond bit.

FIG. 4 is a sectional view of a non-core type diamond bit.

FIG. 5 is a perspective view of the entire super drill system.

FIG. 6 is a front view of a separable shank shaft and a bit portion, with a part of a super drill system not shown;

FIG. 7 is a sectional view of a separated type of a non-core type diamond bit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Non-core type diamond bit 2 ... Shank shaft 3 ... Flow path 4 ... Spout port 5 ... Slit 6 ... Automatic switching valve system 7 ... Cylinder holder 8 ... Motor 9 ... Spiral tube 10 ... Bit part 11 ... Female thread part 12 ... Male thread

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[Procedure amendment]

[Submission date] April 3, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

Claims (6)

[Claims] 1. Water, a solvent, a liquefied gas, a compressed gas, air, or water, a solvent, a liquefied gas, a compressed gas used for the purpose of cooling frictional heat at the time of drilling, or lubricating and auxiliaries at the time of drilling. A non-core type diamond bit used for a drilling system for concrete using various combination liquids (hereinafter referred to as a cooling agent) such as air, wherein the diameter of the non-core type diamond bit is 20% or more of the diameter of the coolant outlet. A method for preventing clogging of a non-core type diamond drill bit in which the center of the coolant outlet is moved from the center to the outer periphery. 2. A method for preventing clogging of a bit for a non-core type diamond drill according to claim 1, wherein the outlet of the coolant moves with rotation of the bit for the non-core type diamond drill. 3. The method for preventing clogging of a bit for a non-core type diamond drill according to claim 1, wherein the core hits a closed portion formed by moving a coolant outlet to an outer peripheral portion, and the core is broken. . 4. A method for preventing clogging of a bit for a non-core type diamond drill according to claim 1, wherein a side opening dimension of the slit is larger than a diameter dimension of the coolant outlet. 5. The method for preventing clogging of a non-core type diamond drill bit according to claim 1, wherein the shank shaft is separable. 6. A method for preventing clogging of a bit for a non-core type diamond drill according to claim 1 and claim 5,
6 and 7 are male-shaped connections.
Bit portion 10 in FIGS. 6 and 7 is characterized in that it is a female connection.