JP2000213269A - Non-work type special shank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a technical means to dispense with a core removing work of a diamond core drill, and to improve the working efficiency. SOLUTION: A crevice 4 part larger than the core diameter is provided on a cylindrical shank except a welded part of a diamond bit 1 to a power connection part, and the advancing core is freely discharged. In feeding a refrigerant, a cylindrical article 3 is fixed to and embedded in a groove part by machining a groove in the cylindrical shank, and the refrigerant is fed to a tip of the diamond bit 1 through the cylindrical article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shank portion of a diamond drill used for construction work, repair work, installation work of machines, ducts, pipes and the like.

[0002]

2. Description of the Related Art Conventionally, in a core type diamond drill, a diamond bit is welded to the tip of a cylindrical object, and when drilling concrete, a core is generated and the core enters the cylindrical object. In order to remove the core, the core of the cylindrical body is removed by hitting the body of the cylinder with a metal object, removing it from the tip of the diamond bit, removing the shank from the power motor part, and sticking with a metal rod from the rear end. .

[0003] Also, in a diamond drill using a coolant, coolant is supplied to the diamond bit portion from the rear end portion of the cylindrical shank through the inner cylinder portion, so that the resistance of the core into which the coolant enters is reduced. It acts to push back the crushed core. Therefore, core clogging is likely to occur. In addition, the crushed cores agglomerate in the shank peripheral surface plate, resulting in a large resistance of the entering cores, so that the coolant cannot be supplied to the cutting edge, leading to a decrease in the perforation ability.
The core clogging thus generated is removed from the drill each time by an operator to perform a core removing operation.

[Problems to be solved by the invention]

[0004] As mentioned in the prior art, the biggest drawback of diamond core drills is core clogging and core removal. In some cases, this core removal operation occupies most of the operation time, and simply solving this large problem simply improves the operation efficiency by several tens of percent. However, to solve this problem,
There is no choice but to automatically eject the core or use a non-core type that does not generate a core.

[0005] It is known that the non-core type has a perforated cross-sectional area that is larger than the core type, and the perforation ability is significantly reduced. At present, the non-core type is used only for a small diameter of about 10 mm or less. . In contrast to such a non-core type diamond bit, the core type diamond bit has a smaller drilling blade and a smaller drilling cross-sectional area, so that the drilling speed is higher. Even with these features, the core type diamond bit is the most ideal form as long as it can solve the problems of core clogging and core removal work. Therefore, it is the biggest challenge.

[Means for Solving the Problems]

First, there is a means for eliminating the core removing operation. The point of eliminating the clogging is to eliminate the frictional resistance with the inner wall surface in the cylindrical shank so that the core can freely enter the cylindrical shank. It is. The means is to provide a crack in the cylindrical shank portion excluding the diamond bit and the power connection portion, which is larger than the outer diameter of the core. According to the present invention, the core that has entered the cylindrical shank at the time of drilling does not receive the resistance of the inner peripheral surface plate of the cylindrical shank, and does not become the resistance of the entering core, but is pushed up by the entering core. It is automatically discharged outside by the centrifugal force of the drill. The core remaining in the fracture is discharged by the centrifugal force of the drill at the moment when the cylindrical shank is pulled out from the drilled hole.

Next, regarding the method of supplying the coolant, the method according to the present invention provides a large crack in the cylindrical shank,
To pass the core through it, inside the peripheral plate of the cylindrical shank,
Alternatively, a coolant flow path must be formed in the outer peripheral face plate and the inner peripheral face plate. Conventionally, we thought that it was necessary to drill too deep inside the peripheral plate of the cylindrical shank and to provide an opening, requiring too advanced processing technology.
By changing the idea and using a pre-processed cylinder,
It was found that a flow path could be freely secured inside the peripheral plate of the cylindrical shank, or on the outer peripheral plate and the inner peripheral plate. This processed product utilizes a tubular material which is usually used for a guide for a lead such as a mechanical pencil. A groove is previously formed in the cylindrical shank portion, and the cylindrical object is fitted therein, and is adhered and fixed with an adhesive. Alternatively, the entire groove is filled and integrated with the peripheral plate. By this means, technologies that in the past seemed almost impossible were very easily possible.

[0008] By connecting a diamond bit to one end of the cylindrical shank as described above and a power connection to the other end, it is possible to perform drilling while supplying a coolant from the power connection. .

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows the entire configuration of a non-work type special shank. The non-work type special shank is divided into a power connecting portion in FIG. 2 and a cylindrical shank in FIG. 3 in which one diamond bit is welded. The power connection part in FIG. 2 enables the power part and the cylindrical shank in FIG. 3 to be screwed. FIG. 3 The cylindrical shank has one diamond bit welded to the tip, and two vertical grooves are dug in the body, and the three cylindrical objects are bonded and fixed. In addition, a large crack is provided on the side surface in a vertical shape, and the rear end is in a closed state. The above-mentioned power connection part in FIG. 2 and the cylindrical shank in FIG. 3 are connected, and an adhesive is applied to the bellows part to secure airtightness, thereby completing the product of the present invention.

[0010] By connecting the non-work type special shank prepared in the above-described manner to the power unit, the coolant is supplied to the three cylindrical objects of the cylindrical shank through the power connection unit in FIG. Coolant is supplied to the tip of one diamond bit, and smooth drilling is possible.

【Example】

According to the embodiment, a product of the present invention was prepared and a piercing test was performed as follows. As a test method, 5
Holes are continuously drilled, the drilling speed at that time, and the switching time until the next hole is drilled are measured, and the state of core removal is confirmed visually. Drilling object Ground boundary block Drilling diameter 25mm Drilling depth 200mm Number of drilling holes 5 holes Drilling pressure Approx.

Advantages of the Invention 1: Since the core can be automatically discharged from the crack by the centrifugal force of the drill, there is no need to remove the core. 2: Since a large crack was formed on the side surface of the cylindrical shank, the resistance of the inner wall of the cylindrical shank was reduced, and the drilling ability was improved. 3: Since a large crack was formed on the side surface of the cylindrical shank, the weight of the entire cylindrical shank was extremely reduced, and the handling became easy. 4: The switching time from one hole drilling to the next hole drilling was very short, and there was no core removal operation, so the drilling efficiency was greatly improved.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view of the entire non-work type special shank.

FIG. 2 is a perspective view of a power connection unit.

FIG. 3 is a perspective view of a cylindrical shank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diamond bit 2 Groove 3 Cylindrical object 4 Crack 5 Cylindrical shank connection part 6

Claims (4)

[Claims] 1. A core bit for concrete drilling, wherein a groove is formed in an outer peripheral surface plate or an inner peripheral surface plate of a cylindrical shank portion, a pre-processed cylindrical object is fixed in the groove portion, and the cylindrical object is passed through. Non-work type special shank that can supply water, air, liquefied gas, vaporized gas organic solvent or its mixture (hereinafter referred to as coolant) to the tip of the core bit for concrete drilling 2. A processing method for forming a flow path of a coolant inside a cylindrical shank portion peripheral face plate of a core bit for concrete drilling, which is possible by incorporating a pre-processed cylindrical material into the groove. Processing method 3. A method of forming a flow passage in an outer peripheral surface plate or an inner peripheral surface plate of a cylindrical shank of a core bit for concrete drilling, wherein a groove is formed in an outer peripheral surface plate or an inner peripheral surface plate of a cylindrical shank portion. Forming method that is made possible by fixing a pre-processed cylindrical object in the groove 4. The technique according to claim 1, and claim 2 and claim 3.
A method in which a shank manufactured by the above-mentioned processing method and a flow path provided in the peripheral surface plate by another method are provided, and a crack penetrating left and right is provided in the shank except the power connection part and the diamond bit welded part. Non-work type special shank