JPH045231Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a water injection device for improving the cutting performance of a diamond core drill.

(Prior art) When drilling concrete, etc. using a diamond core drill, water is generally poured into the cutting area.
Wet machining methods are often used to cool the core bit that is heated during cutting to reduce wear on the core bit, and to prevent clogging of the core bit by flowing chips to maintain good cutting quality.

Conventional water injection devices for wet machining include those that inject cooling water into a water injection hole provided at the center of the spindle from the outside of the core drill body in the radial direction, and those that inject cooling water into the water injection hole provided at the center of the spindle. A type that has a water injection hole that passes through it and injects cooling water from the end opposite to the side where the tool is attached (for example, Utility Model Publication No. 49-84783)
It was hot.

(Problems to be solved by the invention) In the conventional water injection device described above, when cooling water is injected from the fixed core drill body, the injection port is fixed at one location on the circumference. Depending on the location of the water supply source, the hose that connects the water supply source and the inlet may bend and obstruct water flow, or the hose may come off, or the hose may become kinked when moving the diamond drill. In addition, depending on the structure of the diamond core drill, it is often impossible to inject water from the opposite end of the main shaft where the core bit is attached, as an electric motor is attached to the end of the main shaft. The point was hot.

This invention solves the above-mentioned conventional problems and eliminates the possibility of the hose being bent or twisted, regardless of the positional relationship with the water supply source or the structure of the diamond core drill, making it possible to connect the hose. It is an object of the present invention to provide a water injection device for a diamond core drill, which allows the diamond core drill to be easily moved as it is.

(Means for Solving the Problems) This invention to achieve the above object is to provide a water injection hole opening at the mounting end of the core bit in the axial center of the main shaft to which the core bit is attached, and to attach the bearing to the main shaft. A water injection ring is rotatably fitted onto the outer periphery of the end of the core drill body held through the main shaft from which the main shaft protrudes, and one of the outer periphery of the water injection ring is fitted.
A diamond core drill is provided with a water inlet penetrating through the inner periphery at a location, and an inlet channel that communicates the core drill main body and the main shaft in the radial direction from the water inlet to the water inlet. It is a water injection device.

(Function) According to the above configuration, the water injection ring is attached to the water injection port and the water injection hose is connected, and the water injection ring can be rotated freely, so no matter which direction the diamond core drill is oriented with respect to the water supply source. Since the water injection tank can be freely oriented in a convenient direction with respect to the water supply source, the hose connecting the water supply source and the water injection tank is in a natural state, and there is no stress on the hose, and there is no risk of bending or bending the hose. This prevents it from coming off and allows for stable water injection.

(Example) This invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 denotes a core drill main body, an electric motor 2 is attached above, and one side is attached to a support 3 so as to be movable up and down.

A main shaft 4 is driven by an electric motor 2, supported by the core drill body 1 via a bearing 5, protrudes below the core drill body 1, and has a cylindrical core bit 6 screwed onto its lower end.

A water injection hole 7 that opens at the lower end is provided in the axial center of the main shaft 4, and a radius extending from the outer periphery to the water injection hole 7 is provided at the far end of the water injection hole 7 at a position corresponding to the lower end of the core drill body 1. Inlet hole 8 drilled in the direction
is provided.

A water injection ring 9 is rotatably fitted around the outer periphery of the lower end of the core drill body 1 from which the main shaft 4 protrudes, and is prevented from coming off by a retaining ring 10. A water inlet 11 penetrating the inner circumference is provided at one location on the outer periphery of the water inlet ring 9, and a water inlet 12 is attached to this water inlet 11.

Reference numeral 13 denotes an injection channel groove, which is annularly provided at a position corresponding to the water injection port 11 on the outer periphery of the lower end in contact with the inner periphery of the water injection ring 9 of the core drill body 1. One or more injection channel holes 14 are provided in the radial direction.

Reference numeral 15 denotes a passage space, in which seal rings are provided above and below the injection passage holes 8 and 14 between the inner circumferential surface of the core drill body 1 containing the injection passage 14 and the outer circumferential surface containing the injection passage hole 8 of the main shaft 4. 16 and 16a.

The injection channel groove 13, the injection channel hole 14, the injection channel space 15, and the injection channel hole 8 form an injection channel that communicates the water injection port 11 and the water injection hole 7.

17, 17a are O-rings, core drill body 1
It is disposed above and below the water inlet 11 and the water inlet groove 13 at the sliding portion between the water inlet ring 9 and the water inlet ring 9 to prevent water leakage.

18 is a hose that connects a water supply source (not shown) and the water injection pot 12.

With the above configuration, when the water injection pot 12 is opened, cooling water is supplied from the water supply source to the hose 18 and the water supply pot 1.
2. Through the water supply port 11, the water injection channel becomes the water injection channel, the water injection channel groove 1
3, injection channel hole 14, injection channel space 15, injection channel hole 8
It communicates with the water injection hole 7 in the axial center of the spindle 4 through the water injection hole 7 and injects water into the cylindrical interior of the core bit 6 to cool the cutting edge 6a during cutting and to prevent clogging by flushing away chips. .

In this case, since the water injection ring 9 can freely rotate with respect to the core drill body 1, the water injection ring 12 can be moved to a convenient position no matter which direction the water supply source is in the operating state. .

(Effects of the invention) According to the water injection device according to the invention described above, the water injection port can freely rotate 360° around the main shaft, so no matter which direction the water supply source is in use, The water inlet can be positioned in a direction that is convenient for connecting the hoses, which prevents the hoses from bending or kinking, obstructing water flow, or coming off, allowing for normal water injection. I can do it. Furthermore, even when the diamond core drill is moved sequentially to drill holes, there is no need to replace the hose each time, making it extremely convenient to use.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a diamond core drill equipped with a water injection device of this invention, and FIG. 2 is an enlarged sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Core drill body, 4... Main shaft, 6... Core bit, 7... Water injection hole, 8... Water injection hole, 9...
... Water injection ring, 11 ... Water injection port, 12 ... Water injection hole, 13 ... Water injection groove, 14 ... Water injection hole, 1
5...Injection channel space.

Claims (1)

[Scope of utility model registration request] A water injection hole that opens at the installation end of the core bit is provided in the axial center of the main shaft to which the core bit is attached, and a water injection ring is installed on the outer periphery of the end from which the main shaft protrudes of the core drill body that holds the main shaft via a bearing. is rotatably fitted, a water inlet penetrating the inner periphery is provided at one location on the outer periphery of the water inlet ring, and the core drill body is connected to the core drill body from the water inlet,
A water injection device for a diamond core drill, characterized in that an injection channel is provided that communicates with the main shaft in a radial direction and leads to the water injection hole.