JPH04189406A - Automatic magnetic drilling machine - Google Patents

Abstract

PURPOSE:To prevent drilling under the condition of exhausted cutting oil by providing a means for giving an alarm when an oil amount is under a certain amount in an oil tank for storing the cutting oil supplied to a drilling edge of an electric drill. CONSTITUTION:A vertically movable electric drill 5 is provided on an upper stand 2 of an electro magnet 1 and a cutting oil storing tank 14 for supplying the cutting oil to a drilling edge 4 of a drill 5 is mounted on the stand 2. A water level sensor 15 mounted to the side wall of the storing tank 14 is composed of reed switches 16a, 16b provided in two upper and lower portions of the wall surface and a magnet 17 floating on the oil surface in a groove section separated from the tank by a partition wall to equalize the water level to the cutting oil level in the tank 14. The upper switch 16a is turned on as the cutting oil level is gradually lowered, and further the lower switch 16b is turned on. A lamp on a display panel is lit by the ON signal, so that drilling is prevented under the condition of the exhausted cutting oil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic magnetic drilling machine having a feed motor for raising and lowering an electric drill along a stand.

[Background of the invention]

An automatic magnetic drilling machine uses an electromagnet to fix an electric drill to the workpiece material, detects the load current of the electric drill, and controls the rotation speed and rotation direction of the feed motor, from drilling to returning after drilling is completed. This is a drilling tool that can perform automatically until it stops. For this reason, a single worker can operate multiple machines, or work other than drilling can be performed at the same time as drilling, resulting in significant labor savings. During drilling, it is necessary to constantly cool the cutting tool by flowing cutting oil to protect it from seizure.

However, with conventional automatic magnetic drilling machines, although there are many opportunities for the work vehicle to leave the drilling machine as described above,
Even if the supply of cutting oil is cut off during drilling, drilling continues, which may cause damage to the workpiece material of the cutter. In addition, as a countermeasure, some systems have been designed to forcibly stop drilling by stopping the feed motor when cutting oil is no longer supplied, but this method stops when the cutting tool has entered the work material. This was not favorable for work, and the cutting edge could be damaged when the cutting tool was separated from the material to be stiffened.

The present invention has been made in view of the above, and its purpose is to prevent damage to cutlery caused by running out of cutting oil by notifying the operator of the decrease in cutting oil.

[Summary of the invention]

In the present invention, a decrease in cutting oil during drilling is detected by a water level sensor, and the operator is notified of this by an alarm means.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In the figure, 1 is an electromagnet, 2 is a stand, 3 is a drill motor that rotates the drill bit 4, 5 is an electric trill with built-in drill motor 3, and 6 is an electric drill 5 that automatically moves up and down along the stand 2. 7 is a power switch for energizing the electromagnet 1 and adsorbing the stand 2 to the workpiece (when closed, the power lamp on the display panel 8 lights up); 9 is a drill switch for rotating the electric drill 5; 10 is a power switch for rotating the electric drill 5; 12 is a controller that energizes the feed motor 6 and the semiconductor element 11 that controls the voltage supplied to the feed motor 6 (automatically turns on the lamp on the display panel 8 when closed);
The semiconductor element 11 is controlled based on the magnitude and change of the load current of the cone motor 3 detected by the current detector 13, and the rotation speed and rotation direction of the feed motor 6 are changed. Also oil tank 1
The cutting oil stored in 4 is introduced into the electric drill 5,
It flows out inside the cone 4. A water level sensor 15 is attached to a side wall inside the oil tank 14. As shown in FIG. 3, the water level sensor 15 includes a reed switch 16 mounted on the wall at two locations in the height direction, and a partition wall inside the oil tank 14, so that the water level is the same as that of the cutting oil in the oil tank 14. It consists of a magnet 17 that floats on the oil surface in a groove portion that looks like this. The reed switch 16 is turned on when the magnet 17 approaches a certain distance, and as the water level of cutting oil gradually decreases during drilling, the upper reed switch 16a is turned on, and when the water level falls further, the lower reed switch 16b is turned on. becomes ON. The ON signal from the reed switches 16a and 16b illuminates the cutting oil lamp on the display panel 8 via the alarm circuit 8. It is appropriate that the upper reed switch 16a is positioned at a water level at which cutting oil equivalent to several holes remains in the oil tank 14, and the lower reed switch 16b is positioned at a water level equivalent to two holes. At this time, if the color of the cutting oil lamp is set to light yellow when the upper reed switch 16a is turned on, and when the water level drops, the color changes from yellow to red when the lower reed switch 16b is turned on, the operator can accurately tell when the cutting oil level is decreasing. can be informed.

In this example, two reed switches and a magnet were used as the water level sensor, but the same effect can be obtained by using a flow switch or other sensor.6Also, even if the water level is detected at only one location, the alarm can be effective. .

Further, in this embodiment, a visual means is used as the warning means, but depending on the work environment, a similar effect can be achieved by using an auditory means, other means, or a combination of these means in the engraving of the specification.

〔Effect of the invention〕

According to the present invention, since it is possible to notify the operator of the decrease in cutting oil during automatic drilling, it is possible to prevent drilling work in a state where the cutting oil has run out and to prevent damage to the cutter.

[Brief explanation of the drawing]

Fig. 1 is an external view of an automatic magnetic drilling machine showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing an embodiment of the invention, and Fig. 3 is an illustration of an oil tank showing an embodiment of the invention. Partial sectional view,
FIG. 4 is a front view of a display panel showing an embodiment of the present invention. In the figure, 1 is an electromagnet, 2 is a stand, 5 is an electric trill, 6 is a feed motor, and 14 is an oil tank. Name of patent applicant Hitachi Koki Co., Ltd. Sai/i O3 Dan Sai 4m Procedural amendment (method) 1 Indication of case 1990 Original Patent No. 3194.
p, o No. 2 Title of invention Automatic magnetic drilling machine 3
Relationship with the case of the person making the amendment Patent applicant address 2-6-2 Otemachi, Chiyoda-ku, Tokyo Contact information Telephone (old I) 0292-72-2125 (
Intellectual property rights 1) 4 Date of amendment order March 12, 1991 5 Column 6 for the title of the invention, scope of claims, detailed explanation of the invention, and brief explanation of drawings in the specification subject to amendment 6 Content

Claims (1)

[Claims] an electromagnet; a stand supported on the top of the electromagnet;
an electric drill held by the stand so as to be slidable in the vertical direction and having a rotary blade attached to a rotating shaft at the tip; an oil tank storing cutting oil for supplying cutting oil to the blade while drilling a hole in a workpiece; The electric drill is characterized by having a feed motor for vertically moving the electric drill along the stand, and an alarm means for alerting an operator when the amount of cutting oil in the oil tank falls below a certain level. Automatic magnetic drilling machine.