JPH04240049A - Wireless ae pickup device - Google Patents

Abstract

PURPOSE:To prevent the interference with other equipment and improve the degree of freedom in the arrangement of transmitter and receiver, by transmit ting a detection signal by an AE pickup to a receiving demodulator wirelessly without using a lead wire. CONSTITUTION:It is composed of an AE pickup 1 and a transmitting part 2 arranged at the vicinity of a work 8 or work tool, and a receiving demodulating part 3 located at the position apart therefrom, and to transmit an AE pickup signal to the receiving demodulating part 3 wirelessly. The interference with other equipment can be prevented, and also the AE pickup 1, etc., can be arranged at the most effective position, by transmitting the AE pickup detection signal wirelessly.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an AE pickup device for detecting abnormal vibration of a machine or damage to a grindstone or a workpiece during grinding, such as in a jig grinding machine, and in particular,
The present invention relates to a wireless AE pickup device that can receive signals from an AE pickup at any position around a machine.

0002

2. Description of the Related Art For example, in a jig grinding machine, a workpiece 8 placed on a moving table 10 is ground by a grindstone 9, as shown in FIG. Conventionally, an AE (acoustic emission) pickup 1 is used to detect abnormalities during grinding. The AE pickup 1 is preferably placed near the grindstone 9 or the workpiece 8, for example, as shown in the figure, the spindle head 1 holding the quill 11
2. The AE pickup 1 is a detector that converts vibrations generated during machining into an electrical quantity and generates an electrical signal. If an abnormality such as abnormal vibration or damage to the workpiece 8 and the grindstone 9 occurs during processing, an electric signal corresponding to the abnormality is generated. The electrical signal is received by the receiving demodulator 3a
is received with amplified width. Earphone 4 to reception demodulator 3a
By connecting a hearing device such as a, abnormal sounds can be identified by sound.

0003

In the case of the conventional AE pickup device, the AE pickup 1 and the amplifier receiving section 3a are connected by a lead wire 13, as shown in the drawing. As described above, since the AE pickup 1 is placed near the grinding wheel 9 or the workpiece 8 such as the spindle head 12, the lead wire 13 is connected to the spindle head 12 and the movable table 1.
There may be cases where interference occurs with various devices and instruments around 0. Therefore, a problem arises in that the AE pickup 1 and the reception demodulator 3a cannot be freely arranged. That is, it is likely that the AE pickup 1 etc. cannot be placed at the most desirable position. The present invention solves the above-mentioned problems, and aims to provide a wireless AE pickup device that can install the transmitter/receiver section of the AE pickup device at any position, and can accurately grasp abnormalities in workpieces and processing tools. purpose.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an A
A transmitting section that transmits detection signals of the E pickup and the AE pickup as radio waves or optical modulated waves is disposed, and a reception demodulation section that receives the waves transmitted from the transmitting section is provided at a position separated from the AE pickup. This constitutes a wireless AE pickup device.

[0005]

[Operation] Electrical signals from the AE pickup are transmitted from the transmitter as radio waves or optically modulated waves. The radio waves and the like are received by a receiving and demodulating unit located at a position apart from the AE pickup and the like, and the sound can be heard through earphones and the like at that position. Since the AE pickup and the like and the reception demodulator are not connected by a lead wire, they can be placed anywhere. This prevents interference with other devices and the like. Further, abnormal sounds can be accurately detected by the transmitter/receiver.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the grindstone 9 is supported by a high frequency motor 14, and the high frequency motor 14 is connected to the quill 11. The quill 11 is supported by a spindle head 12 of a jig grinder. On the other hand, the workpiece 8 is placed on a moving table 10, and the moving table 10 is slidably supported on a bed 15. In this embodiment, the AE pickup 1 is a moving table 10.
It is placed near the upper workpiece 8. Note that the AE pickup 1 may be fixed to the spindle head 12 as shown by the two-dot chain line in FIG. A transmitting section 2 is arranged near the AE pickup 1. The transmitter 2 is for transmitting the electric signal from the AE pickup 1, and is configured to transmit the electric signal from the AE pickup as a radio wave or an optically modulated wave, for example. Note that the technique of transmitting the sound wave signal caught by the AE pickup 1 as a radio wave or optically modulated wave is known in audio-related equipment. The reception demodulator 3 is placed at an appropriate position around the machine, away from the movable table 10 and the spindle head 12. The reception demodulator 3 is configured to receive the radio wave transmitted from the transmitter 2, demodulate and amplify it, and receive it.

As shown in FIG. 2, an earphone 4 or an AE converter 5 is connected to the reception demodulator 3. The earphone 4 is used to listen to the electrical signal received by the receiving and demodulating section 3 in terms of sound quality and volume. The AE converter 5 converts the electric signal from the AE pickup 1 into AE converters such as vibration waveforms and peak values.
It has a signal processing function for converting it as information and inputting it to the CPU 6. The AE information input to the CPU 6 is used as an information source for issuing status commands for the workpiece 8, grindstone 9, etc. It is also displayed on the CRT 7 so that the grinding status can be visually grasped.

In the above embodiments, the AE pickup 1 is placed at the position shown in the drawings, but as described above, the present invention is of course not limited thereto. Further, the means for transmitting the electrical signal of the AE pickup 1 is not limited to radio waves or optically modulated waves. Furthermore, although a jig grinding machine has been described in this embodiment, the present invention is not limited thereto.

[0009]

[Effects of the Invention] According to the present invention, the following effects can be achieved. (1) Since the AE pickup, its transmitting section, and receiving demodulating section are connected wirelessly, there is no interference in the mounting position caused by lead wires as in the prior art. (2) Since the arrangement positions of the AE pickup and the reception demodulator can be set arbitrarily, it becomes possible to arrange the AE pickup at the most effective location. Thereby, a highly accurate AE signal can be obtained. (3) The technology of transmitting the electric signal of the AE pickup as a radio wave or optically modulated wave is already commonly used and can be implemented relatively easily and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a partial front view of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a front view of a conventional AE pickup device.

[Explanation of symbols]

1 AE pickup 2 Transmission section 3 Reception demodulation section 4 Earphones 5 AE converter 6 CPU 7 CRT 8 Work 9. Whetstone 10　Moving table 11 Quill 12 Spindle head 13 Lead wire

Claims (1)

[Claims] [Claim 1] A on the fixed side near the work or processing tool.
A transmitting section for transmitting detection signals of the E pickup and the AE pickup as radio waves or optical modulated waves is disposed, and an amplifier receiving section for receiving the waves transmitted by the transmitting section is provided at a position separated from the AE pickup. Features a wireless AE pickup device.