JPS5931447A - Spalling detector for steel plate - Google Patents

Abstract

PURPOSE:To check whether the steel plate and viscous sheet of a damping steel plate spalled from each other securely and easily, by providing a detector constituted by stacking a force sensor and a vibration sensor, an amplifier, a BPF, and a divider. CONSTITUTION:The detector 1 is attracted by a magnet 5 at a specific position on the damping steel plate 12 wherein the viscous sheet 11 is sandwiched. The detector 1 is given an impact with a hammer 13. Consequently, the force sensor 2 of the detector 1 outputs a signal indicating the value of the impact force and the vibration sensor 3 outputs a signal indicating the value of vibration that the steel plate 12 receives by the impact. Those output signals are amplified by the amplifier 6 to specific levels and only output signals of specific effective bands are sent from the BPF 7 to a divider 8, which compares both signals to each other to calculate the mechanical impedance of the steel plate 12. This calculated value is compared with a reference value by a comparator 9 and when the calculated value is greater than the reference value, that is displayed 12, detecting the separation.

Description

[Detailed description of the invention] The present invention relates to a peeling detection device for a steel plate.

In recent years, for example, a viscoelastic sheet such as rubber or plastic is pasted between two 41ω (jk) to prevent the generation of noise due to vibration. A so-called composite damping 611'' plate is used.

In the vibration-damping steel plate described above, the steel plate and the viscoelastic sheet are not completely bonded to each other (X), and the function ff cannot be maximized.

Conventionally, methods for non-destructively testing the adhesion of plate-like members that are bonded together include: (1) A method in which ultrasonic waves are applied to the steel plate to be inspected and peeled portions are detected by the reflected echo; (2) , a temperature pattern method in which the steel plate to be inspected is heated and peeled areas are detected based on the temperature difference between the peeled area and the adhered area.

(2) There is a method of applying vibration to the JLJ plate to be inspected and optically measuring the vibration on the surface of the steel plate to detect a peeled portion.

However, applying the methods (1) and (2) above to detecting the peeling of the damping steel plates is difficult because the method 1. The physical properties such as specific gravity and thermal conductivity of the notebook are similar to those of the steel plate.
It is impossible because j is different.

In addition, (2) is a major loss of equipment, making it difficult to install on an actual line and requiring high equipment costs.

This invention was made to solve the above-mentioned problems, and is made by combining a force sensor that detects impact force and a vibration sensor that detects vibrations caused by the impact force. a detector, an amplifier for amplifying the force and vibration output signals detected by the detector to predetermined magnitudes, and the amplifier "1";
a bandpass filter that passes only the output signal in the effective band among the force and vibration output signals amplified by the device;
The device calculates the ratio of the output signal values of the various vibrations that have passed through the band-pass filter, and calculates the mechanical impedance (I Detecting the presence or absence of peeling by comparing it with '1, lj has characteristics.

This invention will be explained by way of examples and with drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, 1 is a force sensor 2 that detects impact force;
This is a detector consisting of a JI+Q dynamic sensor that detects the vibration of damping steel plates due to impact force.

A protective member 4 is fixed to the upper part of the force sensor 2, and a magnet 5 is fixed to the -1 section of the vibration sensor 3, and the detector 1 is attracted and fixed to the test piece Q by the magnet 5. I can do it.

Reference numeral 6 denotes an intensifier that increases the output signal from the force sensor 2 and the output signal from the vibration sensor 3 of the detector 1 to a predetermined magnitude.

Reference numeral 7 denotes a bandpass filter that passes only signals in the effective band among the output signal from the force sensor 2 and the output signal from the vibration sensor 3 amplified by the amplifier 5. The effective band means that in the low frequency range of several hundred Hz or less, the output signal will be unstable depending on the detection position, etc., and on the other hand, in the high frequency range of several KHz or more, the output signal will have an unstable value. 30'0-3 KI4 as it is affected by the method etc. and it is not possible to obtain a stable detection value.
The range is about z.

Reference numeral 8 denotes a divider for taking the signal from the force sensor 8 that has passed through the band-pass filter 2 and the signal to-to-toe ratio from the vibration sensor 3 to detect the temporary mechanical impedance assigned.

Reference numeral 9 denotes a comparator for comparing the mechanical impedance value calculated by the divider 8 with the reference value, that is, the mechanical impedance value of the steel plate without peeling.

Reference numeral 10 denotes a display for displaying the results of comparison by the comparator 9.

Next, the operation of the detection device of the present invention having the above configuration will be explained.

As shown in FIG. 2, the detector 1i is attracted by the magnet 5 to a predetermined position on the divided steel plate 12 in which the viscoelastic /-) 11 is sandwiched. Then, an impact is applied to the detection 2 by the non-mer 13. Therefore, a signal indicating the magnitude of the impact force is output from the force sensor 2 of the detector 1, and a signal indicating the magnitude of the vibration received by the vibration sensor 3 and the steel plate [2] is output from the force sensor 2. "+F'j is output i.

These output signals are each increased by +1- to a predetermined size by an intensifier 6, and then passed through a bandpass filter 7.
Therefore, only the output signal in the predetermined effective area 17 is sent to the divider 8.
Here, the ratio of both signals is taken and +1llfl
The mechanical impedance of Jiv 12 is calculated. This calculated mechanical impedance value is compared with a reference value by a comparator 9, and the calculated mechanical impedance value ii'j
If the value exceeds the reference value (Y) is displayed on the 1 display 12, peeling is detected.

As explained above, the present invention brings about the useful effect that it is possible to reliably and easily inspect the presence or absence of peeling between the steel plate and the viscoelastic sheet in the damping steel plate.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing how the same is used. In the drawing - ■... Detector 2... Kasenza 3... 1 Rotational sensor 4... Protective member j5 Magnet
6. Amplifier 7... Band pass filter 8.
...ll'j )

Claims (1)

[Scope of Claims] Detectors that combine a force sensor that images an impact force and a vibration sensor that detects force exerted by the impact force. an intensifier 11' for amplifying the force and vibration output signals detected by the detector to predetermined magnitudes, respectively; A bandpass filter that passes only the output signals in the effective band among the force and vibration output signals increased by the increase IllA'4. It has a divider that calculates the mechanical impedance of the steel plate by taking the ratio of the force and vibration output signal values that have passed through the band-pass filter, and compares the mechanical impedance value calculated by the divider with a reference value. A steel 4JK English J seat 11 detection device is characterized in that the presence or absence of peeling of a steel plate can be inspected by this.