JPS5967427A - Impactor for calibration of impact signal - Google Patents

Abstract

PURPOSE:To achieve an accurate estimation of the shape and the weight of an object with an impact signal by providing a detector for detecting an impact signal from the impact of objects with a calibration impactor to output an impact signal as reference accurately with ease. CONSTITUTION:For example, a detector 2 and an impactor for calibration of impact signals are arranged on the circumferential surface of a pressure vessel 1 of a nuclear reactor at a fixed interval (l). Under such a condition, the tip of an elastic body 8 is lifted by a certain distance X so that the tip of an impact section 6 may impact the pressure vessel 1 of the nuclear reactor by a resilience of the elastic body 8 to generate an impact signal as reference in the impact section. This impact signal is detected with a detector 2. Therefore, the relationship can be learned accurately between the impact signal as generated, for example, when an object 4 such as bolt impacts a baffleplate 5 and the impact signal as detected with the detector 2 separated by l from the impact point thereby enabling the calibration of the detector 2. Thus, the estimation of the weight and shape of an object by an impact signal can be done accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an impact device for calibrating an impact signal that applies a reference impact to a detector that detects an impact signal caused by a collision of an object.

``Technical Background of the Invention'' Recently, in order to detect and evaluate objects that have slipped into containers or piping, etc., it is necessary to use detectors such as accelerometers and speedometers to detect and evaluate impact signals caused by collisions between objects and containers or piping. detect,
Evaluate the weight ω, shape, etc. of the object in a definite manner (illi ”4
Attempts are being made to

FIG. 1 shows a boiling water nuclear reactor, and in the figure, reference numeral 1 indicates a reactor pressure vessel.

On the side surface of the reactor pressure vessel 1, there are a plurality of
A detector 2 is installed, and this detector 2 detects when an object 4 such as a bolt or nut falls off from equipment installed around the reactor core 3 and collides with a baffle plate 5, for example. , an impact signal generated by the collision between this object 4 and the baffle plays 1 to 5 is detected.

Then, the weight, shape, etc. of the object 4 are estimated from the waveform, frequency, etc. of the impact signal detected by the detector 2.

[Problems with the Background Art] However, generally, as shown in FIG. 1, the impact signal propagates through the baffle plate 5 and the reactor pressure vessel 1 and is detected by the detector 2, so it is difficult to eliminate the influence of these media. It is difficult to reliably determine the weight, shape, etc. of an object from the impact signal detected by the detector 2.

That is, in general, an impact signal is attenuated depending on the distance it propagates, and this attenuation is influenced in a complex manner by structural factors such as the thickness of the media. Therefore, in order to estimate the impact force at point tF1 from the vh multiplier signal detected by detector 2, the 7j rated impact of the calibration of detector 2 is added to the impact point in advance. , the impact signal caused by the impact i~ is detected by the detector 2, and the impact signal is ratedly evaluated based on the correlation between a certain quantitative impact and the detected signal, and the weight, shape, etc. of the object are accurately determined. is possible.

[Object of the Invention J The present invention has been made in response to such conventional circumstances,
It is very important to reliably and easily output a reference impact signal to a detector that detects an impact signal caused by a collision with an object. The present invention aims to provide an impact device for calibrating the i-impact signal.

F Summary of the Invention J In other words, the present invention provides an impact section that outputs a reference impact signal to a detector that detects an impact signal caused by a collision of an object;
The impact device for calibrating impact signals is characterized by comprising a support section that supports the impact section via an elastic body.

[Embodiment of the Invention] The details of the present invention will be described below with reference to the drawings.

FIG. 2 shows an impact device for calibrating impact signals according to an embodiment of the present invention, and in the figure, reference numeral 6 indicates an impact portion having a tapered curved surface 7 at the tip thereof.

The impact part 6 is fixed to the tip of an elastic body 8 having a rectangular cross section and having a constant spring constant, and the rear end of the elastic body 8 is supported by a support part 9 . This support part 9 is connected to an impact object 1, such as a nuclear reactor pressure vessel 1, to which an impact signal is to be applied, such as a magnet 6, a pole 1 to J, etc.
Fixed to 0.

However, in the impact device for impact signal calibration constructed in this way, the elastic body 8 has a constant spring constant k, so as shown in FIG. 2, i Nt x When the elastic body 8 is lifted upward by (1/2) k
x2 energy is mossed. Therefore, this distance x
Quantitatively determine.

The impact added by Zunawara Energy E
can be determined.

Figure 3 shows a state in which the detector 2 is calibrated using the acceleration t1 using such an impact device for calibrating the impact signal. A detector 2 and an impact device for calibrating impact signals are arranged with a distance therebetween.

By lifting the tip of the elastic body 8 by a certain distance 1i1x in this J state and causing the tip of the impact part 6 to collide with the reactor pressure vessel 1 by the restoring force of the elastic body 8, a shock signal with a constant M quasi is generated. This shock signal (from the detector 2)
detected. Therefore, it is necessary to reliably know the relationship between the impact signal at the impact point corresponding to an actual structure, such as the reactor pressure vessel 1, and the impact signal detected by the detector 2 located a distance from the impact point. It is possible to calibrate the detector 2, including its mechanical and structural characteristics.

[Effects of the Invention] As described above, according to the impact device for impact signal calibration of the present invention, an accurate impact signal for calibration can be reliably and easily outputted to the detector.

In the embodiments described above, the elastic body 8 consisting of a long portion
We have explained an example in which energy is stored in the elastic body 8 by utilizing the deflection of J, the elastic energy due to the rotational energy due to the rotation of the spring 13 as shown in Fig. 6, 1 as shown in Fig. 7.
J, using the expansion and contraction energy due to the expansion and contraction of the sea urchin round bar 14 (
It goes without saying that C may also be used so that the impact is applied to the til+72R portion.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a method for detecting a fallen object in a reactor pressure vessel, Fig. 2 is a longitudinal sectional view showing an impact device for calibrating an impact signal according to an embodiment of the present invention, and Fig. 3 An explanatory diagram showing a state in which the C detector is calibrated using the impact device for calibrating the impact signal shown in FIG. 2, and FIGS. It is a diagram. 2......Detector 6...Impact part 9...Support part 8...・・・・・・Elastic Body Representative Patent Attorney'/Page 111 France - Figure 1 and 2

Claims (1)

[Claims] (1) 1 due to collision of objects! 'fI8J impact signal calibration is characterized by consisting of an impact part that outputs an impact signal based on Qt to a detector that detects i-Gokui No. 5, and a support part that supports this impact part via an elastic body. Signal calibration counter