SU1002816A1 - Method and device for measuring article length - Google Patents

Description

(54) METHOD OF MEASUREMENT OF LENGTH OF PRODUCTS AND DEVICE FOR ITS IMPLEMENTATION

one

The invention relates to non-destructive testing and can be used to determine the length of moving extended products, as well as the coordinates of defects in metallurgy.

A known method for determining the length of moving articles and a device for its implementation, according to which magnetic marks are applied to the item at measured intervals and these marks are read, and the length of the item is judged by the number of marks 1.

The disadvantage of this method is the impossibility of its use for non-magnetic materials.

Closest to the invention is a method for measuring the length of products, which consists in introducing ultrasonic oscillations into the product, measuring the delay time of the echo signal reflected from the opposite side of the product, and judging by its magnitude the length of the product.

A device that implements the method contains a series-connected synchronizer, generator, ultrasonic transducer.

amplifier, time meter and shadikator. 2

The disadvantage of the method and the implementing device is the impossibility of measuring the length of the moving extended products, since the base is continuously changing.

The purpose of the invention is to make it possible to measure the length of a moving extended product.

The goal is achieved by the fact that according to the method of measuring the length, which consists in introducing ultrasonic vibrations into the product, the delay time of the echo signal reflected from the opposite side of the product is measured, and its value is judged by the length of the product The acoustic signal is applied to the product with an acoustic mark in the form of a drop of damping fluid.

Device for measuring the length of products

Claims (2)

20 comprising in series a synchronizer, a generator, an ultrasound transducer, an amplifier, a time interval meter and an indicator, is equipped with a time summation unit, connected between the time interval meter and the indicator, and an acoustic labeling unit connected to the output of the time interval block. The drawing shows a block diagram of a device for measuring the length of products. The device contains synchronizer 1 connected in series, generator 2, ultrasonic transducer 3, amplifier 4, meter 5 time intervals, block 6 summation of time intervals with acoustic labeling unit 7 connected to its outputs and the indicator 8. The essence of the method consists of the following. It is known that when ultrasonic oscillations propagate over the surface of the product in places where boundary conditions are violated, for example, density changes, the presence or absence of any stress components, ultrasonic vibrations are reflected. When applying an acoustic mark on the surface of a moving product and excitations of ultrasonic vibrations in the direction of motion of the product, the current value of the duration of the echo signal reflected by the mark exactly corresponds to the path passed by the tag and the product, taking into account its speed. Summarizing the time intervals between adjacent, successively marked marks, one can judge about the length of the product at each moment of time, for example, when determining the coordinates of defects, and about the total length of the product. The method with the device is carried out as follows. Synchronizer 1 generates a pulse train. With a frequency of which the generator 2 excites by ultrasound transducer 3 in the product ultrasonic oscillations. At the first moment of time, the echo signal from the end of the product, or from the first of the marked marks, is received by the ultra sound transducer 3 and after amplification in the amplifier 4 enters the meter 5 time intervals, then to the block 6 the sum of time intervals. When the end of the product or the first label of the selected measuring path passes, the 5 time intervals measured by the meter are stored in the summation unit 6 and simultaneously with the aid of the acoustic marking unit 7, the next label is applied to the product. In the same way, the process is repeated throughout the entire movement of the product. After passing the end of the product from block 6, the summation of time intervals in. indicator 8 transmits the sum of the time intervals between each of the labels to which the last of the values of the current time interval is added. Indicator 8 converts the measured time into a length reading. . The use of the method and device for its implementation allows to measure the length of moving extended products with high accuracy or to determine the coordinates of the defects found in the product. (Claim 1. The method of measuring the length of the products, which consists in introducing ultrasonic vibrations into the product, measuring the delay time of the echo signal reflected from the opposite side of the product and judging by its magnitude about the length of the product, characterized in that , in order to provide the possibility of measuring the length of a moving extended product, upon reaching a predetermined duration of the echo signal on the product, the nan / l acoustic label in the form of a drop of damping fluid. 2. A device for measuring the length of products containing The synchronously coupled synchronizer, generator, ultrasonic transducer, amplifier, time interval meter, and indicator, characterized in that, in order to enable measurement of the length of a moving long product, it is equipped with a time summation unit, connected between the time interval meter and the indicator, and the unit the application of acoustic labels connected to the output of the block of summation of time intervals. Sources of information taken into account in the examination 1. Kakheladze KG. Automatic measurement and calculation of rental parameters in a dynamic mode. Tbilisi, MetzNisraba, 1979. 2. The patent of England N 1323079, CL. H 4 D, 1973 (prototype).