RU2397491C1 - Method for ultrasonic inspection of cylindrical articles, including pipes and device for realising said method - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: measurement module with acoustic transducers is moved parallel the inspected pipe at the displacement speed of the pipe. At the beginning of inspection, the speed of the measurement module is synchronised with the speed of the inspected pipe, ensuring its movement with speed equal to the travelling speed of the pipe during one revolution of the pipe while completely inspecting the front end of the pipe using the first acoustic transducer. After that the measurement module is stopped and the surface of the pipe is completely inspected on a spiral until the moment the front end of the pipe approaches the second acoustic transducer. The speed of the measurement module is again synchronised with the travelling speed of the pipe while completely inspecting the front end of the pipe using the second acoustic transducer. After that the measurement module is stopped and the pipe is inspected on a spiral until the moment the front end of the pipe approaches the third acoustic transducer and so on, depending on the number of acoustic transducers of different functional purposes installed on the measurement module. At the end of scanning the front end of the pipe, the measurement module is returned to the initial mark and when the rear end of the pipe approaches, the same sequence of moving and stopping the measurement module when inspecting the front end of the pipe is repeated.

EFFECT: complete inspection of pipes in compound motion on rollers.

2 cl, 21 dwg

Description

The present invention relates to the field of non-destructive quality control of products of the metallurgical industry using acoustic transducers, eddy current method or magnetic dispersion method, and can be used in ultrasonic testing of cylindrical products, including pipes, moving along a rolling table rotational-translationally.

A known method of ultrasonic flaw detection of cylindrical products and a device for its implementation, which includes the excitation of an ultrasonic wave pulse in the product, the implementation of the multiple passage of this pulse along the perimeter of the cross section, changing the energy of the signals [1].

A known device for ultrasonic flaw detection includes a combined bi-directional transducer and connected in series with an ultrasonic flaw detector and a processing circuit, an amplifier, a unit for measuring informative parameters and a decision block, a roller table, a magnetization device, a block of electromagnetic-acoustic converters and an oscillation generator [1].

A disadvantage of the known technical solution is the impossibility of determining the location of the product and, in particular, its position relative to electromagnetic-acoustic transducers. As a result, during the mutual movement of the product and the electromagnetic-acoustic transducer (hereinafter referred to as the transducer), their collision and its damage can occur. In the absence of accurate data on the position of the front and rear ends of the product, the uncontrolled area may increase.

Also known is a technical solution for non-destructive testing of pipes, containing a transport line with drive and non-drive rollers, a scanning mechanism with transducers installed on it, connected to a flaw detector, a control unit, a control unit, a unit for storing and presenting information, a measuring instrument for moving the controlled pipe, a register of scanning coordinates , multichannel marker [2].

A disadvantage of the known technical solution is the impossibility of accurately determining the position of the defect relative to the transducers and the marker after passing the control object (end section of the bar) outside the displacement meter. In addition, the inability of the reliable protection of the converters from damage during the passage of the object of control also relates to the disadvantage of the known technical solution.

A known method of non-contact ultrasonic testing of long products and pipes, including moving the control object through the scanning mechanism with the transducers installed on it, measuring the movement of the control object, adding and comparing the signals received from the transducers to the control unit, determining the coordinates of the scan, transmitting commands to trigger the marker, which control the movement of the front and rear ends of the control object, the position of the transducers relative to the surface of the object monitoring, defect position detected by the transducer, is accomplished by supplying their approach when the front end of the control object and outlet at the moment approaches the rear end of a control object, wherein the supply and removal is performed by commands from the control unit [3].

The known device for ultrasonic pipe inspection contains a transport line with drive and non-drive rollers, a scanning mechanism with converters, a displacement meter of the controlled object in the form of an optical sensor, a program control unit and a multi-channel marker, several transducer blocks and displacement meters of the front and rear ends of the control object located along its movement with fixed distances relative to the coordinate axes, the intersection point of which lies on the axis of the opt sensor, the transducers are equipped with mechanisms to raise and lower the surface of the test object when it passes under the transducers, displacement meters are made in the form of rollers in contact with the test object, the axes of which are mounted rotation angle sensors of the rollers that convert mechanical rotation into electrical signals received by the control unit , and their position and marker position have fixed values relative to the origin [3].

A common drawback of the known methods and devices of ultrasonic testing of round-rolled products and pipes is the presence of uncontrolled sections at the objects of control from the ends, which reduces the quality of control of pipes, especially at the locations of the chamfers.

An analysis of the current situation in the world shows that for the implementation of ultrasonic inspection of pipes, several types of acoustic transducers (APs) are currently used. A prerequisite for all types of AP is contact with the surface of the pipe. Therefore, as a rule, they use a mechanical drive lever, which lowers the AP to the pipe surface at its front end and raises the AP when it reaches the rear end of the pipe [1-3].

Currently, when conducting ultrasonic testing of pipes moving along the rolling tables of rotational-translational movement, the following method of ultrasonic testing is used.

The pipe moves in a rotational-translational manner, and the measuring module (IM), on which one or several APs are fixed, stands motionless. At the same time, APs can only move vertically, dropping down onto the pipe or rising from it [1-3].

Lowering the AP occurs as follows. When a sensor specially designed for pipe detection detects that the AP is above the pipe, the AP is lowered. At the end of the pipe, when the sensor determines that the pipe has reached the AP with its rear end, the AP will rise.

In this case, uncontrolled areas arise, the so-called triangular uncontrolled zones (TNZ, figure 1).

If you look at the scan of the pipe, controlled in this way, then clearly visible triangular uncontrolled zones. Moreover, both at the front and at the rear end of the pipe (figure 2).

At the rear end of the pipe, such an uncontrolled zone is obtained because when the end of the pipe reaches the AP size, it must be lifted, otherwise the extreme supports of the AP will come off the pipe and the AP will be damaged (Fig. 3). The aim of the invention is to provide a method for conducting ultrasonic testing of pipes moving along the rolling tables rotationally-translationally, which would provide 100% control of the pipes.

This goal is achieved by the fact that in the method of ultrasonic testing of cylindrical products, including pipes, including rotational-translational movement along the live rolls, scanning using a measuring module equipped with acoustic transducers, at least one measuring module with one or more acoustic transducers, move parallel to the controlled object, such as a pipe, with the speed of movement of the control object, while at the beginning of control synchronize the speed of change the measuring module with the speed of the pipe being controlled, ensuring its movement at a speed equal to the translational speed of the pipe during one revolution of the pipe, controlling the first acoustic transducer of 100% of the front end of the pipe, then stop the measuring module and then conduct 100% control of the pipe surface, according to spirals until the front end of the pipe approaches the second acoustic transducer, after which they again synchronize the speed of the measuring module with the speed of the translational movement of the pipe, by controlling the second acoustic transducer 100% of the front end of the pipe, then the measuring module is stopped and then the pipe is controlled in a spiral until the front end of the pipe approaches the third acoustic transducer, and so on, depending on the number of acoustic transducers of different functionalities installed on the measuring module, after scanning end of the front end of the pipe, return the measuring module to its original mark, and when approaching the rear end of the pipe again syn they’re dropping the speed of the measuring module with the translational speed of the pipe being monitored, and moving it in the direction of the pipe’s movement at a speed equal to the pipe’s speed for one revolution of the pipe, controlling 100% of the rear end of the pipe with one or more acoustic transducers, repeating the same sequence of movements and stops of the measuring module, performed during the control of the front end of the pipe.

A device for ultrasonic testing of cylindrical products, including pipes, containing a roller table, a measuring module with acoustic transducers, a mechanism for rotational-translational movement of pipes, mechanisms for raising and lowering acoustic transducers, a pipe tracking system, made in the form of a frame on which at least one measuring module with the possibility of reciprocating movements and stops according to the commands of the tracking system, equipped with one or more acoustics sensors, with different functional purposes, the tracking system, which is a set of sensors and other means of automation, is configured to ensure the movement of at least one measuring module with one or more acoustic transducers parallel to the controlled object, such as a pipe, with the speed of movement of the control object at the same time, at the beginning of the monitoring, the tracking system provides synchronization of the speed of the measuring module with the speed of the controlled t pipes and its movement at a speed equal to the translational speed of the pipe during one revolution of the pipe, control by the first acoustic transducer 100% of the front end of the pipe, stop the measuring module and then 100% control of the pipe surface in a spiral until the front end of the pipe approaches the second acoustic transducer, after which it again provides synchronization of the speed of the measuring module with the speed of the translational movement of the pipe, control by the second acoustic transducer of 100% of the front end of the pipes s, stopping the measuring module and checking the pipe in a spiral until the front end of the pipe approaches the third acoustic transducer, and so on, depending on the number of acoustic transducers of different functionalities installed on the measuring module, after the scanning of the front end of the acoustic transducers by scanning, the tracking system provides return the measuring module to its original mark, and when approaching the rear end of the pipe provides speed synchronization of the module with the translational speed of the controlled pipe, and moving it in the direction of the pipe’s movement at a speed equal to the pipe’s speed during one revolution of the pipe, monitoring 100% of the rear end of the pipe with one or more acoustic transducers, and repeating the same sequence of algorithms for moving and stopping the measuring module performed by her while monitoring the front end of the pipe. This achieves 100% control of the entire pipe surface, without uncontrolled zones.

As an example of the proposed method, the following is a description of the ultrasonic inspection of the pipe using a measuring module (IM) equipped with acoustic transducers (AP).

BLUEPRINTS

Figure 1 - trajectory AP with rotational-translational movement of the pipe.

Figure 2 - the surface that passed control during the movement of the pipe under the AP.

Figure 3 - uncontrolled area at the rear end of the pipe.

Figure 4 - the surface that passed control during the movement of the pipe under the AP.

Figure 5 - measuring module (MI) expects the pipe, being in its original position, with the raised acoustic transducers.

6 - when the front end of the pipe reaches the tracking system (CC), the translational speed of the pipe is automatically determined.

7 - at the moment determined by the tracking system, AP1 falls to the front end of the pipe. The measuring module starts moving at a speed equal to the translational velocity of the pipe.

Fig.8 - the pipe continues to move in a rotational-translational manner.

Fig.9 - after lowering AP2 on the pipe, the measuring module starts moving at a speed equal to the speed of the pipe.

Figure 10 - after the pipe has made one revolution, the measuring module stops, Vm = 0. In this case, the pipe continues to move rotationally-translationally with a speed of Vt.

11 - after lowering the AP3 on the pipe, the measuring module starts moving at a speed equal to the speed of the pipe.

Fig - after the pipe has made one revolution, the measuring module begins to move in the opposite direction, with a speed of V.

Fig - return MI to its original position.

Fig - after returning to its original position, the measuring module is stopped. After returning to the initial position, the measuring module stops.

Fig - when AP1 is at the rear end of the pipe, the measuring module begins to move in the direction of movement of the pipe at a speed equal to the speed of the pipe.

Fig.16 - after the pipe has made one revolution, the measuring module stops. In this case, the pipe continues to move rotationally-translationally.

Fig - at the moment when AP2 is at the rear end of the pipe, the measuring module starts moving at a speed equal to the speed of the pipe.

Fig. 18 - after the pipe has made one revolution, the measuring module stops. In this case, the pipe continues to move rotationally-translationally.

Fig - at the moment when the AP3 is at the rear end of the pipe, the measuring module begins to move at a speed equal to the speed of the pipe.

Fig.20 - the controlled pipe is transported by a rolling table further along the technological cycle. The measuring module returns to its original position.

Fig - after returning to its original position, the measuring module stops and awaits the next pipe for ultrasonic testing.

The essence of the proposed method for ultrasonic testing of cylindrical products, such as pipes, with rotational-translational movement along the roller table

The method consists in the fact that acoustic transducers (AP), in an amount from one to "n", are able to move along the pipe, synchronously with the pipe. To do this, the APs are fixed on the measuring module (MI), which moves along the rails using an electric drive with frequency control. The speed of movement of MI along the rails is adjustable and automatically adjusts to the translational speed of the pipe. This avoids the displacement of the AP relative to the pipe at the first revolution of the pipe. This completely eliminates the triangular uncontrolled area. The scan of the pipe thus controlled looks like that shown in FIG. 4.

Description of the method of ultrasonic testing of cylindrical products, for example pipes, without uncontrolled zones and the operation of the device, for example, with three acoustic transducers

The measuring module (MI) expects the pipe, being in the initial position, with the raised acoustic transducers (Fig. 5), where 1 is the acoustic transducer AP1, 2 is the acoustic transducer AP2, 3 is the acoustic transducer AP3, CC is the pipe tracking system. The pipe moves in a rotational-translational manner, with a translational speed VТ and a rotational speed equal to the control speed specified in the relevant standards governing the ultrasonic testing. When the front end of the pipe reaches the tracking system (CC), the translational speed of the pipe is automatically determined (Fig. 6). The pipe tracking system is a set of sensors and other automation tools that allows you to determine the position of the pipe end at each moment in time, as well as calculating the translational speed of the pipe.

The result of the tracking system is to determine the exact moment of lowering the AP to the front end of the pipe and their lifting from the rear end of the pipe. The tracking system also determines the necessary velocity of the measuring module Vm to achieve its synchronism with the speed of the pipe Vt.

At the moment determined by the tracking system, AP1 drops to the front end of the pipe. The measuring module starts moving at a speed equal to the translational velocity of the pipe (Fig.7).

The equality of the speeds Vm and Vt allows the acoustic transducer AP1 to control the entire end of the pipe around the circumference without an uncontrolled zone for one revolution.

After the pipe has made one revolution, the measuring module stops. In this case, the pipe continues to move in a rotational-translational manner (Fig. 8).

From this moment, the acoustic transducer AP1 is controlled in a spiral until the pipe is the front end at the lowering point of the AP2. After lowering the AP2 to the pipe, the measuring module begins to move at a speed equal to the speed of the pipe (Fig.9).

The equality of the speeds Vm and Vt allows the AP2 acoustic transducer to control the entire end of the pipe around the circumference without an uncontrolled zone for one revolution.

After the pipe has made one revolution, the measuring module stops, Vm = 0. In this case, the pipe continues to move in a rotational-translational manner with a speed Vt (Fig. 10). Further, the control of acoustic transducers AP1 and AP2 is carried out in a spiral until the pipe is the front end at the lowering point of the AP3. After lowering the AP3 to the pipe, the measuring module starts moving at a speed equal to the speed of the pipe (Fig. 11). The equality of the speeds Vm and Vt allows the AP3 acoustic transducer to control the entire end of the pipe around the circumference without an uncontrolled zone for one revolution.

After the pipe has made one revolution, the measuring module begins to move in the opposite direction, with a speed of V. At the same time, the pipe continues to rotate-translate. This allows the measuring module to return to its original position during the spiral control of the main body of the pipe by acoustic transducers AP1, AP2 and AP3 (Fig. 12).

The MI return to the initial position is necessary to create a power reserve that will provide the ability to synchronize the speeds Vm and Vt when controlling the rear end of the pipe, where V is the MI return speed to the initial position (Fig. 13).

Further, the control of acoustic transducers AP1, AP2 and AP3 is carried out in a spiral until the pipe is the rear end under the pipe tracking system. After returning to the initial position, the measuring module stops (Fig. 14).

The tracking system determines the location of the rear end of the pipe and the translational speed of the pipe.

At the moment determined by the tracking system, when AP1 is at the rear end of the pipe, the measuring module starts moving in the direction of movement of the pipe at a speed equal to the speed of the pipe (Fig. 15). The equality of the speeds Vm and Vt allows the acoustic transducer AP1 to control the entire rear end of the pipe around the circumference without an uncontrolled zone for one revolution. After the pipe has made one revolution, the measuring module stops. In this case, the pipe continues to move in a rotational-translational manner (Fig. 16).

AP1 rises. Further, the control is carried out in a spiral acoustic transducers AP2 and AP3, until the AP2 is at the rear end of the pipe.

At the moment when AP2 is at the rear end of the pipe, the measuring module starts moving at a speed equal to the speed of the pipe (Fig. 17).

The equality of the speeds Vm and Vt allows the AP2 acoustic transducer to control the entire end of the pipe around the circumference without an uncontrolled zone for one revolution.

After the pipe has made one revolution, the measuring module stops. In this case, the pipe continues to move in a rotational-translational manner (Fig. 18). AP2 rises. Further, the control is carried out in a spiral acoustic transducer AP3, until the AP3 is at the rear end of the pipe.

At the moment when AP3 is at the rear end of the pipe, the measuring module starts moving at a speed equal to the speed of the pipe (Fig. 19).

The equality of the speeds Vm and Vt allows the AP3 acoustic transducer to control the entire end of the pipe around the circumference without an uncontrolled zone for one revolution.

After the pipe has made one revolution, the AP3 rises. Pipe inspection is complete. The controlled pipe is transported by the rolling table further along the technological cycle. The measuring module returns to its original position (Fig.20).

After returning to its original position, the measuring module stops and waits for the next pipe to conduct ultrasonic testing (Fig.21). The device (Fig.21) contains one or n - acoustic transducers AP 1, 2, 3 ... n, frame 4, roller table 5, guides 6, at least one measuring module 7 mounted on the carriage 8, tracking system 9 for movement pipe 10, as well as mechanisms for moving the pipe 10 along the roller table 5, the measuring module 7 along the guides 6, raising and lowering the AP 1, 2, 3 ... n (the mechanisms are not shown conditionally).

The advantages of the new method

Unlike the known method of ultrasonic testing of cylindrical products, including rotational-translational pipes along the live rolls, in which the AP does not have the ability to move synchronously with the pipe, the proposed method allows you to completely eliminate uncontrolled zones at the front and rear ends of the pipe.

Information sources

1. Patent of the Russian Federation No. 2146363.

2. RF patent No. 17988.

3. RF patent No. 2238553.

Claims (2)

1. The method of ultrasonic testing of cylindrical products, including pipes, including rotational-translational movement of pipes along the live rolls, scanning pipes using a measuring module equipped with acoustic transducers, characterized in that at least one measuring module with one or more acoustic the transducers move parallel to the controlled object, for example, a pipe with the speed of movement of the control object, while at the beginning of the control synchronize the speed of the measuring of the module with the speed of the pipe being controlled, ensuring its movement at a speed equal to the translational speed of the pipe for one revolution of the pipe, controlling the first acoustic transducer of 100% of the front end of the pipe, then stop the measuring module and then conduct 100% pipe surface control in a spiral until the front end of the pipe approaches the second acoustic transducer, after which the speed of the measuring module is again synchronized with the speed of the translational movement of the pipe, the second acoustic transducer 100% of the front end of the pipe, after which the measuring module is stopped and then the pipe is controlled in a spiral until the front end of the pipe approaches the third acoustic transducer, and so on, depending on the number of acoustic transducers of different functionalities installed on the measuring module, after scans of the front end of the pipe return the measuring module to its original mark, and when the rear end of the pipe approaches the speed of the measuring module with the translational speed of the controlled pipe and moving it in the direction of movement of the pipe at a speed equal to the speed of the pipe during one revolution of the pipe, controlling 100% of the rear end of the pipe with one or more acoustic transducers, repeating the same sequence of movements and stops of the measuring module, performed when monitoring the front end of the pipe. 2. A device for ultrasonic testing of cylindrical products, including pipes, containing a roller table, a measuring module with acoustic transducers, a mechanism for rotational-translational movement of pipes, mechanisms for raising and lowering acoustic transducers, a tracking system for pipe movements, characterized in that it is made in the form of a frame on which at least one measuring module is installed with the possibility of reciprocating movements parallel to the object of control and stops by commands a tracking system equipped with one or more acoustic transducers with different functional purposes, a pipe movement tracking system, which is a set of sensors and other automation means, is configured to ensure the movement of at least one measuring module with one or more acoustic transducers in parallel to the controlled an object, for example, a pipe with a speed of movement of the object of control, while at the beginning of the control the tracking system provides It synchronizes the speed of the measuring module with the speed of the pipe being monitored and moving it at a speed equal to the translational speed of the pipe during one revolution of the pipe, controlling the first acoustic transducer to 100% of the front end of the pipe, stopping the measuring module and then 100% controlling the pipe surface in a spiral the moment the front end of the pipe approaches the second acoustic transducer, after which it again provides synchronization of the speed of the measuring module with the speed of translational motion pipes, monitoring by the second acoustic transducer 100% of the front end of the pipe, stopping the measuring module and checking the pipe in a spiral until the front end of the pipe approaches the third acoustic transducer, and so on, depending on the number of acoustic transducers of different functionalities installed on the measuring module, after scanning by the acoustic converters of the front end of the pipe, the tracking system ensures the return of the measuring module to its original mark, etc. and the approach of the rear end of the pipe synchronizes the speed of the measuring module with the translational speed of the controlled pipe and moves it in the direction of movement of the pipe with a speed equal to the speed of the pipe during one revolution of the pipe, 100% control of the rear end of the pipe by one or more acoustic transducers and the repeatability of the same the sequence of algorithms for moving and stopping the measuring module performed by it when monitoring the front end of the pipe.

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