RU2248568C1 - Apparatus for ultrasonic testing of tubes - Google Patents

Abstract

FIELD: non-destruction testing of tubes.

SUBSTANCE: apparatus includes bath; mechanism for filing bath with water and piezoelectric transducers; at least two mechanisms for clamping and centering transducers relative to lengthwise axis of tested tube; bath motion mechanism. Each mechanism for clamping and centering is in the form of framework to which transducers are secured; and system of shafts, levers, supports and stops. Each framework is provided with individual drive unit, for example in the form of pneumatic cylinder and it is hinge-mounted with possibility of plane-parallel motion in space depending upon diameter of tube and its real arrangement relative to bath axis. Bath has two chambers; in each chamber at least one framework with transducers is arranged. Mechanism for moving bath is in the form of cantilever type lifting apparatus having frame and upper and lower plates joined with frame; bracket supporting bath; screw with nut mounted on bracket and joined with shaft of reduction gear motor mounted on upper plate; guides joining upper and lower plates. Mechanism for filling bath with water includes hydraulic accumulators whose working cavities are communicated with bath and with water supply system; drive unit, for example in the form of pneumatic cylinders.

EFFECT: enhanced effectiveness and reliability of tube testing process.

5 dwg

Description

The present invention relates to the field of non-destructive testing of pipes and can be used in rolling production for metal flaw detection using piezoelectric transducers (PES) in the immersion version.

A known installation for non-destructive testing of pipes [1], containing a transport line with drive and non-drive modules and a scanning mechanism with transducers mounted on it.

A disadvantage of the known device is the inability to use piezoelectric transducers for scanning due to the lack of a water cushion necessary for their operation.

A device [2] is known in which the scanning mechanism consists of a plastic rim filled with liquid under pressure, moved along the surface of the controlled product with a finder rigidly connected to the axis and located a few centimeters from the surface of the rim.

A disadvantage of the known device is the inability to continuously monitor along the perimeter of the pipe.

A device [2] is known, which we selected for the prototype, with a complete immersion of the controlled pipe under the liquid level, made in the form of a short tank with two windows with rubber seals and a water supply system that includes a pump to provide the required water level in the immersion bath.

The disadvantages of the known device include the lack of mechanisms for centering and adjusting the bath in height and the exact installation of the transducer blocks relative to the longitudinal axis and the surface of the studied pipe depending on its diameter, as well as the use of a pump to control the water level in the bath.

The purpose of the invention is to increase the efficiency and reliability of pipe control.

This goal is achieved by the fact that the device for non-destructive testing of pipes containing a bath, a mechanism for filling a bath with water and piezoelectric transducers contains at least two mechanisms for clamping and centering the transducers relative to the longitudinal axis of the controlled pipe, a bath moving mechanism, each clamping and centering mechanism is made in in the form of a frame with transducers of a system of shafts, levers, supports and stops fixed to it, each frame is equipped with an individual drive, made, for example , in the form of a pneumatic cylinder, and mounted on hinges with the possibility of plane-parallel movement in space depending on the diameter of the pipe and the actual location relative to the axis of the bath, the bath is divided into two compartments, at least one frame with converters is installed in each compartment, the bath movement mechanism is made in in the form of a cantilever elevator comprising a body and upper and lower plates connected to it, a bracket with a bathtub installed on it, a screw with a nut mounted on the bracket and connected to the motor shaft an or-reducer mounted on the upper plate, the guides connecting the upper and lower plates, the mechanism for filling the bath with water is made in the form of hydraulic accumulators, the working cavity of which is connected to the bath and the water supply system, and the drive, made, for example, in the form of pneumatic cylinders.

The invention is illustrated in the drawings.

Figure 1 shows a view A (figure 2) is a top view of the device, figure 2 shows a section G-D (figure 1), figure 3 shows a section bb (figure 1), figure 2 .4 shows a view B (figure 2), figure 5 shows a schematic diagram of a mechanism for filling a bath with water.

The device comprises an immersion bath 1, divided into two compartments C and D by a partition 2, clamping and centering mechanisms of transducer blocks 3 and 4, containing frames 6 and 7, supports 8 and 9, shafts 10 and 11, levers 12 and 13, hinges 14 of levers , hinges 15 of the frame, pneumatic cylinders 16 for turning the levers 14, stops 17 for installing frames 6 and 7 relative to the axis of the pipe, the bath movement mechanism 1, made in the form of a cantilever elevator containing a frame 18, a top plate 19, a bottom plate 20, a screw 21, a nut 22, guides 23, gearmotor 24 connected to screw 21, bracket 25 s installed bath 1, the mechanism for filling the bath with water, made in the form of hydraulic accumulators 26, equipped with actuators made in the form of pneumatic cylinders 27, pressure cavities E and C (Fig. 5) of the accumulators are connected to the bath 1 and the water supply system 28, and pneumatic cylinders 27 connected to the compressed air line 29, the automation system 30 (conventionally shown in FIG. 5), a spare tank 31 with water.

The device operates as follows.

The controlled pipe 32 is fed into the bath 1, the gear motor 24 is turned on and the bath with the frames 6 and 7 and the converters 3 and 4 are brought to the surface of the pipe 32. The axis of the frames with the converters is aligned with the axis of the pipe entering the bath with an eccentricity 17 manually once for a given pipe size. The final clamping of the frames with the converters to the pipe surface is carried out when the pneumatic cylinders 16 are turned on and the levers 14 are turned due to the plane-parallel movement of the frames in space in the hinges 14 and 15 at the angles α and β. Further, from the reserve tank 31, water is supplied to the bath 1. The water level in the bath 1 is regulated, the water is raised to level I, which ensures the operation of the converters, by means of hydraulic accumulators 26 by supplying compressed air from the system 29 under the pistons 33 of the hydraulic accumulators 26. The drive is turned on feed pipe 32, which, moving through the bath 1, performs a rotational movement (the mechanism of rotation and movement of the pipe is not conventionally shown). When the transducer blocks are turned on, ultrasonic testing is performed. When the pipe 32 exits the bathtub 1, the level I of water in the bathtub is reduced to level II, the frames 6 and 7 with the transducers 3 and 4 together with the bathtub 1 are lowered to their original position with the help of pneumatic cylinders 16 and the control process is repeated when the next pipe is fed into the bathtub . During operation, the water from the bath 1 is continuously sent to the drain water supply 34.

Used sources

1. RU No. 17988 dated 05/10/2001. Installation for non-destructive testing of pipes.

2 I. Krautkremer, G. Krautkremer. Ultrasonic control of materials. Reference Edition. Translating to Russian language. M .: Metallurgy, 1991, pp. 343-340.

Claims (1)

A device for non-destructive testing of pipes containing a bath, a mechanism for filling a bath with water and piezoelectric transducers, characterized in that it contains at least two mechanisms for clamping and centering the transducers relative to the longitudinal axis of the controlled pipe and a mechanism for moving the bath, each clamping and centering mechanism is made in the form frames with converters mounted on it and systems of shafts, levers, supports and stops, each frame is equipped with an individual drive, made, for example, in the form pneumatic cylinder, and mounted on hinges with the possibility of plane-parallel movement in space depending on the diameter of the pipe and the actual location relative to the axis of the bath, the bath is divided into two compartments, at least one frame with converters is installed in each compartment, the bath movement mechanism is made in the form of a cantilever lift containing the frame and the upper and lower plates connected to it, a bracket with a bathtub installed on it, a screw with a nut mounted on a bracket and connected to the motor-reducer shaft ora mounted on the top plate, the guides connecting the upper and lower plates, the filling mechanism of bath water is in the form of hydraulic accumulators, which working chamber is connected to the tub and a water supply system and the actuator, made of, for example, in the form of cylinders.

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