JPH0632618Y2 - Water immersion ultrasonic flaw detector for pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a water immersion ultrasonic flaw detection apparatus for flaw detection inspection of pipes.

(Prior art) As a method of detecting flaws from the outer surface of the pipe or measuring the dimensions,
There is a method in which a pipe to be inspected is conveyed in an axial direction while being rotated, and is inspected by one or a plurality of ultrasonic sensors fixedly provided, and among these, a method using water as a contact medium is often adopted. .

In this case, particularly when the pipe to be inspected is a small-diameter pipe, a method is generally used in which a water tank containing an ultrasonic sensor is provided in the middle of the transport path and the tube is passed through the water tank. When applying this method, in order to prevent water from entering the pipe and generating noise, first insert plugs such as rubber at both ends of the pipe, and then tap the water sealing means. The inspection is done. Further, as a means for rotating and conveying the pipe, a skew roller is used, and the means for changing the feed pitch is adjusting the skew angle of the roller.

(Problems to be Solved by the Invention) In the conventional method as described above, the plug body used as the water sealing means of the pipe end is manually inserted, and the attachment and detachment work requires labor and time. I was there. In addition, slip between the roller and the pipe cannot be avoided when the pipe is conveyed, and for example, a rotary encoder or the like is provided in the drive device of the skew roller to try to exactly match the flaw signal generation position and the flaw position of the pipe. However, this is practically impossible due to the slip phenomenon and the uneven rotation of the roller, and there is a problem that a phase shift occurs at the encoder detection position.

The present invention has been made to solve the above problems, and it is possible to change the feed pitch and feed speed separately from the means for moving in the pipe axis direction and the rotation driving means, and further to insert the plug automatically. It is an object of the present invention to provide a device that is capable of performing the functions of transmitting rotation drive and axial movement.

(Means for Solving the Problems) A water immersion ultrasonic flaw detector for a pipe according to the present invention comprises a water tank in which an ultrasonic sensor is housed and a hole for allowing passage of an inspection pipe in an axial direction is provided. , Along the guide rails provided parallel to the center of the transport path line of these tables, which supports the pipes to be inspected horizontally at the inlet and outlet sides of the water tank and allows their rotation and axial movement. A moving entrance side trolley and an exit side trolley, which are mounted on these trolleys, have an axis coincident with the center of the transport path line of the table, have a plug body that can be expanded and contracted by the action of fluid at the tip, and have the above inside A pipe support rod having a fluid supply passage to the stopper is provided with a pipe support mechanism rotatably supported with its tip facing the water tank, and rotational drive for rotating the pipe support rod of at least one pipe support mechanism of the carriage. Having a means Is the gist.

(Operation) The present invention has a water tank in which an ultrasonic sensor is housed and a hole is provided to allow passage of the pipe to be inspected in the axial direction, and the pipe to be inspected is horizontal in the inlet side and the outlet side of the tank. Tables that are supported and can rotate and move in the axial direction, entrance side trolleys and exit side trolleys that move along guide rails that are provided in parallel with the center of the transport path line of these tables, and the above table A pipe support rod that has a plug body that matches the center of the transport path line and that can expand and contract due to the action of fluid, and that has a fluid supply passage to the plug body inside is rotatably supported with its tip facing the water tank. And a rotation driving means for rotating the tube support rod of at least one of the tube support mechanisms of the carriage, and a fluid is supplied to the plug provided at the tip of the tube support rod of the tube support mechanism. By acting The sealed pipe is sealed at the end of the pipe to be inspected, and the pipe is supported, and the pipe is rotated by the rotation driving means of the pipe support mechanism. The pipe is moved in the axial direction by traveling of the carriage.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
That is, FIGS. 1 (a) to 1 (c) are plan views showing the mechanism and operation of the entire apparatus, and in the figure, 1 is a water tank in which ultrasonic sensors are housed, and is shown on both sides of the tank. Although not provided, there is provided a hole through which the pipe to be inspected (hereinafter referred to as “pipe”) A can pass in the axial direction along the center (a) of the transport spa line.

2, a pipe support rod 11 of a pipe support mechanism 9 to be described later has the water tank 1
2a is a draining nozzle that blows off the water attached to the plug body 14 at the tip when it passes through the water tank 2a.

The water tank 1 has an entrance table 3 and an exit table 4
The loading rack 5 for loading the pipe A toward the center (a) of the transport path line is placed on the loading table 3, and the testing-completed pipe A is loaded to the loading table 4. The carry-out side rack 6 is provided.

Reference numeral 7 is a rail that guides both the trolleys 8 and 8a on the exit side and the entrance side. Each of the trolleys 8 and 8a is equipped with a moving servomotor (not shown) to provide a so-called self-propelled function. ing. That is, the carriages 8 and 8a have a function of supporting the pipe A by the plug body 14 described later and transferring it in the axial direction.

Reference numeral 9 denotes a pipe support mechanism mounted on the carriages 8 and 8a via a support member 10. The pipe support mechanism includes automatic water seals at both ends of the pipe A, support for the pipe itself, and a function for imparting a rotational action to the pipe A. Is incorporated. That is, 11 is a tube support rod, the base portion of which is rotatably supported by a bearing member 12, a fluid supply passage 13 for air or the like is formed in the inner shaft center, and a rubber plug 14 is inserted at the tip end portion. It is fitted and fixed. The fluid supply passage 13 communicates with a fluid supply pipe 17 via a fixing member 15 and a connecting member 16, and the tip of the fluid supply passage 13 is open to the inside of the plug 14 via a plurality of branch holes 18. Therefore, as shown in FIG. 3, the plug body 14 bulges all around by supplying a fluid, and the bulging outer surface is brought into close contact with the inner surface of the end portion of the pipe A to seal the inner surface of the end portion. The pipe A is supported.

FIG. 2 shows a mechanism provided with a rotation drive means 19 for rotating the pipe A through the pipe support rod 11.
This transmits the rotation of the servomotor 20 via a gear mechanism 21 to a gear 22 provided on the outer circumference of the pipe support rod 11.

By the way, in the present invention, although not shown, in order to detect the circumference of the pipe A, the position in the axial direction, and the constant rotation feed with high accuracy, the carriage 8 and 8a are longitudinally fed. The position detection encoder and the rotation angle detection encoder on the pipe support mechanism 9 side are provided with means for synchronizing.

The present invention has a structure as described above with reference to the embodiment. First, in FIG.
, And the tip of the pipe support rod 11 is inserted into the pipe A waiting through the water tank 1 and waiting on the entry side table 3, and at the same time, the other carriage 8a is moved and the pipe support rod 11 is moved. Insert the tip of tube into tube A. At this time, the pipe support rod 1 of the carrier truck 8
Water adhering to the plug 14 at the tip of 1 is blown off by the draining nozzle 2. Here, a fluid acts on the inside of both plugs 14 to swell and support the pipe A simultaneously with water sealing.

Next, the two carriages 8 and 8a are moved to the left in synchronism with each other, and at the same time, the rotation driving means 19 is actuated so that the rotation of the pipe support rod 11 and
The pipe A is transmitted through the plug body 14, and the pipe A is passed through the water tank 1 while performing the spiral conveyance of the pipe A, and a required inspection is performed. Is stopped, the action of the fluid on the plug 14 is released, the carriages 8 and 8a are returned to their original positions to prepare for the next inspection, and the pipe A for which the inspection is completed is carried out.

At this time, the water adhering to the outer surface of the pipe A is drained from the water draining nozzle 2a.
It is blown away by the pipe supporting rod 11 when the carriage 8a is returned.
Water adhering to the plug body 14 at the tip of is drained off by the draining nozzle 2.

(Effects of the Invention) As described above, the present invention has both the left and right carriages that move in parallel with the center of the conveying path line of the table, and has the plugs that can be expanded and contracted by the action of the fluid at the tips and has the above-mentioned plugs inside. A pipe support rod having a fluid supply passage to the body is equipped with a pipe support mechanism rotatably supported with its tip facing the water tank,
In addition, at least one of them is provided with a rotation driving means for rotating the pipe supporting rod of the pipe supporting mechanism, and the water sealing at the pipe end and the full automation of the supporting and conveying can be achieved, and the skew roller found in the conventional device. Accurate inspection is possible without any inconvenience such as phase shift due to uneven rotation of
For example, it is effective and appropriate for an inspection that requires matching the positions in the circumferential direction when the inspection is performed at positions apart from each other on the tube axis. The feed pitch can be arbitrarily determined by controlling the rotation and the feed of the pipe, respectively.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and are shown in FIGS. 1 (a) to (c).
FIG. 2 is a plan view showing the overall structure of the apparatus and its operation, FIG. 2 is a vertical sectional front view showing the relational structure between the tube support mechanism and the rotation driving means, and FIG. 3 is an enlarged action view of the plug. 1 is a water tank, 3 is an entrance table, 4 is an exit table, 8,
8a is a carriage, 9 is a pipe support mechanism, 11 is a pipe support rod, 13 is a fluid supply passage, 14 is a plug, and 19 is a rotation drive means.

Claims (1)

[Scope of utility model registration request] 1. A water tank in which an ultrasonic sensor is housed and a hole for allowing passage of the pipe to be inspected in the axial direction is provided, and the pipe to be inspected is supported horizontally at the inlet and outlet sides of the water bath. Tables that can rotate and move in the axial direction, entrance side trolleys and exit side trolleys that move along guide rails that are provided in equilibrium with the center of the transport path lines of these tables, and the axes that are mounted on these trolleys. The core coincides with the center of the conveying path line of the table and has a plug body that can be expanded and contracted by the action of fluid at the tip, and a pipe support rod that has a fluid supply passage to the plug inside points the tip toward the water tank. A water immersion ultrasonic flaw detector for a pipe, comprising a pipe support mechanism rotatably supported by a rotary drive means for rotating a pipe support rod of at least one pipe support mechanism of the carriage.