JPS61134659A - Inspecting device - Google Patents

Abstract

PURPOSE:To execute with a high accuracy an inspection of the vicinity of a seam part of an electric welded tube by constituting the titled device so that profiling is executed by a slide shaft provided on a sensor head, with respect to a position shift which is vertical to the longitudinal direction of the electric welded tube, and also in the horizontal direction. CONSTITUTION:When an electric welded tube 1 is set after a preset has been completed, a shoe 24 contacts to the outer surface of the tube 1, but when a center K1 of the tube 1 does not coincide with a center K3 of a sensor 3, a sensor head 3 moves on a slide shaft 21 until K1 and K3 coincide with each other. When an inspection of the vicinity of a seam part S of the tube 1 is started by a sensor 2, when the seam part S is twisted, a seam sensor 9 detects the seam part S and sends a signal to a control device 20, drives a driving device 9, a frame 10 moves in the direction of an arrow D or D', the sensor head 3 comes to a prescribed position of the seam part S, and an inspection of the vicinity of the seam part S can be executed with a high accuracy.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides an inspection device for, for example, a seam portion of an electric resistance welded pipe, and more specifically, an inspection device that automatically follows the seam portion and inspects the vicinity of the seam portion. This relates to inspection equipment.

[Conventional technology]

FIG. 3 is a diagram showing a conventional inspection device for inspecting the vicinity of the seam of an ERW pipe. In the figure, (1) indicates an ERW pipe;
(2) is different from an electric resistance welded tube in that relative scanning is performed in the direction of arrow Aδ or A', and it is installed facing the outer surface of the electric resistance welded tube (1), and the seam part of the electric resistance welded tube (11) A sensor for performing all inspections in the vicinity; (3) a sensor head incorporating the above sensor and having a gimbal mechanism;

(4) is a parallel link mechanism that moves the sensor head (3), (5) is a lifting mechanism that lifts and lowers the parallel link mechanism (4), and (6) is a lifting mechanism that lifts and lowers the parallel link mechanism (4). A first frame carrying a mechanism (5), (7) a first ball screw shaft that guides and slides the first seven frames (6) t in the directions of arrows C and C'; The ninth first handle (9) rotates the first ball screw shaft (7) and moves the first frame (6) up and down in the direction of arrow C6 or C';
), a first brake mechanism for suppressing rotation of (I
1 is a second frame on which the first ball screw shaft is mounted.

+lυ are two or more pairs of cam followers attached to the second frame α, and αa is a plane perpendicular to the arrow.

and the cam follower aυ rolls), the second frame (
1 (l) A sector consisting of a part of a donut-shaped disk that is moved in the direction of the arrow and D' shown in FIG.

αj is a drive device for driving the second frame αI′, (I4 is the third frame carrying the sector α3, (Lsh is the third frame I shown by the arrows E and E
'The second ball screw shaft is guided and slid in the direction αeh, the second ball screw shaft (LSf rotates, and the third
frame (14) is a second handle for raising and lowering in the direction of arrow E6 or E'; the fin is a second brake mechanism for restraining the rotation of the second ball screw shaft a$; The fourth 7 frame on which the ball screw shaft housing 3 is mounted is attached to the frame (not shown).α! is attached to the sensor head (3), and the seam part of the electric resistance welded pipe (1) The seam sensor (2) for detecting Si is a control device that issues an operation command to the drive device αJ based on the signal detected by the seam portion/sew.

Since the conventional inspection device is configured as described above, as shown in FIG. 4 when FIG. 3 is viewed from the direction of the arrow v1, the center C1 of the arc device of the electric resistance welded tube (1) is preliminarily determined.

Sector α20 center of arc F'C2ft, second C:/
By rotating the torque αQ, the third frame (I4
' in the direction of arrow E or E' so that they match, and the retracted position of the sensor head and the electric power By rotating the first handle (8) t, the first frame (6) is moved in the direction of arrow C or C' so that the distance H to the outer surface B of the sewing tube (1) is constant. When the ERW tube (1) is set below the sensor head (3), the elevator 111 (5) is lowered and the ERW tube (1) moves toward the sensor (2) by arrow A. Alternatively, when a relative scan is performed in the A' direction and the seam part S of the electric resistance welded tube (1) moves, the seam part/height is moved to the position ek of the seam part S.
The detection signal is sent to the control device (to) 9, and the control device (a) drives the drive device (9), so that the second frame Q3 moves in the direction of the arrow or D'.

The sensor head (3) comes to a predetermined position of the seam S and inspects the vicinity of the seam S.

In the conventional inspection device, as shown in Fig. 4,
1 is shifted by a distance J in the direction of arrow G, then seam sensor a! until seam part S is found.

The second frame Ht is rotated by an angle θ in the direction of the arrow, resulting in a state as shown in FIG. At this time, the sensor head (3) with the gimbal mechanism is tilted by an angle tea and is in a friendly state, but the sensor head (2) mounted on the gimbal mechanism
is inclined so as to follow the outer surface B of the ERW tube (1). To simplify the explanation, it is assumed that cent t(2) is located directly above the seam S when the center line 2 of sector 1 passes through the center C1 of the electric resistance welded tube (1).

In the state shown in FIG. 4, the sensor (2) and the seam portion S are deviated by one position by the distance. Note that the radius of the arc F of sector Q3 is QR, the radius of the ERW pipe (1) is r, and the radius of the ERW pipe (1) is
If the distance from the outer surface of the sensor head (3) to the center M of the gimbal mechanism of the sensor head (3) is a, the above distance is expressed by the following formula, and the sensor is located at a distance L from the predetermined position to be inspected. The inspection is being carried out at a position shifted by the same amount.

[Problems to be Solved by the Invention] In the conventional inspection device as described above, when the electric resistance welded tube (11) moves in parallel in the direction of arrow G 9 or in the direction of arrow G', the seam sensor a1 is.

It is not possible to distinguish whether the seam part S has moved due to twisting. The second frame α2 is rotated, resulting in a distance as an error in the inspection position as described above.

This invention was made to solve this problem, and the positional deviation of the electric resistance welded tube (1) in the direction of the arrow G6 or G' is imitated by a slide shaft provided on the sensor head (3). Particularly, the purpose is to improve the accuracy of the inspection position of the T-7 sewing tube (11) by the sensor (2) as described above.

[Means to solve all problems]

In the inspection device according to the present invention, when the sensor head is not in contact with the slide shaft and the sensor head is not in contact with the electric resistance welded pipe,
The sensor has a complete mechanism that allows it to return to the center position.

[Effect]

In this invention, positional deviation in the horizontal direction at right angles to the longitudinal axis direction of the electric resistance welded tube is corrected by using a slide shaft provided in the sensor head. Inspection of the vicinity of the ERW tube seam can be performed with high accuracy.
1 [Embodiment] Fig. 1 shows an embodiment of the present invention, in which (1) to all are completely the same as the conventional device described above except for some functions of the sensor head (31) and the lifting mechanism (4). .Sh υ is a slide shaft that can move the sensor head (31 in a direction perpendicular to the plane of the paper), W is a bracket that fixes the slide shaft, and is mounted on the lifting mechanism (4).

C10 is a nine-spring mechanism that is installed so that the sensor head (3) returns to the center when it is not in contact with the outer surface B of the ERW tube (1); It is a shoe having a circular arc that roughly matches the curvature of the outer diameter of the electric resistance welded tube (1).

In the inspection device configured as described above, as shown in FIG. 2 when viewed from the full arrow v2 in FIG.
The horizontal level L1 that the center C1 of the circular device in 1) passes through, and the horizontal level L2 that the center C2 of the arc of sector 0 passes through.
Rather than matching, the second handle α (by rotating once) moves the third frame α4 in the direction of arrow )4 or E' to match.

Further, from the outer surface B of the ERW pipe (1), the seam sensor αl
the first handle (8) so that the distance H to
By fully rotating, the first frame (6) full arrow C
Alternatively, move it in the G' direction. From the above 1v-1
! When the test is completed and the ERW tube (11) is set below the inspection device, the drive mechanism (5) is activated.

The elevating mechanism (4) descends, and the shoe @ comes into contact with the outer surface of the ERW tube (1). At this time, the center Ks of the shoe (3)
When 2 does not align with the center of the ERW tube (fl), the shoe (3) acts on the horizontal component F1 of the force F received from the ERW tube (11), and the sensor head (3) moves toward the slide axis +
21) Move the clasp until the electric resistance welded tube (1 to the center of 11 and the center of the shoe Ks i)E Ik. In this way, the inspection near the seam part S of the ERW pipe (11) begins.
At this time, if the seam part S is twisted, the seam sensor α
The field detects the entire seam part S, sends this detection signal to the control device (A), and the control device (A) drives the drive device (9) so that the second frame α1 moves along the arrow direction or D' the sensor head (31) comes to a predetermined position on the seam S.

A predetermined position near the seam S can be inspected.

Note that the relative movement between the ERW tube (11) and this inspection device in the direction shown by arrow A or A' is 69°.First, the position of the ERW tube (11 is in the direction of arrow G or G' When the electric resistance welding tube (1) moves in the direction of the arrow M or M', the sensor head (3) slides on the slide shaft QD, and the elevating mechanism (5) When the seam part S of the electric resistance welded tube (11) moves in the direction of arrow N or N', the parallel link mechanism (4) causes the seam sensor (IS) to detect the seam part S, and this detection signal The control device (2) is the drive device!
II and move the second frame to arrow or D.
By moving the sensor head (3) in the direction of When the sensor head (3) is not in contact with the material, the spring mechanism (c) causes the sensor head (3) to approximately align with the center of the sewing tube (1).

〔Effect of the invention〕

As described above, this invention inspects a predetermined position near the seam of an ERW pipe by making a sensor accurately follow a predetermined position near the seam of the ERW pipe in response to various positional deviations of the ERW pipe. It has the effect of being able to

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of the embodiment of the invention. FIG. 3 is a diagram showing a conventional inspection apparatus, and FIG. 4 is a diagram for explaining the entire operation of the conventional inspection apparatus. In the figure, (1) is an ERW tube, (2) is a se:yt, (
31t! Sensor head, (4) parallel link mechanism, (5
) is a lifting mechanism. (6) is the first frame, and (7) is the first ball screw shaft. +81fli! 1 is the handle, and (9) is the first brake mechanism. tll is the second frame, aυ is the cam follower, a3 is the sector, α3 is the drive device, Q4) is the third frame,
The second ball screw shaft, a* is the second handle, (I
η is the second brake mechanism, α fathom is the fourth frame, (
19 is a seam sensor, (4) is a control device, ? 2υ is the slide axis. (2) is the bracket shaft, (to) is the spring mechanism, and @ is the shoe. In addition, the same reference numerals are used for the same or corresponding parts in the figures.
1 is attached.

Claims (1)

[Claims] a sensor installed opposite to the vicinity of a seam of an ERW pipe to inspect a predetermined position in the vicinity of the seam; a sensor head incorporating the sensor and having a gimbal mechanism;
A shoe that forms part of the sensor head and has an arc that roughly matches the outer diameter curvature of the ERW tube for abutting against the surface of the ERW tube; and a slide shaft that moves in the horizontal direction, a bracket that fixes the slide shaft, and when the shoe is attached to the bracket and the shoe is not in contact with the electric resistance welding tube, the center of the shoe is moved to the center position on the slide shaft. a spring mechanism for returning, a parallel link mechanism on which the bracket is mounted, an elevating mechanism for elevating the parallel link mechanism, and a first frame on which the elevating mechanism is mounted;
a first ball screw shaft that moves the first frame while guiding it in a first direction perpendicular to the longitudinal axis direction of the electric resistance welding tube; and a first ball screw shaft that rotates the first ball screw shaft to move the first frame to the a handle for moving in a first direction;
a second frame on which a ball screw shaft is mounted;
two or more pairs of cam followers attached to the frame of the
a sector consisting of a part of a donut-shaped disk parallel to the vertical device of the electric resistance welded tube on which the cam follower rolls, and a drive device that moves the second frame over three sectors of arcuate surfaces by the cam follower; a third frame carrying a sector; and a second ball screw shaft that is installed parallel to the first ball screw shaft and moves the third frame while guiding it in a direction parallel to the first frame. a handle for rotating the second ball screw shaft and moving the third frame in a direction parallel to the first direction; a fourth frame on which the second ball screw shaft is mounted; An inspection device comprising: a seam detector attached to a frame; and a control device that sends a command signal to the drive device based on information from the seam detector.