JPS638511A - Device for measuring film thickness of coated steel pipe - Google Patents

Abstract

PURPOSE:To measure film thicknesses of coated steel pipes of various outside- diameters with a single measuring mechanism by vertical motions of a substrate, by suspending the substrate free to move up and down and to swing and installing a centripedal mechanism in front of the substrate and a measuring mechanism on the rear surface. CONSTITUTION:A substrate 21 is suspended free to move up and down and to swing on a frame-shaped bench 1 installed free to displace along a perpendicular line crossing a pipe axis of a coated steel pipe CP by an elevating mechanism 11. And, a centripedal mechanism 31 is installed in front of a substrate 21 and a measuring mechanism 41 free to swing on the rear surface and a film-thickness measuring probe 50 is set free to move forward and backward in the pipe diameter direction of the CP. And, corresponding to various outside- diameters of the CP, the measuring mechanism 41 is allowed to make vertical motions to the specified positions by the elevating mechanism 11. Consequently, film thicknesses of various outside-diameters of the CPs can be measured by a single measuring mechanism 41.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a coating thickness measuring device for coated steel pipes.

Conventional steel pipes are coated with plastic resin for the purpose of corrosion prevention, but the coating thickness is required to be as uniform as possible.

For this reason, conventionally the coating thickness was measured using a micrometer or electromagnetic thickness gauge at the end of the coating line, but this method directly controls the coating equipment to ensure uniform coating thickness. It is not possible to aim for

Therefore, the present applicant first proposed a method and device for controlling the film thickness of a coated steel casing (Japanese Unexamined Patent Publication No. 59-57109).

As shown in the side view in FIG. 6 and the front view in FIG.
A plurality of probes (65) and pipe guide rolls (66) are attached to the rotating ring (64) at predetermined intervals so as to be movable in the radial direction of the coated steel pipe (CP).
The coated steel pipe (CP) is conveyed concentrically with the rotary ring (64) by adjusting the forward and backward movement of the pipe guide roll (66). During this time, the coated steel pipe (CP) is conveyed concentrically with the rotary ring (64) by the motor (67) via the timing belt (68) and the drive gear (69). 64) is rotated by a predetermined angle to measure the film thickness in sections with a probe (65), and based on the results, the amount of plastic resin discharged by the coating device is adjusted in the circumferential direction in order to make the film thickness uniform. I'll go.

Problems to be Solved by the Invention (1) Generally, a cross-to-rad die type coating device is used for the above-mentioned plastic resin coating of steel pipes.
Steel pipes of various outside diameters from 15A to 650A are coated.

For this reason, in the above-mentioned film thickness measuring device, coated steel pipe (CP)
The probe (65) is attached to the support frame (63) according to the outer diameter of the
Attaching the measuring mechanism, which consists of a rotary ring (64), must be prepared for at least large, medium, and small diameters, and it takes time and effort to change the setup.
Since the rollers of the line conveyor that transports coated steel pipes (CP) are of the lower level type, a height adjustment function must be modified, resulting in problems such as low work efficiency and high equipment costs. Roughly, pipe guide roll (
66), the spacing must be adjusted to be slightly wider than the pipe diameter to avoid damage due to the valve face of the coated steel pipe (CP) or the level difference at the connection part, and the measurement beam part and the coated steel pipe (CP) may not be concentric and may not be measured. There was a problem that the value was inaccurate.

(2) The vertical and horizontal tracking of the coated steel pipe (cp) is done by the spring (62).If the vertical and horizontal fluctuations of the coated steel pipe (cp) are large, the pipe guide roll (66) follows the spring (62). There are parts that are pressed harder, which inevitably causes problems such as damage to the surface of the coated steel pipe (CP).

The present invention has been made in view of the above-mentioned problems, and is a coated steel pipe that can quickly and accurately measure the film thickness of coated steel pipes of various outside diameters in a single measurement without modifying the equipment. This paper proposes a film thickness measuring device.

Means for Solving the Problems As shown in FIGS. 1 to 5 of the embodiment, the present invention provides a frame-shaped pedestal (1) movably provided perpendicular to the pipe axis of a coated steel pipe (CP). and a passage hole (with a diameter larger than that of the coated steel pipe (CP)).
22), and a lifting mechanism (
11) via links (23a) (23b), the substrate (21) is vertically movable and swingably supported;
1) A lever (34) having contact rollers (35) is pivotally supported at multiple locations on a concentric circle around the front pipe hole (22) and rotated in the pipe radial direction by a link (33) (33) A freely movable centripetal mechanism (31) and a passage hole (
An annular disc (
42) A link (48a) (48b) with a pin (48d) protruding from the side surface near the shaft support, which is rotatable in the radial direction of the tube, with one end pivotally supported at multiple locations on concentric circles on the rear surface and protruding in the tube axis direction.
) at the other end of which a film thickness measurement probe (50) is suspended, and links (48a) (48b) are attached to the annular disk (42).
) supporting the bin (48d) with a stopper piece (52b) of a worm gear (52a) that is pivotally supported in parallel with the shaft support;
The worm gear (52a) meshes with the worm (52c) which is supported and protruded from the annular disc (42), and
A chain (54) stretched by Δ2 on an annular disc (42) is suspended on a 52-digit gear (52d) coaxially with the arm (52C),
The link (48a) (48b) and the suspended bottom film thickness measuring probe (50) are interlocked with each other, and a measurement) HM (41) is movable in the radial direction of the pipe.

Function: Since the film thickness measuring device of the present invention has a groove as described above, the measuring mechanism (41) can be moved to a predetermined position by the elevating mechanism (11) in accordance with the various outer diameters of the coated steel pipe (CP). Can be moved up and down into position. Furthermore, the centripetal mechanism (31) allows the measuring device 4M (41) to be completely concentric with the object 114W (CP).

Therefore, the film thickness of coated steel pipes (CP) of various outer diameters can be measured quickly and accurately by one measurement III (41) without modifying the equipment.

Example Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a front view of the coated steel pipe film thickness measuring device according to the present invention, FIG. 2 is a rear view of the same, and FIG. 3 is the same as that shown in FIG.
FIG. 4 is an enlarged sectional view taken along line I, FIG. 4 is an enlarged sectional view between the same measuring instruments, and FIG. 5 is a sectional view taken along line v--V in FIG.

As described above, the film thickness measuring device of the present invention can be used to measure coated steel pipes (
A frame-shaped pedestal (1
) with an elevator 4M (11) to suspend the board (21) so that it can move vertically and swing freely, and a centripetal mechanism (
31), a measuring mechanism (41) is rotatably provided on the rear surface,
The film thickness measuring probe (50) of the measuring mechanism (41) is capable of moving forward and backward in the radial direction of the coated steel pipe (CP).

In other words, the frame-shaped pedestal (1) is made of wheels (6) installed on the lower beam frame (4), and is movable on the rail (R) laid perpendicular to the axis of the coated steel pipe (CP). be.

The lifting mechanism (11) has a slider (14) attached to a screw shaft (13) that is rotated by a motor (12) provided between the upper beam frame (2) and the middle beam frame (3) of the frame-shaped pedestal (1). ) are screwed together to form the base (21).
is suspended from this mover (14) so that it can move up and down.

The base (21) has a pipe passage hole (22) in the center with a diameter larger than that of the coated steel pipe (CP), and has a movable member (1) of the lifting mechanism (11).
Links (23a and 23b) having a balance weight (24) at one end are pivoted to the center of the upper part of the frame frame (1) with a pair of 52-digit thrust supports (25) at the four corners. The column frame (5) (51) is clamped and WH is suspended from the frame-shaped pedestal (1) so that it can move up and down and swing while maintaining balance on the balance way 1- (24). The base 1 (21) is fixed to the frame-shaped pedestal (1) by a clamp cylinder (26) provided below the upper thrust receiver (25).

The centripetal unit 4M (31) is connected to the passage hole (22) on the front surface of the board (21).
) A cylinder (32) that pivotally supports a lever (34) having a tube contact roller (35) at three locations on a concentric circle around the base plate (21) and is attached to a support plate (21a) protruding from the center of the upper part of the base plate (21).
The link (33) is configured to rotate in the radial direction of the pipe via the link (33). In addition, the pipe contact roller (35)
is made of a soft material such as urethane rubber, and the cylinder (32
) is equipped with a pressure reducing valve (not shown) and covered! ! ii tube (
It is designed so as not to damage the coating of CP).

The measurement mechanism (41) has a pipe hole (22) on the rear surface of the board (21).
is supported by a plurality of rollers (27) concentrically with the motor (4).
At step 3), the annular disk (
42) on the concentric circle on the rear surface of the annular disk (42).
A support plate (46) and an arm rod (47) are provided protrudingly at the locations, one end is pivotally supported on the support plate (46) between the two, and the other ends of links (48a) and (48b) are provided protruding in the tube axis direction. Bracket (49
), a film thickness measuring probe (50), such as an ultrasonic wall thickness meter, is hung in the nozzle box, and the rod tip (51a) is connected to the link (48c) via the link (48c).
8a), link (48a) (48b
) to rotate in the pipe diameter direction, and the link (
A pin (48d) is provided protruding from the side surface near the shaft support of 48b),
The pin (48d) is supported by a stopper piece (52b) of a worm gear (52a) that is pivotally supported on the side surface of the support plate (46), and a worm (52b) that is pivotally supported on the side surface of the support plate (46) is supported on the worm gear (52a). 52c) and a gear (52d) coaxially connected to the annular disc (42).
3), the chain (54) that rotates is stretched across the pulley (55), and the chain (54) is connected to the gear (52d).
and the link (4a) together with the stopper piece (52b).
a) Rotate (48b) and remove the film thickness measurement probe (50).
It is designed to move forward and backward in the radial direction of the pipe in conjunction with each other.

In order to measure the film thickness of a millimeter tube using the above-mentioned device, first move and install the frame-shaped pedestal (1) to the conveying line for coated steel pipes (CP), and then turn on the motor (12) of the lifting structure (11).
) to move the board (21) up and down and measure the measurement mechanism (41).
to a predetermined position corresponding to the outer diameter of the coated steel pipe (CP).

Next, the tip of the coated steel pipe (CP) is exposed to the tube passage hole (22) of the substrate (21), and the cylinder (3) of the centripetal mechanism (31) is
2) and press the tube contact roller (35) into contact. Thereafter, the motor (53) of the measuring mechanism (41) is operated to rotate the spring 1 to the collar piece (52b) to the position indicated by the chain line in FIG.
48b) Attach the side pin (48d) to the stopper piece (52b)
The film thickness measurement probe (50) is moved forward in the direction of the pipe diameter while supported by the winder 5 (53) and the cylinder (51).
This time, the motor (53) is operated in the opposite direction to the above to rotate the stopper piece (52b), and the film thickness measurement probe (50) is moved back toward the outside of the pipe diameter. Adjust the distance from the coated steel pipe (CP). Usually this interval is 10
Adjusted to ~20mm.

Note that these operations are performed based on preset values corresponding to various outer diameters based on standard polished round steel. Therefore, it is possible to quickly and accurately change the setup of coated steel pipes of various outside diameters without relying on the operator's skill and experience as in the past.

The motor (43) installed on the back surface of the board (21)
) is activated and regulated by the stopper (45), and the annular disc (42
) by a predetermined angle (ioo'') and conveying the coated steel pipe (CP), the film thickness can be measured in four sections.

The cylinder (32) of the centripetal device 1 (31) and the cylinder (51) of the measuring device 1 (41) are a connection detection device (not shown) of a coated steel pipe (CP) installed on the upstream side of the conveyance line. , operated by a detection device applying the eddy current method, for example,
The tube contact roller (35) and the film thickness measuring probe (50) are also retracted when the coated steel pipe (CP) passes through the joint, and returned after passing. Therefore, there is no damage to the equipment due to vibration of the coated steel pipe, nose burrs, connections, etc.
The measuring mechanism is always placed concentrically on coated steel pipes of various outside diameters to ensure accurate measurements.

In this way, the film thickness data measured in sections is immediately transmitted to the coating device via the calculation device and the control device, and the coating device adjusts the discharge amount of plastic resin in the circumferential direction based on this data. The film thickness can be made uniform.

Although the example in which the film thickness measurement probes are installed at the 4B location for measurement has been described above, the number of installations is not limited to this.

Effects of the Invention As described above, in the present invention, a substrate is suspended from a frame-shaped mount so that it can move vertically and swing freely, and a centripetal mechanism is provided on the front surface of the substrate, and a measuring mechanism is provided on the rear surface of the substrate. Since the film thickness of coated steel pipes of various outside diameters can be measured using a single measurement mechanism, setup changes can be made quickly and work efficiency can be improved. Furthermore, the centripetal mechanism allows the measuring mechanism to be completely concentric with the coated steel pipe that moves vertically and horizontally, allowing accurate measurements to be made without damaging the surface of the coated steel pipe, thereby improving measurement accuracy. In general, there is no need to prepare various measuring mechanisms, and there is no need to modify the line conveyor, so the equipment becomes a tube and the equipment cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view of the film thickness measuring device for coated steel pipes according to the present invention, Fig. 2 is a rear view of the same, and Fig. 3 is the same as Fig. 1 III-II.
4 is an enlarged sectional view of the same measuring mechanism as above; FIG. 5 is a sectional view taken along line V-V in FIG. 4; FIG. 6 is a side view of a conventional film thickness measuring device; The figure is a front view of the same as above. DESCRIPTION OF SYMBOLS 1... Frame-shaped mount, 11... Lifting mechanism, 21... Board, 22... Pipe hole, 23a, b... Link, 31
... Centripetal mechanism, 33... Link, 34... Lever, 35... Pipe contact roller, 41... Measuring mechanism, 42
... Annular disc, 48a, b... Link, 48d...
・Pin, 50... Film thickness measurement probe, 52a... Worm gear, 52b... Sl-flange piece, 52C...
Worm, 52d...Gear, 54...Chain, C
P...Coated steel pipe. Applicant: Sumitomo Metal Industries, Ltd. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] It has a frame-shaped pedestal that is movable perpendicular to the pipe axis of the coated steel pipe, and a passage hole having a diameter larger than that of the coated steel pipe, and is connected to an elevating mechanism provided on the frame-shaped pedestal via a link so that it can be moved up and down. A centripetal mechanism in which a swingably supported board and a lever with pipe abutting rollers at multiple locations on a concentric circle around the pipe hole on the front surface of the board are pivotally supported and can be rotated in the pipe radial direction by links. and an annular disk provided on the rear surface of the substrate so as to be rotatable at a predetermined angle concentrically with the tube passage hole, with one end pivoted at multiple points on the concentric circles of the rear surface of the annular disk, protruding in the tube axis direction, and rotating in the tube radial direction. A film thickness measurement probe is suspended from one end of a link with a pin protruding from the side near the freely movable shaft support, and the pin is held by a stopper piece of a worm gear that is rotatably supported on the annular disc in parallel with the link shaft support. The worm gear is supported by a worm having a shaft support protruding from an annular disk, and the worm is engaged with the worm gear, and a chain stretched from the annular disk is stretched around a gear provided coaxially with the worm, and the film thickness is suspended from the link. A coating thickness measuring device for coated steel pipes, which consists of a measuring mechanism that can freely move forward and backward in the pipe diameter direction by interlocking a measuring probe.