JPH03289501A - Apparatus for measuring pitch of filament body made of metal - Google Patents

Abstract

PURPOSE:To make it possible to measure a pitch without removing the coating even for a filament body having the coating by continuously detecting the irregularities of the moving filament body made of metal with an vortex type irregularity detecting means, and obtaining the value of the pitch and the position of a protruding part or a recess part. CONSTITUTION:A corrugated pipe 1 comprising a filament body 1a made of metal and a coating 1b is conveyed in the direction of an arrow A at a speed Vo. The moved distance of the pipe 1 is detected with an encoder 5 which is connected to a roller 3 in contact with the pipe 1. A pulse signal SL is inputted into a pitch operating part 6 and a counting part 7. Meanwhile, the irregularities of the filament 1a are detected with a sensor 8 and a vortex type protruding-part detecting means 11. A pulse-signal SN is supplied into an operating part 6. The operating part 6 computes a pitch P of the filament body 1a and outputs the pitch to a judging part 17. The judging part 17 judges whether the pitch P lies within a preset range from a setting part 19 or not and outputs the result into an output part 19. The distance from the start of the counting with a counter 7 (the position of the pitch) is printed with a printer 21. When the pitch is not in the allowance range, a warning device 20 is operated.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a metal filament pitch measuring device suitable for measuring the corrugated pitch of flexible pipes, the pitch of wire lobes or conductors for electric wires, and further relates to Specifically, the pitch of a metal filament provided with a coating is continuously measured, and the quality of the pitch is determined.

"Prior Art" Conventionally, the following methods have been known as methods for measuring the pitch of the various metal filament bodies described above. In addition,
The pitch of the metal filament is measured while it is being transported by boat during the manufacturing process.

■Sampling the striatum and measuring it using a scale or gauge.

■ Project a laser beam onto the surface of the striatum, detect the period of change in the reflected light or diffusely reflected light, count the number of convexes or concave parts, and calculate the pitch for each predetermined moving distance (optical Measuring method).

■Using sound waves such as ultrasonic waves instead of the laser light described above (acoustic measurement method).

"Problems to be Solved by the Invention" By the way, the various conventional measurement methods described above have the following problems.

The problem in item (2) is that the line is stopped for sampling, which reduces production efficiency.

Regarding the problems in items (2) and (2), measurement cannot be performed if the filamentous body is covered and no irregularities appear on its surface.

This invention was made in view of the above-mentioned circumstances, and the metal filament pitch is provided with a coating, has no unevenness on its surface, and can measure the pitch even when it is in a moving state. The purpose is to provide a measuring device.

"Means for Solving the Problems" The present invention includes a moving distance measuring means for measuring a moving distance of a metal filament, and an eddy current unevenness detecting means for detecting unevenness of the metal filament. In the metal filament pitch measuring device, the pitch value and the position of the convex portion or concave portion of the metal filament are continuously determined based on the measurement result by the moving distance measuring means and the detection result by the eddy current unevenness detection means. and a calculation means to calculate the pitch, and determine whether the pitch calculated by this calculation means is within a predetermined tolerance range, and output defect information if it is not within the tolerance range. The method is characterized by comprising a determination means.

"Operation" According to the above configuration, the unevenness of the metal filament is detected by the eddy current type unevenness detection means, and based on the detection result and the moving distance of the filament, the pitch value and the convex or concave portion are determined. location is required. Then, in the order obtained, it is determined whether the pitch is within a predetermined allowable range or not, and if it is not within a predetermined tolerance range, defect information is output.

Therefore, the pitch can be measured even when the coating is provided, no irregularities appear on its surface, and even when it is in a moving state.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a metal filament pitch measuring device which is an embodiment of the present invention. In this figure, reference numeral 1 denotes a corrugated pipe as an object to be measured, and as shown in the figure, it is composed of a corrugated metal linear body 1a and a covering lb that covers this linear body 1a. In addition, the corrugator shown in this figure. The tube I is just before it becomes a product, and it is moved at a speed v in the direction of arrow A by a conveying device (not shown).
0 is being transported. 2.3 are rollers, of which roller 2 is in contact with the upper part of the corrugated pipe l,
A roller 3 is in contact with the lower part of the interpipe l.

Also, the roller 2 is moved by the spring 4 to the corrugated pipe I.
are in contact with each other in a biased state. An encoder 5 is connected to the roller 3, and the rotational speed of the roller 3, that is, the moving distance of the corrugated pipe 1 is detected. The pulse signal S 2 output from the encoder 5 is supplied to a pitch calculation section 6 and a counting section 7. The pitch calculation unit 6 performs calculations to determine the pitch P of the corrugated tube 1, and the counting unit 7 counts pulse signals S.sub.2. Note that the details of the function of the pitch calculation section 6 will be described later. 8 is a sensor, which is arranged close to the corrugated pipe 1 as shown in the figure. This sensor 8
As shown in FIG.
a and 10b.

Returning to FIG. 1, reference numeral 11 denotes an eddy current type convex detector, which, as is well known, is used for flaw detection of metal wires and metal tubes.

This eddy current type protrusion detector 11 utilizes the phenomenon that the magnetic flux generated by passing an alternating current through a coil changes depending on the flaws or shape of the object to be measured, and the sensor 8 described above is used as the coil. . Here, the eddy current convex detector 11 is
- As shown in FIG. 3, the fishing boat is constructed with an oscillation circuit 12, a bridge circuit 13, an amplifier circuit 14, a signal processing circuit 15, and a selection circuit I6. The bridge circuit 13 has a bridge whose side is the coil 10alOb of the sensor 8, and outputs a signal when the bridge balance collapses due to a change in the impedance of each coil IOa, IOb. After the signal output from this bridge circuit I3 is amplified by the amplifier circuit 14, the signal processing circuit I5
and the convex signal is extracted. The extracted convex signal is then supplied to the selection circuit 16, where peak detection is performed.

In this case, the selection circuit 16 uses the pulse signal S at the time of peak detection.
Output force. This pulse signal S force is then supplied to the pitch calculation section 6.

Returning to FIG. 1 again, the pitch calculation unit 6 is supplied with the pulse signal S from the encoder 5, and receives the pulse signal S? from the eddy current convexity detector 11. When j is supplied, the pitch P of the striatum 1a is calculated based on these. In this case, pitch P,
is obtained by dividing the count value C of the pulse signal S obtained when the count value C of the pulse signal S force reaches the predetermined value C- from the start of measurement by the predetermined value C-. After determining and outputting the pitch P, the pitch calculating section 6 starts counting the pulse signal Si and the pulse signal S again, and calculates and outputs the pitch P. The same operation is repeated thereafter. FIG. 4 shows the relationship between the pulse signal S output from the encoder 5 and the pulse signal S output from the eddy current convex detector 8. Pitches P , , P ! calculated by the pitch calculating section 6! +... are sequentially supplied to the determination unit 17.

The determining unit 17 determines the supplied pitches P , , P , .
Each time the pitch P is supplied, it is determined whether or not the pitch P is within a tolerance range PS (non-defective range) set in advance by the setting section 18, and the determination result is supplied to the output section 19. In this case, if it is determined that the pitch PrJ is within the allowable range PS, the data of rlJ is
9, and if it is determined that it is not within the allowable range PS, data of “0” is supplied to the output unit 19.

When the output unit I9 is supplied with the data “0” from the determination unit 17, it operates the alarm 20 and determines the position of the defective pitch Pt, that is, the measurement based on the integrated value of the pulse signal S supplied from the measurement unit 7. The printer 21 prints the distance from the starting position. Note that the output section 19 is provided with an external terminal (not shown), which allows the defective pitch P7 to be
In addition to printing 7, it is also possible to mark the defective portion of the corrugated pipe l using a marker or the like.

In this way, the sensor 8 and the eddy current convexity detector 11 continuously detect the convexity of the striated body 1a of the corrugated pipe 1 as the limb canal 1 moves, and the pitch P is determined.

Px, P3... are calculated sequentially. and,
Tolerance range P in which pitch P is preset in the order of calculation
It is determined whether or not it is within S, and if it is not within this range, the alarm 20 is activated and the position of the defective part from the measurement start position is printed on the printer 2I.

In the above embodiment, the pitch P is determined when the count value C of the pulse signal S reaches the set value C-. Alternatively, the pitch P' may be calculated from the counted value of Ch during that time.

In addition, the above-mentioned embodiments can of course continuously measure the thread pitch, winding pitch, and collective pitch of thread-like objects, conductors for electric wires and cables, aggregates thereof, wire lobes, etc., regardless of whether they are coated or not.

Furthermore, in the above embodiment, the eddy current convex detector 11 is
Although only the convex portions of the filamentous body 1a are detected, a function that can also detect concave portions may be added. This makes it possible to detect pitch changes even in recesses.

Further, in the above embodiment, the pitch calculating section 6, the counting section 7, the determining section I7, the setting section 18, and the output section 19 are provided separately, but the functions of these sections are controlled by a microcomputer (CPU; central processing unit). , ROM, read-only memory, RAM, random access memory, and interface).

Furthermore, in the above embodiment, the measurement is carried out while moving the corrugated pipe l. However, for an object to be measured that is in a stopped state or that repeatedly stops and moves, the sensor 8 and the encoder 5 (with the roller 3 attached to it) Pitch can be measured by installing a device (in this state) and moving it over the object to be measured.

"Effect of the Invention J As explained above, according to the metal filament pitch measuring device according to the present invention, the eddy current type unevenness detecting means detects the irregularities of the metal filament as the filament moves. Continuously detect and determine the pitch value based on the distance traveled, as well as the position of the convex or concave portion.Then, in the order of determination, it is determined whether the pitch is within a predetermined tolerance range. If the pitch is not within the range, defect information is output, so even if the metal wire body is coated, the pitch can be measured without removing the coat.

Furthermore, since the pitch can be measured while being transported, there is no need to stop the line.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a metal filament pitch measuring device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the sensor 8, and FIG. 3 is a block diagram showing the configuration of the eddy current protrusion detector 11. 4 are waveform diagrams for explaining this embodiment. 1... Corrugated pipe, 5... Encoder (moving distance detection means), 6...
-... Pitch calculation section, 7... Counting section, 8... Sensor, 11.
... Eddy current convexity detector (8, 11 are eddy current unevenness detection means), 17 ... Judgment section (judgment means), 19 ...
- Output section (6, 7, 19 are calculation means).

Claims (1)

[Scope of Claims] A metal filament pitch measurement device comprising: a movement distance measuring means for measuring the movement distance of the metal filament; and an eddy current unevenness detection means for detecting irregularities of the metal filament. In the apparatus, a calculation means for continuously determining the pitch value and the position of the convex part or the concave part of the metal filament based on the measurement result by the movement distance measuring means and the detection result by the eddy current unevenness detection means; and determining means for determining whether or not the pitch calculated by the calculation means is within a predetermined tolerance range, and outputting defect information if the pitch is not within the tolerance range. A metal filament pitch measuring device characterized by: