JPH04175603A - Measurement of pitch of finned cable - Google Patents

Abstract

PURPOSE:To make accurate, continuous measurement of the pitch of a fin by detecting one pitch zone of the fin from the deviations of the outer diameters of the portions with and without the fin from reference values. CONSTITUTION:The measuring head 13 of an outer diameter measuring instrument 12 measures the outer diameter of a finned cable 4 continuously and outputs corresponding signals. A measuring circuit 14 takes the deviation between an outer diameter signal of the finned cable 4 inputted from the measuring head 13 and a predetermined reference outer diameter value of the cable and outputs corresponding signals, for instance '1' for the portion with the fin (upper limit) 3, 3' and '0' for the portion without the fin (lower limit) 3, 3'. A pulse encoder 17 continuously detects the revolution of a takeup machine and outputs pulse signals. A counter 18 displays each pitch of the fin 3, 3' of the finned cable 4 on the basis of signals outputted from the measuring circuit 14 and the pulse encoder 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pitch measuring method for a finned cable that automatically and continuously measures the pitch of the fins of a finned cable.

(Prior art and problems to be solved) For example, as a cable with a structure that has anti-snow accretion characteristics and is difficult to cause carropping, a coating layer 2 is provided on the outer periphery of a wire 1 as shown in FIG. One or more, for example, two protrusions are provided spirally on the surface of the coating layer 2 to form the fin 3.
．． A cable 4 with fins formed at 3° has been proposed. In such a finned cable 4, it is preferable that the pitch p of the fins of 3.3° is constant over the entire length of the cable.

By the way, for example, in the manufacturing process of finned cables by plastic extrusion molding, etc., the ratio of the pitch p of the fins 3.3' to the outer diameter d of the cable 4 (p/d)
As the distance increases, even a slight twist of the cable 4 causes a large error in the pitch, making it impossible to measure the pitch visually. In particular, for cables with long pitch fins where the ratio of the fin pitch to the outer diameter of the cable is several tens of times, for example, 50 times or more, visual determination of 7flll is too large, and the error in the pitch is too large. It is simply impossible to measure. Another problem is that it is not possible to record quality.

The present invention has been made in view of the above points, and an object of the present invention is to provide a pitch measuring method for a finned cable that can continuously and accurately measure the pitch of the fins of a finned cable. .

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, the outer diameter of a finned cable extruded from an extruder is continuously measured, and the outer diameter of the finned portion and the finned The outer diameter of the part without
The one-pitch section of the fin is determined by determining the finned portion and the non-finned portion based on the deviation from the reference value, and the length of the cable that moves during the one-pitch section is measured. It is designed to measure the pitch of the fin.

(Function) The outer diameter of the finned part and the outer diameter of the finless part of the finned cable extruded from the extruder are detected, and the parts with fins and the parts without fins are determined based on the deviation from the reference value. The l-pitch section of the fin is detected. At the same time the l
Measure the length of the cable traveled during the interval of pitch. The length of the cable at this time is 1 pin of the fin.
It will be the length of Sochi. This allows the pitch to be measured automatically.

(Example) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an example of a manufacturing device for a finned cable to which the method of the present invention is applied. They are arranged on the same straight line in the direction of cable extraction at intervals. As shown in FIG. 3, the extruder 11 coats the wire 1 with a coating layer 2, and further forms a plurality of, for example, two fins of 3.3 degrees in a spiral shape on the surface of the coating layer 2. Then, a finned cable 4 is formed and extruded.

The measuring head 13 of the outer diameter measuring device 12 continuously measures the outer diameter of the finned cable 4 and outputs a corresponding signal.

Therefore, the measuring head 13 measures the outer diameter of any part of the finned cable 4, with or without the fin 3.3'. The measurement circuit 14 extracts the deviation between the outer diameter signal of the finned cable 4 inputted from the measurement head 13 and a preset reference value of the outer diameter of the cable, and calculates the deviation of the outer diameter signal of the finned cable 4 from the fin 3.
For example, set the value of the part (upper limit) where 3゛ is “1′, fin 3
．． The value of the part without 3゛ (lower limit) is set to "0" and a corresponding signal is output. The recorder 16 continuously records the signal output from the outer diameter measuring device 11.

The take-off machine 15 rotates and holds the finned cable 4 extruded from the extruder 11, pulls out the finned cable 4 continuously at a predetermined speed, and conveys the finned cable 4 to a winding machine (not shown). For example, a pulse encoder I7 is attached to this take-up machine 15. This pulse encoder 17 continuously detects the rotation speed of the take-up machine 15 and outputs a pulse signal. The counter 18 displays each pitch of the fins 3.3'' of the finned cable 4 based on the signal output from the measurement circuit 14 and the signal output from the pulse encoder 17. Further, the ratio amplifier 19 determines the chart feeding speed of the recorder 16 based on a predetermined ratio of the pulse signal output from the pulse encoder 17.

A method for measuring the pitch of the 3.3'' fins of the cable 4 will be explained below.

The finned cable 4 extruded from the extruder 11 has two 3.3° fins spirally provided on its surface, as shown in FIG. 2(a). This finned cable 4 is extruded from the extruder II, taken up by a take-up machine 16, and wound up by a winder (not shown). The measuring head 13 of the outer diameter measuring device 12 continuously measures the outer diameter of the finned cable 4 being conveyed and outputs a corresponding signal.

The measurement circuit 14 extracts the deviation between the outer diameter signal of the finned cable 4 inputted from the measurement head 13 and the preset reference value of the outer diameter of the finned cable 4, and
．． The value of the part (upper limit) with 3゛ is set to "1", and the value of fin 3.
Assuming that the value of the part without 3° (lower limit) is "0", Figure 2 (
As shown in b), Bi, "0", "1', "0",...
, outputs the signal.

Of this output signal, the section from "bee"0" to "l" is one pitch of fin 3.3".

The counter 18 measures the line length of the finned cable 4 by counting the pulse signals input from the pulse encoder 17 during this 1 bea'0''-M1@.
This counted number is the pitch of 3.3" fins, and therefore, the counter 18 takes this counted number as the pitch of 3.3" fins and looks it up. At the same time, a total of 16 records, fins:
3. Continuously record 3' pitches. This allows, for example, to continuously and accurately adjust the fin pitch of long bitch fins and 1-piece cables that have one or more fins and the ratio of the fin pitch to the outer diameter of the cable is more than 50 times. can be measurable. .

In addition, the counter 18 indicates that the pitch of the fin 3.3' exceeds the upper and lower limits (Fig. 2 (b)) of the outer diameter of the finned cable 4 set in the outer diameter measuring device 12. When,
and the deviation from the pitch reference value set by the counter 18, "(ji - "0" - "(]', or "be"
In the event of a beep, etc., an alarm signal is output and shown in the diagram, and the alarm that is not present is activated.
The pitch of the 3.3" fins of the cable 4 can be monitored. 3.The cable can also be applied to the measurement of the pitch of the fins of overhead insulated wires, overhead power transmission lines, suspension bridge piece steel cables, etc. 7.Furthermore, the fins are not limited to those in the form of convex stripes, but can also be applied to those in other shapes, for example, fins of one fin formed annularly at predetermined intervals. .

(Effects of the Invention) As explained above, according to the present invention, pressing from an extruder,
Continuously measure the outer diameter of the finned cable taken out7.
The outer diameter of the part with fins and the part with no fins are determined based on the deviation from the reference value of the outer diameter of the part without fins, and the one-pitch section of the fin is detected. By measuring the length of the cable that moves during a section of one pitch and measuring the pitch of the fins, it is possible to continuously and accurately measure the pitch of a finned cable with a pitch of []. This has the effect of improving the quality of the finned cable, since it also allows measurement results to be recorded.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of a finned cable manufacturing apparatus to which the finned cable pitch measuring force method according to the present invention is applied, and Fig. 2 shows the outer diameter of the finned cable and the fin size. A graph showing the relationship with the pitch, and FIG. 3 is an external view showing an example of a finned cable. j...Wire rod, 2...Coating, 3.3°...Fin, 4.
... Cable with fins, 10... Cable manufacturing device with fins, 11... Extruder, 12... Outer diameter measuring device, 1
3...Measurement head, 14...Measuring circuit, 15...1 taker, 16...Recorder, 17...Pulse encoder, 18...Counter, 19...Ratio amplifier. Applicant Furukawa Electric Gyokugyo Co., Ltd. Agent Patent Attorney Kanji Nagado Figure 1 Figure 2

Claims (1)

[Claims] The outer diameter of the finned cable extruded from the extruder is continuously measured, and the portion with fins and the portion without fins are determined based on the deviation from the standard value of the outer diameter of the portion with fins and the outer diameter of the portion without fins. and detecting a one-pitch section of the fin, and measuring the length of the cable that moves during the one-pitch section to measure the pitch of the fin. Pitch measurement method.