JPS593207A - Method for measuring length of long material - Google Patents

Abstract

PURPOSE:To measure the length of a long material highly accurately, by obtaining the number of pulses which are generated during the time the tip of the long material passes through a reference length, thereby removing the effects of the change in outer diameter of the long material, abrasion of rollers, and the like. CONSTITUTION:A long material 3 is supported by a pulurality of conveyer rollers 1 and sent to a longitudinal direction. A measuring pulse generator 2 is attached to the conveyer rollers 1, and a plurality of fixed length detecting sensors 4-8 are arranged along the conveying line. A reference length sensor 14 is arranged at a distance separated by a reference length l0 from the sensor 4 in front of it. A fixed length l2 of the long material 3 is obtained by the sensor 6 at the timing when a tip 3a of the long material 3 passes the sensor 4. The number of pulses N1 from the pulse generator 2 until a rear end 3b of the long material 3 passes throgh the sensor 6 is counted. The number of pulses n0 during the period the tip 3a of the long material 3 passes the part between the sensors 4 and 14 is obtained. Then the total length L of the long material 3 is computed by an expression L=l2+N1l0/n0. In this way, the length of the long material 3 is measured highly accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method for measuring the length of a long material, such as a tube or rod, in which the entire length of the long material is measured while moving the long material in a pitching direction.

Conventionally, a method for measuring the total length of a long material such as a steel pipe that is conveyed in the longitudinal direction by a conveyor uses a length measurement pulse generator attached to a conveyance roller and multiple detectors that detect the fixed length of the long material. There is a method of calculating the length of the remaining part other than the fixed length part by counting the number of pulses generated by the length measurement pulse, and adding the fixed length and the remaining thread length to find the total length of the long material. be. This will be explained with reference to FIG. A plurality of conveyance rollers l are arranged on the conveyance line of the long 2-material 3,
Each conveying roller is moved by a drive motor 9 to a reducer 10.
A plurality of transmission gears 11 and a transmission shaft 1 connecting these gears
The long material 3 is thereby conveyed in the direction of the arrow. Length measurement pulse generator 2 on conveyor roller l
and a plurality of fixed length detection sensors such as photoelectric switches 4, 5, 6, 7, 8i along the conveyor line.
Arrange at regular intervals. These photoelectric switches are made of long material 3
This is for detecting the fixed lengths t1 to t4.

In the illustrated state, when the long material 3 moves in the direction of the arrow in the figure and the tip of the long material 3 passes the sensor 4 located at the forward position #ii in the traveling direction, the other sensors 5.6 is detecting the long material 3, and among the sensors currently being detected, the sensor 6 that is farthest from the sensor 4 is automatically selected by the control unit rC, and the rI! tllll-& pulse generator 2 until the rear end of the long object 3 passes the sensor 6 at the same timing as mentioned above.
The number of generated pulses N is calculated as L, and the total length of the long wire 3 is determined by equation (1).

L=tz+T)-N (1) where p is the moving length of the long material per one pulse of the length measurement pulse generator 2. Conventionally, in order to obtain this p, the circumferential length and rotation speed of the conveying roller 1 have been used as a reference. That is, the circumferential length of the part of the curved feed roller l in contact with the long material 3 is tR1, the number of pulses per one rotation of the conveyance roller of the length measuring pulse generator 2 is set as NO, and p=
tI< / No... It is determined from (2).

However, in this method of taking the circumferential length of the conveying roller as a reference, as shown by reference numeral 3.3' in FIG. , conveyance roller l
The contact points 13 and +3' between the long strips 3 and 3' are different, and as a result, the row 2 circumferential length tR of the contact portion changes. Therefore, in this conventional method, p is calculated each time the outer diameter of the long material changes, or the value of p for each outer diameter is made into a table and this value is selected and used for each long material that should be longer. There is the inconvenience of having to do this, and since the circumferential length LR changes due to wear of the conveying roller l and VC, we corrected this p to a constant value of 1υ (target yc) to prevent the measurement error of the total length from increasing at a constant value of 6111. It was necessary to prevent it.
・The present invention calculates the moving length of the long material corresponding to one pulse of the 6+11 long pulse generator directly on the conveyance line without determining it from the circumference of the conveyance roller. The purpose of the present invention is to provide a method for measuring the length of long materials that eliminates the influence of wear and improves accuracy.

The gist of the present invention is to arrange a sensor that measures a reference length in addition to a sensor that detects a fixed length of a steel pipe along a movement line of the steel pipe, and to measure the amount of data generated while the steel pipe moves through this reference length. The reference pulse number no of the long pulse generator is counted, and the moving length po of the steel pipe per one pulse number of the length measurement pulse generator is calculated from this reference length to and the reference pulse number no, and the remaining length other than the fixed length is calculated. Part is the specific point (sensor position tX>
The number of pulses N1 of the sub-length pulse generator until passing through
, and add the remaining length I) O'Nl to the fixed length.
is added to measure the total length of the steel pipe.

Hereinafter, the present invention will be described with reference to the drawings.

FIG. 3 schematically shows a long material length measuring device for carrying out the present invention. Note that the drive device, speed reducer, or transmission gear mechanism for moving the long material such as steel pipe, which is the material to be measured, is not shown in this figure, but these are the same as those explained in Figure 1. The following configuration is sufficient. The elongated material 3 is carried by a plurality of conveyance rollers 1 and conveyed in the longitudinal direction. 1st
As in the case shown in the figure, a length measurement pulse generator 2 is attached to the conveyance roller 1, and a plurality of fixed length detection sensors 4.5.6.7
．． 8 is the construction along the conveyance line. In this embodiment, a reference length detection sensor 14 is disposed at a distance of the reference length in front of the sensor in the traveling direction.

The long material 3 is detected at the timing when the tip 3a of the long material 3 passes the first fixed length detection sensor 4. When the remote sensor 6 is automatically selected by the control unit to determine the fixed length of the long material, the length measurement pulse 'a' is generated until the rear end 3b of the long material 3 passes the sensor 6.
2. Count the number of buses Nt f. Pulses of the sub-length pulse generator 2 from when the tip 3a of the cut long material 3 passes the sensor 4 until it passes the reference length detection sensor 14, that is, while the long material 3 is moving over the reference length. Count the number no. Length p per pulse of length measurement pulse generator 2
o is t.

po=-・・・・・・(3) n.

Based on this, the length of the remaining part of the long material 3 other than the fixed length 72 portion becomes po-N1, so the total length of the long material 3 is L = 12 + po'Nt -- (4) Desired.

In this way, in the present invention, the number of pulses generated during the time when the tip of the long material 3 passes through the % standard length is determined by rC, and the movement per pulse of the length measuring pulse generator 2 attached to the conveying roller is calculated. The length Po can be determined directly and automatically. Therefore, unlike the conventional method, the contact point between the V roller l and the steel pipe changes due to a difference in the outer diameter of the steel pipe being fed over the VCvC roller l, or the V row 2 circumferential length tR changes due to wear of the V roller surface, etc. There is a measurement method that is not affected by such factors, has small measurement errors, and can maintain accuracy over a long period of time! be hit.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of a length measuring device when implementing the conventional long material sub-length method, and Fig. 2 is a schematic plan view for explaining changes in the contact point between the V roller and the long material (steel pipe). 3A and 3B are schematic plan views of a sub-length device for carrying out the method according to the present invention. 1...Conveyance roller (V roller), 2...Sub-length pulse generator, 3...-long material, 4
~8... Fixed length detection sensor, 9... Drive motor, 14... Reference length detection sensor. Agent Patent Attorney Toshiyoshi Somekawa

Claims (2)

[Claims] (1) In a length measurement method in which the total length of a core long material is measured while being moved in the longitudinal direction by a long material full conveyance roller, a length measurement pulse generator is attached to the front Qr and 'r conveyance rollers, and multiple A fixed length detection sensor and a reference length detection sensor are arranged along the 411i output line, and the reference length movement of the long material is detected by the reference length detection sensor, and the length measurement pulse generator detects the reference length movement per pulse of the length measurement pulse generator. The length of the remaining portion of the long material outside the fixed length is detected by the fixed length detection sensor, and the number of pulses during that time is counted to determine the length of the remaining portion. How to measure the length of long materials. (2) The sensor for detecting the reference length is provided in front of the sensor for detecting the fixed length at the foremost position in the traveling direction of the long material, and the tip of the long material is installed at the sensor for detecting the fixed length at the foremost position. Passing (
At the same time, the other fixed length detection sensor that was detecting the long material went astray, and the length measurement par 1-
. 0 counting the number of pulses of the pulse generator, and determining the moving length per 1 pulse from the number of pulses until the tip of the long material passes the reference length detection sensor at the timing,
According to claim 1, the length of the remaining portion is determined from the number of pulses until the rear end of the elongated material passes the selected fixed leg length detection sensor using this method. Method for measuring the length of long materials as described.