JPH0431042B2 - - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention Industrial Field of Application The present invention provides a method for changing the outer diameter of a wire rod in the radial direction and for each maximum outer diameter of the wire rod running in the longitudinal direction. This relates to a device that measures the diameter over its entire length.

BACKGROUND TECHNOLOGY Generally, the outer diameter of a wire rod such as a steel cable is generally measured by pinching the outer circumference with a caliper or the like.

In addition to the above-mentioned measuring method, a measuring method using an optical wire diameter measuring device shown in FIG. 9 (Japanese Patent Application No. 190292/1982) is also known. This measurement method irradiates parallel light from a floodlight 2 toward a one-dimensional line sensor (hereinafter referred to as an image sensor) 3, as shown in FIG.
The shadow of an object 4 placed between the light projector 2 and the image sensor 3 is projected onto the image sensor 3, and the length of the shadow is counted by the bit output of the image sensor 3 to measure the outer diameter of the object 4. Therefore,
This measurement method measures the apparent external dimensions of the object 4 viewed from one direction.

Problems to be Solved by the Invention In recent years, when a wire such as the wire rope 1 shown in FIG. 8 is running at high speed in the longitudinal direction, it has been required to measure the outer diameter of the wire over its entire length. By the way, the wire rope 1 is made by twisting several steel wires together as shown in FIG. It is expressed as Therefore, it is sufficient to measure the maximum diameter of the cross section of the wire rope 1 over its entire length using a caliper, etc. However, since the wire rope 1 is running at high speed, it is better to contact the wire rope 1 with a caliper, etc. Since it is not possible to do so, a non-contact method of measurement using an optical wire diameter measuring device is considered. Therefore, the optical wire diameter measuring device measures the apparent external dimensions of an object when viewed from one direction, and when measuring the external diameter of the wire rope 1, it measures the apparent external dimensions when viewed from the radial direction. The diameter will be measured. However, as shown in FIG. 10, the outer diameter of the wire rope 1 when viewed from the radial direction changes with peak points P ₁ and valley points P ₂ appearing periodically, and the apparent diameter at peak point P ₁ changes. The maximum outer diameter L is equal to the maximum diameter of the cross section of the wire rope 1. That is,
When the apparent outer diameter of a wire having the above-mentioned shape, such as the wire rope 1, is measured using an optical wire diameter measuring device at fine pitches, the maximum measured value is obtained periodically, and this is the value of the wire. This is the maximum diameter of the cross section of the rope 1. However, since the response of the optical wire diameter measuring device requires a certain amount of time, wire rope 1
When the wire rope 1 runs at high speed, the wire rope 1 cannot be measured at a fine pitch, and the pitch becomes coarse, making it impossible to measure the apparent maximum outer diameter of the wire rope 1.

B Means for solving the structural problems of the invention The present invention is characterized in that the outer diameter as seen in the radial direction changes periodically, and that each maximum outer diameter as seen in the radial direction of a wire running in the longitudinal direction is divided into the entire length. It is a device that measures the wire rod from the radial direction, receives and stores the one-dimensional image with an image sensor, and processes the stored image of the wire rod to measure the outer diameter of the wire rod. It includes a wire diameter measuring device and a light emitting/receiving part that sandwiches the wire running in the longitudinal direction, and calculates the amount of transmitted light that enters the light receiving part from the light projecting part in the radial direction through the wire, and continuously measures the outer diameter of the wire. By arranging the light emitting/receiving section at a predetermined distance from the wire diameter measuring device, the point at which the maximum outer diameter of the wire passes through the wire diameter measuring device is detected, and at this point the wire diameter measuring device operates. The sensor is equipped with a maximum point detection sensor that outputs a signal.

Embodiment An embodiment of the present invention will be described below, starting from the schematic configuration shown in FIG. In Fig. 1, 5 is a wire whose outer diameter as seen from the radial direction changes periodically, and 6 is a wire diameter measuring device that measures the outer diameter of the wire 5 when seen from the radial direction, without touching the wire 5. An optical wire diameter measuring device is used to measure the wire diameter, and the wire 5 passes between a pair of light emitting and receiving parts. Reference numeral 7 denotes a maximum point detection sensor that detects continuous changes in the outer diameter of the wire rod 5 viewed from the radial direction and outputs a measurement operation signal to the wire diameter measuring device 6, which will be described later so that detection can be performed without touching the wire rod 5. An optical differential system is used, and the wire 5 passes between two sets of light emitting and receiving parts.

Reference numeral 8 denotes a control section for the wire diameter measuring device 6 and the maximum point detection sensor 7, which connects the respective light emitting and receiving sections.

The above schematic configuration will be described in more detail. First, since the maximum outer diameter portion of the wire 5 as viewed from the radial direction appears at regular intervals, the wire diameter measuring device 6
The measurement operation signal outputted from the wire has a constant period when the wire runs at a constant speed, and the phase of the wire 5 passing through the light emitting/receiving section of the wire diameter measuring device 6 is always the same when the signal is output. Moreover, since this phase is determined by the distance between the light emitting and receiving part of the maximum point detection sensor 7 and the light emitting and receiving part of the wire diameter measuring device 6, when the above signal is output, the light emitting and receiving part of the wire diameter measuring device 6 is The above-mentioned interval is set so that the maximum outer diameter part of No. 5 passes through.

The wire diameter measuring device 6 is an optical wire diameter measuring device that causes a light source to emit light in synchronization with the output signal from the maximum point detection sensor 7 and measures the maximum outer diameter portion of the wire 5 as viewed from the radial direction. For example, to show the principle of measurement operation by the optical wire diameter measuring device shown in FIG. 9, first, the light source 2 which is the light projecting section
emits pulse light. When a clock pulse is applied to the image sensor 3 immediately after the object 4, that is, the light in which the maximum outer diameter of the wire 5 is in the shadow, enters the image sensor 3, which is the light receiving part, each photocell 3a in the image sensor 3 A pulse train corresponding to this is output. The maximum outer diameter of the wire 5 is measured by calculating the period corresponding to the shadow of this pulse train. The above measurement operation is controlled by the control section 8.

The maximum point detection sensor 7 detects continuous changes in the outer diameter of the wire 5 as viewed from the radial direction by an optical differential method using two detection sensors 7'a and 7'b shown in FIG. The wire diameter measuring device 6 outputs a measurement operation signal. The measurement operation principle of the detection sensor 7' is the second
As shown in the figure, the wire 5 is irradiated with light rays emitted from a light source 9, which is a light projecting part, and made parallel by a lens 10 from the radial direction, and the transmitted light rays are collected by a lens 11 and the total amount of light is integrated. This is to calculate the outer diameter. According to the optical differential system, as shown in FIG. 3, when one detection sensor 7'a is looking at the maximum outer diameter of the wire 5, the other detection sensor 7'b is looking at the minimum outer diameter of the wire 5. They are arranged as you can see. When each detection sensor 7'a, 7'b detects the maximum outer diameter of the wire 5, the output is the lowest, and when the minimum outer diameter is detected, the output is the highest. Therefore, the wire 5 runs in the longitudinal direction and the detection sensors 7'a,
7'b, the output of the detection sensor 7'a becomes as shown in Fig. 4, and the output of the detection sensor 7'b becomes as shown in Fig. 5. The phase is opposite. Then, if we take the difference between the two outputs,
The DC component L is cut off, and a stable output is obtained as shown in FIG. Here, if the output curve shown in Fig. 6 is converted into a pulse curve with the same period as shown in Fig. 7, the maximum outer diameter of the wire 5 will appear at the same period as the rising point or falling point of this pulse curve. . Therefore, a measurement operation signal is output to the wire diameter measuring device 6 at this point. The above measurement operation is controlled by the control section 8.

Due to the principle of the measurement method, the above measurement requires that the wire 5 move relative to the measuring device, and the stationary measuring device cannot measure the stationary wire 5.
There is a relative minimum movement speed of That is, since the minimum repetition rate of the image sensor 3 is about 10 times/sec, for example, for the wire 5 that has the maximum outer diameter at a pitch of 30 mm, 30 mm x 10 times = 300 mm/sec (18 m/sec).
min). Measurements below this are based on conventional measurements. Further, the relative maximum moving speed of the wire 5 is determined by the maximum detection speed of the measuring device and the pitch of the maximum outer diameter of the wire 5. For example, if the maximum detection speed is
For wire rod 5 where the maximum outer diameter appears every 10 mm pitch at 400 times/sec, 10 mm x 400 times/sec = 4000 mm/sec
(240m/min). For wire rods 5 whose relative moving speed is higher than this, measurements are made at every other pitch of the maximum outer diameter of the wire rod 5.

C. Purpose of the Invention According to the present invention, the outer diameter of a wire rod that changes periodically when viewed from the radial direction and that moves at high speed in the longitudinal direction, such as a steel cable made by twisting several steel wires, When measuring the diameter over the entire length, the point at which each apparent maximum outer diameter portion of the wire passes through an optical wire diameter measuring device is detected, and at this point the optical wire diameter measuring device measures the apparent maximum outer diameter of the wire. Since the diameter is measured, there is no need to use an optical wire diameter measuring device to measure the outer diameter of the wire at fine pitches in the longitudinal direction and detect the apparent maximum outer diameter. Even if it moves, it is possible to measure the outer diameter over its entire length.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of an outer diameter measuring device according to the present invention, and FIG. 2 is a schematic diagram of a detection sensor constituting a maximum point detection sensor included in the present invention.
Figure 3 is a layout diagram of two detection sensors configured as maximum point detection sensors, Figures 4 and 5 are waveform diagrams of each output of the two detection sensors, and Figure 6 is their combined waveform. Figure 7 is a pulse waveform diagram obtained by converting the waveform in Figure 6, Figure 8 is a perspective view of a wire rope, Figure 9 is a schematic diagram of an optical wire diameter measuring device, and Figure 10 is a view from the radial direction. FIG. 2 is a schematic diagram of a wire rope 1. 3... Image sensor, 5... Wire rod, 6... Wire diameter measuring device, 7... Maximum point detection sensor.

Claims (1)

[Claims] 1. A device whose outer diameter as seen in the radial direction changes periodically and that measures each maximum outer diameter as seen in the radial direction of a wire running in the longitudinal direction over the entire length,
A wire diameter measuring device that projects light onto the wire from the radial direction, receives and stores the one-dimensional image with an image sensor, and measures the outer diameter of the wire by processing the stored image of the wire. It includes a light emitting/receiving section that sandwiches the traveling wire, and calculates the amount of transmitted light that has entered the light receiving section through the wire in the radial direction from the light emitting section, detecting continuous changes in the outer diameter of the wire, and detecting the continuous change in the outer diameter of the wire. The maximum point detection sensor detects the point in time when the maximum outer diameter part of the wire passes through the wire diameter measuring device by placing the part at a predetermined distance from the wire diameter measuring device, and outputs an operation signal to the wire diameter measuring device at this point. An outer diameter measuring device characterized by comprising: