JPS5981508A - Measuring device for straightness of steel material strip between runs - Google Patents

Abstract

PURPOSE:To measure the straightness of a steel material strip between runs in a short time with high precision by providing an arithmetic processor which inputs a signal from a detecting means for the movement speed of a long-sized metallic material and a distance detection signal for the distance to a side surface of the long-sized metallic material from a distance detecting means and calculates the curvature extent of the long-sized metallic material. CONSTITUTION:When a rail material runs on a conveyance table 10 from the right, the amounts of displacement detected by respective capacity type sensors 1-3 are amplified by amplifiers 4-6, which supply DC voltages proportional to the amounts of displacements to a signal processor 9. The signal processor 9 also inputs the movement speeds of the rail material detected by speed detectors 7 and 8 as line speeds. The signal process 9 reads the respective signals by an A/D converter to calculate the straightness to the overall length of the rail by a model. The result of the calculation is displayed and recorded on a display recorder 10. A checker decides on whether the rail material is within a permissible range or not by the result.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the straightness of a steel bar during running.

Rails, steel sheet piles, H-beams, etc. have complex shapes, and during the rolling process and cooling, bends and warps occur in the longitudinal direction, which requires straightening work. However, depending on the state of bending or unevenness, it is not always possible to ensure straightness that satisfies the user's requirements.

Currently, the straightness of long steel products is measured by an examiner of 2 Å or more, applying a standard straightness tester (for example, stretch) to the long steel material.
The clearance between the bar and the steel bar is measured, and the amount of bending in units of meters is calculated to determine whether or not it is within the allowable limit. Therefore, there are the following problems. (1) Individual variations occur depending on the measurer.

(2) Bars, etc. must be stopped during measurement.

(3) Measurement takes time.

In order to solve these problems, Japanese Patent Laid-Open No. 57-61907 and the like have been proposed, but no fundamental solution has been reached. In other words, although problem (1) has been resolved, (2) and (3
) issues remain unresolved.

Therefore, the present invention basically solves these problems and proposes a device that quickly measures straightness during running.

Non-contact position measurement methods for steel bars include a laser method that uses a laser, an eddy current gear gauge that uses eddy current, and the like. These two methods have the following disadvantages. That is, since the laser method measures 1σ of a small area (approximately 2 ψ) in a certain place, it is affected by irregularities on the surface of the bar steel and substances attached to the light surface. The eddy current method is affected by the electrical resistance determined by the composition of the steel bar.

In addition, during measurement during running, the measurement position shifts due to the vertical vibration of the steel bar (rail) 20 (indicated by dotted lines and arrows) as shown in Fig. 1, and this shift causes large errors in measurement. occurs. In this figure, 21 is a laser distance meter, 22
indicates a vortex flow gap meter. The present invention has been developed after various studies to solve these drawbacks. The present invention will be explained in detail below with reference to drawing VC.

FIG. 2 shows the basic principle of the capacitive sensor of the present invention.

This measurement principle was previously proposed in Japanese Patent Application No. 56-66397. As shown in FIG. 2, an AC transmitter 4a is connected to one electrode 23.
25 is connected to the other electrode 24, and an AC amplifier 26 is connected to the other electrode 24. This method consists of a detector 27 and an object to be measured 2.
The capacitance C between the electrodes 23 and 24 is proportional to the distance t from 0
Measure x.

Next, the present invention will be explained using the rail material shown in FIG.

The straightness of the rail material is usually measured at the head 20a. 20b is the abdomen. As shown in FIG. 3(,), if the height H of the electrode of the capacitive sensor (hereinafter referred to as capacitive sensor) 27 is about 2 h with respect to the height h of the head 20a, the rail The error for the vertical vibration of 20 is as shown in FIG. In other words, the characteristic is that it is completely unaffected by vibrations within ±10 degrees.

Furthermore, as shown in Fig. 3(b), similar results were obtained when the abdominal 20b measurement volume was used with the formula 7 analyzer (however, h'
220 tars +H').

FIG. 5 shows a measurement system for an online running straightness meter for rail materials according to the present invention. This system is comprised of capacitive sensors 1 to 3 for head position measurement, amplifiers 4 to 6, a rail material movement speed detector 7, a signal processor 8, and a display/recording device 9. 10 is a display/recording device; 11 is a transport table; 11
a is its transport roll. As shown in FIG. 5(a), capacitive sensors are arranged at three locations. The geometrical arrangement is shown in the figure (,). The distance W between the capacitive sensors 1, 2, and 3 is determined by the width of the head of the rail and the measured length of the capacitive sensors. The distance between the capacitive sensors 1 and 2 is determined by the permissible straightness limit. Also, capacitive sensor l~
The three-dimensional configuration of No. 3 is shown in the same figure (b).

Two capacitive sensors are placed on the same side and one on the opposite side.
Place it in several places. The reason is that when conveying rail materials, vibrations occur horizontally, vertically, and vertically, and countermeasures against vertical vibrations are as described above. If there is left-right vibration, the influence cannot be prevented even if a plurality of sensors are arranged on the same surface. For this purpose, it was placed on the opposite side. In addition, in the case of this device,
Since the two locations on the same surface are arranged, opposing areal capacitance type sensors 3 are also required as a measure to improve the accuracy of straightness.

The moving speed of the rail material is detected at two locations. Generally, the speed of transfer is determined by the rotation of the rolls of the transport table 10. In reality, the moving speed fluctuates due to slips, etc., so to prevent this, the speed is measured at two locations. If you use a non-contact speedometer that makes full use of a spatial filter, it is possible to measure absolute speed.

As shown in FIG. 5(,), when the right side rail material runs on the conveying table 10, the speed of the rail material is first detected by the speed detector 7.8. Capacitive sensor 2 then detects the arrival of the rail. In addition, a capacitive sensor 3°1 detects. When the capacitive sensor 1 detects the arrival of the rail, the signal processor 9 starts calculating the straightness. The displacement amount (distance between the capacitive sensor and the rail) detected by each capacitive sensor 1, 2.3 is amplified by an amplifier 4, 5.6. Amplifiers 4, 5.6 are AC oscillators, AC amplifiers, filters, and AC/D
Built-in C converter. The amplifier 4.5.6 provides the signal processor 9 with a direct current (DC) voltage proportional to the amount of displacement. The signal processor 9 includes a speed detector 7 that detects the moving speed of the rail material.
, 8 and input as the line speed.

The line speed is at maximum lrQ/see, and the average speed is determined from the outputs of both speed detectors 7.8. Note that either one of these may be used.

The signal processor 9 reads each signal using an A/D converter. The reading cycle is made proportional to the line speed Vc. Now, if the line speed of the speed detectors 7 and 8 is vc, and the reading period is Δt, then as shown in FIG. t
+), (however, tz = t, 10Δt, t3=t2+Δ
t). Therefore, the sampling state of Δ for each time is
The result is as shown in FIG. 6(a).

The displacement t of the capacitive sensors 1 and 2 from the single rail material is 1,
, 12. Since the sensor interval is L, the gradient can be found.

The displacement amount of the valley type 11 sensor 3 is tz, and the position of point d at L/2 is d = W - (A3 + W') where W' is the width of the rail head. Therefore, the state shown in FIG. 6(b) can be continuously obtained.

The signal processor 9 calculates the straightness over the entire length of the rail based on the model. The calculated results are displayed on the display/recording device 1.
0 is displayed and recorded. The examiner uses the results to determine whether or not the results are within the allowable limits. It is possible to automatically determine whether the output signal of the signal processor 9 is input to a process load-bearing block or the like.

The moment the rail is transported and passes the position of the capacitive sensor 2, the amount of displacement of the capacitive sensor 2 becomes maximum.

Therefore, the output voltage of the amplifier 5 is also maximum 9, and the signal processor 9
detects the passing of a rail, stops model calculation, and enters a waiting state for the arrival of the next rail.

The online straightness measurement method of a rail material during running according to the present invention has been described above. The present invention further has the following features.

(1) It can also be applied to materials other than rails, such as steel bars (sheet piles, shaped steel, etc.), steel pipes, etc.

(2) Sensors must be installed in at least two locations on the same surface and at least one location on the opposing surface. As a result, straightness can be measured with high accuracy, almost unaffected by vibrations of the material to be measured.

(3) Since it is a non-contact measurement, the device is simple and maintainability is very good.

(4) Although an example of measurement using a capacitive sensor has been shown, there is no particular concern as long as the error in vertical vibration of the material amount is small.

(5) Can measure cold and hot materials.

Next, examples will be given. Figures 7(a) and 7(b) show the measured values during stretching and the measured values during online running. The line speed is 0.5 m/see, the target is rail material, and the sensors are capacitive sensors measuring lengths of 10 to 80 mrn, and there are 3 units. It can be seen that the measurements are made with high precision.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the measurement principle of the conventional method.
The figure is an explanatory diagram showing the basic principle of the capacitive sensor used in the present invention, and Fig. 3 is an explanatory diagram showing the installation position of the sensor with respect to the material to be measured and the structure of the sensor in the present invention. Figure 4 is a graph showing the measurement error due to vertical vibration of the fixed material to be measured, Figure 5 is a professional diagram showing the straightness measurement system of the present invention, and Figure 6 is an explanatory diagram showing the sampling situation. Figure 7 is a graph showing a comparison of actual stretch measurements. In the drawings, 11 is a conveyance path, 20 is an i-scale metal material, 7.8 is a speed detector, 1 to 3 are distance detection means, and 9 is an arithmetic processing unit. February 7, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case, Patent Application No. 192170 of 19872, Title of the invention Device for measuring the straightness of a bar during running 3, Person making the correction Relationship to the case Patent applicant address 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (6
65,) Nippon Steel Corporation Representative Takeshi 1) Yutaka 4, Agent 〒101 6. Number of inventions increased by amendment None 7. Column for detailed description of the invention and drawings in the specification subject to amendment (1) Correct rh'220■+H/J on page 4, line 12 of the specification to rh'>20+H'J. (2) On page 4, lines 16 to 18, "detector 7 - display/recording device," is corrected to "composed of detectors 7, 8, signal processor 9, and display/recording device 10." (3) Correct "transport table 10" on page 5, line 16 to "transport table 11". (4) Amend Figure 5(a) of the drawing as shown in the attached sheet.

Claims (1)

[Claims] An apparatus for measuring the curvature of a long metal material moving on a conveyance path, the device comprising: means for detecting the moving speed of the long metal material; and at least three measuring surfaces 1 for each of the long metal materials. Distance detecting means for non-contactly measuring the distance of the long metal material are disposed on both sides along the longitudinal direction of the long metal material,
an arithmetic processing device which receives a signal from the elongated metal material movement speed detection means and a distance detection signal from the distance detection means to the elongated metal material 111 surface, and calculates the curve of the elongated metal material; Straightness measurement device for long steel products during running.