JPH10277645A - Device for detecting abnormal member carried on steel plate carrying line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection device free from any secular degradation, wear or breakage by measuring the thickness of a center part of a steel plate by a non-contact type center part displacement meter to judge presence/absence of any lapped part of steel plates, measuring the displacement of a side part by a side part displacement meter, and combining both measurement results to judge presence/absence of any warp of the steel plate. SOLUTION: An upper center part displacement meter 12A and a lower center part displacement meter 12B measure the thickness of a center of a steel plate 1 to detect presence/absence of the lapping of the steel plate 1. The upper center part displacement meter 12A detects the warp in the longitudinal direction of the steel plate 1. A pair of side part displacement meters 13A, 13B measure the displacement of the side parts of the steel plate 1. The difference between the indicated value by the upper center part displacement meter 12A and the indicated value of the side part displacement meters 13A, 13B is operated to detect the warp in the width direction of the steel plate 1. An abnormal plate judging means 16 compares the detected warp in the longitudinal direction or the detected warp in the width direction with the preset allowable value in a plate information setting means 17, and judges to be abnormal when the detected value exceeds the allowable value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an abnormal material conveyed on a steel sheet conveying line, and more particularly, to an apparatus for detecting an abnormal material being conveyed on a steel sheet conveying line. The present invention relates to a device for detecting an abnormal material that is conveyed on a steel sheet conveying line and that can detect an abnormal material such as a defective shape in a non-contact manner with high accuracy.

[0002]

2. Description of the Related Art For example, an automatic ultrasonic flaw detector installed in a steel plate factory for manufacturing steel plate (hereinafter simply referred to as a steel plate) has a sub-line (off-line) separated from a rolling and shearing line which is a main process. ). The steel plate to be inspected is suspended on a transport line by a crane or the like, and transported into an automatic ultrasonic inspection device. At this time, the abnormal material may be transported into the automatic ultrasonic flaw detector.
Here, the abnormal material means the following. A two-ply steel sheet that is hung on a transport line in a state where two sheets are overlapped and transported in this state. An end warped steel sheet whose end is warped upward or downward in the conveying direction or width direction. A steel plate whose thickness or length does not match what should be flawed.

Therefore, detecting and dealing with an abnormal material as early as possible before the abnormal material is conveyed into the automatic ultrasonic flaw detection apparatus can reduce damage to the flaw detection apparatus and decrease the efficiency of flaw detection processing. It is extremely important in preventing it.

Conventionally, in order to detect a double-layer steel plate, FIG.
And the two-layer detection device 2 as shown in FIG. FIG. 7 is a front view showing an installation mode of the two-sheet detection device, and FIG. 8 is a front view showing a state immediately before a limit switch of the two-sheet detection device is operated.

The double sheet detecting device 2 includes a roller 4 which is moved up and down by a cylinder 3 and a limit switch 5 attached to the roller 4. Is detected. That is, after the leading end of the steel sheet 1 has passed through the double sheet detecting device 2, the roller 4 is raised by the cylinder 3 together with the limit switch 5 until the roller 4 contacts the lower surface of the steel sheet 1 based on the tracking information from the upstream side. When the overlapped portion passes through the limit switch 5, the limit switch 5 is operated, and the overlap of the steel sheet 1 is detected.

The detection of the end warpage of the steel sheet 1 has been performed by an end warp detecting device 7 as shown in FIGS. 9 is a front view showing the end warpage detection device 7, FIG. 10 is a front view showing an installation mode of the end warpage detection device 7,
FIG. 11 is a side view showing an installation mode of the end warpage detection device 7.

The end warpage detecting device 7 includes a transport roller 6
A rod lever 9 provided with a balance weight 8 attached thereto, a cam 10 attached to the base of the rod lever 9, and a limit switch 11 operated by rotation of the cam 10, as follows. The end warpage of the steel sheet 1 conveyed by the conveying roller 6 is detected. That is, when the rod lever 9 hits the warped portion of the end of the steel plate 1 while the steel plate 1 is being conveyed and tilts, the cam 10
Rotates the limit switch 11 to detect the end warpage of the steel plate 1.

[0008]

However, the above-described conventional double-sheet detecting device 2 has the following problems.

After the tip of the steel sheet 1 has passed through the two-ply detection device 2, there is a dead zone of about 200 mm from the tip of the steel sheet 1 before the roller 4 contacts the lower surface of the steel sheet 1. Therefore, as shown in FIG. 12, when the end of the upper steel plate 1A protrudes from the end of the lower steel plate 1B, and this protruding length is shorter than the length of the dead zone, it is not possible to detect the overlap of two sheets. As shown in FIG. 13, even when the two steel plates 1A and 1B are overlapped without displacement, or as shown in FIG. 14, even when the end of the lower steel plate 1B protrudes from the end of the upper steel plate 1A, the two sheets are stacked. Cannot be detected. To solve the problem of the dead zone, the conveying speed of the steel plate 1 may be reduced, but the flaw detection efficiency is reduced.

The above-mentioned conventional end warpage detecting device 7 has the following problems. Since it is a contact type, deterioration, wear and breakage are likely to occur over time, and the warpage in the transport direction of the steel sheet 1 can be detected, but the warp in the width direction orthogonal to the transport direction of the steel sheet 1 cannot be detected. In addition, a detection error occurs due to the vibration of the steel plate 1 generated during the conveyance.

Accordingly, an object of the present invention is to provide a non-contact type, capable of detecting the overlap of two sheets irrespective of the degree of overlap, and having no danger of aging, abrasion, and breakage due to the non-contact type, and a conveyance direction and a plate width. Direction warpage can be detected, and
It is an object of the present invention to provide an apparatus for detecting an abnormal material conveyed on a steel sheet conveyance line without a detection error due to vibration of the steel sheet during conveyance.

[0012]

According to the first aspect of the present invention,
A pair of central displacement meters for measuring the displacement of the central portion in the width direction of the steel plate, provided opposite to each other above and below the transfer line with the transfer line for the steel plate therebetween,
A pair of side displacement meters for measuring the displacement of the width direction side portion of the steel plate, provided on one side of the pair of central portion displacement meters at intervals in a direction orthogonal to the transport line, An abnormal material determination unit for determining whether the steel sheet transported on the transport line is an abnormal material,
The abnormal material determination unit is configured to determine the length of the steel sheet based on the detection signal of the steel sheet from any one of the pair of central displacement meters and the pair of side displacement meters and the conveyance speed of the steel sheet. And the thickness of the steel sheet is detected by a displacement signal from the pair of central displacement meters, and the end of the steel sheet is warped in the transport direction by a displacement signal from any of the pair of central displacement meters. And detecting the presence or absence of overlap of the steel plates, detecting the warpage in the width direction of the end portion of the steel plate by a displacement signal from the pair of side displacement meters and the one central displacement meter, and detecting these values It is characterized in that it is determined whether or not the steel sheet is an abnormal material by comparing with the respective allowable values set in advance.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an apparatus for detecting an abnormal material conveyed on a steel sheet conveying line according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an abnormal material detecting apparatus according to the present invention, FIG. 2 is a view as seen from an arrow A in FIG. 1, FIG. 3 is a view as seen from an arrow B in FIG. 2, and FIG. Graph showing the indicated values, FIG.
FIG. 6 is an explanatory diagram of a method of detecting end warpage in the transport direction, and FIG. 6 is an explanatory diagram of a method of detecting end warpage in the plate width direction.

In FIGS. 1 to 6, 12A and 12B
Are a pair of central part displacement meters for measuring the displacement of the central part in the width direction of the steel plate 1. Central displacement meter 12A, 12B
Are provided above and below the steel sheet 1 so as to face each other with the conveyance line interposed therebetween. 13A and 13B are:
This is a pair of side displacement meters for measuring the displacement of the width direction side portion of the steel plate 1. The side displacement gauges 13A and 13B are provided on both sides of one of the central displacement gauges 12A and 12B (in this example, the upper central displacement gauge 12A) at intervals in a direction orthogonal to the transport line. The center displacement meters 12A and 12B and the side displacement meters 13A and 13B are non-contact reflection displacement meters such as laser distance displacement meters.

Reference numeral 14 denotes a pulse generator for detecting the transport speed of the steel sheet 1, and a speed detection signal from the pulse generator 14 is sent to abnormal material determination means described later. 1
5 is an automatic ultrasonic flaw detector installed on the transport line of the steel sheet 1, 16 is an abnormal material determining means for determining whether the steel sheet 1 transported on the transport line is an abnormal material, 1
Reference numeral 7 denotes a plate information setting device for inputting plate information such as the length and thickness of the steel plate 1 to the abnormal material determining means 16 in advance. 18
Are alarm means for issuing an alarm in response to a command from the abnormal material determining means 16 when the abnormal material determining means 16 determines that the steel sheet 1 is an abnormal material; Is a transport roller control means for controlling the operation of the transport roller 6 in accordance with a command from the abnormal material determination means 16 when it is determined that is an abnormal material.

Next, the function of the abnormal material judging means 16 will be described with reference to FIG.
This will be described with reference to FIG. In each figure,
Means the following. L_A: Upper center displacement meter 12A and transport line (transport roller
Distance from top surface), L_B: Distance between the lower center displacement meter 12B and the transfer line
Release, l_a: Distance between the upper central displacement meter 12A and the upper surface of the steel plate 1
Release, l_b: Distance between the lower central displacement meter 12B and the lower surface of the steel plate 1
Release, l_c: Distance between the side displacement gauge 13A and the upper surface of the steel plate 1, l_d: Distance between the side displacement gauge 13B and the upper surface of the steel sheet 1, t: thickness of the steel sheet 1, a: warpage height of the steel sheet 1. A pair of central displacement gauges 12A and 12B and a pair of sides
Any one of the displacement sensors 13A and 13B (this example
Now, the detection signal of the steel sheet 1 from the lower central displacement meter 12B)
The length of the steel sheet 1 is detected based on the transport speed of the steel sheet 1. under
The detection signal of the steel plate 1 from the central displacement meter 12B is shown in FIG.
The waveform is as shown in FIG. That is, before the steel sheet 1 passes
Is the finger of the lower center displacement meter 12B to exceed the measurement range.
The indicated value (displacement signal) is saturated and the
It becomes the measurement range at the time of imaging. Steel plate 1 has no warpage and thickness
If normal, the indicated value of the lower central displacement meter 12B
Is (l _b= L_B). This timing and the rear end of the steel plate
Until the rear end position of the steel plate exceeds the measurement range
Time and speed of transport roll 6 by pulse generator 14
The length of the steel plate 1 is detected from the degree. In accordance with the indicated values of the pair of central displacement
Then, the thickness (t) of the steel sheet 1 is measured. In other words,
After receiving the over signal, the upper center part as shown in FIG.
Indicated value (l_a), As shown in FIG.
Indicated by the lower central displacement meter 12B (l_b), Preset
(L_A) And (L_B) From the following equation (1):
The thickness (t) of the steel sheet 1 is calculated.

[0018] _{t = L A + L B -} (l a + l b) --- (1) after receiving a steel tip passage signals, indication of the central displacement gauge 12A on shown in FIG. 4 (B) (l _a ) To detect the warpage of the end portion of the steel sheet in the transport direction. That is, as shown in FIG. 5, the warpage height (a) is calculated by the following equation (2).

[0019] _{a = L A -t-l a} --- (2) In addition, in the case of the lower central displacement gauge 12B is warp height (a) is calculated by the following equation (3).

A = L _B −l _b --- (3) The presence or absence of the overlap of the steel plates 1 is detected based on one of the indicated values of the pair of central displacement meters 12A and 12B. That is, for example, as illustrated in FIG. 12 to FIG. 14, the overlapping modes of the steel plates 1 are considered. However, as illustrated in FIG. 13, when the two steel plates 1 </ b> A and 1 </ b> B overlap without displacement, Can be detected by measuring the plate thickness. At this time, the indicated value of the upper central displacement meter 12A has a waveform as shown in FIG. When the end of the upper steel plate 1A protrudes from the end of the lower steel plate 1B, the indicated value of the lower central displacement meter 12B changes as shown in FIG. Is detected. When the end of the lower steel plate 1B protrudes from the end of the upper steel plate 1A, the indicated value of the upper central displacement meter 12A changes as shown in FIG. 4 (F). Detects double overlap. Warp in the width direction of the end portion of the steel plate is detected based on the pair of side displacement meters 13A and 13B and the indicated value of the upper center portion displacement meter 12A. That is, as shown in FIG.
3A, 13B indication of (l _c), to detect each and indicated value of the upper central portion displacement gauge 12A calculates the difference between the (l _a), the width direction of the warp of the steel sheet edge portions of the (l _d) . These detected values are compared with respective allowable values set in advance by the plate information setting unit 17, and if the allowable values are exceeded, it is determined that the material is abnormal.

When the abnormal material judging means 16 judges that the steel sheet 1 is abnormal, the abnormal material judging means 16 immediately issues an alarm command to the alarm means 18, and at the same time, sends the alarm to the conveying roller control means 19. By issuing an operation stop command, the abnormal material is prevented from being transported into the automatic ultrasonic flaw detector 15 beforehand. Thus, it is possible to reliably prevent the abnormal material from colliding with the flaw detection apparatus and damaging the flaw detection apparatus or reducing the flaw detection processing efficiency.

[0022]

As described above, according to the present invention, whether the steel sheet is abnormal or not based on the detected values from the pair of non-contact center displacement meters and the pair of non-contact side displacement meters. By judging whether there is no dead object, it is possible to detect the overlap of two sheets irrespective of the degree of overlap, and since it is a non-contact type, there is no risk of aging, abrasion, or breakage. Part warpage can be detected, there is no detection error due to vibration of the steel sheet during transportation, and it is possible to prevent the abnormal material from colliding with the flaw detector and damaging the flaw detector or preventing the flaw detection processing efficiency from decreasing. Various useful effects are provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an abnormal material detection device according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a view as seen in the direction of arrow B in FIG. 2;

FIG. 4 is a graph showing indicated values of a displacement meter.

FIG. 5 is an explanatory diagram of a method of detecting an end warpage in a transport direction.

FIG. 6 is an explanatory diagram of a method of detecting an end warp in a plate width direction.

FIG. 7 is a front view showing an installation mode of the two-sheet detection device.

FIG. 8 is a front view showing a state immediately before a limit switch of the two-ply detection device is operated.

FIG. 9 is a front view showing the end warpage detection device 7.

FIG. 10 is a front view showing an installation mode of the end warpage detecting device 7;

FIG. 11 is a side view showing an installation mode of the end warpage detection device 7;

FIG. 12 is a front view showing a state in which an upper steel plate end portion is projected from the lower steel plate end portion and overlaps.

FIG. 13 is a front view showing a state in which two steel plates overlap without displacement.

FIG. 14 is a front view showing a state in which an end portion of a lower steel plate protrudes from an end portion of an upper steel plate and overlaps with each other.

[Explanation of symbols]

 1: Steel plate 1A: Upper steel plate 1B: Lower steel plate 2: Double stack detection device 3: Cylinder 4: Roller 5: Limit switch 6: Transport roller 7: End warpage detection device 8: Balance weight 9: Rod lever 10: Cam 11: Limit switch 12A: Upper center displacement meter 12B: Lower center displacement meter 13A: Side displacement meter 13B: Side displacement meter 14: Pulse generator 15: Automatic ultrasonic flaw detector 16: Abnormal material determination means 17: Plate information setting Means 18: Alarm means 19: Transport roller control means

Claims (1)

[Claims] 1. A pair of central displacement meters for measuring a displacement of a central portion in a width direction of the steel sheet, which are provided oppositely above and below the transport line with the steel sheet transport line interposed therebetween, respectively. A pair of side displacement meters for measuring the displacement of the width direction side portion of the steel plate, provided on one side of the pair of central portion displacement meters at intervals in a direction orthogonal to the transport line, An abnormal material determining means for determining whether the steel sheet transported on the transport line is an abnormal material, wherein the abnormal material determining means includes the pair of central portion displacement meters and the pair of sides. The length of the steel sheet is detected from the detection signal of the steel sheet from any one of the displacement meters and the transport speed of the steel sheet, and the steel sheet is detected by a displacement signal from the pair of central displacement meters. Of the pair of central portions The presence or absence of the warp in the transport direction of the steel plate end portion and the overlap of the steel plates is detected by a displacement signal from any of the position meters, and the displacement signal from the pair of side displacement meters and the one central portion displacement meter is used. Detecting a warp in the width direction of the steel plate end portion, and comparing these detection values with respective preset allowable values to determine whether the steel plate is an abnormal material. A detection device for abnormal materials conveyed on a steel sheet conveyance line.