JP4345542B2 - Coil outer diameter measuring method and apparatus - Google Patents

Description

  The present invention relates to a method and apparatus for measuring the outer diameter of a coil wound up after rolling.

  Conventionally, various methods and apparatuses for measuring the outer diameter of a coil wound after rolling a hot-rolled steel strip, a cold-rolled steel strip, or the like are known.

  For example, Patent Document 1 discloses a technique in which a coil is transported in a tilted state, and an outer diameter of the coil being transported is measured using a light emitting / receiving sensor.

  Further, Patent Document 2 and Patent Document 3 disclose techniques for measuring the outer diameter of a coil by standing still with the coil standing and scanning a non-contact sensor in the vertical direction of the coil.

Also, a method of measuring the outer diameter of the coil by contacting a detection rod or arm for measuring the coil diameter with the upper end of the outer circumference of the coil and measuring the height of the detection rod or arm, a CCD camera or the like A method of measuring the outer diameter of a coil by image analysis from the obtained image and image analysis is well known.
Japanese Patent Laid-Open No. 9-210637 Japanese Unexamined Patent Publication No. 7-98220 Japanese Unexamined Patent Publication No. 7-208974

  However, the above-described conventional technique requires a dedicated sensor and device for measuring the coil, and additionally requires a measurement time for measuring the outer diameter of the coil. Therefore, there is a problem that the equipment cost is increased and the cycle time of coil conveyance becomes long.

  The present invention eliminates the need for dedicated equipment for measuring the outer diameter of the coil, and enables measurement of the outer diameter of the coil with a simple process without affecting the cycle time of coil conveyance. A diameter measuring method and apparatus are provided.

  The present invention uses a sensor that is originally attached to a transfer facility that suspends and transfers a coil, and enables the coil outer diameter to be measured simultaneously during a series of operations for transfer.

  That is, according to the present invention, a non-contact sensor that detects the outer and inner ends of the coil is provided at the tip of the hook, and the lifting position of the lifting / lowering device that lifts and lowers the hook is measured. A coil outer diameter measuring method using a coil conveying device that includes a lifting position sensor, inserts a hook into an inner diameter portion of the coil, and lifts and conveys the coil, the mandrel when the coil is wound up A step of outputting the diameter as a coil inner diameter to the arithmetic device, and when the hook is moved in the vertical direction toward the inner diameter portion of the coil, the end portion is detected by the non-contact sensor to the arithmetic device. A step of outputting, a step of measuring a lift position of the hook by a lift position sensor and outputting the result to the calculation device, and a position of the outer and inner peripheral ends of the coil in the calculation device, And co By calculating based on Le inner diameter is a coil outer diameter measuring method characterized by comprising comprises a step of determining the outer diameter of the coil.

  Further, the present invention is a coil outer diameter measuring device that is attached to a coil conveying device that inserts a hook into an inner diameter portion of a coil and lifts and conveys the coil, and includes an arithmetic device and a tip portion of the hook. A non-contact type sensor that detects the outer and inner ends of the coil and outputs the same to the computing device, and a lifting device that lifts and lowers the hook, and measures the lifting position to the computing device. A lifting position sensor for outputting, and a mandrel diameter output portion for outputting to the arithmetic unit, with a mandrel diameter when the coil is wound as a coil inner diameter, and a hook toward the inner diameter portion of the coil When moving in the vertical direction, the calculation device calculates the positions of the outer and inner ends of the coil, and calculates the outer diameter of the coil by calculating the positions and the inner diameter of the coil. Carp to do An outer diameter measuring device.

  By applying the present invention, it is not necessary to take another time for measurement when measuring the outer diameter of the coil, and the coil conveyance cycle time can be minimized.

  In addition, since the present invention can be implemented with a simple modification of the existing equipment, the measurement itself can be easily performed as part of the transport cycle with almost no new equipment costs.

  The best mode of the coil outer diameter measuring method and apparatus of the present invention will be described in detail with reference to FIG.

  The present invention makes it possible to measure the outer diameter of a coil by using a coil conveying device 2 that lifts and conveys a coil 1 wound by a mandrel after rolling with a hook 2a.

  First, the coil transfer device 2 will be described.

  A non-contact type sensor 3 such as a laser sensor is attached to the tip of a hook 2a such as an L-shaped hook in the coil conveying device 2, and positioning when the hook 2a is inserted into the inner diameter portion (coil hole) of the coil 1. It is used for. In addition, an elevating position sensor 4 such as a pulse generator or an absolute value type distance sensor is attached to the elevating device 2b for elevating and lowering the hook 2a to control the height of the hook 2a. Then, automatic operation is performed based on these sensor signals, and the hook 2a is automatically inserted into the inner diameter portion of the coil 1 to lift and convey the coil 1.

In the present invention, when these sensors are used as they are and the hook 2a descends from above toward the inner diameter portion of the coil 1, the non-contact sensor 3 is turned on at the upper end of the coil 1 in the arithmetic unit 5. and hook position H _1, non-contact sensor 3 in the coil inner diameter part upper end calculates the hook position of H ₂ when turn OFF. However, here, the hook position is defined so that H ₁ > H ₂ .

  Here, the coil inner diameter d is output in advance from the mandrel diameter output unit 6 to the arithmetic unit 5 as information on the mandrel diameter at the time of winding the coil. Note that the information on the mandrel diameter at the time of coil winding set in the mandrel diameter output unit 6 may be set manually by the operator, or automatically set from a host computer not shown here. Also good.

In the calculation device 5, the coil outer diameter D can be easily calculated from the above hook position H ₁ , hook position H ₂ and coil inner diameter d by the following (Equation 1).

D = 2 × (H ₁ −H ₂ ) + d (Formula 1)
Therefore, in the present invention, the coil outer diameter can be easily obtained by using a conventionally used coil conveying device as it is. The time for the measurement is not particularly required, and the coil outer diameter measurement process of the present invention is completed at the same time when the hook is lowered toward the coil inner diameter portion for coil conveyance. For this reason, the present invention hardly affects the cycle time of coil conveyance.

  That is, the present invention uses a non-contact type sensor attached to the tip of a coil lifting (L-shaped) hook used for coil transportation, and when the hook is lowered for coil transportation, The coil outer diameter is calculated from the ON / OFF signal of the non-contact type sensor and the signal of the height position of the hook.

  In the above description, it has been described that the outer diameter of the coil is measured when the hook is lowered toward the inner diameter portion of the coil. However, the measurement is performed when the hook is removed from the inner diameter portion of the coil and raised at the end of coil conveyance. Needless to say, it may be done. In addition, when the initial standby position of the hook is not above the coil as shown in FIG. 1 but below, it can be measured when the hook is raised.

  Furthermore, the conveying device that conveys the coil is not limited to the hook type as described above, and can be similarly applied as long as it is a conveying device that conveys the coil by suspending the coil. Equipment can be introduced at low cost.

  By the way, it is known that when the coil is placed on the floor, it is distorted by its own weight as shown in FIG. Therefore, when the outer diameter of the coil is directly measured in the conventional outer diameter measuring region in the horizontal direction indicated by 12, the outer diameter deviated from the perfect circle is measured, which is larger than the actual outer diameter. Further, when the measurement is performed in the vertical direction of gravity, the measurement is performed smaller than the actual outer diameter, which is a major factor in generating a measurement error of the outer diameter of the coil.

  On the other hand, in the present invention, the measurement area in the present invention shown in 11 is measured, and the outer diameter of the coil is obtained by calculation using the known inner diameter data, so that it is not affected by the above-described coil distortion. In addition, it is possible to obtain an excellent effect that measurement with high accuracy is possible.

It is a schematic diagram which shows the structure of the coil outer diameter measuring apparatus of this invention. It is a schematic diagram which shows a mode that the coil placed on the floor is distorted by its own weight.

Explanation of symbols

1 coil
1a Coil (distorted by its own weight) 2 Coil conveyor
2a hook
2b Lifting device 3 Non-contact sensor (laser sensor)
4 Lift position sensor (pulse generator)
5 Arithmetic Unit 6 Mandrel Diameter Output Unit 7 Coil Stand
11 Measurement area in the present invention
12 Conventional outer diameter measurement area

Claims (2)

A non-contact type sensor for detecting the outer and inner peripheral ends of the coil is provided at the tip of the hook, and the elevating device for elevating the hook is provided with an elevating position sensor for measuring the elevating position. A coil outer diameter measuring method using a coil conveying device that inserts a hook into the inner diameter portion of the coil and lifts and conveys the coil,
A step of outputting the mandrel diameter when winding the coil to the arithmetic unit as the coil inner diameter;
When the hook is moved in the vertical direction toward the inner diameter part of the coil, the non-contact sensor detects the end and outputs the detected value to the arithmetic unit;
Measuring the lifting position of the hook with a lifting position sensor and outputting to the computing device;
In the arithmetic device, obtaining the positions of the outer and inner peripheral ends of the coil, calculating the outer diameter of the coil by calculating based on those positions and the inner diameter of the coil;
A coil outer diameter measuring method characterized by comprising: A coil outer diameter measuring device that is attached to a coil conveying device that inserts a hook into an inner diameter portion of a coil and lifts and conveys the coil,
An arithmetic unit;
A non-contact sensor that is provided at a tip of the hook, detects an outer periphery and an inner periphery of the coil, and outputs to the arithmetic unit;
Elevating position sensor that is provided in an elevating device that elevates and lowers the hook, measures the elevating position, and outputs it to the arithmetic unit;
A mandrel diameter output unit that outputs the mandrel diameter when winding the coil as a coil inner diameter to the arithmetic unit;
Comprising
When the hook is moved in the vertical direction toward the inner diameter portion of the coil, the calculation device calculates the positions of the outer and inner end portions of the coil, and calculates based on those positions and the coil inner diameter. A coil outer diameter measuring device characterized by obtaining an outer diameter of a coil.

Images