JPH105864A - Coil drawing control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the excellent precision with the same system both for a light coil and a heavy coil by setting the pressure in consideration of the weight of each coil, and controlling the rise of a coil car arm. SOLUTION: The hydraulic pressure required for lifting a coil is operated by a process controller 10 to obtain the pressure set value Ps, and reception of the coil by a coil car 5 is judged by the rise of the coil car to reduce the diameter of a reel 3, and the diameter of the reel 3 is reduced concentrically with the coil to facilitate drawing of the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripping process in a case where a coil obtained by winding a strip-shaped steel plate is taken out from a take-up reel and transferred to the next process in a steel plate processing and inspection line in general industry, and more particularly to a reeling process. The extraction method.

[0002]

2. Description of the Related Art In a steel plate processing and inspection line of general industry, a coil wound around a strip-shaped steel plate is removed from a take-up reel and transferred to the next step.

[0003] Fig. 3 is a conceptual diagram of this, in which a take-up reel (drum) 3 is driven while the rotation of a motor 1 is reduced by a speed reducer 2, and a steel plate is wound around this reel to form a coil 4.

When winding a steel sheet, the outer diameter of the take-up reel 3 is enlarged, and the steel sheet is wound there. Then, after winding the set plate length, the arm 5a of the coil car 5 is lifted by the hydraulic cylinder 5b, the outer diameter of the take-up reel is reduced, the take-up reel is taken out from the take-up reel, and transported to the next step.

[0005] The coil is extracted in the next step by measuring the coil winding length and the coil diameter in advance by a process controller.

End of winding → Coil car rise → Stop before touching (touch) coil (performed by coil diameter calculation data)
→ Reducing diameter of take-up reel → Move to side of coil car → Move outside take-up reel → Go to next process

[0007]

In the above conventional method,
There are the following issues.

(1) The amount of movement of the expansion and contraction of the reel diameter becomes a clearance at the time of extraction, but cannot be made so large because of the structure. Therefore, if the calculation error of the coil diameter is large, the reel may be lifted and damaged.

(2) Since the weight of the coil is different, the flow amount from issuing the stop command to the standstill is different, and the accuracy is not obtained.

(3) When a rubber sleeve is mounted on an iron reel to prevent scratches, the clearance between the reel and the inner diameter of the coil becomes narrow, making it difficult to automatically remove the coil.

(4) The coils handled in the winding line are light to heavy in weight, and energy is lost when controlled at a constant hydraulic pressure.

(5) In the method of stopping the coil car before it comes into contact with the coil and reducing the diameter of the reel, an error in the stop position of the coil car results in a gap error between the upper and lower portions of the reel, and automatic extraction cannot be performed.

[0013]

In the present invention, a means for solving the above-mentioned problems is to calculate a hydraulic pressure required to lift a coil, determine a pressure set value, and control a hydraulic pressure to the set value. The coil weight does not affect the stopping accuracy to improve the accuracy, and after confirming that the coil has been received (lifted) by the coil car rising amount, the winding reel is reduced in diameter to reduce the coil. The diameter of the coil is reduced concentrically with the inner diameter of the coil to make the gap between the inner diameter of the coil and the outer diameter of the take-up reel uniform so that the coil can be easily extracted.

The pressure set value P _S is determined by calculating the following equation.

P _S = K (WK + WC + α) kg / cm ² where K = pressure gradient (weight and required hydraulic characteristics) WK = coil car arm's own weight WC = coil sectional area × width × specific gravity (7.85) × occupation Rate (0.99) α = bias (correction of pipe loss, friction, etc.) The determination that the coil car has received the coil is made based on the arm lift of the coil car.

Also, as a backup protection in case of abnormality,
The amount of movement until the coil car comes into contact with the coil is calculated, and if it rises more than necessary, it is stopped abnormally. This prevents the take-up reel from being damaged.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of an embodiment of the present invention. The same or corresponding parts as in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.

Reference numeral 10 denotes a process controller used in the present invention. The process controller 10 calculates the weight from the coil diameter and sets the pressure as described in detail in FIG. 1
1 is a pressure adjusting amplifier inputs the detected pressure PV of the pressure detector 12 for detecting the pressure to lift the pressure setpoint P _S and coil car 5 set in the process controller 10 controls the relief valve 13. Reference numeral 15 denotes a hydraulic pump.

FIG. 2 is a diagram showing the internal configuration of the process controller 10, in which a pressure set value calculation unit 10a and a pressure determination unit 10b
Arm position determining unit 10c, pressure determining unit 10b, and arm position determining unit 1 for determining the arm position of the coil car.
An AND circuit 10d for outputting an output signal when both signals from 0c are input simultaneously.

The pressure set value calculating section 10a calculates the pressure set value P
The _S, set by calculating the equation _{P S = K × (WK +} WC + α) kg / cm 2. However, K = pressure gradient (weight and required hydraulic characteristics) WC = coil cross-sectional area x width x specific gravity (7.85) x space factor (0.99) α = bias (correction of pipe loss, friction, etc.) Pressure judgment parts 10b, the pressure setpoint P _S × 0.8 (coefficient) <calculates the detected pressure.

The arm position determining unit 10c samples the amount of rise of the coil car (arm) at regular time intervals,
For example, the amount of movement every 100 ms is detected by the detector 5c,
Output is performed when the value of the previous value / current value is 0.5 or less twice or more.

When both outputs of the arm position determining unit 10c and the pressure determining unit 10b are input, the AND circuit 10d
After confirming that the coil has been lifted, an output is output to a coil car movement control unit (not shown), the diameter of the winding reel 3 is reduced, the coil is pulled out from the winding reel 3 by the coil car 5, and the next step is performed.

The judgment of the pressure judging section 10b determines that the coil is supported with a pressure (0.8) slightly lower than the hydraulic pressure required for lifting the coil, and that the arm of the coil car receives the coil by judging the coil. When this occurs, the movement amount is lost, so that this movement amount is １ ／ of the previous movement amount.
The reception is determined by detecting the following. For more accuracy, use pressure characteristics.
Check the number of times and determine the support of the coil. Then, when both the condition of the determination result and the condition of the pressure set value × 0.8 are satisfied, the lifting of the coil is confirmed, and the diameter of the take-up reel is reduced. Accordingly, the take-up reel is reduced in diameter concentrically with the coil.

In FIG. 2, reference numeral 10e denotes a backup protection unit which calculates a movement amount L ₁ until the arm of the coil car contacts the coil, sets an abnormality determination value X _mm, and sets a target coil lifting position (amount) L ₂ . When the condition of L ₂ + X _mm <L ₁ is satisfied, it is determined that an abnormal rise has occurred, an output is issued, the movement of the coil car is abnormally stopped, and the take-up reel is prevented from being damaged.

[0026]

As described above, according to the present invention, the pressure is set for each coil in consideration of the weight of the coil, and the amount of rise of the coil car arm is controlled. Up to the same system can achieve accuracy.

Further, since the hydraulic pressure is set to be proportional to the weight of the coil, damage due to lifting of the take-up reel, for example, even if the coil diameter is slightly different, is not damaged because the pressure applied to the take-up reel is small.

Further, when the coil is received, the gap between the take-up reel and the coil is equal (concentric) in the upper part and the lower part, so that even if the gap is slightly narrow, the coil can be easily removed. .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a process controller used in the present invention.

FIG. 3 is an explanatory view of a conventional coil extraction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Reduction gear 3 ... Take-up reel 4 ... Coil 5 ... Coil car 10 ... Process controller 10a ... Pressure setting value calculation part 10b ... Pressure judgment part 10c ... Arm position judgment part 10d ... AND circuit 10e ... Backup protection part

Claims (3)

[Claims] 1. A coil in which a steel strip is set on a take-up reel, the coil is supported by a coil car, the diameter of the take-up reel is reduced, then the coil is removed from the take-up reel and moved to the next step. In the extraction control method, the hydraulic pressure of the coil car required to support the coil is obtained by calculating the weight of the coil, and the hydraulic pressure of the coil car is controlled to this pressure set value as a pressure set value. It is characterized in that the confirmation of the support of the coil is determined by calculating the amount of rise of the coil car, after this confirmation, the diameter of the take-up reel is reduced, the coil is removed from the take-up reel, and the next process is performed. Coil removal control method. Wherein operation of said pressure setpoint P _S is the slope of the pressure K, coil car arm own weight WK, coil weight WC,
2. The coil removal control method according to claim 1, wherein when the bias is α, the bias is obtained by calculating P _S = K (WK + WC + α). 3. A method of calculating a moving amount of the coil car until the coil car touches the coil, and calculating a moving amount of the coil car larger than a value obtained by adding the calculated moving amount and a predetermined abnormality determination value. 3. The coil removal control method according to claim 1, wherein the coil car rise is abnormally stopped to provide backup protection.