JPH0339948B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a drum-rotary winding machine for winding a wire rod from a finishing mill of a wire rod rolling mill into a coil.
The present invention relates to a method for controlling the position of the wire tip with respect to the bottom plate of the winder at the time of starting winding.

[Prior art] As a prior art related to the present invention,
Publication No. 42736 discloses a wire rod coil manufacturing method in which a wire rod from a finishing mill of a wire rod rolling mill is wound into a ring shape from a laying head, and then placed continuously in a ring shape on a belt conveyor and converged at the end of the belt conveyor. In the apparatus, a method is disclosed for controlling the amount of rotation of the laying head and determining the position of the discharge port so that the tip of the wire is placed at a target fixed position on a belt conveyor when discharged from the laying head.

However, in the wire rod coil manufacturing apparatus to which the present invention is directed, as shown in FIG. Since this is a coil device and the method is to control the position of the wire tip relative to the bottom plate of a rotating winder, the above-mentioned position control technique on a belt conveyor cannot be applied.

[Problem that the invention seeks to solve]

In conventional drum type winders, the following troubles may occur in the fork of the wire coil moving device depending on the position of the wire end with respect to the bottom plate of the winder at the start of winding. This will be explained with reference to FIGS. 6a and 6b.

Fig. 6a is a side view showing a state in which a wire rod coil wound by a winding machine is transferred by a transfer device, and Fig. 6b is a side view showing a state in which a fork of the transfer device enters when lifting a wire rod coil. do. FIG. 7 is a plan view showing fork grooves in the bottom plate of the material to be taken up.

First, when winding of the wire coil 1 is completed, the transfer device 2 moves forward with respect to the winder bottom plate 4, and the fork 3 of the transfer device enters the fork groove 5 of the winder bottom plate 4. Then, the transfer device 2 ascends as it is, receives the wire rod coil 1 from the winder, and then moves forward or backward as it is to receive the wire rod coil 1.
Transfer to another location. Therefore, if the tip of the wire gets into the fork groove 5 of the bottom plate 4 of the winder when winding is finished, problems such as the wire coil 1 falling over occur, and the mill has to be stopped.

For this reason, it is necessary to control the rotation angle of the winder so that the tip of the wire does not enter the fork groove 5 of the winder bottom plate 4 at the time the winder starts winding. However, since the behavior of the tip of the wire rod falling to the bottom plate 4 of the winding machine is complex and does not show a uniform tendency, it is very difficult to properly control the position of the tip of the wire rod with respect to the bottom plate 4.

An object of the present invention is to enable position control with respect to the winder bottom plate when the wire tip falls onto the winder bottom plate.

[Means for solving problems]

In view of the above problems, the present inventor has made the following:
The falling behavior of the tip of the wire onto the winder bottom plate 4 was geometrically analyzed. First, the falling behavior of the tip of the wire will be explained.

FIG. 1 shows the behavior of the wire tip falling onto the bottom plate 4 of the winding machine.

In Fig. 1, from the driving pipe 6, the driving pipe angle θ ₀
The wire rod 1 that has entered the winding machine contacts the winding machine outer wall 8 at point A. The rotational speed of the winder is set so that the circumferential speed at the winding average diameter D matches the wire rod speed V ₀ , so that thereafter the circumferential speed of the outer wall 8 of the winder is lower than the wire rod speed V ₀ . Because of the speed, the tip of the wire is dragged by the outer wall 8 of the winding machine and falls.

The winding average diameter D, the vertical velocity v ₁ when the tip of the wire is dragged by the outer wall 8 of the winder and falling, and the velocity when the tip of the wire is dragged by the outer wall 8 of the winder and falls. Horizontal velocity v ₂ of hanging and falling angle θ ₁
is determined by the following formula, where Do is the maximum winding diameter and Dn is the minimum winding diameter.

D=(Do+Dn)/2 v ₁ = vocosθo v ₂ = (Do/D)×vo θ ₁ = tan ^-1 (v ₂ /v ₁ ) Also, the distance that the tip of the wire slips on the outer wall 8 of the winding machine ( S ₂ −S ₁ ) is determined by the following formula.

(S ₂ − S ₁ )=Lo(tanθ ₁ −tanθo) …(1) Here, S ₁ : Progress of the winding average diameter from when the wire tip contacts the winding machine outer wall 8 until it falls. Distance, S ₂ : Distance that the maximum diameter of the winding amount advances from when the tip of the wire comes into contact with the outer wall 8 of the winder until it falls. Lo: Height at which the tip of the wire comes into contact with the outer wall 8 of the winder.

It has been found that such slips are the cause of varying the position of the wire tip with respect to the bottom plate.

Based on this knowledge, the present invention corrects the preset rotation angle of the winding machine at the time of starting winding according to the amount of slippage of the wire tip on the side of the winding machine,
Adjust the rotation angle of the winder so that the tip of the wire at the bottom plate of the winder is in a fixed position. Next, this will be explained in detail.

From the above equation (1), the rotation angle γ of the winder at which the tip of the wire slips on the outer wall 8 of the winder is determined by the following equation.

γ=[(S ₂ - S ₁ )/(πDo)]×360 (°)...(2) Here, the preset winding value at the time when the tip of the wire comes into contact with the outer wall 8 of the winding machine in FIG. The concept of machine rotation angle α ₁ will be explained.

The preset winding machine rotation angle α ₁ at the time when the wire rod tip contacts the winding machine outer wall 8 is based on the rotation angle α at which the wire rod tip contacts the winding machine outer wall 8.
The rotation angle γ at which the wire tip slips on the outer wall 8 of the winding machine is corrected and determined.

α ₁ = α − γ In reality, at the preset winder rotation angle α ₁ at the time when the wire tip contacts the winder outer wall 8, the wire tip falls to the reference position of the winder. Therefore, the rotation angle from the reference position of the winding machine at which the tip of the wire rod should fall is further corrected.

〔Example〕

An embodiment of the invention is shown in FIG. In this, the pulse of the pulse transmitter 13 that detects the position of the tip of the wire installed on the reference roll 11, the pulse of the winding machine 12
Pulse transmitter 1 for detecting the rotation angle of the winding machine installed in
5, the pulse of the reference position detector 18, and the signal of the wire detector 14 are processed by the arithmetic processing unit 19.
give to

The arithmetic processing unit 19 calculates the number of pulses transmitted by the pulse transmitter 13 from the time when the wire rod tip is detected by the wire rod detector 14 ₁ on the pulse transmitter 13 side until the wire rod detector 14 ₂ on the winding machine side detects the wire rod tip. and the time, and from the distance between the two wire detectors 14 ₁ and 14 ₂ and the pulse count value, find the distance the wire moves per pulse of the pulse transmitted by the pulse transmitter 13 that detects the position of the tip of the wire. , and wire detector 14 ₁ ,
The moving speed of the wire is determined from the distance between 14 _{and 2} and the time count value, and after the tip of the wire passes through the wire detector ₁₄ on the winding machine side, the pulse transmitter 1
Count the number of emitted pulses in step 3 and calculate the count value ×
(wire movement distance per pulse), the tip of the wire is
Calculate the distance from the wire detector 13 ₂ . That is, the momentary current position of the tip of the wire is calculated. The arithmetic processing unit 19 also performs a process from when the wire detector 14 transmits one pulse to when the wire detector 14 transmits the next pulse.
That is, during one rotation of the winder, the pulse generator 15
The number of transmitted pulses and the time are counted, and from this pulse number count value, the rotation angle per one pulse of the transmitted pulse of the transmitter 15 is calculated, and the rotation speed is calculated from the time count value (time for one rotation of the winding machine). After that, every time the reference position detector 14 transmits one pulse, the transmitter 15 starts counting the pulses, and calculates the current rotation angle by multiplying the count value by the rotation angle per pulse. That is, the momentary current rotation angle of the winder 12 is calculated.

The arithmetic processing unit 19 further calculates the remaining distance from the current position of the wire rod tip until the wire rod tip contacts the winding machine outer wall 8, and from this remaining distance and the wire rod speed, the wire rod tip From this time, the current rotation angle, and the rotation speed, calculate the rotation angle β of the material to be wound when the tip of the wire comes into contact with the winder outer wall 8. Perform predictive calculations. Then, the rotation angle β predicted and calculated in this way is applied to the preset winding machine 1.
2 is compared with the rotation angle α ₁ of 2, and compared with α ₁ , the difference (correction amount) ΔA of β with respect to α ₁ is calculated.

ΔA=α ₁ −β Calculate the speed (speed correction amount) required to rotate the winder by the angle of ΔA in the time until the contact, correct the speed of the winder by this amount, and calculate the time After , the speed of the winder can be returned to the original speed. However, there are other practical methods as well.

In this embodiment, the speed of the winder 12 is adjusted as follows. This correction control method is shown in FIG. When a correction signal ΔRef is added for a short time t to the speed command Ref of the electric motor 16 rotating at a constant speed in proportion to the wire speed, the rotational speed N of the electric motor 16 increases.
changes triangularly by ΔN. Correction signal ΔRef
FIG. 5 shows an example of a correlation diagram between the amount of change ΔA in the rotation angle of the winder 12 and the amount of change ΔA in the rotation angle of the winding machine 12 when the magnitude of the application time t is changed while keeping the magnitude of ΔA constant. Moreover, the phase opening formula is expressed by the following formula.

t=√...(3) K: constant determined from measured data In this embodiment, ΔA is corrected based on this equation (3). That is, the arithmetic processing unit 19 calculates t using equation (3), and adds a correction signal ΔRef whose magnitude is constant during this t to the speed command Ref of the electric motor 16.

As described above, the arithmetic processing unit 19 sends a correction signal ΔRef to the motor control device 17 so that the rotation angle β of the winder 12 at the time of contact with the winder outer wall 8 becomes the preset rotation angle α ₁ . is output, and the rotation angle of the winder 12 at the time when the wire tip contacts the winder outer wall 8 is controlled.

By repeating the above control several times before the wire tip passes through the detector 14 ₂ and before it reaches the winder 12, the wire is wound up at the point when the wire tip contacts the winder outer wall 8. The accuracy of rotation angle control in which the rotation angle of the machine 12 is set to the set value α ₁ is further improved.

〔Effect of the invention〕

According to the present invention, the tip of the wire rod no longer enters the fork groove 5 of the bottom plate 4 of the winder shown in Fig. 6, which enables stable wire coil transfer and prevents rolling failures due to falling wire coils, etc. The problem is gone.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram for explaining the behavior of the tip of the wire. In the figure, the upper left block shows the side of the winding machine, the lower left block shows the plane of the winding machine, and the upper right block shows the side view of the winding machine. indicates the position where the tip of the wire reaches the bottom of the winder. FIG. 2 is a plan view showing the outer wall of the winding machine. FIG. 3 is a block diagram showing the configuration of an apparatus for carrying out one embodiment of the present invention. FIG. 4 is a time chart showing the speed fluctuation characteristics of the electric motor 16 shown in FIG. Figure 5 shows the correction time of the speed command that determines the speed of the electric motor 16 and the corresponding winding machine 1.
2 is a graph showing the relationship between rotation angle change amount and rotation angle change amount. FIG. 6a is a side view of a wire rod coil wound by a conventional winding machine, and FIG. 6b is a bottom view showing an enlarged part of the bottom plate of the winding machine. 1...Wire, wire coil, 2...Transfer device, 3
... Fork of the transfer device, 4 ... Bottom plate of the winder, 5
... Fork groove, 6 ... Driving tube, 7 ... Winder internal pin, 8 ... Winder outer wall, 9 ... Winder upper surface, 1
0...Bottom surface of the winder, 11...Reference roll, 12...
... Winding machine, 13 ... Pulse transmitter for wire position detection, 14 ... Wire rod detector, 15 ... Pulse transmitter for winding machine angle detection, 16 ... Electric motor, 17 ... Motor control device, 18 ... ...Reference position detector, 19...
...Arithmetic processing unit.

Claims (1)

[Claims] 1. When winding a wire rod with a drum-type winder, the current value of the wire rod tip position before the start of winding and the current value of the rotation angle of the winder are determined by a detector and a calculation device, respectively, and the current value of the wire rod is determined by a detector and a calculation device. The rotation angle of the winder at the time of starting winding is predicted according to the tip position and the distance to the winder, and the amount of deviation from the preset winder rotation angle at the time of starting winding is calculated. In the method of adjusting and controlling the rotation angle of the winder according to A control method for a wire rod winding machine, characterized in that the rotation angle of the winding machine is adjusted so that the tip of the wire rod on the bottom plate of the winding machine is at a constant position.