JP2515580B2 - Spiral looper winding control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spiral looper winding shape control device, and more particularly to a device applied to a small spiral looper in a continuous welded pipe manufacturing line.

[Prior Art] FIG. 4 is an explanatory diagram showing the function of a spiral looper.
FIG. 5 is a block diagram showing the outline of a conventional winding shape control device for a spiral looper. In the figure, (1) is a strip (hereinafter referred to as "strip"), (2) is an input side pinch roller, (3) is an input side coil, (4) is an input side support roller, and (5) is a tower pinch. Roller, (5a) is a motor for rotationally driving the tower pinch roller (5), (6) is an output coil, (7) is an output support roller, (8) is an output pinch roller, and (9) is a drum shaft. , (10) are detectors for detecting the winding shape of the input side coil (3) and the output side coil (6), that is, whether the diameter is expanded or reduced, and extend from the input side coil (3) to the output side coil (6). The S-shaped strip (1) is arranged near the entrance coil (3) and near the exit coil (6).

The conventional spiral looper winding shape control device is configured as described above. For example, the strip (1) enters the spiral looper via the entry side pinch roller (2), and is wound on the entry side support roller (4). The entrance coil (3) is formed. Then, it passes through the inside of the inlet coil (3), passes over the tower pinch roller (5), and is wound on the outlet support roller (7) to form the outlet coil (6). From the outside of the output side coil (6), the strip (1) passes through the output side pinch roller (8) and goes out of the spiral looper. In this way, the strip (1) is accumulated in a coil shape on the input and output sides, and the drum shaft (9) including the input and output side support rollers (4) and (7) is directed in the direction of the arrow. Rotating in the direction of increases the accumulated amount, and rotating in the direction opposite to the direction of the arrow decreases the accumulated amount.

To explain the accumulation function of this strip,
Strips stored inside the looper at time t (1)
The length ΔL of can be expressed by the following equation.

ΔL = (V _E −V _D ) Δt (1) In the above equation, the looper entry speed V _E is the looper exit speed V _D
If it is smaller, ΔL becomes negative, and in this case, payout is made. Since the strip length ΔL is stored inside the looper, the drum shaft (9) has an angular velocity ω expressed by the following equation.
Rotate at _s .

R _E1 : Outermost outer diameter of incoming coil R _E2 : Innermost inner diameter of incoming coil R _D1 : Outermost outer diameter of outgoing coil R _D2 : Outermost inner diameter of outgoing coil From the above equation, R _E1 ≈ R _{E2 ′} R _D1 ≈ R _D2 That is, when V _E > V _D , the strip is accumulated inside the looper, but in this case, ω _s > 0, and the drum shaft (9) rotates forward.

When V _E <V _D , the strip (1) is discharged from the looper, but in this case, ω _s <0, and the drum shaft (9) rotates in the opposite direction. In other words, the increase / decrease of the loop amount is approximately adjusted by the forward / reverse rotation of the drum shaft (9).

By the way, the strip (1) that has entered the spiral looper through the entrance side pinch roller (2) forms the entrance side coil (3), and after passing over the tower pinch roller (5), forms the exit side coil (6). Then, in the process of passing through the output side pinch roller (8) and then out to the outside of the spiral looper, the input side coil (3) and the output side coil (6).
The winding shape of each is detected by the detector (10). Then, for example, if the detector (10) provided near the inlet side coil (3) detects that the winding shape of the inlet side coil (3) is in a diameter expanded state, the detector (10) is closer to the outlet side coil (6). The detector (10) provided detects that the winding shape of the output side coil (6) is in a reduced diameter state. Therefore, based on the detection signals of these detectors (10), the rotating speed of the drum shaft (9) is delayed and the rotating speed of the tower pinch roller (5) is adjusted to be high, so that the inlet coil (3) is And controlling the winding shape of the output coil (6).

[Problems to be Solved by the Invention] In the conventional winding shape control device for the spiral looper as described above, the detectors (10) for detecting the winding shapes of the input side coil (3) and the output side coil (6) are respectively provided. The S-shaped strip extending from the inlet coil (3) to the outlet coil (6) is arranged near the inlet coil (3) and the outlet coil (6), and the strip (1) is free. Since the position is in such a state, when the spiral looper has a small looper diameter or a small diameter coil with a small coil width, if the strip (1) is thick, the rigidity of the plate is strong and the curvature is large. Since it cannot be set large, the detection value of the detector (10) will be different from the actual winding shape of the input side coil (3) or the output side coil (6) due to bending of the waist, etc. There was a problem that control was performed

When the strip (1) is thin, the S-shaped strip (1) dances as a reaction when the looper is activated.
There is a problem that the control is in the hunting state.

The present invention has been made to solve the above problems, and enables stable control of the winding shape of a coil even when the spiral looper has a small looper diameter and a small coil width. The purpose is to obtain a spiral looper winding shape control device.

[Means for Solving the Problem] A spiral looper winding shape control device according to the present invention includes an upper table and a lower table for winding a moving strip to form an input side coil and an output side coil, respectively. A tower pinch roller that draws a strip from the side coil to the output coil, and a plurality of support rollers that are annularly arranged on the inner peripheral side of the wound strips that form the input and output coils, respectively. A rotating tower frame equipped with these support rollers in two upper and lower stages, a drive device that applies a rotational force to the rotating tower frame, and a pressing force that urges each support roller in the radial direction of the coil so as to press the strip forming the coil. The device and a detector provided on at least one of the upper and lower support rollers for detecting expansion and contraction of the coil, and these detectors. It is equipped with a speed control device that controls the rotation of the rotating tower frame and the feed of the tower pinch roller according to the output detection signal, and the support roller that receives the strip sent from the tower pinch roller is tapered. is there.

[Operation] In the present invention, the plurality of support rollers are annularly arranged in the upper and lower two stages on the inner peripheral side of the wound strip forming the input side coil and the output side coil. The spiral looper has a small looper diameter and can be handled with a small coil width because it is pressed against the strip forming the coil by the device and a detector for detecting the expansion and contraction of the coil is provided on at least one of the upper and lower support rollers. Even if the strip thickness is large, it can be detected at a large curvature, so it does not detect hip breaks, etc. Even if the strip thickness is thin, and even if the strip thickness is thin, the support roller Force the coil in the radial direction to press it against the strip forming the coil by a pressing device. Without causing slack, without detecting slack,
The detector can directly detect the actual winding shape of the coil, and stable control can be performed.

Furthermore, since the support roller that receives the strip sent from the tower pinch roller is tapered,
It is possible to prevent the strip from rising due to an increase in the amount of the strip fed to the support roller.

[Embodiment] FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a table provided with a support roller.
FIG. 3 is a block diagram showing a winding shape control device for a spiral looper.

1 and 2, the same configurations as those of the conventional example are denoted by the same reference numerals as those of the conventional example, and redundant description will be omitted. (1
2) is a cylindrical casing, (13) is a casing (12)
In the upper stage, a plurality of fixed rollers arranged annularly on the inner peripheral surface side, and (14) in the lower stage of the casing (12) are a plurality of fixed rollers arranged annularly on the inner peripheral surface side. An upper table is formed by winding the strip (1) around the entrance side pinch roller (2), the upper part of the casing (12) and the fixed roller (13) to form the entrance side coil (3). A lower table is formed by winding the strip (1) around the output side pinch roller (8), the lower part of the casing (12) and the fixed roller (14) to form the output side coil (6). (1
(5) is a rotating tower frame provided with inlet and outlet side support rollers (4), (7), (16) is a motor which is a drive device for applying a rotational force to the rotating tower frame (15), (1
Reference numeral 7) is an air cylinder (18a) which is a pressing device for urging the support rollers (4) and (7) in the radial direction of the coil so as to press the strip (1) forming the coil.
Is a potentiometer as a detector, and a plurality of support rollers (4) arranged annularly on the inner peripheral surface side of the wound strip (1) forming the entrance coil (3)
It is provided on the support roller (4) at a position that is most affected by the expansion / contraction change of the coil. (18b) is a potentiometer which is a detector, among the plurality of support rollers (7) annularly arranged on the inner peripheral surface side of the wound strip (1) forming the output side coil (6). , Provided on the support roller (7) at the position that receives the largest change in expansion and contraction of the coil. The support roller (7) for receiving the strip (1) sent from the tower pinch roller (5) is formed in a tapered shape whose diameter gradually increases as it goes upward.

In FIG. 3, (20) is the looper entrance speed V _E and the looper exit speed depending on the looper diameter from the rotation speed of the entrance side pinch roller (2) and the rotation speed of the exit side pinch roller (8).
A divider that sets V _D to a constant ratio, (21) is a rotating tower frame (1
5) A calculator for calculating the turning speed, (22) is a calculator (2
A frame rotation speed control device for controlling the rotation speed of a motor (16) that rotationally drives a rotation tower frame (15) based on the calculated value of 1), and (23) is the rotation speed of the input side pinch roller (2) and the output side. A divider that sets the rotational speed of the pinch roller (8) so that the looper inlet side speed V _E and the looper outlet side speed V _D according to the looper diameter have a constant ratio, and (24) is a divider (23 ) Output signal of the tower pinch roller (5) to calculate the rotation speed, (25) is the rotation speed of the motor (5a) that drives the pinch roller (5) to rotate based on the calculation value of the calculation unit (21) It is a pinch roller rotation speed control device for controlling. S ₁ is a detector provided on the support roller (4) that presses the input side coil (3), and S ₂ is the output side coil (6)
Detector provided on the support roller (7) that presses against
M ₁ is a motor (16) for rotationally driving the rotary tower frame (15), and M ₂ is a motor for rotationally driving the tower pinch roller (5).

 Next, the operation of the above embodiment will be described.

The wound strip (1) forming the inlet coil (3) and the wound strip (1) forming the outlet coil (6) are supported by an air cylinder (17). The rollers (4) and (7) are always pressed against the strip expanding direction. At this time, the expansion / contraction state of these coils (3), (6) and the support rollers (4),
(7) is wound at a balanced position, and the potentiometers (18a), (18b) whose zero point is the intermediate point of the cylinder stroke are operated following the support rollers (4), (7).

By the way, when the spiral looper has a small looper diameter and a small coil width, the potentiometers (18a) and (18b) can be expanded and contracted even if the strip (1) is thick. Is provided on the support rollers (4) and (7) that press-contact the strip (1) at a position where the curvature that directly occurs is large. No longer detect scaling. Further, even if the strip (1) is thin, the strip (1) is supported by the support rollers (4), (7).
Since there is no slack in the strip (1) because it is pressed by, the expansion / contraction of the coil caused by the slack is no longer detected. Therefore, the potentiometers (18a) and (18b) can directly detect the actual winding shape of the coil, and stable control can be performed based on the detection signals of the potentiometers (18a) and (18b).

Next, the coil winding form control based on the detection signal of the potentiometer will be specifically described with reference to FIG.

From the rotational speed of the input side pinch roller (2) and the rotational speed of the output side pinch roller (8), a divider (20) is used to determine the looper input side speed V _E and the looper output side speed V _D according to the looper diameter.
Is set to be a constant ratio, and the rotating tower frame (15) is calculated from the output signal of the divider (20) in the calculator (21).
Calculates the turning speed of. Frame turning speed controller (2
In 2), based on the calculated value, the rotating tower frame (1
It controls the rotation speed of the motor (16) that drives 5) to rotate.

In addition, a divider (23) is used to calculate the looper entrance speed V _E and the looper exit speed V _D according to the looper diameter from the rotation speeds of the entrance pinch roller (2) and the exit pinch roller (8). Is set to be a constant ratio, and the calculator (2
In 4), the rotation speed of the tower pinch roller (5) is calculated from the output signal of the calculator (23). The pinch roller rotation speed control device (25) controls the rotation speed of the motor (5a) that drives the pinch roller (5) based on the calculated value.

By forming the input side coil (3) and the output side coil (6) by both of these control devices (22) and (25), accumulation is carried out and the looper input side speed V _E of the strip (1) and the looper are set. The exit speed V is kept at a constant ratio. However, during the actual operation of the spiral looper, due to the speed fluctuations of the entrance side pinch roller (2) or the exit side pinch roller (8) and other causes, the inside of the entrance side coil (3) or the exit side coil (6) The looper diameter may fluctuate. Therefore, this is the potentiometer (18a), (18
It is necessary to detect it in b) and correct and control it for a normal winding shape.

For example, when the inlet coil (3) is in the expanded state, the outlet coil (6) is in the contracted state, which are provided on the inlet coil (3) side and the outlet coil (6) side, respectively. The potentiometers (18a) and (18b) detect the correction amounts, and the computing units (21) and (24) calculate the correction amount based on the detected values. That is, when the inlet coil (3) is expanded and the outlet coil (6) is contracted, the rotating tower frame (15)
The frame rotation speed control device (22) controls the rotation speed of the tower and the pinch roller rotation speed control device (25) to increase the rotation speed of the tower pinch roller (5). Return to coiled form.
On the contrary, when the inlet coil (3) has a reduced diameter, the inlet coil (6)
When the diameter is increased, the rotation number of the rotating tower frame (15) is increased and the rotation number of the tower pinch roller (5) is decreased, so that the coil winding shape is returned to the normal state. By the way, when the output side coil (6) is expanded in diameter, or when the number of rotations of the tower pinch roller (5) is increased by correction control, or when the strip (1) is thin, the tower pinch roller (5). At the location of the output side support roller (7) that receives the strip (1) sent from the above, since the amount of feed of the strip (1) is large and there is no other escape place, the auction rises, but the support roller (7) ) Has a taper shape in which the diameter gradually increases in the upward direction, which is the feeding direction, so that the serration of the strip (1) is prevented.

In this embodiment, the potentiometers (18a) and (18b) are provided on each of the input side and output side support rollers (4) and (7), but a plurality of support rollers (4), Potentiometer (18a), (18
Of course, b) may be provided and the winding shape control may be performed based on the average value of these detection values.

[Effects of the Invention] As described above, according to the present invention, a plurality of support rollers are annularly arranged in upper and lower two stages on the inner peripheral side of the wound strip forming the input side coil and the output side coil. The support roller is pressed against the strip forming the coil by a pressing device, and at least one support roller in each of the upper and lower stages is provided with a detector for detecting expansion / contraction of the coil, so that the spiral looper has a small looper diameter. Since the coil width is small and the slip plate thickness is large, it can be detected in a place with a large curvature, so waist breaks etc. are not detected, and the strip plate thickness is thin. However, since the support roller is pressed against the strip forming the coil by the pressing device, it does not cause slack in the coil. There is an effect that the detector can directly detect the actual coil winding shape without detecting a sag and the like, and stable control can be performed based on the detection value of the detector.

In addition, since the support roller that receives the strip sent from the tower pinch roller is tapered, it is possible to prevent the rise of the serration caused by the increase in the strip feed amount to the support roller.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing a table provided with a support roller, FIG. 3 is a block diagram showing a spiral looper winding shape control device, FIG. 4 is an explanatory view showing the function of the spiral looper, and FIG. 5 is a conventional spiral looper. It is a block diagram which shows the outline of the winding shape control device. 1: Strip (belt), 2: Input side pinch roller, 3: Input side coil, 4: Input side support roller, 5: Tower pinch roller, 6: Output side coil, 7: Output side support roller, 8: Output side Side pinch rollers, 18a, 18b: Potentiometer (detector).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Todo Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Atsushi Watanabe 1-2-1 Marunouchi Chiyoda-ku, Tokyo Nippon Steel Pipe Incorporated (72) Inventor Akira Iwatani 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Within Nippon Steel Tube Co., Ltd.

Claims (1)

(57) [Claims] 1. An upper table and a lower table for winding a moving strip to form an input side coil and an output side coil, respectively, and a tower pinch roller for pulling out the strip from the input side coil to the output side coil. A plurality of support rollers arranged annularly on the inner peripheral side of the wound strip forming the inlet and outlet coils, and a rotary tower frame provided with these support rollers in two upper and lower stages, A drive device that applies a rotational force to the rotating tower frame, a pressing device that biases each support roller in the radial direction of the coil so as to press each support roller against the strip forming the coil, and at least one support roller in each of the upper and lower stages. A detector for detecting the expansion and contraction of the coil, and the rotation of the rotating tower frame and the feed of the tower pinch rollers according to the detection signals from these detectors. Gosuru a speed control device, Makisugata controller spiral looper, characterized in that the support rollers for receiving the strip fed from the tower pinch roller and tapered.