JPH0220617A - Winding shape control device for spiral looper - Google Patents

Abstract

PURPOSE:To detect the actual coil winding shape and to perform a stable control by disposing plural support rollers on the inner periphery of a strip forming the coil on the inlet and outlet sides and providing a detector to detect the expanding and contructing of the coil on at least one of those. CONSTITUTION:The strip 1 forming the inlet side coil 3 and the strip 1 forming the outlet side coil 6 are press-contacted in the strip expanding direction by the support rollers 4, 7 thrusted by an air cylinder. At this case, potentio-meters 18a, 18b are operated following the support rollers 4, 7. Therefore, even the thickness of the strip is thick, because the detecting is performed at the part having large curvatures, the buckling, etc., are not detected. Further, even the strip having thin plate thickness, because the support rollers are press-contacted with the strip, any sag is generated on the coil, the coil winding shape is detected directly by the detector to enable controlling the stable control. Furthermore, the support rollers are made tapered shape to prevent pushing up the strip.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spiral louver winding control device, particularly to one applied to a small spiral looper in a continuous welded pipe production line.

[Prior Art] FIG. 4 is an explanatory diagram showing the functions of a spiral looper, and FIG. 5 is a configuration diagram showing an outline of a conventional spiral louver winding control device. In the figure, (1) is a strip (hereinafter referred to as "strip"), (2) is an input pinch roller, (3) is an input coil, 4) is an input support roller, and (5) is a tower pinch. rollers, (5a) is the motor that rotationally drives the tower pinch roller (5), (6) is the outlet coil, (7) is the outlet support roller, (8) is the outlet pinch roller, (9) is the drum shaft , (10) is the input coil (
3) and the winding state of the exit coil (6), that is, whether the diameter is expanded or contracted.
The S-shaped strip (1) is arranged near the inlet coil (3) and towards the outlet coil (6), respectively.

A conventional spiral louver winding control device is configured as described above. For example, the strip (1) enters the spiral louver via the entry side pinch roller (2), is wound onto the entry side support roller (4), An inlet coil (3) is formed. Next, it passes inside the inlet coil (3), passes over the tower pinch roller (5>), and then passes over the outlet support roller (7).
) to form the exit coil (6). From the outside of the exit coil (6), the strip (1) passes through the exit pinch roller (8) and exits to the outside of the spiral louver. Thus, the strip (1) will be accumulated in a coil on the exit side, and the drum shaft (9) containing the entry and exit support rollers (4), (7) will move in the direction of the arrow. If it rotates in the direction of the arrow, the amount of storage increases, and if it rotates in the opposite direction to the direction of the arrow, the amount of storage decreases.

To explain the storage function of this strip, the length ΔL of the strip (1) stored inside the louver in the time Δ can be expressed by the following equation.

ΔL−(VE−VD)Δt (1) In the above equation, if the louver entrance speed Vp is smaller than the louver exit speed VD, ΔL becomes negative, and in this case, it is paid out. In order to store this strip length ΔL inside the looper, the drum shaft (9) has an angular velocity ω8 expressed by the following formula.
Rotate with.

...(2) R: Outermost outer diameter of the inlet coil R: Innermost inner diameter of the inlet coil R: Outermost outer diameter of the outlet coil Old R: Innermost outer diameter of the outlet coil Looking at the side inner diameter approximately, in the above formula, REl'RE2'RD1' =
As iRD2, ω shout□ (V − VD) RE2+RD2 (3) That is, when VE>VD, the strip is accumulated inside the looper, but in this case, ω>0, and the drum shaft (9) rotates in the normal direction.

Further, when V is less than VD, the strip (1) is ejected from the louver, but in this case, ω is made to be zero, and the drum shaft (9) rotates in the opposite direction. In other words, the drum shaft (
9), the increase or decrease of the loop amount can be adjusted approximately.

By the way, the strip (1) that has entered the spiral louver via the input pinch roller (2) is connected to the input coil (3).
After passing over the tower pinch roller (5), an exit coil (6) is formed, and in the process of passing through the exit pinch roller (8) and exiting to the outside of the spiral louver, the input coil (6) is formed. The winding shapes of the side coil (3) and the output side coil (6) are detected by a detector (10), respectively. For example, a detector (10) provided near the inlet coil (3)
If it detects that the winding state of the inlet coil (3) is in an enlarged diameter state, the detector (1) installed near the outlet coil (6)
0) detects that the winding state of the output side coil (6) is in a diameter-reduced state. Therefore, based on the detection signals of these detectors (10), by adjusting the rotation speed of the drum shaft (9) to slow down and to increase the rotation speed of the tower pinch roller (5), the inlet coil (3) and exit coil (6)
It was controlling the appearance of the scroll.

[Problems to be Solved by the Invention] In the conventional spiral louver winding control device as described above, the detectors (10) for detecting the winding shapes of the inlet coil (3) and the outlet coil (6) each have a The S-shaped strip extending from the inlet coil (3) to the outlet coil (6) is arranged near the inlet coil (3) and towards the outlet coil (B), and the strip (1) is free. Since it is in a position where the spiral louver is in a state of
In the case of small-diameter equipment that handles a narrow coil width, if the thickness of the strip (1) is thick, the plate is stiff and cannot have a large curvature, which may cause the detector (10) to bend. There is a problem in that the detected value is different from the actual winding shape of the inlet coil (3) or the outlet coil (6), and control is performed using an incorrect detected value.

Further, when the thickness of the strip (1) is thin, there is a problem in that the figure 8 strip (1) dances due to the reaction when the looper is activated, resulting in a hunting state in the control.

This invention was made in order to solve this problem, and it is possible to stably control the winding shape of the coil even when the spiral looper is a small piece of equipment with a small louver diameter and a narrow space inside the coil to handle. The purpose of the present invention is to obtain a winding shape control device for a spiral looper that can perform the following functions.

Comb [Means for solving the problem] A winding shape control device for a spiral looper according to the present invention includes:
an upper table and a lower table for winding the moving strip to form inlet and outlet coils, respectively;
A tower pinch roller that pulls out a strip from the inlet coil to the outlet coil, and a plurality of support rollers arranged annularly on the inner periphery of the wound strip forming the inlet and outlet coils. , a rotating tower frame with support rollers arranged in upper and lower stages, a drive device that applies rotational force to the rotating tower frame, and a radial bias of the coil so as to press each support roller against the strip forming the coil. a suppressor for detecting expansion and contraction of the coil, which is provided on at least one support roller in each of the upper and lower stages; The support roller for receiving the strip sent out from the tower pinch roller is tapered.

[Function] In this invention, a plurality of support rollers are arranged in an annular manner in upper and lower stages on the inner circumferential side of the wound strip forming the inlet and outlet coils, and each support roller has a pressing force. The device presses the strip forming the coil, and at least one support roller in each of the upper and lower stages is equipped with a detector for detecting the expansion and contraction of the coil. The equipment is small and narrow, and even if the strip is thick, it can be detected at areas with large curvature, so bends etc. will not be detected.Also, even if the strip is thin, the support roller The coil is biased in the radial direction of the coil by a pressing device so that it comes into pressure contact with the strip forming the coil, so there is no slack in the coil, and the detector can detect the actual coil winding without detecting any slack. can be detected directly,
Stable control is possible.

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

[Embodiment] Fig. 1 is a block diagram showing an outline of an embodiment of the present invention.
The figure is a sectional view showing a table equipped with support rollers, and FIG. 3 is a block diagram showing a winding form control device for a spiral looper.

In FIGS. 1 and 2, the same components as in the conventional example are given the same reference numerals as in the conventional example, and redundant explanation will be omitted. (12
) is a cylindrical casing, (13) is a casing (12
) is the upper stage of the casing (12), and a plurality of fixed rollers are arranged in an annular manner on the inner peripheral surface thereof, and (14) is the lower stage of the casing (12), and is a plurality of fixed rollers arranged in an annular manner on the inner peripheral surface thereof. . An upper table is configured on which the strip (1) is wound around the input pinch roller (2), the upper part of the casing (12), and the fixed roller (13) to form the input coil (3). A lower table is configured on which the strip (1) is wound 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). (15) is the support roller (
4), (7) is a rotating tower frame, (16) is a motor which is a driving device that provides rotational force to the rotating tower frame (15), (17) is each support roller (4),
(7) is an air cylinder which is a suppression device that urges the coil in the radial direction so as to press it against the strip (1) forming the coil, (18a) is a potentiometer which is a detector, and (18a) is a potentiometer which is a detector; Among the plurality of support rollers (4) arranged in an annular manner on the inner circumferential surface side of the wound strip (1) forming the coil 3), the support roller (4) is located at a position that receives the greatest change in expansion and contraction of the coil. It is set in. (isb) is a potentiometer which is a detector,
Among the plurality of support rollers (7) arranged in an annular manner on the inner peripheral surface side of the wound strip (1) forming the exit coil (6), the support roller (7) is located at the position that is most affected by the change in expansion and contraction of the coil. It is provided on the support roller (7). The strip (1) fed out from the tower pinch roller (5)
) is formed into a tapered shape that gradually increases in diameter as it goes upward.

In Fig. 3, (20) shows that the louver entrance speed VE and looper exit speed VD are constant depending on the looper diameter from the rotational speed of the input side pinch roller (2) and the rotational speed of the exit side pinch roller (8). Divider, set to be the ratio (2
1) is an arithmetic unit that calculates the rotation speed of the rotating tower frame (15) based on the output signal of the divider (20);
15), a frame rotation speed control device that controls the rotation speed of the motor (16) that rotationally drives the frame rotation speed control device (23), which determines the looper diameter from the rotation speed of the input side pinch roller (2) and the rotation speed of the output side pinch roller (8). A divider (24) sets the louver inlet speed Vp and looper outlet speed VD at a constant ratio according to the output signal of the divider (23), which controls the rotation of the tower pinch roller (5). A calculator that calculates speed,
(25) is a pinch roller rotation speed control device that controls the rotation speed of a motor (5a) that rotationally drives the pinch roller (5) based on the calculated value of the calculator (21). Sl is a detector installed on the support roller (4) that presses the inlet coil (3), S2 is a detector installed on the support roller (7) that presses the output coil (6), and Ml is the rotating tower. A motor (16) that rotationally drives the frame (15) is shown, and M2 is a motor that rotationally drives the tower pinch roller (5).

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

The wound strip (1) forming the inlet coil (3) and the wound strip (1) forming the outlet coil (6) are supported by a compressed air cylinder (17). The rollers (4) and (7) constantly press the strip in the direction of expanding the strip. At this time, the expansion/contraction state of these coils (3) and (8) and the support roller (4)
, (7) are wound in a balanced position, and the potentiometer (18a) and (L8b) are the support roller (4), whose zero point is the midpoint of the cylinder stroke.

It operates in accordance with (7).

By the way, the spiral louver has a small looper diameter,
When using small equipment with a narrow coil width to handle, even if the strip (1) is thick, the potentiometers (18a) and (ill, b) have a large curvature that is directly caused by expansion and contraction of the coil. Because they are provided on the support rollers (4) and (7) that press the strip (1) at the position, expansion and contraction of the coil can be detected in areas with large curvature, and expansion and contraction of the coil caused by bending the waist etc. can no longer be detected. Ta. In addition, even if the strip (1) is thin, the strip (1) can be attached to the support roller (
4) Since they are pressed together by (7), there is no slack in the strip (1), so it is no longer possible to detect expansion and contraction of the coil caused by slack. Therefore, the potentiometers (18a) and (18b) can detect the actual winding form of the coil in tU contact.

Based on the detection signal (18b), stable control can be performed.

Next, coil winding control based on the detection signal of the potentiometer will be explained in detail with reference to FIG. 3.

Using the divider (20) from the rotational speed of the input pinch roller (2) and the rotational speed of the output pinch roller (8), the looper input speed VE and looper output speed VD are determined to be a constant ratio according to the looper diameter. The calculation unit (21
) calculates the rotation speed of the rotating tower frame (15) from the output signal of the divider (20).

The frame rotation speed control device (22) controls the rotation speed of the motor (16) that rotationally drives the rotating tower frame (15) based on the calculated value.

Also, from the rotation speed of the input pinch roller (2) and the rotation speed of the output pinch roller (8), a divider (23) is used to make the looper input side speed Vp and looper output side speed VD constant according to the louver diameter. The calculation unit (24) calculates the rotation speed of the tower pinch roller (5) from the output signal of the calculation unit (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 inlet coil (3) and the outlet coil (6) by these two control devices (22) and (25),
After performing the accumulation, the looper entrance speed V of the strip (1)
E and the looper exit speed V are kept at a constant ratio.

However, during actual operation of the spiral looper, due to speed fluctuations of the input side pinch roller (2) or the output side pinch roller (8), etc., or other causes, the inside of the input side coil (3) or the output side coil (6) may change. Louver diameter may vary. Therefore, use this as a potentiometer (18a).
, (18b), and it is necessary to perform correction control to maintain a normal winding configuration.

For example, when the inlet coil (3) is in an expanded diameter state, the outlet coil (6) is in a reduced diameter state, and this is connected to the inlet coil (3).
) side and the output coil (6) side, respectively, are detected by potentiometers (18a) and (18b),
Each computing unit (21), (2) calculates the correction amount based on the detected value.
4). That is, when the diameter of the inlet coil (3) is expanded and the diameter of the outlet coil (6) is decreased, the frame rotation speed control device (22) controls the rotation speed of the rotating tower frame (15) to retard it. At the same time, the pinch roller rotation speed control device (25) is controlled to increase the rotation speed of the tower pinch roller (5), thereby returning to the normal coil winding state. Conversely, when the inlet coil (3) is in a reduced diameter state and the inlet coil (6) is in an enlarged diameter state, the rotation speed of the rotating tower frame (15) is increased and the rotation of the tower pinch roller (5) is increased. By reducing the number, the coil winding will return to its normal state. By the way, if the diameter of the exit coil (6) is expanded, or if the tower pinch roller (
5) is increased by correction control, and when the strip (1) is thin, the output support roller (7) receives the strip (1) sent out from the tower pinch roller (5). As the amount of feed of the strip (1) increases and there is no other escape route, the warp occurs, but the support roller (7) has a tapered shape that gradually expands in diameter as it goes upward, which is the feed direction. Therefore, the strip (1) is prevented from curling up.

In addition, in this example, the support rollers (
4) and (7) are provided with potentiometers (18a) and (18b), but a plurality of support rollers (4) and (7) are provided with potentiometers (18a) and (18b), respectively.
8a).

It goes without saying that (18b) may be provided respectively, and the winding form control may be performed based on the average value of these detected values.

[Effects of the Invention] As explained above, in this invention, a plurality of support rollers are arranged annularly in two stages, upper and lower, on the inner peripheral side of the wound strip forming the inlet and outlet coils. The support roller is brought into pressure contact with 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 to detect expansion and contraction of the coil. (It is a small equipment with a narrow coil width to handle, and even if the slip plate is thick, it can be detected in areas with large curvature, so bending etc. will not be detected, and the strip plate is thin. Even if there is, the support roller is brought into pressure contact with the strip forming the coil by the pressure contact device, so there is no slack in the coil.
There is an effect that the detector can directly detect the actual coil winding form without detecting slack etc., and stable control can be performed based on the detected value of the detector.

In addition, the support roller that receives the strip sent out from the tower pinch roller is tapered, so
This has the effect of preventing warping caused by an increase in the amount of strip fed to the support roller.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an outline of an embodiment of the present invention, and FIG.
The figure is a sectional view showing a table equipped with support rollers, Figure 3 is a block diagram showing a spiral looper winding control device, Figure 4 is an explanatory diagram showing the functions of the spiral looper, and Figure 5 is a conventional spiral looper. It is a block diagram showing an outline of a winding form control device of. 1; Strip (band-shaped material), 2: Inlet side pinch roller, 3
: Inlet side coil, 4: Inlet side support roller, 5: Tower pinch roller, 6: Outlet side coil, 7: Outlet side support roller, 8: Outlet side J pinch roller, 18a, 18b: Vo tension meter (detector) .

Claims (1)

[Claims] An upper table and a lower table that wind the moving strip to form inlet and outlet coils, respectively, a tower pinch roller that pulls out the strip from the inlet coil to the outlet coil, and the inlet and outlet coils. A plurality of support rollers arranged in an annular manner on the inner circumferential side of the wound strip forming the coil, a rotating tower frame equipped with these support rollers in upper and lower stages, and a driving device for applying a force; a pressing device for urging each support roller in the radial direction of the coil so as to press it against the strip forming the coil; and a speed control device that controls the rotation of the rotating tower frame and the feeding of the tower pinch roller according to the detection signals of these detectors, and receives the strip sent out from the tower pinch roller. A spiral looper winding control device characterized by a tapered support roller.