JP3021196B2 - Strip accumulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator for storing pipes, rods, strips and the like (hereinafter referred to as "strips"), and more particularly, but not exclusively, to continuous accumulators. The present invention relates to an accumulator for storing a relatively large amount of strip material fed at a high speed while maintaining the feeding movement.

[0002]

2. Description of the Related Art In a strip processing line in which a series of processing is performed while continuously transferring a strip, the strip is processed for the purpose of preventing interference of strip tension or speed fluctuation between preceding and following processes, annealing, cooling, and the like. It is necessary to keep the same place in the substantially same atmosphere for a relatively long time while continuing the transfer. For example,
In the production of the flux-cored wire used for welding, the coiled steel sheet is rewound by an uncoiler and supplied to a tube forming machine PM as shown in FIG. When the rewinding of one coil is completed, the tip of the next coil is welded to the tail end of the strip, and a continuous strip is supplied to the tube forming machine PM. The tube forming machine PM forms the strip from a flat plate into a U-shaped cross section and into a round shape, fills the flux during the formation from the U shape into a round shape, and welds the round seam by high frequency induction welding. Then, a flux-cored pipe is manufactured by removing the outer bead by this welding with a cutter (for example, see JP-A-63-1).
No. 32797). This pipe is supplied to the primary rolling mill PR without cutting, and is reduced in diameter. Then, it passes through the primary annealing device PA, further undergoes slow cooling (100), passes through the water cooling device WC, and is further reduced in diameter by the secondary rolling mill SR.
Thereafter, the coil is wound through processes such as secondary annealing, water cooling, pickling, washing with water, plating, washing, and drying. In order to increase the production efficiency, it is preferable to continuously perform the process from the strip to the coil winding. In this case, the primary rolling increases the pipe transfer speed to be higher than the strip transfer speed, and causes the secondary rolling. This further increases the transfer speed. The pipe is cut in coil units at the coil winding stage. The coiled pipe is then unwound at a payoff stand, further reduced in diameter by a finish wire drawing machine, and wound around a product coil.

If the pipe to be processed is continuously transferred between the primary rolling mill PR and the secondary rolling mill SR without cutting the pipe, the pipe transfer distance for slow cooling (100) is increased (for example, 1 pipe).
00m). In addition, in the primary rolling mill PR and the secondary rolling mill SR, since the pipe tension affects the pipe wall thickness and the like, the primary rolling mill PR and the secondary rolling mill SR are provided between the primary rolling mill PR and the secondary rolling mill SR. Tension must be buffered so as not to apply pipe tension to the SR.

Japanese Patent Application Laid-Open No. Hei 2-135680 discloses that a large number of guide rollers are arranged at a predetermined pitch on the same circumference, and a wire is wound around these rollers as if they were coil bobbins. 2. Description of the Related Art A wire storage device for temperature processing that stores wire while maintaining a feed movement of a wire has been proposed.
According to this, it is not necessary to secure a long wire transfer distance.

[0005]

However, since the guide rollers are wound as a coil bobbin around a wire rod, the stored dose is constant and there is no function of buffering the difference between the entrance and exit speeds. If the inlet-side wire speed and the outlet-side wire speed of the wire storage device are not equal, slack or tightening of the coil winding material occurs, and the coil wire hits the lining heat insulating material or guide roller groups, and the arrangement circles thereof are changed. Tightening in the shrinking direction causes the wire tension to fluctuate greatly in the wire storage device. Therefore, this wire storage device is, for example, a primary rolling mill P shown in FIG.
Between R and the secondary mill SR (at position 100)
When the pipes are transferred in a continuous manner, the inlet and outlet speeds of the pipes must be equalized in the wire storage device, and this gives pipe tension to the primary rolling mill PR or the secondary rolling mill SR. That is, disturbance in rolling is given. On the other hand, in the primary rolling mill PR or the secondary rolling mill SR,
When the pipe feeding speed or the pipe drawing speed changes for controlling the wall thickness, the coil wound pipe becomes slack or tightened in the wire storage device, and the pipe tension fluctuates. That is, the above-described conventional wire storage device does not have a buffering function for the inlet and outlet pipe tensions and the storage amount, and is difficult to use for applications requiring this kind of function.

[0006] The present invention provides a storage volume adjustment function,
An object of the present invention is to provide a strip accumulator having an inlet / outlet speed difference buffering function and an inlet / outlet side tension difference buffering function.

[0007]

According to the present invention, there is provided a coil accumulator having a coil supporting roller (50) having a circumferential surface for suspending and supporting each loop of a coil (30c). ; Strip (30i)
Roller (24-27) for pulling in the wire (30-27);
c) a delivery roller for sending out (36 to 43); a coil support roller (5)
0) a coil outer diameter regulating roller (51-55) located outside the coil (30c) for limiting the coil outer diameter of the strip (30c) suspended around the coil (30); A member that is located inside the circle where the coil outer diameter regulating roller (51 to 55) circumscribes and the coil supporting roller (50) inscribes, circulates around the coil supporting roller (50), and is hung from it. In order to limit the inner diameter of the coil of (30c), an inner diameter regulating roller (5) located inside the coil (30c) is used.
7); The symbols in parentheses indicate corresponding elements in the embodiment shown in the drawings and described later.

[0008]

[Action] When the strip material (30i) drawn by the pull-in roller (24-27) is wrapped around the circumferential surface of the coil support roller (50), the strip material (30i) supports the coil. The coil (30c) orbits around the roller (50) and is suspended from the roller (50). Corresponding to the entry side velocity (Vi) and the exit side velocity (Vo) of the strip, when both are equal, the stored amount in the accumulator is constant, so the coil
The diameter of (30c) does not substantially change. However, the entry speed (Vi)
If the speed is higher than the outlet speed (Vo), the coil (30c) has a larger winding amount than the rewind amount, so that a compressive force acts on the coil (30c) from the inlet side to the outlet side, and the coil diameter increases. Conversely, the outlet speed (V
If (o) is higher than the entry speed (Vi), the coil (30c) has a larger unwinding amount than the coil (30c), so the tensile force acts on the coil (30c) from the exit side to the entry side and the coil diameter decreases . That is,
The coil diameter changes automatically according to the difference in the exit side speed, so that no extraordinary tension fluctuation occurs in the strip in the accumulator.
It does not cause extraordinary strip tension fluctuation on the inlet and outlet sides (storage buffer function / tension buffer function).

Outside the coil (30c), there is a coil outer diameter regulating row.
(51-55), the maximum outer diameter (Cdmax) of the coil (30c)
Is a coil support roller (50) and a coil outer diameter regulation roller.
(51-55). Further, since the coil (30c) includes the coil supporting roller (50) and the inner diameter regulating roller (57), the minimum inner diameter (Cdmix) of the coil (30c) is regulated at these positions. By the way, the inner diameter regulating roller (57) is circumscribed by the coil outer diameter regulating rollers (51 to 55), and the coil supporting roller is
(50) is located inside the inscribed circle, and since the strip goes around the coil support roller (50) and hangs on it, the maximum outer diameter (Cdm
ax) and the circle with the minimum inner diameter (Cdmin) share the circumference of the coil support roller (50) as a common point.
The coil diameter automatically changes according to the difference between the inlet and outlet speeds.
Inlet speed (Vi) is higher than outlet speed (Vo)
When the coil diameter reaches the maximum outer diameter (Cdmax) at a certain position in the direction in which the central axis of (50) extends, the increase in the diameter is restricted by the increase in the diameter, and the increase in the diameter spreads in the direction, and the maximum outer diameter (Cdmax) gradually increases. Cdmax)
The number of loops that have become larger increases. Conversely, when the exit side velocity (Vo) is higher than the entrance side velocity (Vi) and the coil diameter reaches the minimum inner diameter (Cdmin) at a position in the direction in which the center axis of the coil supporting roller (50) extends, the diameter is there. As the decrease in diameter is restricted, the diameter decreases in this direction, and the number of loops having the minimum inner diameter (Cdmin) gradually increases. As described above, each loop of the coil (30c) has a storage buffer function of a difference between the circumference of the circle having the maximum outer diameter (Cdmax) and the circumference of the circle having the minimum inner diameter (Cdmin), and the accumulator as a whole has The storage buffer amount is multiplied by the number n of loops that can be stored. Theoretically, the minimum storage is Cdmin × π × n,
Maximum storage is Cdmax × π × n, buffer is (Cdmax−Cdmin)
× π × n.

In a preferred embodiment of the present invention, the entry speed (V
i) and the value obtained by adding the change integration amount obtained by integrating the storage change amount per unit time (Ts) due to the difference between the outlet speed (Vo) and the storage initial value, as the current storage amount (AL), This is displayed on the display means (8). Also, in order to prevent an abnormal situation such as when the storage amount exceeds the upper limit or falls below the lower limit, a coil diameter limit detection means (SLi, SSo) for detecting that the coil diameter has reached the set limit value is provided, When the detecting means (SLi, SLi of SSo) detects that the set maximum diameter has been reached, in response to this, the drive of the draw-in rollers (24 to 27) is stopped and this is notified to the strip material supply side, and the detecting means ( SLi, SSo SS
When o) detects that the set minimum diameter has been reached, in response to this, the driving of the feed rollers (36 to 43) is stopped and this is reported to the strip material receiving side. Further, the strip material (30i) to be drawn in by the drawing rollers (24 to 27).
Roller that gives a bend in the direction to embrace the circumferential surface
(28) and a position adjusting mechanism (29, Mc) for adjusting the pressing position of the curling roller (28) with respect to the strip to adjust the bending to a large or small value. From the difference between the outlet speed (Vo) and the difference (Vds = Vi-Vo), the increase / decrease in the amount of material stored is determined.When the amount of material storage increases, the roller with a habit is provided via the position adjusting mechanism (29, Mc). The bending amount of the strip (30i) according to (28) is reduced, and the bending amount is increased when the storage amount of the strip decreases (proportional control = P control). In addition, the difference between the entry speed (Vi) and the exit speed (Vo) (Vds
= Vi-Vo), the increase or decrease in the amount of stored bar material is detected from the temporal change (dVd = Vdp-Vds). When there is a tendency, the bending is increased (differential control = D control). Furthermore, the current storage volume
Corresponding to (AL), when the number is large, the bending is small, and when it is small, the bending is large (integral control = I control).

Hot pipes are easy to bend and have a hammered roller (28)
Is not always necessary, but cold pipes are relatively hard to bend. In this embodiment, the bending habit is forcibly applied by the curling roller (28), the bending habit is adjusted by adjusting the pushing position of the curling roller (28), and the adjustment is performed by the input side speed ( Vi), outlet speed
(Vo) and the stored amount (AL) are controlled by the PID control, so that the strip material bending amount is not affected so much, and the strip material storage amount at that time is high or low, and the strip material storage speed is high. Appropriate bending corresponding to the tendency of low and storage speed changes is realized, and the coil diameter change and the movement of each coil loop from the entry side to the exit side become smooth inside the accumulator (100), Abundant tension, compression force and torsion force are not applied, and the stored amount buffer and the tension buffer become extremely smooth.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0013]

FIG. 1 shows a side view of an embodiment of the present invention, and FIG.
Shows a top view, and FIG. 3 shows a configuration of an electric control system. In addition,
The accumulator 100 shown in these drawings is used as the accumulator 100 shown in FIG. 7 for slowly cooling the flux-cored pipe in the course of manufacturing the flux-cored wire and buffering the stored amount (tension buffer). is there. First, refer to FIG. 1 and FIG.

[General Structure of Accumulator Base Frame] A horizontal base 10 installed on the floor has vertical frames opposed to each other.
The arms 17 and 20 are fixed. Opposite frame plates 11 and 12 are fixed to these vertical frames 17 and 20 at angles 15 to 18, respectively. Frame rods 13 and 14 are fixed to the plates 11 and 12, and the rods 13 and 14 are used to fix the plate 1.
The vertical frames 17 and 20 are connected via 1 and 12.

[Structure on the Pipe Retracting Side (Inlet Side)] A retracting roller frame 21 is fixed to the upper end of the vertical frame 17, and a retractable strip guide 23 is fixed to the frame 21. In addition, pull-in rollers 24 to 27 are rotatably mounted. Lower roller 2 of pull-in rollers 24-27
The positions of the rotating shafts of the upper and lower rollers 24 and 26 can be adjusted vertically, and the hand knob 24m of the upper and lower position adjusting mechanism is screwed clockwise. As a result, the roller 24 moves downward,
The gap between the pair 24/25 is reduced. The pinching force of the roller pair 24/25 can be adjusted by the knob 24m.
The same applies to the roller pair 26/27. The lower rollers 25 and 27 are rotationally driven by an electric motor (motor) Mi via a power transmission mechanism and a speed reducer.
The flux-containing pipe (entrance side) 30i that has passed through 3 is driven to the left in FIGS. 1 and 2. A rotary encoder Ri is connected to the rotation axis of the motor Mi.
The encoder Ri generates an electric pulse Pi having a cycle inversely proportional to the drawing speed Vi of the pipe 30i.

A pipe 30 projecting to the left of the rollers 26 and 27
A roller 28 with a hammer is applied to i from above, and this gives a downward bending to the pipe 30i. Roller with habit 28
Is connected to the vertical drive mechanism 29. The mechanism 29 includes a guide that restrains rotation of the roller support rod but allows vertical movement, a nut coupled to a male screw of the roller support rod,
A guide that allows rotation of the nut but restricts vertical movement, a mechanism that transmits the rotational force of the motor Mc to the nut, an upper limit switch LcU that detects when the roller support rod reaches the upper limit position, and detects when the lower limit position is reached. The lower limit switch LcL is included. When the motor Mc rotates forward, the hammered roller 2
8 descends and the bending given to the pipe 30i becomes large (the radius of curvature becomes small), and the pipe 30i draws a loop with a small radius. Conversely, if the motor Mc reverses, the hammering roller 28
Rises and the bending given to the pipe 30i becomes small (the radius of curvature becomes large), and the pipe 30i draws a large radius loop.

[Structure of coil guide] Vertical frame 1
The coil winding drum 50 for rotating the coil is rotatably supported by the coils 7 and 20. This drum 50
The motor Md is rotated counterclockwise (FIG. 1) by a motor Md via a power transmission mechanism and a speed reducer. A rotary encoder Rd is connected to the rotating shaft of the motor Md, and the encoder Rd generates an electric pulse Pd having a cycle inversely proportional to the peripheral speed VD of the drum 50.

Rollers 51 to 54 for regulating the expansion of the coil are rotatably supported on the vertical frames 17 and 20. The rollers 51 to 54 are arranged so that their outer peripheral surfaces circumscribe a single circle (a pipe loop having a maximum coil outer diameter Cdmax) in which the outer peripheral surface of the drum 50 is inscribed. In addition, another row for regulating coil swelling.
A roller 55 is rotatably mounted on a carriage vertically movably supported by slide guides fixed to the vertical frames 17,20. The carriage is always pulled upward by a tension coil spring 56. As the carriage moves up and down, the roller 55 has an outer diameter Cdmax.
Pipe loop (Large-diameter loop indicated by two-dot chain line in FIG. 1)
Can be moved from the upper standby position to the lower evacuation position so as to cross in the radial direction. Pipe formed into a loop by bending added by the curling roller 28, that is, a coil 30c
Is located above the roller 55. That is, the coil 30
Roller 55 will be located outside of c. Coil 3
When the diameter of 0c increases, it hits the roller 55 and the roller 5
Press 5 down. When the roller 55 is moved immediately before the evacuation position by this push, the switch SLi for detecting the pull-in limit is switched from open (off) to closed (on) by the carriage supporting the roller 55.

Near the center of the pipe loop having an outer diameter of Cdmax, there is provided a roller 57 for restricting the contraction of the coil. The roller 57 is vertically movably supported by slide guides fixed to the vertical frames 17 and 20. Mounted rotatably on the carriage. The carriage is always pulled downward by a tension coil spring 58. When the carriage moves up and down, the roller 57 moves from the lower standby position so as to cross a pipe loop having an outer diameter Cdmin (a small-diameter loop indicated by a chain line in FIG. 1) in the radial direction. It can move to the upper retreat position. The pipe, that is, the coil 30c, which has formed a loop by bending added by the curling roller 28, is
It is located below. That is, the row is inserted inside the coil 30c.
LA 57 will be located. When the diameter of the coil 30c decreases, it hits the roller 57 and pushes the roller 57 upward. When the roller 57 moves just before the evacuation position by this push, the switch SSo for detecting the sending limit is switched from open (off) to closed (on) by the carriage.

The pipe 30i is formed into a loop by the bending applied by the curling roller 28, and becomes a coil 30c to form a drum 5d.
Orbit around zero. When the diameter of the coil 30c is larger than Cdmin and smaller than Cdmax, the coil 30c is supported only by the drum 50 and is driven to rotate by the drum 50, and the direction in which the central axis of the drum 50 extends continuously while maintaining the coil shape. Go to

[Structure of Pipe Pull-Out Side (Outlet Side)] A delivery roller frame 22 is fixed to the upper end of the vertical frame 20, and a delivery strip guide 31 is fixed to the frame 22. The pipe support rollers 32 and 33 and the delivery rollers 36 to 43 are rotatably mounted. Sending row
Lower rollers 37, 39, 41, 43 of the rollers 36 to 43
The positions of the rotating shafts are fixed, but the rotating shafts of the upper rollers 36, 38, 40, and 42 can be adjusted vertically, and the hand knob 36m of the up-down position adjusting mechanism is turned clockwise. By screwing, the roller 36 moves downward,
The gap between the roller pair 36/37 is reduced. Knob 36
The pinching force of the roller pair 36/37 can be adjusted by m. The same applies to the roller pairs 38/39, 40/41, 42/43. Lower rollers 37, 39, 41, 43
Is driven by a motor Mo via a power transmission mechanism and a speed reducer, whereby the flux-cored pipe (outside) 30o passing through the guide 31 is sent to the left in FIGS. 1 and 2 to be driven. You. A rotary encoder Ro is connected to the rotation shaft of the motor Mo, and the encoder Ro generates an electric pulse Po having a cycle inversely proportional to the delivery speed Vo of the pipe 30o.

Between the pair of rollers 32/33 and 36/37, there is a straightening roller 34, which is a pipe 3
0o, which corresponds to the roller pair 32/33 and 36.
/ 37 is pressed down to straighten by pressing down the pipe 30i (there is a bend to form an upwardly convex bow due to the bending of the hammered roller 28). That is, the bending given by the curling roller 28 is substantially eliminated. A support rod for supporting the correction roller 34 is connected to a vertical drive mechanism 35. The mechanism 35 includes a guide that restricts rotation of the roller support rod but allows vertical movement, a nut coupled to the external thread of the roller support rod, a guide and nut that permits rotation of the nut but restricts vertical movement. Is rotated, and a hand knob 34m is fixed to the input shaft of the nut rotation drive mechanism. When the knob 34m is turned clockwise, the straightening roller 34 descends and the pipe 3
When the correction force applied to 0i increases, and when the knob 34m is turned counterclockwise, the correction roller 34 rises and the correction force decreases. Therefore, the correction force can be adjusted with the hand-operated knob 34m.

[Structure and Control Operation of Electric Control Device] Referring to FIG. In addition, please refer to FIG. 1 and FIG. 2 together. The above-mentioned motors Mc, Md, Mi and Mo are connected to motor drivers 2c, 2d, 2i and 2o, respectively, and these motor drivers are connected to controllers 1c, 1d, 1i and 1o, respectively. The motor is energized according to the instruction, and the instructed current is supplied to the motor.

When power is supplied to the controller 1c, the upper limit switch LcU is closed (the hammering roller).
It is checked whether or not the motor 28 is at the origin position). If it is not closed, the motor Mc is driven in the reverse direction. If the switch LcU is closed, the motor Mc is stopped there. After that, when the CPU 4 gives the position (bending amount) target value Sp of the correction roller 28,
The roller 28 is driven to the target position Sp. Control
La 1c maintains the position count value Spa (the value held in the internal register) at 0 while the upper limit switch LcU is closed, and sets the maximum value while the lower limit switch LcL is closed.
While the upper limit switch LcU and the lower limit switch LcL are open, when the motor Mc is normally energized, the rotary encoder Rc generates one pulse Pc while the upper limit switch LcU and the lower limit switch LcL are open. To the position count value Spa
When the rotation is performed and the reverse rotation is energized, the position count value Spa is decremented by one each time the rotary encoder Rc generates one pulse Pc. Count value S
pa represents the actual position of the curled roller 28. The controller 1c urges the motor Mc forward or reverse so that the count value Spa becomes the target value Sp, and stops the motor Mc when Spa = Sp. A relay is inserted in each of the forward rotation energizing circuit and the reverse rotation energizing circuit of the motor driver 2c. When the switch LcL is closed, the forward rotation energizing circuit is opened, and when the switch LCU is closed, the reverse rotation energizing circuit is opened. In other words, the motor Mc is rotated forward and the correction roller 28 is rotated.
When the switch LcL is closed while the motor is driven downward, the forward rotation of the motor Mc is stopped there. Conversely, when the switch LcU is closed while the motor Mc is rotated in reverse to drive the correction roller 28 upward, the rotation of the motor Mc is stopped there. The controller 1d is a constant speed control device for controlling the rotation speed of the motor Md (the peripheral speed VD of the drum 50) to the speed specified by the CPU 4, and includes a rotary encoder Rd.
The peripheral speed VD of the drum 50 is calculated from the pulse Pd generated by the motor driver 2d so that the peripheral speed VD becomes the target peripheral speed given by the CPU 4 via the motor driver 2d.
Control the speed of the car.

The controller 1i is a speed control device having a PLL (constant speed control by phase synchronization) function. The controller 1i outputs a finger speed pulse Pp having a frequency proportional to the pipe sending speed of the primary rolling mill PR to a rotary encoder. -The motor Mi is accelerated and decelerated via the motor driver 2i so as to synchronize the pulse Pi generated by the dam Ri. That is, the primary rolling mill P
The pull-in speed Vi of the pull-in rollers 24-27 is matched with the R pipe delivery speed. Since this is performed by the PLL function, when the pipe feed speed of the primary rolling mill PR changes, the pull-in speed V of the pull-in rollers 24-27 also changes in conjunction with this.
i changes. A relay is inserted in a circuit for energizing the motor Mi of the motor driver 2i.
When the switch SLi for detecting the pull-in limit is closed, the
The current supply circuit to the data Mi is opened. That is, the motor Mi is stopped. As a result, the drawing drive of the pipe 30i is stopped.

The controller 1o is a speed control device having a PLL (constant speed control by phase synchronization) function. The controller 1o outputs a finger speed pulse Ps having a frequency proportional to the pipe drawing speed of the secondary rolling mill SR to a rotary encoder. -The motor Mo is accelerated and decelerated via the motor driver 2o so as to synchronize the pulse Po generated by the motor Ro. That is, the secondary rolling mill S
The delivery speed Vo of the delivery rollers 36 to 43 is matched with the pipe pull-in speed of R. Since this is performed by the PLL function, when the pipe drawing speed of the secondary rolling mill SR changes, the delivery speed Vo of the delivery rollers 36 to 43 also changes in conjunction with the change. A relay is interposed in an energizing circuit for the motor Mo of the motor driver 2o, and the driver 2o
When the switch SSo for detecting the transmission limit is closed, the circuit for energizing the motor Mo is opened. That is, the motor Mo is stopped. As a result, the delivery driving of the pipe 30o is stopped.

The communication controller 1m controls mutual communication such as control signals between the CPU 4 and the primary rolling mill PR and the secondary rolling mill SR. Once the production of flux cored wire has started, even while the production is stopped,
The steel strip and pipes continue through the entire installation shown in FIG. When a break occurs for some reason, the broken portion is connected by welding. When the equipment is operated, the downstream equipment is sequentially driven from the upstream equipment, and the primary rolling mill PR supplies a start signal to the CPU 4 via the controller 1m when it is started. The CPU 4 responds to the start signal to control the controllers 1d, 1i, 1o.
, And a start signal to the secondary rolling mill SR via the controller 1m. Secondary rolling mill SR
Fires in response to this.

The CPU 4 has an input / output (I / O) port 3
, The controllers 1c, 1d, 1i, 1o and 1m and the operation / display board 8 are selectively connected. This connection is made via the system controller 5 to the CPU.
4 specifies. A ROM 6 and a RAM 7 are connected to an address bus and a data bus of the CPU 4. The system controller 5 outputs a control signal designated by the CPU 4 to the RO.
M6, RAM7 and I / O port 3.

When power is supplied to itself, the CPU 4
Sets the standby signal level to its input / output port,
Initializes the internal registers, counters, timers, etc., and displays information on standby on the operation / display board 8, and waits for all controllers 1c, 1d, 1i, 1o and 1m to generate ready signals. When all the controllers generate a ready signal, the operation / display board 8 indicates that the input is ready. The controllers 1c, 1d, 1i, 1o
And 1m and 1r respectively execute initialization when power is turned on, perform state detection, initial positioning, etc., and give a ready signal to the CPU 4 when operation is enabled. When the inoperable state is detected, it is given to the state data CPU 4 indicating this. The CPU 4 decodes the status data and notifies the operation / display board 8 of the abnormality. By initializing the controller 1c, the hammered roller 28
Is the uppermost position (LcU closed).

Next, the CPU 4 waits for an input to the operation / display board 8 and a start signal from the primary rolling mill PR.
When there is an input, an input process corresponding to the input is performed. The required inputs are as follows. The position Sp (bending amount: standard value Sps) of the curling roller 28, the pipe feeding speed of the primary rolling mill PR (= Vi: standard value V)
is), Pipe pull-in speed of secondary rolling mill SR (= Vo: standard value V)
os), the peripheral speed VD of the drum 50 (≒ Vi: standard value Vis), the pipe storage amount AL (standard value ALs), coefficients a, b and c (calculation formula of step 6 in FIG. 4).

Standard values as, bs and cs), judgment reference values ALaes, ALass, Spmaxs and Spmins
(Steps 8 to 11 in FIG. 4. Standard values ALae, ALas, S
pmax and Spmin). When these inputs are made, the input values are written to the register (the memory area with the CPU 4 or the RAM 7) addressed to them. Note that the CPU 4 stores the ROM in the ROM 6 at the end of the initialization.
Is written in the register, and even if there is no input, data exists in each register.

When a start signal arrives from the primary rolling mill PR, the CPU 4 starts a timer Ts (Ts is a sampling period) and executes it in response to the time over (elapse of the time Ts). The internal interrupt (FIG. 4) is permitted, and the external interrupt (FIGS. 5 and 6) executed in response to the pulses Pi and Po generated by the rotary encoders Ri and Ro is permitted. An input reading process of the display board 8 and a reading process of control signals from the primary and secondary rolling mills PR and SR are performed. While there is no such input, substantially only the interrupt processing described later is performed. In addition,
The operation / display board 8 has a switch and a knob for manual intervention, and in addition to speeding up, deceleration, and stopping, it is also possible to manually instruct the sole drive of the accumulator only on the board 8. But,
Hereinafter, only the contents of the automatic driving will be described.

First, the contents of the "external Pi interrupt" IPi shown in FIG. 6 for detecting the pull-in speed Vi will be described. By permitting the external interrupt as described above, the CPU 4 executes the "external Pi interrupt" IPi shown in FIG. 6 every time the rotary encoder Ri generates one pulse Pi. That is, a register ICRi that counts the number of pulse arrivals
Is incremented by 1 (step 21; hereinafter, in the parentheses, the word "step" is omitted and only No. is written), and it is checked whether the value ICRi has reached the set value ICis (22). If not, the interrupt process ends here. If it has reached, register ICRi
Is cleared (initialized) (23), and the time counter TCRi is cleared.
The speed Vi is calculated from the clock value TCRi, and the calculated value is written into the register Vi (24). Note that Vi = k · Icis /
In TCRi, k · Icis is a constant value. The calculation of this Vi and the update writing to the register Vi are performed when the pulse Pi
This is performed every time is is generated, and the register Vi always stores data indicating the pipe drawing speed Vi at that time.

The contents of the "external Po interrupt" IPo shown in FIG. 7 for detecting the sending speed Vo will be described. By permitting the external interrupt as described above, the CPU 4 executes the "external Po interrupt" IPo shown in FIG. 6 every time the rotary encoder Ro generates one pulse Po. That is,
The content of the register ICRo for counting the number of arrivals of pulses is incremented by 1 (31), and it is checked whether the value ICRo has reached the set value ICos (32). If not, the interrupt process ends here. If it has reached, the register ICRo is cleared (initialized) (3
3) The speed V is obtained from the clock value TCRo of the clock counter TCRo.
o is calculated and the calculated value is written into the register Vo (34). Note that Vo = k · Icos / TCRo, and k · Icos is a constant value. The calculation of Vo and the update writing to the register Vo are performed every time ICos pulses Po are generated, and the register Vo always stores data indicating the pipe sending speed Vo at that time. become.

When the timer Ts has timed out, the CPU 4 executes an "internal timer Ts interrupt" ACC shown in FIG. That is, first, the timer Ts is restarted (step 1), and a difference Vds (reservation speed; positive is accumulation, negative is discharge) between the pipe drawing speed Vi and the delivery speed Vo is calculated (2). Note that Vi is the data of the register Vi calculated in the interrupt processing of FIG. 6, and Vo is the data of the register Vo calculated in the interrupt processing of FIG. The CPU 4 then calculates the difference dVd between the pull-in / delivery speed difference Vdp calculated last time (Ts before this time) and the speed difference Vds calculated this time (the change amount of the speed difference between Ts: storage acceleration: positive is accumulated The acceleration (negative is the ejection acceleration) is calculated (3). And the difference Vd calculated this time
s is updated and written to the register Vdp in order to use s as the previous value the next time (after Ts from now) (4). CPU4
Next, the storage speed Vds is multiplied by the sampling period Ts to calculate the storage change amount Ts · Vds = Ts · (Vi−V
o) is calculated, and this is calculated as the stored amount AL (register A) before Ts.
L), and the obtained sum is updated and stored in the register AL (5). Then, the PID operation Sp = a · Vds + b · dVd + c · AL = a · (Vi−Vo) + b · dVd + c · AL (1), which corresponds to the current storage speed Vds, storage acceleration dVd, and storage amount AL. , Target position S of the hammered roller 28
p (corresponding to the amount of bending of the pipe 30i) is calculated (6).
When the storage speed Vds is positive, the accumulation is performed, and when the storage speed Vds is positive, the discharge is performed. When the storage speed Vds is positive, the diameter of the coil 30c is increased (Sp
Smaller) can cope with larger accumulations. When the value is negative, reducing the coil diameter 30c (increase Sp) is more suitable for prompt pipe delivery. Therefore, the coefficient a of the P term is a negative value. The positive value of the storage acceleration dVd is the storage acceleration, and the negative value is the discharge acceleration. When the storage acceleration dVd is positive, increasing the diameter of the coil 30c (decreasing Sp) matches the increase in the storage speed. When negative, it is suitable for reducing the coil diameter 30c. Therefore, the coefficient b of the D term is also a negative value. When the current storage amount AL is large, the remaining capacity is small, and the coil 30 is used to secure the remaining capacity as much as possible.
It is preferable to increase the diameter of c (decrease Sp). When the storage amount AL is small, the dischargeable amount is small, so that the coil 3 is used to shorten the residence time in the accumulator.
It is preferable to reduce the diameter of 0c (increase Sp). Therefore, the coefficient c of the I term is also a negative value. Note that the coefficient a is a positive value when the calculation formula Vds = Vi−Vo is satisfied and Vds = Vo−Vi. Similarly, dVd = Vd
When s-Vdp is set to dVd = Vdp-Vds, the coefficient b is a positive value.

Next, in order to display the loop diameter Cd of the pipe 30i represented by the current bending on the operation display board 8, it is formed when the curled roller 28 is at the position Sp. The loop diameter Cd is calculated (7). Next, the storage amount A
It is checked whether L is within a set range (ALas or more and less than ALae) (8, 9), and if it exceeds the set upper limit ALae, the primary mill PR and the secondary mill SR have a large storage amount (primary mill PR). To reduce the rolling speed
The secondary mill SR is informed of a request to increase the rolling speed, and the currently held data Vi, Vo, AL and C are stored.
d is updated and displayed on the operation / display board 8 (12). When the value is less than the set lower limit value ALas, the amount of storage in the primary rolling mill PR and the secondary rolling mill SR is small (a request for increasing the rolling speed for the primary rolling mill PR / a reduction in the rolling speed for the secondary rolling mill SR) Is issued, and the currently held data Vi, Vo, AL and Cd are updated and displayed on the operation / display board 8 (13). Next, the CPU 4 sets the hammering roller 28.
Is checked (10, 11) to determine if the target position Sp is within the set range (not less than Spmin and not more than Spmax), and the set upper limit value Spmax is checked.
Is exceeded, the content of the register Sp storing the Sp calculated in step 6 is updated to Spmax.
The loop diameter Cd represented by ax is calculated, and the calculated Cd is updated and displayed on the operation / display board 8 (14). If the value is less than the set lower limit value Spmin, the contents of the register Sp storing Sp calculated in step 6 are updated to Spmin, the loop diameter Cd represented by this Spmin is calculated, and the calculated Cd is operated / operated. The updated information is displayed on the display board 8 (15). When both the stored amount AL and the target position Sp calculated in step 6 are within the set range, the currently held data Vi, Vo, AL and Cd are updated and displayed on the operation / display board 8 (16). ).

Next, the CPU 4 transfers the data of the register Sp to the controller 1c as target position information, and in response to this, the controller 1c determines the position of the hammering roller 28. Change to the target position Sp (17). Next, the CPU 4 calculates the target peripheral speed VD of the drum 50 as follows: VD = Vi · (Sp / Sps) (2) (18). Sps is a position of a hammered roller 28 for making the coil 30c a standard diameter. When the target position Sp calculated as described above provides a loop smaller in diameter than the standard diameter, that is, when Sp is larger than the standard position Sps, the peripheral speed VD of the drum 50 is higher than the pipe drawing speed Vi. Since the drum 50 tries to feed the pipe quickly, the loop can be reduced in diameter. vice versa,
When Sp is smaller than the standard position Sps, the peripheral speed VD of the drum 50 becomes smaller than the pipe drawing speed Vi,
Since the pipe feed of the drum 50 is delayed, the loop tends to have a large diameter. As described above, the loop diameter can be adjusted to a lesser extent depending on the relative relationship between the pipe drawing speed Vi and the peripheral speed VD of the drum 50. In this embodiment, when a small-diameter loop is to be formed by the curling roller 28 by utilizing this, the peripheral speed of the drum 50 is made faster than Vi to promote the formation of the small-diameter loop, and When a large diameter loop is to be formed by the attached roller 28, the peripheral speed of the drum 50 is set to V
It is made slower than i to encourage the formation of a large diameter loop. That is, the CPU 4 transfers the target peripheral speed VD calculated in step 18 to the controller 1d, and the controller 1d responds to this by setting the peripheral speed of the drum 50 to the target value VD.
The rotation speed of the motor Md is controlled so that
9).

The CPU 4 repeats the "internal timer Ts interrupt" ACC shown in FIG.
By this repetition, the current storage amount AL is always displayed on the operation / display board 8. In addition, P control for reducing the amount of bending of the pipe 30i by the curled roller 28 when the storage amount increases, and increasing the bending amount when the storage amount decreases,
The difference between the pipe pull-in speed Vi and the pipe delivery speed Vo (Vds
= Vi-Vo) over time (dVd = Vds-Vdp)
A decrease tendency is detected, and in response to the increase or decrease tendency, the amount of bending is reduced when the increase tendency is found, and the bending amount is increased when the decrease tendency is found. Sometimes I control is performed in which the bending is small and the bending is large when the bending is small, and an appropriate bending corresponding to the pipe pulling speed Vi, the pipe sending speed Vo and the storage amount AL is realized every moment. In the accumulator 100, the coil diameter change and the movement of each coil loop from the pipe retracting side to the pipe delivering side become smooth, so that excessive tension, compressive force and torsion force are not applied to the pipe, and the storage amount buffer and The tension buffer becomes very smooth.

In the embodiment described above, the hammered roller 2
8 is a pipe 30i into which the draw-in rollers 24-27 are drawn,
Since the bending in the direction of embracing the circumferential surface of the coil driving drum 50 is given, the pipe 30i becomes a coil 30c orbiting the coil driving drum 50 and is suspended from the drum 50. Corresponding to the pipe pull-in speed Vi and the pipe delivery speed Vo, when both are equal, the diameter of the coil 30c does not substantially change since the storage amount in the accumulator is constant. However, if the pipe retraction speed Vi is higher than the pipe delivery speed Vo, the coil 30c has a larger winding amount than the rewinding amount of the coil 30c, so that a compressive force acts on the coil 30c from the pipe retraction side to the pipe delivery side to reduce the coil diameter. Increases automatically. Conversely, the pipe sending speed Vo is equal to the pipe drawing speed V.
If it is higher than i, the coil 30c has a larger unwinding amount than the winding amount, so that a tensile force acts on the coil 30c from the pipe sending side to the pipe drawing side, and the coil diameter is automatically reduced.

Outside the coil 30c, there is a coil outer diameter regulating row.
Since there is a diameter 51-55, the maximum outer diameter Cd of the coil 30c
max is regulated by the positions of the coil driving drum 50 and the coil outer diameter regulating rollers 51 to 55. Also, the coil 30
Since the coil driving drum 50 and the inner diameter regulating roller 57 are included in the position c, the minimum inner diameter Cdmin of the coil 30c is regulated at these positions. By the way, inner diameter regulation roller 5
7 is located inside the circle where the coil outer diameter regulating rollers 51 to 55 are circumscribed and the coil driving drum 50 is inscribed, and the pipe circulates around the coil driving drum 50 and hangs therefrom, so that the maximum outer diameter Cdmax is The circle and the circle with the minimum inner diameter Cdmin are
In both cases, the circumferential surface of the coil driving drum 50 is used as a common point, and the coil diameter automatically changes in the range between the two circles in accordance with the difference in the speed of incoming and outgoing pipe. At a position where the pipe drawing speed Vi is higher than the pipe sending speed Vo and the center axis of the coil driving drum 50 extends, the coil diameter becomes the maximum outer diameter Cdmax.
Is reached, the increase in the diameter is regulated in that direction, and the increase in the diameter spreads in this direction, and the maximum outer diameter Cdmax loop number gradually increases. Conversely, when the coil diameter reaches the minimum inner diameter Cdmin at a certain position in the direction in which the center axis of the coil driving drum 50 extends, where the pipe delivery speed Vo is higher than the pipe drawing speed Vi, the decrease in diameter is regulated there. The diameter decreases in the direction, and the minimum inner diameter Cdmin loop number gradually increases. As described above, each loop of the coil 30c has a storage buffering function for the difference between the circumference of the circle having the maximum outer diameter Cdmax and the circumference of the circle having the minimum inner diameter Cdmin, and the storage buffering capacity of the accumulator as a whole is , The number n of loops that can be accommodated. Theoretically, the minimum storage is Cdmin × π × n, and the maximum storage is C
dmax × π × n, and the buffer amount is (Cdmax−Cdmin) × π × n.

However, when some of the loops of the coil 30i are reduced in diameter and the rollers 57 are raised to the upper limit position by tightening these loops, the switch SSo is closed, whereby the motor driver 2o is closed. The motor energizing circuit opens, and the rotation of the delivery rollers 36 to 43 stops.
When some of the loops of the coil 30i have a large diameter and the rollers 55 are pushed down to the lower limit position by pushing these loops, the switch SLi is closed, whereby the motor is closed.
The motor energizing circuit of the motor driver 2i opens, and the rotation of the draw-in rollers 24 to 27 stops. By such a protection operation, excessive pipe withdrawal of the accumulator 100,
Excessive withdrawal of the pipe is prevented beforehand, and a pipe trouble and a failure of the accumulator in the keyhole machine 100 are prevented beforehand. Opening switches SLi and SSo /
The closing signals are the primary rolling mill PR and the secondary rolling mill SR, respectively.
And the primary rolling mill PR stops rolling in response to the closing of the switch SLi. In conjunction with this, the pipe forming machine PM also stops the pipe making process. The secondary rolling mill SR stops the rolling in response to the closing of the switch SSo, but since the pipe needs to flow in the downstream processing step, the pipe cutter PC
To cut the pipe.

When the material of the coil is soft, that is, when the coil is easy to bend, the coil itself is automatically looped in the accumulator according to the entrance and exit speeds of the coil, even if there is no hammering roller. Since the diameter of the pull changes, the control of the pressing position of the roller with a kink may be omitted, or the roller with a kink may be omitted.

[0043]

As described above, the accumulator of the present invention (1)
According to (00), the coil diameter automatically changes in accordance with the difference between the strip pull-in speed (Vi) and the delivery speed (Vo), and the tension of the strip (30c) in the accumulator is particularly high. Does not occur, and there is no particular variation in the tension of the strip on the strip supply side (PR) and the strip reception side (SR). In each loop of the coil in the accumulator,
Coil outline control roller (51) for coil winding roller (50)
55) and the circle with the minimum inner diameter (Cdmin) determined by the position of the coil-shaped regulating roller (57) relative to the coil rotating roller (50). There is a storage buffer function for the difference in circumference, and the storage buffer amount of the entire accumulator is multiplied by the number n of loops that can be accommodated.

[Brief description of the drawings]

FIG. 1 is an illustration of a strip accumulator 10 according to one embodiment of the present invention.
0 is a side view.

FIG. 2 is a plan view of the strip accumulator 100 shown in FIG.

FIG. 3 is a block diagram showing an electric element and an electric control device of the strip accumulator 100 shown in FIG.

FIG. 4 is a flowchart showing the content of a material storage control by a CPU 4 shown in FIG. 3;

FIG. 5 is a block diagram of the CPU 4 in response to a speed synchronization pulse Pp indicating a strip material sending speed from the primary rolling mill PR shown in FIG.
This is a flowchart showing the contents of the interrupt processing.

FIG. 6 is a block diagram of the CPU 4 in response to a speed synchronization pulse Ps indicating a strip pull-in speed from the secondary rolling mill SR shown in FIG.
This is a flowchart showing the contents of the interrupt processing.

FIG. 7 is a block diagram showing a part of a welding flux cored wire manufacturing line in which the strip accumulator 100 shown in FIG. 1 is provided.

[Explanation of symbols]

PM: Tube forming machine PR: Primary rolling mill PA: Primary annealing device 100: Strip accumulator WC: Water cooling device PC: Pipe cutter RT: Runout table SR: Secondary rolling mill Mi: Mo for drawing strip material Data Ri: Rotary encoder SLi: Switch for pull-in limit detection Mc: Motor for curving radius adjustment Rc: Rotary encoder LcU: Switch for upper limit detection LcL: Switch for lower limit detection Md: Motor for rotating the strip coil Rd: Rotary encoder Mo: Motor for feeding the strip Ro: Rotary encoder SSo: Switch for detecting the sending limit 1i, 1c, 1d, 1o : Motor controller 1m: Communication controller 2i, 2c, 2d, 2o: Motor driver 3: I / O port 4: CPU 5: System controller 6: RO 7: RAM 8: Operation / display board 10: Horizontal base 11, 12: Frame plate 13, 14: Frame rod 15, 16: Angle 17: Vertical frame 18: Angle 20: Vertical Frame 21: Retraction row
Laframe 22: Delivery roller frame 23: Retraction roller guide 24 to 27: Retraction roller 24m: Handwheel 28: Roller with habit 29: Vertical drive mechanism 30i: Retraction roller 30c: Strip Material coil 30o: Delivery material 31: Delivery material guide 32, 33: Correction support roller 34: Correction roller
L 34m: Hand-operated knob 35: Vertical drive mechanism 36-43: Sending roller 50: Coil-turning drum 51-54: Roller for regulating bulging of coil 55: Roller for regulating bulging of coil 56: Extension coil spring 57: Roller for restricting coil degeneration 58: Extension coil spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 41/00

Claims (7)

(57) [Claims] A coil support roller having a circumferential surface for suspending and supporting each loop of the coil; a retracting roller for retracting the coil; A feed roller for feeding a strip material wound around a coil; a coil outer diameter regulation roller positioned outside the coil for limiting the coil outer diameter of the strip material wound around the coil support roller. La;
And a coil outer diameter regulating roller for circumscribing the coil supporting roller and being positioned inside a circle where the coil supporting roller is inscribed, for restricting the coil inner diameter of the strip suspended around the coil supporting roller. A rod accumulator having an inner diameter regulating roller located in the coil. Wherein said coil support Russia - storage amount detecting means for detecting the strip material amount i.e. accumulation amount was circling into a coil La, and display means for displaying the detected storage amount, further comprising claim 1, wherein the of the elongated member accumulator - data. 3. The accumulator according to claim 1, further comprising coil diameter limit detecting means for detecting that the coil diameter of the coiled coil has reached a set limit value. 4. A curling roller for giving a bending in a direction of embracing the circumferential surface to a strip material to be drawn in by the drawing roller, and a curling roller for adjusting the bending to be large or small. A position adjusting mechanism for adjusting the pressing position of the roller, and a roll with a habit via the position adjusting mechanism when the increase or decrease in the amount of stored material is determined based on the speed of pulling in and feeding out the material. 2. The accumulator according to claim 1, further comprising coil diameter control means for reducing the bending of the strip by means of the above, and increasing the bending when the storage amount of the strip is reduced. 5. A curling roller for giving a bend in the direction of embracing the circumferential surface to a strip material to be drawn in by the retraction roller, and a kink for the strip material for adjusting the bending to be large or small. A position adjusting mechanism for adjusting the pressing position of the roller, and a time-based integration of a difference between the speed of pulling in the material and the speed of sending out the material, the amount of stored material is detected, and the amount of stored material corresponding to the amount of stored material is reduced. 2. The accumulator according to claim 1, further comprising: coil diameter control means for reducing the bending of the strip by the curling roller via the position adjusting mechanism when the number is large, and increasing the bending when the storage amount of the strip is small. Ta. 6. A curling roller for giving a bend in the direction of embracing the circumferential surface to the strip material to be drawn in by the retraction roller, and a curl for the strip material to adjust the bend large or small. A position adjusting mechanism for adjusting the pressing position of the roller, and an increase or decrease in the amount of stored material due to a temporal change in the difference between the material drawing speed and the feeding speed.
A coil diameter control means for detecting a decreasing tendency, and for reducing the bending of the strip by means of a curling roller via a position adjusting mechanism when the increasing tendency corresponds to the increasing or decreasing tendency, and for increasing the bending when decreasing. The accumulator according to claim 1, further comprising: 7. The apparatus according to claim 1, further comprising a straightening roller for substantially eliminating a bending habit of the fed strip.
Or the strip material accumulator according to 6.