JPH0128650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coiler in which wrapper rolls are arranged around the outer periphery of a mandrel, and the supplied strip is wound while being pressed against the mandrel by these wrapper rolls. The present invention relates to a wrapper roll control device that controls the pushing force of a wrapper roll.

For example, a down coiler, which is known as this type of coiler, as shown in FIG.
It is taken in by the pinch rolls 3a, 3b and guided to the outer circumference of the mandrel 4.
wrapper rolls 5a to 5d provided on the outer periphery of
Accordingly, it is wound up while being pressed against the same mandrel 4. In this case, the strip 2 that has started to be wound on the mandrel 4 has its first and second turns (or the nth and n+1th turns).
A step (the portion indicated by reference numeral 6 in FIG. 1) having a height corresponding to the thickness of the strip 2 is formed at the boundary between the strip 2 and the strip 2. Therefore, the wrapper rolls 5a~
When winding is performed with the wrapper rolls 5d constantly pressed against the strip 2, these wrapper rolls 5a to 5
When the strip d crosses the stepped portion 6, a strong impact force is generated, which causes so-called overlap scratches on the strip 2. Furthermore, in this case, each of the wrapper rolls 5a to 5d is flipped up toward the outside of the mandrel 4 due to the impact force, and during this time the wrapped state of the strip 2 becomes loose.
As a result, the winding cannot be tightened quickly, resulting in problems such as poor winding shape and surface scratches.

In order to solve such a problem, conventionally, just before the stepped portion 6 passes directly under each of the wrapper rolls 5a to 5d, the corresponding wrapper roll is lifted a predetermined distance from the surface of the strip 2, and immediately after passing directly below the wrapper roll, A control method has been proposed in which the strip is pressed against the strip 2 again. That is, FIG. 2 conceptually shows the above control in correspondence with the relative positional relationship between the strip 2 wound around the mandrel 4 and a certain wrapper roll (for example, wrapper roll 5c). Then, the wrapper roll 5c passes through each step portion 6, 6, ... during each period T ₁ , T ₄ , T ₇ , ...
, the surface of the strip 2 is lifted a sufficient distance to avoid these steps 6. Also, in each period T ₂ , T ₅ , ... immediately after each period T ₁ , T ₄ , T ₇ , ..., the wrapper roll 5c is immediately lowered to the surface of the strip 2,
Each period T ₃ , which follows these periods T ₂ , T ₅ , ...
T ₅ , . . . , in most of the sections excluding the stepped portion 6, the wrapper roll 5c is pressed against the surface of the strip 2 with a predetermined pressing force. By the way, in each of the above periods T ₃ , T ₆ ,..., conventionally,
Pushing force control has been performed using a simple servo loop in which the pushing force of each wrapper roll is detected and each wrapper roll is driven so that the deviation between the detected pushing force and a set value becomes zero. However, when the pushing force is controlled by such a simple servo loop, the wrapper roll tends to resonate in the direction in which the pushing force is generated, as shown by the broken line A in Fig. 2, and as a result, stable pushing cannot be performed. There was a problem.

The invention was made in view of the above circumstances, and its object is to provide a wrapper roll control device that can stably press a wrapper roll against a strip with a predetermined pushing force. The feature of this invention is that the position change component of the wrapper roll is added as a correction signal that cancels the position change of the wrapper roll to the control loop that controls the pushing force of the wrapper roll to be equal to the set value. .

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic configuration diagram of an embodiment of the wrapper roll control device according to the present invention. Hereinafter, in this figure, the wrapper roll 5c is rotatably supported by a swing frame 7, and this swing frame 7 is rotatably supported by a support (not shown) via a shaft 8 provided at one end thereof. Supported. Further, a rod 10 of a single-sided rod type double-acting hydraulic cylinder 9 (driving means) is connected to the other end of the swing frame 7 by a pin 11, and thus the wrapper roll 5
c is driven by a hydraulic cylinder 9 and is moved approximately along the radial direction of the mandrel 4. Although not shown, the other wrapper rolls 5a, 5b, and 5d are also moved approximately in the radial direction of the mandrel 4 by a structure similar to the above structure. Next, hydraulic oil pressurized by a pump 12 is supplied to the hydraulic cylinder 9 via a servo valve 13.

In this case, the hydraulic oil pressure on the rod side and the hydraulic oil pressure on the anti-rod side of the hydraulic cylinder 9 are as follows:
The pressure sensors 14 and 15 (pushing force detection means) detect the pressure, respectively, and the pressure sensors 14 and 15 are detected by the arithmetic unit 16.
By taking the difference between the outputs, the driving pressure of the hydraulic cylinder 9, that is, the pushing force of the wrapper roll 5c is detected. On the other hand, a rotation angle detector 17 (position detection means) such as a potentiometer is mounted on the shaft 8 of the swing frame 7.
The rotation angle detector 17 detects the rotational position of the swing frame 7, that is, the position of the wrapper roll 5c along the radial direction of the mandrel 4. Further, reference numerals 18 to 20 each indicate a setting device, and the setting device 18 is used to determine the position that the wrapper roll 5c should reach when lifting the wrapper roll 5c to avoid the step 6, that is, the period shown in FIG. The position (height) that the wrapper roll 5c should reach at T ₁ , T ₄ , T ₇ , ... P ₁ , P ₂ , P ₃ ,
... is set in sequence, and the setting device 19 is a setting device in which a predetermined opening degree of the servo valve 13 required to lower the wrapper roll 5c during periods T ₃ , T ₅ , ... in FIG. 2 is set; Further, the setting device 20 is a setting device for setting a predetermined pushing force (target pushing force) of the wrapper roll 5c during periods T ₃ , T ₆ , . . . in FIG. 2. Further, the switches 21 to 23 are controlled to open and close by a timing control circuit (not shown).
is closed only during the periods T ₁ , T ₄ , T ₇ , . . . in FIG. 2, and the switch 22 is closed only during the periods T ₂ , T ₅ , .
The switch 23 is closed only during periods T ₃ , T ₆ , . . . in the figure. Further, a change component detector 24 extracts only the change component of the position signal output from the rotation angle detector 17, and is composed of, for example, a differential circuit.

The following explanation will proceed according to the timing shown in FIG. First, when the wrapper roll 5c reaches just before the first step 6 and period T1 begins, the switch ₂₁ is closed. Then, servo valve 13
is the position of the wrapper roll 5c and the position P ₁ set in the setting device 18 according to the output of the calculator 25.
It is controlled so that the deviation from the As a result, the wrapper roll 5c is lifted to position _P1 , thereby avoiding a collision between the wrapper roll 5c and the first step 6. Next, when the wrapper roll 5c passes directly above this first step and period T2 begins, the switch ₂₁ is opened and the switch 22 is closed in its place. Then, the servo valve 13 is controlled to have a predetermined constant opening degree set in the setting device 19. As a result, the wrapper roll 5c is immediately lowered onto the strip 2.
Next, when period T ₂ ends and period T ₃ begins, switch 22 is opened and switch 23 is closed in its place. Then, the servo valve 13 is controlled by the output of the computing unit 26. In this case, the calculator 26 has a predetermined pushing force set in the calculator 20 as the target value, the actual pushing force of the wrapper roll 5c outputted by the calculator 16 as the main feedback amount, and a change component detector. 24 outputs a position change component of the wrapper roll 5c (this position change component assumes a positive value when the position of the wrapper roll 5c changes in the direction of the mandrel 4) is supplied as a feedback amount for correction. . Therefore, in this case, the hydraulic cylinder 9 operates so that the deviation between the actual pushing force of the wrapper roll 5c and the target predetermined pushing force becomes zero, and when the position of the wrapper roll 5c is about to change, Control is performed to cancel this position change.
Thereafter, operations similar to those described above are repeated in sequence during periods T ₄ , T ₅ , T ₆ , T ₇ , . . . .

According to this embodiment, during the periods T ₃ , T ₆ , . . . shown in FIG. In addition, positional changes due to resonance etc. of the wrapper roll 5c can be almost completely suppressed, and thereby a stable pressing operation of the strip 2 can be realized.

In the above embodiment, only the control of the wrapper roll 5c has been described, but the other wrapper rolls are also controlled in the same way as shown in FIG. 3.

As is clear from the above description, according to the wrapping roll control device for a coiler according to the present invention, the position change component of the wrapping roll is added to the control loop that controls the pushing force of the wrapping roll to be equal to a set value. Since the wrapper roll is applied to the strip in such a way as to cancel it out, it is possible to press the wrapper roll against the strip in an extremely stable manner without causing resonance etc., thereby realizing stable and rapid winding of the strip and improving the winding shape of the wound strip. Problems such as defects or surface scratches can be prevented.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a down coiler, Fig. 2 is an explanatory diagram conceptually showing the control of the wrapper roll in the down coiler, and Fig. 3 is a block diagram showing the configuration of an embodiment of the present invention applied to a down coiler. be. 2...Strip, 4...Mandrel, 5a~
5d...Ratsupar roll, 9...Hydraulic cylinder (driving means), 13...Servo valve, 14, 15...
Pressure sensor (pushing force detection means), 16, 26...
Arithmetic unit, 17... Rotation angle detector (position detection means), 24... Change component detector.

Claims (1)

[Claims] 1. A wrapper roll is provided on the outer periphery of the mandrel and is moved approximately in the radial direction of the mandrel by a driving means, and the supplied strip is wound while being pressed against the mandrel by the wrapper roll driven by the driving means. In the coiler, the coiler includes a position detecting means for detecting the position of the wrapper roll along the radial direction of the mandrel, a pushing force detecting means for detecting the pushing force applied by the wrapper roll to the strip, and an output of the pushing force detecting means. a control loop for controlling the drive means so that the pushing force is equal to a set value based on the position detection means; and a control correction means for adding the amount of change in the output of the position detection means to the control loop as a correction signal. A lattice roll control device for a coiler characterized by: