JPS60262766A - Taking-up driving apparatus of slitter - Google Patents

Abstract

PURPOSE:To permit the taking-up with a uniform taking-up tension by constituting a vector control inverter installed for each taking-up shaft driven by an induction motor so that the mechanical loss and/or inertia of a taking-up shaft driving system can be memorized. CONSTITUTION:Each sheet material cut into band form having a small width in a slitter is taken-up onto a taking-up shaft 10. Said taking-up shaft 10 is revolution-driven by an induction motor 12 through a taking-up shaft driving system 11. Each motor 12 is controlled by a CPU through a vector-control inverter 14 installed on each shaft 10. In this case, the output torque control by a vector control inverter 13 is feedback-controlled on the basis of the output of a speed detector 15. Each inverter 13 is equipped with memory and calculation parts, and the characteristics such as mechanical loss and inertia of the taking-up shaft driving system 11 ranging from each motor 12 to the taking-up shaft 10 are memorized, and the correction on the basis of the mechanical loss and the inertia can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a winding drive device for a slitter, and in particular to a winding drive device for a slitter, in particular a winding drive device for each winding shaft that winds a plurality of slit belt-like sheet materials, such as plastic films, sheets, paper, etc. The present invention relates to a winding drive device for a slitter, each of which has a winding drive source.

Prior Art In recent years, in slitters that slit and wind sheet-like materials into multiple strips, precise control of winding tension or winding torque has become necessary due to increasingly sophisticated quality requirements for the product rolls being wound. The so-called □ individual drive system, which has a winding drive source for each winding shaft, is becoming mainstream.

Through this individual drive, improvements in the winding appearance of product rolls and faster winding speeds are being achieved. As the winding drive source in each individual drive system, a highly accurate motor such as a DC motor is usually used when precise control of winding tension or winding torque is required.

In this individual drive system, in order to accurately wind the belt-like sheet material to be wound with the desired tension, it is necessary to detect the winding tension actually occurring and feed back the signal while outputting the output of each winding drive source. It is most desirable to control

However, in reality, it is often difficult to detect the winding tension during winding due to space limitations in the winding section, cost, and the like. Therefore, in most slitter,
The output torque of the winding drive source must be controlled in an open loop.

In the case of open-loop control, the output torque of the motor as the winding drive source is the mechanical loss of the winding tension valve and winding shaft drive system applied to the sheet material, as well as the mechanical loss of the winding product roll and winding shaft drive. Used for the inertia valve of the system. In other words, the motor output torque is equal to the tension of the sheet-like material, the mechanical loss, and the inertia. Therefore, in open loop control,
In order to control each sheet material to a predetermined winding tension value,
It is necessary to control the motor output torque including the inertia valve to account for the mechanical loss.

In conventional open-loop control, as shown in Fig. 4, the central processing unit 1 calculates mechanical loss and inertia valves for all slitter machines, and each motor control panel 2
The output torque of each motor 3 as a winding drive source is compensated for through the motor 3. Although it was possible to calculate the inertia of each product roll for each winding axis by inputting the rate of change in slitting speed, the length of the rolled product, the winding diameter of the rolled product, etc., it varied for each winding axis. It has been difficult to compensate for the mechanical loss and inertia of the winding shaft drive system, which has several elements, for each winding shaft. Therefore, when compensating for these,
This means compensating for the average value of each winding shaft, and if there is actual variation in mechanical loss among the winding shafts, that variation will become a variation in the winding tension, so all the winding tensions will be compensated for. A problem arises in that it becomes difficult to wind the product roll uniformly and in a good shape. Moreover, the mechanical loss changes over time, and there is a problem in that it needs to be measured periodically and corrected from time to time.

Purpose of the Invention In order to solve the above-mentioned problems, the present invention provides a slitter that uses an individual drive system and is controlled in an open loop.
It is an object of the present invention to provide a winding drive device that can accurately compensate for mechanical loss and inertia of a winding shaft drive system for each winding shaft.

Composition of the Invention The slitter winding drive device of the present invention, which meets this objective, has a plurality of slit strip sheets 1 to 1, which are wound on each winding shaft by a winding drive source. In the winding drive device, the winding drive source is composed of an induction motor, and a vector control inverter for controlling the output of the induction motor is provided for each winding shaft, and the vector control inverter is connected to the winding shaft. The device is characterized in that it is configured to be able to store either the mechanical loss of the drive system or both the mechanical loss and inertia.

Effect of the Invention In the slitter winding drive device configured as described above, the mechanical loss and inertia of each winding shaft drive system are stored as individual characteristics in the vector control inverter provided for each winding shaft. Ru. For example, by increasing and decelerating each winding shaft in idle operation, the mechanical loss of the winding shaft drive system corresponding to each speed and the inertia corresponding to each speed change rate are Automatically memorized through learning. Since the mechanical losses and inertia are stored as individual characteristics of each winding shaft drive, the mechanical losses and inertia at each winding shaft are compensated precisely and individually for each winding shaft. Therefore, the belt-like sheet material wound around each winding shaft is wound with an accurate predetermined winding tension even under open loop control.

Effects of the Invention Therefore, it is possible to accurately compensate for mechanical loss and inertial winding torque according to the characteristics of each winding shaft, so even if there are variations in each winding shaft, each strip sheet 1 to Winding can be performed with the desired winding tension, and even if mechanical loss changes over time, the compensation value can be automatically corrected by simply running the winding shaft idly, ensuring that the prescribed winding tension is accurately maintained. It becomes possible to slack off. As a result, all the product rolls wound around each winding shaft can be uniformly wound with a predetermined winding tension, and a good winding appearance can be obtained.

Embodiments Below, preferred embodiments of the slitter take-up drive device of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a slitter take-up drive device according to an embodiment of the present invention. In the figure, reference numeral 10 indicates each winding shaft of the slitter, and each winding shaft 10 is connected via each winding shaft drive system 11 to an induction motor 12 as a winding drive source. Each induction motor 12 is connected to a vector control inverter 13 provided for each winding shaft 1o. Each vector control inverter 13
It is connected to a central processing unit 14 which sends a signal of the winding tension or winding torque of the belt-like sheet material to be wound around each winding shaft 1o.

Each vector control inverter 13 is configured to send an output torque command signal to the corresponding induction motor 12, respectively. When controlling the output torque by this vector control inverter 13, the induction motor 1
Two speed feedback signals are required, and the signals are fed back to the vector control inverter 13 by a speed detector 15 built in or connected to each induction motor 12.

Further, each vector control inverter 13 individually stores,
It has a calculation function. The winding shaft drive system 1 extends from each induction motor 12 to each winding shaft 1o.
The mechanical loss and inertia characteristics of 1 can be stored individually.

In this embodiment, one induction motor 12 as a winding drive source is provided for each winding shaft 1o, but as shown in FIG. , 12b may be connected and driven from both sides. In this case, as shown in FIG. 3 for one winding shaft, the induction motors 12a and 12b on both sides are mechanically connected via the winding shaft 10, so the speed of both motors is always the same. Therefore, one motor is provided with a speed detector 15, and both motors 12a, 1
2b can be controlled by one vector control inverter 13.

The operation of the slitter winding drive device configured as described above will be described below.

Each winding shaft 1o has a respective induction motor 12
The output torque of each induction motor 12 is controlled by each vector control inverter 13.

When controlling this output torque, for each winding shaft 10,
Compensation for mechanical loss and inertia is performed by each vector control inverter 13 as follows.

That is, the winding shaft 10 is operated empty, and its speed is increased or decreased within the range of the actual winding speed.

At this time, the torque of the motor required to drive each winding shaft 10 is equal to the sum of the mechanical loss and inertia of the winding shaft drive system 11, since the belt-like sheet material is not applied. and,
When the idling speed is constant, there is no inertia, so the torque is only the mechanical loss, and when the speed changes, the torque becomes a value obtained by adding inertia according to the speed change rate. Therefore, the inertia can also be easily calculated by subtracting the mechanical loss from the required torque when the speed changes. Therefore, in the actual winding speed range, by appropriately making one reciprocation from the speed O to the maximum speed, it is possible to calculate the mechanical loss and inertia according to each speed and speed change rate. This calculation is performed and stored by each vector control inverter 13 for each winding shaft 10. Therefore, each winding shaft drive system 11
The mechanical loss and inertia characteristics of are easily and accurately stored in each vector controlled inverter 13.

In the vector control inverter 13, the central processing unit f
An output torque command signal is issued to each induction motor 12 based on the signal sent from f114, and at this time, the stored mechanical loss and inertia components are automatically compensated.

Therefore, each winding shaft 10 is rotationally driven according to the characteristics of the individual drive transmission system, and the belt-like sheet material to be wound is
Even if the output torque of the induction motor 12 is under open-loop control, it is accurately controlled to a predetermined winding tension.

Therefore, according to this embodiment, even if there is variation in the characteristics of each winding shaft drive system 11, it is possible to correct it and drive all the winding shafts.
0 can be rotated with a predetermined torque, and the entire belt-like sheet material wound around each winding shaft 10 can be rolled up with a predetermined winding tension. As a result, uniform and good winding appearance of all product rolls can be obtained, and the product acceptance rate can be improved.

Furthermore, even if there is a change in mechanical loss in the take-up shaft drive system 11 over time, the vector control inverter 13 can easily and automatically learn and memorize the change. Another advantage is that the winding tension can be set accurately.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a slitter take-up drive device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a slitter take-up drive device showing a modification of FIG. 1, and FIG. FIG. 2 is an enlarged partial configuration diagram of FIG. 2, and FIG. 4 is a schematic configuration diagram of each individually driven slitter using conventional open-loop control. 10... Winding shaft 11... Winding shaft drive system 12.12a, 12b... Induction motor 13... Vector control inverter 14...
・Central processing unit

Claims (1)

[Claims] (1) A take-up drive device for a slitter that winds up a plurality of slit sheet-like objects by a take-up drive source provided on each take-up shaft, wherein the take-up drive source is composed of an inductor motor; A vector control inverter that controls the output torque of the induction motor is provided for each winding shaft, and the vector control inverter can store either mechanical loss or both mechanical loss and inertia of the winding shaft drive system. A winding drive device for a slitter, characterized in that it is configured as follows.