JPH07102922B2 - Web take-up device - Google Patents

Description

The present invention relates to a web winding device generally used in a paper mill.

(Prior Art) A web winding device (hereinafter referred to as a winder) generally used in a paper mill will be described with reference to FIG.
The paper 02 fed from the rewinding roll 01 is cut into a required width by a slitter 04 via a paper roll 03, and then wound up to a predetermined length on a pair of winding drums 05 and 06 and wound up. Form roll 07.

The conventional winder operation state will be described below. FIG. 4 shows the relationship between the winder winding speed and the operating time. First, the acceleration operation 10 was performed from the operation start point 08 with the acceleration rate 09, and the winding speed reached the constant winding speed 12 specified in the paper mill within the range of the maximum winding speed 11 or less in the machine specifications. From point 13, constant speed operation 14 at the same speed 12 is performed, and finally deceleration operation 18 is performed at deceleration operation start point 17 which is calculated back from the take-up length 15 and deceleration rate 16 specified in the paper mill. One cycle of operation ends at 19. Then, the following operation is repeated after an arbitrary winding roll unloading time 20 has passed.

That is, the winding speed 12 in the constant speed operation area 14 is fixed at the paper mill, and the winding drum 0 in this area is
The number of revolutions of 5,06, paper roll 03, etc. is constant, but in the rewinding roll 01 and the take-up roll 07, as one of the diameters of the rewinding roll 01 and the take-up roll 07 becomes thinner, the other becomes thicker, so that the rotations thereof are successively performed. The numbers are changing. Therefore, especially due to the relationship between the rotational speed and the natural frequency of each part of the winder, vibration may occur in each part that should be a problem in winder performance, but effective means for reducing this vibration is adopted. The current situation is that there are none.

(Problems to be Solved by the Invention) When the above-described vibrations are generated in the respective portions during the winding of the web, various problems as described below occur.

(1) The vibration causes the web to tear.

(2) The life of the slitter blade is reduced.

(3) The winding end surface of the winding roll becomes uneven.

(4) Since the winding is not reliably performed, the structure of the winding roll deteriorates.

The present invention has been made in order to solve these problems and to eliminate the above-mentioned vibration that causes the problems.

(Means for Solving the Problems) Therefore, in the web winding device according to the present invention, a vibration amplitude detecting device installed in each part of the web winding device, a detection value thereof, and a vibration amplitude allowance preset. It is configured to include a comparison device that compares the value and a control device that automatically controls the winding speed of the winding device based on the comparison result of the comparison device, and this is a means for solving the above problems. is there.

(Operation) By controlling the winding speed during operation of the winder, it is possible to avoid resonance vibration that occurs based on the relationship between the natural frequency of each part of the winder and the number of rotations of each rotating body of the winder, and to prevent Vibration can be reduced.

(Embodiment) The present invention relates to the constant speed operation region 14 shown in FIG. 4, and its embodiment will be described below. In FIG. 1, the vibration detection attached to each place 1 of the winder is detected. The vibration amplitude value detected by the container 2 is converted into an electric signal 3 and input to the winding speed control board 4. In this control panel, for example, according to the flow chart shown in FIG. 2, it is judged whether there is acceleration, deceleration, or speed change with respect to the winding speed. By sending the control signal 5 corresponding to this determination to the drive motor 6, the rotation speed of each rotating body 7 is automatically controlled, and the vibration amplitude of each part of the winder can be suppressed to the allowable value or less during its operation.

An example of the winding speed control of the present invention will be briefly described below with reference to the flowchart of FIG.

As described above, the control of the winding speed by the device of the present invention is intended for the constant speed operation of FIG. 4, and the vibration amplitude detection value detected by each part while the winding operation is performed at the constant speed. A _m
There is a preset vibration amplitude allowance A _p between smaller is sustained operation remain constant speed, if the detected value A _m is equal to or detected value it more as large as the allowable value A _p is the same The operating speed is increased until it is within the allowable value A _p . While this control is being performed, the actual winding length L'is detected at the same time, and the same length L'finally starts to decelerate from the winding length L to be wound up until it stops. The winding speed is controlled to eliminate the above vibration while the winding length is smaller than the value obtained by subtracting the winding length, and whether the current winding speed V is higher than the maximum winding speed V _{m according} to the machine specifications. If V ≧ V _m , the winding speed control based on the above vibration amplitude is continued as long as the vibration amplitude value does not exceed the allowable value while controlling to decelerate. If V <V _m , the vibration amplitude detection value A _m at the same time point is further compared with the vibration amplitude detection value A _m ′ after a predetermined time, and if A _m ′ ≧ A, the speed is decelerated and A _m ′. <When A, again
A _m and A _p are compared to determine whether to maintain constant speed or accelerate.

The control system shown in FIG. 2 shows one control example of the winding speed control of the present invention, and in reality, there are various types such as simpler or more complicated than that shown in FIG. Various control methods are possible.

(Effects of the Invention) As described in detail above, according to the web winding device according to the present invention, it is possible to automatically avoid excessive vibration that occurs during operation, such as paper breaks and winding defects. It is possible to solve various problems caused by vibration of each part during winding.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a winding speed control device as one embodiment of the present invention, FIG. 2 is a typical control flow chart applied to the present invention, and FIG. 3 is a general web winding device. FIG. 4 is an operation pattern diagram in the conventional web winding device. Description of main parts of the figure 2 ... Vibration detector 4 ... Winding control panel 6 ... Drive motor 7 ... Rotating body

Claims (1)

[Claims] 1. A vibration amplitude detecting device installed in each part of a web winding device, a comparing device for comparing the detected value with a preset vibration amplitude allowable value, and based on a comparison result of the comparing device. A web winding device, comprising: a control device that automatically controls a winding speed of the winding device.