JPS5915593A - Pulper drive apparatus of papermaking machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to an improved pulper drive in a paper machine.

(I)) Description of the Prior Art In paper machines, a pulper, which is a device that beats paper and sends it back to the raw material process, is installed between the dryer parts and at the bottom between the reel parts. Next 2
It plays one role.

(a) During normal operation, the waste paper generated by the one-edge pick-up section that removes both ends of the paper in front of the reel part in order to make the winding width the finished width is constantly beaten and sent back to the raw material process.

(b) When paper breaks in the dryer part or calendar/reel heart during operation, all of the paper that is continuously made becomes waste paper and is sent to the pulper for beating (7) and sent back to the raw material process.

For this reason, the pulper drive device is designed to be able to handle the paper sufficiently even when the paper is cut.

Conventionally, the following types of AC motors have been used for the pulper drive motor that constitutes the above-mentioned pulper drive device: (a) All general-purpose motors are used to perform continuous operation regardless of whether there is a paper break or not. .

(b) Applying a high startup frequency motor to start when paper breaks,
In order to be able to start up the next time even after paper waste is removed, the motor is operated for a certain period of time until the temperature drops and then stopped.

(c) Construct a system that uses a wire-wound motor and takes startup frequency into consideration.

1 with the pulper at the bottom of the cut calendar reel part:
In any of the cases described in section 1-1, the work of beating the waste paper by removing the edges is always performed, so the processing capacity (maximum rotation) at the time of paper breakage is
It is constantly being processed.

FIG. 1 shows this conventional pulper drive device, where 1 is a paper machine dryer part, 2 is a calender part, and 3 is a reel part, and the paper passes in the order of 1 → 2 → 3 (2 is wound up, During normal operation, the waste paper that has been removed by the removal section 4 between the calendar and reel falls onto the pulper 5 at the bottom of the calendar and reel parts. It is constantly operated by inputting the paper.This operation (ri) is performed using a driving force that can handle even if the entire rlJ worth of paper is wasted during paper breakage, so there is a lot of wasted energy consumption1. On the other hand, the drive motor 9 of the dryer lower pulper 8 is turned on and off by the switch 10, but is stopped F during normal operation.When a paper break occurs at the dryer outlet, the paper breakage is detected. This is detected by the switch 11, and based on this signal, the switch 100 on/off signal is configured in the resistance circuit section 12.

Considering the example in which the drive motor 9 is applied with the W mode (high startup frequency) in the same figure, when the paper breaks, all [1 piece of silk paper is generated, so the drive motor 9 is started, and then the paper is fed. The 7-ken circuit 12 is configured so that the punch can be started again later, after operating for a certain period of time until the mortar temperature drops, and then stopped.

For this reason, in conventional devices (d, (a)
Although less than 1/10 of the capacity is normally required, processing is performed at an excessive capacity in consideration of paper breakage, resulting in wasteful energy consumption.

(b) Apart from the above, even when a wire-wound morph is used, maintenance and inspection of brushes and slip rings are required, so it is not possible to perform a pT under a bad environment such as a pulper.

There was a problem.

(C) Purpose of the Invention The present invention has been made in view of the above reasons, and is aimed at improving pulper quality 1 (
It is an object of the present invention to provide a pulper drive device which is capable of efficient and energy-saving operation and is free from the above-mentioned drawbacks. By combining the installed speed per second detector and paper break detector, a circuit that calculates an appropriate pulper rotation speed from the output signals of these detectors, and the pulper drive motor and variable speed drive device, the paper machine can During normal operation, the arithmetic circuit No. 8 operates at low speed, and during paper breakage, the machine operates at high speed to achieve economical operation.

(e) Practical Example of the Invention Figure 2 shows an embodiment of the invention, in which during normal operation, H'r
The H paper detectors 1.1, 13, 1.4 are in an inoperative state, the switches 1.5, 16id are opened, the drive motor 9 is in a stopped state, while the interrupter 17 is closed, The drive motor 6I is operated by a variable speed drive device 18. The speed command to the variable speed drive device 18 is calculated and given by the rotation speed calculation circuit 20 from the signal of the paper break detector 11° 13.14 and the speed per second detector 19. ．． and 13 operate, that is, when the paper breaks immediately after the dryer, the April paper falls to the lower pulper 8 of the dryer. is opened, the switch 15 is closed, the drive motor 6 is stopped, and the drive motor 9 is driven. The speed command at this time is similarly calculated and given by the rotational speed calculation circuit 20.

After this, when the normal operating state returns, that is, when the paper break detectors 11, 1.3.14 are activated, the drive motor 9 is kept running for several minutes until the remaining horizontal paper processing is completed. It is necessary. For this purpose, the switch 15 is opened and the switch 16 is closed to switch to the applicable operation and the drive motor 9 is operated, and after a few minutes, the switch 16 is opened by a timer to stop the drive motor 9. On the other hand, when the normal operation returns, the switch 17 is closed again, and the drive motor 6 is operated by the variable speed drive device 18 for the waste paper in the selvedge section.

``Also, only the paper break detector 13 operates, and the paper break detector 11゜1
4 is inoperative, that is, the calendar exit (and paper breakage)
7, the switches 15 and 16 are opened and the switches 17 are closed, and the drive motor 6 is operated by the variable speed drive device 18, as in normal operation. However, in the rotational speed III function kugi mekugi circuit, a speed command corresponding to the total processing capacity of 1 minute is calculated. After this, when normal operation returns, that is, when the paper break detectors 11, 13. However, at the same time as the timer signal is cut off, the rotation 1/13 degree circuit 20 calculates a speed command according to the processing capacity for the ear cut, and the rotation speed t of the drive motor 6 is increased. lower.

J..., at the time of paper breakage before the dryer, that is, paper breakage t1
When all of the output devices 11, 1.3, and 14 are operating, it is not necessary to drive both the l/ryard part pulper and the calender/reel lower pulper, so the switches 15, 1, 6, and 17 are All are open.

Next, the rotation speed calculation circuit 20 will be explained in detail.

That is, the machine speed detected by the second speed detector 19 is expressed as
/min'), the rotational speed Nl of the pulper for processing the horizontal paper for trimming, and the rotational speed N2 of the pulper for processing the total [13 minutes of waste paper] are N + ""
It can be given as a function of speed per second, such as f(x) + Nt-g(x). Article f1 that determines this function
In addition to the speed per second, there are mechanical conditions such as understanding, paper rlj, ears, etc., and the processing conditions of the pulper itself, and the constants will change depending on these, but here we will assume the following for the near future: N1=k,z/aX, N2
= k2 Jb X (!4, kl+ a+ ki+
Let b be a constant given by the precept theta for each machine.

The rotation speed calculation circuit 20 includes the two types of function calculation circuits described above.

FIG. 3 shows the configuration of this rotational speed calculation circuit 20,
21 is a logical operation section, 22 is a function operation section, 23 is a rotation speed command value, 11. ．． 13.14 Based on the signals from each paper break detector, the logical operation unit 21 determines the operating state, that is, normal operation.
Each state of paper breakage is cut by 'l'+1 before the dryer, and the functions to be applied are made to correspond.

In this example, Si1, during normal operation...N-NA When the paper breaks immediately after the dryer...N=NB When the paper breaks at the outlet of the calendar...N-NB When the paper breaks before the dryer...N =0. Therefore, for this sought relationship, a.

The rotational speed command value 23 is determined from the constants b, 2, 2, and the papermaking speed X from the papermaking speed detector 19.

(f) Comprehensive Description As stated in Section 2, the present invention provides an economical device for driving a pulper in a suitably rigid manner, compared to conventional devices driven in excessive parlors. A large energy saving effect can be achieved by applying a general-purpose device that provides the following benefits and is maintenance-free.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional pulper driving device, and Fig. 2 is an illustration of an embodiment of the present invention. )ls 1kI
Figure 3 is a block diagram showing the configuration of the arithmetic circuit unit for rotation 4.
・Reel part 4...Calendar ・Reel listening part 5...Force 1/under ・Reel lower part, ζru/C-6, 9・
- Drive motor 7.10, 1.5, 16.17... Switch 8... Dryer lower halber 1, 1, 13, 14... Paper break detector 12...
sequence circuit 18...variable speed drive device 19...
Machine speed detector 20...rotational speed calculation circuit section 21.
...Logic operation part q 22...Function calculation part 23...Rotation speed command value (7317) Agent Patent attorney Noriyuki Chika (
1 other person) Figure 1 Figure 2

Claims (1)

[Claims] A speed per second detector and a paper break detector provided in the paper machine, an arithmetic circuit that inputs the outputs of these detectors and calculates an appropriate rotational speed of the pulper, and drives the pulper with the output of this arithmetic circuit. A pulper drive device for a paper machine, comprising a variable speed drive device, which operates at a low speed according to an output signal of the arithmetic circuit during normal operation of the paper machine, and operates at a high speed when paper breaks.