JPH04209882A - Method for controlling pulp concentration in pulper and pulp concentration controlling apparatus - Google Patents

Abstract

PURPOSE:To control pulp concentration at a low cost without using large-sized apparatus by detecting the load on a stirring means for mixing dilution water and raw pulp supplied to a pulper, and controlling the supply of the pulp and water according to the detected value. CONSTITUTION:Sheet pulp 7 supplied to a pulper 1 with a pulp-charging conveyor 6 is mixed with dilution water 20 supplied from a dilution water feeding pipe 9 with a pump. The mixture is stirred with a stirrer 3 and the load on the motor 5 driving the stirrer 3 is detected by a load sensor 18. The concentration of the mixed liquid is maintained to the optimum level by controlling the driving of the conveyor-driving motor 19 and a pump 8 to start or stop the supply of the raw sheet pulp 7 and the dilution water according to the detected value. The pulp concentration in the pulper 1 can be controlled by this process.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for controlling pulp concentration when mixing raw material pulp and water using a pulper, and an apparatus for implementing this method.

[Conventional technology]

Traditionally, raw material pulp such as sheet pulp in the pulp preparation process is generally disintegrated using a pulper equipped with an agitator at the bottom of a tank and a device that stocks various types of sheet pulp by type. This method was carried out by feeding this sorted pulp and dilution water into a pulper so that the concentration corresponded to the recycled pulp as a product, and stirring them to dissolve the note pulp in the dilution water1. In this case, the concentration of the mixed solution can be adjusted by manually feeding sheet pulp into the pulper in a weight corresponding to the amount of dilution water supplied, or by providing a means for feeding sheet pulp into the pulper and using a timer to control the feeding. This was done at regular intervals, or by setting the concentration of the mixed solution high in advance and adding dilution water to it.

[Problem to be solved by the invention]

However, these methods require equipment to stock sort valves by type, resulting in high equipment costs.
At the same time, there was a problem in that the equipment became larger and maintenance costs increased. Therefore, the technical problem to be solved by the present invention is to prevent the device from increasing in size even when using a wide variety of raw material pulps, and to be able to adjust the concentration of the 9-mixture to a desired value. .

[Means to solve the problem]

In order to solve the above-mentioned technical problem, in the valve concentration control method in a pulper according to the present invention, the load on the stirring means for mixing the raw material valve and dilution water supplied into the pulper is detected, and the load is adjusted according to the detected value. By controlling the supply or stopping of the raw material pulp and dilution water into the pulper, the concentration of the mixed liquid is adjusted to an appropriate value. The equipment for carrying out this method includes a pulper consisting of a tank and stirring means for mixing the raw material pulp and dilution water, a raw material valve supply means for supplying the raw material pulp to the pulper, and a diluent to the pulper. It is equipped with a dilution water supply means for supplying water, and further includes a detection means for detecting the load on the stirring means during stirring, and a raw material valve that adjusts the concentration of the mixed liquid to an appropriate value according to the output signal of this detection means. It is sufficient to provide a control means for controlling the supply of raw material pulp by the supply means and the supply of dilution water by the dilution water supply means.

[Action/effect]

In this configuration, the detection means detects the load on the stirring means that varies depending on the valve concentration of the mixed liquid, and the control means controls the supply or stop of the raw material pulp and dilution water based on the detected value. ), the mixed liquid can always be adjusted to an appropriate concentration by the control means, without having to stock the raw material pulp by type and, for example, adjust its supply timing. There are no problems such as an increase in the size of the amplifier or a cost amplifier.

【Example】

Below, one embodiment of the present invention shown in FIG. 1 will be described in detail. In the figure, 1 is a pulper consisting of a roughly cylindrical tank 2 and an agitator 3 provided at the bottom thereof. The stirrer 3 is connected to a drive motor 5 via a belt transmission mechanism 4 . Further, above the pulper 1, an input conveyor 6 for a sheet valve 7 is provided as a means for supplying raw material pulp, and a pump 8 as a means for supplying dilution water supplies dilution water 20 from a water source (not shown). A pipe 9 is provided, and a seat valve 7 and dilution water 20 are installed in the pulper 1.
is now available. In addition, a discharge pipe 10 is provided at the bottom of the pulper 1 in order to send the mixed liquid of the note valve 7 supplied into the pulper 1 and mixed by the stirrer 3 to the next process. To,
Two valves 11 and 13 and a pump 12 are provided. In order to return the liquid mixture passing through the pipe 10 into the pulper 1 as needed, a switching valve 14 and a circulation pipe 15 are provided downstream of the valve 13. The pulper I is equipped with a water level detector 16 for detecting the internal water level and controlling the supply amount of dilution water 20 according to the water level.
is attached to the dilution water 2° supply pipe 9, and the dilution water 20° is supplied in response to the signal from this water level detector 16.
A valve 17 is provided for adjusting the flow rate. Further, a load sensor 18 is connected as a detection means to the drive motor 5 of the agitator 3, which detects the load of the drive motor 5 (which changes depending on the concentration of the mixed liquid) from the current value, and its output signal is The drive motor 19 of the input conveyor 6 is electrically connected via a load sensor 18 or other control means (not shown) so that the input conveyor 6 supplies the seat valves 7 accordingly. This funnel sensor 18 can directly detect the current value according to the concentration of the mixed liquid in the pulper 1. Therefore, in this configuration, the load on the drive motor 5 for stirring the liquid mixture is detected by the load sensor 18, and as a result,
When it is detected that the valve concentration is lower than the set value due to a small load, the control means sends an input signal for the seat valve 7 to the input conveyor 6, and the sorting valve 7 is automatically input into the pulper 1. Ru. Conversely, if it is detected that the load on the drive motor 5 is large, the valve concentration is higher than the set value, so the seat valve 7 is not closed. Furthermore, when the load sensor 18 detects that the load on the drive motor 5 is large, and when the water level detector 16 detects that the water level is below a certain value,
The valve 17 is opened and the dilution water 20 is supplied into the pulper 1, and when the water level is above a certain value, the valve 17 is closed and the dilution water 20 is not supplied into the pulper 1. Not possible. In this way, with the above configuration, it is possible to reliably adjust the concentration of the mixed liquid to the desired value even if a wide variety of note valves are supplied at random without providing a device to stock sort valves for each type. Therefore, problems such as an increase in the size of the device and high cost do not occur. Further, a mixed solution having a desired constant concentration can be continuously and efficiently taken out. for example,
The inner diameter of the pulper is about 3 m, the height is about 2 m, and ll0k.
In this case, when using a W drive motor, it is not possible to use a timer to control the injection timing of the note valve.
Whereas 11,900 kg of sort valves were disintegrated in 7 hours of operation per day, with the configuration of this example, it took only 467 hours to process the same amount of raw pulp. We were able to shorten the time by approximately two-thirds. Therefore, the working time of the worker can be shortened, and the operating time of the device can be shortened, resulting in a significant reduction in power consumption. In this embodiment, for example, if a trouble occurs in the process after disintegration of the raw material valve, the switching valve 14 is switched to return the discharged liquid from the pipe 10 to the pulper 1, and at the same time, the water and sorted pulp are removed. By interrupting the supply, restoration work can be carried out smoothly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus for carrying out a valve concentration control method according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Pulper, 2. Tank, 3... Stirrer (stirring means), 4 Belt transmission mechanism, End... Drive motor, 6... Seat valve input conveyor (raw material valve supply means), 7.
... Seat valve, 8... Pump (dilution water supply means)
, 9 dilution water supply pipe, 10... discharge pipe, 11.
13... Valve, 12... Pump, 14... Switching valve, 15... Circulation pipe, 16... Water level detector, 17... Flow rate adjustment valve, I8... Roto sensor (
detection means), 19 ・Conveyor drive motor, 20...
Dilution water patent Applicant Kao Corporation agent Patent attorney Aobai Ao (and 1 other person) Figure 1

Claims (2)

[Claims] (1) The load on the stirring means for mixing the raw material pulp and dilution water supplied into the pulper is detected, and the supply or stop of each of the raw material pulp and dilution water is controlled according to the detected value, and the mixed liquid is A pulp density control method in a pulper, which comprises adjusting the density to a proper value. (2) A pulper composed of a tank and a stirring means for mixing raw material pulp and dilution water, a raw material pulp supply means for supplying raw material pulp to the pulper, and a dilution water supplying dilution water to the pulper. a supplying means, further comprising a detection means for detecting the load on the stirring means during stirring, and a raw material pulp supplying means for controlling the concentration of the mixed liquid to an appropriate value according to the output signal of the detection means. 1. A pulp concentration control device comprising a control means for controlling the supply of raw material pulp by the dilution water supply means and the supply of dilution water by the dilution water supply means.