JPH0572109A - Measuring device for slurry concentration - Google Patents

Abstract

PURPOSE:To correctly determine the concentration of slurry even in the case where foreign materials are mixed, by measuring the variation of the slurry quantity stored in a collar part on the outer periphery of the upper edge part of a container, taking account of the variation of the slurry concentration and the change of fluidity. CONSTITUTION:The slurry consisting of the paper manufacturing material and water is continuously supplied into a slurry container 2 from a feeding pipe 3, and after the overflow from a collar part 1 into a receiving tank 5, the slurry is introduced into the next process from an outlet pipe 6. The fluidity of the slurry changes according to the concentration of the raw material, and as it increases, the slurry quantity stored in the collar part 1 increases. Accordingly, though in case of the slurry consisting of only water, the measurement value of a weight meter 4 is the sum of the weight of the container 2 and the weight of the contents in the container 2, the measurement value of the weight meter 4 increases, as the concentration of the raw material increases. The concentration of the slurry is conversion-calculated from the variation of the weight. According to this method, even if a foreign material is mixed, the generation of the measurement error due to the foreign material is prevented, since a mechanical revolution part does not exist, and the slurry having a prescribed concentration of the raw material can be sent to the next process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a slurry concentration, and more particularly to an apparatus for measuring the concentration of a slurry composed of a papermaking raw material and water in a papermaking raw material adjusting step.

[0002]

2. Description of the Related Art Newspapers, magazines, cardboards, and other waste papers and pulps used as raw materials for papermaking are slurried with water by a disintegrator such as pulper fiber flow so that the ratio of the raw materials becomes 4 to 5% at maximum. After that, the material is pumped to the next process.

At this time, if the raw material concentration in the slurry becomes high, it becomes difficult to feed the liquid by the raw material pump. Therefore, conventionally, when the raw material concentration is measured and the concentration is higher than a specified value, dilution water is added. It is injected to keep the raw material concentration constant.

[0004]

However, the conventional concentration measuring device measures the raw material concentration by rotating the water turbine driven by the motor in the slurry in the container and detecting the torque of the motor which changes depending on the raw material concentration. It was a thing.

Therefore, when a foreign substance such as vinyl or a string is mixed in the slurry, the foreign substance may be entangled with the water wheel to change the resistance, which may make it impossible to accurately measure the raw material concentration, which hinders continuous operation of the apparatus. I had to come.

Therefore, an object of the present invention is to provide a slurry concentration measuring device capable of accurately measuring the slurry concentration even if foreign matter is mixed in the slurry.

[0007]

In order to achieve the above-mentioned object, a slurry concentration measuring apparatus of the present invention comprises a slurry container having a wide flange on the outer periphery of the upper edge portion, and a slurry is supplied into the slurry container. Supply pipe, a weight scale for measuring the weight of the slurry container, a receiving tank provided on the outer peripheral side of the slurry container for receiving the slurry overflowing from the outer periphery of the collar portion, and an outlet pipe for drawing out the slurry received in the receiving tank. It is characterized by having and.

[0008]

[Operation] The slurry concentration measuring device configured as described above uses the fact that the fluidity changes depending on the slurry concentration. When the raw material concentration in the slurry increases, the fluidity decreases, so the upper edge of the container It can be seen that the amount of slurry accumulated in the wide brim provided on the outer periphery increases, the weight measured by the weight scale increases, and the slurry concentration increases.
That is, it is possible to increase the amount of change in weight as compared with the case where the weight is measured by simply supplying the slurry into the container,
Accurate measurement can be performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below based on an embodiment shown in the drawings. FIG. 1 is a vertical sectional view of a slurry concentration measuring device, and FIG. 2 is a system diagram showing an example of use of the measuring device.

The slurry concentration measuring device measures the weight of the slurry container 2, a slurry container 2 having a wide collar 1 on the outer periphery of the upper edge, a supply pipe 3 for supplying the slurry into the slurry container 2, and the slurry container 2. A weighing scale 4, a receiving tank 5 provided on the outer peripheral side of the slurry container 2 for receiving the slurry overflowing from the outer periphery of the collar portion 1, and an outlet pipe 6 for discharging the slurry received by the receiving tank 5 are mounted on a pedestal 7. Supported.

The slurry container 2 is suspended on the weight scale 4 via a wire 8, and the weight of the slurry supplied from the supply pipe 3 into the container 2 is continuously measured by the weight scale 4. It

A return pipe portion 3a is provided at the tip of the supply pipe 3 so that the slurry supplied from the supply pipe 3 is introduced into the container as an ascending flow so that the slurry flow is at the bottom of the container. This prevents the weight from changing due to the pressure applied to it.

A slurry composed of a papermaking raw material and water is continuously supplied from a supply pipe 3 into a slurry container 2 and a collar portion 1
After being spilled into the receiving tank 5, it is led out from the outlet pipe 6. At this time, the fluidity of the slurry changes according to the raw material concentration in the slurry. If the raw material concentration is low, the fluidity increases, and as the raw material concentration increases, the fluidity decreases. As a result, the amount of slurry accumulated on the collar portion 1 changes.

For example, in the case of only water, since it hardly accumulates on the collar portion 1, the measured value of the weight scale 4 is the sum of the weight of the slurry container 2 and the weight of water in the container, As the raw material concentration increases and the fluidity decreases, the amount accumulated on the collar portion 1 increases, and the measured value of the weight scale 4 increases. Table 1 shows the results of measuring the weight change with respect to the raw material concentration, and it can be seen that the weight change is larger than the weight change due to the change in specific gravity.

[0015]

[Table 1]

The above measuring device is used as shown in FIG. FIG. 2 shows an apparatus for continuously fluidizing and supplying used paper such as newspapers, magazines, and corrugated cardboard. The used paper as a raw material is conveyed by a belt conveyor 11 and put into the pulper 12 to adjust the amount of the used paper. Depending on the maximum raw material concentration 4 ~
Injecting 5% of water into the pulper 12 through the pipe 13 and stirring and mixing to fluidize the fluidized material, and the fluidized material is fed from the raw material pump P to the next process through the liquid feeding pipe 14. It is configured.

In FIG. 2, in the measuring device S, the supply pipe 3 is connected to the pipes 15 and 16 branched from the liquid supply pipe 14, and the tip of the outlet pipe 6 is opened in the pulper 12. The amount of the raw material slurry supplied to the measuring device S can be adjusted by appropriately adjusting the opening degree of the valve provided in each part based on the instruction of the pressure gauge PI provided in the supply pipe 3.

The measured value of the weighing scale 4 of the measuring device S is
It is input to the controller C. This controller C is a weight scale 4
The flow control valve V provided in the dilution water supply pipe 17 is controlled to open and close according to the measured value of 1. When the raw material concentration in the measuring device S exceeds the specified value, the flow control valve V is operated in the opening direction.

When the belt conveyor 11, the pulper 12, the raw material pump P and the like are operated, a part of the raw material slurry supplied from the liquid feeding pipe 14 is supplied to the measuring device S at a constant pressure, and the slurry pipe is supplied from the supply pipe 3. After flowing into the inside 2, it overflows from the collar 1 to the receiving tank 5 and is returned to the pulper 12 from the outlet pipe 6.

Then, the measured value of the weighing scale 4 is input to the controller C, and the controller C opens and closes the flow control valve V as necessary, and supplies it from the dilution water supply pipe 17 to the suction side of the raw material pump P. The amount of dilution water to be adjusted is adjusted to maintain the raw material concentration within a predetermined range.

Further, even if a foreign matter is mixed in the raw material slurry, there is no mechanical rotating part unlike the conventional water turbine, and therefore, a measurement error due to the foreign matter hardly occurs. Therefore, the raw material concentration can be always measured accurately, and the slurry having a predetermined raw material concentration can be sent to the next step.

Further, based on the measured value of the weight scale 4, that is, the raw material concentration measured by the measuring device S, the amount of used paper supplied from the belt conveyor 11 and the amount of water from the pipe 13 are controlled. As a result, automatic operation can be performed, and quality can be improved and labor can be saved.

The slurry concentration measuring apparatus of the present invention can be used in other than the paper manufacturing process.

[0024]

As described above, the slurry concentration measuring device of the present invention supplies the slurry into a slurry container having a wide flange on the outer periphery of the upper edge and measures the weight to measure the concentration of the slurry. Since the measurement is performed, an accurate concentration can be measured even if foreign matter is mixed. In particular, since the container is provided with the wide collar portion, the weight change can be increased and the weighing can be performed, so that a more accurate measured value can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a measuring apparatus showing an embodiment of the present invention.

FIG. 2 is a system diagram showing an example of use of the measuring device.

[Explanation of symbols]

1 ... Collar part 2 ... Slurry container 3 ... Supply pipe 4 ...
Weight scale 5 ... Receiving tank 6 ... Outlet pipe 11 ... Belt conveyor 12 ... Pulper 14 ... Liquid delivery pipe
17 ... Diluting water supply pipe C ... Controller P ... Raw material pump S ... Measuring device V ... Flow control valve

Claims (1)

[Claims] 1. A slurry container having a wide flange on the outer periphery of the upper edge, a supply pipe for supplying the slurry into the slurry container, a weight scale for measuring the weight of the slurry container, and an outer peripheral side of the slurry container. An apparatus for measuring a slurry concentration, comprising: a receiving tank that is provided to receive the slurry overflowing from the outer periphery of the collar portion; and an outlet pipe that guides the slurry received into the receiving tank.