JPH03128433A - Specific gravity measuring instrument and liquid adjusting system using same instrument - Google Patents

Abstract

PURPOSE:To accurately measure the specific gravity of a liquid material over a wide range by placing all of the load, placed on a metering tank, on a stain gauge. CONSTITUTION:Flexible tubes 2 are connected to the top and bottom of the metering tank 1 through flanges, their one-end sides are connected to fixed tubes fixed to a frame 9, and valves 4 are connected according to the purpose of use. Further, the top of the metering tank 1 is fitted to the load side of the strain gauge 5 through a universal bolt 6 and the fixation side of the gauge 5 is fitted to support 7 fixed to the frame 9. Consequently, all of the load on the metering tank 1 is placed on the gauge 5. Further, a digital temperature indicator 11 and a digital specific gravity indicator 12 are provided. Thus, the specific gravity of the liquid material can easily and accurately be measured over a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a specific gravity measuring device and a liquid preparation system using the same. The present invention relates to a specific gravity measuring device that can accurately measure the specific weight of a liquid substance over a wide range, and a liquid preparation system that incorporates this specific gravity I measuring device and can operate online.

[Prior Art] Glass float-type hydrometers have been known as the most commonly used hydrometers.

This type of glass float type hydrometer has a relatively simple construction and is conveniently used as a fairly accurate standard hydrometer. However, it has several drawbacks such as its use is limited to individual measurements, continuous detection is not possible, and its mechanical strength is low.

Also, commonly known industrial hydrometers include vibration type hydrometers and gamma ray type hydrometers, but each of these has its own drawbacks. That is,
Regarding the former, due to restrictions on the materials that make up the material, it is not possible to measure the specific gravity of a highly corrosive substance. Since it has been
There are severe restrictions on its handling, and it is also expensive.

The specific gravity measurement accuracy of the above-mentioned hydrometer is not very high, and has an error of about 0.5% with respect to the maximum measured value. A single-tube density meter is also known, but this also has drawbacks such as poor measurement accuracy and limited measurement range.

Furthermore, it is currently impossible to find a practical slurry concentration meter on the market that can be used industrially. The purpose of this study is to estimate the slurry concentration as follows.

[Problem to be solved by the invention] As mentioned above, although vibrating hydrometers, gamma ray hydrometers, etc. have been used for a long time, the former has limitations on the materials that make it up. For this reason, it is impossible to measure the specific gravity of a highly corrosive substance to be measured, and the latter is difficult to handle because radioactive substances are used. There are other problems, such as severe restrictions, high cost, and low measurement accuracy. In addition, there is a problem that there is no so-called slurry concentration meter that is highly practical and is not suitable for on-line measurement.

This invention was made in order to solve the above-mentioned problems, and the restrictions on handling are not so severe, sufficient measurement accuracy is maintained, and individual measurements are possible. The object of the present invention is to obtain a specific weight measurement device that is fully applicable to online measurement, and a liquid preparation system using the same.

[Means for Solving the Problems] A specific weight measuring device according to the present invention includes: a strain gauge attached to a support fixed within a predetermined frame; a measuring tank in which the measuring tank is measured; a flexible tube attached to an inlet and an outlet of the measuring tank via flanges attached to each; and a predetermined valve corresponding to each flexible tube is provided. and a fixed duplex configured such that the entire load on the measuring tank is applied to the strain gauge.

In addition, the liquid preparation system of the present invention includes: a supply pipe for the raw f1 liquid, a supply pipe for the diluted liquid; a specific weight adjustment tank with a stirrer to which the raw material liquid and the diluted liquid are supplied to obtain a desired AH liquid; A specific weight measurement device attached via a branch pipe connected to the circulation pipe for the weight adjustment tank; a return pipe configured to return to the specific weight adjustment tank via the specific weight measurement device; a specific gravity measuring device and a switching valve that defines the transfer direction of the adjusted liquid; a circulation vibrator that circulates the adjusted liquid to the specific weight adjustment tank; and a circulation vibrator that circulates the adjusted liquid to the specific weight adjustment tank; The automatic adjustment valve provided in the supply pipe for the diluent is adjusted in its opening degree by the return signal from the specific weight measuring device. is automatically controlled, or the specific weight value of the regulating liquid being circulated is continuously measured by the specific weight measuring device, and a predetermined setting is stored in advance in the specific weight measuring device. The value is compared with the measured value, and depending on the result of this comparison, the switching valve in the circulation system is automatically controlled to open or close, and the circulation of the adjustment liquid is continued or the next step of using the adjustment liquid is started. This feature is characterized in that one of the transfers is selected.

[Function 1] In the specific gravity measuring device of the present invention, the measuring tank containing the liquid substance to be measured is made of a suitable corrosion-resistant material, and the installation location of the strain gauge is appropriately selected. Since the measurement data is handled digitally, it can withstand the corrosive nature of the liquid substance used as the object to be measured, and the handling restrictions are not too severe, ensuring sufficient measurement accuracy. .

Further, the liquid preparation system of the present invention is a combination of the above-described strain gauge type specific weight measurement device and a specific gravity adjustment tank, and is provided in a diluent supply pipe for diluting the raw material liquid. Since the automatic adjustment valve is controlled by the feedback signal from the specific gravity measuring device, desired liquid preparation operations can be performed while performing complete on-line measurements.

[Embodiment Figure 1 is a schematic configuration diagram showing a first example of a specific weight measuring device according to the present invention. A specific gravimetry device of the type is shown. In this Figure 1, the measuring tank (1
) consists of a hollow container made of titanium, the diameter of which is approximately 15 cm, and the height of which is approximately 50 crn.
belongs to.

For example, the diameter of the measuring tank (1) is 1.
A 5A, JIS 10kg/cm2 standard flange is attached. And these flanges have
A flexible tube (2) made of, for example, Teflon is connected to each of them, and one end thereof is connected to a fixed tube (3) made of glass lining fixed to the frame (9).

This fixed tube (3) is equipped with a bulb (for example) made of glass lining, selected according to its intended use.
4) is connected. Appropriate process piping (not shown in FIG. 1) is connected to this valve (4). Note that the frame (9) is made of, for example, a steel plate, and its width, depth, and height are each as follows:
The lengths are approximately 60 cm, approximately 60 cm, and approximately 130 cm.

Further, on the upper part of the measuring tank (1), a strain gauge (5) having a measurement accuracy of 0.02% is attached to the load side, for example, via a swivel bolt (6) as a link mechanism.

The fixed side of the strain gauge (5) is also firmly attached via a swivel bolt (6) to a support (7) fixed to the frame (9). This ensures that the entire load of the measuring tank (1) is applied to the strain gauge (5).

The fixed tube (3) described above includes, for example,
A temperature sensor (8) made of a platinum resistance thermometer is attached. In addition, a temperature compensator (10) is provided inside the frame (9) in this strain gauge type specific weight measuring device, and furthermore, a digital temperature indicator (11) and a digital specific weight indicator (12) are provided. is the frame (9
) so that it can be read from the outside. Here, the digital specific weight indicator (12) not only digitally indicates the specific weight, but also derives a deviation signal from a predetermined setting value that is preset in this specific weight measuring device. It also has a function of determining whether or not this deviation signal is within a certain predetermined tolerance range. Thus,
According to this specific weight measuring device, it is possible to easily and accurately measure the specific weight of a certain liquid substance. A balancer (15) is provided at a suitable location near the bottom of the measuring tank (1), which functions as a braking means.

According to the above-described strain gauge type specific weight measurement device, materials for the wetted parts can be selected from a wide range of materials that can withstand the corrosivity of the object to be measured, and also have mechanical strength. It is possible to make it sufficient based on predetermined strength calculations.

FIG. 2 is a schematic configuration diagram showing a second example of the strain gauge type specific weight measuring device according to the present invention.

In FIG. 2, a coiled Teflon hollow pipe is used as the measuring tank (1). That is, the measuring tank (1) made of a Teflon hollow pipe is integrated with a vertical cylindrical stainless steel holder (13) by winding the Teflon hollow pipe in a coil shape. At both ends of this Teflon hollow pipe, for example, flanges with a diameter of 15 A and a JIS standard of 5 kg/cm' are attached, and as in the case of Fig. 1, a fixed Connected to pipe 3). Therefore, in the strain gauge type specific weight measuring device as this second example, the pipes at both ends of the measuring tank (1) connected to the fixed pipe (3) are similar to the flexible tubes in FIG. It will fulfill the tR function. A strain gauge (5) having the required measurement accuracy is attached to the lower part of this measuring tank (1) via a suitable spacer (14), and a frame (9) The strain gauge (5) is supported so that the entire load of the measuring tank (1) is applied to the strain gauge (5). Here, the frame (9) is made of a steel plate, and its width, depth, and height are approximately 45 cm, approximately 40 cm, and approximately 75 cm, respectively. The rest of the structure is the same as that shown in FIG. 1, so further explanation will be omitted.

Next, FIG. 3 shows an example in which the metering tank (1) is made of a coiled stainless steel pipe instead of the measuring tank (1) made of a Teflon hollow pipe in FIG. 2. . The major differences between the one in Fig. 3 and the one in Fig. 2 above are: First, the measuring tank (1) is made of a coiled pipe made of stainless steel #A, which is a rigid material.
and the fixed tube (3) fixed to the frame (9).
) between the Teflon flexible tube (2)
is inserted; Second, the strain gauge (5) should be installed in the same position as in the case of Fig. 1 above, in the measuring tank (1).
That is what is at the top of the list. In addition, this total IPa (
1) In addition to the titanium, stainless steel, and Teflon mentioned above, various metal materials such as Hastelloy, plastic materials such as PVC and FRP, and glass and ceramic materials are also available. Various non-metallic materials can be used, such as.

FIG. 4 is an illustrative diagram of a case where the liquid preparation system including the strain gauge type specific weight measuring device shown in FIG. 1 is incorporated into a predetermined production line. The liquid preparation system shown in Fig. 4 automates the process of adjusting the specific gravity of a target liquid in a certain production line, and also reduces the variation in the specific gravity value (L) after the adjustment. This solution preparation system uses a glass float type hydrometer to measure specific gravity.
This is significantly different from the conventional specific gravity adjustment work, which was largely dependent on human power, and this work was completely automated and unmanned, resulting in a significant labor-saving effect.

The liquid preparation system will be described in detail below. First, (30) is a specific gravity adjustment tank in which the liquid to be measured is stored, and a part of the tank (30) has a supply pipe (Ll
) and a supply pipe (L2) for a dilution liquid for specific gravity adjustment are respectively attached via predetermined automatic valves (■1) and (■2). Further, this specific gravity adjustment tank (30) is provided with a suitable stirrer (30A) to mix and stir the unadjusted specific gravity liquid and the diluted specific gravity adjustment liquid. In addition, the supply pipe for the diluent for specific gravity adjustment (
The automatic valve (V2) for L2) is of the self-regulating valve type. A liquid removal nozzle is provided at the bottom of the specific gravity adjustment tank (30), and a required circulation system is configured via a predetermined valve (3) and a pump (31). ) is continuously pumped and circulated. A part of the liquid thus pumped is used as a sample liquid from the branch pipe (L3) connected to the circulation line (L6), and is passed through the lower valve of the strain gauge type specific gravity measuring device Z (32). (V4). Then, the specific gravity M of this strain gauge type, the sample c passed through the measuring device U (32)
The liquid as i passes through the upper valve (V5) and turn pipe (L4) to the original specific gravity adjustment tank (30).
will be returned to.

By the way, this strain gauge type specific gravity measuring device (32) continuously measures the specific gravity of the sample liquid passing through the internal device, displays the corresponding value digitally, and also displays the specific gravity of the sample liquid in advance in the device. The stored target specific gravity value is compared with the actual measured value, and the deviation between the two is output as a corresponding feedback signal (DS). The automatic control valve (■2) of the diluent pipe (L2) for specific gravity adjustment receives the feedback signal (DS) from the strain gauge-type specific gravity measuring device (32) and automatically controls it. The opening degree is adjusted and the diluent for specific gravity adjustment is supplied to the specific gravity adjustment tank 30) until the target specific gravity value is reached. Next, the adjustment liquid is pumped into the specific gravity adjustment tank (30) via the automatic circulation valve (6) provided in the circulation line (L6) until reaching the target specific gravity value.
), but the specific gravity of the adjusting fluid thus circulated is continuously measured, and the target specific gravity value and the measured value are stored in advance in the strain gauge type specific weight measuring device (32). It is determined whether the measured value is within a predetermined 3γ volume range, and an electrical signal corresponding to the result of the determination is output.

Now, when it is determined that the measured value is within a certain predetermined tolerance range, the automatic circulation valve (6) is immediately and automatically closed, and at the same time, the liquid supply pipe (6) for the next step is closed. The automatic liquid feeding valve (V7) provided in Ll) is opened. In response, while the above-mentioned liquid feeding operation was being carried out, an electric signal was sent from the strain gauge type specific gravity measuring device (32) indicating that the measured specific gravity value was outside a certain tolerance range. is output, the automatic circulation valve (■6) is immediately and automatically opened in response to this, and the adjusted liquid is returned to the specific gravity adjustment tank (30), and the automatic liquid supply valve for the next step is opened. (V7) will also be closed immediately. In this way, according to the liquid preparation system described above, it is possible not only to perform a simple batch-type specific gravity adjustment operation, but also to perform continuous specific gravity adjustment work.

Table 1 shown below shows the measured values measured by the strain gauge type specific weight measuring device (32) installed in the liquid preparation system in the operation process of the liquid preparation system shown in Fig. 4 above. The results are compared with the measured values of the same liquid using a glass float hole hydrometer as a reference meter.

Table 1 Float hole hydrometer Specific gravity Ji measuring device 1.547
1.547 1.520 1.520 1.543 1.543 1.546 1.547 1.548 1.548 1.553 1.553 1.546 1.547 1', 535 1.536 1.542 1 .542 1.529 1.530 1.546 1.547 1.538 1.539 1.510 1.510 1.543 1.543 1. 5 3 1 1. 5 321
．． 540 1.5401.540
1.5411. 539
1. 5391.539' 1
540 As is clear from the contents of Table 1, the measurement results after the specific gravity [E] for the liquid to be measured are compared with the measurement values using a glass float hole hydrometer as a so-called reference meter. Moreover, according to this liquid preparation system, the specific gravity of the liquid within the specific gravity 'A adjustment Pa (30) is continuously measured and the concentration of the liquid is automatically adjusted. Because of this, the concentration can always be maintained at the target concentration, unlike conventional manual adjustment in batch operations. Further, the continuity of necessary operations and the stability of the process due to the reduction of variations are increased, and a significant improvement in productivity is achieved.

Although the liquid preparation system described above is related to adjusting the specific gravity of a liquid, it goes without saying that it can be applied in exactly the same way to adjusting the slurry concentration. That is, by incorporating necessary equipment such as an evaporation concentration device or a crystallization device into the process in place of the specific gravity adjustment tank (30), effective operation management that accurately measures the desired slurry concentration can be achieved. You will be able to do this.

In addition, as the strain gauge constituting the strain gauge type specific weight measuring device in this invention, it is appropriate to use a strain gauge with high precision, for example, a deviation error of about 0.02% from the maximum measured value, and a digital ratio As a weight indicator, its resolution is 0.
．． A high resolution of about 0.005% is appropriate, and by using these, the overall measurement accuracy is:
An error of 0.1% for the maximum measured value will be guaranteed. Furthermore, the above-described apparatus and system according to the present invention are easy to handle and are suitable for both individual measurements and on-line measurements. In particular, as an on-line version, it can be effective for process control of liquids, slurries, and other liquids in various production lines.

That is, the apparatus and system of the present invention have the advantage that the slurry concentration can be directly measured by continuously determining the specific gravity value for any reference liquid material.

Here, a case where the strain gauge type specific gravity measuring device according to the present invention is used as a hydrometer will be explained. First, a needle tank in the strain gauge type specific gravity measuring device is filled with water, and its weight is accurately measured. The weight thus measured was converted to water weight at 4°C to calculate the volume of the tank, and the result was transferred to a digital specific weight indicator at 1.000.
0 Next, the water is removed, a liquid material to be measured is filled, and its weight is measured.

Thereafter, the stored weight of water at 4° C. and the weight of the liquid material are compared, and the specific gravity value is quickly and accurately displayed on a digital specific weight indicator.

[Effects of the Invention] As explained above, the present invention relates to a strain gauge type specific weight measuring device whose configuration is relatively simple.
It is not affected by the chemical properties of the liquid, and the specific weight of even slurry-like liquids can be measured with good accuracy. That is, the strain gauge type specific weight measuring device according to the present invention includes a strain gauge attached to a support fixed within a predetermined frame; Measuring tank: a flexible tube attached to the inlet and outlet of the measuring tank via flanges attached to each; and a fixed valve in which the flexible tube is provided with a corresponding predetermined valve. The strain gauge operates on the principle that the entire load on the measuring tank is applied to the strain gauge. Therefore, the strain gauge type specific weight measuring device according to the present invention can be designed by arbitrarily selecting the dimensions and shape of the measuring tank used, as long as it operates based on the above-mentioned principle. Its scope of application will be extremely wide.

Furthermore, when the strain gauge type specific weight measuring device according to the present invention is applied to adjust the specific gravity or density of a liquid or slurry, a liquid preparation system can be easily configured based on the above-mentioned simple principle. .

That is, the liquid preparation system according to the present invention includes: a raw material liquid supply pipe; a diluent liquid supply pipe; a specific weight adjustment tank with one stirrer to which the raw material liquid and diluted liquid are supplied to obtain a desired adjusted liquid; i A specific ffi amount measuring device attached via a branch pipe connected to the circulation pipe of the adjustment tank;
The specific gravity -1it'A via the specific weight measuring device
a return pipe configured to return to the W tank; a specific weight measurement system comprising: a switching valve that defines the transfer direction of the adjustment liquid; a circulation pipe that circulates the adjustment liquid to the specific weight adjustment tank; A liquid supply pipe that transfers the liquid adjustment liquid for the next process of using the liquid liquid The opening degree is automatically controlled by a feedback signal from the measuring device, or the specific weight value of the regulating liquid being circulated is continuously measured by the specific weight measuring device, and the specific weight value is continuously measured by the specific weight measuring device. The measured value is compared with a predetermined setting value stored in advance in the measuring device, and depending on the result of this comparison, the opening/closing control of the switching valve in the circulation system is automatically performed, and the regulation liquid is circulated. Since either the continuation of the process or the transfer for the next step of using the adjustment liquid is selected, the desired "AH operation" can be performed while performing complete online measurement.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a strain gauge type specific gravity measuring device according to the present invention, and FIG. 2 shows a second embodiment of the strain gauge type specific gravity measuring device according to the present invention. A schematic configuration diagram, FIG. 3 is a schematic configuration diagram showing a third embodiment of the strain gauge type specific gravity measuring device according to the present invention, and FIG.
1 is a schematic configuration diagram illustrating a liquid preparation system according to the present invention. (1) is the meter M, tank, (2) is the flexible tube, (3) is the fixed tube, (4 is the valve, (5 is the strain gauge, (6 is the adjustable bolt, (7) is the sabot), (8 is a temperature sensor, (9 is a frame, (10 is a temperature compensator), (11) is a digital temperature indicator, (12 is a digital specific weight indicator, (13 is a holder, (14) is a spacer, (15 is a balancer.

Claims (6)

[Claims] (1) a strain gauge mounted on a support fixed within a predetermined frame; a metering tank linked to the strain gauge to measure the volume of a predetermined liquid substance; an inlet and a flow rate of the metering tank; A specific gravity measuring device comprising: a flexible tube attached to each outlet via a flange attached to each; a fixed tube in which a predetermined valve corresponding to each of the flexible tubes is provided; A specific weight measuring device, characterized in that the entire load on the weighing tank is applied to the strain gauge. (2) The measuring tank is constructed by winding a pipe made of a flexible material in a coil around a predetermined holder that stands upright in the vertical direction, and both ends of the pipe are connected to the flexible material. 2. The specific weight measuring device according to claim 1, wherein the specific gravity measuring device is adapted to function as a tube. (3) The measuring tank is constructed by winding a pipe made of a rigid material into a coil, and a flexible tube is attached to each end of the pipe via flanges attached to each end. The specific weight measuring device according to claim 1, characterized in that: (4) Temperature sensor, temperature compensator, digital temperature indicator,
Claims 1 to 3 further include a digital specific weight indicator and a balancer functioning as a braking means, and are capable of digitally displaying the specific weight of the liquid substance. The specific weight measuring device according to any one of items 3 to 3. (5) Supply pipe for raw material liquid; Supply pipe for diluted liquid; Specific weight adjustment tank with a stirrer to which the raw material liquid and diluted liquid are supplied to obtain the desired adjusted liquid; connected to the circulation pipe of the specific weight adjustment tank. a specific weight measuring device attached via a branched pipe; a return pipe configured to return to the specific weight adjusting tank via the specific weight measuring device; and a specific weight measuring system. A switching valve that defines the transfer direction of the adjustment liquid; A circulation pipe that circulates the adjustment liquid to the specific weight adjustment tank; A liquid feeding pipe that transfers the adjustment liquid for the next adjustment liquid usage process; Liquid circulation system: A liquid preparation system consisting of: The automatic adjustment valve provided in the diluted liquid supply pipe has its opening degree automatically controlled by a feedback signal from the specific weight measuring device. A liquid preparation system characterized by: (6) The specific weight value of the circulating adjustment liquid is continuously measured by the specific weight measuring device, and the measured value is compared with a predetermined setting value stored in advance in the specific weight measuring device. is made, and the opening/closing control of the switching valve in the circulation system is automatically performed according to the result of this comparison,
6. The liquid preparation system according to claim 5, wherein either the continuation of circulation of the adjustment liquid or the transfer for the next step of using the adjustment liquid is selected.