JP7026285B1 - Inventory amount calculation device and inventory amount calculation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the calculation accuracy of an inventory amount. An inventory amount calculation device according to an embodiment of an embodiment includes a first displacement meter, a second displacement meter, and a calculation unit. The first displacement meter is provided at the upper part of the storage tank, and is provided so that the first distance, which is the distance to the center of the powder surface housed in the storage tank, can be measured vertically by the measurement wave. The second displacement meter is provided so that the second distance, which is the distance to the powder surface at a predetermined angle with respect to the vertical direction, can be measured by a measurement wave. The calculation unit includes the case where the surface shape of the powder surface is a depressed shape based on the measurement result of the first displacement meter, the measurement result of the second displacement meter, and the type of the powder contained in the storage tank. Calculate the amount of body stock. [Selection diagram] FIG. 8

Description

The embodiment of the disclosure relates to an inventory amount calculation device and an inventory amount calculation method.

Conventionally, a storage tank for storing powders such as raw materials, products, grains, and feeds, and having a cylindrical silo portion and a funnel-shaped discharge portion is known.

The powder contained in such a storage tank behaves like a fluid as an aggregate, although the individual particles are solid. For this reason, it is known that the surface shape of the powder as an aggregate when it is put into the tank is a "mountain" shape, and it changes to a "mortar" shape as it is discharged.

Therefore, when calculating the inventory amount of powder in the tank, even if the height from the opening to the surface of the upper part of the tank is measured with a non-contact displacement meter using ultrasonic waves or lasers, the surface shape will be Since it is not always horizontal, it is not possible to calculate the correct inventory amount.

Therefore, in order to solve this problem, a method has been proposed in which multiple points on the slope are measured with a displacement meter, the angle of repose for each of the mountain shape and the mortar shape is calculated each time, and mathematical calculations are performed to calculate the inventory amount. (For example, see Patent Document 1).

Japanese Patent No. 4419239

However, the above-mentioned conventional technique has room for further improvement in improving the accuracy of calculating the inventory amount.

For example, depending on the type of powder, in addition to changing the surface shape to the shape of a mortar, the center of the bottom of the mortar may often be depressed. Therefore, it is not possible to accurately calculate the inventory amount by simply obtaining the angle of repose as in the conventional technique.

In addition, the length of this depression may lead to the discharge port of the tank, which may cause an event in which powder is not discharged even though it is in stock, which is an operational issue. .. In particular, when referring to livestock feed, mash-based feed, which is the most consumed in the livestock industry, tends to collapse during operation, so it is not possible to perform accurate inventory management with conventional technology, and visual inventory confirmation is possible. It has become mandatory and is a heavy burden on producers.

One aspect of the embodiment is made in view of the above, and an object thereof is to provide an inventory amount calculation device and an inventory amount calculation method capable of improving the calculation accuracy of the inventory amount.

The inventory amount calculation device according to one embodiment includes a first displacement meter, a second displacement meter, and a calculation unit. The first displacement meter is provided at the upper part of the storage tank, and is provided so that the first distance, which is the distance to the center of the powder surface housed in the storage tank, can be measured vertically by a measurement wave. The second displacement meter is provided so that a second distance, which is a distance to the powder surface at a predetermined angle with respect to the vertical direction, can be measured by a measurement wave. In the calculation unit, the surface shape of the powder surface is a depressed shape based on the measurement result of the first displacement meter, the measurement result of the second displacement meter, and the type of powder contained in the storage tank. The stock amount of the powder including the case is calculated. In addition, the calculation unit calculates the inventory amount of the powder based on the angle of repose and the depression diameter according to the type of the powder.

According to one aspect of the embodiment, the accuracy of calculating the inventory amount can be improved.

FIG. 1 is a perspective view of a storage tank. FIG. 2 is a schematic cross-sectional view (No. 1) of the storage tank in which the powder is contained. FIG. 3 is a schematic cross-sectional view (No. 2) of the storage tank in which the powder is contained. FIG. 4 is a schematic explanatory diagram (No. 1) of the existing technology. FIG. 5 is a schematic explanatory diagram (No. 2) of the existing technology. FIG. 6 is a schematic cross-sectional view (No. 3) of the storage tank in which the powder is contained. FIG. 7 is a diagram showing a configuration example of the inventory amount calculation system according to the embodiment. FIG. 8 is a block diagram of the inventory amount calculation device according to the embodiment. FIG. 9 is a diagram showing an example of powder-specific information. FIG. 10 is an explanatory diagram of a calculation method when the surface shape of the powder is a mountain shape. FIG. 11 is an explanatory diagram of a calculation method when the surface shape of the powder is a mortar shape. FIG. 12 is an explanatory diagram of a calculation method when the surface shape of the powder is a depressed shape. FIG. 13 is an explanatory diagram of a method of determining the mounting angle of the second displacement meter for measuring the second distance.

Hereinafter, embodiments of the inventory amount calculation device and the inventory amount calculation method disclosed in the present application will be described in detail with reference to the attached drawings. The present invention is not limited to the embodiments shown below.

Further, when the term "powder" is used in the following description, it is defined as "powder" in a broad sense including relatively coarse particles.

First, an outline of the inventory amount calculation method according to the embodiment will be described. FIG. 1 is a perspective view of the storage tank 10.

As shown in FIG. 1, the storage tank 10 has a silo portion 11, a funnel portion 12, and an upper surface portion 13. The silo portion 11 is formed in a cylindrical shape. The funnel portion 12 is formed in a funnel shape and is connected to the lower portion of the silo portion 11.

A discharge port (not shown) is formed in the lower part of the funnel portion 12. A cutting device such as a vacuum feeder or a rotary feeder is usually connected to the discharge port so as to discharge the powder stored in the storage tank 10 as needed. The upper surface portion 13 is connected to the upper part of the silo portion 11 and has an opening portion 13a.

The powder contained in the storage tank 10 is charged through the opening 13a by opening the hatch provided at the upper part of the tank. The contained powder is conveyed from the discharge port at the lower part of the funnel portion 12 to the next process of the line by using a cutting device or the like based on the production plan.

Next, FIG. 2 is a schematic cross-sectional view (No. 1) of the storage tank 10 in a state where the powder is stored. Further, FIG. 3 is a schematic cross-sectional view (No. 2) of the storage tank 10 in a state where the powder is contained.

Although the individual particles of the powder contained in the storage tank 10 are solid, they behave like a fluid as an aggregate, so that the surface shape of the aggregate is, for example, the powder is discharged to some extent from the time of charging the tank. Until this is done, the surface shape is "mountain-shaped" as shown in FIG. Further, as the powder is discharged, the surface shape changes to a mortar shape as shown in FIG.

As an existing technology for calculating the stock amount of such powder, the stock amount is calculated by measuring multiple points on the slope with a displacement meter, calculating the angle of repose of each of the mountain shape and the mortar shape each time, and performing mathematical calculation. There is something to do.

FIG. 4 is a schematic explanatory diagram (No. 1) of the existing technology. Further, FIG. 5 is a schematic explanatory diagram (No. 2) of the existing technology.

As shown in FIG. 4, the inventory amount calculation system 1'according to the existing technology has one measuring unit 5 installed above the storage tank 10 and a mirror unit 9 movably provided in the vicinity of the measuring unit 5. And include.

The measuring unit 5 is, for example, one non-contact type displacement meter using a laser, and measures a plurality of points on the mountain-shaped surface of the powder while moving the mirror unit 9. Then, the inventory amount calculation system 1'calculates the angle of repose θa based on the plurality of points measured by the measuring unit 5.

Further, as shown in FIG. 5, in the case of the mortar shape as well, the measuring unit 5 measures a plurality of points on the surface of the mortar shape of the powder. Then, the inventory amount calculation system 1'calculates the angle of repose θb based on the plurality of points measured by the measuring unit 5. In the following, the angle of repose θa is appropriately referred to as “angle of repose (mountain)”, and the angle of repose θb is appropriately referred to as “angle of repose (valley)”.

Here, FIG. 6 is a schematic cross-sectional view (No. 3) of the storage tank 10 in a state where the powder is stored. However, depending on the type of powder, for example, the surface shape may change to the mortar shape, and as shown in FIG. 6, the center of the mortar bottom may often be depressed. Therefore, it is not possible to accurately calculate the inventory amount by simply obtaining the angles of repose θa and θb as in the existing technology.

Further, as shown in FIG. 6, the length of this depression may be connected to the discharge port of the storage tank 10, which may cause an event that the powder is not discharged even though it is in stock. , It has become an operational issue. In particular, when the powder is a mash-based feed, grains, nutrients, oil components, etc. are integrated and the powder tends to be difficult to be discharged.

Therefore, in the inventory amount calculation method according to the embodiment, the first distance, which is the distance to the center of the powder surface contained in the storage tank 10 provided in the upper part of the storage tank 10, is measured in the vertical direction by a measurement wave. A second displacement meter 5b provided so that a second distance, which is a distance to a powder surface at a predetermined angle with respect to the above-mentioned vertical direction, can be measured by a measurement wave and a first displacement meter provided so as to be possible. This is an inventory amount calculation method executed by the inventory amount calculation device 100 having the above, based on the measurement result of the first displacement meter 5a, the measurement result of the second displacement meter 5b, and the type of powder contained in the storage tank 10. Therefore, it was decided to calculate the stock amount of the powder including the case where the surface shape of the powder surface is a depressed shape.

FIG. 7 is a diagram showing a configuration example of the inventory amount calculation system 1 according to the embodiment. Specifically, as shown in FIG. 7, in the inventory amount calculation method according to the embodiment, first, a measuring unit 5 having two displacement meters is provided in the vicinity of the above-mentioned opening 13a of the storage tank 10. .. As shown in FIG. 7, the measuring unit 5 according to the embodiment has a first displacement meter 5a and a second displacement meter 5b.

Then, in the inventory amount calculation method according to the embodiment, the first displacement meter 5a measures the distance in the vertical direction to the center of the powder surface, and the second displacement meter 5b makes an angle with respect to the above-mentioned vertical direction. Measure the distance to the powder surface in the vertical direction.

Then, the inventory amount calculation device 100 calculates the inventory amount based on the measurement result of the measuring unit 5. The inventory amount calculation device 100 holds parameters for calculating the inventory amount for each powder type set by actual measurement in advance, and for example, the corresponding parameters are set according to the powder type input by the user. select.

Then, the inventory amount calculation device 100 uses the two distances measured by the measuring unit 5, the parameters for each selected powder type, and the calculation formula held in advance to determine the inventory amount of the powder in the storage tank 10. calculate.

Further, the inventory amount calculation device 100 causes a depression in which the powder is difficult to be discharged even if the powder is in stock, based on the vertical distance to the center of the powder surface out of the two distances measured by the measuring unit 5. Is detected.

This makes it possible to improve the accuracy of calculating the inventory amount as compared with the existing technology. In addition, it is possible to detect the occurrence of depression in which powder is difficult to be discharged even if it is in stock. Hereinafter, the configuration of the inventory amount calculation device 100 to which the inventory amount calculation method according to the above-described embodiment is applied will be described more specifically.

FIG. 8 is a block diagram of the inventory amount calculation device 100 according to the embodiment. In FIG. 8, the components necessary for explaining the features of the present embodiment are represented by functional blocks, and the description of general components is omitted.

In other words, each component shown in FIG. 8 is a functional concept and does not necessarily have to be physically configured as shown. For example, the specific form of distribution / integration of each functional block is not limited to the one shown in the figure, and all or part of it is functionally or physically distributed in arbitrary units according to various loads and usage conditions. -It is possible to integrate and configure.

Further, in the description using FIG. 8, the description of the components already described so far may be simplified or omitted.

As shown in FIG. 8, the inventory amount calculation device 100 according to the embodiment includes a storage unit 101 and a control unit 102. Further, in the inventory amount calculation device 100, the input unit 3, the measurement unit 5, and the output unit 7 are connected.

The input unit 3 is realized by a keyboard, a mouse, a touch panel, or the like. As described above, the measuring unit 5 is provided in the vicinity of the opening 13a of the storage tank 10. The measuring unit 5 has a first displacement meter 5a and a second displacement meter 5b, which are two non-contact type displacement meters using radio waves and lasers as measurement waves.

The first displacement meter 5a is provided so as to be able to measure the first distance l1, which is the vertical distance to the center of the powder surface housed in the storage tank 10. The second displacement meter 5b is provided so as to be capable of measuring the second distance l2, which is the distance to the powder surface in the direction provided with the angle θc with respect to the above-mentioned vertical direction. That is, θc corresponds to the mounting angle of the second displacement meter 5b. It is desirable that the mounting angle θc is such that it does not interfere with the depression that occurs. The method for determining the mounting angle θc will be described later with reference to FIG.

The measuring unit 5 periodically measures the first distance l1 and the second distance l2 according to the production activity, and transmits the measured values to the calculation unit 102c described later. The output unit 7 is realized by a display or the like.

The storage unit 101 is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory), a ROM (Read Only Memory), or a flash memory (Flash Memory), or a storage device such as a hard disk or an optical disk. In the example shown in FIG. 8, the storage unit 101 stores the tank information 101a, the powder-specific information DB (Data Base) 101b, and the calculation formula information 101c.

The tank information 101a is information in which various dimensions and the like related to the storage tank 10 are set. Various dimensions include the tank length of the storage tank 10, the tank diameter, the distance from the first displacement meter 5a to the discharge port, and the like.

The powder-specific information DB 101b is a database in which powder-specific information, which is information for each powder type, including parameters for calculating the inventory amount for each powder type set by actual measurement in advance, is stored.

Here, FIG. 9 is a diagram showing an example of powder-specific information. As shown in FIG. 9, the powder-specific information includes, for example, a "powder type" item, an "angle of repose (mountain)" item, an "angle of repose (valley)" item, and a "depression diameter" item. include.

In the "powder type" item, the identifier of the powder type is stored. In the "angle of repose (mountain)" item, the angle of repose (mountain) for each powder type set by actually measuring in advance is stored. In the "angle of repose (valley)" item, the angle of repose (valley) for each powder type set by actually measuring in advance is stored. In the "depression diameter" item, the depression diameter at the time of occurrence of depression for each powder type set by actual measurement in advance is stored.

Returning to the description of FIG. The calculation formula information 101c is information including a calculation formula used for calculating the inventory amount. Such a calculation formula is registered in advance for each case, for example, when the powder has a mountain shape, when the powder has a mortar shape, or when the powder has a depressed shape. Further, the calculation formula may be registered for each powder type based on the above-mentioned powder-specific information, in addition to each case. In this case, the calculation formula information 101c may be included in the powder-specific information DB 101b.

The control unit 102 is a controller, and for example, various programs stored in the storage unit 101 by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like execute RAM as a work area. It is realized by being done. Further, the control unit 102 can be realized by, for example, an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

The control unit 102 includes a setting unit 102a, an acquisition unit 102b, a calculation unit 102c, a detection unit 102d, and a notification unit 102e, and realizes or executes an information processing function or operation described below.

The setting unit 102a inputs various information such as tank information 101a, powder-specific information DB 101b, and calculation formula information 101c based on user input via the input unit 3 before the actual operation of the inventory amount calculation device 100. Set in advance.

The setting unit 102a may set the tank information 101a, the powder-specific information DB 101b, and the calculation formula information 101c based on the information received from the external device via the network. Further, the setting unit 102a may appropriately update the powder-specific information DB 101b and the like based on the measurement result of the measurement unit 5 acquired by the acquisition unit 102b during the actual operation of the inventory amount calculation device 100.

The acquisition unit 102b acquires the powder type of the powder actually stored in the storage tank 10 during the actual operation of the inventory amount calculation device 100 based on the user's input via the input unit 3. The acquisition unit 102b acquires the powder type of the powder each time the powder stored in the storage tank 10 is changed. Further, the acquisition unit 102b outputs the acquired powder type to the calculation unit 102c.

Further, the acquisition unit 102b acquires the measurement result of the measurement unit 5 at any time. Further, the acquisition unit 102b outputs the acquired measurement result to the calculation unit 102c. Further, the acquisition unit 102b outputs the acquired measurement result to the calculation unit 102c. Further, the acquisition unit 102b outputs the acquired measurement result to the setting unit 102a, and causes the setting unit 102a to appropriately update the powder-specific information DB 101b and the like.

The calculation unit 102c selects the corresponding parameter from the powder-specific information DB 101b according to the powder type acquired by the acquisition unit 102b. Further, the calculation unit 102c inputs the selected parameter, the information included in the tank information 101a, and the measurement result acquired by the acquisition unit 102b into the corresponding calculation formula of the calculation formula information 101c, and inputs the stock amount of the powder to the corresponding calculation formula. calculate. The specific method of calculating the inventory amount will be described later with reference to FIGS. 10 to 12. Further, the calculation unit 102c outputs the calculated calculation result to the notification unit 102e.

The detection unit 102d includes the vertical distance to the center of the powder surface measured by the first displacement meter 5a and the distance from the first displacement meter 5a to the discharge port, which are included in the measurement results acquired by the acquisition unit 102b. The distances are compared, and if they are almost equal, it is detected that a depression that may not be able to discharge the stock has occurred. Further, the detection unit 102d outputs the detected detection result to the notification unit 102e.

The notification unit 102e notifies the user by outputting the calculation result calculated by the calculation unit 102c and the detection result detected by the detection unit 102d to the output unit 7.

Next, the calculation process executed by the calculation unit 102c will be described with reference to FIGS. 10 to 12. FIG. 10 is an explanatory diagram of a calculation method when the surface shape of the powder is a mountain shape. Further, FIG. 11 is an explanatory diagram of a calculation method when the surface shape of the powder is a mortar shape. Further, FIG. 12 is an explanatory diagram of a calculation method when the surface shape of the powder is a depressed shape.

First, the symbols used in the explanations of FIGS. 10 to 12 will be described. θa indicates the angle of repose (mountain) according to the powder type. θb indicates the angle of repose (valley) according to the powder type. θc indicates the mounting angle of the second displacement meter 5b. L indicates the tank length of the storage tank 10. R indicates the tank diameter of the storage tank 10.

Va indicates the volume of the conical portion, which is a conical portion, in the entire shape of the powder contained in the storage tank 10. Vb also indicates the volume of the cylindrical portion, which is the cylindrical portion, in the entire shape of the powder. Vc also indicates the volume of the depressed portion, which is the depressed portion, in the entire shape of the powder.

V1 indicates the volume of the known funnel portion 12. Rh indicates the depression diameter according to the powder type. l1 indicates the measured value of the first distance measured by the first displacement meter 5a. l2 indicates the measured value of the second distance measured by the second displacement meter 5b.

As shown in FIG. 10, when the surface shape of the powder is a mountain shape, the straight line SL1 in the figure is represented by the following equation (1) in the xy coordinate system having the measurement position of the first distance l1 as the origin. be able to.

Further, the straight line SL2 can be expressed by the following equation (2).

Further, the straight line SL3 can be expressed by the following equation (3).

Further, assuming that the intersection of the straight lines SL2 and SL3 is P (xp, yp), xp and yp can be expressed by the following equation (4).

On the premise of this, first, the volume Vmou of the entire powder in the storage tank 10 in the case of FIG. 10 can be obtained by the following formula (5).

Then, the volume Va of the conical portion can be obtained by the following formula (6) using the above formulas (1) to (4).

Further, the volume Vb of the cylindrical portion can be obtained by the following formula (7).

Then, by substituting the calculation results of the equations (6) and (7) into the above equation (5), the volume Vmou of the powder in the case of FIG. 10 can be calculated.

Next, as shown in FIG. 11, when the surface shape of the powder is a mortar shape, the straight line SL1 in the figure is represented by the above formula (1), and the straight line SL2 is represented by the above formula (2). be able to.

Further, the straight line SL3 can be expressed by the following equation (8).

Further, assuming that the intersection of the straight lines SL2 and SL3 is P (xp, yp), xp and yp can be expressed by the following equation (9).

On the premise of this, the volume Vmor of the entire powder in the storage tank 10 in the case of FIG. 11 can be obtained by the following formula (10).

Then, the volume Va of the conical portion can be obtained by the following equation (11) using the above equations (1), (2), (8) and (9).

Further, the volume Vb of the cylindrical portion can be obtained by the following formula (12).

Then, by substituting the calculation results of the equations (11) and (12) into the above equation (10), the volume Vmor of the powder in the case of FIG. 11 can be calculated.

Next, as shown in FIG. 12, when the surface shape of the powder is a depressed shape, the straight line SL3 in the figure can be represented by the above formula (8).

Further, the straight line SL4 can be expressed by the following equation (13).

Further, assuming that the intersection of the straight lines SL3 and SL4 is Q (xq, yq), xq and yq can be expressed by the following equation (14).

On the premise of this, the volume Vdep of the entire powder in the storage tank 10 in the case of FIG. 12 can be obtained by the following formula (15).

Then, the volume Vc of the depressed portion can be obtained by the following equation (16) using the above equations (8), (13) and (14).

Then, by substituting the calculation result by the formula (16) into the above formula (15), the volume Vdep of the powder in the case of FIG. 12 can be calculated.

Next, a method of determining the mounting angle θc of the second displacement meter 5b for measuring the second distance l2 will be described. FIG. 13 is an explanatory diagram of a method of determining the mounting angle θc of the second displacement meter 5b for measuring the second distance l2.

As shown in FIG. 13, in the inventory amount calculation system 1, the upper limit distance Lmax to be measured can be determined by adjusting the mounting angle θc of the second displacement meter 5b for measuring the second distance l2.

Specifically, as shown in FIG. 13, the upper limit distance Lmax is the point where the measurement wave transmitted by the second displacement meter 5b hits the side surface of the storage tank 10. At this time, the measurement lower limit distance Lmin is “Lmin = Rh * tan (θc)” in which the measurement wave is not affected by the depression.

Although the upper end of the funnel portion 12 is shown as the upper limit of measurement in FIG. 13, the upper limit distance of measurement may be set in the funnel portion 12.

As described above, the inventory amount calculation device 100 according to the embodiment includes a first displacement meter 5a, a second displacement meter 5b, and a calculation unit 102c. The first displacement meter 5a is provided on the upper part of the storage tank 10 and is provided so that the first distance l1, which is the distance to the center of the powder surface housed in the storage tank 10, can be measured vertically by a measurement wave. .. The second displacement meter 5b is provided so that the second distance l2, which is the distance to the powder surface having a predetermined angle θc with respect to the vertical direction, can be measured by a measurement wave. In the calculation unit 102c, the surface shape of the powder surface is a depressed shape based on the measurement result of the first displacement meter 5a, the measurement result of the second displacement meter 5b, and the type of the powder contained in the storage tank 10. Calculate the stock quantity of powder including the case.

Therefore, according to the inventory amount calculation device 100 according to the embodiment, it is possible to improve the calculation accuracy of the inventory amount.

In addition, the user can plan or instruct the charging of powder by checking the inventory amount output by the inventory amount calculation device 100, and visually inspect the inventory amount of the actual tank installed in the field in the past. It is possible to save a lot of labor from inventory management. In addition, it is possible to recognize the depression in which the powder may not be discharged, and to take prompt measures.

In the above-described embodiment, the case of calculating the inventory amount for one storage tank 10 has been given as an example, but the present invention is not limited to this. For example, the inventory amount calculation device 100 may be configured as a server device that integrates a plurality of storage tanks 10 via a network. Then, in such a case, the calculation unit 102c acquires the first distance l1 and the second distance l2 for the plurality of storage tanks 10, and is based on the first distance l1 and the second distance l2 for each acquired storage tank 10. The amount of powder in stock for each of the storage tanks 10 may be calculated.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments described and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

1 Stock amount calculation system 3 Input part 5 Measuring part 5a 1st displacement meter 5b 2nd displacement meter 7 Output part 10 Storage tank 11 Silo part 12 Leakage part 13 Top surface part 13a Opening part 100 Stock amount calculation device 101 Storage part 101a Tank information 101b Information DB by powder
101c Calculation formula information 102 Control unit 102a Setting unit 102b Acquisition unit 102c Calculation unit 102d Detection unit 102e Notification unit

Claims (7)

A first displacement meter provided at the top of the storage tank and capable of measuring the first distance, which is the distance to the center of the powder surface contained in the storage tank, in the vertical direction by a measurement wave.
A second displacement meter provided so that the second distance, which is the distance to the powder surface at a predetermined angle with respect to the vertical direction, can be measured by a measurement wave.
The powder including the case where the surface shape of the powder surface is a depressed shape based on the measurement result of the first displacement meter, the measurement result of the second displacement meter, and the type of the powder contained in the storage tank. Equipped with a calculation unit that calculates the amount of body stock
The calculation unit
An inventory amount calculation device characterized in that the inventory amount of the powder is calculated based on the angle of repose and the depression diameter according to the type of the powder . If the first distance measured by the first displacement meter and the distance from the first displacement meter to the powder discharge port provided in the lower part of the storage tank are substantially equal, the stock may not be discharged. The inventory amount calculation device according to claim 1 , further comprising a detection unit for detecting the occurrence of a certain depression. The calculation unit
The inventory amount calculation device according to claim 1 or 2 , wherein the inventory amount of the powder is calculated when the surface shape is a mountain shape and when the surface shape is a mortar shape. .. The calculation unit
The inventory amount calculation device according to claim 1 , 2 or 3 , wherein the inventory amount of the powder is calculated by using a calculation formula according to the type of the powder and the surface shape. The calculation unit
The feature is that the first distance and the second distance of the plurality of storage tanks are acquired, and the stock amount of the powder in each of the storage tanks is calculated based on the first distance and the second distance. The inventory amount calculation device according to any one of claims 1 to 4 . The inventory amount calculation device according to any one of claims 1 to 5 , wherein the powder is a feed containing a mash type. A first displacement meter provided at the top of the storage tank and capable of measuring the first distance, which is the distance to the center of the powder surface housed in the storage tank, in the vertical direction by a measurement wave, and the vertical. An inventory amount calculation method executed by an inventory amount calculation device having a second displacement meter provided so that a second distance, which is a distance to the powder surface at a predetermined angle with respect to a direction, can be measured by a measurement wave. And,
The powder including the case where the surface shape of the powder surface is a depressed shape based on the measurement result of the first displacement meter, the measurement result of the second displacement meter, and the type of the powder contained in the storage tank. Includes a calculation process to calculate the amount of body stock
The calculation step is
The inventory amount of the powder is calculated based on the angle of repose and the depression diameter according to the type of the powder.
An inventory amount calculation method characterized by this.

Images