WO2023074497A1

WO2023074497A1 - Inventory calculating device and inventory calculating method

Info

Publication number: WO2023074497A1
Application number: PCT/JP2022/038931
Authority: WO
Inventors: 憲吾古澤; 金姫朴; 啓介小舟; 信一境田; 俊和松尾
Original assignee: 株式会社Ye Digital
Priority date: 2021-11-01
Filing date: 2022-10-19
Publication date: 2023-05-04
Also published as: JP7026285B1; JP2023067445A

Abstract

An inventory calculating device (100) according to one aspect of an embodiment comprises a first displacement gauge (5a), a second displacement gauge (5b), and a calculating unit (102c). The first displacement gauge (5a) is provided in an upper portion of a storage tank (10), and is provided in such a way as to be capable of measuring, in a vertical direction by means of measuring waves, a first distance (I1), which is a distance to a central portion of a surface of powder accommodated in the storage tank (10). The second displacement gauge (5b) is provided in such a way as to be capable of measuring, by means of measuring waves, a second distance (I2), which is a distance to the surface of the powder at a prescribed angle (θc) relative to the vertical direction. The calculating unit (102c) calculates an inventory of the powder, including a case in which a surface shape of the powder surface is a recessed shape, on the basis of the measurement result from the first displacement gauge (5a), the measurement result from the second displacement gauge (5b), and a type of the powder accommodated in the storage tank (10).

Description

INVENTORY CALCULATION DEVICE AND INVENTORY CALCULATION METHOD

The disclosed embodiment relates to an inventory amount calculation device and an inventory amount calculation method.

Conventionally, a storage tank is known as a storehouse for storing powders such as raw materials, products, grains, feed, etc., and has a cylindrical silo part and a funnel-shaped discharge part.

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

Therefore, when calculating the amount of powder in the tank, even if the height from the opening at the top of the tank to the surface is measured with a non-contact displacement meter that uses ultrasonic waves or lasers, the surface shape will not be the same. 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 a displacement meter is used to measure multiple points on the slope, the angle of repose of each mountain shape and mortar shape is calculated each time, and a mathematical operation is performed to calculate the inventory amount. (See Patent Document 1, for example).

Japanese Patent No. 4419239

However, the conventional technology described above has room for further improvement in terms of improving the accuracy of inventory calculation.

For example, depending on the type of powder, in addition to the surface shape changing into a mortar shape, the center of the bottom of the mortar often collapses. For this reason, it is not possible to accurately calculate the inventory amount simply by obtaining the angle of repose as in the prior art.

In addition, in some cases, the length of this depression extends to the discharge port of the tank, and for this reason, there are cases where the powder is not discharged even though there is inventory, which is an operational issue. . In particular, when referring to livestock feed, mash-type feed, which is the most consumed in the livestock industry, tends to collapse during operation. It is mandatory, and it is a big burden for producers.

One aspect of the embodiment has been made in view of the above, and aims to provide an inventory amount calculation device and an inventory amount calculation method that can improve the accuracy of calculating the inventory amount.

An inventory quantity calculation device according to one aspect of the embodiment includes a first displacement gauge, a second displacement gauge, and a calculation unit. The first displacement gauge is provided on the top of the storage tank so as to be able to vertically measure a first distance, which is the distance to the center of the surface of the powder contained in the storage tank, by means of measurement waves. The second displacement meter is provided so as to be able to measure a second distance, which is a distance to the powder surface at a predetermined angle with respect to the vertical direction, by means of the measurement wave. The calculation unit determines that the surface shape of the powder surface is a concave shape based on the measurement result of the first displacement gauge, the measurement result of the second displacement gauge, and the type of powder stored in the storage tank. Calculate the inventory quantity of the powder including the case.

According to one aspect of the embodiment, it is possible to improve the calculation accuracy of the inventory amount.

1 is a perspective view of a storage tank; FIG. FIG. 2 is a schematic sectional view (Part 1) of a storage tank containing powder. FIG. 3 is a schematic cross-sectional view (2) of the storage tank containing powder. FIG. 4 is a schematic explanatory diagram (Part 1) of the existing technology. FIG. 5 is a schematic explanatory diagram (Part 2) of the existing technology. FIG. 6 is a schematic sectional view (No. 3) of the storage tank containing the powder. FIG. 7 is a diagram showing a configuration example of an 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 powder has a mountain-like surface shape. FIG. 11 is an explanatory diagram of the calculation method when the surface shape of the powder is mortar-shaped. FIG. 12 is an explanatory diagram of the 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 attachment angle of the second displacement gauge that measures 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 accompanying drawings. In addition, this invention is not limited by embodiment shown below.

In addition, when "powder" is used in the following explanation, it is a broadly defined "powder" that includes relatively coarse grains.

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

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 part 11 is formed in a cylindrical shape. The funnel portion 12 is formed in a funnel shape and connected to the lower portion of the silo portion 11 .

A discharge port (not shown) is formed at the bottom of the funnel portion 12 . A discharging device such as a vacuum feeder or a rotary feeder is usually connected to the discharge port, and the powder stored in the storage tank 10 is discharged as required. The upper surface portion 13 is connected to the upper portion of the silo portion 11 and has an opening portion 13a.

The powder contained in the storage tank 10 is fed through the opening 13a by opening the hatch provided at the top of the tank. The contained powder is conveyed to the next process of the line from the outlet at the bottom of the funnel 12 using a cutting device or the like based on the production plan.

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

The powder contained in the storage tank 10 is solid as an individual particle, but behaves like a fluid as an aggregate. 2, the surface profile 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 inventory of such powder, a displacement meter is used to measure multiple points on the slope, and the angle of repose of each mountain shape and mortar shape is calculated each time, and mathematical calculations are performed to calculate the inventory amount. there is something to do

FIG. 4 is a schematic explanatory diagram (part 1) of the existing technology. Also, FIG. 5 is a schematic explanatory diagram (Part 2) of the existing technology.

As shown in FIG. 4, the inventory quantity calculation system 1' according to the existing technology includes one measurement unit 5 installed above the storage tank 10, and a mirror unit 9 movably provided near the measurement unit 5. including.

The measurement unit 5 is, for example, a 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 quantity calculation system 1 ′ calculates the angle of repose θa based on the multiple points measured by the measurement unit 5 .

Also, as shown in FIG. 5, in the case of the mortar shape, the measurement unit 5 similarly measures a plurality of points on the mortar-shaped surface of the powder. Then, the inventory quantity calculation system 1 ′ calculates the angle of repose θb based on the multiple points measured by the measurement unit 5 . In the following description, the angle of repose θa will be referred to as the “angle of repose (mountain)”, and the angle of repose θb will be referred to as the “angle of repose (valley)”.

Here, FIG. 6 is a schematic cross-sectional view (No. 3) of the storage tank 10 in which powder is stored. However, depending on the type of powder, for example, in addition to the surface shape changing into a mortar shape, the center of the bottom of the mortar often collapses as shown in FIG. For this reason, it is not possible to accurately calculate the inventory amount simply by obtaining the angles of repose θa and θb as in the existing technology.

In addition, as shown in FIG. 6, the length of this recession may extend to the discharge port of the storage tank 10, and for this reason, an event may occur in which the powder is not discharged even though there is inventory. is an operational issue. In particular, when the powder is a mash-type feed, grains, nutritional supplements, oil components, etc. are combined, 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 surface of the powder contained in the storage tank 10, is measured in the vertical direction by the measurement wave provided in the upper part of the storage tank 10. and a second displacement meter 5b capable of measuring a second distance, which is the distance to the surface of the powder at a predetermined angle with respect to the vertical direction, by the measurement wave. 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 stored in the storage tank 10 Therefore, the inventories of the powder including the case where the surface shape of the powder surface is a concave shape are calculated.

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 measurement unit 5 having two displacement gauges is provided near the opening 13a of the storage tank 10. . As shown in FIG. 7, the measurement unit 5 according to the embodiment has a first displacement gauge 5a and a second displacement gauge 5b.

In the inventory quantity calculation method according to the embodiment, the first displacement gauge 5a measures the vertical distance to the center of the powder surface, and the second displacement gauge 5b measures the angle with respect to the vertical direction. Measure the distance to the powder surface in the opposite direction.

Then, the inventory amount calculation device 100 calculates the inventory amount based on the measurement result of the measuring unit 5. The inventory quantity calculation device 100 holds parameters for calculating the inventory quantity for each powder type, which are set by actual measurement in advance. select.

Then, the inventory amount calculation device 100 calculates the inventory amount of the powder in the storage tank 10 using the two distances measured by the measuring unit 5, the parameter for each selected powder type, and the calculation formula stored in advance. calculate.

In addition, the inventory amount calculation device 100 determines the vertical distance to the center of the powder surface, which is one of the two distances measured by the measuring unit 5, based on which the powder is hard to be discharged even if there is inventory. to detect.

This makes it possible to improve the accuracy of inventory calculation compared to existing technology. Moreover, even if there is stock, it is possible to detect the occurrence of depressions where powder is difficult to be discharged. 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 addition, in FIG. 8, constituent elements necessary for explaining the features of the present embodiment are represented by functional blocks, and descriptions of general constituent elements are omitted.

In other words, each component illustrated in FIG. 8 is functionally conceptual and does not necessarily need to be physically configured as illustrated. For example, the specific forms of distribution and integration of each functional block are not limited to those shown in the figure, and all or part of them can be functionally or physically distributed in arbitrary units according to various loads and usage conditions.・It is possible to integrate and configure.

In addition, in the description using FIG. 8, the description of the components that have already been described may be simplified or omitted.

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

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

The first displacement gauge 5a is provided so as to be able to measure the first distance l1, which is the vertical distance to the center of the surface of the powder stored in the storage tank 10. The second displacement meter 5b is provided so as to be able to measure a second distance l2, which is the distance to the powder surface in the direction at an angle θc with respect to the 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 set to an angle that does not interfere with the occurrence of recession. A method for determining the mounting angle θc will be described later with reference to FIG. 13 .

The measurement unit 5 periodically measures the first distance l1 and the second distance l2 according to production activities, and transmits the measured values to the calculation unit 102c, which will be described later. The output unit 7 is implemented by a display or the like.

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

The tank information 101a is information in which various dimensions and the like regarding 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 that stores powder-specific information, which is information for each powder type including parameters for calculating the inventory amount for each powder type, which is set by actual measurement in advance.

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 “cavity diameter” item. include.

The "powder type" item stores the identifier of the powder type. The "angle of repose (mountain)" item stores the angle of repose (mountain) set by actual measurement in advance for each powder type. The "angle of repose (valley)" item stores the angle of repose (valley) for each powder type set by actual measurement in advance. The "sinking diameter" item stores the sinking diameter at the time of sinking for each powder type, which is set by actual measurement in advance.

Return to the description of Fig. 8. The calculation formula information 101c is information including a calculation formula used to calculate the inventory amount. Such a calculation formula is registered in advance for each case, for example, when the powder is in the shape of a mountain, when the powder is in the shape of a mortar, and when the powder is in the shape of a depression. In addition to each case, the calculation formula may be registered for each powder type based on the above-described powder-specific information. 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. For example, various programs (not shown) stored in the storage unit 101 are executed by a CPU (Central Processing Unit), MPU (Micro Processing Unit), etc., using RAM as a work area. It is realized by being Also, the control unit 102 can be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

The control unit 102 has a setting unit 102a, an acquisition unit 102b, a calculation unit 102c, a detection unit 102d, and a notification unit 102e, and implements or executes the information processing functions and actions described below.

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

Note that the setting unit 102a may set the tank information 101a, the powder-specific information DB 101b, and the calculation formula information 101c based on information received from an external device via a 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. FIG.

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. In addition, the acquisition unit 102b acquires the powder type of the powder each time the powder stored in the storage tank 10 is changed. The acquisition unit 102b also outputs the acquired powder type to the calculation unit 102c.

In addition, the acquisition unit 102b acquires the measurement result of the measurement unit 5 as needed. The acquisition unit 102b also outputs the acquired measurement result to the calculation unit 102c. The acquisition unit 102b also outputs the acquired measurement result to the calculation unit 102c. The acquisition unit 102b also outputs the acquired measurement result to the setting unit 102a, and causes the setting unit 102a to update the powder-specific information DB 101b and the like as appropriate.

The calculation unit 102c selects a 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 calculates the powder inventory amount. calculate. A specific inventory amount calculation method will be described later with reference to FIGS. 10 to 12. FIG. Further, the calculation unit 102c outputs the calculated calculation result to the notification unit 102e.

The detection unit 102d detects 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 obtained by the obtaining unit 102b. If the distances are compared and approximately equal, it detects that a cave-in has occurred that could prevent the inventory from being discharged. Further, the detection unit 102d outputs the detected result to the notification unit 102e.

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

Next, calculation processing executed by the calculation unit 102c will be described with reference to FIGS. 10 to 12. FIG. FIG. 10 is an explanatory diagram of a calculation method when the powder has a mountain-like surface shape. Moreover, FIG. 11 is explanatory drawing of the calculation method when the surface shape of powder is a mortar shape. Moreover, 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 explanation of FIGS. 10 to 12 will be explained. θa indicates an angle of repose (mountain) corresponding to the type of powder. θb indicates the angle of repose (valley) according to the type of powder. 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 the conical portion, of the entire shape of the powder stored in the storage tank 10 . Vb similarly indicates the volume of the cylindrical portion, which is the cylindrical portion of the entire shape of the powder. Vc similarly indicates the volume of the recessed portion, which is the recessed portion, in the entire shape of the powder.

V1 indicates the volume of the known funnel portion 12. Rh indicates the depression diameter corresponding to the type of powder. 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 mountain-shaped, the straight line SL1 in the drawing is expressed by the following formula (1) in the xy coordinate system with the measurement position of the first distance l1 as the origin. be able to.

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

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

Also, if the intersection point 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).

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

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

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

Also, the straight line SL3 can be represented by the following equation (8).

Also, if the intersection point of the straight lines SL2 and SL3 is P(xp, yp), xp and yp can be expressed by the following equation (9).

Based on this assumption, 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).

The volume Va of the conical portion can be obtained by the following formula (11) using the above formulas (1), (2), (8) and (9).

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

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

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

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

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

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

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 quantity calculation system 1, the upper limit distance Lmax to be measured can be determined by adjusting the attachment angle θc of the second displacement meter 5b that measures the second distance l2.

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

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

As described above, the inventory quantity calculation device 100 according to the embodiment includes the first displacement gauge 5a, the second displacement gauge 5b, and the calculation unit 102c. The first displacement meter 5a is provided at the top of the storage tank 10, and is provided so as to be able to measure a first distance l1, which is the distance to the center of the surface of the powder stored in the storage tank 10, in the vertical direction by the measurement wave. . The second displacement gauge 5b is provided so as to be able to measure a second distance l2, which is the distance to the powder surface at a predetermined angle θc with respect to the vertical direction, by means of the measurement wave. Based on the measurement result of the first displacement gauge 5a, the measurement result of the second displacement gauge 5b, and the type of powder stored in the storage tank 10, the calculation unit 102c determines that the surface shape of the powder surface is a depressed shape. Calculate the powder inventory, 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, by checking the inventory amount output by the inventory amount calculation device 100, the user can plan or instruct the addition of powder. It is possible to greatly save labor from inventory management to be done. In addition, it is possible to recognize depressions that may prevent the powder from being discharged, and to take prompt countermeasures.

In addition, in the above-described embodiment, the case where the inventory amount is calculated for one storage tank 10 was taken as an example, but this is not the only option. For example, the inventory quantity calculation device 100 may be configured as a server device that integrates a plurality of storage tanks 10 via a network. 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 based on the acquired first distance l1 and the second distance l2 for each storage tank 10, The amount of powder in stock in each of the storage tanks 10 may be calculated.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments so shown and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

1 inventory calculation system 3 input unit 5 measurement unit 5a first displacement gauge 5b second displacement gauge 7 output unit 10 storage tank 11 silo unit 12 funnel unit 13 upper surface unit 13a opening 100 inventory calculation device 101 storage unit 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

a first displacement gauge provided in the upper part of the storage tank and capable of vertically measuring a first distance, which is the distance to the center of the surface of the powder contained in the storage tank, by means of a measurement wave;
a second displacement meter capable of measuring a second distance, which is a distance to the powder surface at a predetermined angle with respect to the vertical direction, by means of a measurement wave;
Based on the measurement result of the first displacement gauge, the measurement result of the second displacement gauge, and the type of powder stored in the storage tank, the powder including the case where the surface shape of the powder surface is a depressed shape An inventory amount calculation device, comprising: a calculation unit that calculates an inventory amount of bodies.
The calculation unit
The inventory amount calculation device according to claim 1, wherein the inventory amount of the powder is calculated based on the repose angle and depression diameter corresponding to the type of the powder.
When the first distance measured by the first displacement gauge and the distance from the first displacement gauge to the powder discharge port provided at the bottom of the storage tank are substantially equal, there is a risk that the inventory cannot be discharged. 2. The inventory amount calculation device according to claim 1, further comprising a detection unit that detects that a certain depression has occurred.
The calculation unit
The inventory amount calculation device according to claim 1, 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, wherein the inventory amount of the powder is calculated using a calculation formula corresponding to the type of the powder and the surface shape.
The calculation unit
Obtaining the first distance and the second distance for a plurality of the storage tanks, and calculating the inventory amount of the powder in each of the storage tanks based on the first distance and the second distance. The inventory amount calculation device according to claim 1.
The inventory quantity calculating device according to any one of claims 1 to 6, wherein the powder is feed containing mash.
a first displacement gauge provided on the top of a storage tank and capable of measuring a first distance, which is a distance to the center of the surface of the powder contained in the storage tank, in a vertical direction by means of a measurement wave; A method of calculating an inventory quantity executed by an inventory quantity calculating device having a second displacement gauge provided so as to be able to measure a second distance, which is a distance to the surface of the powder at a predetermined angle with respect to a direction, by means of a measuring wave. and
Based on the measurement result of the first displacement gauge, the measurement result of the second displacement gauge, and the type of powder stored in the storage tank, the powder including the case where the surface shape of the powder surface is a depressed shape An inventory amount calculation method, comprising: a calculation step of calculating an inventory amount of bodies.