Method and system for monitoring volume of materials in stock bin

Abstract

The invention provides a method and system for monitoring the material volume in a stock bin, the system for monitoring the material volume in the stock bin comprises a weighing device and a control unit, the weighing device is arranged according to the material pile form, the material pile volume is obtained according to the material weight on the weighing device and different material pile forms, the method is simple, the equipment investment is low, and the method is suitable for popularization and application. And the influence of the dust concentration in the stock bin is avoided.

Description

Technical Field

[0001] The present invention belongs to the field of mineral processing industry, and in particular relates to a method and system for monitoring the volume of materials in a silo. Background Art

[0002] In the process of mineral processing and production, especially in the crushing and screening of ore, mining enterprises set up semi-finished product silos, buffer silos in the crushing and screening workshop, and finished product silos in the factory area. In the segmented sand and gravel aggregate processing industry, there are multiple finished product silos according to the particle size of the materials; the finished product silos of some sand and gravel aggregate industries are linked to the corresponding sand and gravel terminals through long-distance belt conveyors, and land yards are also set up in the terminal area. Real-time monitoring of the volume of the stockpiles in each silo and yard is the basis for realizing intelligent scheduling in the mining field (especially the segmented sand and gravel aggregate field).

[0003] At present, most methods of measuring the volume of materials in silos are to use laser scanners to scan the outline and height of the pile, thereby calculating the volume of materials in the silo. However, when there is a lot of dust in the silo and visibility is low, the laser scanner is easily affected by the dust, resulting in inaccurate or impossible measurements. Taking northern my country as an example, due to water shortage, most mines adopt dry processing in the crushing and screening links. The silos are full of dust all year round, and visibility is low, which makes the laser scanner unable to play an effective role. In addition, laser scanners are expensive, which increases equipment costs. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for monitoring the volume of materials in a silo in view of the deficiencies in the prior art. The method is simple, the equipment investment is low, and it is not affected by the dust concentration in the silo.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for monitoring the volume of material in a silo, comprising:

[0007] Arrange the weighing device according to the storage form of the material pile in the silo; if the material pile is a conical pile with single-point unloading, set the weighing device directly below the center of the material pile; if the material pile is a strip pile with multiple-point unloading, set the weighing device directly below the material pile along the length direction;

[0008] Measure the weight M1 of the material in the upper part of the area S of the weighing device, and calculate the height H of the material pile according to the weight M1 of the material; the height H of the material pile is calculated by the following formula:

[0009]

[0010] The pile volume V2 is calculated according to the pile height H and the pile form;

[0011] When the pile is a conical pile with single-point unloading, the pile volume V2 is calculated by the following formula:

[0012]

[0013] When the pile is a strip pile with multiple unloading points, the pile volume V2 is calculated by the following formula:

[0014]

[0015] Among them, ρ is the material density, π is the pi, θ is the stacking angle of the pile, R = H / tanθ, and L is the length of the strip pile, that is, the center distance between the highest points at both ends of the strip pile.

[0016] The present invention arranges a weighing device according to the form of the material pile, and calculates the volume of the material pile by the weight of the material on the weighing device and the form of the material pile. The method is simple, the equipment investment is low, and it is not affected by the dust concentration in the silo.

[0017] Further, when the volume of the stockpile is less than a volume threshold, feeding is performed.

[0018] Furthermore, when the material pile is a strip pile with multi-point unloading, one or more weighing devices are arranged below the material pile along the length direction. When multiple weighing devices are arranged, the average value of the weights measured by the multiple weighing devices is taken as the material weight M1.

[0019] Based on the same inventive concept, the present invention also provides a system for monitoring the volume of materials in a silo, comprising: a weighing device and a control unit, wherein the weighing device is arranged at the bottom of the silo, and the weighing device is electrically connected to the control unit;

[0020] The weighing device measures the weight of the material above the area range of the weighing device and transmits the weight data to the control unit. The control unit calculates the volume of the material pile in the silo. The control unit controls the feeding and discharging of the silo. When the volume of the material pile in the silo is less than the volume threshold, feeding is carried out.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention arranges a weighing device according to the form of the material pile, and calculates the volume of the material pile by the weight of the material on the weighing device and the form of the material pile. The method is simple, the equipment investment is low, and it is not affected by the dust concentration in the silo. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a device for monitoring the volume of materials in a silo according to the present invention.

[0024] In the figure: 1- silo, 2- feeding belt conveyor, 3- material pile, 4- feeder, 5- discharging belt conveyor, 6- electronic scale, 7- control unit. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0026] Example

[0027] like Figure 1 A device for monitoring the volume of materials in a silo includes an electronic scale (weighing device) 6 and a control unit 7 (PLC control cabinet and computer). The electronic scale 6 located at the bottom of the silo weighs the weight of the material in the upper area of ​​the electronic scale, transmits the weight data to the PLC control cabinet, calculates the volume and weight of a pile of materials 3 in the silo, transmits the volume and weight data to the computer, and the computer receives and analyzes the data, such as comparing the volume of the pile of materials with a volume threshold, and controls the feeding belt conveyor 2, the feeder 4 and the discharging belt conveyor 5 of the silo through the PLC control cabinet.

[0028] The electronic scale 6 has a PLC interface and can be round or square. Its area S and the density ρ of the material need to be measured in advance. The weight of the material weighed by the electronic scale is the weight M1 of the material above the area S.

[0029] The PLC control cabinet is mainly used to receive the material weight M1 above the area S of the electronic scale 6, calculate the volume V1 above the area S of the electronic scale according to the known material density ρ, V1=M1 / ρ, calculate the material pile height H according to the formula V1=S×H, calculate the volume V2 and weight M2 of the entire material pile through the material pile height H, and then transmit them to the computer.

[0030] If the pile is a cone with single-point unloading, according to the cone volume formula, V2 = 1 / 3πR 2 H, where: π is the circumference of a circle, R is the radius of the conical pile, R = H / tanθ, θ is the stacking angle of the pile, and H is the calculated height of the pile. Therefore:

[0031]

[0032] If the pile is a strip pile with multiple unloading points, the length of the pile is L (the center distance between the highest points at both ends of the pile, the height H of the pile does not affect the L value), therefore:

[0033]

[0034] The computer receives the volume and weight data of the stockpile transmitted by the control cabinet.

[0035] Production preparation stage:

[0036] First, determine the storage form of the silo material (conical material pile with single-point unloading or strip material pile with multiple-point unloading). If it is a conical material pile with single-point unloading, the electronic scale is set directly below the center of the material pile; if it is a strip material pile with multiple-point unloading, the electronic scale is set directly below the center of the material pile along the length direction. Multiple electronic scales can be set at intervals. The smaller the spacing between the electronic scales and the greater the number, the greater the accuracy of the obtained material pile volume and weight. The average weight data measured by multiple electronic scales is taken to calculate the material pile height H. The material pile volume and material pile height are calculated based on the material pile form and formulas (1), (2), (3), and (4).

[0037] Production operation stage:

[0038] The weight of the material above the electronic scale using this device is monitored in real time, and the overall material pile volume and weight are calculated based on the material weight. The volume in the silo can be monitored as data support for intelligent scheduling. If there is a lack of material downstream, the discharge belt conveyor is controlled to discharge the material. If the volume of the material pile is less than the volume threshold, the volume of the material pile in the silo is too small to meet the downstream, that is, the feed end is controlled to feed. The volume threshold is determined based on the minimum demand for downstream materials, and the volume threshold is greater than or equal to the minimum demand for downstream materials.

[0039] The data can be fed back to the mine's existing intelligent scheduling system in real time, and linked with the scheduling system to provide data support for the intelligent scheduling of mine production and realize the intelligent scheduling of materials in the silo.

[0040] The device of this embodiment has a simple structure, a simple method, low equipment investment, strong operability, strong anti-interference ability, can monitor the volume of materials in the silo in real time, and is not affected by the dust concentration in the silo.

[0041] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

Claims

1. A method for monitoring the volume of material in a silo, It is characterized in that include: Arrange weighing devices according to the storage form of the material pile in the silo; if the material pile is a conical pile with single-point unloading, set the weighing device just below the center of the material pile; When the material pile is a strip pile with multiple unloading points, a weighing device is set just below the material pile along the length direction; Measure the weight M of the material in the upper part of the weighing device area S 1 , according to the material weight M 1 Calculate the material pile height H; the material pile height H is calculated by the following formula: The pile volume V is calculated based on the pile height H and the pile form 2 ; When the pile is a conical pile with single-point unloading, the pile volume V 2 Calculated by the following formula: When the pile is a strip pile with multiple unloading points, the pile volume V 2 Calculated by the following formula: Among them, ρ is the material density, π is the pi, θ is the stacking angle of the pile, R = H / tanθ, and L is the length of the strip pile, that is, the center distance between the highest points at both ends of the strip pile.

2. The method for monitoring the volume of material in a silo according to claim 1, It is characterized in that When the volume of the material pile in the silo is less than the volume threshold, feeding is carried out.

3. The method for monitoring the volume of material in a silo according to claim 1, It is characterized in that When the material pile is a strip pile with multiple unloading points, one or more weighing devices are set below the material pile along the length direction. When multiple weighing devices are set, the average weight measured by multiple weighing devices is taken as the material weight M. 1 .

4. A system for monitoring the volume of material in a silo, It is characterized in that include: A weighing device (6) and a control unit (7), wherein the weighing device (6) is arranged at the bottom of the silo (1), and the weighing device (6) is electrically connected to the control unit (7); The weighing device (6) measures the weight of the material above the area range of the weighing device (6) and transmits the weight data to the control unit (7). The control unit (8) calculates the volume of the material pile (3) in the silo. The control unit (7) controls the feeding and discharging of the silo. When the volume of the material pile in the silo is less than the volume threshold, the material is fed.

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