阅读说明：本技术 一种新型在线料位检测装置及其使用方法 (Novel online material level detection device and using method thereof ) 是由 张玉鹏 朱敏涛 吴杰 周强 王宇 刘龙 董赛阳 马俐勇 戴志辉 于 2021-06-21 设计创作，主要内容包括：为了提高料仓料位的检测精度,避免扬尘对料位测量的影响,本发明提供一种新型在线料位检测装置及其使用方法。本发明的一种新型在线料位检测装置,包括设置于料仓内且沿料仓高度方向设置的至少两根导轨,所述导轨的下端与料仓的底部连接；所述导轨上间隔设置光感仪；各个导轨上处于同一水平面上的光感仪通过光线相互感应连接。本发明的一种新型在线料位检测装置,采用光感仪作为测量仪器,光感仪可在10m以上的距离内的扬尘或大雾环境下正常工作,因此,在料仓中,只要保证同一水平面上的各个光感仪在合适的距离内,就可以准确的检测出粉料的位置,从而计算出存料量,不会因为料仓内的扬尘环境而影响存料量的检测。(The invention provides a novel online material level detection device and a using method thereof, aiming at improving the detection precision of the material level of a storage bin and avoiding the influence of raised dust on material level measurement. The invention discloses a novel online material level detection device, which comprises at least two guide rails arranged in a bin and arranged along the height direction of the bin, wherein the lower ends of the guide rails are connected with the bottom of the bin; light sensors are arranged on the guide rail at intervals; the light sensors on the same horizontal plane on each guide rail are mutually connected in an inductive way through light rays. According to the novel online material level detection device, the light sensors are used as measuring instruments, and can normally work in a dust raising or heavy fog environment within a distance of more than 10m, so that in a storage bin, the position of powder can be accurately detected as long as the light sensors on the same horizontal plane are ensured within a proper distance, the storage amount is calculated, and the detection of the storage amount cannot be influenced by the dust raising environment in the storage bin.)

1. The novel online material level detection device is characterized by comprising at least two guide rails (1) which are arranged in a storage bin (a) and arranged along the height direction of the storage bin (a), wherein the lower ends of the guide rails (1) are connected with the bottom of the storage bin (a); the light sensors (3) are arranged on the guide rail (1) at intervals; the light sensors (3) on the same horizontal plane on each guide rail (1) are mutually connected in an inductive way through light.

2. A new type of on-line level gauge as claimed in claim 1, characterized in that said light sensor (3) comprises a plurality of light sensors (31); the light sensor (31) comprises a transmitting device (311), a receiving device (312) and a self-cleaning protective cover (313); the self-cleaning protective cover (313) is sleeved on the transmitting device (311) and the receiving device (312), the self-cleaning protective cover (313) is made of transparent resin materials, the radian of the arc surface is pi/3 rad, and fluorescent powder is added on the surface.

3. The novel on-line material level detecting device as claimed in claim 1, wherein the stock bin (a) is cylindrical, and the number of the guide rails (1) is two; the distance from a point formed by the projection of each guide rail (1) on the horizontal section of the storage bin (a) to the center of the horizontal section is half of the radius of the horizontal section.

4. The novel on-line material level detecting device as claimed in claim 1, wherein the bin (a) is cylindrical, and the number of the guide rails (1) is four; the distance from a point formed by the projection of each guide rail (1) on the horizontal section of the storage bin (a) to the center of the horizontal section is half of the radius of the horizontal section.

5. The novel online material level detecting device according to claim 1, wherein the bin (a) is cylindrical, and the number of the guide rails (1) is three; the distances from points formed by the projection of the guide rails (1) on the horizontal section of the storage bin (a) to the circle center of the horizontal section are different.

6. A novel on-line level detecting device as claimed in claim 1, further comprising a controller (4), wherein the controller (4) is in signal connection with each light sensor (3).

7. The novel online material level detecting device as claimed in claim 2, wherein the light emitted by the emitting device (311) is ultraviolet light, and the ultraviolet light is short wave with a wavelength of 100-280 nm.

8. The use method of the novel online level detecting device as claimed in claim 1, characterized by comprising the following steps:

s1, starting the light sensor (3);

s2, when the light sensors (3) on the same horizontal plane are immersed by the powder, the light sensors (3) on the horizontal plane cannot mutually sense, and the horizontal plane is set as a filling surface; when the light sensors (3) on the same horizontal plane are not immersed by the powder, the light sensors (3) on the horizontal plane are mutually induced, and the horizontal plane is set to be a material-free surface;

s3, taking a value between the height of the filling surface at the uppermost layer and the height of the non-material surface at the lowermost layer as the height of the material level of the storage bin (a);

and S4, calculating the stock quantity of the stock bin (a).

9. The use method of the novel online level detecting device as claimed in claim 8, wherein in S1, the light sensor (3) is activated layer by the controller (4).

10. The use method of the novel online material level detecting device according to claim 1, wherein the bin (a) is cylindrical with a radius of R, a recessed area (e) is formed on the upper surface of the powder (d) in the bin (a), the recessed area (e) is in an inverted cone shape, and the guide rail (1) comprises a first guide rail (11), a second guide rail (12) and a third guide rail (13); the distance L1 from a point formed by the projection of the first guide rail (11) on the horizontal section of the silo (a) to the center of the horizontal section is greater than the distance L2 from a point formed by the projection of the second guide rail (12) on the horizontal section of the silo (a) to the center of the horizontal section is greater than the distance L3 from a point formed by the projection of the third guide rail (13) on the horizontal section of the silo (a) to the center of the horizontal section;

the method comprises the following steps:

s1, starting the light sensor (3);

s2, when any one of the light sensors (3) on the first guide rail (11), the second guide rail (12) and the third guide rail (13) which are on the same horizontal plane is immersed by powder, the light sensors (3) on the horizontal plane cannot be completely mutually sensed, and the horizontal plane is set to be a first filling surface (b 1); when the light sensors (3) on the same horizontal plane on the first guide rail (11), the second guide rail (12) and the third guide rail (13) are not immersed by the powder, the light sensors (3) on the horizontal plane are mutually induced, and the horizontal plane is set to be a first non-material surface (c 1);

s3, taking a value between the height of the first filling level (b1) at the uppermost layer and the height of the first non-filling level (c1) at the lowermost layer as a first height H1;

s4, when any one of the light sensors (3) on the second guide rail (12) and the third guide rail (13) which are on the same horizontal plane is immersed by the powder, the light sensors (3) on the second guide rail (12) and the third guide rail (13) on the horizontal plane cannot mutually sense, and the horizontal plane is set to be a second filling surface (b 2); when the light sensors (3) on the second guide rail (12) and the third guide rail (13) which are positioned on the same horizontal plane are not completely immersed by the powder, the light sensors (3) on the second guide rail (12) and the third guide rail (13) on the horizontal plane are mutually induced, and the horizontal plane is set to be a second material-free surface (c 2);

s5, taking a value between the height of the second filling level (b2) at the uppermost layer and the height of the second filling level (c2) at the lowermost layer as a second height H2;

s6, calculating the volume V of the powder in the storage bin (a) as follows:

V＝[(H1-H2)/(L1-L2)*(R-L1)+H1]*πR²-(H1-H2)/(L1-L2)*R*(1/3)*πR²。

Technical Field

The invention belongs to the technical field of on-line detection of concrete production equipment, and particularly relates to a novel on-line material level detection device and a using method thereof.

Background

The concrete production equipment (concrete mixing plant) is an indispensable large-scale equipment in the concrete production process and mainly comprises a mixing host machine, a material weighing system, a material conveying system, a material storage system, a control system and other accessory facilities. In the process of concrete production, along with the use of a material storage system, namely a storage bin, the detection of the material level change has great significance.

At present, the traditional level gauge is generally a radar level gauge. But when depositing the powder in the feed bin, because the powder produces the raise dust easily at the in-process of feeding and ejection of compact, and the raise dust very easily causes the interference to radar level gauge to can cause the material level to detect the precision relatively poor, even unable detection. This not only affects the production schedule, but also affects the surrounding environment. The device is improved and created aiming at the real-time detection of the material level of the storage bin in the concrete production equipment, can achieve the aim of more accurate feeding and discharging, and can detect the state of the storage bin in real time.

Disclosure of Invention

The invention provides a novel online material level detection device and a using method thereof, aiming at improving the detection precision of the material level of a storage bin and avoiding the influence of raised dust on material level measurement.

The technical scheme of the novel online material level detection device is as follows:

a novel online material level detection device comprises at least two guide rails which are arranged in a storage bin and arranged along the height direction of the storage bin, wherein the lower ends of the guide rails are connected with the bottom of the storage bin; light sensors are arranged on the guide rail at intervals; the light sensors on the same horizontal plane on each guide rail are mutually connected in an inductive way through light rays.

According to the novel online material level detection device, when the material storage amount of the storage bin is detected, the light sensor is started at first; when the light sensors on the same horizontal plane are immersed by the powder, the light sensors on the horizontal plane cannot mutually sense, and the horizontal plane is set as a filling surface; when the light sensors on the same horizontal plane are not immersed by the powder, the light sensors on the horizontal plane are mutually induced, and the horizontal plane is set to be free of material level; taking a value between the height of the filling surface at the uppermost layer and the height of the material-free surface at the lowermost layer as the height of the material level of the storage bin; at this time, the stock quantity of the stock bin can be calculated. The precision of the material storage amount of the storage bin is related to the distance between the light sensors on the same guide rail, and the smaller the distance between the light sensors is, the higher the precision of the material storage amount is.

According to the novel online material level detection device, the light sensors are used as measuring instruments, and can normally work in a dust raising or heavy fog environment within a distance of more than 10m, so that in a storage bin, the position of powder can be accurately detected as long as the light sensors on the same horizontal plane are ensured within a proper distance, the storage amount is calculated, and the detection of the storage amount cannot be influenced by the dust raising environment in the storage bin.

Furthermore, in the novel online material level detection device, the light sensor comprises a plurality of light sensors; the light sensor comprises an emitting device, a receiving device and a self-cleaning protective cover; the self-cleaning protective cover is sleeved on the transmitting device and the receiving device and made of transparent resin materials, the radian of the arc surface is pi/3 rad, and fluorescent powder is added on the surface. Each light sensor is provided with enough light sensors which are arranged corresponding to the light sensors on the same horizontal plane on other guide rails. The corresponding light sensors transmit and receive light through the transmitting device and the receiving device. Taking a set of light sensors as an example, the light can be transmitted and received in a single direction or in two directions, as long as mutual induction can be formed between the two light sensors. In addition, in order to prevent the light sensor from being affected by the attachment of powder, a self-cleaning protective cover is arranged on the transmitting device and the receiving device. The self-cleaning protective cover is made of transparent resin materials, the radian of the arc surface is pi/3 rad, fluorescent powder is added on the surface, and the self-cleaning protective cover is non-conductive and smooth in surface. The design can prevent powder from being accumulated on the light sensor, thereby isolating the mutual attraction of ions and increasing the accuracy of the light sensor. The fluorescent powder can enhance optical signals, and the action effect is more obvious.

Furthermore, the bin of the novel online material level detection device is cylindrical, and the number of the guide rails is two; the distance from a point formed by the projection of each guide rail on the horizontal section of the storage bin to the circle center of the horizontal section is half of the radius of the horizontal section. Because the discharge gate of feed bin often sets up in the lower part of feed bin. After the bin discharges, powder in the bin can form a depressed area. The recessed area can cause errors in the metering of the silo. After the guide rails are arranged according to the positions, the material level detected by the novel online material level detection device is about half of the height of the depressed area. The powder above this height can compensate for the depression, thereby improving the accuracy of the measurement.

Furthermore, the bin of the novel online material level detection device is cylindrical, and the number of the guide rails is four; the distance from a point formed by the projection of each guide rail on the horizontal section of the storage bin to the circle center of the horizontal section is half of the radius of the horizontal section. After a plurality of guide rails are arranged in the storage bin, each light sensor can simultaneously correspond to the light sensors on other guide rails on the same horizontal plane and is used for receiving and transmitting signals to the maximum extent. When some light sensors break down, other all groups of light sensors can also work normally, so that the material level detection cannot be influenced.

Furthermore, the stock bin of the novel online material level detection device is cylindrical, and the number of the guide rails is three; the distances from points formed by the projections of the guide rails on the horizontal section of the storage bin to the circle center of the horizontal section are different. After each guide rail is arranged according to the position, the volume of the depressed area can be accurately calculated, so that the precision of material level measurement is further improved.

Furthermore, novel online material level detection device, still include the controller, the controller and each light sense appearance signal connection. The controller can control the light sensors on each horizontal plane to perform synchronous control, and layer-by-layer scanning of the storage bin is achieved.

Further, the light rays emitted by the emitting device are ultraviolet rays, and the ultraviolet rays are short waves with the wavelength of 100-280 nanometers. The light can penetrate through dust with certain density and cannot cause damage to human bodies.

The invention also provides a using method of the novel online material level detection device, and the technical scheme is as follows:

the use method of the novel online material level detection device comprises the following steps:

s1, starting the light sensor;

s2, when the light sensors on the same horizontal plane are immersed by the powder, the light sensors on the horizontal plane cannot mutually sense, and the horizontal plane is set as a filling surface; when the light sensors on the same horizontal plane are not immersed by the powder, the light sensors on the horizontal plane are mutually induced, and the horizontal plane is set to be free of material level;

s3, taking a value between the height of the uppermost layer of filling surface and the height of the lowermost layer of non-material surface as the height of the material level of the storage bin;

and S4, calculating the stock quantity of the stock bin.

According to the use method of the novel online material level detection device, the light sensors are used as measuring instruments and can normally work in a dust raising or fog environment within a distance of more than 10m, so that in a storage bin, the positions of powder can be accurately detected as long as the light sensors on the same horizontal plane are ensured within a proper distance, the material storage amount is calculated, and the detection of the material storage amount cannot be influenced by the dust raising environment in the storage bin.

Further, the use method of the novel online material level detection device is specifically that in S1, the light sensors are started layer by layer through the controller.

The invention also provides a using method of the novel online material level detection device, which adopts the technical scheme that:

the using method of the novel online material level detection device is characterized in that a bin is cylindrical, the radius of the bin is R, a concave area is formed on the upper surface of powder in the bin, the concave area is inverted cone-shaped, and the guide rail comprises a first guide rail, a second guide rail and a third guide rail; the distance L1 between a point formed by the projection of the first guide rail on the horizontal section of the storage bin and the center of the horizontal section, the distance L2 between a point formed by the projection of the second guide rail on the horizontal section of the storage bin and the center of the horizontal section, and the distance L3 between a point formed by the projection of the third guide rail on the horizontal section of the storage bin and the center of the horizontal section are included;

the method comprises the following steps:

s1, starting the light sensor;

s2, when any one of the light sensors on the first guide rail, the second guide rail and the third guide rail, which are positioned on the same horizontal plane, is immersed by the powder, the light sensors on the horizontal plane cannot be completely mutually sensed, and the horizontal plane is set as a first filling surface; when the light sensors on the same horizontal plane on the first guide rail, the second guide rail and the third guide rail are not completely immersed by the powder, the light sensors on the horizontal plane are mutually induced, and the horizontal plane is set as a first non-material surface;

s3, taking a value between the height of the first filling surface at the uppermost layer and the height of the first non-material surface at the lowermost layer as a first height H1;

s4, when any one of the light sensors on the second guide rail and the third guide rail, which are positioned on the same horizontal plane, is immersed by the powder, the light sensors on the second guide rail and the third guide rail on the horizontal plane cannot mutually sense, and the horizontal plane is set as a second filling surface; when the light sensors on the second guide rail and the third guide rail on the same horizontal plane are not completely immersed by the powder, the light sensors on the second guide rail and the third guide rail on the horizontal plane are mutually induced, and the horizontal plane is set as a second material-free surface;

s5, taking a value between the height of the second filling surface at the uppermost layer and the height of the second material-free surface at the lowermost layer as a second height H2;

s6, calculating the volume V of the powder in the storage bin as:

V＝[(H1-H2)/(L1-L2)*(R-L1)+H1]*πR²-(H1-H2)/(L1-L2)*R*(1/3)*πR²。

according to the application method of the novel online material level detection device, when the volume of powder is calculated, in order to simplify the calculation process, points formed by projection of each guide rail on the horizontal section of the storage bin can be moved to the same straight line under the condition that the distance from each guide rail to the circle center of the horizontal section is not changed. Since the ratio between (H1-H2) and (L1-L2) is the same as the ratio between the height of the recessed region and R, the height of the recessed region, and thus the volume of the recessed region, can be accurately calculated. In addition, the height of the powder above the first height H1 can be obtained through a proportional relation, so that the volume of the powder feeding bin at the highest position is determined. Finally, the two are subtracted, and the accurate volume of the powder in the storage bin can be obtained.

Drawings

FIG. 1 is a schematic view of a novel on-line level detecting device of the present invention;

FIG. 2 is a schematic view of a light sensor of the novel online level detecting device of the present invention;

FIG. 3 is a top view of a first novel online level detecting device of the present invention;

FIG. 4 is a top view of a second novel on-line level detecting device of the present invention;

FIG. 5 is a top plan view of a third novel online level detecting device of the present invention;

FIG. 6 is a schematic diagram of the calculation in the method of using the novel online level detecting device of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Example 1:

the embodiment provides a novel online material level detection device's technical scheme as follows:

referring to fig. 1, the novel online material level detecting device includes at least two guide rails 1 disposed in a bin a and arranged along a height direction of the bin a, wherein a lower end of each guide rail 1 is connected with a bottom of the bin a; the light sensors 3 are arranged on the guide rail 1 at intervals; the light sensors 3 on the same horizontal plane on each guide rail 1 are mutually connected by light induction.

In the novel online material level detection device of the embodiment, when the material storage amount of the bin a is detected, the light sensor 3 is started firstly; when the light sensors 3 on the same horizontal plane are immersed by the powder, the light sensors 3 on the horizontal plane cannot mutually sense, and the horizontal plane is set as a filling surface; when the light sensors 3 on the same horizontal plane are not immersed by the powder, the light sensors 3 on the horizontal plane are mutually induced, and the horizontal plane is set to be a material-free surface; taking a value between the height of the uppermost layer of the filling surface and the height of the lowermost layer of the material-free surface as the height of the material level of the storage bin a, wherein the value can be the height of the uppermost layer of the filling surface, the height of the lowermost layer of the material-free surface or the average value of the height of the uppermost layer of the filling surface and the height of the lowermost layer of the material-free surface; at this time, the stock amount of the stock bin a can be calculated. The accuracy of the stock quantity of the stock bin a is related to the distance between the light sensors 3 on the same guide rail 1, and the smaller the distance between the light sensors 3 is, the higher the accuracy of the stock quantity is.

The novel online material level detection device of this embodiment adopts light sense appearance 3 as measuring instrument, and light sense appearance 3 can be normal work under raise dust or the big fog environment in the distance more than 10m, consequently, in feed bin a, as long as guarantee each light sense appearance 3 on the same horizontal plane in suitable distance, the position that detects out the powder that just can be accurate to calculate the stock volume, can not influence the detection of stock volume because of the raise dust environment in the feed bin a.

Referring to fig. 2, as a preferred embodiment, in the novel online material level detecting device, the light sensor 3 includes a plurality of light sensors 31; the optical sensor 31 comprises an emitting device 311, a receiving device 312 and a self-cleaning protective cover 313; the self-cleaning protective cover 313 is sleeved on the emitting device 311 and the receiving device 312, the self-cleaning protective cover 313 is made of transparent resin materials, the radian of the arc surface is pi/3 rad, and fluorescent powder is added on the surface. Each light sensor 3 is provided with enough light sensors 31 to correspond to the light sensors 31 on the light sensors 3 on the same horizontal plane on the other guide rails 1. The corresponding light sensor 31 transmits and receives light through the transmitting device 311 and the receiving device 312. Taking a set of photo sensors 31 as an example, the light emission and reception can be unidirectional or bidirectional, as long as mutual induction can be formed between two photo sensors 31. In addition, in order to prevent the photo sensor 31 from being affected by the adhesion of powder, a self-cleaning shield 313 is provided on the emitting device 311 and the receiving device 312. The self-cleaning protective cover 313 is made of transparent resin materials, the radian of the arc surface is pi/3 rad, fluorescent powder is added on the surface, and the self-cleaning protective cover is non-conductive and smooth in surface. Such a design can prevent powder from being accumulated on the optical sensor 31, thereby isolating the mutual attraction of ions and increasing the accuracy of the optical sensor 31. The fluorescent powder can enhance optical signals, and the action effect is more obvious.

Referring to fig. 1 and 3, as a preferred embodiment, in the novel online material level detecting device, the bin a is cylindrical, and the number of the guide rails 1 is two; the distance from a point formed by the projection of each guide rail 1 on the horizontal section of the storage bin a to the center of the horizontal section is half of the radius of the horizontal section. The discharge port of the bin a is often arranged at the lower part of the bin a. After the bin a discharges, a concave area e is formed by the powder in the bin a. The recessed area e can cause errors in the metering of the silo a. After the guide rails 1 are arranged according to the positions, the material level detected by the novel online material level detection device is about half of the height of the depressed area e. The powder above this height can compensate for the depression e and thus improve the accuracy of the measurement.

Referring to fig. 1 and 4, as a preferred embodiment, in the novel online material level detecting device, the bin a is cylindrical, and the number of the guide rails 1 is four; the distance from a point formed by the projection of each guide rail 1 on the horizontal section of the storage bin a to the center of the horizontal section is half of the radius of the horizontal section. After a plurality of guide rails 1 are arranged in the silo a, each light sensor 31 can simultaneously correspond to the light sensors 31 on other guide rails 1 on the same horizontal plane, and is used for receiving and transmitting signals to the maximum extent. When some light sensors 31 are out of order, other groups of light sensors 31 can work normally, and the material level detection cannot be influenced.

Referring to fig. 5, as a preferred embodiment, in the novel online material level detecting device, the bin a is cylindrical, and the number of the guide rails 1 is three; the distances from points formed by the projection of the guide rails 1 on the horizontal section of the storage bin a to the center of the horizontal section are different. After the guide rails 1 are arranged according to the positions, the volume of the depressed area e can be accurately calculated, so that the accuracy of material level measurement is further improved.

Referring to fig. 1, as a preferred embodiment, the novel online material level detecting device further includes a controller 4, and the controller 4 is in signal connection with each light sensor 3. The controller 4 can control the light sensors 3 on each horizontal plane to perform synchronous control, so that the layer-by-layer scanning of the storage bin a is realized.

Referring to fig. 2, in a preferred embodiment, the light emitted from the emitting device (311) is ultraviolet light, and the ultraviolet light is short wave with a wavelength of 100 to 280 nm. The light can penetrate through dust with certain density and cannot cause damage to human bodies.

Example 2:

the embodiment provides a use method of the novel online material level detection device in the embodiment 1, and the technical scheme is as follows:

referring to fig. 1, a method for using a novel online material level detecting device comprises the following steps:

s1, starting the light sensor 3;

s2, when the light sensors 3 on the same horizontal plane are immersed by powder, the light sensors 3 on the horizontal plane cannot mutually sense, and the horizontal plane is set as a filling surface; when the light sensors 3 on the same horizontal plane are not immersed by the powder, the light sensors 3 on the horizontal plane are mutually induced, and the horizontal plane is set to be a material-free surface;

s3, taking a value between the height of the filling surface at the uppermost layer and the height of the non-material surface at the lowermost layer as the height of the material level of the storage bin a;

and S4, calculating the stock quantity of the stock bin a.

The use method of the novel online material level detection device of the embodiment adopts the light sensor 3 as a measuring instrument, and the light sensor 3 can normally work in a dust raising or fog environment within a distance of more than 10m, so that in the storage bin a, as long as each light sensor 3 on the same horizontal plane is ensured within a proper distance, the position of the powder can be accurately detected, the material storage amount is calculated, and the detection of the material storage amount cannot be influenced by the dust raising environment in the storage bin a.

Referring to fig. 1, as a preferred embodiment, the method for using the novel online material level detecting device, specifically, in S1, the light sensor 3 is activated layer by the controller 4.

Example 3:

the embodiment provides a use method of the novel online material level detection device in the embodiment 1, and the technical scheme is as follows:

referring to fig. 1, 5 and 6, in a using method of the novel online material level detecting device, a bin a is cylindrical with a radius R, a recessed area e is formed on the upper surface of powder d in the bin a, the recessed area e is in an inverted cone shape, and the guide rail 1 includes a first guide rail 11, a second guide rail 12 and a third guide rail 13; the distance L1 from the point formed by the projection of the first guide rail 11 on the horizontal section of the silo a to the center of the horizontal section is greater than the distance L2 from the point formed by the projection of the second guide rail 12 on the horizontal section of the silo a to the center of the horizontal section is greater than the distance L3 from the point formed by the projection of the third guide rail 13 on the horizontal section of the silo a to the center of the horizontal section;

the method comprises the following steps:

s1, starting the light sensor 3;

s2, when any one of the light sensors 3 on the first guide rail 11, the second guide rail 12 and the third guide rail 13 which are on the same horizontal plane is immersed by the powder, the light sensors 3 on the horizontal plane cannot all mutually sense, and the horizontal plane is set as a first filling surface b 1; when the light sensors 3 on the same horizontal plane on the first guide rail 11, the second guide rail 12 and the third guide rail 13 are not immersed by the powder, the light sensors 3 on the horizontal plane are mutually induced, and the horizontal plane is set as a first non-material surface c 1;

s3, taking a value between the height of the uppermost first filling level b1 and the height of the lowermost first non-filling level c1 as a first height H1;

s4, when any one of the light sensors 3 on the second guide rail 12 and the third guide rail 13, which are on the same horizontal plane, is immersed by the powder, the light sensors 3 on the second guide rail 12 and the third guide rail 13 on the horizontal plane cannot mutually sense, and the horizontal plane is set to be a second filling surface b 2; when the light sensors 3 on the second guide rail 12 and the third guide rail 13 on the same horizontal plane are not completely immersed by the powder, the light sensors 3 on the second guide rail 12 and the third guide rail 13 on the horizontal plane are mutually induced, and the horizontal plane is set as a second material-free surface c 2;

s5, taking a value between the height of the second filling surface b2 at the uppermost layer and the height of the second material-free surface c2 at the lowermost layer as a second height H2;

s6, calculating the volume V of the powder in the storage bin a as:

V＝[(H1-H2)/(L1-L2)*(R-L1)+H1]*πR²-(H1-H2)/(L1-L2)*R*(1/3)*πR²。

according to the using method of the novel online material level detection device, when the volume of powder is calculated, in order to simplify the calculation process, points formed by projection of each guide rail 1 on the horizontal section of the storage bin a can be moved to the same straight line under the condition that the distance from the guide rail to the circle center of the horizontal section is not changed. Since the ratio between (H1-H2) and (L1-L2) is the same as the ratio between the height of recessed area e and R, the height of recessed area e, and thus the volume of recessed area e, can be accurately calculated. In addition, the height of the powder above the first height H1 can be obtained through a proportional relation, so that the volume of the powder feeding bin a at the highest position is determined. Finally, the two are subtracted, and the accurate volume of the powder in the bin a can be obtained. If different geometrical structures exist at the lower part of the storage bin a, the calculation formula can be adjusted according to actual conditions.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.