Powder bin material level detection device with self-cleaning function

Abstract

The utility model relates to the technical field of powder bin material level detection, in particular to a powder bin material level detection device with a self-cleaning function. Comprising a bin body, and a plurality of supporting legs are vertically fixed to the position, close to the edge, of the lower side wall of the bin body in an annular array. According to the cleaning device, in the process that the motor drives the rotating ring, the mounting frame, the sponge eraser and the filling mechanism to rotate synchronously, after a movable plate makes contact with a wedge block, the wedge block pushes the movable plate to move, so that cleaning liquid in the material storage tank falls into a flow dividing cavity through a folding groove and then flows into the sponge eraser through a plurality of through holes; after the moving plate is separated from the wedge block, the spring rebounds to push the moving plate to reset to the initial position, and the reset moving plate blocks a channel between the material storage tank and the through hole, so that intermittent filling of the cleaning liquid in the rotating process of the sponge eraser is realized, and the soaked sponge eraser effectively erases dust on the glass plate along with continuous rotation of the sponge eraser; and automatic cleaning of dust on the glass plate is achieved.

Description

Technical Field

[0001] This utility model relates to the field of powder silo level detection technology, specifically, to a powder silo level detection device with self-cleaning function. Background Technology

[0002] Powder silos are storage devices used by ready-mixed concrete companies to store powdered cementitious materials such as cement, fly ash, and mineral powder. Due to factors such as construction costs, equipment space layout, and material efficiency, the storage capacity of powder silos in ready-mixed concrete companies is generally around 200 tons. The powder silos are cylindrical with a conical bottom and are supported by several steel pipe columns fixed at the bottom. The steel pipe columns are connected by trusses to increase the stability of the structure.

[0003] As the main raw material for concrete production, the storage level of powder is crucial for concrete companies. If the material level in the silo is too low, production may be forced to stop due to insufficient raw materials. Conversely, if there is already a certain amount of material in the silo, overflow during the transfer of powder by trucks could lead to a serious environmental pollution incident. Both of these situations, occurring in the current ready-mixed concrete market, have a significant negative impact on production and operations. Therefore, it is essential to constantly monitor the material level in the powder silo to ensure normal production.

[0004] With the development of technology, many companies have adopted the method of installing piezoelectric chips on the steel pipe columns supporting the silos. By detecting the local compressive stress of the steel pipe columns through piezoelectric signals, the weight of the entire silo can be calculated, and a functional relationship between the pressure borne by the steel pipe columns and the material level in the silo can be established, forming an online detection device for the material level of powder silos.

[0005] However, the method of detecting material level using piezoelectric chips still has certain shortcomings:

[0006] First, there are drawbacks to the installation methods of piezoelectric chips: there are currently two main methods: one is to bind the piezoelectric chip to the surface of the steel pipe column, and the other is to implant the piezoelectric chip inside the steel pipe column. The former (surface binding) has a larger error in the perceived compressive stress data; while the latter (internal implantation) will weaken the cross section of the steel pipe column and affect its load-bearing capacity.

[0007] Second, the compressive stress distribution on the cross-section of the steel pipe column is uneven: Since the steel pipe column is distributed around the silo, it is subject to the gravitational torque of the material in the middle of the silo. The compressive stress on the inner side of the steel pipe column is relatively large, while that on the outer side is relatively small. Therefore, the method of calculating the overall load by multiplying the compressive stress value measured at a single point by the cross-sectional area of ​​the steel pipe will significantly reduce the accuracy of this online detection device.

[0008] Third, the material level distribution in the silo has dynamic characteristics: when feeding, due to the influence of the conical bottom, the material level is usually low in the middle and high around the edges; when feeding, it often presents a pattern of high in the middle and low around the edges; sometimes the overall material level is basically the same. In order to prevent material overflow (commonly known as "overflow"), it is necessary to accurately monitor the highest point of the material level, rather than the average point. Current piezoelectric chip detection measures cannot effectively identify and track this highest point. Utility Model Content

[0009] The purpose of this invention is to provide a powder silo level detection device with a self-cleaning function to solve the problems mentioned in the background art.

[0010] The piezoelectric chip material level detection method weakens the load-bearing capacity of the steel pipe column, and the accuracy of calculating the overall load based on single-point stress is low. At the same time, it cannot effectively detect the highest material level of powder inside the silo.

[0011] To address the above problems, the present invention aims to provide a powder silo level detection device with a self-cleaning function. The device includes a silo body. Several legs are vertically fixed in a circular array near the edge of the lower side wall of the silo body. A base is fixedly mounted at the lower end of each leg. A level detection mechanism is mounted on the base. The level detection mechanism includes a dust cover fixedly mounted on the side wall of the base and fitted over the outside of the legs. Four laser rangefinders with upward-facing emitters are fixedly installed on the bottom side inside the dust cover. The four laser rangefinders are arranged in a circular array around the legs. Two glass plates are fixedly mounted on the top of the dust cover. The glass plate is located directly above the laser rangefinder. A rotating ring is rotatably mounted on the top of the outer circumference of the dust cover. A mounting bracket, which is rotatably sleeved on the outside of the support leg, is fixedly mounted on the upper side wall of the rotating ring. Two sponge wipes are symmetrically fixed on the top side inside the mounting bracket. The lower side wall of the sponge wipes contacts the upper side wall of the glass plate. A filling mechanism is provided on the mounting bracket at a position corresponding to each sponge wipe. A drive mechanism is provided on the dust cover to drive the rotating ring to rotate. When the drive mechanism drives the rotating ring to rotate, the mounting bracket drives the sponge wipes and the filling mechanism to rotate synchronously, and the filling mechanism intermittently delivers cleaning fluid to the sponge wipes.

[0012] As a further improvement to this technical solution, the drive mechanism includes a motor fixedly installed on one side of the dust cover. The upper end of the output shaft of the motor is coaxially fixed with a drive gear via a spline. A number of tooth blocks are fixedly arranged in an annular array on the outer circumference of the rotating ring, and some of the tooth blocks mesh with the drive gear.

[0013] As a further improvement to this technical solution, a diversion cavity is provided on the upper side wall of the mounting bracket at the position corresponding to each sponge. Several through holes are arranged in a horizontal array at the bottom of the diversion cavity, and the through holes penetrate the bottom side wall of the diversion cavity.

[0014] As a further improvement to this technical solution, the filling mechanism includes a cover plate fixedly installed on the upper side wall of the mounting frame. The cover plate covers the upper side of the diversion cavity, and a storage tank is fixedly installed on the upper side wall of the cover plate. The storage tank is in communication with the interior of the diversion cavity.

[0015] As a further improvement to this technical solution, the filling mechanism also includes a horizontal frame that is fixedly installed at the bottom of the storage tank. The horizontal frame is connected to the interior of the storage tank, and a movable plate is slidably installed inside the horizontal frame. One end of the movable plate near the support leg axis extends to the outside of the horizontal frame.

[0016] As a further improvement to this technical solution, the filling mechanism also includes an external frame fixedly installed on the side of the horizontal frame away from the support leg axis. One end of the movable plate is horizontally fixedly provided with a sliding rod, and the other end of the sliding rod slides through the side wall of the external frame and extends outward. A spring is provided between the inner wall of the external frame and the movable plate, which is slidably sleeved on the sliding rod. The spring pushes the movable plate away from the external frame.

[0017] As a further improvement to this technical solution, the filling mechanism also includes a wedge block that is horizontally fixed on the outer wall of the support leg. One side of the wedge block is set as an inclined surface. When the mounting frame drives the two filling mechanisms to rotate, one end of the two moving plates extending out of the horizontal frame contacts the inclined surface of the wedge block during the movement.

[0018] As a further improvement to this technical solution, the movable plate is provided with a mating groove. When the movable plate contacts the wedge, the wedge pushes the movable plate away from the support leg axis, so that the mating groove is connected to the inside of the storage tank. When the movable plate and the wedge disengage, the spring pushes the movable plate to reset, so that the movable plate blocks the passage between the storage tank and the through hole.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This powder silo level detection device with self-cleaning function can calculate the true weight of the material inside the silo after the four laser rangefinders in the level detection mechanism measure the longitudinal strain data at four positions of the support legs. Based on the weight and density of the material inside the silo, the volume of the material can be calculated, and the height of the material inside the silo can be estimated. At the same time, by comparing the strain difference values ​​measured by several support legs, the center of gravity position of the entire silo can be analyzed. By comprehensively detecting the strain difference and the average strain at different positions of the support legs, the accumulation state of the powder inside the silo can be estimated, and the maximum material level of the powder can be estimated, thus avoiding the spillage accident when conveying materials into the silo.

[0021] 2. This powder silo level detection device with self-cleaning function, during the synchronous rotation of the motor-driven rotating ring, mounting frame, sponge wiper, and filling mechanism, after the moving plate contacts the wedge, the wedge pushes the moving plate to move, causing the cleaning liquid inside the storage tank to fall into the diversion chamber through the matching groove, and then flow into the sponge wiper through several through holes. When the moving plate disengages from the wedge, the spring rebounds and pushes the moving plate back to its initial position. The reset moving plate blocks the passage between the storage tank and the through holes, thus realizing the intermittent filling of cleaning liquid during the rotation of the sponge wiper. As the sponge wiper continues to rotate, it is fully soaked in cleaning liquid, and the soaked sponge wiper effectively removes dust from the glass plate, realizing automated cleaning of dust on the glass plate and avoiding dust affecting the monitoring accuracy of the laser rangefinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0024] Figure 3 For the present utility model Figure 2 A schematic diagram of the structure after the glass plate has been removed;

[0025] Figure 4 This is the second partial structural schematic diagram of the present utility model;

[0026] Figure 5 This is an exploded view of part of the structure of this utility model;

[0027] Figure 6 This is a cross-sectional view of the filling mechanism of this utility model.

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Body; 11. Support legs; 12. Base; 13. Wedge block;

[0030] 2. Material level detection mechanism; 21. Dust cover; 22. Glass plate; 23. Rotating ring; 231. Toothed block;

[0031] 24. Drive mechanism; 241. Motor; 242. Drive gear;

[0032] 25. Laser rangefinder;

[0033] 26. Mounting bracket; 261. Diverter cavity; 262. Through hole;

[0034] 27. Sponge eraser;

[0035] 28. Filling mechanism; 281. Cover plate; 282. Storage tank; 283. Horizontal frame; 284. Moving plate; 285. External frame; 286. Mating groove; 287. Slide rod; 288. Spring. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example 1

[0038] Please see Figure 1 As shown, the purpose of this embodiment is to provide a powder silo level detection device with self-cleaning function, including a silo body 1. The silo body 1 stores powdered cementitious materials such as cement, fly ash, and mineral powder. Several support legs 11 are vertically fixed in a circular array near the edge of the lower side wall of the silo body 1. The support legs 11 are steel pipe columns. A base 12 is fixedly installed at the lower end of the support legs 11. The base 12 is a square column structure made of concrete. The area of ​​the upper and lower side walls of the base 12 is larger than the area of ​​the outer diameter of the support legs 11, so that the support legs 11 can be stably installed on the base 12. The lower side wall of the base 12 touches the ground, thereby stably supporting the silo body 1 on the ground.

[0039] Each base 12 is equipped with a material level detection mechanism 2. Several material level detection mechanisms 2 work together to detect the material level height of the powder inside the silo 1. The structure of the material level detection mechanism 2 is described in detail below.

[0040] Reference Figure 2 and Figure 3 The material level detection mechanism 2 includes a dust cover 21 fixedly mounted on the upper side wall of the base 12 and sleeved on the outside of the support leg 11. Four laser rangefinders 25 with their emitting ends facing upwards are fixedly installed on the bottom side inside the dust cover 21. The laser rangefinders 25 are used to detect the distance between the emitting end and the lower side wall of the hopper 1. The four laser rangefinders 25 are arranged in a ring array around the support leg 11. Two glass plates 22 made of colorless transparent glass are fixedly installed on the top of the dust cover 21. The glass plates 22 are located directly above the laser rangefinders 25. The dust cover 21 and the glass plates 22 together form a closed space. The laser rangefinders 25 are installed inside this closed space. This structure can prevent dust from adhering to the emitting lens of the laser rangefinder 25, thereby ensuring its ranging accuracy.

[0041] Utilizing the linear elasticity of steel (within the proportional limit, stress and strain exhibit a strict proportional relationship), four laser rangefinders 25 measure the longitudinal strain data at four locations around the outrigger 11. According to Hooke's Law (stress = elastic modulus × strain data), substituting the material's elastic modulus and the detected longitudinal strain data near the outrigger 11, this scheme acquires four sets of longitudinal strain data near each outrigger 11. Stress is calculated for each of the four sets of data, and then the average value of the acquired stress data is calculated to determine the average stress at the corresponding cross-sectional location of the outrigger 11. The calculated average stress value is then multiplied by the cross-sectional area of ​​the outrigger 11. By summing the pressure values ​​calculated for all legs 11 at that position, the total weight of the material inside the entire silo 1 can be obtained (since the silo 1 is entirely supported by the legs 11, its total weight is entirely borne by all the legs 11). Therefore, the resultant force of the pressure on the legs 11 represents the true weight of the material inside the silo 1, with high accuracy (the accuracy can be further improved by increasing the number of laser rangefinders 25). Using the weight and density of the material inside the silo 1 (the density of the material needs to be dynamically corrected according to the actual ratio), the volume of the material can be calculated, and then the height of the material inside the silo 1 can be deduced.

[0042] Meanwhile, static equilibrium analysis shows that the higher the material level in the silo 1 (especially in the central area), the greater the compressive stress difference at different positions (e.g., inner and outer sides) of the support leg 11 cross-section. Therefore, the strain difference between different positions of the support leg 11 (since the stress difference and strain difference are linearly related) reflects the distribution of the material level in the silo 1. By comparing the strain difference values ​​measured by several support legs 11, the center of gravity position of the entire silo 1 can also be analyzed. By comprehensively detecting the strain difference and the average strain at different positions of the support leg 11, the accumulation state of the powder inside the silo 1 can be calculated, and the highest material level of the powder can be calculated. This can more effectively prevent material overflow accidents when conveying materials into the silo 1.

[0043] The calculation method is as follows:

[0044] A micro-element is selected at the center of the silo's cross-section. The volume of this micro-element is calculated, and its weight is then calculated based on the volume and the density of the material. The center of the support leg 11's cross-section is taken as the moment center. The moment of gravity generated by this micro-element is calculated based on the center's position. This moment of gravity causes bending deformation in support leg 11, and the bending moment is equal to the gravitational moment. Therefore, support leg 11 experiences strain superimposed on the outer side under tension and the inner side under compression. Since the cross-section of support leg 11 is annular, the tensile stress superimposed on the outer side is different from the compressive stress superimposed on the inner side. The values ​​of the tensile stress superimposed on the outer side and the compressive stress superimposed on the inner side are calculated, and the strain difference between the inner and outer sides is obtained by subtracting the compressive stress superimposed on the inner side from the tensile stress superimposed on the outer side.

[0045] By detecting the strain difference between the inside and outside of the support leg 11 and the average strain, the accumulation state of the powder inside the silo 1 can be calculated, and then the highest material level of the powder can be calculated, so as to more effectively avoid the overflow (overflow) accident when conveying materials into the powder silo.

[0046] To prevent dust from adhering to the upper sidewall of the glass plate 22 (which would cause the laser emitted by the laser rangefinder 25 to attenuate after penetrating the glass plate 22, affecting its ranging accuracy), a rotating ring 23 is rotatably installed at the top of the outer circumference of the dust cover 21. A mounting bracket 26, which is rotatably sleeved on the outside of the support leg 11, is fixedly installed on the upper sidewall of the rotating ring 23. Two sponge wipers 27 are symmetrically fixed on the top side inside the mounting bracket 26. The lower sidewall of the sponge wipers 27 contacts the upper sidewall of the glass plate 22, while simultaneously referencing… Figure 4 Each sponge 27 is provided with a filling mechanism 28 on the mounting frame 26. The dust cover 21 is provided with a drive mechanism 24 for driving the rotating ring 23 to rotate. When the drive mechanism 24 drives the rotating ring 23 to rotate, the mounting frame 26 drives the sponge 27 and the filling mechanism 28 to rotate synchronously. The filling mechanism 28 intermittently delivers cleaning fluid to the sponge 27. The sponge 27 is moistened with cleaning fluid. During the rotation process, the cleaning fluid-moistened sponge 27 can wipe away the dust on the glass plate 22, thereby maintaining the cleanliness of the glass plate 22.

[0047] The structure of the drive mechanism 24 is described in detail below, with reference to... Figure 3 The drive mechanism 24 includes a motor 241 fixedly mounted on one side of the dust cover 21. The motor 241 is a servo motor electrically connected to an external control device. The upper end of the output shaft of the motor 241 is coaxially fixed with a drive gear 242 via a spline. A number of tooth blocks 231 are fixedly arranged in an annular array on the outer circumference of the rotating ring 23. The number of tooth blocks 231 fixed on the rotating ring 23 forms an annular ring, in which some tooth blocks 231 mesh with the drive gear 242. In order to ensure normal meshing between the drive gear 242 and the tooth blocks 231, a protective cover can be used to mesh the drive gear 242 and the tooth blocks 231. The protective cover is designed to protect the meshing position of the drive gear 242 and the tooth block 231 from falling into the meshing position and affecting the normal use of the meshing position. The protective cover is not shown in the figure. This solution provides a protective cover shape, which is a cylindrical structure with the opening facing downward. It can be fixed to the edge of the upper side wall of the motor 241 so that it covers the top of the drive gear 242. The circumferential side wall of the protective cover has a notch at the position corresponding to the meshing position of the drive gear 242 and the tooth block 231. The meshing position of the drive gear 242 and the tooth block 231 is located inside the notch.

[0048] After the motor 241 starts, its output shaft drives the drive gear 242 to rotate slowly (the drive gear 242 rotates 10 times per minute). Through the meshing transmission between the drive gear 242 and the tooth block 231, the motor 241 drives the rotating ring 23 to rotate. The mounting bracket 26 then drives the sponge wiper 27 and the filling mechanism 28 to rotate synchronously. The dust on the glass plate 22 is wiped away by the sponge wiper 27.

[0049] Reference Figure 5 and Figure 6 A diversion cavity 261 is provided on the upper side wall of the mounting frame 26 at a position corresponding to each sponge 27. Several through holes 262 are horizontally arrayed at the bottom of the diversion cavity 261, penetrating the bottom side wall of the diversion cavity 261. The filling mechanism 28 includes a cover plate 281 fixedly mounted on the upper side wall of the mounting frame 26, covering the upper side of the diversion cavity 261. A storage tank 282 is fixedly mounted on the upper side wall of the cover plate 281, containing cleaning fluid. The storage tank 282 communicates with the interior of the diversion cavity 261. The filling mechanism 28 also includes a horizontal frame 283 horizontally fixedly mounted near the bottom of the storage tank 282, communicating with the interior of the storage tank 282. A movable plate 284 is slidably mounted inside the horizontal frame 283. The movable plate 284 is provided with a mating groove 286. One end of the movable plate 284 near the axis of the support leg 11 extends to the outside of the cross frame 283. The filling mechanism 28 also includes an external frame 285 fixedly installed on the side of the cross frame 283 away from the axis of the support leg 11. One end of the movable plate 284 is horizontally fixedly provided with a slide rod 287. The other end of the slide rod 287 slides through the side wall of the external frame 285 and extends outward. A spring 288 is provided between the inner wall of the external frame 285 and the movable plate 284 and is slidably sleeved on the slide rod 287. The spring 288 pushes the movable plate 284 away from the external frame 285. The filling mechanism 28 also includes a wedge 13 horizontally fixedly installed on the outer circumference of the support leg 11. The height of the wedge 13 corresponds to that of the movable plate 284, and one side of the wedge 13 is set as an inclined surface.

[0050] In the initial state, the mating groove 286 is not connected to the interior of the storage tank 282. The moving plate 284 blocks the passage between the storage tank 282 and the through hole 262, thereby preventing the cleaning fluid in the storage tank 282 from leaking.

[0051] When the mounting bracket 26 drives the two filling mechanisms 28 to rotate, one end of the two moving plates 284 extending out of the cross frame 283 contacts the inclined surface of the wedge block 13 during the movement. After the moving plate 284 contacts the wedge block 13, the wedge block 13 pushes the moving plate 284 away from the axis of the support leg 11, and the distance between the moving plate 284 and the external frame 285 is shortened. The spring 288 is compressed and stores energy. This movement connects the mating groove 286 with the interior of the storage tank 282. At this time, the cleaning liquid inside the storage tank 282 falls into the interior of the diversion chamber 261 through the mating groove 286, and then flows into the sponge 27 through several through holes 262. The sponge 27 absorbs the cleaning liquid and is fully soaked, thereby improving the cleaning effect of the sponge 27 on the dust on the glass plate 22.

[0052] When the moving plate 284 disengages from the wedge block 13, the spring 288 rebounds and pushes the moving plate 284 back to its initial position. After resetting, the moving plate 284 blocks the passage between the storage tank 282 and the through hole 262, preventing the cleaning fluid inside the storage tank 282 from continuing to drain. This achieves intermittent filling of cleaning fluid during the rotation of the sponge 27, ensuring that the cleaning fluid is fully utilized and avoiding waste.

[0053] When this device is in use, after the four laser rangefinders 25 in each material level detection mechanism 2 measure the longitudinal strain data at the four positions of the corresponding support legs 11, the true weight of the material in the silo 1 is calculated. Based on the weight and density of the material inside the silo 1, the volume of the material can be calculated, and then the height of the material inside the silo 1 can be estimated. At the same time, by comparing the strain difference values ​​measured by several support legs 11, the center of gravity position of the entire silo 1 is analyzed. By comprehensively detecting the strain difference and the average strain at different positions of the support legs 11, the accumulation state of the powder inside the silo 1 can be estimated, and then the highest material level of the powder can be estimated, so as to avoid the overflow accident when conveying materials into the silo 1.

[0054] When it is necessary to clean the dust on the glass plate 22, the start motor 241 drives the rotating ring 23, mounting bracket 26, sponge 27 and filling mechanism 28 to rotate synchronously. When one end of the moving plate 284 extending out of the horizontal frame 283 contacts the inclined surface of the wedge block 13, the wedge block 13 pushes the moving plate 284 away from the axis of the support leg 11, the distance between the moving plate 284 and the external frame 285 shortens, and the spring 288 is compressed and stores energy. This movement connects the mating groove 286 with the interior of the storage tank 282. At this time, the cleaning fluid inside the storage tank 282 falls into the interior of the diversion chamber 261 through the mating groove 286. The liquid then flows into the sponge 27 through several through holes 262. When the moving plate 284 disengages from the wedge block 13, the spring 288 rebounds and pushes the moving plate 284 back to its initial position. The reset moving plate 284 blocks the passage between the storage tank 282 and the through holes 262, preventing the cleaning liquid inside the storage tank 282 from continuing to drain. This achieves intermittent filling of cleaning liquid into the sponge 27 during rotation. As the sponge 27 continues to rotate, it will be fully soaked in cleaning liquid, and the cleaning liquid-soaked sponge 27 will thoroughly wipe away the dust on the glass plate 22.

[0055] After the cleaning work is completed, the control equipment first shuts down the motor 241 and causes its output shaft to drive the mounting bracket 26 and the filling mechanism 28 to rotate to a predetermined position. At this predetermined position, the mounting bracket 26 will not block the laser emitted by the laser rangefinder 25, so as to ensure that the laser rangefinder 25 can continuously monitor the material level of the powder inside the silo 1. At the same time, the moving plate 284 will not contact the wedge block 13, thereby maintaining its state of blocking the passage between the storage tank 282 and the through hole 262, and preventing the cleaning liquid in the storage tank 282 from leaking.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A powder silo level detection device with self-cleaning function, comprising a silo body (1), wherein a plurality of support legs (11) are vertically fixed in a circular array near the edge of the lower side wall of the silo body (1), and a base (12) is fixedly provided at the lower end of the support legs (11), characterized in that: A material level detection mechanism (2) is provided on the base (12). The material level detection mechanism (2) includes a dust cover (21) fixedly installed on the upper side wall of the base (12) and sleeved on the outside of the support leg (11). Four laser rangefinders (25) with their emitting ends facing upwards are fixedly installed on the bottom side inside the dust cover (21). The four laser rangefinders (25) are arranged in a ring array around the support leg (11). Two glass plates (22) are fixedly installed on the top of the dust cover (21). The glass plates (22) are located directly above the laser rangefinders (25). A rotating ring (23) is rotatably installed on the top of the outer circumference of the dust cover (21). The upper side wall of the rotating ring (23) is fixedly installed with... There is a mounting bracket (26) that is rotatably mounted on the outside of the support leg (11). Two sponge wipes (27) are symmetrically fixed on the top side inside the mounting bracket (26). The lower side wall of the sponge wipes (27) is in contact with the upper side wall of the glass plate (22). A filling mechanism (28) is provided on the mounting bracket (26) at the position corresponding to each sponge wipe (27). A drive mechanism (24) for driving the rotating ring (23) to rotate is provided on the dust cover (21). When the drive mechanism (24) drives the rotating ring (23) to rotate, the mounting bracket (26) drives the sponge wipes (27) and the filling mechanism (28) to rotate synchronously, and the filling mechanism (28) intermittently delivers cleaning fluid to the sponge wipes (27).

2. The powder silo level detection device with self-cleaning function according to claim 1, characterized in that: The drive mechanism (24) includes a motor (241) fixedly installed on one side of the dust cover (21). The upper end of the output shaft of the motor (241) is coaxially fixed with a drive gear (242) via a spline. A number of tooth blocks (231) are fixedly arranged in an annular array on the outer circumference of the rotating ring (23). Some of the tooth blocks (231) mesh with the drive gear (242).

3. The powder silo level detection device with self-cleaning function according to claim 1, characterized in that: The mounting bracket (26) has a diversion cavity (261) on the upper side wall corresponding to each sponge (27). The bottom of the diversion cavity (261) has a number of through holes (262) arranged in a horizontal array. The through holes (262) penetrate the bottom side wall of the diversion cavity (261).

4. The powder silo level detection device with self-cleaning function according to claim 3, characterized in that: The filling mechanism (28) includes a cover plate (281) fixedly installed on the upper side wall of the mounting frame (26). The cover plate (281) covers the upper side of the diversion cavity (261). A storage tank (282) is fixedly installed on the upper side wall of the cover plate (281). The storage tank (282) is in communication with the interior of the diversion cavity (261).

5. The powder silo level detection device with self-cleaning function according to claim 4, characterized in that: The filling mechanism (28) also includes a horizontal frame (283) that is fixedly arranged at the bottom of the storage tank (282). The horizontal frame (283) is connected to the interior of the storage tank (282). A movable plate (284) is slidably arranged inside the horizontal frame (283). One end of the movable plate (284) near the axis of the support leg (11) extends to the outside of the horizontal frame (283).

6. The powder silo level detection device with self-cleaning function according to claim 5, characterized in that: The filling mechanism (28) also includes an external frame (285) fixedly installed on the side of the cross frame (283) away from the axis of the support leg (11). One end of the movable plate (284) is horizontally fixed with a slide rod (287). The other end of the slide rod (287) slides through the side wall of the external frame (285) and extends outward. A spring (288) is provided between the inner wall of the external frame (285) and the movable plate (284) and is slidably sleeved on the slide rod (287). The spring (288) pushes the movable plate (284) away from the external frame (285).

7. The powder silo level detection device with self-cleaning function according to claim 5, characterized in that: The filling mechanism (28) also includes a wedge (13) that is horizontally fixed on the outer wall of the circumference of the support leg (11). One side of the wedge (13) is set as an inclined surface. When the mounting frame (26) drives the two filling mechanisms (28) to rotate, one end of the two moving plates (284) extending out of the cross frame (283) contacts the inclined surface of the wedge (13) during the movement.

8. The powder silo level detection device with self-cleaning function according to claim 7, characterized in that: The movable plate (284) is provided with a mating groove (286). When the movable plate (284) contacts the wedge (13), the wedge (13) pushes the movable plate (284) away from the axis of the support leg (11), so that the mating groove (286) communicates with the interior of the storage tank (282). When the movable plate (284) and the wedge (13) are disengaged, the spring (288) pushes the movable plate (284) to reset, so that the movable plate (284) blocks the passage between the storage tank (282) and the through hole (262).

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