Material level detection device, material bin and material level detection system of material bin

Abstract

The present invention provides a material level detection device, a silo and a material level detection system for the silo, and relates to the technical field of material level detection of high-temperature materials. The material level spiral comprises a motor, a screw shaft and a housing, the screw shaft has a screw shaft section one, a screw shaft section two and a screw shaft section three that are fixedly connected in sequence, the screw shaft section one is provided with a spiral blade along the direction of the screw axis, a material baffle plate is provided between the screw shaft section one and the screw shaft section two, the screw shaft section one and the screw shaft section two are arranged in the housing, and the power output end of the motor is connected to the screw shaft section three of the screw shaft through a coupling. The present invention adopts a spiral as a device for material level monitoring, which can meet the high temperature environment of 450-800℃, and there is no need to worry about the problem of coal tar precipitation and coal powder interference. Since the material level spiral is always in a forward and reverse state, the position of the material can be quickly determined by the change of the current, which fundamentally solves the problem of false alarm and missed alarm.

Description

Technical Field

[0001] The present invention relates to the technical field of material level detection of high-temperature materials, and in particular to a material level detection device, a material bin and a material level detection system of the material bin. Background Art

[0002] After pyrolysis, the coal material needs to be cooled and transferred in the silo. The material temperature before cooling is as high as about 750℃. At the same time, the silo is often connected to coal gas, which inevitably contains dust, oil and gas. Conventional material detection technologies such as heavy hammer detection, broadcast radar, laser, microwave, rotary resistance, and shift resistance detection cannot meet the material level detection of coal pyrolysis materials. The current detection technology cannot meet the material height detection under high temperature conditions above 100℃, nor can it meet the normal detection of material height when the coal tar precipitates and the coal powder environment causes jamming; there are problems such as extremely high false alarm rate. The current production process relies entirely on the experience and judgment of the post workers, lacking accuracy and safety.

[0003] Chinese patent application publication number CN101354280A discloses a device for measuring the material level of a hopper of a dry coke quenching primary dust collector. The thermocouple is inserted into the matching hole of a special-shaped mullite brick through a sleeve, and the temperature difference between the sleeve and the special-shaped mullite brick is detected by the thermocouple. This method has the problem of relatively slow or delayed measurement of the internal temperature. Its temperature measuring element is set on the side wall of the hopper, and the collected temperature data cannot better reflect the actual material temperature. There will be a large error after calculation, resulting in inaccuracy or even false alarm, affecting the operation process and equipment operation.

[0004] Chinese patent application publication number CN107505022A discloses a high-temperature material position detection device and method. A series of thermocouples of different lengths are arranged on the top of the silo, and a PLC control system is used to determine the position of the material based on the temperature difference collected by the thermocouples. In actual use, due to the characteristics of the thermocouples themselves, this solution has a slow response problem and cannot quickly determine the position of the material. As the use time increases, especially after being used for a period of time in a high temperature, dusty and oil and gas environment, coal or dust will inevitably adhere to the surface of the thermocouple, further slowing down the response speed and even causing false alarms.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to provide a material level detection device, a material bin and a material level detection system for the material bin.

[0007] The present invention is achieved in that:

[0008] The present invention provides a material level detection device, which includes a material level spiral, which includes a motor, a spiral shaft and a housing, the spiral shaft has a spiral shaft section one, a spiral shaft section two and a spiral shaft section three which are fixedly connected in sequence, the spiral shaft section one is provided with a spiral blade along the spiral axis direction, a material baffle plate is provided between the spiral shaft section one and the spiral shaft section two to prevent the material from entering the spiral shaft section two from the spiral shaft section one, the spiral shaft section one and the spiral shaft section two are provided in the housing, and the power output end of the motor is connected to the spiral shaft section three of the spiral shaft through a coupling. A notch is provided at one end of the housing away from the spiral shaft section three to satisfy the material falling into the chamber formed by the spiral shaft section one, the housing and the material baffle plate.

[0009] The material baffle is used to prevent the material from entering the second section of the screw shaft from the first section. When in use, the material is sent out by rotating the material level screw forward and reversely with the help of the material baffle, so as to continuously detect the material level in the silo.

[0010] The material of the baffle plate can be a high temperature resistant and corrosion resistant material, such as 3010s stainless steel or 15CrMoR steel. The thickness of the baffle plate can be adaptively adjusted as needed, such as 10-1000mm.

[0011] In one embodiment, the material level screw is electrically connected to an external frequency converter via a motor, and the voltage and frequency of the output power supply are adjusted by the frequency converter to achieve control and real-time detection of the motor working power supply frequency.

[0012] It should be noted that the second and third sections of the spiral shaft are not provided with spiral blades along the spiral axis direction and are through shafts.

[0013] As long as the above-mentioned spiral blades can meet the requirements of material transmission, the thickness, spiral angle and selected material of the spiral blades can be adaptively adjusted according to production needs, and a commercially available spiral shaft can also be used to directly replace the spiral shaft in this application.

[0014] Furthermore, the material of the screw machine casing is high temperature resistant and corrosion resistant material.

[0015] Preferably, the material of the screw machine housing is 3010s stainless steel or 15CrMoR steel.

[0016] In a preferred embodiment of the present invention, the three sections of the spiral shaft and the coupling are arranged in a connecting sleeve; the connecting sleeve includes a connecting sleeve one and a connecting sleeve two that are fixedly connected, one end of the connecting sleeve one is fixedly connected to the shell, and one end of the connecting sleeve two is fixedly connected to the outer shell of the motor.

[0017] The connecting sleeve is installed to protect the coupling and the three sections of the spiral shaft from high temperature and dust, and reduce equipment failure. It should be noted that the shape of the connecting sleeve can be a cylinder, a platform, an irregular diameter reducing platform, etc.

[0018] The shapes of the connecting sleeve 1 and the connecting sleeve 2 can be the same or different, and can be adaptively adjusted according to needs.

[0019] In one embodiment, the housing is cylindrical, and when installed, the housing penetrates the silo wall and is fixedly connected to the silo wall, and the motor end close to the material level screw is connected to the connecting sleeve 1, the connecting sleeve 2 and the motor in sequence through bolts. In other embodiments, the connecting sleeve 1 and the connecting sleeve 2 can also be fixedly connected by welding or other methods.

[0020] In a preferred embodiment of the present invention, the annular cavity formed by the second section of the spiral shaft, the housing and the baffle plate is filled with a heat insulation layer, and a gap is left between the heat insulation layer and the second section of the spiral shaft. The first section of the spiral shaft is welded with a spiral blade along the spiral axis direction. In other embodiments, the spiral blades can also be welded on the spiral shaft after the spiral shaft is purchased.

[0021] The thermal insulation layer is composed of thermal insulation materials, which are hardened and matched with the spiral shaft through a clearance. It should be noted that the purpose of filling the thermal insulation layer is to isolate heat as much as possible, reduce heat transfer, and protect the heat-sensitive assembly parts in the material level spiral outside the silo. Hardening the thermal insulation material can avoid contact between the spiral shaft and the thermal insulation layer, which is beneficial to prolonging the service life of the thermal insulation material. Especially during operation, the spiral shaft is always in a high-speed rotating state. Setting a clearance fit is beneficial to greatly prolong the service life of the thermal insulation layer and avoid frequent disassembly and replacement of the thermal insulation layer.

[0022] In one embodiment, the baffle plate is an annular baffle plate, and the outer edge of the baffle plate is fixedly connected to the housing (to prevent the baffle plate from moving up and down or left and right to affect the barrier performance of the material), and the inner edge diameter of the baffle plate is larger than the diameter of the through shaft of the screw shaft. This arrangement facilitates the baffle plate to be sleeved on the through shaft of the screw shaft.

[0023] In a preferred embodiment of the present invention, a notch is provided at one end of the housing away from the three sections of the screw shaft to allow the material to fall into the chamber formed by the first section of the screw shaft, the housing and the baffle plate. Compared with a cylindrical screw machine housing, such a setting is more convenient for material removal and material level detection. It should be noted that the size of the notch is based on the size of the notch to allow the material to fall into the chamber formed by the first section of the screw shaft, the housing and the baffle plate. In actual applications, a larger or smaller notch can be cut as needed to allow the material to be delivered. The notch can be one or more.

[0024] The present invention provides a material level detection system for a silo, which comprises a material level detection device, a material distribution device and a frequency converter; the frequency converter is electrically connected to a motor of the material level detection device; in one embodiment, the material distribution device comprises a main material distribution spiral and an auxiliary material distribution spiral.

[0025] It should be noted that the material distribution device in the above-mentioned material level detection system can be replaced by a commercially available material distribution device and is not limited to the above-mentioned main material distribution spiral and auxiliary material distribution spiral. As long as the uniform distribution of the material can be achieved, it is within the scope of the inventive concept of the present invention.

[0026] The present invention provides a material bin, which includes a material level detection device, a material distribution device and a frequency converter, wherein the material level detection device is spatially arranged below the material distribution device, the material distribution device is arranged in the material bin, the motor of the material level detection device is arranged outside the material bin, and the spiral shaft of the material level detection device extends into the material bin. The frequency converter is electrically connected to the motor of the material level detection device.

[0027] The purpose of spatially arranging the material level detection device below the material distribution device is to realize the position detection of the material.

[0028] In order to prevent dust from entering the motor and facilitate maintenance and disassembly, the motor is located outside the silo. The spiral shaft of the level detection device extends into the silo to meet the material level detection.

[0029] In a preferred embodiment of the present invention, the material level detection device comprises at least one material level spiral. When there are multiple material level spirals, the material level spirals are evenly distributed on both sides of the silo or located on the same side of the silo; and the material level spirals are arranged in at least one layer in the silo.

[0030] It should be noted that the material level detection device may include only one material level screw, or multiple material level screws may be provided according to the material feeding amount requirement and the test accuracy requirement.

[0031] To prevent uneven material distribution, multiple material level spirals can be arranged around the silo to achieve material level detection on the same horizontal line or on different horizontal lines. For example, multiple material level spirals can be evenly distributed around the silo, and one or more material level spirals can be arranged on the same layer or on different layers.

[0032] The number of layers can be one, two, three, four or at least five, and can be arranged according to the needs of material level detection.

[0033] In other embodiments, the material level screws may be located on the same side of the silo to achieve material level detection at different heights.

[0034] In a preferred embodiment of the present invention, the above-mentioned distribution device includes a main distribution spiral and an auxiliary distribution spiral. In the height direction of the silo, the main distribution spiral and the auxiliary distribution spiral are spatially cross-distributed, and the installation position of the main distribution spiral is higher than the installation position of the auxiliary distribution spiral; the number of the main distribution spiral is at least one, the number of the auxiliary distribution spiral is at least two, and the multiple auxiliary distribution spirals are arranged in parallel; the material level spiral is arranged between two adjacent auxiliary distribution spirals.

[0035] And at the height of the silo, the spiral axis of the material level spiral is 10-50mm lower than the spiral axis of the auxiliary material distribution spiral.

[0036] In order to prevent the materials from being concentrated and piled up at a certain position in the silo, the main feeding spiral and the auxiliary feeding spiral are arranged to be cross-distributed in space to ensure uniform feeding. The coordinated feeding of the main feeding spiral and the auxiliary feeding spiral is conducive to the uniform distribution of the materials. In the implementation method, the number, length, spacing, rotation speed and pitch of the main feeding spiral and the auxiliary feeding spiral can be selected according to the material feeding requirements. In one embodiment, the main feeding spiral and the auxiliary feeding spiral are arranged to be vertically distributed in space to ensure uniform feeding.

[0037] At the same time, in order to avoid inaccurate position measurement or unrepresentative local material level height, the material level spiral is specially arranged between two adjacent auxiliary material distribution spirals to prevent the falling material from directly hitting the material level spiral, causing current changes and causing false alarms.

[0038] For example, the spiral axis of the material level spiral is 10 mm, 20 mm, 30 mm or 50 mm lower than the spiral axis of the auxiliary material distribution spiral. In the actual implementation, adaptive selection can be made according to the measurement requirements of the material level.

[0039] In one embodiment, at the height of the silo, the bottom of the spiral blade of the main material distribution spiral is 10-100 mm higher than the top of the spiral blade of the auxiliary material distribution spiral, for example, 10 mm, 20 mm, 30 mm, 50 mm, 60 mm, 70 mm, 80 mm or 90 mm.

[0040] In a preferred embodiment of the present invention, the material level spirals are arranged in two layers in the silo, wherein the spiral axis of the upper material level spiral is 10-50 mm lower than the spiral axis of the auxiliary material distribution spiral, and the spiral axis of the lower material level spiral is 500-1000 mm lower than the spiral axis of the upper material level spiral.

[0041] In addition, in other embodiments, the heights of the spiral axes of the upper and lower material level spirals can be adaptively adjusted according to actual needs.

[0042] In one embodiment, the material level screws are arranged on both sides of the silo or on the same side of the silo.

[0043] In a preferred embodiment of the present invention, a feed port is provided at the top of the above-mentioned silo, and a discharge port is provided at the bottom of the silo. When the feed port is provided at the middle position of the top of the silo, the main material distribution spiral is located below the feed port, and at least one main material distribution spiral is provided on each side of the discharge axis of the silo; when the feed port deviates from the center position of the top of the silo, the number of main material distribution spirals is one.

[0044] In one embodiment, the main material distribution spiral and the auxiliary material distribution spiral are through-shaft spirals or cantilever spirals. The advantage of using a cantilever spiral is that after a single material level spiral detects the material, the adjacent auxiliary material distribution spiral can be adjusted in speed independently, which is more conducive to the uniform distribution of the material.

[0045] A method for material level detection or material distribution using the above-mentioned material bin includes determining the material level height by the current change of the material level screw, adjusting the speed of the material distribution device and the direction of the material level screw to achieve continuous monitoring of the material level. The current change of the material level screw is controlled and detected by a frequency converter.

[0046] Its working principle is as follows: when the material does not reach the height of the material level spiral, the material level spiral runs without load. At this time, it can be considered that the current of the material level spiral motor is stable and constant. When the material reaches the height of the material level spiral, the material is brought into the screw machine housing by the screw shaft. Due to the effect of the material baffle, when the material accumulates to a certain amount, the load becomes larger, and the current of the material level spiral motor increases significantly. By monitoring the current change, it can be determined that the material level in the silo has reached the installation height of the material level spiral. Through electrical interlocking control, reducing the speed of the auxiliary material feeding spiral can reduce the height of the material in the silo. At the same time, the motor of the material level spiral reverses, and after the material in the screw machine housing is discharged, the motor of the material level spiral rotates forward again to continue monitoring the material level. This cycle is repeated, and the height of the material level can be continuously monitored to achieve the purpose of controlling the material level height.

[0047] As an optional solution, the material level spiral can be set in a single layer or in a combination of high and low layers. The difference is that when the high and low layers are set, the low-layer material level spiral can detect the material first, and through the electrical interlocking control, the auxiliary material distribution spiral can be pre-slowed down. When the high-layer material level spiral also detects the material, the auxiliary material distribution spiral can be further slowed down. Compared with only setting a single-layer material level spiral, the high and low-layer material level spiral setting is more conducive to achieving a smooth transition of the auxiliary material distribution spiral speed, so that the speed will not fluctuate too much.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The present invention adopts a spiral as a material level monitoring device, which can meet the high temperature environment of 450-800°C and does not need to worry about the problems of coal tar precipitation and coal powder interference. Since the material level spiral is always in a forward and reverse rotation state, the position of the material can be quickly determined by the change of current, which fundamentally solves the problems of false alarm and missed alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 A schematic diagram of the structure of the material level spiral provided by the present invention;

[0052] Figure 2 This is a front view of Embodiment 1 of the present invention;

[0053] Figure 3 This is a front view of Embodiment 2 of the present invention;

[0054] Figure 4 It is a top view of Example 1 and Example 2 of the present invention;

[0055] Figure 5 This is a front view of Embodiment 3 of the present invention;

[0056] Figure 6 is a top view of embodiment 3 of the present invention;

[0057] Figure 7 This is a front view of Embodiment 4 of the present invention;

[0058] Figure 8 It is a top view of embodiment 4 of the present invention.

[0059] Icons: 1- silo; 11- silo wall; 12- feed port; 13- discharge port; 2- main material distribution spiral; 21- main material distribution spiral blade; 3- material level spiral; 301- material level spiral motor; 302- coupling; 303- spiral shaft; 3031- spiral shaft section one; 3032- spiral shaft section two; 3033- spiral shaft section three; 304- screw machine housing; 305- material baffle plate; 306- heat insulation layer; 307- connecting sleeve one; 308- connecting sleeve two; 4- auxiliary material distribution spiral; 41- auxiliary material distribution spiral blade. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0064] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0065] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] Reference Figures 2 to 8As shown, the present invention provides a high-temperature closed silo, which includes a material level detection device, which can realize continuous detection of material distribution and material level.

[0067] Specifically, refer to Figure 2 As shown, the high temperature closed silo includes a silo 1, a feed port 12, a discharge port 13, a material level screw 3, a material distribution device and a frequency converter (not shown in the figure, externally arranged outside the silo 1).

[0068] The material distribution device includes a main material distribution spiral 2 and an auxiliary material distribution spiral 4. The main material distribution spiral 2 and the auxiliary material distribution spiral 4 are arranged vertically to each other in space, and in the height direction of the silo 1, the installation position of the main material distribution spiral 2 is higher than the installation position of the auxiliary material distribution spiral 4, and the bottom of the main material distribution spiral blade 21 of the main material distribution spiral 2 is 10-100mm higher than the top of the auxiliary material distribution spiral blade 41 of the auxiliary material distribution spiral 4. The specific distance can be adjusted according to the on-site design. The main material distribution spiral 2 can distribute the material front and back, and the auxiliary material distribution spiral 4 can distribute the material left and right.

[0069] Reference Figure 4 As shown, multiple auxiliary material distribution spirals 4 are installed in parallel. Multiple material level spirals 3 are arranged in parallel below the axes of two adjacent auxiliary material distribution spirals 4 (refer to Figure 2 As shown in FIG. 1 , the material level screw 3 partially penetrates into the silo 1. In the height direction of the silo 1, the installation position of the material level screw 3 is lower than the installation position of the auxiliary material distribution screw 4.

[0070] In this embodiment, the material level screw 3 is controlled by frequency conversion. Figure 1 As shown, it includes a material level screw motor 301, a screw shaft 303 and a screw machine housing 304. The screw shaft 303 has a screw shaft section 1 3031, a screw shaft section 2 3032 and a screw shaft section 3033 which are fixedly connected in sequence. Among them, the material level screw motor 301 is arranged on the outside of the silo 1, and the output end of the motor is connected to the screw shaft 303 through a coupling 302; the screw shaft section 1 3031 and the screw shaft section 2 3032 are arranged in the screw machine housing 304, and the screw shaft section 1 3031 is provided with a spiral blade along the direction of the spiral axis, and the screw shaft section 2 3032 and the screw shaft section 3033 are through shafts without spiral blades.

[0071] The screw machine housing 304 is made of high temperature resistant and corrosion resistant materials and is cylindrical in shape. It penetrates the silo wall 11 of the silo 1 and is fixedly connected to the silo wall 11 (see Figure 2 As shown in FIG. 1 , one end of the screw machine housing 304 is connected to the connecting sleeve 1 307, the connecting sleeve 2 308 and the material level screw motor 301 in sequence through bolts, and the other end of the screw machine housing 304 is provided with a notch in the upper half near the end (refer to FIG. 1 ). Figure 1 shown).

[0072] The notch is set to allow the material to fall into the chamber formed by the first section of the screw shaft, the housing and the baffle plate. Compared with the cylindrical screw machine housing, such a setting is more convenient for material removal and material level detection. It should be noted that the size of the notch is based on the size of the material falling into the chamber formed by the first section of the screw shaft 3031, the screw machine housing 304 and the baffle plate 305. In actual applications, a larger or smaller notch can be cut as needed to meet the delivery of the material. The above-mentioned notch can be one or more.

[0073] In the screw machine housing 304, an annular material baffle plate 305 is arranged near the inner wall of the silo 1 where the spiral blades are close to the inner wall of the silo 1. The outer edge of the material baffle plate 305 is fixedly connected to the screw machine housing 304 (to prevent the material baffle plate from moving up and down or left and right to affect the barrier performance of the material). The inner edge diameter of the material baffle plate 305 is slightly larger than the diameter of the through shaft of the screw shaft 303. This arrangement facilitates the material baffle plate 305 to be sleeved on the through shaft of the screw shaft 303.

[0074] In order to protect the heat-sensitive assembly at the end of the material level screw 3, an insulating layer 306 is filled in the annular cavity surrounded by the material baffle plate 305, the screw machine housing 304 and the screw shaft 303. The insulating layer 306 can be made of aluminum silicate insulation cotton or other materials with insulation and heat preservation functions that can be purchased on the market.

[0075] In addition, in order to avoid friction between the heat insulating layer 306 and the spiral shaft 303 and ensure the durability of the heat insulating layer 306, at least the portion of the heat insulating layer 306 close to the axial surface of the spiral shaft 303 needs to be hardened, and at the same time, it is necessary to ensure that the heat insulating layer 306 and the spiral shaft 303 are in clearance fit, and the spiral shaft 303 can rotate without hindrance. It should be noted that the above hardening treatment can be a product modified by adding a surface modifier to the ceramic fiber cotton, or a separately modified thermal insulation brick can be selected as the heat insulating layer.

[0076] This embodiment adopts automatic control technology to realize interlocking control of the material level screw 3 and the auxiliary material distribution screw 4, monitors the current change of the material level screw motor 301, and then adjusts the rotation speed of the auxiliary material distribution screw 4 and the direction of rotation of the material level screw motor 301.

[0077] Example 1

[0078] like Figure 2 and Figure 4 As shown, in this embodiment, the feed port 12 is arranged in the middle position of the top of the silo 1, and an appropriate length of the middle part of the main material distribution spiral 2 and the auxiliary material distribution spiral 4 (for example, 1.5 times the outer diameter of the spiral blade of the main material distribution spiral 2 is set as the length of the through shaft, for example, the outer diameter is 50mm, and the length of the through shaft is 75mm) is a through shaft, and no spiral blades are set, and spiral blades are set in the remaining part, wherein: two main material distribution spirals 2 are arranged in parallel to achieve front and back distribution of materials; five auxiliary material distribution spirals 4 are arranged in parallel to achieve left and right distribution of materials.

[0079] Holes are opened on the silo wall 11 at both ends of the auxiliary material distribution spiral 4, and the material level spiral 3 is relatively arranged. The material level spiral 3 is located between two adjacent main material distribution spirals 2, and its installation position is lower than the installation position of the auxiliary material distribution spiral 4 in the height direction of the silo 1. At the same time, the material level spiral 3 is arranged in two layers, high and low. In this embodiment, the spiral axis spacing of the upper and lower layers of the material level spiral is 500mm, the spiral axis spacing between the upper material level spiral and the auxiliary material distribution spiral is 10mm, and the bottom of the spiral blade of the main material distribution spiral is 10mm higher than the top of the spiral blade of the auxiliary material distribution spiral.

[0080] Example 2

[0081] like Figure 3 and Figure 4 As shown, the difference from Example 1 is that the material level spiral 3 is a single-layer arrangement, and the rest is the same as Example 1. The distance between the spiral axis of the material level spiral and the auxiliary material distribution spiral is 10 mm, and the bottom of the spiral blade of the main material distribution spiral is 10 mm higher than the top of the spiral blade of the auxiliary material distribution spiral.

[0082] Example 3

[0083] like Figure 5 and 6 As shown, the difference from Example 1 is that the main material distribution spiral 2 and the auxiliary material distribution spiral 4 are cantilever spirals, and each material distribution spiral is matched with a driving motor separately, which is suitable for silos with larger spans, and the rest is the same as Example 1. The advantage of using cantilever spirals is that after a single material level spiral detects the material, the auxiliary material distribution spiral 4 adjacent to it can be adjusted in speed separately, which is more conducive to the uniform distribution of the material.

[0084] In this embodiment, the distance between the spiral axes of the upper and lower material level spirals is 800 mm, the distance between the spiral axes of the upper material level spiral and the auxiliary material distribution spiral is 40 mm, and the bottom of the spiral blade of the main material distribution spiral is 80 mm higher than the top of the spiral blade of the auxiliary material distribution spiral.

[0085] Example 4

[0086] like Figure 7 and Figure 8 As shown, in this embodiment, the feed port 12 is arranged on the left side of the top of the silo 1, and the main feeding spiral 2 and the auxiliary feeding spiral 4 located in the silo 1 are both provided with spiral blades, wherein: the main feeding spiral 2 is single, and can pull the material from the blanking position to away from the blanking end along the direction of the spiral axis to achieve front and back distribution of the material; the auxiliary feeding spirals 4 are arranged in parallel with 5, which can pull the material from the left side to the right side to achieve left and right distribution of the material.

[0087] A hole is opened on the silo wall 11 on the right side of the silo 1, and a material level spiral 3 is arranged. The material level spiral 3 is located between two adjacent material distribution spirals 2, and in the height direction of the silo 1, its installation position is lower than the installation position of the auxiliary material distribution spiral 4. At the same time, the material level spiral 3 is arranged in two layers, high and low.

[0088] In this embodiment, the distance between the spiral axes of the upper and lower material level spirals is 1000 mm, the distance between the spiral axes of the upper material level spiral and the auxiliary material distribution spiral is 30 mm, and the bottom of the spiral blade of the main material distribution spiral is 100 mm higher than the top of the spiral blade of the auxiliary material distribution spiral.

[0089] The rest is the same as in Example 1.

[0090] The material level control method and the material level detection method are as follows:

[0091] During the production process, when the material does not reach the height of the material level screw 3, the material level screw 3 runs without load. At this time, it can be considered that the current of the motor of the material level screw 3 is stable and constant; when the material reaches the height of the material level screw 3, the material is brought into the screw machine housing 304 by the screw shaft. Due to the effect of the material baffle 305, when the material accumulates to a certain amount, the load becomes larger, and the current of the material level screw motor increases significantly. By monitoring the current change, it can be determined that the material level in the silo has reached the installation height of the material level screw. Through electrical interlocking control, the speed of the auxiliary material feeding screw is reduced, thereby reducing the height of the material in the silo. At the same time, the frequency converter controls the motor of the material level screw 3 to reverse, and after the material in the screw machine housing 304 is discharged, the screw motor rotates forward again to continue monitoring the material level.

[0092] This cycle is repeated to continuously monitor the material level and achieve the purpose of controlling the material level.

[0093] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A material level detection device, It is characterized in that It includes a material level screw, which includes a motor, a screw shaft and a housing, the screw shaft has a screw shaft section one, a screw shaft section two and a screw shaft section three which are fixedly connected in sequence, the screw shaft section one is provided with a spiral blade along the screw axis direction, a material baffle is provided between the screw shaft section one and the screw shaft section two to prevent materials from entering the screw shaft section two from the screw shaft section one, the screw shaft section one and the screw shaft section two are arranged in the housing, and the power output end of the motor is connected to the screw shaft section three of the screw shaft through a coupling; The end of the shell away from the third section of the screw shaft is provided with a notch to allow the material to fall into the chamber formed by the first section of the screw shaft, the shell and the baffle plate; The annular cavity surrounded by the second section of the spiral shaft, the shell and the baffle plate is filled with a heat insulation layer, and a gap is left between the heat insulation layer and the second section of the spiral shaft; the first section of the spiral shaft is welded with a spiral blade along the spiral axis direction; It also includes a connecting sleeve, in which the three sections of the spiral shaft and the coupling are arranged; the connecting sleeve includes a connecting sleeve 1 and a connecting sleeve 2 that are fixedly connected, one end of the connecting sleeve 1 is fixedly connected to the shell, and one end of the connecting sleeve 2 is fixedly connected to the outer shell of the motor.

2. The material level detection device according to claim 1, It is characterized in that The baffle plate is an annular baffle plate, and the outer edge of the baffle plate is fixedly connected to the shell, and the inner edge diameter of the baffle plate is larger than the diameter of the through shaft of the spiral shaft.

3. A material level detection system for a silo, It is characterized in that It comprises the material level detection device according to any one of claims 1 to 2, and also comprises a material distribution device and a frequency converter; the frequency converter is electrically connected to the motor of the material level detection device; The material distributing device comprises a main material distributing spiral and an auxiliary material distributing spiral.

4. A silo, It is characterized in that It includes the material level detection device according to any one of claims 1-2, the material bin also includes a distribution device and a frequency converter, the material level detection device is spatially arranged below the distribution device, the distribution device is arranged in the material bin, the motor of the material level detection device is arranged outside the material bin, and a section of the spiral shaft of the material level detection device extends into the material bin; the frequency converter is electrically connected to the motor of the material level detection device.

5. The silo according to claim 4, It is characterized in that The material level detection device includes at least one material level spiral. When the number of the material level spirals is multiple, the material level spirals are evenly distributed on both sides of the silo or located on the same side of the silo; and the material level spirals are arranged in at least one layer in the silo.

6. The silo according to claim 5, It is characterized in that The material distribution device comprises a main material distribution spiral and an auxiliary material distribution spiral. In the height direction of the silo, the main material distribution spiral and the auxiliary material distribution spiral are spatially cross-distributed, and the installation position of the main material distribution spiral is higher than the installation position of the auxiliary material distribution spiral; the number of the main material distribution spiral is at least one, the number of the auxiliary material distribution spiral is at least two, and a plurality of the auxiliary material distribution spirals are arranged in parallel; the material level spiral is arranged between two adjacent auxiliary material distribution spirals; and in the height of the silo, the spiral axis of the material level spiral is 10-50mm lower than the spiral axis of the auxiliary material distribution spiral; the bottom of the spiral blade of the main material distribution spiral is 10-100mm higher than the top of the spiral blade of the auxiliary material distribution spiral.

7. The silo according to claim 6, It is characterized in that The material level spirals are arranged in the silo in two layers, wherein the spiral axis of the material level spirals in the upper layer is 10-50 mm lower than the spiral axis of the auxiliary material distribution spiral, and the spiral axis of the material level spirals in the lower layer is 500-1000 mm lower than the spiral axis of the material level spirals in the upper layer; The material level screws are arranged on both sides of the material bin or on the same side of the material bin.

8. The silo according to claim 6, It is characterized in that The top of the silo is provided with a feed inlet, and the bottom of the silo is provided with a discharge port. When the feed inlet is provided at the middle position of the top of the silo, the main material distribution spiral is located below the feed inlet, and at least one main material distribution spiral is provided on each side of the material discharge axis of the silo; when the feed inlet deviates from the center position of the top of the silo, the number of the main material distribution spiral is one; The main material distribution spiral and the auxiliary material distribution spiral are through-axis spirals or cantilever spirals.

9. A method for material level detection or material distribution using the silo according to any one of claims 4 to 8, It is characterized in that The method comprises determining the material level height by the current change of the material level screw, and adjusting the rotation speed of the material distribution device and the direction of the material level screw to realize continuous monitoring of the material level.

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