A system for removing impurities from a granular material

Abstract

The application provides a granular material impurity removing system, which comprises a box, a dust suction device and a blowing device; the box is internally provided with a discharging disc, a material guiding ring and a collecting hopper, and the top of the box is provided with a feeding hopper; the lower side of the discharging disc is provided with a dust collecting cavity, the top end of the discharging disc is provided with a material distributing part, and the discharging disc is provided with a plurality of raised parts and a discharging groove; the large end of the material guiding ring faces upwards, and the small end faces downwards; the upper end of the collecting hopper is open, the diameter of the upper end is larger than that of the lower end, a material blocking part is arranged at the discharging port of the lower end; the outer edge of the collecting hopper is provided with an air passing channel, a reaction cavity is formed between the material guiding ring and the collecting hopper, a return air cavity is formed between the material guiding ring and the inner wall of the box, and a turbulence cavity is formed between the collecting hopper and the inner wall of the box; the upper side of the discharging disc forms a feeding cavity, and the lower side of the collecting hopper forms a discharging cavity; the dust suction device comprises a suction pipe, and the suction port of the suction pipe is located at the highest point of the material distributing part; and the blowing device comprises inner and outer blowing pipes. The application has compact structure, ingenious design and can effectively remove the fine dust particles mixed in the granular material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of melon seed production and processing equipment, in particular to a granular material impurity removal system. BACKGROUND

[0002] Melon seeds generally refer to melon seeds, including sunflower seeds, pumpkin seeds, watermelon seeds, and zucchini seeds, etc. The roasted melon seeds can be used as snacks, and also as raw materials for cakes, and also as raw materials for oil extraction to make edible oil. After the production and processing or roasting of granular melon seeds, impurities in the melon seed particles usually need to be removed by using an impurity removal device. The commonly used blowing type impurity removal device mainly separates and removes dust, grass clippings, skin and shell sheddings and other light impurities in the material by blowing air on the melon seed material. In the prior art, in order to adapt to the blowing type impurity removal device designed for small batch production, the device is usually designed to be simple, although the cost is low, but such device mainly blows the granular material directly to remove impurities or blows the material during conveying, which not only easily blows the qualified melon seed products to the impurity position to cause waste, but also the impurity removal efficiency and quality are not ideal, and part of the dust particles are not easy to separate from the material. The large blowing type impurity removal device is generally composed of multiple mechanisms, which has a complex structure, high cost, large space occupation and high use cost. In order to improve the effect of removing dust and other impurities, the material needs to be continuously treated in multiple processes, and the impurity removal efficiency is difficult to improve. Therefore, it is necessary to improve the existing impurity removal device. SUMMARY

[0003] Therefore, the application aims to overcome the defects in the prior art and provides a granular material impurity removal system.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A granular material impurity removal system, comprising a box body, a dust collection device and a blowing device; the box body is internally arranged with a discharging disc, a material guiding ring and a material collecting hopper from top to bottom, and a feeding hopper is arranged on the top of the box body;

[0006] The discharging disc is generally conical in shape, with the opening end facing downward, and a conical dust collecting cavity is formed on the lower surface of the discharging disc; a conical material distributing part is arranged at the top end of the discharging disc, and a plurality of raised parts protruding from the surface of the material distributing part are arranged on the upper surface of the discharging disc, a discharging groove is formed between adjacent two raised parts, and a discharging channel is formed between the discharging disc and the inner wall of the box body at the position corresponding to each discharging groove;

[0007] The material guiding ring is conical, with a large end upward and a small end downward, the large end is fixed to the inner wall of the box, and the outer edge of the large end is closed to the inner wall of the box; the small end has a diameter smaller than the diameter of the upper opening of the collecting hopper.

[0008] The collecting hopper is conical, with a diameter of the upper opening larger than that of the lower discharge opening, and a material blocking member is installed at the discharge opening; the outer edge of the upper opening of the collecting hopper is connected to the inner wall of the box through an air passage; the lower end surface of the material guiding ring is different from the upper end surface of the collecting hopper in height, and a reaction cavity is formed between the lower end surface of the material guiding ring and the upper end surface of the collecting hopper; a return air cavity is formed between the material guiding ring and the inner wall of the box, and a turbulent flow cavity is formed between the collecting hopper and the inner wall of the box; the upper side of the discharging disc forms a feeding cavity, and the lower side of the collecting hopper forms a discharging cavity.

[0009] The dust suction device includes a suction pipe extending downward along the center of the feeding hopper to the dust collecting cavity of the discharging disc, the suction pipe is fixed to the top end of the material distributing part, and the suction port of the suction pipe is located at the highest point of the material distributing part, the suction pipe is connected to a dust collector or an exhaust fan; the air blowing device includes an inner layer air blowing pipe on the outer wall of the collecting hopper and an outer layer air blowing pipe on the inner wall of the box, the inner layer air blowing pipe is provided with a plurality of inner layer air blowing holes inclined upward and directed to the inner wall of the box, and the outer layer air blowing pipe is provided with a plurality of outer layer air blowing holes inclined upward and directed to the outer wall of the collecting hopper.

[0010] Further, the inner layer air blowing pipe and the outer layer air blowing pipe are connected through a connecting pipe, an air inlet pipeline connected to the outer layer air blowing pipe is arranged on the side wall of the box, and a fan connected to the air inlet pipeline is arranged outside the box.

[0011] Further, the upper end of the feeding hopper protrudes from the top plate of the box, and a plurality of dust suction pipes are arranged on the top plate of the box, each of the dust suction pipes extends into the inner side of the box and is connected to the feeding cavity.

[0012] Further, the inner wall of the feeding hopper is provided with a plurality of outer layer blocking rings, and the outer side of the suction pipe is provided with a plurality of inner layer blocking rings, and the inner layer blocking rings and the outer layer blocking rings are staggered in the height direction.

[0013] Further, the upper end of the collecting hopper is provided with an outwardly turned flange, the air passage includes a plurality of air passage grooves arranged at the outer edge of the flange, and the part of the flange without the air passage grooves is attached to the inner wall of the box.

[0014] Further, the cross section of the air passage groove gradually decreases from bottom to top.

[0015] Further, the material blocking member includes a flap hinged to the lower end of the collecting hopper, the flap is provided with an outwardly extended structure, and a counterweight is arranged on the outwardly extended structure; in normal state, the counterweight provides a force to make the flap close to the discharge opening of the collecting hopper; when the flap is turned over due to the accumulation of more granular materials on the upper side of the flap, the bending moment of the flap to the hinge point is greater than the bending moment of the center of the counterweight to the hinge point, then the flap is turned over, the materials are discharged downward, and the bending moment provided by the counterweight makes the flap close to the discharge opening again after the discharge of the materials.

[0016] Further, the baffle is provided with a block, the discharge port is covered by the baffle, and the counterweight is located at one side of the baffle.

[0017] Further, the baffle is provided with a plurality of blocks, each baffle is provided with an overhanging structure, and a counterweight is arranged on the overhanging structure of each baffle, respectively, under normal circumstances, an acting force is provided by each counterweight, respectively, so that the baffles are spliced or overlapped with each other to form a closure to the discharge port.

[0018] The application has the advantages and positive effects that:

[0019] The application effectively solves the problem of poor dust removal effect of granular materials in the prior art by reasonably arranging the positions of the discharging disc, the material guiding ring and the material collecting hopper in the box body and ingeniously designing the shapes of the discharging disc, the material guiding ring and the material collecting hopper, has a compact structure, does not need to be maintained, has good use effect, has high impurity removal efficiency, can effectively remove small dust particles that are difficult to clean in the granular materials, has very wide general range, when applied, the airflow at the turbulence cavity is upward, the residual flying dust in the discharging cavity will surge to the reaction cavity, and the dust falling along the wall will be directly blown by the gas blown by the inner and outer layer blow holes, the flying dust in the discharging cavity will be blown to the return air cavity and then suspended and lifted to the dust collecting cavity after entering the reaction cavity, and then is sucked away by the air suction pipe, greatly improving the impurity removal and purification effect, through reasonable structural design, the granular materials can be blown by airflow for dust removal for multiple times in the compact space of the box body, the impurity removal work efficiency is improved in quality, and the impurity removal quality is more guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the application;

[0021] Figure 2 is a schematic view of the feeding hopper having a eave higher than the top plate of the box body in the application;

[0022] Figure 3 is a sectional view of the application;

[0023] Figure 4 is Figure 3 a schematic view of the application when the inner and outer layer blocking rings are arranged in the box body;

[0024] Figure 5 is a schematic view of the application when the flange is arranged on the material collecting hopper in the embodiment of the application;

[0025] Figure 6 is Figure 4 a schematic view of the application when the baffle of the material collecting hopper is in an open state;

[0026] Figure 7is a schematic diagram of a closed structure hopper composed of two baffles in the present invention;

[0027] Figure 8 is Figure 7 is a schematic diagram of the present invention when both baffles are open. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present invention, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

[0031] The specific embodiments of the present invention will be described in detail below.

[0032] A particulate material impurity removal system, such as Figures 1 to 8As shown, including the box 1, dust extraction device and blowing device, the box is arranged from top to bottom in turn with the discharge tray 2, the material guide ring 3 and the material collecting hopper 4, and the feed hopper 33 is arranged on the top of the box. Generally, the box adopts a cylindrical structure design. The outer shape of the discharge tray is generally conical structure, and the opening end faces downward, and the conical dust collecting cavity 5 is formed on the lower surface of the discharge tray. The outer eave can be arranged on the opening end of the discharge tray, and the outer eave is attached to the inner wall of the box. The top end of the discharge tray is provided with a conical material distribution part 6, and a plurality of raised parts 7 protruding from the surface of the material distribution part are arranged on the upper surface of the discharge tray. A discharge slot 8 is formed between adjacent two raised parts, and a discharge channel 9 is formed between the discharge tray and the inner wall of the box at the position corresponding to each discharge slot.

[0033] The material collecting hopper is conical, and the upper end opening diameter is greater than the diameter of the discharge port 10 (i.e. the large end of the material collecting hopper faces upward, and the small end faces downward). The material collecting hopper is provided with a blocking member 11 at the discharge port. The outer edge of the upper end opening of the material collecting hopper is connected to the inner wall of the box, and the lower end surface of the material guide ring is connected to the upper end surface of the material collecting hopper. The height difference between the lower end surface of the material guide ring and the upper end surface of the material collecting hopper forms a reaction cavity 12. The material guide ring and the inner wall of the box form an air return cavity 13, and the material collecting hopper and the inner wall of the box form a turbulent flow cavity 14. The upper side of the discharge tray forms a feed cavity 15, and the lower side of the material collecting hopper forms a discharge cavity 16. The lower part of the box is provided with an opening corresponding to the discharge port, which can facilitate the falling of the granular material after impurity removal. In specific implementation, a container for containing material can be installed or arranged at the lower part of the box. Alternatively, when the impurity removal system is applied to a production line, the opening at the lower end of the box can be arranged above the conveying device (such as a conveyor belt). The granular material after impurity removal falls through the discharge port and directly falls onto the conveying device and is transmitted to the next process for processing. It should be noted that the opening at the lower end of the box is in a necked structure, i.e. a structure with gradually narrowing inner diameter, which is more conducive to precise material falling and reduces the cross-sectional area of the opening, and lays a structural foundation for the air blowing pipe to play a turbulent flow role. It should be noted that in order to facilitate the installation of the structural components in the box, the top plate of the box is preferably designed in a detachable structure.

[0034] The dust suction device comprises a suction pipe 17 extending downward along the center of the feeding hopper to the dust collection cavity of the lower discharge disc, the suction pipe is fixed with the top end of the material distribution part, and the suction port of the suction pipe is at the highest point of the material distribution part, the suction pipe is connected with a dust collector or an exhaust fan, and the device capable of sucking air outward connected on the suction pipe is a conventional technical content in the prior art, which will not be described herein. The air blowing device comprises an inner layer air blowing pipe 18 of the outer wall of the material collecting hopper and an outer layer air blowing pipe 19 of the inner wall of the box body, a plurality of inner layer air blowing holes 20 inclined upward and directed to the inner wall of the box body are arranged on the inner layer air blowing pipe, and a plurality of outer layer air blowing holes 21 inclined upward and directed to the outer wall of the material collecting hopper are arranged on the outer layer air blowing pipe. As a conventional function application of the material collecting hopper and the air blowing device of the application, the gases blown out of the inner and outer layer air blowing holes are interlaced with each other, so that the air flow at the turbulence cavity is upwardly disturbed, the residual dust in the lower discharge cavity will surge to the reaction cavity, and the dust falling along the wall (the outer wall of the material collecting hopper and the inner wall of the box body) will be directly blown by the gases blown out of the inner and outer layer air blowing holes, so that part of the dust in the lower discharge cavity will be blown to the air return cavity, then enter the reaction cavity, and then be suspended and lifted to the dust collection cavity, and then be sucked away by the suction pipe, thereby improving the impurity removal and purification effect. Through reasonable structural design, the particulate material can be blown and dusted multiple times in the compact space of the box body, the efficiency of impurity removal is improved, and the impurity removal quality is more guaranteed. The impurity removal system maximizes the effect of impurity removal and dust removal, and reduces the working burden of the equipment in the subsequent processing process.

[0035] It should be noted that, due to the small diameter of the small end of the guide ring, which is smaller than the diameter of the open end of the upper end of the material collecting hopper, the gas blown into the air return cavity blows along the guide ring to the material collecting hopper, and the problem that the air flow directly acts on the material upwardly does not occur, which does not hinder the material from falling, and also avoids blowing the material to cause loss.

[0036] When the system works, the material enters the box body through the feeding hopper, and is dispersed under the action of gravity (in this process, the material slides obliquely downward and towards the inner wall of the box body), after the material separates from the lower discharge disc, the material will touch the guide ring and slide obliquely downward and away from the inner wall of the box body (the material is equivalent to a zigzag line after entering the box body, the dispersion uniformity is high, which is very beneficial to impurity removal and dust removal), and then the material falls to the material collecting hopper under the action of gravity, in this process, the blowing effect of the air blowing device is superimposed, the dust and other impurities are lifted, at the same time, the air blowing device not only prevents the dust from falling along the inner wall of the box body to a certain extent, but also plays a role in blowing air to the center of the box body, so as to avoid the dust overflowing below the guide ring as much as possible, so as to ensure that more dust lifted is sucked away by the dust suction device, and the efficiency of dust removal and impurity removal is high.

[0037] Generally, the inner blowing pipe and the outer blowing pipe are communicated through several connecting pipes 22, and an air inlet pipe 23 connected with the outer blowing pipe is arranged on the side wall of the box. The connecting pipe serves as a support between the inner and outer blowing pipes and a connecting channel. In this design, the collecting hopper can be directly fixed to the inner blowing pipe, and even without the need of a fixing structure to connect the collecting hopper with the box, the structure of the collecting hopper can be kept stable. Generally, a fan connected with the air inlet pipe can be arranged outside the box to supply air flow into the blowing pipe. Of course, other air supply devices can also be used according to the needs of the person skilled in the art. Since the air flow is supplied into the air inlet pipe by connecting the air inlet pipe, it belongs to the conventional technology and will not be described here.

[0038] In an alternative embodiment, the inner wall of the feeding hopper is provided with several outer barrier rings 25 with different heights, and the outer side of the air suction pipe is provided with several inner barrier rings 26 with different heights, and the inner barrier rings and the outer barrier rings are arranged in an interlaced manner in the height direction. Through the interlaced arrangement of the inner barrier rings and the outer barrier rings, the smoke and dust generated by the material entering the feeding chamber through the feeding hopper can be maximally prevented from overflowing from the feeding hopper, and each inner and outer barrier ring can also play a role in dispersing the material, so that the entering material is more dispersed. When the material passes through the conical material distribution part of the distribution disc, the purpose of nearly uniform dispersion is achieved, so that the dust and other impurities are more easily blown by the air flow, thereby separating the impurities from the granular material and achieving the purpose of removing the impurities.

[0039] The upper end of the feeding hopper protrudes from the top plate 32 of the box, and several dust suction pipes 24 are arranged on the top plate of the box. Each dust suction pipe extends into the inside of the box and communicates with the feeding chamber. Each dust suction pipe can be connected to the same air suction pipe and a dust collector is installed on the air suction pipe. Of course, each dust suction pipe can also be individually connected to another set of air suction device through a pipe, so that the air suction pipe and the dust suction pipe can independently perform dust suction. The person skilled in the art can make a conventional selection according to the actual needs, and the details will not be described here. The upper end of the feeding hopper is higher than the top plate of the box, which is convenient for arranging the dust suction pipe and facilitates feeding and avoids the spattering of granular material during feeding. Since the feeding hopper is conical, the large opening end serves as a feeding inlet and is arranged upward, and the small opening end serves as a discharge outlet and is arranged downward. The air suction pipe is arranged along the center of the feeding hopper cavity downward, so that the arranged air suction pipe can play a role in separating the material. Especially in the scheme with multiple inner barrier rings with different heights, the barrier rings can make the material entering the feeding chamber through the feeding hopper (before falling into the distribution disc) more dispersed, which is more conducive to the suspension and removal of dust and other impurities.

[0040] In another alternative embodiment, namely, another implementation for improving the impurity removal capability by coordinating the operation of the hopper and the blowing device, the upper end of the hopper is provided with an outwardly turned edge 27, and the air passage includes a plurality of air passage grooves 28 opened at the outer edge of the turned edge. In this embodiment, the size and distribution of the air passage grooves at the turned edge are uniform or even unnecessary to emphasize. The part of the turned edge without the air passage grooves is attached to the inner wall of the box, so that the area between the hopper and the discharge disc forms an approximately closed chamber, which is very conducive to the formation of a slight negative pressure in the dust collection cavity on the lower side of the discharge disc. In this scheme, the lower side of the discharge disc (dust collection cavity) is not only a "cover" for gathering dust, but also a "horn" structure for establishing negative pressure, changing from passive dust collection to active dust removal, which is better for dust removal. At the same time, due to the design of the air passage, the negative pressure generated between the area between the hopper and the discharge disc will not (excessive suction) suck away the particulate material, and the impurity removal effect is good without wasting raw materials. In this embodiment, the gas blown out by the blowing pipe will be blown upward through the air passage grooves at the turned edge, which can effectively prevent dust and other particles from falling along the inner wall of the box. The upwardly blown gas will blow the dust particles colliding with the inner wall of the box, increasing the probability of these dust particles being sucked by the dust collection device and improving the impurity removal efficiency.

[0041] The air suction pipe of the dust collection device in the present application is connected to the top of the "horn" of the discharge disc, which is a very clever design. During operation, the dust is mainly removed by the air suction pipe of the dust collection device, rather than by the blowing device. The blowing device plays a supplementary role in lifting the dust, while preventing the dust from falling along the inner wall of the box to some extent. In this application, the upper surface of the discharge disc is used to disperse the material, and the lower surface "horn" structure not only has the effect of gathering dust, but also can establish a slight negative pressure when the dust collection device is working, thereby improving the dust removal effect.

[0042] It should be noted that the cross section of the air passage groove gradually decreases from bottom to top, and a downwardly inclined outer eave can also be provided at the opening end of the discharge disc. The outer eave is attached to the inner wall of the box. Such a structure design can maximize the "sealing" of the chamber between the hopper and the discharge disc (it should be noted that "sealing" here is relative to the open state or through state, and is not intended to achieve an absolute sealing effect). At the same time, the air flow is blown from the large cross section side to the small cross section side of the air passage groove, so that the air flow is larger when it is blown out, i.e., the air flow blown into the air return cavity is larger, and the blowing effect on the material in the reaction chamber is more significant. Under the action of the air flow, the material will not accumulate on the upper side of the turned edge (near the air passage groove). In addition, in order to maximize the prevention of the accumulation of some material at the turned edge, the turned edge can be designed as an upwardly inclined structure, i.e., the outer edge (large diameter end) of the turned edge is located on the upper side of the junction between the turned edge and the hopper (small diameter end), which can ensure that the granular material slides smoothly into the hopper.

[0043] In an alternative embodiment, the material blocking member comprises a baffle 29 hinged to the lower end of the collecting hopper, the baffle is provided with an overhanging structure 30, and a counterweight 31 is provided on the overhanging structure. Under normal circumstances, the counterweight provides a force to make the baffle abut against the discharge opening of the collecting hopper. When the particle material on the upper side of the baffle accumulates more, the bending moment of the baffle to the hinge point is greater than the bending moment of the center of the counterweight to the hinge point, then the baffle is overturned, and the material is discharged downward. After the material is discharged, the bending moment provided by the counterweight makes the baffle close the discharge opening again. Generally, the above-mentioned baffle is provided with a plate, the discharge opening is covered by the plate, and the counterweight is located on one side of the plate, as shown in Figure 6 .

[0044] In a further improved scheme, the baffle comprises a plurality of separate parts, each part is provided with an overhanging structure, and a counterweight is provided on the overhanging structure of each part. Under normal circumstances, each counterweight provides a force to make each baffle abut against each other or overlap, forming a closed structure for the discharge opening. When the material on the upper side of the "closed structure" formed by the abutment or overlap of each baffle reaches a certain weight, which exceeds the force generated by the counterweight on the baffle, each baffle or part of the baffle is opened, so that the material falls down completely or partially, so that the material falls into the collecting hopper without directionality (like the material falls to one side when the single baffle is opened), which is more conducive to the suspension of residual dust particles, and the suspended dust is disturbed by the airflow and discharged into the reaction chamber, and then removed, as shown in Figure 7 and Figure 8 , which are schematic views of the collecting hopper with a closed structure formed by two baffles.

[0045] The baffle and the discharge opening of the collecting hopper do not need to be strictly sealed. When the baffle is designed as a plurality of parts, the baffles also do not need to be strictly sealed between each other. As long as the baffle can keep the material in the collecting hopper to the greatest extent in the opened state, even if part of the material falls down in the process, it will not affect the effect of impurity removal. As a further improved design, a sensor can be provided on the material blocking member (such as on the baffle or at the hinge point of the baffle and the collecting hopper), such as a weight sensor to weigh the material, and then calculate the weight of the material, or a counting sensor to record the number of times the baffle is opened and closed. Since the weight on the baffle is constant (when the weight exceeds the limit, the baffle will open and fall), the approximate weight of the material can be calculated by the number of times the baffle is opened. In this improved scheme, the approximate weight of the material can be known by the staff in real time, which is more reasonable for production and scheduling. It should be noted that during the impurity removal stage, it is generally not necessary or not possible to accurately calculate the actual weight of the material, and it is more feasible to guide production by the approximate weight of the material.

[0046] The application effectively solves the problem of poor dust removal effect of granular materials in the prior art by reasonably arranging the positions of the discharging disc, the material guiding ring and the material collecting hopper in the box and ingeniously designing the shapes of the discharging disc, the material guiding ring and the material collecting hopper, realizes better impurity removal effect under the premise of smaller equipment volume, and can effectively remove fine dust particles mixed in the granular materials which are difficult to clean.

[0047] It should be apparent to those skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application.

[0048] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0049] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A particulate material impurity removal system, characterized in that: The box is internally provided with a lower disc, a guide ring and a collecting hopper arranged in sequence from top to bottom, and is provided with a feeding hopper at the top thereof; The lower disc is in the shape of a cone, with the opening end thereof downward, and a conical dust collecting cavity is formed on the lower surface of the lower disc; the top end of the lower disc is provided with a conical distribution part, and a plurality of raised parts protruding from the surface of the distribution part are arranged on the upper surface of the lower disc, with a lower disc groove being formed between every two adjacent raised parts, and a lower disc passage being formed between the lower disc and the inner wall of the box at the positions corresponding to each lower disc groove; The guide ring is in the shape of a cone, with the large end thereof upward and the small end downward, and the large end is fixed to the inner wall of the box and is closed between the large end and the inner wall of the box; the diameter of the small end is smaller than the diameter of the opening of the upper end of the collecting hopper; The collecting hopper is in the shape of a cone, with the diameter of the opening of the upper end thereof larger than the diameter of the discharge port of the lower end, and a blocking part is arranged at the discharge port; the outer edge of the opening of the upper end of the collecting hopper is spaced from the inner wall of the box to form an air passage; the lower end surface of the guide ring is different in height from the upper end surface of the collecting hopper, and a reaction cavity is formed between the lower end surface of the guide ring and the upper end surface of the collecting hopper; a return air cavity is formed between the guide ring and the inner wall of the box, and a turbulent flow cavity is formed between the collecting hopper and the inner wall of the box; the upper side of the lower disc forms a feeding cavity, and the lower side of the collecting hopper forms a lower disc cavity; The dust collecting device comprises a suction pipe extending downward along the center of the feeding hopper to the dust collecting cavity of the lower disc, the suction pipe is fixed to the top end of the distribution part, and the suction port of the suction pipe is located at the highest point of the distribution part; the air blowing device comprises an inner layer air blowing pipe on the outer wall of the collecting hopper and an outer layer air blowing pipe on the inner wall of the box, a plurality of inner layer air blowing holes are arranged on the inner layer air blowing pipe and are inclined upward and directed toward the inner wall of the box, and a plurality of outer layer air blowing holes are arranged on the outer layer air blowing pipe and are inclined upward and directed toward the outer wall of the collecting hopper.

2. The particulate material impurity removal system of claim 1, wherein: The inner layer air blowing pipe and the outer layer air blowing pipe are connected through a connecting pipe, and an air inlet pipeline connected to the outer layer air blowing pipe is arranged on the side wall of the box.

3. The particulate material impurity removal system of claim 1, wherein: The upper end of the feeding hopper protrudes from the top plate of the box, and a plurality of dust collecting pipes are arranged on the top plate of the box, each of the dust collecting pipes extends into the inner side of the box and communicates with the feeding cavity.

4. The particulate material impurity removal system of claim 1, wherein: A plurality of outer layer blocking rings are arranged on the inner wall of the feeding hopper, and a plurality of inner layer blocking rings are arranged on the outer side of the suction pipe, and the inner layer blocking rings and the outer layer blocking rings are staggered in the height direction.

5. The particulate material impurity removal system of claim 1, wherein: The upper end of the collecting hopper is provided with an outwardly turned edge, the air passage comprises a plurality of air passage grooves arranged at the position of the outer edge of the turned edge, and the part of the turned edge without the air passage grooves is attached to the inner wall of the box.

6. The particulate material impurity removal system of claim 5, wherein: The cross section of the air passage groove gradually decreases from bottom to top.

7. The particulate material impurity removal system of claim 1, wherein: The blocking part comprises a flap hinged to the lower end of the collecting hopper, the flap is provided with an outwardly extending structure, a counterweight is arranged on the outwardly extending structure, and the flap is normally pressed against the discharge port of the collecting hopper by the action force provided by the counterweight.

8. The particulate material impurity removal system of claim 7, wherein: The flap comprises one piece, the discharge port is covered by the flap, and the counterweight is located at one side of the flap.

9. The particulate material impurity removal system of claim 7, wherein: The flap comprises a plurality of pieces, each of the flaps is provided with an outwardly extending structure, a counterweight is arranged on the outwardly extending structure of each of the flaps, and the action force is respectively provided by the counterweights to make the flaps jointed or overlapped with each other to form the closure of the discharge port.

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