Airflow screen

Abstract

The airflow sieve comprises an airflow sieve body, a feeding hopper, an annular housing and a dust collection mechanism, the feeding hopper is vertically arranged at the feeding end of the airflow sieve body, the annular housing is fixedly arranged on the outer wall of the feeding hopper in a sleeving mode, and an annular collection cavity which is distributed around the annular housing and provided with an upward opening is formed between the annular housing and the outer wall of the feeding hopper; the upper end face of the annular housing is lower than the upper end face of the feeding hopper, and the dust suction mechanism is arranged on the side portion of the airflow screen body, communicates with the annular collecting cavity and is used for sucking fine dust particles. According to the utility model, through the work of the dust collection mechanism, a vertically downward annular curtain-shaped air flow can be formed on the periphery of the feed hopper, so that fine powder particles drifting towards the periphery can be sucked and collected as far as possible, the fine powder particles can be effectively prevented from drifting on site at will, and the recovery of the fine powder particles is realized; the waste of materials can be avoided, and the pollution to the field environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of airflow screens, in particular to an airflow screen. Background Art

[0002] The airflow screen is a highly efficient particle screening equipment, mainly used for separating fine particle materials. It uses the power of airflow to grade the materials through the screen. When working, the airflow screen generates a strong airflow, causing the material to flow on the surface of the screen. Smaller particles are carried away by the airflow and pass through the screen, while larger particles remain on the surface of the screen.

[0003] When airflow screens some powdered materials, when the materials are put into the airflow screen from the feed hopper, some fine powder particles will float to the surrounding area at the port of the feed hopper. However, the existing airflow screen is difficult to collect the fine powder particles floating at the port of the feed hopper, which not only causes material waste, but also pollutes the on-site environment. Utility Model Content

[0004] The purpose of the utility model is to provide an airflow screen, which can collect fine powder particles floating at the feed hopper port, and effectively solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0006] An airflow screen includes an airflow screen body, a feed hopper, an annular cover and a dust suction mechanism. The feed hopper is vertically arranged at the feed end of the airflow screen body. The annular cover is fixedly mounted on the outer wall of the feed hopper and forms an annular collection chamber distributed around the feed hopper and opening upward between the annular cover and the outer wall of the feed hopper. The upper end surface of the annular cover is lower than the upper end surface of the feed hopper. The dust suction mechanism is arranged on the side of the airflow screen body and is connected to the annular collection chamber for sucking fine dust particles.

[0007] It can be seen that the air in the annular collection chamber is extracted through the operation of the dust suction mechanism, and a negative pressure is instantly formed in the annular collection chamber. The air above the annular cover is vertically sucked into the annular collection chamber to form an air pressure supplement to achieve air pressure balance, and then a vertical downward annular curtain-like airflow is formed on the periphery of the feed hopper, which can absorb and collect the fine powder particles that drift to the periphery as much as possible, thereby effectively preventing the fine powder particles from scattering at will on the site, thereby avoiding material waste and pollution of the on-site environment.

[0008] Furthermore, the dust suction mechanism includes a dust collector and a dust suction pipe. A mounting bracket is provided on the side of the air flow screen body. The dust collector is arranged above the mounting bracket. One end of the dust suction pipe is connected to the outer wall of the annular cover and communicates with the annular collecting chamber, and the other end is connected to the dust suction port of the vacuum cleaner.

[0009] Furthermore, an interception frame is arranged in a matching manner in the annular collecting chamber near its upper end opening, and leakage holes are evenly distributed on the interception frame. The interception frame is used to intercept large particles of material.

[0010] Furthermore, a skirt is fixed to the top outer edge of the interception frame and cooperates with the top of the annular cover shell to block, a retaining ring is fixed on the inner wall of the annular cover shell, the interception frame has a corner portion that cooperates with the retaining ring portion to block, and the bottom of the interception frame has an inclined portion that converges and tilts toward the center.

[0011] Furthermore, a material guide funnel that is larger at the top and smaller at the bottom is fixed on the inner wall of the feed hopper, and a drive motor is installed in the feed hopper through a bracket fixed on its inner wall. The drive motor extends vertically with the output shaft facing upward, and a material throwing plate is fixed on the end of the output shaft of the drive motor. The material throwing plate is located directly below the lower port of the material guide funnel, and the diameter of the material throwing plate is larger than the inner diameter of the lower port of the material guide funnel and smaller than the minimum inner diameter of the feed hopper.

[0012] Furthermore, an auger conveying rod is fixed at the center of the upper surface of the material throwing tray, and the auger conveying rod extends vertically upward into the material guide funnel.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0014] 1. The utility model operates through the dust suction mechanism to extract the air in the annular collection chamber, and negative pressure is instantly formed in the annular collection chamber. The air above the annular cover is vertically sucked into the annular collection chamber to form air pressure replenishment to achieve air pressure balance, and then a vertical downward annular curtain-like airflow is formed on the periphery of the feed hopper, which absorbs and collects the fine powder particles that drift to the periphery as much as possible, thereby effectively preventing the fine powder particles from scattering at will on the site, avoiding material waste and pollution of the on-site environment.

[0015] 2. The utility model arranges an interception frame at the upper opening of the annular collection chamber to intercept large particles of material that are accidentally scattered at the feed hopper port, thereby preventing the large particles of material from being sucked into the dust collection pipe and causing pipe blockage.

[0016] 3. The utility model drives the throwing plate to rotate by driving the motor. The material falling on the throwing plate is thrown away and hits the inner wall of the feed hopper under the action of centrifugal force, thereby breaking up the clumped materials and pre-crushing the clumped materials before airflow screening, which can improve the fluidity of the material in the airflow screen body and improve the airflow screening quality. When the driving motor drives the throwing plate to rotate, it can synchronously drive the auger conveying rod to rotate. The rotating auger conveying rod can spirally convey the material in the guide funnel downward to avoid material blockage in the guide funnel. The rotation of the throwing plate and the auger conveying rod share the same driving source, which reduces the equipment cost investment and has the advantage of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a three-dimensional schematic diagram of the local structure of the feed hopper of the utility model;

[0019] Figure 3 This is a schematic cross-sectional view of the local structure of the feed hopper of the utility model;

[0020] Figure 4 for Figure 3 A schematic diagram of the structure at center A;

[0021] Figure 5 It is a detailed structural diagram of the interception frame in the utility model.

[0022] In the figure: 1. Air flow screen body; 2. Feed hopper; 21. Bracket; 3. Annular cover; 31. Annular collecting chamber; 32. Blocking ring; 4. Dust suction mechanism; 41. Mounting frame; 42. Dust collector; 43. Dust suction pipe; 5. Intercepting frame; 51. Skirt; 52. Corner; 53. Inclined part; 6. Material guide funnel; 7. Drive motor; 8. Material throwing tray; 9. Auger conveyor rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying 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 a limitation on the embodiments of the present invention.

[0025] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0026] See also Figure 1-Figure 5 The utility model provides an airflow screen, including an airflow screen body 1, a feed hopper 2, an annular cover 3 and a dust suction mechanism 4. The working principle of the airflow screen body 1 is the same as that of the airflow screen in the prior art. The specific structure and working principle are not repeated in this application. The feed hopper 2 is vertically arranged at the feed end of the airflow screen body 1, and the annular cover 3 is fixedly mounted on the outer wall of the feed hopper 2, and an annular collection chamber 31 distributed around the feed hopper 2 and opening upward is formed between the annular cover 3 and the outer wall of the feed hopper 2. The dust suction mechanism 4 is arranged on the side of the airflow screen body 1 and is connected to the annular collection chamber 31 for sucking fine dust particles.

[0027] When using this airflow screen to perform airflow screening on powdered materials, when the materials are put into the feed hopper 2 and fine powder particles are scattered, the dust suction mechanism 4 works to extract the air in the annular collection chamber 31, and a negative pressure is instantly formed in the annular collection chamber 31. The air above the annular cover 3 is vertically sucked into the annular collection chamber 31 to form an air pressure supplement to achieve air pressure balance, and then a vertical downward annular curtain-like airflow is formed on the periphery of the feed hopper 2, which absorbs and collects the fine powder particles scattered to the periphery as much as possible, thereby effectively preventing the fine powder particles from scattering at will on site, thereby avoiding material waste and pollution of the on-site environment.

[0028] The upper end surface of the annular cover 3 is lower than the upper end surface of the feed hopper 2 , which can separate the feed hopper 2 and the annular collecting chamber 31 to prevent the material normally fed into the feed hopper 2 from being sucked into the annular collecting chamber 31 .

[0029] Specifically, the dust suction mechanism 4 includes a dust collector 42 and a dust suction pipe 43. The dust collector 42 adopts the existing technology, and the specific structure and working principle are not repeated here. A mounting bracket 41 is provided on the side of the air flow screen body 1, and the dust collector 42 is arranged above the mounting bracket 41. One end of the dust suction pipe 43 is connected to the outer wall of the annular cover 3 and communicates with the annular collecting chamber 31, and the other end is communicated with the dust suction port of the dust collector 42. Through the operation of the dust collector 42, under the communication action of the dust suction pipe 43, the floating fine powder particles can be sucked into the annular collecting chamber 31 and drawn into the storage box therein through the dust suction pipe 43, so as to realize the suction and collection of fine powder particle materials. After the storage box is full, the storage box is pulled out from the dust collector 42, which facilitates the recycling of the fine powder particle materials.

[0030] Specifically, an interception frame 5 is arranged in a matching manner near the upper opening of the annular collection chamber 31, and leakage holes are evenly distributed on the interception frame 5. The interception frame 5 is used to intercept large particles of material. By arranging the interception frame 5 at the upper opening of the annular collection chamber 31, large particles of material accidentally scattered at the port of the feed hopper 2 can be intercepted to prevent the large particles of material from being sucked into the dust collection pipe 43 and causing pipe blockage.

[0031] Specifically, a skirt 51 is fixed to the outer edge of the top of the interception frame 5 for blocking with the top of the annular cover shell 3, a retaining ring 32 is fixed to the inner wall of the annular cover shell 3, and the interception frame 5 has a corner portion 52 for blocking with the retaining ring 32. The bottom of the interception frame 5 has an inclined portion 53 that is inclined toward the center. The interception frame 5 is placed in the annular collection chamber 31, and the interception frame 5 can be supported at the upper port of the annular cover shell 3 by utilizing the blocking cooperation between the skirt 51 and the upper end of the annular cover shell 3 and the blocking cooperation between the corner portion 52 and the retaining ring 32. When the large particle material intercepted in the interception frame 5 is full, the large particle material can be easily dumped by taking the interception frame 5 out of the annular cover shell 3 vertically upward.

[0032] Secondly, the inclined portion 53 at the bottom of the interception frame 5 allows the large particles in the interception frame 5 to roll and gather toward the center, thereby avoiding blockage caused by the flat distribution at the bottom of the interception frame 5 and affecting the normal suction of fine powder particles.

[0033] Specifically, a material guide funnel 6 with a larger upper portion and a smaller lower portion is fixed on the inner wall of the feed hopper 2, and a drive motor 7 is installed in the feed hopper 2 through a bracket 21 fixed on its inner wall. The drive motor 7 extends vertically and the output shaft faces upward. A material throwing plate 8 is fixed to the end of the output shaft of the drive motor 7, and the material throwing plate 8 is located directly below the lower port of the material guide funnel 6. The diameter of the material throwing plate 8 is larger than the inner diameter of the lower port of the material guide funnel 6 and smaller than the minimum inner diameter of the feed hopper 2. The material entering the feed hopper 2 will fall vertically onto the material throwing plate 8 by the guiding action of the material guide funnel 6, and the material throwing plate 8 is driven to rotate by the operation of the drive motor 7. The material falling on the material throwing plate 8 is thrown away and hits the inner wall of the feed hopper 2 under the action of centrifugal force, thereby breaking up the clumped materials and pre-crushing the clumped materials before airflow screening, which can improve the fluidity of the material in the airflow screen body 1 and improve the airflow screening quality.

[0034] Specifically, an auger conveying rod 9 is fixed at the center of the upper surface of the material throwing tray 8, and the auger conveying rod 9 extends vertically upward into the material guide funnel 6. When the driving motor 7 drives the material throwing tray 8 to rotate, the auger conveying rod 9 can be driven to rotate synchronously. The rotating auger conveying rod 9 can spirally convey the material in the material guide funnel 6 downward to avoid material blockage in the material guide funnel 6. The rotation of the material throwing tray 8 and the auger conveying rod 9 share the same driving source, which reduces the equipment cost investment and has the advantage of energy saving.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An airflow screen, characterized in that: It comprises an airflow screen body (1), a feed hopper (2), an annular cover (3) and a dust collection mechanism (4); The feed hopper (2) is vertically arranged at the feed end of the airflow screen body (1); The annular cover (3) is fixedly mounted on the outer wall of the feed hopper (2), and forms an annular collecting chamber (31) distributed around the feed hopper (2) and opening upward between the annular cover and the outer wall of the feed hopper (2); The upper end surface of the annular cover (3) is lower than the upper end surface of the feed hopper (2); The dust suction mechanism (4) is arranged on the side of the airflow screen body (1) and is in communication with the annular collecting chamber (31) for sucking fine dust particles.

2. The airflow screen according to claim 1, characterized in that: The dust collection mechanism (4) includes a dust collector (42) and a dust collection pipe (43); A mounting frame (41) is provided on the side of the airflow screen body (1), and the dust collector (42) is arranged above the mounting frame (41); One end of the dust suction pipe (43) is connected to the outer wall of the annular cover (3) and communicates with the annular collecting chamber (31), and the other end is communicated with the dust suction port of the dust collector (42).

3. The airflow screen according to claim 1, characterized in that: An interception frame (5) is arranged in a matching manner in the annular collecting chamber (31) near its upper end opening, and leakage holes are evenly distributed on the interception frame (5); The interception frame (5) is used to intercept large particles of material.

4. The airflow screen according to claim 3, characterized in that: A skirt (51) is fixed to the outer edge of the top end of the interception frame (5) and is engaged with the top end of the annular cover (3); A retaining ring (32) is fixed on the inner wall of the annular cover (3), and the interception frame (5) has a corner portion (52) that blocks and cooperates with the retaining ring (32); The bottom of the interception frame (5) has an inclined portion (53) that is inclined toward the center.

5. The airflow screen according to claim 1, characterized in that: A material guide funnel (6) with a larger top and smaller bottom is fixed on the inner wall of the feed hopper (2); A drive motor (7) is installed in the feed hopper (2) via a bracket (21) fixed to the inner wall thereof, and the drive motor (7) extends vertically with the output shaft facing upward; A material throwing tray (8) is fixed to the end of the output shaft of the driving motor (7), and the material throwing tray (8) is located directly below the lower end of the material guide funnel (6); The diameter of the material-discharging plate (8) is larger than the inner diameter of the lower port of the material-guiding funnel (6), and smaller than the minimum inner diameter of the material-feeding hopper (2).

6. The airflow screen according to claim 5, characterized in that: An auger conveying rod (9) is fixed at the center of the upper surface of the material throwing tray (8), and the auger conveying rod (9) extends vertically upward into the material guide funnel (6).

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