Rotatable screen mesh for airflow screen

Abstract

The utility model discloses a rotatable screen mesh for an airflow screen, and relates to the technical field related to screening. The vibrating screen comprises a material conveying shaft, a screen assembly and an air injection assembly, the material conveying shaft is arranged in an inner cavity of the screen assembly, spiral blades are fixed to the periphery of the material conveying shaft, the screen assembly is arranged in a screen shell, and the air injection assembly is further arranged on the inner wall of the portion, outside the screen assembly, of the screen shell. The screen assembly comprises two annular frames, arc-shaped battens distributed in an annular array mode are fixed between the two annular frames, and an arc-shaped screen body is fixed between every two adjacent arc-shaped battens. The outer edge of the part, extending into the screen assembly, of the spiral blade is fixedly connected with the inner arc face of the arc-shaped batten. By arranging the air injection assembly, the screen mesh assembly and the material conveying shaft, the problems that air is blown to the screen mesh from an inner cavity of the screen mesh, the screen mesh is prone to being blocked, the cylindrical screen mesh cannot rotate, and materials are likely to settle and accumulate are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to screening, and particularly relates to a rotatable screen for airflow screening. Background Art

[0002] Airflow screen is a high-precision screening equipment for fine powder screening. It is widely used in chemical, pharmaceutical, food, papermaking, metallurgy, building materials, rubber, machinery and other industries. Theoretically, airflow screen abandons the traditional principle of gravity potential energy operation and opens up a new way of screening with the kinetic energy of the carrier fluid. It uses high-speed airflow as a carrier in a closed state to make the fully diffused powder particles spray to the screen with sufficient kinetic energy to achieve the purpose of rapid classification. However, as far as the screen used for screening is concerned, there are still the following disadvantages in actual use:

[0003] First, in the case of horizontal airflow screens, cylindrical screens are mostly used inside, and a spiral shaft is used to transport materials, in combination with airflow blowing; for example, in the utility model with the authorization announcement number CN 210434812 U, the airflow is blown from the inside of the screen to the inner wall of the screen, thereby assisting the screening of materials. However, this method, because it blows from the inside to the screen, will also cause the screen to be blocked, because the material particles that cannot be screened cannot pass through the screen, so blowing from the inside will also cause the screen holes to be blocked, and it is necessary to improve the blowing method of the airflow;

[0004] Secondly, the cylindrical screen inside the conventional horizontal airflow screen is usually stationary, and the screening process completely relies on the airflow to blow the material. Firstly, the material passes through too fast and cannot be effectively screened. Secondly, a large amount of material may settle at the bottom of the cylindrical screen after entering, and may not be blown away by the airflow for screening, resulting in waste and insufficient screening effect. Utility Model Content

[0005] The utility model aims to provide a rotatable screen for airflow screening, which solves the problems of clogging of the screen due to blowing air into the screen in the inner cavity of the screen, and the inability of the cylindrical screen to rotate, causing the material to settle and accumulate, by arranging an air jet component, a screen component and a feed shaft.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0007] The utility model is a rotatable screen for airflow screen, comprising a feed shaft, a screen assembly, and an air jet assembly. The feed shaft is arranged in the inner cavity of the screen assembly, and spiral leaves are fixed on the outer periphery of the feed shaft. The screen assembly is placed inside the screen shell, and an air jet assembly is also arranged on the inner wall of the screen shell outside the screen assembly.

[0008] The screen assembly includes two ring frames, between which arc-shaped strips distributed in a ring array are fixed, and between every two adjacent arc-shaped strips is a curved screen body fixed; the outer edge of the part of the spiral leaf extending into the screen assembly is fixedly connected to the inner curved surface of the arc-shaped strip.

[0009] Furthermore, the length of the feed shaft is greater than the length of the screen assembly, and parts of the feed shaft and the spiral blades extend into the inner cavity of the screen assembly.

[0010] Furthermore, two symmetrically distributed bearing seats are arranged in the inner cavity of the sieve shell, the inner ring of the bearing seat is fixed to the inner wall of the ring frame, a connecting plate is fixed on the outer wall of the outer ring of the bearing seat, and the end of the connecting plate away from the bearing seat is fixed to the inner wall of the sieve shell.

[0011] Furthermore, the jet assembly includes two arc tubes, and three equidistantly distributed air pipes are fixed between the two arc tubes. Each of the air pipes is fixed with equidistantly distributed air nozzles, and the air outlet ends of all the air nozzles are facing the screen assembly.

[0012] Furthermore, two connecting pieces are fixed to the outer ring of each arc tube, and one end of each connecting piece away from the arc tube is fixed to the inner wall of the sieve shell.

[0013] Furthermore, the jet assembly surrounds a quarter of the area of ​​the screen assembly, and the jet assembly is located at an upper outer side of the screen assembly.

[0014] The utility model has the following beneficial effects:

[0015] The utility model solves the problem that the screen is easily clogged by blowing air into the screen in the inner cavity of the screen by arranging an air jet component and a screen component. The conventional air blowing method is changed to screen the material in the screen component. The air flow is no longer blown from the inside of the screen component. Instead, the air jet component is arranged on the outside of the screen component, and the air nozzle on the air pipe blows air toward the screen component. Even if the screen is clogged with material particles, the particles stuck in the screen holes will be blown down by blowing air from the outside of the screen component, and no blockage will be caused.

[0016] The utility model solves the problem that the cylindrical screen cannot rotate and the material may settle and accumulate by arranging a feeding shaft and a screen assembly. The screen assembly is connected to a spiral blade outside the feeding shaft, and the material is no longer conveyed by a partial spiral blade, but is directly conveyed into the screen assembly and simultaneously driven to rotate the screen assembly, so that the material can be continuously conveyed forward by the spiral blade and continuously contact the screen, and the screen rolls accordingly. Then, the material at the bottom of the screen assembly will continuously roll for screening, and the screening is more efficient and thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 A three-dimensional diagram of a rotatable screen for an airflow screen;

[0019] Figure 2 It is the connection diagram between the jet assembly and the sieve shell;

[0020] Figure 3 It is the structural diagram of the feeding shaft;

[0021] Figure 4 The structural diagram of the screen assembly.

[0022] Reference numerals:

[0023] 1. Feeding shaft; 101. Spiral blade; 2. Screen assembly; 201. Ring frame; 202. Arc strip; 203. Screen body; 3. Jet assembly; 301. Arc tube; 302. Air pipe; 303. Air nozzle; 304. Connecting piece; 4. Screen shell; 401. Bearing seat; 402. Connecting plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] See also Figure 1-4 As shown, the utility model is a rotatable screen for airflow screen, comprising a feed shaft 1, a screen assembly 2, and an air jet assembly 3. The feed shaft 1 is arranged in the inner cavity of the screen assembly 2, and spiral leaves 101 are fixed to the outer periphery of the feed shaft 1. The screen assembly 2 is placed inside a screen shell 4, and an air jet assembly 3 is also arranged on the inner wall of the screen shell 4 outside the screen assembly 2.

[0026] A spiral blade 101 is arranged outside the feed shaft 1 for conveying materials to be screened. A feed inlet is arranged above the spiral blade 101 extending outside the screen assembly 2 for feeding materials. After the materials enter the screen assembly 2, the feed shaft 1 and the spiral blade 101 drive the screen assembly 2 to rotate, and the materials are subjected to rolling screening. The design of the spiral blade 101 enables the materials to be effectively and continuously moved forward for screening. The jet assembly 3 performs jet treatment outside the screen assembly 2 to reduce blockage.

[0027] The screen assembly 2 includes two ring frames 201, between which arc-shaped strips 202 distributed in a circular array are fixed, and between every two adjacent arc-shaped strips 202, an arc-shaped screen body 203 is fixed; the outer edge of the part of the spiral leaf 101 extending into the screen assembly 2 is fixedly connected to the inner arc surface of the arc-shaped strip 202;

[0028] Four arc-shaped strips 202 are fixed between the two ring frames 201 to form a main frame, and an arc-shaped screen body 203 is fixed between adjacent arc-shaped strips 202 to form a cylindrical screen structure for screening operations. The spiral leaves 101 are connected to the arc-shaped strips 202 so that they are fixedly connected to each other. When the spiral leaves 101 rotate, they will drive the screen body 203 to rotate synchronously.

[0029] The length of the feed shaft 1 is greater than the length of the screen assembly 2, and the feed shaft 1 and the spiral blade 101 partially extend into the inner cavity of the screen assembly 2;

[0030] Two symmetrically distributed bearing seats 401 are arranged in the inner cavity of the sieve shell 4. The inner ring of the bearing seat 401 is fixed to the inner wall of the ring frame 201. A connecting plate 402 is fixed to the outer wall of the outer ring of the bearing seat 401. The end of the connecting plate 402 away from the bearing seat 401 is fixed to the inner wall of the sieve shell 4.

[0031] The bearing seat 401 is installed in the inner cavity of the sieve shell 4 through the connecting plate 402 . The outer ring of the bearing seat 401 is fixed, and the inner ring of the bearing seat 401 is fixed to the outer wall of the ring frame 201 , so the ring frame 201 can rotate in the bearing seat 401 .

[0032] The jet assembly 3 includes two arc tubes 301, and three equally spaced air pipes 302 are fixed between the two arc tubes 301. Each air pipe 302 is fixed with an equally spaced air nozzle 303, and the air outlet ends of all the air nozzles 303 are facing the screen assembly 2.

[0033] Two connecting pieces 304 are fixed to the outer ring of each arc tube 301, and one end of each connecting piece 304 away from the arc tube 301 is fixed to the inner wall of the sieve shell 4;

[0034] Two arc tubes 301 are fixed to the inner wall of the screen shell 4 through a connector 304, and a plurality of air pipes 302 are connected through the two arc tubes 301. A large number of air nozzles 303 are distributed on the air pipes 302 to blow air toward the screen assembly 2, thereby blowing down the material blocked in the screen body 203 to ensure that it will not be blocked; any one of the arc tubes 301 is connected to an external air intake assembly (omitted in the figure, such as an air compressor, etc.).

[0035] The air jet assembly 3 surrounds a quarter of the area of ​​the screen assembly 2 , and the air jet assembly 3 is located at the upper outer side of the screen assembly 2 .

[0036] The specific working principle of the utility model is as follows: first, the screen assembly 2 and the jet assembly 3 are both located in the screen shell 4. When the screen assembly 2 is installed, the bearing seat 401 is installed in the inner cavity of the screen shell 4 through the connecting plate 402. The outer ring of the bearing seat 401 is fixed, and the inner ring of the bearing seat 401 is fixed to the outer wall of the ring frame 201. Therefore, the ring frame 201 can rotate in the bearing seat 401. A feed port is set above the spiral leaf 101 extending out of the screen assembly 2 for feeding materials. After the materials enter the interior of the screen assembly 2, the screen assembly 2 is synchronously driven to rotate, so that The material is continuously transported forward along with the spiral blade 101, continuously contacts the screen, and the screen rolls accordingly, so that the material at the bottom of the screen assembly 2 will continuously roll for screening processing. At the same time, in the jet assembly 3, any arc tube 301 is connected to the external air intake system, and the arc tube 301 is fixed to the inner wall of the screen shell 4 through the connector 304, and a plurality of air pipes 302 are connected between the two arc tubes 301. A large number of air nozzles 303 are distributed on the air pipe 302 to blow air toward the screen assembly 2, thereby blowing down the material blocked in the screen body 203.

[0037] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the aforementioned embodiments and any equivalent replacement of some of the technical features therein, any modification, equivalent replacement, and improvement made are all within the protection scope of the present invention.

Claims

1. A rotatable screen for airflow screening, comprising a feed shaft (1), a screen assembly (2), and an air jet assembly (3), characterized in that: A material conveying shaft (1) is arranged in the inner cavity of the screen assembly (2), a spiral blade (101) is fixed to the outer periphery of the material conveying shaft (1), the screen assembly (2) is placed inside the screen shell (4), and an air injection assembly (3) is also arranged on the inner wall of the screen shell (4) outside the screen assembly (2); The screen assembly (2) comprises two ring frames (201), arcuate strips (202) distributed in a ring array are fixed between the two ring frames (201), and an arcuate screen body (203) is fixed between every two adjacent arcuate strips (202); the outer edge of the portion of the spiral blade (101) extending into the screen assembly (2) is fixedly connected to the inner arc surface of the arcuate strip (202).

2. A rotatable screen for airflow screening according to claim 1, characterized in that: The length of the feed shaft (1) is greater than the length of the screen assembly (2), and parts of the feed shaft (1) and the spiral blades (101) extend into the inner cavity of the screen assembly (2).

3. The rotatable screen for airflow screen according to claim 1, characterized in that: Two symmetrically distributed bearing seats (401) are arranged in the inner cavity of the sieve shell (4); the inner ring of the bearing seat (401) is fixed to the inner wall of the ring frame (201); a connecting plate (402) is fixed to the outer wall of the outer ring of the bearing seat (401); and one end of the connecting plate (402) away from the bearing seat (401) is fixed to the inner wall of the sieve shell (4).

4. The rotatable screen for airflow screen according to claim 1, characterized in that: The jet assembly (3) comprises two arc tubes (301), three equally spaced air pipes (302) are fixedly connected between the two arc tubes (301), each of the air pipes (302) is fixedly provided with equally spaced air nozzles (303), and the air outlet ends of all the air nozzles (303) are directed towards the screen assembly (2).

5. A rotatable screen for airflow screening according to claim 4, characterized in that: Two connecting pieces (304) are fixed to the outer ring of each arc tube (301), and one end of each connecting piece (304) away from the arc tube (301) is fixed to the inner wall of the sieve shell (4).

6. A rotatable screen for airflow screening according to claim 1, characterized in that: The jet assembly (3) surrounds a quarter of the area of ​​the screen assembly (2), and the jet assembly (3) is located at an upper outer portion of the screen assembly (2).

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