Variable frequency multi-stage screen
By using a variable frequency multi-stage sieve design, a Z-shaped structure, and a variable frequency vibrator, the problems of insufficient screening and low efficiency of multi-stage sieves when screening wet and sticky fine materials are solved, thus achieving efficient screening of wet and sticky fine materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINXIANG KUNLUN SCREENING MASCH DESIGN CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-05-29
AI Technical Summary
Multi-stage screens have low screening efficiency and low screening coverage when screening wet, sticky fine materials, especially during vibration, where the different properties of materials of different particle sizes lead to excessively long screening paths.
The system adopts a variable frequency multi-stage screening design, including a conveying bin, an upper screening component, and a lower screening component. Utilizing a Z-shaped structure and a variable frequency vibrator, it screens materials through vibration at different frequencies. Combined with an elastic support system, it ensures thorough screening and efficient separation of wet, sticky fine materials.
It improves the screening saturation and efficiency of wet, sticky fine materials, reduces the screening path, and achieves a highly efficient multi-stage screening effect.
Smart Images
Figure CN224293911U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of multi-stage screening technology, and in particular relates to a variable frequency multi-stage screen. Background Technology
[0002] A multi-stage sieve is a device or method used for material screening or grading. It continuously separates materials into multiple grades according to particle size through multiple sieves or screening stages with different apertures. Its main feature is its multi-stage screening design, which can complete material grading in one pass. Compared to single-stage sieves, it has higher efficiency and accuracy. Multi-stage sieves are widely used in various industries, such as ore particle size classification in mining, grain screening in agriculture, powder and granular material grading in the food industry, particle size control of chemical raw materials, and sand and gravel aggregate classification in the construction industry. However, multi-stage sieves still have the following drawbacks in practical use:
[0003] In operation, multi-stage screens directly use different layers of screens to screen materials under vibration. However, in the screening process, when screening wet and sticky fine materials, the wet and sticky fine materials are directly conveyed. During the conveying process, some of the material adheres to the upper layer due to its stickiness and is directly output after screening, affecting the fullness of screening.
[0004] Secondly, during the screening process, the multi-stage screen directly drives the overall vibration through an external vibrator. During the overall vibration, materials of all particle sizes vibrate at the same frequency. After screening, wet, sticky fine materials have different properties due to the different particle sizes. In order to fully screen, a longer screening path is required, resulting in insufficient efficiency in the multi-stage screen. Utility Model Content
[0005] The purpose of this invention is to provide a variable frequency multi-stage screen, which solves the problems of insufficient screening of wet and sticky fine materials, longer screening path, and low screening efficiency of multi-stage screens by setting up a conveying chamber, an upper screening component, a lower screening component, and an output chamber.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0007] This utility model relates to a variable frequency multi-stage screen, comprising a conveying chamber, an upper screening component, a lower screening component, and an output chamber. The lower screening component is located in the lower part of the conveying chamber, and the upper screening component is located in the upper part of the conveying chamber. The upper screening component includes a first screen frame, a guide plate, and a second screen frame. A guide plate is fixed to one end of the first screen frame, and the second screen frame is fixed to the end of the guide plate away from the first screen frame. The first screen frame faces upward within the conveying chamber, and the first screen frame, guide plate, and second screen frame combine to form a Z-shaped structure. The conveying chamber is inclined, and the lowermost part of the inclined conveying chamber, the lower screening component, the upper screening component, and the upper part of the upper screening component are all fixedly connected to the output chamber. During operation, wet, sticky fine materials are conveyed through the conveying chamber. The upper screening component initially screens the wet, sticky fine materials entering the conveying chamber, and the lower screening component further screens them. The screened wet, sticky fine materials are then output through the output chamber.
[0008] Furthermore, elastic strips 1 are fixed to the inner walls of the conveying chambers at the bottom two long sides of the screen frame 1 and screen frame 2, and elastic strips 2 are fixed to the two side walls of the conveying chamber at the bottom of the lower screening assembly. Support legs are fixed at the four corners of the bottom of the conveying chamber. A feed inlet is provided at the top of the conveying chamber, and the four corners of the bottom are fixed by support legs. Screen frame 1 and screen frame 2 are suspended in the conveying chamber by elastic strips 1 on both sides. The lower screening assembly is supported by elastic strips 2. Elastic strips 1 and 2 buffer and maintain the stability of the screen frame during vibration, ensuring efficient shock absorption when screening wet and sticky fine materials.
[0009] Furthermore, the upper screening component also includes a screen one, and screen one is fixed in both screen frame one and screen frame two, forming a two-stage preliminary screening. After the material is screened by screen frame one, it falls into screen frame two at an accelerated speed through the guide plate. The Z-shaped structure is used to increase the turning and improve the dispersion and screening efficiency of wet and sticky fine materials.
[0010] Furthermore, the lower screening component includes a screen frame three and a screen mesh two. The screen mesh two is fixed inside the screen frame three. The mesh count of the screen mesh two is greater than that of the screen mesh one. The screen mesh two, which has a mesh count greater than that of the screen mesh one, is built into the screen frame three and is used to perform secondary fine screening of the material after preliminary screening. The screen mesh two further separates fine particles during vibration, ensuring accurate grading of materials of different particle sizes.
[0011] Furthermore, both the upper and lower screening components include a variable frequency vibrator and a drive motor. Two variable frequency vibrators are fixedly connected to each of the conveying chambers on one side of each of the three screen frames. The output ends of the variable frequency vibrators are fixed to one side of each of the three screen frames. A drive motor is fixed to the end of each variable frequency vibrator away from the conveying chamber. The output end of the drive motor is fixed to the variable frequency vibrator. Each of the three screen frames is connected to an independent variable frequency vibrator and driven by the drive motor. The high-frequency vibration forces the wet, sticky fine material to tumble rapidly on the screen, preventing blockage. At the same time, the elastic support system works in conjunction to maintain vibration stability.
[0012] Furthermore, each of the output chambers has an output frame fixedly connected to its short side away from the conveying chamber at the bottom, and a discharge hopper fixedly connected to the bottom of each output frame. The output frames at the bottom of the three output chambers are staggered. The bottom of the three output chambers is level with the bottom of the conveying chamber, the top of the lower screening component, and the top of the second screen frame, respectively, from bottom to top. The three output chambers correspond to the bottom of the conveying chamber, the top of the lower screening component, and the top of the second screen frame, respectively, to collect materials of different particle sizes. The staggered arrangement of the output frames and the centralized discharge through the discharge hopper achieve graded output and avoid mixing.
[0013] This utility model has the following beneficial effects:
[0014] This invention solves the problem of insufficient screening efficiency for wet, sticky fine materials in multi-stage screening by setting up a conveying bin, an upper screening component, and a lower screening component. During the screening process, the wet, sticky fine materials are conveyed into the conveying bin through the feed inlet at the top of the conveying bin. They then fall into the first screen frame of the upper screening component. When the first screen frame vibrates, the wet, sticky fine materials are initially screened by the screen mesh 1 in the first screen frame and then conveyed to the guide plate. As the wet, sticky fine materials pass through the guide plate, the flow velocity increases, and after falling, they are agitated and enter the second screen frame. They are further screened by the screen mesh 1 in the second screen frame. The wet, sticky fine materials screened in the first screen frame fall onto the screen mesh 2 in the third screen frame for further screening, thus making the screening efficiency of the multi-stage screening of wet, sticky fine materials higher.
[0015] This invention solves the problem of longer paths and lower screening efficiency in multi-stage screening by setting up a conveying bin, an upper screening component, a lower screening component, and an output bin. The drive motor is activated, which drives a variable frequency vibrator. During operation, the vibrator drives the three screen frames to vibrate at different frequencies. This allows the screen frames one and two in the upper screening component and the screen frame three in the lower screening component to vibrate at different frequencies. This results in the screen mesh one in screen frame one and screen mesh two in screen frame three vibrating at different frequencies, ensuring that wet, sticky fine materials are fully screened and fall to the bottom of the conveying bin. This shortens the path required for full screening in multi-stage screening and increases screening efficiency. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a three-dimensional view of the partially cut-out structure of a variable frequency multi-stage sieve.
[0018] Figure 2 This is a three-dimensional view of the conveyor compartment after it has been partially cut open.
[0019] Figure 3 This is a 3D structural diagram of the above filtering component;
[0020] Figure 4 Here is a 3D structural diagram of the following filtering components;
[0021] Figure 5 A three-dimensional structural diagram of the output compartment;
[0022] Figure 6 This is a three-dimensional diagram of a variable frequency multi-stage sieve assembly structure.
[0023] Figure label:
[0024] 1. Conveying bin; 101. Feed inlet; 102. Elastic strip one; 103. Elastic strip two; 104. Support leg; 2. Upper screening assembly; 201. Screen frame one; 202. Guide plate; 203. Screen frame two; 204. Screen mesh one; 205. Variable frequency vibrator; 206. Drive motor; 3. Lower screening assembly; 301. Screen frame three; 302. Screen mesh two; 4. Output bin; 401. Output frame; 402. Discharge hopper. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation
[0026] Please see Figure 1-4This utility model is a variable frequency multi-stage screen, including a conveying chamber 1, an upper screening component 2, a lower screening component 3, and an output chamber 4. The lower screening component 3 is located at the lower part of the conveying chamber 1. The conveying chamber 1 conveys materials that need to be screened. The lower screening component 3 further screens the materials as they pass through. The upper screening component 2 is located at the upper part of the conveying chamber 1. The upper screening component 2 performs preliminary screening of the materials entering the conveying chamber 1. The upper screening component 2 includes a first screen frame 201, a guide plate 202, and a second screen frame 203. The guide plate 202 is fixed to one end of the first screen frame 201, and the second screen frame 203 is fixed to the end of the guide plate 202 away from the first screen frame 201. The first screen frame 201 faces towards the output chamber 4. The conveying chamber 1 is set up with screen frame 1 201, guide plate 202 and screen frame 203 combined to form a Z-shaped structure. When the material to be screened enters the conveying chamber 1, it first enters screen frame 1 201 for screening, and then enters screen frame 203 for screening under the guidance of guide plate 202. When screening wet and sticky fine materials, the material can be accelerated by falling during screening, generating tumbling and increasing the fullness of screening. The conveying chamber 1 is set up at an inclination, and the bottom of the conveying chamber 1 at the downward end, between the lower screening component 3 and the upper screening component 2, and above the upper screening component 2 are all fixedly connected to the output chamber 4. The output chamber 4 outputs the wet and sticky fine materials of different fineness screened in the conveying chamber 1.
[0027] Specifically, elastic strips 102 are fixed on the inner walls of the conveying chamber 1 at the bottom two long sides of screen frame 1 201 and screen frame 203. Elastic strips 203 are fixed on the two side walls of the conveying chamber 1 at the bottom of the lower screening component 3. Support legs 104 are fixed at the four corners at the bottom of the conveying chamber 1. A feed inlet 101 is opened at the short side facing upward at the top of the conveying chamber 1. Screen frame 1 201 and screen frame 203 are supported and set in the conveying chamber 1 by elastic strips 102. The lower screening component 3 is supported and set in the conveying chamber 1 by elastic strips 203. The support is set in the vibrating screen frame 1 201, screen frame 203 and screen frame 301.
[0028] Furthermore, the upper screening component 2 also includes a screen 204. The screen 204 is fixed inside both the screen frame 201 and the screen frame 203. The upper screening component 2 screens wet, sticky fine materials through the screen 204 during vibration.
[0029] Furthermore, the lower screening component 3 includes a screen frame 301 and a screen mesh 302. The screen mesh 302 is fixed inside the screen frame 301. The mesh size of the screen mesh 302 is larger than that of the screen mesh 204. The lower screening component 3 fixes the screen mesh 302 through the screen frame 301. After being screened by the screen mesh 204, the wet and sticky fine material that falls through is further screened by the screen mesh 302.
[0030] The operation process of this embodiment is as follows: During operation, when screening is carried out, wet and sticky fine materials are conveyed into the conveying chamber 1 through the feed inlet 101 at the top of the conveying chamber 1. They then fall into the screen frame 201 included in the upper screening component 2. When the screen frame 201 vibrates, the wet and sticky fine materials are initially screened by the screen mesh 204 in the screen frame 201 and then conveyed to the guide plate 202. When the wet and sticky fine materials pass through the guide plate 202, the flow rate increases, and after falling, they are agitated and enter the screen frame 203. They are further screened by the screen mesh 204 in the screen frame 203. The wet and sticky fine materials screened by the screen mesh 204 fall onto the screen mesh 302 in the screen frame 301. When the screen frame 301 vibrates, it drives the screen mesh 302 to vibrate, further screening the wet and sticky fine materials that have been screened once. The wet and sticky fine materials after this screening fall to the bottom of the conveying chamber 1, and the wet and sticky fine materials are screened multiple times. Specific Implementation
[0031] Please see Figure 1-6 Based on the first specific embodiment, both the upper screening component 2 and the lower screening component 3 include a variable frequency vibrator 205 and a drive motor 206. Two variable frequency vibrators 205 are fixed through the conveying chamber 1 on one side of each of the screen frames 1 201, 203, and 301. The output ends of the variable frequency vibrators 205 are fixed to one side of each of the screen frames 1 201, 203, and 301, respectively. A drive motor 206 is fixed to the end of each variable frequency vibrator 205 away from the conveying chamber 1. The output end of the drive motor 206 is fixed to the variable frequency vibrator 205. When the upper screening component 2 and the lower screening component 3 are working, the variable frequency vibrators 205 are driven by the drive motor 206. When the variable frequency vibrators 205 are working, they drive the corresponding screen frames 1 201, 203, or 301 to vibrate at high frequency.
[0032] Specifically, each output chamber 4 has an output frame 401 fixedly connected to the short side of its bottom away from the conveying chamber 1. The bottom of each output frame 401 is fixedly connected to a discharge hopper 402. The output frames 401 at the bottom of the three output chambers 4 are staggered. The bottom of the three output chambers 4 is flush with the bottom of the conveying chamber 1, the top of the lower screening component 3, and the top of the second screen frame 203, respectively, according to their height from bottom to top. The bottom of the discharge hopper 402 receives the wet and sticky fine material that has been filtered. During operation, the wet and sticky fine material left after screening in the second screen frame 203, the wet and sticky fine material left after screening in the third screen frame 301, and the wet and sticky fine material at the bottom of the conveying chamber 1 are respectively conveyed to the output chambers 4, conveyed to the output frames 401, and collected into the discharge hopper 402 for discharge.
[0033] The operation process of this embodiment is as follows: During the material screening process, the drive motor 206 is started, and the drive motor 206 drives the frequency converter 205 to work. During the operation of the frequency converter 205, the drive and screen frame 301 vibrate at a frequency, so that the screen frame 1 201 and screen frame 203 included in the upper screening component 2 and the screen frame 301 included in the lower screening component 3 can vibrate at different frequencies, so that the screen mesh 1 204 in the screen frame 1 201, the screen mesh 204 in the screen frame 203, and the screen mesh 2 302 in the screen frame 301 vibrate and screen at different frequencies, so that the wet sticky fine material is fully screened and falls to the bottom of the conveying bin 1. After screening, the wet sticky fine material is conveyed to the output bin 4 and output to the output frame 401 through the output bin 401, and then output to the discharge hopper 402 through the output frame 401.
[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A variable frequency multi-stage screen, comprising a conveying chamber (1), an upper screening assembly (2), a lower screening assembly (3), and an output chamber (4), characterized in that: The lower part of the conveying chamber (1) is provided with a lower screening component (3), and the upper part of the conveying chamber (1) is provided with an upper screening component (2). The upper screening component (2) includes a first screen frame (201), a guide plate (202) and a second screen frame (203). One end of the first screen frame (201) is fixed with a guide plate (202), and the end of the guide plate (202) away from the first screen frame (201) is fixed with a second screen frame (203). The first screen frame (201) is set facing upward in the conveying chamber (1), and the first screen frame (201), the guide plate (202) and the second screen frame (203) are combined to form a Z-shaped structure. The conveying chamber (1) is set at an inclination, and the lowermost part of the conveying chamber (1) at the inclination downward, the lower screening component (3) and the upper screening component (2), and the upper part of the upper screening component (2) are all fixedly connected to the output chamber (4).
2. The variable frequency multi-stage sieve according to claim 1, characterized in that: Elastic strip 1 (102) is fixed on the inner wall of the conveying chamber (1) at the bottom of the two long sides of the screen frame 1 (201) and screen frame 2 (203). Elastic strip 2 (103) is fixed on both sides of the conveying chamber (1) at the bottom of the lower screening component (3). Support legs (104) are fixed at the four corners of the bottom of the conveying chamber (1). A feed inlet (101) is opened at the short side facing upward at the top of the conveying chamber (1).
3. The variable frequency multi-stage sieve according to claim 1, characterized in that: The upper screening component (2) also includes a screen one (204), and the screen one (204) is fixed inside both the screen frame one (201) and the screen frame two (203).
4. The variable frequency multi-stage sieve according to claim 3, characterized in that: The lower screening component (3) includes a sieve frame three (301) and a sieve screen two (302). The sieve screen two (302) is fixed inside the sieve frame three (301), and the mesh number of the sieve screen two (302) is greater than that of the sieve screen one (204).
5. A variable frequency multi-stage sieve according to claim 4, characterized in that: The upper screening component (2) and the lower screening component (3) both include a variable frequency vibrator (205) and a drive motor (206). Two variable frequency vibrators (205) are fixed through the conveying chamber (1) on one side of the first screen frame (201), the second screen frame (203) and the third screen frame (301). The output end of the variable frequency vibrator (205) is fixed to one side of the first screen frame (201), the second screen frame (203) and the third screen frame (301) respectively. A drive motor (206) is fixed at the end of each variable frequency vibrator (205) away from the conveying chamber (1). The output end of the drive motor (206) is fixed to the variable frequency vibrator (205).
6. The variable frequency multi-stage sieve according to claim 1, characterized in that: Each of the output chambers (4) has an output frame (401) fixedly connected to the short side of the bottom away from the conveying chamber (1), and the bottom of each output frame (401) is fixedly connected to the discharge hopper (402). The output frames (401) at the bottom of the three output chambers (4) are staggered from each other. The bottom of the three output chambers (4) is flush with the bottom of the conveying chamber (1), the top of the lower screening component (3), and the top of the second screen frame (203) respectively, according to the height from bottom to top.