High-efficiency anti-blocking rod screen mesh

Abstract

The utility model provides a kind of high -efficient screening anti -blocking bar screen, belong to material screening technical field, it includes bracket, bracket is detachably installed with at least two sieve piece units along length direction, sieve piece unit is spaced apart and is provided with at least two long sieve rods along length direction, at least one annular stopper is arranged between any two adjacent long sieve rods, short sieve rod is spaced apart and is provided with at least one annular stopper along its length direction.The utility model has the beneficial effect that it can intercept sheet, needle and other unqualified materials while reducing excessive blocking of qualified materials, improving the flexibility of the screen surface vibration to optimize the anti-blocking performance, reduce material and maintenance costs, and achieve uniform distribution of materials, ensure the screening efficiency and processing capacity stability.

Description

Technical Field

[0001] This utility model belongs to the field of material screening technology, specifically relating to a high-efficiency screening anti-clogging bar screen. Background Technology

[0002] In screening operations in many industries such as blast furnace smelting, mining, and chemical industry, cantilever bar screens are widely used because they have high screening efficiency and can effectively solve the problems of clogging screen holes by sticky materials and the problem of critical particles getting stuck in the holes.

[0003] The structure of existing cantilever bar screens is usually as follows: multiple screen bars (such as spring steel bars, stainless steel bars, alumina ceramic bars, etc.) are set at the spacing required by the user, one end is welded to a square tube, and the other end is in a free cantilever state. After being processed into screen plates, multiple screen plates are arranged in a stepped structure to form the entire cantilever bar screen.

[0004] However, existing cantilever bar screens have significant drawbacks. Because their screen openings are long, narrow slits, materials containing flaky, elongated, or needle-like shapes easily pass through, leading to reduced screening efficiency and material waste. For example, in the lime kiln crushing and screening process in metallurgical and chemical industries, flaky limestone particles easily enter the powdered finished product, causing excessive particle size and reduced quality. In blast furnace ironmaking, large, elongated coke particles that meet specifications are easily screened into the coke crushing system, resulting in costly waste. In the crushing and screening process of sand and gravel aggregates in mining, because the finished sand and gravel aggregates have strict requirements for the content of flaky and needle-like particles, while existing bar screens do not cause screen jamming and have a large processing capacity, the excessive content of flaky and needle-like materials in the finished product directly affects product quality and price. Therefore, the screen surface shape and structural design of existing bar screens are no longer sufficient to meet the requirements for efficient screening and product quality when screening materials containing flaky, needle-like, and elongated shapes.

[0005] To address this issue, some cantilever bar screens on the market have begun to adopt a structure with protrusions on the bars. For example, a bar screen for preventing over-screening is provided in Chinese patent CN201168694Y. However, because all bars are of uniform length and have protrusions, it not only has high processing costs, but also easily causes some non-flaky / needle-shaped qualified materials that meet the size requirements to be stuck or blocked by the protrusions due to this indiscriminate blocking design, which reduces screening efficiency. At the same time, with all bars of uniform length and protrusions, the protrusions of adjacent bars are prone to collision, friction, or jamming during high-frequency vibration, restricting the free movement of the bars and weakening the core advantage of the bar screen in "secondary vibration anti-clogging". Especially when processing viscous materials or materials containing critical particles, the anti-clogging performance is easily affected. Utility Model Content

[0006] The technical problem solved by this utility model is to provide a high-efficiency screening anti-clogging bar screen with low processing cost, which can intercept unqualified materials such as flaky and needle-shaped materials while reducing excessive obstruction of qualified materials, improve the vibration flexibility of the screen surface to optimize anti-clogging performance, reduce material and maintenance costs, and achieve uniform material distribution to ensure screening efficiency and throughput stability.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows: a high-efficiency screening anti-clogging bar screen, comprising a bracket, on which at least two screen plate units are detachably installed along the length direction, and at least two long screen rods are spaced apart along the length direction of each screen plate unit. A short screen rod is positioned between any two adjacent long screen rods, and at least one annular stop is spaced apart along the length direction of each short screen rod. Because this utility model not only arranges the screen rods of varying lengths on the bracket in an alternating pattern, but also only spaces multiple annular stops at the short screen rods, it can, on the one hand, naturally differentiate the vibration frequencies and amplitudes of the long and short screen rods through the design of the spaced screen rods, reducing synchronous vibration interference; on the other hand, by placing annular stops only at the short screen rods, it reduces the risk of collision and jamming between adjacent rods, ensuring high-frequency movement space between adjacent rods, and allowing the screen holes to remain mobile during vibration. This inherits and strengthens the core advantages of bar screens in preventing clogging and jamming, making it more suitable for complex working conditions involving viscous materials or critical particles. On the other hand, the above-mentioned differentiated design can avoid the misscreening of qualified materials caused by indiscriminate blocking, significantly improve the screening qualification rate, and reduce raw material waste. It is especially suitable for scenarios such as mining sand and gravel aggregates where there are strict restrictions on flaky and needle-shaped particles.

[0008] Furthermore, the bracket has a U-shaped cross-section with the opening facing the free end of the screen unit. A wedge-shaped stop is detachably installed on the bottom surface of the bracket opening. The upper surface of the wedge-shaped stop gradually slopes downward from the outside to the inside. All the fixed ends of the long screen rods and all the fixed ends of the short screen rods in the same screen unit are wrapped with an elastic fixing block. The lower surface of the elastic fixing block gradually slopes downward from the outside to the inside. The elastic fixing block is located inside the bracket opening, and the lower surface of the elastic fixing block abuts against the upper surface of the wedge-shaped stop. The upper surface of the elastic fixing block abuts against the top surface of the bracket opening. Thus, the installation of each screen rod at the bracket is achieved by utilizing the cooperation between the wedge-shaped stop and the elastic fixing block. Moreover, compared to the traditional structure where the front root of the sieve rod is directly welded and fixed to the square tube, the front root of the sieve rod in this invention is open and wrapped with elastic material. During vibration, the amplitude change of the secondary vibration generated by the sieve rod starts from the rear tail. This results in a larger amplitude of the entire sieve rod during screening compared to the traditional structure, allowing the sieve holes to move more freely and greatly avoiding the problem of jamming and clogging. Furthermore, the amplitude of the sieve rod's vibration can be adjusted by changing the hardness of the cast elastic material (polyurethane) according to the material, making the sieve hole changes controllable and preventing excessive particles from passing through the sieve. Different sizes of sieve mesh can be created by selecting different numbers of sieve plate units.

[0009] Furthermore, the elastic fixing block is made of rubber or polyurethane, and the polyurethane or rubber can be directly vulcanized and bonded together with each screen bar.

[0010] Furthermore, half the outer diameter of the annular stop is less than the sum of the radius of the short screen bar and the gaps between the adjacent short and long screen bars.

[0011] Furthermore, the long sieve rods are made of spring steel, stainless steel, or alumina ceramic, while the short sieve rods are made of spring steel, stainless steel, or alumina ceramic.

[0012] Furthermore, the annular baffle is made of alumina ceramic and is fixed to the short screen rod with adhesive.

[0013] Furthermore, the annular baffle is made of elastic polyurethane or rubber, and is fixed to the short screen bar by a casting vulcanization process.

[0014] Furthermore, the annular stop is made of alumina ceramic and elastic polyurethane composite.

[0015] Furthermore, the annular stop is made of alumina ceramic and rubber composite.

[0016] Furthermore, the short sieve rod is equipped with 1-3 annular baffles.

[0017] As can be seen from the above technical solutions, this utility model has the following advantages: 1. This utility model adopts a screen bar with long and short intervals. The long screen bar has no annular baffle and can serve as the "main channel" for qualified materials to pass through smoothly. Only the annular baffles of the short screen bars specifically block the flaky and needle-shaped materials that are easy to pass through the slots laterally. This differentiated design avoids the misscreening of qualified materials caused by indiscriminate blocking, significantly improves the screening qualification rate, and reduces raw material waste. It is especially suitable for scenarios such as mining sand and gravel aggregates where there are strict restrictions on flaky and needle-shaped particles. 2. The design of the long and short screen bars adopted in this utility model naturally differentiates the vibration frequency and amplitude of the long and short screen bars, reducing synchronous vibration interference; at the same time, only the short screen bars are equipped with annular blocks, which reduces the risk of collision and jamming between adjacent screen bars, ensures the high-frequency misalignment space of the screen bars, and keeps the screen holes active during vibration. It inherits and strengthens the core advantages of bar screens in preventing clogging and jamming, and is more suitable for complex working conditions of viscous materials or containing critical particles. 3. Setting annular blocks only on short screen bars can reduce material consumption by about 50% (based on a 1:1 interval arrangement), thus reducing manufacturing costs. During maintenance, only the wear of the annular blocks on the short screen bars needs to be focused on. The long screen bars are less prone to damage because they do not have annular blocks, reducing the overall replacement frequency. Moreover, the replacement target is clear, the operation is simple, and the long-term use cost is lower. 4. The stepped screen surface formed by the long and short intervals can guide the material to disperse and flow during vibration, avoid local accumulation, and improve the effective utilization rate of the screen surface; the "main channel" function of the long screen bar ensures the overall material passing efficiency, and combined with the precise interception of the annular baffle at the short screen bar, it can stably maintain a high throughput while ensuring screening quality, meeting the large throughput needs of mining, metallurgy and other industries. 5. By designing the screen rods and brackets separately, the cantilever bar screen can be modularized, breaking down the original cantilever bar screen into multiple modular screen units. These modular units can be combined to create screens of different sizes and specifications. Furthermore, the modular design significantly reduces the screen size without decreasing the screening area, facilitating installation, transportation, replacement, and maintenance. It also enables mass production and assembly line manufacturing, ensuring consistent product quality and parameters. Additionally, in the event of partial damage to the cantilever bar screen in the field, only the affected area can be replaced, reducing user costs. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0019] Figure 1 This is a structural diagram of a specific embodiment of the present invention (the long sieve rod and the short sieve rod are made of spring steel or stainless steel). Figure 2 This is a schematic diagram of the structure of the short sieve rod according to a specific embodiment of the present invention. Figure 1 (The short sieve bars are made of spring steel or stainless steel). Figure 3 This is a schematic diagram of the structure of the short sieve rod according to a specific embodiment of the present invention. Figure 2 (The short sieve rods are made of alumina ceramic). Figure 4 This is a schematic diagram of the arrangement of the sieve unit in this utility model.

[0020] In the diagram: 1. Bracket; 2. Long sieve bar; 3. Short sieve bar; 4. Annular stop block; 5. Elastic fixing block; 6. Wedge-shaped stop block; 7. Sieve plate unit. Detailed Implementation

[0021] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] like Figures 1 to 4As shown, this utility model provides a high-efficiency screening anti-clogging bar screen, which includes a bracket 1. The cross-section of the bracket 1 is U-shaped with the opening facing the free end of the screen unit 7. At least two screen units 7 are detachably installed along the length direction inside the opening of the bracket 1. Specifically, in this embodiment, the screen unit 7 includes a wedge-shaped stop 6 detachably installed on the bottom surface of the opening of the bracket 1 by fasteners such as bolts. The upper surface of the wedge-shaped stop 6 gradually slopes downward from the outside to the inside. The screen unit 7 also includes multiple long screen bars 2 spaced apart along the length direction. The long screen bars 2 are made of wear-resistant spring steel, stainless steel, or alumina ceramic. A short screen bar 3 is provided between any two adjacent long screen bars 2. The short screen bar 3 is also made of wear-resistant spring steel, stainless steel, or alumina ceramic. Meanwhile, the fixed ends of all the long sieve rods 2 and all the fixed ends of all the short sieve rods 3 in the same sieve unit 7 are wrapped with elastic fixing blocks 5. The elastic fixing blocks 5 are made of materials such as rubber and polyurethane and are vulcanized and bonded together with each sieve rod. Moreover, the lower surface of the elastic fixing blocks 5 gradually slopes downward from the outside to the inside. In this way, when the elastic fixing blocks 5 are placed in the opening of the bracket 1, the lower surface of the elastic fixing blocks 5 can abut against the upper surface of the wedge-shaped stop 6, and the upper surface of the elastic fixing blocks 5 can abut against the top surface of the opening of the bracket 1. Thus, the interaction force between the elastic fixing blocks 55 and the wedge-shaped stop 6 is used to stably press and install the elastic fixing blocks 5 into the bracket 1.

[0023] Meanwhile, the short sieve rod 3 is provided with 1-3 annular blocks 4 at intervals along its length, and half of the outer diameter of the annular block 4 is less than the sum of the radius of the short sieve rod 3 and the gaps between adjacent short sieve rods 3 and long sieve rods 2. Furthermore, when the annular block 4 is made of alumina ceramic, it can be fixed to the short sieve rod 3 with adhesive. When the annular block 4 is made of elastic polyurethane or rubber, or when it is a composite of alumina ceramic and elastic polyurethane, or when it is a composite of alumina ceramic and rubber, it can be fixed to the short sieve rod 3 by a casting vulcanization process.

[0024] Based on this, since this utility model not only arranges the screen bars of different lengths on the bracket 1 in an alternating pattern, but also sets multiple annular blocks 4 at intervals only at the short screen bars 3, it can, on the one hand, naturally differentiate the vibration frequencies and amplitudes of the long and short screen bars 3 through the design of screen bars with long and short intervals, reducing synchronous vibration interference; by setting annular blocks 4 only at the short screen bars 3, it reduces the risk of collision and jamming between adjacent bars, ensures high-frequency misalignment space between adjacent bars, and keeps the screen holes active during vibration, inheriting and strengthening the core advantages of bar screens in preventing clogging and jamming, making it more suitable for complex working conditions of viscous materials or containing critical particles. On the other hand, the above-mentioned differentiated design can avoid the misscreening of qualified materials caused by indiscriminate blocking, significantly improving the screening qualification rate and reducing raw material waste, especially suitable for scenarios such as mining sand and gravel aggregates where there are strict restrictions on flaky and needle-shaped particles. Meanwhile, the modular screen unit 7 design allows for selective assembly of the entire high-efficiency screening anti-clogging bar screen, enabling the combination of different numbers of modular screen units 7 to form screens of different specifications and sizes. Furthermore, the modular screen unit 7 design significantly reduces the size of the screens without decreasing the screening area, facilitating installation, transportation, replacement, and maintenance, as well as mass production and assembly line manufacturing, thereby ensuring product quality and parameter consistency. In addition, when partial damage occurs to the cantilever bar screen on-site, partial screen replacement is possible, reducing user operating costs.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency screening anti-clogging bar screen, comprising a bracket (1), characterized in that, The bracket (1) is detachably installed with at least two screen units (7) along the length direction. The screen unit (7) is provided with at least two long screen rods (2) at intervals along the length direction. A short screen rod (3) is provided between any two adjacent long screen rods (2). At least one annular stop (4) is provided at intervals along the length direction of the short screen rod (3).

2. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The cross section of the bracket (1) is U-shaped with the opening facing the free end of the screen unit (7). A wedge-shaped block (6) is detachably installed on the bottom surface of the opening of the bracket (1). The upper surface of the wedge-shaped block (6) gradually slopes downward from the outside to the inside. All the fixed ends of the long screen rods (2) and all the fixed ends of the short screen rods (3) of the same screen unit (7) are wrapped with an elastic fixing block (5). The lower surface of the elastic fixing block (5) gradually slopes downward from the outside to the inside. The elastic fixing block (5) is located inside the opening of the bracket (1), and the lower surface of the elastic fixing block (5) abuts against the upper surface of the wedge-shaped block (6). The upper surface of the elastic fixing block (5) abuts against the top surface of the opening of the bracket (1).

3. The high-efficiency screening anti-clogging bar screen according to claim 2, characterized in that, The elastic fixing block (5) is made of rubber or polyurethane.

4. According to claim 1, the outer diameter of the annular block (4) is less than half the radius of the short screen bar (3) and the sum of the gaps between the adjacent short screen bar (3) and the long screen bar (2).

5. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The long sieve bar (2) is made of spring steel, stainless steel or alumina ceramic, and the short sieve bar (3) is made of spring steel, stainless steel or alumina ceramic.

6. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The material of the annular baffle (4) is alumina ceramic, and the annular baffle (4) is fixed to the short screen rod (3) by adhesive.

7. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The annular baffle (4) is made of elastic polyurethane or rubber and is fixed to the short screen rod (3) by casting vulcanization process.

8. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The annular stop (4) is made of alumina ceramic and elastic polyurethane composite.

9. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The annular stop (4) is made of alumina ceramic and rubber composite.

10. The high-efficiency screening anti-clogging bar screen according to claim 1, characterized in that, The short sieve rod (3) is provided with 1-3 annular baffles (4).

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