A new type of polyurethane rod screen plate special for high amplitude screen

Abstract

The utility model discloses a novel polyurethane rod screen plate special for high amplitude screen belongs to the technical field of rod screen. The screen plate is formed by welding angle steel, channel steel, baffle and transverse supporting rib, longitudinal supporting rib and reinforcing rib to form a frame, the integral polyurethane plate with the steel plate framework is arranged in the frame, the polyurethane plate is detachably fixed on the supporting rib through bolt, the rod mounting hole is formed on it along the width direction, the rod fixing plate is arranged at both ends and the corresponding mounting hole is formed, the metal rod is sequentially arranged in the polyurethane plate and the rod fixing plate to form the screen surface. The screen plate fixes the rod on the polyurethane plate with the steel plate framework to replace the traditional steel punching plate structure, the polyurethane material has good elasticity and wear resistance, can effectively buffer the rod vibration, reduces the bidirectional wear of the rod and the screen surface, improves the fatigue life of the screen plate, and simultaneously, the screen plate adopts the reinforced welding frame, reinforcing rib and detachable installation mode, realizes the combination of high strength bearing and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of bar screen technology, specifically a novel polyurethane bar screen plate for high-width screens. Background Technology

[0002] In recent years, high-amplitude screens have been widely used in screening operations in industries such as coal and power due to their advantages such as large amplitude, large processing capacity, high screening efficiency, and good screening effect. During operation, the screen plate, as an important component that directly participates in material classification and bears vibration, has a key impact on the overall processing capacity, screening effect, and operational stability of the high-amplitude screen due to its structural form and material properties.

[0003] The most commonly used screen plate in existing high-amplitude screens is the bar screen plate. The bars are typically made of elastic alloy steel such as 60Si2Mn. This type of bar screen plate generates secondary vibration during normal operation of the screen, resulting in stronger loosening and throwing effects on the material on the screen surface, leading to high screening efficiency and good screening effect. Therefore, it is widely used in engineering practice. However, long-term use has revealed that traditional bars are generally installed with steel load-bearing structures (such as perforated steel plates or steel beams). The contact between the bars and the steel structure is rigid, which easily leads to severe wear and fatigue damage under high-amplitude vibration and large impact conditions.

[0004] Patent document CN201950025U proposes a high-width screen plate structure, which consists of a screen frame, screen bars, and a fixing plate mounted on the screen frame. The fixing plate has through holes through which the screen bars pass and are locked in place by threads and nuts at both ends. This patent solution still uses a structure where a metal screen frame and metal screen bars are combined, without using a polyurethane board as the supporting substrate for the bars, nor does it involve a structure with a steel plate skeleton inside the polyurethane board. Similarly, patent document CN2794651Y discloses a screen plate. This solution uses a polymer elastic material to partially fix the bars, but the elastic material is mainly located inside the box-shaped crossbeam, constituting a localized filling structure, and does not use a large-area polyurethane board as the screen surface supporting plate.

[0005] Specifically, traditional bar screens suffer from drawbacks such as rapid wear and short service life. The bidirectional wear between the bars and the supporting structure not only shortens the overall lifespan of the screen but also necessitates frequent replacement of spare parts, significantly increasing users' investment in spare parts and maintenance costs. Simultaneously, the hard collisions between metal components can lead to problems such as high noise levels, poor buffering capacity, and susceptibility to fatigue cracks, which to some extent limits the further promotion and use of this type of screen under high-intensity working conditions. Therefore, there is an urgent need for a new type of bar screen with a more rational structural design that can effectively reduce wear, extend service life, and reduce spare parts investment while maintaining high screening efficiency and good screening effect. Utility Model Content

[0006] The technical problem this utility model aims to solve is to overcome the existing defects and provide a novel polyurethane bar screen plate for high-width screens. This screen plate fixes the bars to a polyurethane plate with a steel frame, replacing the traditional steel perforated plate structure. The polyurethane material has good elasticity and wear resistance, which can effectively buffer the vibration of the bars, reduce bidirectional wear of the bars and the screen surface, and improve the fatigue life of the screen plate. At the same time, the screen plate adopts a reinforced welded frame, reinforcing ribs, and a detachable installation method, achieving a combination of high strength load-bearing capacity and convenient maintenance, which can significantly improve the service life of the screen plate and reduce maintenance costs, effectively solving the problems in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a novel polyurethane bar screen plate for high-width screens, comprising angle steel, baffle, bar fixing plate, channel steel, polyurethane plate, transverse support ribs, bars, and longitudinal support ribs. The channel steel and angle steel form a rectangle and are welded together. The baffle is welded to the inner side of the angle steel. The angle steel, baffle, channel steel, transverse support ribs, and longitudinal support ribs are integrally welded to form a frame structure for installing the screen surface. The polyurethane plate is disposed within the frame structure and fixed to the transverse support ribs by bolts. The polyurethane plate has a steel plate skeleton inside, and its upper part is provided with bar fixing holes along the width direction of the screen plate. The bar fixing plates are respectively disposed at both ends of the frame structure and are screwed together with the angle steel and baffle. The bar fixing plates at both ends are provided with bar fixing holes along the width direction of the screen plate, corresponding to the bar fixing holes on the polyurethane plate. A plurality of bars are spaced apart along the width direction of the screen plate to form a bar screen surface.

[0008] The polyurethane board is an integrally molded structure, with a steel plate skeleton encasing the polyurethane material and extending along the length and / or width of the sieve plate to improve the load-bearing capacity and fatigue resistance of the polyurethane board.

[0009] Furthermore, the inner side of the channel steel is welded with reinforcing ribs, which are arranged at equal intervals to enhance the overall rigidity and deformation resistance of the frame structure.

[0010] Furthermore, the polyurethane board and the transverse support rib are connected by several evenly distributed bolts, which are arranged along the length or width of the sieve plate to achieve detachable fixing of the polyurethane board and the frame structure.

[0011] Furthermore, each of the bars is sequentially inserted through the bar fixing holes on the polyurethane plate and the bar fixing plate and fixedly connected to form a bar screen surface.

[0012] The spacing of the bars in the width direction of the screen plate is set to be equidistant or unequal according to the particle size range of the material to be screened, so as to adapt to the screening requirements of materials with different particle sizes.

[0013] Furthermore, the bar is a metal bar that extends along the length of the sieve plate; the diameter of the bar fixing hole is matched with the outer diameter of the bar so that the installation of the bar on the polyurethane plate has a certain elastic clamping effect, thereby reducing the relative wear between the bar and the polyurethane plate.

[0014] The external dimensions of the screen plate and the mounting hole positions of the angle steel are matched with the screen box mounting interface of the high-width screen machine, so that the polyurethane bar screen plate can be used as a direct replacement for the original bar screen plate of the high-width screen.

[0015] Furthermore, transverse support ribs are arranged along the width of the sieve plate, and longitudinal support ribs are arranged along the length of the sieve plate to form a grid-like support structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. The utility model uses angle steel, channel steel, baffles, and transverse and longitudinal support ribs to form an integrally welded rectangular frame structure, and arranges reinforcing ribs on the inner side of the channel steel, so that the screen plate has higher overall rigidity and deformation resistance under high amplitude and large impact working conditions, fundamentally improving the problem that traditional bar screen plates are prone to fatigue cracks, frame weld failure or local collapse during long-term vibration; this structure not only improves the load-bearing reliability, but also provides a more stable installation foundation for polyurethane plates and bars.

[0017] 2. This utility model incorporates an integrally molded polyurethane board with a steel plate skeleton inside the frame and is detachably fixed to the transverse support ribs with bolts. This allows the polyurethane board to maintain sufficient load-bearing strength while possessing good elasticity and wear resistance. The polyurethane board can absorb the impact load during the movement of the bars, reduce the rigid metal contact between the bars and the bearing substrate, thereby effectively reducing bidirectional wear and improving the service life of the bars and the screen surface. This solves the problems of rapid wear, short service life, and frequent maintenance of traditional steel perforated plates or steel beam structures.

[0018] 3. A multi-point fixing structure is adopted, in which the bars are inserted through the fixing holes of the polyurethane board and locked by bolts at both ends of the bar fixing plates. This structure provides the bars with dual constraints of elastic clamping and mechanical fixing at the ends. This structure not only improves the fixing reliability of the bars under high-amplitude vibration conditions and reduces the risk of loosening and falling off, but also enables the bars to generate more stable secondary vibration under elastic support, thereby improving the material loosening effect and increasing the screening rate and screening stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the AA cross-sectional structure of this utility model; Figure 3This is a schematic diagram of the BB cross-sectional structure of this utility model.

[0020] In the diagram: 1 Angle steel, 2 Baffle, 3 Bar fixing plate, 4 Channel steel, 5 Reinforcing rib, 6 Polyurethane board, 7 Transverse support rib, 8 Bar, 9 Longitudinal support rib. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Please see Figure 1-3 This utility model provides a technical solution: a novel polyurethane bar screen plate for high-amplitude screens, comprising angle steel 1, baffle 2, bar fixing plate 3, channel steel 4, reinforcing ribs 5, polyurethane plate 6, transverse support ribs 7, bars 8, and longitudinal support ribs 9; the channel steel 4 and angle steel 1 cooperate to form a rectangular structure and are fixedly connected by welding; the baffle 2 is welded to the inner side of the angle steel 1, and the angle steel 1, baffle 2, and channel steel 4 together form the outer frame of the screen plate; multiple transverse support ribs 7 are arranged along the width direction of the screen plate, and multiple longitudinal support ribs 9 are arranged along the length direction of the screen plate, and are integrally welded to the angle steel 1, channel steel 4, and baffle 2 respectively, thereby forming an integrally welded frame structure; the inner side of the channel steel 4 is provided with several equally spaced reinforcing ribs 5 to enhance the deformation resistance of the frame and improve the structural stability of the screen plate under high-amplitude screen vibration conditions.

[0023] A polyurethane board 6 is installed inside the frame structure. The polyurethane board 6 is an integrally molded structure, which is covered with a steel plate skeleton. The steel plate skeleton extends along the length and / or width of the screen plate to improve the load-bearing capacity and fatigue resistance of the polyurethane board 6. The polyurethane board 6 is fixed to the transverse support rib 7 by several bolts. The bolts are evenly arranged along the length or width of the screen plate, so that the polyurethane board 6 can be detachably installed in the frame for easy maintenance or replacement in the future.

[0024] The upper part of the polyurethane board 6 is provided with one or more rows of rod fixing holes along the width direction of the sieve plate; the rod fixing plates 3 are respectively set at both ends of the frame structure and are fixed to the angle steel 1 and the baffle 2 by bolts; the rod fixing plates 3 are provided with through holes along the width direction of the sieve plate that correspond one-to-one with the rod fixing holes on the polyurethane board 6.

[0025] When installing the bars 8, each bar 8 is sequentially passed through the fixing holes on the polyurethane plate 6 and the corresponding holes on the bar fixing plate 3, and is locked in place by fasteners to form a stable bar screen surface; the spacing of the bars 8 in the width direction of the screen plate can be set to equal or unequal spacing according to the particle size requirements of the material to be screened; the bars 8 are preferably metal bars that extend along the length direction of the screen plate; the diameter of the bar fixing holes matches the outer diameter of the bars 8, so that the bars 8 have a certain elastic clamping effect when combined with the polyurethane plate 6, thereby reducing the wear of the bars 8 during vibration.

[0026] In this embodiment, the external dimensions of the screen plate and the mounting hole position of the angle steel 1 are consistent with the screen box interface of the existing high-width screen machine. Therefore, the polyurethane bar screen plate can be used as a direct replacement for the traditional bar screen plate without modifying the structure of the screen machine.

[0027] Working principle During the operation of the high-amplitude screen, the bars 8 generate secondary vibration under strong vibration, which realizes the loosening, throwing and screening of materials; due to the good elasticity of the polyurethane plate 6, it can absorb part of the vibration force of the bars and reduce the metal contact between the bars and the supporting base, thereby effectively reducing wear; the steel plate skeleton inside the polyurethane plate 6 provides sufficient rigidity, so that the polyurethane plate 6 remains stable and does not deform under high vibration conditions.

[0028] The frame consists of angle steel 1, channel steel 4, baffle 2, transverse support ribs 7 and longitudinal support ribs 9, and combined with the reinforcing ribs 5 inside the channel steel 4, so that the screen plate still has good anti-deformation performance under large amplitude impact and long-term stable and reliable operation.

[0029] The bar 8 is connected to the polyurethane plate 6 and the bar fixing plate 3 to form a multi-point fixing structure, which has both flexible constraint of elastic clamping and mechanical locking formed by the fixing plates at both ends, making the bar 8 less likely to loosen or fall off during operation; the elastic support of the polyurethane plate 6 also makes the bar 8 generate more stable secondary vibration, which is beneficial to improving screening efficiency and screening quality.

[0030] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A novel polyurethane bar screen plate for high-width screens, comprising angle steel (1), baffle (2), bar fixing plate (3), channel steel (4), polyurethane plate (6), transverse support ribs (7), bars (8), and longitudinal support ribs (9), characterized in that: The channel steel (4) and the angle steel (1) form a rectangle and are welded together. The baffle (2) is welded to the inner side of the angle steel (1). The angle steel (1) and the baffle (2) are welded together with the channel steel (4), the transverse support rib (7), and the longitudinal support rib (9) to form a frame structure for installing the screen surface. The polyurethane board (6) is set inside the frame structure and is fixed to the transverse support rib (7) by bolts. The polyurethane board (6) has a steel plate skeleton inside and a bar fixing hole is provided on its upper part along the width direction of the screen plate. The bar fixing plates (3) are respectively set at both ends of the frame structure and are screwed together with the angle steel (1) and the baffle (2). The bar fixing plates (3) at both ends are provided with bar fixing holes corresponding to the bar fixing holes on the polyurethane board (6) along the width direction of the screen plate. Several bars (8) are spaced apart along the width direction of the screen plate to form a bar screen surface.

2. The novel polyurethane bar screen plate for high-amplitude screens according to claim 1, characterized in that: The inner side of the channel steel (4) is welded with reinforcing ribs (5), which are arranged at equal intervals.

3. The novel polyurethane bar screen plate for high-amplitude screens according to claim 1, characterized in that: The polyurethane board (6) and the transverse support rib (7) are connected by several evenly distributed bolts, which are arranged along the length or width of the sieve plate.

4. The novel polyurethane bar screen plate for high-amplitude screens according to claim 1, characterized in that: Each of the bars (8) is sequentially inserted into the bar fixing holes on the polyurethane plate (6) and the bar fixing plate (3) and fixedly connected to form a bar screen surface.

5. The novel polyurethane bar screen plate for high-amplitude screens according to claim 4, characterized in that: The bar (8) is a metal bar; the diameter of the bar fixing hole is matched with the outer diameter of the bar (8) so that the installation of the bar (8) on the polyurethane plate (6) has an elastic clamping effect.

6. The novel polyurethane bar screen plate for high-amplitude screens according to claim 1, characterized in that: The transverse support ribs (7) are set along the width of the sieve plate, and the longitudinal support ribs (9) are set along the length of the sieve plate to form a grid-like support structure.

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