Modular rigid-flexible coupling variable elasticity equal thickness screen

Abstract

A module rigid-flexible coupling variable elasticity equal-thickness screen comprises a screen box body, an elastic support and a base support, the screen box body comprises two oppositely arranged screen box side plates and a screen surface, a top portion, a middle portion and a bottom portion between the two screen box side plates are respectively provided with an exciting beam, a reinforcing beam and a bearing beam, the screen surface is installed on the bearing beam and is a rigid-flexible coupling variable elasticity screen surface, the rigid-flexible coupling variable elasticity screen surface comprises a rectangular rigid metal framework and a flexible polyurethane screen surface, the flexible polyurethane screen surface is covered outside the metal framework, and the flexible polyurethane screen surface is further provided with a flexible polyurethane reinforcing rib on a bottom surface thereof; the rigid metal framework, the flexible polyurethane screen surface and the flexible polyurethane reinforcing rib are in an integral forming structure; and the elastic modulus and the hardness of the flexible polyurethane screen surface are distributed in a certain change rule along a length direction of the screen surface. The application can effectively solve the problem of material group accumulation at an inlet end in the process of sticky and wet material group screening, has the advantages of simple structure, high reliability, convenient screen surface replacement, large processing capacity and high screening efficiency.

Description

Technical Field

[0001] This invention relates to a uniform thickness screen, and more particularly to a modular rigid-flexible coupled variable elastic uniform thickness screen, belonging to the field of material screening technology. Background Technology

[0002] Screening is a crucial step in coal and mineral sorting and processing, widely used in grading, pre-desliming, product dewatering, and demediuming operations. Single-angle constant-amplitude vibrating screens exhibit the same amplitude and vibration intensity from the feed end to the discharge end. This leads to material accumulation at the feed end, resulting in a thick material layer on the screen and slow material stratification. At the discharge end, the material layer rapidly thins, resulting in short screening times for difficult-to-screen particles, low throughput, low screen surface utilization, and poor screening efficiency.

[0003] By altering the projection intensity in different areas of the screen surface, a larger acceleration is applied to the material group at the feed end, resulting in higher movement speed and faster material stratification. Conversely, a smaller acceleration is applied at the discharge end, slowing down the movement speed and increasing the pass-through rate of fine particles. This ensures a uniform thickness distribution of the material group along the entire length of the screen surface, achieving equal-thickness screening. The projection intensity can be changed by adjusting the inclination angle of different areas of the screen surface or the amplitude perpendicular to the screen surface. Currently, equal-thickness screening is mainly achieved through multi-segment variable-angle screen structures and multi-axis vibration structures. Multi-segment variable-angle equal-thickness screens offer good screening performance but have complex structures and require a large footprint. Multi-axis vibrating variable-trajectory equal-thickness screens also offer good screening performance, but their complex vibration structures are prone to failure. Summary of the Invention

[0004] The purpose of this invention is to provide a modular rigid-flexible coupling variable elastic equal thickness screen. This screening equipment has a simple structure, convenient screen surface replacement, high screen surface utilization, large processing capacity, and good screening effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a modular rigid-flexible coupling variable elastic equal thickness screen, comprising a screen box body, elastic supports and a base support. The screen box body includes two screen box side plates and a screen surface arranged opposite to each other. A vibration beam, a reinforcing beam and a load-bearing beam are respectively installed at the top, middle and bottom of the two screen box side plates. A vibrator is installed on the vibration beam. The screen surface is installed on the load-bearing beams arranged in parallel, with one end of the screen surface being the feed end and the other end being the discharge end. The screen box body is fixed to the base support by the elastic supports symmetrically arranged on the outside of the two screen box side plates.

[0006] The screen surface is a rigid-flexible coupled variable elastic screen surface, which includes a rigid metal frame and a flexible polyurethane screen surface. The rigid metal frame is rectangular, and the flexible polyurethane screen surface covers the outside of the rigid metal frame. Flexible polyurethane reinforcing ribs are also provided on the bottom surface of the flexible polyurethane screen surface. The rigid metal frame, the flexible polyurethane screen surface and the flexible polyurethane reinforcing ribs are integrally formed.

[0007] The elastic modulus and hardness of the flexible polyurethane screen surface vary along the length of the screen surface in a certain way. That is, from the feed end to the discharge end, the elastic modulus and hardness of the front section of the flexible polyurethane screen surface are smaller than those of the middle section, and the elastic modulus and hardness of the rear section are larger than those of the middle section.

[0008] Furthermore, the elastic support includes a screen box connector, a vibration damping spring, and a support. The screen box connector is fixed to the two screen box side plates, the vibration damping spring is connected between the screen box connector and the support, and the support is fixed to the base bracket.

[0009] Beneficial effects: The rigid-flexible coupling variable elastic screen surface of the present invention is integrally cast from a rigid metal skeleton structure and a flexible polyurethane material, resulting in high screen surface reliability, non-clogging, and easy replacement. By changing the elastic modulus and hardness of the modular rigid-flexible coupling variable elastic screen surface to match the material characteristics during screening, equal thickness screening of material groups can be achieved. The screen has a simple structure, high screen surface utilization, large processing capacity, and good screening effect, making it suitable for efficient screening of wet materials such as coal, minerals, and building material aggregates. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a three-dimensional structure of a modular rigid-flexible coupled variable elastic equal thickness screen according to the present invention.

[0011] Figure 2 This is a top view of the rigid-flexible coupling variable elastic screen surface of the present invention.

[0012] Figure 3 This is a schematic diagram of the internal structure of the rigid-flexible coupled variable elastic screen surface of the present invention.

[0013] Figure 4 This is a diagram showing the arrangement of the rigid-flexible coupling variable elastic screen surface of the present invention.

[0014] In the diagram: 1. Vibrator; 2. Screen box body; 2-1. Vibration beam; 2-2. Reinforcing beam; 2-3. Load-bearing beam; 2-4. Screen box side plate; 3. Screen surface; 3-1. Rigid metal frame; 3-2. Flexible polyurethane screen surface; 3-3. Flexible polyurethane reinforcing rib; 4. Spring support; 4-1. Screen box connector; 4-2. Shock-absorbing spring; 4-3. Support; 5. Base bracket. Detailed Implementation

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] like Figure 1 As shown, a modular rigid-flexible coupled variable elastic equal thickness screen of the present invention includes a screen box body 2, an elastic support 4, and a base bracket 5. The screen box body 2 includes two screen box side plates 2-4 arranged opposite to each other and a screen surface 3. A vibration beam 2-1, a reinforcing beam 2-2, and a load-bearing beam 2-3 are respectively installed at the top, middle, and bottom between the two screen box side plates 2-4. A vibrator 1 is installed on the vibration beam 2-1.

[0017] The screen surface 3 is installed on the parallel load-bearing beams 2-3, with one end of the screen surface 3 being the feed end and the other end being the discharge end; for example Figures 2 to 4 As shown, the screen surface 3 is a rigid-flexible coupled variable elastic screen surface, which includes a rigid metal frame 3-1 and a flexible polyurethane screen surface 3-2. The rigid metal frame 3-1 is rectangular, and the flexible polyurethane screen surface 3-2 covers the outside of the rigid metal frame 3-1. The bottom surface of the flexible polyurethane screen surface 3-2 is also provided with flexible polyurethane reinforcing ribs 3-3. The rigid metal frame 3-1, the flexible polyurethane screen surface 3-2, and the flexible polyurethane reinforcing ribs 3-3 are integrally formed, that is, they are cast as a whole. The internal rigid metal frame 3-1 and the external flexible polyurethane reinforcing ribs 3-3 can improve the overall structural rigidity and strength of the screen surface, and the external flexible polyurethane screen surface 3-2 can effectively solve the problem of clogging by sticky wet material groups during the screening process.

[0018] The elastic modulus and hardness of the flexible polyurethane screen surface 3-2 are distributed in a certain way along the length of the screen surface. That is, from the feed end to the discharge end, the elastic modulus and hardness of the front section of the flexible polyurethane screen surface 3-2 are smaller than those of the middle section, and the elastic modulus and hardness of the rear section are larger than those of the middle section. This is adapted to the characteristics of the material during the screening process to achieve equal thickness screening of the material group.

[0019] The screen box body 2 is fixed to the base bracket 5 by elastic supports 4 symmetrically arranged on the outside of the two screen box side plates 2-4. In this embodiment, the elastic support 4 includes a screen box connector 4-1, a vibration damping spring 4-2, and a support 4-3. The screen box connector 4-1 is fixed on the two screen box side plates 2-4. The vibration damping spring 4-2 is connected between the screen box connector 4-1 and the support 4-3. The vibration damping spring 4-2 is one of a metal spring, a rubber spring, or a composite spring. The support 4-3 is fixed to the base bracket 5.

[0020] Under the harmonic excitation of vibrator 1, due to the different elastic moduli and hardness of the rigid-flexible coupled variable elastic screen surface in different areas of the material flow direction, the elastic modulus and hardness of the front section of the screen surface are smaller than those of the middle section, while the elastic modulus and hardness of the rear section of the screen surface are larger than those of the middle section. The deformation, vibration intensity, and amplitude of the front section of the screen surface at the feed end are all greater than those of the rear section of the screen surface at the discharge end. The material can obtain higher projection intensity and greater movement speed at the feed end, resulting in rapid loosening, stratification, and migration. The vibration intensity of the screen surface at the discharge end is small, the projection intensity of the material is small, and the movement speed is reduced, which prolongs the screening time of the material and increases the screening rate of fine particles. Overall, the material layer on the screen is approximately of equal thickness along the entire length of the screen surface, achieving equal thickness screening of the material group.

[0021] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A modular rigid-flexible coupling variable elastic equal thickness screen, comprising a screen box body (2), elastic supports (4), and a base bracket (5), wherein the screen box body (2) comprises two screen box side plates (2-4) and a screen surface (3) arranged opposite to each other, and an excitation beam (2-1), a reinforcing beam (2-2), and a load-bearing beam (2-3) are respectively installed at the top, middle, and bottom of the two screen box side plates (2-4), an exciter (1) is installed on the excitation beam (2-1), and the screen surface (3) is installed on the load-bearing beam (2-3) arranged in parallel, with one end of the screen surface (3) being the feed end and the other end being the discharge end, and the screen box body (2) is fixed to the base bracket (5) by the elastic supports (4) symmetrically arranged on the outside of the two screen box side plates (2-4); characterized in that, The screen surface (3) is a rigid-flexible coupled variable elastic screen surface, which includes a rigid metal frame (3-1) and a flexible polyurethane screen surface (3-2). The rigid metal frame (3-1) is rectangular, and the flexible polyurethane screen surface (3-2) covers the outside of the rigid metal frame (3-1). Flexible polyurethane reinforcing ribs (3-3) are also provided on the bottom surface of the flexible polyurethane screen surface (3-2). The rigid metal frame (3-1), the flexible polyurethane screen surface (3-2) and the flexible polyurethane reinforcing ribs (3-3) are integrally formed and cast together. The elastic modulus and hardness of the flexible polyurethane screen surface (3-2) are distributed in a certain way along the length of the screen surface. That is, from the feed end to the discharge end, the elastic modulus and hardness of the front section of the entire flexible polyurethane screen surface (3-2) are smaller than those of the middle section, and the elastic modulus and hardness of the rear section are larger than those of the middle section.

2. The modular rigid-flexible coupled variable elastic equal thickness screen according to claim 1, characterized in that, The elastic support (4) includes a screen box connector (4-1), a vibration damping spring (4-2), and a support (4-3). The screen box connector (4-1) is fixed on the two screen box side plates (2-4). The vibration damping spring (4-2) is connected between the screen box connector (4-1) and the support (4-3). The support (4-3) is fixed on the base bracket (5).

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