Statically indeterminate modular main beam amplitude adjustable low-frequency vibration tension and relaxation screen

Abstract

The invention discloses a statically indeterminate modular main beam amplitude adjustable low-frequency vibration tension and relaxation screen. The screen comprises a screen body, a spring support base, a vibration reducing spring, a motor, a bracket, and a statically indeterminate excitation main beam consisting of a pipe beam and a fixed plate; a floating screen frame is arranged on the screen body; elastic screen surfaces are arranged on the screen body and the flowing screen frame; the floating screen frame is hung and mounted at the lower part of the screen body through a rubber hinge; the flowing screen frame can enable the polyurethane elastic screen surfaces to swing up and down under the effect of materials to accelerate the operation speed of the materials to prevent the load concentration; the polyurethane elastic screen surfaces are connected by multiple rectangular screen plates; and two ends of each screen plate are respectively mounted on a fixed cross beam of the screen body and a floating cross beam of the floating screen frame. The floating screen frame and the screen body are in hanging connection by the rubber hinge; and an amplitude adjusting spring is mounted between the two. Vibration exciters are arranged in a side plate and the statically indeterminate main beam. The screen is compact in structure, high in reliability, convenient to adjust the motion mode and the working amplitude and suitable for dry deep screening of wet fine-particle coals in coal preparation plants.

Description

technical field [0001] The invention relates to a vibrating relaxation screen, in particular to an ultra-statically indeterminate modular main beam amplitude-adjustable low-frequency vibration relaxation screen suitable for coal screening, and belongs to the technical field of coal preparation machinery. Background technique [0002] Sieving is an important part of coal processing. Vibrating screens have been widely used as coal screening equipment in coal preparation plants. With the application of fully mechanized raw coal mining automation technology, the degree of raw coal fragmentation has increased, coupled with the application of hydraulic coal mining, underground water spraying and dust prevention, etc., resulting in an increase in fine-grained components and moisture content in raw coal, often resulting in fine-grained coal caking Agglomerates, and the paste blocks the sieve surface. For this kind of wet fine-grained coal, the screening efficiency of ordinary vibr...

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Problems solved by technology

[0008] The patent document with the application number 200710019307.6 proposes a super-large vibrating screen with double sets of ultra-statically determinate mesh beams to excite plate-type combined load-bearing beams. Using the ultra-statically indeterminate structure of the mesh beam body as the main beam, it overcomes the defects of the traditional main beam and is suitable for large-scale vibrating screens. However, its main beam structure is fixed and can only achieve a single linear motion

[0009] The patent document with the application number of 2015205282540 discloses a relaxation and screening section type movable beam amplitude adjustment device, which can adapt to the requirements of different working conditions by adjusting the pre-tightening force of the shear rubber spring to change the range of motion of the floating screen frame , limited by the strength of the rubber spring, the amplitude adjustment range is not large

The patent document with the application number 2015203736591 proposes a banana-shaped vibrating relaxation screen with adjustable amplitude in sections. The floating screen frame is divided into multiple sections. According to actual needs, each section can be adjusted independently by removing or replacing the shearing rubber springs of each section. The amplitude of the screen surface is large, but the amplitude can be adjusted by changing the number of rubber blocks, and the stepless adjustment of the amplitude cannot be realized. If the number of dismantling is too large, the bearing capacity of the floating screen frame will often be affected.

[0010] To sum up, the main problems of existing relaxation screens are as follows: 1) The use of shearing rubber springs causes the springs to be easily torn, hairy or insufficient in supporting capacity; the stiffness, structure and supporting capacity of shearing rubber springs limit the low-frequency working ability 2 ) It is difficult for the excitation beam to overcome the insufficient rigidity and the complex manufacturing problems caused by the use of box-type exciters in large-span dimensions; 3) The amplitude of the floating screen frame is inconvenient to adjust, and stepless adjustment cannot be achieved, and it often changes Floating screen frame carrying capacity

4) The service life of the vibrating screen surface is short

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