CN112191508A

CN112191508A - Vibrating screen with vibration exciter

Info

Publication number: CN112191508A
Application number: CN202011064145.XA
Authority: CN
Inventors: 叶诗豪; 杨运猛
Original assignee: Rishangsheng New Building Material Design And Research Institute Co ltd
Current assignee: Rishangsheng New Building Material Design And Research Institute Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-01-08

Abstract

The invention discloses a vibrating screen with a vibration exciter, which relates to the field of vibrating screens and comprises screen meshes, the vibration exciter, a screen frame and supports, wherein at least one layer of screen surface is arranged in the screen frame, each layer of screen surface is formed by sequentially connecting a plurality of levels of screen meshes at intervals at a certain angle from bottom to top in a segmented manner, so that the screen surfaces gradually tilt upwards and are in a curve shape, and the supports are arranged on the left side and the right side of the screen frame and used for supporting the screen frame; each screen is provided with a vibration exciter for adjusting the vibration frequency and the stepless amplitude modulation of the vibration amplitude of the screen. The invention adopts the electromagnetic vibrator to realize non-contact vibration and no noise pollution; the vibration frequency and the vibration amplitude are stepless and adjustable, and the material applicability and the screening effect are improved; the structural form that the screen surface vibrates and the screen frame does not vibrate is adopted, compared with the traditional vibrating screen, the vibrating weight of the whole machine is greatly reduced, and the energy is saved; the vibration frequency and amplitude of each screen surface can be independently adjusted, so that the applicability of different materials and the screening effect of the whole machine are greatly improved.

Description

Vibrating screen with vibration exciter

Technical Field

The invention relates to the field of vibrating screens, in particular to a vibrating screen with a vibration exciter.

Background

As is well known, vibrating screens are commonly used in mine development, such as circular vibrating screens, elliptical screens, etc., and are also technically mature, but the following defects are commonly found:

1. the traditional vibrating screen has a flat screen surface, so that a lot of materials are always accumulated at the feeding end, and the sieving of the materials is not facilitated. Later, banana screens based on the principle of constant thickness screening were developed, the screen surface of which had several inclined angles, and since the initial angle was steep, the rolling acceleration of the material was large, and the speed of dispersion was fast, the material kept the same thickness during the screening process, and the throughput could be made larger. This is an advantage of the banana screen.

2. The traditional vibration exciter has the defects that at present, in vibration feeding (screening) equipment used in the industries of coal, metallurgical mines and the like in China, one is a vibration motor (an electric vibration exciter or a vibration source three-phase asynchronous motor), and the other is a vibrator with an eccentric block driven by a common motor. The vibration force of the vibration exciters in the two forms can not be adjusted on line in the running process of equipment, and the superposition angle of eccentric blocks of a vibration motor or the number of auxiliary eccentric blocks must be adjusted to change the vibration force in a stop state. In addition, the two modes only have adjustable amplitude of a plurality of fixed gears, stepless adjustment cannot be carried out, the labor intensity of workers is high, manual adjustment is required, and the two modes are not convenient enough.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the vibrating screen with the vibration exciter, which has the advantages of high screening efficiency, no noise pollution and low energy loss during vibration.

The purpose of the invention is achieved by the following technical scheme: the vibrating screen with the vibration exciter comprises a screen mesh, the vibration exciter, a screen frame and supports, wherein at least one layer of screen surface is arranged in the screen frame, each layer of screen surface is formed by sequentially connecting a plurality of levels of screen meshes at intervals at a certain angle in a segmented manner from bottom to top, so that the screen surface gradually tilts upwards and is in a curve shape, and the supports are arranged on the left side and the right side of the screen frame and used for supporting the screen frame; each screen is provided with a vibration exciter for adjusting the vibration frequency and the stepless amplitude modulation of the vibration amplitude of the screen.

As a further technical scheme, the vibration exciter comprises permanent magnets fixedly arranged on two sides of the screen mesh and winding conductors fixed at corresponding positions on the screen frame, a groove is formed in each winding conductor, and each permanent magnet is correspondingly embedded into the groove of one winding conductor; the polarity of the permanent magnets embedded into the grooves on two sides of the same screen is opposite, and when the coil of the winding conductor is electrified with alternating current, the permanent magnets drive the screen to vibrate up and down in the grooves of the winding conductor in a suspension manner.

As a further technical scheme, the polarity of the permanent magnet embedded into the groove on the left side of the screen is an N pole, and the polarity of the permanent magnet embedded into the groove on the right side of the screen is an S pole.

The invention has the beneficial effects that:

1. the electromagnetic vibrator is adopted, so that non-contact vibration can be realized, and no noise pollution is caused when the equipment runs;

2. the vibration frequency is adjustable, the amplitude is stepless and adjustable, and the material applicability and the screening effect are improved;

3. by adopting the structural form of vibrating the screen surface and not vibrating the screen frame, compared with the traditional vibrating screen, the vibrating weight of the whole machine is greatly reduced, the weight of the whole machine can be greatly reduced, and the energy is saved;

4. the sectional type curve screen surface utilizes the principle of equal-thickness screening to quickly diffuse materials at the feed end, thereby improving the screening efficiency of equipment;

5. the vibration frequency and amplitude of each screen surface can be independently adjusted, so that the applicability of different materials and the screening effect of the whole machine are greatly improved;

6. because the mechanical transmission of a motor and a vibrator is omitted, the failure rate and the occupied area of the equipment are reduced, and the overall operation cost of the equipment is reduced.

Drawings

Fig. 1 is a front view of the structure of the present invention.

Fig. 2 is a side view of the structure of the present invention.

Fig. 3 is a schematic diagram of the winding conductor and the permanent magnet.

Description of reference numerals: the screen cloth 1, permanent magnet 2, reel 3, support 4, winding conductor 5, recess 6.

Detailed Description

The invention will be described in detail below with reference to the following drawings:

example (b): as shown in fig. 1 and 2, the vibrating screen with the vibration exciter comprises a screen mesh 1, the vibration exciter, a screen frame 3 and a support 4, wherein two layers of screen surfaces (two layers or more layers in the embodiment) are arranged in the screen frame 3, each layer of screen surface is formed by sequentially connecting a plurality of levels (four levels in the embodiment) of screen meshes 1 at certain intervals in a segmented manner from bottom to top, so that the screen surfaces gradually tilt upwards from left to right and are curved, the support 4 is arranged on the left side and the right side of the screen frame 3 and used for supporting the screen frame 3, and the height of the support 4 on the right side is higher than that of the support 4 on the left side; each screen mesh 1 is provided with a vibration exciter, the vibration exciter comprises permanent magnets 2 fixedly arranged on two sides of the screen mesh 1 and winding conductors 5 fixed at corresponding positions on the screen frame 3, each winding conductor 5 is provided with a groove 6, and each permanent magnet 2 is correspondingly embedded into the groove 6 of one winding conductor 5; the polarity that same screen cloth 1 both sides permanent magnet 2 was embedded in recess 6 is opposite (as shown in fig. 3, in this embodiment, the polarity that screen cloth 3 left side was embedded in recess 4 is the N utmost point, and the polarity that screen cloth 3 right side was embedded in recess 4 is the S utmost point), and when winding conductor 5' S coil circular current, permanent magnet 2 drove screen cloth 1 and suspended vibration about in recess 6 of winding conductor 5. The adjustment of the vibration frequency of the screen 1 and the stepless amplitude modulation of the vibration amplitude are realized by controlling the frequency and the size of the alternating current.

The working process of the invention is as follows: during screening operation, alternating current is conducted on a coil of the winding conductor 5, referring to the attached drawing 3, the outside of the permanent magnet 2 on the left side of the screen mesh 1 is an N pole, the outside of the permanent magnet 2 on the right side is an S pole, an induced magnetic field is instantly generated by the winding conductor 5 on the left side of the screen mesh 1, the upper part is an S level, the lower part is an N level, and the lower part is thrust and suction according to the principle that like poles repel and opposite poles attract, the lower part on the left side of the screen mesh 1 is; meanwhile, the induced magnetic field generated by the winding conductor 5 on the right side of the screen mesh 1 is opposite in direction, so that the lower part of the right side of the screen mesh 1 is also pushed, and the upper part of the right side of the screen mesh is attracted. The screen 1 is accelerated to suspend. With the change of the alternating current direction, the direction of the induced magnetic field generated by the winding conductor 5 is changed, and the screen mesh 1 is accelerated to sink. Therefore, the screen can rapidly vibrate up and down in a reciprocating manner by controlling the frequency and the size of the alternating current, so that the function of screening materials is achieved; meanwhile, the vibration amplitude and the frequency of the screen 1 can be adjusted in a stepless manner, and each screen 1 can be independently adjusted.

It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.

Claims

1. The utility model provides a take shale shaker of vibration exciter which characterized in that: the vibration exciter comprises a screen (1), a vibration exciter, a screen frame (3) and a support (4), wherein at least one layer of screen surface is arranged in the screen frame (3), each layer of screen surface is formed by sequentially connecting a plurality of levels of screen (1) from bottom to top at certain intervals in a segmented manner, so that the screen surface gradually tilts upwards and is in a curve shape, and the support (4) is arranged on the left side and the right side of the screen frame (3) and used for supporting the screen frame (3); each screen (1) is provided with a vibration exciter for adjusting the vibration frequency and stepless amplitude modulation of the vibration amplitude of the screen (1).

2. The vibrating screen with a vibration exciter of claim 1, wherein: the vibration exciter comprises permanent magnets (2) fixedly arranged on two sides of the screen (1) and winding conductors (5) fixed at corresponding positions on the screen frame (3), a groove (6) is formed in each winding conductor (5), and each permanent magnet (2) is correspondingly embedded into the groove (6) of one winding conductor (5); the polarity of the permanent magnets (2) embedded in the grooves (6) on two sides of the same screen (1) is opposite, and when the coil of the winding conductor (5) is electrified with alternating current, the permanent magnets (2) drive the screen (1) to vibrate up and down in the grooves (6) of the winding conductor (5) in a suspension manner.

3. The vibration exciter-equipped vibration screen according to claim 2, wherein: the polarity that screen cloth (1) left side permanent magnet (2) were embedded in recess (6) is the N utmost point, and the polarity that screen cloth (1) right side permanent magnet (2) were embedded in recess (6) is the S utmost point.