New technology and new technology of friction and bounce beneficiation--- sorting equipment

Friction and bounce concentrators are mainly: slippery board, belt type screen and backflow screen. Among them, the slippery board is fixed and the rest is sporty. The description is as follows.
(a) slippery board
The slippery board is the most basic and simple equipment for asbestos dressing. It is just an upwardly bent end (Qiaoqi) iron plate. It can be a single piece of iron or a multi-piece iron plate in multiple sections. Figure 1 is a schematic diagram of a parallel two-system multi-segment device configuration, which is a more complicated configuration for asbestos selection. If you only choose rough asbestos, you can use a configuration.

The calculation formula of the production capacity of the slippery board is Q=3600μρhBυ, t/h
In the formula μ———the looseness coefficient of the moving material, generally μ=0.3～0.5;
ρ———material density, generally 2.5～2.8t/m ³ ;
h———the thickness of the material layer on the feeding belt, m;
B———the width of the material layer on the feeding belt, m;
υ———The speed of material movement on the feeding belt, m/s.
(2) Belt sieve
The asbestos sorting belt screen is essentially a slanted belted belt with a rapping device. The belt surface may be a woven screen or a grooved tape. When the belt is transported upwards, it has a slight vibration (generated by the rapping device), causing the ore to have a slight bounce on the screen surface. The angle of inclination of the belt is larger than the friction angle of the gangue particles, which is smaller than the friction angle of the asbestos fibers, so that the asbestos fibers can stay on the screen surface, and the gangue particles cannot stay on the screen surface.
The material is fed by the lower half of the belt. Due to the vibration of the belt surface, the gangue particles collide with the screen surface to rebound back to the lower part of the belt. At the same time, since the angle of inclination of the belt surface is larger than the friction angle of the gangue, it will be along The screen slides and rolls down, and finally discharges from the lower end of the belt, and the asbestos fibers collide with the belt surface without plastic rebound, and the asbestos fibers do not slide down the belt because the angle of inclination of the belt is smaller than the friction angle of the asbestos fibers. Instead, it is driven by the screen surface and moves upwards together with the screen surface, and finally discharged from the upper end of the belt. In addition, during the movement of the material, due to the vibration of the belt surface, some fine particles pass through the sieve hole and are discharged from the sieve to become the middle mine. [next]
(3) Backflow screen

The structure used for the asbestos sorting counterflow screen is shown in Fig. 2. The device is essentially a rocking screen. In order to meet the requirements of sorting asbestos, the screen on the screen box is installed in a plurality of inclined states that are not connected to each other. The inclination angle of the screen is 18°. The inclination angle of the screen is about 30°. The inclination angle of the screen is adjusted to be such that for the asbestos fiber with a large friction coefficient, the frictional force is greater than the gravity component of the particle sliding down the slope. Still basically staying on the inclined surface to move with the inclined surface. When the inclined surface changes from the upward movement to the downward movement, the asbestos fiber still maintains the upward movement trend, and is thrown upwards, and its performance is to throw a distance forward on the screen; The gangue particles with small friction coefficient move in the oblique direction upwards, because the frictional force is smaller than the gravity component of the particles sliding along the slope, and the sloping or rolling down along the slope, after the slope changes from the upward movement to the downward movement, the particles It still maintains a tendency to move down the slope. Each time the screen box is shaken, the asbestos fibers are advanced upwards for a distance, and the gangue particles are retracted a distance downward. As the sieves are shaken constantly, the asbestos fibers continue to move upwards, the gangue particles continue to recede, and the asbestos fibers and gangues are separated from each other.
In order to satisfy this separation of the screen, the feedstock should be fed to the lower part of the screen box near the gangue discharge. The asbestos fibers are discharged from the upper end of the screen box, the gangue is discharged from the lower end of the screen box, and the medium ore is discharged through the screen.
The screen box 1 of the backflow screen is supported on the frame 5 by rigid 6 legs 3. Both ends of the eccentric shaft 7 are mounted on the bearing body 10 supported by the four sub-legs 11. Both ends of the main link 2 are respectively connected to the screen box 1 and the eccentric shaft 7. The center of the double toggle lever 12 is hinged to the frame by a rubber bushing, and the two ends are respectively connected to the screen box 1 and the bearing body 10. In addition to the screen mesh on the screen box 1, there is also a cover plate 6.
The screen box 1 is driven by the motor to drive the eccentric shaft 7 to generate a rocking motion through the main link 2. Due to the action of the double toggle lever 12, the eccentric shaft 7 and the screen box 1 are caused to move in equal and opposite directions. The pulley 8 of the eccentric shaft 7 has an eccentric device. The device is mounted at an angle to the eccentricity of the shaft such that the center distance of the two pulleys 8 remains unchanged, and the eccentric shaft 7 both rotates and translates. Since the inertial force generated by the flywheel on the eccentric shaft 7 and the inertial force generated by the screen box 1 cancel each other, the vibration of the sieve is reduced, and the movement balance of the sieve is achieved. Moreover, due to the action of the double toggle lever 12, the screen box 1 is guaranteed to have a constant amplitude, so that the sieve works smoothly. However, the structure is complicated and the maintenance is inconvenient.
Another simple construction of the backflow screen is also used in China, as shown in Figure 3.

It does not have damping devices such as bearing bodies, double toggles, and balance flywheels. Therefore, its structure is simple and the maintenance is convenient, but due to the absence of the vibration damping device, the movement of the sieve is unbalanced and the vibration is large.

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