At present, the inclined screen is one of the equipment which has more problems and larger maintenance in various mining machinery equipment in our country. These problems are prominent in the screen box broken beam, crack, thin oil lubricated vibrator oil leakage, gear teeth beating, bearing temperature rise is too high, loud noise and other problems, accompanied by the transmission belt jumping belt broken belt and other failures. Such problems directly affect the service life of inclined screen and seriously affect the production efficiency. inclined screen is discussed by our company, including inclined screen classification and characteristics, and the design scheme is determined. The motion analysis of the material, the inclined screen dynamics analysis and the calculation of the dynamics parameters are carried out, and the inclined screen structure size is reasonably designed. The eccentric block design and calculation of the shaker (including the original design parameters) are carried out. Bearing selection and calculation, and motor design and check; The main parts of the design and calculation, such as belt design calculation and check, spring design calculation, shaft strength finite element analysis, and then carried out the equipment maintenance, installation, lubrication and seal design.
Materials extracted or crushed from underground or surface mining are mixed together in particles of various sizes. In concentrators, coal preparation plants, and other industrial sectors, materials often need to be divided into several grades of similar size before use or further processing. Material through the screen surface through the hole classification is called screening. The machinery used in screening is called screening machinery. There are many structural types of screening machines used in concentrator and coal preparation plant, such as fixed screen, curved screen, swirl screen, roller screen, simple screen, shaking screen, inertia inclined screen and resonance screen. Currently, due to the advantages of simple structure, large production capacity and high screening efficiency, the inertial inclined screen has been widely used in classifying, dehydrating, demediating and desliming operations in mineral preparation plants, coal preparation plants and other industrial sectors. Resonance screen in the production practice has also achieved better results, but because of the larger impact load, so its parts (such as beam and side plate) easy to damage. Further study and improvement are needed. With the improvement of coal mining capacity and raw coal amount, the inclined screen, as the main equipment for material classification and screening, is also developing to a larger size.
Circular motion inertia inclined screen is a screen machine using a screen box with an eccentric shaker block to achieve vibration, which
The motion is generally circular or approximately circular (oval). It has a simpler structure than a straight inclined screen with two axes
Single, low manufacturing cost and less maintenance work, so it has been widely used in industry. Circular motion inclined screen can be divided into simple inclined screen and self-centered inclined screen.
3.1 Simple inclined screen
This inclined screen is characterized by the shaker's axis line in a straight line with the center of the pulley, thus the leather
Both the belt wheel and the shaker shaft participate in the vibration, making the screen machine usually operate in a state far above resonance.
The advantages of the simple inertia inclined screen are simple construction and easy manufacturing. It has the disadvantage of having a pulley and screen
The box vibrates together. No matter the motor is installed at any Angle, the periodic change of belt transmission center distance cannot be avoided.
The triangle belt causes repeated length and shortening, affecting its service life. To ease the life of the belt
Influence, triangle belt must choose longer.
3.2 Customize the center inclined screen
When the screen machine is running, the self - inclined screen triangular pulley does not vibrate with the screen box. The advantage of this screen machine is that the transmission belt life is longer and the work is more stable.
3.3 Other forms of circular vibrating sieve
Some circular motion inertia inclined screen using universal coupling or tire coupling direct transmission, cancel the belt pulley, so as to overcome the belt expansion and life is not long shortcomings. The main differences between the various uniaxial inertial inclined screen constructions are as follows.
1. Type of vibrator: long shaft drum type vibrator and short axle box type vibrator.
2. The structure of the screen box and the number of layers of the screen surface: the screen box has two shapes, parallelogram and upper approximate triangle. The number of layers on the inclined screen surface is single layer. The division of double layer and multilayer.
3. The type and support mode of vibration isolator: the type of vibration isolator has metal coil spring, rubber spring, plate spring, compound spring and air spring, etc.; Its support mode has suspension type and support type of two; In addition, there are primary isolation and secondary isolation. The vibrator type of this design is only long shaft drum type, the sieve box structure is the upper approximate triangle, the number of screen surface is single layer, the vibration isolator is rubber spring, the support mode is the support type, the number of vibration isolation is once.
