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Lump ore vibrating screen for mining
The structure and characteristics:
A. Block screen segment screening, screening machine overall vibration, vibration sieve screen and block the traditional vibrating screen is different, it is not involved in the whole vibration sieve machine, plate, top cover and the base are fixed, only the screen and the vibration exciter assembly in vibration.
B. Self-cleaning screen block is composed of cantilever bar and
C. Closed structure block used in high concentration dust screen condition, usually made of closed structure, the dust cannot leak, in response to the requirements of environmental protection.
D. Amplitude larger and smaller dynamic load block due to the screen and the screen vibration process characteristics of body vibration sieve, sieve machine so dynamic stress can be reduced to a minimum, so the amplitude can be greatly improved, it can greatly reduce the dynamic load.
Overview:
1. Exciter and damping spring of lump ore screen are located within the screen box.
2.Vibrating part is completely contained inside the sieve, and the outside sieve body does not vibrate.
3. Using two motor drive.
4.Lump ore screen has a single-layer double-sided self-cleaning cantilever rods, maintenance-free exciter, combination of sealing structure and other components.
5.Exciter directly driven sieve plate vibration, and the sieve body does not participate in vibration. Amplitude :15mm-25mm.
Features:
1.Vibration motor install in the sieve outside, is conducive to the maintenance of motor replacement.
2.Using single-layer double-sided self-cleaning cantilever rod, effectively solve the plugging phenomenon, improve the screening efficiency.
3.Exciter is through the two ends of the two drive shaft connected together structure, this structure reduces the weight of the bearing chamber.
4. Exciter inside the package in the sieve box to reduce noise and increase personal safety.
5. Exciter with thin oil lubrication, a oiling, maintenance-free process, an effective solution to the grease lubrication high temperature of the drawbacks of poor lubrication.
6.Self-heat dissipation: The use of hollow shaft structure, the hollow shaft with rotating vents connected ventilation holes, so that the shaft during rotation in the shaft temperature through the blade rotation out of the shaft.
7.Combination seal structure: the overall structure of the exciter with a complete sealing arrangement, bearing room and support plate, between the maze cover and the rotating shaft, through-hole cover and bearing room contact surface, through-hole cover and sleeve and so on Increase the seal, effectively avoid oil leakage when the exciter rotates.
8.Excitation source and screen box sealed between the use of special rubber made of special seals, with high wear resistance, flexibility and other advantages.
Applications:
1.Suitable for blast furnace trough, lime kiln, sand aggregate material screening of small particles.
2. Widely used in wet tide, high powder content of the screening material.
3. Ironworks, coke plants, steel plants and other industries.
Screening mechanism:
The screen block screen wet dry sieving sticky ore is a problem of domestic and international screening technology, because the wet sticky ore bound group, loose adhesion difficult or make effective screening area on the screen to reduce screening efficiency declines. Lump ore is not loose, not layered, the overall movement, so that screening process is difficult to complete. Therefore, the wet sticky ore is screening and screening industry problems that should be solved urgently. Block is the use of large amplitude, large screen vibration intensity, low frequency and self cleaning screen surface to complete the wet sticky ore screening process. According to the traditional screening theory, the screening process can be divided into three stages: loose, layered and penetrating. Delamination is the condition for the completion of the screening process. In the water block ore is low, ash is small, because ore, lump ore and sieve between no cohesive or cohesive force is small, good liquidity ore, as long as the ore particles than the mesh size, the relative speed between the particles and the screen, ore particles it can be less than sieve through the screen. However, screening process for the wet sticky ore is completely different. The viscosity of ore increased, the loose stratification becomes difficult, liquidity ore becomes worse, then you need to have a large enough acceleration between ore and screen, it is possible to make the loose, layered ore. But the acceleration is not enough, because we need time and space screening process of wet sticky ore, the vibration of the screen surface too fast, ore throw up, eventually not sieving effect. In addition, the particles through the sieve also need time to complete, large amplitude, vibration intensity, low frequency block screen just to meet the characteristics of this screening process. In theory, between ore, ore and the screen between the bonding force has a limit, when the excitation force is greater than the sieve surface adhesion between ore and sieve, ore out of the screen, so that the separation between ore and active, screen will not block, effective screening the process can be. However, the smaller the particle size, viscosity and inertia force was also smaller, which makes small particles required to obtain greater acceleration is possible, in fact, not many discrete particles exist, they are always adhered to the larger particles, are bonded to each other. Large amplitude, large vibration intensity is beneficial to cut off the bond force between the blocks, forcing the ore block forced screen.
A comparison with the traditional vibration sieve ：
Lump ore screen is a vibration screen, of less than 13mm wet sticky ore block is superior to the traditional screen , vibrating screen. Key indicators to distinguish between two kinds of advantages and disadvantages in sieve screening efficiency. The wet sticky mine blockage is the main factor affecting the sieve screening efficiency. Fine ore is mainly due to plugging hole, ore high moisture, high ash, high viscosity and geometry. And the most effective means to solve the clogging of the sieve is to improve the amplitude and improve the screen surface structure. But the traditional vibrating screen is the overall vibration, the stiffness is limited, if the increase amplitude, vibration intensity will increase, the screen box fatigue speed will be increased, the screen box beam crack, vibration breaking phenomenon will appear, the sieve soon scrapped fatigue. Block screen is segmented screen, screen vibration sieve box does not participate in the vibration, so the screen box without the dynamic stress amplitude, sieve can refer to 25mm. Due to the small mass of vibration, the dynamic load is much smaller than that of the traditional vibrating screen. The main characteristic of self cleaning screen surface is also a griddle, does not have the traditional vibrating screen. Self cleaning screen surface can really solve the problem of the wet sticky ore gradually bond. Block screen from the traditional vibrating screen, which is superior to the traditional vibrating screen.
The installation and debugging:
Debugging before delivery and installation work correctly is very
A. installed base of fixed size, the correct position, so as to ensure the correct position of the sieve, to ensure stable operation of the equipment. The axis of the
B. motor and the axis of the exciter should be in a straight line.
C. installation of distributor, the baffle must pay attention to the scale, size, position iscorrect,donot occur during operation and impact sieve
D. screen installed, and the installation of electrical equipment, power supply is switched on.
E. debugging: after the installation to commissioning and debugging, should check all parts of the installation is correct before starting the first move by hand coupling, observe whether resistance card, check the circuit connection is correct, no problem after the boot.
Use and maintenance:
Sieve mesh is the main working parts of sieve ,steel wire mesh is made of a sieve at certain intervals are fixed on the sieve plate, silk screen has a certain flexibility, can produce two materials after impact vibration, is conducive to the material through the screen. Vibration sieve should be in the screen surface without the material to start, as far as possible to avoid the boot with the machine, the screen machine running smoothly after feeding. Before stopping the machine should stop feeding the material to be screened and then stop. The vibration of bearing, every week of work to add a molybdenum disulfide lithium grease lubrication, the gas should pay attention to clean and oil filling quantity, filling quantity should not be too much, otherwise it will cause the bearing heating. After leaving the factory before the installation of vibrating screen, such as more than 6 months, before mounting bearings in the vibrator must be removed for cleaning, then inject new grease. The vibrator to the assembly, hand rotating eccentric block or the resistance is too large or stuck phenomenon, or should timely find out the reason to be adjusted. Vibrator bearing temperature, temperature rise requirement does not exceed 45 DEG C, the highest temperature does not exceed 75 degrees C.
Each class should be done before the start of the following work:
A. check the various parts of the bolts are loose, if loose, timely tightening.
B. check whether the damaged parts of the force, found the problem in a timely manner.
C. check the screen wire, if damaged to be replaced.
D. check for clogged screen, such as debris to clean up.