Vibrating machinery is widely used in various industrial and mining enterprises, especially in mining and processing industries. It is widely applied in operations such as material feeding, conveying, screening, dewatering, demediuming, crushing, and grinding. Examples include vibrating feeders, vibrating conveyors, vibrating screens, vibrating mills, and vibrating crushers.
In the mining industry and other industrial sectors, various types of vibrating machinery are used extensively. In the production processes of industries such as steel and coal, the handling and processing volume of various raw materials exceeds 1 billion tons, and the transportation volume of mineral processing reaches several billion tons; in these handling and processing links, a large number of mining vibrating equipment such as feeding, conveying and screening are used.
Vibrating feeders, vibrating conveyors, and vibrating screens are used extensively in all stages of the coal production and processing system. Vibrating equipment accounts for a large proportion of the total equipment used in coal preparation plants. Due to the important role of vibrating equipment in the national economy, research on vibrating equipment has been highly valued both domestically and internationally. In recent years, due to increased demand for energy sources such as coal and expanded production capacity, the production of vibrating equipment has seen significant development and rapid technological progress.
1. Application of new technology theories
The traditional self-synchronization principle is used in vibrating machinery. In vibrating machinery, the two main forms of vibration are linear motion and circular motion. The widely used linear vibration generally requires two sets of eccentric blocks to operate synchronously to generate a linear reciprocating excitation force. Previously, forced synchronization was often used, that is, a pair of gears with the same diameter and number of teeth was used to achieve synchronous operation of the two sets of eccentric blocks. However, in recent years, mechanical principles have been utilized to achieve synchronization of the two sets of eccentric blocks without forced connection, which also simplifies lubrication requirements. Many inertial vibrating feeders and linear vibrating screens have adopted the self-synchronization principle for drive, resulting in significant development.
The adoption of the principle of equal thickness screening and the principle of probability screening technology has more than doubled the processing capacity of the screening machine. The use of the principle of probability screening not only improves the processing capacity of the screening machine, but also solves the problem of approximate screening of difficult-to-screen materials.
2. The development of large-scale vibration equipment is relatively rapid.
With the continuous expansion of mines, the production scale of large-scale mining vibration machinery is constantly expanding, technological innovation is accelerating, and new types of machinery continue to be introduced.
(1) Large vibrating feeders have been used in mines in my country. The newly launched 1800t/h and 2500t/h large feeders have reduced the number of feeders installed in the production system, simplified the production process, and improved production efficiency.
(2) Large screening machines are also constantly being developed. Screening machines with a width of 3.6m and a length of 6m and 7.3m are already in use in many mines. The largest screening machine used in China has a width of 4.2m and a length of 9.13m. This creates favorable conditions for the simplification of screening systems.
(3) Vibrating centrifugal dewatering machines are essential dewatering equipment in coal mines. Currently, the TWZ1300 vibrating centrifugal dewatering machine has a processing capacity of 300t/h, a product moisture content of 5% to 9%, and a noise level of less than 80dba.
(4) Larger vibratory mills, with a volume of 1800L and a power of 5565kW, have been used in many places. It is said that the largest volume has reached 3000L and the transmission power has reached 110kW.
3. Improvement of the strength of vibration mechanical parameters
To improve the working efficiency of vibrating machinery in mining, some domestic and foreign vibrating equipment manufacturers have increased the parameters of vibrating machinery while improving the structural strength of the equipment. Foreign circular vibrating screens have amplitudes reaching 12mm (double amplitude), and linear vibrating screens have amplitudes reaching 16mm (double amplitude), with vibration frequencies exceeding 1000 r/min. Vibrating mills have a maximum amplitude of 1214mm, but some issues still exist regarding structural strength.
4. Application of new materials and new processes
(1) The use of non-metallic vibration damping components, such as rubber springs and composite springs, greatly improves the operational stability of vibrating machinery.
(2) The use of non-metallic screen surfaces improves the service life and screening performance of the screening machine screen surface.
(3) The use of ring groove rivets greatly improves the structural strength of the vibrating screen box and the vibrating conveyor body, thereby greatly improving the reliability of equipment operation.
The development and improvement of vibrating machinery plays a very important role in the development of mining and processing industries. The development and application of new technologies and products for mining vibrating machinery is a very important task.
The development of large-scale vibrating machinery requires further in-depth research into structural strength to improve operational reliability. Research into new materials and processes, particularly high-performance materials, should be strengthened to reduce the weight of vibrating machinery and improve product quality.
With increasing environmental protection requirements, the noise reduction of vibrating machinery needs to be studied more deeply and necessary measures need to be taken to control the scope and degree of noise pollution. Mining vibrating machinery should be developed towards high technical efficiency, high efficiency, low noise, low energy consumption, low accident rate, and low wear.
