China's screening equipment industry status and development direction

Compared with foreign countries, the development of vibrating screens in China started relatively late, and has undergone three stages of imitation, self-development and introduction. However, from the current point of view, China's screening machinery manufacturing industry has shown a rapid development trend, especially for private enterprises and Sino-foreign joint ventures.

There are more than 10 screening machines with an annual output value of more than 15 million yuan. The distribution of production (output value) is shown in Figure 2. Currently, the vibrating screen industry centered on Anshan, Xinxiang, Luoyang and Tangshan has been formed. center. It not only promoted the development of the screening equipment manufacturing industry, but also greatly promoted the development of the local economy.
With the increase in capital investment in the “Eleventh Five-Year Plan” of the country, new projects and technological transformation projects in the metallurgical, energy, transportation and hydropower sectors have been increasing, especially the adjustment of the coal industry by the state, and the improvement of the efficiency of the coal industry. It has promoted the construction and renovation of many coal preparation plants, so objectively requires a large number of vibrating screens. In order to meet the needs of growing development, all vibrating screen enterprises and scientific research units in China have made unremitting efforts, drawing on the latest technological achievements at home and abroad, and continuously carrying out independent innovation, and have achieved a series of results. At present, there are more than 50 vibrating screen products. Series, more than 1,000 specifications.

In addition to the commonly used linear vibrating screens, circular motion screens, high-frequency screens, curved screens, string screens, post-screens and banana screens, the main products have also developed a series of novel structures in recent years to adapt to various differences. Vibrating screen products required, such as high-altitude vibrating screen, multi-component high-vibration screen, strip vibrating screen, self-cleaning vibrating screen, elliptical vibrating screen, anti-resonant vibrating screen, soft surface vibrating screen, drum vibrating screen, secondary reduction Vibration vibrating screen, lap-type strong vibrating screen, single-axis excitation elliptical vibrating screen, arthropod screen and relaxation screen. It has greatly enriched the market of screening equipment in China, and provided a larger choice for the selection of manufacturers. At present, some screening equipment products of domestic enterprises have been exported to foreign countries.
At present, a number of powerful screening machinery manufacturers have emerged in China, such as Anshan Heavy Machinery Co., Ltd., Coal Research Institute Tangshan Research Institute, Henan Taihang Vibration Machinery Co., Ltd. and Shanxi Saide Screening Technology Equipment Co., Ltd. Some technologies of these enterprises have reached, approached or surpassed the world's advanced level, and made outstanding contributions to the development of China's screening equipment industry:
(1) In 2009, Anshan Heavy Machinery Co., Ltd. developed the world's largest banana sieve with a screen surface of 39.56 m ² and a screening capacity of up to 2 500 t/h. The product performance, screening area and working efficiency are similar in the world. Ranked first in the price, only about 38% of foreign similar products, the development of this product successfully broke the history of foreign monopoly of this large equipment.
(2) The largest model of high-frequency screen GFS2445 curved screen developed by Tangshan Research Institute of Coal Research Institute passed the acceptance of “National Coal Preparation Machinery Quality Supervision and Inspection Center” in October 2009, and the technical parameters reached the predetermined requirements. Its successful development has completely filled the gap of the current large-scale slime dewatering screen.
(3) In 2008, Henan Taihang Vibration Machinery Co., Ltd. developed the world's largest vibrating screen with a specification of 4 m×10 m and a screen area of ​​80 m ² and a single processing capacity of 1 200 t/h. It was published and obtained the national utility model patent certificate.
(4) The 2ZKP3660 linear screen jointly developed by ZK3660 linear vibrating screen developed by Tangshan Research Institute of Pingmei Coal Research Institute and Anshan Heavy Machinery Co., Ltd. and Pingdingshan Coal Preparation Design Institute has a good effect. In recent years, Anshan Heavy Machinery Co., Ltd. has successfully developed ZKK3675 vibrating screens. These screens have been used on site and have the ability to compete with similar foreign products. Relevant information indicates that the width of the linear vibrating screen is currently 4.2 m.
(5) In recent years, with the improvement of raw coal processing capacity and reliability requirements of large coal preparation plants, China has successfully developed YK36525, YK3645 and DYS3673 circular motion screens, which have been used in the field. The technical characteristics of the product.
Although there are many manufacturers of screening equipment in China, there are few companies with real scale and large scale. Relevant information shows that there are currently about 3 to 4 companies with independent research and development capabilities, and most of them are still relatively old-fashioned products. At the level of product design and manufacturing, there are only about 4 to 5 companies in the country. Equipment and process levels are truly capable of larger screening machinery, and most companies are relatively small.
With the increase screening equipment manufacturing enterprises in China, the production increased beneficiation plant and a coal preparation plant and the gradual saturation, especially since 2008, China in Shanxi, Henan and Inner Mongolia and other places of the strong integration of mineral resources, with emphasis on Some large-scale mining bases have built a number of internationally advanced concentrating plants, restricting small concentrating plants, and objectively restricting the development of some small and medium-sized screening equipment enterprises. In the future, with the formulation and introduction of the national “Twelfth Five-Year Plan”, it is expected China's screening equipment will usher in new challenges. Therefore, in the future, the demand for low-end vibrating screens will tend to be saturated, and the demand for large-end high-end vibrating screen products will gradually increase. Therefore, the competition among the screening equipment manufacturers will become more and more fierce. This kind of competition is not only reflected in the competition among domestic screening equipment manufacturers, but more importantly, the competition among domestic and foreign screening equipment enterprises. The performance is not only the price competition, but more importantly the competition for quality and technology.
In order to enable their respective companies to maintain long-term sustainable development and occupy more and more market share, each screening equipment manufacturer must recognize its position and take various measures to adjust its development focus and direction in a timely manner.

Faced with the new situation, all screening equipment manufacturers should not unilaterally pursue immediate interests, blindly expand the scale, and do not blindly pursue the comprehensive and diversified products, but should consider the direction of development from the following aspects:
(1) Large-scale screening equipment manufacturers not only have to occupy the market, but also learn to abandon the low-end market, transfer non-critical parts processing to small and medium-sized screening equipment manufacturers, and focus on new product development and technology updates. In the new technology to create the market and lead the market, we must change from technology-leading to technology-leading.
Because the technology leading of large-scale screening equipment manufacturing enterprises is always relative, and the peers are developing, in the increasingly fierce market competition, it is difficult to realize the significant differentiated competition from the key issue of hardware products. The technology leader requires large-scale vibrating screen enterprises to achieve advanced in the existing market areas. At the same time, it is necessary to emphasize that large-scale vibrating screen enterprises must first change from passive adaptation to market to actively guide market development, and guide the demand through technology to make the market continue. Expanded and the customer base continues to grow.
(2) Small and medium-sized screening equipment manufacturers can enhance their own strength and enhance their competitiveness by the following methods. 1 Through the joint approach, optimize and integrate the superior resources of each enterprise; their respective enterprises carry out division of labor, such as specializing in the processing of certain parts and parts, improve the processing level of parts; mainly engaged in the whole machine equipment, improve the level of equipment, and engage in market sales. And after-sales service, to improve the competitiveness of the vibrating screen market. 2 It can form a processing base for vibrating screen industrial parts of large-scale enterprises by manufacturing related parts for large-scale screening equipment, and rely on the leading role of large-scale enterprises to obtain more living space and benefits. . 3 Due to the flexibility of small and medium-sized screening equipment manufacturers, they can quickly occupy the market gaps of large-scale enterprises and quickly occupy these market shares, so as to improve their ability to compete with large enterprises.

(1) Using advanced analytical techniques for optimization analysis Based on the advanced technology and successful experience of domestic and foreign screening equipment manufacturing enterprises, using various finite element analysis software (ANSYS, ALGOR, ADAMS, etc.) and advanced vibration testing Based on the analysis of the test technology, the vibration sieve and its key components were optimized and analyzed, and the dynamic characteristics and structural strength were studied to further optimize the structural design and improve the reliability of the whole machine. In addition, various vibration sieves were used. Fatigue analysis to explore the stress, strain and service life of the long-term work process.
(2) Studying the relationship between various technical parameters of screening equipment for different coal quality At present, China's coal quality is diverse, and different technical requirements for various vibrating screen products are also proposed. Because the screening technology is not only a simple screening, but also has a very close relationship with the coal preparation process. The diversity of the coal preparation process and the characteristics of each coal preparation process have special requirements on the particle size and efficiency. If you can better cooperate with the coal preparation technology and maximize the performance of the respective equipment, so that the technical parameters are at their best, it is necessary to study various vibration screen technologies for different coal quality conditions. The relationship between parameter indicators is refined and standardized.
(3) Strengthening the research of processing technology At present, vibrating screen often has the phenomenon of screen beam fracture, side plate fracture and sieve plate damage during work, which is inseparable from its processing technology. Therefore, research on strengthening the strength of screen frame is the key to technology. . The main problems are side plate cracking, screen frame deformation, etc. The welding, riveting process and screen frame structure should be studied; the fixing reliability of the screen plate is also a technical key. It is necessary to study the fixing method and the anti-loose structure with high reliability; The device is a key component on the vibrating screen. It is necessary to study the vibrator of the new structure. The sieve plate is also a key component of the vibrating screen. It is necessary to use new materials and new processes to improve its service life; high temperature and anti-coagulation of bearing grease Special research on anti-vibration and fatigue resistance of rubber springs.
(4) Research on strengthening the material of screening equipment At present, domestic vibrating screen materials generally use Q235-A steel plate and No. 20 steel pipe, etc. The material properties are quite different from those of foreign countries, which is also a factor that causes the vibrating screen to have a relatively low life. At present, the domestic vibrating screen life is generally about 1 to 3 a, while the foreign ones reach 5 to 10 a, which also causes an increase in the production cost of the manufacturer. Therefore, screening equipment manufacturers and steel manufacturers to carry out research on vibrating screen materials, to study a new material more suitable for vibrating screens, is also an important direction for future research.
(5) Research on strengthening wear-resisting and corrosion-resistant problems Since vibrating screens are generally in very harsh environments, the angle brackets on both sides of the screen box, the screen beam and the fixed screen plate beam are very long after work. It is prone to wear and corrosion. The beam is not welded or sealed well, and the liquid easily flows into the beam and is also prone to corrosion, thereby reducing the service life of the vibrating screen. In addition, the corners or slits of the screen structure below the sieve plate are also susceptible to corrosion due to the retention of the wet material.
In order to improve the service life of the vibrating screen, the components are generally subjected to wear-resisting and anti-corrosion treatment. However, at present, only wear-resistant materials such as rubber on the surface of the component are used in the manufacturing process, which not only has low work efficiency but also relatively high cost. Therefore, combining chemical rubber or wear-resistant material technology with mechanical manufacturing, researching an advanced technology for spraying anti-corrosion or wear-resistant materials, and solving the problem of wear and corrosion resistance of components on the surface is also an important direction for future research.
(6) The method of reducing the working noise of the screening equipment is generally in the production process, the noise generated by the vibrating screen is unavoidable, but from the current point of view, the domestic vibrating screen works generally with a large noise, in order to reduce the noise, each screen Sub-equipment manufacturing companies and related research institutions have conducted good research and analysis, and proposed various methods and measures, such as: replacing the metal coil spring with a rubber spring, replacing the metal sieve plate with a polyurethane sieve plate, on the side of the sieve box The board is provided with a constrained damping layer, and the flexible spoke gear is used instead. The noise is also considered to reduce the noise from the vibration isolation angle. However, the range of noise reduction is generally not too large. Therefore, the method for reducing noise in the future is studied. It is also an important research direction.

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