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Product Description
In the black metallurgical sintering production process, the sintering trolley, as the core operating component of the sintering machine, is a key hub connecting material handling and sinter forming. Its performance directly determines the output, quality and production efficiency of sinter ore, and it is also the "mobile carrier" that ensures the continuous and stable operation of the sintering production line. From the circular transmission between the head and tail wheels of the sintering machine to the full-process bearing of mixed materials during preheating, sintering and cooling, the sintering trolley always adheres to its position in the harsh environment of high temperature, wear and dust, and has become one of the indispensable core equipment in the metallurgical industry.
I. Core Definition and Core Functions of Sintering Trolley
The sintering trolley is the main operating component of the sintering machine, and its core function is to form a closed operating rotary chain between the head wheel and tail wheel of the sintering machine to form a circular transmission system. Its working process can be summarized as a closed-loop cycle of "acceptance—sintering—cooling—return": on the upper horizontal section, the trolley receives the sintering mixed materials conveyed from the distributing system, and then successively goes through preheating ignition, high-temperature sintering, cooling and other processes to complete the forming process of sinter ore; after the materials are cooled and formed, the trolley completes the turning action at the tail wheel, unloads the sinter ore to the subsequent conveying system, and returns to the head wheel to enter the next cycle, ultimately achieving the goal of continuous production of sinter materials.
As the "mobile workbench" of sintering production, the sintering trolley not only undertakes the tasks of bearing and conveying materials, but also directly affects key indicators such as thermal efficiency and air leakage rate during the sintering process. Its operational stability and service life are directly related to the operating rate, production cost and environmental benefits of the sintering production line, and it is the core link connecting various systems of the sintering machine and ensuring continuous production.
II. Structural Composition and Functions of Each Component of Sintering Trolley
The structural design of the sintering trolley is centered on the core requirements of "high temperature resistance, wear resistance, tight sealing and easy maintenance". The structures of different types of trolleys are slightly different, but the core components are basically the same, mainly including trolley body, wheels, sealing device, grate bars, side plates, wear plates, thermal insulation pads, etc. Some split-type trolleys also add trolley boxes and other components. All components work together to ensure the stable operation of the trolley and the efficient progress of the sintering process:
(1) Core Bearing Components: Trolley Body and Trolley Box
The trolley body is the basic bearing structure of the sintering trolley, bearing the weight of materials and various components. Its material needs to have excellent high temperature resistance and deformation resistance to adapt to the high temperature environment of 300~800℃ during the sintering process (the local area in contact with materials can reach above 1000℃) and the impact of alternating cold and hot stresses. The trolley body of the integral trolley is an integrated structure, while the split-type trolley connects the trolley body and the trolley box through bolts. This design can reduce the weight of the trolley with the same area by 5%~10%, reduce equipment investment and project cost, and reduce air leakage at the joints. The rationality of the trolley body structure directly determines the bearing capacity and service life of the trolley, and its lower beam design needs to avoid thermal deformation to ensure long-term operational stability.
(2) Transmission and Traveling Components: Wheels and Axles
Wheels and axles are the core components for the trolley to realize circular movement. They are usually symmetrically installed at the lower part of the trolley body, and cooperate with the sintering machine track to drive the trolley to run stably between the head and tail wheels. The wheels need to have high strength and high wear resistance to adapt to the continuous operation needs of the sintering production line. Their operating status directly affects the traveling stability of the trolley and avoids problems such as deviation and rail gnawing. The bearing supporting the trolley wheel is a key vulnerable component. Traditional bearings often suffer accelerated wear due to uneven lubrication. Through modifications such as optimizing the oil channel design and adopting self-lubricating bushings, the service life of the bearing can be effectively improved, and equipment failures and shutdown losses can be reduced.
(3) Sealing and Thermal Insulation Components: Sealing Device, Thermal Insulation Pad and Wear Plate
The sealing device is symmetrically fixed at both ends of the lower part of the trolley body, and its core function is to reduce the air leakage between trolleys, reduce the total air leakage rate of the sintering machine, and improve thermal efficiency and sinter output—the sealing design of the split-type trolley can reduce the air leakage at the joints by half, reduce the total air leakage rate of the sintering machine by 5%~10%, and then achieve an output increase of about 5%. The thermal insulation pad is laid between the upper part of the trolley body and the grate bars, mostly adopting an arch structure with steps at the four corners, which can effectively isolate the high temperature of materials, avoid thermal deformation of the lower beam of the trolley body, and protect the internal components of the trolley from high temperature damage. The wear plates are assembled at both ends of the trolley body, usually four, which can reduce the end face impact wear between trolleys, extend the service life of the trolley, and solve the pain point that the sealing device is not easy to maintain.
(4) Material Bearing and Ventilation Components: Grate Bars and Side Plates
The grate bars are installed on the upper part of the trolley body and arranged uniformly. Their core function is to bear the sintering mixed materials, and at the same time provide channels for air extraction during the sintering process, ensuring that hot air penetrates the material layer evenly and the sintering reaction proceeds fully. The grate bars need to have the characteristics of high temperature resistance, wear resistance and good air permeability, so as to avoid damage caused by material impact and high temperature corrosion, which affects the sintering effect. The side plates are installed on both sides of the trolley body to prevent material spillage and ensure that the materials complete the entire sintering process in the trolley. Their structural design needs to adapt to the running track of the trolley and avoid interference with other components of the sintering machine.
III. Types and Core Technical Features of Sintering Trolley
According to the structural form, sintering trolleys are mainly divided into two categories: integral trolleys and split-type trolleys. The two have different focuses on structural design and performance characteristics, and can adapt to the needs of sintering production lines of different scales:
(1) Integral Sintering Trolley
The integral sintering trolley adopts an integrated trolley body design, with compact structure and strong rigidity, suitable for sintering machines below 265m². Its core characteristics are high thermal efficiency, large usable area and convenient maintenance. Through the optimized design of wear plates and thermal insulation pads, it effectively improves the shortcomings of easy deformation of the lower beam of the car body and inconvenient maintenance of the sealing device, can reduce the wear between trolleys, extend the service life, and reduce production and maintenance costs.
(2) Split-type Sintering Trolley
The split-type sintering trolley is optimized on the basis of the integral trolley, adding a trolley box and adopting a bolt connection structure. In addition to the core advantages of the integral trolley, it also has the characteristics of light weight, low air leakage rate and small wear. Its reduced weight can reduce equipment operation energy consumption, and the reduced air leakage rate can improve sintering efficiency and output. At the same time, it completely eliminates the end face impact wear of the trolley on the return lane, further extending the service life of the equipment. It is suitable for large-capacity sintering machines such as 400m² and 450m², and can also be customized according to user needs.
Regardless of the type, the core technical characteristics of the sintering trolley are centered on "high efficiency, durability and energy saving". Through material upgrading and structural optimization, it achieves the goals of improved thermal efficiency, reduced air leakage and convenient maintenance, providing support for cost reduction and efficiency increase in sintering production.
IV. Application Scenarios and Operation & Maintenance Upgrade of Sintering Trolley
(1) Application Scenarios
The sintering trolley is mainly used for sintering operations in large-scale black metallurgical sintering plants. It is the core supporting equipment in the suction sintering process. It works together with sintering machines, head and tail sprockets, air suction devices, tracks and other equipment to sinter concentrate powder and rich ore powder of different components and particle sizes into lumps, and partially eliminate harmful impurities such as sulfur and phosphorus in the ore, providing high-quality raw materials for blast furnace ironmaking. It has a wide adaptation range and can meet the production needs of sintering machines of different specifications from 18㎡ to 600㎡. Whether it is a new sintering production line or the upgrading and transformation of an existing production line, a suitable specification of sintering trolley can be selected according to the output, site and other conditions.
(2) Operation & Maintenance and Technical Upgrade
Due to the long-term operation in the harsh environment of high temperature, wear and alternating cold and heat, the operation and maintenance of the sintering trolley is crucial. The traditional operation and maintenance mode mainly relies on manual inspection and regular maintenance, which has pain points such as lagging detection, high labor intensity and frequent unplanned shutdowns. With the development of intelligent technology, the operation and maintenance of sintering trolleys has transformed into digital intelligence. The sintering machine trolley digital intelligent operation and maintenance system developed by MCC Changtian integrates AI vision, laser sensing and data intelligence technology, realizing intelligent diagnosis of components such as grate bars, side plates and wheels, as well as real-time analysis of the material surface and the tail section. It can increase the detection real-time by 90%, reduce unplanned shutdowns by 60%, reduce the inspection intensity by 90%, and the annual comprehensive benefit reaches 14 million yuan per line.
At the same time, aiming at the core pain points in the operation of the trolley, the industry has achieved performance upgrading through a number of technological transformations: optimizing the wheel bearing lubrication system, adding bilateral independent oil channels to solve the problem of uneven lubrication and realize "zero failure" operation of the bearing; upgrading the trolley body and grate bars with high temperature and wear resistant materials to improve the corrosion resistance and wear resistance of the equipment; developing an automatic trolley switching system to realize efficient and immediate replacement of the trolley, reduce the shutdown cooling time and improve production efficiency. In addition, the application of a special sintering trolley detection platform can accurately measure the deformation of the trolley body and the wear of the wheels, providing a scientific basis for trolley maintenance and quality inspection, and further ensuring the stable operation of the equipment.
V. Industry Development Trends and Prospects
With the transformation of the metallurgical industry towards greenization, intelligence and high efficiency, the development of sintering trolleys also shows a clear trend: in terms of materials, it will further develop new materials with high temperature resistance, thermal fatigue resistance and light weight, reduce equipment weight and energy consumption, extend service life and reduce operation and maintenance costs; in terms of structural design, it will continue to optimize the sealing structure and split-type design, further reduce the air leakage rate, improve thermal efficiency, and adapt to the needs of large-capacity and high-output sintering machines; in terms of intelligence, it will promote the wide application of digital intelligent operation and maintenance systems, combine big data and Internet of Things technology to realize real-time monitoring, fault prediction and intelligent regulation of the trolley operation status, and promote the transformation of sintering production from "experience-based sintering" to "digital sintering".
As the core equipment of sintering production, the technical upgrading of sintering trolleys will directly promote energy conservation, carbon reduction and efficiency improvement in the metallurgical industry. In the future, with the continuous innovation of technology, sintering trolleys will play a more important role in ensuring production stability, reducing production costs and reducing environmental emissions, providing solid support for the high-quality development of the black metallurgical industry.
