Application of Heavy Duty Apron Feeder in Construction Stone Crushing Production Lines
Introduction
In the modern construction engineering field, the continuous depletion of natural sand and stone resources has driven the use of manufactured sand and stone as the core aggregate source in the industry. The production capacity stability and operational reliability of the construction waste stone production line directly affect the output quality and supply efficiency of manufactured sand and stone. The feeding process, as the first processing node of the waste stone production line, is responsible for uniformly and stably transporting raw materials to ensure the continuous operation of subsequent crushing and screening equipment. Different types of feeding equipment exhibit significant adaptability differences based on the characteristics of different raw materials and production scales. For raw stone materials with large particle size, high hardness, and high abrasiveness, traditional feeding equipment often has problems such as insufficient structural strength, easy blockage, and rapid wear, making it difficult to meet the continuous and stable production requirements of large-scale waste stone production lines. However, Heavy Duty Apron Feeder, with its own structural characteristics, has shown unique advantages in large-load raw material transportation scenarios and has gradually been widely used in the industry. This article analyzes its specific application in the construction waste stone production line.
Current development status of construction waste stone production lines
Sandy and stone aggregate production lines with an annual capacity of over one million tons generally use the same equipment, with the main equipment being vibrating feeders, jaw crushers, impact crushers, and circular vibrating screens, and auxiliary equipment including belt conveyors and dust removal system equipment. In the mining of waste stone, apron feeder mining has also gradually been applied, providing stable feeding support for the production line.
The general process of existing waste stone production lines is as follows: Large blocks of ore from the mine are uniformly sent into the jaw crusher by the vibrating feeder for coarse crushing. The fine-grained soil contained in the raw ore can be pre-screened by the vibrating feeder and transported away by a belt conveyor. The coarse crushed ore is then sent to the impact crusher for fine crushing, and the fine crushed ore is sent to the circular vibrating screen for screening. The crushed stones meeting the particle size requirements are transported by the finished product belt conveyor to the finished product pile; the crushed stones that do not meet the particle size requirements are returned by the belt conveyor and then crushed again by the impact crusher to form a closed circuit, improving resource utilization. For larger production lines, a buffer storage bin is usually added after the first stage of crushing.
Principle and application of Heavy Duty Apron Feeder
Working principle and structural characteristics
The Heavy Duty Apron Feeder operates through the rotation of an electric motor, which is driven by a coupling and a reducer to rotate the main shaft. The sprocket on the main shaft meshes with the chain to drive the chain plate to move, thereby achieving material transportation. The gap between the chain plates can remove fine particles from the raw materials. The reducer on the driving device often has an anti-reverse device (with an installation inclination greater than 15°), preventing reverse rotation during shutdown and allowing for speed adjustment through a frequency conversion device.
Application advantages in construction waste stone production lines
2.1 Strong bearing and transportation capacity can withstand the direct impact of tens of tons of raw materials unloaded by ore trucks and can transport materials with high density (up to 2400 kg/m³ or more), large particle size (over 1000 mm), strong abrasiveness, and a temperature below 400°C. Compared with vibrating feeders, due to its larger feeding particle size, it can reduce the workload of secondary crushing, save explosives, and lower production costs, and is economically and safely efficient; when the feeding capacity is the same, the motor power is only one level higher or basically the same, and the power consumption is not much. 2.2 Stable operation and good site adaptability The equipment is sturdy, durable, has a long service life, requires little maintenance, is convenient for starting and stopping, and operates stably and reliably. It is commonly used at the bottom of the raw material storage bin, capable of directly withstanding the huge pressure of the ore in the mine bin, allowing the raw material storage bin to be made larger to store more ore, ensuring uniform and stable feeding, guaranteeing the reliable operation of subsequent crushing work, protecting subsequent equipment, and avoiding sudden material breakage or overflow. In cement mines, it is often installed at an angle, with the maximum inclination angle reaching 25°, causing the weight of the material fed by the feeder to generate a component force along the length direction. The actual pressure it bears is much less than the weight of the material, reducing the load. A larger installation inclination angle can also prevent the ore in the bin from rolling down to the crusher during start-up and shutdown, improving the process configuration, reducing the height difference, enhancing the adaptability of the production line site selection, and avoiding the increase in transportation costs due to an excessively high raw material unloading platform. 2.3 Convenient operation and environmental protection and economy
The variable frequency speed control is adopted for operation, allowing the feeding volume to be adjusted, enabling heavy-load start-up, convenient start-up and shutdown, and mandatory discharge, significantly reducing the phenomenon of jamming. During operation, the vibration is small, the bearing temperature rises slowly, the sealing is easy, the dust removal system at the discharge location is arranged simply, the working sound is small, and it is safe and environmentally friendly. Although the equipment is heavy and large in size, the initial investment is large, but the operation is safe, stable and reliable, and the later operation and maintenance costs are low.
Importance in cement production scenarios
Heavy-duty apron feeder is an important equipment in the ore transportation system, commonly used at the bottom of the raw material storage bin, capable of continuously and uniformly feeding to the primary crusher, and can operate reliably in harsh environments such as open air and dampness. It has been widely used in crushing workshops of large beneficiation plants and cement enterprises. For cement production, the apron feeder in cement plants ensures the continuity and stability of production. The compressive strength of the limestone used in cement is medium to upper level, the extracted ore has various shapes, sharp edges, and lacks fluidity. The gaps in the storage bin are of different sizes, distributed unevenly, and the internal force is uneven. Needle-like and flake-shaped ores are prone to bridge and blockage, while the apron feeder can effectively address these problems, ensuring the smooth progress of cement production.
Conclusion
Based on the characteristics of construction waste stones and product requirements, the selection of the apron feeder mainly follows the guiding principles of energy conservation and consumption reduction, safety and environmental protection, reduction of product costs, and improvement of resource utilization.
In the early stage of the development of the cement industry, vibrating feeders occupied an important position in the crushing of limestone used in cement production. However, later, with the vigorous development of the cement industry and the continuous improvement of supporting equipment, vibrating feeders were eventually replaced by Heavy duty apron feeders.
