With the country's more and more strict environmental protection inspection, many places have introduced new policies: limiting the development of small mines and encouraging the construction of large mines. The reserve scale of new building stone mines must reach more than 10 million tons, the annual mining scale must reach more than 1 million tons, and encourage new mines with reserves of more than 100 million tons and annual mining scale of more than 10 million tons in the planned mining areas around large and medium-sized cities. This has led to the need to vigorously develop super-large apron feeder, which has emerged as The Times require the production of dual-drive apron feeder.
The development of society, environmental protection efforts are also constantly required to upgrade, many small sand and gravel plants have been shut down! How to comply with the requirements of social development, and can reap rich benefits? That is to build a large environmentally friendly sand aggregate production line! This can meet the requirements of environmental protection, while ensuring the material base needed for social development. Aggregate production line four systems
1. Feeding system
The role of apron feeder in the sand aggregate production line is to feed raw materials to each section of the crusher, according to the crushing and screening process, the equipment to complete the feeding link is vibration feeder or apron feeder. In the large aggregate production line, the heavy duty apron feeder is generally used to supply the stone.
2. Conveying system
Belt conveyor in the sand aggregate production line system is to each section of the vibrating screening equipment output raw materials, according to the screening process, complete the conveyor link, the general use of conveyor belt conveyor or plate conveyor. However, in the sand aggregate production line, under normal circumstances, belt conveyors are used, which have long service life, low cost and large throughput.
3. Crushing system
The crushing system is the heart of the whole thing. Its work is to break all kinds of ore raw materials into finished materials of the required size, and a combined sand production line can be composed of multiple crushers. These crushing mechanical properties are different, together to complete the crushing work of stone.
4. Screening system
The screening system is to sift the crushed ore through the screening machine. In the sand and stone production line, the sand and stone need to be separated, and the graded sand and stone need to be transported to the respective site by belt conveyor. The equipment used in this process is generally a round vibrating screen or a linear vibrating screen and other screening equipment.
As the first process of the four major systems, the equipment selection of the feeding system directly affects the work efficiency of the whole production line. For large sand aggregate production line, the crusher in the system has a large production capacity, usually reaching thousands of tons per hour, so it is necessary to choose the appropriate apron feeder to feed it, because the delivery output reaches more than 2000 tons. If you choose a single drive apron feeder, the motor power is difficult to select, usually choose a double drive heavy duty apron feeder.

Dual driver apron feeder structure
1. Drive device:
It is composed of 2 motors, 2 planetary reducers, 2 torque arms, 2 torque rods and 2 sets of locking discs.
2. Spindle device:
It is composed of shaft, bearing seat, sprocket, supporting wheel and expansion sleeve.
3, tension device:
It is a screw rod tensioning mechanism, the main function is to tighten the chain plate device. It is composed of shaft, support wheel, expansion sleeve, sliding bearing seat, composite spring, pull rod and other parts.
4, frame and plate:
The frame is a welded structural part, which is welded and bolted by I-beams, channel steel and steel plates. The bar plate and funnel are plate welded structures, which are composed of hopper, support, chain curtain and rubber curtain. In the bar plate and funnel, the lower part of the hopper is connected with the crusher entrance, and the rear bar plate is connected with the silo for storing and guiding materials. The chain curtain consists of a chain on the shaft, which is used to prevent the broken material from flying outside.
5, chain plate device:
apron feeder chain plate device is composed of chain rail (chain), chain plate and bolt. The chain plate is manganese steel stamped welding parts and the chain rail is the standard track chain for bulldozer. The chain plate and the chain rail are supported by the supporting wheel, and the return no-load chain plate is supported by the supporting chain wheel.
Three: Double drive apron feeder inverter selection
Use a frequency converter to drive two motors, one production capacity of 2500t/hapron feeder, need two 90kW motor drive. Frequency converter selection should be slightly higher than the motor capacity, leaving a certain margin, especially when a frequency converter drags two motors to run, usually a motor starts first, and the second motor adds to start, then the additional motor will produce a large starting current, and the short-time overload capacity of the frequency converter should be 150%. Therefore, the choice of frequency converter is actually the process of optimizing cooperation with the motor. apron feeder is a constant torque load, the rated current of the inverter must be greater than the rated current of the motor, the inverter can be used in the -10℃ ~ +45℃ environment, without capacity reduction, the whole system of the frequency conversion device is tested before leaving the factory to ensure the reliability of the whole system. According to the requirements of on-site apron feeder control, on the premise that it can meet the production, priority is given to select a universal inverter.