Heavy duty apron feeder is widely used in metallurgy, coal, cement and other industrial sectors, short transport equipment is more convenient, due to its long-term under the bad working condition, therefore has a certain requirements on the reliability of its design, which requires the designer in the heavy duty apron feeder design requires not only a strict calculation, also need to have appropriate experience of personnel for guidance.
Heavy duty apron feeder, in mining, metallurgy and so on need short weight of transport industry is widely used, mainly for the feeder were placed in a warehouse under the pressure of bin and hopper, big volume weight will be separated by bin conveying to the next level of crushing, screening, and transportation equipment, suitable for use is the primary crushing.The feeder can adapt to coarse materials and all kinds of fine materials, it has good adaptability, can work under all kinds of harsh working conditions, can run at full load for a long time, and for the change of the size of the material composition, temperature, viscosity, frost, rain and snow impact or ice material has a greater adaptability.The feeding quantity is uniform and reliable, and the feeder can be installed and run in the Angle range of 0~23°. Working principle of heavy apron feeder
Heavy duty apron feeder is the main power motor, through the motor is combined with coupling drive reducer drive sprocket shaft rotation, its means of transmission sprocket chain structure, sprocket chain institutions able to work under the bad working condition, its characteristic is low speed, can complete transport of heavy objects, through the chain to drag chain plate along the straight line, chain plate is installed on the frame of the roller and roller bearing, the chain need to set up corresponding tension device to ensure the chain and sprocket meshing correctly, to complete the purpose of conveying material.
Structural characteristics of heavy duty apron feeder
The heavy apron feeder is mainly composed of driving device, chain plate device, tensioning device, spindle device, frame, supporting wheel and sprocket wheel.The power partly by a motor, its internal USES is the rectangular axis protection floating, motor rotation drives the planet reducer output to the spindle, the fulcrum is floating, for shaft can reduce installation time for the accuracy requirement of the shaft, reduce the number of attached to the shaft bending moment, the shaft to be able to use a longer time, and easier to tear open outfit.
The chain plate device is composed of groove plate, chain joint, etc. The groove plate is of single circular arc or double circular arc lap joint type, which is welded by low-alloy steel plate.The whole material has high strength and is not easy to wear out.The section of the chain USES the same caterpillar structure as the construction machinery, which can ensure the reduction of errors and relatively smooth movement. Meanwhile, the strength of the chain section is high, and it can withstand a large load without lubrication.
The tensioning device is a kind of screw tensioning mechanism, which is mainly composed of shaft, two supporting wheels, rolling bearing, bearing seat, composite spring, and tensioning screw at both ends.The supporting wheel is connected with the shaft through the expansion and tightening mechanism, and the two ends are equipped with double row radial spherical roller bearings. The bearing seat is placed at both ends of the frame, which can slide on the slide rail. By adjusting the tension screw, the tension of the two chains can be even.The composite spring installed on the chain plate ensures that the chain plate can play a certain buffering role when it is impacted by the material to avoid the impact directly transferred to other parts of the feeder.
The spindle device is composed of shaft, bearing seat, sprocket wheel, supporting wheel, etc.The main shaft drives the driving wheel to drag the chain plate for continuous movement, so as to complete the purpose of feeding, the features of the device is that the sprocket and supporting wheel are connected with the expansion sleeve, the main shaft is set in the output shaft of the reducer, simple disassembly, maintenance and release.
The frame is an I-shaped structure welded by steel plates, which can ensure the stability of the mechanism. Design key points of heavy apron feeder
The original parameters required at design time are given by the user or process design.The main parameters to be paid attention to in the design are as follows: groove plate width, center distance of head and tail wheel, feeding capacity, material density, installation Angle and other parameters provided by the user.
Choose a reasonable driving device
Due to the heavy duty apron feeder need to drive the high load, feeder belongs to the constant torque device, on the assumption that the traction, certain torque is proportional to the radius of gyration, has nothing to do with the other parameters, and the size of the traction determines the traction, the make and model of the caterpillar track drive sprocket pitch subsequently determined, then the main shaft torque is constant, can be selected according to the above data reasonable drive mechanism.
(1) In the selection of the reducer, the reducer output torque should match the load torque, and the input speed should match the driving motor speed.
(2) When selecting the driving motor, it is necessary to make the operating base speed close to the frequency when the motor is in full speed, so that the motor can give full play to its capability.As heavy apron feeder is generally variable frequency speed regulation, and the equipment is a constant torque equipment, the use of the motor should also consider the surplus power and surplus output torque, if the output torque surplus, the frequency can be adjusted in the motor full speed frequency above;If the power surplus is large, the frequency can be reduced to use.No matter what the above situation, the selection should exceed the load practical power and practical torque.
Installation precautions for heavy apron feeder
Rack installation: frame generally installed in storage bin or under the funnel, on the basis of through embedded bolts connected to the frame, if it's not bolt connection, foundation should be embedded steel plate, the frame welding by using the method of welding on the embedded steel plate, such as high or low need to adjust, can use gaskets, but the gasket must be welded on the embedded steel plate, make it become one.When the driving device is safe, the motor reducer connected together shall be set on the main shaft, and it shall be locked by the locking plate. The bolts of the locking plate shall be tightened cross-over, and the force shall be evenly applied by the force distance hand. The tightening force distance of each bolt shall be 470N·M.Adjust tension device of screw, small position of bearing achieve tension device before hoisting chain plate bottom of the racks shall be either (before and after), with steel plate or channel steel pad, the height of the underlay and chain wheel is consistent, then at the other end of the crane lifting, hanging at the end of chain plate wire rope and the chain plate slide from one end to the other end.When moving to a certain distance to the other end of the chain plate connected to the caterpillar chain is articulated with the rest of the day, is through the pin shaft coupling, different is articulated pin and the link between fit tolerance from its loose some of her day, hammer knock can be articulated pin load link in articulated installation place tags shall be maintained to facilitate future maintenance and dismantling.After installing the second broken chain plate, take the above method to continue to lift the chain. When the length of exposed chain plate at both ends is basically the same, the other end of the chain plate can also be hung with steel rigid wire rope to lift the wire rope at the same time, so that the distance between the two joints can be gradually reduced until the live joint pin can be put on.
Adjust apron feeder the screw of the tensioning device and the tensioning chain plate so that the tension is moderate and the return segment chain plate is naturally transitional.Further check whether all parts are properly installed, whether the connection bolts are securely fastened and reliable, whether lubricating oil has been injected in each lubricating part and reducer casing, whether the wiring of motor and electrical apparatus is correct, whether there are forgotten tools and other components affecting the operation in each corner of the machine.After checking that everything is normal, the machine can be operated with no less than 2 small space and time loads.