Analysis and optimization of screw conveyor

一. Screw conveyor common faults:
1 screw shaft stop
To stop the rotation of the screw shaft main reason may have the following 3 situations: ① the material was too much, resulting in greater resistance through the middle of the bearing, increase the load of the motor end stop; ②may be due to the damaged seal at intermediate bearing, due to excessive resistance, damage to the bearing material into the bearing after. ③It may be due to the large size of the material in the transportation process, the resistance between the material and the tank is increased, the motor load is increased, and the automatic protection of the motor thermal relay is started.
2 reducer bearing abnormal
After the drive, the reducer bearing abnormal heating up, accompanied by abnormal noise, and the motor and reducer are also abnormal vibration. May be the following reasons leading to the problems: (1) the input shaft of the speed reducer in normal position, but the position of the output shaft bearing temperature is too high, this is because the screw shaft center line may be right, or bearing reducer output shaft position was burned, possibly because both ends of the bearing seat is fixed is not solid, loose. (2) it is also possible to output the bearings with normal temperature, but the input shaft temperature increases, mainly because the motor fixed bolts appear loose, or the output bearings of the reducer are burned out. (3) the temperature of the output bearing and the input bearing of the reducer increase at the same time, mainly because the bearings on both ends of the reducer are damaged simultaneously, or the fixed bolts of the reducer are loosened.

二. Optimization of screw conveyor
1. to improve the connection strength of bolt
The main factors affecting the strength of bolt connection include the load distribution of the screw thread, the range of stress variation, the mechanical properties of the material, the degree of stress concentration and the additional stress. Through a lot of practice, theory can prove that the bolt connection under axial load, based on the minimum stress conditions, link reliability and stress amplitude are closely related, the stress amplitude is smaller, the possibility of bolt fatigue damage is smaller, so as to improve the link reliability. As the bolt is connected, the total tension is transmitted through the contact of the threaded tooth surface. Because of the rigidity of the bolt and nut, and the deformation property is different, the force on the ring thread tooth is also different. When the connection is subjected to load, the bolt will be stretched and the pitch of the external thread will be increased. The compression of the corresponding nut will reduce the pitch of the internal thread. Therefore, choose the proper number of turns of the nut.
2. The part quality improvement and strength
In the screw conveyor structure, there are strict requirements on the spacing and orientation of spiral blade angle, if the spacing between adjacent blades, orientation angle error equipment during operation will appear to increase swing amplitude and the amplitude of the vibration phenomenon, which affects the reliability and safety of the blade. In addition, the screw conveyor in the course of running usually more materials, longer running time, so the damage to the spiral blade is relatively large, resulting in distortions, deformation, wear and other issues. In view of this situation, to start from the source, improve the quality of the helical blade, and strictly control the size of the error between the leaves, improve the compactness and reliability of weld; prevent problems of slag or pores; in addition, to further ensure the spiral shaft and the transmission shaft strength.
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