Under the action of alternating stress, although the stress value of the mine vibrating screen is lower than the yield limit, the structure will suddenly break with the increase of working time. This is the fatigue damage, so the strength check of the structure subjected to the alternating load is performed. The fatigue limit should be used. Large-scale mining vibrating screens are difficult to analyze according to elastic continuum, and the amount of calculation is large. After dividing into sub-structures, state space method can be used for analysis, which is convenient for analyzing the dynamic relationship and energy transfer relationship between sub-structures, which is helpful for studying vibration energy pairs. The influence of structural strength provides a basis for structural improvement.
Mine vibrating screen boxes are generally composed of side plates, beams, spring supports and other components. These parts are fixed together by some commonly used fasteners such as threaded joints, riveting, welding, etc. The whole result is divided into sub-structures according to the components, which is simple and intuitive, and conforms to people's general ideas. Moreover, it can be seen from the analysis results of transient dynamics that the joint between the beam and the side plate and the joint between the spring bracket and the side plate are also relatively stressful. It is prone to damage.
In addition, since the side plate of the mining vibrating screen is a large piece of thin plate, if the design rigidity or the actual rigidity is insufficient, in the working process of the screen box (at the moment of vibration), large deformation is inevitable, so it is necessary to It conducts research. Therefore, in the process of sub-structure division, the side plates can be further subdivided into smaller sub-structures according to the deformation situation, such as a rigid body where the deformation is small, and a sub-structure with concentrated elastic components and concentrated mass is simplified in the place with large deformation. For further study.
The concept of the introduction of power flow into the mine vibrating screen was originally intended to describe the vibration isolation effect of the vibration isolation system more effectively and completely. It is based on the description of energy transfer, so the power flow can also be used to study the vibration strength of the structure. Obviously, if the input power flow of a substructure of a system is larger, the substructure is more likely to be destroyed, so the power flow can be used as a comprehensive index to measure the strength and transmission characteristics of the vibration.
The power flow is a scalar and the power flow may be positive or negative due to the different locations selected on the mine vibrating screen. When the power flow is negative, it means that the energy delivered to it during this period of time is negative, which plays the role of absorbing energy and dampening energy.
During the operation of the mine vibrating screen, the spring bracket is in direct contact with the spring and bears a large load. The main load includes the supporting force of the spring and the force and moment of the side plate. According to the time history analysis of the mine vibrating screen in the early stage, the stress at the spring bracket is large. If the spring bracket breaks, tears, etc., the mine vibrating screen will not continue to work normally, so it is a key component. It is necessary to analyze its energy distribution and transmission. The power flow is calculated below. Http://
Temperature factors have a vital impact on the performance, life and safety of power batteries. Generally speaking, we expect the battery system to operate in the range of 15-35 C, so as to achieve the best power output and input, the maximum available energy, and the longest cycle life (although cryogenic storage can prolong the calendar life of the battery, but the application of cryogenic storage is not significant, which is very similar to human beings). The refrigeration effect of fluorinated refrigerant is excellent, which can effectively reduce temperature and prevent explosion.
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