Analysis of rectifying deviation technology of vacuum belt dryer

The material belt correction system of vacuum belt dryer has been a problem that most domestic manufacturers have not solved up to now, which is also a problem that users complain about more Zui Some domestic manufacturers, due to the lack of technical strength, often just blindly imitate rather than devote themselves to the development, thinking that copying the configuration of imported equipment can achieve the goal, but in fact, it is not so easy In essence, due to its limited manufacturing capacity, foreign products have their own guarantees in terms of materials, machining, heat treatment technology, manufacturing accuracy, etc., and the rigor of the installation procedure is temporarily beyond our reach, so the same configuration can give full play to its role As for domestic equipment, we should first clearly recognize the existence of this gap, and then use the existing conditions to achieve technological breakthroughs through independent development to achieve the same purpose 1) At present, there are two types of belt correction: mechanical forced correction of guide strip and full-automatic online correction, both of which need to be selected according to the drying characteristics of materials and the material of conveyor belt It seems that the mechanical force correction method of guide bar is relatively simple, but it is not easy to ensure a reasonable design As for the automatic online correction, the technical difficulty is even higher There are many factors to be considered in the design of the deviation correction system, first of all, the adjustment of the tension of the material belt (the main deviation correction system), which is the main component of the deviation correction system Because it is closely related to the transmission system, the selection of the cylinder, the use of the coupling, the distribution of compressed air, the manufacturing accuracy of the linkage and the configuration of various bearings are all considered in the design We must be careful In the design of the deviation correction system, the selection of sensors is very important In the domestic vacuum belt dryer, the configuration of this accessory basically adopts two kinds of imported optical fiber sensors or magnetic displacement digital sensors, both of which have their own characteristics The former is relatively simple, but the accuracy of the deviation correction parameters is poor, and it is easy to be affected by the evaporation conditions during the field drying The latter has high precision It uses permanent magnetic ring to continuously detect the accumulated displacement information of 1 / 2000 point in the range of ± 1cm, and it is not affected by the environment of vacuum, temperature difference and changeable dry and wet conditions It can quickly reflect the accurate and stable belt displacement value for a long time, which provides a reliable guarantee for the implementation of the deviation correction system, but the price is expensive, and it should be installed with great care Otherwise, it is easy to damage 2) There is another auxiliary deviation correction device in the deviation correction system that must be considered Most manufacturers in China have not paid enough attention to this device They always think that the main deviation correction system mentioned above can achieve the goal, and the final result of Zui can be imagined and known The auxiliary correction includes two parts: tracking detection and buffer correction The function of tracking detection is to effectively control the material belt in the operation process, and to provide a controllable range for the information collection of sensors in the main correction system, especially for the dryer with mechanical forced correction of guide strip The intermediate transition and tracking adjustment are very important Buffer rectification is a kind of balance adjustment of the friction between the transmission shaft and the material belt after the completion of the main rectification, which can help the quick reset after each rectification and the Zui large effective contact surface between the material belt and the transmission shaft 3) The machining and assembly accuracy of the parts in the deviation correction system are very high, especially the mobile parts need to be precisely processed in strict accordance with the machining standards During the assembly process, the corresponding tooling and fixture need to be configured to avoid the use of welding and other process means without accuracy assurance Therefore, the manufacturers are equipped with professional engineering and technical personnel team in this field But now some manufacturers, due to the limited ability of machining and fixture design, put all the hope of rectifying deviation on automatic control, thinking that the mechanical accuracy can not be compensated by automatic control In fact, this is the idea of putting the cart before the horse completely with the concept of mechanical products, because automatic control is only a system for mechanical action, if a set of moving mechanical device is not high Precision parts as the basic guarantee, even the most advanced automatic control system is useless.