A Design And Implementation Of Function Safe Dust Explosion Proof For Robot Grinding

In recent years,robot instead of manual grinding technology has been widely used in various fields due to its high efficiency and high precision.After robot grinding is implemented,the dust generated during grinding is collected in real time by the dust collection pipe.Compared with that,when using manual grinding,the dust is handled by ventilation and dust collection in the area,so it is generally considered that the new technology is safer in dust explosion-proof.However,considering the high efficiency of robot grinding,long working hours,full automation,the introduction of electrical control equipment and so on will also increase the risk of dust accidents,whether the overall risk of dust in the new technology is increased,and whether the measures taken are sufficient to suppress the risk,the protective measures that are taken only according to the explosionproof standards cannot be judged.In order to solve this problem,this thesis introduces the functional safety standard,which transforms the dust explosion-proof design from the traditional standard design to the design of the safety function and safety related system.On the one hand,by determining the risk range and using the risk analysis method to calculate the risk,the dust risk in the grinding process can get the specific quantitative value.On the other hand,when judging the risk is too high,by designing additional safety related systems and using safety integrity assessment method for calculation and verification,we can ensure that the residual dust risk after taking measures can be reduced to a lower range of visible values,so as to ensure that the risk is indeed suppressed.This design is based on the actual project,divided into theoretical design and implementation design and operation debugging.In the theoretical design,based on the functional safety standards,this thesis takes the overall safety life cycle as the technical framework,and uses the risk chart and simple quantitative method to determine the risk range and quantify the risk.After getting the conclusion that the risk is too high,the safety related system is designed according to the hardware fault margin relation table of the system architecture,and then the safety evaluation method of reliability framework chart is used to verify the safety performance of the system,which proves the feasibility of the design.In terms of implementation design,this thesis is divided into three parts: electrical design,control system design and application interface design.In the electrical design part,the electrical schematic diagram of the system is drawn to build the physical connection of the system;in the control system design part,the PLC system configuration and programming are carried out to establish the basic logic of the safety mechanism;in the application interface design part,the computer software programming is carried out to provide the display interface of safety parameters and alarms.In the operation and debugging,the whole debugging is divided into several single debugging by the way of module decoupling.By increasing the preparation time of decoupling work in the early stage,the difficulty of later debugging is greatly reduced.