Compared with traditional machine tools, CNC machine tools have added numerical control systems and corresponding monitoring devices. A large number of electrical, hydraulic and electromechanical devices have been applied, resulting in an increased probability of failure; industrial grid voltage fluctuations and disturbances are reliable for CNC machine tools. The nature is extremely unfavorable. Due to the complicated structure and high price of the manufacturing system, the “downtime loss†caused by various failures has become a burden in the production of the enterprise. In this regard, the Schmersal Group has introduced a number of products, such as compact electromagnetic interlocks for small safety guards, three-point interlocks for very large safety guards, and for protecting hazardous areas that require walking. Modular system. At the same time, because most of the machine tool manufacturers are international companies, and their customers are distributed globally, such as emerging economies in East and South America, Schmersal can quickly provide corresponding services and consulting in about 50 countries.
A professional explosion-proof communication group headquartered in the United States can produce a variety of products including explosion-proof monitoring, explosion-proof communication, fire protection and sound and light alarm products. After years of development, many equipment on the production line, such as CNC machine tools, can be called For the "antique grade" equipment, after years of operation, the equipment is already in overload operation. At present, the door locks and limit positions on the lathe have been invalidated, the emergency stop device is aging and the position is not accurate, although the equipment can still operate normally, but there is There are many hidden dangers. How to transform these equipments to improve the safety level of the equipment without affecting the production efficiency is a difficult problem facing the enterprise.
As a company focused on safety, Schmersal Group has professional safety standards and rich experience in security services. The company uses structured security methods, from pre-risk assessment to medium-term security design to final system transformation. Messi provides the company with a complete turnkey security consulting service to help customers reduce equipment risk and achieve the required PL level to comply with mechanical safety regulations.
Schmersal has added a series of safety input products such as safety door lock AZM161, limit switch Z/T235, emergency stop button EDRRZ, safety edge SCE, safety carpet SMS-4 and foot switch Z/TFH232 to the customer's equipment. When personnel are in contact with hazardous areas, the equipment can be stopped normally to ensure safety. For example, when performing special operations such as tool setting, it is necessary to shield some safety measures such as safety door locks. At this time, use the enable switch ZSD5 to ensure safety, and install a three-color lamp. During this operation, the indicator light flashes.
All of the customer's safety input products are connected to Schmersal's latest safety PLC controller PSC1-C-100. This safety PLC input/output channel adopts dual-channel redundant structure and is certified by TüV safety, in accordance with ISO13849- 1, the performance level can reach PLe. In the output part, the double contactor is connected in series, and the normally closed contact of the contactor is used as a feedback signal to be connected to the safety PLC to monitor the output state and ensure that the power can be cut off. Set two-stage power control. When the safety door of the machine is opened, the moving parts of the equipment are disconnected. When an emergency occurs, the power supply of the equipment is cut off by pressing the emergency stop button.
Through the above security transformation, and calculate the four parameters of the PL, Category, MTTFd, DCavg and CCF, each safety chain of the equipment can achieve the required performance level (PL). Through the upgrade and modification of the CNC safety system, the customer's equipment operation and personnel safety protection have been improved, and the production loss has been reduced, effectively reducing the safety operation risk of the enterprise.
Improving the safety performance of CNC machine tools is the overall trend of the industry development, and it is also the responsibility and obligation of a qualified company. Through the safety transformation of equipment, the Schmersal Group has effectively improved the safety level of equipment and fundamentally created a truly safe production environment for employees.
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