Company to carry out instructions for injection molding machine mechanical CE certification requirements and recommendations
Mechanical hazards like from the following four main components:
● normal processing machinery, such as processing easy for a rebound and hurt the staff, the design and manufacture of processing machinery should be able to rebound against the workpiece, so as not to cause harm;
● If the processing machinery to stop functioning after the contact with the tool, there are still dangerous, processing machinery with automatic stop device must be to ensure that the tool in a very short period of time is stopped;
● If the processing machine with a tool is not fully automated equipment, the design and manufacture should prevent the occurrence of injuries; or circular cross-section of the cutting tool and limit its thickness, will be kept to a minimum of harm.
● mechanical hazards: The main components from the movement, including movement of the shaft and the drive mechanism caused by compression, shear, or twist into such danger. Recommend the use of fixed or movable guard to prevent people approaching the danger zone, injection molding machine should consider several points:
1 component requirements. And security-related control circuit in the design, selection and assembly of components to use mature technology, that similar applications have been widely and successfully used, or manufactured according to safety standards and reliable components, and the use of mature technology. Safety control circuit to be able to withstand the expected operating strength to withstand the process of working medium run impact and relevance of the external environment: in the design of the circuit, the work should be extremely safe and reliable components, such components can not consider itself failure may occur. Meanwhile, in order to avoid short circuit, reduce the incidence of failure to determine the type of fault, to accurately detect failures and to avoid the occurrence of secondary failure, can be used such as: isolation circuit, the full carrying capacity, when the case of power failure in time open, a good grounding and other measures.
2 stop machine safety requirements. Machinery and equipment security, the core is to make the equipment dangerous actions stop, how to stop the equipment from running down it is very important. Depending on the different security devices, can have different safety stop function. In normal operation the stop feature, you must be able to avoid equipment, products and processes to be destroyed, while machinery and equipment to be able to prevent the re-start, which is required for the safety stop function.
EN 60204-1 standard in the first paragraph in 9.2.2, provides for three stop categories:
Stop category 0: the supply of machinery and equipment by immediately cutting off the power to achieve the end, that is, to stop out of control.
Stop 1: a controlled stop, the supply of machinery and equipment remain the executing agency the power to make the equipment gradually stopped. Only when the equipment was only completely stopped the power cut off.
Stop category 2: a controlled stop, the supply of power to drive machinery and equipment has been maintained.
The right to stop category selection, must be based on machinery and equipment carried on the basis of risk analysis, which are stipulated in EN ISO 13849-1standard.
All equipment must have a category 0 stop function to stop. Stop 1 and 2 stop function only in the machinery and equipment safety and functional requirements can be used when necessary.
3-hand control device is used. In many high risk of machinery and equipment, such as forging equipment, punching equipment, will use the hand control device. Hand control device is power-sensitive safety device, its role is when someone in the operating equipment, machinery and equipment to dangerous operation of a signal, forcing them to use both hands, which must stay in one place, so you can ensure safety.
4. Safe distance from the solution.
A. Safety door switch can lock, power-sensitive safety devices, safety mats and hand controllers to achieve.
B. In the safety protection equipment in addition to safe and reliable protection components, but very dangerous for the equipment, but also its security control circuit to make certain requirements in order to improve the level of security protection, such as: safety monitoring module.
5 the use of safety mats. Security protection in machinery and equipment, some places can not use the security fence and security doors to protect the safety of hazardous areas, such as in a number of large-scale injection molding machinery, metallurgical machinery, often need to be maintained within the machine and adjust, then need to ensure that the external can not start the machine, in which case obviously can not use the security gate. In addition, some need and can use the security gate where, for convenience and aesthetic considerations, but also may be reluctant to adopt security gate. In both cases, in order to realize the danger zone of security, you can use the contact safety protection device. In this type of security devices, security is a very unique carpet, is also widely used one.