About Mechanical CE certification , Xingyuan certification testing organization to provide you with CE certification directive for machinery recommendations and requirements
General mechanical hazards mainly come from the following four parts:
1, the normal use of processing machinery, if the workpiece is easy to rebound and hurt the staff, the design and manufacture of processing machinery should be able to prevent the rebound of the workpiece, so as not to cause harm;
2, if the processing machine stops running, the contact with the tool is still dangerous, the processing machine must be equipped with an automatic stop device to ensure that the tool is stopped in a very short time;
3, if the processing machinery with a tool is not fully automated equipment, its design and manufacturing should prevent the occurrence of injury incidents; Or use a tool with a circular section and limit its cutting thickness to keep the harm to a minimum.
4, mechanical danger: mainly from the motion components, including the movement shaft and transmission mechanism caused by extrusion, shearing or twisting and other dangers. Fixed or mobile shields are recommended to prevent people from approaching hazardous areas,
A few suggestions to consider when designing a sewing machine head:
1. The rebound caused by the fracture of the needle in the process of use will hurt artificial personnel, and even bounce to the eyes, etc., which can be achieved by adding a shield or a needle protector.
2, the tip of the needle will also require finger protection.
3, belt and other places to increase the protective cover.
Injection molding machine should consider several points:
1, component requirements: The control circuit related to safety functions must use technically mature components in the design, selection and assembly process, that is, have been widely and successfully used in similar application fields, or components manufactured according to reliable safety standards, and the use of mature technology. The safety control circuit should be able to withstand the expected operating intensity, and be able to withstand the influence of the working medium during operation and the influence of the relevant external environment. When designing the circuit, components that are extremely safe and reliable should be used, and the possibility of failure of such components themselves can be ignored. At the same time, in order to avoid short circuit, reduce the incidence of failure, determine the type of failure, accurately detect the fault and avoid the occurrence of secondary faults, measures such as: isolation circuit, sufficient carrying capacity, timely open and power off when the fault occurs, good grounding and so on can be used.
2, machine safety stop requirements: the core of the safety protection of machinery and equipment is to stop the dangerous action of the machine and equipment, how to stop the machine and equipment from running to stopping is very important. Depending on the safety protection device used, there can be different safety stop functions. The stop function used in normal operation must be able to avoid the destruction of the machine equipment, products and processing, and at the same time to prevent the restart of the machine equipment, which is the requirement for the safe stop function.
In paragraph 9.2.2 of the EN60204-1 standard, three categories of stops are specified:
- Stop Category 0: Stop by immediately cutting off the power supply to the machine equipment, that is, stop being uncontrolled.
- Stop Category 1: controlled stop, the power supply to the actuator of the machine equipment is maintained, so that the machine equipment gradually stops. The power supply is cut off only when the machine has stopped completely.
- Stop Category 2: Controlled stop, the power supply to the machine equipment drive device is maintained.
1, the choice of the correct type of stop must be based on the risk analysis of the machine and equipment, which is stipulated in prEN954-1:1994 standard.
2, all machines and equipment must have the stop function of stop category 0. The stop function of categories 1 and/or 2 May only be used if necessary for the safety and functional requirements of the machine.
3, the use of two-handed control devices: in many high-risk machinery and equipment, such as forging equipment, punching and cutting equipment, will use two-handed control devices. The two-hand control device belongs to the electrosensitive safety protection device, and its role is to force the use of both hands at the same time when someone is operating the machine and equipment, giving the machine and equipment a signal that generates dangerous actions, so that it must stay in one place, which can ensure safety.
4, safety distance solution: A can use safety door switch lock, electric sensitive safety protection device, safety carpet and two-hand controller to achieve B in the safety protection of machinery and equipment, in addition to the use of safe and reliable protection components, for very dangerous machinery and equipment, but also to make certain requirements on its safety protection control circuit to improve the level of safety protection, such as: Safety Monitor Module
5, the use of safety carpet: in the safety protection of machinery and equipment, some occasions are unable to use safety fences and safety protective doors to protect the dangerous area, such as in some large injection molding machinery, often need to go to the machine for maintenance and adjustment, at this time need to ensure that the external can not start the machine, in this case obviously can not use safety protective doors. In addition, in some cases where safety protective doors are needed and can be used, for convenience and aesthetic considerations, there may be reluctance to use safety protective doors. In both cases, in order to achieve the safety protection of dangerous areas, contact safety protection devices can be used. In this kind of safety protection device, safety carpet is very characteristic and is also a very widely used one.
