The safety door switch is installed at the entrance and exit of dangerous sources such as safety barrier gates. Usually, it includes mechanical locking type and contactless type.
The mechanical locking type of the ESPE safety door switch is further divided into mechanical locking type (mechanical lock, power to release) and electromagnetic locking type (power to lock, mechanical release).
The mechanical locking type of the ESPE safety door switch (mechanical lock, power to release) still maintains the locking state even when the power is cut off, which is suitable for protecting personal safety in dangerous sources with inertia such as rolling mills. In addition, it can also maintain the locking state during a power outage, so it can also ensure safety when the device is started after power-on. Therefore, before ensuring the safety of processing machines, the operator cannot enter.
While the electromagnetic locking type (power to lock, mechanical release) releases the locking when the power is cut off, so it is suitable for protecting personal safety and the manufacturing process in dangerous sources that cannot move due to inertia after the power is cut off.
The ESPE non-contact safety door switch detects the opening and closing of the door, and immediately stops supplying power to the dangerous source once the door is opened. Since there is no locking device, no frictional powder is generated. Therefore, it is suitable for equipment that requires a dust-free manufacturing environment, etc. At the same time, there are fewer surface irregularities, and it is difficult to attach and accumulate extraneous substance on the switch body or the matcher part, so it is also suitable for food production devices, etc.
The operation principle of safety door switch
The ESPE safety door switch consists of two independent parts: the switch body and the operation key.
When the safety protection door is opened, the operation key is pulled out from the switch body, and at this time, the normally closed/open contacts in the switch will be disconnected through a mechanical rebound device.
When the safety protection door is closed, the operation key is inserted into the switch body, and at this time, the normally closed/open contacts are closed, so that the drive or control system of the machinery and equipment can be energized to work.
Under any circumstances, a safety door switch with a separately detachable operation key is not allowed to be used as a mechanical stop switch
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