The pneumatic hoist has multiple safety protection designs to ensure safe operation. 

The following are some common safety protection devices for pneumatic hoists:

Limiter: used to limit the lifting height and walking distance of the hoist, to avoid accidents caused by exceeding the set range.

Height limiters generally use sensors such as travel switches or photoelectric switches to detect travel. 

When the lifting height reaches the set value, the limiters will automatically stop the movement of the lifting mechanism and alert the operator by issuing an audible and visual alarm. 

Travel limiters generally use sensors such as travel switches or encoders to measure travel. 

When the travel distance reaches the set value, the limiters will automatically stop the movement of the travel mechanism and alert the operator by issuing an audible and visual alarm.

Heavy load protection device: used to monitor the weight of the lifting object, issue an alarm in a timely manner and stop the lifting movement when overloaded, to avoid accidents caused by overloading. 

Heavy load protection devices generally use devices such as weighing sensors or pressure sensors to determine whether the lifting mechanism is overloaded by measuring its load-bearing capacity. 

When the weight of the lifting object exceeds the set rated load, the overload protection device will automatically stop the movement of the lifting mechanism and remind the operator through an audible and visual alarm.

Windproof device: When the wind is strong, ensure that the gourd will not be blown down or unstable by the wind.

Lightning arrester: used to protect the safe operation of hoist cranes under harsh weather conditions such as lightning strikes.

Operation guardrail: Set up guardrails around the operation area of the hoist to prevent workers from accidentally entering the operation area or injuring people by lifting objects.

In addition, there are other additional safety protection measures, such as gas cut-off protection devices, overload protection devices, etc. 

When using pneumatic hoists, it is also necessary to pay attention to following the operating procedures and safety instructions to ensure the safety of operators and the normal operation of the equipment.