Pneumatic elevator overload protection device and pneumatic elevator

The utility model relates to a pneumatic elevator overload protection device and pneumatic elevator, this overload protection device include the board of weighing, the gassing board, and the bolt, nut and spring, the one end of bolt with the said board fixed connection that weighs, and pass in proper order said gassing board and spring, the other end with said nut closes soon, be equipped with a plurality of gas leakage holes on the gassing board, gas leakage the hole the position with the said board of weighing corresponds. The utility model discloses use the principle that there are the draught head in interior airtight space of well and external atmospheric pressure, the combined effect with spring force realizes opening and closing of overload protection device through the gas pressure difference, and when overload protection device opened, airtight space fed through with external atmospheric pressure, has prevented the motion of car under the gas pressure difference acts on, makes elevator lift system lose the ability that promotes the car, and fail safe nature is higher