We designed a safe and reliableLifting height limiter

The device combines the travel switch with the convex and concave brace structure, which is simple in structure and sensitive in action. It effectively suppresses the occurrence of major personal casualty accidents and ensures the safe production of the construction site. After several years of use, the effect is remarkable.

(1) structural form and installation

The travel switch is fixed in the semi closed protective box made of thin steel plate with bolts. Two slide seats are welded at the bottom of the protection box, and the convex and concave brace can move left and right along the slide in the slide seat. A small hole is drilled at one end of the convex and concave brace to fix the thin steel wire rope or nylon rope. Thin steel wire rope and veneron rope are used to set the limit height.

Lifting height limiterIt can be installed beside the winch or in the distribution cabinet. During installation, the thin steel wire rope or nylon rope shall be inserted into the small hole at one end of the convex and concave brace and fixed firmly, and the other end shall be fixed on the top of the lifting cage. The travel switch lead is connected to the AC contactor of the distribution cabinet.

(2) working principle

When the cage of the construction elevator runs upward, the small roller on the travel switch is at the concave point of the convex and concave brace - the energized position. In case of mechanical failure or operator's misoperation of the lift, the lifting cage will rise to the limit height, i.eLifting height limiterAt the set height, because the cross beam of the lifting cage drives the thin steel wire rope and the convex and concave pull rod, at the same time, the small roller on the travel switch moves up to the convex of the convex and concave pull rod due to the external force, and the small roller moves from the opening point to the convex point, so that the travel switch is powered off, the upstream power supply is cut off, the winch motor stops running, and the lifting cage stops running. ManualLifting height limiterThe convex and concave pull bar of the travel switch can reset the small roller on the travel switch from the convex point to the power on position of the concave point, and then the lifting cage can be started.

The device complies with the requirements of safety rules for construction lifts. When the lifting cage runs beyond the set height, the device can quickly cut off the main power supply and stop the lifting cage. It is emphasized in the specification that the automatic reset type is not allowed for SS type elevators for both people and goods, and the safety device is non automatic reset type. Cut off the main power supply during the action, and reset manually after the action to restore the power on state, so that the elevator can operate normally and effectively prevent the occurrence of "roof falling".

(3) conclusion

ThisLifting height limiterThe structure is novel and simple, and the automatic control is safe and reliable. It can only be pulled once to prevent accidents, and can effectively control the occurrence of "roof falling" accidents. Moreover, the manufacturing cost is low and it is worth popularizing and using. The device is suitable for various vertical transportation equipment such as construction elevators, gantry frames and construction derricks.