The invention discloses a centrifugal force emergency braking device for a chain hoist, which consists of a rotatable shaft supported on a mounting plate, a limiting wheel circumferentially connected to the rotatable shaft, a braking ratchet wheel, a braking and limiting pawl movably mounted on the mounting plate, a disc spring and an axial limiting piece, the limiting wheel is provided with a limiting groove and a hollow reducing shaft head extending in the axial direction, the shaft head is sleeved with a center step through hole of the brake ratchet wheel, a limiting protruding head arranged on the brake ratchet wheel extends into the limiting groove, the disc spring and the axial limiting piece are sequentially located in the center step through hole, the disc spring abuts against a step of the center step through hole, and the axial limiting piece is connected to the shaft head in a clamped mode. When the situations that a hoisted object falls accidentally and an existing friction transmission gravity braking assembly fails occur in the hoisting process, the rotatable shaft rotates reversely at a high speed instantly, so that the braking ratchet wheel generates overlarge centrifugal force, and the braking ratchet wheel is engaged and locked by the braking limiting pawl; by means of the device, risks and hidden dangers caused by existing brake failure are effectively avoided.
本发明公开了一种手动葫芦用离心力紧急制动装置,它是由支承在安装板的可转动轴、周向联接在可转动轴的限位轮、制动棘轮、活动安装在安装板的制动限位棘爪、碟簧和轴向限位件组成,限位轮开设有限位槽以及轴向延伸有中空缩径的轴头,制动棘轮的中心台阶通孔套设轴头,制动棘轮设有的限位凸头伸进限位槽中,碟簧、轴向限位件依次位于中心台阶通孔内,碟簧抵触于中心台阶通孔的台阶,轴向限位件卡接于轴头。本发明吊升过程却意外出现吊物下坠并叠加现有的摩擦传动重力制动组件失效的情形同时发生时,可转动轴瞬间急速反转使得制动棘轮产生过大离心力,制动限位棘爪将制动棘轮啮合锁死,本装置就有效起到了避免现有的制动失效带来的风险和隐患。
Centrifugal force emergency braking device for chain hoist
一种手动葫芦用离心力紧急制动装置
2024-03-29
Patent
Electronic Resource
Chinese
IPC: | B66D Haspeln , CAPSTANS |
Emergency braking and protecting device of construction hoist
European Patent Office | 2023
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