Two locking device of swift current car safety are prevented to beam -pumping unit

The utility model relates to a two locking device of swift current car safety are prevented to beam -pumping unit. Brake of beam -pumping unit internal expanding type and outer problem of embracing the easy swift current car in formula brake back that prior art exists have mainly been solved. Its characterized in that: two U type screw rods (2) are equipped with on the upper and lower tangential point face of big belt pulley (1), belt (5) respectively, wearing out two U type screw rods (2) opening both ends of big belt pulley (1) and connecting U type screw rod baffle (3), U type screw rod baffle (3) upper portion has connect spiral shell wand cap (4). This two locking device of swift current car safety are prevented to beam -pumping unit can effectively block tangential point plane department locking about big belt pulley, and the safety in production is guaranteed to effective brake back swift current car phenomenon of preventing. 本实用新型涉及种抽油机防溜车安全双锁定装置。主要解决了现有技术存在的抽油机内涨式刹车和外抱式刹车刹车后容易溜车的问题。其特征在于：所述大皮带轮（1）、皮带