The upper and lower limit protection system of the truss-specialized electric winch adopts a double-contact limit switch design, which can accurately set the lifting stroke threshold according to the height of the stage venue and the truss installation requirements. During the lifting or lowering process of the truss, once the preset limit position is reached, the truss-specialized electric winch will stop running immediately and accurately lock the truss in place. This not only prevents the truss from colliding with facilities such as ventilation ducts, fire sprinklers and lighting lines on the top of the venue due to excessive lifting, but also avoids the truss occupying too much stage activity space or interfering with actor movement and equipment debugging due to excessive lowering, making it suitable for the refined operation needs of space-constrained scenarios such as small theaters and banquet halls.
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