The limit switch assembly of a chain hoist consists of a connecting rod, positioning clips, a rope guide, and the limit switch itself. The limit switch prevents the hook from rising beyond the designated upper limit, thereby avoiding issues such as "two-blocking" (over-hoisting) or wire rope breakage, and ensuring equipment safety. Incorrect installation renders the safety function of the limit switch ineffective; therefore, how should one install and adjust the limit switch on an electric hoist?
1. Loosen the screws on the striker blocks and position the blocks on either side of the rope guide's retaining plate, ensuring the plate can freely push the blocks. Start the motor to begin hoisting; the retaining plate will push the upper limit striker block. Stop the upward movement when the distance between the top edge of the hook pulley housing and the bottom edge of the drum housing is between 15mm and 50mm. Press the "down" button; when the hoist's rope guide has moved back by approximately 10mm, stop the machine. Slide the upper limit striker block close to the retaining plate and tighten the screws.
2. The adjustment method for the lower limit is identical to that of the upper limit, though the direction is reversed. However, when the hook is at its lowest position, at least three full wraps of wire rope must remain on the drum. After adjustment, perform a no-load test run to verify that the upper and lower limit installations meet requirements.
The above outlines the installation and adjustment procedures for chain hoist limit switches; we hope this information proves helpful. Our company is a professional manufacturer of lifting equipment with years of industry experience and extensive production expertise. We offer comprehensive services—including design, manufacturing, and installation—and provide a wide range of high-quality products in various specifications. We offer reasonable prices and excellent after-sales service; please feel free to contact us for inquiries or orders.
