A screw hoist raises a sluice gate with a threaded stem. A winch hoist raises a sluice gate with a wire rope wound on a drum. The screw hoist is the usual choice for small and medium gates. The winch hoist is the usual choice for a heavy leaf or a long stroke.
Terms
Screw hoist. A gate hoist that turns a threaded stem to lift or lower the leaf. The stem length is matched to the gate.
Manual screw hoist. A screw hoist turned by hand. A side-crank model operates small irrigation and drainage sluice gates where there is no electricity. A heavy manual screw hoist is the unpowered option for a larger gate in the small-to-medium range.
Manual-electric screw hoist. A screw hoist with an electric drive and a hand crank as backup. A compact model is used where the hoist deck is small.
Electric screw hoist. A powered screw hoist for medium gates. A separate electric gate hoist can add local control and an optional remote station.
Winch hoist. A fixed wire-rope hoist. A drum and pulleys lift the gate. It is mounted on the hoist deck. A double-drum winch hoist is used for a heavy leaf and a long stroke, including reservoir, hydropower, and large regulator gates, where a screw stem would be too long.
The two drives are not interchangeable on a drawing. A manual screw hoist with a side crank suits a small canal gate and a site with no grid. A manual-electric screw hoist suits a retrofit where the platform is tight and the crew still needs a hand backup. A fixed winch hoist or a double-drum winch hoist suits a large sluice gate whose load and stroke are beyond a practical screw. Capacity is not a catalog default. It is calculated from gate weight, friction, and seating force, and the rope path has to match the civil layout.
A hydraulic hoist is a third drive. It is the cylinder system used on a hydraulic steel dam or a bottom-hinged steel flap gate. It is not a screw hoist and it is not a winch hoist.
Questions and Answers
Q: Can a small irrigation gate use a winch hoist?
A: A small sluice gate on a remote canal is normally a manual screw hoist with a side crank. A winch hoist is specified when the leaf is heavy or the stroke is long.
Q: What is a manual-electric hoist?
A: It is a screw hoist that runs on the motor and can still be cranked by hand. It is used where electric operation is wanted and a manual backup must remain.
Q: When is a double-drum winch hoist used?
A: When a heavy gate must travel farther than a practical screw stem, typically on a reservoir, hydropower, or large regulator opening. The rope reeving follows the drawing.
Q: What should be sent for a hoist quotation?
A: Send the gate type, clear opening, design water head, leaf material, lifting stroke, whether power is available, and whether the duty is a screw hoist or a winch hoist. Export / International Sales: +86 13903193904, sales@dequnwater.com.
Hebei Dequn Water Conservancy Machinery Co., Ltd. is the operator of this website, which serves as the official overseas website for Dequn's global B2B operations. The factory is in Xinhe County, Xingtai City, Hebei Province, China.
