MD1 Two-Speed Wire Rope Electric Hoist

Two-Speed Control for Precision Positioning: Equipped with a two-speed cone rotor brake motor, the hoist delivers fast lifting at 8m/min (7m/min for 10t models) and creep speed at 0.8m/min (0.7m/min for 10t models) for fine positioning. Ideal for equipment installation, mold alignment, and other applications requiring slow, precise adjustment.

Compact Design, Light Dead Weight: The three-stage helical gear reducer, with gears and gear shafts made of heat-treated alloy steel, keeps the unit compact and lightweight (the MD1-1t weighs just 185kg), making installation and maintenance easy.

Dual Limit Protection: Upper and lower travel limit switches are built into the control box. In an emergency, the main circuit can be cut off to ensure safe and reliable operation.

Smooth and Quiet Operation: The gearbox housing and cover are precision-cast from high-quality cast iron with effective sealing. Combined with helical gear meshing, the hoist runs smoothly with low noise, making it suitable for continuous indoor workshop duty.

No External Brake Required: The hoisting motor is a high-torque cone rotor asynchronous motor with integral braking capability, eliminating the need for an external brake and reducing maintenance points.

The working principle of the MD1 two-speed wire rope electric hoist is based on a cone rotor brake motor driving a three-stage helical gear reduction mechanism:

① Hoisting Drive: When the cone rotor motor is energized, axial magnetic force overcomes spring pressure to release the brake. The rotor drives the fan wheel, transmitting torque through a spline coupling to the three-stage reduction gearbox. After reduction, the final gear stage rotates the drum, which winds the wire rope to raise or lower the hook.

② Two-Speed Switching: The motor stator winding is designed with a two-speed configuration. By switching the pole count via the fast/slow selector on the pendant, the operator can choose between fast speed (8m/min) and creep speed (0.8m/min). Fast speed is used for unloaded travel or long-distance lifting; creep speed is engaged near the target position for precise and safe placement.

③ Travel Drive: When mounted on an electric trolley, the travel motor drives the driving wheel along the lower flange of the I-beam through open gearing, while the driven wheel follows, enabling horizontal movement of the hoist along the rail.

④ Braking Principle: When power is cut, the cone rotor is axially pressed against the conical brake ring by spring force, generating friction torque that rapidly stops the motor rotor. Simultaneously, the electromagnetic brake engages, providing dual braking to ensure the load remains securely suspended.

The MD1 two-speed wire rope electric hoist consists of the following core components:

Cone Rotor Motor: Two-speed cone rotor brake motor (with integral braking), providing power to the hoisting mechanism. The motor features a built-in conical brake ring that engages automatically when power is off.

Reducer: Three-stage helical gear reduction mechanism with gears and gear shafts made of heat-treated alloy steel. The housing and cover are precision-cast from high-quality cast iron with effective sealing.

Drum Device: The wire rope winds around the drum, whose grooved profile guides the rope into orderly layers, preventing tangling and rope jumping.

Wire Rope: Heavy-duty crane wire rope (6×19+IWR construction) with a strength grade of 1570–1770MPa for long service life.

Hook Device: Forged hook block assembly including pulley, hook beam, and hook latch. Rotates smoothly and provides safe load handling.

Control Box: Houses the upper/lower travel limit switches, emergency cut-off device, and electrical control system. In an emergency, the main circuit can be interrupted to protect the equipment.

Push-Button Pendant: Handheld pendant available in tethered and wireless remote versions. Button layout includes fast/slow switching, up/down, left/right, and other operating controls.

Electric Trolley (Optional): The travel motor drives the driving wheel along the I-beam rail through open gearing, enabling horizontal transport.

The MD1 series two-speed wire rope electric hoist is widely used in the following scenarios:

Factory Workshop Assembly: Equipment installation, mold changes, and workpiece handling. The two-speed function is particularly suited for assembly stations requiring slow-speed positioning accuracy.

Warehouse Loading & Unloading: Used with electric single-girder or suspension cranes for lifting and loading/unloading warehouse goods.

Docks & Shipyards: Material handling and equipment hoisting. The multi-layer protection design adapts to the humid marine environment.

Power Station Maintenance: Hoisting for generator sets and transformer maintenance. The slow speed setting ensures precise positioning of large components.

Logging Yards: Lifting and handling of heavy materials such as logs and timber.

Additionally, the MD1 can be mounted on manual single-girder cranes, bridge cranes, cantilever cranes, and gantry cranes as a hoisting mechanism, meeting customized requirements across various working conditions.

Operating Conditions: Ambient temperature -20°C to +40°C. Duty cycle: medium duty JC25%, heavy duty JC40% (with a 30% reduction in lifting capacity). Protection rating: IP44–IP55.

Pre-Operation Checks: Inspect the wire rope for broken wires, wear, or twisting; check the hook safety latch for proper function; verify that the control buttons respond correctly; confirm the limit switches are fully operational.

Operating Procedures: Before lifting, ensure the load weight does not exceed the rated load. Use the fast speed for no-load or long-distance lifting, and switch to slow speed when approaching the target position. Never lift loads at an angle or drag loads sideways. Do not move loads over personnel. Keep your hand on the control pendant at all times during operation, ready to press the Emergency Stop.

Maintenance: Check wire rope lubrication every shift; inspect brake cone wear (≤1.5mm) monthly; check the reducer oil level and seals quarterly; perform a comprehensive annual inspection and load test.

Precision Manufacturing, Direct from the Source: The core components of the MD1 two-speed electric hoist (Conical Rotor Motor, Reducer Gear, and Drum) are all manufactured in-house, with full quality control from raw material intake to finished product dispatch. Each hoist undergoes a 2-hour full-load test before leaving the factory, with a hoisting braking distance of ≤50mm and a brake cone clearance of ≤1.5mm.

Core Advantage of Two-Speed Design: The fast/slow speed ratio is precisely controlled at 8:0.8 (7:0.7 for the 10t model), achieving a slow-speed positioning accuracy of ±5mm. Compared to the CD1 single-speed hoist, the two-speed control system improves precision installation efficiency by 40% while reducing the risk of load collision.

Full-Stock Availability + Non-Standard Customization: Standard models from 0.5t to 20t are kept in stock and dispatched within 3 working days of order confirmation. Lifting heights can be customized within the 6–30m range. For special rail interfaces, explosion-proof protection, wireless remote control, and other non-standard configurations, please contact our technical team for immediate response.

Q: What is the difference between the MD1 two-speed electric hoist and the CD1 single-speed electric hoist?

A: The MD1 adds a slow speed setting (8/0.8m/min two-speed) to the CD1 design, allowing the load to be switched to slow speed for precise positioning as it nears the target. The CD1 is single-speed (8m/min) and lacks fine adjustment capability. The MD1 is suited for applications requiring precision installation and mold alignment; the CD1 is suitable for general lifting and handling tasks. Additionally, due to the added two-speed motor and control system, the MD1 weighs approximately 20–30% more than a CD1 of the same capacity.

Q: Which national standards does the MD1 wire rope electric hoist comply with?

A: The design & manufacturing of the MD1 series wire rope electric hoist strictly complies with GB/T 3811 Crane Design Standard and JB/T 9008.1 Wire Rope Electric Hoists. Electrical safety meets the requirements of GB 5226.1 Safety of Machinery — Electrical Equipment. Installation, retrofitting, and supervision inspection are carried out in accordance with TSG Q7014 (Special Equipment Safety Technical Regulation) for the installation, retrofitting, and major repair of lifting appliances.

Q: What is the price of the MD1 two-speed electric hoist?

A: The price of the MD1 two-speed wire rope electric hoist varies depending on capacity and configuration: 0.5~1t models are approximately ¥3,000~6,000, 2~5t models are approximately ¥6,000~15,000, and 10~20t models are approximately ¥15,000~40,000. For non-standard customizations (special lifting heights, wireless remote control, explosion-proof configurations, etc.), the price will be calculated separately based on your specific requirements. Volume purchases are eligible for discounts. For a detailed quotation, please call 13903802779.