Electric chain hoists are increasingly being used in a wide range of everyday applications today. But do you know the history and original design of the electric chain hoist? In the 1950s, Japan developed the electric chain hoist and, building on its rapidly growing economy, put it to efficient use in lifting and material-handling operations, achieving significant advancements. Since then, in response to the diverse needs of different markets, continuous efforts have been made to develop innovative electric chain hoists with a variety of styles and functions, expanding their scope of application ever further.

Product Structure and Features

1. Enclosure: The enclosure is made of aluminum alloy, which is both robust and lightweight. It also features specially designed heat sinks for excellent thermal dissipation, eliminating concerns about downtime caused by overheating. This design ensures high adaptability and makes the device suitable for a wide range of operating environments.

2. Side-mounted magnetic braking: Thanks to the addition of a new magnetic generator, magnetic braking can be activated instantly upon power cutoff, providing safer and more reliable deceleration—especially for heavy loads.

3. Limit switches: All suspended hoists are equipped with limit switches that automatically stop the operation to prevent overtravel of the chain, thereby ensuring reliability.

4. Chain Links: All chain links are made from imported alloy steel and undergo heat treatment to form a robust, durable chain capable of withstanding even the harshest operating conditions. They exhibit excellent resistance to corrosion from seawater, chemicals, rainwater, and other corrosive environments.

5. Hooks: Hot-forged, high-strength, and highly resistant to breakage. The lower hook can rotate 360 degrees, and its attachment ensures reliable operation.

6. Support: The heavy-duty support, composed of two steel plates, is exceptionally robust.

7. Transformers: available in 24V, 36V, 48V and other voltage ratings. During operation, in the event of an electrical leakage, measures are in place to prevent accidents, ensuring safe use even in rainy conditions.

8. Electromagnetic contactors: capable of high-frequency operation and withstand high duty cycles.

9. Reverse Protection Device: A special electrical device that prevents the control circuit from operating if the power supply wiring is incorrect.

10. Push-button switch: Uses a waterproof push-button switch that is lightweight and durable.

Overall Structure

The assembly consists of high-performance steel plate brackets that support the winch unit. On the right is the hoist motor, while on the left are the braking device and gear mechanism. For ease of repair and maintenance, the power supply and flashlight access doors are designed as plug-in modules. The main bracket is primarily fabricated from a single-piece steel plate with an unwelded structure, characterized by light weight, simple geometry, high production efficiency, and convenient maintenance.

(1) Round-link chain

Due to the specific operating conditions and characteristics of chains, they engage with sprockets at high speeds and are subjected to frequent dynamic loading; therefore, tensile strength, fatigue strength, toughness, and wear resistance are of paramount importance. Consequently, the materials used in roller chains must exhibit both quench-hardened (surface-hardened) properties and adequate toughness, and alloy steels that offer good formability, weldability, and resource efficiency must be developed. In addition, to ensure the balanced mass and operational safety of roller chains and to verify their reliability over time, all ring-type electric hoists undergo a tensile test at 1.5 to 2 times the rated load before leaving the factory, thereby guaranteeing safe operation for users.

(2) Stop the car

To accommodate high-speed, frequent operation, the hoist employs a dual-braking system consisting of an automatically adjustable primary brake and an auxiliary brake integrated within the motor. The primary brake is an electrically released, energized brake that engages when the power supply is cut off; it features automatic adjustment. Specifically, any increase in the electromagnetic pull caused by wear on the brake wheel is compensated for by the adjusting lever, which tracks (or follows) the change. If the travel becomes excessive, the adjusting screw can be rotated to restore the brake to its original, normal setting. Should the primary brake fail, the auxiliary brake will engage to maintain a constant descent rate, preventing uncontrolled acceleration under load. This is achieved through the use of a centrifugal-type brake—a compact, energy-efficient braking device that remains stationary unless subjected to an abnormal deceleration.

(3) Circuit

The manual pushbuttons in the control circuit are designed for 24-volt low voltage and feature a drop-resistant (water- and oil-proof) cartridge, thereby ensuring reliability. In addition, when using a three-phase current source, if the wiring sequence of the current source is incorrect, the lift limit switch will fail to operate properly; therefore, a reverse-polarity protection device has been incorporated. The principle behind this protection is to employ a phase-shifting circuit that uses relays to disconnect the control circuit in the forward, reverse, and reverse directions.