There are significant differences between explosion-proof chain hoists and manual tension controllers in terms of functionality, application scenarios, working principles, and explosion-proof design. The two are not directly related, but both serve industrial safety needs. The following is a specific analysis:

1、 Function and application scenarios

Explosion proof chain hoist

Function: As a manual lifting tool, it drives the chain wheel by dragging the bracelet chain, and drives the lifting chain to smoothly lift or pull heavy objects.

Application scenario: Specially designed for potential explosive environments such as petroleum, petrochemical, chemical, and coal mines (such as gas explosion-proof zones 1 and 2, dust explosion-proof zones 21 and 22), to prevent explosions caused by mechanical sparks generated by metal friction or impact.

Features: Using copper shell, copper plated steel chain or aluminum bronze, beryllium bronze materials to ensure no sparks are generated in hazardous environments.

Hand pulled tension controller

Function: Adjust the output torque by controlling the input current (such as magnetic powder clutch, brake) to achieve tension control of coil materials (such as strip and linear materials).

Application scenarios: Widely used in industrial fields such as textiles, printing, packaging, wires and cables that require precise tension control to ensure stable material tension during the production process.

Characteristics: Dependent on electric drive, feedback tension signal through sensors, and output control signal for actuators (such as motors) after processing by PID controller.

2、 Comparison of working principles

Explosion proof chain hoist

Mechanical transmission: Through the collaborative action of mechanical components such as hand chain wheels, friction disc ratchet wheels, brake seats, and gear sets, human power is converted into lifting power.

Braking mechanism: Adopting a ratchet friction plate one-way brake, it automatically brakes under load to prevent heavy objects from falling.

Hand pulled tension controller

Electrical control: By energizing the coil to generate magnetic flux, the input shaft and output shaft become rigid bodies rotating, and slip occurs when overloaded, achieving torque transmission and tension adjustment.

Feedback system: relying on tension sensors to detect the tension of the coil material, feedback the signal to the controller, and adjust the output of the actuator by comparing the set value with the actual value.

3、 Differences in Explosion proof Design

Explosion proof chain hoist

Material selection: The shell is made of copper alloy or explosion-proof alloy steel, and the chain is made of copper plated steel or copper to avoid friction sparks.

Structural sealing: Sealing gaskets or welding processes are used at the joints of the shell to prevent explosive gases or dust from entering the interior.

Applicable environment: Clearly labeled explosion-proof level (such as Ex d IIB T4 Gb), suitable for specific explosive areas.

Hand pulled tension controller

Explosion proof measures: If used in explosive environments, explosion-proof electrical components (such as explosion-proof motors, explosion-proof sensors) must be used and comply with relevant explosion-proof standards (such as GB 3836 series).

Isolation design: By isolating equipment such as transformers and safety barriers, the controller is electrically isolated from the hazardous area to prevent explosions caused by electrical sparks.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment