Analysis of lifting components and rotation radius of running pneumatic hoist

1、 Lifting components: core structure and function

The lifting system of the running pneumatic hoist consists of five core modules: pneumatic motor, reducer, hoisting mechanism, braking device, and lifting device. Each module works together to achieve the lifting and positioning of heavy objects.

pneumatic motor

Power source: Compressed air (pressure 0.4-0.6MPa) is used as the medium to generate power through the rotation of blades or pistons.

Advantages: Non sparking, explosion-proof, suitable for flammable and explosive environments (such as chemical and coal mines); Compact structure, weighing only 60% -70% of the same capacity electric hoist.

Case: German JDN blade type pneumatic motor achieves high torque output through three-stage planetary reduction, with a lifespan of up to 100000 cycles.

reducer

Function: Reduce the high-speed rotation of the pneumatic motor (usually 3000-5000rpm) to the required speed of the hoisting mechanism (5-17m/min), while increasing the torque.

Type: Mainly composed of three-stage planetary reducers, with a reduction ratio of 1:100 or more, ensuring smooth lifting of heavy objects.

Data: The input shaft torque of a certain model of reducer is 50N · m, and the output shaft torque can reach 5000N · m, meeting the load demand of 30 tons.

Winch mechanism

Composition: Chain wheel, chain (or wire rope), hook assembly.

Function: The sprocket meshes with the chain to achieve weight lifting and lowering through rotation; The hook assembly is equipped with a safety lock to prevent detachment.

Comparison: The ring chain hoist chain has high tensile strength (up to 2000MPa) and is suitable for high-frequency operations; The wire rope hoist is lighter in weight, but it requires regular inspection for broken wires.

braking device

Type: Normally closed spring brake, automatically locks when power or air is cut off.

Performance: Braking time ≤ 0.5 seconds, ensuring that heavy objects stop within a height of 0.5 meters and avoiding the risk of falling.

Case: A certain model of brake has passed CE certification and can work normally in an environment ranging from -20 ℃ to+50 ℃.

lifting appliance

Selection: Choose specialized fixtures based on the shape of the load (such as cylindrical or plate-shaped) to avoid uneven loading.

Safety factor: The rated load of the lifting device should be more than twice the actual load. For example, when lifting a 5-ton heavy object, the lifting device needs to carry 10 tons.

2、 Rotation radius: a key parameter for spatial adaptability

The rotation radius of the running pneumatic hoist is determined by the curvature radius of the track and the operating range of the trolley, which directly affects the flexibility of the operation.

Orbital curvature radius

Definition: The radius of the curved section of the track determines the minimum space for the gourd to turn.

Standard value:

Light gourd (≤ 5 tons): curvature radius ≥ 1.5 meters;

Heavy duty hoist (10-30 tons): curvature radius ≥ 3 meters.

Case: A certain automobile production line uses a track with a curvature radius of 2 meters to achieve a 90 ° turn and adapt to a narrow workshop layout.

Vehicle operating range

Horizontal movement distance: determined by the length of the track, usually 5-30 meters, and can be customized for extension.

Positioning accuracy: By continuously adjusting the speed of the pneumatic motor, centimeter level positioning (± 5mm) is achieved to meet the requirements of precision assembly.

Data: A certain model of small car runs on a 10 meter track with a repeat positioning error of ≤ 3mm, suitable for engine assembly lines.

The relationship between rotation radius and homework efficiency

Small radius advantage: When the curvature radius is small (such as 1.5 meters), the gourd can turn in a smaller space, but the speed needs to be reduced to 50% of the standard value to avoid centrifugal risk.

Advantages of large radius: When the curvature radius is large (such as 3 meters), it can maintain high-speed operation (17m/min), improve work efficiency, but requires a larger workshop area.

3、 Selection suggestion: Optimize configuration based on the scenario

Space constrained scenarios (such as ship cabins)

Prioritize selecting tracks with a curvature radius of 1.5 meters, paired with lightweight hoists (≤ 5 tons), and control the operating speed through stepless speed regulation.

Case: A shipyard uses KHC pneumatic hoist with a track curvature radius of 1.8 meters to achieve precise lifting of heavy objects inside the cabin.

High frequency work scenarios (such as automotive production lines)

Select a track with a curvature radius of 3 meters, paired with a high-speed model (17m/min), and achieve fast positioning through wireless remote control.

Data: A certain production line adopts SAN-EI pneumatic hoist, with a daily operation volume of 200 times and a failure rate of less than 0.5%.

Explosion proof environmental scenarios (such as chemical workshops)

Confirm that the equipment has passed Ex d Ⅱ C T4 certification, and the track should be made of stainless steel material to prevent corrosion.

Case: A chemical enterprise uses JDN pneumatic hoist with a track curvature radius of 2.5 meters, which can operate continuously for 3 years without failure in an environment of -10 ℃.

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