The lifting weight and rotation radius of an electric winch are key parameters that directly affect its load capacity and application scenarios. The following provides a detailed explanation from four aspects: definition, calculation method, influencing factors, and practical application:

1、 Lifting Capacity

Definition: The maximum load mass that an electric winch can lift vertically or drag horizontally under safe working conditions, usually measured in kilograms (kg) or kilonewtons (kN).

Calculation method:

Basic formula:

The weight increase is related to motor power, speed, reduction ratio, and drum radius. The simplified formula is:

Increase weight=

Motor speed x reduction ratio x drum radius x slope coefficient

0.95 x motor power

Motor power: measured in kilowatts (kW), determines the output power of the winch.

Motor speed: in revolutions per minute (r/min), affects the winding speed of the drum.

Reduction ratio: The ratio of motor speed to drum speed, which amplifies torque to lift heavy objects.

Roll radius: measured in meters (m). The larger the radius, the longer the length of the single-layer wrapped steel wire rope, but it needs to be matched with the motor torque.

Slope coefficient: Adjust according to the winch usage scenario (such as vertical and inclined shafts), and consider the impact of slope on load for inclined shafts.

Actual case:

SQ-1200/55 endless rope winch: power 55kW, traction speed 1m/s, traction force 50kN, wire rope diameter 22mm, maximum traction mass 20t (including transport vehicles), meeting the transportation needs of tunnels.

JD-1 type dispatching winch: motor power of 25kW, speed of 1470r/min, drum size of φ 300 × 356mm, wire rope diameter of 16mm, maximum tension of 16kN, suitable for dispatching mining cars underground.

Influencing factors:

Motor performance: The higher the power, the stronger the improvement ability.

Transmission efficiency: Friction losses of components such as reducers and bearings affect the actual output torque.

Steel wire rope strength: A steel wire rope with sufficient safety factor (such as safety factor ≥ 5) should be selected according to the load.

Environmental conditions: High temperature, humidity, or corrosive environments may reduce equipment performance.

2、 Rotation radius

Definition: The horizontal distance from the center of the electric winch drum to the winding point of the steel wire rope, measured in meters (m). It directly affects the winding method, load distribution, and equipment stability of the steel wire rope.

Function and impact:

Load distribution:

The larger the rotation radius, the fewer layers of wire rope winding, and the stronger the single-layer bearing capacity, but it requires more installation space.

A too small rotation radius may cause multiple layers of winding in the steel wire rope, increasing friction and wear, and reducing its service life.

Equipment stability:

The rotation radius should match the size of the winch base to avoid the risk of overturning due to a high center of gravity.

For example, the design of the rotation radius of the hydrological hoist electric winch needs to consider the swing amplitude of the hoist to ensure smooth operation.

Calculation example:

If the drum radius is 0.15m and the wire rope diameter is 16mm, the effective rotation radius is the drum radius plus the wire rope radius (0.15m+0.008m=0.158m).

In actual design, a safety margin should be reserved to prevent the steel wire rope from jumping out of the drum.

Design principles:

Standardization: Industry standard sizes (such as φ 300mm and φ 400mm drums) are preferred for easy maintenance and component replacement.

Modularization: Some winches support the replacement of drums of different sizes to adapt to different loads and space requirements.

Safety: The design of the rotation radius must comply with standards such as the Coal Mine Safety Regulations, and the torque of the braking device must meet the requirements

K≥3

(Braking safety factor).

3、 Collaborative design for improving weight and rotation radius

Load matching:

High load scenarios (such as mine hoisting) require a combination of high-power motors, high reduction ratios, and large rotating radius drums.

Small load scenarios (such as hydrological lifting boxes) can use low-power motors and compact drum designs to save space.

Efficiency optimization:

By adjusting the rotation radius and reduction ratio, balance the lifting speed and torque output. For example, increasing the rotation radius can reduce the required motor torque, but it requires increasing the drum size.

Variable frequency speed regulation technology can achieve stepless speed change and adapt to different load requirements.

Security redundancy:

During design, a 20% -30% load margin should be reserved to cope with sudden overload or dynamic impact.

The braking system needs to calculate the braking torque based on the maximum load and rotation radius to ensure reliable parking in emergency situations.

4、 Practical application suggestions

Selection criteria:

Select the winch model based on load quality, lifting height, and operating frequency. For example, in frequent start stop scenarios, equipment with excellent braking performance should be selected.

The influence of slope on load needs to be considered in inclined shaft transportation, and the slope coefficient and rotation radius should be adjusted.

Installation requirements:

Ensure that the winch base is firmly fixed and there are no obstacles in the rotation radius direction.

The steel wire rope should be wound neatly to avoid crossing or squeezing.

Maintenance points:

Regularly check the wear of the drum, wire rope breakage, and sensitivity of the braking device.

Adjust the rotation radius or replace the drum according to load changes to avoid long-term overload operation.

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