The factors that affect the performance, safety, and lifespan of a lever chain hoist in daily use can be summarized into five dimensions and 20 specific elements, which need to be comprehensively analyzed and managed according to actual scenarios

1、 Operational behavior and habits

Operational standardization

Emergency stop and start: Sudden start/stop will generate chain impact force, accelerate chain link wear or breakage, and slow acceleration/deceleration operation should be used.

Diagonal pulling and hard pulling: Non vertical force on the chain (angle>5 °) can easily cause derailment or lateral stress concentration, leading to chain jamming or breakage.

Overloading operation: Loading beyond the rated value can disrupt the balance of the lever, leading to brake failure, structural deformation, and even overturning. It is necessary to strictly follow the load markings.

Operator skills

Untrained personnel may accidentally touch safety devices (such as closing torque limiters) or fail to master precise control techniques (such as speed control), increasing the risk of accidents.

2、 Maintenance frequency and quality

Lubrication management

Chains, gear sets, and pulley sets need to be regularly coated with lithium based grease (once every 3 months for high-frequency use). Insufficient lubrication can accelerate wear, leading to jamming or abnormal noise.

The hydraulic system needs to be regularly replaced with hydraulic oil that meets the ambient temperature (such as low-temperature anti coagulation type). Oil contamination or deterioration can affect braking performance or hydraulic cylinder efficiency.

Component wear monitoring

Chain links with wear exceeding 10% need to be replaced as a whole; The radial wear of the pulley groove reaches 1/4 of the rope diameter and needs to be replaced; Brake wheel wear exceeding 1-2mm or rim thickness wear exceeding 40% requires immediate replacement.

Gear sets (such as ratchet gears and worm gears) need to be checked for tooth thickness wear exceeding 15% and keyway crushing to avoid slipping or breakage.

3、 Adaptability to environmental conditions

Temperature and Humidity

Low temperature environment (<-20 ℃) may cause hydraulic oil to solidify and chain brittleness; High temperature environment (>40 ℃) may cause motor overheating and grease failure, requiring adjustment of operating time or strengthening of heat dissipation/insulation measures.

In humid or corrosive environments (such as chemical and offshore platforms), anti-corrosion coatings and rust proof chains should be used, and the corrosion of metal components should be regularly inspected to avoid a decrease in strength caused by rusting.

Ground and support

Uneven or partially suspended ground can cause uneven stress on the supporting legs/rollers, increasing the risk of overturning; Soft soil foundation requires the laying of steel plates or roadbed boxes to expand the effective support area.

Vibration environment (such as nearby construction machinery) may affect equipment stability, and shock absorption measures or adjustment of operation time are required.

4、 Load and stability management

Dynamic adjustment of rotation radius

In narrow spaces, the rotation radius needs to be reduced (such as 3 meters), and in open areas, it can be expanded to 15 meters, but it is necessary to ensure that the total moment (G_load × L_load) does not exceed the counterweight moment (G_counterweight × L_counterweight) to avoid overturning.

When lifting multiple machines, it is necessary to coordinate load distribution and rotation radius to avoid local overload or imbalance. The principle of "three-point one arc" should be followed to ensure the stability of the center of gravity.

Load type and fixation

Loose or irregular loads require the use of specialized lifting equipment (such as slings, baskets) and secure them firmly to avoid slipping or swinging during the lifting process, which may cause impact loads.

Dynamic loads (such as shaking equipment) require an increase in safety factor or the use of shock absorbers to reduce impact force.

5、 Safety devices and compliance

Safety device status

The normally closed brake needs to automatically lock when power is cut off, and failure may cause heavy objects to fall; Torque limiters and overload alarms need to be calibrated regularly to avoid accidental triggering or failure.

Limit switches and wind speed sensors need to be sensitive. If the end limit switch is activated, the main contactor should be immediately released to avoid mechanism overshoot.

Compliance standards and inspections

It must comply with standards such as ISO 4306 and GB/T 3811, pass certifications such as CE and UL, and undergo regular third-party testing (such as annual safety assessments).

Operators must hold certificates and be familiar with emergency response procedures (such as the use of emergency stop buttons and personnel evacuation routes), and regularly participate in emergency drills.

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