When choosing a lever chain crane, a comprehensive evaluation should be conducted from six dimensions: load demand, structural performance, safety standards, environmental adaptability, maintenance costs, and compliance certification. Specifically, the following 20 core principles should be followed, combined with actual scenarios to ensure efficient, safe, and economical operation of the equipment:

1、 Clearly define load requirements and job scenarios

Rated load matching

Select the rated load according to the homework requirements to avoid the risk of overload. For example, light industrial scenarios can choose 1-5 tons, while heavy building scenarios need to choose more than 10 tons and reserve a safety margin of 10% -20%.

Rotation radius and operating range

Measure the maximum/minimum rotation radius of the workspace to ensure that the adjustable range of equipment arm length and elevation angle covers the requirements. For narrow warehouses, models with a rotation radius of ≤ 3 meters should be selected, while for open ports, models with a rotation radius of ≥ 15 meters can be selected.

Load type and fixing method

For irregular or dynamic loads (such as shaking equipment), specialized lifting devices (slings, baskets) or shock absorbers should be selected to reduce the risk of impact loads.

2、 Structural Performance and Mechanical Optimization

Leverage balance design

Verify the ratio of the power arm to the resistance arm (e.g. 3:1 can amplify the force by 3 times), ensure that the pivot position is optimized through finite element analysis, and avoid local stress concentration.

Chain and pulley system configuration

The chain should be made of high-strength alloy steel (tensile strength ≥ 800MPa), and the links should be regularly lubricated; The number of pulley groups needs to match the load requirements, such as reducing the tension to 1/n of the weight of the object with n sections of load-bearing ropes.

Rotation and braking system

Check whether the boom extension and elevation adjustment mechanism is smooth, and whether the hydraulic cylinder/gear set is well sealed; The brake should be normally closed, automatically locking when powered off, and the wear of the brake wheel should be ≤ 1-2mm.

3、 Safety devices and compliance with standards

Multiple safety devices

Confirm that the equipment is equipped with overload limiters, torque limiters, wind speed sensors, limit switches, etc. When overloaded, the output will be automatically blocked and an alarm will be triggered; The emergency stop button should be easily accessible with a response time of ≤ 0.5 seconds.

Compliance Certification and Standards

Must comply with international/domestic standards such as ISO 4306 and GB/T 3811, and pass certifications such as CE and UL to ensure compliance in design, manufacturing, and testing processes.

4、 Environmental adaptability and durability

Temperature and humidity adaptation

Anticoagulant hydraulic oil should be selected for low temperature environments (<-20 ℃); High temperature environments (>40 ℃) require enhanced heat dissipation; In humid/corrosive environments, anti-corrosion coatings and rust proof chains are required.

Ground support and stability

The ground should be flat and solid, with the supporting legs/wheels fully in contact with the ground; Soft soil foundation requires the laying of steel plates or roadbed boxes to expand the effective support area and enhance stability.

5、 Maintenance cost and operational convenience

Maintain convenience

Modular design (such as expandable boom) facilitates maintenance and replacement; Key components (gears, bearings) are easy to disassemble and inspect; The lubrication points are arranged in a centralized manner, making it easy to regularly add lubricating grease.

ease of operation

Driven by human or simple power, the operating handle and control panel conform to ergonomics, reducing operational fatigue; Operators must hold certificates and receive professional training before taking up their posts.

6、 Brand and after-sales service

Brand reputation and word-of-mouth

Choose well-known brands, refer to user reviews and industry cases, ensure reliable equipment quality, and provide comprehensive after-sales service.

After sales service network

Confirm that the brand has local after-sales service outlets that provide timely maintenance, spare parts supply, operation training, and other services to reduce downtime and maintenance costs.

7、 Dynamic testing and acceptance

No load and load testing

During acceptance, no-load and load tests must be conducted to verify that the lifting, rotating, and braking functions are normal, without any abnormal noise or vibration; The load test needs to be gradually loaded to the rated value to check the structural deformation and braking performance.

Safety device verification

Overload limiters and torque limiters need to be calibrated regularly to ensure sensitivity and reliability; Limit switches and emergency stop buttons need to be tested for response time and functionality.

8、 Cost benefit analysis

Initial procurement and long-term costs

Compare the initial procurement cost and long-term usage cost (maintenance, energy consumption, spare parts) of different models, and choose equipment with high cost-effectiveness; Leverage chain hoists typically have lower maintenance costs and are more economical to use over the long term.

Investment payback period evaluation

Evaluate the equipment investment payback period based on homework frequency and load requirements to ensure a reasonable return on investment.

9、 Customization for special scenarios

Special requirements for explosion prevention, corrosion prevention, etc

For special scenarios such as chemical engineering and offshore platforms, customized configurations such as explosion-proof motors, anti-corrosion coatings, and rust proof chains need to be selected to ensure the safe operation of equipment in hazardous environments.

Extended functionality and intelligence

According to the requirements, remote control operation, data monitoring (load, angle, temperature) and other extended functions can be selected to enhance the intelligence level of the equipment and achieve remote monitoring and fault warning.

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