The selection of electrical components for lever chain cranes should be closely combined with environmental conditions, following the three core principles of adaptability, protection, and reliability. Specific environmental factors and corresponding selection strategies need to be considered

1、 Environmental temperature and humidity

Temperature range: Electrical equipment should operate normally at an ambient temperature of 0-40 ℃. High temperature environments (such as steel mills and tropical regions) require the use of high-temperature resistant components (such as H-grade insulated motors), while low-temperature environments require the configuration of heaters or low-temperature lubricating grease; Extreme temperatures need to be regulated through thermal management designs such as heat sinks and insulation layers.

Humidity control: Relative humidity ≤ 50% (40 ℃), can be relaxed to 90% (20 ℃) at low temperatures. Damp environments require moisture-proof design (such as sealed junction boxes, moisture-proof coatings) to avoid condensation causing short circuits or corrosion; If necessary, install dehumidification devices or use moisture-proof components (such as IP65 and above protection level).

2、 Dust and corrosive gases

Dustproof level: Select the IP protection level based on the particle size of the dust (such as IP5X dustproof, IP6X dustproof). High dust environments (such as mines and cement plants) require fully sealed structures or positive pressure dust-proof designs to prevent dust from entering and causing poor heat dissipation or electrical short circuits.

Corrosion resistance: In corrosive environments such as chemical, coastal, and metallurgical industries, corrosion-resistant materials (such as stainless steel, nickel plated alloys) or surface treatments (such as galvanizing, epoxy coatings) should be selected; Areas with high incidence of galvanic corrosion should avoid direct contact between different metals and use insulation gaskets or coatings for isolation.

3、 Vibration and impact

Anti vibration design: Reduce the impact of vibration by using shock-absorbing brackets, elastic connections, or selecting anti vibration components such as seismic contactors and cables. Frequent vibration environments require verification of the mechanical life of components (such as contactors requiring millions of operating cycles) to avoid contact loosening or structural fatigue.

Impact protection: High strength structural components (such as reinforced shells and anti loosening bolts) should be selected for heavy or impact load scenarios to prevent component displacement or damage.

4、 Electromagnetic Compatibility (EMC)

Anti interference capability: The electrical system must comply with the IEC 61000-6-2 (anti-interference) and IEC 61000-6-4 (anti radiation) standards. Reduce electromagnetic interference through filters, shielding covers, and twisted cables; Separate the wiring of control circuits and power cables to avoid signal interference.

Grounding and shielding: Large cross-sectional wires (≥ 6mm ²) are used for grounding, and the metal components of the equipment are interconnected to form equipotential bodies; Sensitive components (such as PLC, touch screen) need to be separately shielded or equipped with filtering modules.

5、 Special environmental adaptability

High altitude: When the altitude is greater than 1000m, consideration should be given to the decrease in heat dissipation efficiency caused by thin air, and high-altitude motors or enhanced heat dissipation designs should be selected; The electrical clearance and creepage distance need to be adjusted according to altitude.

Explosive environment: Explosion proof areas require the use of explosion-proof electrical components (such as Ex d explosion-proof type, Ex e increased safety type) that comply with ATEX or IECEx certification standards.

Ionic/non-ionic radiation: Shielding materials (such as lead plates, conductive coatings) or anti radiation components should be used in the radiation environment to avoid insulation aging or misoperation.

6、 Other environmental factors

Salt spray and marine environment: Coastal or high salt spray areas require salt spray resistant coatings (such as galvanized+epoxy), sealed designs, and regular cleaning of salt deposits.

Pollution level: Select the sealing level (such as IP65/IP67) based on the type of pollutant (such as oil pollution, chemical gas) to prevent contamination from entering and causing poor contact or corrosion.

Suggestions for selection practice:

Standard compliance: Priority should be given to selecting components that comply with GB/T 4942.1 (IP protection), GB/T 20776 (crane safety), and IEC 61000 series standards to ensure compatibility with the characteristics and working conditions of the mechanism.

Redundant design: Key protective devices (such as overload protection and limit switches) need to be redundantly configured to avoid single point failures; Brakes and limiters need to be regularly inspected to ensure reliable operation.

Environmental monitoring: Install temperature and humidity sensors and vibration monitoring devices in extreme environmental areas to monitor environmental parameters in real-time and dynamically adjust equipment operation strategies.

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