Weihua Explosion Proof Overhead Cranes

Safety and reliability is especially important in hazardous environments. All crane components of our explosion proof cranes are selected to ensure the high level of safety required for the hazardous atmospheres in chemical and petrochemical plants, pharmaceutical, oil refineries, gas power plants, shipyard, waste water treatment plants, paint shops and other industrial sites. Our hoists have been designed and built to provide years of reliable and safe operation.

Weihua explosion proof wire rope hoist cranes with our explosion proof electric hoist developed and manufactured for hazardous working environments with safety and reliability complies with IECEx and 94/9/EC ATEX standards and regulations. Our explosion proof cranes can be used in explosive atmospheres (gas Zone 1 and Zone 2, dust Zones 21 and 22), with a rated load from 3,200 kg to 50,000 kg and standard working duty FEM 2M.

 

Modular and Compact Design

 

• The crane main girder made of computer-optimised box sections, end carriages are made of torsionally rigid, welded box-section design. The Main beam and end beams connect with high strength bolts, our high precision processing equipment ensuring the connection accuracy and make the crane run smoothly.

 

• The modular design uses a combination of high-quality parts and serial modules to form a rich product specification, modularization, standardization, and mass production mode to ensure product quality, shorten manufacturing period, easy transportation and installation.

 

• By using compact hoist and high strength materials, the crane has much smaller sizes, wheel load and weight, which can decrease the height of building and reduce the plant construction cost.

 

• Compact structure, low clearance, small dimension and large work scope, improving production efficiency.

 

Advanced Manufacturing Technology

 

• Advanced steel plate pretreatment production line for shot blasting, painting and drying. Shot blasting grade reaches Sa2.5 and surface roughness (Rz) is 40～80μm. Primer spraying will be done within a specified time after the pretreatment to prevent rust, steel materials for main beam, girders will be transferred to fabrication workshop for cutting after pre-process.

 

• The crane main girder, end carriages and trolley frame adopts our robot automatic welding technology, automatic double-sided intermittent welding technology for the reinforced angle steel weld on the main beam cover web and gantry submerged arc welding for longitudinal weld on the outside of the main beam, all ensuring the highest welding quality.

 

• The industry leading technology and application of modular interchangeability of crane main girder and end beams.

 

• The industry leading crane bridge frame and trolley frame processing technology after welding, achieving the high efficiency and stable processing accuracy of the overall crane processing technology after welding.

 

• The industry leading automatic spraying production line includes three workshops of sandblasting, painting and drying. Safety, reliable and environmental.

 

High Safety, Reliability, Efficiency and Maintenance Free

 

• BNR Explosion-proof hoists offer high performance, easy load handling, improved reliability and safety.

 

1. Explosion-proof class up to Exd Ⅱ CT4/Ex tD A21 IP65 T130℃

2. Dual speed hoisting motor and variable frequency control travelling motors enables easy and accurate load handling.

3. Heavy-duty 50% ED hoisting motors and 40% ED travelling motors with thermistors for overheat protection.

4. Electro-mechanical overload protector.

5. 2-step hoisting limit switch for safe load handling.

6. Hoist electrics with main contactor and 48V contactor control.

7. Hoisting and travelling motor protection IP65.

8. Pendant and remote operation panel with an emergency “stop” button.

 

• Safety monitoring systems for hoisting and travelling mechanism, many functions can be achieved according to the demands of users.

 

• The crane provides with many protection including linkage, overload protection, zero protection and limit protection, ensuring the crane always under safety operation.

 

• The crane provides with advanced PLC automatic detection function, which can perform measurement, calculation and monitoring to the performance, safety and working condition in order to ensure more safe and reliable transportation of items.

 

• The Crane Standard working duty is FEM 2M/ISO M5, equipped with our ND or NR series electric rope hoist with 1,600 hours of service at full load.

 

• Standard dual speed for hoisting and variable frequency drive (VFD) control speed for cross and long travelling. Which improve load handling and reduce load sway motions.

 

• Electric Components. Electrical components uses ABB, Siemens and Schneider international brands, the service life is not less than 500,000 times.

 

• Brake life cycle 1million times, gear reducer 10 years maintenance free.

 

Definition for Hazardous Locations According to ATEX

 

• Ex Zones – Gas Environment

 

Zone 1

A place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally.

 

Zone 2

A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

 

• Ex Zones – Dust Environment

 

Zone 21

A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.

 

Zone 22

A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

 

Explosion Hazardous Areas Zones Separation
Zone Gases	Zone Dusts	Probability of an explosive atmosphere
0	20	Very High –Explosive atmosphere is continual or very frequent.
1	21	High –Explosive atmosphere is occasional.
2	22	Low – Explosive atmosphere rarely occurs.