Explosion-proof Single Beam Overhead Crane

The explosion-proof single beam overhead crane is a specialized lifting solution designed for use in hazardous environments where explosive gases, dust, or other flammable substances are present. These cranes are built with safety features that minimize ignition risks, ensuring safe operations in industries such as oil and gas, chemical, mining, and grain processing facilities.

The explosion-proof single beam overhead crane's key features: Equipped with components that meet explosion-proof standards, including special motors, electrical components, and enclosures, the crane ensures safe use in classified hazardous areas.Constructed with durable, corrosion-resistant materials to withstand challenging environments and extend the crane's lifespan. Fitted with overload protection, emergency stop functions, and grounding features to prevent sparks or other ignition sources.Allows for smooth, accurate load handling, reducing risks and improving operational efficiency.Available in a range of load capacities, spans, and lifting heights to meet diverse industrial requirements.

The explosion-proof single beam overhead crane's technical specifications：Typically ranges from 1 to 20 tons, but custom configurations are available for higher capacities.Compliant with ATEX, NEC, or IECEx standards for safe use in explosive atmospheres.Can be customized based on specific application needs.Options for manual, semi-automatic, and fully automatic control systems.

4)The explosion-proof single beam overhead crane is an essential tool for industries working in hazardous environments, offering reliable and secure lifting operations. With its robust safety features and compliance with international standards, it provides a safe, efficient, and durable solution for heavy-duty material handling in explosive atmospheres.

Core Components: Gearbox, Motor

Place of Origin: Henan, China

Warranty: 2 years

Weight (KG): 3000 kg

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Control Method: cabin control/wire rope remote control

Lifting speed: 5-15M/MIN

Trolley running speed: 20-40M/MIN

Power Supply: 380V 50Hz or on request

Crane running speed: 50-100M/MIN

Protection grade: IP54

Insulation grade: F

Working Duty: A3

Color: Requst

Pictures & Components

1.Main beam

1) The main beam of an explosion-proof single beam overhead crane is a critical structural component designed to support the load and ensure safe operation in potentially hazardous environments. This type of crane is commonly used in industries where explosive gases, vapors, or dust are present, such as chemical plants, oil refineries, and manufacturing facilities with flammable materials.

The beam and all associated parts are designed to prevent the generation of sparks, which includes anti-static coatings or coverings.Components are enclosed or insulated in a way that meets industry explosion-proof standards, such as ATEX or IECEx, ensuring safety in hazardous atmospheres.The main beam is engineered to provide maximum load support and rigidity, ensuring minimal deflection under load.

3) The stability of main beam is crucial for precise and safe material handling, especially in environments where even minor accidents could have serious consequences.In a single beam crane, the hoist and trolley travel along the lower flange of the main beam, which simplifies the design and reduces the weight of the system compared to double-beam models.The single beam configuration is often more cost-effective and suitable for lighter load capacities.

2.Lifting System

Motor: The motor of an explosion-proof single beam overhead crane lifting system is a crucial component that ensures safe and efficient operation in environments where explosive gases or dust may be present. Key Features of Explosion-Proof Motor for Overhead Crane Lifting Systems:The motor is specifically designed to prevent any sparks or heat from igniting explosive gases or dust in hazardous areas.

Reducer: The reducer decreases the speed of the motor's rotation to provide a slower, more controlled movement of the hoist.It increases the torque transmitted from the motor to the hoist, allowing the crane to lift heavy loads.Explosion-proof reducers are designed to prevent sparks or heat from escaping and igniting any hazardous gases or dust in the surrounding environment. These reducers often feature sealed enclosures and are built to withstand extreme conditions.

Drum: The drum stores the lifting cable (or rope) that is wound and unwound to raise or lower the load. The drum rotates, typically powered by an electric motor with a reduction gearbox, to move the rope. In explosion-proof models, special attention is given to ensure that the drum's movement doesn't trigger any sparks.The drum works in tandem with the hoist, which uses the wire rope to lift heavy loads.The drum typically includes a braking system that ensures safe operation by preventing accidental lowering of loads, especially in hazardous environments.

Wire rope: The rope design would typically be a multi-strand construction that provides greater flexibility and higher load-bearing capacity. The rope might feature a higher number of strands and wires to distribute the load evenly and avoid breakage under high stress.Wire ropes used in such cranes are often lubricated to reduce friction, prevent wear, and protect against environmental damage. Special lubricants are used to ensure the rope maintains its strength and reliability over time.

Pulley block: Pulley Block is a system that contains one or more pulleys within a housing. It is part of the crane's lifting mechanism, which allows the wire rope or chain to move smoothly over the pulleys, reducing friction and ensuring efficient lifting. The pulley block helps guide and support the load being lifted.

Lifting device: The lifting system of an explosion-proof single beam overhead crane is designed to operate safely in environments where explosive atmospheres may be present, such as chemical plants, oil refineries, or mining sites. .

3.End carriage

Explosion-Proof Design:Constructed with materials that prevent sparking, such as non-ferrous metals or specially coated steel.All electrical wiring, motors, and control systems are enclosed in explosion-proof housings to prevent the ignition of any gases or particles present in the environment.The end carriage is sealed to prevent the entry of dust or gas that could lead to ignition.

Structure and Load-Bearing: The end carriage connects securely to the main girder of the single beam, supporting the weight of the load and distributing it evenly across the crane's structure.Built for heavy-duty usage, ensuring that the crane remains stable even when handling the maximum load capacity. Reinforced to prevent any bending or twisting under load pressure.

Wheel System: Often made from materials that don't produce sparks, such as nylon, copper alloys, or rubber-coated wheels.Designed to minimize friction and allow for smooth lateral movement along the crane rail, improving operational efficiency and control.Wheels are highly resistant to wear and corrosion, suited for long-term use in harsh conditions.

Motor and Control Mechanisms: The motors driving the end carriage are specially designed to contain any potential explosions within their casings. Equipped with control systems that allow for precise positioning of the crane, which is essential in hazardous environments.Adjustable speeds ensure safe maneuverability, helping the operator handle sensitive materials without sudden jerks or movements.

Safety Mechanisms: Integrated emergency stop systems that can cut power to the entire crane in case of any malfunction.Sensors that prevent the crane from lifting loads beyond its safe working limit.Stops the crane from over-traveling or moving beyond specified safe zones, reducing the risk of accidents.

4.Crane travelling mechanism

1) Working principle

The travelling mechanism is typically powered by electric motors, which drive the crane's wheels or trolleys along the runway. In explosion-proof cranes, the motors and electrical components are designed to be spark-resistant or enclosed to prevent ignition of flammable gases or dust in hazardous environments.The motor is usually connected to a gearbox that reduces the speed of the motor and transmits the rotational force to the wheels or trolley. The gearbox and transmission system are also designed to meet the explosion-proof standards by being sealed or housed in protective casings.The crane's movement is facilitated by wheels that run along rails (or runways) mounted on the overhead structure. These wheels are often made of materials that can withstand high stresses and resist wear. The wheels are driven by the motor and gearbox assembly, and their movement along the rail provides horizontal travel.

2) Functions of the crane operating mechanism

The motor powers the crane's movement along the runway. It is typically designed with explosion-proof enclosures to ensure that it does not ignite any combustible substances in the air.The motor drives a reduction gear that reduces the speed while increasing the torque. This is necessary for the crane to move smoothly and with sufficient force along its track.The traveling mechanism moves the crane along the girder, which is the main structural beam. The trolley holds the crane's hoist and moves across the girder as part of the traveling system.The crane is equipped with wheels that run along the tracks or rails, typically mounted on the side of the girder. These wheels are designed to carry the load and allow smooth travel. They may have roller bearings or ball bearings to reduce friction and wear.

5.Trolley travelling mechanism

1) Structural composition

Trolley Frame:The frame serves as the main structure supporting all other components of the trolley. It is designed to bear the load and ensure stability during operation. It is made from high-strength steel or other durable materials to withstand the mechanical stress and explosion-proof requirements.

Trolley Wheels and Bearings:The trolley has wheels that travel along the bridge's beam (usually a rail or track system). These wheels are typically mounted on bearings, which allow smooth movement along the beam while minimizing friction. The wheels may be equipped with a special coating or be designed to withstand explosive atmospheres to prevent sparks.

Drive Mechanism (Motor and Reducer):The trolley is powered by a drive system, which includes a motor (often explosion-proof) and a reducer to control speed and torque. The motor drives the gears and sprockets or chains that move the trolley along the beam.The motor is designed to prevent sparks or heat that could cause an explosion, adhering to strict explosion-proof standards.

Electromagnetic Braking System:A braking system, often electromagnetic in nature, is used to stop the trolley or hold it in place during operation. This system is crucial for safety in explosion-proof cranes, as it is designed to be spark-proof and prevent overheating or mechanical failure.

Explosion-Proof Electrical Components:The entire electrical system, including wiring, control panels, and switches, is designed to meet explosion-proof standards. These components are typically housed in sealed, explosion-proof enclosures to prevent any potential ignition sources in hazardous environments.The electrical control system may also include limit switches to ensure proper positioning of the trolley and safety systems to shut down the crane in case of a malfunction.

Safety Features:Safety is paramount, especially in explosion-proof cranes. Safety features include emergency stop buttons, overload protection, anti-collision devices, and other fail-safe mechanisms to prevent accidents during operation.The trolley may be equipped with sensors to detect the load and prevent excessive load or tipping.

Rail and Suspension System:The trolley moves along a rail system suspended from the crane's main beam. The rail must be level and precisely aligned to ensure smooth operation. The suspension system ensures that the trolley is properly supported and aligned with the beam.

Explosion-Proof Housing:Certain components, such as the motor, gears, and control panels, are enclosed in explosion-proof housings. These housings are designed to prevent any sparks or electrical failures from escaping into the surrounding environment.

Control System:A control system allows the operator to control the trolley's movement, speed, and position. It is connected to the electrical system and can include pendant controls or wireless systems. Explosion-proof controls are used to ensure that the operator is safe from electrical hazards in explosive atmospheres.

Load Hook or Suspension:The load hook or suspension mechanism hangs from the trolley, supporting the load being lifted or transported. The hook may be equipped with explosion-proof features to prevent accidental discharge of static electricity or sparks when handling explosive materials.

Anti-Sway Mechanism:Some explosion-proof cranes are equipped with an anti-sway system to stabilize loads during movement, especially in high-risk environments. This system helps to prevent load swinging, which could cause instability or accidents.

2) Function of the trolley operating mechanism

The travelling mechanism of an explosion-proof single beam overhead crane allows for the precise and safe movement of heavy loads in hazardous environments, while ensuring the protection of both the equipment and personnel from potential explosions.

6.Crane wheel

The crane wheels are mounted on the ends of the crane bridge or trolley. They allow the crane to move along the runway rails or tracks.These wheels are usually made from materials that can withstand high loads and harsh environmental conditions. In explosion-proof cranes, they are often constructed from high-strength steel to prevent sparks and minimize the risk of ignition in explosive atmospheres.

The design of the crane ensures that it meets stringent safety standards. For example, the crane wheel housing may be sealed to prevent the release of sparks or static electricity, which could ignite combustible gases, dust, or vapors in the environment.The explosion-proof design might include explosion-proof motors, electrical components, and control systems, ensuring that all parts of the crane are safe to operate in hazardous locations.

The crane wheels are designed to run smoothly on the overhead rails. They must be durable to endure the constant friction and wear from the movement of the crane, while also providing stability to support heavy loads.The rail system is part of a larger structure that ensures the crane stays aligned and operates with minimal vibration, which could otherwise generate sparks or other ignition risks.

7.Crane Hook

1) The hook and other components of the crane are built to prevent the initiation of sparks or heat that could cause an explosion. This includes using materials that do not easily generate sparks, as well as ensuring that all joints and connections are sealed and protected.The hook is typically made from high-strength, corrosion-resistant materials, like stainless steel or special alloys, to withstand harsh and potentially corrosive environments.

2) The hook is designed to carry heavy loads while maintaining structural integrity under extreme conditions. It usually includes safety features like anti-rotation devices, locking mechanisms, and other safety devices to prevent accidental detachment. Explosion-proof hooks are often custom-designed according to the class and zone of the hazardous area, in compliance with international standards (such as ATEX or IECEx certification)..

8.Motor

Explosion-Proof Motor Design:The motor is housed in an explosion-proof enclosure (often marked as "Ex"). This enclosure is designed to withstand an internal explosion and prevent sparks or flames from escaping, which could ignite the surrounding hazardous atmosphere.These motors are often certified under international standards such as ATEX (Europe) or IECEx (International), indicating that they are safe for use in specific explosive atmospheres.

Features of Explosion-Proof Motors: Explosion-proof motors are equipped with temperature control features to avoid overheating, which can be a source of ignition. These motors are designed to operate at lower temperatures compared to standard motors. Motors used in such cranes are made from high-quality, corrosion-resistant materials to withstand harsh environmental conditions like moisture, dust, and temperature extremes.The motor parts, including the bearings and commutators, are designed to minimize the generation of sparks, which could trigger an explosion.

Power and Speed: Explosion-proof motors for cranes typically range from low power (for lighter cranes) to higher power ratings (for heavy-duty cranes), typically measured in horsepower or kilowatts (kW).Depending on the crane's application, the motor may be coupled with a variable frequency drive (VFD) to control the speed of the crane's movements smoothly.

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Sound and light alarm system & limit switch

1) Sound and light alarm system

An explosion-proof single beam overhead crane typically operates in environments where there is a risk of explosion, such as in chemical plants, refineries, or other hazardous locations. The crane system is designed to handle explosive atmospheres while ensuring safety and preventing ignition.

Light Alarm: Explosion-Proof Signal Lights:These signal lights are used to indicate various crane operation statuses, such as operational readiness, emergency, or maintenance needs. The system generally includes different colored lights for different signals.Red is Emergency, stop, or danger signal.Yellow is Warning or caution signal (e.g., when the crane is in operation or in a limited state).Green is Safe or normal operation, indicating the crane is working as expected.The lights are housed in explosion-proof enclosures to prevent any internal ignition from escaping to the external environment.

Sound Alarms (Horns or Sirens):These alarms alert operators and nearby personnel to critical situations. The sound is loud enough to be heard over the noise of the machinery or equipment.Continuous Horn is Often used to signal an immediate danger or malfunction.Intermittent Horn can signal warnings or when the crane is approaching a danger zone.Multi-tone Alarm provides different tones for various operational states Like the lights, the sound alarms are housed in explosion-proof casings to ensure they do not pose a risk in an explosive atmosphere.

2) Limit switch

Limit switches on outdoor gantry cranes are crucial for safety and operational efficiency. They are used to prevent the crane from moving beyond its designated limits, which helps avoid collisions and accidents.

Functions: The limit switch is built to meet explosion-proof standards (such as ATEX or IECEx) to ensure that it does not cause sparks or heat that could ignite explosive gases, dust, or vapors in the surrounding environment.It helps to prevent the crane from operating beyond its capacity, thus preventing accidents such as tipping or mechanical failure due to excessive load.The limit switch stops the crane's movement once it reaches the maximum allowed travel in any direction, including the horizontal movement of the bridge and trolley, or vertical travel of the hoist.

Types: The limit switch can be mechanical (using a lever or roller mechanism to activate the switch) or electronic (using sensors such as optical, capacitive, or inductive to detect limits).

10.Safety Devices

Explosion-Proof Motor and Electrical Components：Explosion-proof motors and sealed electrical components prevent sparks and other electrical discharges that could ignite flammable substances.Enclosures for these components are usually rated according to standards such as ATEX or IECEx, which certify their ability to operate safely in explosive environments.

Anti-Collision Devices：Anti-collision systems, including infrared or ultrasonic sensors, help prevent collisions with other cranes, objects, or personnel in the work area, reducing risks in hazardous settings.

This device is especially important in areas with multiple cranes or restricted space.

Overload Protection System：Overload limiters prevent the crane from lifting loads exceeding its rated capacity. This helps prevent structural stress, tipping, and equipment damage.

Sensors can detect overload and trigger an alarm or automatically stop operations.

Emergency Stop Button：Emergency stop buttons are strategically placed on both the crane and remote controls, allowing operators or personnel to stop crane movement instantly if there's any danger.

In explosive environments, these buttons are built to withstand shocks and avoid accidental activation.

Spark-Resistant Components：Spark-resistant materials are used in parts that might otherwise cause sparks from friction. These materials include bronze or brass hooks, wheels, and other components in contact with other metals.

Limit Switches：Limit switches prevent the crane from moving beyond set points, such as the upper and lower limits of the hoist and the end of travel for the bridge and trolley.This helps avoid dangerous situations where the crane might move unexpectedly or reach a position that could damage surrounding structures.

Grounding and Anti-Static Measures：Grounding devices and anti-static systems prevent the build-up of static electricity, which could otherwise ignite flammable materials.Conductive grounding brushes, cables, or wheels can help dissipate static safely.

Enclosed and Protected Cables：Electrical cables and control wiring are typically enclosed in protective conduits or metal casings to prevent accidental damage or exposure to explosive gases.Special cable seals are used to ensure that no sparks can escape through wiring paths.

Temperature Control and Monitoring：Temperature sensors on motors, brakes, and other key components monitor for excessive heat that could ignite nearby substances.Systems may automatically shut down the crane if temperatures exceed safe limits.

Remote Control Operation：Explosion-proof remote controls allow operators to control the crane from a safe distance, minimizing exposure to hazardous areas.Remote controls are designed with special enclosures to avoid accidental discharges or damage in explosive settings.

11.Control Mode

Pendant Control：A wired pendant control allows the operator to control the crane from a safe distance. The pendant has buttons for moving the crane in various directions, hoisting and lowering, and emergency stopping.Maintains a safe distance from hazardous materials and crane operations. The pendant is explosion-proof and resistant to sparks, making it suitable for hazardous environments.

Remote Control: Wireless remote controls are often used to allow the operator complete freedom to move around the worksite while controlling the crane from a safe distance.Offers greater flexibility in movement and operation, improves safety by enabling the operator to maintain a greater distance from hazardous areas.

Cabin Control: For larger and more complex cranes, a cabin control setup allows the operator to sit in an enclosed, explosion-proof cabin with controls similar to those in pendant or remote configurations.Provides a clear line of sight over the work area and allows for precise control of the crane. Cabins are explosion-proof and often climate-controlled.

PLC (Programmable Logic Controller) and Automated Control Systems: PLCs can be integrated into the crane for semi-automated or fully automated operation. This is particularly useful in repetitive or hazardous tasks where minimal human intervention is preferred.Reduces the need for operator involvement in dangerous areas, ensuring safer operations. Enhances efficiency and consistency in repetitive operations.

Safety and Emergency Control Systems: In addition to the main control mode, explosion-proof cranes are equipped with various emergency stop controls, overload protection, and emergency braking systems to ensure safe shutdown in case of an emergency. Ensures quick response to emergencies and minimizes the risk of accidents in explosive environments.

12.Sketch

Main technical

Enhanced Safety for Hazardous Environments：Explosion-proof cranes are designed with specialized enclosures and materials that prevent sparks or electrical arcs, significantly reducing the risk of explosions in volatile environments.

Reliable and Durable Construction：These cranes are built to withstand harsh environments where exposure to corrosive gases, chemicals, or dust is common.

Lightweight Design and Improved Maneuverability：The single-beam construction is typically lighter than double-beam models, making it easier to install and operate in areas with limited space or lower load requirements.Its compact design allows for easier and more precise movement, improving efficiency in small or congested work areas.

Cost Efficiency：Single-beam overhead cranes are generally more cost-effective than double-beam versions, both in initial costs and in maintenance.Due to their simplified design and lower weight, they require less structural support and power to operate, reducing operational costs over time.

Versatile Applications：Single-beam overhead cranes can be used in a range of load capacities, typically supporting light to medium loads (1 to 20 tons), which is suitable for many industrial applications.

Reduced Installation Space Requirements：The single-girder design takes up less vertical and horizontal space, which is ideal for facilities with limited headroom or floor space.This allows for better use of available space and maximizes efficiency in smaller buildings or restricted spaces.

Ease of Maintenance：The simple design of a single beam makes maintenance and inspection more accessible, leading to lower downtime.Explosion-proof designs incorporate features that allow for safe and quick access to critical components for maintenance without compromising safety.

Customizable and Flexible Design Options：Explosion-proof single beam cranes can be customized with additional features like anti-collision devices, remote control systems, and overload protection, enhancing safety and usability.The flexible design also allows for integration with other equipment, such as specialized hoists or automation systems, catering to various industrial needs.

Petrochemical and Chemical Plants: Handling heavy materials in areas with explosive gases and chemicals.

Oil and Gas Refineries: Loading, unloading, and transporting equipment in zones with potential gas leaks.

Pharmaceutical Industry: Moving materials where solvents and other flammable substances may be present.

Mining Operations: Transporting loads in areas with combustible dust.

Paint and Coating Manufacturing: Handling large containers of flammable liquids and powders.

Grain and Food Processing: Managing bulk grain, flour, and other powders that may form combustible dust clouds.

1. Design and Engineering：Begin with an analysis of the explosion-proof requirements and operational environment where the crane will be used.Create specifications to meet industry standards for explosion-proof equipment, typically adhering to ATEX, NEC, or IEC standards, based on the zone classification.Select appropriate materials and components, such as motors, controls, and cables, that are designed for explosion-proof applications.

2. Material Procurement: Procure certified explosion-proof electrical components and materials (motors, wiring, enclosures) from approved suppliers.Select high-grade metals and alloys resistant to corrosion and spark generation, essential for hazardous environments. Use anti-corrosion and anti-static coatings, especially if the crane will operate in environments prone to moisture, chemicals, or dust.

3. Manufacturing and Fabrication: Manufacture the crane's main structural elements (girder, end beams, trolley) using welding and machining techniques to ensure strength and precision.Assemble the explosion-proof motor and hoisting mechanism with careful alignment to prevent sparking and ensure reliability.Manufacture or install explosion-proof electrical enclosures, ensuring they are sealed to prevent any flammable gases from entering. Install and wire explosion-proof control panels with insulated, spark-resistant wiring. Additional measures may include placing the control systems in safe areas or housing them in explosion-proof boxes.

4. Quality Control and Testing: Test the crane's load-bearing capacity to ensure it meets safety and operational standards. Conduct specific explosion-proof tests, such as checking for sparks and ensuring containment, to verify compliance with explosion-proof standards.Verify all electrical systems operate safely without arcing, sparking, or overheating, and ensure controls and safety systems are fully functional. Test coatings and materials for resistance to corrosion, particularly if the crane will be used in chemical-prone environments.

5. Assembly and Final Checks: Assemble the crane components, including the bridge, hoist, trolley, and electrical systems, in a controlled environment. Final InspectionPerform a thorough inspection to confirm that all explosion-proof standards and specifications have been met.Document all tests, inspections, and certification processes to ensure traceability and compliance with safety regulations.

6. Installation and Commissioning: Prepare the installation site, ensuring that it meets explosion-proof requirements and is clear of potential hazards.Assemble and install the crane on-site, following strict safety protocols to prevent damage or misalignment.Conduct load and functional tests post-installation to verify operational reliability and safety in the intended environment.

7. Certification and Handover: Obtain third-party certification for explosion-proof compliance if required by local regulations.Provide operator and maintenance training focused on explosion-proof equipment handling and safety.Provide the customer with full documentation, including maintenance manuals, certification, and operational guidelines.

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.