Precautions for explosion-proof pneumatic hoist in different stages of use

1、 Installation and debugging phase

Selection and installation of explosion-proof electrical components

Core requirement: Select explosion-proof electrical components that are suitable for explosive environment hazard levels (such as IIA, IIB, IIC), such as explosion-proof motors, increased safety power switches, etc.

Operation points:

Ensure that all electrical components have passed explosion-proof certification and meet the explosion-proof level requirements for explosive gases or dust on site.

The cable wiring adopts explosion-proof "d" or increased safety "e" design, and there should be no joints in the middle of the cable. If necessary, explosion-proof junction boxes should be installed.

Priority should be given to using non sparking materials (such as copper alloy) for key components such as brakes and limit switches to prevent mechanical friction from generating sparks.

Explosion proof treatment of mechanical structures

Core requirement: Eliminate the risk of friction sparks from mechanical moving parts such as gears, chains, and wheels.

Operation points:

The surface of the hook is wrapped with a copper alloy layer to prevent sparks from collision.

The anti stripping groove device for steel wire rope is made of copper alloy or non sparking material.

The wheel tread and insulation parts should be made of non-metallic materials, and the surface resistance should reach the standard value to avoid static sparks.

Sealing inspection of pneumatic system

Core requirement: Ensure that the pneumatic system is leak free and prevent compressed air leakage from causing safety hazards.

Operation points:

Check the sealing of the cylinder, air pipe joint, and solenoid valve, using a compression nut type introduction device and rubber sleeve circular cable.

Lubricate components such as pneumatic motors and cylinders to reduce frictional resistance.

2、 Daily operation phase

Operating standards and load management

Core requirement: Avoid overloading and unauthorized operations to prevent equipment damage or explosion risks.

Operation points:

Overloading is strictly prohibited to ensure that the actual load does not exceed the rated load of the hoist.

Operators need to receive professional training and be familiar with the start-up, operation, and shutdown processes of explosion-proof hoists.

Avoid frequent start stop or sudden braking to reduce mechanical impact and inertia force.

Environmental monitoring and maintenance

Core requirement: Real time monitoring of the operating environment to prevent excessive concentration of explosive mixtures.

Operation points:

In flammable and explosive places, ensure good ventilation and reduce the concentration of explosive gases or dust.

Regularly clean the surface dust and oil stains of the equipment to prevent impurities from entering the pneumatic or electrical system.

Check the tightness of the explosion-proof shell bolts and the cleanliness of the explosion-proof surface to prevent explosion-proof failure caused by looseness or corrosion.

EXCEPTION

Core requirement: Timely detection and handling of abnormal phenomena to avoid the expansion of faults.

Operation points:

If slow movement, air leakage or abnormal noise is found, immediately stop the machine for inspection, and check for gas source pressure, seal or mechanical component faults.

Regularly inspect protective devices such as limit switches and safety valves to ensure accurate positioning, flexible and reliable operation.

3、 Regular maintenance phase

Electrical system maintenance

Core requirement: Ensure stable explosion-proof performance of electrical components and prevent arc, spark or overheating phenomena.

Operation points:

Check if the wires are damaged and replace aged or worn cables in a timely manner.

Verify the sensitivity of devices such as leakage protectors and explosion-proof limit switches to ensure their reliable operation.

Clean and anti-corrosion treat components such as explosion-proof solenoid valves and contactors to extend their service life.

Lubrication and replacement of mechanical components

Core requirement: Reduce mechanical wear and prevent the generation of friction sparks.

Operation points:

Regularly lubricate moving parts such as cylinders, pistons, chains, and gears, and replace severely worn seals or bearings.

Check the wear, breakage, and corrosion of the steel wire rope, and replace any steel wire rope that does not meet the standards in a timely manner.

Adjust the brake clearance to ensure reliable braking performance and prevent sparks from friction between the brake wheel and brake shoe.

Pneumatic system pressure calibration

Core requirement: Ensure stable pressure in the pneumatic system and meet the operational requirements of the equipment.

Operation points:

Regularly check the output pressure of the air compressor to ensure it is stable within the range required by the hoist (such as 0.5-0.6MPa).

Verify the set pressure of speed control valves, safety valves, and other devices in the pneumatic system to prevent loss of control due to abnormal pressure.

4、 Long term shutdown and restart phase

Handling before long-term discontinuation

Core requirement: Prevent equipment from being damaged or experiencing a decrease in explosion-proof performance due to environmental factors during downtime.

Operation points:

Thoroughly clean the gourd to remove surface oil stains and impurities.

Apply rust proof grease to key components such as cylinders and chains to prevent rusting.

Cut off the power and gas supply, and move the gourd to a dry and ventilated storage area.

Inspection and testing before restart

Core requirement: Ensure that the device can operate safely and stably after restarting.

Operation points:

Check the insulation performance of the electrical system to ensure that there are no short circuits or leakage phenomena.

Perform pressure testing on the pneumatic system, identify leakage points, and repair them.

Conduct a no-load test run and observe whether the hoist operates smoothly without any abnormal noise.

Gradually load to the rated load and verify the effectiveness of the overload protection device.

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