The safety of electric hoists has always been emphasized. The following is a comprehensive guide to the safe use of electric hoists.
I. Preparation before operation
1. Equipment inspection
Check whether the mechanical parts: hooks, wire ropes/chains, brakes, limiters, etc. are intact, without wear, breakage or deformation.
Electrical system inspection: the power cord, control buttons, and contactors are well insulated, grounded reliably, and the voltage is stable.
No-load trial run: test the lifting and left and right movement functions, confirm that the brakes are sensitive, and the limit devices are effective.
2. Environmental and personnel requirements
Clean the working area to ensure that there are no obstacles and irrelevant personnel.
Operators must be professionally trained and certified to work, and wear protective equipment (such as helmets and gloves).
II. Operating specifications
1. Lifting and moving
Vertical lifting: It is strictly forbidden to pull and tilt the lifting to avoid heavy objects shaking or losing control.
Smooth operation: Start/stop slowly to avoid sudden stop and start causing wire rope jump or equipment damage.
Limit protection: adjust the upper and lower limit blocks, and prohibit the hook from hitting the top or excessively descending (when there is no lower limiter, the lowest position must be manually controlled).
2. Load management
Overloading is strictly prohibited: the load shall not exceed 80% of the rated lifting weight, and a 125% overload test shall be performed for the first use of new equipment.
Secure binding: heavy objects must be evenly stressed, sharp parts must be protected with gaskets, and the hook locking device must be normal.
3. Safety distance and supervision
It is prohibited to stand under the hanging objects, and personnel are prohibited from rising and falling with the hanging objects.
When multiple people are working, a special person is required to command and agree to the operation signal.
III. Prohibited behavior and emergency handling
1. Operation is strictly prohibited
It is prohibited to leave the operating position when the hanging objects are suspended.
It is prohibited to use electric hoists to carry people or as elevator lifting mechanisms.
It is prohibited to use them forcibly when the power supply is abnormal (such as unstable voltage, phase loss).
2. Emergency handling
Brake failure: If the heavy object descends out of control, keep pressing the descending button until it lands, and do not turn off the power.
Abnormal shutdown: immediately cut off the power supply, troubleshoot, and prohibit operation with faults.
IV. Maintenance and care
1. Daily maintenance
Regularly lubricate the chain/wire rope, clean the dust and debris of the equipment.
Check the wear of the brake and replace the failed parts in time.
2. Professional maintenance
Perform a full machine inspection every quarter, including the gearbox, motor insulation, etc.
Record the usage, and immediately stop using and repair the hidden dangers.
V. Precautions for special scenarios
Mines/high temperature environment: Choose explosion-proof or high temperature resistant models to shorten the single operation time.
Mobile electric hoist: Ensure the stability of the track to avoid collision during movement.
Stage/high-altitude operation: Synchronous control of dual-track operation to prevent heavy objects from tilting.
Summary: The safe use of electric hoists requires the whole process of "inspection-standard operation-maintenance". The core is to avoid overloading, ensure reliable braking, and strictly abide by operating discipline. Specific parameters (such as limit adjustment, load standard) need to refer to the equipment manual and national standards.
