Precautions and improvement suggestions for the use of hydraulic hooks at various stages

1、 Pre use inspection stage

Structural integrity check

Cracks and deformations: Clean the hook body with a non corrosive organic solvent, dry it, and use a magnifying glass or testing equipment (such as magnetic powder, ultrasonic) to detect surface and internal cracks. If cracks are found, they must be replaced immediately and welding repair is strictly prohibited.

Openness and wear: Measure the opening of the hook with a caliper. If it exceeds 10% of the original size (such as increasing the opening from 200mm to 220mm or more), it should be scrapped. At the same time, check the wear of the dangerous section (such as the hook body and hook handle). If the actual height is less than 95% of the basic size, it needs to be replaced.

Thread and corrosion: Check for corrosion on the thread and the operated shaft. After loosening the hook nut, if corrosion needs to be removed, the processing must not cause the diameter of the thread core to exceed 5%, otherwise it must be replaced.

Inspection of supporting components

Pulley and wire rope: Check whether the wear of the pulley groove and rim is uniform, and whether the wire rope matches the groove (the diameter of the groove should be larger than that of the wire rope). If the pulley is loose or shaking, it indicates that the bearing or shaft sleeve is damaged and needs to be replaced in a timely manner.

Anti decoupling device: Ensure that the anti decoupling device is complete and intact, capable of holding loose slings and lifting equipment on the hook, but cannot bear weight.

Rotating joint: Rotate the rotating joint by hand. If it is difficult to rotate or feels stuck, it indicates that the rotating bearing is damaged and needs to be replaced.

Safety device verification

Overload protection: Check the overload damage of the main hook, such as side plate elongation, aperture elongation, bolt bending or elongation, etc. If there is any abnormality, replace the damaged parts.

Braking system: Check the hydraulic system and hinge damage of the brake every week, observe the wear of the brake band and brake wheel, and regularly adjust the brake clearance (every 500 hours) to ensure stable braking performance.

2、 Operation stage during use

load control

Prohibit overloading: Strictly follow the rated load of the hook to avoid overloading causing the hook to break or deform.

Avoid lateral force: Maintain the balance of the suspended object, avoid diagonal pulling or bearing lateral force, as lateral force will reduce the load-bearing capacity of the hook by 50% -70%.

environmental adaptability

Protection against harsh environments: When working in environments with high dust, high temperature, high humidity, low temperature, high noise, strong winds, or poor lighting, it is necessary to strengthen equipment protection, such as dust covers, heating devices, etc., and shorten inspection cycles.

Corrosion environment response: In corrosive environments such as salt spray, it is necessary to shorten the hook inspection cycle (such as once a month) and take anti-corrosion measures (such as applying anti rust oil).

real-time monitoring

Abnormal response: If there is abnormal noise, vibration, or slow movement of the hook, the machine should be stopped immediately for inspection, and problems such as hydraulic system leakage, brake failure, or component wear should be investigated.

Data recording: Use monitoring equipment to track key parameters (such as hydraulic pressure and temperature), record equipment operation data for subsequent analysis.

3、 Post use maintenance phase

Cleaning and lubrication

Daily cleaning: Wipe the hook body after each use, remove oil stains and debris, and prevent corrosion.

Lubrication and maintenance: Regularly lubricate pulleys, rotating parts, and other parts with grease fittings, using the correct type and grade of lubricating oil to reduce wear.

Component replacement and repair

Replacement of vulnerable parts: Regularly inspect hydraulic oil pipes, seals, chains, and other vulnerable parts, and promptly replace worn or damaged components.

Professional maintenance: When equipment malfunctions or requires major repairs, it should be carried out by professional personnel to ensure the quality of maintenance.

Long term storage management

Rust prevention treatment: When the equipment is not in use for a long time, retract it, apply rust prevention oil, and regularly run it without load to prevent component corrosion.

Environmental control: The sealed environment should be dry and ventilated to avoid equipment damage caused by humidity and high temperature.

4、 Regular testing and scrapping stage

regular testing

Ultrasonic testing: The hook body should be inspected at least once a year, using methods such as dye penetrant testing, magnetic particle testing, ultrasonic testing, or X-ray testing to detect internal defects.

Size measurement: Measure the size of each hook and claw one by one. If it increases by more than 10% compared to the original size, it must be replaced.

Scrap standard

Mandatory scrapping conditions: When the hook has surface cracks, excessive opening degree, hook body torsion angle exceeding 10 º, dangerous section wear exceeding the standard, hook handle diameter corrosion exceeding the standard, or plastic deformation of the hook tail thread, it must be scrapped immediately.

Record traceability: Establish a maintenance ledger to record the history of hook replacement and fault situations for easy tracking and analysis.

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