What Should Be Paid Attention To When Buying A 75 Ton Bridge Crane

What Should Be Paid Attention To When Buying A 75 Ton Bridge Crane
 

1. "Safety Protection Device For 50 Ton Bridge Crane"
 

2. "Safety Inspection Of General Parts Of 25 Ton Bridge Crane"
 

3. Electric control device
 

(1) Control device.
 

It should be checked whether the electrical accessories are complete, whether the mechanical fixation is firm, not loose, and not jammed; whether the power supply cable is aged or exposed; the insulating material should be in good condition.
 

No damage and deterioration; bolt contacts, brushes and other connection parts should be reliable; the electrical equipment and electrical components selected on the 75 ton bridge crane should be compatible with the power supply, working environment and working conditions.
 

For bare wire power supply, check whether the external coloring and indicator light settings meet the requirements; for flexible cable power supply, check whether the cable retraction is reasonable; for collectors, check that the sliding wire is not bent in its entire length, and the contact is reliable without jamming.
 

(2) Electrical protection.
 

An easy-to-operate main isolating switch shall be provided at the incoming line of the 75 ton bridge crane, and an emergency power-off switch shall be provided on the crane, and it shall be checked whether the main power supply can be cut off. Check whether the crane power supply and each mechanism are equipped with short circuit protection, voltage loss protection, zero position protection, overcurrent protection, and overspeed and loss of excitation protection for special cranes.
 

Check the completeness and effectiveness of protection devices such as electrical interlocking, interlocking, and self-locking.
 

Check whether the insulation resistance of electrical lines, the grounding resistance of electrical equipment, and the grounding resistance of metal structures meet the requirements.
 

All electrical equipment on the 75 ton bridge crane should have reliable grounding (zero) protection for the normally uncharged metal casing, transformer core and metal isolation layer, threading metal pipe groove, cable metal sheath, etc., and metal structures.
 

4. Metal structure
 

The main stressed components should be checked for overall or local instability, fatigue deformation, cracks, severe corrosion, etc.
 

Whether the connections and welds of metal structures have obvious deformation and cracking.
 

Bolts or riveted connections shall not have defects such as looseness and defects.
 

Whether the high-strength bolt connection has sufficient preload.
 

The overall anti-corrosion paint of the metal structure should be good.
 

5. Cab
 

The firmness and reliability of the suspension and support connection of the driver's cab should be checked. The door lock and door electrical interlock switch, insulating floor and dry powder fire extinguisher of the driver's cab should be fully equipped and effective.
 

For 75 ton bridge cranes operating in harmful environments such as dust, poison, radiation, noise, high temperature, etc., it should be checked whether necessary protective devices are installed to protect the driver's health.
 

The driver's cab lighting and inspection lights must use a safe voltage within 36V.
 

6. Safety signs
 

It should be checked whether the lifting capacity signboard of the 75 ton bridge crane and the safety inspection pass mark of the technical supervision department are hung in obvious places. Cart slide line, sweeping rail plate, cable reel, spreader, trolley, rail clamp, slide line protection plate, jib frame, crane balance arm, boom head, outriggers, 75 with walkway ton Whether the outer side of the end frame of the bridge crane is sprayed with the color of the safety sign according to the requirements.