How To Check Crane Accessories 2 ?

How To Check Crane Accessories 2 ?

 

Crane accessories are extremely important for bridge cranes and gantry cranes, so how to check the quality of crane accessories after purchasing a crane?

 

In addition to the crane accessories mentioned in "How To Check Crane Accessories 1 ?", the following should be carefully checked:

 

(If you find any problems during the inspection, please contact us in time)

7. Signals and Lighting
 

(1) In addition to the electric hoist operated on the ground, all other types of cranes and elevators (including elevators) should be equipped with audio signal devices, and passenger elevators should be equipped with audio alarm devices.
 

(2) The three phases of the main sliding line of the crane should be equipped with indicator lights, and the colors are yellow, green and red. When the rail length is >50m, indicator lights should be installed at both ends of the slide line, and an indicator light for power transmission in the driver's cab should be installed under the main switch knife of the power supply.
 

(3) The crane cab lighting should use 24V and 36V safety voltage. The lighting lamp under the bridge frame shall adopt anti-vibration deep bowl lampshade, and a 10mm×10mm heat-resistant protective net shall be installed under the lampshade.
 

(4) Lighting power supply should be an independent power supply.

8. PE wire and electrical equipment
 

(1) The power supply of the crane should adopt TN-S (three-phase five-wire system) or TN-C (three-phase four-wire system) system to closely connect the PE line of the power grid with the crane track.
 

(2) The metal shells of various electrical equipment and facilities on the crane should be well connected with the metal structure of the whole machine; otherwise, connecting lines should be added.
 

(3) Repeated grounding measures should be adopted for the crane track. When the track length is > 150 m, two grounding points should be set on the diagonal line of the track. However, it is not required when there is a repeated grounding of the power grid within ≤ 50 m from the work site.
 

(4) The two rails of the crane should be firmly connected by connecting wires. The joints of the tracks at the same end shall be welded with jumper wires (except for the tracks on the steel girder frame). Cross-section requirements for connecting wires and jumper wires: round steel ≥ 30mm2 (φ6～φ8 mm), flat steel ≥ 150mm2 (3 mm×50mm or 4mm×40mm).
 

(5) The PE line of the elevator (elevator) should be directly connected to the general ground line of the machine room, and it is not allowed to be connected in series.
 

(6) The installation of electrical equipment and lines meets the requirements of the regulations, without aging, damage, electrical bare points, and temporary wires.
 

9. Guard rails and guard plates
 

(1) The exposed movable parts on the crane that may hurt people, such as couplings, sprockets and chains, transmission belts, pulleys, protruding pins, etc., should be equipped with protective covers.
 

(2) Protective railings should be installed on the outer side of the super-heavy machine that may cause people to fall. ).
 

(3) The sliding line guard plate shall be installed under the sliding line end beam of the bridge crane trolley to prevent the slings from touching (except for the safety sliding contact line that has been safely closed).
 

(4) The front edge of the crane wheel should be equipped with a rail sweeping plate, the distance from the rail surface is ≤10mm.
 

(5) The crane walkway plate should be welded with checkered steel plates with a thickness ≥ 4 mm, and there should be no warping, skewing, severe corrosion, or desoldering. There should be no reserved holes in the room. If there is no possibility of small objects falling, the hole diameter should be <50mm.
 

 

10. Rain cover, anchoring device
 

The rail clamp or anchoring device of the open-air crane should be flexible and reliable, and the electrical control part should have a rainproof cover. A number of drainage holes with a diameter of 50mm should be left on the walkway slab.
 

 

11. Safety signs, fire fighting equipment
 

(1) The tonnage signboard of the rated lifting capacity should be hung in a conspicuous position. The outriggers of the mobile crane, the end of the jib, the counterweight of the slewing, the side plate of the hook pulley, etc., should be painted with the color of the safety mark.
 

(2) The crane cab and elevator machine room should be equipped with small dry powder fire extinguishers, which should be used within the validity period and placed in a safe and reliable location.

 

12. Slings
 

(1) The slings should be stored at several points in a centralized manner, and be managed and maintained by special personnel. The storage point has a label with optional specifications and corresponding loads.
 

(2) The penetration length of the pipa head for binding the steel wire rope is 15 times the diameter of the rope and not less than 300 mm.
 

(3) Jigs, clamps, poles and chains should have no cracks, no plastic deformation and excessive wear.