What Are The Items To Check Before Installation Of A 25 Ton General Purpose Crane?

What are the items to check before installation of a 25 ton general purpose crane?

1. Technical documents should be complete;

2. According to the packing list inspection, the model, specification and quantity of materials and accessories should meet the requirements of the design and technical documents, and should have a factory certificate and factory test record;

3. There should be no deformation, damage or corrosion. The steel wire rope must not be rusted, damaged, bent, looped, twisted, cracked or loose;

4. The coordinate position, elevation, span length and flatness of the ground surface of commonly used general crane ground track foundations, crane beams and embedded parts should all meet the design and installation requirements;

5. Before rail auxiliary installation, the end face, straightness and distortion of the rails should be inspected and laid only after they are qualified.

 

Delivery and acceptance of 25 ton general purpose crane after installation

1. What are the requirements for inspection before operating a general-purpose crane?

 

① The installation of electrical systems, interlocking devices, brakes, controllers, lighting and signaling systems should meet the requirements, be sensitive and accurate.

 

② The fixation of the wire rope end and its winding on the hook, fetching device, pulley block and drum should be correct and reliable.

 

③The performance, specifications and quantity of oil and grease added to each lubrication point and reducer should comply with the provisions of the technical documents

 

④ When turning the brake wheels of each movement mechanism, the last axis in the rotating system (wheel axis, reel axis, vertical feeding rod, etc.) can rotate for one revolution without any blockage.

 

2. Which of the following requirements are met for the no-load test operation of general-purpose cranes?

 

①The operating direction of the control mechanism should be consistent with the operating direction of each mechanism of the general crane.

 

② Start the motors of each mechanism separately, and their operation should be normal. The cart and trolley should not get stuck when running; each brake should be accurate and reliable.

 

③When the hook is lowered to the low position, the number of turns of the wire rope on the drum should not be less than 2 turns (except the fixed circle)

 

④ When using cables to conduct electricity, the speed of unwinding and retracting the cable should be coordinated with the speed of the corresponding mechanism and should be able to meet the requirements of the work.

 

⑤The rail clamps, brakes, windproof and anti-skid anchoring devices and cart anti-deflection devices of 25 ton universal cranes and loading and unloading bridges should operate accurately and reliably; the anti-collision devices, buffers and other devices of universal cranes should work reliably.

 

⑥Except for item ⑤, which can be tested once or twice, all other tests should be conducted no less than five times, and the movements should be accurate.

 

 

The static load test of general cranes meets the requirements as follows:

 

1. The general purpose crane should be parked at the pillars of the workshop.

 

2. For a 25 ton general-purpose crane with multiple lifting mechanisms, each lifting mechanism should first be subjected to a static load test separately; if required, a static load test for joint lifting of the lifting mechanisms should be carried out; the lifting capacity should comply with the technical documents. Regulation.

 

3. The static load test should be carried out according to the following procedures and requirements: first start the lifting mechanism, perform no-load lifting operation, and make the trolley run back and forth on the full stroke. This no-load operation should be no less than three times, and there should be no abnormal phenomena.