Knowledge of lifting equipment

Release time:

14-06-26

The operation of the crane requires a wealth of experience in order to avoid unnecessary accidents. So some experience is very useful, the following is a summary of some experts crane common sense, I hope useful to everyone:

1. What are the main safety protection devices of the crane? Lifting limiter, stroke limiter, emergency switch and interlocking switch, buffer and terminal stop, sweeping rail board and sliding line protection board, sound and light signal, protective railing, grounding and zero connection, protective cover and protective device, etc.

2. Definition of Lifting Machinery Lifting machinery refers to mechanical and electrical equipment used for vertical lifting or vertical lifting and horizontal movement of heavy objects, and its scope is specified as lifts with rated lifting weight greater than or equal to 0.5t; Cranes with rated lifting weight greater than or equal to 1t and lifting height greater than or equal to 2m and electric hoists with fixed load-bearing forms, etc.

3. camber value formula: camber = span/1000. The resulting value is the camber.

4. Determine the cause of wheel rail gnawing and the elimination method:

(1) Rail gnawing caused by rail defect

(2) Rail gnawing caused by wheel defect

(3) Bridge deformation

(4) Bridge skew method when starting braking

(1) The deformation of the bridge can reduce the wheel span and diagonal error by adjusting the wheel position.

(2) If there is a problem with the track, the track should be corrected or replaced in time.

(3) Eliminate electrical faults and adjust the brakes on both sides to make the braking torque and the release time consistent

5. Try the working principle of the control loop to explain that the zero position protection of the crane is to prevent the sudden power failure when the main command handle of the crane console is working in the non-zero position (I. e. the working gear). the operator forgot to pull the handle back to the zero position when leaving the console. when the crane resumes power supply, the crane may start by itself. With zero protection, when the crane is accidentally powered off, the crane will not start on its own if the operating handle is not in zero position.

6. The contents of safety inspection in electrical safety work shall be set up at the entrance of the crane with an easy-to-operate main isolation switch, and the crane shall be set up with an emergency power-off switch, and check whether the total 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 protection, overcurrent protection and special crane overspeed and loss of excitation protection. Check the completeness and effectiveness of electrical interlocking, interlocking, self-locking and other protective devices. Check whether the insulation resistance of the electrical circuit, the grounding resistance of the electrical equipment and the grounding resistance of the metal structure meet the requirements. Reliable grounding (zero) protection shall be provided for metal shell, transformer core and metal isolation layer, threading metal pipe groove, cable metal sheath and metal structure of all electrical equipment on the crane. The above introduces the operation of lifting equipment common sense and experience, if you still don't understand can consult us.

Address (Add): Yuizhuang Industrial Zone, Changyuan County, Henan Province

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Henan Provincial Quality Supervision Bureau spot checks 1 batch of electric single-beam crane products that do not fit the standard (including the list of enterprises)

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