Basic knowledge of double girder bridge crane

First, the composition of the double girder bridge crane:

The outer image of the overhead crane is a single-span slab bridge supported by two ends supported on two parallel overhead rails. Double girder bridge cranes generally consist of three major parts: mechanical, electrical and metal structures.

1. Mechanical parts: three mechanisms: lifting mechanism, trolley running mechanism and cart running mechanism. The hoisting mechanism is used for vertical lifting and lowering, the trolley running mechanism is used for lateral movement with load; the trolley running mechanism is used for longitudinally moving the lifting trolley and articles to achieve handling and loading and unloading of goods in three-dimensional space. .

2. Metal structure: It consists of a bridge frame and a small frame.

3. Electrical part: It consists of electrical equipment and electrical circuits.

Second, the main technical performance parameters of the double girder bridge crane:

Lifting weight, lifting height, depth of depth, span, mechanism working speed, working level, and total crane weight or wheel pressure.

1. Lifting weight: The maximum lifting weight is allowed when the crane is working normally.

2. Lifting height: the distance between the upper limit position and the lower limit position of the spreader.

3. Span: the distance between the vertical centerlines of the wheels at both ends of the crane

4, the working speed of the organization (the fifth speed).

(1) Lifting speed: refers to the speed at which the pick-up device is fully loaded when the motor of the hoisting mechanism is at the rated speed.

(2) Running speed of the big car: refers to the running speed of the crane when the motor of the big car running mechanism is at the rated speed.

(3) Car running speed: It refers to the running speed of the lifting trolley when the motor of the trolley running mechanism is at the rated speed.

5. Working level: It indicates the full working degree of the crane lifting load and the busy working degree of the lifting work. The working level of the crane is divided into 8 levels of A1-A8, light (A1-A3), intermediate (A4, A5),Heavy (A6, A7) special grade (A8).

6. Wheel pressure: The maximum vertical pressure of the trolley's own weight and rated lifting weight on the cart wheel when the bridge's own weight and the trolley are in the extreme position.