Electrically Operated Overhead Travelling Crane

Double girder electrically operated overhead travelling crane

 

Double girder electrically operated overhead travelling crane, mainly used in various indoor workshops. According to the different utilization grade and load state, it is divided into A5 and A6 two working levels.

 

Parameters:

 

Lifting capacity: refers to the mass of the lifted object, in kg or t. It can be divided into rated lifting capacity, maximum lifting capacity, total lifting capacity, effective lifting capacity, etc.

 

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

 

Working level: An indicator of the working status of the whole machine that indicates the full load level of the crane and the number of lifting operations. The working level of the crane is divided into 8 levels, A1-A8, light level (A1-A3), intermediate level (A4, A5), heavy grade (A6, A7) and extra heavy grade (A8).

 

Wheel pressure: The maximum vertical pressure exerted on the wheels of the cart by the bridge's own weight and the trolley's dead weight and rated lifting weight when the trolley is at the extreme position.

 

Bridge crane span: The distance between the two track center lines of the bridge crane's operating track is called the span of the crane.

 

Structure of bridge crane:

 

The bridge crane consists of a bridge frame, a trolley equipped with a lifting mechanism, a trolley driving mechanism and a control room.

 

1. The bridge frame is the basic component of the bridge crane, which is composed of main beam, end beam and other parts. That is, a big car.

 

The main beam spans the factory building and is connected at both ends with end beams. There is a walking platform and safety railings on the outside of the main beam.

 

The bridge is equipped with a cart driving mechanism, an electrical box, a lifting mechanism, a trolley running track and an auxiliary wire frame.

 

There are taxis at one end of the bridge. The other end has the main slide lead leading to the power supply.

 

2. The traveling mechanism of the cart is composed of drive motor, brake, transmission shaft, reducer, wheels and other parts.

 

There are two driving methods: centralized driving and shunt driving. At present, my country produces bridge cranes

 

Most of the machines use separate drives, which have the advantages of light weight, easy installation and maintenance. Driven by the trolley's traveling mechanism, the entire vehicle moves back and forth along the workshop. The trolley operating mechanism consists of a trolley frame, a trolley driving mechanism and a lifting mechanism.

 

3. The trolley frame is made of welded steel plates and is equipped with a trolley driving mechanism, lifting mechanism, railings and lifting limit switches.

 

3.1 The trolley can move left and right along the track on the main beam of the bridge. Buffers and limit switches are installed at both ends of the trolley in the running direction.

 

3.2 The driving mechanism of the trolley consists of motor, reducer, reel and brake. After decelerating, the motor drives the driving wheels to move the car.

 

3.3 The lifting mechanism consists of motor, reducer, reel, brake, etc. The lifting motor is connected to the reducer through the brake wheel and clutch, and the output shaft of the reducer is connected to the lifting drum.

 

4. The control room is the pod for operating the crane, also called the cab. The control room is equipped with large and small car traveling mechanism control devices, lifting mechanism control devices and crane protection devices. The control room is usually installed at one end of the main beam, and sometimes it is installed under the car and moves with the car. There is a hatch above the control room that leads to a walk-in platform for personnel to get on and off the trolley when servicing the trolley and the trolley's mechanical and electrical equipment.

 

5. Automobile conductive device (auxiliary slide wire)

 

6. Crane main power conductive device (main trimming line)

 

7. AC magnetic control box, resistance box

 

8. Orbit

 

How to operate the crane correctly to ensure construction safety?

A crane is a mechanical equipment used to carry and lift heavy objects. It is widely used in construction sites, docks, mines and other places. Correct operation of the crane is crucial to construction safety. The following are some basic points and precautions for operating the crane to ensure construction safety.

 

Before operating a crane, you must be familiar with the structure and working principles of the crane and undergo relevant training and qualifications. Untrained personnel are not allowed to operate the crane.

 

Before operating, the crane must be inspected and maintained to ensure it is in normal working order. This includes checking the working conditions of various parts such as wire ropes, hydraulic systems, and electrical systems. If any abnormalities are found, they must be repaired and replaced in time.

 

Before operating a crane, the job site must be assessed and prepared. This includes assessing the weight, shape and size of the lifted object, selecting the appropriate crane for the job, and clearing the work area to ensure it is clear of obstructions and personnel.

 

During crane operation, the operation manual and safety regulations must be strictly followed. The operator must clearly understand the functions of each control device of the crane and use them correctly.

 

When operating a crane, the designated signals and gestures must be strictly followed. The crane signalman must clearly understand the crane's signaling system and gestures, and cooperate with the operator tacitly.

 

When operating a crane, the operator must ensure that there are no people or obstacles around. Cranes will produce large swings and vibrations when working, and a safe distance must be maintained around them to prevent accidents.

 

When operating a crane, you must ensure that heavy objects are lifted securely and that correct lifting gear and safety devices are used. Spreaders must meet specified standards and undergo regular inspection and maintenance to ensure their reliability and safety.

 

During crane operation, safety inspections and maintenance must be carried out regularly. This includes checking the mechanical components, transmission and braking systems of the crane to ensure they are working properly.

 

When operating a crane, relevant safety regulations and operating instructions must be followed. Follow correct operating procedures and do not change operating methods and working methods without authorization.

 

During crane operation, you must remain alert and focused at all times, and pay attention to the surrounding environment and working conditions. If any abnormality is discovered, the operation must be stopped immediately and corresponding emergency measures must be taken.

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