Introduction of hook bridge crane and its hook

What is hook bridge crane?

Hook bridge crane belongs to general-purpose overhead crane. It composed of lifting trolley, crane span structure, traveling mechanism and electrical control equipment, etc. According to the use environment, the location of driver chamber can be fixed at both sides of the bridge, in the middle of the bridge, or move with the lifting trolley. Hook bridge crane can be widely used in various of fields such as metalworking workshop, assembling workshop, maintenance workshop, steel structure workshop and warehouse, metallurgy and foundry workshop for auxiliary lifting, etc, if the crane can be designed let neither wind nor rain penetrate, it can also be used in the open spaces. This series of crane using three-phase 380 v, 50 Hz power supply, working environment temperature is from - 20 ℃ to 40 ℃, relative humidity ≤85%, elevation ≤1000m.

China hook bridge crane current situation

According to the requirements of operation safety and reliability, all mechanisms of the hook bridge crane have brake and stroke end limit switch. The power source of lifting trolley is supplied by suspension flexible cable, which was installed on the walking board. t, the lifting weight of standard hook bridge crane in China is generally ranging from 5t to 250t. They respectively belong to two series: 5 ~ 63 / 12.5t belongs to medium and small lifting series, while 80/20 ~ 250v / 50t belongs to the large crane series, and among them those cranes whose capacity are more than 15t have both the main and deputy sets of lifting mechanism. In order to give full play to the economic efficiency of crane, the weight of deputy hook lifting (denominator digital) usually takes about 20% of the main hook lifting weight. The standard span of electric double beam bridge crane is 10.5 ~ 31.5 m, and it can be divided into four types, light level, intermediate level, heavy duty level, and overweight level.

Hook bridge crane technical requirements

1.The assembling and test of crane shall comply with the provisions of GB14405-93.
2.Control room can be divided into four types, open control room, closed control room, insulation (P-4 chillers) control room, and insulation (air conditioning) control room. Platform entrance of the control room can be divided into three kinds, flank, end face, and top surface.
3.Main lifting mechanism hook can be divided into single hook and double hook.
4. The trolley buffer shall increase the height.
5.During the installation of crane, the welding and installation must be according to the provisions of the additional figure.

Bridge crane hook technical requirements and daily inspection measures

 
1.The center of the hook lock chamber must be consistent with the center line of the upper valve stem, and the deviation is not more than 2 mm.
2.Hook surface should be smooth without burrs, sharp corners, cracks, folds and other defect as well as the repaired defect.
3.When the abrasion of the hook lock chamber is more than 5 mm, it must be replaced with new ones.
4.The on-load test for hook of a new crane must be 2.5times of the rated load, load time is 10 minutes. After unloading check for cracks, the hook must be subjected to flaw detection, and it can be used only after passing inspection.
5.The joint of hook rod threaded and the nut must be firm, insurance should be reliable. And if the joint be found loose, replace the corresponding immediately.
6.Hook crosshead, socket bearing chamber, screw thread, diameter of axle and some other components are the places where the stress concentrates on and prone to crack. Only after passing the inspection can hook of crane put into use.
7.The hook must be adjusted to flaw detection during his maintenance, and in can be used continuously after it is qualified.
8.A new hook must be forged with 20# steel and be treated by the method of quenching after forging processing.

The use of crane hook

1.The load should be in the middle of the hook site during lifting load.
2.When start to lift the weight should be steady as possible as it can be to avoid the shock loads.
3.The surface of the hook should keep clean without flake, acute, burrs, cracks, etc.
The check of the hook

Inspection of crane hook

1.The check of the crane hook includes routine inspection and periodic inspection.
2.The routine inspection is responsible by the using department. The mechanical driver should deal with the hook inspection when shift changes, record the inspection results on the running log, and the using department should check the hook during weekly inspection. The examination content is give priority to the appearance inspection, mainly includes:
1.If there are crack, flake and deformation on the hook appearance.
2. Whether the card board is safe and effective.
3. Whether each bolt has looseness.
4.The pulley and bearing whether rotate flexible.
5.If all the lubricating points are in good lubrication.
6.If there are any other anomalies.
7.Look the opening degree and torsion resistance of the hook, and test the condition by instrument if any abnormalities were found