General description

QZ Overhead crane with grab is widely used in loading goods in port,factory,workshop, power plant, steel melting plant,cement plant,waste renewable energy industry.

The working duty is heavy.The group classification of the crane is A6.

The direction of platform door to the driver's cap is:side,end and top.

The lifting capacity includes the weight of the grab.

The open direction of the grab includes paralleling with the beam and plumbing with the beam,this design is the plumbing type.

The grab overhead crane includes main beam, lifting trolley, wheel, hook, pulley, electrics, grab.

 

Mechanical parts

Double welding box girder, beam deflection with DIN/FEM standard

Steel Material: Chinese standard Q235B and Q345B

Trolley rail is made of high strength hot rolled flat steel (16 Mn)

Epoxy zinc-rich painting for one bottoms and two sides of 120μm thick, to achieve a long lifespan, beautiful appearance and good luster

The girder and end beam are connected together by high strength bolts to ensure the structure strength and precision of the whole machine
The end beams are equipped with flat wheel or double rim wheels, anti-friction bearings, buffer blocks and derailment preventing end plate
Maintenance walkway is located on one side of the main girder, consisting of flower pattern plate, 1050meters handrail.

1. Both side of all the steel plate of crane are pretreatment by pretreatment production line,

Sand blasting-- Primer spray--Primer drying. Eliminate the innerstress of steel plate, increase the adhesive force of the steel structure. Ensure the appearance and anticorrosion quality.

 

2. Steel plate cutting adapt whole sets Messer CNC plasma cutting machine from Germany, vrey fast cutting speed, little deformation, High precision,  Deviation could be controled within 1mm, it insure the raw material at high quality standard and can reach top level in the industry.

 

3. The welding of main beam adapt high efficiency and intelligent welding robot, Weihua are No.1 enterprise who adapt this high technology machine. The welding joint inside of the main beam adapt advanced MAG welding, adapt Ar+CO₂ mixed protective gas, The 4 welding joint outside of the main beam adapt automatic submerged-arc fillet welding machine.

4. The welding of main beam adapt radiographic inspection and ultrasonic flaw detection for the welding joint and fillet weld position.

 

5. The welding of end beam adapt double gun gantry submerged arc welding, highly welding quality ensure the stable quality of the crane effectively.

 

6. Adapt the steel plate rolling drum and wireless steel tube, Weihua has a set of steel plate rolling drum producing and processing line which is indusrty-leading level. From prebending by 1250t press machine, to Edge rolling by three-roller plate roll, at last the longitudinal joint and circumferential joint of drum are welded by automatic welding center and drum processed by heany duty CNC horizontal machine tool.

7. The wheel and wheel axle and treating by high efficiency quenching and tempering, it can eliminate the internal stress effectively and ensure the processing precision,

 

The trolley frame, drum, and bogie frame and related big welding structure are treated by Annealing in the natural gas annealing furnace to ensure the Machining accuracy after welding. Weihua have car bottom  natural gas annealing furnace, the furnace chamber inside size (length*width*heigh) is 10000mmx4000mmx4000mm, this annealing furnace can satisfy the Stress-Relieving annealing treatment after welding for the trolley frame, drum, bogie frame, balance beam, spreader and all kinds of welding structure on the crane, Only Weihua has this ability in China Crane Hometown.

8. According to the demand of customer, our crane could be equipped with the high technology anti-swing mechanism which has been apply as the patent of our Weihua group. This is work leading level technology. Weihua take the head in achieve the best and better management, best and better manufacturing, promote the further enhance for the product quality.

 

 

9. Weihua has top advanced processing and manufacturing equipment and processing technology in the crane industry all over China, at the same time, Weihua take the head in achieve the best and better management, best and better manufacturing, Try the best to ensure the Weihua product quality and satisfy the demand of customer.

Electrics parts

 

Hoist lifting, trolley and crane movements are controlled separately. They can run and lifting simultaneously or independently.

Specialized vibration control contactor for crane

The control panels are corrosion resistant, protection class is IP55

All the plug sockets are with heavy duty plug heads, reliable sealing and firm inserting

The layout of components in the control box is reasonable, easy to check and maintenance

Plug connection parts are protected by insulating plastic casing, very safety,

All cables are coded with numbers, easy to identify and final installation.

Power supply for crane long travelling include Bus bar(Slide wire) with suitable current collector.

The power supply system for trolley consists of insulated PVC flat cable, galvanized U type steel and small cable trolley to achieve smooth sliding

Equipped with protection function in case of default phase

 

Lifting Mechanism

Heavy duty trolley as lifting mechanism which can reach M8 working grade,

 

Safety protection system

 

a.     {C}Overload protection in the event of overload, the hoist unit switches off and only the lowering motion is possible

b.    {C}Long and cross travel limited by means of preliminary and final limit switches or Wireless anti-collision device

c.     {C}Anti-falling protection for the Three-in-One electric motor of trolley and crane prevents from accidental falling

d.    {C}All movements can be switched off by actuating the emergency-off switch at the control station via a main contact

e.    {C}High quality long time bearing polyurethane materials buffer fixed at the end of trolley travelling and crane travelling to prevent over traveling

f.     {C}Safety hook latch used for avoiding the lifted material out off from the hook

g.    {C}Audible and visual alarm device to inform the person stay near by the travelling crane.

h.    {C}Rain Cover for lifting mechanism of outdoor cranes, electric cabinet and driving mechanism

i.      {C}{C}Protective earth conductor is fitted as standard

j.      {C}{C}Voltage lower protection system

k.    {C}{C}Current overload protection system

 

Control way:

 

Pendent line control

a.     {C}36V control voltage safety for human being.

b.    {C}Easy to control, no additional driver necessary, operate following the travelling of crane and hoist

c.     {C}Double step button with emergency to achieve safety stop

d.    {C}Connected with the electric trolley suspended under trolley

e.    {C}Protection class IP65

f.     {C}Operation life not less than 500,000 times

 

Remote control

a.     {C}Taiwan Yuding or world famous brand,

b.    {C}24V control voltage safety for human being.

c.     {C}Remote distance: not less than 100meters,

d.    {C}Easy to control, no additional driver necessary, to operate more freely on the ground

e.    {C}Tens thousands of connection frequency points, non-interference with each other

f.     {C}Two steps push button or joystick station with emergency stop.

g.    {C}Protection class IP65

h.    {C}Operation life: not less than 500,000 times

 

Cabin control

a.     {C}Control by Linkage platform with joystick station, easy to operate for driver

b.    {C}Master Controller with Push Button for ON, OFF, UP, DOWN, Forward, Reverse, Left, Right, Bridge Light & Emergency Stop

c.     {C}Professional driving chairs, adjustable and fully turning

d.    {C}Round window with large arc glass, wide field view,

e.    {C}Made by our group, equipped with air-conditioning