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Feature: Bridge Crane
After-sales Service Provided: Engineers available to service machinery overseas
Warranty: 1 year
Certification: CE. ISO etc
Model Number: lda
Brand Name: weihua
Place of Origin: China (Mainland)
Span: 3m~16.5m
Max. Lifting Height: 20m
Max. Lifting Load: 20ton
Rated Loading Capacity: 20ton
Application: indoor,workshop, warehouse
Condition: New

Specifications

LDA model single girder overhead crane is a kind of light duty crane, with a capacity of 1 to 20 tons. The span is 7.5to 31.5 meters. Working grade is A3. Working temperature is -25°C to 40°C.
It is widely used in plants, warehouse, and material stocks to lift goods.
It is matched with electric hoist which is CD model or MD model.
It is prohibited to use the equipment in the combustible, explosive or corrosives environment.
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, very fast cutting speed, little deformation, High precision,  Deviation could be controlled 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 industry-leading level. From pre-bending 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 heavy 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.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. 
Safety protection system
a. Overload protection in the event of overload, the hoist unit switches off and only the lowering motion is possible 
b. Long and cross travel limited by means of preliminary and final limit switches or Wireless anti-collision device 
c. Anti-falling protection for the Three-in-One electric motor of trolley and crane prevents from accidental falling 
d. All movements can be switched off by actuating the emergency-off switch at the control station via a main contact
e. High quality long time bearing polyurethane materials buffer fixed at the end of trolley travelling and crane travelling to prevent over traveling 
f. Safety hook latch used for avoiding the lifted material out off from the hook
g. Audible and visual alarm device to inform the person stay near by the travelling crane.
h. Rain Cover for lifting mechanism of outdoor cranes, electric cabinet and driving mechanism
i. Protective earth conductor is fitted as standard
j. Voltage lower protection system
k. Current overload protection system
Control way: 
Pendent line control
a. 36V control voltage safety for human being. 
b. Easy to control, no additional driver necessary, operate following the travelling of crane and hoist
c. Double step button with emergency to achieve safety stop
d. Connected with the electric trolley suspended under trolley
e. Protection class IP65
f. Operation life not less than 500,000 times
Remote control
a. Taiwan Yuding or world famous brand, 
b. 24V control voltage safety for human being. 
c. Remote distance: not less than 100meters, 
d. Easy to control, no additional driver necessary, to operate more freely on the ground
e. Tens thousands of connection frequency points, non-interference with each other
f. Two steps push button or joystick station with emergency stop.
g. Protection class IP65
h. Operation life: not less than 500,000 times



Lifting capacity (T)

1,2,3,5,10T

16,20T

Span(M)

7.5-31.5M

Overhead Crane travelling mechanism

Travelling speed(m/min)

20

30

45

60

75

20

30

45

60

75

Reducer ratio

58.78

39.38

26.36

19.37

15.88

58.78

39.38

26.36

19.37

15.88

Motor

Model

ZDY21-4

ZDY21-4

ZDY122-4

ZDY131S-4

ZDY112L1-4

Power(kw)

2×0.8

2×1.5

1.5×2

2.2×2

2.2×2

Rotation (m/min)

1380

1380

Lifting mechanism

(electric hoist)&electric hoist travelling mechanism

Electric hoist model

CD1/MD1

MD1/HC

Lifting speed (m/min)

8,8/0.8 7,7/0.7

3.5 3.5/0.35

Lifting height (m)

6 ,9 ,12, 18, 24, 30

12,18,24,30

Travelling speed (m/min)

20(30)

20(30)

Motor

Taper Squirrel-cage type

Taper Squirrel-cage type

Work duty

A3-A5

Power supply

380V 50HZ three phase or according to your requirements

 

Safety bridge crane
  • Limit switch for lifting, cross traveling and long crane traveling .
  • Overload protect device: once overweight, stop working immediately.
  • Buffer: avoid collision.
  • Emergency stop switch: has the protection of any emergency.
     
Advantages bridge crane:
  • Good quality with competitive price
  • Reasonable structure, favorable performance
  • Control the load easily and position the load exactly
  • Smooth starting and stopping
  • Superior safety and reliability
  • Low noise, commodious cabin and good view
  • Low dead weight low your cost
  • Easy maintenance for parts