20 Ton Overhead Crane
20 Ton Overhead Crane
BY Dongqi Crane IN Overhead Crane By Tons
20 ton Overhead Crane, a kind of heavy duty crane, is mainly used for lifting and transporting work in steel, metallurgy and building material industry. Dongqi Group, one of best lifting crane suppliers, provides various types of cranes with safety protection devices, especially for heavy duty cranes. Safety protection devices include limiting stopper, crane buffer, anti-collision device, anti-deflection device, overload limiter.
20t LH Double Girder Lifting Crane
- Lifting Capacity: 20t
- Span Length: 10.5~31.5m
- Lifting Height: 6~18m
- Working Class: A4
- Ambient Temperature: -20~40℃
QC 20T Electromagnetic Bridge Crane
- Lifting Capacity: 20t
- Span Length: 10.5~31.5m
- Lifting Height: 6~80m
- Lifting Speed: 7.8-15.5m/min
- Crane Speed: 42-112m/min
- Working Class: A6
Safety protection of limiting stopper on bridge cranes
Limiting stopper is a kind of protection device to limit the travelling area of mechanism. It includes two categories, one is the limiting stopper of rising extreme position and downing extreme position to protect lifting mechanism, and the other is limiting stopper of travelling extreme position to limit the travelling mechanism.
Dongqi 20t QD Dual Hook Bridge Crane
- Lifting Capacity: 20t
- Span Length: 10.5~31.5m
- Lifting Height: 6~18m
- Working Class: A5, A6
- Ambient Temperature: -20~40℃
QDY 20t Heavy Duty Foundry Crane
- Lifting Capacity: 20t
- Span Length: 10.5~31.5m
- Lifting Height: 6~35m
- Crane Dive:IP54 or IP44,level F insulation
- Working Class: A5 A6
Why crane system need buffers?
Three kinds of buffers are used widely, spring buffer, rubber buffer and hydraulic buffer. Spring buffer is reliable and convenient to maintain. Rubber buffer has simple structure. Hydraulic buffer can absorb large hitting energy and has no rebound effect.
When limiting stopper of travelling extreme position or brake is in trouble, due to the inertia, the crane system moving in the end or the trolley on the main girder, will hit against the stopper set in the position. But crane buffer can absorb the travelling energy of crane system or trolley and reduce impulsion. Buffers should be set between the bridge cranes travelling on the same track, or between the double trolleys on the same girder.
20t QE Double-trolley Lifting Crane
- Lifting Capacity: 20t
- Span Length: 6~40m
- Lifting Height: 3~60m
- Lifting Speed: 0.1-13m/min
- Working Class: A5 A6
Dongqi 20t QL Electromagnetic Crane
- Lifting Capacity: 1~350t
- Span Length: 6~45m
- Lifting Height: 3~60m
- Lifting Speed: 7.8-15.5m/min
- Crane Speed: 20-30m/min
- Working Class: A3-A7
The use of overload limiter on lifting crane
Overload can make harm to the crane system itself and endanger the operator, so the overload limited must be installed on hoisting cranes to ensure the crane safety. Overload limiter includes two types: automatic-stop type and ring-bell type
20t QZ Grab Overhead Crane from Dongqi
- Lifting Capacity: 5~20t
- Span Length: 10.5~31.5m
- Lifting Height: 6~18m
- Working Class: A5, A6
- Ambient Temperature: -20~40℃
The function of anti-collision device on cranes
It mainly includes laser type, ultrasonic type, infrared type, electromagnetic type, all use the principle that light or radio wave travels, reflects and the distance can be measured. When two overhead cranes travels to pointed position, the crane mechanism rings alarm bell and gives the stop command at the same time.
20t Dongqi YZ Foundry Heavy Duty Crane
- Lifting Capacity: 5~320t
- Span Length: 10.5~31.5m
- Lifting Height: 6~18m
- Working Class: A6, A7
- Ambient Temperature: -10~50℃
How does anti-deflection device protect cranes?
It includes wire-rope type, cam type, chain wheel type and skew indicator and other automatic adjustable devices. When the bridge frame deflects to some degree, it can give signal to the operator and adjust itself automatically. When the crane frame deflects seriously, it can cut the power automatically, stop the travelling mechanism and protect the safety.
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- Address: No.1, Weier Road, Henan (Changyuan) Crane Industry Park, China.
- Tel: +86-371-86687182
- Whatsapp: +86-15036177583
- Email: [email protected]
- Web: www.overhead-crane.org
