Comparison of traditional KBK cranes and combined cranes
KBK is the general name of flexible beam crane, the lifting capacity is generally 2 tons, it is a kind of station crane design originated from Europe. KBK is composed of suspension device, track, turnout, walking trolley, electric hoist, mobile power supply device (slide line) and control device. It only needs to be hung on the roof of the workshop or on the beam frame to realize the direct transportation of materials in the air. Due to its early entry into the Chinese market, many domestic crane manufacturers have copied the KBK series of products so far. The quality of the products is uneven, and the structural specifications are also different to varying degrees.
The combined girder crane adopts a rigid structure design, which has obvious advantages over the KBK flexible girder crane:
1. Connection method of hanger and track
(1) The hanger of the combined crane adopts a rigid structure design, while the hanger structure of the flexible beam system is a ball-and-socket design, which makes the overall structure more flexible. However, this kind of flexible design has a greater risk of loosening, and regular maintenance and repairs need to be added;
(2) The track of the combined crane is integrated into the rail trolley, which almost eliminates the safety risk of loosening and falling due to long-term use. The track of the flexible beam system is clamped by a flexible hanger. There is a greater risk of bolt loosening after time.
2. On-site installation method
The combined crane provides a truss-type track design, which effectively reduces the number of lifting points during on-site installation, and the distance between each support center can be up to 9 meters; the flexible beam system is based on different lifting capacity, every 30 cm to 3 There must be a lifting point between the meters, which increases the difficulty and time of on-site installation, and requires relatively high construction requirements for future equipment maintenance and workshop renovation.
3. Span limitation of single main beam
The large span of the main beam of the combined crane can reach 9 meters, even when the lifting capacity reaches 2 tons, there is no need to consider the double main beam; however, when the lifting capacity of the flexible beam system is between 1-2 tons, as long as the lifting capacity exceeds 2 tons For a span of 4-6 meters, it is necessary to use double main beams, which will increase the difficulty of manual operation and positioning. It is even necessary to consider installing electric drives on the rails to avoid problems that may occur when the main beams run on the rails.
4. Steel structure auxiliary beam
The combined crane adopts a truss-type track design. Generally, there is no need to add additional steel structure as support during on-site installation; the KBK track of the flexible beam system must be installed under the additional steel structure to meet the requirements for auxiliary beams, and Compared with station cranes of the same specification, the appearance of combined cranes is more concise and beautiful;
5. Headroom
Because there is no need for additional steel structure as support, the headroom of the combined crane is much smaller than that required by the flexible beam system. Smaller headroom means more effective lifting space. For workshops with denser spaces, the headroom is often is the key factor.
6. Operation
For rigidly designed combined cranes, the main girder will not run skewed when running on the track; while the flexible girder system is characterized in that one section of the main girder will run ahead of the other (when the hoist trolley is not in the main section) In the case of the central position of the beam), the situation of skewed walking is formed, which is likely to lead to the situation that the rail trolley is stuck on the main beam.
The comparison and difference between traditional KBK cranes and combined cranes The above content has been briefly introduced to you. I believe you can have a good understanding of crane knowledge.
2. On-site installation method
The combined crane provides a truss-type track design, which effectively reduces the number of lifting points during on-site installation, and the distance between each support center can be up to 9 meters; the flexible beam system is based on different lifting capacity, every 30 cm to 3 There must be a lifting point between the meters, which increases the difficulty and time of on-site installation, and requires relatively high construction requirements for future equipment maintenance and workshop renovation.
3. Span limitation of single main beam
The large span of the main beam of the combined crane can reach 9 meters, even when the lifting capacity reaches 2 tons, there is no need to consider the double main beam; however, when the lifting capacity of the flexible beam system is between 1-2 tons, as long as the lifting capacity exceeds 2 tons For a span of 4-6 meters, it is necessary to use double main beams, which will increase the difficulty of manual operation and positioning. It is even necessary to consider installing electric drives on the rails to avoid problems that may occur when the main beams run on the rails.
4. Steel structure auxiliary beam
The combined crane adopts a truss-type track design. Generally, there is no need to add additional steel structure as support during on-site installation; the KBK track of the flexible beam system must be installed under the additional steel structure to meet the requirements for auxiliary beams, and Compared with station cranes of the same specification, the appearance of combined cranes is more concise and beautiful;
5. Headroom
Because there is no need for additional steel structure as support, the headroom of the combined crane is much smaller than that required by the flexible beam system. Smaller headroom means more effective lifting space. For workshops with denser spaces, the headroom is often is the key factor.
6. Operation
For rigidly designed combined cranes, the main girder will not run skewed when running on the track; while the flexible girder system is characterized in that one section of the main girder will run ahead of the other (when the hoist trolley is not in the main section) In the case of the central position of the beam), the situation of skewed walking is formed, which is likely to lead to the situation that the rail trolley is stuck on the main beam.
The comparison and difference between traditional KBK cranes and combined cranes The above content has been briefly introduced to you. I believe you can have a good understanding of crane knowledge.