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the SCM-QTD400 boom-type tower crane, which fills the gap between large and medium-sized boom-type tower cranes in China.The maximum boom length of the aircraft is 60m, the maximum lifting capacity is 20t, and the end lifting weight is 5t. It is the largest type of boom-type tower crane in China. This machine is novel in design and has a tower body structure. Lifting, slewing, luffing and walking mechanisms adopt advanced foreign technology, with the advantages of variable amplitude, accurate positioning and reliable performance. It is particularly suitable for crowded commercial areas, tower buildings and construction sites with narrow construction areas.

Construction Lift Construction elevator is usually called construction elevator, but the definition of construction elevator is broader, and construction platform belongs to construction elevator series. Simple construction elevator is composed of sedan car, driving mechanism, standard section, attached wall, chassis, fence, electrical system and other parts. It is often used in the construction of manned cargo construction machinery. Because of its unique box structure, it is comfortable and safe to ride. Construction elevator is usually used with tower crane on the construction site, with a general load of 0.3-3.6 tons and a running speed of 1-9 tons. 6 M/min. Type SC200/200 Main features: 1. Protective devices are complete and advanced, equipped with national patented anti-falling safety devices, whose reliability ranks first among similar products. 2. The driving unit is placed on the top of the cage, which has a large bearing space. 3. Three-drive structure is adopted, which has a large load capacity. 4. The attachment device is stable, safe and reliable. 5. It covers an area of only 24 square meters. 6. Smooth transmission, small vibration and comfortable ride. 7. Lightweight structure, easy maintenance and disassembly. 8. The transmission mechanism is driven by three motors, so that the force on the racks and gears is uniform and safe. 9. To ensure the safe operation of the elevator, overload, speed limit and other safety switches are set in the circuit. When the above-mentioned situation occurs in operation, the elevator will automatically avoid accidents. Limit switches are also available for all doors on the suspension cage. When any door is abnormally opened, the suspension cage can not start or stop operation immediately. 10. Each cage is equipped with anti-falling safety device, which can effectively prevent the cage from falling and ensure the safe and reliable operation of the elevator. 11. Elevator electric control system circuit is simple, easy to operate and maintain, and reliable. When the elevator is in normal operation, it can operate the elevator with a handle or button in the suspension cage. It can stop at any place where it needs to stop. In the upper and lower terminal stations, the upper and lower terminal limit switches control the automatic stop. If the upper and lower terminal limit switches fail to function, the limit switches set on the elevator can cut off the power supply in time to make them brake. 12. After scientific and rigorous calculation, the steel structure design meets the requirements of reasonable structure, reliable strength and light weight. 13. The lifts can install or disassemble the guideway frame by themselves using the suspenders on the suspension cage. The rest of the parts can be easily installed and disassembled, and parts can be easily replaced.

Main points of tower crane operation 1. Before tower crane operation, the following inspection and commissioning should be carried out: (1) track foundation should be straight without subsidence, joint connection bolts and track nails should not be loosened; (2) safety devices, transmission devices, indicators, main parts of connection bolts, wire rope wear, power supply cables and so on must comply with relevant regulations; (3) according to relevant regulations. Conduct test and commissioning. 2. When there are more than two cranes in the same construction site, the distance between the two cranes should not be less than 2m. 3. Before the hoisting hook, lifting trolley or traveling cart run to the limit device, they should slow down to the stop position and keep a certain distance from the limit device (the hook shall not be less than 1m, and the traveling wheel shall not be less than 2m). It is strictly forbidden to use the limit device as the control switch for stopping operation. 4. Lifting, turning and walking of boom crane can be carried out at the same time, and amplitude variation should be carried out separately. After each amplitude change, the location of the amplitude change should be checked. When the load reaches 90% or more of the rated lifting weight, it is strictly forbidden to change the load amplitude. 5. Lift heavy objects and prohibit free descent. When the weight is in place, slow positioning mechanism or brake can be used to slow down the weight. 6. When lifting a heavy object to move horizontally, it should be over 0.5m higher than the obstacles it crosses. 7. Cranes equipped with upper and lower control systems shall not be used at the same time. 8. In case of Gale or gust above grade 6, the operation should be stopped immediately, the rail clamp should be locked, the brake of the rotary mechanism should be completely loosened, and the lifting arm should be able to rotate with the wind. For light pitching luffing crane, the lifting arm should be lowered and locked together with the tower body structure. 9. In operation, when the operator leaves the control room temporarily, he must cut off the power supply and lock the rail clamp. 10. It is strictly forbidden for cranes to overload when loading special elevators. The rope breaking protection device must be reliable. When the crane is working, it is strictly forbidden to start the elevator. When the elevator is out of service, it should be lowered to the bottom of the tower body and not suspended in the air for a long time.