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What is the function of construction lift?
Construction lifts are commonly referred to as construction lifts, but construction lifts include a broader definition, and construction platforms also belong to the construction lift family. Simple construction elevator by car, drive mechanism, standard section, accessories, chassis, fence, electrical system and other parts, is commonly used in the construction of manned goods construction machinery, with China's production of construction elevator gradually mature, gradually towards the international. What is the function of construction lift? Construction lift, also known as construction lift, can be outdoor lift or site lift cage. Commonly used in construction of manned cargo construction machine, mainly used in high-rise building decoration, Bridges, chimneys and other building construction. The unique box structure makes it easy and safe for construction workers to ride. Construction lifts are usually used in conjunction with pylons on the site. General construction lift load is 1-10 tons, with 1-60m/min speed operation. There are many kinds of construction lifts, according to the operation mode: two pairs of weight. According to the control method, it can be divided into manual control and automatic control. Frequency conversion equipment and PLC control module can be added as required, floor calling equipment and layer equipment can also be added. What are the main features of construction lifts? High safety factor Standard section section Murake design to prevent cage from falling off the roof, limit and limit switch, drop safety device installation can ensure the safety of the construction personnel. Drive system Reduce the noise in the cage, increase the available space in the cage, at the same time make the transmission more stable, reduce the vibration of the mechanism. Convenient for multi-purpose use The traditional construction lifts are equipped with reinforced transport devices and concrete transport devices to transport reinforcement, concrete and construction personnel, greatly improving the construction efficiency. Optional advanced unpaid frequency control system, adjustable unpaid speeds from 0 to 96m/min. The connection system Through a variety of attachment systems, it can be used in complex and diverse buildings.
2022
01-12
Classification of tower cranes
Tower crane is a commonly used lifting equipment on the construction site, also known as "tower crane", with a section of the length (high) (referred to as "standard section"), used to lift the construction of steel bar, wood, concrete, steel pipe and other construction raw materials. Tower crane is an indispensable equipment in construction site. Classification of tower cranes: I. According to whether there is walking mechanism A It can be divided into mobile tower crane and fixed tower crane. Mobile tower crane can be divided into rail type, wheel type, car type and caterpillar type according to the different walking device. The rail type tower crane is fixed on the walking bottom frame, which can run on the specially set track. It has good stability, can walk with load, and has high working efficiency, so it is widely used in construction and installation projects. Wheel type, automobile type and crawler type tower crane have no track device, easy to move, but can not carry the load to walk, poor stability. Fixed tower crane according to the installation position of the different, and divided into two kinds of attachment jack-up and climbing, attached jack-up tower crane can rise with the building, suitable for high-rise buildings, the building structure only bear the horizontal load from the tower crane, easy to attach, but occupy the structure with more steel; The inner climbing tower is hoisted in the inside of the building (elevator shaft, stairwell) with the help of a set of brackets and lifting system. The lifting is more complicated, but the steel occupation of the structure is less, so there is no need to install the foundation, and all the dead weight and load are borne by the building. Two, the structural characteristics of the boom It can be divided into pitching hoisting boom (boom) and trolley hoisting boom (flat boom) tower crane. The luffing boom tower crane does not realize luffing by lifting the boom. Its advantages are: it can give full play to the effective height of the boom, and the mechanism is simple. The disadvantage is that the minimum amplitude is limited to about 30% of the maximum amplitude, which cannot be completely close to the tower body. The trolley variable amplitude crane tower crane is realized by walking the trolley installed on the horizontal crane track. Its advantages are: large amplitude range, the trolley can drive close to the tower, and can carry the load variable amplitude. Its disadvantages are: The crane boom has complex stress and high requirements for structure, and the crane boom and trolley must be in the upper part of the building, and the spire installation height is 15-20 meters higher than the building roof. Three, tower structure rotation mode It can be divided into lower rotation (tower rotation) and upper rotation (tower rotation) tower crane. The main mechanism of slewing bearing and balance weight is set at the lower end of the tower crane. Its advantages are: the tower is subjected to less bending moment, low center of gravity, good stability and convenient installation and maintenance. The disadvantage is that the slewing bearing is required to be higher and the installation height is limited. Rotary tower crane will swing support, balance weight, the main mechanism are set in the upper end, its advantage is that because the tower body does not swing, can simplify the lower structure of the tower body, lifting and adding joints is convenient. Disadvantages are: when the building exceeds the height of the tower, due to the influence of the balance arm, the rotation of the tower crane is limited, and the center of gravity is higher, the wind pressure increases, the pressure weight increases, so that the total weight of the whole machine increases. 4. Different installation methods of tower cranes It can be divided into the tower crane which can be folded and transported and set up as a whole by itself and the tower crane which needs to be assembled and disassembled by auxiliary machine. Self-erection of quick-loading tower cranes are small and medium-sized rotary tower cranes, mainly used for short construction period, the requirements of frequent movement of low-rise buildings, the main advantage is to improve work efficiency, save installation costs, save time, save labor and save materials, the disadvantage is complex structure, large maintenance. The tower crane, which needs to be disassembled by auxiliary machine, is mainly used in middle and high-rise buildings and places with large working range and large lifting weight, and is the main machine type on construction sites.
What should be paid attention to when using the lift
Lift in many industries will be used, whether it is any mechanical equipment, in the use of time to ensure the stability of the machine, if the lift is not stable, it is prone to failure or safety problems, so the lift in the process of use what details can not be ignored? 1, to understand the operation of the mechanism, mainly to see whether it is normal, there is no noise in the process of use, when found fault, need to be eliminated in time, so as to ensure the normal operation and use of the machine. Usually in the installation of the need to disassemble or adjust the rotary mechanism, in this case, to ensure that the rotary mechanism in the center line of the reducer and gear center line can be parallel, of course, the meshing gap should be appropriate. If this is not appropriate, then the machine will not work properly. 2, in the use of lift, the use of the process to check the connection of each part, when there is loose, to tighten in time. All the connecting shafts need to use cotter pins, in order to be able to fully open, and then can be better used.
Lifting platform maintenance method
the platform car work must be configured with professional drivers, operators, and through special training, and passed the examination, with the certificate; According to the actual situation of the work, the above-mentioned personnel may hold concurrent positions with each other, but the concurrent personnel must have the concurrent job certificate, and be approved by the competent leader, and assume corresponding responsibilities. After the completion of construction, it is necessary to move the platform car on the site, and the professional driver should operate the platform car.
Analysis of China aerial working equipment industry
China's aerial working machinery production enterprises started in the 1970s, has a history of more than 30 years. So far, the domestic high-altitude machinery manufacturers have developed from 7 or 8 at that time to more than 100, among which there are 4 joint ventures or cooperative production enterprises with foreign countries. Several industry backbone enterprises by the technical innovation of recent years, the production scale expands unceasingly, has formed a series of distinctive products, the main economic indicators of enterprises gradually rise, economic efficiency is also increased year by year, basic can satisfy domestic market requirement of small and medium-sized aerial work machinery, and some products are exported. According to the preliminary statistics of the member units of the association, the output of China's aerial work platform in 2005 was 1734, and 150 were exported. In 2006, it was 1,890 units and 290 units were exported. In 2005, 672 sets of aerial work vehicles were produced, and 20 were exported. In 2006, it was 778, 69 of which were exported. The total output value of aerial work machinery industry is 268.22 million yuan in 2005 and 326 million yuan in 2006. Output value of output in the first half of 2007, export volume was close to 2006 total. Although the development of domestic aerial work machinery in recent years is very fast, but the development of enterprises is very unbalanced, there is a big gap between enterprises, therefore, the status quo of the industry and the development of the product analysis and discussion has a very important significance.
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