Gantry crane design calculations

Container gantry cranes fault diagnosis technology developme

• With the development of mature and advanced electronic technology and microelectronics technology state detection and fault diagnosis of various types of double girder bridge cranes, now specifically limit switch fault diagnosis system has developed from the previous simple fault detection method-the relays, contactors auxiliary chain connectors and indicators. Especially in the modern port for container gantry crane, each year automated material handling systems with improved performance come up in the crane market, as a result the complexity of lifting machinery increases.

• In order to improve the efficiency and reliability of crane machinery, improvements has been made in the maintenance and effective utilization, one key purpose is to reduce the rate of lifting machinery downtime to a minimum level. During the past 10 years, domestic and abroad crane designers continue to develop and apply the RAS port handling systems (reliability, effective utilization, easy maintenance). In the crane motor control systems, mobile crane 500 ton programmable logic controller (PC), data transmission device and velocity modulation components use monitoring software reliability and diagnostic measures. In the system design, set back-up facilities and specialized monitoring diagnostic equipment.

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• Container gantry cranes fault diagnostic testing device uses a microprocessor for the collection and processing of data, to achieve the lifting equipment and wiring fault detection, diagnosis and management of work records. Loading bridge microcomputers and computer in the control room via fiber optic cable to connect, can easily transfer communicate information and instructions. MCMS systems often detect the working state of electrical transmission line, and record digital analog signals and switches recorded and compare the detected values with normal values to determine whether there is a fault, if a fault occurs, it is displayed on the cab CRT. After the failure, it rapidly detect the fault location.

Gantry crane collision buffer selection and design calculation

• Collision buffer is a safety device gantry crane , the crane and its role is to reduce the running track at the end of sino hoist the end to end collision the impact of ending the red block , absorb impact energy , reducing the extent of crane steel structure and mechanical transmission component damage and protect gantry crane safety. Railway yard gantry cranes commonly used rubber buffers , shock caused damage have occurred , so the selection is very important buffer. In this paper, the calculation used to determine the gantry crane collision buffer selection problem. Collision buffer types and characteristics of the crash cushion is currently used in the field in general there are several types of rubber buffers, buffer springs and hydraulic buffers. The structure and characteristics of various buffers different conditions used have a hoist gantry crane greater difference. Rubber bumper rubber bumper structure shown in Figure 1a, the main components of a rubber cylinder , the bottom one step with the installation coupling hole . Rubber buffer buffering capacity is small, pillar slewing jib crane can suck ineffective , generally apply only to operating speed does not exceed 0.9m / s working conditions. In addition, the rubber bumper on the operating ambient temperature also have certain requirements , generally between -30 ℃ ~ 50 ℃, the temperature is too high or too low, it will seriously affect the performance of the buffer.