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Safety monitoring and management system of portal crane

Time:2015-06-15 03:51 Read:17103 Source:Internet
Portal crane is a jib type crane whose bridge is supported on the ground rail or foundation through two side legs. Portal crane is widely used in port, dock cargo handling, shipyard construction and installation and large hydropower station construction projects. The rotating mechanism of the crane is installed on the frame of the gantry crane. The gantry frame is actually the bearing part of the crane. There is a running mechanism under the gantry frame, which can walk on the track set on the ground. The boom of the lifting mechanism and the luffing mechanism are also installed on the rotating mechanism. The four organizations work together to complete the installation of equipment or hull sections, or carry out cargo loading and unloading operations.
According to the national standard of safety monitoring and management system for lifting appliances (GB / T 28264-2012), the composition, system monitoring, system performance requirements, test methods and system inspection of the safety monitoring and management system for lifting machinery are specified. This standard is applicable to bridge cranes, gantry cranes, mobile cranes, tower cranes, portal cranes, cable cranes, mast cranes, bridge erecting machines and ship lifts specified in GB / T 20776. Other types of cranes can be used by reference.
Applicable specifications
Gb12602-1990 safety technical code for overload protection device of hoisting machinery
Gb6067.1 safety regulations for lifting machinery
GB / T 28264-2012 safety monitoring and management system for hoisting machinery
GB / T 20776 classification of hoisting machinery



Moment limiter of portal crane
When the crane is working, it is necessary to frequently change the working conditions according to the actual situation on the site, such as changing the lifting angle (amplitude) and the length of the lifting arm. However, the maximum rated lifting capacity and the maximum and minimum operating amplitude that can be lifted under different working conditions are different. Therefore, a set of devices is required to comprehensively monitor and judge the above parameters, and make a judgment on the normal operation, full load, overload, and amplitude exceeding the upper limit of the crane Indication and control of amplitude exceeding the lower limit.
The torque limiter is applied to the safety protection device of lifting machinery according to the above requirements to realize the real-time monitoring of various working parameters of lifting machinery, so as to protect the safety of lifting machinery and operators.
General portal crane is recommended to be equipped with wtl-a (200) torque limiter
Wtl-a200 torque limiter is mainly used for the monitoring of less than two weight signals and one angle signal (or one weight signal, one angle signal and one length measurement), and can be used for lifting equipment with more monitoring signals such as truck crane, crawler crane, portal crane and port crane.
Typical application diagram of moment limiter of portal crane



Solution for safety monitoring system of portal crane

Current status of equipment
Some old equipment adopts traditional logic circuit, most of the new door base machines adopt PLC control circuit, and some door base machines have preliminary COMS management system with insufficient storage capacity.
The mixing of the electromechanical control system of the gate seat leads to the increase of the adaptability of the hardware and software of the safety monitoring system, which brings certain difficulties to the research and development, production and installation of the safety monitoring system. Therefore, it is a difficult point to collect the operation instructions in the safety monitoring system.

Solution:
It is a problem faced by each safety monitoring system provider to propose different safety monitoring system configuration schemes for door base machines with different electrical control schemes.
1. Electrical transformation without PLC loop: the original logic circuit is transformed by PLC controller, or the action point signals to be monitored in the electrical circuit are collected point by point.
2. If there is a PLC control circuit, the information of the IO point of the PLC system is read through communication, and the action point signal to be monitored is collected.
3. If there is a COMS monitoring system, it is only necessary to compare the two systems, add the missing parts and meet the requirements of the monitoring system.

Portal crane System design drawing of safety monitoring system


Portal crane System composition / installation legend / platform features of safety monitoring system



Practical application cases

Changsha Xingang


Yangzhou Ocean International Wharf

Host instrument of 63T portal crane safety monitoring system wtsm-a monitoring system of Fujian Datang International Ningde Power Generation Co., Ltd



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