A system and method for abnormal pressure monitoring during pipe expansion

Abstract

A system for monitoring abnormal pressure in a tube expanding process comprises: a receiver with a pressure detection function, which is arranged at a bottom of a single U-shaped copper pipe and usedfor measuring a pressure value of the single U-shaped copper pipe; a signal processing module used for accurately amplifying output signals of a sensor and converting mechanical quantity into standardvoltage signals, and built in an industrial personal computer; an abnormal pressure identifying module used for identifying an abnormal pressure value of the single U-shaped copper pipe at a pressurepeak in the tube expanding process; and a failure alarm and visualization module used for displaying data and alarm; the receiver, the signal processing module, the abnormal pressure identifying module and the fault alarm and visualization module are connected in sequence by means of communication. By the system and the method of the present invention, real-time pressure monitoring of the singleU-shaped copper pipe is achieved when a stress form of the single U-shaped copper pipe is not changed, the monitoring effect is more accurate, a plurality of copper pipes can be monitored simultaneously, a product quality problem caused by failure to key parts of equipment is effectively prevented, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of intelligent equipment and technology, and more specifically relates to an abnormal pressure monitoring system and method used in the tube expansion process. Background technique [0002] In the air-conditioning industry, the main function of the tube expansion process is to realize the expansion of copper tubes. Through the expansion of the copper tubes, the copper tubes and the fins can achieve an interference fit, and the copper tubes and the fins are in full contact to realize heat dissipation from the copper tubes to the fins. The expansion process consists of three stages: [0003] 1) Expansion head expansion stage: realize the expansion of the expansion head in the copper tube. After the expansion head obtains downward pressure through the expansion rod, it gradually penetrates into the bottom of the copper tube to realize the expansion of the entire copper tube. At the same time as the expansion head expa...

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Problems solved by technology

The above experiments show that the abnormality of the size of the bell mouth can be indirectly monitored by monitoring the pressure in the bell mouth expansion stage. The existing tube expansion equipment can set and monitor the overall pressure during the tube expansion process in real time, but a process in production may contain hundreds of copper tubes. Corresponding to hundreds of expansion heads and expansion rods, it is necessary to be able to collect the pressure of a single U-shaped copper tube in order to achieve the purpose of abnormal pressure monitoring caused by failure of key components of the equipment

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