According to Article 7.6 of the national standard GB4351.1 Handheld Fire Extinguishers - Part 1: Performance and Structural Requirements, the operating mechanism of fire extinguishers - pressure lifting handle and safety pin must undergo impact test. At present, domestic equipment manufacturers and inspection and testing institutions conduct impact tests on the operating mechanism of fire extinguishers, using manual testing. The main problems of manual inspection are:
(1) It requires manual weight measurement, calculation of impact height, use of pull rope indication, weight release hammer and other steps, which requires high experience and responsibility of testers.
(2) The impact position depends on visual inspection and sometimes judgment to complete the impact test. Different people operate in different ways and there is great uncertainty.
(3) The inspection procedure cannot be repeated. Although the procedure has clear requirements for the weight height, impact position and other tests, it cannot be repeated and the data cannot be traced. When the heavy hammer falls freely, the operator may be injured due to the lack of proper protective parts, and there is a large potential safety hazard during the test.
Through sorting out and analyzing the problems existing in the impact test and detection process of hand-held fire extinguishers, and combining with the requirements of the national standard for impact test of the operating mechanism of fire extinguishers, a set of fully automatic impact test device has been developed using the electromechanical integration technology such as PLC control system, three-claw self-centering mechanism, etc. The equipment has the characteristics of fully automatic impact test, safe and reliable operation, friendly human-machine interface, and lightweight equipment. It can be applied to the detection of portable fire extinguishers of various sizes and specifications, and can essentially avoid the current state of inaccurate manual detection data, non-repeatable measurement process, and unsafe operation.
Through the test, comparison and analysis of several samples in the laboratory, the instrument has achieved the expected design objectives and achieved good application results.
(1) The accuracy of the weighing part of the equipment is within ± 0.5%, and the accuracy of the height measurement part is within ± 0.5%.
(2) Impact mode: one-button operation.
(3) Test cycle: no more than 4 min.
(4) Accuracy: meet the requirements of GB4351.1 Handheld Fire Extinguishers Part: Performance and Structural Requirements.
(5) Operation mode: display in full Chinese characters.
(6) Free format printing of EXCEL report is provided, and operation data can be recorded and traced.
(7) Set administrator and operator two-level login and use permissions to improve the operation security of the equipment.