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2005年8月上旬,攀长钢计量检测中心理化三车间用于检验钢样品硬度的 HB-3000型布氏硬度计中的换相开关损坏,无法使用。因该硬度计是1966年的产品,买不到备品备件,而许多样品等待检验。为此,我们设计了电动换向开关代替原来的机械换向开关:用两个继电器作为换相电源,利用原换向开关的常开和常闭触点作为控制信号,控制该硬度计沿工作台上下移动。试验表明,此次设计的电动换向开关性能良好,完全满足生产要求,成功地解决了 HB-3000型布氏硬度计因换相开关无配件而无法使用的难题。
In early August 2005, Panlong Steel Measurement and Testing Center physical and chemical three workshop for testing the hardness of the HB-3000 Brinell hardness tester commutation switch damage, can not be used. Because of the hardness of 1966 products, can not buy spare parts, and many samples are waiting for inspection. To this end, we designed the electric reversing switch instead of the original mechanical commutation switch: use two relays as commutation power, use the original commutation switch normally open and normally closed contacts as the control signal, control the hardness along the work Move up and down the stage. Experiments show that the design of the electric switch to good performance, fully meet the production requirements, successfully solved the HB-3000-based Brinell due to the phase change switch without accessories and can not use the problem.