【導讀】通常由若干條帶式輸送機互相級聯(lián)交叉組成一套。完整的輸送系統(tǒng)，實現(xiàn)物料的長距離輸送。帶式輸送機的運行狀況直接關系到生產過程中設備和人員的安全。保護裝置高效、可靠、穩(wěn)定地在生產運行中充分發(fā)揮作用有著十分重要的現(xiàn)實意義。拉繩開關是用于帶式輸送機緊急停機的一種現(xiàn)場操作保護裝置。目前廣泛應用的拉繩。開關一般為無源機械式雙向拉繩開關，主要有旋轉式凸輪結構和移動式凸輪結構兩種。緊急情況下，可以在帶式輸送機沿線任意位置拉動拉繩，觸發(fā)開關動作實現(xiàn)緊急停。拉繩開關動作后的復位方式分為自動復位和手動復位兩種。拉繩開關通常都有常閉、常開接點各1個，一般使用常閉接點。由于拉繩開關數(shù)量較。為無源機械式兩級跑偏開關。設備嚴重損壞、火災以及人身傷害等嚴重事故。過載等嚴重后果。另外，缺少行業(yè)標準也是國內帶式輸送機保護裝置產品質量良莠不齊的。擔，如非接觸型的感應式跑偏開關和感應式料流開關等。

　　

【正文】 lag behind, structure plicated, appearance coarse, dependability shorting such as being poor at home. The advanced product market is basically dismembered by foreign countries brand, there is not a brand with stronger petitiveness and influence yet at home. In addition, it is a very different important reason of bringing type conveyer protector product quality at home too to lack the sector standard. In fact, the bringing type conveyer protector market demand of the products is very enormous, the domestic producer only changes the idea, take charge of quality severely, fully utilize the latest technology, developing the new products constantly according to market 9 demand, can certainly reseize the advanced market that the foreign brand is being captured.。 3 improve and developing direction Accord with some application situations of new technologies and new products presented in recent years and see, the bringing type conveyer protector has the following developing trend. First, the development bringing type conveyer protects the automated system synthetically. Develop the intelligent protector, make the onthespot protector possess the munication function。 Employ munication and address code technology, concentrate on to install whole of person who bring in scene conveyer protectors of systems monitor and control, realize the function of restoring to the throne in the status display of distant place and distant place etc.. Second, development integrates, the miniaturization bringing type conveyer protector. Structural pactness, installing simply and conveniently, performance is reliable, nonmaintaining is that various states of future measure the inevitable direction of development of device. Third, employ new detection technique and detection means, until person who bring conveyer protector use shorting and deficiency of course at present, developing can reflect operation state of the conveyer, protector with more reliable and more steady performance effectively 4 conclusions Until to intensive, among technologyintensive mode course that change from extensive style of our country industrial enterprise at present, how in a situation that reducing, personnel put into, can guarantee the production safety, increase efficiency and benefit, raise one39。s own petitiveness of market, it is an important subject in front of each enterprise. The state including bringing type conveyer protector can certainly improve dependability, stability that the apparatus of industrial enterprise operate to measure the improvement of the device, and reflect as the improvement by a large margin of production efficiency finally. 劉寶興：大傾角膠帶輸送機控制系統(tǒng)設計 10 References [1] Dang Kun, Power Flow Modeling of the Servo System for AEG Steering Gear, Proceedings of the 3rd Nationwide Chinese Youth Symposium on Mechanical Engineering. Beijing, Mechanical Industry Publisher, 1998,11:135138 (in Chinese). [2] Dang Kun, Yin Fen, Dynamic Simulation of a Hydraulic Pump Subsystem. Journal of Dalian Maritime University 1998, Vol(24)2:105107(in Chinese).