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本文介绍了两种新型的车门锁定装置的结构形式、锁定原理、锁紧力计算，并论述了该装置在选用时的要求，证实这两种锁定装置符合国家专业标准，可以在起重机上车操纵推广使用。
This paper introduces the structure of two new types of vehicle door locking devices, the principle of locking and the calculation of the locking force, and discusses the requirements of the device when it is used. It proves that these two locking devices are in line with national professional standards and can be used on the crane Promote use.