目的 为使高速卷接机组烟枪成型大压板调节机构能转动灵活且锁紧可靠，有必要减小成品烟支直径与理想直径的误差。方法 分析大压板锁紧机构与烟支直径调节机构的工作原理，研究大压板调节机制和烟支直径卷制质量。通过测试大压板压紧力，得到弹簧工作参数。优化大压板调节机构，使其自锁可靠。结果 根据测量得到的两大压板压紧力分别为137 N和147 N，为确保大压板不分离和卷制质量良好，压缩弹簧弹力需大于209.8 N。优化后最大连杆长度值在[29.2 mm, 29.7 mm]时，大压板锁紧机构可实现自锁。结论 大压板压紧力测算与自锁机构优化可有效地改善烟丝卷制效率，保证了烟支的成品率。

The work aims to reduce the error between the diameter of the finished cigarette and the ideal cigarette to improve the rotation flexibility and locking reliability of the pipe-forming large platen regulating mechanism of the high-speed cigarette making machine. The working principles of large platen locking mechanism and cigarette diameter regulating mechanism were analyzed to study the large platen regulating mechanism and the rolling quality of cigarette. The pressing force of large platen was tested to get the working parameters of spring. The large platen regulating mechanism was optimized for reliable self-locking. Through measurement, the pressing force of the two large platens was 137 N and 147 N, respectively. The elastic force of the compression spring was greater than 209.8 N, which ensured non-separation of large platens and good rolling quality. The locking mechanism of the large platen realized good self-locking effect when the maximum length of the optimized connecting rod was in the range of [29.2 mm, 29.7 mm].The pressing force calculation of large platen and the optimization of self-locking mechanism can effectively improve the rolling efficiency of cigarette and ensure the production yield.