| 摘要 |
Disclosed is a drafting device in a spinning frame, which comprises a front roller (1), a front belt roller (2), a middle roller (3) and a middle belt roller (4), wherein a front jaw (19) is formed between the front belt roller and the front roller; a middle jaw (20) is formed between the middle belt roller and the middle roller; a negative pressure pipe (7) is arranged between the front roller and the middle roller; the middle part of the upper surface of the negative pressure pipe is provided with a groove (11); a front aggregation port (9) and a rear aggregation port (10) are provided on the upper surface of the negative pressure pipe; a tension device (13) is arranged below the middle roller and the negative pressure pipe; a flexural collar made of a breathable material is wound around the middle roller, the upper surface of the negative pressure pipe and the tension device, and covers the openings of the front aggregation port and the rear aggregation port entirely; an upper pin (8) is arranged above the connecting line of the front jaw and the middle jaw and between the front belt roller and the middle belt roller; the lower surface of the upper pin is provided with an arc-surfaced lug boss (16); and the end of the arc-surfaced lug boss which extends downwards is butted with the flexural collar at the groove on the upper surface of the negative pressure pipe. |
