Multi-step leather collar lower pin

Abstract

The invention discloses a multistep leather ring bottom pin. The multistep leather ring bottom pin comprises a bottom pin body; a section of the bottom pin body is of a T shape generally; any section of the bottom pin body has the same shape; the top surface of the bottom pin body at least comprises a first table-board and a second table-board; and the second table-board is higher than the first table-board and lower than the highest top surface of the bottom pin body. A width a of the first table-board is between 2 and 4.5 millimeters, and a width b of the second table-board is between 1.5 and 3.5 millimeters. The height different h1 between the first table-board and the second table-board is between 1 and 2 millimeters, and the height different h2 between the second table-board and the highest top surface is between 0.5 and 1 millimeter. The top surface of the bottom pin body also comprises a third table-board, and the third table-board is higher than the second table-board and lower than the highest top surface. The leather ring bottom pin can keep the good elasticity of a working section of the lower leather ring, can effectively strengthen the frictional force field in the middle part of the leather ring and is widely suitable for drawing devices of a fine spinning machine, a coarse spinning machine and other spinning machines.

Description

technical field [0001] The invention relates to a drafting device of a spinning machine, in particular to the improvement of the lower pin structure of an apron of a spinning drafting device such as a spinning frame and a roving frame. Background technique [0002] The drafting device in spinning frames such as spinning frames and roving frames has a direct correlation with the strength of its drafting ability and the quality of yarn formation. The front drafting area of ​​the drafting device of the existing ring spinning frame mostly adopts the drafting structure type of long and short double aprons. The joint action of the lower pins of the circle realizes the drafting of the fiber sliver. At the apron pin, the working surfaces of the upper and lower aprons are in direct contact with the yarn sliver, forming a soft apron jaw with a certain pressure, so as to generate a certain friction force, control the fiber movement, and ensure the smooth extraction of the fiber. The ...

AI Technical Summary

Problems solved by technology

The lower pin of the apron in the existing structure has insufficient grip on the fibers, especially the arched elastic layer in the middle of the apron lacks sufficient external pressure, and the fiber strands are difficult to withstand the tension transmitted from the front and split

More importantly, the position of the arched elastic layer of the lower apron on the plane part of the lower pin is prone to a concave phenomenon, resulting in weakening and instability of the friction force circle in the middle, which directly affects the control of the apron jaws on the fiber strands. Its draft ability, especially in the case of high draft in the front area, is severely restricted, resulting in poor yarn evenness and low strength

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