Spinning device and method for producing wrapped-core yarns

A spinning device, the spinning device comprising a feeding unit, an auxiliary core-wrapping unit and a yarn winding unit;

• wherein the feeding unit comprises:
• a staple fiber feeding unit, configured to stretch a roving into differential dispersed staple fiber strands and feed the staple fiber strands into the auxiliary core-wrapping unit;
• a core yarn feeding unit, configured to feed a core yarn into the auxiliary core-wrapping unit;
• and
• a front roller, disposed at an input end of the auxiliary core-wrapping unit;
• wherein the auxiliary core-wrapping unit comprises:
• an auxiliary core-wrapping assembly;
• a pressurizing/conveying assembly, configured to provide pressure or power to the auxiliary core-wrapping assembly;
• a yarn guiding assembly, disposed between the auxiliary core-wrapping assembly and the yarn winding unit;
• and
• a wrapping area for wrapping and converging;
• and
• wherein the auxiliary core-wrapping unit is configured to make the staple fiber strands intersect and converge with the core yarn at the wrapping area and make the staple fiber strands integrally wrap the core yarn to form a wrapped-core yarn;
• and is configured to convey the wrapped-core yarn to the yarn winding unit for twisting and winding;
• and
• wherein the auxiliary core-wrapping assembly comprises:
• a pipe, an annular grid covered on a surface of the pipe, and negative pressure suction ports disposed on the pipe, the annular grid is configured to only allow airflow to pass therethrough, and is configured to widen and spread the staple fiber strands to form a differential dispersed widened strand, and the negative pressure suction ports are covered by the annular grid arranged on the surface of the pipe.

A spinning device, the spinning device comprising a feeding unit, an auxiliary core-wrapping unit and a yarn winding unit;

• wherein the feeding unit comprises:
• a staple fiber feeding unit, configured to stretch a roving into differential dispersed staple fiber strands and feed the staple fiber strands into the auxiliary core-wrapping unit;
• a core yarn feeding unit, configured to feed a core yarn into the auxiliary core-wrapping unit;
• and
• a front roller disposed at an input end of the auxiliary core-wrapping unit;
• wherein the auxiliary core-wrapping unit comprises:
• an auxiliary core-wrapping assembly;
• a pressurizing/conveying assembly, configured to provide pressure or power to the auxiliary core-wrapping assembly;
• a yarn guiding assembly, disposed between the auxiliary core-wrapping assembly and the yarn winding unit;
• and
• a wrapping area for wrapping and converging;
• and
• wherein the auxiliary core-wrapping unit is configured to make the staple fiber strands intersect and converge with the core yarn at the wrapping area and make the staple fiber strands integrally wrap the core yarn to form a wrapped-core yarn;
• and is configured to convey the wrapped-core yarn to the yarn winding unit for twisting and winding;
• wherein the auxiliary core-wrapping assembly is internally provided with a negative pressure air suction assembly and a staple fiber channel, a surface facing towards the negative pressure air suction assembly of the staple fiber channel is provided with uniform grid holes, and the negative pressure air suction assembly is configured to adsorb the staple fiber strands in the staple fiber channel through the uniform grid holes;
• and
• wherein the pressurizing/conveying assembly comprises a front top roller and a bridge component connecting the front top roller and the auxiliary core-wrapping assembly, the front top roller and the front roller are oppositely arranged, a nip is defined between the front top roller and the front roller and is configured to output the staple fiber strands and the core yarn to the auxiliary core-wrapping assembly, and the bridge component is configured to exert pressure on the auxiliary core-wrapping assembly to make an inner side of the auxiliary core-wrapping assembly attach to a surface of the front roller.