Spinning device and method for producing wrapped-core yarns

1 . 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 staple fiber channel and a filament channel, the filament channel is separated from the staple fiber channel by a target spacing, a width of the staple fiber channel is 5-10 mm, the target spacing between the staple fiber channel and the filament channel is 2-5 mm, a width of the filament channel is 3-5 mm, the staple fiber channel is a channel with a same width along a conveying direction of the staple fiber strands, or a channel with a shape of gradually widening along the conveying direction of the staple fiber strands; and when the staple fiber channel is the channel with the shape of gradually widening, a width of a narrower channel portion of the staple fiber channel is 5-7 mm;

wherein the auxiliary core-wrapping assembly is internally provided with a negative pressure air suction assembly, 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.

2 . The spinning device as claimed in claim 1 , wherein the core yarn feeding unit is provided with an electrostatic fiber opening assembly and a threaded guide rod, the electrostatic fiber opening assembly is configured to electrostatically open the core yarn to form a ribbon-like fiber, the threaded guide rod is configured to input the ribbon-like fiber into the auxiliary core-wrapping unit, and the ribbon-like fiber is partially or completely overlapped with the staple fiber strands in the auxiliary core-wrapping unit;

wherein the auxiliary core-wrapping assembly is a negative pressure adsorption assembly, the negative pressure adsorption assembly comprises an air suction plate, a drive roller, an annular grid sleeved on outer surfaces of the air suction plate and the drive roller, and an air suction assembly disposed in the air suction plate, and the air suction assembly is configured to adsorb the staple fiber strands and the ribbon-like fiber on a surface of the annular grid under negative pressure;

wherein the negative pressure adsorption assembly further comprises a negative pressure suction port disposed on a surface of the air suction plate, the negative pressure suction port is covered by the annular grid, a narrowest width of the negative pressure suction port is not less than a width of each of the staple fiber channel and the ribbon-like fiber, the negative pressure adsorption assembly is configured to adsorb the staple fiber strands and the ribbon-like fiber on the surface of the annular grid through the negative pressure suction port, to open the staple fiber strands and further expand the ribbon-like fiber, the negative pressure suction port is an air outlet with a same width along a conveying direction of the staple fiber strands and the ribbon-like fiber, or an air outlet with a shape of gradually widening along a conveying direction of the staple fiber strands and the ribbon-like fiber, and a narrowest width of the negative pressure suction port is 5-10 mm; and

wherein the pressurizing/conveying assembly comprises a transmission gear and an auxiliary conveying component disposed opposite to the annular grid, the auxiliary conveying component comprises a front top roller, a drive top roller and a bridge component connecting the front top roller and the drive top roller, the front top roller is configured to drive the bridge component to synchronously rotate the drive top roller; and the drive top roller is configured to be in contact with the annular grid to drive the annular grid to rotate and transport forward.

3 . The spinning device as claimed in claim 1 , wherein the staple fiber feeding unit comprises a bell mouth, a rear roller, a rear top roller, a middle roller and a middle top roller;

wherein the core yarn feeding unit comprises a godet, the yarn guiding assembly comprises a yarn guiding rod and a heating groove disposed on the yarn guiding rod, and the yarn winding unit comprises a guide hook, a traveler, a steel ring and a ring bobbin.

4 . The spinning device as claimed in claim 1 , wherein the staple fiber feeding unit comprises a bell mouth, a rear roller, a rear top roller, a middle roller and a middle top roller;

wherein the core yarn feeding unit comprises a godet, the yarn guiding assembly comprises a connecting component connected with the pressurizing/conveying assembly and a compliant reinforcing component connected with the connecting component, and the compliant reinforcing component comprises a heating compliant block and a reinforcing block arranged along an advancing direction of the wrapped-core yarn; and

wherein the yarn winding unit comprises a guide hook, a traveler, a steel ring and a ring bobbin.

5 . The spinning device as claimed in claim 1 , wherein the staple fiber feeding unit comprises a bell mouth, a rear roller, a rear top roller, a middle roller and a middle top roller;

wherein the core yarn feeding unit comprises a core yarn unwinding unit, a tension adjusting frame and a godet arranged along an advancing direction of the core yarn; the core yarn unwinding unit comprises a pair of unwinding rollers rotating in a same direction, and the unwinding rollers are meshed with a winding roller for winding the core yarn; and the tension adjusting frame comprises tension adjusting rods arranged in parallel; and

wherein the yarn guiding assembly comprises a yarn guiding rod and a heating groove disposed on the yarn guiding rod, and the yarn winding unit comprises a guide hook, a traveler, a steel ring and a ring bobbin.

6 . The spinning device as claimed in claim 1 , wherein the staple fiber feeding unit comprises a bell mouth, a rear roller, a rear top roller, a middle roller and a middle top roller;

wherein the core yarn feeding unit comprises a core yarn unwinding unit, a tension adjusting frame and a godet arranged along an advancing direction of the core yarn; the core yarn unwinding unit comprises a pair of unwinding rollers rotating in a same direction, and the unwinding rollers are meshed with a winding roller for winding the core yarn; and the tension adjusting frame comprises tension adjusting rods arranged in parallel;

wherein the yarn guiding assembly comprises a connecting component connected with the pressurizing/conveying assembly and a compliant reinforcing component connected with the connecting component, and the compliant reinforcing component comprises a heating compliant block and a reinforcing block arranged along an advancing direction of the wrapped-core yarn; and

wherein the yarn winding unit comprises a guide hook, a traveler, a steel ring and a ring bobbin.

7 . 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.

8 . The spinning device as claimed in claim 7 , wherein the pressurizing/conveying assembly comprises a front top roller, a drive top roller and a bridge component connecting the front top roller and the drive top roller, the front top roller is configured to drive the bridge component to synchronously rotate the drive top roller, the drive top roller is configured to be in contact with the annular grid to drive the annular grid to rotate and transport forward, a middle of the drive top roller is provided with a roller groove with a width, and the width of the roller groove is one third of a width of the drive top roller.

9 . The spinning device as claimed in claim 8 , wherein the negative pressure suction ports are one of the following three types: air ports uniformly distributed on the pipe, equal-width air ports formed along a curved surface of the pipe, or air ports disposed on the pipe and gradually widened along a conveying direction of the widened strands on the annular grid.

10 . The spinning device as claimed in claim 9 , wherein the yarn guiding assembly comprises a yarn guiding rod and a heating groove disposed on the yarn guiding rod.

11 . The spinning device as claimed in claim 10 , wherein a temperature of the heating groove is 100-200° C., the heating groove is configured to change a transmission path of a yarn output from the auxiliary core-wrapping unit, and the yarn guiding rod is configured to convey the yarn to the yarn winding unit.

12 . The spinning device as claimed in claim 9 , wherein the yarn guiding assembly comprises a connecting component connected with the pressurizing/conveying assembly and a compliant reinforcing component connected with the connecting component, and the compliant reinforcing component comprises a heating compliant block and a reinforcing block arranged along an advancing direction of the wrapped-core yarn.

13 . The spinning device as claimed in claim 12 , wherein the auxiliary core-wrapping assembly is internally provided with a staple fiber channel and a filament channel, the filament channel is separated from the staple fiber channel by a target spacing, a width of the staple fiber channel is 5-10 mm, the target spacing between the staple fiber channel and the filament channel is 2-5 mm, a width of the filament channel is 3-5 mm, the staple fiber channel is a channel with a same width along a conveying direction of the staple fiber strands, or a channel with a shape of gradually widening along the conveying direction of the staple fiber strands; and when the staple fiber channel is the channel with the shape of gradually widening, a width of a narrower channel portion of the staple fiber channel is 5-7 mm.

14 . 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.