Device for controlling yarn feeding tension of false-twist texturing machine

A device for controlling yarn feeding tension of a false-twist texturing machine, comprising:

• a support frame;
• wherein a first support roller group and a second support roller group are symmetrically and rotatably arranged at a first side and a second side of the support frame, respectively;
• an inner side of the support frame is slidably provided with a tensioning roller assembly;
• the support frame is slidably provided with a lifting frame assembly, and the lifting frame assembly is configured to drive the tensioning roller assembly to move upward;
• and a first dustproof cover assembly and a second dustproof cover assembly are symmetrically arranged on tops of the first side and the second side of the support frame, respectively;
• the tensioning roller assembly comprises a tensioning roller, and a plurality of annular guide channels are arranged evenly spaced apart on an outer peripheral surface of the tensioning roller;
• and a first end and a second end of the tensioning roller are each provided with a slider, a third side and a fourth side of the support frame are each provided with a rectangular slideway fitting the slider, and the slider is provided with an annular protrusion coaxial with the tensioning roller;
• a first linkage assembly is arranged at the annular protrusion corresponding to the first end of the tensioning roller;
• a second linkage assembly is arranged at the annular protrusion corresponding to the second end of the tensioning roller;
• and the first linkage assembly and the second linkage assembly are configured to move up and down with the tensioning roller assembly to drive the first support roller group and the second support roller group to switch between an unfolded state and a folded state;
• each of the first linkage assembly and the second linkage assembly comprises a cylinder rotatably arranged in the annular protrusion;
• an end of the cylinder is fixedly provided with a fan-shaped block;
• two edges of a side of the fan-shaped block are symmetrically and rotatably provided with two linkage arms;
• an end of one of the two linkage arms away from the fan-shaped block is rotatably connected to a side wall of the first support roller group, and an end of the other of the two linkage arms away from the fan-shaped block is rotatably connected to a side wall of the second support roller group;
• a locking assembly is provided inside the cylinder, and is configured to limit rotation of the cylinder relative to the annular protrusion;
• an inner side of each of the first support roller group and the second support roller group is rotatably provided with a tensioning assembly;
• the tensioning assembly comprises a strip-shaped frame;
• an inner side of the strip-shaped frame is slidably provided with a movable strip;
• and a side of the strip-shaped frame is rotatably provided with a plurality of yarn guiding assemblies;
• and
• the fan-shaped block is provided with a screw hole coaxial with the cylinder;
• the locking assembly comprises a first adjusting bolt rotatably arranged in the screw hole;
• the first adjusting bolt is insertedly arranged in the cylinder;
• an end of the first adjusting bolt close to an inner side of the cylinder is rotatably provided with an expansion clamping ring;
• the expansion clamping ring has a truncated cone structure;
• an outer peripheral surface of the cylinder is provided with a strip-shaped notch;
• a clamping block is hingedly provided inside the strip-shaped notch;
• and a side surface of the clamping block close to the expansion clamping ring is configured to be inclined.