A secondary impurity-removal recycling system for refining cotton is provided. A first feeding opening is set on the side of the first bin shell, in which the first drum is movably installed, and the first drum is tube shaped. A first mesh is set on the peripheral wall of the first drum, and a first scraper is set at the first feeding opening inside the first bin shell. One end of the first drum is provided with a first impurity-discharging pipe, the outer periphery of which is provided with a first annular hump. The first connecting sleeve is installed on the outer wall of the first bin shell, and the first impurity-discharging pipe is movably stuck in the first connecting sleeve through the first annular hump, and communicates with the first connecting sleeve. The first induced draft fan communicates with the first connecting sleeve through a first air duct.

A secondary impurity-removal recycling system for refining cotton is provided. A first feeding opening is set on the side of the first bin shell, in which the first drum is movably installed, and the first drum is tube shaped. A first mesh is set on the peripheral wall of the first drum, and a first scraper is set at the first feeding opening inside the first bin shell. One end of the first drum is provided with a first impurity-discharging pipe, the outer periphery of which is provided with a first annular hump. The first connecting sleeve is installed on the outer wall of the first bin shell, and the first impurity-discharging pipe is movably stuck in the first connecting sleeve through the first annular hump, and communicates with the first connecting sleeve. The first induced draft fan communicates with the first connecting sleeve through a first air duct.

A module for a fiber preparation machine is a self-supporting element having a cuboid shape with a length (L), a width (B) and a height (H), as well as at least two lateral walls extending in parallel respective planes and spaced apart by the width (B). A cross beam connects the lateral walls to one another. Each of the lateral walls is encompassed by a frame. A first leg of the frame is arranged along the plane of the respective lateral wall and a second leg of the frame is arranged at a right angle to the lateral wall and facing away from the opposite lateral wall. A fiber preparation machine includes a plurality of the modules interconnected together.

A secondary impurity-removal recycling system for refining cotton is provided. A first feeding opening is set on the side of the first bin shell, in which the first drum is movably installed, and the first drum is tube shaped. A first mesh is set on the peripheral wall of the first drum, and a first scraper is set at the first feeding opening inside the first bin shell. One end of the first drum is provided with a first impurity-discharging pipe, the outer periphery of which is provided with a first annular hump. The first connecting sleeve is installed on the outer wall of the first bin shell, and the first impurity-discharging pipe is movably stuck in the first connecting sleeve through the first annular hump, and communicates with the first connecting sleeve. The first induced draft fan communicates with the first connecting sleeve through a first air duct.

A secondary impurity-removal recycling system for refining cotton is provided. A first feeding opening is set on the side of the first bin shell, in which the first drum is movably installed, and the first drum is tube shaped. A first mesh is set on the peripheral wall of the first drum, and a first scraper is set at the first feeding opening inside the first bin shell. One end of the first drum is provided with a first impurity-discharging pipe, the outer periphery of which is provided with a first annular hump. The first connecting sleeve is installed on the outer wall of the first bin shell, and the first impurity-discharging pipe is movably stuck in the first connecting sleeve through the first annular hump, and communicates with the first connecting sleeve. The first induced draft fan communicates with the first connecting sleeve through a first air duct.

A cotton gin for use in a pneumatic cotton harvesting machine. The gin is located in the harvester downstream of the pneumatic picking heads. The gin receives seed bearing cotton balls on a front side of a fiber separation plate. Co-acting and oppositely rotating toothed fiber separation blades protrude through the separation plate and incrementally tear the cotton fiber free from the cotton ball leaving behind the seeds. The separated cotton fiber is, thereafter, drawn from the back or downstream side of the separation plate to a dust collector and then bailed in a dry condition in the harvester in the field. The separated seeds remain in the gin and fall downwardly, via gravity toward and into a seed collecting bin.

A cotton gin for use in a pneumatic cotton harvesting machine. The gin is located in the harvester downstream of the pneumatic picking heads. The gin receives seed bearing cotton balls on a front side of a fiber separation plate. Co-acting and oppositely rotating toothed fiber separation blades protrude through the separation plate and incrementally tear the cotton fiber free from the cotton ball leaving behind the seeds. The separated cotton fiber is, thereafter, drawn from the back or downstream side of the separation plate to a dust collector and then bailed in a dry condition in the harvester in the field. The separated seeds remain in the gin and fall downwardly, via gravity toward and into a seed collecting bin.

A cotton gin for use in a pneumatic cotton harvesting machine. The gin is located in the harvester downstream of the pneumatic picking heads. The gin receives seed bearing cotton balls on a front side of a fiber separation plate. Co-acting and oppositely rotating toothed fiber separation blades protrude through the separation plate and incrementally tear the cotton fiber free from the cotton ball leaving behind the seeds. The separated cotton fiber is, thereafter, drawn from the back or downstream side of the separation plate to a dust collector and then bailed in a dry condition in the harvester in the field. The separated seeds remain in the gin and fall downwardly, via gravity toward and into a seed collecting bin.