Telescopic curtain guide rail

A telescopic curtain guide rail, comprising:

• an inner rail, an outer rail, a guide sleeve and a transmission unit;
• wherein the inner rail is connected to a side of the outer rail, and the inner rail is embedded in the outer rail and slidable along the outer rail;
• wherein the transmission unit comprises a driving wheel, a driven wheel, a first fixed pulley and a second fixed pulley, and a conveyor belt, the driving wheel and the driven wheel are respectively located at two opposite ends of the telescopic curtain guide rail, the driving wheel is connected with a motor, the driving wheel is located at an end of the inner rail or the outer rail, the driving wheel and the first fixed pulley are fixed at both ends of one of the inner rail and the outer rail, and the driven wheel and the second fixed pulley are fixed at both ends of the other of the outer rail and the inner rail;
• the conveyor belt is wound on the driving wheel, the driven wheel, the second fixed pulley and the first fixed pulley sequentially in that order and then returns back to the driving wheel;
• wherein sections of the conveyor belt between the driving wheel, the driven wheel, the second fixed pulley and the first fixed pulley are all parallel to allow a rail trolley of the telescopic curtain guide rail to be movable along an axial direction of the outer rail and the inner rail driven by the conveyor belt;
• wherein when the inner rail moves towards the outer rail, a distance between the driven wheel and the driving wheel decreases, while a distance between the first fixed pulley and the second fixed pulley increases;
• conversely, when the inner rail moves away from the outer rail, the distance between the driven wheel and the driving wheel is increased increases, while the distance between the first fixed pulley and the second fixed pulley decreases;
• and when the motor drives the driving wheel to rotate, the driving wheel drives the conveyor belt;
• wherein the guide sleeve is a hollow tubular structure with openings at both ends, and the guide sleeve is sleeved outside a connection between the outer rail and the inner rail;
• wherein the outer rail comprises an upper-end first closed groove and a lower-end first opening groove, the inner rail comprises an upper-end second closed groove and a lower-end second opening groove, the upper-end first closed groove is embedded in the upper-end second closed groove, the lower-end second opening groove is embedded in the lower-end first opening groove, and a horizontal cross-sectional area of the lower-end second opening groove is less than that of the lower-end first opening groove;
• wherein the inner rail further comprises a first partition plate, the first partition plate is located in the lower-end second opening groove, an upper end of the first partition plate is fixedly connected to an outer side of a bottom of the upper-end second closed groove, segments of the conveyor belt located on two sides of the driven wheel are respectively disposed on two sides of the first partition plate, and groove bottoms of the upper-end first closed groove and the upper-end second closed groove respectively are disposed with protrusions matched with each other;
• wherein one side wall of the lower-end second opening groove is in contact with one side wall of the lower-end first opening groove, another side wall of the lower-end second opening groove and another side wall of the lower-end first opening groove together form a fixed pulley receiving chamber, a bottom of the fixed pulley receiving chamber comprises a bottom surface of the outer rail and a bottom surface of the inner rail, and the bottom surface of the inner rail is located above the bottom surface of the outer rail and coincides with the bottom surface of the outer rail;
• wherein portions of the conveyor belt located on two sides of the second fixed pulley are respectively disposed on two sides of the side wall of the lower-end second opening groove close to the fixed pulley receiving chamber;
• and
• wherein the outer rail comprises an L-shaped partition plate, the L-shaped partition plate is located in the fixed pulley receiving chamber and fixedly connected to an inner wall of the lower-end first opening groove, and portions of the conveyor belt located on two sides of the first fixed pulley are respectively located on two sides of the L-shaped partition plate.