Roller blind device

1. A roller blind device, comprising a special curtain ( 20 ), wherein, said roller blind device also comprises a first circular tube ( 1 ) for fixing an upper end of said special curtain ( 20 ) and a second circular tube ( 39 ) for fixing an lower end of said special curtain ( 20 ); a torsion spiral ( 37 ) which is capable of rolling up said special curtain ( 20 ) and a stop element ( 10 ) for stopping a lifting of said second circular tube ( 39 ) are arranged in said second circular tube ( 39 ); wherein said roller blind device comprises an iron baffle ( 51 ), on both ends of which a first connection plate ( 491 ) of “Z” shape of a left flexing iron plate ( 49 ) and a second connection plate ( 501 ) of “Z” shape of a right flexing iron plate ( 50 ) are fixed; an included angle between said first connection plate ( 491 ) and a first bending plate ( 492 ) connected together is a right angle, an included angle between said first bending plate ( 492 ) and a third connection plate ( 493 ) connected together is a right angle, an included angle between said second connection plate ( 501 ) and a second bending plate ( 502 ) connected together is a right angle, and an included angle between said second bending plate ( 502 ) and a fourth connection plate ( 503 ) connected together is a right angle; said right flexing iron plate ( 50 ) is a minor of said left flexing iron plate ( 49 ), and two circular iron shafts ( 36 ) are fixed symmetrically on said first bending plate ( 492 ) and said second bending plate ( 502 ).

2. The roller blind device according to claim 1 , wherein said circular iron shaft ( 36 ) comprises a stepped circular shaft; a free-rotating nylon bearing ( 17 ) with a groove ( 171 ) and a projecting edge ( 172 ) for fixing a ribbing ( 391 ) and a section of said second circular tube respectively on its external surface, is arranged outside of said stepped circular shaft.

3. The roller blind device according to claim 2 , wherein the left end ( 322 ) of a bar of iron square shaft ( 32 ) is fixed in the centre square hole ( 361 ) of said left circular iron shaft ( 36 ); said iron square shaft ( 32 ) is inserted into the right end square hole ( 371 ) of the torsion spiral ( 37 ), the left end post ( 372 ) of the torsion spiral is fixed in the right side hole ( 175 ) of said left nylon bearing ( 17 ).

4. The roller blind device according to claim 3 , wherein said stop element ( 10 ) comprises an iron connecting element ( 14 ) which is permanently connected with the right end hole ( 32 ) of said iron square shaft ( 32 ); an iron screw shaft ( 31 ), the right end of which is cut into a square stem ( 311 ) and fixed in the centre square hole ( 361 ) of said right circular iron shaft ( 36 ) while the left end hole ( 312 ) of which is fixed in said iron connecting element ( 14 ); a nylon supporting runner ( 13 ) provided with a groove ( 132 ) outside to clamp tightly in the ribbing ( 39 ) inside said second circular tube ( 39 ) and a circular hole inside to rotate outside of said iron connecting element ( 14 ); and an iron distance-metering gear ( 12 ) which is provided with a groove ( 122 ) outside to slide along the ribbing ( 391 ) inside said second circular tube ( 39 ) and a screw hole ( 121 ) at the centre to rotate around said iron screw shaft ( 31 ), said iron distance-metering gear ( 12 ) breaks away from or combines with said iron connecting element ( 14 ) to enable said second circular tube ( 39 ) to rotate or to be lifted and move up and down.

5. The roller blind device according to claim 4 , wherein the weight of said iron baffle ( 51 ) is maintained approximately stable with said second circular tube ( 39 ) and its internal components by taking said right flexing iron plate ( 50 ) or said left flexing iron plate ( 49 ) as a lever and taking said special curtain ( 20 ) as a fulcrum.

6. The roller blind device according to claim 4 , wherein the locations and weights of said torsion spiral ( 37 ), said iron distance-metering gear ( 12 ), said nylon supporting runner ( 13 ) and said iron connecting element ( 14 ) are maintained approximately stable by taking said second circular tube ( 39 ) as a lever and taking the centre of said special curtain ( 20 ) as a fulcrum.

7. The roller blind device according to claim 4 , wherein the both ends of said iron baffle ( 51 ) move up and down in the vertical direction along grooves ( 522 ) of aluminium alloy tracks of “F” shape ( 52 ) on both sides; the both flat surfaces of said aluminium alloy track of “F” shape are not reflective.

8. The roller blind device according to claim 1 , wherein said special curtain ( 20 ) is made of at least two different curtain materials having a length which is slightly higher than a height of the window.

9. The roller blind device according to claim 1 , wherein there is a circular hole ( 4931 , 5031 ) on each of said third connection plate ( 493 ) and said fourth connection plate ( 503 ); said circular hole ( 4931 , 5031 ) can slide to two iron cones ( 53 ) at the same level of the windowsill ( 2 ); said third connection plate ( 493 ) and said fourth connection plate ( 503 ) fix a bar of supporting aluminium alloy corner ( 55 ) by a rivet at the same time.