Endless sieve belt draining device for paper machines |
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| 申请号 | US26810372 | 申请日 | 1972-06-30 | 公开(公告)号 | US3819474A | 公开(公告)日 | 1974-06-25 |
| 申请人 | FINCKH METALLTUCH MASCHF; | 发明人 | HOLZ E; | ||||
| 摘要 | A draining device for a paper making machine including a longitudinal sieve which carries a slurry of paper material, a rotatable draining roller, at least one further roller, a pair of register rollers disposed with one on each side of the draining roller, and an endless sieve belt. The draining roller has a sieve-type outer surface. The endless sieve belt extends over the draining roller and the further roller and moves over these rollers at the same linear velocity as the longitudinal sieve. The endless sieve draining belt extends approximately parallel to the longitudinal sieve between the register rollers. | ||||||
| 权利要求 | 1. A draining device for a paper making machine of the type having a paper slurry-carrying longitudinal sieve travelling over and in engagement with a pair of register rollers spaced from one another in the travelling direction of the longitudinal sieve, one of the register rollers being an upstream or first register roller and the other being a downstream or second register roller, comprising in combination: a. a first end roller having a perforated surface, said first end roller being supported above said longitudinal sieve between said first and second register rollers, said first end roller being situated at a first vertical distance from said longitudinal sieve and being at least partially immersed in the paper slurry; b. a second end roller being supported above said longitudinal sieve downstream of said second register roller, said second end roller being situated at a second vertical distance from said longitudinal sieve, and being out of contact with said paper slurry, said second vertical distance being greater than said first vertical distance; and c. an endless draining sieve belt trained about said first and second end rollers and being driven with the same linear velocity as said longitudinal sieve, said endless sieve belt having a path of action extending from the location it enters said slurry to a location directly above the highest point of engagement between said second register roller and said longitudinal sieve, said first and second distances being so related to one another that said endless sieve belt extends parallel to said longitudinal sieve along said path of action. 2. A device as defined in claim 1, wherein that portion of said endless sieve belt and the longitudinal sieve which extend downstream of the area of contact of the longitudinal sieve and the second register roller form an angle with one another that is greater than 0* and no more than 10*. 3. A device as defined in claim 1, including steam jet generating means disposed between said end rollers above said longitudinal sieve and immediately downstream of the location of contact between said second register roller and said longitudinal sieve for directing a steam jet through said endless sieve belt into a zone immediately above said longitudinal sieve to prevent the formation of subatmospheric pressure in said zone. 4. A device as defined in claim 1, wherein said second end roller is provided on its outer surface with helical grooves starting at its center and extending axially outwardly in opposite winding directions from said center. 5. A device as defined in claim 1, further comprising means for tensioning said endless sieve belt. 6. A device as defined in claim 5 wherein said tensioning means includes guide grooves provided at the axial ends of said first and second end rollers, an elastic guide strap at each transverse end of said sieve belt, each said strap moves in a corresponding guide groove in said first and second end rollers, and setting gear means connected between said first and second end rollers, said endless sieve belt is tensioned by the adjustment of the spacing between said first and second end rollers by said setting gear means and the retention of the distance between said guide straps. 7. A device as defined in claim 6, wherein said endless sieve belt is formed of a bias cut fabric. 8. A device as defined in claim 6, wherein said endless sieve belt is a metal wire fabric. 9. A device as defined in claim 7, wherein said fabric is of bronze. 10. A device as defined in claim 7, wherein said fabric is of stainless steel. 11. A device as defined in claim 5, wherein said tensioning means includes discs which are provided with guide grooves therein, means for displacing said discs in a direction transverse to the movement of the longitudinal sieve, and an eLastic guide strap at each transverse end of said endless sieve belt, each strap moves in a corresponding guide groove in said first and second end rollers, said endless sieve belt is tensioned by the adjustment of said discs by said means for displacing. 12. A device as defined in claim 11, wherein said endless sieve belt is of plastic. 13. A device as defined in claim 11, wherein said means for displacing are springs. 14. A device as defined in claim 11, wherein said means for displacing are hydraulic cylinders. 15. A device as defined in claim 11, wherein said means for displacing are pneumatic cylinders. 16. A device as defined in claim 5, wherein said tensioning means includes discs which are provided with guide grooves therein, means for displacing said discs in a direction transverse to the movement of the longitudinal sieve, an elastic guide strap at each transverse end of said endless sieve belt, each strap moves in a corresponding guide groove in said first and second end rollers, and setting gear means connected between said first and second end rollers, said endless sieve belt is tensioned by the adjustment of said discs by said means for displacing and the adjustment of the spacing between said first and second end rollers by said setting gear means. 17. A device as defined in claim 16, wherein said means for producing said transverse displacement are springs. 18. A device as defined in claim 16, wherein said means for producing said transverse displacement are hydraulic cylinders. 19. A device as defined in claim 16, wherein said means for producing said transverse displacement are pneumatic cylinders. 20. A device as defined in claim 1 further comprising a collecting trough for the water splashed from said first end roller, said trough being provided in the region enclosed by said endless sieve belt. 21. A device as defined in claim 20 further comprising a cleaning device for said endless belt sieve, and wherein said collecting trough is disposed to collect the water from said endless belt sieve cleaning device. 22. A device as defined in claim 1, wherein at least said second register roller is provided with an outer surface having openings therein, and has a subatmospheric pressure existing in its interior. |
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