Claims
- 1. An apparatus for removing high density contaminants from cellulosic pulp, comprising a cleaning vessel including an upper separating chamber and a lower reject chamber communicating with the lower end of the separating chamber, inlet means for introducing cellulosic pulp into said separating chamber, first outlet means for discharging cellulosic pulp from said separating chamber, means for swirling the pulp within the separating chamber to cause high density contaminants in said pulp to migrate downwardly from the separation chamber into said reject chamber, upper valve means located between the separating chamber and the reject chamber for controlling the flow of pulp therebetween, second outlet means disposed at the lower end of said reject chamber, lower valve means for controlling the flow through said second outlet means, said lower valve means including an annular valve seat bordering said second outlet means and having a downwardly converging sealing surface, said lower valve means also including a valve member disposed in the reject chamber and having a downwardly converging outer surface disposed to engage said valve seat and having a generally convex upper surface, and power operated drive means secured to said valve member and disposed outwardly of said reject chamber for moving said valve member from a closed to an open position and for moving said valve member from said open position to said closed position, said power operated drive means extending through said second outlet means and into said reject chamber when said valve member is in the open position.
- 2. The apparatus of claim 1, and including vent means communicating with said reject chamber for venting pressure from the reject chamber after closing of said upper valve means and prior to opening of said lower valve means.
- 3. The apparatus of claim 2, and including means for introducing flushing water into said reject chamber after said upper valve means is closed and said lower valve means is open to thereby flush rejected contaminants from said reject chamber.
- 4. The apparatus of claim 1, wherein said valve member is a spherical ball.
- 5. The apparatus of claim 1, wherein said valve member has a frusto-conical peripheral surface disposed to engage said seat.
- 6. The apparatus of claim 5, wherein the upper surface of said valve member is dome shaped.
- 7. The apparatus of claim 1, wherein said drive means comprises a fluid cylinder unit operably connected to a lower end of said valve member.
- 8. The apparatus of claim 7, wherein said fluid cylinder unit comprises a cylinder and piston means slidable relative to said cylinder and including a piston rod, said apparatus also including a stem connected to said valve member and connecting means operably connecting an outer end of said piston rod to said stem.
- 9. The apparatus of claim 8, wherein said connecting means includes a lost motion connection.
- 10. The apparatus of claim 9, wherein said lost-motion connection comprises an axial recess in said outer end of the piston rod, and a slide on the end of said stem and mounted for sliding movement in said recess, and retaining means on said piston rod to prevent displacement of said slide from said recess.
- 11. The apparatus of claim 10, wherein said slide comprises a ball.
- 12. An apparatus for removing high density contaminants from cellulosic pulp, comprising a vessel defining a separation chamber and a reject chamber connected to the lower end of said separation chamber, inlet means in the upper end of said separation chamber for introducing cellulosic pulp into said separation chamber, outlet means in the upper end of said separation chamber for discharging said pulp from said separation chamber, means for causing said pulp to swirl within said separation chamber to thereby separate high density contaminants from said pulp, said high density contaminants migrating downwardly from said separation chamber to said reject chamber and being collected therein, upper valve means located between the lower end of said separation chamber and said reject chamber for controlling the flow of material therebetween, an outlet in the lower end of the reject chamber, lower valve means for controlling the flow of contaminants through said outlet and including an annular valve seat bordering said outlet and a valve member disposed in the reject chamber to engage said valve seat, power operated fluid cylinder means located beneath said reject chamber and secured to the lower end of said valve member for moving said valve member in a vertical reciprocating path of movement between a closed position and an open position, said fluid cylinder means extending through said second outlet means and into said reject chamber when said valve member is in the open position, vent means communicating with the reject chamber for venting pressure from the reject chamber after closing of said upper valve means and prior to opening of said lower valve means, and means for introducing flushing water into said reject chamber after said upper valve means is closed and said lower valve means is open to flush said contaminants from said reject chamber.
- 13. The apparatus of claim 12, wherein said valve member is a ball and said valve seat has a partially spherical contour.
- 14. The apparatus of claim 12, wherein said fluid cylinder means includes a piston rod, an elongated connecting rod connected to said valve member, and a lost-motion connection connecting said piston rod and said connecting rod.
- 15. The apparatus of claim 14, wherein said lost-motion connection comprises an elongated axial recess in an outer end of the piston rod, a slide mounted on a distal end of said connecting rod and slidable within said recess, and retaining means on said piston rod to prevent displacement of said slide from said recess, initial outward movement of said piston rod acting to move said rod relative to said slide until said slide engages a bottom surface of said recess, and further outward movement of said piston rod acting to move said connecting rod upwardly and open said valve member.
- 16. The apparatus of claim 14, wherein one of said valve seat and said valve member is composed of metal and the other of said valve seat and said valve member is composed of a polymeric material softer than said metal.
- 17. The apparatus of claim 14, and including shield means mounted on said connecting rod for preventing contaminants being discharged from said reject chamber from contacting said piston rod.
Parent Case Info
This is a continuation of application Ser. No. 08/330,429, filed Oct. 27, 1994, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
38274 |
Jun 1956 |
DEX |
Non-Patent Literature Citations (1)
Entry |
"High Density Cleaner Efficiency Determined by Design Materials", Pulp & Paper, Aug. 1994, pp. 42-45. |
Continuations (1)
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Number |
Date |
Country |
Parent |
330429 |
Oct 1994 |
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