Pulp-digester screen cleaner

Abstract

A pulp-digester screen cleaner having a pneumatic actuator with a cylinder and a rod coaxially disposed within the cylinder. An actuator mounting plate is used to mount the actuator outside of a pulp-digester screen housing pipe. A rod seal has a body disposed on the pipe that prevents any loss of fluid or pressure, yet allows the rod to pass into the pipe. The cylinder contains all of the mechanics of the pneumatic actuator and can be easily serviced without draining the digester. The rod is disposed through a first aperture of each of a pair of scrapers. A treated edge of each of the pair of scrapers varies to match different digester screen types and patterns. The present pulp-digester screen cleaner eliminates the need for chemical cleaning or other mechanical cleaning solutions. It will also improve pulp quality, increase pulp production, and promote overall digester efficiency.

Claims

1. A pulp-digester screen cleaner comprising: a pneumatic actuator having a cylinder and a rod that is movable and coaxially disposed within said cylinder; a pair of scrapers, wherein each of the pair of scrapers has a length, a width, a top, a bottom, a straight edge, a treated edge, and a first aperture, wherein the first aperture is medially disposed along the length proximal the straight edge, wherein the rod is disposed through the first aperture of each of the pair of scrapers, wherein one of the pair of scrapers is disposed proximal an end of the rod; a pair of scraper supports, wherein each of the pair of scraper supports has a second aperture and a pair of arms, wherein the pair of arms of one of the pair of scraper supports is disposed on the top of one of the pair of scrapers, wherein the rod is disposed through the second aperture of each of the pair of scraper supports; a rod seal having a body and a third aperture, wherein the rod is disposed through the third aperture, wherein the body is disposed on an outside of a fourth aperture, wherein the fourth aperture is disposed through a pipe of a pulp-digester, wherein the fourth aperture is disposed at a distance from a liquor screen of said pulp-digester, wherein the distance substantially conforms to the width of each of the pair of scrapers; and an actuator mounting plate; wherein the actuator mounting plate is configured to secure the actuator in place as the rod moves.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Figures

(1) FIG. 1 is an isometric view of a pulp-digester screen cleaner.

(2) FIG. 2 is an isometric view of the pulp-digester screen cleaner installed on a pulp-digester screen housing pipe.

(3) FIG. 3 is cross-sectional view of the pulp-digester screen cleaner along line 3-3 of FIG. 2.

(4) FIG. 4 is cross-sectional view of the pulp-digester screen cleaner along line 4-4 of FIG. 2.

(5) FIG. 5 is a side elevation view of a scraper.

(6) FIG. 6 is a top plan view of the scraper.

DETAILED DESCRIPTION OF THE DRAWINGS

(7) With reference now to the drawings, and in particular FIGS. 1 through 6 thereof, an example of the instant pulp-digester screen cleaner employing the principles and concepts of the present pulp-digester screen cleaner and generally designated by the reference number 10 will be described.

(8) Referring to FIGS. 1 through 6 the present the pulp-digester screen cleaner 10 is illustrated. The pulp-digester screen cleaner 10 includes a pneumatic actuator 12 having a cylinder 14 and a rod 16 coaxially disposed within said cylinder. An actuator mounting plate 18 is used to mount the actuator outside of a pulp-digester screen housing pipe 20, and to secure the actuator in place as the rod moves. The rod is disposed through a third aperture 22 of a road seal 24, and then through a fourth aperture 26 in the pulp-digester pipe. The rod seal has a body 28 disposed on the pipe that prevents any loss of fluid or pressure, yet allows the rod to travel freely as driven by the cylinder. The fourth aperture is disposed a distance 30 from a liquor screen 32 of the pulp-digester. The distance substantially conforms to a width 34 of each of a pair of scrapers 36.

(9) Each of the pair of scrapers has a length 38, the width 34, a top 40, a bottom 42, a straight edge 44, a treated edge 46, and a first aperture 48. The first aperture is medially disposed along the length proximal the straight edge, and the rod is disposed through the first aperture of each of the pair of scrapers. One of the pair of scrapers is disposed proximal an end 50 of the rod. The scrapers are further reinforced by a pair of scraper supports 52. Each of the pair of scraper supports has a second aperture 54 and a pair of arms 56. The pair of arms of one of the pair of scraper supports is disposed on the top of one of the pair of scrapers, and the rod is disposed through the second aperture of each of the pair of scraper supports.