Apparatus for continuous gravimetric metering of pourable material

Patent metadata

Field	Value
Publication number	US-2021123791-A1
Application number	US-201917254192-A
Country	US
Kind code	A1
Filing date	Jun 18, 2019
Priority date	Jun 18, 2018
Publication date	Apr 29, 2021
Grant date	—

Abstract

An apparatus (1) for continuous gravimetric metering of pourable material comprises a housing (2) comprising a first and a second spaced wall (5,6), a charging port (7) through the first wall (5), and a discharging port (8) through the first wall (5) displaced from the charging port (7) and a primary air port (10) with a primary outlet opening (9) through the second wall (6) opposite to the discharging port (8). In the second wall (6) a secondary air port (12) is provided with a secondary outlet opening (11) having a substantially smaller outlet area than the primary outlet opening (9) and being displaced from the primary outlet opening in opposite direction to the rotational direction of the rotor (3) and being arranged opposite to the discharging port (8), and where the primary and secondary air ports (10,12) are connected to a compressed air supply.

First claim

1 . Apparatus for continuous gravimetric metering of pourable material, such as a fuel material, preferably comprising coal, comprising:
a housing comprising a first and a second mutually spaced wall, a charging port through said first wall, a discharging port through one of said walls displaced from said charging port and at essentially same radius as said charging port with respect to a predetermined vertical axis, a primary air port through the other wall opposite to said discharging port, said primary air port having a primary outlet opening and being connected to a compressed air supply; a rotor mounted in and sealed to said housing for rotation about said predetermined vertical axis including a plurality of pockets extending therethrough at spaced locations separated by a rotor partition wall having a thickness t, said pockets having a pocket opening front edge as seen in the rotational direction of the rotor and said pockets forming a first ring of pockets along the same radius as said charging and discharging ports, a circular measuring path being defined between the charging port and the discharging port, the pockets receiving material via the charging port and material being emitted through said discharging port during the rotation of the rotor; drive means configured for rotating said rotor in a rotational direction; speed indication and control means configured for controlling the rotational speed of said rotor; load-measuring means configured for measuring the weight of the material traveling along the measuring path characterized in that the other wall of the housing comprises a secondary air port having one or more secondary outlet openings including a first secondary outlet opening and being connected to a compressed air supply, the secondary outlet opening(s) of the secondary air port having an secondary outlet opening front edge and a total outlet area being substantially smaller than that of the primary outlet opening and being displaced from the primary outlet opening of the primary air port in opposite direction to the rotational direction of the rotor and being arranged opposite to said discharging port.

2 . Apparatus according to claim 1 , wherein the total outlet area of the secondary outlet opening(s) is 0.1% to 25%, such as 0.1% to 20%, 0.5% to 15%, 1% to 15%, 1% to 10% 1.5% to 10%, 1.5% to 7%, 2% to 7%, 3% to 5% of the outlet area of the primary outlet opening.

3 . Apparatus according to any of the preceding claims, wherein the front edge of the secondary outlet opening is displaced at least a rotational angle X min of the rotor from the primary outlet opening, X min being defined as ¼ or ⅓×(360°/number of pockets in a pocket ring)

4 . Apparatus according to any of the preceding claims, wherein the secondary outlet opening is displaced less than an angle of rotation X max of the rotor from the primary outlet opening, X max being defined as 5×(360°/number of pockets in a pocket ring).

5 . Apparatus according to any of the preceding claims, wherein the displacement of the secondary outlet opening in respect to the primary outlet opening and the thickness t of the rotor partition walls are dimensioned so that when the secondary outlet opening is completely covered by a partition wall the pocket opening front edge of a pocket opening is within the primary outlet opening as seen in a vertical projection.

6 . Apparatus according to any of the preceding claims, wherein the first secondary outlet opening of the secondary air port is oblong and extends towards the primary outlet opening of the primary port

7 . Apparatus according to any of the preceding claims, wherein the primary air port and the secondary air port are configured as a single air port being provided with two separate and mutually spaced outlet openings in the form of the primary outlet opening and the first secondary outlet opening.

8 . Apparatus according to any of the preceding claims, wherein the primary air port and the secondary air port are separate air ports, such as air ports formed by separate tubes or hoses, the air ports being optionally separated by a common port partition wall.

9 . Apparatus according to any of the preceding claims, wherein the first wall is an upper wall and the second wall is a lower wall.

10 . Apparatus according to claim 10 , wherein the discharging port is provided in the first wall, i.e. the upper wall.

Assignees

• Smidth As F L

Inventors

• Kasperek Daniel
• Hauser Armin

Classifications

• G01F11/24

  for fluent solid material · CPC title

• G01G13/026 Primary

  by mechanical conveying means, e.g. belt or vibratory conveyor · CPC title

• B65G53/4616

  with axis of turning parallel to flow · CPC title

• G01G11/083

  of the weight-belt or weigh-auger type (G01G11/10, G01G11/12 take precedence) · CPC title

• G01G13/02

  Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism · CPC title