Briquetting Tests of Lignite at Pittsburgh, Pennsylvania, 1908-9 : With a Chapter on Sulphite-Pitch Binder Page: 15
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BRIQUETTING PLANT AT PITTSBURG.
terials to which a binder has been added, and attempts to use a similar
press for briquetting materials containing artificial binder will prob-
ably result in a stalled machine or a broken stamp.
The machine is of the open-mold type, and the material pressed
passes through the mold. In its passage the material is reduced in
volume, because the opening in the delivery end of the mold is
smaller than the one in the receiving end. This difference in size
of the two openings is shown by the vertical sections through the
mold given in figure 4, the vertical height being greater at a than
at b. The dimensions given in the figures are in millimeters.
A charge of the prepared material sufficient for one briquet enters
the mold at C, is pressed by the stamp E into the end of the mold and
is pushed along to D, the end of the travel of the stamp E. The
stamp moves back, and then presses another charge to D. The first
charge is forced along under heavy pressure in the direction of the
Steel D hook
C steel 80 Chilled cast iron
LONGITUDINAL VERTICAL SECTION THROUGH MIDDLE OF MOLD
4 165l 1 20 SECTION A-B
Scale of inches
FIGUREI 4.-Vertical sections through mold box of lignite-briquetting press; dimensions
are in millimeters.
arrow until it reaches a; as it passes from a to b, in what is called the
die angle, it is compressed at top and bottom by the reduction in
height of the mold. From b the briquet is forced along by the suc-
cessive charges of material and its sides are hardened and polished.
When it leaves the mold at F, the briquet is hot, but after it has
traveled in a trough for a few feet from the machine it is ready for
storage or loading into cars. The press L (fig. 1) is directly con-
nected to the steam engine M. The stamp E (fig. 4) is bolted to a
sliding headblock that is actuated by a connecting rod and eccentric.
The throw of the eccentric is 7 inches.
ENGLISH MACHINE.
The English machine,a shown in Plate V, consists of a heating and
mixing chamber of cylindrical shape; a die-filling box, also of cylin-
drical shape; a die-filling plunger; a vertical die plate: and double-
a For a detailed description of the English machine, see U. S. Geol. Survey Bull. 385, pp.
12-14.15
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Wright, Charles L. Briquetting Tests of Lignite at Pittsburgh, Pennsylvania, 1908-9 : With a Chapter on Sulphite-Pitch Binder, report, 1912; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12842/m1/21/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.