Abstract A liner for a double-worm or double-screw extruder housing having a longitudinal passage having the configuration of a pair of parallel intersecting cylindrical bores having a common chord or secant plane is formed of a pair of mirror symmetrical parallel cylindrical segmental tubes joined along a common chord plane constituting a symmetry plane parallel to the segment axes. The tube segments are butt-welded together at this chord plane and are formed with outwardly open notches at this chord in which the tubes are further joined together by fillet welds, i.e. deposits of weldment (deposit welds). The notches of the segments are disposed opposite one another and are longitudinally spaced apart by distances approximately equal to their longitudinal widths. On opposite sides of the liner the notches are staggered, i.e. where a pair of notches are formed in one transverse plane on one side of the liner, the other side has unnotched abutting faces and vice versa.
An housing for a double-worm extruder comprising: an outer casing formed with a longitudinal passage having the shape of a pair of intersecting parallel cylinders; and an internally faced liner snugly received in said passage by thermally fitting said liner into said casing, said liner including: a pair of complementary internally faced tube segments joined together along a common chord plane at two opposite seams longitudinally extending along said liner, said internally faced segments having juxtaposed plaNar surfaces abutting one another and of full thickness in spaced relation along said seams, said segments being formed externally at said chord plane with longitudinally spaced notches alternating with said abutting surfaces of full thickness and defining abutting regions of reduced thickness, and a fillet weldment in each of said notches, said notches to the one side of said liner being staggered relative to the notches on the other side, said notches being spaced longitudinally apart by a distance generally equal to their longitudinal lengths, the notches being formed by angularly adjoining bevels at the outer edges of the respective abutting surfaces.
Claim 2
Dependent Claim
179 words
An housing for a double-worm extruder comprising: an outer casing formed with a longitudinal passage having the shape of a pair of intersecting parallel cylinders; and an internally faced liner snugly received in said passage by thermally fitting said liner into said casing, said liner including: a pair of complementary internally faced tube segments joined together along a common chord plane at two opposite seams longitudinally extending along said liner, said internally faced segments having juxtaposed plaNar surfaces abutting one another and of full thickness in spaced relation along said seams, said segments being formed externally at said chord plane with longitudinally spaced notches alternating with said abutting surfaces of full thickness and defining abutting regions of reduced thickness, and a fillet weldment in each of said notches, said notches to the one side of said liner being staggered relative to the notches on the other side, said notches being spaced longitudinally apart by a distance generally equal to their longitudinal lengths, the notches being formed by angularly adjoining bevels at the outer edges of the respective abutting surfaces.
Claim 3
Dependent Claim
30 words
The housing defined in claim 1 wherein said bevels lie at an angle of substantially 135* to said plane, said notch thereby having sides defining an angle of substantially 90*.