Patent GB-604797-A (GB)
Title: Improvements in or relating to apparatus and process for centrifugally lining hollow cylinders
IPC: B05C1/02
Filed: 1945-12-04
Abstract: <PICT:0604797/III/1> <PICT:0604797/III/2> Apparatus for centrifugally lining hollow <PICT:0604797/III/3> <PICT:0604797/III/4> <PICT:0604797/III/5> cylinders comprises a hollow jacket with a runner ring at each end for revolvably mounting the jacket on rollers, end rings carried by said jacket for engaging the ends of the cylinder, a girth ring encircling said hollow cylinder intermediate its length, and means carried by said jacket for steadying the cylinder during rotation, these means being adapted to be displaced into engaging relationship with said girth ring.  The jacket of the apparatus is mounted on two pairs of rollers, one pair at each end of the jacket.  Referring to Fig. 2, a sleeve 17 to be lined has joint rings 18 and 19 welded to each end.  Joint ring 18 has a gasket receiving recess 20.  Ring 23 fits around sleeve 17 and ring 18 forms a seal with gasket 27 while ring 24 with gasket 30 seals the opposite joint.  To correct irregularities between the concentricity of the cylinder and the jacket, girth bands such as 35 are employed.  Each girth ring consists of two parts 36 and 37, Fig. 4, pinned together by bolt and pin 39 and is formed of bands of metal 40 and 41 to which are attached heavy bars 42 and 43. The jacket comprises a sleeve 48 secured at its ends to rings 49 and 50 having cylindrical surfaces 51 and 52 which engage the rollers of the apparatus so as to rotate the pipe.  Eccentricity of the girth rings with respect to the jacket is corrected by engaging devices 47 spaced circumferentially around the jacket by means of which screw 61 working through a hole in block 56 is tightened against, or loosened from, girth ring bars 42 and 43. The sleeve 48 may be stiffened with stiffener rings 55 and by strips of metal.  Dogs 69 fastened to runner ring 49 hold ring 23 tightly against ring 18, and extension 36 determines the thickness of the lining.  To prevent axial displacement of the pipe relative to the jacket, dogs 73 bear against ring 24.  Each dog is fixed to the end of a threaded rod 74 and is drawn into tight engagement with ring 24 by nut 75 and locknut 76.  A heavy finger 78 prevents dog 73 from turning during the centrifuging action.  In a modification, Fig. 6, the demountable end rings 82 and 83 are so fixed as to seal the ends of tube 84 and their inwardly extending legs 85 and 86 determine the length and thickness of the lining.  After the centrifuging operation the pipe is lifted from the rollers by trunnion pins and set in a vertical position with end ring 24 lowermost.  Dogs 73 and engaging devices 47 are loosened and the jacket removed.  Two short sections joined together may be treated in the jacket.  In Fig. 8, two sections 103 and 1031 are to be lined. Section 103 includes sleeve 104, spigot ring 105 and bell ring 106. Section 1031 includes sleeve 107, spigot ring 108 and bell ring 109. They are joined by welding ring 111 to spigot 108 and bell 106 and then introduced into jacket 110.  Fig. 9 illustrates the manner of lining sections with bevelled ends.  A shell 117 connected to spigot ring 118 terminating at 119 in a bevelled plane is supported by a dummy section 120 with aperture ring 121 parallel to end 119. Section 120 has a square end 125 provided with a spigot ring 125 sealed against and supported by a demountable end ring 126 of the centrifuging apparatus.