Patent GB-498005-A (GB)
Title: Improvements in or relating to apparatus for baking radiator cores
IPC: B60J1/14
Filed: 1937-04-29
Abstract: 498,005. Making radiator cores. MUNCH, H. S., and BOERGER, M. G. April 29, 1937, No. 24783/38. Convention date, Sept. 16,1936. Divided out of 497,927. [Classes 83 (ii) and 83 (iv)] In the manufacture of radiator cores applicable also to other articles with thin walled tubes and thin metal fins attached thereto, the cores are lowered and raised from an acid bath, drained, loaded on to a conveyer and carried into the oven. The dipping mechanism is started manually and automatic means are employed for the core lifting and conveying means. As shown in Figs. 1, 1a, 3 and 3a the side edges of the core are engaged by fixed and movable pressure plates 65, 66 respectively the former being adjustable through a screw 73 and the latter which is also adjustable being moved to and from the work by a pressure cylinder 75. The cores are raised up to a position between the plates by an elevator table 85 connected to a rod of a piston working in a cylinder 89. Shafts 101 are rocked to effect lifting and lowering of a pair of tracks 96 between a loading station D and the oven and a pair of tracks between the oven and squaring station. Rocking is effected by a hydraulic cylinder 103. On the tracks is a fabricated structure or carriage 110 reciprocated by a hydraulic cylinder 115. A bar 118 with pairs of cams 119 move with the carriage to actuate the plunger of a valve unit 120 to slow down the speed of the carriage near the end of the travel. The rising of the carriage to enable the feed of a core into the oven also lifts a baked core and it is conveyed to the squaring device. An acid bath adjacent to the loading station receives the cores which are dipped therein by a frame mounted to descend or rise under the action of a hydraulic cylinder The frame is pivoted and is tilted for draining away the acid. Its return to a horizontal position is sudden and jars the frame to shake more acid from the core. A control system for the dipping is provided and also an automatic control for the conveyor shutting and opening of the oven doors and for the operation of the squaring device. The oven A consists of a lower part 6 and a hooded part 8 connected to a recirculating duct 9, the various parts being insulated. The oven doors are interconnected, move vertically on rails and are operated through the medium of meshing segments 16 connected to levers 17 pivoted on trunnions 18 on the doors. A hydraulic cylinder 21 piston 20 and lever 19 transmit movement to the meshing segments. The oven is of convector type and is described in Specification 497,927 and has a heating unit 40 from which hot gases provide heating medium. The flame from a burner 42 projects into an elongated channel 41. A blower 43 is provided and some of the burnt and spent gases are vented through an exhaust port at the top of the circulatory system. Cores after removal from the oven pass to a squaring unit, which is directly in the rear so that straightening and squaring takes place before the solder has set. During the straightening and squaring operation, the front and rear edges of the core respectively engage a stationary plate, not shown, and a movable plate 58, which latter is pressed against the core by a cross-head 57 actuated from a hydraulic cylinder 60. To adjust for different core sizes a hand crank operated shaft 62 is screw-threaded to engage a nut 64 on a carrier member 59, on which the cylinder is mounted.. In operation, with a main switch 155, Figs. 9 and 10, closed, and switches controlling a blower and pump motor closed, and heating means in operation, a core is deposited on the dipping frame. A lever 147 of a valve 146 is moved to full position. Oil under pressure flows from a pipe 200, through the valve to pipe 201 leading to the top of a cylinder 133 lowering piston therein to dip the frame into the acid bath. Oil underneath piston is forced through a pipe 202 having a speed control valve 152 and through a valve 146 to the exhaust pipe 203<1>. At the bottom of piston stroke a cam 204 presses in a spring pressed plunger 153 to reverse the pressure in the cylinder 133 through the valve 146 being shifted by pressure in a pipe 199, the arm 147 moving to dotted position. Thereby the core is brought up out of its acid bath and held in an inclined position until a marginal lever is operated, allowing the frame to assume a horizontal position for the core to be slid to loading position for conveying to oven. The conveyer tracks are lowered, the carriage is moved back to loading position, a switch is closed and solenoid 159 energized to pull plunger of a valve 165. Thereby the oven doors are closed and a core is lifted at the squaring device into clamping position. The pressure in cylinders 21, 89 is obtained from a pipe 200 one branch of which enters a valve 165 after passing a check valve, and continues to pipe 205, cylinders 21, lower end of cylinder 89 and cylinders 60 and 75 of the squaring device. A switch 160 is closed when the piston of the cylinder 21 has retracted. A timer 156 func. tions to determine the length of baking period, and at the end a solenoid 158 is energized to move the plunger of the valve to the left. Fluid pressure in a pipe 206 is imposed on cylinders 60 and 75 of the straightening device. The core is now released for moving down on to its supports for conveying, and the oven doors are opened by the piston of the cylinder 21. When the core is positioned in the oven and a baked core deposited for squaring the plunger of a valve 169 is depressed and thereby the plungers of valves .167, 168 are moved to the right by pressure from pipe line 200. When the plunger valves 167, 168 are readjusted the plunger of valve 166 is moved to left and conveyer tracks are lowered and carriage retracted.