Patent GB-436222-A (GB)
Title: Improvements in or relating to machines for pickling, scrubbing and swilling metal plates
IPC: C23G3/00
Filed: 1934-04-03
Abstract: 436,222. Pickling and swilling metal plates. DAVIES ALEXANDER ENGINEERING WORKS, Ltd., S., and DAVIES, S., Baglan Road, Briton Ferry, Glamorgan. April 3, 1934, No. 10086. [Class 82 (ii)] Metal plates, e.g. plates which are subsequently to be swilled and coated with tin, terne, &c., are pickled singly and in succession in a pickling vat provided with a plate carrier which is adjustable to suit the length of plates, means for jigging the carrier, and plate-discharge means which are adapted to remove the plate from the carrier after the latter has performed several jigging movements and which are adjustable so that the plates may be discharged from the vat at substantially equal intervals or distances apart for all lengths of plates. The plates after leaving the vat are preferably passed in succession through a swilling bath comprising one or more sets of forwarding rolls and one or more sets of cleaning rolls which rotate at a different peripheral speed from the forwarding rolls. The apparatus shown in Fig. 1 consists of a feeding device B, a pickling device A, and a swilling device C, the apparatus being constructed to take two lines of plates. The feeding device for each line of plates comprises a fly frame 5 mounted on a spindle 7 directly geared to the spindle carrying the other fly frame and operated by crank and linkage mechanism 10, 11, 12, and a feed belt 6. The fly frame, to which the plates are fed singly by hand, consists of two spaced arms 18, a stop member 19, and guide ears 20, the arms and stop member being disposed so that the frame on its downward movement deposits the plate on the belt 6. The plate is passed by the belt, preferably through rollers 21, to guides 16, 17 which deliver it into a plate carrier g in the pickling vat a. The plate carrier g, which is formed of a U-shaped metal strip with a straight bottom provided with a series of plate rests h, Figs. 2, 3, 4 and 8, is adjustably mounted by means of a series of holes or pegs i on two levers k mounted on pivots l, each of the levers k having two other arms one of which is acted on by a multi-lobe cam m to cause the jigging movement of the carrier. The cam depresses the carrier which is returned by the action of springs or weights p on the third arm of the levers. The plate passes from the guide 17 on to the plate carrier and is held upright during the jigging movement by a roll x and spaced bars 2. It is removed from the carrier by pressure shoes u carried by bow springs v mounted on a spindle w, which on rotation of the spindle w pass between the bars 2 and co-operate with the roll x to raise the plate to the nip of discharge rolls n, r, the roll r being pressed against the roll n by springs or weights. The spindle w is provided with toothed segments y which engage with a wheel z on the spindle of the roll x so that this roll is rotated when a pressure shoe comes into contact with the plate. Alternatively the segments y may be replaced by a toothed wheel so that the roll x is continuously rotated. In an alternative method of raising the plates, Fig. 8, the bars 2 are replaced by one or more metal plates 65 which are vertically movable and may be perforated. A guide bar 67 for the plates 65 may be provided. The pressure shoes engage these plates and these plates and the plates under treatment rise together until the latter plates enter the nip of the rolls n, r. The plate carrier and the pick-up device are mounted on a framework which rests on the side walls of the vat and can be removed as a whole, and for this purpose the spindle w is connected to its driving shaft 13 by a coupling 32 comprising a member 33 of bar form on the shaft 13 which enters a recess in a companion member 34 on the spindle w. The plate is passed by the rolls n r to guide members 3 and 4 which lead it to the swilling device C, which comprises a bath 36 containing a pair of rubber-faced forwarding rolls 37, two pairs of cleaning rolls 38 and 39 faced with cork &c. water sprays 57, and discharge rolls 58. The rolls 37 preferably rotate at a greater peripheral speed than the rolls 38, and the rolls 39 at greater peripheral speed than the rolls 37. The rolls 38 are driven from the main driving shaft 23 which also carries a sprocket 24 from which a chain 25 passes to a changewheel sprocket 27 on the spindle of the discharge roll n of the pickling device. From this spindle the spindle w of the pick-up device and the feed belts are driven. By using sprockets 27 of different diameters and adjusting the length of the plate carrier so that the top edge of the plate is the same distance from the rolls n r the distance between plates as they emerge from the pickling vat can be maintained approximately the same for different lengths of plates. The plates may finally be passed to a tinning machine such as that described in Specification 436,007.