Patent GB-1500539-A (GB)
Title: Process and installation for extracting pipes from a centrifugal casting machine
IPC: B22D29/04
Filed: 1975-06-17
Abstract: 1500539 Extracting centrifugally cast pipes from moulds PONT-A-MOUSSON SA 17 June 1975 [8 July 1974] 25671/75 Heading B3F In a method of extracting cast iron pipes from a centrifugal casting machine, extracting tongs 16 are rotatably driven at the same speed of rotation as the casting mould M both prior to their introduction into the cast pipe in the mould and throughout the extraction of the pipe from the mould. The extracting tongs are in the form of expandable jaws 16 locatable within the end of the pipe and are actuated by a control rod 17 mounted in a rotary tubular support 14. The support 14 is driven by rollers 13 which are mounted on an extractor carriage 8 traversable along a track 3. First and second pipe supporting carriages 9 and 10 respectively, are displaceably connected with the extractor carriage 8 and have support rollers 22, 25 respectively which are driven to continue the rotation of the cast pipe as it is extracted from the mould. The first carriage 9 is movable along the track 3 and the second carriage 10 is traversable along a track 4 which is parallel and within the track 3. An end portion 5 of the track 4 adjacent the casting mould is pivotable downwardly to permit clearance between the rollers 25 of the carriage 10 and the socket end of the cast pipe as extraction commences. The carriages 8, 9 and 10 are connected together by chains 37 and 28 respectively to permit limited independent movement, and a connecting rod 33 is operable between the carriage 8 and 10 to control the movement of the extractor carriage 8 to disengage the tongs and displace them from the extracted pipe. The rod 33 is slidable relative to carriage 8 and co-operates with a latch member 39 by way of an abutment 35 and a stop 44. A lifting device L is provided with powered rollers 46 to permit the extracted casting, which is being rotated, to be rotated by the rollers 46 during the lifting and transporting operation. In operation all three carriages are moved into respective positions adjacent the casting mould 1, the end of the track 4 being pivoted downward and carriage 10 is located within a recess 19 in the carriage 9 and the rollers 22 of the carriage 9 being pivoted outwardly so as to be clear of the socket end of the pipe. The extractor tongs are located within the pipe T and the carriage 8 is displaced along the track 3 and so commences to withdraw the cast pipe from the mould 1. The bar 33 is engaged by the latch 39 by abutment 35 and the chain 37, which is attached to a fork 36 at the end of the bar 33, becomes taut and pulls the carriage 9 along with the carriage 8 hydraulic means 6 being actuated to pivot the track portion 5 back to its horizontal position. The rollers 25 are now supporting the cast pipe at a position behind the socket and the second chain 28 becomes taut, the carriage 10 commences to move whilst at the same time the rollers 22 are pivoted to further support the pipe at another axially spaced position, the cast pipe being continuously rotated during these operations. As the train of carriages moves away from the mould the cast pipe becomes wholly extracted and movement continues until the latch 39 engages the stop 44 whereupon the bar 33 is disengaged and hence permits the extractor carriage to move and remove the tongs 16 from the pipe whilst the carriages 9 and 10 remain stationary. The cast pipe T which is still rotating is subsequently removed from the carriages by the lifting device L and subsequently rotated until the pipe has cooled sufficiently to retain its rigidity.