. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 669 descending motion being given by the press plungers, H H. advancing toward each other andforcino- the contents of the pump cylinder into the press cylinder, the ascending motiontakint^place by means of the steam-piston, which, on the return stroke, raises the ram, andforcesthe water back on to the pump plungers as they recede from each other; so that asIon as there is no waste of water by leakage, and its quanti
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 669 descending motion being given by the press plungers, H H. advancing toward each other andforcino- the contents of the pump cylinder into the press cylinder, the ascending motiontakint^place by means of the steam-piston, which, on the return stroke, raises the ram, andforcesthe water back on to the pump plungers as they recede from each other; so that asIon as there is no waste of water by leakage, and its quantity is not increased or decreased,thepress ram will continue to oscillate at the same distance from the anvil, and could onlyoperate on work of that exact size. The ram has therefore to be raised or lowered to suit thevarious requirements of work in hand, and to effect this a source of supply of water under apressure of about 250 lbs. has to be providetb which, when admitted into the press cylinder,has Sufficient force to overcome the power of the steam in the steam-cylinder, sending thesteam back into the boilers. By this means the ram is rapidly brought down any required. Figs. 1 and 2.—Hydranlic forging press. distance; on the other hand, the power of the steam immediately raises the ram upon thewater being allowed to escape. , » +i The valve used for the rapid admission and escape of water becomes, theretore, rather animportant feature, and is shown in Fig. 2. It consists of a cylindrical facmg, having ahollow cvlindrical valve or plunger, working endwise through hydraulic leathers ; at eachend of tliis valve or plunger verv fine slits are sawn lengthwise through its sides or walls, forallowing of the admission and escape of water, by moving the valve endwise until the hueslits pass the hvdraulic leather ; the set of slits at one end of the valve being for the admis-sion of water, and those at the other for the escape. L is the casing bored through andfitted with hvdrauli
Size: 2150px × 1162px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
