摘要:
A casting machine comprises a pair of travelling block mold assemblies (22) each having a plurality of block mold members (23) endlessly connected to one another to define a cavity (27), and a mechanism for driving the block mold members (23) such that the block mold members of one travelling block mold assembly (22) move in synchronism with those of the other in a casting direction. Latticed grooves (25, 34, 35, 36) are form on at least an area of the inner wall of each of the block mold members (23) which combine with one another to form the cavity (27). Delays in the solidification of molten steel in the cavity (27) are intentionally caused by these grooves, with the result that the concentration of contraction stress caused by the solidification delays at those seams (3) along which the adjacent block mold members (23) are connected to each other to form the cavity (27) can thus be reduced to prevent the creation of cracks on surfaces of cast products.
摘要:
This invention concerns a sintered article for a sheath in an apparatus for continuous casting of a thin sheet and a sheath using the sintered article. The sintered article comprises boron nitride, zirconium oxide, and at least one member selected from the group consisting of aluminum nitride and aluminum borate and combines resistance to thermal shock, lubricity, and strength. The sheath is formed of the sintered article and, therefore, enjoys the prominent properties of the sintered article.
摘要:
A shield excavator (4) is mounted in a seal body (9) which is rotatably mounted in a cylindrical skin plate (5) supported by a shield frame (8). A shaft (1) is excavated by propelling the shield frame (8) downwards and the seal body (9) is then pivoted in the skin plate (5) to orient the shield excavator (4) substantially horizontally and the shield excavator (4)is then propelled through an opening (26) in the side of the skin plate to excavate a tunnel (2).
摘要:
A parison head for use in a multi-layer blow moulding machine comprises a head body (1), a core (2) within the head body, a mandrel (4) at one end of the core which, together with the head body, defines an annular extrusion slit (6), a plurality of annular accumulator spaces (7-11) concentric with the core and a plurality of annular passages (12-16), each connecting one end of respective accumulator space with the extrusion slit. At least one of the passages (12-16) includes an annular valve (47) which normally closes the passage but is arranged to be opened when the pressure of the feed material in the associated passage exceeds a predetermined value.
摘要:
A flotation machine for de-inking waste paper stock comprises a horizontally extending flotation cell (5) defining a reservoir for a stock liquid which forms a free liquid surface in the cell. A froth receptacle (4) extends along the entire length of the cell and receives froth floating up to the liquid surface. At opposite ends of the cell are a stock inlet (1) and a stock outlet (2). Situated within the lower portion of the cell is a rotary air bubble generator (3) which extends between the two ends of the cell with its axis of rotation extending generally horizontally whereby stock liquid introduced through the inlet (1) flows along the length of the cell towards the outlet (2) in at least one spiral flow pattern (11) with a generally horizontal axis.
摘要:
A cooling tower includes a supporting framework (11) comprising interconnected vertical columns (12) of hollow tubular construction, horizontal beams (13) of solid construction and inclined braces (14) of hollow tubular construction, all of which are made of fibre reinforced plastic material.