摘要:
PROBLEM TO BE SOLVED: To provide a removing method of deposit on a lance for refining molten metal with which the stuck material on the lance can be removed at quicker and more theoretical than these of the conventional method, and a device therefor. SOLUTION: At the time of removing the deposit on the lance 5 for refining the molten metal, disposed so as to be freely elevated/lowered at the upper part of a refining vessel 8 for holding the molten metal 10 in order to inject gas for refining and/or refining agent on/into the molten metal, during shifting the lance 5 from the using position to the waiting position after completing the refining, gaseous oxygen is jetted onto the outer peripheral surface of the lance to melt and remove the deposit. Further, immediately, a stuck material releasing agent is jetted to form the film of the deposit releasing agent on the outer peripheral surface. COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To efficiently remove carbon or the like adhered onto the inside of equalizing port metals. SOLUTION: A cylinder 14 for advance and retreat movement which is displaceable upward and downward is supported on a frame 12 which is displaceable right and left by a cylinder 11 for traverse movement through a cylinder 13 for ascent and descent movement, and a washing nozzle 16 is mounted on the tip of a rod 14a of the cylinder 14 for advance and retreat movement through a hydraulic motor for rotation. The cylinder 11 is fixed on the side of a base 20. The washing nozzle 16 is connected to the side of discharging high pressure water of a high pressure water pump 18 through a pressure-resistant tube 17. In washing by the washing apparatus 10, at first, the cylinder 11 for traverse movement and the cylinder 13 for ascend and descend movement are driven to make the washing nozzle 16 face the equal mouthpiece 2, and by driving the cylinder 14 for advance and retreat movement, the washing nozzle 16 is inserted into the inside of the equalizing port metal 2. Then, while jetting high pressure water, the washing nozzle 16 is moved at a predetermined speed along the edge of a frame body 2a.
摘要:
PROBLEM TO BE SOLVED: To set a gap accurately without changing the gap amount, even if there is the accidental temperature change of the spindle mounting a round edge. SOLUTION: In the trimming device of a band steel for cutting the ear of the band steel 1 by shearing edges 2 mounted on the upper/lower spindles supported by a fixed bearing 8, the distance from an edge surface to the fixed bearing or further the distance from the fixed bearing to the end of the spindle is same at the upper/lower parts (TL1=BL1, further TL2=BL2). COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To provide an impeder for manufacturing a welded tube capable of improving the service life of the impeder and productivity of an welded tube more than the conventional products. SOLUTION: In an impeder consisting of a laminated silicon steel plate 9 as an impeder core, which is used in the case of manufacturing an welded tube by pressurizing an open seam part of a skelp 1 formed in a tubular shape with a squeezing roll while supplying a medium frequency current into a work coil 2, one part of the silicon steel plate right under the work coil is composed of a pressed powder magnetic core 10 manufactured by sintering α-iron power 11 which is coating-processed by ferrite 12. COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To control the cooling capacity of a secondary cooling zone over a wide range without degrading a casting speed by changing a cooling water temp. according to a specific relation in such a manner that a desired coefft. of heat transfer may be obtd. SOLUTION: The cooling water temp. is changed in accordance with the equation, α∝1-(β0+γ×logWd)×δTw. In the equation, Wd is a water volume density; ΔTw is a temp. difference from a reference water temp. Tw0; β0 is a reference value of an influence coeffe. β indicating the influence degree of the cooling water temp. Tw; γ is the inclination of the influence coefft. β. More preferably, the cooling water temp. Tw is lowered down to the degree appropriate for the improved component of the cooling capacity and is used for cooling when the strong cooling is executed in a method for controlling a secondary cooling zone. When the slow cooling is executed, the cooling water temp. Tw is made higher than the reference temp. Tw0 to the extent appropriate for the decrease component of the cooling capacity. As a result, the internal rack and surface crack of the slab are prevented and the good slab is obtd. without the hindrance of productivity. COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To easily detect the rotating state of guide rolls even during pouring and to exactly detect rotation abnormality by providing the desired guide rolls with rotation detecting mechanisms for directly detecting the presence or absence of the rotation thereof. SOLUTION: The rotation detectors 14a to 15d are connected to the guide rolls 4a to 4d and 5a to 5d. The analog voltage signals meeting the rotating speeds are outputted therefrom and the analog voltage signals selected by a multiplier 21 are converted by an A/D converter 22 to digital signals which are inputted to a microcomputer 20. Electric motors 6A, 6B for driving pinch rolls 7A, 7B are controlled in motor current (i) by a motor drive circuit 25. The motor current i detected by a CT type current sensor 26 is inputted via an A/D converter 27 to the microcomputer 20. The microcomputer 20 monitors the rotation of the guide rolls 4, 5 and emits an alarm signal to an alarm circuit 23 and emits a guide roll number display signal to a display 24 in the event of the occurrence of non-rotation abnormality.
摘要:
PROBLEM TO BE SOLVED: To facilitate lifting coils with tongs by easily inverting plural steel plate coils from an up end state to a down end state after superposing and packing them. SOLUTION: In this packing method, a turning body 4 having a cylindrical outer peripheral surface is turnably supported on a frame 1 in the last end of a packing line, and a steel plate coil inverting device wherein a steel plate coil transporting part 10 where a driving conveyer 12 or the like is disposed via a notch becoming a tong inserting space and a steel plate coil placeing part which extends in the direction orthogonal to the steel plate coil transporting part 10 are disposed in the turning body 4, a packed coil which is transported in the up end state is transported to the steel plate coil placing part side with a driving conveyer 12 or the like in a carrying-in position wherein the steel plate coil transporting part 10 is horizontalized, next the turning body 4 is turned 90 degrees. Thus, the packed coil is placed on the steel plate coil placing part in a down end state, tongs are inserted into the packed coil through the tong inserting space in this state, and whereby the packed coil is lifted. COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To provide a means which feeds a satisfactory lubricating liquid to a part where steel plates within a coil are rubbed together each other and washes away foreign matter such as scales at the time of recoiling a steel plate coil. SOLUTION: In this device, at the time of recoiling a steel plate coil 1, a lubricating liquid is injected toward a section wherein the pulling part 3 of the steel plate coil 1 advances upward or in the horizontal direction and moreover on the surface wherein it faces the steel plate coil 1 in the vicinity of the pulling part 3, and the steel plate coil is recoiled. Also, a lubricating liquid injection device 6 which injects a lubricating liquid toward the surface in the vicinity of the pulling part 3 wherein the pulling part 3 faces the steel plate coil 1 is provided in a steel plate coil recoiling device which pulls an outermost layer part as the pulling part 3 in the horizontal direction or upward from the steel plate coil 1. COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To prevent slack between a downstream side coiling device and a upstream side coiling device after the tail end of a strip which is coiled with the downstream side coiling device runs past an upper side coiling pinch roll at the time of switching the strip from the downstream side coiling device to the upstream side coiling device. SOLUTION: In this controlling method, a strip which is sent out of a hot finishing mill is cut into a prescribed length with a strip shear 2, and cut strips are alternately coiled with plural coiling device 4, 1 via coiling pinch rolls 3, 5. In such a case, the relation among a target speed V p1 of the downstream side coiling pinch roll 3, a target speed V p2 of the upstream side coiling pinch roll 5, a target plate speed V s of the strip S 1 just before cutting and a set coiling speed V m of the coiling device at the time when the tail end of the strip S 1 which is coiled onto the coiling device 4 via the coiling pinch roll 3 in the downstream side is cut with the strip shear 2 is specified to V m > V p1 >V p2 >V s . COPYRIGHT: (C)1999,JPO
摘要:
PROBLEM TO BE SOLVED: To prevent the oil which is collected on a pressure block from scattering even when the pressure block is hitted with a screw during roll changing. SOLUTION: In this device, a material 4 to be reduced is reduced by bringing the top end of the screw 6 held by a nut fixed to a housing into contact with the pressure block 9 fixed to the material 4 in the housing. In such a case, the pressure block 9 and screw 6 are abutted on each other by the contact area of ≤20% of the cross-sectional area of the shaft part 6b of the screw 6, or grooves for discharging the oil are provided on the opposite side to the screw of the pressure block 9. COPYRIGHT: (C)1999,JPO