摘要:
An agitation device, a melting apparatus, and a melting method for improving melting efficiency of molten metal without contaminating the same. The agitation device is provided with a traveling magnetic field generating unit which is disposed outside a charging tank for storing molten metal and generates, inside the charging tank, a magnetic field that travels downward along the rear sidewall of the charging tank. A flow of the molten metal that rotates longitudinally about an axis approximately parallel to the surface of the molten metal is produced in the molten metal. By charging aluminum cutting chips into the molten metal in which the flow is produced, the aluminum cutting chips move with a downward flow of the molten metal, and are immersed in the molten metal. As a result, melting of the aluminum cutting chips can be accelerated.
摘要:
Provided are an agitation device, a melting apparatus, and a melting method which achieve good melting efficiency without contaminating molten metal. The agitation device is provided with a traveling magnetic field generating unit which is disposed outside a charging tank for storing molten metal and generates, inside the charging tank, a magnetic field that travels downward along the rear sidewall of the charging tank, whereby a flow of the molten metal that rotates longitudinally about an axis approximately parallel to the surface of the molten metal is produced in the molten metal. By charging aluminum cutting chips into the molten metal in which the flow is produced, the aluminum cutting chips move with the flow of the molten metal, get into the molten metal roughly in the position where a downward flow of the molten metal is produced, and are immersed in the molten metal, and thus the melting of the aluminum cutting chips is accelerated.
摘要:
In a molding machine, a fixed platen which supports a fixed die is disposed on one end of a base plate. A movable platen which supports a movable die and a supporting mount which supports each one end portion of the four tie bars are mounted on slide units. The movable platen and the supporting mount are advanced so as to close the die, a tip portion of each tie bar is locked to the fixed platen by a lock mechanism, and a die clamping cylinder provided on the movable platen is actuated to generate a clamping force so as to execute molding. After that, the lock mechanism executes an unlocking operation so as to cause the movable platen and the supporting mount to retreat to a die open position. Furthermore, an attaching and detaching mechanism releases the die clamping cylinder so as to cause only the supporting mount to significantly retreat from the movable platen, and thus the four tie bars are completely evacuated from the fixed die and the movable die.
摘要:
A roof mounted light transmitting frame has a pair of longitudinal sash members. A light-transmitting sheet support sash member is mounted obliquely along the inner surface of each longitudinal sash member such that the distance between its front end and the lower edge of the longitudinal sash member is larger than the distance between its rear end and the lower edge of the longitudinal sash member. A lower horizontal sash member with a vertical support member is mounted between front ends of the light-transmitting sheet support sash members. An upper horizontal sash member is mounted between rear ends of the light-transmitting sheet support sash members. A light-transmitting sheet is mounted between the light-transmitting sheet support sash members, and the upper and lower horizontal sash members. A recess is longitudinally formed on the lower horizontal sash member to receive an upper horizontal sash member of the next frame.
摘要:
A roof system utilizing a solar cell comprising a first modular roof member composed of a plurality of first light collecting plate segments each of which having a solar cell embedded therein, the first light collecting plate segments being aligned in one direction and in the other direction perpendicular to the one direction; and a second modular roof member composed of a plurality of second light collecting plate segments each of which is equal in size to the first light collecting plate segment, the second light collecting plate segments being aligned in one direction and in the other direction perpendicular to the one direction, the number of the second light collecting plate segments in one direction being larger by one than that of the first light collecting plate segments.
摘要:
An optical encoder includes: an optical scale having periodical optical patterns and can be relatively and angularly displaced; a projector for irradiating the optical scale with light; a light receiver for receiving light from the optical scale; and a calculator for calculating an absolute rotation angle θ of the optical scale in accordance with a signal from the light receiver. The optical patterns include a plurality of light shielding portions and a plurality of light transmitting portions, each of the portions being located alternately. When a pitch of an n-th light shielding portion in a predetermined circumferential direction is denoted by Pn and a width of the n-th light shielding portion is denoted by Wn, a transmissivity T(θn) corresponding to an angle θn of the n-th light shielding portion and the pitch Pn of the light shielding portion satisfy predetermined equations, and the width Wn of the light shielding portion in the optical pattern varies in accordance with a function of the pitch Pn of the light shielding portion.
摘要:
A method determining a malfunction when a reception signal fluctuates at a receiver owing to malfunctions occurring on a leaky cable and its related devices. The method determines, among range bins correlating the reception signal with a distance from a feed end of a radio-wave radiation unit and a radio-wave reception unit, based on a correlation between a time-delay from a transmission time of a transmission signal until a reception time of the reception signal and a transmission path distance of the reception signal in the radio-wave radiation unit and the radio-wave reception unit, when, comparing the reception signal with the transmission signal with respect to the range bin corresponding to a far end, a level of amplitude reduction in the reception signal exceeds a predetermined ratio, that a malfunction is present in either the radio-wave radiation unit or radio-wave reception unit.
摘要:
A target-closing phase-map generating section generates in advance a target closing phase map in consideration of a pre-arc characteristic and variations of a mechanical action of a breaker, and amplitude fluctuations of the load voltage. A target-closing time calculating section calculates a target closing time string from frequencies and phases of the power source voltage and the load voltage, respectively, of the breaker referring to the target closing phase map. A closing control section, when a close command 11 is inputted, controls the timing of outputting a closing control signal based on a predicted closing time and the target closing time string.
摘要:
A residual magnetic flux measurement apparatus measures residual magnetic fluxes by using a transformer-voltage measurement means for measuring transformer voltages; a voltage delay means for delaying the measured signals; a DC-voltage-component calculation means for calculating DC voltage components from the latest transformer-voltage signals for a predetermined time period based on calculation-control signals; a voltage integration means for calculating voltage-integration signals by performing voltage integration of signals obtained after separating the DC voltage components from present transformer-voltage signals; a magnetic-flux DC-component calculation means for calculating magnetic-flux DC-components from the latest voltage-integration signals for a predetermined time period based on the calculation-control signals; a magnetic flux calculation means for obtaining magnetic flux signals in which the magnetic-flux DC-components are separated from present voltage-integration signals; and a control means for obtaining residual magnetic fluxes based on contact signals, an interruption mode, the transformer-voltage signals, and the magnetic flux signals.
摘要:
A closing phase that produces the smallest energization flux error at a connection input point is calculated based upon a residual flux of the first closing phase and the preliminarily given pre-arc characteristic and closing time deviation characteristic of a three-phase circuit breaker, so that the calculated phase value is set as a target closing phase of the first closing phase. A closing phase that produces the smallest energization flux error when a residual flux of zero is calculated, so that the calculated phase value is set as a target closing phase of the remaining two phases. The total time required from the reference point to the target closing phases of the remaining two phases and a delay time corresponding to an integer multiple of a given cycle of the three-phase power supply is set as a target closing time of the remaining two phases.