Abstract:
A laser machining apparatus includes a laser generator for generating a laser beam and a driver unit for moving the laser beam relatively with respect to a workpiece as to emit the laser beam on the workpiece. The laser beam includes plural laser pulses. The laser pulses have spots each having a longitudinal direction. The driver unit moves the laser beam in the longitudinal direction relatively with respect to the workpiece so that the spots overlap each other. This laser machining apparatus can process the workpiece at high quality and high productivity.
Abstract:
The deposit conveyance mechanism is capable of effectively conveying deposits. The mechanism comprises: a conveying tube 10 having a suction port 12, a vertical tube part 13, a horizontal tube part 14 horizontally extending sideward, the horizontal tube part 14 being held in the water so as to locate below a hydraulic gradient line and vertically moved so as to move the suction port 12 close to and away from the bottom face of the water storing place, by an elevating unit 38, in a prescribed cycle; a cup-shaped member 60 provided to the suction port 12 of the conveying tube 10, the cup-shaped member having a lower part in which the suction port 12 is capable of moving upward and downward; a steam supplying section 73 supplying steam into the cup-shaped member 60; and a compressed gas supplying section 74 supplying a compressed gas into the cup-shaped member 60.
Abstract:
In the laser beam machining apparatus, an optical sensor provided with a blue filter detects change of color of light emission from the machining spot on a workpiece irradiated by a machining laser beam from orange color light emission to blue color light emission, when laser beam intensity per area becomes above a certain level as a result of good focusing by a condenser lens; and the position of the condenser lens is controlled based on output of the optical sensor, in a manner that the optical lens lies in such a positional range that the blue color is emitted from machining spot.
Abstract:
A hot rolled steel sheet cooling apparatus includes a gradual cooling header 2 including a rod-like cooling water nozzle 3 for gradual cooling and a rapid cooling header 4 including a rod-like cooling water nozzle 5 for rapid cooling such that the headers constitute a cooling unit 9. The cooling unit 9 includes an elevating unit 7 capable of moving upward and downward in unison with the cooling unit. In cooling the upper surface of a hot rolled steel sheet (hot rolled steel strip or steel plate), uniform and stable cooling is achieved while both of high cooling rate and low cooling rate are ensured.
Abstract:
Whirl flow of leakage flow is reduced to reduce the occurrence potential of steam whirl.A rotor oscillation preventing structure for a steam turbine includes: a stator vane 3; a moving blade 1; a shroud cover 2 installed on an outer circumferential side distal end of the moving blade 1; and a plurality of seal fins 6 installed, at any interval in the axial direction of a rotor, on an wall surface of a stationary body located on an outer circumferential side of the shroud cover 2, a whirl preventing structure comprised of whirl preventing plates 9 or whirl preventing grooves 11 is provided at a shroud cover inlet return portion 10 of the shroud cover 2 so as to block the whirl flow of leakage flow 8 on an upstream side in an operating steam flow direction of the seal fins to reduce an absolute velocity component of the leakage flow 8 in a rotational direction of the rotor.
Abstract:
A powder coating is provided, comprising a particulate material having a particle distribution satisfying the following requirements:(a) the volume 50% diameter is from 7 .mu.m to 20 .mu.m;(b) the proportion by volume of particles having a particle diameter of not less than 30 .mu.m is not more than 20%; and(c) the proportion by population of particles having a particle diameter of not more than 5 .mu.m in the particulate material is not more than 65%, the particulate material also has an external additive attached to the surface thereof, the percent coverage by the external additive (determined by an equation described in the specification) being from 30 to 200%. The powder coating can provide a film having a reduced thickness with an improved leveling, thus improving working efficiency. In addition, the fractions of the powder coating from the coating process can be recycled and re-used, thereby reducing the total cost.
Abstract:
A current detector (130) is connected between the negative output terminal (-) of a high voltage DC power source (9) and the ground; the current detector (130) comprises a core (12) which is electrostatically shielded by a grounded conductive cover (15), a coil (11) wound around the core (12) and connected in series between the negative output terminal (-) and an electrode (4b) of a gas laser (1), and a Hall device (13) which is magnetically coupled to the core (12) and sends its output signal to a control signal input terminal (91) of the high voltage DC power source (9) so as to control high voltage output power of the latter.
Abstract:
A semiconductor memory device includes: a first memory cell array having a plurality of memory cells arrayed in a row direction and a column direction; a second memory cell array having at least serial access memory cells corresponding to a single row of the first memory cell array; a first data bus; a second data bus; a third data bus; and a bus switching control circuit for controlling a connection of each of the serial access memory cells to one of the first, second and third data buses and selecting one of the buses to connect the selected data bus to the external of the device. The bus switching control circuit outputs each of bit data in the serial access memory cells serially and alternately to the first and second data buses and, where a plurality of transfer data blocks are serially read out from the second memory cell array, outputs a bit data in the serial access memory cell corresponding to the head or last address in each of the transfer data blocks to the third data bus. As a result, it is possible to prevent interruption from being generated between the transfer data blocks in the serial data transfer operation and thus to increase the data transfer speed.
Abstract:
A hydraulic operating apparatus for a circuit interrupter comprises a conversion unit for converting input information from the exterior concerning a speed control pattern into an electrical signal for driving a linear or servo motor according to the closing and interrupting commands, the motor drive signal provided from the converting means being transmitted to the motor such that the displacement of the motor causes the hydraulic control valve apparatus to be operated to switch the fluid passages to selectively drive the hydraulic cylinder in different directions, and that the position during the switching of the hydraulic control valve driven by the motor is made different from the final stop position at its interruption or closed state to provide a throttle effect of a throttle in the hydraulic control valve thereby controlling the speed of the hydraulic cylinder. The hydraulic operating apparatus may comprise a conversion unit for converting contact closing and opening commands into an electrical signal for driving a linear or servo motor.
Abstract:
A tank-type switchgear comprises a main contact disposed in a hollow tank and having movable and stationary contact elements, an auxiliary contact disposed in the tank and electrically connected parallel with the main contact and having movable and stationary contact elements, a main lever rotatably connected to the movable contact element of the main contact, an auxiliary lever rotatably connected at one end thereof to the movable contact element of the auxiliary contact, a connecting link for rotatably supporting the other end of the auxiliary lever, a device for rotatably supporting the main lever and the connecting link with respect to the tank, and a driving device for rotating the main lever. The auxiliary lever is rotatably connected to the main lever such that the auxiliary lever rotates in the direction opposite the rotational direction of the main lever.