329results about How to "Prevent fluttering" patented technology

The invention discloses a ball forming mechanism of a steel ball rolling mill with quickly assembled ball rolling rollers, and belongs to a steel ball processing machine. The ball forming mechanism comprises a bracket, a pair of ball forming rollers, upper and lower ball stop plates and a pair of ball forming roller parallel distance adjusting device. The ball forming mechanism is characterized in that: two ends of a first upper cross beam are provided with first locking rod grooves, the upper ends of a pair of first bracket upright posts are hinged with first locking rods, and one end of thefirst locking rod is provided with a first mortise; two ends of a second upper cross beam are provided with second locking rod grooves, the upper ends of a pair of second bracket upright posts are hinged with second locking rods, and one end of the second locking rod is provided with a second mortise; a connecting plate is provided with a pull rod head hole, a pull rod head is formed at one end of a pull rod, and the end faces of a pair of adjusting screws are propped against the surface of a connecting block; and the first upper cross beam is provided with a first compaction screw, the lowerend of the screw is hinged with a first pressure pin, the second upper cross beam is provided with a second compaction screw, and the lower end of the screw is hinged with a second pressure pin. The ball forming mechanism is convenient and quick to assemble or disassemble, and can ensure the parallel distance of a pair of ball forming rollers and prevent a shaft seat from carrying the ball forming rollers to cause shake and jump.

In a magnetic disc apparatus including a plurality of magnetic discs mounted on a spindle, arms supporting magnetic heads, a rotary actuator for the arms, and a housing having an arcuate-shaped shroud, the improvement wherein gaps between the shroud and the sides of outer peripheries of the magnetic discs are larger than 0.1 mm and less than 0.6 mm. An open space is located, downstream of the arms with respect to the air flow on surfaces of the magnetic discs, the open space being devoid of the shroud. An opening is provided in the shroud, upstream of the arms with respect to the air flow and having a greater width than a width of the gaps defined between the magnetic discs and the shroud, and a bypass channel is provided which communicates between the opening and open space.

A magnetic disc unit which can restrain occurrence of flutter so as to countermeasure such a problem that the larger the rotational speed of discs, the higher the flutter, causing heat positioning errors, in order that the high rotational speed and high positioning accuracy are consistent with each other. Discs are surrounded along their outer peripheries by a shroud (outer wall) while a gap between end faces of the discs and the shroud is decreased to a predetermined distance, thereby to eliminate air pressure differential between opposite surfaces of each of the discs in order to reduce flutter.

The invention provides a method for machining a narrow groove system impeller, a grinding head and a preparation method of the grinding head. The grinding head is a cylinder. The top end of the grinding head is in the shape of a spherical surface, and a spiral groove is formed in the side wall of the grinding head. The preparation method includes the steps that materials for use are calculated; ingredients are weighed; wetting and material mixing are performed; pressing of grinding head sand blocks is performed; drying is performed; the firing link is performed; and the grinding head sand blocks which are qualified through checking are selected and enter an adhesion processing procedure of a cutter handle, the cutter handle is bonded, after adhesives are cured and stabilized, laser dressing is performed, grooving is performed, and acceptance check of the grinding head is performed, and therefore preparation of the grinding head is completed. The method for machining the narrow groove system impeller through the grinding head includes the steps that fluttering stability analysis is performed, and a stable lobe graph of a grinding system is established; the technological parameter selecting range of stable grinding is determined; and technological parameters of stable grinding are selected, and the grinding head is installed for grinding machining. By means of the grinding head, the grinding temperature is effectively lowered, the adhesion and abrasion effects of cuttings on the grinding head are reduced, the machining surface burning problem is reduced, and better machining surface quality is acquired.

An easily producible turbine nozzle for a gas turbine engine is provided, which is capable of preventing flutter of the turbine nozzle during operation of the gas turbine engine. The turbine nozzle comprises airfoils stacked along the stacking axis. The high curvature portions on suction surface in airfoil section successively formed along the stacking axis of the airfoil describe a parabola line that curves toward the pressure side of the airfoil when seen from the front or rear of the turbine nozzle. The high curvature portions on suction surface in airfoil section curve most at the center along the stacking axis of the airfoil from a straight line that connects with a first intersection between the parabola line and an inner band in the turbine nozzle and with a second intersection between the parabola line and an outer band in the turbine nozzle. The maximum curvature falls within a range from 0.02 to 0.03-fold of the stacking axis of the airfoil.

The invention discloses a charged maintenance operation robot for transformer substation equipment. The charged maintenance operation robot includes a robot body; the robot body comprises a moving chassis and an insulating lifting arm arranged on the moving chassis; a small flying arm is connected to the front end of the insulating lifting arm, a charged operating platform used for storing a charged operating tool is arranged at the front end of the small flying arm, and the small flying arm is connected with the charged operating tool through a fast connecting device; and the charged operating tool includes a foreign body cleaning tool, a wire repairing tool, and an insulator cleaning tool. The charged maintenance operation robot has the beneficial effects that a multi-sensor informationfusion technology is adopted, various sensors installed on the robot are used to sense the information of the robot body and the surrounding environment, and the safety and reliability of the robot operation are improved.

A three-wheel pedal-style wheelchair which includes a roller at a side, close to the ground, of the wheelchair, wherein the roller prevents the wheelchair from turning over, a steering wheel arranged at a side of the wheelchair, and two front wheels respectively arranged at two opposite sides of the wheelchair, wherein the two front wheels comprises a driving wheel led to rotate forward or backward by a user stepping and a loose wheel, wherein when the wheelchair turns to a direction in a small radius, the steering wheel is considerably rotated to a direction and the driving wheel is rotated forward, wherein when the wheelchair turns to another direction, the steering wheel is considerably rotated to a direction and the driving wheel is rotated backward. Accordingly, the wheelchair is easily controlled to have a small turn, like whirling in one spot, to move and to turn safely.

The invention discloses a solid liquid mixing device for preparing superfine slurry. The solid liquid mixing device comprises a liquid mixing feeding device, a solid pulverizing feeding device, a primary solid liquid mixing device, a conveying pump, a secondary solid liquid mixing device, a material return pipe and the like, wherein a pulverizing device performs primary pulverizing on solid particles, so that the mixing speed is accelerated; through the arrangement of a baffle plate and a blast blower, the solid particles are prevented from flying into air; a stirring paddle is arranged into aspiral paddle shape, so that mixed materials can be easily driven to rotate in an advancing way; a screen mesh type framework is arranged at the periphery of a tube body, so that the solid particlescan conveniently go in or out; the mixing speed is accelerated; an included angle of a stirring blade and a stirring shaft forms a certain angle, so that the pulverizing and mixing effects are reinforced. The solid liquid mixing device disclosed by the invention has the advantages that the air dust pollution cannot be caused; the mixing efficiency is high; the mixing speed is high; the continuousoperation can be realized; the goal of preparing the superfine slurry through solid liquid mixing can be fast and efficiently achieved.

An image reading apparatus capable of preventing the occurrence of a streak and reading a quality image from the leading edge to the trailing edge of a original. An original is conveyed along a convey pass. The original being conveyed is guided by a guide member, at least part of the guide member being transparent. An image of the original being conveyed is read by an image sensor through the guide member. Airflow is generated, the airflow being blown into the convey pass from a location upstream in a conveying direction compared to a location of the image sensor. The guide member has a convex portion disposed at a location upstream in the conveying direction compared to the location of the image sensor.