137results about How to "Reduce axial load" patented technology

A fastening system including a two piece swage type fastener including a pin and a collar in which the pin has relatively wide lock grooves and in which the lock grooves have a generally smooth root contour with the collar having a shank portion with a wall thickness defining an excess volume of material prior to swage greater than the volume of the confronting lock grooves and with the clearance between the inside diameter of the collar shank portion and the diameter of crests of the lock grooves being a minimum to reduce the compressive force required to swage the collar shank into the lock grooves and with the excess volume of collar shank material providing only a partial fill of the lock grooves upon swage.

Methods and transducers for producing acoustical signals having a spiral wavefront with omnidirectional magnitude and a phase that varies with angle and transducers for producing broadband omnidirectional reference signals for underwater navigation and communication.

An integrated sheath assembly for inserting f a medical device such as a percutaneous pump into a vessel can include a first sheath having a first lumen defining a first opening between proximal and distal ends of the first sheath for passage of a portion of the pump and a second sheath having a second lumen defining a second opening between proximal and distal ends of the second sheath. The second lumen is expandable to allow passage of the first sheath containing the portion of the pump. The first sheath fills a space between the second sheath and the portion of the percutaneous pump when the first sheath containing the percutaneous pump is inserted into the second lumen. The first sheath has a first hub, and the second sheath has a second hub. In some embodiments, a single sheath and a movable connector can be integrated on the medical device.

A Darrieus rotor supported by a bearing system to rotate about a vertical axis for capturing wind energy has an alternator that is directly-driven by the rotor and converts rotational power from the rotor into electrical power. An electronic controller controls the electrical load applied to the alternator and the power output from the alternator to an output. The alternator is constructed having a substantially constant reluctance torque for all angular positions of rotation of the rotor. The bearing system includes upper and lower rolling element mechanical bearings that provide radial support of the rotor against wind load and axial support of the rotor, and a magnetic bearing that provides axial lift that reduces the axial load on the mechanical bearings and reduces the starting torque for rotating the rotor. The electronic controller applies minimal electrical load to the alternator until the rotor is at a rotational speed greater than a deadband for the rotor in the instantaneous wind speed, whereby the electronic controller, the alternator and the bearing system together avoid retarding forces that would otherwise prevent passive self-starting.

The invention provides an ore crushing machinery without adding a crushing medium, which is a dry crushing machinery with a tower type structure; a rotating part is in the form of a longitudinal rotating shaft; one or more impeller main bodies are mounted on a shaft in series; a plurality of replaceable wear resistant blades and surface protective plates are arranged on each impeller main body, so that the impeller main body forms a rotor impeller group assembly with single-layer or multi-layer blades; a wear resistant lining layer, which comprises an upper lining plate, a material guide lining plate, an arc main lining plate, a bottom lining plate, a wear resistant fixing ring and so on, is correspondingly arranged on the periphery of each impeller; an interior cavity of each impeller forms a crushing chamber; and the crushing chambers in various stages are communicated with each other in a vertical direction. The ore crushing machinery provided by the invention has the advantages of high one-time crushing efficiency, high fine powder qualified rate, convenience in controlling, wide inlet material particle range, long service life, convenience in maintenance and no dust and noise pollution, and is very suitable for ore dressing metallurgy and architectural material industries; and standard dry powders or ore pulps can be directly produced, so that the production process is greatly simplified and production cost is reduced.

The present invention relates to a double-suction microminiature paddle pump. It is characterized by that its pump paddle wheel and motor rotor are formed into one body, the centre of said motor rotor is equipped with two paddle wheel inlets which are respectively communicated with pump paddle wheel, the cross-sectional area of said two inlets is progressively expanded along flowing direction; said two paddle wheel inlets ar respectively communicated with two suction inlets of pump. Said pump has no need of mechanical drive shaft, and can implement high-effective and safety conveyance.

The invention discloses an annular pressure downhole control valve, and belongs to the technical field of oil-gas well engineering. The annular pressure downhole control valve is designed to solve theproblem of annular pressure anomaly in an oil-gas well. The annular pressure downhole control valve comprises a coupling and an outer cylinder which is in fit connection with the coupling; the coupling and the outer cylinder are matched to form a first accommodating cavity and a second accommodating cavity, the first accommodating cavity communicates with a casing pipe, and the second accommodating cavity communicates with the exteriors of the first accommodating cavity and the casing pipe to form a one-way flow channel; and the second accommodating cavity is internally provided with a valvecore which can move along the inner wall of the second accommodating cavity to open or close the one-way flow channel. According to the annular pressure downhole control valve, the abnormal annular pressure in oil-gas well completion and production engineering can be alleviated, integrity and production safety of a wellbore are ensured, the structure is simple, the machining cost is low, and the cost of controlling the annular pressure can be effectively reduced.

The invention belongs to the field of vehicle shock absorbing equipment and particularly discloses a gear and rack shock absorber. The gear and rack shock absorber comprises a supporting box and a rack. The supporting box is provided with a slide hole for the rack to pass through. A motor and a rotating shaft are further arranged in the supporting box. A first belt wheel is installed on an output shaft of the motor. One end of the rotating shaft is provided with a gear meshed with the rack. The other end of the rotating shaft is provided with a second belt wheel. The first belt wheel and the second belt wheel are connected through a belt. A displacement sensor is arranged over the rack. A controller is further arranged in the supporting box. The controller is electrically connected with the motor and the displacement sensor.

The invention discloses a separated reaction flywheel body. The separated reaction flywheel body comprises a wheel rim, a wheel spoke, adjusting gaskets and a wheel hub, wherein the wheel rim is in coaxial clearance fit with the wheel spoke and connected with the wheel spoke through bolts; the wheel spoke and the wheel hub form an integrated structure through a welding process; the adjusting gaskets are nonmetal epoxy glass cloth plates, are clamped between the wheel spoke and the wheel rim and are used for adjusting damping coefficient of the whole wheel body and suppressing resonance amplification of the wheel body during working under a vibration environment. The wheel rim adopts an annular cylinder structure, and screw holes are formed in the internal side of the cylinder and the wheel rim can be coaxially connected with the wheel spoke through screws. The wheel rim is the far end of the wheel body in a radial direction and is made of a high-density stainless steel material so that the rotation inertia can be increased as much as possible. Central shallow holes are formed in the centers of two end surfaces of the wheel rim and used for reducing weight to realize dynamic balance. The separated reaction flywheel body disclosed by the invention is advantaged in that the machining process of the separated reaction flywheel body is simple, the structural strength/mass ratio and structural stiffness/mass ratio of the separated reaction flywheel body are high and the mass of the separated reaction flywheel body is obviously reduced; therefore, the axial load of the reaction flywheel is reduced and the reliability of the reaction flywheel is improved.

A machine room-less elevator apparatus which enables to reduce an installation space and whose cost can be reduced. The elevator apparatus has an elevator car (4), a counterweight (5), a guide rail (6) for the car, a guide rail (7) for the counterweight, a rope (8) for suspending the car and the counterweight, a sheave (9a) placed at an elevator shaft top section (3) and over which the rope (8) is passed, a motor (9b) for driving the sheave, and a hoist (9) for lifting and lowering the car and the counterweight. The elevator apparatus further has car sheaves (19, 20) arranged at the elevator shaft top section (3), a car suspension sheave (13) provided under the car (4), a counterweight sheave (30) provided at the elevator shaft top section (3), and a counterweight suspension sheave (15) provided at the counter weight (5). The rope (8) is connected at one end to a position near the center of the upper part of the car, passed over a hoist sheave (9a) after it is passed over the car sheaves (19, 20) and the car suspension sheave (13), and suspended via the counterweight suspension sheave (15) and the counterweight sheave (30). The other end is connected to a position near the center of the upper part of the counterweight (5).

The present invention relates to a method for producing a prefabricated part (1) from an unmachined part (2) by means of a milling tool (3). Said milling tool (3), when plunged into the material of the unmachined part (2), is automatically tilted in the advancing direction and/or laterally to the advancing direction in relation to the immersion path (4) that deviates from the direction (5) of the milling tool (3) that is machined immediately thereafter.

The invention discloses a method for constructing an independent pile tower crane foundation supported on an excavation slope. The steps are as follows: geologic drilling analysis is carried out on the excavation slope to draw up a construction scheme; according to the scheme, holes are dug on the excavation slope, water is pumped during the operation of digging the holes, retaining wall moulding boards are supported, and concrete retaining walls are cast. The diameter of each hole bottom is enlarged, and backing concrete is cast to form an expansion head. Independent supporting piles and the tower crane bearing foundation are cast by the concrete, the diameter of the independent supporting pile is equal to or larger than 1.42 times of the side length of each standard knot of a tower body, the depth of the independent supporting pile is equal to or larger than 1.5 times of the height of a pile foundation suspension arm, and the top face of the tower crane bearing foundation is lower than a natural terrace. The construction method has the advantages of low production cost, reliable quality, simple machines and equipment, convenient construction and operation and higher single-pile bearing force, thereby meeting the requirement of casting the tower crane bearing platform foundation; and the construction method has no noise during construction, no discharge of mud solution, little effect on ambient environment and buildings and small space occupation.