9 results about "Axial length" patented technology

The invention discloses a sensor for monitoring metal abrasive particles in oil liquid on line. The sensor is a mutual inductance sensor and comprises an exciting coil and an inducting coil, wherein an oil path through which the oil liquid can pass is arranged in the center of a framework made of a magnetic inert material; the exciting coil and the inducting coil are coaxially wound on the framework; the inducing coil is positioned between the exciting coil and the framework; the axial length of the inducting coil is 1/4-1/2 of that of the exciting coil; and the axial center points of the inducting coil and the exciting coil are superposed. The sensor realizes zero compensation and adjustment by adopting a parallel measurement structure and is simple in structure, high in sensitivity, high in linearity and high in interference resistance. The sensor applied to on-line monitoring for the metal abrasive particles in the oil liquid is convenient to operate, high in instantaneity, high in measurement precision and accurate and reliable in monitored result and can be widely applied to military and civil fields and used for monitoring the pollution degree and the abrasion to the oil liquid of lubricating systems of mechanical equipment such as various air planes, naval vessels and automobiles and monitoring and diagnosing faults of the lubricating systems of the mechanical equipment to avoid safety accidents.

The invention discloses a method for controlling a non-radial displacement transducer of a multi-phase and single-winding bearingless motor. The control for torque and suspension of the multi-phase and single-winding bearingless motor is finished in two planes which are orthorhombic mutually; and a multi-phase inverter is utilized to simultaneously introduce two groups of currents with different phase differences to the motor, thus respectively realizing the torque drive and the rotor suspension of the motor. With respect to the multi-phase and single-winding bearingless motor with the phase number of more than or equal to 7, displacement signals are extracted from another plane different from a torque plane and a suspension plane according to the the characteristics of MDOF (multiple degree of freedom) of the multi-phase motor by utilizing the relationship between mutual inductance and eccentricity among different planes in an eccentric state, so as to research the non-displacement transducer control technology of the motors. In the method, the multi-control DOF of the multi-phase and single-winding bearingless motor is utilized to extract radial displacement information of a rotor under fundamental frequency, thus reducing the system cost, shortening the radial length of a system and improving the system reliability.

An object is to increase the mechanical efficiency of an injection molding machine, decrease the inertia, and decrease the axial length. The injection molding machine comprises a cylinder member; an injection member disposed within the cylinder member such that the injection member can advance and retract; an injection motor (82); and a transmission shaft which is connected to the injection member such that the transmission shaft can rotate relative to the injection member. The transmission shaft has a rotation transmission portion, to which rotation of the injection motor (82) is transmitted, as well as a motion conversion portion for converting rotational motion to linear motion. The injection motor (82) and the transmission shaft are disposed on the same axis, and the transmission shaft is advanced and retracted inside the rotor (92) of the injection motor (82). In this case, since rotation of the injection motor (82) is transmitted directly to the transmission shaft without intervention of a speed reduction mechanism, a pulley, and the like, mechanical efficiency can be improved, and inertia can be decreased. Further, the time required for changeover from the injection stage to the pressure holding stage is shortened. Since the transmission shaft is advanced and retracted inside the rotor (92) of the injection motor (82), the injection molding machine can be reduced in axial length.

The invention discloses a drilling tool of a rotary drilling rig. The drilling tool comprises a top plate (1) and a connecting block (2) connected with the top plate (1); the top plate (1) is connected with a first cylinder (3), a boring mud inlet (31) is formed in the first cylinder (3), and an openable bottom plate (4) is connected onto a bottom wall of the first cylinder (3); the top plate (1) is further connected with a second cylinder (5) sleeved outside the periphery of the first cylinder (1), the diameter of the second cylinder (5) is more than that of the first cylinder (3), and the bottom of the second cylinder (5) is provided with first drilling teeth (51); and the axial length of the first cylinder (3) is more than that of the second cylinder (5). For the structural design of the drilling tool, on the premise of the ensuring the drilling efficiency, the drilling tool integrates the functions of loop drilling and boring mud salvaging into a whole, so that the construction efficiency can be obviously increased finally. In addition, the invention further discloses a rotary drilling rig comprising the drilling tool.

An assembly including an airfoil and a platform on which the airfoil may be mounted, the surface of the platform presenting a circumferential depression between a leading edge and trailing edge of the airfoil, a deepest section of the depression being situated in an upstream half of the airfoil. A skeleton curve designates a curve of variations of a skeleton angle of the airfoil as a function of position along the axis of the wheel, and a linearized skeleton curve designates a curve of variations of an angle as a function of position along the axis of the wheel, the curve being a straight line connecting together points representing the skeleton angle respectively at 10% and at 90% of the axial extent of the airfoil from the leading edge. In a vicinity of the platform, the skeleton curve presents a raised portion that lies above the linearized skeleton curve.

A downhole tool includes a circumferential band having a plurality of axially adjacent weld beads forming a wear resistant surface along a particular axial length of the tool and at least one circumferential multi-layer coating applied axially adjacent the band on either end. The multi-layer coating includes a first layer, exhibiting a first color, applied directly onto the tool surface, and a second wear-resistant layer, exhibiting a second color different from the first color, applied directly onto the first layer. The second layer wears or is removed by a certain amount, such that the first color of the first layer is revealed to indicate the extent of wear and/or that the tool should be removed from service and refurbished by applying a new wear-resistant coating.

The invention discloses a pneumatic tool motor with a built-in beating mechanism. The pneumatic tool motor comprises an air cylinder body, a rotor group and an output shaft rod, wherein the rotor group comprises a drum and a telescopic blade, and the output shaft rod can be driven by the drum; an inner containing chamber is formed in the inner part of the drum of the rotor group; the output shaft rod is provided with a beating action zone which is positioned in the inner containing chamber; the inner containing chamber is internally provided with the built-in beating mechanism, and the built-in beating mechanism comprises a beating convex block which is arranged in the beating action zone in a bulged way, a movable beating hammer which is arranged at the periphery of the beating convex block in a sleeving way and a supporting post which is axially located on the drum. According to the pneumatic tool motor with the built-in beating mechanism, disclosed by the invention, the axial length and the volume of the pneumatic tool motor can be substantially reduced, and the advantage and advancement that the use is more labor-saving and more convenient can be achieved; the built-in beating mechanism of the pneumatic tool motor has the advantages that the rotor group can be directly driven, a twisting force can be increased immediately, and the disassembling and the locking of components are quick and convenient, and thus the pneumatic tool motor has the advantages that the multi-aspect cost can be substantially reduced, and the better industrial economic benefit can be obtained.

The invention discloses a spiral flow type suspension bed reaction device. The spiral flow type suspension bed reaction device comprises a spiral flow generator and a suspension bed reactor; an outletof the spiral flow generator is connected with an inlet of the suspension bed reactor; the spiral flow generator consists of a shell and a spiral structure which is arranged on the inner wall of theshell; the axial length of the spiral structure is equal to the axial length of the shell. According to the spiral flow type suspension bed reaction device, through the spiral flow generator, a material is fed into the cone bottom of the reactor in a double-spiral rotating manner under the action of the spiral structure; the material stirs reaction materials in the cone bottom while ascending, sothat the materials in the reactor are mixed uniformly; therefore, the heat and mass transfer effect of the reactor is effectively reinforced; the performance of the reactor is improved; moreover, thesuspension bed reactor does not have any internal components internally, and is simple in structure and convenient to maintain.

The invention discloses a tail gas purification device for a vehicle, and the vehicle. The tail gas purification device for the vehicle comprises a shell, a gas inlet pipe and a gas outlet pipe. The gas inlet pipe is at least partially arranged in the shell. The gas outlet pipe is connected with the shell. A gas flow channel is formed between an outlet of the gas outlet pipe and an inlet of the gas inlet pipe. A tail gas purification structure used for purifying gas flowing in from the inlet and flowing out from the outlet is arranged in the gas flow channel. The gas flow channel at least comprises a forward flow section and a reverse flow section. The gas flow direction in the forward flow section is opposite to the gas flow direction in the reverse flow section. The tail gas purificationdevice is more compact in structure, and the larger-capacity tail gas purification structure can be arranged in a small axial space so that tail gas can be fully purified in a smaller axial length range of the tail gas purification device, and thus, the tail gas purification device occupies a smaller space and can be mounted on a vehicle.