207results about How to "Avoid Magnetic Interference" patented technology

A disk drive of a perpendicular magnetic recording type uses a double-layered disk. The disk has a plurality of tracks for storing data and a non-recording region (GB area) between tracks. Not a DC magnetized pattern but an AC magnetized pattern or a random magnetized pattern is recorded in the GB area. With this structure, it is possible to prevent an influence of magnetic disturbance due to a DC magnetic field on the surface of the disk.

The invention relates to a double-camera module group, and the module group comprises a circuit board, a lens seat, two image sensors, two lens module groups, a liquid crystal lens, and a welding pin. The two lens module groups are disposed on the same lens seat, and the bottom surface of the lens seat is connected with the circuit board. Moreover, the top surface of the lens seat is provided with the liquid crystal lens, thereby enabling the liquid crystal lens to cover the two lens module groups. The welding pin in the lens seat can enable the liquid crystal lens to be electrically connected with the circuit board. During assembly, the focuses of the lens module groups are adjusted, and the liquid crystal lens is used for focusing during photographing. In other words, the circuit board supplies power to the liquid crystal lens through the welding pin. The path of light passing through the liquid crystal lens is correspondingly changed during different voltages, and the focusing function is achieved under the condition of no voice coil motor. Therefore, the module group can effectively prevent the magnetic interference between two voice coil motors, and improves the image quality. Moreover, the two lens module groups achieve the focusing function through the liquid crystal lens, so the module group can effectively solve a problem that the movement of the two lens module groups is not consistent, and improves the image quality.

A full-automatic inertial sensing pavement evenness detection system comprises a sensing unit, which comprises an accelerometer, a gyroscope and a temperature sensor; the accelerometer is an inertial sensor; a three-axis angular rate sensor of the inertial sensor is used for measuring and outputting the angular rates of motion in two directions to a peripheral processing circuit; and the processing circuit receives the measuring results outputted by a three-axis acceleration sensor and the three-axis angular rate sensor, and acquires the pavement evenness information of each measured point by way of operation as a probe passes through a measured pavement. By adopting the miniature solid-state vibratory gyroscope and the MEMS (Micro-electromechanical System) accelerometer as core measuring devices, the invention effectively reduces the size of the measuring system, and the system can resist shock vibration, can be adapted to various pavement evenness measurement environments, can carry out full-automatic detection, and cannot be affected by outside electric and magnetic fields.

An optical system includes a base, a first lens driving module, and a second lens driving module. The first lens driving module includes a first lens holder, a first magnet, and a first coil. The first lens holder is configured to hold a first optical element. The first coil corresponding to the first magnet is configured to drive the first lens holder to move relative to the base. The second lens driving module includes a second lens holder, a second magnet, and a second coil. The second lens holder is configured to hold a second optical element. The second coil corresponding to the second magnet is configured to drive the second lens holder to move relative to the base. The first magnet is disposed between the first and second lens holders, and no other magnet is disposed between the first and second lens holders except the first magnet.

The invention discloses a method for point measurement of a well by a gyroscopic inclinometer. The gyroscopic inclinometer with two dual-DOF (degree of freedom) flexible gyroscopes and a dual-quartz accelerometer is fixed on a carrier and extends in the well along with the carrier; data collected by the gyroscopes and the quartz accelerometer are input for calculating an azimuth angle Gama, an inclination angle Alpha and a transverse rolling angle Beta. In the method, the data in the well are collected by the gyroscopes; furthermore, the azimuth angle, the inclination angle and the transverserolling angle of a certain point in the well can be measured by filtering, attitude algorithm and dislocation; the measuring reliability is good, the measuring precision is high and the measuring speed is quick; the method is realized by an embedded computer; the aim of collecting and calculating data underground can be achieved; a well track drawing can be drawn by the measured data, therefore, the obtaining of the drilling well track can be facilitated; and the gyroscope has high sensitivity and good stability, is not interfered by magnetic field, can be used conveniently, and can complete inclination point measurement relaying on measuring the angular rotation velocity of the earth.

The invention relates to a non-magnetic heating temperature control system, in particular to the non-magnetic heating temperature control system which is used for an atom magnetometer system and utilizes laser to heat an atomic air chamber. The non-magnetic heating temperature control system comprises a laser, a 1*4 optical divider, an atom heating chamber and a temperature controller, and is characterized in that the laser and the 1*4 optical divider are connected through a tail fiber, the 1*4 optical divider and the atom heating chamber are connected through a tail fiber, and the temperature controller and the laser are connected through a single-core shielding signal line. An enough span exists between the electrical part, which can generate a disturbing magnetic field of the laser and the temperature controller and the atom heating chamber, and therefore the situation that a working area of the atomic air chamber generates magnetic field interference is avoided. A laser heating mode is adopted, the influence of introducing magnetic noise is avoided in the same way, the heating speed is high, a three-wire non-magnetic platinum resistor is used as the temperature sensor, the accuracy of measuring the temperature is guaranteed, and meanwhile the interference of the magnetic noise is avoided.

The invention provides a sensor for sensing an angle position of a rotating shaft and a sensing system, wherein a magnet conductive block is fixedly arranged on the rotating shaft and can rotate along with rotation of the rotating shaft. The sensor comprises a magnet device and a Hall effect sensing component. The Hall effect sensing component is used for sensing the angle position of the rotating shaft. When the magnet conductive block rotates along with the rotating shaft, a magnetic field which is generated by the magnet device is changed. The Hall effect sensing component generates an electric signal along with magnetic field change. The electric signal indicates the angle position of the rotating shaft. Because built-in U-shaped back magnet technology is adopted for the sensor of the invention, sensing precision of the sensor is greatly improved. Therefore a precision requirement for measuring the angle position of the rotating shaft can be satisfied through using a single IC chip which is provided with one Hall effect sensing component.

The invention discloses an FRP (Fiber Reinforced Polymer, fiber reinforced polymer) sheet anchor and its anchoring method, and relates to an anchor for engineering structures in the field of high-performance polymer structural materials. The present invention comprises a sheet (10), an upper anchor plate (20), a lower anchor plate (30) and a bolt (40); the sheet (10) passes through a bellows (50) and is placed on the upper anchor plate (20) and the lower Between the anchor plates (30), the upper anchor plate (20) and the lower anchor plate (30) clamp the sheet (10) together, and the bolts (40) pass through the upper anchor plate (20) and the lower anchor plate (30) The upper anchor plate (20) and the lower anchor plate (30) are anchored tightly by the plate holes (25). The anchorage is non-corroding, and it is placed in a completely non-metallic engineering structure together with the FRP sheet, which has durability; it is light in weight and is used in bridges and other structures to enhance the spanning ability; it has good electromagnetic insulation.

This invention discloses an instrument for measuring deep low temperature liquid levels, which isolates a sensor and the atmosphere in airproof to make it in the same pressure with a tested container, so the level guage is allowed to work at the deep low temperature flume with positive or negative pressure (such as liquid N, liquid O, liquid Ar and liquid H) in which, the reading is stable, reliable. This invented level guage is used in the level measurent of the liquid N tank in a large current lead constant temperature device of a large type of EAST and not influenced by the magnetic field generated by several ten thousands of amperes.

The invention discloses a course information collection system. A CMOS (Complementary Metal Oxide Semiconductor) image sensor is adopted; a common six-degree-of-freedom mirco-electro-mechanical system gyroscope is combined; technologies such as image identification, plane transformation, pattern matching and fusion operation are adopted; course parameters of an unmanned aerial vehicle are calculated in real time; aiming at a small unmanned aerial vehicle flying at a low altitude and indoors, an autonomous course control solution with high navigation accuracy, high integration level and low cost is realized; the defects that signals can be shielded by objects during satellite navigation and signals can be easily affected by electromagnetic interference, signal drift and the like during inertial navigation can be overcome.

A method for monitoring the pressure viration of car's tyre includes such steps as acquiring the data of different kinds of tyre, creating the rotation speed database of each kind of tyre by calculation, comparing the measured real-time data with the data in database for relative tyre, determining the variation of tyre pressure, and generating alarm if it is under-pressure. Its system is also disclosed.

The invention discloses a cell strain loading device under a three-dimensional culture condition, a power supply is connected to an electrode of a driving part of a piezoelectric ceramic plate by a drive line, and the electrode is connected with the piezoelectric ceramic plate; the piezoelectric ceramic plate is fixed on a base bottom by a fixed device of the ceramic plate, the back end of a displacement transfer plunger and a displacement output end of the piezoelectric ceramic plate are fixed together, a three-dimensional complex which is composed of a cell-scaffold is positioned at the central position of the bottom part of a culture small chamber, the left and the right are respectively connected with porous fixed material, one side of the porous fixed material is fixed on the wall of the culture small chamber, the other side of the porous fixed material is fixedly connected with the displacement transfer plunger; a laser probe is non-contact arranged at the back end of the transfer plunger and is connected with a computer for the detection of the front and back displacement of the transfer plunger. The invention can load amplitude and frequency and facilitate regulation without machine shutdown; the invention has good operability, high repeat precision, smooth mechanical loading and small error; furthermore, the invention can avoid magnetic field interference.

The invention provides a superconducting magnetic separator which comprises a superconducting magnetic system, a magnetic wire rotary drum (15), a positioning system of the magnetic wire rotary drum, a driving system of the magnetic wire rotary drum, a support (10) of the superconducting magnetic separator and the like. The superconducting magnetic system comprises a housing (1) of the superconducting magnetic system and a magnetic core coil (4), and the magnetic core coil (4) is wrapped by the housing (1) of the superconducting magnetic system; the magnetic wire rotary drum (15) is positioned on the support (10) of the superconducting magnetic separator by the positioning system of the magnetic wire rotary drum, and the magnetic wire rotary drum (15) penetrates the center of the superconducting magnetic system and can rotate freely around the point of the center of a circle under the driving of the driving system of the magnetic wire rotary drum. The superconducting magnetic separator utilizes the central part with the strongest magnetic field intensity in the superconducting magnetic system, fully utilizes the energy of a magnetic field and the electrical energy, and can better separate and sort a variety of components with different magnetisms in ores; furthermore, the superconducting magnetic separator has convenient mounting, easy control and easy maintenance and can avoid the interferences of the magnetic field. The superconducting magnetic separator can also be applied in foods, biotechnology, pharmaceutical industry, medicine, medical industry and other fields.

The invention relates to pipeline defect detection devices and methods and particularly relates to a non-contact pipeline defect detection device with a GPS (Global Positioning System) positioning function and a detection method. The detection device is used for solving the problems of the existing detection equipment that the existing detection equipment can only carry out contacted or low-distance-measurement detection and is not provided with a positioning function. The detection device comprises a scanning mechanism, a GPS, a host and two data wires, wherein the data transmission interface of the scanning mechanism is connected with the communication interface of the host through one data wire, the communication interface of the GPS is connected with the communication interface of the host through the other data wire, the GPS consists of a passive signal receiving antenna and a data processing chip, the passive signal receiving antenna is connected with the data processing chip, and the data processing chip is connected with the communication interface. The device and the method are applied to pipeline defect detection.

The invention discloses a needleless injector based on piezoelectric conversion and a using method of the needleless injector. The needleless injector comprises a handle part, a medicine suction part, a piston driver part, a medicine administration part and a control circuit part, wherein both the piston driver part and the control circuit part are arranged in a cavity of the handle part. The medicine suction part is arranged at the front end of the handle part; and the medicine administration part is arranged at the front end of the medicine suction part. The using method comprises the following steps: inserting a medicine bottle in a medicine suction needle head in the medicine suction part, and discharging air in a runner in the injector; controlling a piezoelectric type micro-displacement amplification mechanism to shrink by virtue of the control circuit part, so that medicine liquid in the medicine bottle flows to a hollow region of the medicine suction part under the action of atmosphere; and after completing medicine suction, controlling the piezoelectric type micro-displacement amplification mechanism to extend by virtue of the control circuit part so as to drive a piston to move towards the medicine administration part, so that the medicine liquid in the hollow region of the medicine suction region jets outwards by virtue of the medicine administration part under the action of the piston. The needleless injector disclosed by the invention is free from generation of blasting noise, and the needleless injector is precise in control and small in volume.

The invention discloses an underground hole drilling and trepanning azimuthal angle measurement system and method. The system comprises a line marking device and a measurement host. Two line light source emitting devices on the line marking device generate two emitting planes, the first emitting plane is used for being aligned to a center line of a roadway, the second emitting plane intersects with a light sensing face on the measurement host to form a sensing straight line, the included angle between the light sensing straight line and a set shaft of the measurement host and a self inclination angle are measured thorough a processing system inside the measurement host, and therefore the hole drilling and trepanning azimuthal angle is calculated. The line marking device can be arranged according to drill sites, is installed at a time and used repeatedly, does not need to be moved and adjusted frequently, does not need to be manually operated after being installed and fixed, and can achieve continuous real-time measurement which cannot be achieved through various original examination methods. Due to the fact that the projection of the central line of the roadway on the horizontal plane is horizontally moved to the position easy to utilize, the hole drilling azimuthal angle can be more rapidly and visually measured.

The invention discloses a control moment gyroscope, which comprises a momentum wheel, an outer frame system, a moment motor and an optoelectronic encoder, wherein the momentum wheel is used for providing a constant angular momentum; the outer frame system is used for supporting the momentum wheel and providing a fixing interface for mounting a satellite; the a torque motor is used for driving thehigh torque output and the low-speed smooth rotation of the outer frame system; and the photoelectric encoder is used for measuring the absolute position of the outer frame angle of the outer frame system. Under the maneuvering condition of the control moment gyroscope, the high-precision moment required for the rapid maneuvering of the whole satellite is generated, and the high-precision angularmomentum exchange with the whole satellite is realized through the accurate control of angular momentum direction. The control moment gyroscope adopts the absolute photoelectric encoder to realize high-precision outer frame control, improves the high control accuracy over the moment of the control moment gyroscope, and meets the requirement of high pointing accuracy of the agile satellite.

The invention discloses a gyroscopic wheelbarrow robot system capable of realizing self-balancing. A gyroscopic mechanism of the gyroscopic wheelbarrow robot system comprises a gyroscopic rotor, an inner ring frame and an outer ring frame. The gyroscopic rotor is horizontally installed in an inner tooth ring and is driven by a rotor motor to rotate. The inner tooth ring is installed in the inner ring frame and is driven by an inner tooth ring motor to rotate. The inner ring frame is installed in an outer tooth ring. The outer tooth ring is installed in the outer ring frame and is driven by an outer tooth ring motor to rotate. The gyroscopic rotor is orthogonal with the inner tooth ring in position, and the inner tooth ring is orthogonal with the outer tooth ring in position. A balance wheel mechanism of the gyroscopic wheelbarrow robot system is arranged on the gyroscopic mechanism and comprises a balance wheel support and a balance wheel. The balance wheel is vertically installed on the balance wheel support and is driven by a balance wheel motor to rotate. A single wheel mechanism of the gyroscopic wheelbarrow robot system is arranged below the gyroscopic mechanism and comprises a single wheel and a vehicle fork. The single wheel is driven by a pancake motor on the vehicle fork to rotate. According to the invention, the gyroscopic mechanism is used as a stabilization control device, and lateral and front-and-back bistable balance control of the vehicle body is realized.

A magnet assembly can be attached to, or placed in the vicinity of, a conventional bell nipple to generate a magnetic field within the central bore of the bell nipple. The magnetic field catches falling metal objects and prevents such objects from passing beyond the bell nipple and entering the subterranean portions of a wellbore. An optional diverter assembly slows the velocity of falling metal objects before reaching the magnet assembly, while also wiping the outer surface of pipe or other items lowered into a wellbore.

The invention discloses an electronic throttle valve body of a diesel engine. The electronic throttle valve body comprises a main body, a printed circuit board of a control circuit, a throttle valve sheet, a limiting block, a bearing, a throttle valve shaft assembly, a magnet assembly, a socket assembly, a resetting gear assembly, a direct-current motor, a resetting spring and a dustproof cover. The printed circuit board of the control circuit is welded on the socket assembly; a limiting board is formed on a throttle valve shaft through injection molding so as to form the throttle valve shaft assembly; a resetting gear is welded on the throttle valve shaft assembly; the throttle valve shaft assembly is assembled on the throttle valve body through the bearing; and the throttle valve sheet is inserted into the throttle valve shaft and is linked through a screw. The direct-current motor is mounted in the main body through the socket assembly in a pressing manner. The resetting spring is located below the resetting gear assembly. One stand bar of the resetting spring is hung on the main body, and the other stand bar is hung on the resetting gear assembly. The electronic throttle valve body disclosed by the invention is not influenced by a magnetic field. Furthermore, an entire control system is sealed in a cavity. Compared with the prior art, a protection cover is manufactured by a metal board with higher magnetic conductivity, so that the electronic throttle valve body can be used for shielding external electromagnetic interferences.

The invention provides a flow control valve, which can be used for flow control in an exhaust gas recirculation pipeline of an internal combustion engine. The flow control valve is provided with a pipe communicating the pipeline, wherein a rotary plate for blocking the pipe is arranged along the vertical direction of the pipe; at least one opening is reserved on the rotary plate; the rotary plate can rotate to the position where the opening and the pipe are superposed; the diameter of the opening is not greater than the outer diameter of the pipe; and a drive mechanism can drive the rotary plate to rotate around the axis of a rotating shaft and the drive mechanism can be a piezoelectric drive mechanism. The flow control valve has the advantages of compact and simple structure, smart size, low energy consumption, low noise and easy and accurate flow adjustment.

The invention belongs to the field of data fusion of magnetometers and inertial navigation systems and the field of adaptive Kalman filtering, and particularly relates to an inertial and magnetometercombination adaptive anti-interference method. The inertial and magnetometer combination adaptive anti-interference method comprises the steps that first, an output model of a magnetometer and a gyroscope is utilized to deduce a model for updating magnetometer output through the angular rate, then direct output of the magnetometer serves as the measurement amount to be substituted into a filter. Meanwhile, the invention designs an adaptive extension Kalman filter based on robust control. A noise variance array of measurement information is calculated according to the residual between the measurement amount and the predicted amount, and thus interference is effectively suppressed. The interference duration is judged while interference is handled; when it is judged that interference is long-time interference, through the inertial and magnetometer combination adaptive anti-interference method, a magnetic field value is extrapolated through inertial navigation at the early stage of interference, the magnetometer is quickly recalibrated, after calibration is completed, a magnetometer calibration parameter is substituted back into an anti-interference module again, and thus the long-timeanti-interference effect is ensured.

The invention provides a horizontal-vibration linear motor of low magnetic leakage. The motor comprises a casing, a cover plate, a vibration assembly and a solenoid, vibration assembly is hung inside the mounting space by being positioned via elastic support pieces positioned on the two opposite inner walls of the casing, and when the solenoid is electrified, the vibration assembly vibrates in a reciprocating manner in the direction basically parallel with the bottom of the casing, and the two elastic support pieces are stretched and compressed. The vibration assembly comprises a mass bock connected with the elastic support pieces and permanent magnets mounted on the mass block. A magnetic blocking plate covers the mass block in a fit manner and further covers the permanent magnets, the material of the magnetic blocking plate is No.430 stainless steel, and the thickness of the magnetic blocking plate ranges from 0.2 to 0.5mm. According to the horizontal-vibration linear motor of low magnetic leakage, the magnetic field intensity at the outer side of the magnetic blocking plate is controlled below 500GS, components of a mobile phone or game machine at the outer side of the magnetic blocking plate are prevented from interference of the magnetic field, the production cost is reduced, and the linear motor is conducive to production scale enlargement of domestic enterprises.

The invention discloses an atomic gas chamber temperature closed-loop control method based on optical pumping saturated absorption. The method comprises the following steps: (1), performing temperature measurement based on optical pumping saturated absorption; and (2), performing digital closed-loop control. The method has the following beneficial effects: high-stability closed-loop control of thetemperature of the atomic gas chamber is realized; compared with the traditional temperature measurement technology based on a thermistor and a simulation closed-loop control method, the atomic gas chamber temperature closed-loop control method can truly reflect the temperature change in the atomic gas chamber; the influence of the temperature gradient caused by the low heat conductivity coefficient of the glass is reduced and the stability of the temperature in the gas chamber is improved; the magnetic field interference generated by temperature detection signals is avoided; moreover, the influence of a limited temperature control range caused by an unbalanced bridge and analog closed-loop control is avoided, and the adjustability of the temperature control range is improved.

The invention relates to a hybrid power engine; an upper magnetic piston and a lower magnetic piston are arranged in a working cylinder, wherein, the upper magnetic piston and a bidirectional cam are in a top contact fit and synchronously rotate through being restored by a restoring spring; the end plane of the upper magnetic piston and the end plane of the lower magnetic piston are respectively provided with two magnets with the same size but different polarities. The lower magnetic piston is in transmission connection with a main crank through a lower connecting rod; the bidirectional cam, a rotary drive gear of the upper magnetic piston are respectively in transmission connection with a drive gear of the engine. A power output shaft and the main crank of the engine are respectively provided with a meshing control device and a separating control device. The hybrid power engine outputs power by adopting a low displacement engine or a motor to match the magnetic mixing effect so as to reduce both fuel dosage and exhaust emission. If the motor is used as power, the hybrid power engine only needs to be charged periodically to truly implement energy conservation and environmental protection without using fuel or exhausting waste gas.

The invention relates to an intelligent comprehensive geologic survey instrument for a mine and a measuring method of the intelligent comprehensive geologic survey instrument and overcomes the defect that the comprehensive geologic survey instrument is still not produced for complicated underground conditions in the prior art. The intelligent comprehensive geologic survey instrument comprises a laser ranging module, an electronic compass module, a laser surface-fixing component and a processor, wherein the laser ranging module and the electronic compass module are respectively connected with serial ports of the processor; the laser surface-fixing component is connected with a control terminal of the processor; the mounting positions of the electronic compass module and the laser surface-fixing component are located on the same horizontal plane. The intelligent comprehensive geologic survey instrument disclosed by the invention integrates multiple functions; the multiple functions are mutually coordinated to improve the accuracy and the measuring efficiency of underground measurement; the operation is more convenient.

The invention discloses a self-walking equipment system. The self-walking equipment system comprises a signal generating device, a wire for setting the work region of self-walking equipment, and the self-walking equipment. A closed-loop conducting loop is formed by the wire and the signal generating device. The self-walking equipment comprises a driving unit, a control unit and at least one magnetic field signal detecting unit, all of which are arranged on a body of the self-walking equipment. The magnetic field detecting units output detection signals according to the sizes and directions of detected magnetic fields, and the control unit receives the detection signals and controls the self-walking equipment to move in the work region according to the detection signals. The signal generating device comprises a pseudo-random pulse signal generator adapting to the length of the wire and outputting signal pulses, and a constant current unit. Compared with the prior art, the constant current unit is additionally arranged, and therefore the magnitude of signal current in the wire is stabilized; the pseudo-random pulse signal generator is additionally arranged, and therefore magnetic field signals inside and outside the wire are easier to detect, and the self-walking equipment system is low in cost, simple and practical.

The invention discloses a control moment gyro driven by a parallel type linear ultrasonic motor and belongs to the technical field of control moment gyros. The control moment gyro comprises a rotatingcomponent and a fixing component and is characterized in that the rotating component provides rotational inertia needed by angular momentum, and power supply and a rotating speed control signal are provided for the rotating component through a slide ring component; the rotation angular speed of the angular momentum is precisely controlled through the parallel type linear ultrasonic motor in the fixing component, and accordingly the magnitude and direction of output torque are controlled precisely; a control circuit is used to drive and control the rotating speed change of the rotating component so as to change the momentum of the rotating component. By using the high-precision and high-response parallel type linear ultrasonic motor, the control moment gyro is long in service life, small in size, lightweight, high in control precision, fast in response, short in action time and especially suitable for the precise control of the posture and rapid maneuver of a small spacecraft.

The invention discloses a combined magnetic bearing. According to the combined magnetic bearing, a casing comprises a circular hollow cavity and has one open end surface; a plurality of mounting hole positions are evenly arranged in the circular hollow cavity at intervals; both large-magnetic-force magnets and small-magnetic-force magnets adopt strip-shaped magnets; the quantity ratio of the large-magnetic-force magnets to the small-magnetic-force magnets is 1:5; the large-magnetic-force magnets and the small-magnetic-force magnets are circumferentially mounted in the corresponding mounting hole positions; all N poles face the circle center; a lead block is arranged in the mounting hole positions for mounting the large-magnetic-force magnets; an inner-ring magnet is arranged in the center of the casing; the outer ring of the inner-ring magnet is an N pole; a front magnetic plate and a back magnetic plate are arranged at two ends of the inner-ring magnet; the front magnetic plate is fixedly mounted on a front cover for sealing the open end surface of the casing; the back magnetic plate is fixedly mounted on the casing; and the outer side of the casing is sleeved with a deep groove ball bearing. Compared with a common bearing, the combined magnetic bearing highlights the advantages of low mechanical wear, low energy consumption, low noise and the like, and the defect that the orthocenter is required to be found is overcome during mounting of a shaft.