563results about How to "High coincidence" patented technology

The invention discloses a speed reduction box for turbine fracturing. The speed reduction box is compact in overall structure, small in volume, light in weight and large in transmission ratio, power is input through a sun wheel shaft small-end gear, speed reducing and torque increasing are performed through engaging between sun wheel shaft large-end gears and planet wheels, the power is output through planet carriers, the gear size and quantity are reduced utilizing the structure of a planet wheel set, the speed reduction box for the turbine fracturing is more suitable for the turbine engine speed reduction requirements, the effect of convenient maintenance can be achieved by opening a cover plate through an observation hole, by means of coordination use of a brake device and a brake pad,equipment can be made to stop running immediately in case of emergency, the equipment and personal safety is protected.

The invention discloses a carbonized bacterial cellulose / magnetic composite wave-absorbing material. The carbonized bacterial cellulose / magnetic composite wave-absorbing material is characterized in that: the material is formed by compounding carbonized bacterial cellulose and a nano-magnetic material, the volume ratio of the carbonized bacterial cellulose to the nano-magnetic material is between 1:20 and 5:1, and the nano-magnetic material is one of ferrite or magnetic metal and alloy thereof. The carbonized bacterial cellulose and the nano-magnetic material are compounded, and an obtained biomass mesh-shaped nano-carbon fiber / magnetic composite material can be taken as an ideal microwave absorbent; the wave-absorbing material has the characteristics of thinness, lightness, width and strongness; the carbonized bacterial cellulose / magnetic composite wave-absorbing material has the advantages of low cost, simple preparation technology, environment-friendliness and the like; and the composite wave-absorbing material has broad application prospect in the field of electromagnetic pollution prevention, radar stealth and the like.

Approximate position matching processing is firstly performed with respect to entire areas of two images of a single same object. Selection is then made to find local area limited regions, between which a degree of shift is high, in the two images, whose positions have been approximately matched with each other by the approximate position matching processing. Position re-matching processing is then performed with respect to at least the local area limited regions, which have thus been selected. The approximate position matching processing may be global position matching processing, local position matching processing, or a combination of the global position matching processing and the local position matching processing.

The invention provides a closed-loop Kalman filter inertial positioning method based on zero velocity update. The method comprises: determining an initial position parameter of a carrier through GPS, and binding into a navigational computer; performing preheating preparation on an inertial navigation system, and acquiring data output by a gyroscope and an accelerometer and processing the data; utilizing the sensitive weight component of a horizontal accelerometer to determine the horizontal attitude angle of the carrier; determining the motion state of the carrier according to accelerated velocity and variance at each discrete moment output by the inertial navigation system; when the carrier is at a static state, employing closed-loop Kalman filter to realize correction on resolution error of the navigation system; and employing location update arithmetic of a rectangular coordinate system to finish high-precision positioning of the carrier.

The invention is suitable for the field of computer vision and provides a three-dimensional reconstruction method and device of a multi-lens camera, a VR (Virtual Reality) camera and a panorama camera. The method comprises the following steps of: obtaining videos shot by each camera in the moving process of the multi-lens camera, wherein the multi-lens camera is a VR camera or a panorama camera comprising at least two cameras; simultaneously extracting key frames from the videos shot by all the cameras and correcting the distortion of each key frame; carrying out three-dimensional reconstruction according to the key frames corresponding to the videos shot by all the cameras to generate point clouds and camera postures of the cameras; and obtaining common point clouds generated by the adjacent cameras and determining scales of all the point clouds according to the common point clouds generated by the adjacent cameras. The method provided by the invention has the advantages that the specific real physical scales can be provided for the point clouds; a wider viewing angle can be provided and a more complete angle can be covered by using the lens of the VR camera or the panorama camera; the coincidence degree of two adjacent lenses is simultaneously increased to provide more common points for determining the scales of the point clouds; and the robustness is increased.

The invention relates to a spectrum confocal type measurement method and device for the thickness of the center of a lens. An existing method and device have large errors and consume much time when carrying out measurement. The measurement method includes the steps that an area-array cameras and a television image are utilized for assisting in centering, the thickness of the center of the optical lens is measured through the spectrum confocal means, accuracy of the measured thickness is ensured, and accuracy of test results is largely improved. The measurement device is additionally provided with a monitor optical way for the process of measuring the thickness of the lens through the spectrum confocal means, the ratio of overlapping of a centering optical way and a measurement optical way is high, unnecessary hardware waste is reduced, and cost of the measurement device is effectively controlled.

Provided are a rigid gear and flexible gear which are used for short-tube flexible-gear harmonic speed reducer and a machining process thereof. Inner teeth of the rigid gear are gear teeth with an inclination angle alpha, the inclination direction of the inclination angle alpha is consistent with the field angle theta2 at the position of a long shaft of the flexible gear, and the inclination angle alpha is 0.1 degree to 2 degrees. Top ends of two tooth profile curve line sections of the outer tooth profile of the flexible gear are connected through a tooth top straight line section. Each tooth profile curve line section is formed by connecting upper circular radius and lower circular radius in smooth transition mode. The harmonic speed reducer comprises the rigid gear, the flexible gear and a wave generator. The ratio of the length and the inner diameter of the flexible gear is smaller than 1. The flexible gear and the rigid gear in the short-tube flexible-wheel harmonic speed reducer are both machined through a slow-feeding wire cutting off machine. The gear teeth of the flexible gear and the gear teeth of the rigid gear are meshed in the certain inclination angle. The total contact area of the meshing teeth pair is increased by 15% compared with the condition where no inclination angle exists. Overlapping ratio of the harmonic gears is improved, and harmonic transmission rigidity is improved.

The invention discloses an image stitching method and apparatus, and belongs to the technical field of image processing. The image stitching method includes the steps: according to a first overlapped area in the current image, determining the main pose parameter of the current image; according to the main pose parameter, projecting the current image to a projection canvas, and obtaining an initial stitched image; in a second overlapped area of the initial stitched image, selecting a local overlapped area, wherein the depth of the depth surface of each object in the local overlapped area is the same; calculating the local pose parameter of the local image area corresponding to the local overlapped area in the current image; and according to the main pose parameter and the local pose parameter, re-projecting the current image to the projection canvas, and obtaining a target stitched image. The image stitching method and apparatus can solve the problem that a terminal projects an image to obtain the initial stitched image only according to the main pose parameter and the main pose parameter may not be suitable for the whole current image, so that the overlapped area of the initial stitched image obtained by the terminal cannot realize good overlapping, and can improve the image stitching effect.

The invention relates to a video camera imaging objective lens. The video camera imaging objective lens is applied in an airborne photoelectric helmet aiming system. From an object side to an imaging surface, the video camera imaging objective lens comprises a diaphragm, a first lens and a crescent-shaped second lens in turn, wherein the first lens has a rear focus of which focal power on one side of the imaging surface is positive; the crescent-shaped second lens has a concave surface which has very high curvature, and the focal power facing one side of the imaging surface is negative; at least one surface of both the first lens and the second lens is a non-spherical surface and is in accordance with conditional formula: 1.3<f / f1<2.1 and -1.9<f / f2<-0.5, wherein f is the focal length of the video camera imaging objective lens; f1 is the focal length of the first lens; and f2 is the focal length of the second lens. The video camera imaging objective lens can correct a spherical aberration and a coma of the airborne photoelectric helmet aiming system. The invention also relates to the airborne photoelectric helmet aiming system with the video camera imaging objective lens.

The invention relates to a lead-connecting device in a power system. The device comprises a hydraulic press binding clip and a hydraulic system matched with the same and is characterized in that a guide rail is fixed on a worktable, a trolley which can move along the guide rail and is provided with the hydraulic press binding clip is mounted on the guide rail, the hydraulic press binding clip is fixed on a fixed plate on the trolley, a lifting device and a guiding device for moving the fixed plate up and down are mounted between the fixed plate and the trolley, a fixed frame is mounted on the worktable at one end of the trolley and provided with a lead-clamping device, a lead-clamping trolley which can move along the guide rail is mounted on a guide rail at the other end of the trolley and is provided with a lead-clamping device, and the lifting device, the guiding device and a tension device which pulls the lead-clamping trolley to move along the guide rail are mounted on the lead-clamping trolley. The invention has the advantages of reasonable structure, convenient use and high working efficiency and lead-connecting quality.

The invention relates to an adjustable LED high-beam and low-beam module. The adjustable LED high-beam and low-beam module comprises a low-beam module, a high-beam module and a linkage module, wherein the low-beam module comprises a low-beam support, independent widening component and light-dark cut-off line component which are connected to the low-beam support, a first bulb dimming mechanism and a second bulb dimming mechanism, the widening component is rotationally installed on a hinge seat of the low-beam support, and the second bulb dimming mechanism is installed on the back part of a first heat dissipater; the first bulb dimming mechanism and a third bulb dimming mechanism which are used for adjusting relative angles of the low-beam module and the high-beam module are installed at the two sides of the back part of the low-beam support; a third heat dissipater and a third reflector of the high-beam module are connected to a high-beam support, and a ball seat is installed on the high-beam support; and a linkage support of the linkage module is connected with a dimming motor, the ball seat and the third bulb dimming mechanism. The adjustable LED high-beam and low-beam module disclosed by the invention is compact in structure, and capable of realizing accurate adjustment for the relative positions of LED and the reflectors, and the relative positions of the high-beam module and the low-beam module, thus a production cost can be reduced.

The invention relates to an augmented reality microscope. The augmented reality microscope comprises an eyepiece (2), an objective lens (3), a spectroscopic device (1) arranged between the eyepiece (2) and the objective lens (3), an image acquisition device (4), an image projection device (5), and an image processing device (6); and the spectroscopic device (1) comprises a first beam splitter (11)and a second beam splitter (12). Through the cooperation of the spectroscopic device arranged between the eyepiece and the objective lens, the image acquisition device and the image projection device, a microscopic image can be captured to the image processing system in real time, and a result image and prompt information of the calculation processing are coincident with a real image meanwhile, so that an operator can observe the processing result and the prompt information while observing the image; therefore, work intensity of the operator is reduced, and detection speed and detection quality can be improved meanwhile.

The invention discloses a tubular pile pull-out test device with a single dowel bar structure. The tubular pile pull-out test device comprises a base, an upper plate, a dowel bar, a centre hole jack and a main beam, wherein the main beam is arranged on the ground through buttresses; the base is positioned below the main beam and is used for connecting the top of a tubular pile sample; the upper plate is positioned above the main beam; the centre hole jack is arranged on the main beam and props against the bottom of the upper plate; the lower end of the dowel bar is connected with the base; the upper end of the dowel bar penetrates through the centre hole jack and is connected with the upper plate. The tubular pile pull-out test device not only has the advantage that in the prior art, a tubular pile pull-out test device can be recycled after being manufactured at one step, but also solves the problem that the pull-out forces of a plurality of dowel bars are inconsistent, facilitates the improvement of the accuracy of the test result, and avoids the pull-out force detection, comparison and adjustment of the dowel bars, thereby improving the testing efficiency.

A motor iron core automatic gluing lamination high-speed stamping grading die comprises an upper die, a lower die, a material guiding plate, an upper die base, an upper cushion plate, a male die cushion plate, a blanking male die, a blanking female die, a concave formwork, a female die cushion plate, a locking ring and a lower die base. The blanking female die is installed in the concave formwork, the locking ring is located below the blanking female die and axially provided with a locking hole, and the blanking female die is opposite to the locking hole. The inner diameter of the locking ring is smaller than that of the blanking female die, the locking ring is placed in the lower die base, a product outlet is arranged below the lower die base, the lower end of the locking hole is communicated with the product outlet, and the motor iron core automatic gluing lamination high-speed stamping grading die further comprises an adhesion module. The locking ring is arranged below the blanking female die, perpendicularity and flatness of an iron core are guaranteed, the coinciding degree of adjacent stamping pieces is high, the locking ring is used for collecting the stamping pieces, and the later period labor cost can be greatly reduced. The upper die is provided with the adhesion module, stamping and adhesion are synchronously performed, and working efficiency is greatly improved. The invention belongs to the technical field of die devices.

The invention discloses a harmonic transmission device for a cycloidal-pin wheel. The device comprises a cam shaft, a flexible bearing, a flexible gear, roller pins and a rigid wheel, the flexible bearing is arranged on the elliptic cam shaft, and the inner circle of the flexible gear is matched with the outer circle of the flexible bearing; the outer tooth surface of the flexible gear is in contact with each roller pin, the roller pins are evenly distributed in a semicircle groove of the rigid wheel, the inner circle of a main bearing is fixedly connected with the flexible gear, and the outercircle of the main bearing is fixedly connected with the rigid wheel. According to the harmonic transmission device for the cycloidal-pin wheel, the high tooth root of a harmonic transmission gear ofthe cycloidal-pin wheel is in a cycloidal tooth profile, the risk of fracture and failure is reduced, the large meshing amount can be obtained without the need of extremely deep meshing distance, thetooth width is large, and all teeth are involved in meshing; the specific pressure of the tooth surface is small, the gear can bear extremely large torque, deformation of the flexible gear is also small, the service life of the flexible gear can be greatly prolonged, and the intensity of the flexible gear can be improved.

The invention discloses a design method for a shrinkage tooth curved-tooth noncircular bevel gear. A knife disk of a standard spiral bevel gear is used as a generating gear, a real tooth surface of the curved-tooth noncircular bevel gear is obtained according to the meshing principle and spatial coordinate transformation, and the generating principle of the curved-tooth noncircular bevel gear is similar to that of a shrinkage tooth spiral bevel gear. The shrinkage tooth curved-tooth noncircular bevel gear designed by the method has a series of advantages that bearing capacity is high, contact ratio is high, and the tooth surface contact area can be regulated; meanwhile, gear ratio transmission of intersecting shafts is achieved, and what is more important is that the shrinkage tooth curved-tooth noncircular bevel gear can be efficiently generated and processed on a five-axis curved-tooth bevel gear milling machine.

The invention discloses a balanced image clustering method based on hierarchical clustering. According to high dimensional feature data of apparel goods images, clusters with balanced sizes are obtained by a method based on hierarchical clustering, and the quantity of data in a single cluster does not exceed a limited threshold value. When in retrieval, after distances among retrieved data and all clustering centers are computed, a plurality of the nearest clusters are selected, and the data are accessed inside the clusters to obtain final research results. Compared with a universal indexing method based on clustering, the method avoids the problem of overlarge accessed data volume when the retrieved data are in large clusters, and ensures research performances. Besides, by accessing a plurality of clusters, the research results and SSA (serial storage architecture) research results have a higher overlap ratio, and research effects are improved.

The invention discloses detection device and method for a service bridge inhaul cable / suspension cable anchor system. The device comprises a detection circuit which is mainly formed by an ultrasonic generation and excitation part, a piezoelectric transducer (6) and a signal collector (7), and a detection mechanism which is mainly formed by a first clamp for fixing an inhaul cable / suspension cable of an anchor system, a second clamp for connecting a transmitting probe and the piezoelectric transducer with the anchor system through a coupling agent (2), and a PC machine. The method comprises the steps as follows: a transmitter obtains working voltage from alternating current through an adjustable transformer and a direct-current rectifier module; the transmitting probe generates an ultrasonic wave under excitation of the voltage, and is introduced into the inhaul cable / suspension cable in an anchor area through the coupling agent; the piezoelectric transducer transforms an ultrasonic wave reflected by the anchor area into a corresponding electric signal; the electric signal is processed and analyzed in the PC machine, so as to obtain defect information of the anchor system. The detection device and method have the advantages of being good in stability, high in detection sensitivity, low in cost, convenient to use and the like.

The invention relates to a hollow photonic crystal optical fiber gas absorption cell device and a manufacturing method thereof. The device comprises a hollow photonic crystal optical fiber, a protective sleeve, a hermetic cabin, a vacuum gauge, a vacuum valve, window glass, a coupling mirror and a regulating component. According to the device disclosed by the invention, the characteristics that the hollow photonic crystal optical fiber is flexible and bendable and gas can be filled into a fiber core are utilized, quantitative injection of gas can be realized by using the hermetic cabin, the vacuum gauge and the vacuum valve, a light beam can enter the hollow photonic crystal optical fiber by being coupled by the coupling mirror and the window glass, and sealing is performed by an optical fiber metalization and feed-through welding process. The device disclosed by the invention has the characteristics of compact and small structure, high reliability, controllable gas pressure, repeated use and high coincidence degree of the section of the light beam and the gas section. The device disclosed by the invention can be used for gas spectroscopic analysis experiments and the gas absorption cell taking the frequency of a frequency stabilized laser as reference.

The invention provides a permanent-magnet rotor deflection-type three-degree-of-freedom motion motor, which relates to the technical field of permanent-magnet rotor motors. The motion motor is characterized in that magnetism isolating sheets and permanent magnets consisted of non-magnetic-conduction materials are distributed on the outer side of the inner core of the rotor. N-poles and S-poles are distributed in a staggered way and the outlines of the permanent magnets are spherical. At least two layers of magnetic pole iron cores are provided on the rotor of the periphery. Stator magnetic pole loops are provided on the magnetic pole iron cores. An output shaft is rigidly connected with center of the stator, the center of an outer housing overlaps with center of the rotor and the rotor is supported by a circular ball bearing fixed on the stator. The stator is provided with a transducer for detecting the position and the speed of the rotor so as to realize closed-loop control of the motor. The motion motor of the invention solves the problems of the three-degree-of-freedom motion motor in the prior art, including heavy abrasion, poor torque output capacity and the like. The motion motor of the invention is relatively simple in structure, easy to control, high in mechanical integration level, small in abrasion, strong in torque output capacity, and excellent in static and dynamic performance. In addition, the motion motor can realize suspension control.

The invention belongs to the technical field of non-circular gears and discloses a design method for a curved-tooth non-circular gear. The tooth profile of the curved-tooth non-circular gear is designed through a generating gear. The tooth profile equation is solved according to the curved surface of a counterpart rack, the kinematic relation of gear generation and the engagement principle. Compared with a straight gear, the curved-tooth non-circular gear designed through the method is high in contact ratio and bearing capacity. Compared with a bevel gear, the curved-tooth non-circular gear designed through the method does not generate axial force in the transmission process and has low requirements on bearings and installation. Through the arc tooth profile of the curved-tooth non-circular gear, lubricating oil is contained in the tooth surface, and therefore a quite good lubricating condition is achieved.

A wearable DOF (dual degrees of freedom) elbow rehabilitation training device relates to elbow rehabilitation training devices and in particular relates to the wearable DOF elbow rehabilitation training device. The wearable DOF elbow rehabilitation training device is used for solving the problem that the existing elbow rehabilitation devices inconveniently improve elbow joint drive and are complicated in structure, relatively low in accuracy and efficiency and poor in adaptability. The wearable DOF elbow rehabilitation training device comprises a forearm, an upper arm, a link assembly, a first motor, a second motor and a connecting plate, wherein the first motor is mounted at one end of the forearm, one end of the connecting plate is connected with a rotating shaft of the first motor, the other end of the connecting plate is connected with one end of the upper arm through the link assembly, and a rotating shaft of the second motor is connected with the link assembly. The invention belongs to the field of medical apparatus and instruments.

The invention discloses a fault-tolerant control method of a permanent-magnet synchronous motor driving system. Under the normal working conditions of a phase-current sensor, the system adopts a normal current hysteresis control mode. When the phase-current sensor is detected to fail, the system enters a fault-tolerant control mode to perform out-phase check for an original switch signal obtained by the normal current hysteresis control mode, if the original switch signal and a last actual switch signal meet the out-phase principle, then the original switch signal directly serves as the actual switch signal to be outputted, and otherwise, the original switch signal is modified according to a minimum current deviation absolute value method so that the actual switch signal is obtained and outputted. The method has the advantages that a hardware structure of an existing driving system is unchanged, and the method is high in reliability, simple, feasible and the like.

The invention relates to an infrared and glimmer multispectral fusion front end optical-mechanical structure, comprising a case, a wedge-shaped pedestal, a first light hole, a second light hole, a video wire, a glimmer image intensifier battery, a glimmer objective lens, a glimmer image intensifier, an infrared objective lens and an infrared detector; wherein the front end of the glimmer objective lens is provided with an optical wedge, the infrared objective lens and the infrared detector jointed behind the infrared objective lens form an infrared detection device, the glimmer objective lens and the glimmer image intensifier connected behind the glimmer objective lens form a glimmer detection device, the wedge-shaped pedestal is fixed in the interior of box body, the infrared detector and the glimmer image intensifier are fixed on the wedge-shaped pedestal, the infrared detection device and the glimmer detection device are placed downward in vertical direction, the optical axle of the infrared objective lens and the glimmer objective lens are in the same vertical plane and in parallel, the included angle of the optical axle is less than or equal to 0.1mRad; and the infrared objective lens and the glimmer objective lens have the same field of view. The structure is easy to process, registration accuracy is high, and imaging effect is good, thus having good market prospect.

The invention provides a steam turbine square steel blade fixture which fixes conveniently and saves materials in processing and is jointed on a driving fixture and a followed thimble on a milling machine by a blade shroud tailstock barrel and a blade root fixture. The rotation center of the blade shroud tailstock barrel and the blade root fixture coincides with the rotation center of the blade. The inner cavities of the blade shroud tailstock barrel and a blade root fixture are the modeling structures of the blade shroud and blade root of the blade. Through fixing the blade by the blade shroud tailstock barrel and the blade root fixture whose centers coincide with the rotation center of the blade, the rotation center of the blade and the milling machine are coincided highly and the processing precision is improved. The fixture does not need drilling the centre holes at two sides of the blade, thus decreasing the procedures and improving the production efficiency.

The invention relates to a method and device for measuring the space of pixels of an image sensor by using a constant-speed movable point target, belonging to the field of the measurement of length, width or thickness by adopting the optical method. The method comprises the following steps: imaging the point target in the constant-speed movement state to obtain a linear image, searching the value taking range of the space of the pixels in the frequency domain, and calculating the space of the pixels by using the search algorithm according to the characteristic that the actual modulation transfer function curve and the theoretical modulation transfer function curve which are relevant to the space of the pixels can coincide best under the least square condition. The device is characterized in that a sliding block which bears the point target is arranged on a first guide rail and a second guide rail, when a controller controls the sliding block to move at constant speed on the first guide rail, the controller also controls the sliding block to move on the second guide rail, the movement in two directions matches with each other so that the point target is imaged on the surface of image sensor by calibrating the focus. Due to the adoption of the method and the device for measuring the space of pixels of the image sensor, the errors between the single-time measurement results can be reduced, and the repeatability of the measurement results can be improved accordingly.

The invention relates to a power transmission mechanism of a helicopter, and particularly relates to a face gear and herringbone-tooth cylindrical gear combined four-way branch transmission mechanism. The four-way branch transmission mechanism has the advantages of large transmission ratio, light mass, high reliability, long service life, high bearing capacity and low noise and is mainly applied to a main speed reducer of the helicopter. In the four-way branch transmission mechanism disclosed by the invention, input shafts are used for transmitting power to a helical cylindrical gear by overrun clutches; the helical cylindrical gear floats in the radial direction and is meshed with an upper face gear and a lower face gear so that power branching is realized, the torque transmitted by a gear pair is reduced, and a reversion function is implemented; the upper face gear and the lower face gear are respectively connected with first and second herringbone-tooth cylindrical gears by driving shafts; the first and second herringbone-tooth cylindrical gears float in the radial direction, so that power is uniformly transmitted to third, fourth, fifth and sixth herringbone-tooth cylindrical gears; thus, four-way branching of the power is realized, the power is gathered on a seventh herringbone-tooth cylindrical gear, and the power is transmitted to a main rotor of the helicopter.

The invention relates to the technical field of medical instrument cleaning equipment, and discloses a medical test tube cleaning device. The medical test tube cleaning device comprises a supporting base, supporting legs are fixedly installed on the two sides of the bottom of the supporting base, and a limiting strip is fixedly installed at the bottom of an inner cavity of the supporting base. According to the medical test tube cleaning device, an adjusting device is arranged to cooperate with a measuring scale for calibration adjusting, accordingly, the situation that after medical test tubesare cleaned for a long time, the positions of the medical test tubes and the position of a cleaning device deviate is avoided, the positions of the medical test tubes are regularly adjusted, the effect that positions of the medical test tubes are relatively perpendicular to the positions of cleaning brushes, thus, the inner cleaning quality of the medical test tubes is improved, and the accuracyof the detection result is improved; and through the adjusting effect of a boosting device and the limiting effect of limiting blocks and limiting grooves, an object stage can be adjusted to integrally move upwards conveniently, the medical test tubes are conveniently pushed upwards to coincide with the cleaning brushes, and the cleaning brushes can conveniently conduct brushing.

The invention discloses a torque sensor calibrating method comprising the following steps: 1) a to-be-calibrated torque sensor is installed on a calibrating stand; 2), counterweights are loaded on an end of a long arm, and meanwhile, a leveling cylinder is used to support a leveling short arm; lifting-up of the leveling short arm is carried out by the leveling cylinder until the loading long arm returns to a horizontal state; 3), the step 2) is repeated and an output voltage of the to-be-calibrated torque sensor is recorded; 4), one counterweight is unloaded, and adjusting is carried out on the leveling short arm through utilization of the leveling cylinder until the loading long arm returns to the horizontal state, and the output voltage of the to-be-calibrated torque sensor is recorded; 5), the step 4) is repeated until the unloading finishes and one calibrate cycle ends; 6), a calibrating model is established and subjected to resolving to obtain calibration coefficients; and 7) the step 2) to step 6) are repeated for five times to examine repeatability of the data. The method of the invention is simple in calibrating operation, high in calibrating precision, low in calibrating cost and strong in applicability.

The invention relates to a reducer, in particular to an RV reducer comprising a constant-depth tooth spiral bevel gear. One end of a pin gear casing is provided with an input planet carrier and the other end is provided with an output planet carrier; the input planet carrier and the output planet carrier are constructed to rotate within the pin gear casing after being fixedly connected; the internal wall of the pin gear casing is provided with a rolling pin; a pair of cycloidal gears are arranged between the input planet carrier and the output planet carrier and are constructed to be engaged with the rolling pin; a planetary gear is arranged on the output planet carrier; the center of the output planet carrier is provided with an input shaft which is engaged with the planet gear; the central shaft of the planet gear is provided with a crank shaft; the crank shaft is constructed to rotate on the input planet carrier and the output planet carrier; the pair of cycloidal gears are hinged to the crank shaft; the input shaft drives the crank shaft through the planet gear; the crank shaft drives the pair of cycloidal gears; the pair of the cycloidal gears drive the output planet carrier. The RV reducer comprising the constant-depth tooth spiral bevel gear is small in noise, high in first-level transmission contact ratio, stable in transmission, uniform in stress, compact in structure and can obtain small elasticity backlash.