37results about How to "Eliminate mechanical errors" patented technology

The invention discloses a position detecting system for the edge of a winding-up H-shaped wheel of a wire drawing machine and a control method thereof. The method comprises the following steps that: (1) two extreme positions are calibrated; in the process that a controller adopts a motor to drive a bracket to move on a lead screw, the controller acquires distances from displacement sensors to theinner edge of the H-shaped wheel by the two displacement sensors and calibrates the two extreme positions according to the distances; angle values of encoders corresponding to the two extreme positions are acquired; and (2) the bracket is controlled to do reciprocating movement between the two extreme positions, and the controller drives the bracket to move along the lead screw by the motor, and controls the motor to rotate reversely when the bracket reaches the extreme positions, so that the purpose that the bracket moves between the two extreme positions in a reciprocating manner till the wire arranging procedure on the H-shaped wheel is finished. The position detecting system has the characteristics of high detection accuracy and easiness in implementation and the like and can effectively avoid the phenomenon of wire stacking at the edge of the H-shaped wheel.

The present invention relates to an embedded polarization state measuring apparatus, which is composed of a detection unit (1), liquid crystal type adjustable-phase delayer(s) (3, 4), a polarization beam-splitting prism (5), a collective lens (6), a photo detector (7) arranging in a shaft of a first part of the detection unit (1); a collective lens (8) and a photo detector (9) arranging in a shaft of a second part being orthogonal with the first part; a control unit (2) containing a signal-collection and liquid crystal control module (10), a data treatment module (11), a display module (12) and a RS232 serial port (13). By means of replacing rotational wave sheet by the liquid crystal type adjustable-phase delayer, It is able to control polarization state of incident light and measure Stokes parameter for real time quantity of polarization state accurately, and to overcome mechanical vibration problem; it is used for collimation of optical element(s), measurement of optical phase delay, material representation, medicament development, communication equipment, ellipse polarization instrument and spectrum application as well as space optical communication.

The invention discloses a video monitoring focusing method and a video monitoring focusing device. The method comprises the steps of computing positions of motors at a short focal end and a long focalend of a lens according to a statistical operator corresponding to the definition of a video monitoring image; computing a motor drive step length corresponding to a mechanical error according to thestatistical operator corresponding to the definition of the video monitoring image, and computing the motor drive step lengths corresponding to the mechanical errors at different positions of the motors; performing focusing curve fitting according to the statistical operator from the short focal end to the long focal end of the lens; and when a scene changes or focusing is artificially triggered,continuously performing the computation of the definition operator on the re-acquired video monitoring frame according to the current video monitoring image definition statistical operator and the current position drive motor to acquire a new focusing position, continuously cycling until the motor position with the highest definition is found, and thus completing the focusing. According to the method and device provided by the invention, the production process can be simplified, the production efficiency can be improved, the video monitoring focusing is changed to be automatic from being artificial, the labor is saved, and the point light source focusing effect can be enhanced.

The invention discloses a packaging method of a semiconductor laser array single chip. The packaging method comprises the following steps: 1) an aluminum nitride heat radiating fin is cut according to size of a semiconductor laser bar; 2) the aluminum nitride heat radiating fin and an oxygen-free copper heat sink block are welded together, and the aluminum nitride heat radiating fin are cut according to a single chip arrangement period so that an electrical insulating groove is formed; 3) the aluminum nitride heat radiating fin, a welding material and the bar are pressed together by using a mechanical clamp and an aluminum oxide ceramic pad and then arranged in a high-temperature backflow furnace to weld; 4) the bar is cut by using a high-speed rotary cutting piece along direction of the electrical insulating groove so that a chip on the bar is changed into independent single chips; and 5) a cathode of one single chip is connected with an anode gold wire of the adjacent single chip by using a wire bonding machine, and the cathode of one end of the integrated chip and the anode of the other end are respectively connected with an electrode piece of the oxygen-free heat sink block so as to be preparedly connected with an external power supply. The packaging method is long in the service life, simple in process, small in volume, great in stability, high in power and wide in application.

The invention provides a method for manufacturing a panda polarization-maintaining optical fiber preform. The method comprises the following steps: manufacturing an optical fiber core rod; manufacturing polarization-maintaining stress rods; symmetrically and fixedly arranging two polarization-maintaining stress rods at both sides of the core rod according to needs of the stress distribution; carrying out over-cladding deposition on the core rod and the polarization-maintaining stress rods by virtue of an outside deposition method to obtain a preform soot; and sintering the preform soot to obtain the polarization-maintaining optical fiber preform of which the cross section is circular. According to the method for manufacturing the panda polarization-maintaining optical fiber preform, the fiber core and the stress rods are subjected to over-cladding deposition by virtue of the outside deposition method so as to obtain the polarization-maintaining optical fiber preform, and thus the preform cracking defects and mechanical error caused by processing the optical fiber preform through a mechanical drilling method are eliminated and the accuracy and efficiency of processing the optical fiber preform are increased.

A movement control apparatus for a heliostat device may include a step motor, a decelerating motor, a ball screw assembly, a nut, a connecting shaft, and a linear moving shaft. In one embodiment, the nut is movably connected with the ball screw assembly and is secured on a first connecting board and a second connecting board through the connecting shaft. The nut is driven by the ball screw assembly to travel along the screw shaft and since the nut is connected to the connecting boards through the connecting shaft, and the connecting boards are connected to the moving shaft, the movement of the nut can further drive the connecting shaft to rotate to drive the moving shaft to move in a linear manner on the sliding rail to rotate a mirror assembly of the heliostat around a post.

The invention relates to the measurement technical field, in particular to a measurement method. The measurement method comprises the steps as follows: (1) a plurality of measurement lenses are distributed by aiming at different measurement positions of an object to be measured, and all measurement lenses are fixed after being aligned; (2) the object to be measured is moved away, a grid coordinate plate is inserted, and a plurality of measurement lenses are respectively corresponding to a coordinate in the coordinate system which is marked as a datum point; (3) the grid coordinate plate is moved away, another object of the same kind to be measured is arranged on the measurement platform, a plurality of measurement lenses automatically focus on the article to be measured, and the practical coordinate of the practical measurement position of the article to be measured is converted by the datum coordinate of the measurement lenses; (4) a planar profile or a solid profile of the object to be measured is virtually configured in a micro-computer according to the gained practical coordinate, thus gaining the practical parameters of the object to be measured and memorizing the practical parameters into the micro-computer. The measurement method replaces the single-lens movement of single-lens with that of the multi-lens movement, reduces the operation of movement and focusing, improves the measurement speed, and eliminates the mechanical errors which are caused by movement.

The invention discloses a 3D building printing head. The 3D building printing head comprises a hollow printing head body, a feeding device and a nozzle which is mounted at the bottom of the printing head body and is in butt joint with a hollow cavity of the printing head body. At least two sets of bearing assemblies arranged in an up-and-down staggered manner are mounted on the outer wall of the printing head body in a sleeving manner. The outer wall of each bearing assembly is correspondingly connected with a printing head connecting frame used for being connected with printing equipment. Each printing head connecting frame and the other printing head connecting frame adjacent to the printing head connecting frame can relatively rotate with the printing head body as the axis, and the intersection angle of the two printing head connecting frames can be changed. Meanwhile, the invention provides a mobile 3D building printing device. The 3D building printing head and the mobile 3D building printing device can be conveniently moved to a construction site for directly printing a 3D building, and movement, assembly and debugging are convenient. The loading force and stability of combined mechanical arms are increased, the feed amount is larger, the movement speed is high, the repeated locating precision is high, and the printing speed and printing quality are improved; and the mechanical arms can be longer, and larger buildings can be printed out.

The present invention is applicable to the field of optoelectronic technology, and provides a self-reference measuring device; the self-reference measuring device comprises an excitation unit, a firstoptical path adjusting unit, a soliton generating unit, a second optical path adjusting unit and a multiphoton microscope unit. The excitation unit is used for generating pump light with a preset wavelength and allowing the pump light to enter the first optical path adjusting unit; the first optical path adjusting unit is used for adjusting the polarization state of the pump light and allowing the pump light to enter the soliton generating unit, the the soliton generating unit is used to generate a laser pulse according to the pump light and allow the laser pulse to enter the second optical path adjusting unit; the second optical path adjusting unit is configured to process the laser pulse and allow the laser pulse to enter the multiphoton microscope unit, and the multiphoton microscope unit is used for measuring axial chromatic aberration based on imaging of a sample and transmitting harmonic signals to a signal collection unit for collection. The self-reference measuring device doesnot require a mechanical displacement platform to repeat scanning all the time, thereby eliminating mechanical errors introduced by the displacement platform when monochromatic excitation light repeatedly scanns.

The invention discloses a special tool for manual turning of a steam turbine. The special tool comprises a handle, a straight gear installed on the handle, a U-shaped perforated support seat installed on the handle in a sleeving manner and used for fixing the position of the straight gear, a fixed base fixed on the U-shaped perforated support seat, and a slide base installed on the handle in a sleeving manner, wherein a nut is welded at one end of the handle or welded at each of the two ends of the handle. The special tool disclosed by the invention is simple in structure, and convenient to detach and install; an electric driving operation is not needed, thus the working efficiency of manual turning is improved; a rotor is turned 90 degrees in place every time, high efficiency and reliable accuracy are achieved, and the mechanical error generated during centring of the rotor of a steam-turbine generator due to a high jitter degree of rotor turning is eliminated; therefore, the numerical precision of centring is improved, the labour intensity of operating personnel is greatly reduced, and the personal injury accidents and equipment damage accidents generated during steel wire rope winding are avoided.

The invention discloses an open-loop positioner and an error elimination method for measurement, and relates to a height measurement device and a measurement error elimination method thereof. The open-loop positioner comprises a vertical guide rod and a testing datum plane connected with the same. A distance measuring sensor is connected to the vertical guide rod in a transversely sliding manner, and is electrically connected with a data collector. A servo motor is arranged on the vertical guide rod and drives the distance measuring sensor to slide in the vertical guide rod up and down. Positioning errors and mechanical errors are eliminated skillfully by utilization of the open-loop positioner. By means of open-loop control and through the simple positioner and structure, accurate positioning of the distance measuring sensor is achieved, and the corresponding measuring method is convenient to operate and high in accuracy.

The invention discloses a control method, device and equipment of probe scanning and a storage medium, and belongs to the technical field of ultrasonic imaging. The control method comprises the stepsthat a first time difference and a second time difference are obtained; the delay time of the N swing scanning is determined according to the first time difference and the second time difference;and after the reference time and the delay time, an acoustic head is controlled to start transmitting a scanning line of the N swing scanning. According to the control method, the delay time is adjusted based on the first time difference and the second time difference, the transmitting time of the scanning line in the swing scanning is adjusted according to the delay time, thus mechanical error is eliminated, the scanning area of the same group of scanning lines in the forward swing scanningis aligned with the scanning area in the reserve swing scanning, and the problem of four-dimensionalimage dithering caused by the mechanical error of the probe is solved.

The present invention discloses a wheel diameter correction method based on an intelligent patrol robot. The method comprises the following steps: obtaining a deviation distance, an actual operation distance and a straight-line distance; calculating an operation radius and an operation angle; calculating an inside radius and an outside radius according to a wheel diameter; calculating an actual operation speed difference between left-side wheel(s) and right-side wheel(s) according to an operation time; and multiplying the actual operation speed difference and a compensation coefficient as a speed compensation value to correct operation speed(s) of the left-side wheel(s) and the right-side wheel(s). According to the method, by calculating the actual operation speed difference between the left-side wheel(s) and the right-side wheel(s) of the intelligent patrol robot, when the intelligent patrol robot is tested before leaving the plant, the mechanical differences of the four wheels of therobot can be found rapidly, and thus the method is convenient for configuring software parameters timely and allowing the product meet plant-leaving requirement(s); and in the actual use, by dynamically adjusting motion parameters of the four wheels in the motion process, mechanical errors and the errors caused by abrasion are eliminated, and thus the robot can keep moving on a given track accurately.

The invention discloses a full-automatic foam thin cutting device. The full-automatic foam thin cutting device comprises a rack, a foam feeding mechanism and a cutting mechanism, wherein the foam feeding mechanism and the cutting mechanism are arranged on the rack; the foam feeding mechanism comprises a feeding base and a driving device for driving the feeding base to move; the cutting mechanism comprises a band knife support, an annular band knife device installed on the band knife support, a band knife operation precision control device and an inching feeding control device; and the annularband knife device uses a band knife to cut a foam part, the band knife operation precision control device controls the stability and precision of the band knife during cutting, and the inching feedingcontrol device controls the cutting position of a band knife cutting edge. According to the full-automatic foam thin cutting device, the continuously running annular band knife is used for cutting the foam part, the running precision of the band knife is controlled, and meanwhile, the band knife and the feeding base are controlled and matched through the inching feeding control device, so that cutting marks are prevented from being left on the cutting surface by a band knife joint, uniform slicing is realized, the cutting surface is smooth and flat, few chips are generated in the cutting process, and environmental protection and health are achieved.

The invention discloses an electronically-controlled gasoline injection system for motorcycles. The system comprises an electronic control unit, an engine operation condition data collection subsystem, an electronic throttle valve control subsystem, a common rail gasoline injection subsystem and a digital ignition subsystem. According to the system, the electronic control unit serves as a control center, and optimal working parameters are obtained through data collection of the engine operation condition data collection subsystem; according to the shifting degree of an accelerator, the electronic control unit adjusts the air inflow of an electronic throttle valve by driving and controlling a stepping motor; according to the fuel output pressure, the electronic control unit adjusts the fuel injection quantity and the fuel injection time by controlling the common rail gasoline injection subsystem; and according to the position of an engine crankshaft, the electronic control unit controls the ignition time and the charging time of a high pressure pack through the digital ignition subsystem. Thus, fuel injection and ignition can be accurately controlled, the air-fuel ratio can be controlled in real time, an engine can work on the optimum condition, and fuel conservation and emission reduction of the motorcycles can be realized.

The invention discloses railway track detection equipment. The equipment comprises two detection vehicles which are used for conducting multiple detective operations on railway tracks and arranged on two abreast railway tracks in a gliding mode, a cross girder expansion device which is flexibly mounted between the two detection vehicles and in a ligature direction of the two detection vehicles, and used for connecting the two detection vehicles and adapting to gauge changes between the two railway tracks, wherein the cross girder expansion device includes a long shaft extending in the ligature direction of the two detection vehicles, and both ends of the long shaft are rotatably connected with one group of flexible component of the cross girder respectively; two groups of the flexible components of the cross girder are arranged symmetrically to the midpoint of a lengthwise direction of the long shaft, and each of the flexible components of the cross girder is connected to a corresponding detection vehicle in a detachable mode. The railway track detection equipment has the advantages of being easy to carry, convenient to push forward during detection, simple in operation during detection, and the measuring basis of the railway track detection equipment is sole, therefore the influences of mechanical errors are able to be eliminated, and the accuracy of measurement is improved extremely.

The invention relates to the measurement technical field, in particular to a measurement method. The measurement method comprises the steps as follows: (1) a plurality of measurement lenses are distributed by aiming at different measurement positions of an object to be measured, and all measurement lenses are fixed after being aligned; (2) the object to be measured is moved away, a grid coordinateplate is inserted, and a plurality of measurement lenses are respectively corresponding to a coordinate in the coordinate system which is marked as a datum point; (3) the grid coordinate plate is moved away, another object of the same kind to be measured is arranged on the measurement platform, a plurality of measurement lenses automatically focus on the article to be measured, and the practicalcoordinate of the practical measurement position of the article to be measured is converted by the datum coordinate of the measurement lenses; (4) a planar profile or a solid profile of the object tobe measured is virtually configured in a micro-computer according to the gained practical coordinate, thus gaining the practical parameters of the object to be measured and memorizing the practical parameters into the micro-computer. The measurement method replaces the single-lens movement of single-lens with that of the multi-lens movement, reduces the operation of movement and focusing, improvesthe measurement speed, and eliminates the mechanical errors which are caused by movement.

The invention discloses a rotary fixture positioning method. The rotary fixture positioning method is characterized in that a positioning plate is arranged between a fixture and a processing tool; after a workpiece to be processed is clamped on the fixture, when a first surface of the workpiece to be processed is processed, the workpiece to be processed is placed on the positioning plate firstly by the fixture, a pressure sensor on the positioning plate obtains a first definite numerical value which is inputted into a control device of the fixture, and the control device takes the numerical value as a standard coordinate of the fixture; after processing of the first surface of the workpiece to be processed is completed, when a second surface of the workpiece to be processed is processed, the workpiece to be processed is placed on the positioning plate to stop until a numerical value of pressure sensor reaches the first numerical value, and then second surface processing coordinate positioning is completed. The rotary fixture positioning method has the advantages that by the aid of the positioning plate, mechanical error can be eliminated effectively by determining position coordinates of the surfaces to be processed according to the pressure values, so that start processing coordinates of the surfaces to be processed are in the same standard; the rotary fixture positioning method is simple in principle structure, convenient to operate and high in practicality.

The present application discloses a probe scanning control method, device, equipment and storage medium, which belong to the technical field of ultrasonic imaging. The method includes: acquiring the first time difference and the second time difference; determining the delay time of the Nth swing scan according to the first time difference and the second time difference; after the reference time and the delay time have elapsed, controlling the sound head to start transmitting the Nth time The scan line of the secondary swing scan. The present application adjusts the delay time based on the first time difference and the second time difference, and adjusts the launch time of the scanning line in the swing scanning according to the delay time, thereby eliminating mechanical errors, so that the same group of scanning lines scans during the forward swing scanning. The scanned area is aligned with the scanned area during reverse swing scanning, which solves the problem of four-dimensional image jitter caused by the mechanical error of the probe.

The invention discloses a target tracking method, a terminal, and a readable storage medium of a photoelectric tracker, belonging to the field of photoelectric detection, including judging that the target is in a moving state, controlling the tracking line of the photoelectric tracker to follow the target to move; collecting the work of the photoelectric tracker parameters, and eliminate the mechanical error in the working process of the photoelectric tracker; obtain the stable tracking time, and judge whether the stable tracking time is greater than the set stable time; if it is less than, use the digital second-order loop tracking algorithm to calculate the feedforward compensation amount, If it is greater than, calculate the final tracking feed-forward compensation amount, and repeat the tracking of the moving target; the present invention eliminates mechanical errors caused by mechanical vibration, etc., and improves the accuracy of data output; then calculates the stable tracking time and compares it with the stable time , if the stable tracking time cannot meet the temperature time, then change the stable tracking time by superimposing the feedforward compensation amount to obtain the final tracking feedforward compensation amount.

The invention discloses a target tracking method of a photoelectric tracker, a terminal and a readable storage medium, and belongs to the field of photoelectric detection. The method comprises the steps that it is judged that a target is in a moving state, and a tracking line of the photoelectric tracker is controlled to move along with the target; working parameters of the photoelectric tracker are collected, and mechanical errors in the working process of the photoelectric tracker are eliminated; stable tracking time is obtained, and whether the stable tracking time is greater than set stable time or not is judged; and if yes, the feed-forward compensation amount is calculated through a digital second-order loop tracking algorithm, and if not, the final tracking feed-forward compensation amount is calculated, and tracking of the moving target is executed repeatedly. Mechanical errors caused by mechanical vibration and the like are eliminated, and the data output precision is improved; and then stable tracking time is calculated, the stable tracking time is compared with the stable time, and if the stable tracking time cannot meet the temperature time, the stable tracking time is changed by superposing the feed-forward compensation amount to obtain the final tracking feed-forward compensation amount.

The invention discloses a position detecting device for the edge of a winding-up H-shaped wheel, which comprises a bracket, a wire guiding wheel, a lead screw, a motor, a position detecting end, an encoder and two displacement sensors, wherein the two displacement sensors are used for detecting the axial distance between the wire guiding wheel and the H-shaped wheel; the position detecting end is arranged on the bracket; the lead screw is in transmission connection with the motor; the encoder is arranged on the lead screw; the lead screw penetrates through the bracket; the wire guiding wheel is arranged on the bracket; and the two displacement sensors are arranged at the position detecting end along the axial direction of the H-shaped wheel. According to the position detecting device, the detecting accuracy is high and the structure is simple.

The invention relates to a tank simulating terminal which can simulate a fire interaction process with various types of battlefield targets and provide a data basis for simulating warring effect assessment and situation display. The tank simulating terminal specifically comprises an in-cabin machine, a host, a percussion device, a laser receiving part, a laser transmitting part and a simulating representation part; the laser receiving part comprises hexahedral probes which are mounted on the periphery of the tank and a combination probe which is mounted at the top of the tank; the laser transmitting part is a vehicle-mounted transmitter which is mounted on real equipment; the simulating representation part comprises a buzzer which is used for representing the hit each time, a smoke candlelauncher and a flash lamp which are used for representing the damage of the tank, and an acousto-optic projectile launcher which is used for representing a gun firing effect; the percussion device, the buzzer and the host are respectively and electrically connected with the in-cabin machine; the hexahedral probes, the combination probe, the acousto-optic projectile launcher, the flash lamp, the smoke candle launcher and the vehicle-mounted transmitter are all electrically connected with the host; a laser module which is driven by two motors is arranged in the vehicle-mounted transmitter.

The invention discloses a position detecting system for the edge of a winding-up H-shaped wheel of a wire drawing machine and a control method thereof. The method comprises the following steps that: (1) two extreme positions are calibrated; in the process that a controller adopts a motor to drive a bracket to move on a lead screw, the controller acquires distances from displacement sensors to the inner edge of the H-shaped wheel by the two displacement sensors and calibrates the two extreme positions according to the distances; angle values of encoders corresponding to the two extreme positions are acquired; and (2) the bracket is controlled to do reciprocating movement between the two extreme positions, and the controller drives the bracket to move along the lead screw by the motor, and controls the motor to rotate reversely when the bracket reaches the extreme positions, so that the purpose that the bracket moves between the two extreme positions in a reciprocating manner till the wire arranging procedure on the H-shaped wheel is finished. The position detecting system has the characteristics of high detection accuracy and easiness in implementation and the like and can effectively avoid the phenomenon of wire stacking at the edge of the H-shaped wheel.

The invention discloses railway track detection equipment. The equipment comprises two detection vehicles which are used for conducting multiple detective operations on railway tracks and arranged on two abreast railway tracks in a gliding mode, a cross girder expansion device which is flexibly mounted between the two detection vehicles and in a ligature direction of the two detection vehicles, and used for connecting the two detection vehicles and adapting to gauge changes between the two railway tracks, wherein the cross girder expansion device includes a long shaft extending in the ligature direction of the two detection vehicles, and both ends of the long shaft are rotatably connected with one group of flexible component of the cross girder respectively; two groups of the flexible components of the cross girder are arranged symmetrically to the midpoint of a lengthwise direction of the long shaft, and each of the flexible components of the cross girder is connected to a corresponding detection vehicle in a detachable mode. The railway track detection equipment has the advantages of being easy to carry, convenient to push forward during detection, simple in operation during detection, and the measuring basis of the railway track detection equipment is sole, therefore the influences of mechanical errors are able to be eliminated, and the accuracy of measurement is improved extremely.

The invention relates to the technical field of material analysis, and discloses a material analysis and detection method based on an image recognition technology, which mainly comprises a to-be-detected part information acquisition step, a spectral image acquisition step and a spectral image comparison and result judgment step. Compared with an existing manual mode for analyzing the spectrum of the part material, the method has the advantages that the growth difficulty and period of professional skill talents are reduced, the whole analysis process does not depend on the professional skill level of detection personnel any more, the accuracy of the analysis result is higher, and the accuracy of the analysis result is improved through automatic acquisition and analysis of the spectrum image. And the labor intensity of detection personnel is also reduced.

The invention discloses an inclinometry device, which comprises a plurality of inclinometry pipes capable of being freely expanded, a plurality of inclinometry units installed on the outer walls of the inclinometry pipes and connected in a bus mode, and a ground transceiving controller in communication connection with the inclinometry units, wherein each inclination measuring unit comprises an inclination angle sensor, an inclination angle data processing unit in communication connection with the inclination angle sensor, and a first butt joint plug and a second butt joint plug which are connected to the two ends of the inclination angle data processing unit through data lines; and the adjacent inclination angle sensors are connected in an inserted mode through a first butt joint plug and a second butt joint plug which are correspondingly arranged so as to transmit data, and the inclination angle sensor at the topmost end is connected with the ground transceiving controller in an inserted mode through the first butt joint plug so as to transmit data. According to the inclinometer device, the matching error of a traditional inclinometer rod and a traditional inclinometer pipe can be effectively eliminated, and the measurement precision is improved.

The invention discloses a focusing method and device for video monitoring. The method includes: calculating the positions of the short-focus end of the lens and the motor position of the long-focus end of the lens according to a statistical calculator corresponding to the definition of the video monitoring image; The statistical calculator calculates the motor drive step length corresponding to the mechanical error, and calculates the motor drive step length corresponding to the mechanical error at different positions of the motor; from the short-focus end of the lens to the long-focus end of the lens, the focus curve is fitted according to the statistical calculator; when the scene changes Or when the focus is manually triggered, the motor is driven according to the current video surveillance image definition statistics calculator and the current position of the motor, and the calculation of the definition operator is continued on the regained frame of video surveillance image to obtain a new focus position, and the cycle continues Until the motor position with the highest definition is found, the focus is completed. The invention can simplify the production process, improve the production efficiency, change the focus of video monitoring from manual to automatic, save manpower, and improve the focusing effect of point light sources.