283 results about "Vertical straight line" patented technology

The invention relates to a laser rotary-cut drilling device. The output end of a laser is provided with a beam expander; the output end of the beam expander is provided with a 45-degree total reflection mirror; the output end of the 45-degree total reflection mirror is provided with an optical rotation system; the optical rotation system comprises a first wedge prisma, a second wedge prisma, a third wedge prisma and a fourth wedge prisma; the first wedge prisma and the second wedge prisma have the same wedge angles; the first wedge prisma or the second wedge prisma is connected with a vertical straight-line motion mechanism; the third wedge prisma and the fourth wedge prisma have the same wedge angles; the third wedge prisma or the fourth wedge prisma is connected with a rotation mechanism; the output end of the optical rotation system is provided with a focus lens; and the focus lens is just opposite to a processing platform. The device is used for performing laser rotary-cut drilling on a workpiece, and can process straight holes, variable taper holes and irregular taper holes, so a laser drilling effect of variable sizes, controllable taper and smooth edges is achieved.

The invention discloses a vehicle quarter simulated suspension system and a damper characteristic composite test bench, consisting of two parts of a whole frame-based suspension system test bench and a damper characteristic test bench which are comprised relatively a mechanical bench part, an electric excitation part and a computer control part. The invention is capable of performing characteristic test, ordinary passive and semi-active quarter suspension characteristic test of various dampers, and development test of semi-active suspension controller. Using frame structure and vertical straight ball slide, and with simple and stable bench structure, little mechanical friction and convenience for adjusting suspension parameter, it is capable of using various suspension parameter in computer simulating calculation in the test, which enables good connection between numerical simulation and test validation, thereby improving the effect of the suspension performance test and semi-active suspension controller development test.

The invention relates to a side rod control device with three degrees of freedom. The device is provided with a pitch control mechanism, a roll control mechanism and a front wheel turning control mechanism which are arranged along three mutually vertical straight lines, wherein the front wheel turning control mechanism is rotatably arranged on a first fixing part through one of a pitch control shaft of the pitch control mechanism and a roll control shaft of the roll control mechanism; and the first fixing part is rotatably arranged on a second fixing part through the other of the pitch control shaft of the pitch control mechanism and the roll control shaft of the roll control mechanism.

The invention discloses a three-dimensional printing model placing required support amount rapid estimation method. The method comprises the following steps: inputting a three-dimensional model file, needing estimation of support amount, and support generation parameters; if the model grows along the Z axis, calculating a minimum axis parallel envelope rectangle B in an XY plane; making equidistant parallel filling lines of the X axis and the Y axis in the B and with d being an interval to obtain a series of grid units and nodes; making vertical straight lines passing the nodes respectively, calculating intersection points of the lines and the model, recording normal direction of each surface patch, where each intersection point locates, and ranking the intersection points on each line from small to big based on the Z coordinates; for the intersection points, the serial number of which is odd, if the inclination angle of one surface patch corresponding to one intersection point is smaller than a critical value, recording the distance between the point and the closest point therebelow; and accumulating the recorded line length, and multiplying the total line length and grid unit area to obtain support amount volume and outputting the support amount. The method can estimate the model required support amount quickly, and is especially suitable for model intelligent optimization placing calculation needing a lot of iteration.

The invention discloses a forward shift rotational collision prevention type car carrying device which mainly solves the problem of vehicle movement during the intensive parking process of a front row and a back row or an upper layer and a lower layer. The invention comprises a car carrying board which bears the weight of a car and a controller which controls movement of the car carrying board, wherein, a guide mechanism which restricts the car carrying board to move along a vertical straight line-circular arc-horizontal straight line type track in a plane is arranged between the car carrying board and the ground; a power plant which drives the car carrying board to move along the movement track is arranged at the bottom of the car carrying board and always provides forward shift and rotational power during the moving process of the car carrying board. The power plant drives the car carrying board to move forward to a corresponding position along the guide mechanism, drives the whole car carrying board to rotate 90 degrees, and then drives the car carrying board to move in place along a vertical straight line of the guide mechanism, thereby the aim of collision prevention is realized, and the car carrying device is favorable for conveniently parking and fetching the car. Moreover, when car carrying devices of the invention are arranged in rows in a parking garage according to parking stall number, car parking quantity can be greatly increased, and parking of the front row and the back row, and the upper layer and the lower layer can be conveniently realized.

An ultrasound diagnostic apparatus includes a transmitting and receiving unit that transmits an ultrasound wave to a target object and receives the ultrasound wave as ultrasound data reflected from the target object including a long axis direction blood vessel. An image generation unit generates an ultrasound image as a sectional image of the blood vessel. A region of interest (ROI) setting unit sets a first ROI on a vertical straight line at a right angle to the long axis direction and a second ROI on a wall of the blood vessel displayed at a designated time. A tracing unit traces movement of tissue in the target object corresponding to the first and second ROIs from the designated time to sequentially following thereafter by a gradient method using a spatial brightness gradient. A second memory unit stores information of the movement of the tissue for a predetermined duration.

The invention discloses a welding device for pipeline sealing connection. The welding device for pipeline sealing connection comprises a base, a locating plate, a rotating mechanism, a welding mechanism and clamping and locating mechanisms. The base is connected with the locating plate through a stand column and a threaded rod. First motors are arranged at the top end of the threaded rod, and a lifting plate is connected between the stand column and the threaded rod in a moving mode. The rotating mechanism is connected to the lifting plate in a rotating mode, and the welding mechanism is connected to the rotating mechanism. A lower locating platform and an upper locating platform are arranged on the top surface of the base and the bottom surface of the locating plate correspondingly, and the clamping and locating mechanisms are arranged on the lower locating platform and the upper locating platform. Two pipeline test pieces are limited in the upper clamping and locating mechanism and the lower clamping and locating mechanism correspondingly and located on the same vertical straight line. The welding device for pipeline sealing connection is simple in structure and high in practicability, can conduct clamping and locating operation on two pipelines in the up-and-down direction, and can also adjust the height and the position of a welding mechanism, the requirement for sealing welding of pipelines with different lengths is met, the practicability of the welding device is greatly improved, and the working range of the welding device is greatly broadened.

The invention discloses an elevator door light curtain detection protection device. The elevator door light curtain detection protection device comprises a detection light eye, a driving mechanism, a transmission mechanism, a control module and a light eye position detection unit; the detection light eye comprises a transmitting end light eye and a receiving end light eye; the transmission mechanism is connected with the driving mechanism and driven by the driving mechanism to drive the transmitting end light eye and or the receiving end light eye to move in a reciprocating mode; the movement speed of the detection light eye is larger than the speed that a user is in or out of an elevator door; the light eye position detection unit is used for determining the movement position of the detection light eye; the control module is connected with the detection light eye and the light eye position detection unit and used for processing a light eye detection signal and a light eye movement position signal. According to the elevator door light curtain detection protection device, the reciprocating movement namely the vertical straight line reciprocating movement or vertical reciprocating swing is performed on the detection light eye through the driving mechanism and the transmission mechanism and accordingly the detection coverage of a light curtain is greatly improved and the blind area can even be avoided through the control on the driving mechanism and accordingly the safety performance of the elevator is greatly improved.

The invention discloses a method for arranging multiple vibration isolators. In the method, an equipment installation platform is arranged according to the gravity of each equipment in an equipment set and the arrangement of the equipment in the equipment set, and then the model, the number and the arrangement of the vibration isolators are determined, so that the equivalent action point of the composite force of the supporting forces of all vibration isolators and the gravity center of a whole body comprising the equipment set and the equipment mounting platform are positioned on the same vertical straight line; and the support force of each vibration isolator is 95 to 105 percent of the rated load of the vibration isolator. A vibration isolation device according to the method for arranging the multiple vibration isolators comprises the equipment mounting platform for mounting the equipment set, a positioning plate connected with a foundation platform and the vibration isolators arranged between the equipment mounting platform and the positioning plate. The method is characterized in that the equivalent action point of the composite force of the supporting forces of all vibrationisolators and the gravity center of the whole body comprising the equipment set and the equipment mounting platform are positioned on the same vertical straight line and the support force of each vibration isolator is 95 to 105 percent of the rated load of the vibration isolator. The number of the vibration isolators is not less than eight and the number of the models of the vibration isolators is one or two.

The invention discloses a small-scale edible fungus planting device and a planting method in the technical field of edible fungus planting. The planting device comprises a box body, wherein a cabinet door is arranged at the bottom of the left side of the box body; a glass plate is arranged at the top of the box body, a transparent thermal insulation coating is arranged on the surface of the glass plate; an electric roller and a hanging seat are arranged on the left side and the right side of the top of the glass plate respectively, a hook is arranged on the bottom of the left side of an edible fungus planting frame and facilitates the edible fungus planting frame to be moved outside the box body manually by workers or by a tractor, so that the working efficiency is increased; horizontal division plates are anti-rust grid plates, so that the plates are prevented from rusting when the humidity is high, and meanwhile light transmission and air circulation are facilitated; meanwhile three sets of cultivation devices are arranged on the left side, the center and the right side of the three sets of horizontal division plates respectively, and the cultivation devices are not on the same vertical straight line, so that the illumination can be fully accepted.

The invention provides a system for calibrating a linear array camera based on a laser scanner, comprising a bearing device, a laser scanner and a resolver, wherein the laser scanner is arranged on the bearing device, and the bearing device is provided with a support which is used for fixing the linear array camera; the laser scanner is arranged below the linear array camera, the scanning direction of the laser scanner is parallel to the lens direction of the linear array camera, and nodes of the laser scanner and nodes of the linear array camera are in the same vertical straight line; the laser scanner scans to acquire point cloud data of a measured target object; the linear array camera takes pictures for positions scanned by the laser scanner so as to acquire image data of the measured target object; and the resolver receives the point cloud data and the image data, carries out characteristic matching on the received data and operates inner orientation elements of the linear array camera in accordance with the received data. The invention also provides a method for calibrating the linear array camera based on the laser scanner. The system and method provided by the invention can be used to reduce the workload of calibrating the linear array camera.

The invention discloses a low-cost and low-profile broadband Massive MIMO antenna unit, comprising a conductor parasitic patch, a conductor coupling sheet, an antenna radiator and a conductor grounding layer which are arranged in turn and at intervals from top to bottom along a vertical straight line, wherein dielectric layers are arranged between adjacent parts. A vertical slot and a horizontal slot are symmetrically arranged at the center position of the conductor coupling sheet, and the vertical slot and the horizontal slot are orthogonal to each other and are used to expand the frequency bandwidth of the antenna. The antenna radiator is provided with a horizontal polarization feed point and a vertical polarization feed point with the feed directions orthogonal to each other. A first isolation slot is arranged at the center position between the horizontal polarization feed point and the vertical polarization feed point. Second isolation slots are arranged on the two sides of the horizontal polarization feed point and on the two sides of the vertical polarization feed point. The first isolation slot and the second isolation slots are used to improve the isolation between the horizontal polarization feed point and the vertical polarization feed point. The low-cost and low-profile broadband Massive MIMO antenna unit has the technical features of wide frequency bandwidth, high degree of isolation, high single-antenna gain, low cost and low profile.

An equipment system for a roadway-free coal-pillar-free self entry-retaining mining construction method is provided. The system mainly comprises a transition support, end supports, ultra-back supports and rapid withdrawing supports. Working plane gate entries during mining are free of tunneling, a regular coal wall can be cut at a mining district end through a coal cutter and is adopted as one laneway's side of the gate entries, the other side is formed through top cutting, and a top plate falls and then automatically form a laneway's side, thus forming the gate entries in a coal extraction. The coal cutter is controlled in a digital manner during end coal cutting, and automatically cuts an end lateral coal wall to form a vertical straight line to be adopted as one side of the gate entries. A scraper machine cooperates with an arc coal catching plate of the coal cutter to clean float coal at the end as far as possible. The transition support, the end supports, the ultra-back supports and the rapid withdrawing supports can provide support and protection during working processes and can move forward along with coal mining equipment.

The invention discloses a visual positioning method in a complex environment, relates to the technical field of robot positioning, and solves the problem of low positioning precision of a robot in thecomplex environment. The method comprises the following steps: carrying out long-distance left-right calibration and short-distance left-right calibration on the position of the robot; for remote left-right calibration, in order to calculate the difference between the current position and the standard position of the robot, matching the image acquired by the camera at the current position with the image of the template at the standard position, and calculating the difference to obtain the position deviation of the robot; for close range left and right calibration, using image preprocessing for reducing the overall noise of a digital image, eliminating useless image feature information influencing the recognition effect and improving the system recognition precision. The purpose of straight line detection is to extract vertical straight line information in a binary image and determine the movement distance of a secondarily calibrated robot according to the distribution condition of straight lines. The positioning precision of the robot is improved.

The invention relates to the technical field of Chinese teaching tools, and discloses a display board for Chinese teaching in primary school convenient for Chinese character blackboard-writing. The display board comprises a base; a display board is arranged above the base; first slide rails are arranged at the top and the bottom of a front panel of the display board in parallel; the first slide rails are slidingly connected with first slide blocks; second slide rails are fixedly connected between the upper and lower first slide blocks, and are slidingly connected with second slide blocks; theleft ends of the second slide blocks are hinged with rotating blocks through spring hinges; the spring hinges provide force towards the display board to the rotating blocks; chalk ports are formed inthe rotating blocks; the rotating blocks are in threaded connection with fastening bolts; and the fastening bolts extend into the chalk ports. Chalks can be fixed through arrangement of the rotating blocks; transverse straight lines can be drawn through left-right movement of the second slide rails; vertical straight lines can be drawn through up-down movement of the second slide blocks; and mattscan be drawn through combination of the transverse and vertical straight lines to achieve convenience and speediness.

The invention discloses a test device and a test method for simulating excavation and unloading under the deep three-dimensional loading condition. The device comprises a true triaxial test bench, a rock test sample, a loading chamber, a connecting column, a left round hole, a right round hole, a front bearing plate, a back bearing plate, a cushion block, a bolt, a pedestal, a rectangular frame, avertical linear guide rail, a vertical sliding block, a horizontal linear guide rail, a horizontal sliding block, a left cross beam, a right cross beam, a screw rod nut, a lifting screw rod, a bearing, a straight rack, a gear, a steering gear vertical output shaft, a motor, a steering gear, a sealing shell, a gas inlet, a steering gear horizontal output shaft, a cutting drill bit, a spiral bladeand a hole channel. The test method is implemented according to the following steps: 1, fixing the device and performing three-dimensional loading; 2, mounting and adjusting the position of the cutting drill bit; 3, simulating round tunnel excavation, unloading and drilling; and 4, developing subsequent research. The adaptability is high and the process of simulating the excavation and unloading process through three-dimensional loading is realized.

A parcel slip, comprising a parcel slip body with a waybill number on the parcel slip body, a scanning area on the front of the parcel slip body, a barcode corresponding to the waybill number, a recipient phone number in the scanning area frame and three positioning marks, the barcode is arranged up and down with the recipient’s phone frame, and the two are aligned left and right, and the width is equal. The three positioning marks are black circular dots or square dots, and are located on the barcode And around the recipient's phone frame, one of the positioning marks and the other two positioning marks are respectively on the same horizontal straight line and the same vertical straight line. The package slip of the present invention can quickly, accurately and conveniently obtain the waybill number and the recipient's phone number through one scan, so that the recipient can be conveniently notified to pick up the parcel during the delivery process, and the express shipments are conveniently sorted and quickly identified , greatly improving the efficiency of sending and receiving express mail, making highly automated express delivery business processes possible, and improving logistics efficiency.

The invention belongs to the technical field of card cutting presses and relates to a card cutting press workblank transferring mechanical arm which comprises a material box, a horizontal straight line guiding track, a horizontally-moving component and a lifting component. An upper opening of the material box is flush with the upper surface of a feeding platform. The horizontally-moving component comprises a horizontally-moving sliding block, a horizontally-moving support and a vertical straight line guiding track. The horizontally-moving sliding block and the horizontal straight line guiding track form a straight line guiding track pair. The horizontally-moving support is fixedly connected with horizontally-moving sliding block. The vertical straight line guiding track is fixedly connected with the horizontally-moving support. The vertical straight line guiding track is in the vertical direction. The lifting component comprises a lifting sliding block, a connecting piece and a sucking disc component. The lifting sliding block and the vertical straight line guiding track form a straight line guiding track pair. The connecting piece is fixedly connected with the lifting sliding block. The sucking disc component is fixedly connected with the connecting piece. The sucking disc component comprises a vacuum pipe and two sucking discs. A pipe cavity is arranged in the middle of the vacuum pipe. The sucking discs are connected with the vacuum pipe. Transferring action is automatically completed by machinery, efficiency is high, working quality is safe and reliable, and manpower is saved.

The invention provides a full-automatic robot laser welding system which consists of an overall fence 1, a laser welding device, a conveying mechanism and a transfer robot 9, wherein the overall fence 1 is arranged outside the laser welding device, the conveying mechanism and the transfer robot 9; the transfer robot 9 is arranged on the laser welding device; the conveying mechanism is arranged outside the laser welding device, and the vertical straight line distance between the furthest transverse end of the conveying mechanism and the laser welding device is shorter than the longest arm length of an unfolded operation arm of the transfer robot on the same laser welding device. By virtue of the full-automatic robot laser welding system, the logistics expenditure is effectively reduced, closed operation is adopted, manual operation steps are reduced, and injuries or occupational diseases brought to working personnel can be effectively avoided; according to the full-automatic robot laser welding system, by virtue of intelligent operation, the overall safety and reliability of the system are improved, the production efficiency is improved, and energy consumption is reduced.

The invention provides a rotary-shaft diameter and end-surface circular runout non-contact detection device, comprising a supporting base which is used for keeping a whole module to be installed and positioned, a clamping module which is used for positioning a to-be-tested rotary shaft, a horizontal linear driving module and a vertical linear driving module which are used for driving a detection module, a sensor detection module which is used for scanning a diameter of the to-be-tested rotary shaft and circular runout of an end surface of the to-be-tested rotary shaft, and a cylinder module that enables left and right ejector pins to tightly clamp and be separated from the to-be-tested rotary shaft. The diameter of the to-be-tested rotary shaft and the circular runout of the end surface ofthe to-be-tested rotary shaft can be detected only by placing the to-be-tested rotary shaft into the clamping module and starting the device. The invention aims at a commonly-used three-coordinate marking detection method in the detection of the diameter of the rotary shaft and the circular runout of the end surface of the rotary shaft, and designs a non-contact laser detection device capable ofobtaining measurement data in time.

The invention relates to the technical field of human body foot type detection, and provides a human body foot type arch detection method. The human body foot type arch detection method comprises the following steps: utilizing a physical digitalizer to acquire discrete point cloud data of a foot to be detected; generating a grid curved surface; enabling the grid curved surface to generate a closed curved surface; establishing a local coordinate system; solving plane intersection points of the closed curved surface and an equation that z minus 5 is equal to 0; performing the first place connection of the obtained intersection points to generate a closed curve; using that x equals to a as a divisional plane, wherein a expresses a real number, and partitioning into two point sets; finding the maximal intersection points (A and B) of coordinate y; marking the midpoint of a connecting line of A and B as E, drawing a straight line perpendicular to the straight line AB, and calculating two intersection points (F and G) of the vertical straight line and the closed curve line; calculating a length ratio r of the line segments EF and FG; comparing the length ratio r with the arch judging standard to determine the arch type. The human body foot type arch detection method disclosed by the invention improves the human body foot type arch detection reliability, and is high in accuracy, zero in misdiagnosis rate and high in efficiency.

The invention relates to a heating method of ethyl benzene of an ethyl benzene dehydrogenation reaction material, which mainly solves the problems of frequent accidents of the combined heat exchanger, difficult long-period and stable running, large pressure drop in the pipeline of a reactive system and inadequate heat recovery of a reactor charging / discharging three-level combined heat exchanger in the traditional styrene device due to the unreasonable flow for heating the ethyl benzene by utilizing the discharging of the high temperature reactor. The invention adopts the technical proposals that a liquid phase ethyl benzene material and ingredient water vapor are firstly vaporized to a gas phase with a temperature of between 90 and 110 DEG C through an independently arranged evaporator, and then enter the third level shell pass of the reactor charging / discharging combined heat exchanger to be preheated to a temperature of between 200 and 250 DEG C and then enter the first level shell pass of the reactor charging / discharging combined heat exchanger for being super-heated to a temperature of between 450 and 550 DEG C by the discharging of the high temperature reactor, and the second level shell pass of the reactor charging / discharging combined heat exchanger is used for generating saturated water vapor with a pressure of between 400KPaA and 1000KPaA; and the reactor charging / discharging three-level combined heat exchanger adopts the horizontal or vertical straight-line type arrangement mode, a linear type pipeline expansion joint is disposed between an exit of a dehydrogenation reactor and a material inlet of the first level in the reactor charging super-heater, namely the three-level combined heat exchanger to maintain the shortest distance for allowing installation between the dehydrogenation reactor and the charging super-heater, thereby reducing the tube shell pass thermal expansion difference of the first level heat exchanger.

The invention discloses a tile flatness detecting method and device. The device is characterized by comprising an upper linear guide rail and a lower linear guide rail which are horizontally arranged on the two sides of a tile conveying device, a vertical straight line guide rail perpendicular to the tile conveying direction, an inclined straight line guide rail corresponding to the tile diagonal direction, and laser displacement sensors which are arranged on the straight line guide rails in a sliding mode respectively, the detection direction of the laser displacement sensors faces downwards, and the laser displacement sensors on the straight line guide rails are driven by an electric power mechanism to move. Compared with the prior art, the tile flatness detecting method and device have the advantages that calibration is not needed and tile deformation detection omission is not prone to occurrence.

The invention discloses a displacement analysis method for determining the slope critical sliding surface, and relates to the technical field of slope stability analysis. The method comprises the following steps of selecting a slope body to be tested, and performing modeling; enabling the slope to be in a critical state by using a strength reduction method; determining a discrete point distribution region; installing a plurality of vertical straight lines in the discrete point distribution region, wherein a plurality of discrete points are distributed on each vertical straight line from head to tail, and a plurality of discrete points are also distributed in a straight line of the upper boundary of the discrete point distribution region; calculating the displacement change rate of the midpoint of a connecting line of any two adjacent discrete points on each straight line of the boundary and on the vertical lines; respectively finding out the position of the maximum displacement change rate on the straight line of the boundary and on the vertical lines; and performing smoothening processing on a connecting line of the position of the sliding surface and the position of an inlet and outlet opening of the sliding surface. The method has the advantages that the requirements of high accuracy of the judged sliding surface, wide application range, precise theory and simple method are ensured; the artificial and experiential defects are avoided; and great engineering practice significance is realized.

The invention provides a sample platform, a microscopic observation device and a sample platform adjusting method. The sample platform comprises a rotating motor (3), a rotating motor and horizontal linear motor connecting module (4), a horizontal linear motor (5), a horizontal linear motor sliding block (6), a horizontal linear motor and vertical linear motor connecting module (7), a vertical linear motor (8), a vertical linear motor sliding block (9) and an object stage (12) which are sequentially connected along the Z-axis direction. The sample platform not only can change the spatial position of a sample, but also can be used by being matched with microscopic imaging instruments such as a scanning electron microscope SEM, an optical microscope OM, an atomic force microscope AFM so as to perform an in-situ rotating operation and observation on a tested piece. The sample platform and the microscopic observation device are simple in structure, can perform testing on various sizes of samples, and are high in adaptability, compact in space structure and convenient to observe.

The invention relates to a broadband low-consumption junior unit left-handed material based on double crosses. The broadband low-consumption junior unit left-handed material comprises two cross-shaped metal wire structures, and is formed by arranging the two cross-shaped metal wire structures on the same side of a dielectric substrate in a mirroring paralleling mode. Each cross-shaped metal wire structure is composed of a short transverse straight line and a long vertical straight line, wherein the length a of the short transverse straight line of the cross-shaped metal wire structure ranges from 1.0 mm to 5.0 mm, the length b of the long vertical straight line ranges from 2.0 mm to 6.0 mm, and the line width of the long vertical straight line ranges from 0.1 mm to 0.25 m. The transverse distance g of the long vertical straight lines of a double cross-shaped metal wire structure unit array ranges from 0.1 mm to 0.25 mm, and the longitudinal distance k between the short transverse straight lines ranges from 2.5 mm to 6.0 mm. The broadband low-consumption junior unit left-handed material is easy to machine; through the high coupling performance of the two cross-shaped structures, the bandwidth can reach to more than fifty percent under the condition that the transmission loss is very small, and the unit electrical length is very low, and the application range of the left-handed material is expanded.

The invention provides a camera radial distortion correction parameter calibration method, device and system. The method is based on a design drawing card comprising a first straight line segment anda second straight line segment, and comprises the steps of firstly obtaining a shot image of a design drawing card shot by a to-be-calibrated camera, and then obtaining a first intersection point group of a preset horizontal straight line and the same curve segment in the shot image line by line; and obtaining a second intersection point group of the preset vertical straight line and the same curve segment in the shot image column by column; and forming at least one first target line segment and a second target line segment based on the first intersection point group and the second intersection point group; and determining a distortion center based on the intersection point of the perpendicular bisector of the first target line segment and the perpendicular bisector of the second target line segment. According to the scheme, the distortion center can be determined, the number of unknown parameters in the model is reduced to three, at the moment, a linear equation set is solved throughthe least square method, so that the convergence is easy, the calculated amount of camera radial distortion correction parameters is reduced, and the calculation time is shortened.

The main transmission and conversion mechanism for automatic die cutting and thermoprinting machine includes pedestal, movable platform, four upper shaft seats connected to the movable platform and four toggle rod upper shafts, and features that between the four toggle rod upper shafts and the pedestal one combination of four conjugated cams and one lower toggle rod transmission mechanism are installed. The present invention has smart design of converting the rotation of conjugated cams into vertical straight line motion to make the platform obtain sufficient staying time in the highest point and the lowest point and fast ascent and descent speed and to meet the special technological requirement for pressing and gold stamping. The present invention has simple and compact structure, high processing quality, high production efficiency and wide application foreground.