122 results about "Angular degrees" patented technology

Endoscope has vertical bending operation wires transmitting a pulling force to a bending portion of an insertion portion, a vertical bending pulley having pulley grooves on an outer circumference, and wire guides in a partial region in a circumference direction of each pulley groove and guiding the vertical bending operation wires to be wound in the respective pulley grooves. The pulleys rotate within a 180-degree angular range, and a width of a bottom portion of each pulley groove allows each wire to be wound for at most two revolutions. The width of the bottom portion of the pulley groove is narrowed down with each wire guide so that each wire is wound only one revolution in a rotation axis direction of each pulley, and a tapered shape of each wire guide guides the wire to be wound in the partial region to the bottom portion of each pulley groove.

The invention discloses a multi-degree-of-freedom rotation error obtaining method and device, a medium and equipment, and relates to the technical field of precision measurement, and the method comprises the steps: installing a double-ball target on the end face of a rotary table, and obtaining a plurality of different rotation angle images when the double-ball target rotates along with the rotary table; detecting the plurality of images with different rotation angles, determining the three-dimensional coordinates of the sphere center positions of the plurality of double-sphere targets, averaging the three-dimensional coordinates of the sphere center positions of the plurality of double-sphere targets, and generating the motion trails of the sphere centers of the double-sphere targets; fitting the motion trail of the center of the double-ball target by adopting a least square circle method to obtain two base circle center coordinates of the motion trail on a two-dimensional plane, and obtaining a multi-degree-of-freedom rotation error of the rotary table according to the two base circle center coordinates; wherein the multi-degree-of-freedom rotation error comprises an axial rotation error, a radial rotation error and an inclined rotation error, and efficient measurement of the multi-degree-of-freedom rotation error is achieved.

The invention relates to a manufacturing method of a microprism reflective film die integrating two triangular pyramids and a reflective film, and the manufacturing method of the die comprises the following steps: 1, respectively rotating a die base material on a B-axis rotary table to 0 degree, 120 degrees and 60 degrees, and machining a first tool to a third tool by using a first tool with a tool angle alpha mounted on a fly-cutter disc; the mold base material is rotated to be located at the 0-degree position, the 120-degree position and the 60-degree position, machining of the fourth tool, the fifth tool, the sixth tool and the sixth tool is conducted, in the machining of the fourth tool, the fifth tool, the sixth tool and the sixth tool, the first tool is used for machining, the second tool is used for machining, the first tool and the second tool are symmetrical tools, and the inclination angles of the two sides are the same. While better performance indexes under different application conditions are obtained, the influence of large conical surface angle deflection angle processing or asymmetric design on optimization and balance of the retroreflection performance of 0 / 90 / 180-degree orientation of the reflective film can be reduced.

The present invention relates to the field of tire manufacturing technology, and more particularly to a tire forming method, apparatus, and computer program product for optimizing the rounded reciprocating (RRO) out-of-roundness (RRO) of a green tire. The method comprises the following steps: 1) setting multiple apex positioning angles between 0 and 360 degrees in the forming machine product parameter column; 2) conducting a building drum and steel apex combination test at each angle, measuring the RRO out-of-roundness of 15 to 30 green tires, and taking the average value; 3) comparing the data to determine the minimum RRO out-of-roundness when the positioning angle is angle A; and 4) rotating the building drum by angle A, then combining the building drum with the steel apex. The present invention uses online RRO out-of-roundness data to adjust the angle between the building drum and the steel apex, effectively preventing the overlap of the high points of the building drum and the steel apex, thereby improving the overall quality of the tire.

A motion system with a controllable rotation range comprises a base (P), a first component (10), a second component (20) and a third component (30), the first component (10) can rotate around a first rotation shaft (R1) relative to the base (P), the second component (20) can rotate around a second rotation shaft (R2) relative to the first component (10), the third component (30) can rotate around a third rotation shaft (R3) relative to the second component (20), the included angle between the first rotation shaft (R1) and the second rotation shaft (R2) is a1, and a2 is an angle between the first rotation shaft (R1) and the second rotation shaft (R2). The included angle between the second rotating shaft (R2) and the third rotating shaft (R3) is a2, 0 degree < a1 < 90 degrees, 0 degree < a2 < 90 degrees, the third component (30) comprises a first collision area, the base (P) comprises a second collision area, the first collision area can interfere with the second collision area, and the conical angle of a conical area covered by the third rotating shaft (R3) in the moving process is made to be smaller than 4 * a1 and 4 * a2. And the rotating range can be set as required.

Ring wrench structure, comprehensive a main body (10) forming a first receiving section (11) at one end, the main body (10) having a handle section (12) connected to the first receiving section (11), wherein a receiving recess (13) is formed inside the first receiving section (11), the receiving recess being annular and having twelve teeth, the receiving recess (13) forming a first corner (14) being one of the corners between the teeth of the receiving recess (13), and wherein a second receiving section (15) is provided at the other end of the handle section (12). characterized by the fact that Viewed in two dimensions, a first circle center (21) is defined in the center of the receiving recess (13), through which a first line (22) runs, which can also serve as a horizontal line, wherein a second line (23) also runs through the first circle center (21), connecting the first circle center (21) with the first corner (14), wherein a first angle (24) is formed between the second line (23) and the first line (22), wherein a third line (25) is defined at the handle section (12), which runs parallel to the first line (22) and extends in the same direction as the handle section (12), wherein the third line (25) is the center line of the handle section (12), that is, starting from the third line (25) two fourth lines (26) are defined, which run perpendicular to the third line (25) and are symmetrical to the third line (25),where a first distance (27) is defined between the third line (25) and the first line (22); , wherein the value of the first angle (24) is less than 30 degrees and greater than 0 degrees, or the value of the first angle (24) is less than 20 degrees and greater than 2.5 degrees, or the value of the first angle (24) is less than 15 degrees and greater than 5 degrees, or the value of the first angle (24) is 5 degrees, 7.5 degrees, 10 degrees, 12.5 degrees or 15 degrees, wherein the value of the first distance (27) is less than 8 mm and greater than 1 mm, or the value of the first distance (27) is less than 6 mm and greater than 2 mm, or the value of the first distance (27) is less than 5 mm and greater than 3 mm, or the value of the first distance (27) is 4 mm;wherein, when the first receiving section (11) is attached to a screw element (30) for rotation, this screw element (30) has a second circle center (31), wherein this second circle center (31) substantially coincides with the first circle center (21), wherein a fifth line (32) runs horizontally through the second circle center (31), wherein the screw element (30) has a second corner (34) which is one of the corners of the screw element (30), wherein a connecting line (33) is defined between the second circle center (31) and the second corner (34), wherein in the first state the second corner (34) and the second circle center (31) are on the same horizontal line, wherein the connecting line (33) and the fifth line (32) coincide; ; wherein a first obstacle (41) and a second obstacle (42) are present, wherein if the second receiving section (15) can only pivot within the narrow space between the first obstacle (41) and the second obstacle (42), then this narrow space between the first obstacle (41) and the second obstacle (42) corresponds to the spatial state during the working process within a limited pivoting space of the main body (10); in the first state the second receiving section (15) is located near the first obstacle (41) after the first receiving section (11) has been attached to the screw element (30), wherein a horizontal line (50) passes through the first circle center (21), the horizontal line (50) coinciding with the fifth line (32), and a first swivel angle (51) being defined between the horizontal line (50) and the first line (22);wherein the screw element (30) is rotated by pivoting the main body (10), wherein, when the screw element (30) has been rotated about the second circle center point (31) into the second state, there is no further pivot space between the second receiving section (15) and the second obstacle (42), i.e., that the main body (10) cannot rotate the screw element (30) any further, wherein a second pivot angle (52) is defined between the horizontal line (50) and the first line (22), wherein the main body (10) is pivoted about the second circle center point (31) by the first pivot angle (51) and the second pivot angle (52), wherein a first rotation angle (35) is defined between the connecting line (33) and the fifth line (32), wherein the value of the first rotation angle (35) corresponds to the sum of the values ​​of the first pivot angle (51) and the second pivot angle (52); ; wherein, when the screw element (30) cannot be rotated further, the main body (10) is turned, wherein a third pivot angle (53) is defined between the first line (22) and the horizontal line (50), and the first rotation angle (35) is defined between the fifth line (32) and the connecting line (33), which represents the third state, wherein a fourth pivot angle (54) is defined between the horizontal line (50) and the first line (22), wherein the angle between the fifth line (32) and the connecting line (33) increases from the original first rotation angle (35) by a second rotation angle (36), wherein the second rotation angle (36) corresponds to the sum of the third pivot angle (53) and the fourth pivot angle (54), wherein, when the main body (10) is moved between the first obstacle (41) and the second obstacle (42) after turning, the handle section (12) has a pivot space,which corresponds to the sum of the third swivel angle (53) and the fourth swivel angle (54); and , wherein from the first state to the fourth state the screw element (30) is already rotated by a swivel range which corresponds to the sum of the first rotation angle (35) and the second rotation angle (36), wherein the sum of the values ​​of the first rotation angle (35) and the second rotation angle (36) is greater than 30 degrees, and wherein the first receiving section (11) can be turned again to continuously rotate the screw element (30).

The invention relates to the technical field of nondestructive testing, and particularly discloses an auxiliary device for double-curvature honeycomb sandwich composite material penetration method ultrasonic testing, which comprises a plurality of wheels, a supporting assembly arranged at the upper parts of the plurality of wheels and used for clamping parts, and an inclination angle adjusting assembly arranged at the upper part of the supporting assembly and used for adjusting the inclination angle of the supporting assembly. The inclination angle adjusting assembly is arranged on the side, close to the wheels, of the supporting assembly and used for adjusting the placing angle of the supporting assembly. By arranging the supporting assembly, a part can be clamped and supported through the supporting assembly, then the whole supporting assembly and the part are driven to rotate in the horizontal plane through the rotating assembly, different circumferential areas of the part can be sequentially aligned with an ultrasonic probe, repeated disassembly and reassembly are not needed, 360-degree continuous and indexing rotating detection is achieved, and the detection efficiency is improved. And by arranging the inclination angle adjusting assembly, the pitch angle of the supporting assembly can be adjusted through the inclination angle adjusting assembly.

The utility model discloses a 360-degree rotary scanning device for a triangular area of a steel rail welding seam, which relates to the technical field of rail performance testing and comprises a base I, a handle, a base II, an adjusting rod, a connecting rod, a belt pulley transmission mechanism and a rotary probe, the second base is connected to the top of the base through the connecting rod, the adjusting rod is rotationally connected with the first base, the rotating probe is rotationally connected with the second base, one end of the adjusting rod is connected with the rotating probe through the belt wheel transmission mechanism, and the other end of the adjusting rod is connected with the rotating probe through the belt wheel transmission mechanism. The adjusting rod is rotated to drive the rotary probe to rotate through the transmission of the belt pulley transmission mechanism; the position and the angle of the rotary probe can be adjusted by 360 degrees through the moving device and the rotary adjusting rod. The angle and the position of the rotary probe can be freely adjusted within the range of 360 degrees so as to meet the detection requirements of different welding seam triangular areas, all-directional rotary scanning is achieved, and the detection precision and reliability are improved.

The embodiment of the application discloses a cam profile curve modeling method. The cam profile curve modeling method comprises the following steps: drawing a base circle with a radius of r1; drawing a law curve, wherein the law curve of the X-axis and the Y-axis is set according to the following formula, and the law curve of the Z-axis is constant and 0; setting the center B of the base circle as the origin of the coordinate system; xt=R*cos(360*t), yt=R*sin(360*t); wherein t is a set increment variable, and the value range is 0 to 1; R is a line segment from the center B of the base circle, and 360*t is the angle through which the line segment R rotates counterclockwise around the center of the base circle; changing the length of the line segment R and obtaining N-stage profile curves after rotating the line segment R counterclockwise around the center of the base circle; and connecting the N-stage profile curves to obtain a cam profile curve; wherein N is a positive integer. The technical scheme of the application can avoid a large number of point data and draw an accurate and ideal cam profile curve.

The invention discloses an aircraft bearing large-convexity tapered roller angle detection method, and relates to the technical field of bearing detection. The objective of the invention is to solve the problem that when the angle of a large-convexity tapered roller is detected in the prior art, the angle can be determined by using a D744 axis instrument to detect the size variation through a fixed distance, and the measurement error is large due to the convexity influence of the tapered roller. Size detection is carried out on the large-convexity tapered rollers at different point positions in sequence through the three D051 axis instruments, and a deviation value is measured through comparison with a standard part; respectively subtracting the midpoint size variation from the variation of the maximum size and the minimum size measured in the step 1 to obtain the actual deviation value of the comparison theoretical calculation standard value from the large end face to the small end face; finally, whether the angle is qualified or not is judged through the deviation value of the two points. The method is suitable for accurately measuring the angle of the large-convexity tapered roller.

A method for determining the angular position of a shaft of a motor vehicle. The method includes calculating the mean angular resolution; calculating the time at which the cosine signal passes through zero; using the time at which the sine signal passes through zero and the mean angular resolution; determining the measured angle at the calculated time at which the cosine signal passes through zero; calculating the amplitude of the second harmonic of the measured angle signa;, calculating a second-harmonic error from the calculated amplitude of the second harmonic; and calculating a compensated angle representing the corrected angular position of the shaft from the real-time measured angle and from the calculated second-harmonic error.

Rotating structure (4) for civil applications, comprising - a fixed part (8) and a movable part (12) which rotates about an axis of rotation (XX) and is equipped with drive means (16) for its rotation about the axis of rotation (XX), - wherein the fixed part (8) and the movable part (12) are coaxial with respect to the axis of rotation (XX), - wherein the drive means (16) are arranged on an outer diameter of the movable part (12) antipodal to the axis of rotation (XX), - wherein the fixed part (8) and the movable part (12) are connected to each other at an inner circular interface (20), corresponding to an inner diameter on the side of the axis of rotation (XX), and at an outer circular interface (24), corresponding to an outer diameter, opposite the inner diameter along a radial direction (RR) perpendicular to and intersecting the axis of rotation (XX), - wherein the rotating structure (4) comprises a first position band (28) with indices and at least one first position encoder (32) configured for optical reading of the first position band (28) in order to provide a measurement of the angular position of the moving part (12), or encoder - wherein the rotating structure (4) comprises a first velocity band (36) with indices and at least one first velocity encoder (40) configured for optical reading of the first velocity band (36) in order to provide a measurement of the angular velocity of the moving part (12), - wherein the first position band (28) and the first position transmitter (32) are arranged according to the inner circular interface (20), - wherein the first speed band (36) and the first speed sensor (40) are arranged according to the outer circular interface (24), - wherein the first speed sensor (40) and the first position sensor (32) are functionally connected to the drive means (16) to enable feedback control of the drive of the drive means (16).

The invention relates to the technical field of precision measurement and angle verification, and discloses an angle verification platform, which comprises a main body and two end plates, and is characterized in that the upper surface of the main body is a plane for placing an instrument to be verified; the two end plates are oppositely arranged on the two transverse sides of the main body in parallel and are detachably connected with the main body; each end plate is provided with scales used for marking the position of the end of the main body. When the two transverse ends of the main body are at the same height, the upper surface of the main body is in a horizontal state, namely the inclination angle is zero; when the two transverse ends of the main body are at different heights, the upper surface of the main body is in an inclined state; at the moment, the difference H of the identification values of the two ends of the main body on the scales of the end plates is read, and under the condition that the length L of the main body and the thickness D of the end plates are known, the inclination angle theta of the upper surface of the main body can be calculated through a trigonometric function such as tan theta = H / (L + D). The angle measuring device is simple in structure, convenient to operate and capable of generating stable and accurate known angle values.

The invention discloses a flying saucer type 360-degree omnidirectional driving device which comprises a main shaft (1), a bearing (2), a support seat (3) and a power propelling assembly (7). The power propulsion assembly (7) blows air downwards to generate lift force, can tilt outwards to form a state B by taking a vertical state A as a reference, and further tilts leftwards and rightwards on the basis of the state B to form a superposition state of D, E, G, H and B, and the adjustment angles are respectively 5-30 degrees outwards and 5-50 degrees leftwards and rightwards. The device can be provided with one to two groups of driving units, each group comprises 2-6 sets of power propelling assemblies, and lifting force is converted into horizontal component force through inclined arrangement, so that 360-degree translation and steering around a main shaft are realized; when two groups of driving units are adopted, the two groups of driving units rotate oppositely to counteract torsion, so that the spindle and an external structure are prevented from spinning. The omni-directional vector driving device is simple in structure, flexible to adjust, capable of achieving omni-directional vector driving, suitable for the flying saucer type aircraft and high in maneuverability and flight stability.

The invention relates to a scroll compressor molded line meshing point capturing and volume solving method. The method comprises the following steps that S1, initial parameters of a scroll compressor are obtained; s2, the initial parameters are substituted into a static disc molded line equation of the scroll compressor for calculation, and a static disc molded line of the scroll compressor is obtained; s3, the rotating angle of the movable disc is set to be 0; s4, whether the rotating angle of the movable disc is not larger than 360 degrees or not is judged, and if yes, S5 is executed; if not, ending; s5, static disc and movable disc discrete points of the multiple sets of scroll compressors are obtained; s6, calculating the distance between the movable disc and the static disc according to the discrete points; s7, the meshing point of the movable disc and the static disc is obtained; s8, extracting all discrete points between two adjacent meshing points and generating a closed surface; s9, calculating the area of the closed surface and calculating the volume of each cavity of the scroll compressor; s10, generating a dynamic graph and outputting the volume value of each cavity; and S11, rotating a movable disc of the scroll compressor by a set angle, and executing the step S4. According to the method, the relatively tedious calculation amount in the actual calculation process is reduced, and the calculation error is reduced.

According to the centroid measuring device and method for the control column assembly, the electronic equipment and the storage medium, through the fixing assemblies arranged at the first position point, the second position point and the third position point of the connecting part, the centroid of the target control column assembly can be measured after the connecting part is connected with the target control column assembly; when the first position point, the second position point and the third position point naturally droop, the first angle, the second angle and the third angle between the datum plane and the vertical plane are obtained by rotating the first position point by 90 degrees and 180 degrees respectively, and therefore the first angle, the second angle and the third angle are obtained by rotating the second position point by 90 degrees and the third position point by 180 degrees respectively. The position information of the mass center of the target control column assembly can be accurately determined through the first angle, the second angle and the third angle, the target control column assembly is connected with the rotating component through the connecting component, an irregular control column can be measured through a traditional mechanical gravity method, a large number of sensors are not needed, operation is convenient, and the measurement precision is high. And the accuracy and efficiency of mass center measurement of the steering column assembly are improved.

The application provides a motor and a dynamic balance adjusting structure of an impeller and a fan, which comprises a motor with an angular scale and a rotating shaft with an angular scale, the 0-degree position of the motor is aligned with the 0-degree position of the rotating shaft, and the motor end of the motor and the rotating shaft is fixedly connected. The rotating shaft is provided with an angular adjusting fixing part with an angular scale at the impeller end, the 0-degree position of the angular adjusting fixing part is aligned with the 0-degree position of the rotating shaft. The rotating shaft is further provided with an impeller with an angular scale at the impeller end, and the hub of the impeller is clamped with the angular adjusting fixing part. The eccentric angle of the motor and the rotating shaft is installed at an angle of 180 degrees with the eccentric angle of the impeller. The rotating shaft is further provided with a limiting part for limiting the axial displacement of the impeller. The dynamic balance adjusting structure can greatly reduce the vibration of the motor, the rotating shaft and the impeller caused by the dynamic balance error during rotation, and reduce the dynamic balance test in the production and manufacturing process, and improve the production efficiency.

The application relates to an auxiliary drawing instrument for a three-dimensional size map, which comprises an angle measuring system, a connecting part and a distance measuring system, wherein the angle measuring system comprises a horizontal angle measuring system and a vertical angle measuring system; the horizontal angle measuring system is horizontally arranged and can measure a horizontal rotation angle; the vertical angle measuring system is vertically arranged above the horizontal angle measuring system through the connecting part and can measure a vertical rotation angle; and the distance measuring system is horizontally arranged outside the vertical angle measuring system; the coordinates of a point in a three-dimensional space are calculated through the values of the horizontal angle measuring system and the vertical angle measuring system and the distance measured by the distance measuring system; the specific shape of a certain three-dimensional space can be known according to the continuously measured point information; the measuring precision is greatly improved; the measuring time is shortened; the device is simple to use; the measuring efficiency is effectively ensured; labor and labor cost are greatly saved; and the device is extremely practical.

The present invention discloses a three-degree-of-freedom simulation air flotation test system and a method for positioning a motion platform thereof. The system includes a base, a motion platform, a distance measurement unit, an angle measurement unit and a calculation unit. A coordinate system is set with the center point of the upper surface of the base as the coordinate origin. The motion platform is installed on the base, the power is turned on, the system is initialized, two position points are selected at the edge of the base, wherein the center point of the motion platform is perpendicular to the line between the two selected position points, the distance measurement unit obtains the first distance and the second distance between the center point of the motion platform and the first position point and the second position point on the edge of the base respectively, the angle measurement unit obtains the angle between the line between the center point of the motion platform and the first position point on the edge of the base and the geomagnetic direction N, and the calculation unit calculates the position coordinates of the center point of the motion platform in the plane rectangular coordinate system according to the first distance, the second distance and the angle. The method and system are simple to set up and can accurately position the motion platform.

The present invention relates to a rotation angle detection device (1), comprising: a correction target driven gear (32), which is a driven gear meshing with a main drive gear (31); a first sensor (37) configured to generate an electrical signal based on the rotation of the correction target driven gear (32); and an electronic control unit (100) that calculates the driven-side rotation angle based on the electrical signal. The electronic control unit (100) is configured to store a correction angle, which is used to correct the driven-side rotation angle when calculating the driven-side rotation angle. The correction is a predetermined deviation in a predetermined angle range, which is an average value obtained by averaging deviations of an integer quantity corresponding to the same relative rotation angle, thereby serving as a deviation in the angle range of 0 degrees to 360 degrees.

The utility model relates to the technical field of grinding machine parts, in particular to a quick chamfering device for a grinding machine and grinding machine equipment, the quick chamfering device for the grinding machine comprises a supporting seat, a shielding frame and an angle measurer, the supporting seat is provided with a first inclined plane, and the angle between the first inclined plane and the horizontal plane is 45 degrees; the shielding frame is rotationally installed on the supporting base, a second inclined face is arranged on the shielding frame, and a long-strip-shaped through hole allowing a workpiece to be machined to penetrate through is formed between the first inclined face and the second inclined face. The angle measurer is installed on the supporting seat and used for measuring the angle between the second inclined plane and the horizontal plane. According to the fast chamfering device for the grinding machine, chamfers of different degrees can be machined on a workpiece to be machined through the fast chamfering device for the grinding machine, the applicability and universality of the fast chamfering device for the grinding machine are improved, and the chamfers machined through the fast chamfering device for the grinding machine have the advantages of being high in precision, easy to operate, high in efficiency and the like.

The application discloses a kind of redundant drive six degrees of freedom parallel mechanism of dynamic platform continuous 360 degree rotation, including static platform, the slider car group of sliding is arranged in the static platform, the slider car in the slider car group is connected with dynamic platform by support chain, and the dynamic platform is circular.The static platform in the application is composed of two roller coaster track type ring tracks orthogonally, and the slider car can rotate along the ring track of static platform, and the motion cooperation of four linear drive support chains and four slider cars can realize the continuous roll and pitch angle 0-360 degrees of dynamic platform, increase the attitude workspace of mechanism, so as to meet the requirements of fighter aircraft maneuverability simulation.The application controls six degrees of freedom of mechanism by four support chains, reduces the number of support chains, and the structure is simple, and the mechanism adopts redundant drive, one support chain is redundant drive support chain, and the motion characteristics are not affected after removing the support chain, and the redundant drive support chain can improve the carrying capacity of mechanism.

The features of this protractor are as follows (1) and (2): (1) In the front view, the outer periphery of the full circle is marked clockwise with an angle scale ranging from 0° to 360°, and in order to make the 1° markings easier to see and measure, the 5° markings are made longer than the other marks every 10°, and a stepped scale is formed with the 1° markings being the shortest and the 2° markings and subsequent marks successively longer until the 10° markings are the longest. Of the stepped scales, the 2° markings, 4° markings, 6° markings, and 8° markings at each of the 10° markings are filled in with circles larger than the width of the markings to form easy-to-see circular scales. In addition, the numbers "0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350" are displayed for each 10° scale unit, with a light red band behind them to make the numbers easier to read. Furthermore, the top of each half (5°) of each 10° scale unit is filled in with a red inverted triangle to form easily identifiable inverted triangular scale marks. (2) In the rear view, the outer periphery of the full circle is marked counterclockwise with an angle scale ranging from 0° to 360°. To make the 1° markings easier to see and measure, the 5° markings are made longer than the other markings, and a stepped scale is formed in succession, with the 1° markings being the shortest and the 2° markings and subsequent marks successively longer until the 10° markings are the longest. Of the stepped scales, the 2° markings, 4° markings, 6° markings, and 8° markings in each of the 10° markings are filled in with a circle at the top, larger than the width of each marking, to form easy-to-see circular scales. In addition, the numbers "0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350" are displayed for each 10° scale unit, and a light blue band is displayed behind them to make the numbers easier to read.In addition, the top of each half (5°) scale marking for each 10° scale unit is filled in red to form an inverted triangle-shaped scale marking that is easy to identify.

The invention relates to the technical field of tunnel engineering, and discloses a two-dimensional plane conversion method of tunnel three-dimensional point cloud data based on angle partition, which comprises the following steps: acquiring different types of tunnel sections and three-dimensional point cloud data of the tunnel sections; based on the three-dimensional point cloud data of the tunnel section, a three-dimensional space model of the tunnel section is established, the number of circle centers of the tunnel section is obtained, the whole tunnel section is divided into a plurality of angle areas in a 360-degree range, and each angle area comprises one circle center and an arc corresponding to the circle center; aiming at each angle region, taking each circle center as a coordinate origin, calculating an orthographic projection included angle of each point by taking any point on an arc corresponding to each circle center, and projecting three-dimensional point cloud data of the tunnel section to a two-dimensional plane by taking a vertex of a vault as a reference in combination with a geometrical relationship of orthographic projection to generate a two-dimensional image of the tunnel section; according to the method, the precision of conversion from the three-dimensional point cloud to the two-dimensional plane is improved, and the practical adaptability to complex engineering is enhanced.

A flow profile with: an airfoil section (40; 80) having an airfoil surface (45, 46; 85, 86) extending along a spanwise direction between a leading edge (41; 81) and a trailing edge (42; 82), and at least one connecting hole (50, 51) extending at least in the airfoil section and having a first opening end (52, 53) open to the airfoil surface, through which the first opening end is connected to a second opening end (54, 55) provided in a cover ring (94, 96) to which the airfoil is connected or in a device on which the airfoil is installed, wherein, at a cross section (S1) perpendicular to the spanwise direction through a position of the first opening end of the spanwise direction, an angle A1 satisfying a condition (a) lies in an angular range equal to or greater than minus 10 degrees and equal to or less than 10 degrees with respect to an extension line obtained by extending a camber line (CL) of the airfoil section from the leading edge while selecting the leading edge as a center, and wherein the condition (a) is a condition that a static pressure at a position of the first opening end is equal to a static pressure at a position of the second opening end when the airfoil section receives a fluid flow from a direction of the angle A1 to the leading edge.

The present application is suitable for the field of numerical control machine tool rotating shaft error term measurement, and particularly relates to a kind of numerical control machine tool rotating shaft geometric error measurement and identification method.Actual rotating shaft line is fitted out by target ball in different positions of rotating shaft axis line respectively by revolving a circle;Then, the target ball is installed at the position deviating from the center of the rotating shaft, and the theoretical circumference diameter is identified by rotating 180 degrees;Finally, the rotating shaft rotates 360 degrees, and the theoretical circumference and the actual circumference of the rotating shaft in space movement are fitted, and then the error term is identified through the difference between the actual circle and the theoretical circle.Compared with the prior art, the present application solves the problem that the angle positioning error cannot be identified by the laser tracker in the prior art, realizes the identification of all geometric errors of the machine tool rotating shaft based on the laser tracker, and can be used for error compensation of the machine tool.