Device for rapidly and accurately detecting precision of spiral bevel gear at original station on machine

Abstract

The utility model relates to a device for quickly and accurately detecting the precision of a spiral bevel gear on an original station, which is characterized by comprising a machine tool turntable, a workpiece supporting disc is arranged at the upper end of the machine tool turntable, and the upper end surface of the workpiece supporting disc is a workpiece mounting surface; comprising a linear motion combination unit which comprises an A-direction linear motion mechanism and a B-direction linear motion mechanism; the power output end of the A-direction linear motion mechanism is fixedly connected with the laser distance sensor, and the outer side part of the other end of the A-direction linear motion mechanism is fixedly connected with the power output end of the B-direction linear motion mechanism; comprising a lower cross arm, an upper vertical arm and a rotating mechanism which moves around a shaft I and a shaft II; the inner end of the lower cross arm is fixedly connected with one side of the machine tool turntable, and the outer end is connected with the lower end of the upper vertical arm through a rotating mechanism moving around a shaft I; the upper end of the upper vertical arm is connected with a B-direction linear motion mechanism through a rotating mechanism which moves around a shaft II; the three rotation angle detection structures are installed at the upper end of the rotating mechanism moving around the shaft I and the shaft II and the upper end of the machine tool rotary table respectively. The device ensures the rapid and accurate measurement of the workpiece.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and particularly relates to a precision detection device for quickly and accurately detecting spiral bevel gears at the original in-machine station. Background Art

[0002] Currently, the detection of spiral bevel gears mainly relies on the coordinate measurement method and the in-machine measurement method. For the coordinate measurement method, the gear needs to be moved from the processing machine tool to the detection center, and the change of the positioning reference during this process is likely to cause detection errors; while the existing in-machine measurement method is directly carried out on the machine tool, but the contact probe used to detect the tooth surface data has a slow speed, which affects the processing rhythm.

[0003] The main existing methods for detecting the precision of spiral bevel gears are as follows:

[0004] 1. Coordinate measurement method: Use a high-precision coordinate measuring machine (such as a three-coordinate measuring machine) to accurately measure the geometric parameters of the spiral bevel gear, such as tooth profile, tooth direction, tooth pitch, etc. By comparing the actual measurement data with the theoretical design data, the precision of the gear is evaluated. However, this measurement method cannot improve the processing process, nor can it improve the processing precision, and it requires a long working time; and during the process of transferring the workpiece from the machine tool to the detector, there are slight changes in the detection positioning reference, and there is a certain error between the detection value and the true value. Most of the distribution of the three-coordinate measurement points adopts a uniform distribution, which may not fully reflect the true geometric shape of the tooth surface.

[0005] 2. Single geometric error measurement method description: Measure a specific geometric error (such as tooth pitch error, tooth profile error, etc.) of the spiral bevel gear separately. Use special measuring instruments or tools, such as a tooth pitch gauge, a tooth profile gauge, etc. However, this method may not fully reflect the overall precision and performance of the gear, and multiple measurement methods need to be combined for comprehensive evaluation.

[0006] 3. Overall error measurement method description: Use equipment such as a single-sided meshing checker for bevel gears, a double-sided meshing measuring instrument for bevel gears, or a rolling inspection machine for bevel gears to measure parameters such as transmission precision, contact pattern, vibration and noise of the spiral bevel gear as a whole. However, the measurement process of this method is relatively complex, and the requirements for equipment and operators are relatively high. At the same time, the measurement results may be affected by various factors, such as temperature, lubrication conditions, etc. Content of the Utility Model

[0007] Aiming at the deficiencies of the existing technology, the utility model proposes a precision detection device for quickly and accurately detecting spiral bevel gears at the original in-machine station.

[0008] The above object of the utility model is achieved by the following technical solutions:

[0009] A rapid and precise detection device for the accuracy of spiral bevel gears at the original machine station, characterized in that it includes a machine tool turntable, a linear motion combination unit, a laser distance sensor, a rotary motion combination unit, a rotary angle detection structure and a machine tool control system;

[0010] A workpiece support disk is arranged on the upper end of the machine tool turntable, and the upper end surface of the workpiece support disk is the workpiece installation surface;

[0011] The linear motion combination unit includes an A-direction linear motion mechanism and a B-direction linear motion mechanism; the power output end of the A-direction linear motion mechanism is fixedly connected to the laser distance sensor, and the outer side of the end of the A-direction linear motion mechanism away from its power output end is fixedly connected to the power output end of the B-direction linear motion mechanism. The motion direction of the A-direction linear motion is set at a 90° angle to the motion direction of the B-direction linear motion;

[0012] The rotary motion combination unit includes a lower cross arm, an upper vertical arm, a rotary mechanism rotating around the I-axis and a rotary mechanism rotating around the II-axis; the inner end of the lower cross arm is vertically and fixedly connected to one side of the machine tool turntable; the outer end of the lower cross arm is connected to the lower end of the upper vertical arm through a rotary mechanism rotating around the I-axis to realize the rotation of the upper vertical arm around the I-axis, where the I-axis is parallel to the central axis of the machine tool turntable; the upper end of the upper vertical arm is connected to the outer side of the end of the B-direction linear motion mechanism away from its power output end through a rotary mechanism rotating around the II-axis to realize the rotation of the linear motion combination unit around the II-axis, where the II-axis is in the horizontal direction and is perpendicular to both the motion direction of the A-direction linear motion mechanism and the motion direction of the B-direction linear motion mechanism;

[0013] The rotary angle detection structure is in three groups. The three groups of rotary angle detection structures are respectively installed on the rotary mechanism rotating around the I-axis, the rotary mechanism rotating around the II-axis and the upper end of the machine tool turntable, and are respectively used to detect the rotary angle of the laser distance sensor relative to the spiral bevel gear to be detected in the horizontal direction, the rotary angle of the laser distance sensor relative to the spiral bevel gear to be detected in the pitch direction, and the rotary angle of the spiral bevel gear to be detected on the machine tool turntable.

[0014] Moreover, both the linear motion mechanism in the A direction and the linear motion mechanism in the B direction adopt straight cylindrical linear motion mechanisms; the cylindrical linear motion device includes a first servo motor, a protective cover, a mounting frame, a motion shaft, a coupling, a rolling bearing, a lead screw shaft, a lead screw nut, a ball guide rail, and a grating scale displacement sensor; one end of the protective cover is fixedly connected to one end of the mounting frame, and the other end of the protective cover is fixedly connected to the first servo motor; the first servo motor is connected to the lead screw shaft through a coupling, the rolling bearing is fixedly installed at one end of the mounting frame close to the first servo motor and is rotationally supported in cooperation with the lead screw shaft, the lead screw nut is threadedly connected to the lead screw shaft, and the lead screw nut is fixedly connected to the hollow motion shaft; the ball guide rails are fixedly installed between the mounting frame and the hollow motion shaft in four directions, and the end of the hollow motion shaft away from the first servo motor constitutes a power output end, and a threaded hole is provided at the power output end; the grating scale displacement sensor includes a grating reading head and a grating scale, the grating reading head is fixed on the mounting frame, and the grating scale is fixedly installed on the hollow motion shaft.

[0015] Moreover, the rotary mechanism rotating about the I axis and the rotary mechanism rotating about the II axis adopt the same structural form, and both include a second servo motor, a tubular support, and an RV reducer; flanges are provided at both ends of the tubular support; one end flange of the tubular support of the rotary mechanism rotating about the I axis is fixedly connected to the corresponding second servo motor and the outer end of the lower cross arm through bolts, and the other end flange is fixedly connected to the corresponding RV reducer through bolts, and the output end of the RV reducer is connected to a flange, and this flange is fixedly connected to the lower end of the upper vertical arm; one end flange of the tubular support of the rotary mechanism rotating about the II axis is fixedly connected to the corresponding second servo motor and the upper end of the upper vertical arm through bolts, and the other end flange is fixedly connected to the corresponding RV reducer through bolts, and the output end of the RV reducer is connected to a flange, and this flange is fixedly connected to the outer side of the linear motion mechanism in the B direction through bolts.

[0016] Moreover, all three sets of rotary angle detection devices are composed of a grating reading head and an annular grating scale; the grating reading head is a fixed part, and the annular grating scale is a movable part; the grating reading heads on the rotary mechanism rotating about the I axis and the rotary mechanism rotating about the II axis are respectively fixed on the corresponding tubular supports, and the grating reading head on the upper end of the machine tool turntable is fixed on the tabletop of the machine tool turntable; the annular grating scales on the rotary mechanism rotating about the I axis and the rotary mechanism rotating about the II axis are respectively coaxially fixed on the connecting flanges at the output ends of the corresponding RV reducers; the annular grating scale on the upper end of the machine tool turntable is coaxially fixed on the workpiece support disk.

[0017] Moreover, the machine tool turntable includes a machine tool turntable housing, the workpiece support disk, a worm, a worm gear, a coupling, a YRT bearing, a bearing seat, a flange, and a third servo motor; the third servo motor is fixedly installed on the machine tool turntable housing, the third servo motor is drivingly connected to the worm through the coupling, the worm meshes with the worm gear, the worm gear is coaxially arranged inside the machine tool turntable housing, the upper end of the worm gear is fixedly connected to the workpiece support disk, and the workpiece support disk extends upward from the central hole on the table surface of the machine tool turntable housing; the lower end of the worm gear is rotatably connected to one side of the inner hole of the YRT bearing, and the other side of the inner hole of the YRT bearing is rotatably connected to the flange; the YRT bearing is fitted with the inner hole of the bearing seat through its outer surface, and the bearing seat is fixedly installed on the inner side of the bottom of the machine tool turntable housing.

[0018] The advantages and positive effects of the present utility model are as follows:

[0019] 1. The present utility model provides an original station precision detection device based on a numerical control machine tool. The detection instrument robotic arm composed of a linear motion combination unit and a rotary motion combination unit, etc., is assembled with the machine tool as a whole, which can accurately move the measuring instrument to the position to be measured of the workpiece, improve the displacement accuracy, reduce the displacement error, and ensure the rapidity and accuracy of workpiece measurement. The use of a non-contact laser distance sensor further improves the measurement accuracy and avoids the problems of wear and error in traditional contact measurement.

[0020] 2. The present utility model provides an innovative laser distance detection method, which can comprehensively and rapidly detect the tooth surface data, significantly improve the efficiency and integrity of data acquisition, and provide more rapid and accurate data support for timely adjusting and optimizing the machining process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 is an overall view of the rotary motion combination unit of the present utility model;

[0023] Figure 3 is Figure 2 a partial schematic view of point A of

[0024] Figure 4 is Figure 2 a front view of the upper arm part in

[0025] Figure 5 is Figure 4 a B-B cross-sectional view of

[0026] Figure 6 is a schematic diagram of the structure of the linear motion combination unit of the present utility model;

[0027] Figure 7It is the overall external view schematic diagram of the tubular linear motion device of the present utility model.

[0028] Figure 8 It is the cross-sectional view of the tubular linear motion device of the present utility model.

[0029] Figure 9 It is the end view of the power output end of the tubular linear motion device of the present utility model.

[0030] Figure 10 It is Figure 9 the C-C cross-sectional view of

[0031] Figure 11 It is the structural schematic diagram of the turntable of the machine tool of the present utility model; 11a, front view; 11b, D-D cross-sectional view in 11a; 11c, E-E cross-sectional view in 11a. Specific embodiments

[0032] The structure of the present utility model will be further described below in conjunction with the drawings and through embodiments. It should be noted that this embodiment is narrative rather than restrictive.

[0033] A precision detection device for quickly and accurately detecting the accuracy of spiral bevel gears at the in-machine original work station, please refer to Figures 1-11 , and its inventive point is: including a machine tool turntable 1, a linear motion combination unit 3, a laser distance sensor 6, a rotary motion combination unit 2, a rotary angle detection structure 5 and a machine tool control system, where the machine tool control system is not shown in the drawings.

[0034] The machine tool turntable is used to realize the positioning and installation of the spiral bevel gear workpiece 4, and can drive the spiral bevel gear to rotate around the center of the machine tool turntable.

[0035] The linear motion combination unit is used to realize linear motion in two directions with a 90° included angle, and it includes an A-direction linear motion mechanism 3.2 and a B-direction linear motion mechanism 3.1. Both the A-direction linear motion mechanism and the B-direction linear motion mechanism adopt straight-tube type linear motion mechanisms. The power output end of the A-direction linear motion mechanism is fixedly connected to the laser distance sensor, the outer side of the end of the A-direction linear motion mechanism far from its power output end is fixedly connected to the power output end of the B-direction linear motion mechanism, and the motion direction of the A-direction linear motion is set at a 90° included angle with the motion direction of the B-direction linear motion.

[0036] The lower cross arm 2.1, upper vertical arm 2.3, rotating mechanism 2.2 that rotates about the I axis, and rotating mechanism 2.4 that rotates about the II axis of the rotational motion combination unit. The inner end of the lower cross arm is vertically and fixedly connected to one side of the machine tool turntable housing through a flange 2.1.1. The outer end of the lower cross arm is connected to the lower end of the upper vertical arm through the rotating mechanism that rotates about the I axis, enabling the upper vertical arm to rotate about the I axis, where the I axis is parallel to the central axis of the machine tool turntable, also known as the Z-axis direction. The upper end of the upper vertical arm is connected to the outer side of one end of the B-direction linear motion mechanism away from its power output end through the rotating mechanism that rotates about the II axis, enabling the linear motion combination unit to rotate about the II axis, where the II axis is in the horizontal direction and is perpendicular to the motion directions of both the A-direction linear motion mechanism and the B-direction linear motion mechanism.

[0037] There are three sets of the rotational angle detection structures, which are respectively installed on the rotating mechanism that rotates about the I axis, the rotating mechanism that rotates about the II axis, and the upper end of the machine tool turntable, and are respectively used to detect the rotational angle of the laser distance sensor relative to the spiral bevel gear to be detected in the horizontal direction, the rotational angle of the laser distance sensor relative to the spiral bevel gear to be detected in the pitch direction, and the rotational angle of the spiral bevel gear to be detected on the machine tool turntable.

[0038] The A-direction linear motion mechanism and the B-direction linear motion mechanism are used to collect the displacement signals in the A direction and the B direction, and transmit the collected displacement signals to the machine tool control system; the rotational angle detection structure collects the rotational angle signals of the corresponding parts and transmits the rotational signals to the machine tool control system; the laser distance sensor collects the workpiece detection distance signal and transmits the detection signal to the machine tool control system. The machine tool control system is used to control the rotational angle of the machine tool turntable driving the workpiece, control the linear motion of the A-direction linear motion mechanism and the B-direction linear motion mechanism, and control the rotational motion of the rotating mechanism that rotates about the I axis and the rotating mechanism that rotates about the II axis.

[0039] The cylindrical linear motion device includes a first servo motor 3.1.7, a protective cover 3.1.6, a mounting bracket 3.1.1, a hollow motion shaft 3.1.2, a coupling 3.1.11, a rolling bearing 3.1.10, a lead screw shaft 3.1.3, a lead screw nut 3.1.9, a ball guide rail 3.1.8, and a grating scale displacement sensor. One end of the protective cover is fixedly installed at one end of the mounting bracket (the end away from the power output end) through bolts, and the other end of the protective cover is fixedly connected to the first servo motor through bolts. The first servo motor is connected to the lead screw shaft through a coupling and transmits power to the lead screw shaft. The rolling bearing is fixedly installed at one end of the mounting bracket close to the first servo motor through bolts, and the rolling bearing is rotationally supported and cooperated with the lead screw shaft. The lead screw nut is threadedly connected to the lead screw shaft, and the lead screw nut is fixedly installed on the hollow motion shaft through bolt connections. The ball guide rail is installed between the mounting bracket and the hollow motion shaft in four directions through bolts to achieve linear guidance of the hollow motion shaft. The end of the hollow motion shaft away from the first servo motor constitutes the power output end, and a threaded hole is provided at the power output end. The grating scale displacement sensor includes a grating reading head 3.1.5 and a linear grating scale 3.1.4. The grating reading head is fixed on the mounting bracket, and the grating scale is fixedly installed on the hollow motion shaft for collecting the displacement signal of the motion shaft. In this way, the driving and detection of the cylindrical linear motion mechanism are realized, so that the motion shaft axially moves within the mounting bracket.

[0040] The rotating mechanism rotating about the I axis and the rotating mechanism rotating about the II axis adopt the same structural form. Taking the rotating mechanism rotating about the II axis as an example in the attached drawings, both include a second servo motor 2.4.1, a tubular support 2.4.2, and an RV reducer 2.4.3. Flanges are provided at both ends of the tubular support. One end flange of the tubular support of the rotating mechanism rotating about the I axis is fixedly connected to the corresponding second servo motor and the outer end of the lower cross arm through bolts, and the other end flange is fixedly connected to the corresponding RV reducer through bolts. The output end of the RV reducer is connected to a flange, and this flange is fixedly connected to the lower end of the upper vertical arm. One end flange of the tubular support of the rotating mechanism rotating about the II axis is fixedly connected to the corresponding second servo motor and the upper end of the upper vertical arm through bolts, and the other end flange is fixedly connected to the corresponding RV reducer through bolts. The output end of the RV reducer is connected to a flange 2.4.4, and this flange is fixedly connected to the outer side of the linear motion mechanism in the B direction through bolts.

[0041] The machine tool turntable mainly includes a machine tool turntable housing 1.1, a workpiece support disk 1.2, a worm 1.5, a worm gear 1.4, a coupling, a YRT bearing 1.7, a bearing seat 1.6, a flange 1.8, and a third servo motor 1.3. The third servo motor is fixedly installed on the machine tool turntable housing, and transmits power to the worm through the coupling, and the worm then transmits the power to the worm gear. The worm gear is coaxially arranged inside the machine tool turntable housing, and the upper end of the worm gear is fixedly connected to the workpiece support disk. The workpiece support disk extends upward from the central hole of the tabletop of the machine tool turntable housing, and its upper end is the workpiece mounting surface. The lower end of the worm gear is rotatably connected to one side of the inner hole of the YRT bearing, and the other side of the inner hole of the YRT bearing is rotatably connected to the flange, which improves the connection stability, facilitates later maintenance and positioning, and at the same time can prevent the intrusion of dust, impurities and liquids, and protects the internal components. The YRT bearing is fitted with the inner hole of the bearing seat through its outer surface, and the bearing seat is fixedly installed on the inner side of the bottom of the machine tool turntable housing.

[0042] The three groups of rotary angle detection devices are all composed of a grating reading head and an annular grating scale. The grating reading head is a fixed part, and the annular grating scale is a movable part. The grating reading heads on the rotating mechanisms moving around the I axis and the rotating mechanisms moving around the II axis are respectively fixed on the corresponding tubular supports, and the grating reading head on the upper end of the machine tool turntable is fixed on the tabletop of the machine tool turntable. The annular grating scales on the rotating mechanisms moving around the I axis and the rotating mechanisms moving around the II axis are respectively coaxially fixed on the connecting flanges at the output ends of the corresponding RV reducers. The annular grating scale on the upper end of the machine tool turntable is coaxially fixed on the workpiece support disk.

[0043] When using the precision detection device for spiral bevel gears of the present utility model to quickly and accurately detect at the original machine tool station, after the workpiece is processed, the detection process is started at the original station without disassembling the workpiece. The machine tool control system controls the rotation angles of the I and II axes and the displacements of the linear motion devices in the A and B directions, so that the detection end of the laser distance sensor maintains a reasonable distance from the workpiece detection surface, facilitating data measurement. The machine tool control system controls the rotation of the worktable servo motor (the above-mentioned third servo motor), so that the workpiece support disk rotates, and then drives the workpiece to rotate. During the rotation of the workpiece, the rotation angles of the I and II axes, the displacements of the linear motion devices in the A and B directions, and the rotation angle of the machine tool turntable are simultaneously collected through the data acquisition system. Finally, the data calculation is completed. The laser distance sensor can collect the distances from the measurement end to different points on the workpiece surface, including but not limited to the coordinate point data of the gear tooth surface. Based on the obtained coordinate data of these points, the theoretical tooth surface of the spiral bevel gear is reconstructed by using the NUBRS surface algorithm or other algorithms, and further analyze the gear indexing error, part surface geometric error, etc., providing a theoretical basis for subsequent detection work.

[0044] Although embodiments and drawings of the present utility model are disclosed for illustrative purposes, those skilled in the art can understand that: within the spirit of the present utility model and the appended claims, the device is not only applicable to detecting the accuracy of bevel gears on a machine tool turntable, but also applicable to detecting gear workpieces installed on the workpiece spindle of a machine tool, and is equally applicable to detecting the accuracy of other detectable parts. Various substitutions, changes, and modifications are possible. Therefore, the scope of the present utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A device for quickly and accurately detecting the accuracy of spiral bevel gears at the original machine station, characterized in that: It includes a machine tool turntable, a linear motion combination unit, a laser distance sensor, a rotary motion combination unit, a rotation angle detection structure and a machine tool control system; A workpiece support plate is arranged at the upper end of the machine tool turntable, and the upper end surface of the workpiece support plate is the workpiece mounting surface; The linear motion combination unit comprises an A-direction linear motion mechanism and a B-direction linear motion mechanism; the power output end of the A-direction linear motion mechanism is fixedly connected to the laser distance sensor, the outer side of one end of the A-direction linear motion mechanism away from its power output end is fixedly connected to the power output end of the B-direction linear motion mechanism, and the motion direction of the A-direction linear motion is set at an angle of 90° to the motion direction of the B-direction linear motion; The rotary motion assembly unit comprises a lower horizontal arm, an upper vertical arm, a rotary mechanism moving around axis I, and a rotary mechanism moving around axis II; the inner end of the lower horizontal arm is vertically fixedly connected to one side of the machine tool turntable; the outer end of the lower horizontal arm is connected to the lower end of the upper vertical arm through a rotary mechanism moving around axis I, so that the upper vertical arm can rotate around axis I, wherein axis I is parallel to the central axis of the machine tool turntable; the upper end of the upper vertical arm is connected to the outer side of one end of the B-direction linear motion mechanism away from its power output end through a rotary mechanism moving around axis II, so that the linear motion assembly unit can rotate around axis II, wherein axis II is in the horizontal direction and is vertically arranged to the movement directions of the A-direction linear motion mechanism and the B-direction linear motion mechanism; The rotation angle detection structure consists of three groups, which are respectively installed on the rotating mechanism moving around axis I, the rotating mechanism moving around axis II and the upper end of the machine tool turntable, and are respectively used to detect the rotation angle of the laser distance sensor relative to the spiral bevel gear to be detected in the horizontal direction, the rotation angle of the laser distance sensor relative to the spiral bevel gear to be detected in the pitch direction, and the rotation angle of the spiral bevel gear to be detected on the machine tool turntable.

2. The device for detecting the accuracy of spiral bevel gears quickly and accurately at the original machine position according to claim 1 is characterized in that: The A-direction linear motion mechanism and the B-direction linear motion mechanism both adopt straight-cylinder linear motion mechanisms; the straight-cylinder linear motion mechanism includes a first servo motor, a protective cover, a mounting frame, a hollow motion shaft, a coupling, a rolling bearing, a screw shaft, a screw nut, a ball guide and a grating scale displacement sensor; one end of the protective cover is fixedly connected to one end of the mounting frame, and the other end of the protective cover is fixedly connected to the first servo motor; the first servo motor is connected to the screw shaft through a coupling, the rolling bearing is fixedly mounted on the mounting frame at one end close to the first servo motor, and cooperates with the screw shaft rotation support, the screw nut is threadedly connected to the screw shaft, and the screw nut is fixedly connected to the hollow motion shaft; the ball guide is fixedly mounted between the mounting frame and the hollow motion shaft in four directions, and the end of the hollow motion shaft away from the first servo motor constitutes a power output end, and a threaded hole is provided at the power output end; the grating scale displacement sensor includes a grating reading head and a grating scale, the grating reading head is fixed on the mounting frame, and the grating scale is fixedly mounted on the hollow motion shaft.

3. The device for detecting the accuracy of spiral bevel gears quickly and accurately at the original machine position according to claim 1 is characterized in that: The rotating mechanism moving around axis I and the rotating mechanism moving around axis II adopt the same structural form, both of which include a second servo motor, a tubular support, and an RV reducer; flanges are provided at both ends of the tubular support; one end flange of the tubular support of the rotating mechanism moving around axis I is fixedly connected to the corresponding second servo motor and the outer end of the lower cross arm by bolts, and the other end flange is fixedly connected to the corresponding RV reducer by bolts, and the output end of the RV reducer is connected to the flange, which is fixedly connected to the lower end of the upper vertical arm; one end flange of the tubular support of the rotating mechanism moving around axis II is fixedly connected to the corresponding second servo motor and the upper end of the upper vertical arm by bolts, and the other end flange is fixedly connected to the corresponding RV reducer by bolts, and the output end of the RV reducer is connected to the flange, which is fixedly connected to the outer side of the B-direction linear motion mechanism by bolts.

4. The device for detecting the accuracy of spiral bevel gears quickly and accurately at the original position of the machine according to claim 3 is characterized in that: The three groups of rotation angle detection structures are composed of a grating reading head and an annular grating scale; the grating reading head is a fixed part, and the annular grating scale is a movable part; the grating reading head on the rotating mechanism moving around axis I and the grating reading head on the rotating mechanism moving around axis II are respectively fixed on the corresponding tubular supports, and the grating reading head on the upper end of the machine tool turntable is fixed on the table top of the machine tool turntable; the annular grating scale on the rotating mechanism moving around axis I and the annular grating scale on the rotating mechanism moving around axis II are respectively coaxially fixed on the connecting flanges at the output ends of the corresponding RV reducers; the annular grating scale on the upper end of the machine tool turntable is coaxially fixed on the workpiece support plate.

5. The device for detecting the accuracy of spiral bevel gears quickly and accurately at the original machine position according to claim 1, characterized in that: The machine tool turntable includes a machine tool turntable housing, the workpiece support plate, a worm, a worm wheel, a coupling, a YRT bearing, a bearing seat, a flange and a third servo motor; the third servo motor is fixedly installed on the machine tool turntable housing, the third servo motor is connected to the worm drive through a coupling, the worm is meshed with the worm wheel, the worm wheel is coaxially arranged in the machine tool turntable housing, the upper end of the worm wheel is fixedly connected to the workpiece support plate, and the workpiece support plate extends upward from the center hole on the table surface of the machine tool turntable housing; the lower end of the worm wheel is rotatably connected to one side of the inner hole of the YRT bearing, and the other side of the inner hole of the YRT bearing is rotatably connected to the flange; the YRT bearing cooperates with the inner hole of the bearing seat through the outer surface, and the bearing seat is fixedly installed on the inner side of the bottom of the machine tool turntable housing.

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