A five-axis coordinate measuring machine

Abstract

This application discloses a five-axis coordinate measuring machine, relating to the technical field of precision measuring equipment. It addresses the problems in existing technologies where multi-joint manipulators are used to adjust the probe posture, such as insufficient structural rigidity, poor end-effector stability, and significant error accumulation, leading to reduced measurement accuracy for complex workpieces. The five-axis coordinate measuring machine includes a frame, a measuring platform, a drive frame assembly, a measuring component, and a workpiece fixture for holding the workpiece to be measured. The drive frame assembly drives the probe of the measuring component to move along mutually perpendicular X, Y, and Z axes. The measuring component includes a probe holder connected to the drive frame assembly and a probe connected to the probe holder, the probe having a measuring end for contacting the surface of the workpiece. The workpiece fixture has a first rotating part for driving the workpiece to be measured to rotate about a first rotation axis, and a second rotating part for driving the workpiece to be measured to rotate about a second rotation axis.

Description

Technical Field

[0001] This application relates to the technical field of precision measuring equipment, specifically to a five-axis coordinate measuring machine. Background Technology

[0002] In fields such as machining, precision manufacturing, aerospace, automotive parts, and mold making, coordinate measurements are frequently required to determine the dimensional parameters, form and position errors, and spatial contours of workpieces for machining quality assessment, assembly verification, and product consistency control. Current coordinate measurement methods typically involve sampling feature points, feature lines, or feature surfaces on the workpiece surface using a probe, and then performing coordinate calculations to obtain the geometric parameters of the workpiece. For workpieces with relatively regular structures and fully exposed measurement surfaces, conventional coordinate measurement methods can meet the requirements. However, for workpieces with complex curved surfaces, concave structures, irregular contours, partially obscured areas, or measurement blind spots, the probe's accessibility is poor, easily leading to problems where some areas are difficult to measure effectively, thus affecting the measurement coverage and efficiency.

[0003] To improve the measurement adaptability of complex workpieces, existing technologies have proposed multi-degree-of-freedom measuring devices such as five-axis coordinate measuring machines (CMMs). These devices typically introduce rotational degrees of freedom on top of three-axis linear motion to achieve multi-angle measurements of the probe relative to the workpiece. A common form employs a multi-joint manipulator arm structure, with the probe positioned at the end of the arm. Through the coordinated rotation of multiple joints, the probe can approach the workpiece surface in different postures, thereby enhancing the measurement capability for complex curved surfaces, inclined surfaces, and partially obscured areas. This type of structure, to a certain extent, overcomes the limitations of traditional fixed-posture measurement methods and can meet the measurement needs under some complex working conditions.

[0004] However, existing five-axis coordinate measuring machines, especially those using multi-joint manipulators for probe posture adjustment, still have shortcomings in practical applications: Because the manipulator needs to continuously rotate or swing through multiple joints to adjust the probe posture, the kinematic chain is relatively long, the mechanism rigidity is relatively weak, and the assembly clearances, transmission errors, return errors, and vibration accumulation at each joint can easily amplify the positional accuracy of the end-effector probe. Furthermore, when measuring complex workpieces, the manipulator often needs to undergo significant posture changes, making it difficult to guarantee the stability and repeatability of the end-effector probe, thus affecting the accuracy of the final measurement results. In addition, probe path planning and collision avoidance control are more complex when probing in confined spaces or measurement blind spots, further increasing the measurement difficulty and error risk. Summary of the Invention

[0005] Therefore, this application provides a five-axis coordinate measuring machine to solve the problems of insufficient rigidity of the mechanism, poor stability of the end probe, and significant error accumulation when using a multi-joint manipulator to adjust the probe posture in the prior art, which leads to a reduction in the measurement accuracy of complex workpieces.

[0006] To achieve the above objectives, this application provides the following technical solution: A five-axis coordinate measuring machine includes a frame, a measuring platform disposed on the frame, a drive frame assembly disposed on the measuring platform, a measuring component disposed on the drive frame assembly, and a workpiece fixture disposed on the measuring platform for holding the workpiece to be measured. The drive frame assembly is used to drive the probe of the measuring assembly to move along mutually perpendicular X-axis, Y-axis and Z-axis directions; The measuring assembly includes a probe holder connected to the drive frame assembly and a probe connected to the probe holder. The probe has a measuring end for contacting the surface of the workpiece to be measured, so as to perform coordinate measurement on the workpiece. The workpiece fixture has a first rotating part for driving the workpiece to be tested to rotate around a first rotating axis, and a second rotating part for driving the workpiece to be tested to rotate around a second rotating axis. The first rotating axis is parallel to the X-axis or Y-axis direction, and the second rotating axis is perpendicular to the first rotating axis. The drive frame assembly and the workpiece fixture drive each other so that while the probe moves along the X-axis, Y-axis and Z-axis, the workpiece to be measured is driven to rotate around the first rotation axis and / or the second rotation axis by the workpiece fixture to adjust the posture of the workpiece to be measured, so that the measuring end of the probe contacts the surface to be measured of the workpiece.

[0007] Optionally, the drive frame assembly includes a first frame connected to the measurement platform, a second frame slidably connected to the first frame and connected to the measurement component, a first drive component connected to the first frame and used to drive the second frame to move along the length extension direction of the first frame, a second drive component connected to the second frame and used to drive the measurement component to move along the length extension direction of the second frame, and a third drive component connected to the second frame and used to drive the measurement component to move along the Z-axis extension direction. The length of the first frame extends parallel to the X-axis, and the length of the second frame extends parallel to the Y-axis.

[0008] Optionally, the first frame includes two first columns connected to the measuring platform and a first crossbeam connected between the two first columns; The second frame includes a second crossbeam, a portal-shaped slide block connected to one end of the second crossbeam and slidingly straddling the first crossbeam, and a second column connected to the other end of the second crossbeam and slidably supported on the measuring platform; The first drive assembly is connected to one end of the first crossbeam and is used to drive the portal slide to move along the length extension direction of the first crossbeam, so as to drive the second frame to move. The second drive component is connected to one end of the second crossbeam and is used to drive the measuring component to move along the length extension direction of the second crossbeam.

[0009] Optionally, the first drive assembly includes a first motor connected to the first crossbeam, a first pulley drive group connected to the output shaft of the first motor, and a first rope traction assembly; the first rope traction assembly includes a first rope reel and a second rope reel rotatably connected to the two ends of the first crossbeam, and a first rope wound between the first rope reel and the second rope reel, the first rope being connected to the portal slide, and the first rope reel near the first pulley drive group being drively connected to the first pulley drive group; The second drive assembly includes a second motor connected to the second crossbeam, a second pulley drive group connected to the output shaft of the second motor, and a second rope traction assembly; the second rope traction assembly includes a third rope reel and a fourth rope reel rotatably connected to both ends of the second crossbeam, and a second rope wound between the third rope reel and the fourth rope reel, the second rope being connected to the third drive assembly, the measuring assembly being connected to the third drive assembly, and the third rope reel near the second pulley drive group being drive-connected to the second pulley drive group.

[0010] Optionally, the third drive assembly includes a sleeve fitted on and slidably connected to the second crossbeam, a third motor connected to the sleeve, a third pulley drive assembly connected to the output shaft of the third motor, and a third rope traction assembly, wherein the second rope is connected to the sleeve; The probe holder is slidably connected to the sleeve; The third rope traction assembly includes multiple fifth rope reels rotatably connected to the sleeve and a third rope wound between the multiple fifth rope reels. One end of the third rope is connected to the probe seat, and one of the multiple fifth rope reels is connected to the third pulley drive group for transmission, so as to drive the third rope to move under the drive of the third motor, thereby driving the probe seat to move along the Z-axis.

[0011] Optionally, the portal slide is connected to a plurality of first air floats for cooperating with the first crossbeam to form an air float support, the bottom of the second column is connected to a second air float for cooperating with the measuring platform to form an air float support, and the sleeve is connected to a plurality of third air floats for cooperating with the second crossbeam to form an air float support.

[0012] Optionally, the sleeve is connected with a plurality of limiting frames along the Z-axis, the limiting frames are arranged around the probe seat, and the limiting frames are connected with a plurality of air-floating pads for cooperating with the probe seat to form air-floating guidance and limiting; The air float has crisscrossing pressure equalization grooves on one side facing the probe base, and a central air chamber communicating with the pressure equalization grooves is provided inside the air float. An air supply hole communicating with the central air chamber is opened on the side of the air float. The limiting frame is connected to a ball head adjusting component. One end of the ball head adjusting component is provided with a hemispherical support part. The side of the air float away from the pressure equalization groove is provided with a hemispherical groove that cooperates with the hemispherical support part. The ball head adjusting component has multiple elastic grooves at its end near the hemispherical support.

[0013] Optionally, the workpiece fixture includes a fixture frame detachably connected to the measuring platform, a rotary table rotatably connected to the fixture frame via a first rotary axis, a fixture component rotatably connected to the rotary table via a second rotary axis and used for mounting the workpiece to be measured, a first rotating part connected to the fixture frame and used for driving the rotary table to rotate around the first rotary axis, and a second rotating part connected to the rotary table and used for driving the fixture component to rotate around the second rotary axis; the first rotating part includes a fourth motor, and the second rotating part includes a fifth motor.

[0014] Optionally, the fixture frame includes a first mounting plate detachably connected to the measuring platform, and a second mounting plate and a third mounting plate respectively connected to both ends of the first mounting plate; The first rotating shaft includes a first shaft segment connected to one end of the rotating table and rotatably connected to the second mounting plate, and a second shaft segment connected to the other end of the rotating table and rotatably connected to the third mounting plate; The first shaft segment extends through the second mounting plate and is connected to the output shaft of the fourth motor via a pulley and a drive belt. The second shaft segment extends through the third mounting plate, and the end of the shaft is connected to a fourth mounting plate. The fifth motor is connected to the fourth mounting plate, and the output shaft of the fifth motor is connected to the clamping component via a pulley and a transmission belt. The third mounting plate has a clearance groove for avoiding the transmission belt.

[0015] Optionally, the five-axis coordinate measuring machine also includes an industrial camera and an industrial control box; The industrial camera is used to acquire continuous frame images of the workpiece under test in order to obtain the posture image information of the workpiece under test. The industrial camera, the drive frame assembly, the measuring assembly, and the workpiece fixture are all electrically connected to the industrial control box. The industrial control box is used to control the drive frame assembly and the workpiece fixture to move in coordination according to the posture image information and / or a preset path, so that the probe can measure the workpiece to be measured.

[0016] Compared with the prior art, this application has at least the following beneficial effects: The drive frame assembly provides the probe with three degrees of freedom for linear motion in the X, Y, and Z axes, while the workpiece fixture provides the workpiece's attitude adjustment freedom around the first and second rotation axes. During measurement, the drive frame assembly first moves the probe to the vicinity of the target measurement area, and then the workpiece fixture drives the workpiece to rotate around the first and / or second rotation axes, so that the surface to be measured faces the measuring end of the probe, and the measuring end contacts the surface to be measured at a suitable angle, thereby completing the coordinate measurement. Through the above-mentioned combination of "three-axis linear movement of the probe + two-axis rotation and attitude adjustment of the workpiece," on the one hand, the accessibility to complex curved surfaces, obstructed areas, and measurement blind spots can be improved without relying on large swings of the probe's multiple joints; on the other hand, the probe's motion is linear motion in mutually perpendicular directions, the kinematic chain is relatively simplified and has high rigidity, which helps to reduce the error accumulation and end-effector attitude fluctuations caused by multi-joint rotation, thereby improving the stability and repeatability of the measurement process and improving the measurement accuracy of complex workpieces. Attached Figure Description

[0017] To more intuitively illustrate the prior art and this application, several exemplary figures are provided below. It should be understood that the specific shapes and structures shown in the figures should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary figures, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0018] Figure 1 This is a schematic diagram of the overall structure of a five-axis coordinate measuring machine according to one embodiment of this application; Figure 2 for Figure 1 Partial structural diagram; Figure 3 for Figure 2 Another perspective view; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view at point B in the middle; Figure 6 for Figure 3 Partial structural diagram; Figure 7 for Figure 6 Another perspective view; Figure 8 for Figure 7 Partial structural diagram; Figure 9 for Figure 8 Partial structural diagram; Figure 10 for Figure 9 Partial structural diagram; Figure 11 for Figure 10 Partial structural diagram; Figure 12 A schematic diagram illustrating the fit between a ball head adjustment component and an air float of a five-axis coordinate measuring machine, provided in one embodiment of this application; Figure 13 This application provides a schematic diagram of the structure of an air-bearing pad for a five-axis coordinate measuring machine according to one embodiment of the present application. Figure 14 This is a schematic diagram of the structure of a ball head adjustment component of a five-axis coordinate measuring machine according to one embodiment of this application; Figure 15 This is a schematic diagram of the structure of a workpiece fixture for a five-axis coordinate measuring machine provided in one embodiment of this application; Figure 16 for Figure 15 Partial structural explosion diagram; Figure 17 for Figure 16 A partial structural diagram.

[0019] Explanation of reference numerals in the attached figures: 1. Measuring platform; 2. Drive frame assembly; 21. First frame; 211. First crossbeam; 212. First column; 22. Second frame; 221. Second crossbeam; 222. Portal slide; 2221. First air float; 223. Second column; 2231. Second air float; 224. Second drive assembly; 2241. Second motor; 2242. Second pulley drive group; 2243. Third rope reel; 2244. Fourth rope reel; 2245. Second rope; 213. First drive assembly; 2131. First motor; 2132. First pulley drive group; 2133. First rope reel; 2134. Second rope reel; 2135. First rope; 23. Third drive assembly; 231. Sleeve; 2311. Third air float; 232. Third motor; 233. Third pulley drive group 1. Moving assembly; 234. Fifth rope reel; 235. Third rope; 236. Limiting frame; 237. Ball head adjustment component; 2371. Hemispherical support; 2372. Elastic groove; 238. Air float; 2381. Hemispherical groove; 2382. Air supply hole; 2383. Central air chamber; 2384. Pressure equalization groove; 3. Measuring assembly; 31. Probe holder; 32. Probe; 4. Workpiece fixture; 41. Fixture frame; 411. First mounting plate; 412. Second mounting plate; 413. Third mounting plate; 4131. Clearance groove; 42. Rotary table; 43. Fixture component; 44. First rotating shaft; 441. First shaft section; 442. Second shaft section; 45. Second rotating shaft; 46. First rotating part; 47. Second rotating part; 471. Fourth mounting plate; 5. Workpiece to be measured; 6. Industrial camera; 7. Frame. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0022] refer to Figure 1-3 This application discloses a five-axis coordinate measuring machine, including a frame 7, a measuring platform 1 disposed on the frame 7, a drive frame assembly 2 disposed on the measuring platform 1, a measuring assembly 3 disposed on the drive frame assembly 2, and a workpiece clamp 4 disposed on the measuring platform 1 for clamping the workpiece 5 to be measured. The drive frame assembly 2 is used to drive the probe 32 of the measuring assembly 3 to move along the mutually perpendicular X-axis, Y-axis and Z-axis directions; The measuring component 3 includes a probe holder 31 connected to the drive frame assembly 2 and a probe 32 connected to the probe holder 31. The probe 32 has a measuring end for contacting the surface of the workpiece 5 to be measured, so as to perform coordinate measurement on the workpiece 5. The workpiece fixture 4 has a first rotating part 46 for driving the workpiece 5 to be measured to rotate around a first rotating axis 44, and a second rotating part 47 for driving the workpiece 5 to be measured to rotate around a second rotating axis 45. The first rotating axis 44 is parallel to the X-axis or Y-axis direction, and the second rotating axis 45 is perpendicular to the first rotating axis 44. The drive frame assembly 2 and the workpiece fixture 4 are driven together so that while the probe 32 moves along the X-axis, Y-axis and Z-axis, the workpiece 5 to be measured is driven to rotate around the first rotation axis 44 and / or the second rotation axis 45 through the workpiece fixture 4 to adjust the posture of the workpiece 5 to be measured, so that the measuring end of the probe 32 contacts the surface to be measured of the workpiece 5.

[0023] The drive frame assembly 2 provides the probe 32 with three degrees of freedom for linear motion in the X, Y, and Z axes, while the workpiece fixture 4 provides the workpiece 5 to be measured with degrees of freedom for attitude adjustment around the first rotation axis 44 and the second rotation axis 45. During the measurement process, the probe 32 can be moved to the vicinity of the target measurement area by the drive frame assembly 2, and then the workpiece 5 can be driven to rotate around the first rotation axis 44 and / or the second rotation axis 45 by the workpiece fixture 4, so that the surface to be measured faces the measuring end of the probe 32 and the measuring end contacts the surface to be measured at a suitable angle, thereby completing the coordinate measurement. Through the above-mentioned combination of "three-axis linear movement of the probe 32 + two-axis rotation and attitude adjustment of the workpiece", on the one hand, the accessibility of complex curved surfaces, obstructed areas, and measurement dead angles can be improved without relying on the large swing of the multi-joints of the probe 32; on the other hand, the motion of the probe 32 is a linear motion in mutually perpendicular directions, the kinematic chain is relatively simplified and the rigidity is high, which helps to reduce the error accumulation and end attitude fluctuation caused by multi-joint rotation, thereby improving the stability and repeatability of the measurement process and improving the measurement accuracy of complex workpieces.

[0024] It should be noted that the probe 32 involved in this application is a contact measurement. The basic principle of contact measurement is that the measuring end of the probe 32 makes physical contact with the surface of the workpiece 5 to be measured. When the measuring end contacts the surface to be measured, the probe 32 outputs a trigger signal or a displacement response signal, and the system records the position coordinate information of the probe 32 in space at that moment. By acquiring the coordinate data of multiple measurement points, the geometric features of the workpiece 5 to be measured, such as points, lines, surfaces, holes, grooves, and curved surface contours, can be fitted, calculated, and evaluated, thereby obtaining measurement results such as dimensional parameters and form and position errors. Compared with non-contact measurement methods, contact measurement is less affected by optical factors such as reflection and color differences on the workpiece surface, and is suitable for coordinate measurement scenarios with high geometric accuracy requirements. In this application, through the coordinated attitude adjustment of the drive frame assembly 2 and the workpiece fixture 4, the contact probe 32 can approach and contact the surface to be measured in a relatively stable posture, which is beneficial to leveraging the advantages of high accuracy and good repeatability of contact measurement.

[0025] The drive frame assembly 2 includes a first frame 21 connected to the measuring platform 1, a second frame 22 slidably connected to the first frame 21 and connected to the measuring component 3, a first drive component 213 connected to the first frame 21 and used to drive the second frame 22 to move along the length extension direction of the first frame 21, a second drive component 224 connected to the second frame 22 and used to drive the measuring component 3 to move along the length extension direction of the second frame 22, and a third drive component 23 connected to the second frame 22 and used to drive the measuring component 3 to move along the Z-axis extension direction. The length of the first frame 21 extends parallel to the X-axis, and the length of the second frame 22 extends parallel to the Y-axis.

[0026] The first frame 21 serves as the basic support structure for the drive frame assembly 2 and is mounted on the measurement platform 1. The second frame 22 is slidably connected to the first frame 21, and the measurement assembly 3 is mounted on the second frame 22. The first drive assembly 213 drives the second frame 22 to move along the length extension direction of the first frame 21, thereby adjusting the position of the measurement assembly 3 in the X-axis direction. The second drive assembly 224 drives the measurement assembly 3 to move along the length extension direction of the second frame 22, thereby adjusting the position of the measurement assembly 3 in the Y-axis direction. The third drive assembly 23 drives the measurement assembly 3 to move along the Z-axis, thereby adjusting the position of the measurement assembly 3 in the height direction. Since the length extension direction of the first frame 21 is parallel to the X-axis direction, and the length extension direction of the second frame 22 is parallel to the Y-axis direction, and the X, Y, and Z axes cooperate to form a three-dimensional motion relationship, the measurement assembly 3 can achieve relatively clear coordinate positioning and path movement in three-dimensional space. This structure divides the three-way motion of the measuring component 3 into three driving components: the first driving component 213, the second driving component 224, and the third driving component 23. This helps to reduce the mutual coupling between the motions in each direction and facilitates motion control and position calibration.

[0027] refer to Figure 2-9 The first frame 21 includes two first columns 212 connected to the measuring platform 1 and a first crossbeam 211 connected between the two first columns 212; The second frame 22 includes a second crossbeam 221, a portal slide 222 connected to one end of the second crossbeam 221 and slidingly straddling the first crossbeam 211, and a second column 223 connected to the other end of the second crossbeam 221 and slidably supported on the measuring platform 1. The first drive assembly 213 is connected to one end of the first crossbeam 211 and is used to drive the gantry slide 222 to move along the length extension direction of the first crossbeam 211, so as to drive the second frame 22 to move. The second drive assembly 224 is connected to one end of the second crossbeam 221 and is used to drive the measuring assembly 3 to move along the length extension direction of the second crossbeam 221.

[0028] Two first columns 212 and a first crossbeam 211 form a bridge-like support structure for the first frame 21. The first crossbeam 211 spans above the measuring platform 1, providing a load-bearing and guiding foundation for the movement of the second frame 22. One end of the second crossbeam 221 of the second frame 22 slides across the first crossbeam 211 via a portal-shaped slide block 222, and the other end is slidably supported on the measuring platform 1 via a second column 223. During the measurement process, the first drive assembly 213 acts on one end of the first crossbeam 211 and drives the portal slide 222 to move along the length of the first crossbeam 211. The portal slide 222 drives the second crossbeam 221 to translate along the X-axis, and the second column 223 simultaneously slides on the measurement platform 1 to suppress the deflection and swaying of the end of the second crossbeam 221 caused by overhang or off-center loading. On this basis, the second drive assembly 224 is installed on one end of the second crossbeam 221 and drives the measuring assembly 3 to move along the length of the second crossbeam 221, realizing the positioning and scanning of the measuring assembly 3 in the Y-axis direction. Through the above structural arrangement, the X-axis movement is guided by the sliding cooperation between the portal slide 222 and the first crossbeam 211, and the Y-axis movement is realized by the relative sliding between the measuring assembly 3 and the second crossbeam 221. At the same time, the support of the second column 223 on the far end of the second crossbeam 221 can effectively reduce the influence of deflection and moment caused by the structural span.

[0029] The first drive assembly 213 includes a first motor 2131 connected to the first crossbeam 211, a first pulley drive group 2132 connected to the output shaft of the first motor 2131, and a first rope traction assembly. The first rope traction assembly includes a first rope reel 2133 and a second rope reel 2134 rotatably connected to the two ends of the first crossbeam 211, and a first rope 2135 wound between the first rope reel 2133 and the second rope reel 2134. The first rope 2135 is connected to the portal slide 222, and the first rope reel 2133 near the first pulley drive group 2132 is connected to the first pulley drive group 2132 in a transmission connection. The second drive assembly 224 includes a second motor 2241 connected to the second crossbeam 221, a second pulley drive group 2242 connected to the output shaft of the second motor 2241, and a second rope traction assembly. The second rope traction assembly includes a third rope reel 2243 and a fourth rope reel 2244 rotatably connected to both ends of the second crossbeam 221, and a second rope 2245 wound between the third rope reel 2243 and the fourth rope reel 2244. The second rope 2245 is connected to the third drive assembly 23. The measuring assembly 3 is connected to the third drive assembly 23. The third rope reel 2243, which is close to the second pulley drive group 2242, is connected to the second pulley drive group 2242 in a transmission connection.

[0030] Both the first drive assembly 213 and the second drive assembly 224 adopt a transmission method of "motor-pulley drive group-rope traction assembly". Specifically, after the first motor 2131 outputs power, it is transmitted to the first rope reel 2133 through the first pulley drive group 2132, causing the first rope reel 2133 to rotate and drive the first rope 2135 wound between the first rope reel 2133 and the second rope reel 2134 to move. Since the first rope 2135 is connected to the portal slide 222, the portal slide 222 moves along the length extension direction of the first crossbeam 211 under the traction of the first rope 2135, thereby driving the second frame 22 to move in the X-axis direction as a whole. Similarly, after the second motor 2241 outputs power, it is transmitted to the third rope reel 2243 via the second pulley drive group 2242. This causes the third rope reel 2243 to drive the second rope 2245, which is wound between the third rope reel 2243 and the fourth rope reel 2244. Since the second rope 2245 is connected to the third drive component 23, and the measuring component 3 is connected to the third drive component 23, the third drive component 23 and the measuring component 3 move along the length extension direction of the second crossbeam 221 under the traction of the second rope 2245, thereby realizing movement in the Y-axis direction. Through the above-mentioned rope traction drive structure, the motor output end and the driven moving part can be arranged separately. While meeting the stroke requirements, the weight of the drive component carried by the moving part is reduced, which is beneficial to reducing the moment of inertia, improving the start-stop response speed and running smoothness. At the same time, the pulley drive group and the rope traction component can achieve power transmission over a longer stroke. The structural arrangement is more flexible and easy to adapt to the spatial layout of the first crossbeam 211 and the second crossbeam 221.

[0031] It should be noted that the first pulley drive group 2132 and the second pulley drive group 2242 can be combinations of multiple pulleys and drive belts. Using a combination of multiple pulleys and drive belts allows for adjustments to the power transmission path based on the installation space, such as changing the transmission direction or staggering the installation positions of the motor and the rope winding wheel, thus facilitating structural arrangement within the limited space of the first crossbeam 211 or the second crossbeam 221. Furthermore, different pulley diameters can be matched to form a predetermined transmission ratio, thereby matching the speed and output torque of the rope winding wheel, ensuring that the rope winding wheel meets traction speed requirements while providing a suitable traction force output.

[0032] In some embodiments, the first motor 2131 and / or the second motor 2241 can also drive the corresponding rope traction assembly via a gear set. When using gear set transmission, a relatively stable transmission ratio can be achieved by utilizing gear meshing, and high transmission rigidity and low transmission slippage risk can be obtained where the structure allows, making it suitable for scenarios with high requirements for traction output or transmission synchronization.

[0033] refer to Figure 7-9The third drive assembly 23 includes a sleeve 231 sleeved on and slidably connected to the second crossbeam 221, a third motor 232 connected to the sleeve 231, a third pulley drive group 233 connected to the output shaft of the third motor 232, and a third rope traction assembly, with the second rope 2245 connected to the sleeve 231. The probe holder 31 is slidably connected to the sleeve 231; The third rope traction assembly includes multiple fifth rope reels 234 rotatably connected to the sleeve 231 and a third rope 235 wound between the multiple fifth rope reels 234. One end of the third rope 235 is connected to the probe seat 31. One of the multiple fifth rope reels 234 is connected to the third pulley drive group 233 for transmission, so as to drive the third rope 235 to move under the drive of the third motor 232, thereby driving the probe seat 31 to move along the Z-axis.

[0034] The sleeve 231 is fitted onto the second crossbeam 221 and slidably connected to the second crossbeam 221. The second rope 2245 is connected to the sleeve 231. Therefore, when the second drive assembly 224 is working, the sleeve 231 can move along the length of the second crossbeam 221 as a moving base supporting the probe seat 31 to achieve linkage displacement in the Y-axis direction. The probe seat 31 is slidably connected to the sleeve 231. After the third motor 232 outputs power, it is transmitted through the third pulley transmission group 233 to the drive rope wheel (the fifth rope wheel 234 directly connected to the third pulley transmission group 233) among the multiple fifth rope wheels 234, so that the third rope 235 can be wound around the multiple fifth rope wheels 234 and generate traction motion, thereby driving the probe seat 31 connected to the third rope 235 to move up and down in the Z-axis direction.

[0035] The use of multiple fifth rope reels 234 in conjunction with the third rope 235 facilitates the guidance and reversal of the rope direction within the limited space of the frame 231, making the structural layout between the third motor 232, the rope reels and the probe seat 31 more compact, and also helps to match the traction direction and transmission stroke as needed.

[0036] The portal slide 222 is connected to a plurality of first air floats 2221 for cooperating with the first crossbeam 211 to form an air float support. The bottom of the second column 223 is connected to a second air float 2231 for cooperating with the measuring platform 1 to form an air float support. The sleeve 231 is connected to a plurality of third air floats 2311 for cooperating with the second crossbeam 221 to form an air float support.

[0037] Multiple first air-float discs 2221 on the portal slide 222 are arranged opposite to the first crossbeam 211, the second air-float disc 2231 at the bottom of the second column 223 is arranged opposite to the measuring platform 1, and multiple third air-float discs 2311 on the sleeve 231 are arranged opposite to the second crossbeam 221. When each air-float disc is in the air-supply state, an air film gap is formed between it and the corresponding mating component, so that the portal slide 222 relative to the first crossbeam 211, the second column 223 relative to the measuring platform 1, and the sleeve 231 relative to the second crossbeam 221 can achieve air-float support movement.

[0038] Specifically, the first air-bearing plate 2221 is used to form a low-friction support and guiding relationship between the portal slide 222 and the first crossbeam 211, thereby reducing the frictional resistance of the portal slide 222 when moving along the first crossbeam 211 and improving the smoothness of movement; the second air-bearing plate 2231 is used to provide air-bearing support for the bottom of the second column 223, so that the distal end of the second frame 22 obtains stable load during follow-up movement, reducing wear, friction fluctuations and creep caused by direct contact support; the third air-bearing plate 2311 is used to form a low-friction support and guiding relationship between the sleeve 231 and the second crossbeam 221. By setting air-bearing plates at corresponding positions on the portal slide 222, the second column 223 and the sleeve 231, mechanical contact friction and vibration transmission in the relevant motion chains of the X-axis, Y-axis and Z-axis can be reduced, the start-stop impact and the risk of local jamming can be reduced, and the impact of wear on the support parts on long-term accuracy can be reduced.

[0039] It should be noted that the air flotation disc is existing technology and will not be described in detail in this application.

[0040] refer to Figure 10-14 The sleeve 231 is connected to multiple limiting frames 236 along the Z-axis. The limiting frames 236 are arranged around the probe base 31. The limiting frames 236 are connected to multiple air floats 238 for cooperating with the probe base 31 to form air float guidance and limiting. The air float 238 has crisscrossing pressure equalization grooves 2384 on the side facing the probe seat 31. The air float 238 has a central air chamber 2383 that communicates with the pressure equalization grooves 2384. The side of the air float 238 has an air supply hole 2382 that communicates with the central air chamber 2383. The limiting frame 236 is connected to a ball head adjustment component 237. One end of the ball head adjustment component 237 is provided with a hemispherical support part 2371. The side of the air float 238 away from the pressure equalization groove 2384 is provided with a hemispherical groove 2381 that cooperates with the hemispherical support part 2371, so that the air float 238 can swing at a small angle relative to the limiting frame 236. The ball head adjusting member 237 has multiple elastic grooves 2372 at the end near the hemispherical support part 2371.

[0041] Multiple limiting frames 236 are spaced apart on the sleeve 231 along the Z-axis, and each limiting frame 236 is arranged around the probe seat 31. Multiple air floats 238 are installed on the limiting frames 236 and are positioned opposite to the outer circumferential surface of the probe seat 31, thereby forming multi-position and multi-directional guidance and limiting support during the lifting and lowering movement of the probe seat 31. During operation, compressed gas enters the central air chamber 2383 through the air supply hole 2382 on the side of the air float 238, and is distributed from the central air chamber 2383 to the pressure equalization groove 2384. Since the air float 238 has crisscrossing pressure equalization grooves 2384 on the side facing the probe seat 31, the gas can diffuse relatively evenly on the working surface between the air float 238 and the probe seat 31 to form a stable air film gap, so that the probe seat 31 and the air float 238 can achieve air float guidance in a non-direct hard contact state. With the above structure, the frictional resistance of the probe holder 31 when it moves along the Z-axis is significantly reduced, which can reduce the frictional fluctuations, creeping and local wear problems that are prone to occur in traditional sliding guide structures.

[0042] Meanwhile, the ball-head adjusting component 237 on the limiting frame 236, through its hemispherical support portion 2371, engages with the hemispherical groove 2381 on the back side of the air float 238, forming a spherical support relationship. This allows the air float 238 to make slight angular adjustments relative to the limiting frame 236. Therefore, even with assembly errors, probe seat 31 shape errors, movement deviations, or force changes, the air float 238 can undergo a small range of self-adjustment to improve the relative fit between the air float 238's working surface and the probe seat 31, resulting in a more uniform distribution of the air film gap and preventing instability caused by excessively small local gaps or localized rigid pressure. The multiple elastic grooves 2372 located near the end of the hemispherical support portion 2371 on the ball-head adjusting component 237 can form localized elastic deformation zones during pressure adjustment, thereby mitigating the rigid pressing effect on the air float 238, reducing hard-top interference and stress concentration, and improving the fault tolerance and stability of the air float 238's installation and adjustment.

[0043] The ball head adjustment component 237 can be threadedly connected to the limiting frame 236 so that the contact state between the hemispherical support portion 2371 of the ball head adjustment component 237 and the hemispherical groove 2381 of the air cushion 238 is adjustable.

[0044] In some embodiments, the limiting frame 236 may also be connected to multiple limiting rods. One end of the limiting rod is embedded in the limiting hole on the back side of the air float 238 to provide basic positioning of the air float 238. The limiting rod and the limiting hole may be fitted with a clearance.

[0045] refer to Figure 15-17The workpiece fixture 4 includes a fixture frame 41 detachably connected to the measuring platform 1, a rotary table 42 rotatably connected to the fixture frame 41 via a first rotary shaft 44, a fixture component 43 rotatably connected to the rotary table 42 via a second rotary shaft 45 and used for mounting the workpiece 5 to be measured, a first rotating part 46 connected to the fixture frame 41 and used for driving the rotary table 42 to rotate around the first rotary shaft 44, and a second rotating part 47 connected to the rotary table 42 and used for driving the fixture component 43 to rotate around the second rotary shaft 45; the first rotating part 46 includes a fourth motor, and the second rotating part 47 includes a fifth motor.

[0046] The fixture frame 41 is detachably connected to the measuring platform 1, serving as the mounting base for the workpiece fixture 4, and is easily disassembled and replaced according to the size, shape, or measurement task requirements of the workpiece 5 to be measured. The rotary table 42 is rotatably connected to the fixture frame 41 via the first rotating shaft 44, and can rotate around the first rotating shaft 44 under the drive of the fourth motor, thereby achieving posture adjustment of the workpiece 5 to be measured in the first direction. The fixture component 43 is rotatably connected to the rotary table 42 via the second rotating shaft 45, and can rotate around the second rotating shaft 45 under the drive of the fifth motor, thereby achieving posture adjustment of the workpiece 5 to be measured in another direction. Since the fixture component 43 is used to mount the workpiece 5 to be measured, and the second rotating shaft 45 rotates synchronously with the rotary table 42, the workpiece 5 to be measured can be rotated and adjusted in two degrees of freedom by the individual drive or the coordinated drive of the fourth and fifth motors, so that different surfaces, edges, recessed areas, or inclined areas of the workpiece 5 to be measured are rotated to positions suitable for contact measurement by the probe 32. By setting the dual-axis indexing function on the workpiece fixture 4, the accessibility of the surface to be measured can be improved without increasing the complexity of the joint swing at the probe end, and the probability of measurement dead angles can be reduced.

[0047] The fixture frame 41 includes a first mounting plate 411 detachably connected to the measuring platform 1, and a second mounting plate 412 and a third mounting plate 413 respectively connected to both ends of the first mounting plate 411; The first rotating shaft 44 includes a first shaft segment 441 connected to one end of the rotating table 42 and rotatably connected to the second mounting plate 412, and a second shaft segment 442 connected to the other end of the rotating table 42 and rotatably connected to the third mounting plate 413; The first shaft section 441 extends through the second mounting plate 412 and is connected to the output shaft of the fourth motor via a pulley and a drive belt. The second shaft section 442 extends through the third mounting plate 413, and the end of the extension is connected to the fourth mounting plate 471. The fifth motor is connected to the fourth mounting plate 471, and the output shaft of the fifth motor is connected to the clamp 43 through a pulley and a transmission belt. The third mounting plate 413 has a clearance groove 4131 for avoiding the transmission belt.

[0048] The first mounting plate 411 is detachably connected to the measuring platform 1 and serves as the reference mounting part of the fixture frame 41. The second mounting plate 412 and the third mounting plate 413 are respectively disposed at both ends of the first mounting plate 411 and are used to provide spaced support for both sides of the rotary table 42. The rotary table 42 is integrally formed at both ends to form a first shaft segment 441 and a second shaft segment 442, wherein the first shaft segment 441 is rotatably connected to the second mounting plate 412 and the second shaft segment 442 is rotatably connected to the third mounting plate 413, so that the rotary table 42 can rotate smoothly around the first rotating shaft 44 under the support of both sides. After the fourth motor outputs power, it transmits it to the first shaft segment 441 through pulleys and transmission belts, thereby driving the rotary table 42 to rotate around the first rotating shaft 44, realizing the posture adjustment of the workpiece 5 to be measured in the first direction (the extension direction of the first rotating shaft 44).

[0049] Meanwhile, the second shaft segment 442 passes through the third mounting plate 413 and connects to the fourth mounting plate 471. The fifth motor is mounted on the fourth mounting plate 471 and can rotate synchronously with the rotary table 42. The output shaft of the fifth motor is connected to the fixture 43 through a pulley and a transmission belt, so that the fixture 43 can continue to be driven to rotate around the second rotation axis 45 in any posture after the rotary table 42 is rotated, so as to realize further posture adjustment (rotation) of the workpiece 5 to be measured in the second direction (the extension direction of the second rotation axis 45).

[0050] The clearance groove 4131 provided on the third mounting plate 413 is used to provide clearance space for the corresponding transmission belt, so as to avoid interference between the transmission belt and the third mounting plate 413 during transmission.

[0051] Depending on the size and characteristics of the workpiece 5 to be tested, the fixture 43 can be used to fix the different workpieces 5 to be tested by means of magnetic attraction, clamping or fasteners (such as bolts).

[0052] The five-axis coordinate measuring machine also includes an industrial camera 6 and an industrial control box; The industrial camera 6 is used to acquire continuous frame images of the workpiece 5 under test in order to obtain the posture image information of the workpiece 5 under test. The industrial camera 6, drive frame assembly 2, measuring assembly 3 and workpiece fixture 4 are all electrically connected to the industrial control box. The industrial control box is used to control the drive frame assembly 2 and workpiece fixture 4 to work together according to the posture image information and / or preset path so that the probe 32 can measure the workpiece 5 to be measured.

[0053] In this embodiment, the industrial camera 6 is used to acquire continuous frame images of the workpiece 5 to be measured before and / or during the measurement process, so as to obtain the posture image information of the workpiece 5 in real time or near real time. After the industrial control box is electrically connected to the industrial camera 6, the drive frame assembly 2, the measurement assembly 3 and the workpiece fixture 4, it can receive the posture image information output by the industrial camera 6 and perform coordinated control of the drive frame assembly 2 and the workpiece fixture 4 in combination with the preset measurement path.

[0054] Specifically, the industrial control box can determine whether the current posture of the workpiece 5 meets the preset measurement conditions based on the posture image information. When the posture of the workpiece 5 deviates from the target posture or the surface to be measured is not within the reach range of the probe 32, the workpiece fixture 4 is controlled to adjust its posture, and the drive frame assembly 2 is controlled to drive the probe 32 to correct its position. When the posture of the workpiece 5 meets the measurement conditions, the measurement assembly 3 is controlled to perform contact measurement. Through the high-frequency frame capture of the industrial camera 6 and the linkage control of the industrial control box, the posture changes of the workpiece 5 can be monitored and verified in a timely manner, reducing measurement deviations caused by workpiece clamping deviations, rotation errors, or dynamic posture offsets, and improving the accuracy of the probe 32 in approaching the surface to be measured and the consistency of the measurement path execution.

[0055] Working principle of a five-axis coordinate measuring machine: The five-axis coordinate measuring machine disclosed in this application provides the probe 32 with three linear motion degrees of freedom in the X, Y and Z axes through the drive frame assembly 2, and provides the workpiece 5 to be measured with two rotational degrees of freedom around the first rotation axis 44 and the second rotation axis 45 through the workpiece fixture 4, thereby forming a five-axis composite measurement mode of "three-axis linear motion of probe 32 + two-axis rotation and orientation adjustment of workpiece", so as to realize coordinate measurement of complex curved surfaces, obstructed areas and measurement dead angles.

[0056] In the measurement preparation stage, the workpiece 5 to be measured is first installed on the fixture 43 of the workpiece fixture 4. According to the size, contour and measurement requirements of the workpiece 5, the fixture frame 41 is detachably connected to the corresponding installation position of the measurement platform 1. Subsequently, air is supplied to each air-bearing support / guide part, so that the first air-bearing disk 2221 between the portal slide 222 and the first crossbeam 211, the second air-bearing disk 2231 between the second column 223 and the measurement platform 1, and the third air-bearing disk 2311 between the sleeve 231 and the second crossbeam 221 form an air film gap. At the same time, the probe seat 31 is surrounded by air-bearing pads 238 on multiple limiting frames 236. After air is supplied, the air-bearing pads 238 form a stable air film through the central air cavity 2383 and the pressure equalization groove 2384, which provides air-bearing guidance and limitation for the probe seat 31, thereby reducing the mechanical contact friction between the moving parts and providing a foundation for subsequent smooth movement.

[0057] During the attitude initialization phase, the industrial control box controls the operation of the fourth and fifth motors of the workpiece fixture 4: the fourth motor drives the rotary table 42 to rotate around the first rotation axis 44, and the fifth motor drives the fixture component 43 to rotate around the second rotation axis 45, so as to adjust the workpiece 5 to be measured to the initial measurement attitude. In some embodiments, the industrial camera 6 performs high-frequency continuous frame image acquisition of the workpiece 5 to be measured, and the industrial control box determines whether the current attitude of the workpiece 5 to be measured meets the preset measurement conditions based on the attitude image information; if there is a clamping deviation or rotation deviation, the workpiece fixture 4 is further controlled to perform attitude correction so that the surface to be measured is in a position that is easier for the probe 32 to access.

[0058] During the positioning phase of the probe 32, the first drive assembly 213, the second drive assembly 224, and the third drive assembly 23 work together to position the probe 32 in three-dimensional space. Specifically, the first motor 2131 drives the first rope reel 2133 through the first pulley transmission group 2132. The first rope reel 2133 drives the first rope 2135 to pull the portal slide 222 along the first crossbeam 211, thereby causing the second frame 22 to move along the X-axis. The second motor 2241 drives the third rope reel 2243 through the second pulley transmission group 2242. The third rope reel 2243 drives the second rope 2245 to pull the sleeve 231 along the second crossbeam 221, thereby enabling the measuring assembly 3 to move along the Y-axis. The third motor 232 drives the fifth rope reel 234 on the sleeve 231 through the third pulley transmission group 233, causing the third rope 235 to pull the probe seat 31 up and down along the Z-axis, thereby completing the position adjustment of the probe 32 in the height direction. Because multiple key sliding / supporting parts in the aforementioned kinematic chain employ air-bearing support and air-bearing guide structures, friction fluctuations, creep, and vibration effects can be effectively reduced, improving the stability and repeatability of probe 32 positioning.

[0059] During the contact measurement phase, the industrial control box controls the drive frame assembly 2 and the workpiece fixture 4 to coordinate their movements based on the preset measurement path and / or the posture image information fed back by the industrial camera 6, so that the measuring end of the probe 32 contacts the surface of the workpiece 5 to be measured at a suitable angle. When the measuring end of the contact probe 32 comes into contact with the surface to be measured, it outputs a trigger signal or a displacement response signal, and the system records the spatial coordinate data of the probe 32 at that moment. By continuously acquiring multiple measurement points on the surface of the workpiece 5, point cloud data or discrete coordinate point data can be obtained and used for subsequent geometric feature fitting and dimensional / positional error calculation.

[0060] For workpiece 5 with complex curved surfaces, deep cavities, obstructed areas, or measurement blind spots, the control box can prioritize controlling the workpiece fixture 4 to rotate, bringing the area to be measured into the reachable direction of the probe 32. Then, it controls the drive frame assembly 2 to perform X / Y / Z three-axis positioning and contact measurement. When it is necessary to measure features on another surface or in another direction, the process of "workpiece dual-axis attitude adjustment - probe 32 three-axis positioning - contact sampling" is repeated. By arranging the dual-axis rotation function on the side of the workpiece fixture 4, instead of using a large swing of multiple joints at the probe end to achieve attitude adjustment, the accessibility of the surface to be measured can be improved while keeping the motion chain at the probe end relatively simple. This reduces the error accumulation and end-position fluctuation caused by multi-joint rotation, thereby improving measurement stability and accuracy.

[0061] After the measurement is completed, the industrial control box performs unified processing on the coordinates of each measurement point. For the measurement data obtained after the workpiece fixture 4 is rotated, coordinate transformation or coordinate unification can be performed based on the workpiece posture information corresponding to the first rotation axis 44 and the second rotation axis 45. The measurement points collected under different postures are transformed into the same workpiece coordinate system, thereby completing the comprehensive evaluation of the geometric parameters, contour shape and form and position errors of the workpiece 5 to be measured, and outputting the final measurement results.

[0062] The five-axis coordinate measuring machine disclosed in this application achieves a stable, efficient, and highly accessible coordinate measurement process for complex workpieces through the coordinated operation of air-bearing support / guidance, rope-traction three-axis drive, and workpiece dual-axis indexing and attitude adjustment. It can effectively reduce the stability problems caused by the complex articulation of the probe end and improve measurement repeatability and accuracy.

[0063] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0064] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A five-axis coordinate measuring machine, characterized in that, It includes a frame, a measuring platform disposed on the frame, a drive frame assembly disposed on the measuring platform, a measuring component disposed on the drive frame assembly, and a workpiece fixture disposed on the measuring platform for holding the workpiece to be measured. The drive frame assembly is used to drive the probe of the measuring assembly to move along mutually perpendicular X-axis, Y-axis and Z-axis directions; The measuring assembly includes a probe holder connected to the drive frame assembly and a probe connected to the probe holder. The probe has a measuring end for contacting the surface of the workpiece to be measured, so as to perform coordinate measurement on the workpiece. The workpiece fixture has a first rotating part for driving the workpiece to be tested to rotate around a first rotating axis, and a second rotating part for driving the workpiece to be tested to rotate around a second rotating axis. The first rotating axis is parallel to the X-axis or Y-axis direction, and the second rotating axis is perpendicular to the first rotating axis. The drive frame assembly and the workpiece fixture drive each other so that while the probe moves along the X-axis, Y-axis and Z-axis, the workpiece to be measured is driven to rotate around the first rotation axis and / or the second rotation axis by the workpiece fixture to adjust the posture of the workpiece to be measured, so that the measuring end of the probe contacts the surface to be measured of the workpiece.

2. The five-axis coordinate measuring machine of claim 1, wherein, The drive frame assembly includes a first frame connected to the measurement platform, a second frame slidably connected to the first frame and connected to the measurement component, a first drive component connected to the first frame and used to drive the second frame to move along the length extension direction of the first frame, a second drive component connected to the second frame and used to drive the measurement component to move along the length extension direction of the second frame, and a third drive component connected to the second frame and used to drive the measurement component to move along the Z-axis extension direction. The length of the first frame extends parallel to the X-axis, and the length of the second frame extends parallel to the Y-axis.

3. The five-axis coordinate measuring machine of claim 2, wherein, The first frame includes two first columns connected to the measuring platform and a first crossbeam connected between the two first columns; The second frame includes a second crossbeam, a portal-shaped slide block connected to one end of the second crossbeam and slidingly straddling the first crossbeam, and a second column connected to the other end of the second crossbeam and slidably supported on the measuring platform; The first drive assembly is connected to one end of the first crossbeam and is used to drive the portal slide to move along the length extension direction of the first crossbeam, so as to drive the second frame to move. The second drive component is connected to one end of the second crossbeam and is used to drive the measuring component to move along the length extension direction of the second crossbeam.

4. The five-axis coordinate measuring machine of claim 3, wherein, The first drive assembly includes a first motor connected to the first crossbeam, a first pulley drive group connected to the output shaft of the first motor, and a first rope traction assembly; the first rope traction assembly includes a first rope reel and a second rope reel rotatably connected to the two ends of the first crossbeam, and a first rope wound between the first rope reel and the second rope reel, the first rope being connected to the portal slide, and the first rope reel near the first pulley drive group being drively connected to the first pulley drive group; The second drive assembly includes a second motor connected to the second crossbeam, a second pulley drive group connected to the output shaft of the second motor, and a second rope traction assembly; the second rope traction assembly includes a third rope reel and a fourth rope reel rotatably connected to both ends of the second crossbeam, and a second rope wound between the third rope reel and the fourth rope reel, the second rope being connected to the third drive assembly, the measuring assembly being connected to the third drive assembly, and the third rope reel near the second pulley drive group being drive-connected to the second pulley drive group.

5. The five-axis coordinate measuring machine of claim 4, wherein, The third drive assembly includes a sleeve fitted on and slidably connected to the second crossbeam, a third motor connected to the sleeve, a third pulley drive assembly connected to the output shaft of the third motor, and a third rope traction assembly, wherein the second rope is connected to the sleeve. The probe holder is slidably connected to the sleeve; The third rope traction assembly includes multiple fifth rope reels rotatably connected to the sleeve and a third rope wound between the multiple fifth rope reels. One end of the third rope is connected to the probe seat, and one of the multiple fifth rope reels is connected to the third pulley drive group for transmission, so as to drive the third rope to move under the drive of the third motor, thereby driving the probe seat to move along the Z-axis.

6. The five-axis coordinate measuring machine of claim 5, wherein, The portal slide is connected to a plurality of first air-floating discs for cooperating with the first crossbeam to form air-floating support, the bottom of the second column is connected to a second air-floating disc for cooperating with the measuring platform to form air-floating support, and the sleeve is connected to a plurality of third air-floating discs for cooperating with the second crossbeam to form air-floating support.

7. The five-axis coordinate measuring machine according to claim 5, characterized in that, The sleeve is connected to multiple limiting frames along the Z-axis. The limiting frames are arranged around the probe base. The limiting frames are connected to multiple air-floating pads for cooperating with the probe base to form air-floating guidance and limiting. The air float has crisscrossing pressure equalization grooves on one side facing the probe base, and a central air chamber communicating with the pressure equalization grooves is provided inside the air float. An air supply hole communicating with the central air chamber is opened on the side of the air float. The limiting frame is connected to a ball head adjusting component. One end of the ball head adjusting component is provided with a hemispherical support part. The side of the air float away from the pressure equalization groove is provided with a hemispherical groove that cooperates with the hemispherical support part. The ball head adjusting component has multiple elastic grooves at its end near the hemispherical support.

8. The five-axis coordinate measuring machine according to claim 1, characterized in that, The workpiece fixture includes a fixture frame detachably connected to the measuring platform, a rotary table rotatably connected to the fixture frame via a first rotary axis, a fixture component rotatably connected to the rotary table via a second rotary axis and used for mounting the workpiece to be measured, a first rotating part connected to the fixture frame and used for driving the rotary table to rotate around the first rotary axis, and a second rotating part connected to the rotary table and used for driving the fixture component to rotate around the second rotary axis; the first rotating part includes a fourth motor, and the second rotating part includes a fifth motor.

9. The five-axis coordinate measuring machine of claim 8, wherein, The fixture frame includes a first mounting plate detachably connected to the measuring platform, and a second mounting plate and a third mounting plate respectively connected to both ends of the first mounting plate; The first rotating shaft includes a first shaft segment connected to one end of the rotating table and rotatably connected to the second mounting plate, and a second shaft segment connected to the other end of the rotating table and rotatably connected to the third mounting plate; The first shaft segment extends through the second mounting plate and is connected to the output shaft of the fourth motor via a pulley and a drive belt. The second shaft segment extends through the third mounting plate, and the end of the shaft is connected to a fourth mounting plate. The fifth motor is connected to the fourth mounting plate, and the output shaft of the fifth motor is connected to the clamping component via a pulley and a transmission belt. The third mounting plate has a clearance groove for avoiding the transmission belt.

10. The five-axis coordinate measuring machine of claim 1, wherein, The five-axis coordinate measuring machine also includes an industrial camera and an industrial control box; The industrial camera is used to acquire continuous frame images of the workpiece under test in order to obtain the posture image information of the workpiece under test. The industrial camera, the drive frame assembly, the measuring assembly, and the workpiece fixture are all electrically connected to the industrial control box. The industrial control box is used to control the drive frame assembly and the workpiece fixture to move in coordination according to the posture image information and / or a preset path, so that the probe can measure the workpiece to be measured.

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