Ball screw flexible transmission mechanism and measuring machine

Abstract

This invention provides a flexible ball screw transmission mechanism and a measuring machine. The flexible ball screw transmission mechanism includes a ball screw, a nut, and a crossed roller slide assembly. The crossed roller slide assembly includes a first mounting slide, a second mounting slide, a third mounting slide, and a first and a second crossed roller linear guide rail arranged perpendicularly to each other. The two rails of the first crossed roller linear guide rail are respectively connected to the first and second mounting slides. The two rails of the second crossed roller linear guide rail are respectively connected to the second and third mounting slides. The first mounting slide is fixedly connected to one end face of the nut, and roller bearings are installed on both sides of the bottom of the first mounting slide. A connecting seat is fixedly connected to the third mounting slide. This flexible ball screw transmission mechanism, where the nut and connecting seat are connected by the crossed roller slide assembly, ensures smooth and accurate transmission, improving the measurement accuracy of the measuring machine.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment technology, specifically relating to a ball screw flexible transmission connection device and a measuring machine having the device. Background Technology

[0002] Ball screw drives, a common transmission mechanism in measuring machines (CMMs), play a crucial role in the accuracy of CMMs. Taking the measuring platform of a CMM as an example, the fixed platform and the moving platform are connected by a ball screw drive mechanism. Specifically, the bearing seats at both ends of the ball screw drive mechanism are fixed to the fixed platform, and the moving platform is fixed to the connecting seat of the ball screw drive mechanism. The connecting seat is fixedly connected to the lead screw nut, and a precision guiding mechanism (such as an air-bearing guide rail) is set between the moving platform and the fixed platform for guidance and positioning. The lead screw rotates under the action of an external drive mechanism, and the lead screw nut moves linearly along the lead screw, thus driving the moving platform of the measuring machine to move linearly along the lead screw axis through the connecting seat.

[0003] Although using high-precision ball screws can improve the transmission accuracy of measuring machines, the accuracy of the ball screw itself is only one of the factors affecting the accuracy of the measuring machine. The deflection or radial runout of the screw will affect the transmission accuracy, and thus affect the motion stability of the measuring machine's motion platform and the measuring accuracy of the measuring machine.

[0004] Currently, there are two types of connections between the motion platform of a measuring machine and the nut of the ball screw transmission mechanism: rigid connection and flexible connection. A rigid connection requires that the motion platform be perfectly stable in all directions during movement, which necessitates extremely high precision machining of the guiding mechanism and transmission components. Otherwise, the motion platform may jam during movement, increasing manufacturing costs. A flexible connection typically uses a spring plate between the motion platform and the nut. The spring plate counteracts vibrations caused by the elastic deformation of the motion platform during movement. However, because the screw itself has a certain degree of deflection, prolonged reciprocating motion inevitably leads to plastic deformation of the spring plate. Furthermore, the repeated deformation of the spring plate involves energy release, reducing its lifespan and ultimately affecting the stability and measurement accuracy of the measuring machine. Summary of the Invention

[0005] This invention provides a ball screw flexible transmission mechanism and a measuring machine, which can solve the problem in the prior art where the deflection and radial oscillation of the screw affect the transmission accuracy, and thus affect the accuracy of the measuring machine.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the ball screw flexible transmission mechanism proposed in this utility model is a ball screw flexible transmission mechanism, comprising:

[0007] The lead screw is horizontally positioned and its two ends are rotatably connected to two fixed bearing seats respectively.

[0008] A lead screw nut, which cooperates with the lead screw, and when the lead screw rotates, it drives the lead screw nut to move along the axial direction of the lead screw;

[0009] A cross roller slide assembly includes a first mounting slide, a second mounting slide, a third mounting slide, a first cross roller linear guide, and a second cross roller linear guide. The first cross roller linear guide and the second cross roller linear guide are arranged perpendicularly to each other. The two guide rails of the first cross roller linear guide are respectively connected to the first mounting slide and the second mounting slide. The two guide rails of the second cross roller linear guide are respectively connected to the second mounting slide and the third mounting slide. The first mounting slide is fixedly connected to one end face of the lead screw. Roller bearings are installed on both sides of the bottom of the first mounting slide. The rotation axis of the roller bearing is horizontal and perpendicular to the axial direction of the lead screw. The bottom of the outer ring of the roller bearing protrudes downward from the cross roller slide assembly.

[0010] A connecting seat is fixedly connected to the third mounting slide, the connecting seat including a horizontal connecting portion located above the cross roller slide assembly.

[0011] The technical solution of this utility model also includes the following additional technical features:

[0012] The first mounting slide has clearance notches on both sides of its bottom, and the roller bearing is installed in the clearance notches.

[0013] A connecting shaft is fixedly inserted through the bottom of the first mounting slide, and the two roller bearings are respectively rotatably mounted on both ends of the connecting shaft. Bearing retaining rings are provided on both sides of each roller bearing for limiting.

[0014] An anti-rotation plane is formed on the outer circumferential surface of the connecting shaft. A plurality of threaded holes are formed on the bottom side of one side of the first mounting slide. The threaded holes intersect perpendicularly with the through holes of the connecting shaft. An anti-rotation set screw is installed in the threaded hole and abuts against the anti-rotation plane of the connecting shaft.

[0015] The first cross roller linear guide is arranged vertically, and the second cross roller linear guide is arranged horizontally.

[0016] A transition fastener is fixedly connected to the side of the third mounting slide that is opposite to the second mounting slide, and the connecting seat is fixedly connected to the third mounting slide through the transition fastener.

[0017] The connector includes a vertical connecting portion perpendicular to the horizontal connecting portion, the vertical connecting portion being located on the side of the adapter and fixedly connected to the adapter.

[0018] The vertical connecting part is in the shape of an inverted U-shape, and the adapter fixing part is located within the U-shaped space enclosed by the vertical connecting part and is fixedly connected to the two opposite inner walls of the vertical connecting part.

[0019] This utility model also proposes a measuring machine, including a measuring platform. The measuring platform includes a fixed platform, a moving platform horizontally slidably disposed above the fixed platform, and a driving component and transmission mechanism for driving the moving platform to slide horizontally. The transmission mechanism is the aforementioned ball screw flexible transmission mechanism, which is located between the moving platform and the fixed platform. The bearing seat is fixedly disposed on the fixed platform, and the horizontal connecting part of the connecting seat is fixedly connected to the moving platform. The roller bearing is supported on the fixed platform.

[0020] A wear-resistant strip with high flatness is fixed on the fixed platform at the position corresponding to the roller bearing, and the bottom of the outer ring of the roller bearing is in contact with the wear-resistant strip.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] 1. The ball screw flexible transmission mechanism of this utility model is connected between the nut and the connecting seat by a cross roller slide assembly. The first cross roller linear guide rail between the first mounting slide and the second mounting slide of the cross roller slide assembly, and the second cross roller linear guide rail between the second mounting slide and the third mounting slide are arranged perpendicularly to each other, so that the moving part to be transmitted connected to the connecting seat can slide relative to each other on two perpendicular radial directions of the screw. In the process of screw rotation transmission, it can resist the influence of screw deflection or radial swing, ensure transmission smoothness and transmission accuracy, and thus ensure the smooth movement of the moving part to be transmitted.

[0023] 2. Roller bearings are installed on both sides of the bottom of the first mounting slide. The bottom of the outer ring of the roller bearing protrudes downward from the cross roller slide assembly. When the utility model ball screw flexible transmission mechanism is installed in place, the roller bearing can support the first mounting slide, which is also conducive to counteracting the deflection of the screw, ensuring the straightness of the screw transmission process, and thus ensuring the stability and precision of the moving parts connected by the connecting seat.

[0024] 3. The measuring machine of this utility model adopts the ball screw flexible transmission mechanism of this utility model as the transmission mechanism between the fixed platform and the moving platform of the measuring machine. The moving platform is the moving part to be transmitted. Since the ball screw flexible transmission mechanism of this utility model has the above-mentioned technical effects, the measurement accuracy of the measuring machine of this utility model can be improved accordingly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the ball screw flexible transmission mechanism in an embodiment of the present utility model.

[0027] Figure 2 This is a three-dimensional structural schematic diagram of the ball screw flexible transmission mechanism in an embodiment of the present utility model from another perspective;

[0028] Figure 3 This is a three-dimensional structural schematic diagram of the cross roller slide assembly from one perspective in an embodiment of the present utility model.

[0029] Figure 4 This is a three-dimensional structural schematic diagram of the cross roller slide assembly from another perspective in an embodiment of this utility model;

[0030] Figure 5 for Figure 3 A schematic diagram of the decomposed structure;

[0031] Figure 6 for Figure 4 A schematic diagram of the decomposed structure;

[0032] Figure 7 This is an exploded view of the mounting structure of the roller bearing on the first mounting slide in an embodiment of this utility model;

[0033] Figure 8 This is a cross-sectional schematic diagram of the assembly structure of the roller bearing and the first mounting slide in an embodiment of this utility model;

[0034] Figure 9 This is a three-dimensional structural diagram of the connecting shaft in an embodiment of the present utility model;

[0035] Figure 10 This is a three-dimensional structural diagram of the adapter fixing component in an embodiment of this utility model.

[0036] Reference numerals: 100, lead screw; 200, lead screw nut; 300, crossed roller slide assembly; 310, first mounting slide; 311, clearance notch; 312, through hole; 313, threaded hole; 314, countersunk mounting hole; 315, lead screw nut mounting threaded hole; 320, second mounting slide; 330, third mounting slide; 340, first crossed roller linear guide; 350, second crossed roller linear guide; 3 60. Roller bearing; 370. Connecting shaft; 371. Anti-rotation plane; 372. Retaining ring groove; 380. Bearing retaining ring; 390. Anti-rotation set screw; 3100. Through part; 400. Adapter fixing part; 410. Center hole; 420. Countersunk hole; 430. Side threaded hole; 500. Connecting seat; 510. Horizontal connecting part; 520. Vertical connecting part; 600. Bearing housing; 700. Wear-resistant strip. Detailed Implementation

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0039] In some embodiments of this utility model, a measuring machine includes a measuring platform, which includes a fixed platform, a motion platform horizontally slidably disposed above the fixed platform, and a driving component and transmission mechanism for driving the motion platform to slide horizontally.

[0040] The structure of the motion platform, the fixed platform, and the sliding guide mechanism between them can adopt existing technologies, which will not be elaborated here.

[0041] The transmission mechanism is specifically a ball screw flexible transmission mechanism, which is located between the moving platform and the fixed platform, such as... Figure 1 , Figure 2 As shown, the ball screw flexible transmission mechanism includes a screw 100, a nut 200, a cross roller slide assembly 300, and a connecting seat 500.

[0042] The lead screw 100 and lead nut 200 are existing ball screw structures. The lead screw 100 is horizontally arranged and parallel to the fixed platform. Its two ends are rotatably connected to the bearing housing 600, which is fixedly mounted on the fixed platform. One end of the lead screw 100 extends out of the bearing housing 600 to connect to the output end of the drive component (such as a motor), so that the lead screw 100 can rotate under the drive of the drive component.

[0043] The lead screw nut 200 is engaged with the lead screw 100, and the lead screw nut 200 is configured to move only along the axial direction of the lead screw 100 when the lead screw 100 rotates, and not rotate with the lead screw 100.

[0044] The connecting seat 500 connects the cross roller slide assembly 300 and the motion platform. Specifically, the connecting seat 500 has a horizontal connecting portion 510 located above the cross roller slide assembly 300, and the motion platform is connected and fixed to the upper surface of the horizontal connecting portion 510.

[0045] like Figures 3 to 6 As shown, the cross roller slide assembly 300 includes a first mounting slide 310, a second mounting slide 320, and a third mounting slide 330 arranged sequentially along the extension direction of the lead screw 100. It also includes a first cross roller linear guide 340 and a second cross roller linear guide 350. The first cross roller linear guide 340 and the second cross roller linear guide 350 are arranged perpendicular to each other, that is, the guiding direction of the first cross roller linear guide 340 is perpendicular to the guiding direction of the second cross roller linear guide 350. Both the first cross roller linear guide 340 and the second cross roller linear guide 350 are perpendicular to the axial direction of the lead screw 100, that is, parallel to the radial direction of the lead screw 100.

[0046] The first crossed roller linear guide 340 is located between the first mounting slide 310 and the second mounting slide 320, with one of its two guides connected to the first mounting slide 310 and the other connected to the second mounting slide 320; the second crossed roller linear guide 350 is located between the second mounting slide 320 and the third mounting slide 330, with one of its two guides connected to the second mounting slide 320 and the other connected to the third mounting slide 330; the first mounting slide 310 is fixedly connected to one end face of the nut 200 by screws, the third mounting slide 330 is fixedly connected to the connecting seat 500, and the connecting seat 500 is fixedly connected to the motion platform. The second mounting slide 320 can slide relative to the lead screw 100 in the guiding direction of the first cross roller linear guide 340, and the third mounting slide 330 can slide relative to the lead screw 100 in the guiding direction of the second cross roller linear guide 350. This allows the connecting seat 500 to drive the motion platform of the measuring machine to slide relative to the lead screw 100 in two perpendicular radial directions. This can resist the influence of the lead screw 100's own deflection or radial oscillation, ensuring smooth transmission and transmission accuracy, thereby ensuring the smoothness and accuracy of the motion platform and improving the measurement accuracy of the measuring machine.

[0047] When the lead screw 100 rotates under the action of the drive component, the lead nut 200 moves linearly along the lead screw 100. Through the flexible connection of the cross roller slide assembly 300, the motion platform of the measuring machine also moves linearly along the axis of the lead screw 100.

[0048] Roller bearings 360 are installed on both sides of the bottom of the first mounting slide 310. The axis of rotation of the roller bearings 360 is horizontal and perpendicular to the axial direction of the lead screw 100. The bottom of the outer ring of the roller bearing 360 protrudes downward from the bottom surface of the cross roller slide assembly 300, so that the roller bearings 360 are supported on the fixed platform of the measuring machine. The roller bearings 360 can support the first mounting slide 310, which helps to further reduce or even eliminate the deflection deformation of the lead screw 100, ensure the straightness of the lead screw 100 during transmission, and thus ensure the stability and accuracy of the motion platform connected to the connecting seat 500, thereby improving the measurement accuracy of the measuring machine.

[0049] Furthermore, a wear-resistant strip 700 with high flatness is fixed on the fixed platform at the position corresponding to the roller bearing 360. During the rolling process driven by the nut 200 and the cross roller slide assembly 300, the bottom of the outer ring of the roller bearing 360 is always in contact with the wear-resistant strip 700 and supported on the fixed platform to prevent the roller bearing 360 from causing wear to the fixed platform.

[0050] In some embodiments of this utility model, the high flatness wear-resistant strip 700 is a steel strip, but it can also be a composite wear-resistant strip, nylon strip, ceramic strip, etc., and no specific limitation is made here.

[0051] In some embodiments of this utility model, such as Figures 1 to 8 As shown, the first mounting slide 310, the second mounting slide 320, and the third mounting slide 330 are each provided with a through portion 3100. The through portions 3100 of the three slides are coaxially arranged and respectively sleeved on the lead screw 100. There is a certain gap between the through portion 3100 and the lead screw 100. The through portion 3100, the lead screw 100, and the lead screw nut 200 are coaxially arranged. In this way, the cross roller slide assembly 300 can be completely sleeved on the lead screw 100 with a certain gap between them. The cross roller slide assembly 300 can play a certain constraint role on the entire circumference of the lead screw 100, which can reduce or even eliminate the adverse effects of other irregular deformations of the lead screw 100 on the moving parts, ensure the stability of the lead screw 100 transmission process and the smooth movement of the moving parts, thereby improving the measurement accuracy of the measuring machine.

[0052] In some embodiments of this utility model, such as Figure 6 As shown, there are two first crossed roller linear guides 340. These two first crossed roller linear guides 340 are arranged in parallel and symmetrically with respect to the axis of the through portion 3100, thus ensuring that the two first crossed roller linear guides 340 are symmetrically arranged on both sides of the lead screw 100. Figure 1 , Figure 2 and Figure 6 From the view shown, two first crossed roller linear guides 340 are symmetrically arranged on the left and right sides of the lead screw 100. The two guides of each first crossed roller linear guide 340 are respectively connected to the first mounting slide 310 and the second mounting slide 320 by multiple screws arranged along the length of the guide rail.

[0053] In some embodiments of this utility model, such as Figure 6 As shown, there are two second crossed roller linear guides 350. These two second crossed roller linear guides 350 are arranged in parallel and symmetrically with respect to the axis of the through portion 3100, thus ensuring that the two second crossed roller linear guides 350 are symmetrically arranged on both sides of the lead screw 100. Figure 1 , Figure 2 and Figure 6 From the view shown, two second crossed roller linear guides 350 are symmetrically arranged on the upper and lower sides of the lead screw 100. The two guides of each second crossed roller linear guide 350 are respectively connected to the second mounting slide 320 and the third mounting slide 330 by multiple screws arranged along the length of the guide rail.

[0054] By setting two first cross roller linear guides 340 and two second cross roller linear guides 350, and symmetrically arranged relative to the lead screw 100, the first cross roller linear guides 340 and the second cross roller linear guides 350 can be evenly distributed around the circumference of the lead screw 100. This facilitates the balanced reduction of the adverse effects of radial deformation of the lead screw 100 on the movement of the moving parts, further improving the stability of the lead screw 100 transmission process and the smoothness of the movement of the measuring platform.

[0055] In some embodiments of this utility model, the overall outer contour of the cross roller slide assembly 300 is cubic, and the through part 3100 is located on its central axis. The lead screw 100 passes through the cross roller slide assembly 300 along the axial direction of the cross roller slide assembly 300, so that the transmission of the lead screw 100 is more balanced and stable.

[0056] In some embodiments of this utility model, such as Figures 3 to 8 As shown, the bottom of the first mounting slide 310 has clearance notches 311 on both sides, making the bottom of the first mounting slide 310 T-shaped. The roller bearing 360 is installed in the clearance notch 311. This can reduce the increase in height of the cross roller slide assembly 300 caused by the installation of the roller bearing 360, so that the ball screw flexible transmission mechanism in this embodiment of the present invention can be smoothly installed between the fixed platform and the motion platform of the measuring machine.

[0057] like Figure 7 and Figure 8 As shown, the bottom of the first mounting slide 310 has a through hole 312 with its axis perpendicular to and through the axis of the lead screw 100. A connecting shaft 370 passes through the through hole 312 and is fixed, with both ends exposed outside the through hole 312. Two roller bearings 360 are rotatably mounted on both ends of the connecting shaft 370, and the two sides of each roller bearing 360 are restricted by bearing retaining rings 380.

[0058] An anti-rotation plane 371 is formed on the outer peripheral surface of the connecting shaft 370. Multiple (e.g., two) threaded holes 313 are formed on the bottom side of one side of the first mounting slide 310. The threaded holes 313 intersect perpendicularly with the through holes 312. After the connecting shaft 370 is installed in place, multiple anti-rotation set screws 390 are screwed onto the first mounting slide 310 through the threaded holes 313. At the same time, when installing the connecting shaft 370, the anti-rotation plane 371 of the connecting shaft 370 is required to be perpendicular to the anti-rotation set screws 390. When the end face of the anti-rotation set screw 390 abuts against the anti-rotation plane 371, the anti-rotation fixing function of the connecting shaft 370 is realized.

[0059] Preferably, the threaded holes 313 on the first mounting slide 310 are arranged symmetrically, and there are two of them. Correspondingly, the anti-rotation set screws 390 are arranged symmetrically.

[0060] like Figures 7 to 9 As shown, the connecting shaft 370 has a symmetrical structure, with two retaining ring grooves 372 at each end for installing the bearing retaining ring 380, so that the bearing retaining ring 380 can be embedded therein.

[0061] like Figure 3 , Figure 5 and Figure 7 As shown, the first mounting slide 310 is also provided with a recessed mounting hole 314, which is fitted with the annular boss of the nut 200 and the nut 200 is fixed on the nut mounting threaded hole 315 on the first mounting slide 310 by screws.

[0062] In some embodiments of this utility model, the second cross roller linear guide 350 between the third mounting slide 330 and the second mounting slide 320 is arranged horizontally, and the first cross roller linear guide 340 between the first mounting slide 310 and the second mounting slide 320 is arranged vertically. This ensures that the weight pressed on the lead screw 100 by the nut 200 is only the first mounting slide 310, which can further reduce the deformation of the lead screw 100. In addition, with the support of the roller bearing 360, the influence of the nut 200 on the deformation of the lead screw 100 can be further reduced, ensuring that the deformation of the lead screw 100 during movement is minimized, improving the smoothness of the transmission mechanism and improving the measurement accuracy of the measuring machine.

[0063] Furthermore, when the measuring machine's motion platform moves linearly along the lead screw 100 axis, due to fluctuations in the air source of the air-bearing guide rail or certain deformation or oscillation of the lead screw 100 in the radial direction, the first mounting slide 310, the second mounting slide 320, and the third mounting slide 330 can respectively achieve free adjustment in the vertical and horizontal directions, ensuring that the measuring machine's motion platform moves smoothly relative to the lead screw 100 and ensuring the accuracy of the measuring machine.

[0064] In some embodiments of this utility model, such as Figure 2 and Figure 10 As shown, a transition fastener 400 is fixedly connected to the side of the third mounting slide 330 opposite to that of the second mounting slide 320, and the connecting seat 500 is fixedly connected to the third mounting slide 330 through the transition fastener 400.

[0065] The adapter 400 has a central hole 410 through which the lead screw 100 passes. Multiple countersunk holes 420 are provided around the central hole 410 for fixing it to the third mounting slide 330 with screws. The adapter 400 and the connecting seat 500 can also be fixedly connected with screws.

[0066] Furthermore, the connector 500 includes a vertical connector 520 that is perpendicular to the horizontal connector 510, making the connector 500 generally L-shaped. The vertical connector 520 is located below the horizontal connector 510 and is located on the side of the adapter 400 and is fixedly connected to the adapter 400.

[0067] The vertical connecting part 520 is specifically shaped like an inverted U-shape, with the opening facing downwards. The adapter fastener 400 is embedded in the U-shaped space formed by the vertical connecting part 520. The two opposite sides of the adapter fastener 400 are in contact with the two opposite inner walls of the vertical connecting part 520. There are two side threaded holes 430 on the two opposite sides of the adapter fastener 400. The connecting seat 500 can be fixed to the side threaded holes 430 of the connecting fastener 400 by screws, so that the vertical connecting part 520 can contact and connect with the adapter fastener 400 with a larger area, thereby improving the reliability of the connection.

[0068] Preferably, the connector 500 has a left-right symmetrical structure.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A flexible ball screw transmission mechanism, characterized in that, include: The lead screw is horizontally positioned and its two ends are rotatably connected to two fixed bearing seats respectively. A lead screw nut, which cooperates with the lead screw, and when the lead screw rotates, it drives the lead screw nut to move along the axial direction of the lead screw; A cross roller slide assembly includes a first mounting slide, a second mounting slide, a third mounting slide, a first cross roller linear guide, and a second cross roller linear guide. The first cross roller linear guide and the second cross roller linear guide are arranged perpendicularly to each other. The two guide rails of the first cross roller linear guide are respectively connected to the first mounting slide and the second mounting slide. The two guide rails of the second cross roller linear guide are respectively connected to the second mounting slide and the third mounting slide. The first mounting slide is fixedly connected to one end face of the lead screw. Roller bearings are installed on both sides of the bottom of the first mounting slide. The rotation axis of the roller bearing is horizontal and perpendicular to the axial direction of the lead screw. The bottom of the outer ring of the roller bearing protrudes downward from the cross roller slide assembly. A connecting seat is fixedly connected to the third mounting slide, the connecting seat including a horizontal connecting portion located above the cross roller slide assembly.

2. The ball screw flexible transmission mechanism according to claim 1, characterized in that, The first mounting slide has clearance notches on both sides of its bottom, and the roller bearing is installed in the clearance notches.

3. The ball screw flexible transmission mechanism according to claim 1, characterized in that, A connecting shaft is fixedly inserted through the bottom of the first mounting slide, and the two roller bearings are respectively rotatably mounted on both ends of the connecting shaft. Bearing retaining rings are provided on both sides of each roller bearing for limiting.

4. The ball screw flexible transmission mechanism according to claim 3, characterized in that, An anti-rotation plane is formed on the outer circumferential surface of the connecting shaft. A plurality of threaded holes are formed on the bottom side of one side of the first mounting slide. The threaded holes intersect perpendicularly with the through holes of the connecting shaft. An anti-rotation set screw is installed in the threaded hole and abuts against the anti-rotation plane of the connecting shaft.

5. The ball screw flexible transmission mechanism according to claim 1, characterized in that, The first cross roller linear guide is arranged vertically, and the second cross roller linear guide is arranged horizontally.

6. The ball screw flexible transmission mechanism according to claim 1, characterized in that, A transition fastener is fixedly connected to the side of the third mounting slide that is opposite to the second mounting slide, and the connecting seat is fixedly connected to the third mounting slide through the transition fastener.

7. The ball screw flexible transmission mechanism according to claim 6, characterized in that, The connector includes a vertical connecting portion perpendicular to the horizontal connecting portion, the vertical connecting portion being located on the side of the adapter and fixedly connected to the adapter.

8. The ball screw flexible transmission mechanism according to claim 7, characterized in that, The vertical connecting part is in the shape of an inverted U-shape, and the adapter fixing part is located within the U-shaped space enclosed by the vertical connecting part and is fixedly connected to the two opposite inner walls of the vertical connecting part.

9. A measuring machine, comprising a measuring platform, the measuring platform including a fixed platform, a moving platform horizontally slidably disposed above the fixed platform, and a driving component and a transmission mechanism for driving the moving platform to slide horizontally, characterized in that, The transmission mechanism is a ball screw flexible transmission mechanism as described in any one of claims 1 to 8. The ball screw flexible transmission mechanism is located between the motion platform and the fixed platform. The bearing seat is fixedly mounted on the fixed platform. The horizontal connecting part of the connecting seat is fixedly connected to the motion platform. The roller bearing is supported on the fixed platform.

10. The measuring machine according to claim 9, characterized in that, A wear-resistant strip with high flatness is fixed on the fixed platform at the position corresponding to the roller bearing, and the bottom of the outer ring of the roller bearing is in contact with the wear-resistant strip.

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