Optical axis friction transmission jacking structure of three-coordinate measuring machine

Abstract

This utility model discloses a friction drive clamping structure for a coordinate measuring machine (CMM), comprising a movable slide, a threaded setter, a sliding seat, a clamping wheel seat, a long pin, multiple short pins, multiple clamping wheels, an optical shaft, a drive friction wheel, and a fixed guide rail. By adjusting the threaded setter, a disc spring applies a constant force to the sliding seat, which in turn applies a constant clamping force to the optical shaft through the clamping wheels, thus counteracting the pressure of the drive friction wheel on the optical shaft and ensuring stable friction transmission between the optical shaft and the drive friction wheel. This clamping structure can automatically adjust for changes in the relative position between the optical shaft and the movable slide caused by machining errors or assembly errors, ensuring smooth operation of the CMM and improving measurement accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of coordinate measuring machine manufacturing technology, specifically relating to a coordinate measuring machine optical axis friction transmission clamping structure. Background Technology

[0002] Traditional coordinate measuring machines (CMMs) typically employ transmission methods such as synchronous belt drives, rack and pinion drives, friction wheel belt drives, and friction wheel shaft drives. Each method offers advantages and disadvantages in terms of measurement accuracy. While synchronous belt drives are simple in structure, the elasticity of the belt causes vibration during transmission, affecting accuracy. Rack and pinion drives are stable, but backlash during transmission causes vibration, also impacting accuracy. Friction wheel belt drives and friction wheel shaft drives are slightly more complex than other methods, but once properly tuned, they offer smooth operation with minimal impact on accuracy. However, most CMMs use a single clamping wheel for the friction wheel shaft clamping mechanism, resulting in limited adjustment range and methods, and making tuning difficult. Some clamping wheels use springs as the force-applying structure, leading to inconsistent force and insufficient clamping force, causing slippage and affecting CMM accuracy. Therefore, a new type of friction wheel shaft clamping structure is urgently needed to meet the demands of high-precision measurement. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a friction drive clamping structure for a coordinate measuring machine (CMM). This structure adjusts the threaded set screw to apply a constant force from the disc spring to the sliding seat, which in turn applies a constant clamping force to the optical shaft via a clamping wheel. This counteracts the pressure of the driving friction wheel on the optical shaft, ensuring stable frictional transmission between the optical shaft and the driving friction wheel. This clamping structure automatically adjusts for changes in the relative position between the optical shaft and the moving carriage caused by machining or assembly errors, ensuring smooth operation of the CMM and improving measurement accuracy.

[0004] To solve the technical problem, the technical solution of this utility model is as follows:

[0005] A three - coordinate measuring machine optical axis friction drive and clamping structure, comprising a moving carriage, a threaded set screw, a sliding seat, a clamping wheel seat, a long pin shaft, a plurality of short pin shafts, a plurality of clamping wheels, an optical axis, a driving friction wheel and a fixed guide rail; the moving carriage includes an X - axis frame and a Z - axis frame integrally formed and perpendicular to each other. The optical axis is arranged on the fixed guide rail along the Y - axis direction. A driving friction wheel is provided on one side of the optical axis, and the optical axis is in rolling friction connection with the driving friction wheel. The driving friction wheel is fixedly installed on the X - axis frame of the moving carriage. On the other side of the optical axis, a plurality of clamping wheels are arranged along the Y - axis direction, and the optical axis is in rolling friction connection with the clamping wheels; the plurality of clamping wheels are fixedly arranged on the clamping wheel seat through a plurality of short pin shafts. The clamping wheel seat is a "C" - shaped structure with an opening to the right, and the clamping wheels are arranged at both ends of the clamping wheel seat with an opening to the right; on the upper and lower parts of the clamping wheel seat near the closed end, first shaft holes on the same axis are opened. The clamping wheel seat is arranged in a sliding seat with a "C" - shaped opening to the right. Second shaft holes corresponding to the first shaft holes of the clamping wheel seat and on the same axis are opened on the upper and lower parts of the sliding seat. The long pin shaft sequentially passes through the second shaft hole opened above the sliding seat, the first shaft hole opened above the clamping wheel seat, the first shaft hole opened below the clamping wheel seat and the second shaft hole opened below the sliding seat. A cylindrical end head integrally formed with it is provided at the closed end of the "C" - shaped sliding seat, and the cylindrical end head is installed in a sliding seat hole opened on the Z - axis frame of the moving carriage and adapted to the cylindrical end head. A threaded hole is provided on one side of the sliding seat hole on the Z - axis frame of the moving carriage away from the cylindrical end head, and a threaded set screw is installed in the threaded hole. A disc spring is installed between the threaded set screw and the cylindrical end head provided on the sliding seat.

[0006] Preferably, a second upper boss is provided on the top of the "C" - shaped sliding seat, and a second lower boss is provided on the bottom of the sliding seat. Corresponding second shaft holes are opened on the second upper boss and the second lower boss. A first snap - ring groove is further provided around the second shaft hole on the second lower boss, and a snap - ring is installed in the first snap - ring groove. The snap - ring is used to fix the long pin shaft; the clamping wheel seat can rotate around the long pin shaft.

[0007] Preferably, a first upper boss is provided on the top of the "C" - shaped clamping wheel seat, and a first lower boss is provided on the bottom of the clamping wheel seat. Corresponding third shaft holes are opened on both sides of the first upper boss near the open end of the clamping wheel seat and on both sides of the first lower boss near the open end of the clamping wheel seat. The third shaft holes are arranged on one side close to the open end of the clamping wheel seat, and the first shaft hole on the clamping wheel seat is arranged on one side close to the closed end of the clamping wheel seat. Short pin shafts are installed between the corresponding third shaft holes on the first upper boss and the first lower boss. Two clamping wheels are sleeved on the short pin shafts and can roll around the short pin shafts. A second snap - ring groove is further provided around the third shaft hole on the first upper boss, and a snap - ring is installed in the second snap - ring groove. The snap - ring is used to fix the short pin shaft.

[0008] Preferably, the clamping wheel is disposed between the first upper boss and the first lower boss of the clamping wheel seat; the central axis of the sliding seat hole is located between the second upper boss and the second lower boss and between the first upper boss and the first lower boss; the central axis of the sliding seat hole is perpendicular to the central axis of the optical axis.

[0009] Preferably, the top clamping wheel seat and the sliding seat, viewed from a top view perpendicular to the optical axis, are a combination of a large isosceles trapezoid, a rectangle, and a small isosceles trapezoid. The lower base of the large isosceles trapezoid is the length of the rectangle, and the length of the rectangle is the upper base of the small isosceles trapezoid. A third shaft hole is provided in the combination of the rectangle and the small isosceles trapezoid, and a first shaft hole is provided in the shape of the large isosceles trapezoid. The first shaft hole is located on the common center line of the upper and lower bases of the large isosceles trapezoid. The length of the lower base of the large isosceles trapezoid is greater than the length of the upper base, and the length of the upper base of the small isosceles trapezoid is greater than the length of the lower base.

[0010] Preferably, the area of ​​the top view shape of the top clamping wheel seat is larger than the area of ​​the sliding seat shape.

[0011] Preferably, the distance between the second upper boss and the second lower boss on the sliding seat is greater than the distance between the first upper boss and the first lower boss on the top clamping wheel seat.

[0012] Preferably, there are two clamping wheels, each with a bearing hole, and a pair of double angular contact bearings are installed in the bearing hole.

[0013] Preferably, both ends of the optical axis are fixedly mounted on the fixed guide rail via optical axis mounting seats; the drive friction wheel is mounted on the X-axis frame of the movable carriage via bearing seats; and tapered roller bearings are provided inside the bearing seats.

[0014] Preferably, the cylindrical end of the sliding seat is provided with a stepped hole that matches the disc spring, and the cylindrical end of the sliding seat can rotate radially within the sliding seat hole of the Z-axis frame of the movable carriage.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] (1) The optical axis friction transmission clamping structure of the coordinate measuring machine of this utility model can automatically adjust the changes in the relative position between the optical axis and the moving slide caused by machining errors or assembly errors, thereby improving the assembly accuracy;

[0017] (2) The optical axis friction transmission clamping structure of the coordinate measuring machine of this utility model is easy to install, making it more convenient, faster and more time-saving and labor-saving for assembly personnel during the assembly process;

[0018] (3) The optical shaft friction transmission clamping structure of the coordinate measuring machine of this utility model uses a disc spring to apply clamping force. When the optical shaft is slightly deformed or twisted, the optical shaft will generate a counter-thrust force on the clamping wheel. When the counter-thrust force is transmitted to the disc spring through the clamping wheel seat and the sliding seat, the counter-thrust force will be absorbed by the disc spring and will not be transmitted to the moving slide. This avoids the moving slide from deforming or vibrating due to force, thereby ensuring the smooth operation of the coordinate measuring machine and improving the measurement accuracy of the coordinate measuring machine.

[0019] (4) The optical axis friction transmission clamping structure of the coordinate measuring machine of this utility model adopts a double clamping wheel structure, which increases the guiding ability of the clamping wheel, makes the movement direction of the clamping wheel more consistent with the axial direction of the optical axis, reduces the influence of the clamping wheel on the transmission, and thus improves the accuracy of the coordinate measuring machine. Attached Figure Description

[0020] Figure 1 A schematic diagram of the optical axis friction drive clamping structure of a coordinate measuring machine according to this utility model;

[0021] Figure 2 A top view of a three-coordinate measuring machine optical axis friction transmission clamping structure according to this utility model;

[0022] Figure 3 This utility model discloses a schematic diagram of an optical axis friction transmission clamping structure for a coordinate measuring machine that automatically adjusts its vertical floating position to adapt to the optical axis displacement.

[0023] Figure 4 This utility model relates to a three-coordinate measuring machine optical axis friction drive clamping structure. The clamping structure automatically adjusts its rotation to adapt to the rotation of the optical axis during optical axis rotation.

[0024] Figure label:

[0025] 1-Moving carriage; 101-X-axis bracket; 102-Z-axis bracket; 1021-Sliding seat hole; 2-Threaded set screw; 3-Disc spring; 4-Sliding seat; 401-Second shaft hole; 402-Cylindrical end; 404-Second upper boss; 405-Second lower boss; 5-Tightening wheel seat; 501-First upper boss; 502-First lower boss; 503-First shaft hole; 504-Third shaft hole; 6-Long pin; 7-Short pin; 8-Snap ring; 8-1-First snap ring 8-2-Second snap ring groove; 9-Paired double angular contact bearings; 9-1-First pair of double angular contact bearings; 9-2-First pair of double angular contact bearings; 10-Tightening wheel; 10-1-First tightening wheel; 10-2-Second tightening wheel; 11-Optical shaft; 12-Drive friction wheel; 13-Fixed guide rail; 14-Optical shaft mounting seat; 14-1-First optical shaft mounting seat; 14-2-Second optical shaft mounting seat; 15-Bearing seat; 16-Tap roller bearing. Detailed Implementation

[0026] The specific embodiments of this utility model are described below with reference to examples:

[0027] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0028] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0029] Example 1:

[0030] like Figure 1 and Figure 2As shown in the figure, a three-coordinate measuring machine optical axis friction drive tightening structure includes a moving carriage 1, a threaded set screw 2, a sliding seat 4, a tightening wheel seat 5, a long pin shaft 6, multiple short pin shafts 7, multiple tightening wheels 10, an optical axis 11, a driving friction wheel 12, and a fixed guide rail 13; the moving carriage 1 includes an X-axis frame 101 and a Z-axis frame 102 that are integrally formed and perpendicular to each other. The optical axis 11 is arranged on the fixed guide rail 13 along the Y-axis direction. A driving friction wheel 12 is provided on one side of the optical axis 11. The optical axis 11 is in rolling friction connection with the driving friction wheel 12. The driving friction wheel 12 is fixedly installed on the X-axis frame 101 of the moving carriage 1. Multiple tightening wheels 10 are provided on the other side of the optical axis 11 along the Y-axis direction. The optical axis 11 is in rolling friction connection with the tightening wheels 10; multiple of the tightening wheels 10 are fixedly arranged on the tightening wheel seat 5 through multiple short pin shafts 7. The tightening wheel seat 5 is a "C"-shaped structure with an opening to the right. The tightening wheels 10 are arranged at the two ends of the tightening wheel seat 5 with an opening to the right; at the upper and lower parts of the tightening wheel seat 5 near the closed end, first shaft holes 503 on the same axis are opened. The tightening wheel seat 5 is arranged in a sliding seat 4 with a "C"-shaped opening to the right. Second shaft holes 401 corresponding to the first shaft holes 503 of the tightening wheel seat 5 and on the same axis are opened at the upper and lower parts of the sliding seat 4. The long pin shaft 6 sequentially passes through the second shaft hole 401 opened above the sliding seat 4, the first shaft hole 503 opened above the tightening wheel seat 5, the first shaft hole 503 opened below the tightening wheel seat 5, and the second shaft hole 401 opened below the sliding seat 4. A cylindrical end 402 integrally formed with it is provided at the closed end of the "C"-shaped sliding seat 4. The cylindrical end 402 is installed in a sliding seat hole 1021 opened on the Z-axis frame 102 of the moving carriage 1 and adapted to the cylindrical end 402. A threaded hole is provided on one side of the sliding seat hole 1021 of the Z-axis frame 102 of the moving carriage 1 away from the cylindrical end 402. A threaded set screw 2 is installed in the threaded hole. A disc spring 3 is installed between the threaded set screw 2 and the cylindrical end 402 provided on the sliding seat 4.

[0031] The optical axis 11 is inside the moving carriage 1 that forms an X-axis frame 101 and a Z-axis frame 102 perpendicular to each other.

[0032] Preferably, a second upper convex platform 404 is provided at the top of the "C"-shaped sliding seat 4, and a second lower convex platform 405 is provided at the bottom of the sliding seat 4. Corresponding second shaft holes 401 are opened in both the second upper convex platform 404 and the second lower convex platform 405. A first snap ring groove 8-1 is further provided around the second shaft hole 401 of the second lower convex platform 405. A snap ring 8 is installed in the first snap ring groove. The snap ring 8 is used to fix the long pin shaft 6; the tightening wheel seat 5 can rotate around the long pin shaft 6.

[0033] Preferably, a first upper boss 501 is provided on the top of the "C"-shaped top pressing wheel seat 5, and a first lower boss 502 is provided at the bottom of the top pressing wheel seat 5. Corresponding third shaft holes 504 are formed on both sides of the first upper boss 501 close to the opening end of the top pressing wheel seat 5 and both sides of the first lower boss 502 close to the opening end of the top pressing wheel seat 5. The third shaft holes 504 are arranged on one side close to the opening end of the top pressing wheel seat 5, and the first shaft hole 503 on the top pressing wheel seat 5 is arranged on one side close to the closed end of the top pressing wheel seat 5. A short pin shaft 7 is installed between the corresponding third shaft holes 504 of the first upper boss 501 and the first lower boss 502. Two top pressing wheels 10 are sleeved on the short pin shaft 7 and can roll around the short pin shaft 7. A second snap ring groove 8-2 is further provided around the third shaft hole 504 provided on the first upper boss 501, and a snap ring 8 is installed in the second snap ring groove. The snap ring 8 is used to fix the short pin shaft 7.

[0034] Preferably, the top pressing wheel 10 is arranged between the first upper boss 501 and the first lower boss 502 of the top pressing wheel seat 5; the central axis of the sliding seat hole 1021 is located in the middle of the second upper boss 404 and the second lower boss 405 and in the middle of the first upper boss 501 and the first lower boss 502; the central axis of the sliding seat hole 1021 is perpendicular to the central axis of the optical axis 11.

[0035] Two top pressing wheels 10 are arranged in sequence along the axial direction of the optical axis between the first upper boss 501 and the first lower boss 502. The two top pressing wheels 10 include a first top pressing wheel 10-1 and a second top pressing wheel 10-2, and the first top pressing wheel 10-1 and the second top pressing wheel 10-2 are arranged in sequence along the axial direction of the optical axis between the first upper boss 501 and the first lower boss 502.

[0036] Preferably, the shapes of the top pressing wheel seat 5 and the sliding seat 4 in the top view along the direction perpendicular to the optical axis 11 are a combined shape of a large isosceles trapezoid, a rectangle, and a small isosceles trapezoid in sequence. The lower base of the large isosceles trapezoid is the length of the rectangle, the length of the rectangle is the upper base of the small isosceles trapezoid, and the third shaft hole 504 is provided in the combined shape of the rectangle and the small isosceles trapezoid. The first shaft hole 503 is provided in the shape of the large isosceles trapezoid; the first shaft hole 503 is located on the common center line of the upper base and the lower base of the large isosceles trapezoid; the length of the lower base of the large isosceles trapezoid is greater than the length of the upper base, and the length of the upper base of the small isosceles trapezoid is greater than the length of the lower base.

[0037] Preferably, the area of the shape of the top pressing wheel seat 5 in the top view is larger than the area of the shape of the sliding seat 4.

[0038] Preferably, the distance between the second upper boss 404 and the second lower boss 405 provided on the sliding seat 4 is greater than the distance between the first upper boss 501 and the first lower boss 502 provided on the top pressing wheel seat 5.

[0039] Preferably, there are two tensioning wheels 10, each tensioning wheel 10 having a bearing hole, and a pair of double angular contact bearings 9 are installed in the bearing hole. The double angular contact bearings 9 include a first pair of double angular contact bearings 9-1 and a second pair of double angular contact bearings 9-2. The first pair of double angular contact bearings 9-1 is installed in the bearing hole of the first tensioning wheel 10-1, and the second pair of double angular contact bearings 9-2 is installed in the bearing hole of the second tensioning wheel 10-2.

[0040] Preferably, both ends of the optical axis 11 are fixedly mounted on the fixed guide rail 13 via optical axis mounting seats 14; the drive friction wheel 12 is mounted on the X-axis frame 101 of the movable slide 1 via bearing seats 15; tapered roller bearings 16 are provided inside the bearing seats 15. The bearing seats 15 contain two pairs of tapered roller bearings 16 facing each other at the top and two pairs of tapered roller bearings 16 facing each other at the bottom. The optical axis mounting seats 14 include a first optical axis mounting seat 14-1 and a second optical axis mounting seat 14-2. One end of the optical axis 11 is mounted on one end of the fixed guide rail via the first optical axis mounting seat 14-1, and the other end of the optical axis 11 is mounted on the other end of the fixed guide rail via the second optical axis mounting seat 14-2.

[0041] Preferably, the cylindrical end 402 of the sliding seat 4 is provided with a stepped hole that matches the disc spring 3, and the cylindrical end of the sliding seat 4 can rotate radially within the sliding seat hole 1021 of the Z-axis frame 102 of the movable slide 1.

[0042] The working principle of this utility model:

[0043] The optical axis friction drive mainly relies on the rotation of the driving friction wheel to provide power to the moving carriage by friction. However, in order to generate friction, the driving friction wheel will put pressure on the optical axis. When the optical axis is subjected to pressure, it will deform, which will cause the optical axis to move away from the driving friction wheel, and the driving friction wheel will slip. Therefore, the optical axis friction drive needs a clamping mechanism to clamp the optical axis.

[0044] This utility model discloses a friction drive clamping structure for a coordinate measuring machine's optical axis. By adjusting the threaded set screw, a disc spring applies a constant force to the sliding seat, which in turn applies a constant clamping force to the optical axis via a clamping wheel. This counteracts the pressure exerted on the optical axis by the driving friction wheel. Since the force released by the disc spring within a certain deformation range is a constant clamping force, even slight changes or torsion of the optical axis will result in a constant force on the optical axis that counteracts the pressure exerted on the optical axis by the driving friction wheel. Figure 3 As shown, if the relative position between the optical axis and the moving carriage changes vertically due to machining or assembly errors, the clamping wheel seat will extend the long pin shaft and move it up and down axially to adapt to the change in the optical axis position. Figure 4As shown, if the relative position between the optical axis and the moving carriage changes due to machining errors or assembly errors, the clamping mechanism will extend the radial rotation of the long pin or the cylindrical end of the sliding seat to adapt to the change in optical axis torsion.

[0045] In summary, the optical axis friction transmission clamping structure of this coordinate measuring machine can automatically adjust for changes in the relative position between the optical axis and the moving carriage caused by machining or assembly errors. This invention uses a disc spring to apply clamping force. When the optical axis slightly deforms or twists, it generates a counter-force on the clamping wheel. This counter-force is absorbed by the disc spring after passing through the clamping wheel seat and sliding seat, preventing it from being transmitted to the moving carriage. This avoids deformation or vibration of the moving carriage due to stress, thus ensuring smooth operation of the coordinate measuring machine and improving its measurement accuracy. The clamping structure uses a double clamping wheel structure, increasing the guiding ability of the clamping wheels and better aligning their movement direction with the optical axis's axis. This reduces the impact of the clamping wheels on the transmission, thereby improving the accuracy of the coordinate measuring machine. Furthermore, it is easy to install, making assembly more convenient, faster, and more time-saving for personnel.

[0046] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0047] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A three-coordinate measuring machine optical axis friction drive jacking structure, characterized in that, It includes a moving carriage (1), a threaded set screw (2), a sliding seat (4), a tightening wheel seat (5), a long pin shaft (6), multiple short pin shafts (7), multiple tightening wheels (10), a smooth shaft (11), a driving friction wheel (12) and a fixed guide rail (13); the moving carriage (1) includes an integrally formed X-axis frame (101) and a Z-axis frame (102) that are perpendicular to each other. The smooth shaft (11) is arranged on the fixed guide rail (13) along the Y-axis direction. A driving friction wheel (12) is provided on one side of the smooth shaft (11). The smooth shaft (11) is in rolling friction connection with the driving friction wheel (12). The driving friction wheel (12) is fixedly installed on the X-axis frame (101) of the moving carriage (1). Multiple tightening wheels (10) are provided along the Y-axis direction on the other side of the smooth shaft (11). The smooth shaft (11) is in rolling friction connection with the tightening wheels (10); multiple of the tightening wheels (10) are fixedly arranged on the tightening wheel seat (5) through multiple short pin shafts (7). The tightening wheel seat (5) is a "C"-shaped structure with an opening to the right. The tightening wheels (10) are arranged at the two ends of the tightening wheel seat (5) with an opening to the right; both the upper and lower parts of the tightening wheel seat (5) near the closed end are provided with first shaft holes (503) on the same axis. The tightening wheel seat (5) is arranged in a sliding seat (4) with a "C"-shaped structure with an opening to the right. Both the upper and lower parts of the sliding seat (4) are provided with second shaft holes (401) corresponding to the first shaft holes (503) of the tightening wheel seat (5) on the same axis. The long pin shaft (6) sequentially passes through the second shaft hole (401) opened above the sliding seat (4), the first shaft hole (503) opened above the tightening wheel seat (5), the first shaft hole (503) opened below the tightening wheel seat (5) and the second shaft hole (401) opened below the sliding seat (4). The closed end of the "C"-shaped sliding seat (4) is provided with a cylindrical end head (402) integrally formed with it. The cylindrical end head (402) is installed in a sliding seat hole (1021) opened on the Z-axis frame (102) of the moving carriage (1) and adapted to the cylindrical end head (402). A threaded hole is provided on one side of the sliding seat hole (1021) of the Z-axis frame (102) of the moving carriage (1) away from the cylindrical end head (402). A threaded set screw (2) is installed in the threaded hole. A disc spring (3) is installed between the threaded set screw (2) and the cylindrical end head (402) provided on the sliding seat (4).

2. The optical shaft friction drive tensioning structure of a coordinate measuring machine according to claim 1, wherein, The top of the "C"-shaped sliding seat (4) is provided with a second upper convex platform (404), and the bottom of the sliding seat (4) is provided with a second lower convex platform (405). Corresponding second shaft holes (401) are opened on both the second upper convex platform (404) and the second lower convex platform (405). A first snap ring groove (8-1) is further provided around the second shaft hole (401) on the second lower convex platform (405). A snap ring (8) is installed in the first snap ring groove. The snap ring (8) is used to fix the long pin shaft (6); the tightening wheel seat (5) can rotate around the long pin shaft (6).

3. The optical shaft friction drive top-up structure of a coordinate measuring machine according to claim 1, wherein, The top of the "C"-shaped tightening wheel seat (5) is provided with a first upper boss (501), and the bottom of the tightening wheel seat (5) is provided with a first lower boss (502). Corresponding third shaft holes (504) are opened on both sides of the first upper boss (501) close to the open end of the tightening wheel seat (5) and both sides of the first lower boss (502) close to the open end of the tightening wheel seat (5). The third shaft holes (504) are arranged on one side close to the open end of the tightening wheel seat (5). The first shaft hole (503) on the tightening wheel seat (5) is arranged on one side close to the closed end of the tightening wheel seat (5). A short pin shaft (7) is installed between the corresponding third shaft holes (504) of the first upper boss (501) and the first lower boss (502). Two tightening wheels (10) are sleeved on the short pin shaft (7) and can roll around the short pin shaft (7). A second retaining ring groove (8-2) is further provided around the third shaft hole (504) of the first upper boss (501). A retaining ring (8) is installed in the second retaining ring groove, and the retaining ring (8) is used to fix the short pin shaft (7).

4. The optical axis friction transmission clamping structure for a coordinate measuring machine according to claim 1, characterized in that, The tightening wheel (10) is arranged between the first upper boss (501) and the first lower boss (502) of the tightening wheel seat (5); the central axis of the sliding seat hole (1021) is located in the middle of the second upper boss (404) and the second lower boss (405) and is also located in the middle of the first upper boss (501) and the first lower boss (502); the central axis of the sliding seat hole (1021) is perpendicular to the central axis of the optical axis (11).

5. The optical shaft friction drive top-up structure of a coordinate measuring machine according to claim 1, wherein The shapes of the top views of the tightening wheel seat (5) and the sliding seat (4) along the direction perpendicular to the optical axis (11) are successively a combined shape of a large isosceles trapezoid, a rectangle, and a small isosceles trapezoid. The lower base of the large isosceles trapezoid is the length of the rectangle, and the length of the rectangle is the upper base of the small isosceles trapezoid. The combined shape of the rectangle and the small isosceles trapezoid is provided with a third shaft hole (504), and the shape of the large isosceles trapezoid is provided with a first shaft hole (503); the first shaft hole (503) is located on the common center line of the upper and lower bases of the large isosceles trapezoid; the length of the lower base of the large isosceles trapezoid is greater than the length of the upper base, and the length of the upper base of the small isosceles trapezoid is greater than the length of the lower base.

6. The optical shaft friction drive top-up structure of a coordinate measuring machine according to claim 1, wherein The area of the shape of the top view of the tightening wheel seat (5) is larger than the area of the shape of the sliding seat (4).

7. The optical shaft friction drive preloading structure of a coordinate measuring machine according to claim 1, wherein, The distance between the second upper boss (404) and the second lower boss (405) provided on the sliding seat (4) is greater than the distance between the first upper boss (501) and the first lower boss (502) provided on the tightening wheel seat (5).

8. The optical shaft friction drive top tight structure of a coordinate measuring machine according to claim 1, wherein, There are two tightening wheels (10), and each tightening wheel (10) is provided with a bearing hole, and a pair of double-row angular contact bearings (9) are installed in the bearing hole.

9. The optical shaft friction drive top tight structure of a coordinate measuring machine according to claim 1, wherein, Both ends of the optical axis (11) are fixedly arranged on the fixed guide rail (13) through the optical axis mounting seat (14); the driving friction wheel (12) is installed on the X-axis frame (101) of the moving carriage (1) through the bearing seat (15); a tapered roller bearing (16) is arranged in the bearing seat (15).

10. The optical shaft friction drive top-up structure of a coordinate measuring machine according to claim 1, wherein The sliding seat (4) is provided with a cylindrical end (402) provided with a stepped hole matched with the disc spring (3), and the cylindrical end of the sliding seat (4) can rotate radially in the sliding seat hole (1021) of the Z-axis frame (102) of the moving slide (1).

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