Rapid alignment device for three-coordinate measuring machine part

Abstract

The invention relates to the field of three-coordinate measuring machines, and discloses a rapid alignment device for parts of a three-coordinate measuring machine, which comprises a base and an alignment mechanism, a base point measuring ball of the measuring instrument is arranged at one vertex angle of the base, and two sides of the vertex angle of the base provided with the base point measuring ball are respectively parallel to the directions of the X axis and the Y axis; a gradienter is arranged on the base; the alignment mechanism comprises a Z-axis displacement change observation mechanism and a workpiece center alignment mechanism which are arranged from bottom to top; the Z-axis displacement change observation mechanism is installed on the base and slides on the base along the vertex angle where the base point measuring ball is located to the opposite angle so as to move in the original X-axis direction and the original Y-axis direction of the measuring instrument. According to the invention, through the Z-axis displacement change observation mechanism, the displacement vector of the to-be-detected workpiece on the Z axis is rapidly detected; the workpiece center alignment mechanism quickly finds out the geometric center of the to-be-measured workpiece, so that the displacement vector of the to-be-measured workpiece relative to the base point coordinate system of the measuring machine is quickly determined, and the purpose of quickly aligning different parts during batch detection of the parts is achieved.

Description

Technical Field

[0001] The present application relates to a rapid alignment device for parts of a three-coordinate measuring machine, and belongs to the field of three-coordinate measuring machines. Background Art

[0002] At present, the method of measuring products with three-dimensional coordinate measuring instruments is to measure single pieces. After measuring one piece, the next piece is manually replaced. At the same time, the same product is turned over during measurement, and then it has to be realigned after turning over. The rough datum needs to be manually established twice for each piece, resulting in low inspection efficiency and cumbersome work for inspectors. In addition, if the workpiece cannot be replaced in time, the three-dimensional coordinate measuring machine will have a long idle time waiting, which will seriously affect the measurement efficiency. Summary of the invention

[0003] In view of this, the present application provides a rapid alignment device for parts of a three-dimensional coordinate measuring machine, so as to achieve the purpose of rapid alignment of different parts when the three-dimensional coordinate measuring machine is used to inspect parts in batches. The specific scheme is as follows: A rapid alignment device for parts of a three-dimensional coordinate measuring machine, the device comprising a base and an alignment mechanism arranged on the base; A base point measuring ball of the measuring instrument is installed at one vertex of the base, two sides of the vertex of the base on which the base point measuring ball is installed are respectively parallel to the original X-axis and Y-axis of the measuring instrument, and a level is arranged on the base; The alignment mechanism includes a Z-axis displacement change observation mechanism and a workpiece center alignment mechanism arranged from bottom to top; The workpiece center alignment mechanism is installed on the top of the Z-axis displacement change observation mechanism and is used to align the geometric center of the workpiece to be measured; The Z-axis displacement change observation mechanism is used to adjust the displacement of the alignment mechanism on the Z-axis. The Z-axis displacement change observation mechanism is installed on the base and slides diagonally on the base along the top angle where the base point measuring ball is located to achieve movement along the original X-axis and Y-axis directions of the measuring instrument.

[0004] Preferably, the base is a regular quadrilateral plate, a first slide rail is provided on the base, and level adjustment mechanisms are respectively provided at the four corners of the base; The first slide rail is arranged in a diagonal direction along the top angle of the base where the base point measuring ball is installed, and a scale is arranged on the first slide rail; The Z-axis displacement change observation mechanism is movably connected in the first slide rail; The level is installed on one side of the first slide rail, and the level is fixed on the top of the base.

[0005] Preferably, the Z-axis displacement change observation mechanism comprises a first rod and a second rod arranged in sequence from bottom to top; The first rod is a hollow rod, and the bottom of the first rod is slidably connected to the first slide rail; One end of the second rod is inserted into the first rod and is slidably connected to the first rod, and the other end of the second rod is fixedly connected to a workpiece center alignment mechanism.

[0006] Preferably, a Z-axis displacement change observation mechanism is provided between the first rod and the second rod; The Z-axis displacement change observation mechanism includes a connecting hole provided at an end of the first rod near the second rod, a rotating shaft arranged in the connecting hole, and a rack arranged at one end of the second rod near the first rod; The rotating shaft passes through the connecting hole, and the two ends of the rotating shaft are respectively located at the inner and outer sides of the first rod, and the circumference of the end of the rotating shaft located inside the first rod is provided with teeth, and the end of the rotating shaft located outside the first rod is fixedly connected with a dial; The rack is arranged along the extension direction of the second rod and is installed on the second rod, and the rack is meshed with the teeth.

[0007] Preferably, the workpiece center alignment mechanism includes a base plate; The bottom plate is installed on the top of the second rod, the bottom plate is a hollow regular quadrilateral plate, a first center positioning plate is arranged on the inner side of the bottom plate, and a second center positioning plate and a plurality of fixing plates are arranged on the outer side of the bottom plate; The first center positioning disk is located directly below the second center positioning disk. The first center positioning disk and the second center positioning disk are respectively provided with a first positioning center and a second positioning center. The center of the first center positioning disk and the center of the bottom plate are located on the same axis. The first center positioning disk is fixedly connected to the bottom plate. The fixing plates are evenly arranged on the circumference of the first center positioning disk and the second center positioning disk, the fixing plates are slidably connected to the bottom plate, and the fixing plates are movably connected to the first center positioning disk and the second center positioning disk respectively.

[0008] Preferably, a third rod is provided between the bottom of the fixing plate and the first central positioning plate; Two ends of the third rod are respectively connected to the first central positioning plate and the bottom of the fixing plate.

[0009] Preferably, a fourth rod is provided between the fixing plate and the second center positioning plate; One end of the fourth rod is detachably connected to the top of the fixing plate, and the other end of the fourth rod is connected to the peripheral side of the second central positioning disk.

[0010] Preferably, the third rod and the fourth rod are telescopic rods, and the third rod and the fourth rod are respectively sleeved with a first spring and a second spring; The two ends of the first spring are respectively fixedly connected to the bottom of the fixing plate and the first central positioning plate; Two ends of the second spring are respectively fixedly connected to the fixing plate and the second center positioning plate.

[0011] Preferably, a laser transmitter is provided on the first positioning center; The laser transmitter is located at the exact center of the first central positioning disk.

[0012] Preferably, the interior of the second central positioning plate is a cross cavity structure arranged up and down, and the fourth rod passes through the cross cavity structure.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The Z-axis displacement change observation mechanism provided in this application has the function of quickly detecting the workpiece to be tested. Relative to the displacement vector of the original coordinates of the measuring instrument on the Z axis, the workpiece center alignment mechanism quickly finds the geometric center of the workpiece to be measured. At the same time, since the second slide rail is arranged along the diagonal of the base and a scale is arranged on the second slide rail, the changes in the horizontal displacement of the workpiece to be measured relative to the base point of the measuring machine on the X axis and the Y axis can be quickly found, thereby quickly determining the displacement vector of the workpiece to be measured relative to the base point coordinate system of the measuring machine; The alignment mechanism provided by the present application has the function of quickly finding the geometric center of the workpiece to be measured, specifically: taking the first positioning center as a reference, placing the workpiece to be measured on the bottom plate of the workpiece center alignment mechanism, adjusting the position of the workpiece to be measured on the bottom plate to achieve the coincidence of the second positioning center with the first positioning center, and finally finding the geometric center of the workpiece to be measured. When other tests on the workpiece to be measured are performed with the geometric center of the workpiece to be measured as a reference, the geometric center remains unchanged, thus overcoming the defect that re-alignment is required when changing a detection point; The cooperation between the fixing plate provided in the present application and the third rod and the fourth rod can ensure the stability of the workpiece to be measured during the measurement process; The device is reasonably fixed on the three-coordinate measuring platform. Since the reference coordinate system of the device, that is, the coordinate system of the base point measuring ball of the measuring instrument is fixed, the step of manually establishing a rough benchmark can be omitted, thereby simplifying the inspection process. At the same time, when the device is used for batch inspection, it is not necessary to perform multiple alignments, thereby reducing the idle time of the machine and greatly improving the inspection efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a rapid alignment device for a coordinate measuring machine part in one embodiment of the present application; Figure 2 This is a schematic diagram of the base structure in a rapid alignment device for a coordinate measuring machine part in one embodiment of the present application; Figure 3 This is a front view of a workpiece center alignment mechanism in a rapid alignment device for parts of a coordinate measuring machine in one embodiment of the present application; Figure 4 A top view of a workpiece center alignment mechanism in a rapid alignment device for a coordinate measuring machine part in one embodiment of the present application; Figure 5 This is a schematic structural diagram of a second center positioning plate in a rapid alignment device for a part of a coordinate measuring machine in one embodiment of the present application; Figure 6 This is a schematic diagram of the connection structure between the fixed plate and the fourth rod in the rapid alignment device for a three-dimensional coordinate measuring machine part in one embodiment of the present application. Among them, 1. base; 2. first slide rail; 3. base point measuring ball; 4. level; 5. first rod; 6. second rod; 7. bottom plate; 8. fixing plate; 9. first center positioning disk; 10. second center positioning disk; 11. first positioning center; 12. second positioning center; 13. fourth rod; 14. dial; 15. horizontal adjustment hole; 16. third rod; 17. alignment mechanism; 18. positioning block. DETAILED DESCRIPTION

[0015] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0016] Please see attached Figure 1-6 The rapid alignment device for parts of a three-dimensional coordinate measuring machine shown in the figure comprises a base 1 and an alignment mechanism 17 arranged on the base 1; A rapid alignment device for parts of a three-dimensional coordinate measuring machine, the device comprising a base 1 and an alignment mechanism 17 arranged on the base 1; A base point measuring ball 3 of the measuring instrument is installed at one vertex of the base 1, and two sides of the vertex of the base 1 on which the base point measuring ball 3 is installed move in parallel to the original X-axis and Y-axis of the measuring instrument respectively; a level 4 is arranged on the base 1; The alignment mechanism 17 includes a Z-axis displacement change observation mechanism and a workpiece center alignment mechanism arranged from bottom to top; The workpiece center alignment mechanism is installed on the top of the Z-axis displacement change observation mechanism and is used to align the geometric center of the workpiece to be measured; The Z-axis displacement change observation mechanism is used to adjust the displacement of the alignment mechanism on the Z-axis. The Z-axis displacement change observation mechanism is installed on the base and slides diagonally on the base along the top angle where the base point measuring ball 3 is located to achieve movement along the original X-axis and Y-axis directions of the measuring instrument.

[0017] The base 1 is a regular quadrilateral plate, a first slide rail 2 is arranged on the base 1, and level adjustment mechanisms are respectively arranged at the four corners of the base 1; The first slide rail 2 is arranged diagonally along the top angle of the base where the base point measuring ball 3 is installed, and a scale is arranged on the first slide rail 2; The Z-axis displacement change observation mechanism is movably connected in the first slide rail 2; The level meter 4 is installed on one side of the first slide rail 2 , and the level meter 4 is fixed on the top of the base 1 .

[0018] In the present invention, the base 1 is detachably connected to the base point measuring ball 3 of the measuring instrument, and a horizontal adjustment hole 15 is provided at the corner of the base 1; The level adjustment hole 15 is provided with a level adjustment mechanism (in the present application, the level adjustment mechanism is an adjustment bolt, and the level adjustment of the base 1 is performed by the adjustment bolt); The base point measuring ball 3 of the measuring instrument is located at one end of the first slide rail 2; The first slide rail 2 is arranged along the diagonal line of the top angle of the base on which the base point measuring ball 3 is installed, the first slide rail 2 passes through the axis of the center of the base 1, and there is a scale on the first slide rail 2; The level 4 is located on one side of the first slide rail 2, and the level 4 is fixed on the upper surface of the base 1; A first slider matching the shape of the first slide rail 2 is arranged at the center of the bottom of the alignment mechanism 17. The first slider is slidably connected to the first slide rail 2. The first slider is fixedly connected to the top of the alignment mechanism 17 to realize the sliding connection between the alignment mechanism 17 and the first slide rail 2.

[0019] In the present invention, the alignment mechanism 17 includes a Z-axis displacement change observation mechanism and a workpiece center alignment mechanism; The top of the Z-axis displacement change observation mechanism is fixedly connected to the workpiece center alignment mechanism, and the bottom of the Z-axis displacement change observation mechanism is slidably connected to the base 1.

[0020] The Z-axis displacement change observation mechanism is used to adjust the displacement of the alignment mechanism on the Z-axis. The Z-axis displacement change observation mechanism is installed on the base and slides diagonally along the top angle where the base point measuring ball 3 is located on the base to achieve movement along the original X-axis and Y-axis directions of the measuring instrument.

[0021] In the present invention, the Z-axis displacement change observation mechanism comprises a first rod 5 and a second rod 6 which are slidably connected; The first rod 5 is a hollow rod, the top of the first rod 5 is slidably connected to the second rod 6, and the first slider is connected to the bottom of the first rod 5 to achieve a slidable connection between the bottom of the first rod 5 and the first slide rail 2; a second slide rail is provided on one side of the inner wall of the first rod 5, and a penetrating connection hole is opened on the side wall of the first rod 5; A rotating shaft is arranged in the connecting hole; The rotating shaft passes through the connecting hole, and the two ends of the rotating shaft are respectively located at the inner and outer sides of the first rod 5. The circumference of the end of the rotating shaft located inside the first rod 5 is provided with teeth, and the end of the rotating shaft located outside the first rod 5 is fixedly connected with a dial 14; One end of the second rod 6 is inserted into the first rod 5, and the other end of the second rod 6 is fixedly connected to the workpiece center alignment mechanism. A second slider matching the second slide rail is provided on the side of the second rod 6 close to the second slide rail, and the second slider is connected to the connection where the second rod 6 contacts the first rod 5. The second slider is slidably connected to the second slide rail, and a rack is provided on the side of the second rod 6 close to the connection hole; The rack is axially arranged along the second rod 6 and the first rod, the rack is mounted on the second rod 6, and the rack is meshed with the teeth.

[0022] In the present invention, the center of the workpiece center alignment mechanism, the first rod 5, the second rod 6 and the center of the first sliding block are all located on the same axis.

[0023] In the present invention, the workpiece center alignment mechanism includes a base plate 7; The bottom plate 7 is a hollow regular quadrilateral plate body, a first center positioning plate 9 is arranged on the inner side of the bottom plate 7, a second center positioning plate 10 is arranged on the top of the outer side of the bottom plate 7, and a plurality of fixing plates 8 are arranged on the outer side of the bottom plate 7; The first center positioning disk 9 is located below the second center positioning disk 10. The first center positioning disk 9 and the second center positioning disk 10 are respectively provided with a first positioning center 11 and a second positioning center 12. The center of the first center positioning disk 9 and the center of the bottom plate 7 are located on the same axis. The first center positioning disk 9 is fixedly connected to the bottom plate 7. The fixing plates 8 are evenly arranged around the first center positioning disk 9 and the second center positioning disk 10 , and are slidably connected to the bottom plate 7 . The fixing plates 8 are movably connected to the first center positioning disk 9 and the second center positioning disk 10 , respectively.

[0024] In the present invention, a third slider is provided at the bottom of the fixing plate 8, and the third slider is fixedly connected to the fixing plate 8; The bottom plate 7 is provided with a third slide rail matching the third slide block; The third slide rail is radially arranged toward the periphery of the bottom plate 7 with the center of the bottom plate 7 as a reference, and the third slide rail is slidably connected to the third slider; A third rod 16 is provided between the third slider and the first center positioning plate 9; The two ends of the third rod 16 are fixedly connected to the peripheral side of the first center positioning plate 9 and the third sliding block respectively.

[0025] In the present invention, a fourth rod 13 is provided between the fixing plate 8 and the second center positioning plate 10; One end of the fourth rod 13 is detachably connected to the top of the fixing plate 8 , and the other end of the fourth rod 13 is fixedly connected to the peripheral side of the second center positioning plate 10 .

[0026] It should be noted that, in the present invention, the detachable connection between the fourth rod 13 and the fixed plate 8 is achieved by means of a positioning block and a connecting groove. Specifically, a connecting groove is provided at the top of the fixed plate 8, and a positioning block 18 is provided at one end where the fourth rod 13 is connected to the fixed plate 8. The positioning block 18 matches the shape of the connecting groove, the positioning block 18 is fixedly connected to the fourth rod 13, and the positioning block 18 is movably inserted into the connecting groove. Meanwhile, corresponding positioning holes are provided on the positioning block 18 and the groove wall of the connecting groove. When connecting the fourth rod 13 to the fixed plate 8, the positioning block 18 is inserted into the connecting groove, and the positioning pins are sequentially passed through the groove wall of the connecting groove and the positioning holes provided on the positioning block 18, so as to achieve the detachable connection between the positioning block 18 and the connecting groove.

[0027] In the present invention, the third rod 16 and the fourth rod 13 are telescopic rods, and the third rod 16 and the fourth rod 13 are respectively sleeved with a first spring and a second spring; The two ends of the first spring are respectively fixedly connected to the third slider and the first center positioning plate 9; Two ends of the second spring are fixedly connected to the fixing plate 8 and the second center positioning plate 10 respectively.

[0028] In the present invention, a laser transmitter is provided on the first positioning center 11; The laser transmitter is located at the exact center of the first central positioning disk 9 .

[0029] In the present invention, the interior of the second center positioning plate 10 is a cross cavity structure arranged up and down, and the fourth rod 13 passes through the cross cavity structure.

[0030] It should be noted that, in the present invention, the centers of the first slider and the first rod 5 are located on the same axis as the center of the bottom plate 7. The laser emitter is located at the center of the bottom plate 7, the laser beam emitted by the laser emitter is perpendicular to the bottom plate 7, and the beam is directed upward, the laser emitter is fixed on the bottom plate 7, and the upper surface of the laser emitter is not higher than the upper surface of the bottom plate 7; The use steps of the present invention are: When measuring, first, record the initial displacement of the base plate 7 from the base 1 in the Z axis, fix the base 1 in the device and the base point measuring ball 3 of the measuring instrument together, and note that the axial center line of the first slide rail 2 and the center line of the base of the base point measuring ball 3 are located on the same straight line; secondly, adjust the level of the base 1 through the horizontal adjustment mechanism (adjusting bolt), and check whether the base 1 is level at all times through the level meter 4 during the measurement process; then, remove the fourth rod 13 from the fixed plate 8, put the workpiece to be measured on the base plate 7, so that the workpiece to be measured is located between the first center positioning disk 9 and the second center positioning disk 10, and then fix the fourth rod 13 on the fixed plate 8, adjust the position of the fixed plate 8 through the extension and contraction of the fourth rod 13, so that the fixed plate 8 is completely clamped on the peripheral side of the workpiece to be measured, turn on the laser transmitter, and observe whether the emitted laser beam coincides with the second positioning center 12. If not, the second positioning center 12 is coincident with the center of the laser beam by horizontally moving the workpiece to be measured, and finally the center of the workpiece to be measured coincides with the center of the alignment mechanism 17; Finally, the relative displacement of the center of the alignment mechanism 17 relative to the origin of the base point measuring ball 3 of the measuring instrument is calculated by using the scale set on the first slide rail 2; the displacement of the base plate 7 on the Z axis is observed through the dial 14, thereby calculating the displacement vector of the workpiece to be measured relative to the Z axis origin of the base point measuring ball 3 of the measuring instrument; thereby quickly obtaining the relative position vector of the workpiece to be measured relative to the original coordinate system of the base point measuring ball 3 of the measuring instrument, and finally achieving rapid alignment of the workpiece to be measured.

[0031] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A rapid alignment device for parts of a three-dimensional coordinate measuring machine, characterized in that: The device comprises a base (1) and an alignment mechanism (17) arranged on the base (1); A base point measuring ball (3) of the measuring instrument is installed at a vertex of the base (1), two sides of the vertex of the base (1) on which the base point measuring ball (3) is installed are respectively parallel to the original X-axis and Y-axis of the measuring instrument, and a level (4) is arranged on the base (1); The alignment mechanism (17) comprises a Z-axis displacement change observation mechanism and a workpiece center alignment mechanism arranged from bottom to top; The workpiece center alignment mechanism is installed on the top of the Z-axis displacement change observation mechanism and is used to align the geometric center of the workpiece to be measured; The Z-axis displacement change observation mechanism is used to adjust the displacement of the alignment mechanism on the Z-axis. The Z-axis displacement change observation mechanism is mounted on the base (1) and slides diagonally on the base (1) along the top angle where the base point measuring ball (3) is located, so as to achieve movement along the original X-axis and Y-axis directions of the measuring instrument.

2. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 1 is characterized in that: The base (1) is a regular quadrilateral plate, a first slide rail (2) is arranged on the base (1), and level adjustment mechanisms are respectively arranged at the four corners of the base (1); The first slide rail (2) is arranged in a diagonal direction along the top corner of the base on which the base point measuring ball (3) is installed, and a scale is provided on the first slide rail (2); The Z-axis displacement change observation mechanism is movably connected in the first slide rail (2); The level (4) is installed on one side of the first slide rail (2), and the level (4) is fixed on the top of the base (1).

3. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 2 is characterized in that: The Z-axis displacement change observation mechanism comprises a first rod (5) and a second rod (6) arranged in sequence from bottom to top; The first rod (5) is a hollow rod, and the bottom of the first rod (5) is slidably connected to the first slide rail (2); One end of the second rod (6) is inserted into the first rod (5) and is slidably connected to the first rod (5), and the other end of the second rod (6) is fixedly connected to a workpiece center alignment mechanism.

4. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 3 is characterized in that: A z-axis displacement change observation mechanism is provided between the first rod (5) and the second rod (6); The Z-axis displacement change observation mechanism comprises a connecting hole provided at an end of the first rod (5) close to the second rod (6) and passing through, a rotating shaft arranged in the connecting hole, and a rack arranged at one end of the second rod (6) close to the first rod (5); The rotating shaft passes through the connecting hole, and the two ends of the rotating shaft are respectively located at the inner and outer sides of the first rod (5), the circumference of the end of the rotating shaft located inside the first rod (5) is provided with teeth, and the end of the rotating shaft located outside the first rod (5) is fixedly connected to a dial (14); The rack is arranged along the extension direction of the second rod (6) and is mounted on the second rod (6), and the rack is meshed with the teeth.

5. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 3, characterized in that: The workpiece center alignment mechanism comprises a base plate (7); The bottom plate (7) is mounted on the top of the second rod (6); the bottom plate (7) is a hollow regular quadrilateral plate; a first center positioning plate (9) is arranged on the inner side of the bottom plate (7); a second center positioning plate (10) and a plurality of fixing plates (8) are arranged on the outer side of the bottom plate (7); The first center positioning disk (9) is located directly below the second center positioning disk (10); the first center positioning disk (9) and the second center positioning disk (10) are respectively provided with a first positioning center (11) and a second positioning center (12); the center of the first center positioning disk (9) and the center of the bottom plate (7) are located on the same axis; the first center positioning disk (9) is fixedly connected to the bottom plate (7); The fixing plates (8) are evenly arranged on the circumference of the first center positioning disk (9) and the second center positioning disk (10), the fixing plates (8) are slidably connected to the bottom plate (7), and the fixing plates (8) are movably connected to the first center positioning disk (9) and the second center positioning disk (10), respectively.

6. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 5, characterized in that: A third rod (16) is provided between the bottom of the fixing plate (8) and the first central positioning plate (9); Two ends of the third rod (16) are respectively connected to the first central positioning plate (9) and the bottom of the fixing plate (8).

7. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 6, characterized in that: A fourth rod (13) is provided between the fixing plate (8) and the second center positioning plate (10); One end of the fourth rod (13) is detachably connected to the top of the fixing plate (8), and the other end of the fourth rod (13) is connected to the peripheral side of the second central positioning plate (10).

8. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 7, characterized in that: The third rod (16) and the fourth rod (13) are both telescopic rods, and the third rod (16) and the fourth rod (13) are respectively sleeved with a first spring and a second spring; The two ends of the first spring are respectively fixedly connected to the bottom of the fixing plate (8) and the first central positioning plate (9); Two ends of the second spring are respectively fixedly connected to a fixing plate (8) and a second center positioning plate (10).

9. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 5, characterized in that: The first positioning center (11) is provided with a laser transmitter; The laser transmitter is located at the exact center of the first central positioning disk (9).

10. The rapid alignment device for parts of a three-dimensional coordinate measuring machine according to claim 7, characterized in that: The interior of the second central positioning plate (10) is a cross cavity structure arranged vertically, and the fourth rod (13) passes through the cross cavity structure.

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