A three-coordinate measuring instrument rotary table auxiliary support structure

Abstract

The application provides a three-coordinate measuring instrument rotary table auxiliary supporting structure, which comprises an upper thrust ring and an auxiliary supporting column assembly, and a plurality of auxiliary supporting column assemblies are arranged in the circumferential direction outside the main shaft; the upper thrust ring is installed on the lower surface of the rotary table and is arranged along the circumference of the rotary table; and the plurality of auxiliary supporting column assemblies support the upper thrust ring. The application increases the plurality of auxiliary supporting column assemblies outside the main shaft of the rotary table, improves the anti-overturning capacity of the rotary table under the eccentric load state, and improves the detection precision under the state. The original structure, rotary motion and control mode of the rotary table can be maintained by the method, mechanical damage and wear of the rotary table are not caused, the rigidity of the rotary table is improved by the increased auxiliary supporting of the rotary table, the inclination of the rotary table caused by the eccentric load on the rotary table surface is reduced, and the precise measurement of the three-coordinate rotary table is not affected.

Description

Technical Field

[0001] This invention belongs to the field of mechanical testing, specifically an auxiliary support structure for a coordinate measuring machine turntable. Background Technology

[0002] With the rapid development of modern manufacturing technology, various precision machining methods are also developing at a rapid pace. As a result, the precision of the parts produced is becoming increasingly higher, and the corresponding requirements for the accuracy of instrument testing are also further increasing.

[0003] The coordinate measuring machine (CMM) has a large turntable diameter, while the turntable spindle diameter is small. When the workpiece to be inspected is placed on the CMM table, if the center of gravity of the workpiece is not within the range of the turntable spindle diameter, the turntable will not be rigid enough and will easily tilt slightly due to the center of gravity being off-center. The end face of the turntable will have obvious end face runout, which will affect the high-precision inspection of the CMM. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an auxiliary support structure for a coordinate measuring machine turntable. While maintaining the original structure, rotational motion and control method of the turntable, the added auxiliary support increases the rigidity of the turntable, reduces the tilting of the turntable caused by the load on the turntable surface, and does not affect the precision measurement of the coordinate measuring machine turntable.

[0005] The technical solution adopted in this invention is as follows: A coordinate measuring machine turntable auxiliary support structure, wherein the turntable and the upper thrust ring are installed together from top to bottom on the turntable and rotate around the turntable spindle. The auxiliary support structure includes an upper thrust ring and auxiliary support column assemblies, wherein a plurality of auxiliary support column assemblies are arranged along the circumferential direction on the outer side of the turntable spindle; the upper thrust ring is installed on the lower surface of the turntable and is coaxially arranged with the turntable; the plurality of auxiliary support column assemblies support the upper thrust ring.

[0006] The present invention has the following beneficial effects:

[0007] This invention utilizes bearing balls in an auxiliary support field, differing from the function and motion transmission of conventional bearings. The height adjustment block can be processed based on real-time detection data to ensure that the turntable is supported by an auxiliary support system around it. The height of the height adjustment block is adjusted according to the real-time height detection data to ensure smooth rotation of the detection table. Compared with other height adjustment mechanisms, this device has higher stability and precision, and strictly controls the end face runout of the turntable.

[0008] Several auxiliary support components are added to the outside of the turntable's main shaft to improve the turntable's anti-overturning ability under eccentric load conditions and improve the detection accuracy under such conditions.

[0009] The large balls in the support assembly beneath the turntable ensure a gap between the lower and upper thrust rings, and similarly, the small balls ensure a gap between the lower thrust ring and the cage, preventing excessive wear from surface contact. When the turntable rotates, the balls experience rolling friction with the bottom surface of the turntable, resulting in significant relative movement between the contact surface and the balls, unlike the motion transmission method of traditional bearings.

[0010] The balls in the support assembly are restrained by a cage. Since the balls roll around due to rolling friction with the bottom surface of the turntable, they will roll around without restraint. Therefore, a cage retainer ring is added to prevent the balls from rolling down the thrust ring. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the rotary table of a coordinate measuring machine;

[0012] Figure 2 For auxiliary support structure diagram;

[0013] Figure 3 For cage structure diagram;

[0014] Figure 4 This is a schematic diagram of the height adjustment block.

[0015] In the figure, the components are: upper thrust ring 1, cage 2, cage retaining ring 3, lower thrust ring 4, height adjustment block 5, support seat 6, small ball bearing 7, large ball bearing 8, main shaft 10, turntable 11, and auxiliary support column assembly 13. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above objectives, this invention adopts the following technical solution.

[0017] like Figure 1 As shown, the coordinate measuring machine (CMM) rotary table includes a spindle 10 and a rotary table 11. The rotary table 11 is mounted on the spindle 10 and can rotate around it. The auxiliary support structure of the CMM rotary table includes an upper thrust ring 1 and several auxiliary support column assemblies 13. Several auxiliary support column assemblies 13 are added circumferentially outside the spindle 10 to prevent the rotary table 11 from overturning under eccentric load. The upper thrust ring 1 is mounted on the lower surface of the rotary table 11, along the circumference of the rotary table 11 and coaxial with it. The several auxiliary support column assemblies 13 support the upper thrust ring 1. The auxiliary support column assembly 13 includes a cage 2, a cage retaining ring 3, a lower thrust ring 4, a height adjustment block 5, a support base 6, small ball bearings 7, and large ball bearings 8.

[0018] like Figure 2 As shown, the upper thrust ring 1 is installed on the turntable 11 in a ring structure. When the turntable 11 rotates, the upper thrust ring 1 rotates together with the turntable 11. Figure 3 As shown, the cage 2 is circular and is used to hold the large ball 8 and the small ball 7. Several grooves are evenly distributed along the outermost layer of the cage 2's circumference for mounting the small ball 7. Multiple through holes are provided inside the cage 2 for mounting the large ball 8. The outer periphery of the cage 2 is held to the upper end face of the lower thrust ring 4 by a cage retainer ring 3. The cage retainer ring 3 has an L-shaped structure and is fixed to the upper end face of the lower thrust ring 4 with screws. The large ball 8 rolls and rubs against the upper end face of the lower thrust ring 4. The cage 2 separates the individual large balls 8, and they are then confined together on the lower thrust ring 4 by the cage retainer ring 3, preventing the large balls 8 from rolling off. The small ball 7 supports the cage and leaves a gap between itself and the lower thrust ring 4. The large ball 8 supports the upper thrust ring 1 and leaves a gap between itself and the cage 2. The small ball 7 supports the cage 2, preventing the large ball 8 from sliding and rubbing against the lower thrust ring 4, thus reducing wear.

[0019] Preferably, there are 4 grooves for installing small balls, one of which is set every 90 degrees along the circumference.

[0020] Preferably, the through holes for installing large ball bearings are evenly distributed in an array.

[0021] A height adjustment block 5 is installed at the lower end of the lower thrust ring 4, and the height is adjusted by means of the height adjustment block 5. The height can be adjusted by means of the height adjustment block 5 according to real-time monitoring data without affecting the rotation accuracy of the turntable.

[0022] like Figure 4 As shown, the support base 6 at the lower end of the height adjustment block 5 is fixed on the worktable. By cooperating with the height adjustment block 5, the height of the upper end face is adjusted, thereby ensuring that when the turntable 11 rotates, the runout of the end face is minimized to ensure the detection accuracy of the turntable.

Claims

1. An auxiliary support structure for a coordinate measuring machine (CMM) turntable, the CMM turntable comprising a spindle and a turntable, characterized in that, The turntable and the upper thrust ring are installed together from top to bottom on the turntable and rotate around the turntable's main shaft. The auxiliary support structure includes the upper thrust ring and auxiliary support column assemblies. Several auxiliary support column assemblies are arranged along the circumferential direction on the outside of the turntable's main shaft. The several auxiliary support column assemblies support the upper thrust ring. The auxiliary support column assembly includes a cage, a cage retaining ring, a lower thrust ring, a height adjustment block, a support base, small ball bearings, and large ball bearings. When the turntable rotates, the upper thrust ring rotates together with the turntable; the cage is used to hold the large ball and the small ball. The cage is circular, and grooves are evenly arranged along the circumferential direction on the outermost side of the circumference for installing the small ball. Multiple through holes are provided inside the cage for installing the large ball. The outer circumferential end face of the cage is held to the upper end face of the lower thrust ring by the cage retaining ring. The cage retainer ring has an L-shaped structure and is fixed to the upper end face of the lower thrust ring by screws. The large balls roll and rub against the upper end face of the lower thrust ring. The cage separates the individual large balls, and then they are all constrained on the lower thrust ring by the cage retainer ring. The small balls support the cage.

2. The auxiliary support structure for a coordinate measuring machine turntable according to claim 1, characterized in that, A height adjustment block is installed at the lower end of the thrust ring, and the height is adjusted by means of the height adjustment block.

3. The auxiliary support structure for a coordinate measuring machine turntable according to claim 2, characterized in that, Adjust the block height based on real-time monitoring data.

4. The auxiliary support structure for a coordinate measuring machine turntable according to claim 2, characterized in that, The lower end of the height adjustment block is installed on the support base, which is fixed on the worktable.

5. The auxiliary support structure for a coordinate measuring machine turntable according to claim 1, characterized in that, Large balls create a gap between the lower and upper thrust rings, while small balls create a gap between the lower thrust ring and the cage.

6. The auxiliary support structure for a coordinate measuring machine turntable according to claim 1, characterized in that, There are four grooves for installing small ball bearings, one every 90 degrees along the circumference.

7. The auxiliary support structure for a coordinate measuring machine turntable according to claim 1, characterized in that, The through holes for installing large ball bearings are evenly distributed in an array.

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