Auxiliary supporting structure for rotary table of three-coordinate measuring instrument

Abstract

The invention provides a three-coordinate measuring instrument rotary table auxiliary supporting structure which comprises an upper thrust ring and auxiliary supporting stand column assemblies, and a plurality of auxiliary supporting stand column assemblies are arranged on the outer side of a main shaft in the circumferential direction. The upper thrust ring is mounted on the lower surface of the turntable and arranged along the circumference of the turntable; the upper thrust ring is supported by the auxiliary bearing stand column assemblies. The auxiliary supporting stand column assemblies are additionally arranged on the outer side of the main shaft of the rotary table, so that the anti-overturning capacity of the rotary table in the unbalance loading state is improved, and the detection precision in the state is improved. By means of the method, the original structure, the rotary motion and the control mode of the rotary table can be kept unchanged, mechanical damage and abrasion to the rotary table are avoided, the rigidity of the rotary table is improved through the additionally-arranged rotary table auxiliary support, the rotary table inclination amount generated when the table top of the rotary table bears unbalance loading is reduced, and precision measurement of the three-coordinate rotary table is not affected.

Description

Technical Field

[0001] The invention belongs to the field of mechanical detection, and in particular relates to an auxiliary support structure for a turntable of a three-coordinate measuring instrument. Background Art

[0002] With the rapid development of modern manufacturing technology, various precision machining methods are also developing rapidly. Therefore, the precision of parts obtained is getting higher and higher, and the requirements for instrument detection accuracy are also further improved.

[0003] The turntable of the three-coordinate measuring machine has a large diameter, while the turntable spindle has a small diameter. If the workpiece to be tested is placed on the three-coordinate table and the center of gravity of the workpiece is not within the range of the turntable spindle diameter, the turntable will be insufficiently rigid and prone to slight tilt due to eccentric loading of the center of gravity. The end face of the turntable will have obvious end face runout, which will affect the high-precision detection of the three-coordinate measuring machine. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an auxiliary support structure for the turntable of a three-coordinate measuring instrument, which can maintain the original structure, rotational motion and control method of the turntable unchanged. The added turntable auxiliary support improves the rigidity of the turntable and reduces the inclination of the turntable caused by the load on the turntable surface without affecting the precise measurement of the three-coordinate turntable.

[0005] The technical solution adopted by the present invention is as follows: an auxiliary support structure of a turntable of a three-dimensional coordinate measuring instrument, wherein the turntable and an upper thrust ring are installed together from top to bottom, and are installed together on the turntable to rotate around the main axis of the turntable. The auxiliary support structure includes an upper thrust ring and an auxiliary support column assembly, wherein a plurality of auxiliary support column assemblies are arranged along the circumferential direction on the outer side of the main axis of the turntable; the upper thrust ring is installed on the lower surface of the turntable, and the upper thrust ring is coaxially arranged with the turntable; and a plurality of auxiliary support column assemblies support the upper thrust ring.

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

[0007] The present invention uses bearing balls in the field of auxiliary support, which is different from the conventional bearings in terms of function and motion transmission. The height adjustment block can be processed according to real-time detection data to ensure that the turntable is supported by the auxiliary support system all around. The height of the height adjustment block is trimmed according to the real-time detected height data to ensure the smooth rotation of the test table. Compared with other height adjustment mechanisms, this device has higher stability and accuracy and strictly controls the end face runout of the turntable.

[0008] A number of auxiliary support components are added to the outer side of the main shaft of the turntable to improve the turntable's anti-overturning ability when it is subjected to an eccentric load, thereby improving the detection accuracy in this state.

[0009] The large ball in the support assembly under the turntable can ensure that there is a gap between the lower thrust ring and the upper thrust ring. Similarly, the small ball can ensure that there is a gap between the lower thrust ring and the retaining frame to avoid large losses caused by surface contact. When the turntable rotates, rolling friction occurs between the ball and the bottom surface of the turntable, and there is obvious relative motion between the contact surface and the ball, which is different from the traditional bearing transmission motion method.

[0010] The balls in the support assembly are restrained by a cage. Since the balls will roll around without restraint due to rolling friction with the bottom surface of the turntable, a cage retaining ring is added to prevent the balls from rolling off the thrust ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the structure diagram of the turntable of the three-coordinate measuring machine;

[0012] Figure 2 It is the auxiliary support structure diagram;

[0013] Figure 3 The structure diagram of the cage is shown in Figure 2.

[0014] Figure 4 Schematic diagram of the height adjustment block.

[0015] In the figure, there are upper thrust ring 1, retaining frame 2, retaining frame retaining ring 3, lower thrust ring 4, height adjustment block 5, supporting seat 6, small ball 7, large ball 8, main shaft 10, turntable 11, and auxiliary supporting column assembly 13. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above-mentioned purpose, the present invention adopts the following technical scheme.

[0017] like Figure 1 As shown, the turntable of the three-dimensional coordinate measuring machine includes a main shaft 10 and a turntable 11. Among them, the turntable 11 is installed on the main shaft 10 and can rotate around the main shaft 10. The auxiliary support structure of the turntable of the three-dimensional coordinate measuring machine includes an upper thrust ring 1 and a plurality of auxiliary support column assemblies 13. A plurality of auxiliary support column assemblies 13 are added along the circumferential direction on the outer side of the main shaft 10 to prevent the turntable 11 from overturning under an eccentric load state; the upper thrust ring 1 is installed on the lower surface of the turntable 11, along the circumference of the turntable 11 and coaxially arranged with the turntable; a plurality of auxiliary support column assemblies 13 support the upper thrust ring 1. The auxiliary support column assembly 13 includes a retainer 2, a retainer retainer ring 3, a lower thrust ring 4, a height adjustment block 5, a support seat 6, a small ball 7, and a large ball 8.

[0018] like Figure 2 As shown, the upper thrust ring 1 is installed with the turntable 11 and is a ring-shaped structure. When the turntable 11 rotates, the upper thrust ring 1 rotates together with the turntable 11. Figure 3 As shown, the retainer 2 is circular and used to retain the large ball 8 and the small ball 7. The retainer 2 is evenly provided with a plurality of grooves along the outermost layer of the circumference for installing the small ball 7. The retainer 2 is provided with a plurality of through holes for installing the large ball 8. The outer periphery of the retainer 2 is retained on the upper end face of the lower thrust ring 4 by the retainer retainer ring 3. The retainer retainer ring 3 is an L-shaped structure, which is fixed to the upper end face of the lower thrust ring 4 by screws. The large ball 8 and the upper end face of the lower thrust ring 4 are subjected to rolling friction. The single large ball 8 is separated by the retainer 2, and then they are restricted on the lower thrust ring 4 by the retainer retainer ring 3 together to prevent the large ball 8 from rolling off. The small ball 7 supports the retainer and leaves a gap with the lower thrust ring 4. The large ball 8 supports the upper thrust ring 1 and leaves a gap with the retainer 2. The small ball 7 can support the retainer 2 to prevent the large ball 8 from sliding friction with the lower thrust ring 4 and reduce the loss.

[0019] Preferably, the number of grooves for mounting small balls is 4, with one groove being arranged every 90 degrees along the circumference.

[0020] Preferably, the through holes for mounting the large balls are evenly distributed in an array.

[0021] A height adjustment block 5 is arranged at the lower end of the lower thrust ring 4, and the height is adjusted by the height adjustment block 5. The height can be adjusted by 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 seat 6 at the lower end of the height adjustment block 5 is fixed on the workbench, and the height of the upper end face is adjusted in cooperation with the height adjustment block 5, thereby ensuring that when the turntable 11 rotates, the end face jump is reduced as much as possible to ensure the detection accuracy of the working turntable.

Claims

1. A three-coordinate measuring machine turntable auxiliary support structure, the three-coordinate measuring machine turntable includes a spindle and a turntable, characterized in that: The turntable and the upper thrust ring are installed together from top to bottom, and are installed together on the turntable, and rotate around the turntable main shaft. The auxiliary support structure includes an upper thrust ring and an auxiliary support column assembly, wherein a plurality of auxiliary support column assemblies are arranged along the circumferential direction on the outer side of the turntable main shaft; and the plurality of auxiliary support column assemblies support the upper thrust ring.

2. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 1, characterized in that: The auxiliary support column assembly comprises a cage, a cage retaining ring, a lower thrust ring, a height adjustment block, a support seat, a small ball and a large ball.

3. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: When the turntable rotates, the upper thrust ring rotates with the turntable; the retaining frame is used to retain large and small balls. The retaining frame is circular, and grooves are evenly arranged along the circumferential direction on the outermost side of the circle for installing small balls. Multiple through holes are arranged inside the retaining frame for installing large balls. The outer end face of the retaining frame is retained on the upper end face of the lower thrust ring by the retaining frame retaining ring.

4. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: The retaining ring of the cage is an L-shaped structure, which 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, and the single large balls are separated by the retaining ring, and then they are restricted on the lower thrust ring together by the retaining ring; the small balls support the cage.

5. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: A height adjustment block is arranged at the lower end of the lower thrust ring, and the height is adjusted by the height adjustment block.

6. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 5, characterized in that: Set height adjustment block height according to real-time monitoring data.

7. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 5, characterized in that: The lower end of the height adjustment block is installed on a support seat, and the support seat is fixed on the workbench.

8. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: The large ball causes a gap between the lower thrust ring and the upper thrust ring, and the small ball causes a gap between the lower thrust ring and the retaining frame.

9. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: There are four grooves for mounting small balls, one of which is arranged every 90 degrees along the circumference.

10. The auxiliary support structure for a turntable of a three-dimensional coordinate measuring machine according to claim 2, characterized in that: The through holes for mounting the large balls are evenly distributed in an array.

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