A CT stage

Abstract

This utility model relates to a CT stage, specifically in the field of industrial CT technology. It includes a slider base, a lifting base fixedly installed below the slider base, a lifting screw at the center of the lifting base, a transverse slider located below the slider base and away from the screw, a lifting slide mounted on the lifting screw, a two-axis fine-tuning platform fixedly installed on the top of the lifting slide, and an air-bearing rotary table fixedly installed on the top of the two-axis fine-tuning platform. The two-axis fine-tuning platform includes a base plate, a pair of transverse screws fixedly installed on the top of the base plate at one diagonal end, each transverse screw slidably mounted with a transverse slider, and a first slider vertically mounted on the top of each transverse slider. A pair of longitudinal screws fixedly installed on the top of the base plate at the other diagonal end, each longitudinal screw slidably mounted with a longitudinal slider, and a second slider transversely mounted on the top of each longitudinal slider. A top plate is fixedly installed on the top of the first and second sliders. This design does not affect the turntable's moment of inertia and center of mass properties, thus improving positioning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of industrial CT technology, specifically to a CT stage. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] The stage (sample stage) of an industrial CT scanner is a key component for supporting and positioning the workpiece being measured. Its design directly affects scanning accuracy, efficiency, and applicability. Most existing stage types adopt a multi-axis linkage type, which places the lifting and adjustment structure on a turntable. The lifting and adjustment mechanism rotates with the turntable. Multi-axis linkage stages combine rotational and translational degrees of freedom (such as XYZ three-axis translation + rotation). Advantages: flexible adjustment of workpiece position and angle, adaptability to complex shapes (such as curved surfaces and irregular parts), and high-resolution scanning of aerospace blades, complex automotive castings, and multi-angle defects.

[0004] Existing multi-axis control tables have the following technical problems:

[0005] (1) The existing multi-axis linkage type places the lifting and adjusting structure on the turntable. The lifting and adjusting mechanism rotates with the turntable. This makes the mass of the mechanism on the turntable and the workpiece to be measured large. When the mechanism on the turntable is adjusted, the center of mass will change position, which will affect the rotation positioning accuracy of the turntable. The volume of the turntable affects the arrangement of the lifting and adjusting mechanism, resulting in poor accuracy of the lifting and adjusting mechanism and affecting the imaging accuracy.

[0006] (2) Before the existing sample is detected, the object to be tested needs to be placed on the turntable. The existing turntable can only be moved vertically. The turntable and the lifting mechanism are fixed and cannot be adjusted horizontally. The bottom slide rail can be driven to make the entire stage move horizontally, so as to achieve accurate placement of the sample and laser positioning (the accurate laser positioning system projects a cross laser line to mark the reference point, place the positioning mark, and accurately place the sample). However, the bottom slide rail makes the entire stage move a large distance, which leads to the distance between the object to be tested and the optical engine being too large or too small, resulting in low positioning efficiency. Utility Model Content

[0007] The purpose of this invention is to provide a CT stage that can at least solve one of the above-mentioned technical problems.

[0008] To achieve the above objectives, this utility model proposes a CT stage, including a slider base, a lifting base fixedly installed below the slider base, a lifting screw arranged at the center of the lifting base, a transverse slider arranged below the slider base and away from the screw, a lifting slide slidably installed on the lifting screw, a two-axis fine-tuning platform fixedly installed on the top of the lifting slide, and an air-float rotary turntable fixedly installed on the top of the two-axis fine-tuning platform.

[0009] The two-axis fine-tuning platform includes a base plate, on the top of the base plate and at both ends of one diagonal, a pair of horizontal lead screws are fixedly installed, each horizontal lead screw is slidably provided with a horizontal slider, and a first slider is vertically provided on the top of the horizontal slider. On the top of the base plate and at both ends of the other diagonal, a pair of vertical lead screws are fixedly installed, each vertical lead screw is slidably provided with a vertical slider, and a second slider is horizontally provided on the top of the vertical slider. A top plate is fixedly installed on the top of the first slider and the second slider.

[0010] A further configuration is provided where a protrusion is provided at the top of the horizontal slider, a first slider is provided at the top of the protrusion, the first slider is a C-shaped block, a receiving groove is formed between the outer wall of the protrusion and the inner wall of the C-shaped block, and a horizontal guide shaft is provided in the receiving groove.

[0011] A further configuration is provided whereby a protrusion is provided at the top of the longitudinal slider, a second slider is provided at the top of the protrusion, the second slider is a C-shaped block, a receiving groove is formed between the outer wall of the protrusion and the inner wall of the C-shaped block, and a longitudinal guide shaft is provided in the receiving groove.

[0012] A further configuration is made such that the central axis of the transverse lead screw is perpendicular to the central axis of the longitudinal lead screw, ensuring that the axes of the transverse (X-direction) and vertical (Y-direction) lead screws are perpendicular to each other.

[0013] Further configuration involves installing a horizontal motor at one end of the horizontal lead screw and a vertical motor at one end of the vertical lead screw, with each fine-tuning axis equipped with an independent servo motor or stepper motor, thus realizing electric drive and digital program control for fine-tuning motion.

[0014] A further configuration is provided whereby a turntable base is fixedly installed on the top of the fine-tuning platform, and a platform is provided on the top of the turntable base. The turntable base serves as a robust transition structure, providing an installation reference surface for the air-bearing rotary turntable.

[0015] A further feature is that the slider base has a groove corresponding to the lifting slide, and the width of the groove is greater than the width of the lifting slide. The groove design ensures that the lifting slide has sufficient movement clearance within the vertical lifting stroke.

[0016] A further configuration is provided, wherein a motor is installed at the bottom of the lifting screw, the motor being a servo motor, and the motor drives the lifting screw to rotate.

[0017] A further configuration is that the transverse slider is slidably mounted on the transverse guide rail, which is mounted on the base. The transverse slider and the guide rail constitute the basis for the entire device to move over a wide range.

[0018] A further configuration is provided, wherein an optomechanical unit is installed on one side of the air-bearing rotary turntable, and a detector is installed on the other side of the air-bearing rotary turntable, and the air-bearing rotary turntable, the optomechanical unit, and the detector work together.

[0019] The beneficial effects of one or more of the above technical solutions:

[0020] (1) The turntable is used as the workpiece carrying platform. The lifting mechanism is placed under the turntable. The turntable only has the workpiece to be inspected as its load. The heavy lifting drive mechanism (lifting base and lifting screw) is removed from the rotating parts and placed under the turntable and on the fixed base. The turntable of this utility model (i.e., the air-floating rotary turntable) only needs to carry the workpiece. The load mass and rotational inertia are greatly reduced. When lifting in the Z direction, the center of mass of the turntable remains unchanged, which greatly improves the stability and positioning accuracy of the rotational motion. Thus, the imaging quality of CT scan is guaranteed from the root. The lifting adjustment will not affect the inertia and center of mass properties of the turntable, and the motion accuracy.

[0021] (2) The fine-tuning platform adopts a combination of multiple bidirectional sliders. The independently set small stroke slider has higher platform size accuracy than the large stroke slide rail, and can be fine-tuned in both horizontal and vertical directions relative to the optical machine, thereby improving positioning efficiency. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the two-axis fine-tuning platform of this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the present invention after installation with the guide rail.

[0026] In the diagram, 1. Base; 2. Transverse guide rail; 3. Detector; 4. Optomechanic; 5. Stage;

[0027] 6. Lateral sliding block; 7. Lifting base; 8. Lifting slide rail; 9. Motor; 10. Lifting lead screw; 11. Lifting slide table; 12. Two-axis fine-tuning platform; 13. Air-bearing rotary table;

[0028] 14. Base plate; 15. Transverse lead screw; 16. Transverse motor; 17. Longitudinal lead screw; 18. Longitudinal motor; 19. Transverse slider; 20. Top plate; 21. Turntable base; 22. Turntable surface; 23. Longitudinal slider; 24. First slider; 25. Second slider; 26. Receiving groove; 27. Longitudinal guide shaft; 28. Transverse guide shaft; 29. ​​Groove; 30. Slider base; 31. Protrusion. Detailed Implementation

[0029] The specific implementation of this embodiment will now be described with reference to the accompanying drawings.

[0030] Example 1

[0031] This utility model proposes a CT stage, referring to... Figure 1 The system includes a slider base 30, a lifting base 7 fixedly installed below the slider base 30, a lifting screw 10 set at the center of the lifting base 7, a transverse slider 6 set below the slider base 30 and away from the screw, a lifting slide 11 slidably installed on the lifting screw 10, a two-axis fine-tuning platform 12 fixedly installed on the top of the lifting slide 11, and an air-floating rotary turntable 13 fixedly installed on the top of the two-axis fine-tuning platform 12. The heavy lifting drive mechanism (lifting base 7 and lifting screw 10) is detached from the rotating parts and placed below the turntable and above the fixed base.

[0032] Reference Figure 2 The two-axis fine-tuning platform 12 includes a base plate 14. A pair of transverse lead screws 15 are fixedly installed on the top of the base plate 14 at both ends of one diagonal. Each transverse lead screw 15 has a slidable transverse slider 19. A first slider 24 is vertically installed on the top of each transverse slider 19. A pair of longitudinal lead screws 17 are fixedly installed on the top of the base plate 14 at both ends of the other diagonal. Each longitudinal lead screw 17 has a slidable longitudinal slider 23. A second slider 25 is horizontally installed on the top of each longitudinal slider 23. A top plate 20 is fixedly installed on the top of the first slider 24 and the second slider 25. The independently configured two-axis (XY direction) fine-tuning platform 12, through four small-stroke lead screw pairs (two transverse and two longitudinal) and cross-arranged sliders, constitutes a high-rigidity, low-moment-of-motion precision adjustment unit. Its "diagonal arrangement" structure helps to counteract the torque during movement, reduce the platform's sway and deflection during fine-tuning, and ensure the flatness and linearity of the top plate 20 (i.e., the turntable mounting surface). This enables the workpiece to be positioned accurately and quickly at the sub-millimeter level relative to the X-ray source and detector 3, solving the problem of low positioning efficiency in the background art (2), without having to move the entire heavy, long-stroke stage 5.

[0033] A protrusion 31 is provided on the top of the transverse slider 19, and a first slider 24 is provided on the top of the protrusion 31. The first slider 24 is a C-shaped block, and a receiving groove 26 is formed between the outer wall of the protrusion 31 and the inner wall of the C-shaped block. A transverse guide shaft 28 is provided in the receiving groove 26. This structure provides a second guiding and constraint mechanism for the transverse moving component. The transverse lead screw 15 provides the main drive and unidirectional guidance. The combination of "protrusion-C-shaped block-transverse guide shaft 28" here forms a closed or semi-closed frame structure, which can effectively resist lateral forces and torques from the workpiece or external interference. The enveloping design of the C-shaped block can be pre-tightened to eliminate the gap in the kinematic pair and ensure that the transverse slider 19 moves accurately without shaking under the drive of the lead screw. The guide shaft ensures the straightness of the motion trajectory and prevents the slider from lifting or twisting during movement, thereby improving the repeatability and smoothness of the fine-tuning platform.

[0034] A protrusion is provided on the top of the longitudinal slider 23, and a second slider 25 is provided on the top of the protrusion. The second slider 25 is a C-shaped block. A receiving groove 26 is formed between the outer wall of the protrusion and the inner wall of the C-shaped block. A longitudinal guide shaft 27 is provided in the receiving groove 26, which ensures that the vertical movement and the horizontal movement have the same high rigidity and zero-backlash accuracy. This makes the two-axis fine-tuning platform 12 have extremely high stability in any movement in the XY plane, providing a double guarantee for the final accurate positioning of the workpiece.

[0035] The center axis of the transverse lead screw 15 is perpendicular to the center axis of the longitudinal lead screw 17, ensuring that the axes of the transverse (X-direction) and vertical (Y-direction) lead screws are perpendicular to each other. The operator or control system can independently control the X or Y direction movement without generating unnecessary motion (for example, when only the X direction is moved, the Y coordinate will not change). This greatly simplifies the control logic and improves the intuitiveness and efficiency of the positioning operation.

[0036] A horizontal motor 16 is installed at one end of the horizontal lead screw 15, and a vertical motor 18 is installed at one end of the vertical lead screw 17. Each fine-tuning axis is equipped with an independent servo motor or stepper motor, realizing the electrification of fine-tuning motion. Operators do not need to operate manually. They can issue precise displacement commands through the existing control system. The accuracy is much higher than manual adjustment. It is also easy to integrate into the automated scanning process to realize automatic calibration and sequential scanning of workpiece position, which greatly improves detection efficiency and consistency.

[0037] A turntable base 21 is fixedly mounted on the top of the fine-tuning platform 12. A table surface 22 is provided on the top of the turntable base 21. The turntable base 21 serves as a robust transition structure, providing a large-area, highly flat, and highly rigid mounting reference surface for the air-bearing rotary turntable 13. This ensures that the base of the turntable is not affected by minor deformations of the top plate 20 of the fine-tuning platform 12, guaranteeing the rotational accuracy of the turntable itself. The table surface 22 is used for directly mounting workpieces or tooling fixtures.

[0038] The slider base 30 has a groove 29 corresponding to the lifting slide 11. The width of the groove 29 is greater than the width of the lifting slide 11. This groove 29 design ensures that the lifting slide 11 has sufficient movement clearance within the vertical lifting stroke, preventing any form of scraping or collision interference between the lifting slide 11 and the fixed slider base 30 during the movement. Sufficient clearance is a prerequisite for ensuring smooth lifting movement without friction or jamming, avoiding additional resistance, vibration or even equipment damage caused by structural interference, thereby ensuring the stability and positioning accuracy of Z-axis lifting.

[0039] A motor 9 is installed at the bottom of the lifting screw 10. The motor 9 is a servo motor, which is integrated into the bottom of the lifting screw 10, realizing electric drive and precise control of the lifting motion. This allows the height of the entire stage device to be automatically adjusted as needed, such as quickly descending to facilitate loading and unloading, or accurately rising to the scanning start height, completely avoiding the inconvenience and inefficiency of manual lifting, and is a key link in realizing a fully automated CT scanning workflow.

[0040] Reference Figure 3 This design defines the final application scenario and spatial relationship of the CT stage 5 within the entire industrial CT system. The transverse slider 6 is slidably mounted on the transverse guide rail 2, which is mounted on the base 1. The transverse slider 6 and the guide rail form the basis for the entire device to move over a wide range in the X direction (or another horizontal direction). The X-axis is responsible for quickly moving the workpiece to the approximate field of view of the optomechanical system 4, solving the problem of lateral adjustment relying solely on moving the entire heavy stage in the prior art. It has a large stroke, but its accuracy requirements are relatively lower than those of the fine-tuning platform 12, achieving a reasonable balance between function and cost.

[0041] An optical engine 4 is installed on one side of the air-bearing rotary stage 13, using an existing optical engine 4, and a detector 3 is installed on the other side of the air-bearing rotary stage 13, using an existing detector 4. This allows for efficient and accurate positioning of the workpiece to the center of the X-ray beam (rotation center), thereby obtaining high-resolution, artifact-free CT reconstruction images.

[0042] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A CT object table, characterized in that, The system includes a slider base, a lifting base fixedly installed below the slider base, a lifting screw set at the center of the lifting base, a transverse slider set below the slider base and away from the screw, a lifting slide table slidably installed on the lifting screw, a two-axis fine-tuning platform fixedly installed on the top of the lifting slide table, and an air-floating rotary table fixedly installed on the top of the two-axis fine-tuning platform. The two-axis fine-tuning platform includes a base plate, on the top of the base plate and at both ends of one diagonal, a pair of horizontal lead screws are fixedly installed, each horizontal lead screw is slidably provided with a horizontal slider, and a first slider is vertically provided on the top of the horizontal slider. On the top of the base plate and at both ends of the other diagonal, a pair of vertical lead screws are fixedly installed, each vertical lead screw is slidably provided with a vertical slider, and a second slider is horizontally provided on the top of the vertical slider. A top plate is fixedly installed on the top of the first slider and the second slider.

2. The CT object table of claim 1, wherein, A protrusion is provided on the top of the horizontal slider, and a first slider is provided on the top of the protrusion. The first slider is a C-shaped block. A receiving groove is formed between the outer wall of the protrusion and the inner wall of the C-shaped block, and a horizontal guide shaft is provided in the receiving groove.

3. The CT stage according to claim 1, characterized in that, A protrusion is provided on the top of the longitudinal slider, and a second slider is provided on the top of the protrusion. The second slider is a C-shaped block. A receiving groove is formed between the outer wall of the protrusion and the inner wall of the C-shaped block, and a longitudinal guide shaft is provided in the receiving groove.

4. The CT object table of claim 1, wherein, The center axis of the transverse lead screw is perpendicular to the center axis of the longitudinal lead screw.

5. The CT object table of claim 1, wherein, A horizontal motor is installed at one end of the horizontal lead screw, and a vertical motor is installed at one end of the vertical lead screw.

6. The CT object table of claim 1, wherein, The top of the fine-tuning platform is fixedly mounted on a turntable base, and the top of the turntable base is provided with a platform.

7. The CT object table of claim 1, wherein, The slider base has a groove corresponding to the lifting slide, and the width of the groove is greater than the width of the lifting slide.

8. The CT object table of claim 1, wherein, A motor is installed at the bottom of the lifting screw.

9. The CT object table of claim 1, wherein, The transverse slider is slidably mounted on the transverse guide rail, which is mounted on the base.

10. The CT object table of claim 1, wherein, An optical engine is installed on one side of the air-bearing rotary turntable, and a detector is installed on the other side of the air-bearing rotary turntable.

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