Novel CT laser lamp calibration mechanism
Through the design of the base and laser lamp fixing frame, two sets of adjustment screws are used to achieve 2 degrees of freedom adjustment, which solves the problem of instability in the accuracy caused by centrifugal force and eccentric mass during high-speed rotation of the CT laser lamp, improves the accuracy of scanning and reduces production costs.
Patent Information
- Application Number
- CN202421800190.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The existing CT laser lamp calibration mechanism is prone to self-excitation vibration due to centrifugal force and eccentric mass during high-speed rotation, resulting in unstable accuracy and loose structure, and the adjustment range is small, making it difficult to meet the requirements of high accuracy and high reliability.
The design of the base and laser lamp fixing frame is adopted, and the two sets of adjustment screws are used to achieve tilt 2 degrees of freedom adjustment, ensuring that the optical path is in the correct position of the test tool, the structure is simple and the use of coronal, sagittal and cross-sections can be achieved, which improves the reuse rate of production tissue and reduces costs.
High-precision adjustment of laser lamps is realized, the accuracy and reliability of scanning is improved, the adjustment process is simplified, and the production cost is reduced.
Smart Images
Figure CN223208429U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of computer tomography, in particular to a novel CT laser lamp calibration mechanism. Background Art
[0002] Before the patient is scanned, the gantry's laser positioning light is used to position the patient in the coronal, sagittal, and transverse planes according to the scanning protocol. This calibrates the patient's position on the gantry in three dimensions. This ensures that the radiographic scan is completed accurately and that the scanned area is clearly depicted on the film. With patient-centricity in mind, the laser light must exhibit stable performance and high reliability.
[0003] For the product, the laser light aligns and calibrates the center point (ISO) of the scanning frame, providing an angular magnification effect. This results in a narrow adjustment range and sensitivity to precision variations. Furthermore, during high-speed rotation of the frame, self-excited vibrations caused by centrifugal force or eccentric mass interfere with stable precision. Therefore, laser positioning lights must be accurately installed, maintain high reliability, and be easily adjusted during subsequent maintenance.
[0004] Current laser adjustment frames mostly use a rod-type joint adjustment method, which has a wide range of freedom of movement, a bulky structure, and poor precision retention. The main structure consists of a base connected to a lower column, which is hingedly connected to an upper column. The upper column is hinged and rotated and connected to the laser platform, achieving two degrees of freedom of rotation adjustment. The spatial position and angle of the laser head are determined by clamping and friction. The centrifugal force generated during high-speed rotation and the self-excited vibration caused by the eccentric mass can easily cause precision disturbances and structural loosening, which means that there are problems with performance stability and structural reliability. For example, patent CN211717761U describes a laser lamp head calibration and adjustment device. Utility Model Content
[0005] In order to solve the defects and shortcomings of the above-mentioned prior art, the utility model provides a new CT laser lamp calibration mechanism that can achieve 2-degree-of-freedom adjustment of tilt through two sets of adjustment screws to ensure that the optical path is in the correct position of the inspection fixture. It has a simple structure and is easy to adjust. It can realize the multi-use of coronal plane, sagittal plane and transverse plane, and has a high reuse rate in production organization, thereby improving efficiency and reducing costs.
[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a novel CT laser lamp calibration mechanism, comprising a base and a laser lamp fixing frame, wherein the lower portion of the base is provided with a transverse slot and a transverse slot adjustment screw for adjusting the size of the transverse slot, and one end of the transverse slot is provided with a transverse through hole, and the upper portion of the base is provided with a vertical slot and a vertical slot adjustment screw for adjusting the size of the vertical slot, and one end of the vertical slot is provided with a vertical through hole;
[0007] A vertical fixing plate is provided on one side of the laser lamp fixing frame. The vertical fixing plate is fixed to the upper movable side of the base through a first fixing screw. An auxiliary top screw is provided between the vertical fixing plate and the upper part of the base.
[0008] Preferably, the adjustment width of the transverse slots and the vertical slots is 5 mm, and the transverse through holes and the vertical through holes are both circular holes with a diameter of 10 mm.
[0009] Preferably, a first adjustment hole for matching with a transverse slotted adjustment screw is provided at one end of the lower portion of the base, and a second adjustment hole for matching with a vertical slotted adjustment screw is provided at the upper portion of the base.
[0010] Preferably, the upper portion of the base is provided with a first fixing hole for cooperating with a first fixing screw and a jackscrew hole for cooperating with an auxiliary jackscrew.
[0011] Preferably, a mounting base plate is provided at the bottom of the base, and mounting holes are provided at both ends of the mounting base plate.
[0012] Preferably, a mounting step is provided on one side of the bottom of the base, and the mounting step is fixed to the mounting base plate by a second fixing screw, and a second fixing hole matching the second fixing screw is provided on the mounting base plate and the mounting step.
[0013] Preferably, the laser lamp fixing bracket includes a fixing base plate and a fixing block, and locking screws for locking the fixing block and the laser lamp on the fixing base plate.
[0014] The utility model can realize two-degree-of-freedom adjustment of the tilt through two sets of adjustment screws, ensuring that the optical path is in the correct position of the inspection fixture. It has a simple structure and is easy to adjust. It can realize the multiple use of the coronal plane, sagittal plane and cross-section, and has a high reuse rate in production organization, thereby improving efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic structural diagram of one angle of the present invention;
[0016] Figure 2 This is a structural diagram of the utility model from another angle;
[0017] Figure 3 This is a schematic diagram of the structure of the base of the utility model;
[0018] Figure 4 This is a schematic diagram of the structure of the laser light fixing frame of the utility model;
[0019] Figure 5 This is a schematic diagram of the theoretical calculation of deformation values for this utility model;
[0020] Figure 6 This is the adjustment principle diagram of the laser light in this utility model;
[0021] Among them: 1. Base, 2. Laser light fixing bracket, 3. Horizontal slot, 4. Horizontal through hole, 5. Vertical slot, 6. Vertical through hole, 7. Horizontal slot adjustment screw, 8. Vertical slot adjustment screw, 9. Vertical fixing plate, 10. First fixing screw, 11. Auxiliary top screw, 12. First adjustment hole, 13. Second adjustment hole, 14. First fixing hole, 15. Top screw hole, 16. Mounting base, 17. Mounting hole, 18. Mounting step, 19. Second fixing screw, 20. Fixed base, 21. Fixing block, 22. Locking screw, 23. Second fixing hole. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1
[0023] See also Figure 1-4 A novel CT laser lamp calibration mechanism includes a base 1 and a laser lamp fixing frame 2, characterized in that: a horizontal slot 3 and a horizontal slot adjustment screw 7 for adjusting the opening and closing size of the horizontal slot 3 are provided at the lower portion of the base 1, a horizontal through hole 4 is provided at one end of the horizontal slot 3, a vertical slot 5 and a vertical slot adjustment screw 8 for adjusting the opening and closing size of the vertical slot 5 are provided at the upper portion of the base 1, and a vertical through hole 6 is provided at one end of the vertical slot 5;
[0024] A vertical fixing plate 9 is provided on one side of the laser lamp fixing frame 2 , and the vertical fixing plate 9 is fixed to the upper movable side of the base 1 by a first fixing screw 10 . An auxiliary top screw 11 is provided between the vertical fixing plate 9 and the upper part of the base 1 .
[0025] The adjustment width of the transverse slot 3 and the vertical slot 5 is 5 mm, and the transverse through hole 4 and the vertical through hole 6 are both circular holes with a diameter of 10 mm.
[0026] A first adjustment hole 12 is provided at one end of the lower portion of the base 1 to match the transverse slotted adjustment screw 7 , and a second adjustment hole 13 is provided at the upper portion of the base 1 to match the vertical slotted adjustment screw 8 .
[0027] The upper portion of the base 1 is provided with a first fixing hole 14 for matching with the first fixing screw 10 and a jackscrew hole 15 for matching with the auxiliary jackscrew 11 .
[0028] A mounting base plate 16 is provided at the bottom of the base 1 , and mounting holes 17 are provided at both ends of the mounting base plate 16 .
[0029] A mounting step 18 is provided on one side of the bottom of the base 1 , and the mounting step 18 is fixed to the mounting base plate 16 by a second fixing screw 19 . A second fixing hole 23 matching the second fixing screw 19 is provided on the mounting base plate 16 and the mounting step 18 .
[0030] The laser lamp fixing frame 2 includes a fixing base plate 20 , a fixing block 21 , and locking screws 22 for locking the fixing block 21 and the laser lamp on the fixing base plate 20 . Example 2
[0031] This utility model adopts 65Mn quenching and tempering heat treatment, takes ¢10 as the rotation axis (the diameter of the horizontal through hole and the vertical through hole is 10mm), and slots 5mm as the adjustment width (the adjustment width of the horizontal slots and the vertical slots is 5mm), to achieve two degrees of freedom adjustment of the tilt of the laser light. Figure 5 The adjustment amount at the center can be calculated. The vertical slotted adjustment screw is used to adjust the laser light. After the laser position is determined, the auxiliary screw is used to ensure the stability and reliability of the mechanism.
[0032] The working principle of this utility model is as follows: two circular through holes serve as the rotation axis, the material opening releases the internal tensile stress, and the structure shows an expansion of the opening angle. The elastic coefficient is calculated by actual measurement or finite element analysis, and the deformation amount can be controlled by controlling the torque of the screw. The structure realizes the small outward deformation of the material and the compression adjustment of the fine thread, and accurately controls the angle scaling effect of the scanning frame center. Figure 5 The geometric relationship can be used to calculate the adjustment amount at the center.
[0033] like Figure 6 As shown, this utility model takes into account the application conditions of the laser positioning light and ensures the spatial relationship between the laser fan and the scanning frame. Two of the six degrees of freedom (degrees of freedom) in space can be adjusted, including tilt. Two-way translational adjustment of spatial positioning is achieved by utilizing clearances between screw holes. The mounting surface is secured with two screws.
[0034] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A novel CT laser lamp calibration mechanism, comprising a base (1) and a laser lamp fixing frame (2), characterized in that: The lower portion of the base (1) is provided with a transverse slot (3) and a transverse slot adjustment screw (7) for adjusting the size of the transverse slot (3); one end of the transverse slot (3) is provided with a transverse through hole (4); the upper portion of the base (1) is provided with a vertical slot (5) and a vertical slot adjustment screw (8) for adjusting the size of the vertical slot (5); one end of the vertical slot (5) is provided with a vertical through hole (6); A vertical fixing plate (9) is provided on one side of the laser light fixing frame (2); the vertical fixing plate (9) is fixed to the upper movable side of the base (1) via a first fixing screw (10); an auxiliary top screw (11) is provided between the vertical fixing plate (9) and the upper part of the base (1).
2. The novel CT laser lamp calibration mechanism according to claim 1, characterized in that: The adjustment width of the transverse slot (3) and the vertical slot (5) is 5 mm, and the transverse through hole (4) and the vertical through hole (6) are both circular holes with a diameter of 10 mm.
3. The novel CT laser lamp calibration mechanism according to claim 1, characterized in that: A first adjustment hole (12) is provided at one end of the lower portion of the base (1) to match the transverse slotted adjustment screw (7), and a second adjustment hole (13) is provided at the upper portion of the base (1) to match the vertical slotted adjustment screw (8).
4. The novel CT laser lamp calibration mechanism according to claim 1, characterized in that: The upper portion of the base (1) is provided with a first fixing hole (14) for cooperating with a first fixing screw (10) and a top screw hole (15) for cooperating with an auxiliary top screw (11).
5. The novel CT laser lamp calibration mechanism according to claim 1, characterized in that: A mounting base plate (16) is provided at the bottom of the base (1), and mounting holes (17) are provided at both ends of the mounting base plate (16).
6. The novel CT laser lamp calibration mechanism according to claim 5, characterized in that: A mounting step (18) is provided on one side of the bottom of the base (1), and the mounting step (18) is fixed to the mounting base plate (16) by a second fixing screw (19). A second fixing hole (23) matching the second fixing screw (19) is provided on the mounting base plate (16) and the mounting step (18).
7. The novel CT laser lamp calibration mechanism according to claim 1, characterized in that: The laser lamp fixing frame (2) comprises a fixing base plate (20), a fixing block (21), and a locking screw (22) for locking the fixing block (21) and the laser lamp on the fixing base plate (20).