Automatic centering device for a laser particle size analyzer

Abstract

The utility model discloses an automatic centering device of laser particle size appearance, including first machine base, second machine base, horizontal adjusting mechanism, vertical adjusting mechanism, laser generating subassembly, focusing optical system, detector ontology and image detector. Horizontal adjusting mechanism drives first slide horizontal movement through first servo motor and horizontal adjusting screw, and vertical adjusting mechanism drives second slide vertical movement through second servo motor and vertical adjusting screw, thereby drive laser generating subassembly to adjust the beam position in horizontal and vertical direction. After the convergence of beam through focusing optical system, pass through the center small hole of detector ontology, and the facula image is gathered by image detector. Image processing system recognizes facula center deviation according to image signal, and controls horizontal and vertical adjusting mechanism to realize the automatic closed loop centering of beam center. The utility model is based on the feedback regulation of actual facula image, has the advantages of high centering precision, wide adaptation range and good stability.

Description

Technical Field

[0001] This utility model relates to the field of laser particle size analyzer technology, specifically to an automatic centering device for a laser particle size analyzer. Background Technology

[0002] In laser particle size analyzers, the alignment accuracy of the laser beam directly affects the accuracy and stability of the test results. Current technology typically employs photosensitive elements around the detector's light-facing surface in conjunction with four-quadrant elements for beam center detection and adjustment.

[0003] However, the light signal around the central aperture of the detector is weak, which limits the adjustment accuracy. Especially when the optical path is changed due to transportation or use, or when the distance between the detector and the laser needs to be adjusted, the existing method is difficult to achieve fast and accurate alignment.

[0004] Therefore, we need an automatic centering device for laser particle size analyzers that has a reasonable structure, high adjustment accuracy, and wide applicability. Utility Model Content

[0005] The purpose of this invention is to provide an automatic centering device for a laser particle size analyzer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic centering device for a laser particle size analyzer, comprising a first base, a second base, a horizontal adjustment mechanism, a vertical adjustment mechanism, a laser generating component, a focusing optical system, a detector body, and an image detector; The horizontal adjustment mechanism includes a horizontal base, a first sliding plate, and a first reciprocating push plate. The horizontal base is fixedly connected to the upper surface of the first base. The first sliding plate is slidably connected to the horizontal base. The first reciprocating push plate is fixedly connected to the side of the first sliding plate to push the first sliding plate to move back and forth, so as to realize the horizontal translation of the laser beam of the laser generating component. The vertical adjustment mechanism includes a support rod, a vertical base, a second sliding plate, and a second reciprocating push plate. The bottom of the support rod is fixedly connected to the upper surface of the first sliding plate, the vertical base is fixedly connected to the surface of the support rod, the second sliding plate is slidably connected to the vertical base, and the second reciprocating push plate is fixedly connected to the side of the second sliding plate to push the second sliding plate to move up and down, so as to realize the movement of the beam in the vertical direction. The laser generating component is fixedly connected to the second reciprocating push plate of the vertical adjustment mechanism via a connecting rod; The focusing optical system, detector body, and image detector are sequentially fixed on the second base. A small hole is provided in the center of the detector body. After the light beam is focused by the focusing optical system, it is projected onto the image detector through the small hole. The image detector is connected to the image processing system. The image processing system controls the horizontal adjustment mechanism and the vertical adjustment mechanism according to the received light spot image signal to realize the automatic adjustment of the beam center.

[0007] Preferably, when the beam is parallel light, it needs to be converged by a focusing optical system; when the beam is converging light, it does not need a focusing optical system and is directly projected onto the image detector through a small hole in the center of the detector body.

[0008] Preferably, the horizontal adjustment mechanism further includes a first servo motor and a horizontal adjustment screw. The first servo motor is fixedly mounted on the first base via a motor support plate and is electrically connected to the image processing system. The horizontal adjustment screw is drivenly connected to the output end of the first servo motor and is threadedly connected to the first reciprocating push plate.

[0009] Preferably, a first stabilizing plate is fixedly connected to the surface of the first base, and the end of the horizontal adjusting screw is rotatably connected to the surface of the first stabilizing plate.

[0010] Preferably, the vertical adjustment mechanism further includes a second servo motor and a vertical adjustment screw. The second servo motor is fixedly connected to the support rod via a motor support plate and is electrically connected to the image processing system. The vertical adjustment screw is drivenly connected to the output end of the second servo motor and is threadedly connected to the second reciprocating push plate.

[0011] Preferably, a second stabilizing plate is fixedly connected to the surface of the support rod, and the end of the vertical adjusting screw is rotatably connected to the surface of the second stabilizing plate.

[0012] Preferably, the focusing optical system, detector body, and image detector can be fixedly mounted on the second base by bolts or snap-fit.

[0013] Beneficial effects This invention provides an automatic centering device for a laser particle size analyzer, which has the following advantages: The automatic centering device of this laser particle size analyzer adjusts the center by acquiring an image of the actual light spot after passing through the small hole in the center of the detector body. This image contains all the information about the light quality of the beam and the deviation from the center, thereby achieving a wider range of adjustments with higher precision. This overcomes the problems of weak light signal and insufficient adjustment accuracy in traditional methods, and improves the testing stability and ease of operation of the instrument.

[0014] The automatic centering device of this laser particle size analyzer, by setting up a horizontal base, a first sliding plate, a first servo motor, and a horizontal adjusting screw, uses the first servo motor to drive the horizontal adjusting screw to rotate, and the horizontal base to limit the first sliding plate, which can make the horizontal translation of the laser beam of the laser generating component more stable. Similarly, by setting up a vertical base, a second sliding plate, a second servo motor, and a vertical adjusting screw, uses the second servo motor to drive the vertical adjusting screw to rotate, and the vertical base to limit the second sliding plate, which can make the vertical translation of the laser beam of the laser generating component more stable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an automatic centering device for a laser particle size analyzer proposed in this utility model. Figure 2 This is a three-dimensional structural diagram of the horizontal adjustment mechanism of the automatic centering device for a laser particle size analyzer proposed in this utility model. Figure 3 This is a three-dimensional structural diagram of the vertical adjustment mechanism of the automatic centering device for a laser particle size analyzer proposed in this utility model. Figure 4 This is a three-dimensional structural diagram of the detector body of the automatic centering device for a laser particle size analyzer proposed in this utility model.

[0016] In the diagram: 1. First base; 2. Second base; 3. Horizontal adjustment mechanism; 4. Vertical adjustment mechanism; 5. Laser generating assembly; 6. Focusing optical system; 7. Detector body; 8. Image detector; 9. Horizontal base; 10. First sliding plate; 11. First reciprocating push plate; 12. Support rod; 13. Vertical base; 14. Second sliding plate; 15. Second reciprocating push plate; 16. Connecting rod; 17. Small hole; 18. Image processing system; 19. First servo motor; 20. Horizontal adjustment screw; 21. First stabilizing plate; 22. Second servo motor; 23. Vertical adjustment screw; 24. Second stabilizing plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Please see Figure 1-4 This utility model provides a technical solution: an automatic centering device for a laser particle size analyzer, comprising a first base 1, a second base 2, a horizontal adjustment mechanism 3, a vertical adjustment mechanism 4, a laser generating component 5, a focusing optical system 6, a detector body 7, and an image detector 8; The horizontal adjustment mechanism 3 includes a horizontal base 9, a first sliding plate 10, and a first reciprocating push plate 11. The horizontal base 9 is fixedly connected to the upper surface of the first base 1. The first sliding plate 10 is slidably connected to the horizontal base 9. The first reciprocating push plate 11 is fixedly connected to the side of the first sliding plate 10 to push the first sliding plate 10 to move back and forth, so as to realize the translation of the beam of the laser generating component 5 in the horizontal direction. The vertical adjustment mechanism 4 includes a support rod 12, a vertical base 13, a second slide plate 14, and a second reciprocating push plate 15. The bottom of the support rod 12 is fixedly connected to the upper surface of the first slide plate 10. The vertical base 13 is fixedly connected to the surface of the support rod 12. The second slide plate 14 is slidably connected to the vertical base 13. The second reciprocating push plate 15 is fixedly connected to the side of the second slide plate 14 to push the second slide plate 14 to move up and down, so as to realize the movement of the beam in the vertical direction. The laser generating component 5 is fixedly connected to the second reciprocating push plate 15 of the vertical adjustment mechanism 4 via the connecting rod 16; The focusing optical system 6, the detector body 7, and the image detector 8 are sequentially fixed on the second base 2. The detector body 7 has a small hole 17 in the center. After the beam is focused by the focusing optical system 6, it is projected onto the image detector 8 through the small hole 17. The image detector 8 is connected to the image processing system 18. The image processing system 18 controls the horizontal adjustment mechanism 3 and the vertical adjustment mechanism 4 according to the received light spot image signal to realize the automatic adjustment of the beam center.

[0022] When the beam is parallel, it needs to be converged by the focusing optical system 6; when the beam is converged, it does not need the focusing optical system 6 and is directly projected onto the image detector 8 through the small hole 17 in the center of the detector body 7.

[0023] By acquiring an actual light spot image after passing through the small hole 17 at the center of the detector body 7, the centering adjustment is performed. This image contains all the information about the light quality of the beam and the deviation from the center, thereby achieving a wider range of adjustments with higher precision. This overcomes the problems of weak light signal and insufficient adjustment precision in traditional methods, and improves the testing stability and ease of operation of the instrument.

[0024] The horizontal adjustment mechanism 3 also includes a first servo motor 19 and a horizontal adjustment screw 20. The first servo motor 19 is fixedly mounted on the first base 1 through a motor support plate and is electrically connected to the image processing system 18. The horizontal adjustment screw 20 is drivenly connected to the output end of the first servo motor 19 and is threadedly connected to the first reciprocating push plate 11.

[0025] By setting up a horizontal base 9, a first sliding plate 10, a first servo motor 19, and a horizontal adjusting screw 20, the first servo motor 19 drives the horizontal adjusting screw 20 to rotate, and the horizontal base 9 limits the movement of the first sliding plate 10, making the horizontal translation of the laser beam from the laser generating component 5 more stable. A first stabilizing plate 21 is also fixedly connected to the surface of the first base 1, and the end of the horizontal adjusting screw 20 is rotatably connected to the surface of the first stabilizing plate 21. By setting the first stabilizing plate 21, the horizontal adjusting screw 20 can rotate more stably.

[0026] The vertical adjustment mechanism 4 also includes a second servo motor 22 and a vertical adjustment screw 23. The second servo motor 22 is fixedly connected to the support rod 12 through a motor support plate, and the second servo motor 22 is electrically connected to the image processing system 18. The vertical adjustment screw 23 is drivenly connected to the output end of the second servo motor 22, and the vertical adjustment screw 23 is threadedly connected to the second reciprocating push plate 15.

[0027] By setting up a vertical base 13, a second slide plate 14, a second servo motor 22, and a vertical adjustment screw 23, the second servo motor 22 drives the vertical adjustment screw 23 to rotate, and the vertical base 13 limits the second slide plate 14, which can make the vertical translation of the laser beam of the laser generating component 5 more stable.

[0028] The surface of the support rod 12 is also fixedly connected to a second stabilizing plate 24, and the end of the vertical adjusting screw 23 is rotatably connected to the surface of the second stabilizing plate 24. By setting the second stabilizing plate 24, the vertical adjusting screw 23 can rotate more stably.

[0029] The focusing optical system 6, the detector body 7, and the image detector 8 can be fixedly mounted on the second base 2 by bolts or snap-fit. This design facilitates the disassembly or maintenance of the focusing optical system 6, the detector body 7, and the image detector 8.

[0030] Working principle: The core principle of this automatic alignment device lies in acquiring and analyzing the actual light spot image after passing through the central aperture 17 of the detector body 7, thereby driving the first servo motor 19 and the second servo motor 22 in real time to achieve closed-loop feedback and automatic alignment of the light beam. Its specific workflow is as follows: Optical path signal acquisition: The light beam emitted by the laser generating component 5, whether it is parallel or convergent, will eventually converge into a single point of light and pass through the precision aperture 17 at the center of the detector body 7.

[0031] The light spot passing through the aperture 17 is completely captured by the image detector 8 (such as a CCD or CMOS sensor) behind it. This light spot image contains information about the energy distribution, shape, and most importantly, the deviation of the center position of the light spot.

[0032] Image processing and bias judgment: The image detector 8 transmits the acquired spot image signal to the image processing system 18 (usually a connected computer).

[0033] The image processing system 18 performs real-time analysis of the spot image and accurately calculates the deviation and direction of the current spot center from the target surface center of the image detector 8 (i.e., the ideal alignment position) in the horizontal (X-axis) and vertical (Y-axis) directions through specific image algorithms (such as calculating the centroid or geometric center of the spot).

[0034] Closed-loop control and execution adjustment: The image processing system 18 generates corresponding control commands based on the calculated deviation and sends them to the first servo motor 19 and the second servo motor 22, respectively.

[0035] Horizontal adjustment: The system controls the first servo motor 19 to work and the horizontal adjustment screw 20 to rotate. The horizontal adjustment screw 20 is threadedly connected to the first reciprocating push plate 11, which drives the first slide plate 10 of the horizontal adjustment mechanism 3 to move back and forth, thereby driving the entire support rod 12 and the laser generating component 5 to translate in the horizontal plane and correct the horizontal deviation of the light spot.

[0036] Vertical adjustment: The system controls the second servo motor 22 to work and the vertical adjustment screw 23 to rotate. The vertical adjustment screw 23 is threadedly connected to the second reciprocating push plate 15, which drives the second slide plate 14 of the vertical adjustment mechanism 4 to move up and down. In turn, the connecting rod 16 drives the laser generating component 5 to move vertically, correcting the vertical deviation of the light spot.

[0037] Iterative optimization until centering is complete: The above adjustment is a dynamic, continuous closed-loop process. Each time a fine-tuning is performed, the image detector 8 acquires a new spot image, and the system recalculates the new center deviation.

[0038] This feedback and continuous correction continues until the center of the light spot is adjusted to the center of the target surface of the image detector 8, indicating that the beam has been precisely aligned. At this point, the center of the beam passes precisely through the optimal range of the central aperture 17 of the detector body 7. The system then stops driving the servo motor, completing the entire automatic alignment process.

[0039] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic centering device for a laser particle size analyzer, characterized in that, It includes a first base (1), a second base (2), a horizontal adjustment mechanism (3), a vertical adjustment mechanism (4), a laser generating assembly (5), a focusing optical system (6), a detector body (7), and an image detector (8); The horizontal adjustment mechanism (3) includes a horizontal base (9), a first sliding plate (10) and a first reciprocating push plate (11). The horizontal base (9) is fixedly connected to the upper surface of the first base (1). The first sliding plate (10) is slidably connected to the horizontal base (9) and the first reciprocating push plate (11) is fixedly connected to the side of the first sliding plate (10) to push the first sliding plate (10) to move back and forth, so as to realize the translation of the beam of the laser generating component (5) in the horizontal direction. The vertical adjustment mechanism (4) includes a support rod (12), a vertical base (13), a second sliding plate (14), and a second reciprocating push plate (15). The bottom of the support rod (12) is fixedly connected to the upper surface of the first sliding plate (10). The vertical base (13) is fixedly connected to the surface of the support rod (12). The second sliding plate (14) is slidably connected to the vertical base (13). The second reciprocating push plate (15) is fixedly connected to the side of the second sliding plate (14) to push the second sliding plate (14) to move up and down, so as to realize the movement of the beam in the vertical direction. The laser generating assembly (5) is fixedly connected to the second reciprocating push plate (15) of the vertical adjustment mechanism (4) via a connecting rod (16); The focusing optical system (6), detector body (7) and image detector (8) are fixedly mounted on the second base (2) in sequence. The detector body (7) has a small hole (17) in the center. After the beam is focused by the focusing optical system (6), it is projected onto the image detector (8) through the small hole (17). The image detector (8) is connected to the image processing system (18). The image processing system (18) controls the horizontal adjustment mechanism (3) and the vertical adjustment mechanism (4) according to the received light spot image signal to realize the automatic adjustment of the beam center.

2. The automatic centering device for a laser particle size analyzer according to claim 1, characterized in that: When the beam is parallel light, it needs to be converged by the focusing optical system (6); when the beam is converged light, it does not need the focusing optical system (6) and is directly projected onto the image detector (8) through the small hole (17) in the center of the detector body (7).

3. The automatic centering device for a laser particle size analyzer according to claim 1, characterized in that: The horizontal adjustment mechanism (3) further includes a first servo motor (19) and a horizontal adjustment screw (20). The first servo motor (19) is fixedly mounted on the first base (1) through a motor support plate, and the first servo motor (19) is electrically connected to the image processing system (18). The horizontal adjustment screw (20) is drivenly connected to the output end of the first servo motor (19), and the horizontal adjustment screw (20) is threadedly connected to the first reciprocating push plate (11).

4. The automatic centering device for a laser particle size analyzer according to claim 3, characterized in that: The surface of the first base (1) is also fixedly connected to a first stabilizing plate (21), and the end of the horizontal adjusting screw (20) is rotatably connected to the surface of the first stabilizing plate (21).

5. The automatic centering device for a laser particle size analyzer according to claim 1, characterized in that: The vertical adjustment mechanism (4) further includes a second servo motor (22) and a vertical adjustment screw (23). The second servo motor (22) is fixedly connected to the support rod (12) through a motor support plate, and the second servo motor (22) is electrically connected to the image processing system (18). The vertical adjustment screw (23) is drivenly connected to the output end of the second servo motor (22), and the vertical adjustment screw (23) is threadedly connected to the second reciprocating push plate (15).

6. The automatic centering device for a laser particle size analyzer according to claim 5, characterized in that: The surface of the support rod (12) is also fixedly connected to a second stabilizing plate (24), and the end of the vertical adjusting screw (23) is rotatably connected to the surface of the second stabilizing plate (24).

7. The automatic centering device for a laser particle size analyzer according to claim 1, characterized in that: The focusing optical system (6), detector body (7) and image detector (8) can be fixedly installed on the second base (2) by bolts or snap-fit.

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