Liquid optical particle size instrument with adjustable optical path assembly for new chemical materials

Abstract

This invention discloses a liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly, relating to the field of liquid particle detection technology. It includes a housing and an optical path adjustment assembly. A base is fixedly installed at the bottom of the housing, and a pulsed laser is fixedly installed on one side of the base. The optical path adjustment assembly is located on the other side of the base and includes a gantry frame fixedly installed on the side of the base. This liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly achieves scanning of the pulsed laser spot in a two-dimensional plane by changing the deflection angle of the galvanometer. The focusing position of the spot is changed by switching the working position of the field lens. The cleaning mode can be seamlessly switched between detection modes. The thermal stress generated by laser irradiation achieves rapid and non-destructive cleaning of the optical window surface of the sample flow cell, resulting in both good cleaning effect and fast cleaning speed.

Description

Technical Field

[0001] This invention relates to the field of liquid particle detection technology, specifically to a liquid optical particle size analyzer for new chemical materials equipped with an adjustable optical path component. Background Technology

[0002] Liquid particle counters, as instruments for detecting the particle size distribution and quantity of tiny particles in liquid media, have wide applications in various fields such as semiconductors, filter testing, biopharmaceuticals, medical devices, and oil cleanliness testing. Currently, the main methods for detecting tiny particles in liquids include microscopic counting, Coulter method, and optical counting, among which optical liquid particle counters are the most widely used particle detection method.

[0003] For example, in the liquid particle detection and cleaning system and method disclosed in CN117554270A, the liquid particle detection and cleaning system can switch between detection and cleaning modes by changing the position of the reflector. It uses the thermal stress generated by laser irradiation to achieve rapid and non-destructive cleaning of the optical window surface of the sample flow cell, which not only has good cleaning effect but also fast cleaning speed. However, in the above technical solution, the first galvanometer box and the second galvanometer used to change the optical path are controlled by their respective rotational power separately. The synchronous movement of the two galvanometers requires complex electrical timing calibration and cannot be coordinated through mechanical structure. Moreover, the adjustment of the scene working position used to change the focus position of the light spot also requires the use of an independently driven moving platform. An additional independently driven moving platform and a position detection and control module are required to realize the switching of its working position. This design results in the entire system needing to integrate at least three independent power sources and supporting control circuits, which not only greatly increases the hardware cost and assembly complexity of the device, but also increases the probability of electromagnetic interference, circuit failure and other problems due to the increased number of electrical components, reducing the stability of the system in long-term operation. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid optical particle size analyzer for new chemical materials with adjustable optical path components, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly, comprising a housing and an optical path adjustment assembly. A base is fixedly installed at the bottom of the housing, and a pulsed laser is fixedly installed on one side of the base. The optical path adjustment assembly is located on the other side of the base. The optical path adjustment assembly includes a gantry frame fixedly installed on the side of the base. A bearing seat is fixedly installed at the top of the gantry frame, and a slotted swing arm is rotatably installed in the middle of the bearing seat via a shaft. A galvanometer is coaxially installed on the slotted swing arm via a shaft. A motor is fixedly installed on the side of the gantry frame, and a drive wheel is coaxially installed in the middle of the rotating end of the motor. A crank is coaxially installed at the tail of the rotating end of the motor, and a pin on the crank away from the center of rotation slides within a groove on the slotted swing arm.

[0006] Furthermore, a follow-up adjustment component is provided in the middle of the base. The follow-up adjustment component includes a shaft frame fixedly installed in the middle of the base. A double-headed rack is rotatably installed in the middle of the shaft frame, and the double-headed rack is composed of a bevel gear on one side and a gear on the other side coaxially.

[0007] Furthermore, the follow-up adjustment component also includes a sector gear disposed above one side of the double-ended rack gear end. The sector gear rotates to the bevel gear end on the other side through meshing with the double-ended rack gear end, and the rotation center of the sector gear is coaxially connected to the slotted swing arm and the galvanometer via a shaft.

[0008] Furthermore, the follow-up adjustment component also includes a bevel gear meshing and installed below one side of the double-headed toothed rod umbrella wheel end, with a second galvanometer mirror coaxially mounted in the middle of the bevel gear, and the second galvanometer mirror being perpendicular to the rotation axis of the first galvanometer mirror.

[0009] Furthermore, a focusing switching assembly is installed at the top of the gantry frame. The focusing switching assembly includes a support fixedly installed at the top of the gantry frame. A cam column is rotatably installed at the rear end of the support, and a driven wheel is coaxially connected to the end of the cam column. The driven wheel is driven by a synchronous belt to rotate with the drive wheel at the rotating end of the motor.

[0010] Furthermore, the focusing switching assembly also includes a ring pin fixedly installed on the outer circle of the cam column. Two telescopic rods are arranged parallel to each other along the axis at the upper and lower ends of the cam column, and the rear pin of the telescopic rod is slidably installed on the outer edge of the ring pin. The middle part of the telescopic rod is limited by the corresponding holes at both ends of the support.

[0011] Furthermore, the focusing switching assembly also includes field lenses fixedly connected to the front ends of the telescopic rods on both sides. There are two field lenses, which are respectively connected to the front ends of the corresponding telescopic rods, and the focal spot positions corresponding to the two field lenses are different when they are at different height positions.

[0012] Furthermore, a sample flow cell is installed at the top of the inner casing, and a semiconductor laser is provided on one side of the sample flow cell. A first mirror group is provided along the detection laser light path direction of the semiconductor laser.

[0013] Furthermore, a right-angle prism is provided between the first mirror group and the sample flow cell. In the detection mode, light is incident from the vertical plane of the right-angle prism and exits parallel to the inclined plane. In the cleaning mode, light is incident from the inclined plane of the right-angle prism and reflected at a 90-degree angle.

[0014] Furthermore, a second mirror group is provided on the other side of the sample flow cell, and both the second mirror group and the first mirror group are composed of collimating lenses and focusing lenses. The second mirror group is provided with an optical signal receiving module along the direction of the detection laser optical path, and the optical signal receiving module is electrically connected to the processor outside the housing.

[0015] This invention provides a liquid optical particle size analyzer for new chemical materials with adjustable optical path components, which has the following beneficial effects;

[0016] 1. This application achieves scanning of the pulsed laser spot in a two-dimensional plane by changing the deflection angle of the galvanometer, and then changes the focusing position of the spot by switching the working position of the field lens. The cleaning mode can be seamlessly switched between detection modes. The thermal stress generated by laser irradiation is used to achieve rapid and non-destructive cleaning of the surface of the optical window of the sample flow cell. It not only has a good cleaning effect, but also a fast cleaning speed.

[0017] 2. When this application is used, while ensuring that the rotation axis of the second galvanometer is perpendicular to that of the first galvanometer, the motion of the single power source is converted into the orthogonal and opposite swing of the two galvanometers. This retains the two-dimensional scanning capability of the original dual galvanometers and simplifies the control logic. The swing phase difference of the two galvanometers is set by the crank eccentric angle, so that the light spot covers the optical windows on both sides of the sample flow cell with a scanning trajectory superimposed by a two-dimensional sine curve.

[0018] 3. In use, this application changes the focusing position of the light spot by switching the two field lenses at different heights, thereby cleaning the optical window on the other side of the sample flow cell. This application replaces traditional electrical control with mechanical positioning, and achieves focusing switching through two fixed height levels to complete the cleaning of the optical windows on both sides of the sample flow cell. By sharing power, the system structure is simplified, and by timing coordination, the cleaning efficiency is improved. Ultimately, the entire device maintains the advantage of seamless switching between detection and cleaning while further reducing costs, improving reliability, and better adapting to the needs of industrial continuous detection scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0020] Figure 2This is a schematic diagram of the optical path in the cleaning mode of the device of the present invention;

[0021] Figure 3 This is a schematic diagram of the optical path for the detection mode of the device of the present invention;

[0022] Figure 4 This is a schematic diagram of part of the structure of the device of the present invention;

[0023] Figure 5 This is a schematic diagram of the follow-up adjustment component structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the optical path adjustment component structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the focusing switching component structure of the present invention.

[0026] In the diagram: 1. Housing; 2. Base; 3. Pulsed laser; 4. Optical path adjustment assembly; 401. Gantry frame; 402. Bearing seat; 403. Slotted swing arm; 404. Galvanometer mirror one; 405. Motor; 406. Drive wheel; 407. Crank; 5. Follow-up adjustment assembly; 501. Shaft bracket; 502. Double-ended rack; 503. Sector gear; 504. Bevel gear; 505. Galvanometer mirror two; 6. Focusing switching assembly; 601. Support; 602. Cam column; 603. Driven wheel; 604. Ring pin; 605. Telescopic rod; 606. Field lens; 7. Sample flow cell; 8. Semiconductor laser; 9. First mirror group; 10. Right angle prism; 11. Second mirror group; 12. Optical signal receiving module; 13. Processor. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] Please see Figures 4 to 6This invention provides a technical solution: a liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly, comprising a housing 1 and an optical path adjustment assembly 4. A base 2 is fixedly installed at the bottom of the housing 1, and a pulsed laser 3 is fixedly installed on one side of the base 2. The optical path adjustment assembly 4 is located on the other side of the base 2. The optical path adjustment assembly 4 includes a gantry frame 401 fixedly installed on the side of the base 2. A bearing seat 402 is fixedly installed at the top of the gantry frame 401, and a slotted swing arm 403 is rotatably mounted on the middle of the bearing seat 402 via a shaft. A galvanometer 404 is coaxially mounted on the slotted swing arm 403 via a shaft. A motor 405 is fixedly installed on the side of the gantry frame 401, and a drive wheel 406 is coaxially mounted on the middle of the rotating end of the motor 405. A crank 407 is coaxially mounted on the tail of the rotating end of the motor 405, and a pin on the crank 407 away from the rotation center is located on the slotted swing arm. The arm 403 slides within the groove. A follow-up adjustment component 5 is provided in the middle of the base 2. The follow-up adjustment component 5 includes a shaft frame 501 fixedly installed in the middle of the base 2. A double-headed rack 502 is rotatably installed in the middle of the shaft frame 501. The double-headed rack 502 is composed of a parapet wheel on one side and a gear on the other side coaxially. The follow-up adjustment component 5 also includes a sector gear 503 located above one side of the gear end of the double-headed rack 502. The sector gear 503 rotates to the parapet wheel end on the other side by meshing with the gear end of the double-headed rack 502. The rotation center of the sector gear 503 is coaxially connected to the slotted swing arm 403 and the first galvanometer 404 through a shaft. The follow-up adjustment component 5 also includes a bevel gear 504 meshing and installed below one side of the parapet wheel end of the double-headed rack 502. A second galvanometer 505 is coaxially installed in the middle of the bevel gear 504. The rotation axis of the second galvanometer 505 is perpendicular to that of the first galvanometer 404.

[0029] The specific operation is as follows: Motor 405 is activated, driving the crank 407, which is coaxial with the output shaft, to rotate. The sliding of the pin at the rotation center of crank 407 within the groove of the slotted rocker arm 403 converts the rotational motion of the motor 405 output shaft into the reciprocating oscillation of the slotted rocker arm 403. This not only drives the galvanometer 404, coaxial with the slotted rocker arm 403, to reciprocate, but also drives the sector gear 503, coaxial with the slotted rocker arm 403, to reciprocate. Furthermore, the meshing action between the sector gear 503 and the end of the double-ended gear 502 drives the double-ended gear... The bevel gear end of rod 502 rotates, and finally drives the second galvanometer 505 to swing back and forth under the meshing transmission of the bevel gear end of double-headed rod 502 and bevel gear 504. While ensuring that the rotation axis of the second galvanometer 505 is perpendicular to that of the first galvanometer 404, the motion of the single power source is transformed into the orthogonal and opposite swing of the two galvanometers. This retains the two-dimensional scanning capability of the original dual galvanometers and simplifies the control logic. The swing phase difference of the two galvanometers is set by the eccentric angle of crank 407, so that the light spot covers the optical windows on both sides of the sample flow cell 7 with a scanning trajectory of superimposed two-dimensional sine curves.

[0030] Please see Figure 7 A focusing switching assembly 6 is installed at the top of the gantry 401. The focusing switching assembly 6 includes a support 601 fixedly installed at the top of the gantry 401. A cam column 602 is rotatably installed at the rear end of the support 601. A driven wheel 603 is coaxially connected to the end of the cam column 602. The driven wheel 603 is rotated and transmitted to the drive wheel 406 at the rotating end of the motor 405 via a synchronous belt. The focusing switching assembly 6 also includes a ring pin 604 fixedly installed on the outer circle of the cam column 602. Two telescopic rods 605 are arranged parallel to each other along the axis at the upper and lower ends of the cam column 602. The pin at the rear end of the telescopic rod 605 is slidably installed on the outer edge of the ring pin 604. The middle part of the telescopic rod 605 is limited and matched with the corresponding through holes at both ends of the support 601. The focusing switching assembly 6 also includes field lenses 606 fixedly connected to the front ends of the telescopic rods 605 on both sides. There are two field lenses 606, which are respectively connected to the front ends of the corresponding telescopic rods 605. The two field lenses 606 have different spot focusing positions at different heights.

[0031] The specific operation is as follows: While the motor 405 drives the crank 407 at the tail of the output shaft to rotate, it also simultaneously drives the driven wheel 603 to rotate via the coaxial drive wheel 406 in the middle. Because the diameter of the drive wheel 406 is much smaller than that of the driven wheel 603, the output power of the motor 405 is transmitted to the cam column 602 through reduction and torque amplification. Then, under the rotational action of the cam column 602 and its outer ring pin 604, the sliding of the rear pin of the telescopic rod 605 on the outer edge of the ring pin 604 converts the rotational motion of the cam column 602 into the alternating extension and retraction motion of the telescopic rods 605 at both ends. Finally, the motion is transmitted to one side of the sample flow cell 7. After the optical window is cleaned, the focusing position of the light spot is changed by switching the two field lenses 606 at different height positions, thereby cleaning the optical window on the other side of the sample flow cell 7. This application replaces traditional electrical control with mechanical positioning, and achieves focusing switching through two fixed height positions to complete the cleaning of the optical windows on both sides of the sample flow cell 7. The system structure is simplified by power sharing, and the cleaning efficiency is improved by timing coordination. Ultimately, the entire device maintains the advantage of seamless switching between detection and cleaning while further reducing costs and improving reliability, making it more suitable for the needs of industrial continuous detection scenarios.

[0032] Please see Figures 1 to 3A sample flow cell 7 is installed at the top inside the housing 1, and a semiconductor laser 8 is provided on one side of the sample flow cell 7. A first mirror group 9 is provided on the semiconductor laser 8 along the direction of the detection laser light path. A right-angle prism 10 is provided between the first mirror group 9 and the sample flow cell 7. In the detection mode, the light is incident from the vertical plane of the right-angle prism 10 and exits parallel to the inclined plane. In the cleaning mode, the light is incident from the inclined plane of the right-angle prism 10 and reflected at a 90-degree angle. A second mirror group 11 is provided on the other side of the sample flow cell 7. Both the second mirror group 11 and the first mirror group 9 are composed of collimating lenses and focusing lenses. A light signal receiving module 12 is provided on the second mirror group 11 along the direction of the detection laser light path. The light signal receiving module 12 is electrically connected to the processor 13 outside the housing 1.

[0033] The specific operation is as follows: In detection mode, the laser emitted by semiconductor laser 8 passes through the first mirror group 9 and exits parallel to the inclined plane of the right-angle prism 10, focusing on the middle of the sample flow cell 7. When the converged laser beam irradiates the surface of tiny particles in the liquid to be tested in the sample flow cell 7, a light scattering effect is generated. The scattered light is collected by the second mirror group 11 and converged onto the optical signal receiving module 12. The optical signal receiving module 12 then converts the optical signal into an electrical signal and transmits it to the processor 13 for processing to obtain the detection data of liquid particles. This detection data includes the number and size of particles. In cleaning mode, the pulsed laser emitted by pulsed laser 3 passes through galvanometer 505 and galvanometer 404. After changing the illumination path, the light is irradiated onto the scene. Then, the light enters from the inclined surface of the right-angle prism 10 and is reflected at a 90-degree angle onto the surface of the optical window of the sample flow cell 7 to form a light spot. The focusing position of the light spot is changed by switching the field lens 606, thereby cleaning the surface of the two optical windows of the sample flow cell 7. This application achieves scanning of the pulsed laser spot in a two-dimensional plane by changing the deflection angle of the galvanometer, and then changes the focusing position of the light spot by switching the working position of the field lens 606. The cleaning mode can be seamlessly switched between detection modes. The thermal stress generated by laser irradiation is used to achieve rapid and non-destructive cleaning of the surface of the optical window of the sample flow cell 7, which not only has a good cleaning effect, but also a fast cleaning speed.

[0034] In summary, when using this liquid optical particle size analyzer for new chemical materials with adjustable optical path components:

[0035] First, the motor 405 is activated, driving the crank 407, which is coaxial with the output shaft, to rotate. The sliding of the pin on the crank 407 away from the rotation center within the slot of the slotted rocker arm 403 converts the rotational motion of the motor 405's output shaft into the reciprocating oscillation of the slotted rocker arm 403. This not only drives the galvanometer 404, coaxial with the slotted rocker arm 403, to reciprocate, but also drives the sector gear 503, coaxial with the slotted rocker arm 403, to reciprocate. Furthermore, the meshing action between the sector gear 503 and the end of the double-ended rack 502 drives the double-ended rack 502... 02 The bevel gear end rotates, and finally, under the meshing transmission of the bevel gear end of the double-headed rack 502 and the bevel gear 504, the second galvanometer 505 is driven to swing back and forth. While ensuring that the rotation axis of the second galvanometer 505 and the first galvanometer 404 are perpendicular, the motion of the single power source is transformed into the orthogonal and opposite swing of the two galvanometers. This not only retains the two-dimensional scanning capability of the original dual galvanometers, but also simplifies the control logic. The swing phase difference of the two galvanometers is set by the eccentric angle of the crank 407, so that the light spot covers the optical windows on both sides of the sample flow cell 7 with a scanning trajectory of superimposed two-dimensional sine curves.

[0036] Secondly, while the motor 405 drives the crank 407 at the tail of the output shaft to rotate, it also simultaneously drives the driven wheel 603 to rotate via the coaxial drive wheel 406 in the middle. Since the diameter of the drive wheel 406 is much smaller than that of the driven wheel 603, the output power of the motor 405 is transmitted to the cam column 602 through reduction and torque amplification. Then, under the rotational action of the cam column 602 and its outer ring pin 604, the sliding of the rear pin of the telescopic rod 605 on the outer edge of the ring pin 604 converts the rotational motion of the cam column 602 into the alternating extension and retraction motion of the telescopic rods 605 at both ends. Finally, the optical motion is generated on one side of the sample flow cell 7. After the window cleaning is completed, the focusing position of the light spot is changed by switching the two field lenses 606 at different height positions, thereby cleaning the optical window on the other side of the sample flow cell 7. This application replaces the traditional electrical control with mechanical positioning, and achieves focusing switching through two fixed height positions to complete the cleaning of the optical windows on both sides of the sample flow cell 7. The system structure is simplified by power sharing, and the cleaning efficiency is improved by timing coordination. Ultimately, the entire device maintains the advantage of seamless switching between detection and cleaning while further reducing costs and improving reliability, making it more suitable for the needs of industrial continuous detection scenarios.

[0037] Finally, in detection mode, the laser emitted by semiconductor laser 8 passes through the first mirror group 9 and exits parallel to the inclined plane of the right-angle prism 10, focusing on the middle of the sample flow cell 7. When the converged laser beam irradiates the surface of tiny particles in the liquid to be tested in the sample flow cell 7, a light scattering effect is generated. The scattered light is collected by the second mirror group 11 and converged onto the optical signal receiving module 12. The optical signal receiving module 12 then converts the optical signal into an electrical signal and transmits it to the processor 13 for processing to obtain detection data of liquid particles. This detection data includes the number and size of particles. In cleaning mode, the pulsed laser emitted by pulsed laser 3 is modified by galvanometer 2 505 and galvanometer 1 404. After the light path is illuminated onto the scene, the light is incident from the inclined surface of the right-angle prism 10 and reflected at a 90-degree angle onto the surface of the optical window of the sample flow cell 7 to form a light spot. The focusing position of the light spot is changed by switching the field lens 606, thereby cleaning the surface of the two optical windows of the sample flow cell 7. This application achieves scanning of the pulsed laser spot in a two-dimensional plane by changing the deflection angle of the galvanometer, and then changes the focusing position of the light spot by switching the working position of the field lens 606. The cleaning mode can be seamlessly switched between detection modes. The thermal stress generated by laser irradiation is used to achieve rapid and non-destructive cleaning of the surface of the optical window of the sample flow cell 7, which not only has a good cleaning effect, but also a fast cleaning speed.

[0038] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly, comprising a housing (1) and an optical path adjustment assembly (4), characterized in that, The base (2) is fixedly installed at the bottom of the housing (1), and a pulsed laser (3) is fixedly installed on one side of the base (2). The optical path adjustment assembly (4) is located on the other side of the base (2). The optical path adjustment assembly (4) includes a gantry (401) fixedly installed on the side of the base (2). A bearing seat (402) is fixedly installed at the top of the gantry (401), and a slotted swing arm (403) is rotatably installed in the middle of the bearing seat (402) through a shaft. A galvanometer (404) is coaxially installed on the slotted swing arm (403) through a shaft. The gantry (401) A motor (405) is fixedly installed on the side end, and a drive wheel (406) is coaxially installed in the middle of the rotating end of the motor (405). A crank (407) is coaxially installed at the tail of the rotating end of the motor (405), and the pin of the crank (407) away from the rotation center slides in the groove of the slotted rocker arm (403). A follow-up adjustment component (5) is provided in the middle of the base (2). The follow-up adjustment component (5) includes a shaft frame (501) fixedly installed in the middle of the base (2). A double-headed rack (502) is rotatably installed in the middle of the shaft frame (501). The following adjustment assembly (5) is composed of a parachute wheel on one side and a gear on the other side coaxially. It also includes a sector gear (503) positioned above one side of the gear end of the double-ended rack (502). The sector gear (503) rotates towards the parachute wheel end on the other side through meshing with the gear end of the double-ended rack (502). The rotation center of the sector gear (503) is coaxially connected to the slotted swing arm (403) and the galvanometer (404) via shafts. The following adjustment assembly (5) also includes a bevel gear (504) meshing and mounted below one side of the parachute wheel end of the double-ended rack (502). 04) A second galvanometer (505) is coaxially mounted in the middle, and the rotation axis of the second galvanometer (505) is perpendicular to that of the first galvanometer (404). A focusing switching assembly (6) is mounted on the top of the gantry (401). The focusing switching assembly (6) includes a support (601) fixedly mounted on the top of the gantry (401). A cam column (602) is rotatably mounted on the rear end of the support (601), and a driven wheel (603) is coaxially connected to the end of the cam column (602). The driven wheel (603) is rotated and driven by the drive wheel (406) at the rotating end of the motor (405) through a synchronous belt.

2. The liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly according to claim 1, characterized in that, The focus switching assembly (6) also includes a ring pin (604) fixedly installed on the outer circle of the cam column (602). Two telescopic rods (605) are arranged parallel to each other along the axis at the upper and lower ends of the cam column (602). The rear pin of the telescopic rod (605) is slidably installed on the outer edge of the ring pin (604). The middle part of the telescopic rod (605) is matched with the corresponding through holes at both ends of the support (601).

3. A liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly according to claim 2, characterized in that, The focusing switching component (6) also includes a field lens (606) fixedly connected to the front end of the telescopic rods (605) on both sides. There are two field lenses (606) respectively connected to the front end of the corresponding telescopic rods (605), and the two field lenses (606) have different spot focusing positions at different heights.

4. A liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly according to claim 3, characterized in that, The sample flow cell (7) is installed at the top inside the housing (1), and a semiconductor laser (8) is provided on one side of the sample flow cell (7), and a first mirror group (9) is provided on the semiconductor laser (8) along the direction of the detection laser light path.

5. A liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly according to claim 4, characterized in that, A right-angle prism (10) is provided between the first mirror group (9) and the sample flow cell (7). In the detection mode, the light is incident from the vertical plane of the right-angle prism (10) and exits parallel to the inclined plane. In the cleaning mode, the light is incident from the inclined plane of the right-angle prism (10) and reflected at ninety degrees.

6. A liquid optical particle size analyzer for new chemical materials with an adjustable optical path assembly according to claim 5, characterized in that, A second mirror group (11) is provided on the other side of the sample flow cell (7), and both the second mirror group (11) and the first mirror group (9) are composed of collimating lenses and focusing lenses. The second mirror group (11) is provided with a light signal receiving module (12) along the direction of the detection laser light path, and the light signal receiving module (12) is electrically connected to the processor (13) outside the housing (1).

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