A focal length adjustment device for a digester light source

Abstract

The utility model discloses a kind of focal length adjusting device for light source of digester, it relates to water quality on-line equipment technical field, it includes light source base and first focusing element, by being set in first installation hole between light source element and installation frame body by being set first installation hole on light source base, first focusing assembly that can be moved along the first installation hole axial direction is set in first installation hole, and focusing element is installed in first installation hole;When using, the position of first focusing assembly in first installation hole is adjusted, to drive focusing element to approach or away from light source element, the distance of focusing element and light source element is adjusted, and then the focal point position of light beam emitted by light source element is changed ultimately, the distribution and intensity of light beam in optical path channel are changed, so that digester can be suitable for the measurement of different pollutant or the measurement of same pollutant different concentration.

Description

Technical Field

[0001] This utility model relates to the field of online water quality equipment technology, and in particular to a focus adjustment device for a digester light source. Background Technology

[0002] A single-parameter online water quality device is an automated instrument that monitors a specific indicator (such as COD, ammonia nitrogen, total phosphorus, total nitrogen, turbidity, etc.) in water in real time. This device includes a digester, which reacts pollutants (such as organic matter, ammonia, phosphorus, etc.) in the water sample with chemical reagents at high temperatures, converting the target components into a form measurable by colorimetry or other methods. Therefore, the digester typically includes a colorimetric system (optical detector). The optical detector detects the color change after the water sample reaction, thereby quantitatively analyzing the concentration of a specific pollutant. The optical detector usually includes a light source, an optical path channel, and a colorimetric cell. When the light source illuminates a substance passing through the optical path channel, its color changes, which are received and compared by the optical detector, thus identifying the concentration of the substance based on the color change.

[0003] Different types of water quality indicators (such as COD, ammonia nitrogen, and total phosphorus) or different concentrations of pollutants will exhibit varying optical properties (such as absorbance and color intensity) after digestion. These differences necessitate adjustments to the light distribution or intensity within the optical path channel to accommodate diverse measurement requirements. For instance, high-concentration samples may require stronger light focusing, while low-concentration samples may require a longer optical path to enhance the signal. However, the positions between the light source and the optical detector in existing digesters are typically fixed; that is, the focal point of the light source after passing through the lens is fixed, and the distribution and intensity of light passing through the optical path channel are also fixed. This makes it unsuitable for measuring different pollutants or pollutant concentrations. Utility Model Content

[0004] The main purpose of this invention is to propose a focal length adjustment device for a digester light source, which aims to solve the technical problem that the focal length of existing digester light sources cannot be adjusted.

[0005] To achieve the above objectives, this utility model proposes a focal length adjustment device for a digester light source, comprising: a light source base, which is mounted on a mounting frame, and the light source base has a through first mounting hole, the two ends of which are respectively used to connect a light source element and the mounting frame, so that the light beam of the light source element passes through the first mounting hole and enters the inner cavity of the mounting frame; and a first focusing element, which is mounted in the first mounting hole and has a focusing element installed inside, and the first focusing element can move axially along the first mounting hole, thereby driving the focusing element to move closer to or away from the light source element.

[0006] Optionally, the first mounting hole includes a first threaded section, and the first focusing element is tubular; a first threaded portion is provided on the outer peripheral wall of the first focusing element, and the first threaded portion is threadedly connected to the first threaded section.

[0007] Optionally, a second focusing element is also included. One end face of the second focusing element is provided with a snap-fit ​​protrusion, and the other end is located in the inner cavity of the mounting frame. The end of the first focusing element away from the light source element is provided with an adjustment slot, and the snap-fit ​​protrusion is snapped into the adjustment slot, thereby causing the second focusing element to drive the first focusing element to rotate.

[0008] Optionally, the second focusing element is provided with a second mounting hole, which is located in the inner cavity of the mounting frame, and the axis of the second mounting hole is perpendicular to the axis of the first mounting hole. The second mounting hole is used to install the operating element, thereby facilitating the rotation of the second focusing element.

[0009] Optionally, the first mounting hole also includes a limiting section connected to the first threaded section. The limiting section is coaxially arranged with the first threaded section and is located on the side away from the light source element. The diameter of the limiting section is larger than the diameter of the first threaded section. The first focusing element also includes a limiting part connected to the first threaded part. The outer diameter of the limiting part is larger than the outer diameter of the first threaded part. The end wall of the limiting part connected to the first threaded part abuts against the bottom wall of the limiting section, thereby preventing the first focusing element from getting closer to the light source element.

[0010] Optionally, a third mounting hole is provided on the peripheral wall of the light source base. The third mounting hole is connected to the limiting section, and a set screw for pressing against the limiting section is installed in the third mounting hole.

[0011] Optionally, the inner cavity of the first focusing element includes a lens receiving section and a lens limiting section connected together, and both the lens receiving section and the lens limiting section are coaxially arranged with the first mounting hole; a focusing element is installed in the lens receiving section, the lens receiving section is a tapered hole, the small diameter section of the tapered hole is close to the light source element, and the large diameter section of the tapered hole is connected to the lens limiting section; a lens plug is installed in the lens limiting section, and the lens plug is used to press the focusing element against the peripheral wall of the lens receiving section.

[0012] Optionally, the lens plug includes a plug body, which is tubular. A second threaded portion is provided on the outer peripheral wall of the plug body, and a second threaded segment is provided on the lens limiting section. The second threaded portion and the second threaded segment are threadedly connected. A first light-transmitting hole for the light beam to pass through is provided at the center of the lens plug. The first light-transmitting hole is coaxially arranged with the first mounting hole.

[0013] Optionally, the mounting frame is a square frame with a through fluid channel along the front-to-back direction; a first positioning hole and a second positioning hole are coaxially formed on a set of opposite side walls of the mounting frame, the light source base is mounted on the side wall where the second positioning hole is located, and the first positioning hole is coaxially set with the first mounting hole, and a light detection component is mounted on the side wall where the second positioning hole is located.

[0014] Optionally, the optical inspection assembly includes an optical inspection base, which has a fourth mounting hole coaxial with the second positioning hole. The fourth mounting hole is T-shaped and penetrates both the end wall and the side wall of the optical inspection base. A first optical inspection element and a second optical inspection element are respectively disposed at the two exit ends of the fourth mounting hole. A beam splitter is disposed inside the fourth mounting hole and is located at the intersection of the fourth mounting holes. The beam splitter is used to disperse the light beam emitted by the light source element to the first optical inspection element and the second optical inspection element.

[0015] This utility model discloses a focal length adjustment device for a digester light source. A first mounting hole is formed on the light source base, positioned between the light source element and the mounting frame. A first focusing component, movable axially along the first mounting hole, is installed within this hole, and a focusing element is mounted within it. In use, adjusting the position of the first focusing component within the first mounting hole moves the focusing element closer to or further away from the light source element, thereby adjusting the distance between them and changing the final focal point of the light beam emitted by the light source element. This alters the distribution and intensity of the light beam within the optical path, enabling the digester to be suitable for measuring different pollutants or different concentrations of the same pollutant. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a front view schematic diagram of the focus adjustment device for the digester light source of this utility model;

[0018] Figure 2 This is a side view schematic diagram of the focus adjustment device for the digester light source of this utility model;

[0019] Figure 3 for Figure 2 Schematic diagram of the cross section of AA;

[0020] Figure 4 for Figure 3 A schematic diagram of a structure equipped with a second focusing element;

[0021] Figure 5 This is a schematic diagram of the disassembly and installation path of the second focusing element;

[0022] Figure 6 This is a schematic diagram of the mounting structure of the light source base;

[0023] Figure 7 An exploded view of the focus adjustment device;

[0024] Figure 8 This is a schematic diagram of the structure of the light source base;

[0025] Figure 9 This is a schematic diagram showing the installation positions of the first focusing element, the focusing element, and the second focusing element.

[0026] Figure 10 This is a schematic diagram of the structure of the first focusing element;

[0027] Figure 11 This is a schematic diagram of the lens plug structure;

[0028] Figure 12 This is a schematic diagram of the second focusing element.

[0029] Explanation of icon numbers:

[0030] 1. Mounting frame; 11. Fluid channel; 12. First positioning hole; 13. Second positioning hole; 14. Frame mounting hole; 2. Light source element; 3. Light source base; 31. First mounting hole; 311. First threaded section; 312. Limiting section; 32. Third mounting hole; 4. First focusing element; 41. First threaded part; 42. Limiting part; 43. Adjusting slot; 44. Lens receiving section; 45. Lens limiting section; 451. Second threaded section; 5. Focusing element; 6. Lens plug; 61. Plug body; 62. Second threaded part; 63. First light-transmitting hole; 64. Protrusion; 7. Second focusing element; 71. Snap-fit ​​protrusion; 72. Second light-transmitting hole; 73. Second mounting hole; 8. Optical inspection assembly; 81. Optical inspection base; 82. Beam splitter; 83. First optical inspection element; 84. Second optical inspection element.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] 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.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, provided that they are feasible for those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] This invention proposes a focal length adjustment device for a digester light source.

[0036] In the embodiments of this utility model, such as Figures 1-7 As shown, a focal length adjustment device for a digester light source includes: a light source base 3, which is mounted on a mounting frame 1, and a light source element 2 is mounted on the light source base 3. A through first mounting hole 31 is provided on the inner side of the light source base 3, and the light source element 2 and the mounting frame 1 are located at opposite ends of the first mounting hole 31 along the axial direction; a first focusing element 4, which is mounted in the first mounting hole 31, and a focusing element 5 is mounted in the first focusing element 4. The first focusing element 4 can move along the axial direction of the first mounting hole 31, thereby causing the focusing element 5 to move closer to or further away from the light source element 2.

[0037] Specifically, a first mounting hole 31 is opened on the light source base 3, which is located between the light source element 2 and the mounting frame 1. A first focusing assembly that can move axially along the first mounting hole 31 is provided in the first mounting hole 31, and the focusing element 5 is installed in the first mounting hole 31. In use, by adjusting the position of the first focusing assembly in the first mounting hole 31, the focusing element 5 is moved closer to or further away from the light source element 2, thereby adjusting the distance between the focusing element 5 and the light source element 2, and thus changing the final focal point of the beam emitted by the light source element 2. This achieves the change of the distribution and intensity of the beam in the optical path channel, so that the digester can be used to measure different pollutants or different concentrations of the same pollutant.

[0038] Optionally, the first mounting hole 31 includes a first threaded section 311, and the first focusing element 4 is tubular; a first threaded portion 41 is provided on the outer peripheral wall of the first focusing element 4, and the first threaded portion 41 is threadedly connected to the first threaded section 311.

[0039] Specifically, by setting the first focusing element 4 as a tubular structure, an external thread can be provided on the outer peripheral wall of the first focusing element 4, thereby setting the connection between the first focusing element 4 and the first mounting hole 31 as a threaded connection. In use, the position of the focusing element 5 within the first mounting hole 31 can be precisely adjusted by rotating the first focusing element 4, thereby more precisely controlling the distance between the focusing element 5 and the light source element 2, and thus accurately adjusting the focal point of the beam. This effectively improves the accuracy and stability of the focal length adjustment, allowing the digester to more flexibly adapt to the measurement needs of different pollutants or different concentrations.

[0040] Optionally, it also includes a second focusing element 7, one end face of which is provided with a snap-fit ​​protrusion 71, and the other end is located in the inner cavity of the mounting frame 1; the end of the first focusing element 4 away from the light source element 2 is provided with an adjustment slot 43, and the snap-fit ​​protrusion 71 is snapped into the adjustment slot 43, so that the second focusing element 7 drives the first focusing element 4 to rotate.

[0041] Specifically, the inner cavity of the mounting frame 1 refers to the fluid channel 11 for fluid passage. Before use, the operator can connect the snap-fit ​​protrusion 71 of the second focusing element 7 to the snap-fit ​​slot 43 through the fluid channel 11. Then, by rotating the part of the second focusing element 7 located in the fluid channel 11, the first focusing element 4 can be rotated, thereby adjusting the distance between the focusing element 5 and the light source element 2.

[0042] More specifically, the adjustment slot 43 is a groove circumferentially formed along the end wall of the first focusing element 4. The adjustment slot 43 is discontinuous on the end wall of the first focusing element 4, meaning it is not a complete annular groove surrounding the first mounting hole 31. This ensures that after the engaging protrusion 71 engages within the adjustment slot 43, the torque generated by the rotation of the second focusing element 7 can be transmitted to the first focusing element 4 through the cooperation of the engaging protrusion 71 and the adjustment slot 43, thus ensuring the synchronicity and stability of the rotation. Simultaneously, the engaging connection between the engaging protrusion 71 and the adjustment slot 43 allows for a detachable connection between the second focusing element 7 and the first focusing element 4. Therefore, when focusing is required, the operator removes the second focusing element 7 and aligns it with the first focusing element 4 via the fluid channel 11 (e.g., ...). Figure 4 and Figure 5 As shown), after engaging the locking protrusion 71 with the adjustment slot 43, rotate to adjust the focal length. After the focal length adjustment is completed, remove and take out the second focusing element 7.

[0043] Optional, such as Figures 1-12 As shown, the second focusing element 7 has a second mounting hole 73. The second mounting hole 73 is located in the inner cavity of the mounting frame 1, and the axis of the second mounting hole 73 is perpendicular to the axis of the first mounting hole 31. The second mounting hole 73 is used to install operating elements, thereby facilitating the rotation of the second focusing element 7.

[0044] Specifically, the second focusing element 7 is tubular and has a second light-transmitting hole 72 inside. The second light-transmitting hole 72 is coaxially arranged with the first mounting hole 31 so that the light beam generated by the light source element 2 can pass through the second light-transmitting hole 72, thereby allowing the operator to visually observe the change of focus within the fluid channel 11 when adjusting the focus. A second mounting hole 73 is formed on the peripheral wall of the second focusing element 7, and at least two second mounting holes 73 are formed on the peripheral wall of the second focusing element 7. By inserting a rod-shaped operating element into the second mounting hole 73, the operating element forms a pair of symmetrical force couple walls on both sides of the second focusing element 7, facilitating the rotation of the second focusing element 7.

[0045] Optionally, the first mounting hole 31 further includes a limiting section 312 connected to the first threaded section 311. The limiting section 312 is coaxially arranged with the first threaded section 311, and the limiting section 312 is located on the side away from the light source element 2. The diameter of the limiting section 312 is larger than the diameter of the first threaded section 311. The first focusing element 4 further includes a limiting part 42 connected to the first threaded part 41. The outer diameter of the limiting part 42 is larger than the outer diameter of the first threaded part 41. The end wall of the limiting part 42 connected to the first threaded part 41 abuts against the bottom wall of the limiting section 312, thereby preventing the first focusing element 4 from continuing to approach the light source element 2.

[0046] Specifically, the first threaded portion 41 of the first focusing element 4 is connected to the first threaded segment 311 of the first mounting hole 31, and the limiting portion 42 is located inside the limiting segment 312. The inner diameter of the limiting segment 312 is larger than the inner diameter of the first threaded segment 311, so that the part where the limiting segment 312 is connected to the first threaded segment 311 forms the end wall of the limiting segment 312.

[0047] More specifically, the bottom wall of the limiting section 312 is an annular plane. When the first focusing element 4 moves toward the light source element 2 in the first mounting hole 31, the limiting part 42 comes into contact with the end face (i.e., the bottom wall) of the limiting section 312 near the first threaded section 311, thereby forming a physical block, so that the first focusing element 4 can no longer move toward the light source element 2.

[0048] Optionally, a third mounting hole 32 is also provided on the peripheral wall of the light source base 3. The third mounting hole 32 communicates with the limiting section 312, and a set screw for pressing against the limiting part 42 is installed in the third mounting hole 32. Figure 3 (Not marked in the text).

[0049] Specifically, the third mounting hole 32 is perpendicular to the axial direction of the limiting section 312, that is, the third mounting hole 32 extends from the side wall of the light source base 3 into the inner cavity of the limiting section 312, so that the end of the set screw can enter the limiting section 312 through the third mounting hole 32 and contact the outer surface of the limiting part 42. In this embodiment, the set screw can abut against and act on the limiting part 42, further ensuring the fixation of the first focusing element 4 in the position of the first mounting hole 31 during use. When it is necessary to adjust the focus, the set screw is first loosened, and then the second focusing element 7 is connected for focus adjustment.

[0050] More specifically, the third mounting hole 32 is a threaded hole, the set screw has external threads, and the end of the set screw away from the limiting part 42 is provided with an internal hexagon countersunk hole to facilitate tightening or loosening the set screw with a hexagonal wrench. This embodiment enhances the locking capability of the first focusing element 4 during use by opening the third mounting hole 32 on the light source base 3 and installing the set screw in the third mounting hole 32. This prevents the first focusing element 4, after being adjusted to the appropriate position, from rotating or axially displacing due to vibration, external impact, or other unexpected factors during use. It effectively maintains the stability of the distance between the focusing element 5 and the light source element 2 during use, ensuring the accuracy of the beam focus point and avoiding repeated adjustments due to positional loosening.

[0051] Optional, such as Figures 1-10As shown, the inner cavity of the first focusing element 4 includes a lens receiving section 44 and a lens limiting section 45 connected together, and both the lens receiving section 44 and the lens limiting section 45 are coaxially arranged with the first mounting hole 31; a focusing element 5 is installed in the lens receiving section 44, the lens receiving section 44 is a tapered hole, the small diameter section of the tapered hole is close to the light source element 2, and the large diameter section of the tapered hole is connected to the lens limiting section 45; a lens plug 6 is installed in the lens limiting section 45, and the lens plug 6 is used to press the focusing element 5 against the peripheral wall of the lens receiving section 44.

[0052] Specifically, the lens receiving section 44 and the lens limiting section 45 are two continuous regions within the cavity of the first focusing element 4, and both are coaxially arranged with the first mounting hole 31 to ensure that the light beam passes along the axial direction. The focusing element 5 is installed inside the lens receiving section 44. In this embodiment, the lens plug 6 can be screwed into the lens limiting section 45 or directly pressed in. The lens plug 6 contacts the focusing element 5 and applies pressure, pressing the focusing element 5 against the peripheral wall of the lens receiving section 44, thereby achieving a stable fixation of the focusing element 5.

[0053] More specifically, the lens receiving section 44 is a tapered aperture with a gradually changing diameter. The smaller diameter end is close to the light source element 2, while the larger diameter end is connected to the lens limiting section 45. The tapered aperture can simultaneously limit the focusing element 5 circumferentially and axially, ensuring that the focusing element 5 is firmly attached to the inner wall of the lens receiving section 44, thereby preventing the focusing element 5 from shifting during installation or use.

[0054] Preferably, the lens stopper 6 and the lens limiting section 45 are connected by threads.

[0055] Specifically, such as Figures 1-11 As shown, the lens plug 6 includes a plug body 61, which is tubular. A second threaded portion 62 is provided on the outer peripheral wall of the plug body 61. A second threaded section 451 is provided on the lens limiting section 45. The second threaded portion 62 and the second threaded section 451 are threadedly connected. A first light-transmitting hole 63 for the light beam to pass through is provided in the center of the lens plug 6. The first light-transmitting hole 63 is coaxially arranged with the first mounting hole 31.

[0056] More specifically, a protrusion 64 is provided on the end wall of the lens retainer 6 away from the focusing element 5. The protrusion 64 is radially arranged along the end face of the retainer body 61, and the retainer body 61 has at least two protrusions 64 evenly arranged on its end face. When installing the lens retainer 6, the operator holds the protrusion 64 and rotates the retainer body 61, so that the retainer body 61 moves closer to the focusing element 5 along the axial direction of the first mounting hole 31, and presses the focusing element 5 against the peripheral wall of the lens receiving section 44. The two protrusions 64 form a symmetrical force couple, making it easier for the operator to rotate the retainer body 61.

[0057] In this embodiment, by designing the lens plug 6 as a tubular structure with a second threaded portion 62, and the second threaded portion 62 being threadedly connected to the second threaded portion 451 of the lens limiting section 45, the lens plug 6 can be precisely adjusted in position by rotation, thereby more firmly pressing the focusing element 5 and avoiding loosening caused by external force or vibration.

[0058] Optional, such as Figures 1-5 As shown, the mounting frame 1 is a square frame, and the mounting frame 1 has a through fluid channel 11 along the front and back direction; a set of opposite side walls of the mounting frame 1 have a coaxial first positioning hole 12 and a second positioning hole 13, the light source base 3 is installed on the side wall where the second positioning hole 13 is located, and the first positioning hole 12 is coaxially arranged with the first mounting hole 31, and the optical detection component is installed on the side wall where the second positioning hole 13 is located.

[0059] Specifically, the mounting frame 1 has a through-flow fluid channel 11 along its front-to-back direction, allowing fluid to circulate within the mounting frame 1. Simultaneously, the side walls of the mounting frame 1 have coaxial first positioning holes 12 and second positioning holes 13, enabling the light beam from the light source element 2 to be precisely projected onto the optical detection element after being focused by the focusing element 5. Furthermore, the first positioning hole 12 and the second positioning hole 13 are located on the two side walls respectively, allowing the light to pass laterally through the fluid channel 11, illuminating the material within the fluid channel 11 before being projected onto the optical detection element. The light source base 3 can be securely connected to the side walls via bolts, snap-fit ​​connections, or welding. Similarly, the optical detection assembly can also be fixed with bolts or snap-fits to ensure its stable position and alignment with the light source base 3, thereby receiving the light beam after passing through the fluid channel 11.

[0060] In this embodiment, the mounting frame 1 is further provided with a frame mounting hole 14, which is a through hole penetrating the bottom and top walls of the mounting frame 1. The frame mounting hole 14 is used to fix the mounting frame 1 in the usage environment. Specifically, the mounting frame 1 can be installed and fixed by fastening components such as bolt assemblies.

[0061] The above embodiments further define the specific structure of the mounting frame 1 and the installation position of the optical detection component, significantly improving the integration and measurement adaptability of the digester. Compared to the focal length adjustment scheme that only describes the first focusing element 4 and the focusing element 5, this embodiment designs the mounting frame 1 as a square frame with a fluid channel 11 opened in the vertical direction, allowing fluid to flow freely within the device. Simultaneously, the first positioning hole 12 and the second positioning hole 13, arranged coaxially, ensure that the light beam can accurately pass through the fluid channel 11 and be detected by the optical detection component. In this embodiment, this design not only facilitates the entry and exit of fluid and the stable transmission of the light beam, but also, through the reasonable layout of the light source base 3 and the optical detection component, enables the device to simultaneously perform fluid processing and optical detection functions. Compared to schemes that do not define the shape of the mounting frame 1 and the position of the optical detection component, this embodiment improves the compactness of the device and the measurement accuracy for different pollutants or concentrations, significantly improving the multifunctionality and practicality of the digester.

[0062] Optionally, the optical inspection assembly includes an optical inspection base, which has a fourth mounting hole (not shown in the figure) coaxial with the second positioning hole 13. The fourth mounting hole is T-shaped and penetrates both the end wall and the side wall of the optical inspection base. The two exit ends of the fourth mounting hole are respectively provided with a first optical inspection element 83 and a second optical inspection element 84. A beam splitter is provided in the fourth mounting hole, which is located at the intersection of the fourth mounting holes. The beam splitter is used to disperse the light beam emitted by the light source element 2 to the first optical inspection element 83 and the second optical inspection element 84.

[0063] Specifically, the beam splitter is used to separate the light after passing through the fluid channel 11, so that the light beam of a specific frequency is reflected to the first photodetector 83, and the remaining light beam passes through the beam splitter and is projected onto the second photodetector 84, thereby enabling the simultaneous detection of the concentrations of two different substances in the fluid channel 11.

[0064] In this embodiment, the first optical sensing element 83 and the second optical sensing element 84 are used to receive light of a specific frequency after passing through the fluid channel 11, and are typically photoelectric sensors. The first optical sensing element 83 and the second optical sensing element 84 are commercially available products and are not indispensable technical features for solving the technical problem of this utility model, and will not be described in detail here.

[0065] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A focal length adjustment device for a digester light source, characterized by, include: The light source base (3) has a through first mounting hole (31). The two ends of the first mounting hole (31) are used to connect the light source element (2) and the mounting frame (1) respectively, so that the light beam of the light source element (2) passes through the first mounting hole (31) and enters the inner cavity of the mounting frame (1). The first focusing element (4) is installed in the first mounting hole (31). The first focusing element (4) is equipped with a focusing element (5). The first focusing element (4) can move along the axial direction of the first mounting hole (31), thereby driving the focusing element (5) to move closer to or further away from the light source element (2).

2. The focus adjustment device for a digester light source as described in claim 1, characterized in that, The first mounting hole (31) includes a first threaded section (311), and the first focusing element (4) is tubular; The first focusing element (4) has a first threaded part (41) on its outer peripheral wall, and the first threaded part (41) is threadedly connected to the first threaded segment (311).

3. The focus adjustment device for a digester light source as described in claim 2, characterized in that, It also includes a second focusing element (7), one end face of which is provided with a snap-fit ​​protrusion (71), and the other end is located in the inner cavity of the mounting frame (1); The first focusing element (4) has an adjustment slot (43) at one end away from the light source element (2), and the locking protrusion (71) is locked in the adjustment slot (43), so that the second focusing element (7) drives the first focusing element (4) to rotate.

4. The focal length adjustment device for a digester light source of claim 3, wherein, The second focusing element (7) has a second mounting hole (73) located in the inner cavity of the mounting frame (1), and the axis of the second mounting hole (73) is perpendicular to the axis of the first mounting hole (31). The second mounting hole (73) is used to install the operating element, thereby facilitating the rotation of the second focusing element (7).

5. The focus adjustment device for a digester light source as described in claim 2, characterized in that, The first mounting hole (31) further includes a limiting section (312) connected to the first threaded section (311). The limiting section (312) is coaxially arranged with the first threaded section (311), and the limiting section (312) is located on the side away from the light source element (2). The diameter of the limiting section (312) is larger than the diameter of the first threaded section (311). The first focusing element (4) also includes a limiting part (42) connected to the first threaded part (41). The outer diameter of the limiting part (42) is larger than the outer diameter of the first threaded part (41). The end wall of the limiting part (42) connected to the first threaded part (41) abuts against the bottom wall of the limiting section (312), thereby preventing the first focusing element (4) from continuing to approach the light source element (2).

6. The focus adjustment device for a digester light source as described in claim 5, characterized in that, The peripheral wall of the light source base (3) is also provided with a third mounting hole (32), which is connected to the limiting section (312). A set screw for pressing against the limiting part (42) is installed in the third mounting hole (32).

7. The focus adjustment device for a digester light source as described in claim 2, characterized in that, The inner cavity of the first focusing element (4) includes a lens receiving section (44) and a lens limiting section (45) connected together, and the lens receiving section (44) and the lens limiting section (45) are both coaxially arranged with the first mounting hole (31); A focusing element (5) is installed in the lens receiving section (44). The lens receiving section (44) is a tapered hole. The small diameter section of the tapered hole is close to the light source element (2), and the large diameter section of the tapered hole is connected to the lens limiting section (45). A lens stopper (6) is installed in the lens limiting section (45), and the lens stopper (6) is used to press the focusing element (5) against the peripheral wall of the lens receiving section (44).

8. The focus adjustment device for a digester light source as described in claim 7, characterized in that, The lens plug (6) includes a plug body (61), which is tubular. A second threaded portion (62) is provided on the outer peripheral wall of the plug body (61), and a second threaded section (451) is provided on the lens limiting section (45). The second threaded portion (62) and the second threaded section (451) are threadedly connected. The lens plug (6) has a first light-transmitting hole (63) at its center for the light beam to pass through, and the first light-transmitting hole (63) is coaxially arranged with the first mounting hole (31).

9. The focus adjustment device for a digester light source as described in claim 2, characterized in that, The mounting frame (1) is a square frame, and the mounting frame (1) has a through fluid channel (11) in the front and back direction. The mounting frame (1) has a set of opposite side walls with a coaxial first positioning hole (12) and a second positioning hole (13). The light source base (3) is installed on the side wall where the second positioning hole (13) is located. The first positioning hole (12) is coaxially arranged with the first mounting hole (31). The light detection component (8) is installed on the side wall where the second positioning hole (13) is located.

10. The focal length adjustment device for a digester light source of claim 9, wherein, The optical inspection assembly (8) includes an optical inspection base (81), which has a fourth mounting hole coaxial with the second positioning hole (13). The fourth mounting hole is T-shaped and penetrates both the end wall and the side wall of the optical inspection base (81). The two outlet ends of the fourth mounting hole are respectively provided with a first optical detection element (83) and a second optical detection element (84). A beam splitter (82) is provided in the fourth mounting hole. The beam splitter (82) is located at the intersection of the fourth mounting hole. The beam splitter (82) is used to disperse the light beam emitted by the light source element (2) to the first photodetector element (83) and the second photodetector element (84).

Images