Liquid near-infrared detection device

Abstract

The utility model relates to the field of near-infrared detection equipment, in particular to a liquid near-infrared detection device which comprises a detection positioning seat, a cuvette, a near-infrared probe and an electric driving device arranged on the detection positioning seat, a bushing is arranged on the outer side of the cuvette, the electric driving device is connected with the bushing, and the near-infrared probe is arranged on the detection positioning seat. The cuvette is driven by the electric driving device to rotate at a constant speed; the near-infrared probe is arranged on the detection positioning seat and is used for carrying out near-infrared detection on liquid in the cuvette; according to the liquid near-infrared detection device disclosed by the utility model, the pressing block is arranged in the cuvette, so that the optical path of the near-infrared light is consistent when the same liquid is measured for multiple times, and uniform and good diffuse reflection can also be formed through the bottom surface of the pressing block; and more near-infrared light is reflected back to the near-infrared probe, so that the near-infrared probe can receive a signal with higher intensity, and the cuvette rotates at a constant speed, so that the detection result of the liquid is more accurate.

Description

Technical Field

[0001] The utility model relates to the field of near-infrared detection equipment, and more specifically, to a liquid near-infrared detection device. Background Art

[0002] Currently, when people check the components of a liquid, they pour the liquid to be detected into a cuvette of a near-infrared detection device, perform a transmission scan on the liquid in the cuvette with near-infrared light, and rely on the liquid itself to reflect part of the near-infrared light back to the near-infrared probe for reception, so as to detect and analyze the components of the liquid to be detected.

[0003] However, in the prior art, a transmission method is used for scanning, and only the liquid itself is relied on to reflect part of the near-infrared light back to the near-infrared probe for reception. In this way, the near-infrared light reflected back to the near-infrared probe is less and the signal intensity is low. In addition, since the cuvette does not rotate at a constant speed, the distribution position of the liquid components in the cuvette is not uniform. Therefore, large errors are likely to occur during component analysis. Finally, when people put the liquid to be detected into the cuvette, there are likely to be problems of too much or too little liquid, which will also cause the detection optical path of the near-infrared light to be inconsistent each time when the same liquid is detected multiple times. Therefore, there are variable factors, which will also have a great impact on the measurement results.

[0004] Therefore, it is necessary to propose a liquid near-infrared detection device to solve the above problems. Summary of the Utility Model

[0005] The utility model provides a liquid near-infrared detection device to overcome at least one of the above-mentioned defects (deficiencies) in the prior art.

[0006] To solve the above technical problems, the technical solution of the utility model is as follows: A liquid near-infrared detection device includes a detection positioning seat, a cuvette, a near-infrared probe, and an electric driving device arranged on the detection positioning seat;

[0007] A bushing is arranged on the outer side of the cuvette, and the electric driving device is connected to the bushing, so that the cuvette rotates at a constant speed under the drive of the electric driving device;

[0008] The near-infrared probe is arranged on the detection positioning seat for performing near-infrared detection on the liquid in the cuvette;

[0009] A pressing block for diffusely reflecting near-infrared light is provided inside the cuvette. By setting the pressing block inside the cuvette, it can ensure that the gap between the bottom surface of the cuvette and the bottom surface of the pressing block remains consistent. Thus, when the solution is measured multiple times, the problem of inconsistent optical path of near-infrared light caused by too much or too little added liquid does not occur. Also, a uniform and good diffuse reflection can be formed through the bottom surface of the pressing block, allowing more near-infrared light to be reflected back to the near-infrared probe, so that the near-infrared probe can receive a stronger signal. In addition, by driving the cuvette to rotate at a constant speed through an electric driving device, the components in the liquid to be detected can be evenly distributed inside the cuvette, and after multiple rotations and removing the mean value, the detection result of the liquid is more accurate.

[0010] Further, the pressing block is detachably arranged on the cuvette, and the lower surface of the pressing block is a uniform and smooth diffuse reflection surface.

[0011] Furthermore, a holding handle is provided at the top of the pressing block, and a plurality of support feet with the same height are provided at the bottom of the pressing block. The pressing block, the holding handle and the support feet are of an integral structure. By setting the holding handle, it is convenient to take and place the pressing block. Since the heights of the plurality of support feet are the same, the bottom surface of the pressing block is parallel to the bottom surface of the cuvette. Therefore, the gap between the bottom surface of the cuvette and the bottom surface of the pressing block is fixed, making the optical path of near-infrared light consistent and facilitating the diffuse reflection of near-infrared light. In addition, the setting of the support feet can make the liquid to be detected fill the gap between the bottom surface of the cuvette and the bottom surface of the pressing block when the pressing block is put in, facilitating the detection of near-infrared light. In practical applications, the height of the support feet can be set according to needs to adjust the height of the liquid to be detected, and all are within the protection scope of the present utility model.

[0012] Further, the electric driving device includes a motor, a rotating shaft, a limit mounting seat, a rotation limiter, a driving wheel connecting shaft, a driving wheel, a supporting wheel mounting shaft and a supporting wheel;

[0013] The limit mounting seat is arranged on the detection positioning seat, the motor is rotatably arranged on the limit mounting seat through the rotating shaft, and the rotation limiter is arranged on the limit mounting seat to limit the rotation angle of the motor;

[0014] The driving wheel connecting shaft is connected to the motor, and the driving wheel is arranged on the driving wheel connecting shaft;

[0015] The supporting wheel mounting shaft is arranged on the detection and positioning seat, the supporting wheel is arranged on the supporting wheel mounting shaft, and the mounting heights between the supporting wheel and the driving wheel are flush. Since the motor is arranged on the limit mounting seat through the rotating shaft, the motor can rotate within a limited angular range. Due to the setting of the rotation limiter, the rotation angle of the motor can be limited and reset. In practical applications, when a cuvette needs to be placed, the motor can be rotated by a certain angle to facilitate the placement of the cuvette. After the cuvette is placed, only by loosening the motor, under the action of the rotation limiter, the driving wheel on the motor presses on the bushing of the cuvette, and the cuvette is supported and pressed by the driving wheel and the supporting wheel. When it is necessary to drive the cuvette to rotate uniformly, the motor drives the driving wheel to rotate uniformly, and under the action of friction, the cuvette starts to rotate uniformly.

[0016] Furthermore, an inner groove is provided on the bushing, and both the driving wheel and the supporting wheel are clamped in the inner groove of the bushing. Through the setting of the inner groove, the driving wheel and the supporting wheel can be better pressed in the bushing.

[0017] Further, the rotation limiter includes a spring piece and a spring piece fixing screw;

[0018] One end of the spring piece is installed on the limit mounting seat through the spring piece fixing screw, and the other side of the spring piece is attached to the motor, so that the driving wheel presses on the bushing. By utilizing the elasticity of the spring piece itself, the driving wheel on the motor can press on the bushing. When it is necessary to take out the cuvette, only by overcoming the elastic force of the spring piece to rotate the motor by a certain angle, the cuvette can be taken out, which is simple and convenient.

[0019] Furthermore, at least one set of the supporting wheel mounting shaft and the supporting wheel is provided. In practical applications, according to the weight and size of the cuvette, the installation position and the number of the supporting wheel mounting shaft and the supporting wheel can be set, so that the force on the bottom of the cuvette is more uniform, thereby facilitating the uniform rotation of the cuvette driven by the motor.

[0020] Further, the detection and positioning seat includes a detection table, a positioning base, positioning screws and a limit base;

[0021] The positioning base is arranged on the detection table;

[0022] A positioning hole is provided on the detection table, and a mounting through hole is provided on the limit base. After the positioning screw passes through the mounting through hole on the limit base, it is fixed in the positioning hole on the detection table. Through the setting of the positioning base, it is convenient to set and install the electric driving device and the cuvette. And since the limit base is detachably arranged on the detection table through the positioning screw, it can protect the detection table and make the detection table more beautiful at the same time.

[0023] Furthermore, the cuvette is made of quartz material, and the bushing is made of rubber material. The cuvette made of quartz material facilitates the scanning of the liquid in the cuvette by near-infrared light after transmission. The bushing made of rubber material can not only prevent the cuvette from directly contacting the driving wheel and the supporting wheel, reducing the impact of hard friction on the cuvette, but also enhance the frictional force between the driving wheel and the supporting wheel and the cuvette, enabling the cuvette to rotate uniformly driven by the motor.

[0024] Further, the pressing block, the holding handle and the supporting feet are all made of metal material, aluminum alloy or stainless steel material. The pressing block made of metal material, aluminum alloy or stainless steel material has a flat and smooth lower surface, so it can better diffuse-reflect near-infrared light, allowing more near-infrared light to be reflected back to the near-infrared probe, effectively improving the signal intensity received by the near-infrared probe, and thus making the detection of the liquid composition by the liquid near-infrared detection device more accurate. The integrated pressing block, holding handle and supporting feet can effectively simplify the overall structure of the pressing block, which is simple and practical.

[0025] Compared with the prior art, the beneficial effects of the technical solution of the present utility model are:

[0026] The liquid near-infrared detection device disclosed by the present utility model, by arranging a pressing block in the cuvette, can not only ensure that the gap between the bottom surface of the cuvette and the bottom surface of the pressing block remains consistent, so that when the solution is measured multiple times, the problem of inconsistent optical path of near-infrared light caused by too much or too little added liquid does not occur, but also can form uniform and good diffuse reflection through the bottom surface of the pressing block, allowing more near-infrared light to be reflected back to the near-infrared probe, enabling the near-infrared probe to receive a stronger signal. In addition, by driving the cuvette to rotate uniformly through the electric drive device, the components in the liquid to be detected can be evenly distributed in the cuvette, and after multiple rotations and removing the mean value, the detection result of the liquid is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural view of the cuvette placed in the liquid near-infrared detection device of the present utility model at the first angle.

[0028] Figure 2 is a schematic structural view of the cuvette placed in the liquid near-infrared detection device of the present utility model at the second angle.

[0029] Figure 3 is a schematic structural view of the cuvette placed in the liquid near-infrared detection device of the present utility model at the third angle.

[0030] Figure 4It is a schematic structural diagram of the fourth angle of the cuvette placed in the liquid near-infrared detection device in the present utility model.

[0031] Figure 5 It is a schematic structural diagram of the cuvette in the present utility model before being placed in the liquid near-infrared detection device.

[0032] Figure 6 It is a schematic structural diagram of the first angle of the electric drive device arranged on the liquid near-infrared detection device in the present utility model.

[0033] Figure 7 It is a schematic structural diagram of the second angle of the electric drive device arranged on the liquid near-infrared detection device in the present utility model.

[0034] Figure 8 It is a schematic structural diagram of the limit base and the limit mounting seat after being disassembled in the present utility model.

[0035] Figure 9 It is a schematic structural diagram of another angle of the limit base and the limit mounting seat after being disassembled in the present utility model.

[0036] Figure 10 It is a schematic structural diagram of the supporting wheel arranged on the detection positioning seat in the present utility model.

[0037] Figure 11 It is a schematic structural diagram of the pressing block arranged in the cuvette in the present utility model.

[0038] Figure 12 It is a schematic structural diagram of another angle of the pressing block arranged in the cuvette in the present utility model.

[0039] Figure 13 It is a schematic structural diagram of the bottom of the cuvette in the present utility model.

[0040] Figure 14 It is a schematic structural diagram of the pressing block in the present utility model.

[0041] Figure 15 It is a schematic structural diagram of another angle of the pressing block in the present utility model.

[0042] In the figure, 1 is the detection positioning seat, 2 is the cuvette, 3 is the near-infrared probe, 4 is the electric drive device, 5 is the bushing, 6 is the pressing block, 7 is the holding handle, 8 is the support foot, 9 is the motor, 10 is the rotating shaft, 11 is the limit mounting seat, 12 is the rotation limiter, 13 is the driving wheel connecting shaft, 14 is the driving wheel, 15 is the supporting wheel mounting shaft, 16 is the supporting wheel, 17 is the inner groove, 18 is the spring piece, 19 is the spring piece fixing screw, 20 is the detection table, 21 is the positioning base, 22 is the positioning screw, 23 is the limit base, 24 is the positioning hole, 25 is the mounting through hole. Detailed implementation mode

[0043] The accompanying drawings are only for illustrative purposes and should not be construed as limiting the patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced, which does not represent the dimensions of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0044] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0045] As Figures 1-10 shown, a liquid near-infrared detection device includes a detection positioning seat 1, a cuvette 2, a near-infrared probe 3, and an electric driving device 4 arranged on the detection positioning seat 1. A bushing 5 is arranged outside the cuvette 2, and the electric driving device 4 is connected to the bushing 5, so that the cuvette 2 rotates uniformly driven by the electric driving device 4. The near-infrared probe 3 is arranged on the detection positioning seat 1 to perform near-infrared detection on the liquid in the cuvette 2. A pressing block 6 for performing diffuse reflection on near-infrared light is arranged in the cuvette 2. By arranging the pressing block 6 in the cuvette 2, it can not only ensure that the gap between the bottom surface of the cuvette 2 and the bottom surface of the pressing block 6 remains consistent, so that when the solution is measured multiple times, there will be no problem that the amount of added liquid is too much or too little, resulting in inconsistent optical paths of near-infrared light, but also form uniform and good diffuse reflection through the bottom surface of the pressing block 6, so that more near-infrared light is reflected back to the near-infrared probe 3, enabling the near-infrared probe 3 to receive a stronger signal. In addition, by driving the cuvette 2 to rotate uniformly by the electric driving device 4, the components in the liquid to be detected can be evenly distributed in the cuvette 2, and after multiple rotations and removal of the mean value, the detection result of the liquid is more accurate.

[0046] As Figures 11-15As shown, the briquet 6 is detachably arranged on the cuvette 2. The lower surface of the briquet 6 is a uniform and smooth diffuse reflection surface. Among them, a holding handle 7 is provided at the top of the briquet 6, and a plurality of support feet 8 with the same height are provided at the bottom of the briquet 6. The briquet 6, the holding handle 7 and the support feet 8 are of an integral structure. Through the setting of the holding handle 7, it is convenient to take and place the briquet 6. And since the heights of the plurality of support feet 8 are the same, the bottom surface of the briquet 6 is parallel to the bottom surface of the cuvette 2. Therefore, the gap between the bottom surface of the cuvette 2 and the bottom surface of the briquet 6 is fixed, making the optical path of the near-infrared light consistent and facilitating the diffuse reflection of the near-infrared light. In addition, the setting of the support feet 8 can make the liquid to be detected fill the gap between the bottom surface of the cuvette 2 and the bottom surface of the briquet 6 when the briquet 6 is placed, facilitating the detection of the near-infrared light. In practical applications, the height of the support feet 8 can be set as needed, so as to adjust the height of the liquid to be detected, and all of them are within the protection scope of the present utility model.

[0047] In the present utility model, the electric driving device 4 includes a motor 9, a rotating shaft 10, a limit mounting seat 11, a rotation limiter 12, a driving wheel connecting shaft 13, a driving wheel 14, a supporting wheel mounting shaft 15 and a supporting wheel 16; the limit mounting seat 11 is arranged on the detection positioning seat 1, the motor 9 is rotatably arranged on the limit mounting seat 11 through the rotating shaft 10, and the rotation limiter 12 is arranged on the limit mounting seat 11 to limit the rotation angle of the motor 9; the driving wheel connecting shaft 13 is connected to the motor 9, and the driving wheel 14 is arranged on the driving wheel connecting shaft 13; the supporting wheel mounting shaft 15 is arranged on the detection positioning seat 1, the supporting wheel 16 is arranged on the supporting wheel mounting shaft 15, and the mounting heights of the supporting wheel 16 and the driving wheel 14 are flush with each other. Since the motor 9 is arranged on the limit mounting seat 11 through the rotating shaft 10, the motor 9 can rotate within a limited angle range. And due to the setting of the rotation limiter 12, the rotation angle of the motor 9 can be limited and reset. In practical applications, when the cuvette 2 needs to be placed, the motor 9 can be rotated by a certain angle, so as to facilitate the placement of the cuvette 2. After the cuvette 2 is placed, only need to loosen the motor 9. Under the action of the rotation limiter 12, the driving wheel 14 on the motor 9 presses on the bushing 5 of the cuvette 2, and the cuvette 2 is supported and pressed by the driving wheel 14 and the supporting wheel 16. When it is necessary to drive the cuvette 2 to rotate at a constant speed, the motor 9 drives the driving wheel 14 to rotate at a constant speed. Under the action of friction, the cuvette 2 starts to rotate at a constant speed.

[0048] In the present utility model, an inner groove 17 is provided on the bushing 5, and both the driving wheel 14 and the supporting wheel 16 are clamped in the inner groove 17 of the bushing 5. Through the arrangement of the inner groove 17, the driving wheel 14 and the supporting wheel 16 can be better pressed and fitted inside the bushing 5. Among them, the rotation limiter 12 includes a spring piece 18 and a spring piece fixing screw 19; one end of the spring piece 18 is installed on the limit mounting seat 11 through the spring piece fixing screw 19, and the other side of the spring piece 18 is in contact with the motor 9, so that the driving wheel 14 is pressed and fitted on the bushing 5. By utilizing the elasticity of the spring piece 18 itself, the driving wheel 14 on the motor 9 can be pressed and fitted on the bushing 5. When it is necessary to take out the cuvette 2, only by overcoming the elastic force of the spring piece 18 to turn the motor 9 by a certain angle, the cuvette 2 can be taken out, which is simple and convenient. In the present utility model, the supporting wheel mounting shaft 15 and the supporting wheel 16 are at least one group. In actual application, according to the weight and size of the cuvette 2, the installation position and the installation quantity of the supporting wheel mounting shaft 15 and the supporting wheel 16 can be set, so that the force on the bottom of the cuvette 2 is more uniform, thereby facilitating the cuvette 2 to rotate evenly under the drive of the motor 9.

[0049] Among them, the detection and positioning seat 1 includes a detection table 20, a positioning base 21, positioning screws 22 and a limit base 23; the positioning base 21 is arranged on the detection table 20; a positioning hole 24 is provided on the detection table 20, and a mounting through hole 25 is provided on the limit base 23. After the positioning screw 22 passes through the mounting through hole 25 on the limit base 23, it is fixed in the positioning hole 24 of the detection table 20. Through the setting of the positioning base 21, it is convenient to set and install the electric drive device 4 and the cuvette 2. And because the limit base 23 is detachably arranged on the detection table 20 through the positioning screw 22, it can protect the detection table 20 while making the detection table 20 more beautiful. In the present utility model, the cuvette 2 is made of quartz material, and the bushing 5 is made of rubber material. The cuvette 2 made of quartz material can facilitate the scanning of the liquid in the cuvette 2 after the near-infrared light is transmitted. The bushing 5 made of rubber material can not only prevent the cuvette 2 from directly contacting the driving wheel 14 and the supporting wheel 16, reducing the influence of hard friction on the cuvette 2, but also strengthening the friction between the driving wheel 14 and the supporting wheel 16 and the cuvette 2, so that the cuvette 2 can rotate uniformly under the drive of the motor 9. In addition, the pressing block 6, the holding handle 7 and the supporting feet 8 are all made of metal material or aluminum alloy or stainless steel material. The pressing block 6 made of metal material or aluminum alloy or stainless steel material can better diffuse-reflect the near-infrared light due to the flat and smooth characteristics of its lower surface, so that more near-infrared light is reflected back to the near-infrared probe 3, effectively improving the signal intensity received by the near-infrared probe 3, thus making the detection of the liquid components by the liquid near-infrared detection device more accurate. And the integrated pressing block 6, holding handle 7 and supporting feet 8 can effectively simplify the overall structure of the pressing block 6, which is simple and practical.

[0050] Embodiment

[0051] In this embodiment, the motor is rotatably arranged on the limit mounting seat through a rotating shaft, and one end of the spring piece is installed on the limit mounting seat through a spring piece fixing screw, and the other side of the spring piece is attached to the motor, so that the driving wheel is pressed on the bushing. By utilizing the elasticity of the spring piece itself, the driving wheel on the motor can be pressed on the bushing. When it is necessary to put in or take out the cuvette, only need to overcome the elasticity of the spring piece to turn the motor by a certain angle, and then the cuvette can be put in or taken out. Through a simple structure, the placed cuvette can be positioned and pressed.

[0052] When it is necessary to detect the components of a liquid, the liquid to be detected can be first poured into a cuvette, and a pressing block is placed in the cuvette. Since support feet are provided at the bottom of the pressing block and the heights between multiple support feet are the same, the bottom surface of the pressing block is parallel to the bottom surface of the cuvette. At this time, the gap between the bottom surface of the cuvette and the bottom surface of the pressing block is fixed, so that when the liquid is detected by near-infrared multiple times, no matter how much liquid is put in, the optical path of the near-infrared light during detection is consistent. At the same time, since the bottom surface of the pressing block forms uniform and good diffuse reflection, more near-infrared light is reflected back to the near-infrared probe, enabling the near-infrared probe to receive a stronger signal. In addition, the cuvette is driven to rotate uniformly by an electric driving device, so that the components in the liquid to be detected can be evenly distributed in the cuvette, and after multiple rotations and removal of the mean value, the detection result of the liquid is more accurate.

[0053] In the figure, the description of the positional relationship is only for illustrative purposes and should not be construed as a limitation of this patent; obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A liquid near-infrared detection device, comprising a detection positioning seat, a cuvette, a near-infrared probe and an electric drive device arranged on the detection positioning seat, characterized in that: A bushing is provided on the outer side of the cuvette, and the electric drive device and the bushing are connected to each other, so that the cuvette rotates at a constant speed under the drive of the electric drive device; The near infrared probe is arranged on the detection positioning seat for performing near infrared detection on the liquid in the colorimetric dish; A pressing block for diffusely reflecting near-infrared light is arranged in the cuvette.

2. The liquid near-infrared detection device according to claim 1, characterized in that: The pressing block is detachably arranged on the cuvette, and the lower surface of the pressing block is a uniform and smooth diffuse reflection surface.

3. The liquid near-infrared detection device according to claim 1, characterized in that: A gripping handle is provided on the top of the pressing block, and a plurality of supporting feet with the same height are provided on the bottom of the pressing block. The pressing block, the gripping handle and the supporting feet are an integrated structure.

4. The liquid near-infrared detection device according to claim 1, characterized in that: The electric drive device comprises a motor, a rotating shaft, a limit mounting seat, a rotation limiter, a driving wheel connecting shaft, a driving wheel, a supporting wheel mounting shaft and a supporting wheel; The limit mounting seat is arranged on the detection positioning seat, the motor is rotatably arranged on the limit mounting seat through the rotating shaft, and the rotation limiter is arranged on the limit mounting seat to limit the rotation angle of the motor; The driving wheel connecting shaft is connected to the motor, and the driving wheel is arranged on the driving wheel connecting shaft; The supporting wheel installation shaft is arranged on the detection positioning seat, the supporting wheel is arranged on the supporting wheel installation shaft, and the installation height between the supporting wheel and the driving wheel is flush.

5. The liquid near-infrared detection device according to claim 4, characterized in that: The bushing is provided with an inner groove, and the driving wheel and the supporting wheel are both clamped in the inner groove of the bushing.

6. The liquid near-infrared detection device according to claim 4, characterized in that: The rotation limiter comprises a spring sheet and a spring sheet fixing screw; One end of the spring sheet is mounted on the limit mounting seat through a spring sheet fixing screw, and the other side of the spring sheet is fitted with the motor so that the driving wheel is pressed onto the bushing.

7. The liquid near-infrared detection device according to claim 4, characterized in that: The supporting wheel mounting shaft and the supporting wheel form at least one set.

8. The liquid near-infrared detection device according to claim 1, characterized in that: The detection and positioning seat comprises a detection platform, a positioning base, a positioning screw and a limit base; The positioning base is arranged on the testing platform; The detection platform is provided with a positioning hole, the limiting base is provided with a mounting through hole, and the positioning screw passes through the mounting through hole on the limiting base and is fixed on the positioning hole of the detection platform.

9. The liquid near-infrared detection device according to claim 1, characterized in that: The cuvette is made of quartz material, and the bushing is made of rubber material.

10. The liquid near-infrared detection device according to claim 3, characterized in that: The pressing block, the holding handle and the supporting feet are all made of metal material or aluminum alloy or stainless steel material.

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