Trace element detection instrument

Abstract

The invention provides a trace element detection instrument. The trace element detection instrument comprises a foldable and turnover shell; the liquid supply mechanism comprises a test tube with a peristaltic pump, and the test tube is provided with a replaceable filter membrane, a liquid level alarm sensor and a modular fixing seat; the reaction tank replacement mechanism realizes elastic installation of the reaction tank through a first elastic assembly at the tail part of the six-way valve; the optical measurement module detects an excitation light signal through a laser transmitter, a probe sensor and a photoelectric sensor and converts the excitation light signal into concentration data; the six-way valve is connected with the flow velocity measurement module and calculates the liquid flow velocity through the glass tube and the upper and lower sensors; waste liquid is discharged into a middle waste liquid pool through a waste liquid head linked with the pressing block. Through the foldable shell, the elastic docking mechanism, low residual fluid control, real-time flow rate monitoring and automatic waste liquid treatment, high precision, high efficiency and high adaptability of the detection process are achieved, and the device is suitable for multi-scene trace element analysis such as clinical detection and environment monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring equipment, and in particular to a trace element detection instrument. Background Art

[0002] Element detection is extremely critical in many fields such as environmental monitoring, biomedicine, and industrial production. It can help people understand the composition of substances, master the mechanism of chemical reactions, ensure product quality, maintain the ecological environment and human health, etc. Although traditional element detection methods can achieve certain detection goals, they are gradually lagging behind in terms of operational convenience, detection accuracy, environmental adaptability and functional integrity, and are difficult to adapt to the current diverse and efficient detection demands.

[0003] Insufficient existing technology: 1. Inconvenient operation and space limitations: The structural design of most traditional trace element detection instruments is not sophisticated enough, and they often cannot provide sufficient and flexible operating space during operation. There is also a lack of effective integration and utilization of space during the measurement process, which is not conducive to improving the smoothness and convenience of detection operations.

[0004] 2. The problem of light interference is prominent: When detecting trace elements, interference from external light often becomes a problem that affects measurement accuracy. Many existing instruments are not equipped with complete light-shielding measures, resulting in poor accuracy of test results.

[0005] 3. The installation and replacement of the reaction pool are cumbersome: The installation method of the reaction pool in the existing technology is not convenient enough. It mostly adopts a relatively fixed connection and lacks a flexible installation structure, which makes the replacement of the reaction pool time-consuming and labor-intensive. In addition, improper installation may affect the detection accuracy, which is not conducive to the rapid and efficient continuous detection tasks.

[0006] 4. Imperfect waste liquid management: Most instruments are not designed with reasonable discharge, collection and monitoring mechanisms for the waste liquid generated during the testing process, which can easily cause waste liquid overflow, contaminate the instrument and the experimental environment, and may also affect the testing process due to failure to detect the full amount of waste liquid in time.

[0007] 5. Lack of liquid flow rate measurement: Traditional trace element detection instruments often ignore the accurate measurement of liquid flow rate. The flow rate parameter has an important impact on the stability and accuracy of the detection process. The lack of this function will make the detection process control less accurate.

[0008] 6. Large amounts of residual liquid and inconvenient replacement: The valves and other components of some instruments are poorly designed, resulting in large amounts of residual liquid, which not only wastes reagents but also easily causes cross-contamination. At the same time, its components are difficult to replace, which is not conducive to the maintenance and long-term stable operation of the instrument.

[0009] Therefore, the existing technology has deficiencies and needs further improvement. Summary of the Invention

[0010] In view of the problems existing in the prior art, the present invention provides a trace element detection instrument.

[0011] To achieve the above object, the specific solutions of the present invention are as follows: The present invention provides a trace element detection instrument, comprising: The housing consists of a box body, a front cover, an upper cover, and an operation panel. The operation panel is mounted on the front side of the box body, and the front cover and upper cover are foldable and flippable. They are opened during operation to expand the operating space, and closed during measurement to save space and provide a fully light-proof and sealed environment to reduce interference from external light on the measurement. The liquid supply mechanism includes a plurality of test tubes mounted on the operation panel, each test tube being provided with a corresponding peristaltic pump; Reaction pool replacement mechanism, including reaction pool, six-way valve, optical fiber connector, The six-way valve is movably mounted on the operation panel, and a first elastic component is provided at the tail of the six-way valve. By pushing the six-way valve, the reaction pool is elastically mounted between the optical fiber connector and the six-way valve using the action of the first elastic component; The six-way valve is connected to the peristaltic pump of the liquid supply mechanism; The optical measurement module includes a laser emitter, a probe sensor and a photoelectric sensor. The laser emitter is connected to the optical fiber connector through an optical fiber. The probe sensor is installed inside the reaction pool. The photoelectric sensor is installed on the side of the probe sensor. The photoelectric sensor is used to detect the excitation light signal in the reaction pool and convert it into concentration data.

[0012] Furthermore, the first elastic component includes a first spring, a movable shaft, and a fixed shaft; The movable shaft is installed at the rear end of the six-way valve, one end of the fixed shaft is installed on the operating panel and the other end is inserted into the movable shaft, the first spring is located inside the movable shaft and elastically docks with the front end of the fixed shaft to achieve elastic docking between the movable shaft and the fixed shaft.

[0013] Furthermore, a liquid outlet is provided on the side wall of the reaction tank, and a pressing block is provided below the liquid outlet; The connection between the reaction pool and the six-way valve, and the connection between the liquid outlet of the reaction pool and the pressing block are all provided with silicone sealing rings; A second elastic component is provided below the pressing block. The pressing block is also provided with a waste liquid head which is connected to the reaction tank and is used for discharging waste liquid.

[0014] Furthermore, a left fixing component and a right fixing component are installed on the operation panel; Test tubes connected to peristaltic pumps are respectively installed on the left fixing component and the right fixing component.

[0015] Furthermore, a waste liquid pool is provided between the left fixed component and the right fixed component for receiving waste liquid discharged from the waste liquid head, and a waste liquid full alarm is provided on the side wall of the waste liquid pool.

[0016] Furthermore, the upper opening of the test tube is provided with a filter membrane outer sleeve, and a filter membrane inner sleeve is superimposed on the filter membrane outer sleeve. A filter membrane is provided between the filter membrane inner sleeve and the filter membrane outer sleeve. Filter membranes of different pore sizes can be replaced according to different filtering needs. A test tube plug is also provided at the upper opening of the filter membrane inner sleeve.

[0017] Furthermore, a liquid level alarm sensor is provided on the side wall of the test tube.

[0018] Furthermore, the upper end and the lower end of the test tube are respectively provided with a fixed upper seat and a fixed lower seat for mounting the test tube on the left fixing assembly or the right fixing assembly; The fixed lower seat is provided with a liquid outlet for connecting the lower end of the test tube with the peristaltic pump.

[0019] Furthermore, the six-way valve is also connected to a flow rate measurement module and a peristaltic pump outlet; The flow rate measurement module includes: a glass tube, an upper sensor, and a lower sensor; Both ends of the glass tube are connected to a six-way valve and a waste liquid outlet through a hose, and the diameter of the hose is smaller than the diameter of the glass tube; The upper sensor and the lower sensor are mounted on the outer wall of the glass tube and are spaced apart along the axial direction of the glass tube; The measured liquid enters the glass tube from the bottom. The first time is recorded when the liquid reaches the lower sensor. The second time is recorded when the liquid continues to rise and reaches the upper sensor. The time difference between the two is obtained. The liquid volume is calculated based on the distance between the upper and lower sensors and the inner diameter of the glass to obtain the liquid flow rate.

[0020] Furthermore, the six-way valve has no valve core inside, and each docking port is provided with a one-way valve. The residual liquid volume is ≤0.1μL and is easy to replace.

[0021] The technical solution of the present invention has the following beneficial effects: 1. Improved operational convenience Flexible use of space: The front cover and upper cover can be folded and flipped. When opened during operation, the operating space can be expanded, making detection operations more convenient; when closed during measurement, space can be saved, making it easier to store and move the instrument, thereby improving the instrument's spatial adaptability and ease of operation.

[0022] Quick replacement of reaction pool: A first elastic component is set at the tail of the six-way valve. By pushing the six-way valve, the reaction pool can be elastically installed between the optical fiber connector and the six-way valve using the elastic component, realizing quick installation and replacement of the reaction pool and improving detection efficiency. It is especially suitable for detection scenarios that require frequent replacement of reaction pools.

[0023] 2. Improved measurement accuracy Effectively reduce light interference: When the front cover and top cover are closed, they can provide a completely light-proof and sealed environment inside the instrument, minimizing the interference of external light on the measurement, thereby improving the accuracy of the optical measurement module's detection of excitation light signals and ensuring the reliability of trace element concentration data.

[0024] Accurate flow rate measurement: The flow rate measurement module, through the glass tube, upper sensor, and lower sensor configuration, accurately measures liquid flow rate. Liquid volume and flow rate are calculated based on the time difference recorded by the sensors and related parameters, providing more accurate flow rate data for the testing process, helping to optimize testing conditions and improve detection accuracy.

[0025] Excellent sealing performance: Silicone sealing rings are installed at the joints between the reaction cell and the six-way valve, as well as between the liquid outlet of the reaction cell and the pressing block, which effectively prevents liquid leakage, ensures the stability of the detection process, and avoids measurement errors and instrument failures caused by liquid leakage.

[0026] 3. Structural optimization and service life extension Durable elastic component: The first elastic component adopts the structure of a first spring, a movable shaft and a fixed shaft. The elastic docking method between the movable shaft and the fixed shaft not only realizes the flexible installation of the reaction pool, but also the elastic effect of the spring can buffer mechanical impact and extend the service life of related components.

[0027] Efficient waste liquid management: A waste liquid pool is set between the left and right fixed components on the operation panel to receive waste liquid discharged from the waste liquid head. A waste liquid full alarm is set on the side wall of the waste liquid pool to remind users to deal with waste liquid in time, prevent waste liquid overflow and damage to the instrument, and also facilitate keeping the laboratory environment clean.

[0028] The filter membrane is cleverly designed: the upper opening of the test tube houses an outer membrane sleeve and an inner membrane sleeve. Filters of varying pore sizes can be placed between the two sleeves and replaced to meet diverse filtration needs, enhancing the instrument's versatility and flexibility. Furthermore, a test tube stopper located at the upper opening of the inner membrane sleeve prevents external impurities from entering the test tube, ensuring the purity of the test sample.

[0029] 4. Complete detection function Powerful optical measurement function: The optical measurement module includes a laser emitter, a probe sensor and a photoelectric sensor. The laser emitter is connected to the optical fiber connector through an optical fiber, the probe sensor is installed inside the reaction pool, and the photoelectric sensor is installed on the side of the probe sensor. It can accurately detect the excitation light signal in the reaction pool and convert it into concentration data, realizing the precise detection of trace elements.

[0030] Low residual liquid and easy replacement: The six-way valve has no internal valve core, and each interface is equipped with a one-way valve. Residual liquid is ≤ 0.1μL and is easy to replace. This design not only reduces reagent waste and testing costs, but also effectively prevents residual liquid from interfering with subsequent testing, improving the accuracy of test results, and facilitating instrument maintenance and cleaning.

[0031] 5. Enhanced security and stability Real-time monitoring of liquid level: The liquid level alarm sensor installed on the side wall of the test tube can monitor the liquid level in the test tube in real time. When the liquid level is too low, it will promptly issue an alarm signal to remind the user to add liquid, avoiding the instrument idling or detection interruption due to insufficient liquid, thus ensuring the continuity and safety of the detection process.

[0032] High overall stability: The overall structural design of the instrument is reasonable, and the connections between the various components are tight and stable. For example, the upper and lower ends of the test tube are respectively provided with a fixed upper seat and a fixed lower seat for mounting it on the left fixed component or the right fixed component. The liquid outlet of the fixed lower seat is connected to the peristaltic pump. This structural design ensures the stability of the entire liquid supply system and improves the reliability and stability of the instrument during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a perspective view of the present invention in an opened state; Figure 2 It is a front view of the present invention in an open state; Figure 3 is a perspective view of the closed state of the present invention; Figure 4 is a front view of the operating panel of the present invention; Figure 5 is a cross-sectional view of the present invention; Figure 6 The invention relates to a quick-replacement structure for a reaction pool.

[0034] Figure annotation: 1. Box body; 2. Front cover; 3. Upper cover; 4. Operation panel; 5. Test tube; 6. Peristaltic pump; 7. Reaction pool; 8. Six-way valve; 9. Fiber optic connector; 10. First elastic component; 11. First spring; 12. Movable shaft; 13. Fixed shaft; 14. Liquid outlet; 15. Press block; 16. Second elastic component; 17. Waste liquid head; 18. Left fixed component; 19. Right fixed component; 20. Waste liquid pool; 21. Waste liquid full alarm; 22. Filter membrane outer cover; 23. Filter membrane inner cover; 24. Filter membrane; 25. Test tube plug; 26. Liquid level alarm sensor; 27. Fixed upper seat; 28. Fixed lower seat; 29. Liquid outlet; 30. Flow rate measurement module; 31. Glass tube; 32. Upper sensor; 33. Lower sensor; 34. Liquid; 35. Fiber optic. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," "front," "rear," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] Combine Figures 1-6 As shown, the present invention provides a trace element detection instrument, comprising: The housing is composed of a box body 1, a front cover 2, an upper cover 3, and an operation panel 4; the operation panel 4 is mounted on the front side of the box body 1, and the front cover 2 and the upper cover 3 are foldably mounted on the front and upper sides of the box body 1. They are opened during operation to expand the operating space, and closed during measurement to save space and provide a fully light-proof and sealed environment to reduce interference from external light on the measurement; The liquid supply mechanism includes a plurality of test tubes 5 mounted on the operation panel 4, and each test tube 5 is provided with a corresponding peristaltic pump 6; The reaction pool replacement mechanism includes a reaction pool 7, a six-way valve 8, and an optical fiber connector 9. The six-way valve 8 is movably mounted on the operation panel 4. A first elastic component 10 is provided at the tail of the six-way valve 8. By pushing the six-way valve 8, the reaction pool 7 is elastically mounted between the optical fiber connector 9 and the six-way valve 8 using the action of the first elastic component 10. The six-way valve 8 is connected to the peristaltic pump 6 of the liquid supply mechanism; The optical measurement module includes a laser emitter, a probe sensor and a photoelectric sensor. The laser emitter is connected to the optical fiber connector 9 through an optical fiber 35. The probe sensor is installed inside the reaction pool 7. The photoelectric sensor is installed on the side of the probe sensor. The photoelectric sensor is used to detect the excitation light signal in the reaction pool 7 and convert it into concentration data.

[0040] The first elastic component 10 includes a first spring 11, a movable shaft 12, and a fixed shaft 13; The movable shaft 12 is installed at the rear end of the six-way valve 8, one end of the fixed shaft 13 is installed on the operating panel 4 and the other end is inserted into the movable shaft 12, and the first spring 11 is located inside the movable shaft 12 and elastically docked with the front end of the fixed shaft 13 to achieve elastic docking between the movable shaft 12 and the fixed shaft 13.

[0041] A liquid outlet 14 is further provided on the side wall of the reaction tank 7, and a pressing block 15 is provided below the liquid outlet 14; The connection between the reaction pool 7 and the six-way valve 8, and the connection between the liquid outlet end 14 of the reaction pool 7 and the pressing block 15 are both provided with silicone sealing rings; A second elastic component 16 is provided below the pressing block 15 . The pressing block 15 is also provided with a waste liquid head 17 . The waste liquid head 17 is connected to the reaction tank 7 and is used to discharge waste liquid.

[0042] The operation panel 4 is provided with a left fixing component 18 and a right fixing component 19; The left fixing assembly 18 and the right fixing assembly 19 are respectively mounted with a test tube 5 connected to a peristaltic pump 6 .

[0043] A waste liquid pool 20 is provided between the left fixing assembly 18 and the right fixing assembly 19 for receiving waste liquid discharged from the waste liquid head 17 , and a waste liquid full alarm 21 is provided on the side wall of the waste liquid pool 20 .

[0044] The upper end opening of the test tube 5 is provided with a filter membrane outer sleeve 22, and a filter membrane inner sleeve 23 is superimposed on the filter membrane outer sleeve 22. A filter membrane 24 is provided between the filter membrane inner sleeve 23 and the filter membrane outer sleeve 22. The filter membrane 24 with different pore sizes can be replaced according to different filtering needs. A test tube plug 25 is also provided at the upper end opening of the filter membrane inner sleeve 23.

[0045] A liquid level alarm sensor 26 is also provided on the side wall of the test tube 5 .

[0046] The upper end and lower end of the test tube 5 are respectively provided with a fixed upper seat 27 and a fixed lower seat 28 for mounting the test tube 5 on the left fixing assembly 18 or the right fixing assembly 19; The fixed lower seat 28 is provided with a liquid outlet 29 for connecting the lower end of the test tube 5 with the peristaltic pump 6 .

[0047] The six-way valve 8 is also connected to the flow rate measurement module 30 and the peristaltic pump outlet; The flow rate measurement module 30 includes: a glass tube 31, an upper sensor 32, and a lower sensor 33; The two ends of the glass tube 31 are connected to the six-way valve 8 and the waste liquid outlet through a hose, and the diameter of the hose is smaller than the diameter of the glass tube 31; The upper sensor 32 and the lower sensor 33 are mounted on the outer wall of the glass tube 31 and are spaced apart along the axial direction of the glass tube 31; The measured liquid 34 enters the glass tube 31 from the bottom of the glass tube 31. The first time is recorded when the liquid 34 reaches the lower sensor 33. The second time is recorded when the liquid 34 continues to rise and reaches the upper sensor 32. The time difference between the two times is obtained. The liquid volume is calculated based on the distance between the upper sensor 32 and the lower sensor 33 and the inner diameter of the glass to obtain the liquid flow rate.

[0048] There is no valve core inside the six-way valve 8, and a one-way valve is provided at each docking port. The residual liquid amount is ≤0.1 μL, and it is easy to replace.

[0049] The principles of the present invention are as follows: Folding housing and fully light-proof sealed environment control Expansion of operating space: The shell consists of a box body 1, a front cover 2, and an upper cover 3. The front cover 2 and the upper cover 3 are foldable and flippable. They can be unfolded to expand the operating space during operation, and closed to form a fully enclosed structure during measurement to isolate interference from external light sources.

[0050] Optical signal protection: In the closed state, the operation panel 4 and the reaction pool 7 are in a completely light-proof environment, reducing the interference of stray light on the optical detection module (such as photoelectric sensor) and ensuring the accuracy of the excitation light signal detection.

[0051] Multi-channel fluid supply and fluid control Multi-test tube liquid supply system: The liquid supply mechanism includes multiple independent test tubes 5, each of which is independently controlled by a peristaltic pump 6 to control the flow rate, supporting parallel processing of multiple reagents / samples (such as simultaneous detection of elements such as iron, zinc, and copper).

[0052] Modular filter membrane design: The upper end of the test tube 5 is provided with a filter membrane outer sleeve 22 + a filter membrane inner sleeve 23 combination, and filter membranes 24 of different pore sizes (such as 0.22μm / 0.45μm) can be replaced to adapt to pre-treatment requirements such as protein separation and particle filtration.

[0053] Liquid level monitoring: The liquid level alarm sensor 26 on the side wall of the test tube 5 monitors the liquid remaining in real time to prevent the pump from running dry.

[0054] Rapid reaction cell replacement and low residue control Spool-less six-way valve design: The six-way valve 8 has no traditional spool structure inside. A one-way valve is set at each docking port. The elastic component (first spring 11 + movable shaft 12) pushes the valve body to elastically dock with the reaction pool 7 and optical fiber connector 9, allowing for quick replacement of the reaction pool 7. The liquid residual volume is ≤0.1μL (the residual volume of the traditional six-way valve is >0.5μL).

[0055] Fluid path switching: The six-way valve 8 is connected to multiple peristaltic pumps 6, and the fluid path is switched by moving the valve body position to achieve accurate delivery of different reagents / samples to the reaction pool 7.

[0056] Optimized sealing performance: Silicone sealing rings are used at the joints between the reaction pool 7 and the six-way valve 8, and at the joints between the liquid outlet 14 and the pressing block 15 to prevent leakage of high-pressure fluid.

[0057] Optical detection and signal processing Laser excitation and fiber transmission: The laser emitter transmits the excitation light to the reaction cell 7 through the optical fiber 35, and works in conjunction with the probe sensor to excite the trace elements in the sample to produce characteristic spectra.

[0058] Dual sensor detection mechanism: Probe sensor: real-time monitoring of the liquid state (such as temperature and mixing uniformity) in the reaction tank 7; Photoelectric sensor: detects the fluorescence or absorption spectrum of trace elements after excitation, converts the light signal into an electrical signal, and calculates the concentration data based on the Lambert-Beer law.

[0059] Optical signal separation design: The laser emitter and the reaction pool 7 are isolated by the optical fiber 35 to reduce the interference of heat sources on optical detection.

[0060] Flow rate measurement and waste liquid treatment Glass tube flow rate monitoring: Upper and lower sensors (upper sensor 32 and lower sensor 33) are set at both ends of the glass tube 31 connected to the six-way valve 8. The flow rate is calculated by the difference in liquid rise time (error <1%) to ensure accurate control of the reagent amount in the reaction tank 7.

[0061] Automatic waste liquid discharge: The waste liquid in the reaction tank 7 is discharged to the waste liquid tank 20 through the pressing block 15 and the second elastic component 16. The waste liquid full alarm 21 automatically prompts the capacity status to reduce manual intervention.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the scope of the invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the protection scope of the present invention.

Claims

1. A trace element detection instrument, characterized in that: include: The housing consists of a box body, a front cover, an upper cover, and an operation panel. The operation panel is mounted on the front side of the box body, and the front cover and upper cover are foldable and flippable. They are opened during operation to expand the operating space, and closed during measurement to save space and provide a fully light-proof and sealed environment to reduce interference from external light on the measurement. The liquid supply mechanism includes a plurality of test tubes mounted on the operation panel, each test tube being provided with a corresponding peristaltic pump; Reaction pool replacement mechanism, including reaction pool, six-way valve, optical fiber connector, The six-way valve is movably mounted on the operation panel, and a first elastic component is provided at the tail of the six-way valve. By pushing the six-way valve, the reaction pool is elastically mounted between the optical fiber connector and the six-way valve using the action of the first elastic component; The six-way valve is connected to the peristaltic pump of the liquid supply mechanism; The optical measurement module includes a laser emitter, a probe sensor and a photoelectric sensor. The laser emitter is connected to the optical fiber connector through an optical fiber. The probe sensor is installed inside the reaction pool. The photoelectric sensor is installed on the side of the probe sensor. The photoelectric sensor is used to detect the excitation light signal in the reaction pool and convert it into concentration data.

2. The trace element detection instrument according to claim 1, characterized in that: The first elastic component includes a first spring, a movable shaft, and a fixed shaft; The movable shaft is installed at the rear end of the six-way valve, one end of the fixed shaft is installed on the operating panel and the other end is inserted into the movable shaft, the first spring is located inside the movable shaft and elastically docks with the front end of the fixed shaft to achieve elastic docking between the movable shaft and the fixed shaft.

3. The trace element detection instrument according to claim 1, characterized in that: A liquid outlet is also provided on the side wall of the reaction tank, and a pressing block is provided below the liquid outlet; The connection between the reaction pool and the six-way valve, and the connection between the liquid outlet of the reaction pool and the pressing block are all provided with silicone sealing rings; A second elastic component is provided below the pressing block. The pressing block is also provided with a waste liquid head which is connected to the reaction tank and is used for discharging waste liquid.

4. The trace element detection instrument according to claim 3, characterized in that: The operation panel is equipped with a left fixing component and a right fixing component; Test tubes connected to peristaltic pumps are respectively installed on the left fixing component and the right fixing component.

5. The trace element detection instrument according to claim 4, characterized in that: A waste liquid pool is provided between the left fixed component and the right fixed component for receiving waste liquid discharged from the waste liquid head, and a waste liquid full amount alarm is provided on the side wall of the waste liquid pool.

6. The trace element detection instrument according to claim 3, characterized in that: The upper opening of the test tube is provided with a filter membrane outer sleeve, and a filter membrane inner sleeve is superimposed on the filter membrane outer sleeve. A filter membrane is provided between the filter membrane inner sleeve and the filter membrane outer sleeve. Filter membranes of different pore sizes can be replaced according to different filtering needs. A test tube plug is also provided at the upper opening of the filter membrane inner sleeve.

7. The trace element detection instrument according to claim 4, characterized in that: A liquid level alarm sensor is also provided on the side wall of the test tube.

8. The trace element detection instrument according to claim 4, characterized in that: The upper end and lower end of the test tube are respectively provided with a fixed upper seat and a fixed lower seat for mounting the test tube on the left fixing assembly or the right fixing assembly; The fixed lower seat is provided with a liquid outlet for connecting the lower end of the test tube with the peristaltic pump.

9. The trace element detection instrument according to claim 1, characterized in that: The six-way valve is also connected to a flow rate measurement module and a peristaltic pump outlet; The flow rate measurement module includes: a glass tube, an upper sensor, and a lower sensor; Both ends of the glass tube are connected to a six-way valve and a waste liquid outlet through a hose, and the diameter of the hose is smaller than the diameter of the glass tube; The upper sensor and the lower sensor are mounted on the outer wall of the glass tube and are spaced apart along the axial direction of the glass tube; The measured liquid enters the glass tube from the bottom. The first time is recorded when the liquid reaches the lower sensor. The second time is recorded when the liquid continues to rise and reaches the upper sensor. The time difference between the two is obtained. The liquid volume is calculated based on the distance between the upper and lower sensors and the inner diameter of the glass to obtain the liquid flow rate.

10. The trace element detection instrument according to claim 1, characterized in that: There is no valve core inside the six-way valve, and a one-way valve is provided at each docking port. The residual liquid volume is ≤0.1μL and is easy to replace.

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