Liquid Sampling Systems

Abstract

The present disclosure relates to the field of safety detection technology, and provides a liquid sampling system for liquid detection equipment, including: a bracket; a sampling tube, the cross-sectional area of ​​the opening of the sampling tube is larger than the cross-sectional area of ​​the sampling tube body; a sampling tube base, the sampling tube is arranged on the sampling tube base; a guide rail is arranged on the bracket, and the sampling tube base is slidably connected to the guide rail. The liquid sampling system disclosed in the present disclosure can quickly and conveniently sample the liquid to be tested without causing liquid overflow. The operation of the liquid sampling system can be fully automatically controlled, saving labor and professional requirements for personnel. Different liquids can be poured into different waste liquid barrels according to the test results to reduce danger.

Description

Technical Field

[0001] The present disclosure relates to the field of safety detection technology, and in particular to a liquid sampling system. Background Art

[0002] In the actual use of liquid detection equipment such as Raman liquid security detectors, if opaque packaging is encountered, the Raman spectrometer cannot perform detection. At this time, it is usually necessary to open the opaque packaging, pour a small part of the liquid in the packaging into a test tube, and then place the test tube in front of the Raman spectrometer probe for detection.

[0003] The traditional liquid sampling method described above has many inconveniences, including the following: First, when pouring the liquid in the opaque package into the test tube, due to the narrow mouth of the test tube, the liquid may deviate from the test tube and contact the operator's skin. If it is a toxic liquid, it will cause damage to the human body and the environment. Secondly, Raman detection only requires a certain amount of liquid, and how to accurately control the dosage of the sampling liquid is also difficult to control, resulting in inconvenience in sampling.

[0004] Therefore, designing a new liquid sampling system is a technical problem that needs to be solved urgently.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0006] The purpose of the present disclosure is to provide a liquid sampling system, thereby overcoming one or more problems caused by the limitations and defects of the relevant technologies at least to a certain extent, and only one of the technical problems needs to be solved.

[0007] According to an embodiment of the present disclosure, a liquid sampling system for a liquid detection device is disclosed, comprising:

[0008] bracket;

[0009] A sampling tube, wherein the cross-sectional area of ​​the opening of the sampling tube is larger than the cross-sectional area of ​​the main body of the sampling tube;

[0010] A sampling tube base, on which the sampling tube is arranged;

[0011] A guide rail is arranged on the bracket, and the sampling tube base is slidably connected to the guide rail, so that the sampling tube and the sampling tube base can move along the guide rail.

[0012] According to an embodiment of the present disclosure, a protrusion is provided on the sampling tube base, and the guide rail has a groove that can accommodate the protrusion and extends along the extension direction of the guide rail, wherein the sampling tube base and the guide rail are slidably connected through the combination of the protrusion and the groove.

[0013] According to an embodiment of the present disclosure, the guide rail extends substantially in a straight direction.

[0014] According to an embodiment of the present disclosure, the guide rail has two parts respectively extending along two line segments at a certain angle, or the guide rail forms a closed figure.

[0015] According to an embodiment of the present disclosure, the liquid sampling system further includes a liquid level detection device for detecting the liquid level in the sampling tube.

[0016] According to an embodiment of the present disclosure, the liquid sampling system further includes a liquid level warning device for issuing a warning when the liquid in the sampling tube reaches a predetermined liquid level.

[0017] According to an embodiment of the present disclosure, the liquid sampling system further includes a waste liquid bucket for collecting waste liquid discharged from the sampling tube.

[0018] According to an embodiment of the present disclosure, there are multiple waste liquid barrels, each of which is used to hold waste liquid corresponding to the type of sample detected by the liquid detection device.

[0019] According to an embodiment of the present disclosure, the liquid sampling system further includes a position sensor or a position encoder for detecting the position of the sampling tube.

[0020] According to an embodiment of the present disclosure, the liquid sampling system further includes a valve, which is disposed at the bottom of the sampling tube, or disposed on a waste liquid discharge tube connected to the sampling tube.

[0021] According to an embodiment of the present disclosure, the valve is an electronic valve, which can communicate directly or indirectly with a position sensor or an encoder, and when the sampling tube moves to a predetermined position, the electronic valve opens.

[0022] According to an embodiment of the present disclosure, the predetermined position is near a specific waste liquid barrel corresponding to the detection result of the liquid.

[0023] According to an embodiment of the present disclosure, the liquid sampling system further includes a faucet for cleaning the sampling tube after the detection is completed or after the waste liquid is discharged.

[0024] According to one embodiment of the present disclosure, the liquid sampling system also includes a controller, which can communicate with the liquid level detection device and the position sensor / position encoder to control the liquid level warning device to warn and the movement of the sampling tube along the guide rail. The controller can also control the switching of the electronic valve and / or the switching of the faucet.

[0025] According to an embodiment of the present disclosure, the movement of the sampling tube along the guide rail, the opening and closing of the valve and / or the opening and closing of the faucet are manually controlled, and the sampling tube base is equipped with a locking mechanism.

[0026] According to an embodiment of the present disclosure, the sampling tube base is only provided on the main body of the sampling tube.

[0027] According to an embodiment of the present disclosure, the liquid detection device is a Raman spectrometer.

[0028] According to an embodiment of the present disclosure, a sample sampling position, a liquid detection position, a waste liquid discharge position and a faucet cleaning position are arranged in sequence on the guide rail.

[0029] According to some embodiments of the present disclosure, the liquid to be tested can be sampled quickly and conveniently without causing the liquid to overflow and come into contact with the skin.

[0030] In addition, the entire liquid sampling system can be controlled in a fully automatic manner to run automatically, saving manpower and professional requirements for personnel.

[0031] In addition, liquids with different characteristics can be poured into different waste liquid barrels according to the test results to reduce danger or perform different types of treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0033] Figure 1 A front view of a liquid sampling system according to an embodiment of the present disclosure is shown;

[0034] Figure 2 A right side view of a liquid sampling system according to an embodiment of the present disclosure is shown;

[0035] Figure 3 A front view showing a liquid sampling system according to another embodiment of the present disclosure;

[0036] Figure 4 A right side view of a liquid sampling system according to another embodiment of the present disclosure is shown;

[0037] Figure 5 A front view showing a sampling tube base according to another embodiment of the present disclosure; and

[0038] Figure 6 A front view of a liquid sampling system according to yet another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0039] The embodiments will now be described more fully with reference to the accompanying drawings. However, the embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0040] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0041] An exemplary embodiment of the present invention provides a liquid sampling system for a liquid detection device, comprising: a bracket; a sampling tube, the cross-sectional area of ​​the opening of the sampling tube is larger than the cross-sectional area of ​​the sampling tube body; a sampling tube base, the sampling tube is arranged on the sampling tube base; and a guide rail is arranged on the bracket, and the sampling tube base is slidably connected to the guide rail. The liquid sampling system of the present invention can quickly and conveniently sample the liquid to be tested, and will not cause the liquid to overflow and contact the skin. At the same time, the entire liquid sampling system can be controlled to run automatically in a fully automatic manner, saving manpower and professional requirements for personnel. In addition, liquids with different characteristics can be poured into different waste liquid barrels according to the test results to reduce danger, or perform different types of treatment.

[0042] Combine the following Figure 1-4 The liquid sampling system of the present disclosure is described in detail, wherein: Figure 1 A front view of a liquid sampling system according to an exemplary embodiment of the present invention is shown; Figure 2 A right side view of a liquid sampling system according to an exemplary embodiment of the present invention is shown; Figure 3 A front view showing a liquid sampling system according to another exemplary embodiment of the present invention; Figure 4 A right side view of a liquid sampling system according to another exemplary embodiment of the present invention is shown; Figure 5 A front view of a sampling tube base according to another embodiment of the present disclosure is shown; Figure 6 A front view of a liquid sampling system according to another embodiment of the present disclosure is shown. It should be particularly noted that the liquid detection devices in the following embodiments are all described using Raman spectrometers as examples, but the present disclosure is not limited thereto, and other types of liquid detection devices may also be used, such as liquid detection devices using absorption spectroscopy technology or liquid detection devices using fluorescence spectroscopy technology.

[0043] like Figure 1-6As shown, the liquid sampling system for the liquid detection device 1 includes a bracket 2, a sampling tube 3 and a sampling tube base 4, wherein the sampling tube 3 is arranged on the sampling tube base 4, and the sampling tube 3 may have a funnel-shaped opening; and a guide rail 5 is arranged on the bracket 2, and the sampling tube base 4 is slidably connected to the guide rail 5, so that the sampling tube 3 and the sampling tube base 4 can move along the guide rail 5. Among them, the sampling tube adopts a funnel-shaped opening, thereby avoiding the danger that the liquid may deviate from the sampling tube and contact the operator's skin, otherwise if it is a toxic liquid, it will cause damage to the human body and the environment. The present disclosure is not limited to the funnel-shaped opening, and the sampling tube 3 may also adopt openings of other shapes, as long as the area of ​​the opening is significantly larger than the cross-sectional area of ​​the sampling tube body to avoid the liquid from deviating from the sampling tube.

[0044] The sampling tube 3 and the sampling tube base 4 are preferably driven by electric power or magnetic field force to move along the guide rail 5, and a transmission mechanism may or may not be provided at this time. Of course, the sampling tube 3 and the sampling tube base 4 can also be moved by the user's hand, and for convenience, a locking mechanism such as a nut can also be provided to make the sampling tube 3 stay at a specific position.

[0045] The side of the sampling tube base 4 can be curved to ensure that when the sampling tube 3 and the sampling tube base 4 are lowered to the vicinity of the detection port of the liquid detection device 1, the sampling tube base 4 will not collide or contact with the liquid detection device 1. Figure 1 The double rail spacing in the sample tube base 4 can be larger than the double rail spacing in the sample tube base 4, or a single rail can be used. Figure 1 The width shown in FIG. is small and will not contact the liquid detection device 1 when descending. Further, as Figure 5 As shown, the height of the sampling tube base 4 can be reduced, that is, it is only arranged at the lower cylindrical main part of the sampling tube 3 but not at the funnel opening part. In this way, the width of the sampling tube base 4 can also be reduced so as not to contact the liquid detection device 1.

[0046] in, Figure 1-2 The liquid sampling device in which the sampling tube can move vertically up and down is shown. Figure 3-4 , 6 show a liquid sampling device in which the sampling tube can move both vertically and horizontally, which are described in detail below.

[0047] exist Figure 1-2In the embodiment shown in which the sampling tube can move vertically up and down, the guide rail 5 is a vertical guide rail extending in a substantially vertical direction, and the sampling tube can move vertically up and down through the vertical guide rail extending in the vertical direction. Generally speaking, the liquid detection device 1 can be set near the lower end of the vertical guide rail extending in the vertical direction. In the process of liquid sampling and detection, the sampling tube can first be moved along the vertical guide rail to the upper end of the vertical guide rail for liquid sampling. After completing the liquid sampling, the sampling tube with the liquid to be detected is moved along the vertical guide rail to the lower end of the vertical guide rail. At this time, the liquid detection device 1 set near the lower end of the vertical guide rail extending in the vertical direction can detect the liquid to be detected in the sampling tube. However, the present disclosure is not limited to this. The liquid detection device 1 can also be set near the upper end or middle part of the vertical guide rail extending in the vertical direction as needed, and the sampling tube can also be moved along the vertical guide rail to the lower end or middle part of the vertical guide rail for liquid sampling.

[0048] In another embodiment of the present disclosure, Figure 1 Different from the illustrated embodiment, the guide rail may extend in a substantially horizontal direction. In another embodiment, the guide rail extends substantially in a straight line direction, for example, may extend in a diagonal direction.

[0049] According to an embodiment of the present disclosure, the guide rail has two parts respectively extending along two line segments at a certain angle, or the guide rail forms a closed figure.

[0050] As in Figure 3-4In the embodiment shown, in which the sampling tube can move vertically up and down and horizontally, the guide rail 5 is a closed guide rail of a runway shape, wherein the plane where the closed guide rail is located is substantially perpendicular to the horizontal plane (i.e., the guide rail 5 is a closed guide rail of a runway shape "standing" instead of "laying" on the horizontal plane), and the sampling tube can move around the closed figure. In this embodiment, during the process of liquid sampling and detection, the sampling tube 3 can first be moved along the closed guide rail of a runway shape to the upper left end of the closed guide rail, i.e., A, to sample the liquid. After the liquid sampling is completed, the sampling tube with the liquid to be detected is moved along the closed guide rail to the lower left end of the closed guide rail of a runway shape, i.e., B. At this time, the liquid detection system 1 arranged near the lower left end of the closed guide rail, i.e., B, can detect the liquid to be detected in the sampling tube. After the detection is completed, the sampling tube can be moved to the lower right corner C of the guide rail to discharge the waste liquid into the corresponding waste liquid bucket 10. Finally, the sampling tube is moved to D, and the clean water released by the faucet 11 cleans the sampling tube. However, the present disclosure is not limited thereto, and the liquid detection system 1 can also be arranged near the lower right end of the track-shaped closed guide rail or any other desired place as required, and the sampling tube can also be moved along the track-shaped closed guide rail to the upper right end of the closed guide rail, i.e., D, or any other desired place for liquid sampling. Preferably, the sample sampling location, the Raman spectrometer, the waste liquid discharge location, and the faucet cleaning location are arranged in sequence, so that the moving distance of the sampling tube can be saved.

[0051] In another embodiment of the present disclosure, Figure 6 As shown, the guide rail may not have a closed pattern, for example, may have an L-shaped pattern, or may have a portion extending substantially in the horizontal direction and a portion extending substantially in the vertical direction. In short, the guide rail may have two portions extending along two line segments at a certain angle, respectively, to reciprocate between multiple positions, thereby saving the area of ​​the bracket 2 or saving the distance moved by the user.

[0052] According to an embodiment of the present disclosure, a protrusion 6 (such as Figure 2 As shown in FIG. 1 , the guide rail has a groove that can accommodate and hold the protrusion and extends along the extension direction of the guide rail, wherein the sampling tube base and the guide rail are slidably connected through the protrusion and the groove, that is, the protrusion can slide in the groove of the guide rail. However, the present disclosure is not limited thereto, and other connection methods known in the art may also be used.

[0053] According to an embodiment of the present disclosure, the liquid sampling device further comprises a liquid level detection device 7 for detecting the liquid level in the sampling tube, wherein the liquid level detection device may be a sensor, an optical sensor, a resistance sensor, and the like.

[0054] According to an embodiment of the present disclosure, the liquid sampling device further comprises a liquid level warning device 8 for issuing a warning when the liquid level in the sampling tube reaches a predetermined position.

[0055] According to one embodiment of the present disclosure, the liquid level warning device is a liquid level indicator light and / or a speaker. That is to say, a liquid level indicator light can be set as a liquid level warning device, and when the sampled liquid reaches a predetermined liquid level, a yellow indicator light comes on, and then the operator can stop pouring the liquid in the package. Of course, an alarm such as a speaker can also be used instead of the yellow liquid level indicator light to notify the security operator to stop pouring the liquid. Furthermore, an alarm such as a speaker and a liquid level indicator light can also be used as a liquid level warning device at the same time to better warn when the liquid in the sampling tube reaches a predetermined liquid level.

[0056] Specifically, the specific operation process of the liquid sampling system of the present disclosure can be as follows: when the liquid in the opened opaque package needs to be sampled and tested, the liquid is poured into the sampling tube through the funnel-shaped opening of the sampling tube, and the sampling tube has a liquid level monitoring to control the sampling amount. The sampling tube will be moved manually or automatically to the detection port of the liquid detection system, such as the light outlet of the Raman spectrometer, through a guide rail or other device.

[0057] According to an embodiment of the present disclosure, the liquid sampling device further includes a waste liquid discharge pipe 9, which is arranged at the bottom of the sampling pipe.

[0058] According to an embodiment of the present disclosure, the liquid sampling device further includes a valve (not shown), which is disposed at the bottom of the sampling tube or on a waste liquid discharge tube connected to the sampling tube.

[0059] According to an embodiment of the present disclosure, the valve is an electronic valve.

[0060] According to one embodiment of the present disclosure, the liquid sampling system also includes a position sensor or position encoder (not shown in the figure, wherein the encoder is a device used to measure the rotation angle or speed of the device and to measure the linear horizontal displacement distance, and the position encoder includes various gratings and magnetic encoders for position feedback. The encoder converts angular displacement or linear displacement into an electrical signal, the former is called a code disk, and the latter is called a code scale. According to the readout method, the encoder can be divided into contact and non-contact types; according to the working principle, the encoder can be divided into incremental and absolute types. The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and the number of pulses is used to represent the size of the displacement. Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the starting and ending positions of the measurement, but not to the intermediate process of the measurement), wherein the electronic valve communicates with the position sensor or encoder, and when the sampling tube moves to a predetermined position, the electronic valve automatically opens.

[0061] Specifically, a waste liquid discharge pipe 9 can be provided at the bottom of the sampling tube. When the detection is completed, the valve provided at the bottom of the sampling tube or provided on the waste liquid discharge pipe is opened to recover the liquid to a suitable waste liquid bucket. Of course, the valve can preferably be a sampling electronic valve, and a position sensor or position encoder capable of detecting the position of the liquid level in the sampling tube can also be provided. The electronic valve can communicate with the position sensor / encoder. When the sampling tube moves to the top of the waste liquid bucket provided at a predetermined position, the electronic valve automatically opens to discharge the waste liquid.

[0062] According to one embodiment of the present disclosure, the sampling tube is moved to a predetermined position including: the sampling tube is moved to a predetermined position corresponding to the test result of the liquid (such as moving the sampling tubes with toxic waste liquid, flammable and explosive waste liquid and other waste liquid to the corresponding predetermined positions 1, 2 and 3 respectively, so that different waste liquid treatments can be performed). That is to say, a plurality of waste liquid barrels can be provided for holding different types of waste liquids and the plurality of waste liquid barrels can be provided at a plurality of predetermined positions corresponding to different types of waste liquids ( / test results). After the Raman spectrometer completes the spectral detection, the electronic valve can also communicate with the Raman spectrometer to obtain the test result of the liquid, so as to move the sampling tube to a waste liquid barrel of a suitable type corresponding to the test result and discharge the waste liquid. This can avoid the situation where all waste liquids are recycled into one waste liquid barrel and different liquids undergo chemical reactions, resulting in danger. In addition, different types of waste liquids can also be treated differently.

[0063] According to one embodiment of the present disclosure, the liquid sampling system further includes a faucet 11 (such as Figure 3-4 , 6), used to clean the sampling tube after the test is completed or after the waste liquid is discharged.

[0064] like Figure 3 As shown, a cleaning faucet can be provided on the bracket (or other positions). When the sampling tube moves to position A along with the sampling tube base, a small portion of the liquid in the package of the sample to be tested can be poured into the sampling tube, and the pouring is stopped when the indicator light comes on or the alarm sounds; then, the sampling tube is moved to position B manually or automatically, and when the tube wall of the sampling tube is located in front of the detection head of the Raman spectrometer, the Raman detection is started; after the Raman detection is completed, the sampling tube is moved to position C manually or automatically, and the (electronic) valve at the bottom of the sampling tube is opened to allow the waste liquid to flow into the waste liquid bucket. When the waste liquid is drained, the faucet is opened, and the cleaning water flows to the funnel to clean the remaining sample liquid. The cleaned water can also flow into the waste liquid bucket. However, the present disclosure is not limited to this, and the cleaned water can also flow into the bucket 12 provided under the faucet, such as Figure 6 shown.

[0065] According to an embodiment of the present disclosure, the faucet is an electronically controlled faucet.

[0066] According to one embodiment of the present disclosure, the liquid sampling system also includes a controller (not shown) for controlling the automatic operation of the entire liquid sampling system, and can communicate with the liquid level detection device and the position sensor / position encoder to control the liquid level warning device to warn and the movement of the sampling tube along the guide rail. The controller can also control the switching of the electronic valve and / or the switching of the faucet.

[0067] Specifically, the faucet can be replaced with an electronically controlled faucet, and a controller can be set on the sampling tube or bracket. The pulley or sprocket drive system, position sensor / encoder, Raman spectrometer, electronic valve at the bottom of the sampling tube, and electric faucet can all communicate with the controller. The controller controls the automatic operation of the entire liquid sampling system, which can greatly save labor and reduce the difficulty of professional training for people.

[0068] According to an embodiment of the present disclosure, the movement along the guide rail is driven by a motor or performed manually.

[0069] According to an embodiment of the present disclosure, the movement of the sampling tube along the guide rail, the opening and closing of the valve and / or the opening and closing of the faucet are manually controlled, and the sampling tube base is equipped with a locking mechanism.

[0070] According to an embodiment of the present disclosure, the movement along the guide rail is performed by a lead screw, a push rod, a pulley or a sprocket.

[0071] Specifically, in the example where the sampling tube moves vertically up and down (e.g. Figure 1-2 As shown in the figure, the motor can drive the lead screw or the push rod to drive the sampling tube to move up and down; of course, the sampling tube can also be moved vertically up and down by manually rotating the threaded push rod. Figure 1 These mechanisms are not shown in detail.

[0072] On the other hand, in the example where the sampling tube can move both vertically and horizontally, or the sampling tube can move around a closed figure (such as Figure 3-4 As shown in the figure, the sampling tube can be driven to perform reciprocating motion along a closed path or a part of a closed path by a mechanical transmission mechanism (not shown) such as a pulley or a sprocket, thereby realizing the movement of the sampling tube in both the up and down and horizontal directions.

[0073] Through the above detailed description, those skilled in the art can easily understand that the liquid sampling device according to the embodiment of the present disclosure has one or more of the following advantages.

[0074] According to some embodiments of the present disclosure, the liquid to be tested can be sampled quickly and conveniently without causing the liquid to overflow and come into contact with the skin.

[0075] According to some embodiments of the present disclosure, the entire liquid sampling system can be controlled to run automatically in a fully automatic manner, saving manpower and professional requirements for personnel.

[0076] According to some embodiments of the present disclosure, liquids with different characteristics can be poured into different waste liquid barrels according to the detection results to reduce the risk, or a single waste liquid barrel can be used for treatment without distinguishing the types of waste liquids.

[0077] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0078] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A liquid sampling system for a liquid detection device, comprising: bracket; A sampling tube, wherein the cross-sectional area of ​​the opening of the sampling tube is larger than the cross-sectional area of ​​the main body of the sampling tube; A sampling tube base, on which the sampling tube is arranged; A guide rail is provided on the bracket, and the sampling tube base is slidably connected to the guide rail, so that the sampling tube and the sampling tube base can move along the guide rail; Wherein, the sampling tube base is only arranged on the lower cylindrical main body of the sampling tube; the side surface of the sampling tube base is in a curved shape; The liquid sampling system further comprises: a position sensor or a position encoder for detecting the position of the sampling tube; The liquid sampling system also includes: a liquid level detection device, a liquid level warning device, and a controller. Wherein, the liquid level detection device is used to detect the liquid level height in the sampling tube; the liquid level warning device is used to warn when the liquid level detected by the liquid level detection device reaches a predetermined liquid level position; The liquid sampling system is used to sample liquid in an opaque package; The controller can communicate with the liquid level detection device and the position sensor / position encoder to control the liquid level warning device to warn and the movement of the sampling tube along the guide rail; Among them, the sample sampling position, liquid detection position, waste liquid discharge position and faucet cleaning position are arranged in sequence on the guide rail.

2. The liquid sampling system according to claim 1, characterized in that: The sampling tube base is provided with a protrusion, and the guide rail has a groove which can accommodate the protrusion and extends along the extension direction of the guide rail, wherein the sampling tube base and the guide rail are slidably connected through the combination of the protrusion and the groove.

3. The liquid sampling system according to claim 1, characterized in that: The guide rail extends substantially in a straight direction.

4. The liquid sampling system according to claim 1, characterized in that: The guide rail has two parts extending along two line segments respectively forming a certain angle, or the guide rail forms a closed figure.

5. The liquid sampling system for a liquid detection system as described in claim 1, further comprising a waste liquid bucket for collecting waste liquid discharged from the sampling tube.

6. The liquid sampling system for a liquid detection system according to claim 5, wherein: There are multiple waste liquid barrels, each of which is used to hold waste liquid corresponding to the type of sample detected by the liquid detection device.

7. The liquid sampling system as described in claim 1 or 6, further comprising a valve, which is arranged at the bottom of the sampling tube, or is arranged on a waste liquid discharge pipe connected to the sampling tube.

8. The liquid sampling system as claimed in claim 7, wherein the valve is an electronic valve, which can communicate directly or indirectly with a position sensor or an encoder, and when the sampling tube moves to a predetermined position, the electronic valve opens.

9. The liquid sampling system as claimed in claim 1, further comprising a faucet for cleaning the sampling tube after the detection is completed or after the waste liquid is discharged.

10. The liquid sampling system according to any one of claims 1 to 9, wherein the controller can also control the opening and closing of the electronic valve and / or the opening and closing of the faucet.

11. The liquid sampling system according to any one of claims 1 to 5, wherein the movement of the sampling tube along the guide rail, the opening and closing of the valve and / or the opening and closing of the faucet are manually controlled, and the sampling tube base is provided with a locking mechanism.

12. The liquid sampling system of claim 1, wherein: The liquid detection equipment is a Raman spectrometer.

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