A continuous detection device for aniline compounds in water

Abstract

The present invention provides a continuous detection device for aniline compounds in water, comprising an air chamber and an extraction tube. During an extraction operation, the negative pressure in the air chamber causes a liquid sample in the extraction tube to flow into a collection tube after passing through an adsorbent, and the liquid level of the liquid sample in the extraction tube gradually decreases, causing a sealing disk to gradually switch from an open state to a closed state, and the internal space of the extraction tube to gradually switch from a non-sealed state to a sealed state, thereby preventing dust particles in the air from entering the extraction tube, causing some dust particles and target objects to coexist on the adsorbent, thereby ensuring the purity of the target object during elution and collection; sealing the extraction tube can also prevent the liquid sample in the extraction tube from flowing out due to operational errors and other reasons, thereby preventing air from entering the adsorbent layer to form air embolism and affecting the solid-phase extraction process.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, in particular to a continuous detection device for aniline compounds in water. Background Art

[0002] Currently, to improve detection sensitivity and avoid false negatives or signal distortion, solid-phase extraction (SPE) combined with liquid chromatography-tandem mass spectrometry (LC-MS / MS) is commonly used to determine aniline compounds in water. SPE, a type of chromatographic separation technique, primarily purifies the target based on the affinity between the target and the adsorbent. This process generally involves pretreatment of the SPE column; sample loading; washing away interfering substances; and elution and collection of the target. Pretreatment of the SPE column removes impurities that may be present in the adsorbent, thereby reducing their interference with the purification process. Washing away interfering substances removes minor matrix-interfering components adsorbed on the SPE column, further improving the purity of the target.

[0003] To facilitate adsorbent addition and elution, existing solid-phase extraction (SPE) tubes are typically open-topped. While this is convenient, it can easily allow dust particles from the air to enter the tube during operation. These dust particles are complex in composition, and some have an affinity for the adsorbent, causing them to coexist with the target compound on the adsorbent, resulting in a decrease in the purity of the target compound during elution and collection. Furthermore, most current extraction devices use negative pressure as the power source for liquid flow. Any operational error can easily cause the solution in the extraction tube to drain completely, allowing air to enter the adsorbent layer, forming an air embolism and affecting the SPE process.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] Based on this, it is necessary to provide a continuous detection device for aniline compounds in water to address the problems existing in the current solid phase extraction tube.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A continuous detection device for aniline compounds in water, comprising an air chamber and an extraction tube, wherein a collecting tube is provided inside the air chamber, the extraction tube is provided outside the air chamber and is communicated with the interior thereof, and an adsorbent is provided inside the extraction tube;

[0008] When negative pressure is formed in the air chamber, the liquid sample in the extraction tube flows into the collection tube after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube drops from a first position to a second position before and after the flow; a sealing disk is provided in the extraction tube, and when in the first position, the sealing disk is open, and the interior of the extraction tube is connected to the external environment; when in the second position, the sealing disk is closed to seal the interior of the extraction tube.

[0009] Furthermore, the sealing disk is rotatably disposed in the extraction tube, and when the sealing disk is open, the plane where the sealing disk is located forms an angle with the horizontal plane, and when the sealing disk is closed, the plane where the sealing disk is located coincides with the horizontal plane.

[0010] Furthermore, a first floating member and a second floating member are respectively provided on both sides of the sealing disk, and the first floating member and the second floating member are centrally symmetrical about the rotating axis of the sealing disk;

[0011] When the liquid level of the liquid sample in the extraction tube starts to decrease from the first position, a buoyancy difference is generated between the first floating member and the second floating member, causing the sealing disk to rotate.

[0012] Furthermore, both the first floating member and the second floating member have a flow-disturbing structure.

[0013] Furthermore, the diameter of the sealing disk is smaller than the inner diameter of the extraction tube, and an airbag is provided on the outer circumference of the sealing disk. When the sealing disk is opened, the airbag contracts, and when the sealing disk is closed, the airbag expands and abuts against the inner wall of the extraction tube.

[0014] Furthermore, the sealing disk has a chamber connected to the airbag, and a piston rod is provided on the sealing disk. The piston rod can enter and exit the chamber to change the pressure in the chamber.

[0015] Furthermore, the airbag is connected to an external air source through an air tube.

[0016] Furthermore, when the sealing disk rotates from open to closed, the piston rod can rotate synchronously and move along the rotation axis direction of the sealing disk.

[0017] Furthermore, a locking mechanism is provided between the sealing disk and the extraction tube, and the sealing disk is kept open or closed by the locking mechanism; when the liquid level of the liquid sample in the extraction tube begins to decrease from the first position, the sealing disk can overcome the action of the locking mechanism and rotate from open to closed.

[0018] Furthermore, the locking mechanism includes a pin and a slot. When the pin is in the slot, the sealing disk remains open or closed. When a buoyancy difference is generated between the first floating part and the second floating part, the pin slides from one slot into the other slot, and the sealing disk rotates from open to closed.

[0019] The beneficial effects of the present invention are as follows: during the extraction operation, the negative pressure in the air chamber causes the liquid sample in the extraction tube to flow into the collection tube after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube gradually decreases, causing the sealing disk to gradually switch from open to closed, and the internal space of the extraction tube to gradually switch from a non-sealed state to a sealed state, thereby preventing dust particles in the air from entering the extraction tube, causing some dust particles and target objects to exist on the adsorbent at the same time, thereby ensuring the purity of the target object during elution and collection; in addition, sealing the extraction tube can also prevent the liquid sample in the extraction tube from flowing out due to operational errors and other reasons, thereby preventing air from entering the adsorbent layer to form air embolism, affecting the solid-phase extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a continuous detection device for aniline compounds in water provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 for Figure 1 A side view of a continuous detection device for aniline compounds in reclaimed water;

[0023] Figure 4 for Figure 3 A cross-sectional view of the continuous detection device for aniline compounds in recycled water taken along line BB;

[0024] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0025] Figure 6 This is an exploded view of the parts of the extraction tube in the continuous detection device for aniline compounds in water;

[0026] Figure 7 This is an exploded view of the sealing disk parts in the continuous detection device for aniline compounds in water;

[0027] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0028] Figure 9 It is a side view of the column head tube in the continuous detection device of aniline compounds in water;

[0029] Figure 10 for Figure 9 A cross-sectional view of the column head tube in the EE direction of the continuous detection device for aniline compounds in recycled water;

[0030] Figure 11 for Figure 10 A cross-sectional view of the column head tube in the continuous detection device for aniline compounds in recycled water along the FF direction;

[0031] Figure 12 for Figure 11 A partial enlarged view of point G in the middle;

[0032] Figure 13 for Figure 12 Structural deformation diagram.

[0033] in:

[0034] 100, gas chamber; 101, extraction tube; 102, collection tube; 103, vacuum gauge; 104, base; 105, sealing cover; 106, flow control valve; 107, column head tube; 108, stuffing tube; 109, lower partition; 110, upper partition; 111, flow guide tube;

[0035] 200, sealing disc; 201, first floating member; 202, second floating member; 203, flow-disturbing structure; 204, airbag; 205, chamber; 206, piston rod; 207, inner tube; 208, outer tube; 209, spiral chute; 210, protrusion;

[0036] 300, locking mechanism; 301, latch; 302, slot; 303, ring body; 304, compression spring; 305, connecting arc surface; 306, inclined surface. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] like Figures 1 to 13 As shown, an embodiment of the present invention provides a continuous detection device for aniline compounds in water, comprising an air chamber 100 and an extraction tube 101. A collecting tube 102 is provided inside the air chamber 100, an extraction tube 101 communicating with the interior of the air chamber 100 is provided outside the air chamber 100, and an adsorbent is provided inside the extraction tube 101.

[0041] When negative pressure is formed in the gas chamber 100, the liquid sample in the extraction tube 101 flows into the collection tube 102 after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube 101 drops from a first position to a second position before and after the flow. A sealing disk 200 is provided in the extraction tube 101. When in the first position, the sealing disk 200 is open, and the interior of the extraction tube 101 is connected to the external environment. When in the second position, the sealing disk 200 is closed to seal the interior of the extraction tube 101.

[0042] During the extraction operation, the negative pressure in the gas chamber 100 causes the liquid sample in the extraction tube 101 to flow into the collection tube 102 after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube 101 gradually decreases, causing the sealing disk 200 to gradually switch from open to closed, and the liquid sample in the corresponding extraction tube 101 gradually switches from a non-sealed state to a sealed state, thereby preventing dust particles in the air from entering the extraction tube 101, causing some dust particles and the target object to exist on the adsorbent at the same time, thereby ensuring the purity of the target object during elution and collection; in addition, sealing the extraction tube 101 can also prevent the liquid sample in the extraction tube 101 from flowing out due to operational errors and other reasons, thereby preventing air from entering the adsorbent layer to form air embolism, affecting the solid phase extraction process.

[0043] It is worth noting that by sealing the extraction tube 101 , it is also possible to avoid the phenomenon of the adsorbent being inactivated by prolonged contact with air after the solid phase extraction is completed, for example, the silica gel matrix is ​​easily affected by humidity.

[0044] The liquid sample is a water sample containing aniline compounds; the adsorbent can be a reverse-phase adsorbent, a cation exchange adsorbent, or a mixed adsorbent. Furthermore, this detection device focuses on improving the sealing of the extraction tube 101 during the sample loading process. Other solid-phase extraction processes, such as pretreatment, washing away interfering substances, and eluting and collecting the target, are all existing techniques and will not be detailed here.

[0045] The first position is the liquid level of the liquid sample in the extraction tube 101 after the liquid sample is added into the extraction tube 101 ; the second position is the liquid level of the liquid sample in the extraction tube 101 after the solid phase extraction physical and chemical process has been carried out for a period of time.

[0046] Among them, see Figures 1 to 4 The gas chamber 100 is equipped with a vacuum gauge 103 and is connected to a negative pressure pump through a pipeline to form a negative pressure environment inside the gas chamber 100; the collection tube 102 is set in the gas chamber 100 through a test tube rack; a base 104 is provided on the lower side of the gas chamber 100, and a sealed upper cover 105 is provided on the upper side. The sealed upper cover 105 is detachably provided with multiple guide tubes 111 through threads. The lower end of the guide tube 111 is connected to the interior of the gas chamber 100 and is placed above the collection tube 102. The upper end of the guide tube 111 is correspondingly connected to the lower end of the extraction tube 101, so that the lower end of the extraction tube 101 is connected to the interior of the gas chamber 100; the guide tube 111 is equipped with a flow regulating valve 106.

[0047] Among them, see Figure 5 、 Figure 6The extraction tube 101 includes a column tube 107 and a filling tube 108, which are arranged above and below and are detachably connected by threads and are sealed with a sealing ring. The lower end of the filling tube 108 is tapered and has an insertion portion that can be plugged into the guide tube 111. A lower partition 109 is provided in the filling tube 108 for placing the adsorbent. The filling tube 108 also has a removable upper partition 110 to facilitate the replacement of the adsorbent. The upper partition 110 and the lower partition 109 both have a mesh structure to facilitate the upper and lower communication of the extraction tube 101, thereby allowing the liquid sample to pass through. In addition, the overall length of the extraction tube 101 can be adjusted by the threads at the connection between the column tube 107 and the filling tube 108, thereby adapting to the solid-phase extraction process of liquid samples of different volumes.

[0048] Preferably, see Figure 5 、 Figure 6 The sealing disk 200 is rotatably disposed in the extraction tube 101. When the sealing disk 200 is opened, the plane where the sealing disk 200 is located forms an angle with the horizontal plane. When the sealing disk 200 is closed, the plane where the sealing disk 200 is located coincides with the horizontal plane.

[0049] Compared with manually inserting the sealing plug, the interior of the extraction tube 101 is gradually switched from an unsealed state to a sealed state by rotating the sealing disk 200. The two sides of the sealing disk 200 move up and down relative to each other, which can avoid impact on the adsorbent and prevent the target adsorbed on the adsorbent from being washed away, thereby ensuring the yield of the target.

[0050] When the sealing disk 200 is open, the angle formed between the plane where the sealing disk 200 is located and the horizontal plane ranges from 30° to 90°, for example, 30°, 45°, or 60°. The angle is preferably 90°, meaning that the plane where the sealing disk 200 is located is vertical. In this case, the extraction tube 101 has a larger liquid inlet, making it easier to add the liquid sample into the extraction tube 101.

[0051] Of course, other structures can also be used to switch the interior of extraction tube 101 from an unsealed state to a sealed state. For example, a structure similar to that used to drive the aperture of a camera to expand and contract can be used. Specifically, sealing disk 200 includes multiple circumferentially arranged blades, all of which can synchronously contract or expand toward the center to change the size of the central through-hole formed by the blades. When the liquid sample level is at a first position, the through-hole is at its largest, i.e., sealing disk 200 is open, and extraction tube 101 is in an unsealed state. As the liquid sample level decreases, the through-hole gradually decreases, i.e., sealing disk 200 gradually shrinks until it closes, and extraction tube 101 is in a sealed state.

[0052] For another example, the sealing disk 200 can be positioned horizontally within the extraction tube 101, and a telescopic structure such as an air cylinder or oil cylinder can be used to drive the sealing disk 200 to move radially. A sliding hole is provided in the sidewall of the extraction tube 101 to allow the sealing disk 200 to enter and exit, and a corresponding movable sealing structure is provided. When the liquid sample level is at a first position, the sealing disk 200 is positioned outside the extraction tube 101, i.e., the two are eccentric, and the extraction tube 101 is in an unsealed state. As the liquid sample level gradually decreases, the sealing disk 200 moves in a direction concentric with the extraction tube 101 until the two are concentric, and the extraction tube 101 is now sealed.

[0053] Preferably, see Figure 6 、 Figure 7 , a first floating member 201 and a second floating member 202 are respectively provided on both sides of the sealing disk 200, and the first floating member 201 and the second floating member 202 are centrally symmetrical about the rotating axis of the sealing disk 200;

[0054] When the liquid level of the liquid sample in the extraction tube 101 begins to decrease from the first position, a buoyancy difference is generated between the first floating member 201 and the second floating member 202 , causing the sealing disk 200 to rotate.

[0055] The first floating member 201 and the second floating member 202 are centrally symmetrically arranged on the sealing disk 200. When a buoyancy difference is generated between the first floating member 201 and the second floating member 202, the sealing disk 200 generates a corresponding rotational torque, thereby realizing the rotation of the sealing disk 200.

[0056] It is worth noting that within the extraction tube 101, due to its small size, the tension exerted by the liquid sample on the sealing disk 200 can be considered. When the sealing disk 200 is vertical, the tension on the sealing disk 200 is balanced. However, when the sealing disk 200 is nearly horizontal, the tension acts as a suction force on the sealing disk 200, which has the same effect as the rotational torque generated by the buoyancy difference, i.e., both tend to rotate the sealing disk 200 toward the horizontal direction.

[0057] The first and second floating members 201 and 202 have identical structures and volumes, and both have hollow cavities, which ensure they experience equal buoyancy in the liquid sample within the extraction tube 101. Their shapes can be spherical or plate-like, without limitation. Furthermore, equal numbers of the first and second floating members 201 and 202 can be provided. Alternatively, the volume of the hollow cavities can be increased while reducing the thickness of the floating members, or the volume of the floating members can be increased. These factors can increase the buoyancy they experience, facilitating the rotation of the sealing disk 200.

[0058] When the sealing disk 200 is open, that is, held vertically, the first float 201 is higher than the second float 202. At this point, the first position is higher than the highest point of the first float 201, and the buoyancy difference between the first and second floats is zero. When the liquid sample level drops to a point where the first float 201 is completely above the liquid surface and the second float 202 is completely below the liquid surface, the buoyancy difference between the first and second floats 201, 202 is maximum. As the liquid sample level continues to drop, the buoyancy difference between the first and second floats 201, 202 gradually decreases until both are above the liquid surface. In other words, the buoyancy difference between the first and second floats 201, 202 increases from zero to a maximum, then decreases to zero. Before the buoyancy difference between the first and second floats decreases to zero, the sealing disk 200 has already rotated to close.

[0059] Of course, other structures can also be configured to rotate the sealing disk 200. For example, a liquid level sensor can be provided within the extraction tube 101 to detect the liquid sample level. The sealing disk 200 can also be provided with a rotation drive mechanism, such as a motor, and connected to a power supply and a control module. When the liquid level is at a first position, the control module controls the sealing disk 200 to remain vertical and stationary. As the liquid level gradually descends to a second position, the control module obtains the liquid sample level detected by the liquid level sensor and controls the rotation drive mechanism to rotate the sealing disk 200, gradually reducing the angle between the plane of the sealing disk 200 and the horizontal plane until the plane of the sealing disk 200 coincides with the horizontal plane, and the sealing disk 200 seals the extraction tube 101.

[0060] Preferably, see Figure 7 Both the first floating element 201 and the second floating element 202 have a flow-disturbing structure 203 .

[0061] Among them, the spoiler structure 203 can be a wavy surface. For example, the first floating member 201 and the second floating member 202 are both plate-like structures, that is, floating plates. The floating plates are vertically arranged and perpendicular to the sealing disk 200. The floating plates are perpendicular to the sealing disk 200 and are provided with wavy surfaces on both sides. When the liquid sample is added to the extraction tube 101, the liquid sample will generate certain pressure and flow rate changes when flowing downward and passing through the floating plates, thereby being able to break the bubbles carried in the liquid sample and reduce the impact on the adsorbent layer.

[0062] Of course, the flow-disrupting structure 203 can also be other structures, such as a conical disperser. Specifically, the first floating member 201 and the second floating member 202 are both semi-conical, with a narrow top and a wide bottom. Therefore, both have tapered surfaces. As the liquid sample passes through the gradually widening conical surface, the flow velocity decreases, the flow tends to be laminar, and the entrapment of bubbles is reduced. The cone angle of the semi-cone is 30° to 60° to prevent flow separation; guiding ribs can be added to the conical surface to further stabilize the flow.

[0063] Preferably, see Figure 6 、 Figure 7 The diameter of the sealing disk 200 is smaller than the inner diameter of the extraction tube 101. An airbag 204 is provided on the outer circumference of the sealing disk 200. When the sealing disk 200 is opened, the airbag 204 contracts. When the sealing disk 200 is closed, the airbag 204 expands and abuts against the inner wall of the extraction tube 101.

[0064] When the airbag 204 expands and contacts the inner wall of the extraction tube 101, it cooperates with the sealing disk 200 to achieve a better sealing effect on the extraction tube 101. Furthermore, as the liquid sample level drops and the sealing disk 200 gradually rotates to a horizontal position, the airbag 204 gradually expands from contraction. Compared to a permanently inflated airbag 204, this reduces wear between the airbag 204 and the extraction tube 101, thereby extending its service life.

[0065] The airbag 204 is annular and fits against the outer circumference of the sealing disk 200 .

[0066] Preferably, see Figure 6 、 Figure 7 、 Figure 10 The sealing disk 200 has a chamber 205 connected to the airbag 204 . A piston rod 206 is provided on the sealing disk 200 . The piston rod 206 can enter and exit the chamber 205 to change the pressure in the chamber 205 .

[0067] Since the space inside the chamber 205 and the airbag 204 is constant, when the sealing disk 200 rotates from open to closed, the piston rod 206 gradually extends into the chamber 205, squeezing and occupying the space inside the chamber 205 and the airbag 204, causing the pressure in the chamber 205 to gradually increase, thereby causing the airbag 204 to gradually expand.

[0068] Among them, the sealing disk 200 is composed of two thin disks concentrically spaced to form a chamber 205 inside, and an annular airbag 204 is fitted at the space. Optionally, the inner side of the airbag 204 is open and fixed to the sealing disk 200, and the outer side is a retractable structure for expansion and contraction.

[0069] As a structural variation of the present invention, the airbag 204 is connected to an external air source via an air tube, and the expansion and contraction of the airbag 204 is controlled by a controller.

[0070] Preferably, when the sealing disk 200 rotates from open to closed, the piston rod 206 can rotate synchronously and move along the rotation axis direction of the sealing disk 200 .

[0071] Among them, see Figure 7 、 Figure 8 、 Figure 10An inner tube 207 is fixed on the sealing disk 200 along its horizontal radial direction. The inner sides of the two inner tubes 207 are inserted into the chamber 205 and communicate with the chamber 205. A piston rod 206 is slidably provided in the inner tube 207. The piston rod 206 and the inner tube 207 are slidably matched through splines and spline grooves and can rotate synchronously; an outer tube 208 is provided on the extraction tube 101, and a spiral groove 209 is opened on the inner wall of the outer tube 208. The piston rod 206 is provided with a protrusion 210 that slides correspondingly with the spiral groove 209. When the sealing disk 200 and the inner tube 207 rotate from open to closed, the piston rod 206 is driven to rotate synchronously through the cooperation of the spline and the spline groove, and the protrusion 210 slides along the spiral groove 209, so that the piston rod 206 moves along the inner tube 207 toward the center of the sealing disk 200, that is, moves into the chamber 205, so that the pressure in the chamber 205 gradually increases, thereby causing the airbag 204 to gradually expand.

[0072] When the piston rod 206 moves to its maximum position within the chamber 205, the airbag 204 expands to ensure a seal. At this point, the outer side of the piston rod 206 protrudes beyond the outer tube 208. The piston rod 206 can be manually rotated or pulled to move it out of the chamber 205, causing the airbag 204 to contract and the sealing disk 200 to rotate, thereby releasing the seal. Alternatively, the sealing disk 200 can be directly pressed to rotate it, which can also release the seal.

[0073] Optionally, the spiral chute 209 may include two sections, for example, a first section farther from the sealing disk 200 and a second section closer to the sealing disk 200. The pitch of the first section is smaller than the pitch of the second section, and the central angle or number of turns corresponding to the first section is larger than the central angle or number of turns corresponding to the second section. Of course, the pitch, central angle, or number of turns corresponding to the first and second sections can transition smoothly, i.e., change linearly. This allows the airbag 204 to expand a small amount first and then a large amount, for the same rotation speed of the sealing disk 200, further reducing wear between the airbag 204 and the extraction tube 101 and extending its service life. For example, if the sealing disk 200 rotates from vertical to horizontal, i.e., 90°, and the sealing disk 200 rotates 70°, the airbag 204 first expands 30%. When the sealing disk 200 rotates to 90°, the airbag 204 is fully expanded.

[0074] Of course, the piston rod 206 can be the output end of a structure such as a cylinder or a hydraulic rod. The piston rod 206 is slidably disposed on the sealing disk 200 and can be contracted relative to the chamber 205 to generate pressure changes in the chamber 205 .

[0075] Preferably, a locking mechanism 300 is provided between the sealing disk 200 and the extraction tube 101. The sealing disk 200 is kept open or closed by the locking mechanism 300, so that the sealing disk 200 can remain stable when in the open or closed state; when the liquid level of the liquid sample in the extraction tube 101 starts to decrease from the first position, the sealing disk 200 can overcome the action of the locking mechanism 300 and rotate from open to closed.

[0076] Preferably, the locking mechanism 300 includes a pin 301 and a slot 302. When the pin 301 is in the slot 302, the sealing disk 200 remains open or closed. When a buoyancy difference is generated between the first floating member 201 and the second floating member 202, the pin 301 slides from one slot 302 into the other slot 302, and the sealing disk 200 rotates from open to closed.

[0077] The latch 301 can be disposed on the sealing disk 200 or the extraction tube 101 , and the two latch slots 302 are correspondingly disposed on the extraction tube 101 or the sealing disk 200 .

[0078] Among them, see Figure 8 as well as Figures 10 to 12 The inner tube 207 is sleeved with a ring body 303, and a radial groove is formed on the ring body 303. A pin 301 that slides along the radial groove is installed in the radial groove through a compression spring 304, that is, the pin 301 is set on the sealing disk 200 at this time; two slots 302 are formed on the inner wall of the outer tube 208, that is, the two slots 302 are correspondingly set on the extraction tube 101 at this time, and the two slots 302 are respectively located at the first slot 302 on the lower side of the outer tube 208 and the second slot 302 on the right side. A connecting arc surface 305 is provided on the side where the first slot 302 and the second slot 302 are close to each other. The connecting arc surface 305 gradually moves away from the center of the outer tube 208 from the first slot 302 to the second slot 302, and an inclined surface 306 is provided at the connection between the first slot 302 and the connecting arc surface 305. When the sealing disk 200 is in the vertically open position, a buoyancy difference is generated between the first and second floating members 201, 202. The corresponding rotational torque generated by the sealing disk 200 drives the inner tube 207, the ring body 303, and the latch 301 to rotate relative to the outer tube 208. The latch 301 overcomes the elastic force of the compression spring 304 and slides along the inclined surface 306 from the first latching groove 302 to the connecting arc surface 305, and then to the second latching groove 302. The sealing disk 200 is now in the horizontally closed position. Optionally, two sets of radial grooves, latches 301, and latching grooves 302 are provided at equal intervals around the circumference of the outer tube 208.

[0079] It is worth noting that the buoyancy difference between the first and second floats 201, 202 generates a corresponding rotational torque for the sealing disk 200. During the process of rotating the sealing disk 200 from vertical to horizontal, this rotational torque is always greater than the sum of the following resistances: the elastic force of the compression spring 304; the friction force when the latch 301 moves along the first slot 302, the connecting arc 305, and the second slot 302; the friction force when the piston rod 206 slides along the inner tube 207; the reaction force of the pressure in the chamber 205 when the piston rod 206 slides along the inner tube 207; and the friction force when the protrusion 210 slides along the spiral groove 209. To reduce the resistance to the rotational torque, a smooth coating can be provided at the friction-generating areas to reduce friction and facilitate the rotation of the sealing disk 200.

[0080] As another optional structural variation, see Figure 13 Two latch pins 301 are provided, and four latch slots 302 are evenly spaced on the inner wall of the outer tube 208. Both sides of the latch slots 302 are connected to the inner wall of the outer tube 208, and the connection points are all inclined surfaces 306, so that the latch pins 301 can slide from the latch slots 302 to the inner wall of the outer tube 208, and then slide into the adjacent latch slots 302. With this arrangement, the rotational torque generated by the buoyancy difference can cause the sealing disk 200 to rotate counterclockwise or clockwise, which is also convenient for operation when releasing the seal state and facilitates processing and production.

[0081] The present invention adds a water body liquid sample containing aniline compounds into the extraction tube 101 to perform an extraction operation. A negative pressure pump is used to form a negative pressure in the air chamber 100, so that the liquid sample in the extraction tube 101 flows into the collection tube 102 after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube 101 gradually decreases. Since the first floating member 201 and the second floating member 202 are centrally symmetrically arranged on the sealing disk 200, when a buoyancy difference is generated between the two, the sealing disk 200 generates a corresponding rotational torque and rotates from a vertical state to a horizontal state. During this process, the sealing disk 200 drives the piston rod 206 to rotate synchronously, and at the same time, the protrusion 210 slides along the spiral groove 209, so that the piston rod 206 moves along the inner tube 207 toward the center of the sealing disk 200, that is, moves into the chamber 205, so that the pressure in the chamber 205 is reduced. The force gradually increases, thereby causing the airbag 204 to gradually expand until the sealing disk 200 rotates to a horizontal position. The airbag 204 expands and abuts against the inner wall of the extraction tube 101, and cooperates with the sealing disk 200 to seal the liquid sample in the extraction tube 101, thereby preventing dust particles in the air from entering the extraction tube 101, causing some dust particles and target objects to exist on the adsorbent at the same time, thereby ensuring the purity of the target object during elution and collection; in addition, sealing the extraction tube 101 can prevent the liquid sample in the extraction tube 101 from continuing to flow downward, thereby preventing the liquid sample in the extraction tube 101 from flowing out due to operational errors and other reasons, thereby preventing air from entering the adsorbent layer to form air embolism, affecting the solid phase extraction process.

[0082] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A continuous detection device for aniline compounds in water, characterized in that: It comprises an air chamber and an extraction tube, wherein the air chamber is provided with a collecting tube, the air chamber is provided with the extraction tube communicated with the interior thereof, and the extraction tube is provided with an adsorbent; When negative pressure is formed in the air chamber, the liquid sample in the extraction tube flows into the collection tube after passing through the adsorbent, and the liquid level of the liquid sample in the extraction tube drops from a first position to a second position before and after the flow; a sealing disk is provided in the extraction tube, and when in the first position, the sealing disk is open, and the interior of the extraction tube is connected to the external environment; when in the second position, the sealing disk is closed to seal the interior of the extraction tube; the sealing disk is rotatably arranged in the extraction tube, and when the sealing disk is open, the plane on which the sealing disk is located forms an angle with the horizontal plane, and when the sealing disk is closed, the plane on which the sealing disk is located coincides with the horizontal plane; a first floating member and a second floating member are respectively provided on both sides of the sealing disk, and the first floating member and the second floating member are centrally symmetrical about the rotation axis of the sealing disk; when the sealing disk is open, the first floating member is higher than the second floating member, and when the liquid level of the liquid sample in the extraction tube starts to drop from the first position, a buoyancy difference is generated between the first floating member and the second floating member, causing the sealing disk to rotate; the first floating member and the second floating member both have a turbulent structure.

2. The continuous detection device for aniline compounds in water according to claim 1, characterized in that: The diameter of the sealing disk is smaller than the inner diameter of the extraction tube. An airbag is provided on the outer circumference of the sealing disk. When the sealing disk is opened, the airbag contracts. When the sealing disk is closed, the airbag expands and abuts against the inner wall of the extraction tube.

3. The continuous detection device for aniline compounds in water according to claim 2, characterized in that: The sealing disk has a chamber communicated with the airbag. A piston rod is provided on the sealing disk. The piston rod can enter and exit the chamber to change the pressure in the chamber.

4. The continuous detection device for aniline compounds in water according to claim 2, characterized in that: The air bag is connected to an external air source through an air tube.

5. The continuous detection device for aniline compounds in water according to claim 3, characterized in that: When the sealing disk rotates from open to closed, the piston rod can rotate synchronously and move along the rotation axis direction of the sealing disk.

6. The continuous detection device for aniline compounds in water according to claim 1, characterized in that: A locking mechanism is provided between the sealing disk and the extraction tube, and the sealing disk is kept open or closed by the locking mechanism; when the liquid level of the liquid sample in the extraction tube begins to decrease from the first position, the sealing disk can overcome the action of the locking mechanism and rotate from open to closed.

7. The continuous detection device for aniline compounds in water according to claim 6, characterized in that: The locking mechanism includes a pin and a slot. When the pin is in the slot, the sealing disk remains open or closed. When a buoyancy difference is generated between the first floating member and the second floating member, the pin slides from one slot into the other slot, and the sealing disk rotates from open to closed.

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