Solid-phase extraction device for domestic sewage

Abstract

The utility model relates to the technical field of solid-phase extraction devices, in particular to a domestic sewage solid-phase extraction device which comprises a connecting box, a sealing cover is clamped at the top end of the connecting box, an extraction structure is arranged on the sealing cover, the extraction structure comprises switch valves and an extraction column, the two switch valves are installed on the sealing cover, and the extraction column is clamped at the top ends of the switch valves. The bottom end of the switch valve is rotationally connected with a flow guide pipe, the sealing cover is rotationally connected with a connecting shaft, the bottom end of the connecting shaft is fixedly connected with a synchronous wheel, the flow guide pipe is fixedly connected with a synchronous wheel, the three synchronous wheels are wound with the same synchronous belt, two dragging blocks are fixedly connected into the connecting box, and the same positioning plate is placed on the two dragging blocks. Four test tubes are clamped on the positioning plate, and a limiting structure is arranged on the sealing cover; the time for replacing the test tube can be avoided, so that the extraction time is shortened, and the extraction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of solid phase extraction devices, specifically a solid phase extraction device for domestic sewage. Background Technology

[0002] Solid-phase extraction (SPE) is a sample pretreatment technique mainly used for the separation, purification, and concentration of samples. It separates target compounds from complex sample matrices through selective adsorption and elution. It is widely used in pharmaceuticals, food, environment, commodity inspection, and chemical industries. In the process of testing domestic sewage, solid-phase extraction is required to extract target compounds. The main steps of solid-phase extraction include activation, sample loading, rinsing, and elution.

[0003] However, traditional solid-phase extraction devices require the sealing cap to be removed and test tubes replaced after activation, sample loading, and rinsing. This process wastes time and reduces extraction efficiency.

[0004] Therefore, a more user-friendly solid-phase extraction device needs to be designed to address the above problems. Utility Model Content

[0005] To address the aforementioned issues, the solid-phase extraction device for domestic sewage provided by this invention avoids the need to spend time changing test tubes, thereby shortening the extraction time and improving the extraction efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A solid-phase extraction device for domestic sewage includes a connecting box with a sealing cover at its top. The sealing cover has an extraction structure, which includes switching valves and an extraction column. Two switching valves are installed on the sealing cover, with the extraction column engaged at the top of each valve. A guide pipe is rotatably connected to the bottom of each valve. A connecting shaft is rotatably connected to the sealing cover, and a synchronous pulley is fixedly connected to the bottom of the connecting shaft. A synchronous pulley is also fixedly connected to the guide pipe. A synchronous belt is wound around the three synchronous pulleys. Two drag blocks are fixedly connected inside the connecting box, and a positioning plate is placed on each drag block. Four test tubes are engaged on the positioning plate. A limiting structure is provided on the sealing cover.

[0008] Optionally, in one embodiment of the present invention, two positioning posts are fixedly connected to the drag block, and the four positioning posts penetrate the same positioning plate.

[0009] Optionally, in one embodiment of this utility model, the three synchronous pulleys form a triangular structure, and the cross-section of the top of the positioning column is trapezoidal.

[0010] Optionally, in one embodiment of the present invention, the cross-section of the end of the guide tube is L-shaped, one end of the guide tube is located directly above the adjacent test tube, and the two test tubes located on both sides of the switch valve are symmetrically arranged about the switch valve.

[0011] Optionally, in one embodiment of the present invention, a sealing gasket is engaged at the top of the connecting box, and the sealing gasket abuts against the sealing cover.

[0012] Optionally, in one embodiment of the present invention, two transparent plates are fixedly connected to both sides of the connecting box, and a pressure regulating valve is installed on one side of the connecting box.

[0013] Optionally, in one embodiment of the present invention, the limiting structure includes a connecting piece and an insert block. The connecting piece is fixedly connected to the connecting shaft, and the insert block is slidably connected to the connecting piece. The sealing cover is provided with two slots, and the bottom end of the insert block engages with one of the slots.

[0014] Optionally, in one embodiment of the present invention, a reset spring is sleeved on the outside of the insert block, one end of the reset spring abuts against the insert block, and the other end of the reset spring abuts against the connecting piece.

[0015] Optionally, in one embodiment of the present invention, the connecting piece and the connecting shaft form an L-shaped structure, the two slots are symmetrically distributed about the axis of the connecting shaft, and the connecting line between the two slots passes through the axis of the connecting shaft.

[0016] Optionally, in one embodiment of the present invention, the cross-section of one end of the insert is T-shaped, and the cross-section of the other end of the insert is trapezoidal.

[0017] Beneficial effects of this utility model

[0018] This utility model relates to a solid-phase extraction device for domestic sewage. In use, the solid to be extracted is placed inside the extraction column, and then undergoes activation, sample loading, and rinsing operations in sequence. The target compound is adsorbed by the solid. Waste liquid is generated during activation, sample loading, and rinsing, and is stored in two test tubes. When elution is needed, the connecting shaft is rotated. The rotation of the connecting shaft drives one synchronous wheel, which in turn drives two other synchronous wheels via a synchronous belt. The rotation of the other two synchronous wheels drives two guide tubes. When the guide tubes rotate 180 degrees, a limiting structure restricts the connecting shaft, preventing it from rotating. At this point, the end of the guide tube is directly above the other two test tubes, allowing elution to begin. During elution, the target compound inside the solid enters the other two test tubes along with the eluent for collection, thus completing the extraction of the target compound. Because the sealing caps do not need to be moved to replace the test tubes during extraction, the extraction time is shortened, and the extraction efficiency is improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the connection structure between the guide tube and the synchronous wheel of this utility model;

[0022] Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below;

[0023] Figure 4 This is a schematic diagram of the connection structure between the synchronous pulley and the synchronous belt of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Connecting box; 2. Sealing cover; 3. Extraction structure; 3. Switch valve; 301. Extraction column; 302. Guide tube; 303. Synchronous pulley; 304. Synchronous belt; 305. Connecting shaft; 306. Trailing block; 307. Positioning column; 308. Positioning plate; 309. Test tube; 310. Limiting structure; 4. Connecting piece; 401. Insert block; 402. Return spring; 403. Slot; 404. Sealing gasket; 5. Pressure regulating valve; 6. Transparent plate; 7. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments. Example 1

[0026] To make the solid-phase extraction device easier to use, a solid-phase extraction device for domestic sewage was designed, and the specific scheme is as follows:

[0027] like Figure 1-4 As shown, the solid-phase extraction device for domestic sewage includes a connecting box 1. A sealing cover 2 is engaged at the top of the connecting box 1. An extraction structure 3 is provided on the sealing cover 2. The extraction structure 3 includes a switching valve 301 and an extraction column 302. Two switching valves 301 are installed on the sealing cover 2. The top of the switching valve 301 is engaged with the extraction column 302. A guide pipe 303 is rotatably connected to the bottom of the switching valve 301. A connecting shaft 306 is rotatably connected to the sealing cover 2. A synchronous wheel 304 is fixedly connected to the bottom of the connecting shaft 306. A synchronous wheel 304 is fixedly connected to the guide pipe 303. The same synchronous belt 305 is wound around the three synchronous wheels 304. Two drag blocks 307 are fixedly connected inside the connecting box 1. The same positioning plate 309 is placed on the two drag blocks 307. Four test tubes 310 are engaged on the positioning plate 309. A limiting structure 4 is provided on the sealing cover 2.

[0028] like Figure 2 As shown, two positioning posts 308 are fixedly connected to the drag block 307, and the four positioning posts 308 penetrate the same positioning plate 309. Therefore, the positioning plate 309 can be positioned by the four positioning posts 308 during the placement process.

[0029] like Figure 2 and Figure 4 As shown, the three synchronous pulleys 304 form a triangular structure, and the top of the positioning post 308 has a trapezoidal cross-section, which can guide the positioning post 308 when it passes through the positioning plate 309.

[0030] like Figure 2 As shown, the cross-section of the end of the guide tube 303 is L-shaped. One end of the guide tube 303 is located directly above the adjacent test tube 310. The two test tubes 310 located on both sides of the switch valve 301 are symmetrically arranged about the switch valve 301. Therefore, when the guide tube 303 is rotated 180 degrees, its end can be directly above the other test tube 310.

[0031] like Figure 2 As shown, a sealing gasket 5 is engaged at the top of the connecting box 1, and the sealing gasket 5 abuts against the sealing cover 2, thereby improving the sealing performance between the sealing cover 2 and the connecting box 1.

[0032] like Figure 1 As shown, two transparent plates 7 are fixedly connected to both sides of the connecting box 1. A pressure regulating valve 6 is installed on one side of the connecting box 1, so the internal situation of the connecting box 1 can be observed through the transparent plates 7.

[0033] like Figure 2 and Figure 3 As shown, the limiting structure 4 includes a connecting piece 401 and an insert 402. The connecting piece 401 is fixedly connected to the connecting shaft 306, and the insert 402 is slidably connected to the connecting piece 401. The sealing cover 2 is provided with two slots 404. The bottom end of the insert 402 is engaged with one of the slots 404. A return spring 403 is sleeved on the outside of the insert 402. One end of the return spring 403 abuts against the insert 402, and the other end of the return spring 403 abuts against the connecting piece 401. Therefore, the connecting shaft 306 can be limited, thereby preventing the end of the guide tube 303 from deviating from the top of the test tube 310, thus improving the stability of use.

[0034] like Figure 3 As shown, the connecting piece 401 and the connecting shaft 306 have an L-shaped structure. The two slots 404 are symmetrically distributed about the axis of the connecting shaft 306. The line connecting the two slots 404 passes through the axis of the connecting shaft 306. The cross-section of one end of the insert 402 is T-shaped, and the cross-section of the other end of the insert 402 is trapezoidal. Therefore, it can play a guiding role when the insert 402 and the slot 404 are engaged.

[0035] Instructions for use:

[0036] During use, one end of the pressure regulating valve 6 can be connected to the vacuum pump. Under the action of the vacuum pump and the pressure regulating valve 6, a certain negative pressure can be maintained inside the connecting box 1. The solid to be extracted can be placed inside the extraction column 302, and then undergo activation, sample loading and rinsing operations in sequence. At this time, the target compound will be adsorbed by the solid. Waste liquid will be generated during the activation, sample loading and rinsing process. This waste liquid will be stored through two test tubes 310. When elution is required, the insert 402 can be pulled, and the return spring 403 will retract. When one end of the insert 402 is not engaged with one of the slots 404, the connecting shaft 306 can be rotated through the connecting piece 401. The rotation of the connecting shaft 306 will drive one of the synchronous pulleys 304 to rotate. The rotation of one synchronous pulley 304 will drive the other two synchronous pulleys 304 to rotate through the synchronous belt 305. The rotation of the step wheel 304 will drive the two guide tubes 303 to rotate respectively. After the guide tube 303 rotates 180 degrees, the insert block 402 will engage with the other slot 404 under the action of the return spring 403. At this time, the connecting shaft 306 cannot rotate, and the end of the guide tube 303 will be directly above the other two test tubes 310. Then the eluent can be added to the inside of the extraction column 302. Then the switch valve 301 can be opened. After the switch valve 301 is opened, the eluent inside the extraction column 302 will flow under the action of negative pressure. During the flow of the eluent, the target compound inside the solid will enter the inside of the other two test tubes 310 for collection, thereby completing the extraction of the target compound. Since it is not necessary to move the sealing cap 2 to replace the test tubes 310 during the extraction process, the extraction time is shortened and the extraction efficiency is improved.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A solid-phase extraction device for domestic sewage, including a connecting box, characterized in that: The top of the connecting box is fitted with a sealing cap, which is equipped with an extraction structure. The extraction structure includes a switching valve and an extraction column. Two switching valves are installed on the sealing cap, and the top of each switching valve is fitted with an extraction column. A guide tube is rotatably connected to the bottom of each switching valve. A connecting shaft is rotatably connected to the sealing cap, and a synchronous pulley is fixedly connected to the bottom of the connecting shaft. A synchronous pulley is fixedly connected to the guide tube, and the same synchronous belt is wound around the three synchronous pulleys. Two drag blocks are fixedly connected inside the connecting box, and the same positioning plate is placed on the two drag blocks. Four test tubes are fitted on the positioning plate, and the sealing cap is equipped with a limiting structure.

2. The solid-phase extraction device for domestic sewage according to claim 1, characterized in that: Two positioning posts are fixedly connected to the drag block, and the four positioning posts pass through the same positioning plate.

3. The solid-phase extraction device for domestic sewage according to claim 2, characterized in that: The three synchronous pulleys form a triangular structure, and the top of the positioning column has a trapezoidal cross-section.

4. The solid-phase extraction device for domestic sewage according to claim 1, characterized in that: The cross-section of the end of the guide tube is L-shaped, and one end of the guide tube is located directly above the adjacent test tube. The two test tubes located on both sides of the switch valve are symmetrically arranged about the switch valve.

5. The solid-phase extraction device for domestic sewage according to claim 1, characterized in that: A sealing gasket is engaged at the top of the connecting box, and the sealing gasket abuts against the sealing cover.

6. The solid-phase extraction device for domestic sewage according to claim 1, characterized in that: Two transparent plates are fixedly connected to both sides of the connecting box, and a pressure regulating valve is installed on one side of the connecting box.

7. The solid-phase extraction device for domestic sewage according to claim 1, characterized in that: The limiting structure includes a connecting piece and an insert block. The connecting piece is fixedly connected to the connecting shaft, and the insert block is slidably connected to the connecting piece. The sealing cover is provided with two slots, and the bottom end of the insert block engages with one of the slots.

8. The solid-phase extraction device for domestic sewage according to claim 7, characterized in that: A reset spring is sleeved on the outside of the insert block. One end of the reset spring abuts against the insert block, and the other end of the reset spring abuts against the connecting piece.

9. The solid-phase extraction device for domestic sewage according to claim 7, characterized in that: The connecting piece and the connecting shaft have an L-shaped structure, the two slots are symmetrically distributed about the axis of the connecting shaft, and the line connecting the two slots passes through the axis of the connecting shaft.

10. The solid-phase extraction device for domestic sewage according to claim 7, characterized in that: The cross-section of one end of the insert is T-shaped, and the cross-section of the other end of the insert is trapezoidal.

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