Solid phase extraction vacuum device with waste liquid recovery structure

Abstract

The utility model discloses a solid -phase extraction vacuumizing device with waste liquid recovery structure, including solid -phase extraction vacuumizing device body, the solid -phase extraction vacuumizing device body includes glass tank, the top of glass tank is fixedly connected with the top cap, and the top of top cap is embedded and is fixed with a plurality of flow control valve that links to each other with glass tank inside, and the right side of glass tank is fixed with vacuum extraction mechanism and is linked together. The utility model discloses a series of structure's setting can be stable fixed to the extraction bottle when operating to the column, can effectively reduce the risk of collision and dump in the operation process, improve work stability, and can when more waste liquid in the glass tank inside, automatic discharge operation can effectively reduce the situation that more waste liquid is inhaled by vacuum pump, thereby improve use safety, and can be on -line alternation replacement to two waste liquid collection barrels, reduce downtime replacement waiting time, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of solid phase extraction vacuum equipment, and in particular to a solid phase extraction vacuum device with a waste liquid recovery structure. Background Technology

[0002] Solid phase extraction (SPE) technology is the core step in the pretreatment of food for the detection of harmful residues (such as aflatoxin M, B, G and fumonisins). Its column efficiency and stability directly affect the accuracy and reliability of the detection results. Currently available solid phase extraction vacuum devices consist of a glass cylinder, a rigid, deformation-resistant top cover (equipped with a waterproof Luer needle seat and Luer plug), as well as flow control valves, vacuum pumps and other devices.

[0003] Currently, mainstream solid-phase extraction vacuum devices on the market have the following key defects, making it difficult to meet actual testing needs: 1. Traditional devices lack a waste liquid monitoring and discharge structure, which can easily lead to a large amount of waste liquid being sucked into the vacuum pump, causing damage to the pump body; 2. In the existing technology, the extraction bottle needs to be placed separately on the experimental table, and it is easy to be knocked over due to collision during the column chromatography process, resulting in the loss of purified sample. Therefore, this application proposes a solid-phase extraction vacuum device with a waste liquid recovery structure. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a solid-phase extraction vacuum device with a waste liquid recovery structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A solid-phase extraction vacuum device with a waste liquid recovery structure includes a solid-phase extraction vacuum device body, the solid-phase extraction vacuum device body including a glass tank, a top cover fixedly connected to the top of the glass tank, a plurality of flow control valves communicating with the interior of the glass tank being embedded and fixed on the top of the top cover, and a vacuum extraction mechanism being connected and fixed to the right side of the glass tank, and further including:

[0007] An extraction bottle fixing mechanism is installed on the top of the top cover and is used to fix the extraction bottle.

[0008] An automatic waste liquid collection mechanism is installed on the glass tank, and the automatic waste liquid collection mechanism includes:

[0009] The PLC controller is fixedly connected to the left side of the glass tank;

[0010] An ultrasonic liquid level sensor is fixedly connected to the bottom of the top cover and electrically connected to the PLC controller. The ultrasonic liquid level sensor is used to monitor the liquid level of the waste liquid inside the glass tank and transmit the monitored signal to the PLC controller. Its principle is based on existing technology.

[0011] The first solenoid valve is fixed to the bottom right side of the glass tank and electrically connected to the PLC controller. The PLC controller is used to control the opening and closing of the first solenoid valve.

[0012] A three-way pipe is connected to the right end of the first solenoid valve;

[0013] The waste liquid monitoring, collection, and early warning component consists of two sets, which are respectively connected and fixed to the top and bottom of the three-way pipe. The waste liquid monitoring, collection, and early warning component is electrically connected to the PLC controller. The waste liquid monitoring, collection, and early warning component is used to collect waste liquid and provide early warnings to personnel.

[0014] Preferably, the extraction bottle fixing mechanism includes a fixing seat, which is installed on the top of the top cover. Multiple extraction bottle fixing sleeves are embedded and fixed on the top of the fixing seat. The multiple extraction bottle fixing sleeves are set one-to-one with multiple flow control valves. Multiple anti-slip protrusions are bonded and fixed on the inner wall of the extraction bottle fixing sleeve. A bolt hole is opened on the top left side of the extraction bottle fixing sleeve. A T-shaped clamping bolt is threaded in the bolt hole and used to clamp and fix the extraction bottle.

[0015] Preferably, two support rods are fixedly connected to both sides of the bottom of the fixed base, and the bottom end of the support rods is fixedly connected to the top of the top cover, thereby realizing the connection between the top cover and the fixed base through the support rods.

[0016] Preferably, the bottom end of the support rod does not need to contact the top end of the top cover. A silicone suction cup is glued to the bottom end of the support rod, and the silicone suction cup adheres to the top end of the top cover. The suction force of the silicone suction cup can be used to fix the mounting base.

[0017] Preferably, the waste liquid monitoring, collection, and early warning component includes an L-shaped tube. Two L-shaped tubes are respectively connected and fixed to the top and bottom of a three-way pipe. A first flow sensor is connected and fixed to the right end of the L-shaped tube. The first flow sensor is used to measure the flow rate of the waste liquid. A second solenoid valve is connected and fixed to the right end of the first flow sensor. An alarm light is fixedly connected to the side of each of the two L-shaped tubes that is far apart from each other. The second solenoid valve, the first flow sensor, and the alarm light are all electrically connected to a PLC controller. A connecting hose is connected and fixed to the right side of the second solenoid valve. A waste liquid collection tank is provided on the right side of the second solenoid valve. One end of the connecting hose extends into the waste liquid collection tank. A counterweight block located in the corresponding waste liquid collection tank is fixedly sleeved on the bottom outer side of the connecting hose. The counterweight block is used to provide a downward pull force to the connecting hose, reducing the possibility of the connecting hose moving out of the waste liquid collection tank during the waste liquid collection process.

[0018] Preferably, an observation hole is provided on the inner front wall of the glass tank, and an observation glass is fixedly fitted inside the observation hole. The front side of the observation glass is provided with scale lines, and the liquid level inside the glass tank can be monitored through the observation glass.

[0019] Preferably, the waste liquid collection bucket is made of transparent material, and the inner diameter of the opening of the waste liquid collection bucket is larger than the outer diameter of the corresponding counterweight, so that the counterweight can be removed from the waste liquid collection bucket.

[0020] Compared with existing technologies, the beneficial effects of this utility model are:

[0021] 1. The extraction bottle fixing mechanism can be used to fix the extraction bottle during column operation, which can effectively reduce the risk of collision and tipping during operation and improve the stability of operation.

[0022] 2. With the automatic waste liquid collection mechanism, the system can automatically discharge waste liquid when there is a large amount of waste liquid inside the glass tank. This effectively reduces the risk of large amounts of waste liquid being sucked into the vacuum pump, thereby improving safety. In addition, during the waste liquid discharge process, when one waste liquid collection tank is full, the system can switch to another waste liquid collection tank to continue collecting waste liquid continuously and remind personnel to replace the full waste liquid collection tank. This achieves the goal of replacing waste liquid collection tanks without stopping the machine, reducing downtime and waiting time, and thus improving work efficiency.

[0023] This invention, through a series of structural designs, can stably fix the extraction bottle during column operation, effectively reducing the risk of collision and tipping during operation, improving work stability, and automatically discharging waste liquid when there is a large amount of waste liquid inside the glass tank, effectively reducing the possibility of large amounts of waste liquid being sucked into the vacuum pump, thereby improving safety. Furthermore, it can alternately replace the two waste liquid collection tanks without stopping the machine, reducing downtime for replacement and improving work efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a solid-phase extraction vacuum device with a waste liquid recovery structure according to Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the main cross-sectional structure of a solid-phase extraction vacuum device with a waste liquid recovery structure according to Embodiment 1 of this utility model;

[0026] Figure 3 for Figure 2 Enlarged structural diagram of section A;

[0027] Figure 4This is a front cross-sectional view of a solid-phase extraction vacuum device with a waste liquid recovery structure proposed in Embodiment 2 of this utility model.

[0028] In the diagram: 1. Glass tank; 101. Top cover; 102. Flow control valve; 2. Vacuum extraction mechanism; 3. Extraction bottle fixing mechanism; 301. Extraction bottle fixing sleeve; 302. T-shaped clamping bolt; 303. Anti-slip protrusion; 304. Fixing base; 305. Support rod; 306. Silicone suction cup; 4. Automatic waste liquid collection mechanism; 401. PLC controller; 402. Ultrasonic liquid level sensor; 403. First solenoid valve; 404. T-connector; 405. L-shaped pipe; 406. First flow sensor; 407. Alarm light; 408. Second solenoid valve; 409. Connecting hose; 410. Waste liquid collection tank; 411. Counterweight; 412. Observation glass. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example 1

[0031] Reference Figure 1 A solid-phase extraction vacuum device with a waste liquid recovery structure includes a solid-phase extraction vacuum device body, which includes a glass tank 1. A top cover 101 is fixedly connected to the top of the glass tank 1. A plurality of flow control valves 102 that communicate with the inside of the glass tank 1 are embedded and fixed on the top of the top cover 101. A vacuum extraction mechanism 2 is fixedly connected to the right side of the glass tank 1.

[0032] It should be noted that the vacuum extraction mechanism 2 includes a second flow sensor, a gas regulating valve, and a vacuum pump. The vacuum pump evacuates the inside of the glass tank 1. The second flow sensor can detect the gas flow rate, and the gas regulating valve can adjust the flow rate of the gas. The entire vacuum extraction principle is also existing technology and will not be elaborated here.

[0033] Furthermore:

[0034] Reference Figure 1-3 A solid-phase extraction vacuum device with a waste liquid recovery structure further includes:

[0035] Extraction bottle fixing mechanism 3 is installed on the top of top cover 101 and is used to fix the extraction bottle.

[0036] The extraction bottle fixing mechanism 3 includes a fixing seat 304, which is installed on the top of the top cover 101. Two support rods 305 are fixedly connected to both sides of the bottom of the fixing seat 304. The bottom end of the support rods 305 is fixedly connected to the top of the top cover 101, and the connection between the top cover 101 and the fixing seat 304 is achieved through the support rods 305. Multiple extraction bottle fixing sleeves 301 are embedded and fixed on the top of the fixing seat 304. Multiple mounting holes for fixing the extraction bottle fixing sleeves 301 are opened on the top of the fixing seat 304. Multiple extraction bottle fixing sleeves 301 are set one-to-one with multiple flow control valves 102. Multiple anti-slip protrusions 303 are bonded and fixed on the inner wall of the extraction bottle fixing sleeve 301. A bolt hole is opened on the top left side of the extraction bottle fixing sleeve 301. A T-shaped clamping bolt 302 is threaded in the bolt hole and used to clamp and fix the extraction bottle.

[0037] In this implementation scheme: During column loading, the extraction bottle is inserted into the corresponding extraction bottle fixing sleeve 301, and the extraction bottle is aligned and connected with the corresponding flow control valve 102. Then, the corresponding T-shaped clamping bolt 302 is rotated forward. As the T-shaped clamping bolt 302 rotates, it makes close contact with the outside of the corresponding extraction bottle. By utilizing the clamping force between the T-shaped clamping bolt 302 and the extraction bottle, combined with the friction of multiple anti-slip protrusions 303, the extraction bottle can be stably fixed in the corresponding extraction bottle fixing sleeve 301, thereby improving the stability of the extraction bottle during use.

[0038] Furthermore:

[0039] A solid-phase extraction vacuum device with a waste liquid recovery structure further includes an automatic waste liquid collection mechanism 4, which is installed on a glass tank 1. The automatic waste liquid collection mechanism 4 includes:

[0040] The PLC controller 401 is fixedly connected to the left side of the glass tank 1. An observation hole is provided on the inner front wall of the glass tank 1. An observation glass 412 is fixedly fitted inside the observation hole. The front side of the observation glass 412 is provided with scale lines. The liquid level inside the glass tank 1 can be monitored through the observation glass 412.

[0041] The ultrasonic liquid level sensor 402 is fixedly connected to the bottom of the top cover 101 and electrically connected to the PLC controller 401. The ultrasonic liquid level sensor 402 is used to monitor the liquid level of the waste liquid inside the glass tank 1 and transmit the monitored signal to the PLC controller 401.

[0042] The first solenoid valve 403 is fixed to the bottom right side of the glass tank 1 and is electrically connected to the PLC controller 401. The PLC controller 401 is used to control the opening and closing of the first solenoid valve 403.

[0043] The three-way pipe 404 is connected to the right end of the first solenoid valve 403.

[0044] The waste liquid monitoring, collection and early warning component consists of two sets, which are respectively connected and fixed to the top and bottom of the three-way pipe 404. The waste liquid monitoring, collection and early warning component is electrically connected to the PLC controller 401. The waste liquid monitoring, collection and early warning component is used to collect waste liquid and provide early warning to personnel.

[0045] The waste liquid monitoring, collection, and early warning component includes two L-shaped tubes 405, which are respectively connected and fixed to the top and bottom of a three-way pipe 404. A first flow sensor 406 is fixedly connected to the right end of each L-shaped tube 405. The first flow sensor 406 is used to measure the flow rate of the waste liquid. A second solenoid valve 408 is fixedly connected to the right end of the first flow sensor 406. Alarm lights 407 are fixedly connected to the sides of the two L-shaped tubes 405 that are furthest from each other. The alarm lights 407 are used to alert personnel. The second solenoid valve 408, the first flow sensor 406, and the alarm lights 407 are all electrically connected to a PLC controller 401. A connecting hose 409 is fixedly connected to the right side of the second solenoid valve 408. A waste liquid collection tank 410 is provided on the right side of 408. One end of a connecting hose 409 extends into the waste liquid collection tank 410. A counterweight 411 is fixedly fitted on the bottom outer side of the connecting hose 409 and located inside the corresponding waste liquid collection tank 410. The counterweight 411 is used to provide a downward pulling force to the connecting hose 409, reducing the possibility of the connecting hose 409 moving out of the waste liquid collection tank 410 during the waste liquid collection process. The waste liquid collection tank 410 is made of transparent material, which facilitates personnel to monitor the liquid level inside the waste liquid collection tank 410. The inner diameter of the opening of the waste liquid collection tank 410 is larger than the outer diameter of the corresponding counterweight 411, so that the counterweight 411 can be moved out of the waste liquid collection tank 410.

[0046] In this implementation scheme: During the column flow operation, the ultrasonic level sensor 402 monitors the waste liquid level inside the glass tank 1 and transmits it to the PLC controller 401. The PLC controller 401 converts the received standard electrical signal into an actual liquid level value via analog-to-digital conversion. When the liquid level reaches a preset value, the PLC controller 401 controls the first solenoid valve 403 to open and the upper second solenoid valve 408 to open. This allows the waste liquid inside the glass tank 1 to flow sequentially through the first solenoid valve 403, the three-way pipe 404, the upper L-shaped pipe 405, the upper first flow sensor 406, the upper second solenoid valve 408, and the upper connecting hose 409 into the waste liquid collection tank 410. Simultaneously, the upper first flow sensor 406 measures the amount of waste liquid flowing through and transmits this data to the PLC controller 401. The PLC controller 401 converts the received standard electrical signal into a metering value through analog-to-digital conversion. When the metering value reaches the preset value, the PLC controller 401 controls the upper second solenoid valve 408 to close and controls the upper alarm light 407 to turn on to remind personnel to replace the waste liquid collection tank 410. At the same time, it controls the lower second solenoid valve 408 to open, so that the waste liquid enters the lower waste liquid collection tank 410 in sequence through the lower L-shaped pipe 405, the lower first flow sensor 406, the lower second solenoid valve 408, and the lower connecting hose 409. The ultrasonic liquid level sensor 402 continuously monitors the liquid level of the waste liquid inside the glass tank 1. When the liquid level is lower than the set value, the PLC controller 401 controls the first solenoid valve 403 and the lower second solenoid valve 408 to close, thereby completing the purpose of automatic waste liquid discharge.

[0047] In addition, during the waste liquid discharge process, when one of the waste liquid collection tanks 410 is full, the other waste liquid collection tank 410 is switched to continue collecting continuously, and personnel are reminded to replace the full waste liquid collection tank 410, so as to achieve the purpose of replacing the waste liquid collection tank 410 without stopping the machine.

[0048] It should be noted that: the PLC controller 401 is preferably a controller of Siemens S7-1200 series, the first electromagnetic valve 403 and the second electromagnetic valve 408 are preferably Burkert type 5282 electromagnetic valves, the first flow sensor 406 is preferably an ifm SM series flow sensor, the ultrasonic liquid level sensor 402 is preferably Siemens SITRANS LUT420, which provides 4-20mA analog output signal, and the alarm light 407 is preferably a signal light matched with Schneider Zelio Relays. The cooperative control principle therebetween is as follows: the PLC controller 401 serves as a central controller, which monitors waste liquid level in real time through the ultrasonic liquid level sensor 402, and transmits a 4-20mA analog signal (corresponding to 0-full range liquid level) to the analog input (AI) channel of the PLC controller 401. After the signal received by the internal program of the PLC controller 401 is subjected to analog-to-digital conversion (ADC), it is compared with the "high liquid level preset value" set in the program, and when the high set value is reached, the first electromagnetic valve 403 and the upper second electromagnetic valve 408 are automatically opened to start the liquid draining process; in this process, the first flow sensor 406 measures the discharged waste liquid, and when the accumulated value reaches the preset volume, the PLC controller 401 automatically closes the upper pipeline and triggers the alarm light 407, and simultaneously seamlessly opens the lower second electromagnetic valve 408 to switch to the standby collection barrel, thereby realizing uninterrupted automatic operation of waste liquid collection and full-load reminding, until the liquid level drops to the low set value, the PLC controller 401 closes all electromagnetic valves to complete the whole cycle.

[0049] Working principle: when performing column passing operation, insert an extraction bottle into the corresponding extraction bottle fixing sleeve 301, and make the extraction bottle inserted and communicated with the corresponding flow control valve 102 oppositely, then positively rotate the corresponding T-shaped pressing bolt 302. While rotating, the T-shaped pressing bolt 302 is in close contact with the outer side of the corresponding extraction bottle, by virtue of the pressing force between the T-shaped pressing bolt 302 and the extraction bottle and the friction force of a plurality of anti-skid protrusions 303, the extraction bottle can be stably fixed in the corresponding extraction bottle fixing sleeve 301. By fixing the extraction bottle during column passing operation, the risk of collision and dumping in the operation process can be effectively reduced, and the working stability is improved;

[0050] The liquid level values ​​for opening and closing the first solenoid valve 403 and the flow rate and liquid level values ​​for opening and closing the second solenoid valve 408 are preset via the PLC controller 401. During the column flow operation, the ultrasonic liquid level sensor 402 monitors the waste liquid level inside the glass tank 1 and converts the monitored liquid level value into a standard electrical signal, which is then transmitted to the PLC controller 401. The PLC controller 401 converts the received standard electrical signal into an actual liquid level value via analog-to-digital conversion. When the liquid level value reaches the preset value, the PLC controller 401... The first solenoid valve 403 is opened, and the second solenoid valve 408 above it is also opened. This allows the waste liquid inside the glass tank 1 to flow sequentially through the first solenoid valve 403, the three-way pipe 404, the upper L-shaped pipe 405, the upper first flow sensor 406, the upper second solenoid valve 408, and the upper connecting hose 409 into the waste liquid collection tank 410. The waste liquid collection tank 410 collects the waste liquid, while the upper first flow sensor 406 measures the amount of waste liquid flowing through it and converts the measured value into a standard electrical signal, which is then transmitted to the tank. The PLC controller 401 converts the received standard electrical signal into a metering value through analog-to-digital conversion. When the metering value reaches the preset value, the PLC controller 401 controls the upper second solenoid valve 408 to close and controls the upper alarm light 407 to turn on to remind personnel to replace the waste liquid collection tank 410. At the same time, it controls the lower second solenoid valve 408 to open, so that the waste liquid enters the lower waste liquid collection tank 410 in sequence through the lower L-shaped pipe 405, the lower first flow sensor 406, the lower second solenoid valve 408, and the lower connecting hose 409. The ultrasonic liquid level sensor 402 continuously monitors the liquid level of the waste liquid inside the glass tank 1. When the liquid level is lower than the set value, the PLC controller 401 controls the first solenoid valve 403 and the lower second solenoid valve 408 to close, thereby completing the purpose of automatic waste liquid discharge, reducing the possibility of the vacuum pump sucking in a large amount of waste liquid, thus improving the safety of use. In addition, with the observation glass 412 and the scale line on it, it is convenient for personnel to clearly understand the liquid level in the glass tank 1.

[0051] In addition, during the waste liquid discharge process, when one waste liquid collection tank 410 is full, the other waste liquid collection tank 410 is switched to continue collecting continuously, and personnel are reminded to replace the full waste liquid collection tank 410. This achieves the purpose of replacing the waste liquid collection tank 410 without stopping the machine, reducing downtime waiting time for replacement, thereby improving work efficiency. When replacing the waste liquid collection tank 410, the connecting hose 409 can be directly pulled out from the corresponding waste liquid collection tank 410 for replacement, which is convenient for personnel operation.

[0052] Example 2

[0053] Reference Figure 4This embodiment differs from Embodiment 1 in that the bottom end of the support rod 305 does not need to contact the top of the top cover 101. A silicone suction cup 306 is glued and fixed to the bottom end of the support rod 305. The silicone suction cup 306 is attracted to the top of the top cover 101. The suction force of the silicone suction cup 306 can be used to fix the fixing seat 304.

[0054] The method of use in this embodiment is as follows: The difference from the first embodiment is that it also has the following function: The entire extraction bottle fixing mechanism 3 is fixed to the top of the top cover 101 by four silicone suction cups 306. When it needs to be removed later, one side of the silicone suction cup 306 can be directly lifted to release its adsorption force, which makes it convenient for personnel to remove the entire extraction bottle fixing mechanism 3 and install it on other devices, thus improving its flexibility of use.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A solid-phase extraction vacuum device with a waste liquid recovery structure, comprising a solid-phase extraction vacuum device body, wherein the solid-phase extraction vacuum device body includes a glass tank (1), a top cover (101) is fixedly connected to the top of the glass tank (1), a plurality of flow control valves (102) communicating with the interior of the glass tank (1) are embedded and fixedly installed on the top of the top cover (101), and a vacuum extraction mechanism (2) is fixedly connected to the right side of the glass tank (1), characterized in that, Also includes: An extraction bottle fixing mechanism (3) is installed on top of the top cover (101); An automatic waste liquid collection mechanism (4) is installed on the glass tank (1), and the automatic waste liquid collection mechanism (4) includes: The PLC controller (401) is fixedly connected to the left side of the glass tank (1); An ultrasonic liquid level sensor (402) is fixedly connected to the bottom of the top cover (101) and electrically connected to the PLC controller (401); The first solenoid valve (403) is fixed to the bottom right side of the glass tank (1) and electrically connected to the PLC controller (401); A three-way pipe (404) is connected to the right end of the first solenoid valve (403); The waste liquid monitoring and collection early warning component consists of two sets, which are respectively connected and fixed at the top and bottom of the three-way pipe (404). The waste liquid monitoring and collection early warning component is electrically connected to the PLC controller (401).

2. The solid-phase extraction vacuum device with waste liquid recovery structure according to claim 1, characterized in that, The extraction bottle fixing mechanism (3) includes a fixing seat (304), which is installed on the top of the top cover (101). Multiple extraction bottle fixing sleeves (301) are embedded and fixed on the top of the fixing seat (304). The multiple extraction bottle fixing sleeves (301) are set one-to-one with multiple flow control valves (102). Multiple anti-slip protrusions (303) are bonded and fixed on the inner wall of the extraction bottle fixing sleeve (301). A bolt hole is opened on the top left side of the extraction bottle fixing sleeve (301), and a T-shaped clamping bolt (302) is threaded in the bolt hole.

3. The solid-phase extraction vacuum device with waste liquid recovery structure according to claim 2, characterized in that, Two support rods (305) are fixedly connected to both sides of the bottom of the fixed base (304), and the bottom end of the support rod (305) is fixedly connected to the top of the top cover (101).

4. A solid-phase extraction vacuum device with a waste liquid recovery structure according to claim 3, characterized in that, The bottom end of the support rod (305) may not be in contact with the top of the top cover (101). A silicone suction cup (306) is glued and fixed to the bottom end of the support rod (305), and the silicone suction cup (306) is attracted to the top of the top cover (101).

5. A solid-phase extraction vacuum device with a waste liquid recovery structure according to claim 1, characterized in that, The waste liquid monitoring, collection, and early warning assembly includes two L-shaped tubes (405), which are respectively connected and fixed to the top and bottom of a three-way pipe (404). A first flow sensor (406) is fixedly connected to the right end of each L-shaped tube (405), and a second solenoid valve (408) is fixedly connected to the right end of the first flow sensor (406). Alarm lights (407) are fixedly connected to the sides of the two L-shaped tubes (405) that are furthest from each other. The second solenoid valve (408) and the first flow sensor (404) are also connected to the right end of the first flow sensor (406). The quantity sensor (406) and the alarm light (407) are both electrically connected to the PLC controller (401). A connecting hose (409) is fixedly connected to the right side of the second solenoid valve (408). A waste liquid collection tank (410) is provided on the right side of the second solenoid valve (408). One end of the connecting hose (409) extends into the waste liquid collection tank (410). A counterweight (411) located in the corresponding waste liquid collection tank (410) is fixedly sleeved on the bottom outer side of the connecting hose (409).

6. A solid-phase extraction vacuum device with a waste liquid recovery structure according to claim 1, characterized in that, An observation hole is provided on the inner front wall of the glass tank (1), and an observation glass (412) is fixedly fitted inside the observation hole. The observation glass (412) has scale lines on its front side.

7. A solid-phase extraction vacuum device with a waste liquid recovery structure according to claim 5, characterized in that, The waste liquid collection bucket (410) is made of transparent material, and the inner diameter of the opening of the waste liquid collection bucket (410) is larger than the outer diameter of the corresponding counterweight (411).

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