Sample pretreatment device for pesticide residue detection

Abstract

The utility model discloses a sample pretreatment device for pesticide residue detection, which comprises a shell, a feed port is arranged at the top of the shell, and an inner cavity of the shell is divided into a crushing cavity, an extracting cavity, a filtering cavity and a sampling cavity by a first filter plate, a partition plate and a second filter plate; a crushing mechanism is arranged in the crushing cavity, an extraction groove is formed in the extraction cavity, an electric heating piece and a temperature sensor are arranged on the inner wall of the extraction groove, and the extraction groove communicates with a buffer solution storage tank; an ultrasonic transducer is arranged in the extraction cavity, a conical buffer groove is formed in the upper portion of the sampling cavity, a vibration motor is arranged on the outer wall of the conical buffer groove, a sampling table is arranged below a discharging port of the conical buffer groove, a controller is further arranged on the shell, and the electric heating piece, the temperature sensor, the ultrasonic transducer and the vibration motor are all electrically connected with the controller. The second filter plate is movably connected with the shell in an inserted mode through an inserting groove in the shell, and a flexible scraping plate is arranged on the inner wall of the shell and located above the second filter plate. The device is high in extraction efficiency, convenient to clean and high in automation degree.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a sample pretreatment device for pesticide residue detection. Background Art

[0002] The development of agricultural industrialization has made the production of agricultural products increasingly dependent on exogenous substances such as pesticides, antibiotics and hormones. The amount of pesticides used in agricultural products in my country remains high, and the irrational use of these substances will inevitably lead to excessive pesticide residues in agricultural products, affecting consumer food safety. In serious cases, it will cause consumers to become ill, develop abnormally, or even directly lead to poisoning and death. Therefore, it is necessary to test pesticide residues in agricultural products to ensure food safety.

[0003] At present, the detection method mainly uses certain means to extract agricultural products, and uses detection instruments to monitor the pesticide residue content in the extract. The existing devices for extracting agricultural products mainly have the following problems: 1. Low extraction efficiency; 2. Inconvenient to clean; 3. Low degree of automation. Therefore, it is necessary to provide a new sample pretreatment device for pesticide residue detection to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a sample pretreatment device for pesticide residue detection is provided, which has high extraction efficiency, is convenient to clean and has a high degree of automation.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A sample pretreatment device for pesticide residue detection, comprising a shell, a feed port is arranged on the top of the shell, the inner cavity of the shell is divided into a crushing chamber, an extraction chamber, a filtering chamber and a sampling chamber through a first filter plate, a partition plate and a second filter plate; a crushing mechanism is arranged in the crushing chamber, an extraction tank is arranged in the extraction chamber, an electric heating plate and a temperature sensor are arranged on the inner wall of the extraction tank, and the extraction tank is connected to a buffer storage tank; at least one ultrasonic transducer is arranged on the inner wall of the extraction chamber, a conical buffer tank is arranged on the upper part of the sampling chamber, a vibration motor is arranged on the outer wall of the conical buffer tank, a sampling platform is arranged below the discharge port of the conical buffer tank, and a controller is also arranged on the shell, and the electric heating plate, the temperature sensor, the ultrasonic transducer and the vibration motor are all electrically connected to the controller;

[0007] The shell is provided with a slot on the top, the second filter plate is movably connected to the shell through the slot, a limit plate is provided at one end of the second filter plate, a flexible scraper with one end abutting against the second filter plate is provided on the inner wall of the shell above the second filter plate, and a first support plate is provided on the inner wall of the shell below one end of the second filter plate.

[0008] As an improvement of the above technical solution, the crushing mechanism includes a rotating shaft rotatably arranged in the crushing chamber and a crushing knife arranged on the rotating shaft, one end of the rotating shaft is connected to the output shaft of the driving motor, and the driving motor is fixed by a mounting bracket arranged on the side wall of the shell.

[0009] As an improvement of the above technical solution, the buffer storage tank is connected to the extraction tank through a liquid inlet pipe, a first electric valve is provided on the liquid inlet pipe, and the first electric valve is electrically connected to the controller.

[0010] As an improvement of the above technical solution, the buffer storage tank is supported and fixed by a second support plate arranged on the outside of the shell.

[0011] As an improvement of the above technical solution, the discharge port at the bottom of the extraction tank is connected to a discharge pipe extending into the filter cavity, and a second electric valve is provided on the discharge pipe, and the second electric valve is electrically connected to the controller.

[0012] As an improvement of the above technical solution, a liquid outlet pipe is provided at the bottom of the conical buffer tank, a third electric valve is provided at the liquid outlet pipe, and the third electric valve is electrically connected to the controller.

[0013] As an improvement of the above technical solution, a feed hopper is provided at the feed inlet.

[0014] As an improvement of the above technical solution, a sealing cover is threadedly connected to the feed hopper.

[0015] As an improvement of the above technical solution, a universal pulley is further provided at the bottom of the shell.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] The utility model provides a sample pretreatment device for pesticide residue detection, wherein a crushing chamber, an extraction chamber, a filtering chamber and a sampling chamber are respectively arranged in the shell, so as to realize the integration of crushing, extraction, filtering and sampling, with a high degree of automation and convenient use. By arranging an electric heating plate, a temperature sensor and an ultrasonic transducer on the inner wall of the extraction tank, the device can effectively extract under the action of heating and ultrasound, thereby improving the extraction efficiency. By arranging a vibration motor on the outer wall of the conical buffer tank, the device is convenient for discharging the filter residue adhering to the inner wall of the conical buffer tank when cleaning the filter residue.

[0018] The housing of the device is provided with a slot, the second filter plate is movably connected with the housing through the slot, a limit plate is provided at one end of the second filter plate, a flexible scraper with one end abutting against the second filter plate is provided on the inner wall of the housing above the second filter plate, and a first support plate is provided on the inner wall of the housing below one end of the second filter plate. Due to the above arrangement, when cleaning the device, by pulling the second filter plate, the filter residue falls into the conical buffer groove under the interaction between the second filter plate and the flexible scraper, which is convenient for subsequent cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

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

[0021] Figure 2 It is a schematic diagram of the partial internal structure of Example 1 of the utility model;

[0022] In the figure, 1, shell; 2, feed inlet; 3, first filter plate; 4, partition; 5, second filter plate; 6, crushing chamber; 7, extraction chamber; 8, filter chamber; 9, sampling chamber; 10, rotating shaft; 11, crushing knife; 12, driving motor; 13, mounting frame; 14, extraction tank; 15, electric heating plate; 16, temperature sensor; 17, buffer storage tank; 18, liquid inlet pipe; 19, first electric valve; 20, ultrasonic transducer; 21, conical buffer tank; 22, vibration motor; 23, sampling bottle; 24, sampling table; 25, discharge pipe; 26, second electric valve; 27, liquid discharge pipe; 28, third electric valve; 29, controller; 30, limit plate; 31, flexible scraper; 32, first support plate; 33, second support plate; 34, feed hopper; 35, sealing cover; 36, universal pulley. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown, a sample pretreatment device for pesticide residue detection includes a housing 1, a feed port 2 is provided at the top of the housing 1, and the inner cavity of the housing 1 is divided into a crushing chamber 6, an extraction chamber 7, a filtering chamber 8 and a sampling chamber 9 through a first filter plate 3, a partition plate 4 and a second filter plate 5; a crushing mechanism is provided in the crushing chamber 6, and the crushing mechanism includes a rotating shaft 10 rotatably arranged in the crushing chamber 6 and a crushing knife 11 arranged on the rotating shaft 10, one end of the rotating shaft 10 is connected to the output shaft of a driving motor 12, and the driving motor 12 is fixed by a mounting bracket 13 provided on the side wall of the housing 1. The sample to be extracted is added into the crushing chamber 6 through the feed port 2, and the driving motor 12 is started, and the rotating shaft 10 is driven by the driving motor 12, and the sample to be extracted is crushed under the action of the crushing knife 11, so as to facilitate subsequent extraction.

[0028] The extraction chamber 7 is provided with an extraction tank 14, and an electric heating plate 15 and a temperature sensor 16 are provided on the inner wall of the extraction tank 14. The buffer storage tank 17 is connected with the extraction tank 14 through a liquid inlet pipe 18, and a first electric valve 19 is provided on the liquid inlet pipe 18; at least one ultrasonic transducer 20 is provided on the inner wall of the extraction chamber 7. The first electric valve 19 is opened, and the buffer in the buffer storage tank 17 enters the extraction chamber 7 to mix with the crushed sample, and is heated by the electric heating plate 15. The temperature in the extraction chamber 7 is monitored by the temperature sensor 16. When the temperature reaches a certain value, the electric heating plate 15 is turned off, and the ultrasonic transducer 20 is turned on. Extraction is performed under the dual effects of ultrasound and heating, which greatly improves the extraction efficiency.

[0029] The discharge port at the bottom of the extraction tank 14 is connected to a discharge pipe 25 extending into the filter chamber 8, and a second electric valve 26 is arranged on the discharge pipe 25. A conical buffer tank 21 is arranged at the upper part of the sampling chamber 9, a vibration motor 22 is arranged on the outer wall of the conical buffer tank 21, and a sampling platform 24 is arranged below the discharge port of the conical buffer tank 21; a liquid outlet pipe 27 is arranged at the bottom of the conical buffer tank 21, and a third electric valve 28 is arranged at the liquid outlet pipe 27.

[0030] The housing 1 is also provided with a controller 29 , and the first electric valve 19 , the second electric valve 26 , the third electric valve 28 , the electric heating plate 15 , the temperature sensor 16 , the ultrasonic transducer 20 , the drive motor 12 , and the vibration motor 22 are all electrically connected to the controller 29 .

[0031] After the extraction is completed, the second electric valve 26 is opened by the controller 29, the feed liquid enters the filter chamber 8, is filtered by the second filter plate 5, and the filtrate enters the conical buffer tank 21. When sampling, the sampling bottle 23 is placed on the sampling table 24, the third electric valve 28 is opened by the controller 29, and the filtrate enters the sampling bottle 23 through the liquid outlet pipe 27.

[0032] The shell 1 is provided with a slot (not marked) on the top, and the second filter plate 5 is movably connected to the shell 1 through the slot, a limiting plate 30 is provided at one end of the second filter plate 5, and a flexible scraper 31 with one end abutting against the second filter plate 5 is provided on the inner wall of the shell 1 above the second filter plate 5, and a first support plate 32 is provided on the inner wall of the shell 1 below one end of the second filter plate 5.

[0033] After sampling, the device is cleaned. During cleaning, a waste trough is placed on the sampling table 24, and the second filter plate 5 is pulled out of the shell 1 through the limit plate 30. Under the action of the flexible scraper 31, the filter residue deposited on the second filter plate 5 falls into the conical buffer trough 21, the third electric valve 28 is opened, the vibration motor 22 is turned on, the filter residue enters the waste trough, and then clean water is pumped into the feed port 2 to rinse the device, and the waste liquid enters the waste trough, thereby realizing rapid cleaning of the device.

[0034] Furthermore, in this embodiment, the buffer storage tank 17 is supported and fixed by a second support plate 33 arranged on the outside of the shell 1 .

[0035] Furthermore, in this embodiment, a feed hopper 34 is provided at the feed port 2 .

[0036] Furthermore, in this embodiment, a sealing cover 35 is threadedly connected to the feed hopper 34 .

[0037] Furthermore, in this embodiment, a universal pulley 36 is also provided at the bottom of the housing 1 .

[0038] In addition, it should be understood that after reading the contents taught in the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A sample pretreatment device for pesticide residue detection, comprising a housing, characterized in that: A feed port is provided at the top of the shell, and the inner cavity of the shell is divided into a crushing chamber, an extraction chamber, a filtering chamber and a sampling chamber by a first filter plate, a partition plate and a second filter plate; a crushing mechanism is provided in the crushing chamber, an extraction tank is provided in the extraction chamber, an electric heating plate and a temperature sensor are provided on the inner wall of the extraction tank, and the extraction tank is connected to a buffer storage tank; at least one ultrasonic transducer is provided on the inner wall of the extraction chamber, a conical buffer tank is provided at the upper part of the sampling chamber, a vibration motor is provided on the outer wall of the conical buffer tank, and a sampling platform is provided below the discharge port of the conical buffer tank, and a controller is also provided on the shell, and the electric heating plate, the temperature sensor, the ultrasonic transducer and the vibration motor are all electrically connected to the controller; The shell is provided with a slot, the second filter plate is movably connected to the shell through the slot, a limit plate is provided at one end of the second filter plate, a flexible scraper with one end abutting against the second filter plate is provided on the inner wall of the shell above the second filter plate, and a first support plate is provided on the inner wall of the shell below one end of the second filter plate.

2. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: The pulverizing mechanism comprises a rotating shaft rotatably arranged in the pulverizing chamber and a pulverizing knife arranged on the rotating shaft, one end of the rotating shaft is connected to the output shaft of the driving motor, and the driving motor is fixed by a mounting frame arranged on the side wall of the shell.

3. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: The buffer storage tank is connected to the extraction tank through a liquid inlet pipe, and a first electric valve is arranged on the liquid inlet pipe. The first electric valve is electrically connected to the controller.

4. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: The buffer storage tank is supported and fixed by a second support plate arranged outside the shell.

5. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: The discharge port at the bottom of the extraction tank is connected to a discharge pipe extending into the filter cavity. A second electric valve is arranged on the discharge pipe. The second electric valve is electrically connected to the controller.

6. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: A liquid outlet pipe is arranged at the bottom of the conical buffer tank, a third electric valve is arranged at the liquid outlet pipe, and the third electric valve is electrically connected to the controller.

7. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: A feeding hopper is arranged at the feeding port.

8. A sample pretreatment device for pesticide residue detection according to claim 7, characterized in that: A sealing cover is threadedly connected to the feed hopper.

9. A sample pretreatment device for pesticide residue detection according to claim 1, characterized in that: A universal pulley is also provided at the bottom of the housing.

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