Liquid purification device for food detection

Abstract

The invention belongs to the technical field of sample preparation devices, and particularly relates to a liquid purification device for food detection, which comprises a purification shell, a centrifugal filtration mechanism, a weighing feedback mechanism, a telescopic communication mechanism, an extraction solvent mixing and adding mechanism, a material viscosity detection feedback mechanism, an anti-blocking cleaning mechanism, a mixing duration confirmation mechanism and a PLC (Programmable Logic Controller). The adding amount of the extraction solvent can be determined based on the purification dosage of the liquid food, the liquid food and the extraction solvent can be rapidly mixed together to react, subsequent centrifugal filtration purification operation is facilitated, the stirring duration is determined based on the purification dosage of the liquid food, and the stirring efficiency is improved. In the process of mixing and stirring liquid food and an extraction solvent, the viscosity degree of a material sample can be automatically detected and fed back, and the cleaning frequency of a centrifugal filtering mechanism is determined based on the viscosity degree.

Description

Technical Field

[0001] The invention belongs to the technical field of sample preparation devices, and in particular relates to a liquid purification device for food testing. Background Art

[0002] Food testing is an important means to ensure food safety. Food may contain pesticide residues, veterinary drug residues, heavy metals, microorganisms and other harmful substances. Through testing, these potential risks can be discovered in time to prevent harm to consumers' health.

[0003] The centrifugal filtration purification device can quickly and effectively separate suspended particles in the liquid and ensure the purification efficiency of liquid food. However, during the centrifugal purification process, for food liquid samples with high viscosity, the equipment will be blocked, which will lead to poor separation effect. Therefore, the equipment needs to be cleaned regularly, but the cleaning frequency is fixed. For samples with high viscosity, it will be more prone to blockage. The lower cleaning frequency cannot meet the cleaning requirements, affecting the quality and efficiency of the purification. For samples with low viscosity, too high a cleaning frequency will affect the continuity of the entire purification work and affect its use. Summary of the invention

[0004] The object of the present invention is to provide a liquid purification device for food testing in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a liquid purification device for food testing, comprising a purification shell, and also comprising: A centrifugal filtering mechanism is fixedly mounted on the bottom of the inner wall of the purification shell; A weighing feedback mechanism is fixedly mounted on the top of the purification shell; A telescopic communication mechanism, fixedly connected between the weighing feedback mechanism and the centrifugal filtering mechanism; An extraction solvent mixing and adding mechanism is fixedly mounted on the upper end of the weighing feedback mechanism; A material viscosity detection feedback mechanism is installed on the extraction solvent mixing and adding mechanism; An anti-clogging cleaning mechanism is fixedly mounted on the top of the purification shell and is arranged corresponding to the position of the centrifugal filtering mechanism; A mixing time confirmation mechanism is fixedly mounted on the outer wall of the purification shell; The PLC controller is fixedly mounted on the outer wall of the purification shell and is electrically connected to the weighing feedback mechanism, the telescopic connection mechanism, the extraction solvent mixing and adding mechanism, the material viscosity detection feedback mechanism, the anti-blocking cleaning mechanism and the mixing time confirmation mechanism.

[0006] In the above-mentioned liquid purification device for food testing, the centrifugal filtration mechanism includes a centrifugal filter cartridge rotatably connected to the bottom of the inner wall of the purification shell, the cylinder wall of the centrifugal filter cartridge is provided with a plurality of liquid outlet holes, and a centrifuge for driving the centrifugal filter cartridge to rotate is fixedly installed at the bottom end of the purification shell.

[0007] In the above-mentioned liquid purification device for food detection, the weighing feedback mechanism includes a fixed frame fixedly inserted into the upper end of the purification shell, a storage shell is arranged in the fixed frame, a plurality of cross plates are symmetrically fixedly connected to the inner wall of the fixed frame, a guide slide bar is fixedly connected between two upper and lower opposite cross plates, a guide block is fixedly connected to the outer wall of the storage shell for sliding engagement with the plurality of guide slide bars, a plurality of weighing springs sleeved on the outside of the guide slide bars are fixedly connected between the guide block and the cross plate, a feed hopper is arranged at the upper end of the storage shell, a feedback cavity is opened inside the fixed frame, and a feedback resistor rod is fixedly installed in the corresponding feedback cavity, a feedback conductive contact is fixedly connected to the outer wall of one of the guide blocks, the feedback conductive contact extends through the feedback cavity and is in electrical contact with the feedback resistor rod.

[0008] In the above-mentioned liquid purification device for food inspection, the telescopic connecting mechanism includes a feed pipe fixedly connected to the upper end of the centrifugal filter cartridge and the lower end of the storage shell, the feed pipe is an elastic telescopic tube, the lower end of the feed pipe is rotatably connected to the upper end of the centrifugal filter cartridge via a rotary sealing joint, the lower end tube wall of the feed pipe is fixedly sleeved with an external expansion plate, the upper end of the external expansion plate and the lower end of the storage shell are symmetrically fixedly connected with a plurality of limiting telescopic rods, and the upper end tube wall of the feed pipe is provided with an on-off valve.

[0009] In the above-mentioned liquid purification device for food inspection, the extraction solvent mixing and adding mechanism includes a feed pipe rotatably sleeved on the upper end of the storage shell, the lower end of the feed pipe is fixedly connected to a buffer tray, the lower end of the buffer tray is symmetrically fixedly connected to a plurality of stirring drums, the upper end of the storage shell is fixedly provided with a motor drive assembly for driving the feed pipe to rotate, the upper end of the purification shell is also fixedly provided with a U-shaped support plate, the upper end of the feed pipe is rotatably connected to a supply pipe through a rotating sealing joint, a supply pipe is provided with a supply pump, and the supply pump is fixedly provided at the upper end of the U-shaped support plate.

[0010] In the above-mentioned liquid purification device for food detection, the material viscosity detection feedback mechanism includes a driving cylinder rotatably sleeved on the outside of the feed pipe through a bearing, the motor drive assembly drives the driving cylinder to rotate, the lower end tube wall of the feed pipe is fixedly sleeved with an extension ring plate, the lower end of the driving cylinder and the upper end of the extension ring plate are fixedly connected with a torsion spring sleeved on the outside of the feed pipe, the outer wall of the extension ring plate is fixedly provided with a regulating resistor rod of an annular structure, and the lower end outer wall of the driving cylinder is fixedly provided with a regulating conductive contact electrically in contact with the regulating resistor rod.

[0011] In the above-mentioned liquid purification device for food inspection, the anti-blocking cleaning mechanism includes a plurality of electric push rods symmetrically fixedly inserted into the upper end of the purification shell, and the lower movable ends of the plurality of electric push rods are fixedly connected to the same cleaning cylinder, and the cylinder wall of the cleaning cylinder is provided with a plurality of sockets arranged corresponding to the positions of the liquid outlet holes, and a dredging rod is movably inserted in the corresponding sockets, and the dredging rod is fixedly connected to a push-pull block at one end of the dredging rod located outside the cleaning cylinder, and a reset spring sleeved on the outside of the dredging rod is fixedly connected between the push-pull block and the cleaning cylinder, an insulating shell sleeved on the outside of the push-pull block is fixedly installed on the outer wall of the cleaning cylinder, and a reciprocating permanent magnet plate is fixedly connected to the side of the push-pull block away from the dredging rod, and a reciprocating electromagnetic plate arranged opposite to the reciprocating permanent magnet plate is fixedly installed on the inner wall of the insulating shell.

[0012] In the above-mentioned liquid purification device for food detection, the mixing time confirmation mechanism includes a confirmation shell, the inner wall of the confirmation shell is fixedly installed with a plurality of friction rods arranged side by side, the plurality of friction rods are slidably sleeved with the same sliding plate, the side wall of the sliding plate is fixedly installed with a force-bearing permanent magnetic plate, the inner wall of the confirmation shell is fixedly installed with a force-applying electromagnetic plate arranged opposite to the force-bearing permanent magnetic plate, the side wall of the sliding plate is also fixedly installed with a confirmation switch, the inner wall of the confirmation shell is also rotatably connected with a transmission screw arranged parallel to the friction rod, the outer wall of the confirmation shell is fixedly installed with a servo motor for driving the transmission screw to rotate, the rod wall of the transmission screw is threadedly sleeved with a pressing plate, the pressing plate is located on one side of the confirmation switch, the outer wall of the pressing plate is fixedly installed with a limit slider, and the inner wall of the confirmation shell is provided with a limit sliding groove that matches and slides with the limit slider.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the set weighing feedback mechanism and extraction solvent mixing and adding mechanism, the liquid food samples can be effectively placed, and the purification amount of the liquid food can be quickly and accurately fed back, and the addition amount of the extraction solvent can be determined based on the purification amount of the liquid food. The greater the purification amount of the liquid food, the more extraction solvent is added, thereby satisfying the extraction effect and avoiding the problem of waste caused by excessive extraction solvent.

[0014] 2. Through the set weighing feedback mechanism and mixing time confirmation mechanism, the liquid food and the extraction solvent can be quickly mixed together for reaction, which is convenient for the subsequent centrifugal filtration and purification operation, and the stirring time is determined based on the amount of liquid food to be purified. The more the amount of liquid food to be purified, the longer the mixing and stirring time is, ensuring the complete reaction of the liquid food and the extraction solvent.

[0015] 3. Through the material viscosity detection feedback mechanism and anti-clogging cleaning mechanism, the viscosity of the material sample can be automatically detected and fed back during the mixing of liquid food and extraction solvent, and the cleaning frequency of the centrifugal filter mechanism can be confirmed based on the viscosity. On the premise of ensuring the quality and efficiency of the purification of liquid food samples, it also avoids the problem that too frequent cleaning work will affect the continuous and stable progress of the purification work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view cross-sectional structural schematic diagram of the present invention; Figure 2 It is a schematic cross-sectional structural diagram of the weighing feedback mechanism of the present invention; Figure 3 It is a structural schematic diagram of the telescopic communication mechanism of the present invention; Figure 4 It is a schematic cross-sectional structural diagram of the extraction solvent mixing and adding mechanism of the present invention; Figure 5 It is a structural schematic diagram of the material viscosity detection feedback mechanism of the present invention; Figure 6 It is a schematic cross-sectional view of the anti-clogging cleaning mechanism of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the mixing time confirmation mechanism of the present invention.

[0017] In the figure: 1 purification shell, 2 centrifugal filtration mechanism, 21 centrifugal filtration cylinder, 22 liquid outlet, 23 centrifuge, 3 weighing feedback mechanism, 31 fixed frame, 32 storage shell, 33 horizontal plate, 34 guide slide bar, 35 guide block, 36 weighing spring, 37 feed hopper, 38 feedback resistor rod, 39 feedback conductive contact piece, 4 telescopic connecting mechanism, 41 feed pipe, 42 external expansion plate, 43 limit telescopic rod, 44 on-off valve, 5 extraction solvent mixing and adding mechanism, 51 feed pipe, 52 buffer plate, 53 stirring drum, 54 motor drive assembly, 55 U-shaped support plate, 56 feed pipe, 57 supply Material pump, 6 material viscosity detection feedback mechanism, 61 driving cylinder, 62 extension ring plate, 63 torsion spring, 64 regulating resistance rod, 65 regulating conductive contact, 7 anti-blocking cleaning mechanism, 71 electric push rod, 72 cleaning cylinder, 73 dredging rod, 74 push-pull block, 75 reset spring, 76 insulating shell, 77 reciprocating permanent magnet plate, 78 reciprocating electromagnetic plate, 8 mixing time confirmation mechanism, 81 confirmation shell, 82 friction rod, 83 sliding plate, 84 force permanent magnet plate, 85 force electromagnetic plate, 86 confirmation switch, 87 transmission screw, 88 servo motor, 89 pressing plate, 9 PLC controller. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 7 As shown, a liquid purification device for food testing includes a purification shell 1 and also includes: The centrifugal filtering mechanism 2 is fixedly mounted on the bottom of the inner wall of the purification shell 1. The centrifugal filtering mechanism 2 includes a centrifugal filter cartridge 21 rotatably connected to the bottom of the inner wall of the purification shell 1. The cylinder wall of the centrifugal filter cartridge 21 is provided with a plurality of liquid outlet holes 22. A centrifuge 23 for driving the centrifugal filter cartridge 21 to rotate is fixedly mounted on the bottom end of the purification shell 1.

[0020] The weighing feedback mechanism 3 is fixedly installed on the top of the purification shell 1. The weighing feedback mechanism 3 includes a fixed frame 31 fixedly inserted in the upper end of the purification shell 1, a storage shell 32 is arranged in the fixed frame 31, a plurality of cross plates 33 are symmetrically fixedly connected to the inner wall of the fixed frame 31, a guide slide 34 is fixedly connected between two upper and lower opposite cross plates 33, a guide block 35 slidably sleeved with the plurality of guide slides 34 is fixedly connected to the outer wall of the storage shell 32, a plurality of weighing springs 36 sleeved on the outside of the guide slides 34 are fixedly connected between the guide block 35 and the cross plate 33, a feeding hopper 37 is arranged at the upper end of the storage shell 32, a feedback cavity is opened inside the fixed frame 31, and a feedback resistor rod 38 is fixedly installed in the corresponding feedback cavity, a feedback conductive contact 39 is fixedly connected to the outer wall of one of the guide blocks 35, the feedback conductive contact 39 extends through the feedback cavity and is in electrical contact with the feedback resistor rod 38.

[0021] The telescopic connecting mechanism 4 is fixedly connected between the weighing feedback mechanism 3 and the centrifugal filtering mechanism 2. The telescopic connecting mechanism 4 includes a feeding pipe 41 fixedly connected to the upper end of the centrifugal filtering cylinder 21 and the lower end of the storage shell 32. The feeding pipe 41 is an elastic telescopic tube. The lower end of the feeding pipe 41 is rotatably connected to the upper end of the centrifugal filtering cylinder 21 through a rotating sealing joint. The lower end of the tube wall of the feeding pipe 41 is fixedly sleeved with an external expansion plate 42. The upper end of the external expansion plate 42 and the lower end of the storage shell 32 are symmetrically fixedly connected with a plurality of limiting telescopic rods 43. The upper end of the tube wall of the feeding pipe 41 is provided with an on-off valve 44.

[0022] The extraction solvent mixing and adding mechanism 5 is fixedly mounted on the upper end of the weighing feedback mechanism 3, and the extraction solvent mixing and adding mechanism 5 includes a feed pipe 51 rotatably sleeved on the upper end of the storage shell 32, and the lower end of the feed pipe 51 is fixedly connected to a buffer plate 52, and the lower end of the buffer plate 52 is symmetrically fixedly connected to multiple stirring drums 53, and the upper end of the storage shell 32 is fixedly mounted with a motor drive assembly 54 for driving the feed pipe 51 to rotate, and the upper end of the purification shell 1 is also fixedly mounted with a U-shaped support plate 55, and the upper end of the feed pipe 51 is rotatably connected to a supply pipe 56 through a rotating sealing joint, and a supply pump 57 is installed on the supply pipe 56, and the supply pump 57 is fixedly mounted on the upper end of the U-shaped support plate 55.

[0023] The material viscosity detection feedback mechanism 6 is installed on the extraction solvent mixing and adding mechanism 5. The material viscosity detection feedback mechanism 6 includes a driving cylinder 61 which is rotatably sleeved on the outside of the feed pipe 51 through a bearing. The motor drive assembly 54 drives the driving cylinder 61 to rotate. The lower end tube wall of the feed pipe 51 is fixedly sleeved with an extension ring plate 62. The lower end of the driving cylinder 61 and the upper end of the extension ring plate 62 are fixedly connected with a torsion spring 63 sleeved on the outside of the feed pipe 51. The outer wall of the extension ring plate 62 is fixedly installed with a regulating resistor rod 64 with an annular structure. The lower end outer wall of the driving cylinder 61 is fixedly installed with a regulating conductive contact piece 65 which is in electrical contact with the regulating resistor rod 64.

[0024] The anti-clogging cleaning mechanism 7 is fixedly mounted on the top of the purification shell 1 and is arranged corresponding to the position of the centrifugal filtering mechanism 2. The anti-clogging cleaning mechanism 7 includes multiple electric push rods 71 ​​symmetrically fixedly inserted into the upper end of the purification shell 1, and the lower movable ends of the multiple electric push rods 71 ​​are fixedly connected to the same cleaning cylinder 72. The cylinder wall of the cleaning cylinder 72 is provided with multiple sockets arranged corresponding to the positions of the liquid outlet holes 22, and a dredging rod 73 is movably inserted in the corresponding sockets. The dredging rod 73 is fixedly connected to a push-pull block 74 at one end outside the cleaning cylinder 72, and a reset spring 75 arranged outside the dredging rod 73 is fixedly connected between the push-pull block 74 and the cleaning cylinder 72. An insulating shell 76 arranged outside the push-pull block 74 is fixedly mounted on the outer wall of the cleaning cylinder 72. A reciprocating permanent magnet plate 77 is fixedly connected to the side of the push-pull block 74 away from the dredging rod 73, and a reciprocating electromagnetic plate 78 arranged opposite to the reciprocating permanent magnet plate 77 is fixedly mounted on the inner wall of the insulating shell 76.

[0025] The mixing time confirmation mechanism 8 is fixedly mounted on the outer wall of the purification shell 1. The mixing time confirmation mechanism 8 includes a confirmation shell 81. A plurality of friction rods 82 arranged side by side are fixedly mounted on the inner wall of the confirmation shell 81. The plurality of friction rods 82 are slidably sleeved with the same sliding plate 83. A force-bearing permanent magnet plate 84 is fixedly mounted on the side wall of the sliding plate 83. A force-applying electromagnetic plate 85 arranged opposite to the force-bearing permanent magnet plate 84 is fixedly mounted on the inner wall of the confirmation shell 81. A confirmation switch 86 is also fixedly mounted on the side wall of the sliding plate 83. A transmission screw 87 arranged parallel to the friction rod 82 is also rotatably connected to the inner wall of the confirmation shell 81. A servo motor 88 for driving the transmission screw 87 to rotate is fixedly mounted on the outer wall of the confirmation shell 81. A pressing plate 89 is threadedly sleeved on the rod wall of the transmission screw 87. The pressing plate 89 is located on one side of the confirmation switch 86. A limit slider is fixedly mounted on the outer wall of the pressing plate 89. A limit slide groove matching and slidingly connected with the limit slider is provided on the inner wall of the confirmation shell 81.

[0026] The PLC controller 9 is fixedly mounted on the outer wall of the purification shell 1, and is electrically connected to the weighing feedback mechanism 3, the telescopic connecting mechanism 4, the extraction solvent mixing and adding mechanism 5, the material viscosity detection feedback mechanism 6, the anti-blocking cleaning mechanism 7 and the mixing time confirmation mechanism 8 respectively.

[0027] The operating principle of the present invention is described as follows: the liquid food to be purified is fed into the storage shell 32 through the feed hopper 37. Due to the addition of the liquid food, the weight of the storage shell 32 changes, so that the storage shell 32 and the fixed frame 31 move relative to each other through the sliding sleeve action of the guide slide bar 34 and the guide block 35 to overcome the elastic force of the weighing spring 36. Specifically, the more liquid food is added, the more the weight of the storage shell 32 increases, so that the storage shell 32 moves downward relative to a greater distance, and then the feedback conductive contact 39 slides on the feedback resistor rod 38. The larger the access resistance value of the feedback resistor rod 38 is; After the liquid food is placed stably, the PLC controller 9 determines the working power of the feed pump 57 based on the resistance signal fed back by the feedback resistor rod 38. Specifically, the more liquid food is added, the smaller the access resistance of the feedback resistor rod 38 is, and the smaller the resistance signal fed back to the PLC controller 9 is, so that the PLC controller 9 controls the feed pump 57 to work at a higher power. When adding the extraction solvent, the PLC controller 9 controls the feed pump 57 to work for 5s. The feed pump 57 cooperates with the feed pipe 56 to transport the extraction solvent in the external extraction solvent storage tank to the storage shell 32 through the feed pipe 51, the buffer plate 52 and the mixing drum 53. In the fixed feeding time of 5s, because the more liquid food is added, the more the feed pump 57 works at a higher power, and more extraction solvent will be transported to cooperate with the liquid food for purification operation, and the amount of extraction solvent added can be automatically adjusted to ensure that the amount of extraction solvent is within an appropriate range. Similarly, after the liquid food is placed in the material storage shell 32, the feedback conductive contact 39 is stabilized relative to the feedback resistor rod 38, and the PLC controller 9 controls the power supply device to supply power to the force electromagnetic plate 85. The force electromagnetic plate 85 is energized to generate the same magnetism as the force-bearing permanent magnet plate 84, thereby driving the sliding plate 83 to slide along the friction rod 82, and the feedback conductive contact 39 and the feedback resistor rod 38 are connected in series to the power supply circuit of the force electromagnetic plate 85. When the amount of liquid food added increases, the access resistance of the feedback resistor rod 38 becomes smaller, and the power supply current of the force electromagnetic plate 85 becomes larger, thereby making the sliding distance of the sliding plate 83 larger, and making the confirmation switch 86 on the side wall of the sliding plate 83 The distance from the pressing plate 89 is increased. This power supply process of the sliding plate 83 is maintained for 3s after the liquid food is added stably, and then the power supply to the force electromagnetic plate 85 is cut off, so that the position of the sliding plate 83 is fixed; After the extraction solvent is also added into the material storage shell 32, the PLC controller 9 controls the motor drive assembly 54 and the servo motor 88 to work synchronously, the motor drive assembly 54 drives the drive cylinder 61 to rotate, the drive cylinder 61 cooperates with the torsion spring 63 to drive the feed pipe 51 to rotate, and the feed pipe 51 drives the stirring cylinder 53 to rotate in the material storage shell 32 through the buffer plate 52, so as to achieve rapid mixing and stirring of the liquid food and the extraction solvent, and in the stirring process, the servo motor 88 drives the transmission screw 87 to rotate synchronously, and the threaded sleeve effect of the transmission screw 87 and the pressing plate 89 makes the pressing plate 89 rotate. 9 moves in the confirmation shell 81 until the pressing plate 89 presses on the confirmation switch 86. When the confirmation switch 86 is pressed and triggered, the PLC controller 9 controls the motor drive assembly 54 to stop the action, thereby completing the effective mixing of the liquid food and the extraction solvent. At this time, the PLC controller 9 controls the on-off valve 44 on the feed pipe 41 to open, so that the mixed sample in the storage shell 32 is transferred to the centrifugal filter cartridge 21. The PLC controller 9 controls the centrifuge 23 to operate, and the centrifuge 23 drives the centrifugal filter cartridge 21 to rotate at a high speed to complete the centrifugal purification of the sample. When the liquid food and the extraction solvent are mixed and stirred, the greater the viscosity of the stirring material, the driving cylinder 61 needs to make the torsion spring 63 produce a greater deformation to provide sufficient supporting force to drive the feed tube 51 to rotate synchronously, thereby making the displacement of the driving cylinder 61 relative to the extension ring plate 62 larger, thereby making the sliding distance of the regulating conductive contact 65 on the regulating resistor rod 64 larger, thereby making the access resistance of the regulating resistor rod 64 smaller, and the access resistance signal of the regulating resistor rod 64 is fed back to the PLC controller 9. Specifically, the smaller the access resistance of the regulating resistor rod 64, the higher the frequency of the PLC controller 9 controlling the anti-blocking cleaning mechanism 7 to work; When the anti-clogging cleaning mechanism 7 is working, the PLC controller 9 first controls the electric push rod 71 to push the cleaning cylinder 72 downward, so that the cleaning cylinder 72 is covered outside the centrifugal filter cylinder 21, and the unblocking rod 73 is aligned with the liquid outlet 22 outside the centrifugal filter cylinder 21. The PLC controller 9 then controls the power supply equipment to supply alternating current to the reciprocating electromagnetic plate 78, so that the magnetism of the reciprocating electromagnetic plate 78 changes back and forth. The reciprocating electromagnetic plate 78 cooperates with the reciprocating permanent magnet plate 77 to drive the unblocking rod 73 to move back and forth, thereby quickly pounding out and unblocking the material blocked in the liquid outlet 22 outside the centrifugal filter cylinder 21, thereby avoiding the problem of clogging of the centrifugal filter cylinder 21 affecting the purification quality and efficiency.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid purification device for food testing, comprising a purification shell (1), characterized in that: Also includes: A centrifugal filtering mechanism (2) is fixedly mounted on the bottom of the inner wall of the purification shell (1); A weighing feedback mechanism (3) is fixedly mounted on the top of the purification shell (1); A telescopic communication mechanism (4) fixedly connected between the weighing feedback mechanism (3) and the centrifugal filtering mechanism (2); An extraction solvent mixing and adding mechanism (5) is fixedly mounted on the upper end of the weighing feedback mechanism (3); A material viscosity detection feedback mechanism (6) is installed on the extraction solvent mixing and adding mechanism (5); An anti-clogging cleaning mechanism (7) is fixedly mounted on the top of the purification shell (1) and is arranged corresponding to the position of the centrifugal filtering mechanism (2); A mixing time confirmation mechanism (8) is fixedly mounted on the outer wall of the purification shell (1); The PLC controller (9) is fixedly mounted on the outer wall of the purification shell (1) and is electrically connected to the weighing feedback mechanism (3), the telescopic connection mechanism (4), the extraction solvent mixing and adding mechanism (5), the material viscosity detection feedback mechanism (6), the anti-blocking cleaning mechanism (7) and the mixing time confirmation mechanism (8).

2. A liquid purification device for food testing according to claim 1, characterized in that: The centrifugal filtration mechanism (2) comprises a centrifugal filtration cartridge (21) rotatably connected to the bottom of the inner wall of the purification shell (1), the cartridge wall of the centrifugal filtration cartridge (21) being provided with a plurality of liquid outlet holes (22), and a centrifuge (23) for driving the centrifugal filtration cartridge (21) to rotate is fixedly mounted at the bottom end of the purification shell (1).

3. A liquid purification device for food testing according to claim 2, characterized in that: The weighing feedback mechanism (3) comprises a fixed frame (31) fixedly inserted into the upper end of the purification shell (1), a material storage shell (32) is arranged in the fixed frame (31), a plurality of transverse plates (33) are fixedly connected to the inner wall of the fixed frame (31) symmetrically up and down, a guide slide bar (34) is fixedly connected between two transverse plates (33) opposite to each other up and down, and a guide block (35) slidably sleeved with the plurality of guide slide bars (34) is fixedly connected to the outer wall of the material storage shell (32), and the guide block (35) and A plurality of weighing springs (36) sleeved outside the guide slide bar (34) are fixedly connected between the transverse plates (33); a feeding hopper (37) is provided at the upper end of the material storage shell (32); a feedback cavity is provided inside the fixed frame (31), and a feedback resistor rod (38) is fixedly installed in the corresponding feedback cavity; a feedback conductive contact piece (39) is fixedly connected to the outer wall of one of the guide blocks (35); the feedback conductive contact piece (39) extends through the feedback cavity and is in electrical contact with the feedback resistor rod (38).

4. A liquid purification device for food testing according to claim 3, characterized in that: The telescopic communication mechanism (4) comprises a feed pipe (41) fixedly connected to the upper end of the centrifugal filter cartridge (21) and the lower end of the material storage shell (32); the feed pipe (41) is an elastic telescopic pipe; the lower end of the feed pipe (41) is rotatably connected to the upper end of the centrifugal filter cartridge (21) via a rotary sealing joint; an outer expansion plate (42) is fixedly sleeved on the lower end of the feed pipe (41); a plurality of limit telescopic rods (43) are symmetrically fixedly connected to the upper end of the outer expansion plate (42) and the lower end of the material storage shell (32); and an on-off valve (44) is installed on the upper end of the feed pipe (41).

5. A liquid purification device for food testing according to claim 3, characterized in that: The extraction solvent mixing and adding mechanism (5) comprises a feed pipe (51) rotatably sleeved on the upper end of the material storage shell (32); the lower end of the feed pipe (51) is fixedly connected to a buffer plate (52); the lower end of the buffer plate (52) is symmetrically fixedly connected to a plurality of stirring drums (53); a motor drive assembly (54) for driving the feed pipe (51) to rotate is fixedly mounted on the upper end of the material storage shell (32); a U-shaped support plate (55) is also fixedly mounted on the upper end of the purification shell (1); the upper end of the feed pipe (51) is rotatably connected to a supply pipe (56) via a rotary sealing joint; a supply pipe (56) is mounted with a supply pump (57); and the supply pump (57) is fixedly mounted on the upper end of the U-shaped support plate (55).

6. A liquid purification device for food testing according to claim 5, characterized in that: The material viscosity detection feedback mechanism (6) comprises a driving cylinder (61) rotatably sleeved on the outside of the feed pipe (51) via a bearing, the motor drive assembly (54) drives the driving cylinder (61) to rotate, an extension ring plate (62) is fixedly sleeved on the lower end tube wall of the feed pipe (51), the lower end of the driving cylinder (61) and the upper end of the extension ring plate (62) are fixedly connected with a torsion spring (63) sleeved on the outside of the feed pipe (51), the outer wall of the extension ring plate (62) is fixedly mounted with a regulating resistor rod (64) of an annular structure, and the lower end outer wall of the driving cylinder (61) is fixedly mounted with a regulating conductive contact piece (65) in electrical contact with the regulating resistor rod (64).

7. A liquid purification device for food testing according to claim 2, characterized in that: The anti-clogging cleaning mechanism (7) comprises a plurality of electric push rods (71) symmetrically fixedly inserted into the upper end of the purification shell (1), the lower movable ends of the plurality of electric push rods (71) are fixedly connected to the same cleaning cylinder (72), the cylinder wall of the cleaning cylinder (72) is provided with a plurality of plug holes corresponding to the positions of the liquid outlet holes (22), and a dredging rod (73) is movably inserted into the corresponding plug holes, and one end of the dredging rod (73) located outside the cleaning cylinder (72) is fixedly connected to a push-pull block (7 4), a return spring (75) sleeved outside the dredging rod (73) is fixedly connected between the push-pull block (74) and the cleaning cylinder (72), an insulating shell (76) sleeved outside the push-pull block (74) is fixedly mounted on the outer wall of the cleaning cylinder (72), a reciprocating permanent magnet plate (77) is fixedly connected to the side of the push-pull block (74) away from the dredging rod (73), and a reciprocating electromagnetic plate (78) arranged opposite to the reciprocating permanent magnet plate (77) is fixedly mounted on the inner wall of the insulating shell (76).

8. A liquid purification device for food testing according to claim 1, characterized in that: The mixing time confirmation mechanism (8) comprises a confirmation shell (81), a plurality of friction rods (82) arranged side by side are fixedly mounted on the inner wall of the confirmation shell (81), a same sliding plate (83) is slidably sleeved on the outer side of the plurality of friction rods (82), a force-bearing permanent magnetic plate (84) is fixedly mounted on the side wall of the sliding plate (83), a force-applying electromagnetic plate (85) arranged opposite to the force-bearing permanent magnetic plate (84) is fixedly mounted on the inner wall of the confirmation shell (81), and a confirmation switch (86) is also fixedly mounted on the side wall of the sliding plate (83). The inner wall of the confirmation shell (81) is also rotatably connected to a transmission screw (87) arranged in parallel with the friction rod (82); the outer wall of the confirmation shell (81) is fixedly provided with a servo motor (88) for driving the transmission screw (87) to rotate; the rod wall of the transmission screw (87) is threadedly sleeved with a pressing plate (89); the pressing plate (89) is located on one side of the confirmation switch (86); a limit slider is fixedly provided on the outer wall of the pressing plate (89); and a limit slide groove matching and slidingly connected with the limit slider is provided on the inner wall of the confirmation shell (81).

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