Heavy metal residue detection device for fresh water product

Abstract

The invention relates to the technical field of heavy metal residue detection, and provides a fresh water product heavy metal residue detection device which comprises a fixed base, a sampling assembly, a processing assembly and a detection assembly, the sampling assembly comprises a conveying belt installed at the top of the fixed base, and a driving motor is installed in the conveying belt; the output end of the driving motor is fixedly connected with a driving rotating shaft through a coupling, the driving rotating shaft is coaxially arranged, a driving wheel is arranged in the conveying belt, the driving wheel is arranged on the peripheral surface of the driving rotating shaft in a sleeving manner, and a rotating wheel is fixedly arranged on the peripheral surface of the driving rotating shaft in a sleeving manner. Through cooperation of the conveying belt and the sampling device, the automatic and continuous sampling process is achieved, the sampling efficiency is improved, a cleaning mechanism is arranged on the surface of the conveying belt, residues are effectively reduced, cross contamination is avoided, and the accuracy of a detection result is guaranteed through the synergistic effect of the protruding columns, the limiting blocks, the cleaning brushes and other components.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy metal residue detection, and in particular to a device for detecting heavy metal residues in freshwater products. Background Art

[0002] At present, with the acceleration of industrialization, water pollution is becoming increasingly serious, especially heavy metal pollution. Heavy metals such as lead, mercury, cadmium, and chromium are highly toxic, difficult to degrade, and easily accumulate in organisms, posing a serious threat to the environment and human health. As an important part of people's daily diet, the problem of heavy metal residues in freshwater products has attracted much attention.

[0003] The authorization announcement in the prior art is: CN 216646452 U, and its name is: A food heavy metal residue detection device, which belongs to the field of food detection technology. A food heavy metal residue detection device includes a workbench and a detection instrument. A mounting plate is provided at the upper end of the workbench, and a sampling seat is fixedly connected to the upper end of the mounting plate. A liquid storage chamber, a sampling slot and a transmission chamber are respectively provided inside the sampling seat, and a plurality of sieving holes connected to the liquid storage chamber are provided on the inner wall of the sampling slot.

[0004] Although the patent sets a structure to squeeze the pulp to separate the pulp and juice, when it comes to the detection of heavy metal residues in freshwater products, especially fish, because the heavy metals in fish are mainly concentrated in the head and internal organs, squeezing cannot effectively release the heavy metals in the fish, and there is a problem of accurate detection effect;

[0005] In addition, the device needs to be manually cleaned after each use, and cannot be continuously sampled and tested, resulting in low detection efficiency. Summary of the invention

[0006] The present invention provides a device for detecting heavy metal residues in freshwater products, which solves the problems of poor accuracy and low detection efficiency in the related art.

[0007] The technical solution of the present invention is as follows: To achieve the above-mentioned purpose, the present invention provides the following technical solution: A device for detecting heavy metal residues in freshwater products, comprising a fixed base, a sampling component, a processing component and a detection component;

[0008] The sampling assembly includes a conveyor belt installed on the top of the fixed base, a driving motor is installed inside the conveyor belt, the output end of the driving motor is fixedly connected to a coaxially arranged driving shaft through a coupling, a driving wheel is arranged inside the conveyor belt, the driving wheel is sleeved on the outer circumference of the driving shaft, a rotating wheel is fixedly sleeved on the outer circumference of the driving shaft, a convex column is fixedly connected to one side of the rotating wheel, a driving shaft and a passive shaft are rotatably installed inside the conveyor belt respectively, a driving gear is fixedly sleeved on the outer circumference of the driving shaft, a passive gear is fixedly sleeved on the outer circumference of the passive shaft, the driving gear and the passive gear are meshingly connected, a limiting block is fixedly sleeved on the outer circumference of the driving shaft, a limiting groove is arranged inside the limiting block, the convex column is slidably connected to the inside of the limiting groove, and cleaning brushes are sleeved on the outer circumferences of the driving shaft and the passive shaft;

[0009] The processing assembly comprises two symmetrically arranged fixed brackets fixedly connected to the top of the fixed base, a grinding barrel is fixedly connected between the two fixed brackets, a grinding motor is installed on the top of the grinding barrel, an output end of the grinding motor is fixedly connected to a coaxially arranged crushing shaft through a coupling, a plurality of symmetrically arranged crushing blades are fixedly sleeved on the outer peripheral surface of the crushing shaft, and an opening and closing mechanism is installed at the bottom of the grinding barrel;

[0010] The detection component includes an annular placement plate rotatably mounted on the top of the fixed base, a servo motor is arranged at the bottom of the annular placement plate, the output end of the servo motor is fixedly connected to the inside of the annular placement plate through a coupling, and a plurality of placement racks evenly distributed in an annular array are fixedly connected to the top of the annular placement plate, and a detection cup is arranged inside the placement rack.

[0011] Preferably, the sampling assembly also includes two symmetrically arranged columns fixedly connected to the top of the fixed base, a transverse slide rail is installed between the two columns, a vertical slide rail is installed on one side of the moving end of the transverse slide rail, and a sampler is installed on the moving end of the vertical slide rail. The sampler is provided to move in the direction of the conveyor belt, thereby ensuring sampling of materials on the top of the conveyor belt.

[0012] Preferably, a water pipe is provided inside the grinding barrel, and a plurality of water outlets evenly distributed in a circular array are provided at the bottom of the water pipe, and the water outlets are located inside the grinding barrel;

[0013] The grinding barrel is respectively provided with a feed port and a discharge port, the feed port and the discharge port are both connected with the interior of the grinding barrel, the discharge port is provided with a ball valve, and a waste barrel is provided on the top of the fixed base, the discharge port is connected with the waste barrel, and a water outlet is provided inside the grinding barrel to clean the inside of the grinding barrel after each grinding is completed, so as to prevent the residue from the last grinding from remaining and causing deviations in subsequent detection. In addition, the setting of the ball valve can control the time of each water discharge, so as to prevent the material from directly entering the interior of the waste box through the discharge port during the grinding process.

[0014] Preferably, the opening and closing mechanism includes a fixed plate fixedly connected to the inside of the grinding barrel, the inside of the fixed plate is provided with a plurality of straight grooves evenly distributed in a circular array, a long rod is slidably connected to the inside of the straight groove, a reset spring is welded between the long rod and the side wall of the straight groove, a closing block is fixedly connected to the top of the long rod, a sliding block is fixedly connected to the top of the closing block, a rotating plate is rotatably installed inside the grinding barrel, the inside of the rotating plate is provided with a plurality of sliding grooves evenly distributed in a circular array, the sliding block is slidably connected to the inside of the sliding groove, and the reset spring can be set so that the closing block can be reset and closed under the action of the reset spring each time the two gears are separated, thereby preventing waste water from entering the inside of the detection cup during the cleaning process.

[0015] Preferably, an opening and closing gear is fixedly sleeved on the outer circumference of the rotating disk, a fixed disk is fixedly connected to the top of the annular placement disk, a plurality of fixed gears evenly distributed in an annular array are fixedly connected to one side of the fixed disk, the fixed gears correspond to the placement racks one by one, and the opening and closing gears are meshedly connected to the fixed gears;

[0016] A microwave generator 1 and a microwave generator 2 are respectively arranged on the top of the fixed base, and the microwave generator 1 and the microwave generator 2 are symmetrically arranged. By opening the microwave generator 1 and the microwave generator 2, when the detection cup reaches between the microwave generator 1 and the microwave generator 2, the fish meat inside can be directly digested without manual removal, thereby achieving the effect of automatic digestion.

[0017] Preferably, two symmetrically arranged columns 2 are fixedly connected to the top of the fixed base, a horizontal slide rail 2 is installed between the two columns 2, a vertical slide rail 2 is installed on the movable end of the horizontal slide rail 2, and a detection head is installed on the movable end of the vertical slide rail 2. The provision of a followable detection head makes it more flexible during detection and also facilitates the inspection and maintenance of the detection head after the detection is completed.

[0018] The working principle and beneficial effects of the present invention are:

[0019] 1. The present invention realizes an automated and continuous sampling process through the arrangement of the sampling assembly and other structures, and the cooperation between the conveyor belt and the sampler, thereby improving the sampling efficiency. The cleaning mechanism on the surface of the conveyor belt, through the synergistic effect of the convex column, the limit block, the cleaning brush and other components, effectively reduces the residue, avoids cross contamination, and ensures the accuracy of the test results.

[0020] 2. The present invention can quickly and thoroughly crush fish meat through the arrangement of processing components and other structures, the design of grinding barrel and crushing blade, and provide uniform samples for subsequent testing. The annular placement plate and closing block mechanism driven by the servo motor realize the automatic cupping of the ground samples, improve work efficiency, and reduce manual intervention.

[0021] 3. The present invention sets up structures such as detection components and a cleaning mechanism for the grinding barrel, including components such as a water pipe, a water outlet, and a waste barrel, so that the grinding barrel can be cleaned promptly and effectively after each use, thereby maintaining the hygienic state of the equipment. The design of the reset spring enables the grinding barrel to be automatically closed after cleaning, thereby avoiding external contamination and facilitating the maintenance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a side sectional view of the present invention;

[0025] Figure 3 It is a partial structural schematic diagram of the present invention;

[0026] Figure 4 It is a front cross-sectional view of the present invention;

[0027] Figure 5 It is a schematic diagram of the conveyor belt structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the opening and closing mechanism structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the fixed disk structure of the present invention;

[0030] Figure 8 It is a schematic diagram of the closed block structure of the present invention.

[0031] In the figure: 1, fixed base; 2, sampling assembly; 21, horizontal slide rail 1; 22, vertical slide rail 1; 23, sampler; 24, conveyor belt; 25, driving shaft; 26, boss; 27, limit groove; 28, limit block; 29, driving shaft; 210, driven shaft; 211, cleaning brush; 212, driven gear; 213, driving gear;

[0032] 3. Processing assembly; 301. Fixed bracket; 302. Grinding barrel; 303. Grinding motor; 304. Crushing shaft; 305. Water pipe; 306. Water outlet; 307. Crushing blade; 308. Feed inlet; 309. Discharge outlet; 310. Waste barrel; 311. Opening and closing mechanism; 312. Opening and closing gear; 313. Fixed gear; 314. Fixed disk; 315. Closing block; 316. Sliding block; 317. Sliding groove; 318. Return spring; 319. Straight groove; 320. Long rod; 321. Rotating disk;

[0033] 4. Detection assembly; 41. Ring placement plate; 42. Placement rack; 43. Detection cup; 44. Second column; 45. Second horizontal slide rail; 46. Second vertical slide rail; 47. Detection head. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 8 As shown, this embodiment proposes a heavy metal residue detection device for freshwater products, including a fixed base 1, a sampling component 2, a processing component 3 and a detection component 4;

[0036] The sampling assembly 2 includes a conveyor belt 24 installed on the top of the fixed base 1, a driving motor is installed inside the conveyor belt 24, and the output end of the driving motor is fixedly connected to a coaxially arranged driving shaft 25 through a coupling, a driving wheel is arranged inside the conveyor belt 24, and the driving wheel is sleeved on the outer peripheral surface of the driving shaft 25, and a rotating wheel is fixedly sleeved on the outer peripheral surface of the driving shaft 25, and a boss 26 is fixedly connected on one side of the rotating wheel, and a driving shaft 29 and a passive shaft 210 are rotatably installed inside the conveyor belt 24 respectively, a driving gear 213 is fixedly sleeved on the outer peripheral surface of the driving shaft 29, and a passive gear 212 is fixedly sleeved on the outer peripheral surface of the passive shaft 210, and the driving gear 213 and the passive gear 212 are meshed and connected, and a limit block 28 is fixedly sleeved on the outer peripheral surface of the driving shaft 29, and a limit groove 27 is provided inside the limit block 28, and the boss 26 is slidably connected inside the limit groove 27, and a cleaning brush 211 is sleeved on the outer peripheral surfaces of the driving shaft 29 and the passive shaft 210;

[0037] The processing assembly 3 includes two symmetrically arranged fixed brackets 301 fixedly connected to the top of the fixed base 1, a grinding barrel 302 is fixedly connected between the two fixed brackets 301, a grinding motor 303 is installed on the top of the grinding barrel 302, an output end of the grinding motor 303 is fixedly connected to a coaxially arranged crushing shaft 304 through a coupling, a plurality of symmetrically arranged crushing blades 307 are fixedly sleeved on the outer peripheral surface of the crushing shaft 304, and an opening and closing mechanism 311 is installed at the bottom of the grinding barrel 302;

[0038] The detection component 4 includes an annular placement plate 41 rotatably mounted on the top of the fixed base 1, a servo motor is arranged at the bottom of the annular placement plate 41, the output end of the servo motor is fixedly connected to the inside of the annular placement plate 41 through a coupling, and a plurality of placement racks 42 evenly distributed in a circular array are fixedly connected to the top of the annular placement plate 41, and a detection cup 43 is arranged inside the placement rack 42.

[0039] like Figures 1 to 8 As shown, the sampling assembly 2 also includes two symmetrically arranged columns fixedly connected to the top of the fixed base 1, a horizontal slide rail 21 is installed between the two columns, a vertical slide rail 22 is installed on one side of the moving end of the horizontal slide rail 21, and a sampler 23 is installed on the moving end of the vertical slide rail 22. The sampler 23 is provided to move in the direction of the conveyor belt 24, so as to ensure that the material on the top of the conveyor belt 24 can be sampled.

[0040] like Figures 1 to 8 As shown, a water pipe 305 is disposed inside the grinding barrel 302, and a plurality of water outlets 306 evenly distributed in a circular array are disposed at the bottom of the water pipe 305, and the water outlets 306 are located inside the grinding barrel 302;

[0041] The grinding barrel 302 is respectively provided with a feed port 308 and a discharge port 309, which are both connected to the interior of the grinding barrel 302. A ball valve is provided on the discharge port 309. A waste barrel 310 is provided on the top of the fixed base 1, and the discharge port 309 is connected to the waste barrel 310. A water outlet is provided inside the grinding barrel 302 to clean the interior of the grinding barrel 302 after each grinding is completed, so as to prevent the residue from the last grinding from causing deviations in subsequent detection. In addition, the setting of the ball valve can control the time of each water discharge, so as to prevent the material from directly entering the interior of the waste box through the discharge port 309 during the grinding process.

[0042] like Figures 1 to 8 As shown, the opening and closing mechanism 311 includes a fixed plate 314 fixedly connected to the inside of the grinding barrel 302, and a plurality of straight grooves 319 uniformly distributed in a circular array are opened inside the fixed plate 314, and a long rod 320 is slidably connected inside the straight groove 319, and a return spring 318 is welded between the long rod 320 and the side wall of the straight groove 319, and a closing block 315 is fixedly connected to the top of the long rod 320, and a slider 316 is fixedly connected to the top of the closing block 315, and a rotating plate 321 is rotatably installed inside the grinding barrel 302, and a plurality of sliding grooves 317 uniformly distributed in a circular array are opened inside the rotating plate 321, and the slider 316 is slidably connected inside the sliding groove 317. Under the setting of the return spring 318, the closing block 315 can be reset and closed under the action of the return spring 318 every time the two gears are separated, so as to prevent waste water from entering the inside of the detection cup 43 during the cleaning process.

[0043] like Figures 1 to 8 As shown, an opening and closing gear 312 is fixedly sleeved on the outer circumference of the rotating disk 321, a fixed disk 314 is fixedly connected to the top of the annular placement disk 41, and a plurality of fixed gears 313 evenly distributed in an annular array are fixedly connected to one side of the fixed disk 314, the fixed gears 313 and the placement racks 42 correspond one to one, and the opening and closing gears 312 and the fixed gears 313 are meshed and connected;

[0044] Microwave generator 1 and microwave generator 2 are respectively provided on the top of the fixed base 1, and microwave generator 1 and microwave generator 2 are arranged symmetrically. By opening microwave generator 1 and microwave generator 2, when the detection cup 43 reaches between microwave generator 1 and microwave generator 2, the fish meat inside can be directly digested without manual removal, thereby achieving the effect of automatic digestion.

[0045] like Figures 1 to 8As shown, two symmetrically arranged columns 44 are fixedly connected to the top of the fixed base 1, and a horizontal slide rail 45 is installed between the two columns 44. A vertical slide rail 46 is installed on the moving end of the horizontal slide rail 45, and a detection head 47 is installed on the moving end of the vertical slide rail 46. The provision of a followable detection head 47 makes it more flexible during detection and also facilitates the inspection and maintenance of the detection head 47 after the detection is completed.

[0046] In this embodiment, the freshwater product to be tested is first placed on the top of the conveyor belt 24, and then the conveyor belt 24 is started. The conveyor belt 24 will convey the items to the bottom of the sampler 23. At this time, the sampler 23 is aligned with the position where sampling is required by controlling the horizontal slide rail 21, and then the sampler is driven to move downward by starting the vertical slide rail 22 to sample the items at the bottom (it should be noted that the sampler 23 is an existing product that can be obtained from the market. The fish head is separated by applying downward pressure, and the fish meat is fixed by evacuating the inside. This is a prior art and will not be described in detail here). After the sampling is completed, the conveyor belt 24 continues to move to sample the next item. In this process, the rotating shaft 2 is driven 5 will drive the boss 26 to rotate, and when the boss 26 rotates, it will drive the limit block 28 to swing back and forth with the driving shaft 29 as the axis, and the driving shaft 29 will drive the cleaning brush 211 to clean the surface of the conveyor belt 24. At the same time, the rotation of the driving shaft 29 will drive the driving gear 213 to rotate together, and the driving gear 213 drives the passive gear 212 to rotate, and the passive gear 212 drives the passive shaft 210 to rotate, and the passive shaft 210 drives another cleaning brush 211 to swing back and forth to clean the surface. Because the two shafts are connected by gears, they will rotate in opposite directions, thereby achieving a reciprocating cleaning effect. By cleaning the surface of the conveyor belt 24, residues can be reduced to prevent cross contamination from affecting the accuracy of detection;

[0047] Furthermore, after the sampling is completed, the sampler 23 will be driven by the transverse conveyor belt 24 until the bottom of the sampler 23 is aligned with the feed port 308. At this time, the sampler 23 puts the fish meat inside into the grinding barrel 302, starts the grinding motor 303, and drives the crushing blade 307 to crush the fish meat inside. After the crushing is completed, the grinding motor 303 is turned off, and the servo motor is started. The servo motor drives the annular placement plate 41 to rotate. The rotation of the annular placement plate 41 drives the fixed gear 313 to rotate, and is meshed with the opening and closing gear inside the grinding barrel 302, thereby driving the rotating plate 321 to rotate, and finally driving all the closing blocks 315 to move outward along the direction of the straight groove 319 to achieve the opening and closing effect, so that the crushed fish meat is input into the interior of the detection cup 43;

[0048] Furthermore, after the cupping is completed, the servo motor is started to separate the fixed gear 313 and the opening and closing gear 312. At this time, due to the setting of the reset spring 318, all the sliders 316 will be reset, so that the grinding barrel 302 is closed. At this time, water is transported to the inside of the grinding barrel 302 through the water pipe 305 and the water outlet 306 to clean it. After the cleaning is completed, the ball valve on the top of the discharge port 309 is opened, and the sewage inside will enter the waste barrel 310 through the discharge port 309, and the cleaning of the grinding barrel 302 is completed.

[0049] Finally, after the detection cup 43 moves to between microwave generator 1 322 and microwave generator 2 323 as the annular placement plate 41 rotates, the two microwave generators will be started to digest the fish meat inside the detection cup 43 (it should be noted that the microwave generator can be selected, GMP150 microwave generator, or any other generator that can achieve this effect. This model is a commercially available product and will not be described in detail here) to facilitate subsequent testing. After the digestion is completed, the servo motor continues to start and moves the detection cup 43 to the bottom of the detection head 47. The detection head 47 (it should be noted that the detection head 47 uses an electrically cooled Si-pin detector to detect the digested liquid) moves downward through the action of the vertical slide rail 2 46 to detect the heavy metals inside.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting heavy metal residues in freshwater products, characterized in that: It comprises a fixed base (1), a sampling component (2), a processing component (3) and a detection component (4); The sampling assembly (2) comprises a conveyor belt (24) mounted on the top of the fixed base (1), a driving motor is mounted inside the conveyor belt (24), an output end of the driving motor is fixedly connected to a coaxially arranged driving shaft (25) through a coupling, a driving wheel is mounted inside the conveyor belt (24), the driving wheel is sleeved on the outer peripheral surface of the driving shaft (25), a rotating wheel is fixedly sleeved on the outer peripheral surface of the driving shaft (25), a convex column (26) is fixedly connected to one side of the rotating wheel, and a driving shaft (29) and a passive shaft (29) are rotatably mounted inside the conveyor belt (24). 210), a driving gear (213) is fixedly sleeved on the outer circumference of the driving shaft (29), a passive gear (212) is fixedly sleeved on the outer circumference of the passive shaft (210), the driving gear (213) and the passive gear (212) are meshingly connected, a limiting block (28) is fixedly sleeved on the outer circumference of the driving shaft (29), a limiting groove (27) is provided inside the limiting block (28), the convex column (26) is slidably connected inside the limiting groove (27), and cleaning brushes (211) are sleeved on the outer circumferences of the driving shaft (29) and the passive shaft (210); The processing assembly (3) comprises two symmetrically arranged fixed brackets (301) fixedly connected to the top of the fixed base (1); a grinding barrel (302) is fixedly connected between the two fixed brackets (301); a grinding motor (303) is installed on the top of the grinding barrel (302); an output end of the grinding motor (303) is fixedly connected to a coaxially arranged crushing shaft (304) via a coupling; a plurality of symmetrically arranged crushing blades (307) are fixedly sleeved on the outer peripheral surface of the crushing shaft (304); and an opening and closing mechanism (311) is installed at the bottom of the grinding barrel (302); The detection assembly (4) comprises an annular placement plate (41) rotatably mounted on the top of the fixed base (1); a servo motor is arranged at the bottom of the annular placement plate (41); an output end of the servo motor is fixedly connected to the inside of the annular placement plate (41) via a coupling; a plurality of placement racks (42) evenly distributed in an annular array are fixedly connected to the top of the annular placement plate (41); and a detection cup (43) is arranged inside the placement rack (42).

2. A freshwater product heavy metal residue detection device according to claim 1, characterized in that: The sampling assembly (2) further comprises two symmetrically arranged columns fixedly connected to the top of the fixed base (1), a horizontal slide rail (21) being installed between the two columns, a vertical slide rail (22) being installed on one side of the movable end of the horizontal slide rail (21), and a sampler (23) being installed on the movable end of the vertical slide rail (22).

3. A freshwater product heavy metal residue detection device according to claim 2, characterized in that: A water pipe (305) is provided inside the grinding barrel (302), and a plurality of water outlets (306) evenly distributed in a circular array are provided at the bottom of the water pipe (305), and the water outlets (306) are located inside the grinding barrel (302); The grinding barrel (302) is provided with a feed port (308) and a discharge port (309), respectively; the feed port (308) and the discharge port (309) are both connected to the interior of the grinding barrel (302); a ball valve is provided on the discharge port (309); a waste barrel (310) is provided on the top of the fixed base (1); the discharge port (309) is connected to the waste barrel (310).

4. A freshwater product heavy metal residue detection device according to claim 3, characterized in that: The opening and closing mechanism (311) comprises a fixed plate (314) fixedly connected to the inside of the grinding barrel (302); a plurality of straight grooves (319) evenly distributed in a circular array are provided inside the fixed plate (314); a long rod (320) is slidably connected inside the straight groove (319); a return spring (318) is welded between the long rod (320) and the side wall of the straight groove (319); a closing block (315) is fixedly connected to the top of the long rod (320); a sliding block (316) is fixedly connected to the top of the closing block (315); a rotating plate (321) is rotatably installed inside the grinding barrel (302); a plurality of sliding grooves (317) evenly distributed in a circular array are provided inside the rotating plate (321); and the sliding block (316) is slidably connected inside the sliding groove (317).

5. A device for detecting heavy metal residues in freshwater products according to claim 4, characterized in that: An opening and closing gear (312) is fixedly sleeved on the outer circumference of the rotating disk (321); a fixed disk (314) is fixedly connected to the top of the annular placement disk (41); a plurality of fixed gears (313) evenly distributed in an annular array are fixedly connected to one side of the fixed disk (314); the fixed gears (313) and the placement rack (42) correspond one to one, and the opening and closing gears (312) and the fixed gears (313) are meshingly connected; A microwave generator 1 and a microwave generator 2 are respectively arranged on the top of the fixed base (1), and the microwave generator 1 and the microwave generator 2 are symmetrically arranged.

6. A device for detecting heavy metal residues in freshwater products according to claim 5, characterized in that: The top of the fixed base (1) is fixedly connected to two symmetrically arranged columns (44), a horizontal slide rail (45) is installed between the two columns (44), a vertical slide rail (46) is installed on the moving end of the horizontal slide rail (45), and a detection head (47) is installed on the moving end of the vertical slide rail (46).

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