Detection equipment for heavy metal ions in food

Abstract

The invention relates to the technical field of food detection equipment, in particular to detection equipment for heavy metal ions in food, the detection equipment comprises a detection box and a detector mounted in the detection box, a mounting rack is fixed in the detection box, a swing mechanism is arranged in the detection box, and the swing mechanism is connected with the detection box through a connecting rod. The swing mechanism comprises a cross rod fixed in the detection box, a sliding plate is arranged on the outer wall of the cross rod in a sliding mode, an arc-shaped plate is fixed to the top end of the sliding plate, an air cylinder is installed on the inner wall of the detection box, and a toothed bar is fixed to the output end of the air cylinder. The reagent and the sample are gradually contacted and reacted under a relatively mild condition, so that the safety of the detection process is further improved, the reaction can be ensured to be fully and stably carried out, the problems of detection component loss or incomplete reaction and the like caused by violent reaction are reduced, and the accuracy and the reliability of a subsequent detection result are improved.

Description

Technical Field

[0001] This invention relates to the field of food testing equipment technology, and in particular to a device for detecting heavy metal ions in food. Background Technology

[0003] Existing equipment often uses a method of adding all the test reagents to the sample solution at once. However, some test reagents react violently with the components in the food sample. Adding a large amount at once can easily cause the solution to boil over and splash, which may not only damage the test components but also pose a safety hazard of reagent leakage.

[0004] In view of this, we will study and improve the existing problems to provide a device for detecting heavy metal ions in food, aiming to solve the problems and improve the practical value through this technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and to propose a device for detecting heavy metal ions in food.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a detection device for heavy metal ions in food, comprising a detection box and a detector installed inside the detection box. A mounting frame is fixed inside the detection box, and a swing mechanism is provided inside the detection box. The swing mechanism includes a crossbar fixed inside the detection box, a sliding plate sliding on the outer wall of the crossbar, and an arc-shaped plate fixed at the top of the sliding plate. A cylinder is installed on the inner wall of the detection box, and a gear is fixed at the output end of the cylinder. A fixing frame is fixed at the bottom inside the detection box, and a rotating shaft rotates on the surface of the fixing frame. A disc is fixed at one end of the rotating shaft, and a protrusion slides on the surface of the disc. A linkage rod is sleeved on the outer wall of the protrusion. A sealing mechanism is provided above the sliding plate. The sealing mechanism includes a vertical plate fixed to the top of the mounting frame. A sliding rod slides inside the vertical plate, and a sealing cover is fixed to one end of the sliding rod. A gradient liquid addition mechanism is provided above the sealing cover. The gradient liquid addition mechanism includes a liquid storage tank installed at the top of the inside of the detection box. A blocking block slides inside the liquid storage tank. A limit rod is fixed to the side wall of the liquid storage tank. A magnetic plate slides on the outer wall of the limit rod. An inclined block is fixed to the bottom end of the magnetic plate. A threaded rod B rotates on the top of the sealing cover. A ring is threaded to the outer wall of the threaded rod B. A push block is fixed to the outer wall of the ring. The testing box is equipped with an auxiliary mechanism inside.

[0007] Preferably, the outer wall of the rotating shaft is fitted with a gear A, the rack meshes with the gear A, one end of the linkage rod slides on one side of the crossbar, and the other end of the linkage rod rotates on one side of the fixed frame.

[0008] Preferably, the surface of the disc is provided with a groove, the protrusion slides inside the groove, one end of the protrusion is fixed with a slider, the outer wall of the disc is fixed with a fixing plate, the inside of the fixing plate is a threaded rod A, the slider and the threaded rod A are threadedly connected, and the bottom end of the threaded rod A is fixed with a knob.

[0009] Preferably, airbags are installed on the inner wall of the mounting bracket and the inner wall of the sealing cover.

[0010] Preferably, the inner wall of the detection box is fixed with a gas storage tank, one end of the toothed rod is fixed with a push rod that slides inside the gas storage tank, one side of the mounting bracket is fixed with a horizontal tube, a connecting pipe connects the gas storage tank and the horizontal tube, an L-shaped rod slides on the outer wall of the slide rod, and one end of the L-shaped rod slides inside the horizontal tube.

[0011] Preferably, a first spring is sleeved on the outer wall of the slide rod, one end of the first spring is fixed to one side of the L-shaped rod, and the other end of the first spring is fixed to one side of the vertical plate.

[0012] Preferably, a torsion spring is sleeved on the outer wall of the limiting rod, one end of the torsion spring is fixed to the bottom end of the magnetic plate, and the other end of the torsion spring is fixed to the bottom end of the limiting rod.

[0013] Preferably, the outer wall of the threaded rod B is fitted with a gear B through a one-way bearing, and a rack is fixed on the surface of the sealing cover, with the gear B and the rack meshing with each other.

[0014] Preferably, the auxiliary mechanism includes a tank fixed to the inner wall of the detection box, a connecting pipe connected to the top of the tank, one end of the connecting pipe extending into the interior of the sealing cap, a vertical pipe connected to the connecting pipe fixed to one side of the tank, a piston rod sliding inside the vertical pipe, a pull rod fixed to one side of the sliding plate, and a rotating rod hinged between the piston rod and the pull rod.

[0015] Preferably, a circular plate slides inside the tank, and a second spring is provided inside the tank. One end of the second spring is fixed to the bottom end of the circular plate, and the other end of the second spring is fixed to the inner wall of the tank.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention moves the sealing cap, which in turn moves the threaded rod B and the pusher block. The pusher block presses against the inclined block, causing the magnetic plate and the block to move upwards. The reagent from the storage tank falls into the test tube. After the pusher block separates from the inclined block, the magnetic plate's gravity causes the block to reset, completing a single liquid addition cycle. In the initial state, the pusher block's position maximizes the upward movement of the block and the opening of the liquid outlet channel, stably discharging a portion of the reagent. The sealing cap continues to move to a specific distance, where the rack and gear B mesh to drive the threaded rod B to rotate, causing the pusher block to move downwards and changing its relative height to the inclined block. This shortens the upward movement distance of the subsequent block and reduces the opening of the liquid outlet channel. The cylinder is controlled to extend and retract twice, and the remaining reagent is added in a gradient through two independent liquid addition cycles. This effectively avoids the risks of violent reactions and boiling over caused by adding all the reagent to the test tube at once. This gradient mode allows the reagent and sample to gradually contact and react under relatively mild conditions, further improving the safety of the detection process and ensuring a sufficient and stable reaction. It reduces problems such as loss of detection components or incomplete reaction caused by violent reactions, thereby improving the accuracy and reliability of subsequent detection results.

[0017] 2. This invention utilizes a sliding plate that swings back and forth along the outer wall of a crossbar. The sliding plate causes an arc-shaped plate to swing synchronously, which in turn causes the test tube placed on it to swing and oscillate stably. Through the continuous oscillation of the test tube, the solvent inside the test tube can fully contact and mix with the food sample. This mixing action effectively breaks down the contact barrier between the sample and the solvent, promoting the rapid precipitation of heavy metal components from the food sample into the solvent. This avoids the problem of insufficient precipitation and detection lag caused by uneven mixing, thereby improving the efficiency of heavy metal ion detection.

[0018] 3. This invention uses a sliding rod to drive a fixed sealing cap towards one side of the test tube, thereby sealing the test tube and creating a closed detection space. This effectively blocks the diffusion path of toxic gases during the detection reaction, preventing toxic gases from leaking into the external environment and harming workers. It also effectively protects the health and safety of workers. At the same time, the closed environment also prevents external airflow and impurities from interfering with the detection reaction inside the test tube, indirectly ensuring the accuracy of the detection results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is one of the three-dimensional structural diagrams of the swing mechanism of the present invention; Figure 4 This is a second three-dimensional structural diagram of the swing mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram of section A; Figure 6 This is a three-dimensional structural diagram of the sealing mechanism of the present invention; Figure 7 This is one of the partial structural schematic diagrams of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram of section B; Figure 9 This is a second partial structural schematic diagram of the present invention.

[0020] Legend: 1. Detection box; 2. Detector; 3. Mounting bracket; 41. Crossbar; 42. Sliding plate; 43. Cylinder; 44. Rack; 45. Fixing bracket; 46. Rotating shaft; 47. Gear A; 48. Disc; 49. Protrusion; 410. Linkage rod; 411. Slider; 412. Fixing plate; 413. Threaded rod A; 414. Arc plate; 51. Vertical plate; 52. Sliding rod; 53. L-shaped rod; 54. Seal 55. Cover; 56. Gas tank; 57. Horizontal pipe; 58. Connecting pipe; 69. Push rod; 60. Liquid tank; 61. Block; 62. Limiting rod; 63. Magnetic plate; 64. Threaded rod B; 65. Ring; 66. Push block; 67. Inclined block; 68. Gear B; 69. Rack; 60. Tank body; 71. Connecting pipe; 72. Vertical pipe; 73. Piston rod; 74. Pull rod; 75. Rotating rod; 76. Circular plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] See Figures 1 to 9As shown, the present invention provides a detection device for heavy metal ions in food, including a detection box 1 and a detector 2 installed inside the detection box 1. A mounting frame 3 is fixed inside the detection box 1. A swing mechanism is provided inside the detection box 1. The swing mechanism includes a crossbar 41 fixed inside the detection box 1. A sliding plate 42 slides on the outer wall of the crossbar 41. An arc plate 414 is fixed at the top of the sliding plate 42. A cylinder 43 is installed on the inner wall of the detection box 1. A gear 44 is fixed at the output end of the cylinder 43. A fixing frame 45 is fixed at the bottom inside the detection box 1. A rotating shaft 46 rotates on the surface of the fixing frame 45. A disc 48 is fixed at one end of the rotating shaft 46. A protrusion 49 slides on the surface of the disc 48. A linkage rod 410 is sleeved on the outer wall of the protrusion 49. It should be noted that before testing, the test tube containing the test sample is placed inside the mounting bracket 3. After starting the cylinder 43, the output end of the cylinder 43 will drive the rack 44 to move linearly. Due to the meshing transmission relationship between the rack 44 and the gear A47, after the rack 44 moves to the latter half and forms a meshing transmission relationship with the gear A47, the gear A47 drives the coaxially connected rotating shaft 46 to rotate synchronously. The rotating shaft 46 further drives the end-fixed disc 48 to rotate synchronously. When the disc 48 rotates, it will drive the protrusion 49 on its surface to perform a circular motion. The protrusion 49 is nested in the limiting groove on the surface of the linkage rod 410. During the circular motion, it will slide relative to the limiting groove, and at the same time, it will generate a lateral driving force on the linkage rod 410, causing it to... The linkage rod 410 swings left and right around its connection point with the fixed frame 45. The swing of the linkage rod 410 is synchronously transmitted to the sliding plate 42 connected to it, causing the sliding plate 42 to swing back and forth along the outer wall of the crossbar 41. The arc plate 414 fixed at the top of the sliding plate 42 also swings synchronously. Finally, the arc plate 414 drives the test tube placed on it to swing and oscillate stably from left to right. Through the continuous oscillation of the test tube, the solvent inside the test tube can fully contact and mix with the food sample. Through the mixing action, the contact barrier between the sample and the solvent can be effectively broken, promoting the rapid precipitation of heavy metal components in the food sample into the solvent. This avoids the problem of insufficient precipitation of heavy metals and detection lag caused by uneven mixing, thereby improving the efficiency of heavy metal ion detection.

[0023] A sealing mechanism is provided above the sliding plate 42. The sealing mechanism includes a vertical plate 51 fixed to the top of the mounting bracket 3. A sliding rod 52 slides inside the vertical plate 51. A sealing cover 54 is fixed to one end of the sliding rod 52. It should be noted that since the first half of the rack 44 does not mesh with the gear A47, the rack 44 will first drive the push rod 58 to move synchronously, causing the push rod 58 to slide along the inside of the gas tank 55. The sliding of the push rod 58 will compress the gas inside the gas tank 55. The compressed gas is transported to the inside of the horizontal tube 56 through the connecting pipe 57. As the gas accumulates in the horizontal tube 56, the amount of gas inside the horizontal tube 56 gradually increases. The increased amount of gas generates a thrust that acts on the L-shaped rod 53 and pushes it to move. The L-shaped rod 53 then drives the slide rod 52 along the inside of the vertical plate 51. The sliding rod 52 drives the sealing cap 54, which is fixed at the end, to move closer to one side of the test tube. The sealing cap 54 completes the sealing operation of the test tube, thereby forming a closed detection space. This effectively blocks the diffusion path of toxic gases during the detection reaction, preventing toxic gases from leaking into the external environment of the equipment and preventing toxic gases from harming the workers. This effectively protects the health and safety of the workers. At the same time, the closed environment can also prevent external air flow, impurities, and other factors from interfering with the detection reaction inside the test tube, indirectly ensuring the accuracy of the detection results.

[0024] A gradient liquid addition mechanism is provided above the sealing cover 54. The gradient liquid addition mechanism includes a liquid storage tank 61 installed at the top of the inside of the detection box 1. A block 62 slides inside the liquid storage tank 61. A limit rod 63 is fixed to the side wall of the liquid storage tank 61. A magnetic plate 64 slides on the outer wall of the limit rod 63. An inclined block 68 is fixed at the bottom end of the magnetic plate 64. A threaded rod B65 rotates at the top of the sealing cover 54. A ring 66 is threadedly connected to the outer wall of the threaded rod B65. A push block 67 is fixed to the outer wall of the ring 66. It should be noted that as the sealing cap 54 moves closer to the test tube, it causes the threaded rod B65 to move accordingly. The threaded rod B65, through the ring 66, causes the push block 67 to move synchronously. The moving push block 67 presses against the inclined block 68, causing it to move upward. The inclined block 68 then causes the magnetic plate 64 to move upward synchronously. Since the magnetic plate 64 and the plug 62 are magnetically connected, the upward movement of the magnetic plate 64 will synchronously cause the plug 62 to move upward, ultimately causing the plug 62 to detach from the seal on the bottom of the storage tank 61. The reagent inside the storage tank 61 then flows out through the outlet. When the pusher 67 and the inclined block 68 separate, the magnetic plate 64, under its own gravity, will cause the block 62 to reset, resealing the bottom of the storage tank 61, completing the opening and closing cycle of a single liquid addition. In the initial state, the pusher 67 is located at the top of the threaded rod B65. This position allows the pusher 67 to push the inclined block 68 and move the block 62 upward to a relatively high distance, resulting in the maximum opening of the liquid outlet channel at the bottom of the storage tank 61. Therefore, at this stage, 50% of the reagent inside the storage tank 61 can be stably discharged. When the two sets of sealing caps... When 54 continues to move to a specific distance, rack 610 and gear B69 mesh with each other. Gear B69 then drives threaded rod B65 to rotate. The rotation of threaded rod B65 drives ring 66 to move downward along its axis. Ring 66 then drives push block 67 to move downward synchronously. This changes the initial relative height between push block 67 and inclined block 68. As a result, when push block 67 squeezes inclined block 68, the upward movement distance of inclined block 68, which drives magnetic plate 64 and block 62, is shortened. The opening of the liquid outlet channel at the bottom of storage tank 61 is reduced. Subsequently, the cylinder 43 is controlled to move back and forth. By extending and retracting twice, the remaining 50% of reagent can be added in a gradient manner, divided into 30% and 20% through two independent liquid addition cycles. This effectively avoids the risks of violent reactions and boiling over caused by adding all the reagent to the test tube at once. Through this gradient mode, the reagent and sample gradually come into contact and react under relatively mild conditions, which not only further improves the safety of the detection process, but also ensures that the reaction is sufficient and stable, reducing problems such as loss of detection components or incomplete reaction caused by violent reactions, thereby improving the accuracy and reliability of subsequent detection results.

[0025] The testing box 1 has an auxiliary mechanism inside.

[0026] In an optional embodiment, a gear A47 is sleeved on the outer wall of the rotating shaft 46, and the rack 44 meshes with the gear A47. One end of the linkage rod 410 slides on one side of the crossbar 41, and the other end of the linkage rod 410 rotates on one side of the fixed frame 45.

[0027] In an optional embodiment, a groove is provided on the surface of the disc 48, and a protrusion 49 slides inside the groove. A slider 411 is fixed to one end of the protrusion 49. A fixing plate 412 is fixed to the outer wall of the disc 48. A threaded rod A413 rotates inside the fixing plate 412. The slider 411 and the threaded rod A413 are threadedly connected. A knob is fixed to the bottom end of the threaded rod A413.

[0028] It should be noted that when testing different types of samples, the operator can manually turn the knob to rotate the threaded rod A413. The rotation of the threaded rod A413 will drive the slider 411 to slide along the groove on the surface of the disc 48. The slider 411 will then drive the protrusion 49 to move synchronously, thereby changing the eccentricity of the protrusion 49. Ultimately, this allows for flexible adjustment of the swing amplitude of the sliding plate 42. For powdered samples, a smaller swing amplitude can be adjusted to ensure thorough mixing of the sample and reagents while avoiding powder splashing that could affect the testing environment. For paste-like samples, a larger swing amplitude can be adjusted to effectively break up the agglomeration of the paste-like sample, ensuring uniform contact and full reaction between the sample and reagents. This avoids deviations in test results due to uneven mixing, improves the equipment's adaptability to different forms of food samples, and broadens the equipment's application range.

[0029] In an optional embodiment, airbags are installed on the inner wall of the mounting bracket 3 and the inner wall of the sealing cover 54. When the sealing cover 54 approaches the test tube and completes the sealing, the airbags can fit against the outer wall of the test tube and the inner wall of the mounting bracket 3 to form a flexible seal, fill the sealing gap, further prevent the leakage of toxic gas, and enhance safety protection.

[0030] In an optional embodiment, an air tank 55 is fixed to the inner wall of the detection box 1, a push rod 58 that slides inside the air tank 55 is fixed to one end of the toothed rod 44, a horizontal tube 56 is fixed to one side of the mounting bracket 3, a connecting pipe 57 connects the air tank 55 and the horizontal tube 56, an L-shaped rod 53 slides on the outer wall of the slide rod 52, and one end of the L-shaped rod 53 slides inside the horizontal tube 56.

[0031] In an optional embodiment, a first spring is sleeved on the outer wall of the slide rod 52. One end of the first spring is fixed to one side of the L-shaped rod 53, and the other end of the first spring is fixed to one side of the vertical plate 51. When the gas pushes the L-shaped rod 53 to the closed position of the sealing cover 54, the gas will continue to push the L-shaped rod 53 to move along the inside of the horizontal tube 56. At this time, the L-shaped rod 53 will compress the first spring and overcome the friction between it and the slide rod 52 to continue moving a distance along the surface of the slide rod 52. When the cylinder 43 contracts, the gas flows back into the gas storage tank 55, and the gas pressure in the horizontal tube 56 is released. At this time, the elastic restoring force of the first spring will drive the L-shaped rod 53, the slide rod 52, and the sealing cover 54 to quickly reset, preparing for the next test operation. At the same time, during the sealing state maintenance stage, the elastic force of the first spring can also provide a continuous pressing force for the sealing cover 54, ensuring that the sealing cover 54 fits tightly against the test tube, improving the reliability and stability of the seal, and maintaining the sealing state without loosening in response to slight vibrations or air pressure fluctuations during equipment operation.

[0032] In an optional embodiment, a torsion spring is sleeved on the outer wall of the limiting rod 63. One end of the torsion spring is fixed to the bottom end of the magnetic plate 64, and the other end of the torsion spring is fixed to the bottom end of the limiting rod 63. When the push block 67 is reset, the back of the push block 67 pushes the magnetic plate 64 to deflect at a certain angle through the inclined block 68. At this time, the torsion spring stores force. When the push block 67 disengages from the inclined block 68, the torsion spring releases its elastic force to drive the magnetic plate 64 to reset. This can effectively prevent the push block 67 from pushing the magnetic plate 64 again during the reset process, and prevent the block block 62 from disengaging from the sealing position due to the accidental movement of the magnetic plate 64. This can prevent reagent leakage or over-addition and ensure the accurate start and stop of the liquid addition process.

[0033] In an optional embodiment, the outer wall of the threaded rod B65 is fitted with a gear B69 via a one-way bearing, and a rack 610 is fixed to the surface of the sealing cover 54, with the gear B69 and the rack 610 meshing with each other.

[0034] In an optional embodiment, the auxiliary mechanism includes a tank 71 fixed to the inner wall of the detection box 1. A connecting pipe 72 is connected to the top of the tank 71. One end of the connecting pipe 72 extends into the interior of the sealing cap 54. A vertical pipe 73 connected to the connecting pipe 72 is fixed to one side of the tank 71. A piston rod 74 slides inside the vertical pipe 73. A pull rod 75 is fixed to one side of the sliding plate 42. A rotating rod 76 is hinged between the piston rod 74 and the pull rod 75.

[0035] In an optional embodiment, a circular plate 77 slides inside the tank 71, and a second spring is provided inside the tank 71. One end of the second spring is fixed to the bottom end of the circular plate 77, and the other end of the second spring is fixed to the inner wall of the tank 71. When the detection is completed, as the toxic gas is processed or discharged, the gas pressure inside the tank 71 decreases, and the elastic restoring force of the second spring will drive the circular plate 77 to return to its initial state, preparing for the next collection of toxic gas.

[0036] It should be noted that when the sliding plate 42 moves to the left, it drives the pull rod 75 to move to the left simultaneously. This causes the pull rod 75 to drive the piston rod 74 downward via the rotating rod 76. At this time, a negative pressure is formed inside the vertical tube 73. Since toxic gas is generated when the reagent reacts with the sample, the negative pressure inside the vertical tube 73 draws the toxic gas into the vertical tube 73 through the connecting pipe 72. When the sliding plate 42 moves to the left, it causes the piston rod 74 to move upward, compressing the toxic gas. This toxic gas then enters the canister 71 through the connecting pipe 72. As the toxic gas enters the canister 71, the pressure increases. The increased air pressure inside the container 71 pushes the circular plate 77 downward along the inside of the container 71. On the one hand, after the reaction between the reagent and the sample is completed, the staff can observe the scale line on the outer wall of the container 71 to read the volume of toxic gas, thus directly observing the degree of reaction between the reagent and the sample and judging whether the reaction is sufficient. On the other hand, the toxic gas is promptly inhaled and stored inside the container 71, effectively preventing the accumulation or leakage of toxic gas in the detection area, blocking the path of toxic gas damage to the health of the staff, and further strengthening the safety protection of the entire detection process. Furthermore, since the sliding plate 42 is made of transparent material, it will not obstruct the detection light or detection signal of the detector 2. The detection signal emitted by the detector 2 can directly penetrate the sliding plate 42 and accurately act on the reactants inside the test tube. At the same time, the feedback signal generated by the reactants can be transmitted to the detector 2 without obstruction. Based on this, the detector 2 can accurately detect and analyze the heavy metal content and state of existence in the test tube. The detection signal will be further transmitted to an external display so that staff can intuitively view the detection data.

[0037] Working principle: Before testing, the test tube containing the test sample is placed inside the mounting frame 3. After starting the cylinder 43, the output end of the cylinder 43 will drive the rack 44 to move linearly. Due to the meshing transmission relationship between the rack 44 and the gear A47, after the rack 44 moves to the latter half and forms a meshing transmission relationship with the gear A47, the gear A47 drives the coaxially connected rotating shaft 46 to rotate synchronously. The rotating shaft 46 further drives the end-fixed disc 48 to rotate synchronously. When the disc 48 rotates, it will drive the protrusions 49 on its surface to perform circumferential motion. Block 49 is nested in the limiting groove on the surface of the linkage rod 410. During the circular motion, it will slide relative to the limiting groove and generate a lateral driving force on the linkage rod 410, causing the linkage rod 410 to swing left and right around its connection point with the fixed frame 45. The swing of the linkage rod 410 will be transmitted synchronously to the sliding plate 42 connected to it, causing the sliding plate 42 to swing back and forth along the outer wall of the crossbar 41. The arc plate 414 fixed at the top of the sliding plate 42 will also swing synchronously. Finally, the arc plate 414 will drive the test tube placed on it to swing and oscillate stably left and right. Since the first half of the rack 44 does not mesh with the gear A47, the rack 44 will first drive the push rod 58 to move synchronously, causing the push rod 58 to slide along the inside of the gas storage tank 55. The sliding of the push rod 58 will compress the gas inside the gas storage tank 55. The compressed gas is transported to the inside of the horizontal tube 56 through the connecting pipe 57. As the gas accumulates in the horizontal tube 56, the amount of gas inside the horizontal tube 56 gradually increases. The increased amount of gas generates a thrust that acts on the L-shaped rod 53 and pushes it to move. The L-shaped rod 53 then drives the slide rod 52 to slide along the inside of the vertical plate 51. The slide rod 52 then drives the sealing cap 54 fixed at the end to move closer to one side of the test tube. The sealing cap 54 is used to complete the sealing operation of the test tube, thereby forming a closed detection space.

[0038] As the sealing cap 54 moves closer to the test tube, it moves the threaded rod B65. The threaded rod B65, through the ring 66, moves the push block 67 synchronously. The moving push block 67 presses the inclined block 68 upward, causing it to move. The inclined block 68 then moves the magnetic plate 64 upward. Since the magnetic plate 64 and the blocking block 62 are magnetically connected, the upward movement of the magnetic plate 64 will synchronously move the blocking block 62 upward, ultimately causing the blocking block 62 to detach from the seal on the bottom of the storage tank 61. The reagent inside the storage tank 61 then falls into the test tube through the outlet. When the push block 67 and the inclined block 68 separate, the magnetic plate 64, under its own gravity, will cause the blocking block 62 to reset, resealing the bottom of the storage tank 61, completing the opening and closing cycle of a single liquid addition. In the initial state, the push block 67 is located at the top of the threaded rod B65. This position allows the push block 67 to press the inclined block 68 and move upward. When the moving block 62 moves upward to a relatively high level, the opening of the liquid outlet channel at the bottom of the storage tank 61 is at its maximum. Therefore, at this stage, 50% of the reagent inside the storage tank 61 can be stably discharged. When the two sets of sealing caps 54 continue to move to a specific distance, the rack 610 and the gear B69 mesh with each other. The gear B69 then drives the threaded rod B65 to rotate. The rotation of the threaded rod B65 drives the ring 66 to move downward along its axis. The ring 66 then drives the push block 67 to move downward synchronously. This changes the initial relative height between the push block 67 and the inclined block 68. As a result, when the push block 67 squeezes the inclined block 68, the upward movement distance of the inclined block 68, which drives the magnetic plate 64 and the block 62, is shortened. The opening of the liquid outlet channel at the bottom of the storage tank 61 is reduced. Subsequently, by controlling the cylinder 43 to extend and retract twice, the remaining 50% of the reagent can be added in a gradient manner in two independent liquid addition cycles, divided into 30% and 20%.

[0039] When the sliding plate 42 moves to the left, it drives the pull rod 75 to move to the left simultaneously. This causes the pull rod 75 to drive the piston rod 74 downward through the rotating rod 76. At this time, a negative pressure is formed inside the vertical tube 73. Since toxic gas is produced when the reagent reacts with the sample, the negative pressure inside the vertical tube 73 draws the toxic gas into the vertical tube 73 through the connecting pipe 72. When the sliding plate 42 moves to the left, it causes the piston rod 74 to move upward and squeeze the toxic gas. This allows the toxic gas to enter the canister 71 through the connecting pipe 72. As the toxic gas enters the canister 71, the internal pressure of the canister 71 increases. This increased pressure pushes the circular plate 77 downward along the inside of the canister 71.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting heavy metal ions in food, comprising a detection box (1) and a detector (2) installed inside the detection box (1), characterized in that: The testing box (1) is equipped with a mounting bracket (3) inside. The testing box (1) is equipped with a swing mechanism inside. The swing mechanism includes a crossbar (41) fixed inside the testing box (1). A sliding plate (42) slides on the outer wall of the crossbar (41). An arc plate (414) is fixed at the top of the sliding plate (42). A cylinder (43) is installed on the inner wall of the testing box (1). A gear (44) is fixed at the output end of the cylinder (43). A fixing frame (45) is fixed at the bottom inside the testing box (1). A rotating shaft (46) rotates on the surface of the fixing frame (45). A disc (48) is fixed at one end of the rotating shaft (46). A protrusion (49) slides on the surface of the disc (48). A linkage rod (410) is sleeved on the outer wall of the protrusion (49). A sealing mechanism is provided above the sliding plate (42). The sealing mechanism includes a vertical plate (51) fixed to the top of the mounting bracket (3). A sliding rod (52) slides inside the vertical plate (51). A sealing cover (54) is fixed to one end of the sliding rod (52). A gradient liquid addition mechanism is provided above the sealing cover (54). The gradient liquid addition mechanism includes a storage tank (61) installed at the top of the inside of the detection box (1). A block (62) slides inside the storage tank (61). A limit rod (63) is fixed on the side wall of the storage tank (61). A magnetic plate (64) slides on the outer wall of the limit rod (63). An inclined block (68) is fixed at the bottom end of the magnetic plate (64). A threaded rod B (65) rotates on the top of the sealing cover (54). A ring (66) is threadedly connected to the outer wall of the threaded rod B (65). A push block (67) is fixed on the outer wall of the ring (66). The testing box (1) is equipped with an auxiliary mechanism inside.

2. The detection device for heavy metal ions in food according to claim 1, characterized in that: The outer wall of the rotating shaft (46) is fitted with a gear A (47), the rack (44) meshes with the gear A (47), one end of the linkage rod (410) slides on one side of the crossbar (41), and the other end of the linkage rod (410) rotates on one side of the fixed frame (45).

3. The detection device for heavy metal ions in food according to claim 1, characterized in that: The surface of the disc (48) is provided with a groove, the protrusion (49) slides inside the groove, one end of the protrusion (49) is fixed with a slider (411), the outer wall of the disc (48) is fixed with a fixing plate (412), the inside of the fixing plate (412) is rotated with a threaded rod A (413), the slider (411) and the threaded rod A (413) are threadedly connected, and the bottom end of the threaded rod A (413) is fixed with a knob.

4. The detection device for heavy metal ions in food according to claim 1, characterized in that: Airbags are installed on the inner wall of the mounting bracket (3) and the inner wall of the sealing cover (54).

5. The detection device for heavy metal ions in food according to claim 1, characterized in that: The inner wall of the test box (1) is fixed with a gas storage tank (55), one end of the toothed rod (44) is fixed with a push rod (58) that slides inside the gas storage tank (55), one side of the mounting bracket (3) is fixed with a horizontal tube (56), a connecting pipe (57) connects the gas storage tank (55) and the horizontal tube (56), and an L-shaped rod (53) slides on the outer wall of the slide rod (52), one end of the L-shaped rod (53) slides inside the horizontal tube (56).

6. The detection device for heavy metal ions in food according to claim 5, characterized in that: The outer wall of the slide bar (52) is fitted with a first spring, one end of which is fixed to one side of the L-shaped rod (53), and the other end of which is fixed to one side of the vertical plate (51).

7. The detection device for heavy metal ions in food according to claim 1, characterized in that: The outer wall of the limiting rod (63) is fitted with a torsion spring, one end of which is fixed to the bottom end of the magnetic plate (64), and the other end of which is fixed to the bottom end of the limiting rod (63).

8. The detection device for heavy metal ions in food according to claim 1, characterized in that: The outer wall of the threaded rod B (65) is fitted with a gear B (69) through a one-way bearing, and a rack (610) is fixed on the surface of the sealing cover (54). The gear B (69) and the rack (610) mesh with each other.

9. The detection device for heavy metal ions in food according to claim 1, characterized in that: The auxiliary mechanism includes a tank (71) fixed to the inner wall of the detection box (1), a connecting pipe (72) connected to the top of the tank (71), one end of the connecting pipe (72) penetrating into the interior of the sealing cap (54), a vertical pipe (73) connected to the connecting pipe (72) fixed to one side of the tank (71), a piston rod (74) sliding inside the vertical pipe (73), a pull rod (75) fixed to one side of the sliding plate (42), and a rotating rod (76) hinged between the piston rod (74) and the pull rod (75).

10. A detection device for heavy metal ions in food according to claim 9, characterized in that: A circular plate (77) slides inside the tank (71), and a second spring is provided inside the tank (71). One end of the second spring is fixed to the bottom end of the circular plate (77), and the other end of the second spring is fixed to the inner wall of the tank (71).

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