A grain and oil food heavy metal rapid detection device

Abstract

This utility model belongs to the field of food safety testing technology, and particularly relates to a rapid detection device for heavy metals in grain and oil foods. Addressing the problems of poor temperature control and low grinding and mixing efficiency affecting accuracy in existing testing equipment during the pretreatment process, the following solution is proposed: It includes an outer cylinder, a grinding component, a stirring component, and a temperature control component. The temperature control component includes a heat-conducting rotating rod and a cooling chamber opened inside the outer cylinder wall. This utility model drives the grinding component and the stirring component to rotate simultaneously, realizing the grinding and mixing of grain and oil foods during extraction, improving the raw material processing efficiency of grain and oil foods, and thus achieving rapid detection. Heat dissipation is achieved through a combination of air cooling and water cooling to avoid thermal denaturation of the sample or volatilization of heavy metals. The grinding component uses spaced grinding blades and an inwardly folded material coil plate to achieve efficient grinding. The stirring component is connected to the intermittent drive of the toothed and ball-headed lever to achieve gentle and thorough mixing, avoiding damage to the reaction products.

Description

Technical Field

[0001] This utility model relates to a detection device, specifically a rapid detection device for heavy metals in grain and oil foods, belonging to the field of food safety detection technology. Background Technology

[0002] Food safety in grains and oils is a major concern due to the insidious and cumulative nature of heavy metal contamination. Currently, while various technologies exist for rapid detection of heavy metals in grains, several bottlenecks remain to be addressed. Traditional detection methods, such as atomic absorption spectrometry and inductively coupled plasma mass spectrometry, while highly accurate, are expensive, complex to operate, have long testing cycles, and require specialized laboratory environments, making them unsuitable for rapid on-site detection. Furthermore, while some existing rapid testing devices emphasize portability and speed, they often neglect temperature control during sample pretreatment and lack effective active cooling mechanisms. Simultaneously, in the pursuit of rapid detection, the efficiency and uniformity of sample grinding, as well as the mixing effect of reaction reagents, are crucial to the accuracy of the final detection. Electrochemical detection technology, due to its high sensitivity, simple equipment, low cost, and portability, shows potential for rapid heavy metal detection in grains; however, its detection performance largely depends on effective sample pretreatment.

[0003] In existing technologies, such as the user-friendly heavy metal detection device for agricultural products disclosed in CN218917356U, the device integrates a crushing and mixing mechanism. It crushes agricultural products using crushing rollers and transports and mixes them using a screw conveyor and stirring blades, aiming to achieve continuous detection of multiple samples. However, such devices generate significant heat during sample pretreatment, especially in the crushing and mixing stages, which may cause protein denaturation, encapsulation of heavy metal ions, or loss of volatile heavy metals, thus affecting the accuracy of the detection results. Another example is the rapid detection device for pesticides and heavy metals in grains disclosed in CN116858645A. This device attempts to accelerate the mixing and separation of samples and reagents and simplify the operation by using centrifugal motion through the design of a rotating plate, sleeve, and corrugated ring column. However, its temperature control measures are insufficient. During sample pretreatment, especially in the shaking and centrifugation stages, the heat generated by friction and chemical reactions cannot be effectively controlled, which may also affect the sensitivity and accuracy of the detection. Utility Model Content

[0004] This invention provides a rapid detection device for heavy metals in grains and oils to solve the problems of poor temperature control and low crushing and mixing efficiency in the pretreatment process that affect the accuracy of the above-mentioned detection equipment.

[0005] This utility model achieves the above-mentioned objectives through the following technical solution: a rapid detection device for heavy metals in grain and oil food, including an outer cylinder, a crushing component and a stirring component arranged from top to bottom inside the outer cylinder, and a temperature control component. The temperature control component includes a heat-conducting rotating rod and a cooling cavity opened in the wall of the outer cylinder. The heat-conducting rotating rod is arranged to rotate vertically inside the outer cylinder. The crushing component is fixedly connected to the rod of the heat-conducting rotating rod, and the stirring component is connected to the heat-conducting rotating rod by a speed reduction drive. The heat-conducting rotating rod includes an outer rod and an inner rod, both of which are provided with cavities. The inner rod is fixedly inserted into the cavity of the outer rod. The bottom ends of the cavities of the outer rod and the inner rod are connected. The top end of the outer rod is connected to multiple exhaust nozzles along the tangential direction, and the top end of the inner rod is connected to multiple air inlets along the tangential direction. The crushing assembly includes crushing blades and a coil plate arranged at intervals. The coil plate is folded inward. The mixing assembly includes a rotating ring and mixing blades. The rotating ring is positioned and sleeved on the outside of the outer rod. The mixing blades are fixedly connected to the rotating ring. A ball-head lever is movably arranged inside the rotating ring. A lever tooth is fixedly connected to the outer rod body. In the initial state, the lever tooth is stacked with the protruding part of the ball-head lever body.

[0006] As a further improvement of this utility model: multiple annularly distributed support legs are connected to the bottom edge of the outer cylinder, and a drive motor is fixedly connected to the middle part of the bottom of the outer cylinder, and the motor shaft of the drive motor is coaxially fixedly connected to the heat-conducting rotating rod.

[0007] As a further embodiment of this utility model: a screen is fixedly connected inside the outer cylinder, and the opening position of the cooling chamber and the connection position of the crushing component are both located on the outer cylinder above the screen. The outer cylinder body is also fixedly connected with an inlet pipe and an outlet pipe. The inlet pipe is connected to the bottom end of the cooling chamber, and the outlet pipe is connected to the top end of the cooling chamber.

[0008] As a further embodiment of this utility model: the outer cylinder body located below the screen is also connected to a drug delivery pipe and a mixed liquid delivery pipe, the drug delivery pipe and the mixed liquid delivery pipe are arranged vertically, the bottom surface of the outer cylinder is inclined, and the connection position of the mixed liquid delivery pipe is located at the inclined bottom end of the bottom surface of the outer cylinder.

[0009] As a further embodiment of this utility model: several positioning connecting rods are fixedly connected to the inner rod within the cavity of the outer rod. The other end of the positioning connecting rod is fixedly connected to the inner wall of the cavity of the outer rod. The air inlet connected to the inner rod and the exhaust nozzle connected to the outer rod are evenly distributed in a ring shape. The air inlet end of the air inlet is convex and located on the outer side of the inner rod, and the air inlet end of the exhaust nozzle is convex and located in the inner cavity of the outer rod.

[0010] As a further embodiment of this utility model: the crushing component also includes a scraper, which is connected to the bottom end of the roll plate, and the lower surface of the scraper is attached to the screen.

[0011] As a further embodiment of this utility model: a sealed stirring bearing is sleeved on the outer side of the rotating ring of the stirring assembly, the inner ring of the sealed stirring bearing is fixedly connected to the lower half of the rotating ring, and multiple bearing positioning support rods are fixedly connected to the outer ring of the sealed stirring bearing. The bearing positioning support rods are vertically fixedly connected to the bottom surface of the outer cylinder.

[0012] As a further embodiment of this utility model: a tapered bearing is fitted on the body of the outer rod, the inner ring of the tapered bearing is fixedly connected to the body of the outer rod, an end cap is movably fitted on the upper end of the opening of the outer cylinder, a tapered through hole is opened in the middle part of the top surface of the end cap, and when the end cap is mated and fitted with the outer cylinder, the tapered through hole is fitted on the outer ring of the tapered bearing.

[0013] As a further embodiment of this utility model: the top surface of the end cap is connected to a feed inlet, and a mesh cover is connected above the middle part of the top surface of the end cap. The mesh cover is placed on the outer side of the upper end of the heat-conducting rotating rod, and a conical partition is connected inside the mesh cover. The inner rod of the heat-conducting rotating rod protrudes from the rod body and moves through the conical partition.

[0014] As a further improvement of this utility model: the rotating ring has a movable cavity inside, a ball head lever is held in the movable cavity, and a spring is also installed in the movable cavity. The spring abuts against the surface of the ball head lever, and the ball head lever is convex at the front end when it is in the initial state.

[0015] The beneficial effects of this utility model are: 1. This utility model is equipped with an outer cylinder, a crushing component, a stirring component, and a temperature control component. The temperature control component includes a heat-conducting rotating rod and a cooling cavity opened in the outer cylinder wall. The heat-conducting rotating rod is vertically rotating inside the outer cylinder. The crushing component is fixed to the rod of the heat-conducting rotating rod. The stirring component is connected to the heat-conducting rotating rod with a speed reduction drive, which can drive the crushing component and the stirring component to rotate simultaneously. This enables the crushing and mixing of grain and oil food during crushing and extraction. The stirring component rotates with a speed reduction, which ensures that the extraction reagent and the crushed sample powder are in uniform contact and reaction, and avoids the damage of possible reaction products caused by high-speed shearing. This can greatly improve the raw material processing efficiency of grain and oil food, thereby improving the detection efficiency and enabling rapid detection. Secondly, since grain and oil food will generate heat during the crushing process, the composite temperature control component composed of the heat-conducting rotating rod and the cooling cavity opened in the outer cylinder wall effectively controls the temperature inside the outer cylinder within a stable range, avoiding the problem of decreased detection accuracy caused by protein denaturation and solidification, encapsulation of heavy metal ions or loss of volatile heavy metal elements in grain and oil food samples due to excessive temperature. 2. The heat-conducting rotating rod of this utility model includes an outer rod and an inner rod, both of which are provided with cavities. The top of the outer rod is connected to multiple exhaust nozzles along the tangential direction, and the top of the inner rod is connected to multiple air inlets along the tangential direction. The heat-conducting rotating rod adopts a double-layer hollow structure in which the inner rod and the outer rod are nested and the cavities are connected. With the annularly distributed air inlets at the top of the inner rod and the annularly distributed exhaust nozzles at the top of the outer rod, the heat-conducting rotating rod can spontaneously form an airflow circulation channel when rotating at high speed. The airflow flows from the cavity of the inner rod through the bottom and upward into the cavity of the outer rod, and finally exits from the exhaust nozzles. The air convection principle is used to forcibly remove a large amount of frictional heat generated during the crushing process. At the same time, the cooling cavity opened in the outer cylinder wall can be connected to external coolant for water cooling, forming a heat dissipation method that combines air cooling and water cooling. 3. The pulverizing component of this utility model includes pulverizing blades and a coiled material plate arranged at intervals. The coiled material plate is folded inward. The stirring component includes a rotating ring and stirring blades. The rotating ring is positioned and sleeved on the outside of the outer rod. The stirring blades are fixedly connected to the rotating ring. A ball-head lever is movably arranged inside the rotating ring. A tooth is fixedly connected to the outer rod body. In the initial state, the tooth overlaps with the protruding part of the ball-head lever body. The pulverizing blades arranged at intervals and the folded material plate cooperate with each other. The pulverizing blades are responsible for high-speed cutting and crushing of the input grains and oils to ensure that the sample particle size is small enough to increase the specific surface area of ​​the subsequent reaction. The folded material plate generates a centripetal vortex when rotating, which can continuously roll back the material splashed onto the cylinder wall to the pulverizing area, thereby improving the pulverizing efficiency. When the high-speed rotating heat-conducting rod intermittently actuates the ball-head lever through the tooth, the rotating ring and stirring blades will form intermittent stirring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the outer cylinder of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the outer cylinder of this utility model; Figure 4 This utility model Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the structure of the heat-conducting rotating rod and the crushing assembly of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the heat-conducting rotating rod of this utility model; Figure 7 This is a schematic diagram of the cross-sectional structure of the inner rod in the air intake state of this utility model; Figure 8 This is a schematic diagram of the cross-sectional structure of the outer rod in the air outlet state of this utility model; Figure 9 This is a schematic diagram of the cross-sectional structure of the end cap of this utility model; Figure 10 This is a cross-sectional structural diagram of the connection between the ball head lever and the swivel ring of this utility model.

[0017] In the diagram: 1. Outer cylinder; 11. Support leg; 12. Drug delivery pipe; 13. Mixture delivery pipe; 14. Screen; 15. Cooling chamber; 16. Liquid inlet pipe; 17. Liquid outlet pipe; 2. Heat-conducting rotating rod; 21. Outer rod; 22. Inner rod; 23. Conical bearing; 24. Gear; 25. Positioning connecting rod; 26. Air inlet; 27. Exhaust nozzle; 3. Crushing assembly; 31. Crushing blade; 32. Coil plate; 33. Scraper; 4. Stirring assembly; 41. Rotary ring; 42. Stirring blade; 43. Bearing; 44. Bearing positioning support rod; 45. Ball head lever; 46. Movable chamber; 47. Spring; 5. End cap; 51. Feed inlet; 52. Mesh cover; 53. Conical partition; 54. Conical perforation; 6. Drive motor. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1 like Figures 1 to 10 As shown, a rapid heavy metal detection device for grains and oils includes an outer cylinder 1. Inside the outer cylinder 1, from top to bottom, are a pulverizing component 3 and a stirring component 4. The outer cylinder 1 also includes a temperature control component, which includes a heat-conducting rotating rod 2 and a cooling chamber 15 formed within the cylinder wall of the outer cylinder 1. The heat-conducting rotating rod 2 rotates vertically within the outer cylinder 1. The pulverizing component 3 is fixedly connected to the rod of the heat-conducting rotating rod 2. The stirring component 4 is connected to the heat-conducting rotating rod 2 via a speed reduction drive, enabling the pulverizing component 3 and the stirring component 4 to rotate simultaneously. This achieves the mixing and stirring during the pulverization and extraction of grains and oils. Furthermore, the speed reduction rotation of the stirring component 4 ensures... The extraction reagent reacts uniformly with the pulverized sample powder, avoiding the damage to the reaction products that may be formed by high-speed shearing. This can greatly improve the raw material processing efficiency of grain and oil products, thereby improving the detection efficiency and enabling rapid detection. Secondly, since grain and oil products generate heat during the pulverization process, the composite temperature control component, which is composed of the heat-conducting rotating rod 2 and the cooling cavity 15 opened in the wall of the outer cylinder 1, effectively controls the temperature inside the outer cylinder 1 within a stable range. This avoids the problem of decreased detection accuracy caused by protein denaturation and solidification in grain and oil product samples due to excessive temperature, which can lead to the loss of heavy metal ions or volatile heavy metal elements. The heat-conducting rotating rod 2 includes an outer rod 21 and an inner rod 22, both of which are hollow. The inner rod 22 is fixedly inserted into the cavity of the outer rod 21. The bottom ends of the cavities of the outer rod 21 and the inner rod 22 are connected. The top end of the outer rod 21 is connected to multiple exhaust nozzles 27 along the tangential direction. The top end of the inner rod 22 is connected to multiple air inlets 26 along the tangential direction. The heat-conducting rotating rod 2 adopts a double-layer hollow structure in which the inner rod 22 and the outer rod 21 are nested and connected in cavity. With the annularly distributed air inlets 26 at the top end of the inner rod 22 and the annularly distributed exhaust nozzles 27 at the top end of the outer rod 21, the heat-conducting rotating rod 2 can spontaneously form an airflow circulation channel when rotating at high speed. The airflow flows from the cavity of the inner rod 22 upward through the bottom and into the cavity of the outer rod 21, and finally exits from the exhaust nozzles 27. The air convection principle is used to forcibly remove a large amount of frictional heat generated during the crushing process. At the same time, the cooling cavity 15 opened in the wall of the outer cylinder 1 can be connected to external coolant for water cooling, forming a heat dissipation method that combines air cooling and water cooling. The crushing component 3 includes spaced-apart crushing blades 31 and a coiled material plate 32, with the coiled material plate 32 folded inwards. The stirring component 4 includes a rotating ring 41 and stirring blades 42. The rotating ring 41 is positioned and sleeved on the outside of the outer rod 21, and the stirring blades 42 are fixedly connected to the rotating ring 41. A ball-head lever 45 is movably arranged inside the rotating ring 41. A lever tooth 24 is fixedly connected to the body of the outer rod 21. In its initial state, the lever tooth 24 overlaps with the protruding part of the ball-head lever 45. The spaced-apart crushing blades 31 and the inwardly folded coiled material plate 32 in the crushing component 3 cooperate with each other. The crushing blades 31 are responsible for high-speed cutting and crushing of the input grains and oils to ensure that the sample particle size is small enough to increase the specific surface area of ​​the subsequent reaction. The coiled material plate 32 generates a centripetal vortex when rotating, which can continuously roll back the material splashed onto the cylinder wall to the crushing area, improving crushing efficiency. When the high-speed rotating heat-conducting rod 2 moves the ball head lever 45 through the prying teeth 24 and drives the rotating ring 41 to rotate, it can drive the stirring blades 42 to rotate. Under the action of centrifugal force, the movable ball head lever 45 will retract inward when the rotating ring 41 rotates, thereby separating the prying teeth 24 and the ball head lever 45. When the rotation speed of the rotating ring 41 decreases, the centrifugal force decreases, and the ball head lever 45 can return to its initial state, that is, it can be moved by the prying teeth 24 again. This can realize the intermittent movement of the ball head lever 45, so that the rotating ring 41 and the stirring blades 42 can be stirred in an intermittent rotation manner.

[0020] Example 2 Improvements based on Example 1: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, the bottom edge of the outer cylinder 1 is connected to multiple annularly distributed support legs 11. The middle part of the bottom of the outer cylinder 1 is fixedly connected to a drive motor 6, and the motor shaft of the drive motor 6 is coaxially fixedly connected to the heat-conducting rotating rod 2. The multiple annularly distributed support legs 11 provide stable support for the entire device. The drive motor 6 provides driving force to the heat-conducting rotating rod 2, ensuring that the crushing component 3 and the stirring component 4 can be driven synchronously.

[0021] Furthermore, a screen 14 is fixedly connected inside the outer cylinder 1. The opening position of the cooling chamber 15 and the connection position of the pulverizing component 3 are both located on the outer cylinder 1 above the screen 14. The outer cylinder 1 is also fixedly connected to an inlet pipe 16 and an outlet pipe 17. The inlet pipe 16 is connected to the bottom end of the cooling chamber 15, and the outlet pipe 17 is connected to the upper end of the cooling chamber 15. The screen 14 divides the outer cylinder 1 into an upper pulverizing zone and a lower extraction and stirring reaction zone, so that the fine sample powder after pulverization can pass through the screen 14 and enter the lower area, while larger, insufficiently pulverized particles are intercepted and continue to be processed by the pulverizing blade 31, realizing a semi-continuous operation of the pulverization and stirring extraction process, improving the overall processing efficiency. After the coolant enters from the bottom, it is heated and rises naturally, forming a stable thermal convection, which can continuously carry the heat out from the outlet pipe 17 at the top of the cooling chamber 15, avoiding the decrease in cooling efficiency caused by the mixing of hot and cold liquids.

[0022] Furthermore, the outer cylinder 1 located below the sieve 14 is also connected to a reagent delivery pipe 12 and a mixture delivery pipe 13. The reagent delivery pipe 12 and the mixture delivery pipe 13 are arranged vertically. The bottom surface of the outer cylinder 1 is inclined, and the connection point of the mixture delivery pipe 13 is located at the inclined bottom end of the bottom surface of the outer cylinder 1. The reagent delivery pipe 12 located above can inject various chemical reagents required for heavy metal extraction, such as extraction acid and buffer solution, into the reaction zone during stirring. The inclined bottom surface of the outer cylinder 1 can utilize the principle of natural gravity guidance so that the mixture after the reaction is completed can automatically flow to and collect at the lowest point of the inclined bottom end, thereby ensuring that the mixture is almost completely discharged through the mixture delivery pipe 13, reducing sample residue.

[0023] like Figure 2 , Figure 3 and Figure 4As shown, several positioning connecting rods 25 are fixedly connected to the inner rod 22 within the cavity of the outer rod 21. The other end of the positioning connecting rod 25 is fixedly connected to the inner wall of the cavity of the outer rod 21. The air inlet 26 connected to the inner rod 22 and the exhaust 27 connected to the outer rod 21 are evenly distributed in a ring. The air inlet end of the air inlet 26 is convex and located on the outside of the inner rod 22, and the air inlet end of the exhaust 27 is convex and located in the inner cavity of the outer rod 21. The positioning connecting rods 25 form radial support and circumferential positioning between the cavities of the inner rod 22 and the outer rod 21, preventing... To prevent the inner rod 22 from swaying or resonating relative to the outer rod 21 during high-speed rotation, the air inlet 26 and the exhaust nozzle 27 are arranged in a uniform ring shape. The air inlet end of the air inlet 26 is designed to be convex and located on the outside of the inner rod 22, which can more effectively capture and guide the ambient air with lower temperature into the cavity of the inner rod 22, increasing the air intake efficiency. The air inlet end of the exhaust nozzle 27 is convex and located in the inner cavity of the outer rod 21, which can better disturb the hot airflow in the cavity of the outer rod 21 and facilitate the exhaust of the hot air in the inner cavity, thereby improving the heat exchange efficiency of the entire self-circulating heat dissipation system.

[0024] like Figure 1 , Figure 2 and Figure 5 As shown, the crushing component 3 also includes a scraper 33, which is connected to the bottom end of the coil plate 32. The lower surface of the scraper 33 is attached to the screen 14. The scraper 33 rotates together with the crushing component 3, and can continuously scrape away the fine particles or fibrous materials that clog the mesh of the screen 14 during the crushing and filtering process. This effectively prevents the screen 14 from clogging and ensures that the pores of the screen 14 remain unobstructed for a long time. This ensures that the sample powder with qualified particle size can pass through the screen after crushing. At the same time, the continuous scraping of the screen 14 by the scraper 33 also plays a secondary grinding role on the material, which helps to further break down those particles that are just stuck in the mesh or close to the mesh size, so that they can pass through the screen 14.

[0025] like Figures 1 to 4 As shown, a sealed stirring bearing 43 is fitted on the outer side of the rotating ring 41 of the stirring assembly 4. The inner ring of the sealed stirring bearing 43 is fixedly connected to the lower half of the rotating ring 41. Multiple bearing positioning struts 44 are fixedly connected to the outer ring of the sealed stirring bearing 43. The bearing positioning struts 44 are vertically fixedly connected to the bottom surface of the outer cylinder 1. The rotating ring 41 and its connected stirring blades 42 are suspended and supported on the bottom surface of the outer cylinder 1 by the bearing positioning struts 44. This ensures that there is sufficient space between the bottom of the rotating ring 41 and the inclined bottom surface of the outer cylinder 1, so that during the liquid discharge process, the reacted mixture can flow to and collect at the inlet of the mixture delivery pipe 13 at the inclined bottom end of the bottom surface of the outer cylinder 1, so as to achieve complete discharge of the mixture and reduce liquid residue. At the same time, the sealed stirring bearing 43 ensures that the rotating ring 41 can rotate smoothly under the fixed support formed by the bearing positioning struts 44.

[0026] like Figure 1 and Figure 9 As shown, a tapered bearing 23 is fitted onto the body of the outer rod 21. The inner ring of the tapered bearing 23 is fixedly connected to the body of the outer rod 21. An end cap 5 is movably mounted on the upper end of the opening of the outer cylinder 1. A tapered through hole 54 is provided in the middle of the top surface of the end cap 5. When the end cap 5 is mated and mounted with the outer cylinder 1, the tapered through hole 54 is fitted onto the outer ring of the tapered bearing 23. The tapered bearing 23 mounted on the body of the outer rod 21 can simultaneously bear the combined axial and radial loads. Its inner ring is fixedly connected to the outer rod 21 to ensure the synchronous rotation of the tapered bearing 23 and the heat-conducting rotating rod 2. The tapered through hole 54 mounted on the outer ring of the tapered bearing 23 makes the end cap 5 function as the bearing outer ring seat. When the end cap 5 is mounted on the outer cylinder 1, it not only seals the cylinder opening but also completes the positioning and support of the upper end of the heat-conducting rotating rod 2.

[0027] Furthermore, the top surface of the end cap 5 is connected to a feed inlet 51, and a mesh cover 52 is connected above the middle part of the top surface of the end cap 5. The mesh cover 52 covers the upper outer side of the heat-conducting rotating rod 2, and a conical partition 53 is connected inside the mesh cover 52. The inner rod 22 of the heat-conducting rotating rod 2 protrudes from the rod body and moves through the conical partition 53. The mesh cover 52 can effectively prevent operators from accidentally contacting the upper end of the high-speed rotating heat-conducting rod 2, eliminating safety hazards. The mesh on the mesh cover 52 ensures the flow of air inside and outside. The conical baffle 53 forms a flow guiding chamber inside the mesh cover 52. The conical structure of the conical baffle 53 can guide and accelerate the air drawn in by the air inlet 26; at the same time, it can also play a certain role in the diffusion and guidance of the hot air flow discharged by the exhaust nozzle 27, preventing the hot air from directly hitting the mesh cover 52, which is conducive to the rapid dissipation of heat into the surrounding environment.

[0028] like Figure 3 , Figure 4 and Figure 10 As shown, the rotating ring 41 has a movable cavity 46 inside, in which a ball-head lever 45 is held. A spring 47 is also installed inside the movable cavity 46, and the spring 47 abuts against the surface of the ball-head lever 45. In the initial state, the ball-head lever 45 has a convex front end. Due to the action of the spring 47, the ball-head lever 45 can be convex in the initial state, which allows the pry teeth 24 to pry the ball-head lever 45. When the ball-head lever 45 is subjected to centrifugal force, it will overcome the elasticity of the spring 47 and retract into the movable cavity 46. At this time, the pry teeth 24 cannot pry the ball-head lever 45, and the rotation speed of the rotating ring 41 will gradually decrease, and the centrifugal force will decrease, so that the spring 47 can push the ball-head lever 45 back to the initial position. This allows the pry teeth 24 to intermittently pry the ball-head lever 45.

[0029] Working principle: The sample to be tested is placed inside the outer cylinder 1, then the end cap 5 is closed, and the drive motor 6 is started. The power is directly transmitted to the heat-conducting rotating rod 2, which is fixed to the coaxial line, so that it starts to rotate at high speed. The heat-conducting rotating rod 2 drives the crushing component 3 fixed to its rod body to operate synchronously. The crushing blades 31 arranged in a spaced manner powerfully cut and crush the grain and oil samples, while the inwardly folded material roll plate 32 generates a centripetal vortex during rotation, continuously rolling the material splashed onto the cylinder wall back into the crushing area to ensure thorough and uniform crushing. During the crushing process, in order to control the high temperature generated by intense friction, the high-speed rotating heat-conducting rotor 2 draws in ambient cold air through the air inlet 26 distributed in a ring at the top of the inner rod 22. The airflow enters the cavity of the outer rod 21 through the bottom connection and is finally discharged from the exhaust nozzle 27 at the top of the outer rod 21, forming a forced convection heat dissipation channel, which effectively removes internal heat. The coolant is pumped into the cooling cavity 15 opened in the wall of the outer cylinder 1 through the liquid inlet pipe 16 and flows from the bottom to the liquid outlet pipe 17 at the top. The cylinder wall is continuously cooled by liquid cooling. The combination of air cooling and water cooling ensures the temperature of the crushing chamber is stable and prevents thermal denaturation of the sample or volatilization of heavy metals. The initially pulverized material, guided by centrifugal force and the coil plate 32, passes through the screen 14 fixed inside the outer cylinder 1. Powder with the correct particle size enters the mixing reaction zone below, while particles that do not meet the standard are further pulverized. The scraper 33 connected to the bottom of the coil plate 32 rotates with the assembly, its lower plate surface moving in close contact with the upper surface of the screen 14, continuously scraping to prevent the mesh from clogging. At the same time, the rotation of the heat-conducting rotating rod 2 intermittently actuates the ball head lever 45 through the prying teeth 24 fixed to the outer rod 21, causing the rotating ring 41 to rotate intermittently. The intermittent stirring of the stirring blades 42 promotes the full and uniform mixing and reaction of the reagent and sample powder, avoiding interference from continuous high-speed shearing in the reaction process. After the reaction is completed, utilizing the inclined design of the bottom surface of the outer cylinder 1, the completely reacted mixture is completely discharged through the mixture delivery pipe 13 located at the lowest point and transferred to the subsequent detection unit for rapid analysis.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rapid detection device for heavy metals in grain and oil foods, comprising an outer cylinder (1), characterized in that: The outer cylinder (1) is provided with a crushing component (3) and a stirring component (4) from top to bottom. The outer cylinder (1) is also provided with a temperature control component, which includes a heat-conducting rotating rod (2) and a cooling cavity (15) opened in the wall of the outer cylinder (1). The heat-conducting rotating rod (2) is arranged to rotate vertically in the outer cylinder (1). The crushing component (3) is fixedly connected to the rod of the heat-conducting rotating rod (2). The stirring component (4) is connected to the heat-conducting rotating rod (2) by a speed reduction drive. The heat-conducting rotating rod (2) includes an outer rod (21) and an inner rod (22) both having cavities. Part of the inner rod (22) is fixedly inserted into the cavity of the outer rod (21). The bottom ends of the cavities of the outer rod (21) and the inner rod (22) are connected. The top end of the outer rod (21) is connected to multiple exhaust nozzles (27) along the tangential direction. The top end of the inner rod (22) is connected to multiple air inlets (26) along the tangential direction. The crushing assembly (3) includes crushing blades (31) and a coil plate (32) arranged at intervals. The coil plate (32) is folded inward. The stirring assembly (4) includes a rotating ring (41) and stirring blades (42). The rotating ring (41) is positioned and sleeved on the outside of the outer rod (21). The stirring blades (42) are fixedly connected to the rotating ring (41). A ball head lever (45) is movably arranged inside the rotating ring (41). A lever tooth (24) is fixedly connected to the body of the outer rod (21). In the initial state, the lever tooth (24) is stacked with the ball head rod body of the ball head lever (45) that protrudes outward.

2. The rapid detection equipment for heavy metals in grains and oils according to claim 1, characterized in that: The outer cylinder (1) has multiple annularly distributed support legs (11) connected to the bottom edge. The outer cylinder (1) has a drive motor (6) fixedly connected to the middle part of the bottom. The motor shaft of the drive motor (6) is coaxially fixedly connected to the heat-conducting rotating rod (2).

3. The rapid detection equipment for heavy metals in grains and oils according to claim 2, characterized in that: The outer cylinder (1) has a screen (14) fixedly connected inside. The opening position of the cooling chamber (15) and the connection position of the crushing component (3) are both located on the outer cylinder (1) above the screen (14). The outer cylinder (1) also has an inlet pipe (16) and an outlet pipe (17) fixedly connected to its body. The inlet pipe (16) is connected to the bottom end of the cooling chamber (15), and the outlet pipe (17) is connected to the upper end of the cooling chamber (15).

4. The rapid detection equipment for heavy metals in grains and oils according to claim 3, characterized in that: The outer cylinder (1) located below the screen (14) is also connected to a drug delivery pipe (12) and a mixture delivery pipe (13). The drug delivery pipe (12) and the mixture delivery pipe (13) are arranged vertically. The bottom surface of the outer cylinder (1) is inclined, and the connection position of the mixture delivery pipe (13) is located at the inclined bottom end of the bottom surface of the outer cylinder (1).

5. The rapid detection equipment for heavy metals in grains and oils according to claim 1, characterized in that: The inner rod (22) is fixedly connected to a number of positioning connecting rods (25) on the rod body inside the cavity of the outer rod (21). The other end of the positioning connecting rod (25) is fixedly connected to the inner wall of the cavity of the outer rod (21). The air inlet (26) connected to the rod body of the inner rod (22) and the exhaust nozzle (27) connected to the rod body of the outer rod (21) are uniformly distributed in a ring shape. The air inlet end of the air inlet (26) is convex and located outside the inner rod (22), and the air inlet end of the exhaust nozzle (27) is convex and located inside the cavity of the outer rod (21).

6. The rapid detection equipment for heavy metals in grains and oils according to claim 2, characterized in that: The crushing component (3) also includes a scraper (33), which is connected to the bottom end of the roll plate (32), and the lower plate surface of the scraper (33) is attached to the screen (14).

7. The rapid detection equipment for heavy metals in grains and oils according to claim 1, characterized in that: A sealed stirring bearing (43) is fitted on the outer side of the rotating ring (41) of the stirring assembly (4). The inner ring of the sealed stirring bearing (43) is fixedly connected to the lower half of the rotating ring (41). A plurality of bearing positioning support rods (44) are fixedly connected to the outer ring of the sealed stirring bearing (43). The bearing positioning support rods (44) are fixedly connected vertically to the bottom surface of the outer cylinder (1).

8. The rapid detection equipment for heavy metals in grains and oils according to claim 1, characterized in that: A tapered bearing (23) is fitted on the body of the outer rod (21). The inner ring of the tapered bearing (23) is fixedly connected to the body of the outer rod (21). An end cap (5) is movably held at the upper end of the opening of the outer cylinder (1). A tapered through hole (54) is opened in the middle of the top surface of the end cap (5). When the end cap (5) is engaged with the outer cylinder (1), the tapered through hole (54) is fitted on the outer ring of the tapered bearing (23).

9. The rapid detection equipment for heavy metals in grains and oils according to claim 8, characterized in that: The top surface of the end cap (5) is connected to the feed inlet (51). A mesh cover (52) is connected above the middle part of the top surface of the end cap (5). The mesh cover (52) is placed on the outer side of the upper end of the heat-conducting rotating rod (2). A conical partition (53) is connected inside the mesh cover (52). The inner rod (22) of the heat-conducting rotating rod (2) protrudes from the rod body and moves through the conical partition (53).

10. The rapid detection equipment for heavy metals in grains and oils according to claim 1, characterized in that: The rotating ring (41) has a movable cavity (46) inside, a ball head lever (45) is placed in the movable cavity (46), and a spring (47) is also placed in the movable cavity (46). The spring (47) abuts against the surface of the ball head lever (45). In the initial state, the ball head lever (45) has an outwardly convex front end.

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