A high-sensitivity metal detection device and detection method for neotame production

Abstract

The application discloses a high-sensitivity metal detection device for neotame production, which comprises a shell, a plurality of vertical pipes in the shell, and a feeding mechanism for conveying materials, a fixed frame is arranged on the inner wall of the shell, a rotating mechanism for driving the plurality of vertical pipes to make circular motion is arranged on the fixed frame, a pneumatic mechanism for blowing gas to the bottom of the vertical pipe is arranged on the rotating mechanism, a sealing mechanism for sealing the top of the vertical pipe is arranged in the shell, an electromagnetic detection sensor for metal detection is arranged below the sealing mechanism, and two discharge pipes penetrate through the top wall of the shell. The electromagnetic detection sensor is arranged, the powder is moved for multiple times, the powder can pass through the detection magnetic field for multiple times, the airflow disturbance can scatter the slight agglomerated powder of the neotame, the tiny metal scraps wrapped by the powder are completely exposed in the magnetic field, and the single-time missed detection probability is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of neotame production technology, and more specifically, to a high-sensitivity metal detection device and method for neotame production. Background Technology

[0002] Neotame production involves multiple stages. For example, in the post-processing and packaging stages, the crystallized neotame needs to be crushed and screened to pulverize the dried crystals to a specific particle size for packaging. In this stage, the components inside the crusher and screener will continuously generate stainless steel powder and fine metal fragments during the long-term high-speed impact and shearing of the neotame crystals. These metal particles will contaminate the neotame and need to be detected and removed.

[0003] The current processing method is mostly drop detection. Neotame powder falls through a pipe, and an electromagnetic detection sensor is set around the pipe. When metal particles are mixed in the powder, the metal generates an eddy current effect, which causes magnetic field distortion. The ring detection coil collects the magnetic field change signal in real time and transmits it to the control system to realize the online identification and detection of tiny metal foreign objects. However, the above method still has shortcomings. Due to the use of a single large-diameter free-fall design, the large-diameter material feeding results in a thick material layer and metal particles are easily wrapped by agglomerated powder. The center sensitivity and edge blind zone characteristics of the electromagnetic detection sensor make the missed detection rate of metal attached to the wall extremely high. Secondly, the lack of material breaking down during the feeding process means that agglomerated powder cannot be effectively removed, further increasing the risk of metal encapsulation and leading to a higher rate of missed detections. Furthermore, the friction between the powder and the large-diameter pipe wall generates a large amount of static electricity, which seriously interferes with the electromagnetic field of the loop coil, causing false alarms or missed detections. Finally, when metal particles are detected under high-volume feeding, a large amount of material needs to be processed over a long period of time, resulting in a long rejection interval, which reduces the overall operating efficiency and makes it difficult to adapt to the needs of continuous production.

[0004] In conclusion, the current detection device still has shortcomings and needs to be improved. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] Therefore, the object of the present invention is to provide a high-sensitivity metal detection device for neotame production, comprising a housing, a plurality of vertical tubes located within the housing, and a feeding mechanism for conveying materials. A fixing frame is provided on the inner wall of the outer shell, and a rotating mechanism for driving multiple vertical tubes to perform circular motion is provided on the fixing frame. The rotating mechanism is provided with a pneumatic mechanism for blowing air to the bottom of the vertical tubes. The outer casing contains a sealing mechanism for sealing the top of the vertical pipe. Directly below the sealing mechanism is an electromagnetic detection sensor for metal detection. The outer casing also contains a lifting mechanism for driving the sealing mechanism and the electromagnetic detection sensor to move vertically. The top wall of the outer shell has two discharge pipes, and the bottom of the discharge pipes is provided with a docking assembly for connecting with the top of the vertical pipe.

[0007] As a preferred technical solution: As described above, a high-sensitivity metal detection device for neotame production includes a feeding mechanism comprising a feeding device, one end of which extends from the outer casing, and a guide hopper is provided below the discharge port of the feeding device, the guide hopper being welded and fixed to the inner wall of the outer casing by metal parts.

[0008] Through the above technical solution, the feeding device can be a servo micro quantitative screw feeder. By rotating the screw at low speed, the material can be accurately and quantitatively fed into the vertical tube. This ensures that the weight of the material loaded into each vertical tube is consistent, and makes the subsequent detection speed and material layer thickness completely uniform.

[0009] As described above, a high-sensitivity metal detection device for neotame production includes a rotating mechanism comprising a rotating base, an upper cover plate fixed to the top surface of the rotating base, and a lower cover plate fixed to the bottom surface of the rotating base. The fixed frame has a central hole for the rotating seat to pass through. The motor is bolted to the fixed frame. The upper half of the outer circular wall of the rotating seat is connected to the bearing in the central hole. The lower half of the outer circular wall of the rotating seat is fitted with a gear ring, which meshes with a gear. The gear pin is fixed to the main shaft of the motor.

[0010] With the above technical solution, the upper cover plate, lower cover plate and rotating seat can be fixed with bolts, so that the upper cover plate and lower cover plate can be disassembled, which facilitates the cleaning and maintenance of components such as grooves and sleeves.

[0011] As described above, in a high-sensitivity metal detection device for neotame production, the rotating base is annular, and the surface of the rotating base has multiple grooves arranged in a ring. The bottom of each groove has a perforated slot, and the bottom end of the perforated slot communicates with the bottom surface of the rotating base. A sleeve is inserted into the groove and fixedly connected thereto. A fixing ring is integrally formed at the top of the sleeve. Multiple through holes are provided on the sleeve wall at the plane position of the groove in an annular arrangement.

[0012] The above technical solution, with its multiple through-hole design, allows the airflow entering the groove to flow evenly into the sleeve, ensuring a stable flow field formed inside the vertical pipe.

[0013] As described above, a high-sensitivity metal detection device for neotame production includes a vertical tube whose bottom end penetrates the upper cover plate and is inserted into a sleeve. The outer diameter of the vertical tube is smaller than the inner diameter of the sleeve. Both the top and bottom ends of the vertical tube are open. The outer wall of the vertical tube and the inner wall of the fixing ring are provided with mating threads. The horizontal plane at the bottom end of the vertical tube is above the horizontal plane at the bottom end of the sleeve. A conical block is positioned directly below the bottom end of the vertical tube and is fixedly mounted on the lower cover plate. The vertical pipe is installed vertically and is made of non-metallic material.

[0014] Through the above technical solution, the inner wall of the vertical tube is electrolytically polished and coated with an antistatic food-grade coating. This makes the inner wall of the vertical tube smooth, and the material rises and falls at a uniform speed. At the same time, it can reduce the friction between the material and the inner wall of the vertical tube, and avoid the interference of frictional static electricity with the accuracy of detection. The vertical tube is preferably made of food-grade polyoxymethylene, which has excellent mechanical properties, wear resistance, and self-lubrication, which is conducive to improving service life and detection effect.

[0015] As described above, a high-sensitivity metal detection device for neotame production includes a pneumatic mechanism comprising a flow divider shroud located on the inner circumference of a rotating base. The bottom end of the flow divider shroud is open, and an air inlet pipe is connected to the bottom end of the flow divider shroud via a rotary joint. The bottom end of the air inlet pipe passes through a lower cover plate and extends out of the outer casing. Multiple diversion pipes are welded and connected on the outer circular wall of the diversion hood. One end of each diversion pipe passes through the rotating seat and extends into the groove.

[0016] The above technical solution seals the gap between the diverter and the rotating seat with sealant, preventing airflow from leaking out of the groove through the gap.

[0017] As described above, a high-sensitivity metal detection device for neotame production includes a sealing mechanism comprising a nut sleeve, an integrally formed collar fitted on the outer wall of the bottom end of the nut sleeve, and an integrally formed sealing plug connected to the bottom surface of the collar. The sealing plug has a circular cross-section, the inner diameter of the sealing plug is larger than the inner diameter of the collar, and the outer diameter of the sealing plug is consistent with the inner diameter of the vertical pipe.

[0018] With the above technical solution, the bottom surface of the nut sleeve is located above the bottom surface of the collar. When the bottom surface of the collar is in contact with the top surface of the vertical pipe, there is a gap between the sealing sheet that is in contact with the bottom surface of the nut sleeve and the top of the vertical pipe, so as not to interfere with the rotational movement of the vertical pipe.

[0019] As described above, a high-sensitivity metal detection device for neotame production includes a lifting mechanism comprising a lead screw and a connecting plate fixedly connected to the outer circular wall of a collar. The top end of the lead screw passes through the outer shell and is connected to the bearing of the outer shell. The bottom end of the lead screw passes through a nut sleeve and is threadedly connected to the nut sleeve. The bottom end face of the lead screw is fixedly connected to a sealing plate. The sealing plate is circular and its diameter is equal to or slightly smaller than the inner diameter of the collar.

[0020] The bottom end of the connecting plate is fixedly connected to the housing of the electromagnetic detection sensor. A guide post runs through the connecting plate, and the top end of the guide post is welded and fixed to the inner wall of the housing.

[0021] With the above technical solution, the electromagnetic detection sensor and the nut sleeve are designed to be coaxial. When the nut sleeve drives the sealing plug to seal the top of the vertical pipe, the electromagnetic detection sensor can be coaxial with the vertical pipe, thus ensuring that the powder inside the vertical pipe is located in the high-sensitivity detection area.

[0022] As described above, a high-sensitivity metal detection device for neotame production includes a docking assembly comprising a movable tube, a second abutment ring integrally formed with the outer wall of the movable tube, and a third abutment ring integrally formed with the inner wall of the movable tube. The top of the movable tube extends into the discharge tube, and the inner diameter of the movable tube is the same as the outer diameter of the vertical tube. A first abutting ring that mates with the second abutting ring is integrally formed on the inner wall of the discharge tube. The movable tube passes through the lifting plate and is fixedly connected to the lifting plate, and one side of the lifting plate is slidably connected to the inner wall of the outer shell.

[0023] With the above technical solution, the lifting plate is L-shaped as a whole. The vertical end of the lifting plate is connected to the inner wall of the outer shell by a guide rail sliding connection. This can improve the moving accuracy of the lifting plate and ensure that the moving tube can be accurately connected to the vertical tube.

[0024] A highly sensitive metal detection method for neotame production includes the following steps: S1. The feeding mechanism quantitatively delivers the material to be tested into the corresponding vertical pipe; S2. The vertical pipe rotates to below the sealing mechanism under the drive of the rotating mechanism; S3. The sealing mechanism and electromagnetic detection sensor begin to descend under the drive of the lifting mechanism. The sealing mechanism seals the top of the vertical tube, and the electromagnetic detection sensor is sleeved on the outside of the vertical tube. S4. The material in the vertical pipe rises and is fed continuously under the action of the pneumatic mechanism, and the electromagnetic detection sensor detects the material in motion. S5. After the test is completed, the sealing mechanism and the electromagnetic detection sensor move upward to reset, and the vertical pipe continues to rotate under the drive of the rotating mechanism. S6. When no metal is detected, the vertical pipe rotates to the bottom of the first discharge pipe. The discharge pipe is connected to the vertical pipe through the docking assembly. The pneumatic mechanism blows the material out through the discharge pipe for centralized collection. When metal is detected, the vertical tube rotates to the bottom of the second discharge tube. The discharge tube connects with the vertical tube through the docking assembly. The pneumatic mechanism blows the material out through the discharge tube for centralized collection and metal rejection. Beneficial effects

[0025] (1) The present invention is equipped with an electromagnetic detection sensor, which includes a ring coil. The ring coil is the core sensitive element and the sensing body. Combined with the signal processing circuit, it can form a complete metal foreign object detection sensor assembly. The neotame powder forms a reciprocating motion of suspension, falling and re-suspension in the vertical tube. Through multiple movements, the powder can pass through the detection magnetic field multiple times. Furthermore, through airflow disturbance, the slightly agglomerated neotame powder can be dispersed, and the tiny metal fragments wrapped in the powder are completely exposed to the magnetic field, greatly reducing the probability of single missed detection.

[0026] (2) The present invention replaces the traditional single large-diameter feeding pipe with multiple vertical pipes. By reducing the diameter of the vertical pipes, all the powder in the vertical pipes is located in the high-sensitivity detection area at the center of the electromagnetic detection sensor, completely avoiding the low-sensitivity blind zone at the edge of the coil, and effectively improving the detection sensitivity.

[0027] (3) The present invention uses multiple vertical tubes, each of which can achieve quantitative feeding. The amount of powder detected at one time is small, the material layer inside the tube is extremely thin, the powder extrusion friction is greatly reduced, and the amount of static electricity generated is greatly reduced. This avoids the interference of static noise with the electromagnetic detection sensor from the source, and further improves the detection sensitivity.

[0028] (4) With two discharge pipes, when metal particles are detected, only a quantitative amount of powder in the corresponding vertical pipe needs to be sent to the corresponding discharge pipe for screening, while the rest of the vertical pipe is normally transported to the other discharge pipe. There is no need to scrap the entire section of powder, the powder loss is minimized, and continuous production is not interrupted, significantly improving the work efficiency.

[0029] (5) Since the present invention adopts quantitative feeding, the weight of the powder in the vertical tube remains unchanged during multiple reciprocating movements. This ensures that the powder rising and feeding speeds are consistent, avoiding detection errors caused by material flow fluctuations.

[0030] (6) This invention enables continuous and large-scale production operations by having multiple vertical pipes work in rotation, and the detection, feeding and unloading are carried out in parallel, which is conducive to its widespread use. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein Figure 1 This is a perspective view of the present invention; Figure 2 This is an internal front view of the present invention; Figure 3 This is an internal three-dimensional top view of the present invention; Figure 4 This is an internal three-dimensional bottom view of the present invention; Figure 5 This is an exploded perspective view of the rotating base and vertical tube of the present invention; Figure 6 This is a perspective sectional view of the rotating base and vertical tube of the present invention; Figure 7 This is a perspective view of the rotating seat, groove, and hole of the present invention; Figure 8 This is a perspective sectional view of the nut sleeve and collar of the present invention; Figure 9 This is a perspective view of the nut sleeve and collar of the present invention; Figure 10 This is a three-dimensional sectional view of the discharge pipe and the movable pipe of the present invention.

[0032] In the diagram: 1. Outer shell; 2. Fixing frame; 3. Vertical tube; 4. Electromagnetic detection sensor; 5. Discharge pipe; 6. Rotating seat; 7. Upper cover plate; 8. Lower cover plate; 9. Groove; 10. Hole slot; 11. Sleeve; 12. Fixing ring; 13. Through hole; 14. Conical block; 15. Gear ring; 16. Air inlet pipe; 17. Diverter hood; 18. Diverter pipe; 19. Nut sleeve; 20. Collar; 21. Sealing plug; 22. Sealing plate; 23. Lead screw; 24. Connecting plate; 25. Guide column; 26. Discharge device; 27. Guide hopper; 28. Movable tube; 29. ​​First clamping ring; 30. Second clamping ring; 31. Third clamping ring; 32. Lifting plate. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0035] like Figures 1-10As shown in the figure, this invention discloses a high-sensitivity metal detection device for neotame production, including a housing 1, a plurality of vertical tubes 3 located inside the housing 1, and a feeding mechanism for conveying materials. A fixing frame 2 is provided on the inner wall of the outer casing 1. A rotating mechanism for driving multiple vertical tubes 3 to perform circular motion is provided on the fixing frame 2. A pneumatic mechanism for blowing air to the bottom of the vertical tubes 3 is provided on the rotating mechanism. The outer casing 1 is equipped with a sealing mechanism for sealing the top of the vertical tube 3. An electromagnetic detection sensor 4 for metal detection is located directly below the sealing mechanism. The outer casing 1 also contains a lifting mechanism for driving the sealing mechanism and the electromagnetic detection sensor 4 to move vertically. Two discharge pipes 5 pass through the top wall of the outer shell 1, and the bottom of the discharge pipe 5 is provided with a docking component for connecting with the top of the vertical pipe 3.

[0036] The feeding mechanism includes a feeding device 26, one end of which extends out of the outer shell 1. A guide hopper 27 is provided below the discharge port of the feeding device 26. The guide hopper 27 is fixed to the inner wall of the outer shell 1 by welding metal parts.

[0037] Specifically, during implementation, the powder enters the feeding device 26 through the feed end of the feeding device 26. The feeding device 26 can push the powder to move. The powder eventually falls through the discharge port and enters the vertical pipe 3 through the guide hopper 27. At this time, the vertical pipe 3 rotates to below the sealing mechanism under the action of the rotating mechanism. The lifting mechanism drives the sealing mechanism and the electromagnetic detection sensor 4 to move down synchronously. The sealing mechanism seals the top of the vertical pipe 3, and the electromagnetic detection sensor 4 can be sleeved around the outside of the vertical pipe 3.

[0038] Next, the pneumatic mechanism blows gas upward from the bottom of the vertical tube 3. The powder moves upward under the blowing of the airflow. By controlling the pneumatic mechanism to blow gas intermittently, the powder can perform reciprocating motion of suspension, falling and suspension in the vertical tube 3. In this way, the powder can pass through the electromagnetic detection sensor 4 multiple times.

[0039] The electromagnetic detection sensor 4 is a ring coil wound with copper wire. The ring coil serves as the sensing element and has a shielded shell, an insulating frame, a shielding layer, and terminals. Together, they form a complete ring detection structure. The ring coil is used to form a stable alternating magnetic field in the powder flow area and detects tiny metal particles in the powder by capturing the distortion of the eddy current magnetic field generated by the metal.

[0040] After the test is completed, the vertical pipe 3 is rotated to the bottom of the discharge pipe 5 under the action of the rotating mechanism. The discharge pipe 5 can be connected to the vertical pipe 3 through the docking assembly. At this time, the powder is blown by the pneumatic mechanism and collected in a concentrated manner through the discharge pipe 5. There are two discharge pipes 5. One of the discharge pipes 5 discharges normally. When metal is detected, the powder is collected through the other discharge pipe 5 and rejected.

[0041] By repeating the above steps, continuous testing can be completed.

[0042] In one specific embodiment of the present invention, such as Figures 3-5 As shown, the rotating mechanism includes a rotating base 6, an upper cover plate 7 fixed to the top surface of the rotating base 6, and a lower cover plate 8 fixed to the bottom surface of the rotating base 6. The center of the fixed frame 2 has a central hole for the rotating seat 6 to pass through. The motor is bolted to the fixed frame 2. The upper half of the outer circular wall of the rotating seat 6 is connected to the bearing in the central hole. The lower half of the outer circular wall of the rotating seat 6 is fitted with a gear ring 15, which meshes with a gear. The gear pin is fixed to the main shaft of the motor.

[0043] Specifically, such as Figure 2 and Figure 4 As shown, when it is necessary to drive the vertical tube 3 to rotate axially, the motor can be powered on and run. The motor can drive the gear to rotate, and the gear can drive the gear ring 15 to rotate axially through meshing. The gear ring 15 can drive the rotating seat 6 to rotate on the fixed frame 2. In this scheme, four vertical tubes 3 are set. In order for the rotating seat 6 to drive the vertical tube 3 to rotate 90° stably in one go, the motor here can be a stepper motor with a step angle of 1.8°. With the stepper driver and controller, after receiving the trigger signal, the controller outputs 50 pulses to the driver. The motor stops immediately after rotating 90°. The stepper motor has a built-in shaft lock to keep the position from rebounding.

[0044] In one specific embodiment of the present invention, such as Figure 7 As shown, the rotating base 6 is annular in shape, and multiple grooves 9 arranged in a ring are formed on the surface of the rotating base 6. The bottom of the grooves 9 is provided with a hole 10, and the bottom end of the hole 10 is connected to the bottom surface of the rotating base 6. like Figures 6-7 As shown, a sleeve 11 is inserted into the groove 10 and fixedly connected thereto. A fixing ring 12 is integrally formed at the top of the sleeve 11. Multiple through holes 13 distributed in a ring are opened on the wall of the sleeve 11 at the plane position of the groove 9.

[0045] The bottom end of the vertical tube 3 passes through the upper cover plate 7 and is inserted into the sleeve 11. The outer diameter of the vertical tube 3 is smaller than the inner diameter of the sleeve 11. Both the top and bottom ends of the vertical tube 3 are open. The outer wall of the vertical tube 3 and the inner circular wall of the fixing ring 12 are provided with mutually mating threads. The horizontal plane at the bottom end of the vertical tube 3 is above the horizontal plane at the bottom end of the sleeve 11. A conical block 14 is provided directly below the bottom end of the vertical tube 3. The conical block 14 is fixedly installed on the lower cover plate 8. Vertical tube 3 is installed vertically and is made of non-metallic material.

[0046] Specifically, such as Figures 5 to 7 As shown, the sleeve 11 and the groove 9 can form an annular flow guide cavity. When the airflow enters the flow guide cavity, it will enter the interior of the sleeve 11 through multiple through holes 13. Since there is a gap between the inner wall of the sleeve 11 and the outer wall of the vertical pipe 3, this gap forms an annular columnar airflow channel, and the airflow can evenly fill the airflow channel.

[0047] Furthermore, since the top of the sleeve 11 is integrally formed with a fixing ring 12, the outer wall of the vertical tube 3 and the inner circular wall of the fixing ring 12 are connected by threads, and the horizontal plane at the bottom of the vertical tube 3 is above the horizontal plane at the bottom of the sleeve 11, there is also a gap between the bottom of the sleeve 11 and the bottom of the vertical tube 3. In this way, the airflow can enter the interior of the vertical tube 3 through the gap, and under the action of the conical block 14, the radial airflow coming up through the gap can be smoothly guided into a uniform axial upward flow, eliminating vortices and dead zones at the gap, and allowing the entire cross section inside the vertical tube 3 to form a stable and symmetrical upward flow field.

[0048] This flow field can support the neotame powder, allowing the powder to suspend, fall, and suspend again within the sleeve 11, passing through the high-sensitivity central area of ​​the annular coil multiple times, thoroughly breaking up the powder clumps, exposing the encapsulated metal particles, and improving inspection sensitivity.

[0049] During feeding, a small amount of powder will enter the airflow channel mentioned above through the gap between the bottom end of the sleeve 11 and the bottom end of the vertical pipe 3. When the high-speed airflow flows in the airflow channel, it will blow this part of the powder back into the vertical pipe 3, which can effectively avoid blockage.

[0050] The vertical tube 3 and the fixing ring 12 are connected by threads. This not only allows for fine adjustment of the gap between the bottom end of the vertical tube 3 and the bottom end of the sleeve 11, which is beneficial for controlling the size of the airflow channel formed at the bottom end of the vertical tube 3, but also facilitates adjustment of the airflow channel size according to the actual detection needs of neuraminidide particles of different sizes. In addition, the vertical tube 3 as a whole can be disassembled and replaced, which is convenient for cleaning and maintenance.

[0051] In one specific embodiment of the present invention, such as Figures 5-7As shown, the pneumatic mechanism includes a flow divider 17 disposed on the inner circle of the rotating base 6. The bottom end of the flow divider 17 is open, and an air inlet pipe 16 is connected to the bottom end of the flow divider 17 through a rotary joint. The bottom end of the air inlet pipe 16 passes through the lower cover plate 8 and extends out of the outer shell 1. Multiple diversion pipes 18 are welded and connected on the outer circular wall of the diversion shroud 17. One end of the diversion pipe 18 passes through the rotating seat 6 and extends into the groove 9.

[0052] Specifically, such as Figure 3 and Figure 6 As shown, the intake pipe 16 is connected to an external air source to deliver pulsed airflow. The pulsed airflow can be delivered through the intake pipe 16 to the flow divider 17, then split into multiple flow dividers 18, and finally the gas is sent into the groove 9.

[0053] Each branch pipe 18 is equipped with a solenoid valve, which controls the opening and closing of the branch pipe 18.

[0054] The flow divider 17 and the air inlet pipe 16 are designed to be movable, so that the pulsed airflow can flow normally when the flow divider 17 rotates with the rotating seat 6, ensuring the normal operation of the equipment. In addition, the flow divider 17 and the air inlet pipe 16 adopt a balanced mechanical seal structure, which can achieve effective air sealing under rotation conditions.

[0055] In one specific embodiment of the present invention, such as Figures 8-9 As shown, the sealing mechanism includes a nut sleeve 19, with an integrally formed collar 20 fitted on the outer wall of the bottom end of the nut sleeve 19. An integrally formed sealing plug 21 is connected to the bottom surface of the collar 20. The sealing plug 21 has a circular cross-section, and its inner diameter is larger than that of the collar 20. The outer diameter of the sealing plug 21 is the same as that of the inner diameter of the vertical pipe 3.

[0056] The lifting mechanism includes a lead screw 23 and a connecting plate 24 fixedly connected to the outer circular wall of the collar 20. The top end of the lead screw 23 passes through the outer shell 1 and is connected to the bearing of the outer shell 1. The bottom end of the lead screw 23 passes through the nut sleeve 19 and is threadedly connected to the nut sleeve 19. The bottom end face of the lead screw 23 is fixedly connected to the sealing plate 22. The sealing plate 22 is a circular plate with a diameter equal to or slightly smaller than the inner diameter of the collar 20.

[0057] The bottom end of the connecting plate 24 is fixedly connected to the outer shell of the electromagnetic detection sensor 4. A guide post 25 runs through the connecting plate 24, and the top end of the guide post 25 is welded and fixed to the inner wall of the outer shell 1.

[0058] Specifically, such as Figure 2 , Figure 8 and Figure 9 As shown, a servo motor is connected to the top of the lead screw 23, which is used to drive the lead screw 23 to rotate in both directions.

[0059] The two connecting plates 24 are connected as one unit by the collar 20. Under the action of the guide post 25, the whole unit can move vertically. Therefore, under the restriction of the guide post 25, the nut sleeve 19 can only move vertically.

[0060] When the vertical tube 3 containing powder rotates to the bottom of the sealing mechanism, the servo motor drives the lead screw 23 to rotate clockwise. The lead screw 23 drives the nut sleeve 19 to move downward. The nut sleeve 19 drives the sealing plug 21 to move downward synchronously through the collar 20. During the downward movement, the sealing plug 21 extends into the inner wall of the top of the vertical tube 3, and the outer wall of the sealing plug 21 is in contact with the inner wall of the vertical tube 3 until the collar 20 is in contact with the end face of the vertical tube 3.

[0061] Throughout the descent of the nut sleeve 19, the sealing plate 22 remains below the nut sleeve 19. When the collar 20 comes into contact with the end face of the vertical tube 3, the bottom end of the nut sleeve 19 comes into contact with the upper end face of the sealing plate 22. Due to the presence of the sealing plate 22, the gap between the nut sleeve 19 and the lead screw 23 is blocked by the sealing plate 22. Furthermore, the sealing plate 22, together with the sealing plug 21 and the collar 20, forms a "cap"-like structure that can seal the top end of the sleeve 3, preventing powder from overflowing.

[0062] When the connecting plate 24 moves, it can drive the electromagnetic detection sensor 4 to move synchronously, so that the electromagnetic detection sensor 4 passes through the vertical pipe 3, thus enabling the electromagnetic detection sensor 4 to detect metals in the powder.

[0063] When the servo motor drives the lead screw 23 to rotate counterclockwise, it can reset the nut sleeve 19 and the electromagnetic detection sensor 4, so that the vertical tube 3 can continue to rotate to complete the unloading operation.

[0064] In one specific embodiment of the present invention, the docking assembly includes a movable tube 28, a second abutting ring 30 integrally formed with the outer wall of the movable tube 28, and a third abutting ring 31 integrally formed with the inner wall of the movable tube 28. The top end of the movable tube 28 extends into the discharge tube 5. The inner diameter of the movable tube 28 is the same as the outer diameter of the vertical tube 3. A first abutting ring 29, which mates with the second abutting ring 30, is integrally formed on the inner wall of the discharge tube 5. The movable tube 28 passes through the lifting plate 32 and is fixedly connected to the lifting plate 32. One side of the lifting plate 32 is slidably connected to the inner wall of the outer shell 1.

[0065] Specifically, such as Figure 2 and Figure 10As shown, the docking assembly also includes an electric push rod, which is set on the inner wall of the outer shell 1. The output end of the electric push rod docks with the lifting plate 32. When the vertical tube 3 rotates to below the discharge tube 5, the electric push rod pushes the lifting plate 32 downward. The lifting plate 32 slides downward on the inner wall of the outer shell 1. The lifting plate 32 drives the movable tube 28 to move synchronously. The bottom end of the movable tube 28 can be fitted onto the top end of the vertical tube 3, and the third clamping ring 31 abuts against the top end face of the vertical tube 3.

[0066] At the same time, the second clamping ring 30 and the first clamping ring 29 clamp each other, thus achieving a seal at the connection between the movable pipe 28 and the discharge pipe 5, as well as a seal at the connection between the movable pipe 28 and the vertical pipe 3. The pneumatic mechanism delivers pulsating airflow. After the airflow enters the vertical pipe 3, it can lift the powder and carry the powder through the movable pipe 28 into the discharge pipe 5, where it is finally collected.

[0067] In one specific embodiment of the present invention, the centerlines of the two discharge pipes 5, the guide hopper 27, and the sealing plug 21 are parallel to each other, and the centerlines of the four are arranged in a circular array along the centerline of the rotating seat 6. The centerlines of multiple vertical tubes 3 are parallel to each other, and the centerlines of multiple vertical tubes 3 are distributed in a circular array along the centerline of the rotating seat 6. Specifically, through the above-mentioned arrangement, when the multiple vertical pipes 3 are driven by the rotating seat 6 to perform circular motion, the vertical pipes 3 can rotate sequentially to below the discharge pipe 5, the movable pipe 28 and the sealing plug 21, thereby facilitating the sealing operation of the vertical pipes 3, as well as the feeding and discharging operations.

[0068] In one specific embodiment of the present invention, the components in the sealing mechanism and the docking assembly are preferably made of food-grade polyoxymethylene material, which does not cause secondary pollution and ensures food safety.

[0069] This invention also discloses a detection method for a high-sensitivity metal detection device used in neotame production, characterized by the following steps: S1. The feeding mechanism quantitatively delivers the material to be tested into the corresponding vertical pipe 3; S2, the vertical pipe 3 rotates to below the sealing mechanism under the drive of the rotating mechanism; S3, the sealing mechanism and the electromagnetic detection sensor 4 begin to descend under the drive of the lifting mechanism. The sealing mechanism seals the top of the vertical tube 3, and the electromagnetic detection sensor 4 is sleeved on the outside of the vertical tube 3. S4. The material in the vertical pipe 3 rises and is fed continuously under the action of the pneumatic mechanism, and the electromagnetic detection sensor 4 detects the material in motion. S5. After the test is completed, the sealing mechanism and the electromagnetic detection sensor 4 move upward to reset, and the vertical tube 3 continues to rotate under the drive of the rotating mechanism. S6. When no metal is detected, the vertical pipe 3 rotates to the bottom of the first discharge pipe 5. The discharge pipe 5 is connected to the vertical pipe 3 through the docking assembly. The pneumatic mechanism blows the material out through the discharge pipe 5 for centralized collection. When metal is detected, the vertical pipe 3 rotates to the bottom of the second discharge pipe 5. The discharge pipe 5 connects with the vertical pipe 3 through the docking assembly. The pneumatic mechanism blows the material out through the discharge pipe 5 for centralized collection and metal rejection.

[0070] In the description of this specification, terms such as "connection," "installation," and "fixation" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms within this invention based on the specific circumstances.

[0071] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-sensitivity metal detection device for neotame production, comprising a housing (1), a plurality of vertical tubes (3) located within the housing (1), and a feeding mechanism for conveying materials. Its features are: A fixing frame (2) is provided on the inner wall of the outer shell (1). A rotating mechanism for driving multiple vertical tubes (3) to perform circular motion is provided on the fixing frame (2). A pneumatic mechanism for blowing air to the bottom of the vertical tubes (3) is provided on the rotating mechanism. The outer casing (1) is equipped with a sealing mechanism for sealing the top of the vertical tube (3). An electromagnetic detection sensor (4) for metal detection is located directly below the sealing mechanism. The outer casing (1) is also equipped with a lifting mechanism for driving the sealing mechanism and the electromagnetic detection sensor (4) to move vertically. The top wall of the outer shell (1) has two discharge pipes (5) running through it, and the bottom end of the discharge pipe (5) is provided with a docking assembly for connecting with the top end of the vertical pipe (3).

2. The high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The feeding mechanism includes a feeding device (26), one end of which extends out of the outer shell (1). A guide hopper (27) is provided below the discharge port of the feeding device (26), and the guide hopper (27) is fixed to the inner wall of the outer shell (1) by welding metal parts.

3. The high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The rotating mechanism includes a rotating seat (6), an upper cover plate (7) fixed to the top surface of the rotating seat (6), and a lower cover plate (8) fixed to the bottom surface of the rotating seat (6). The fixed frame (2) has a central hole for the rotating seat (6) to pass through. The fixed frame (2) is bolted to a motor. The upper half of the outer circular wall of the rotating seat (6) is connected to the central hole bearing. The lower half of the outer circular wall of the rotating seat (6) is fitted with a gear ring (15). The gear ring (15) meshes with a gear. The gear pin is fixed to the main shaft of the motor.

4. The high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The rotating base (6) is annular, and a plurality of annularly distributed grooves (9) are formed on the surface of the rotating base (6). The bottom of the grooves (9) is provided with holes (10), and the bottom end of the holes (10) is connected to the bottom surface of the rotating base (6). A sleeve (11) is inserted into the groove (10) and fixedly connected thereto. A fixing ring (12) is integrally formed at the top of the sleeve (11). Multiple through holes (13) are provided on the wall of the sleeve (11) at the plane position of the groove (9).

5. A high-sensitivity metal detection device for neotame production according to claim 4, characterized in that: The bottom end of the vertical tube (3) passes through the upper cover plate (7) and is inserted into the sleeve (11). The outer diameter of the vertical tube (3) is smaller than the inner diameter of the sleeve (11). The top and bottom ends of the vertical tube (3) are open. The outer wall of the vertical tube (3) and the inner circular wall of the fixing ring (12) are provided with mutually matching threads. The horizontal plane at the bottom end of the vertical tube (3) is above the horizontal plane at the bottom end of the sleeve (11). A conical block (14) is provided directly below the bottom end of the vertical tube (3). The conical block (14) is fixedly installed on the lower cover plate (8). The vertical tube (3) is set vertically and is made of non-metallic material.

6. The high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The pneumatic mechanism includes a flow divider (17) disposed on the inner circle of the rotating base (6). The bottom end of the flow divider (17) is open. An air inlet pipe (16) is connected to the bottom end of the flow divider (17) through a rotary joint. The bottom end of the air inlet pipe (16) passes through the lower cover plate (8) and extends out from the outer shell (1). Multiple diversion pipes (18) are welded and connected on the outer circular wall of the diversion shroud (17). One end of the diversion pipe (18) passes through the rotating seat (6) and extends into the groove (9).

7. A high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The sealing mechanism includes a nut sleeve (19), and a collar (20) integrally formed therewith is fitted on the outer wall of the bottom end of the nut sleeve (19). A sealing plug (21) integrally formed therewith is connected to the bottom surface of the collar (20). The cross-section of the sealing plug (21) is circular. The inner diameter of the sealing plug (21) is larger than the inner diameter of the collar (20). The outer diameter of the sealing plug (31) is consistent with the inner diameter of the vertical pipe (3).

8. A high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The lifting mechanism includes a lead screw (23) and a connecting plate (24) fixedly connected to the outer circular wall of the collar (20). The top end of the lead screw (23) passes through the outer shell (1) and is connected to the bearing of the outer shell (1). The bottom end of the lead screw (23) passes through the nut sleeve (19) and is threadedly connected to the nut sleeve (19). The bottom end face of the lead screw (23) is fixedly connected to the sealing plate (22). The sealing plate (22) is a circular plate with a diameter equal to or slightly smaller than the inner diameter of the collar (20). The bottom end of the connecting plate (24) is fixedly connected to the outer shell of the electromagnetic detection sensor (4), and a guide post (25) runs through the connecting plate (24). The top end of the guide post (25) is welded and fixed to the inner wall of the outer shell (1).

9. A high-sensitivity metal detection device for neotame production according to claim 1, characterized in that: The docking assembly includes a movable tube (28), a second abutting ring (30) integrally formed with the outer wall of the movable tube (28), and a third abutting ring (31) integrally formed with the inner wall of the movable tube (28). The top of the movable tube (28) extends into the discharge tube (5). The inner diameter of the movable tube (28) is the same as the outer diameter of the vertical tube (3). The inner wall of the discharge tube (5) is integrally formed with a first abutting ring (29) that cooperates with the second abutting ring (30). The movable tube (28) passes through the lifting plate (32) and is fixedly connected to the lifting plate (32). One side of the lifting plate (32) is slidably connected to the inner wall of the outer shell (1).

10. A detection method using a high-sensitivity metal detection device for neotame production as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. The feeding mechanism quantitatively delivers the material to be tested into the corresponding vertical pipe (3); S2, the vertical pipe (3) rotates to below the sealing mechanism under the drive of the rotating mechanism; S3, the sealing mechanism and the electromagnetic detection sensor (4) begin to descend under the drive of the lifting mechanism. The sealing mechanism seals the top of the vertical tube (3), and the electromagnetic detection sensor (4) is sleeved on the outside of the vertical tube (3). S4. The material in the vertical pipe (3) rises and is fed continuously under the action of the pneumatic mechanism, and the electromagnetic detection sensor (4) detects the material in motion. S5. After the test is completed, the sealing mechanism and the electromagnetic detection sensor (4) move upward to reset, and the vertical tube (3) continues to rotate under the drive of the rotating mechanism. S6. When no metal is detected, the vertical pipe (3) rotates to the bottom of the first discharge pipe (5), the discharge pipe (5) is connected to the vertical pipe (3) of the docking assembly, and the pneumatic mechanism blows the material out through the discharge pipe (5) for centralized collection. When metal is detected, the vertical tube (3) rotates to the bottom of the second discharge tube (5), and the discharge tube (5) is connected to the vertical tube (3) of the docking assembly. The pneumatic mechanism blows the material out through the discharge tube (5) for centralized collection and metal rejection.

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