A rapid detection device for metal foreign objects in food
By introducing a conveying and separating mechanism and magnetic field detection technology into the food testing device, rapid detection and automated separation of metallic foreign objects have been achieved, solving the problems of production line interruption and manual handling, and improving production efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 朱菲菲
- Filing Date
- 2025-06-18
- Publication Date
- 2026-05-26
AI Technical Summary
Existing food inspection devices cause frequent production line interruptions when detecting metal foreign objects, reducing production efficiency, increasing labor costs, posing a risk of secondary contamination, and failing to achieve automated sorting and processing.
A rapid detection device was designed, comprising a conveyor belt separation mechanism, a transmitting coil, and a receiving coil. The device uses a servo motor to control the speed of the conveyor belt, a magnetic field to detect metallic foreign objects, and an automated separation arm to ensure uninterrupted detection.
It enables efficient detection and automated diversion of metallic foreign objects, improves production continuity, reduces the cost of manual intervention and the risk of secondary pollution, and enhances detection accuracy and automation.
Smart Images
Figure CN224272263U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of food foreign object detection technology, and in particular relates to a rapid detection device for metal foreign objects in food. Background Technology
[0002] During food processing and production, metallic foreign objects may enter food due to wear and tear on processing equipment, contamination of raw materials, or oversights in the packaging process. These foreign objects not only damage the quality of food but may also pose serious health risks to consumers, such as digestive tract damage and organ dysfunction. Therefore, efficient and accurate detection of metallic foreign objects in food is a crucial step in ensuring food safety.
[0003] However, existing detection devices have significant shortcomings in their detection processes: when the detection system detects metallic foreign objects, the common approach is to stop the conveyor mechanism, manually locate and remove the foreign object. This approach not only leads to frequent production line interruptions, reducing production efficiency and increasing labor costs, but also risks missed detection due to positional shifts during shutdown, or introduces secondary contamination risks due to manual operation. Furthermore, traditional detection devices have relatively simple food conveying path planning, failing to achieve automated classification and processing of food in different states after detection (qualified products and products containing foreign objects), thus failing to meet the high-speed and intelligent production demands of the modern food industry.
[0004] Therefore, it is essential to invent a rapid detection device for metallic foreign objects in food. Utility Model Content
[0005] To address the aforementioned technical problems, this utility model provides a rapid detection device for metal foreign objects in food, comprising a frame, conveyor side plates, a conveyor channeling mechanism, conveyor rollers, a conveyor belt, a channel frame, a receiving coil, a mounting plate, a transmitting coil, and a servo motor. Two conveyor side plates are fixedly and mirror-symmetrically mounted on the top of the frame. A conveyor channeling mechanism is fixedly mounted in the middle section of the two conveyor side plates. Conveyor belts are mounted on conveyor rollers rotatably mounted at both ends of the two conveyor side plates. One end of one of the conveyor rollers rotatably passes through one of the conveyor side plates and is fixed to the output end of a servo motor fixedly mounted outside that conveyor side plate. A channel frame, a receiving coil, and a mounting plate are fixedly mounted at the front section of the two conveyor side plates. A transmitting coil is fixedly mounted on both mounting plates. The channel frame, receiving coil, and transmitting coil are arranged on the same vertical line.
[0006] Preferably, the conveying and separating mechanism includes a support frame, a support arm, a separating seat, a separating arm, a drive shaft, and a drive component. The support frame is fixedly installed in the middle of the two conveying side plates. The separating seat is fixedly installed on the support frame via the support arm. The separating seat is located on one side of the separating arm. The upper end of the drive shaft fixedly installed on the separating arm rotates through the support frame and is fixed to the output end of the drive component fixedly installed on the support frame.
[0007] Preferably, the guide seat and guide arm are located above the conveyor belt, wherein the guide seat is located above the middle of the rear section of the conveyor belt, and the guide arm is located above the middle section of the conveyor belt.
[0008] Preferably, the front end of the dividing arm faces two symmetrically arranged channel frames, and the two channel frames are respectively fixedly connected to the inner side of the corresponding conveyor side plate, forming a detection channel between the two channel frames, and the channel frames are located above the front section of the conveyor belt.
[0009] Preferably, the outer side of the channel frame is fixedly installed on the inner side of the conveyor side plate by bolts. The transmitting coil is located directly above the two channel frames, while the receiving coil is located directly below them. The receiving coil is located on the inner side of the front section of the conveyor belt. The magnetic field areas of the receiving coil and the transmitting coil completely cover the detection channel between the two channel frames. The two channel frames are located above the front section of the conveyor belt and are spaced apart.
[0010] Preferably, the guide seat above the middle of the rear section of the conveyor belt, together with the conveyor side plates on both sides, forms two symmetrical separation channels. Food in the detection channel formed between the two channel frames is allowed to be guided and conveyed to the two different separation channels by the guide arm.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] This utility model's production line interruption avoidance device features a conveyor channeling mechanism (including a channeling seat, a channeling arm, and a drive component) that can plan the food's path before inspection. If a metallic foreign object is detected during inspection, the food containing the foreign object can be guided to a specific separating channel via the movement of the channeling arm without stopping the machine, achieving automated separation of qualified and defective products. Compared to traditional manual handling methods, this significantly improves production continuity and reduces the cost of manual intervention and the risk of secondary contamination.
[0013] The transmitting coil and receiving coil of this invention are respectively positioned directly above and below the detection channel, forming a detection magnetic field that vertically penetrates the conveyor belt, effectively improving the detection sensitivity and identification accuracy of metallic foreign objects. Combined with the stable control of the conveyor belt speed by a servo motor, this ensures that food undergoes comprehensive detection during uniform conveying, avoiding missed detections due to speed fluctuations.
[0014] This utility model features a precise diversion guide seat located above the middle of the rear section of the conveyor belt, forming two parallel dividing channels with the side conveyor plates on both sides. The diversion arm is located above the middle section and faces the detection channel, precisely guiding the inspected food to the corresponding dividing channel. This design achieves seamless integration of the detection process and diversion treatment, allowing food containing foreign objects to be processed separately without affecting the normal production rhythm, significantly improving the automation level and practicality of the detection system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0016] Figure 2 This is a partial cross-sectional structural diagram of the present invention.
[0017] Figure 3 This is a schematic diagram of the conveying and separating mechanism of this utility model.
[0018] In the picture:
[0019] Frame 1, conveyor side plate 2, conveyor channeling mechanism 3, support frame 31, support arm 32, channeling seat 33, channeling arm 34, drive shaft 35, drive component 36, conveyor roller 4, conveyor belt 5, channel frame 6, receiver coil 7, mounting plate 8, transmitter coil 9, servo motor 10. Detailed Implementation
[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.
[0022] As attached Figure 1 To be continued Figure 3 As shown:
[0023] This utility model provides a rapid detection device for metal foreign objects in food, comprising a frame 1, conveyor side plates 2, a conveyor channeling mechanism 3, conveyor rollers 4, conveyor belts 5, a channel frame 6, a receiver coil 7, a mounting plate 8, a transmitter coil 9, and a servo motor 10. Two conveyor side plates 2 are fixedly and mirror-symmetrically mounted on the top of the frame 1, and the conveyor channeling mechanism 3 is fixedly mounted on the middle section of the two conveyor side plates 2. The conveyor rollers 4 rotatably mounted at both ends of the two conveyor side plates 2 are equipped with conveyor belts 5. One end of one of the conveyor rollers 4 rotatably passes through one of the conveyor side plates 2 and is fixed to the output end of the servo motor 10 fixedly mounted on the outside of the conveyor side plate 2. The channel frame 6, the receiver coil 7, and the mounting plate 8 are fixedly mounted on the front section of the two conveyor side plates 2, and the transmitter coil 9 is fixedly mounted on the two mounting plates 8.
[0024] Furthermore, the conveying and separating mechanism 3 includes a support frame 31, a support arm 32, a separating seat 33, a separating arm 34, a drive shaft 35, and a drive component 36. The support frame 31 is made of bent stainless steel plate and is symmetrically fixed to the middle section of the two conveying side plates 2 by bolts. At least one L-shaped support arm 32 extends outward from the middle of the support frame 31, and the end of the support arm 32 is fixedly connected to the top surface of the separating seat 33 by countersunk bolts. The separating seat 33 is an inverted trapezoidal stainless steel frame structure, with a gap between its bottom surface and the surface of the conveyor belt 5, preventing them from contacting each other. The separating arm 34 is a guide plate made of food-grade polyoxymethylene (POM) material. One end of its center is connected to and fixed to the drive shaft 35 by a key. The upper end of the drive shaft 35 passes through a pre-set through hole in the support frame 31 and is rotated and supported by a deep groove ball bearing. The top end is fixedly connected to the output shaft of the drive component 36 (preferably a micro servo motor, model SM-08D) by a coupling.
[0025] Furthermore, both the guide seat 33 and the guide arm 34 are located directly above the conveyor belt 5. The guide seat 33 is located above the middle of the rear section of the conveyor belt 5 (near the discharge end), and its inverted trapezoidal structure forms two parallel dividing channels, each 150mm wide, with the bottom edge of the trapezoidal structure and the inner sidewalls of the two conveyor side plates 2. The guide arm 34 is installed above the middle section of the conveyor belt 5 (downstream of the detection channel) via the drive shaft 35, and its initial position is at an angle to the centerline of the conveyor belt 5.
[0026] Furthermore, the front end of the guide arm 34 is angled at 45°, precisely aligned with two symmetrically arranged channel frames 6. The channel frames 6 are welded from high-polymer plastic material and connected to the inner side of the conveyor side plate 2. The two channel frames 6 are arranged parallel to each other, forming a detection channel between them. The orthographic projection of this channel completely covers the running trajectory of the front section (detection area) of the conveyor belt 5. Driven by the drive component 36, the guide arm 34 can rotate ±30° around the drive shaft 35, thereby guiding the food conveyed to the middle section to the left or right.
[0027] Furthermore, the channel frame 6 is fixed to the inner surface of the conveyor side plate 2 with bolts. A transmitting coil 9 is fixedly installed above the two channel frames 6 via a mounting plate 8, and a receiving coil 7 is installed at the corresponding position below. The transmitting coil 9 adopts a hollow solenoid structure and is externally wrapped with an electromagnetic shielding layer. The receiving coil 7 is a ring-shaped induction coil, fixed to the conveyor side plate 2 at the front end of the conveyor belt 5 via a bracket, forming a perpendicular facing arrangement with the transmitting coil 9. The output end of the receiving coil 7 is connected to the signal processing module inside the conveyor side plate 2 via a shielded cable. The magnetic field regions of the receiving coil 7 and the transmitting coil 9 completely cover the detection channel between the two channel frames 6.
[0028] Furthermore, when the guide seat 33 located above the middle of the rear section of the conveyor belt 5 cooperates with the two side conveyor plates 2, its inverted trapezoidal structure divides the belt surface into two equal-width left and right partition channels. The width of a single channel can be adjusted by replacing the guide seat 33 with different specifications. After the food passes through the detection channel, the guide arm 34, controlled by the drive component 36, swings its angle according to the detection result (qualified / containing foreign objects): if the detection is qualified, the guide arm 34 maintains its initial angle, guiding the food into the left partition channel; if a metal foreign object is detected, the guide arm 34 rotates, guiding the problematic product to the right partition channel. The ends of the partition channels correspond to qualified product collection boxes and foreign object collection boxes, respectively, realizing automated classification and processing.
[0029] The working principle is as follows: First, the food is placed on the conveyor belt 5 at the front of the equipment. The servo motor 10 drives the conveyor roller 4 to move the conveyor belt 5 forward at a constant speed. When the food moves with the conveyor belt 5 to the space between the two channel frames 6 at the top of the front section, it enters the detection channel defined by the channel frames 6. At this time, the high-frequency alternating magnetic field generated by the transmitting coil 9 (located directly above the channel frame 6) penetrates vertically through the food in the detection channel, and the receiving coil 7 (located directly below the channel frame 6) collects the magnetic field signal in real time. If the food contains a metallic foreign object, its induced eddy current will cause magnetic field distortion. The receiving coil 7 will transmit the abnormal signal to the control system, triggering the foreign object identification logic.
[0030] The food that has completed the inspection continues to be conveyed backward along the conveyor belt 5. When it reaches the middle section, the guide arm 34 (installed above the middle section) adjusts the guide angle according to the inspection results: if the food is qualified, the guide arm 34 maintains the initial state and guides it to continue forward along one side of the conveyor belt 5; if a metal foreign object is detected, the control system sends a command to the drive component 36, and the guide arm 34 rotates around the drive shaft 35, guiding the problematic product to the other side of the conveyor belt 5.
[0031] Subsequently, the food enters the rear section, where the guide seat 33 (located in the upper middle of the rear section) and the two side conveyor plates 2 cooperate to form two parallel separating channels. Qualified products or products containing foreign objects, guided by the guide arm 34, enter the corresponding left or right separating channel, and finally fall from the end of the belt into the qualified product collection box or foreign object collection box below. Throughout the process, the conveyor belt 5 runs continuously without stopping. Through the coordinated work of the detection channel and the guide mechanism, online detection and automated diversion of metal foreign objects are achieved.
[0032] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.
Claims
1. A rapid detection device for metallic foreign objects in food, characterized in that, The system includes a frame (1), conveyor side plates (2), a conveyor channeling mechanism (3), conveyor rollers (4), a conveyor belt (5), a channel frame (6), a receiver coil (7), a mounting plate (8), a transmitter coil (9), and a servo motor (10). Two conveyor side plates (2) are fixedly mounted on the top of the frame (1) in a mirror-symmetrical manner. The conveyor channeling mechanism (3) is fixedly mounted on the middle section of the two conveyor side plates (2). The conveyor rollers (4) rotatably mounted at both ends of the two conveyor side plates (2) are equipped with conveyor belts (5). One end of one of the conveyor rollers (4) rotatably passes through one of the conveyor side plates (2) and is fixed to the output end of the servo motor (10) fixedly mounted on the outside of the conveyor side plate (2). The channel frame (6), the receiver coil (7), and the mounting plate (8) are fixedly mounted on the front section of the two conveyor side plates (2). The transmitter coil (9) is fixedly mounted on the two mounting plates (8). The channel frame (6), the receiver coil (7), and the transmitter coil (9) are arranged on the same vertical line.
2. The rapid detection device for metal foreign objects in food as described in claim 1, characterized in that: The conveying and separating mechanism (3) includes a support frame (31), a support arm (32), a separating seat (33), a separating arm (34), a drive shaft (35), and a drive component (36). The support frame (31) is fixedly installed in the middle of the two conveying side plates (2). The separating seat (33) is fixedly installed on the support frame (31) through the support arm (32). The separating seat (33) is located on one side of the separating arm (34). The upper end of the drive shaft (35) fixedly installed on the separating arm (34) rotates through the support frame (31) and is fixed to the output end of the drive component (36) fixedly installed on the support frame (31).
3. The rapid detection device for metal foreign objects in food as described in claim 2, characterized in that: The guide seat (33) and guide arm (34) are located above the conveyor belt (5), wherein the guide seat (33) is located above the middle of the rear section of the conveyor belt (5), and the guide arm (34) is located above the middle section of the conveyor belt (5).
4. The rapid detection device for metal foreign objects in food as described in claim 3, characterized in that: The front end of the dividing arm (34) faces two symmetrically arranged channel frames (6). The two channel frames (6) are respectively fixedly connected to the inner side of the corresponding conveyor side plate (2). A detection channel is formed between the two channel frames (6). The channel frames (6) are located above the front section of the conveyor belt (5).
5. The rapid detection device for metal foreign objects in food as described in claim 4, characterized in that: The outer side of the channel frame (6) is fixedly installed on the inner side of the conveyor side plate (2) by bolts. The transmitting coil (9) is located directly above the two channel frames (6), while the receiving coil (7) is located directly below them. The receiving coil (7) is located on the inner side of the front section of the conveyor belt (5). The magnetic field area of the receiving coil (7) and the transmitting coil (9) completely covers the detection channel between the two channel frames (6). The two channel frames (6) are located above the front section of the conveyor belt (5) and are spaced apart.
6. The rapid detection device for metal foreign objects in food as described in claim 5, characterized in that: The middle upper part of the rear section of the conveyor belt (5) is combined with the conveyor side plates (2) on both sides to form two symmetrical separation channels. Food in the detection channel formed between the two channel frames (6) is allowed to be guided and conveyed to the two different separation channels by the separation arm (34).