A tea leaf foreign matter recognition detection device

Abstract

The application provides a tea foreign matter recognition and detection device, and relates to the fields of tea processing and optical detection technology, and comprises a conveying belt assembly, a recognition unit, a rejection assembly and a foreign matter guide. The conveying belt is provided as a first part and a second part distributed upward and downward, and the end of the first part is longer than the start of the second part in the horizontal direction, so as to form a space region therebetween. After the tea leaves fall freely in a planar dispersed state from the end of the first part, the relative shielding relationship between the tea leaves continuously changes during the falling process, and the continuous scanning and recognition of the recognition unit greatly improves the exposure rate of foreign matters and effectively solves the missed detection problem caused by the shielding of stacked tea leaves in static detection. Moreover, the rejection direction of the rejection assembly is set as a direction opposite to the conveying direction, so as to fundamentally overcome the defect that foreign matters are easily mixed with qualified tea leaves again in the downstream conveying area in the existing forward or vertical rejection scheme.

Description

Technical Field

[0001] This invention relates to the field of tea processing and optical detection technology, specifically to a foreign object identification and detection device for tea. Background Technology

[0002] During the series of processing steps including picking, withering, rolling, fermentation, roasting, and packaging, tea is highly susceptible to the introduction of various foreign objects. Classified by physical characteristics, these mainly include: heavy particulate matter such as sand and metal shavings; transparent or translucent lightweight foreign matter such as plastic fragments and glass shards; fibrous or flaky organic matter such as tea stems, wood chips, and hair; and other impurities such as paper scraps and synthetic fibers. If these foreign objects remain in the finished tea product, they not only seriously affect the sensory quality and drinking safety of the tea, but may also cause food safety incidents, becoming a pressing quality control challenge for the tea processing industry.

[0003] Currently, several technical solutions have been proposed for the detection and removal of foreign objects in tea leaves. Classified by detection method, they mainly include two forms: static detection and dynamic detection during the falling process.

[0004] Static detection is a common method, where tea leaves are laid flat on the surface of a conveyor belt (or other carrier) and captured by a camera above. However, when tea leaves are laid flat, they inevitably overlap and obstruct each other. Tea leaves or foreign objects at the bottom cannot be effectively captured by the camera, resulting in a high rate of missed detections.

[0005] Dynamic detection during the falling process utilizes the dispersed state of the tea leaves as they detach from the conveyor belt, effectively reducing obstruction and increasing the exposure rate of foreign objects. However, dynamic detection during the falling process still faces significant challenges in practical applications: after detaching from the conveyor belt, tea leaves and foreign objects undergo projectile motion. Due to differences in density, weight, and friction coefficient with the conveyor belt surface, foreign objects with different physical properties have varying initial horizontal velocities—heavy foreign objects have an initial horizontal velocity close to the conveyor belt's linear velocity, flying farther and faster; while light foreign objects, due to poor adhesion and severe slippage, have an initial horizontal velocity much lower than the conveyor belt's speed, flying shorter and slower. This velocity difference leads to significant deviations in the falling positions of different foreign objects at the same moment. Existing detection and rejection structures typically identify and act with fixed positions and fixed time delays, making it difficult to accurately capture and reject various types of foreign objects, resulting in high rates of missed and false rejections. Furthermore, in other existing rejection schemes, the force direction of the rejection actuator is mostly along or perpendicular to the material conveying direction. After rejection, foreign objects may still fall into the downstream conveying area and mix again with qualified tea leaves. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a foreign object identification and detection device for tea leaves, which solves the technical problems of high false negative rates in static detection due to tea leaf stacking and obstruction, large deviations in removal positions due to differences in the initial horizontal velocity of foreign objects with different physical properties during dynamic detection during the falling process, and easy secondary mixing of foreign objects with qualified tea leaves after removal.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A foreign object detection device for tea leaves includes: A conveyor belt assembly, wherein the conveyor belt of the conveyor belt assembly includes a first part for conveying material in a first direction and a second part disposed below the first part and conveying material in the first direction, wherein the end of the first part is longer than the beginning end of the second part in the horizontal direction, so that a space region is formed between the lower part of the first part and the upper part of the second part; An identification unit is fixedly disposed near the end of the first part and is used to identify foreign objects such as tea leaves falling from the end of the first part. The removal component receives foreign object information from the identification unit and pushes the foreign object into the space area along a second direction, which is opposite to the first direction. A foreign object guide is provided inside the space area and above the second part; the foreign object guide cooperates with the second part that conveys materials along the first direction to guide the foreign object out from the side of the second part.

[0008] Preferably, the conveyor belt assembly includes: a frame, a power unit, and a conveyor belt; The frame includes a set of symmetrically arranged plate frames, with a conveying area formed between two of the plate frames; The two plate frames are rotatably connected by a first shaft member and a second shaft member distributed along a first direction, a third shaft member, a fourth shaft member, and a fifth shaft member distributed along the first direction and located below the first and second shaft members; the lower edge of the fifth shaft member is located above the upper edge of the fourth shaft member; The conveyor belt is circular and passes sequentially around the first shaft member, the second shaft member, the fifth shaft member, the fourth shaft member, and the third shaft member; The power component is used to drive any one or more of the first, second, fifth, fourth, and third shafts to rotate, thereby driving the conveyor belt to operate or directly driving the conveyor belt to operate.

[0009] Preferably, the front end of the plate frame is provided with an adjustment component that can be slidably adjusted along the first direction, and the fourth shaft is rotatably engaged with the movable plate of the adjustment component; The side of the plate frame is slidably provided with a connecting seat that slides along the first direction. The fifth shaft is rotatably connected to the connecting seat. When the connecting seat moves along the first direction and close to the fourth shaft, it is elastically blocked by an elastic blocking block.

[0010] Preferably, the power component includes: a transmission shaft and a drive motor. The transmission shaft is rotatably mounted between the two plate frames. A synchronous transmission belt is provided between the transmission shaft and the first shaft and the third shaft. A first gear is fixedly mounted on the side of the transmission shaft. The drive motor is fixedly mounted on the side of the plate frame, and a second gear is fixedly mounted on the output end of the drive motor. The first gear and the second gear mesh and transmit power.

[0011] Preferably, the foreign object guide includes an arc-shaped segment, both ends of which are fixedly connected to connecting side supports. The connecting side supports are fixedly connected to the plate frame, and the arc-shaped segment protrudes towards the inner direction of the spatial area.

[0012] Preferably, the rejection assembly includes: a side frame, one end of which is fixedly connected to a plate frame, and the other end of which is fixedly connected to a fixed shaft. The fixed shaft is parallel to a second shaft member, and a plurality of rotating members are rotatably connected to the fixed shaft. Magnetic plates are fixedly connected to the sides of the rotating members. A first bracket and a second bracket, parallel to the fixed shaft, are fixedly connected to the inner side of the side frame. The first and second brackets are close to the second shaft member. An attractive electromagnetic block corresponding to a magnetic plate on each rotating member is fixedly connected to the first bracket. A repulsive electromagnetic block corresponding to a magnetic plate on each rotating member is fixedly connected to the second bracket. The distance between the repulsive electromagnetic block and the magnetic plate is greater than the distance between the attractive electromagnetic block and the magnetic plate. At the same distance, the magnetic force of the repulsive electromagnetic block on the magnetic plate is greater than the magnetic force between the attractive electromagnetic block and the magnetic plate.

[0013] Preferably, it further includes: a controller, which is used to receive control signals from the identification unit and control the repulsive electromagnetic blocks and attractive electromagnetic blocks corresponding to the magnetic suction plates on one or more rotating parts to be energized for a predetermined time.

[0014] Preferably, a limiting plate is fixedly connected to the inner side of the side frame, which is parallel to the fixed axis, and the limiting plate is located on the side of the rotating member away from the second shaft.

[0015] Preferably, the bottom end of the rotating component is provided with a bent portion, and a push plate is fixedly installed on the bent portion.

[0016] Preferably, the identification unit is any one of an industrial camera, a line scan camera, or a hyperspectral camera.

[0017] This invention provides a foreign object identification and detection device for tea leaves. It has the following beneficial effects: 1. This invention configures a conveyor belt into two vertically distributed sections, with the end of the first section being longer than the beginning of the second section in the horizontal direction, creating a spatial region between them. Tea leaves detach from the end of the first section and fall freely in a dispersed, planar manner. The relative occlusion relationship between the tea leaves continuously changes during the fall. Combined with continuous scanning and identification by the recognition unit, this significantly improves the foreign object exposure rate and effectively solves the problem of missed detection caused by tea leaf stacking and occlusion in static detection.

[0018] 2. This invention sets the rejection direction of the rejection component to be opposite to the conveying direction. Combined with the containment function of the spatial area, this pushes foreign objects back into the spatial area below the first part, away from the normal conveying path of the second part. Simultaneously, a foreign object guide located within the spatial area guides the foreign objects out from the side of the second part, achieving complete separation of the foreign objects. This fundamentally overcomes the defect in existing forward or vertical rejection schemes where foreign objects easily fall into the downstream conveying area and mix with qualified tea leaves again.

[0019] 3. The rejection assembly of this invention employs a magnetic scheme driven by a combination of attractive and repulsive electromagnetic blocks. The attractive electromagnetic blocks utilize close-range magnetic attraction to achieve rapid acceleration and start-up of the rotating component, while the repulsive electromagnetic blocks utilize the rapidly increasing repulsive force that decreases with distance to achieve natural deceleration, braking, and reversal of the rotating component. The entire process requires no complex mechanical transmission mechanism, resulting in fast response and reliable operation. Simultaneously, a limiting plate restricts the return angle, ensuring the timing stability of adjacent actions and meeting the continuous detection requirements of high-speed production lines.

[0020] 4. This invention features an adjustable assembly that can slide along a first direction at the front end of the frame, which works in conjunction with the position adjustment of the fourth shaft. Simultaneously, a connecting seat and an elastic blocking block are slidably mounted on the side of the frame, allowing the fifth shaft to elastically tension the conveyor belt. This design, combining the adjustable assembly with the elastic tensioning structure, facilitates user adjustment of the extension length of the second part according to actual installation requirements, and automatically compensates for slack caused by long-term operation of the conveyor belt, ensuring the conveyor belt is always under appropriate tension and extending the equipment's service life.

[0021] 5. The rejection assembly of the present invention has several rotating parts rotatably connected on a fixed shaft. Each rotating part corresponds to an independent rejection area. The controller can select to drive one or more rotating parts to move according to the foreign object position information of the identification unit, so as to achieve precise fixed-point rejection of foreign objects in different positions, avoiding the waste of qualified tea caused by a single large-area rejection structure. It is suitable for the detection needs of different types of tea and foreign objects of different particle sizes. Attached Figure Description

[0022] Figure 1 This is a perspective view of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 2 This is a front view of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 3 This is a top view of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 4 This is a side view of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 5 This is a perspective view of the rejection component of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 6 This is a side view of the rejection component of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 7 for Figure 6 Cross-sectional view of section line AA in the middle; Figure 8 This is a three-dimensional view of the frame, power component, and conveyor belt of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 9 This is a three-dimensional view of the conveyor belt of a foreign object identification and detection device for tea leaves proposed in this invention; Figure 10 This is a three-dimensional view of the frame and power components of a foreign object identification and detection device for tea leaves proposed in this invention.

[0023] Among them, 1. Conveyor belt; 2. Frame; 3. Rejection assembly; 4. Identification unit; 5. Power component; 6. Foreign object guide; 101. First part; 102. Second part; 103. Spatial area; 201. Plate frame; 202. Third shaft; 203. Fourth shaft; 204. First shaft; 205. Second shaft; 206. Adjustment assembly; 2061. Movable plate; 207. Connecting seat; 208. Elastic blocking block; 2 09. Fifth shaft component; 301. Side frame; 302. Fixed shaft; 303. Rotating component; 3031. Bending part; 3032. Push plate; 3033. Magnetic suction plate; 304. First bracket; 305. Attracting electromagnetic block; 306. Second bracket; 307. Repulsive electromagnetic block; 308. Limiting plate; 501. Drive motor; 502. Second gear; 503. First gear; 504. Transmission shaft; 505. Synchronous transmission belt. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention. Example

[0025] like Figures 1-10 As shown, this embodiment of the invention provides a foreign object identification and detection device for tea, used to identify and remove foreign objects mixed in with tea during the tea conveying process; the device includes: a conveyor belt assembly, an identification unit 4, a removal assembly 3, and a foreign object guide 6.

[0026] Specifically, the conveyor belt 1 of the conveyor belt assembly includes a first part 101 that conveys materials in a first direction and a second part 102 that is disposed below the first part 101 and conveys materials in the first direction. The end of the first part 101 is longer than the beginning of the second part 102 in the horizontal direction, so that a space region 103 is formed between the bottom of the first part 101 and the top of the second part 102. It can be understood that the end of the first part 101 being longer than the beginning of the second part 102 in the horizontal direction can ensure that the tea products (hereinafter referred to as "materials" for convenience) conveyed from the end of the first part 101 fall on the second part 102 and continue to be conveyed along the second part 102 in the first direction. The material conveyed from the end of the first part 101 until it completely falls between the second part 102 is in a free and dispersed state. As time changes, the relative occlusion relationship between the materials will change. Continuous scanning and identification by the identification unit 4 can reduce the missed detection rate of foreign objects. The identification unit 4 can be any one of an industrial camera, a line scan camera, or a hyperspectral camera, preferably a high-definition industrial camera. The identification unit 4 is fixedly installed near the end of the first part 101. For example, it can be installed on the fixed part of the rejection component 3 to identify tea leaves falling from the end of the first part 101 for foreign object identification. The identification unit 4 sends the identified foreign object location information or the foreign object location information after prediction processing to the controller of the rejection component 3. After receiving the foreign object information from the identification unit 4, the rejection component 3 pushes the foreign object into the space area 103 along the second direction. The second direction is opposite to the first direction. It can be understood that the material is conveyed along the first direction with the first part 101. When the material flies out from the end of the first part 101, it has an initial velocity along the first direction. This initial velocity is affected by the weight of the material itself, the adhesion to the belt, and the coefficient of friction, and is difficult to predict. The rejection component 3 is designed to perform the rejection in the second direction, which is opposite to the first direction. This ensures that the action of the rejection component 3 will hit the foreign object (either at a predetermined position or before the predetermined position), avoiding the problem of foreign object rejection deviation. The design of the spatial region 103 makes the above-mentioned removal along the second direction more suitable. Inside the spatial region 103 and above the second part 102, a foreign object guide 6 is provided. The foreign object guide 6 cooperates with the second part 102, which conveys materials along the first direction, to guide the foreign object to be discharged from the side of the second part 102. For example, after the foreign object is pushed into the spatial region 103 by the removal component 3 and falls on the second part 102, the second part 102 continues to convey the foreign object along the first direction. At this time, the foreign object guide 6 tilts to block the foreign object and guides it to be discharged from the side of the second part 102, thereby realizing the identification and separation of foreign objects in the material.

[0027] It is understood that the conveyor belt 1 includes a first part 101 and a second part 102, and forms a spatial region 103 in the above distribution manner; wherein, the first part 101 and the second part 102 can be two independent or linked conveyor lines, or they can be two parts of a single conveyor line.

[0028] In one embodiment, the conveyor belt assembly includes: a frame 2, a power unit 5, and a conveyor belt 1; the frame 2 is used to support and guide the conveyor belt 1 so that it forms the first part 101, the second part 102, and the spatial region 103 as described above; the power unit 5 is used to drive the conveyor belt 1 to circulate.

[0029] The frame 2 includes a set of symmetrically arranged plate frames 201, forming a conveying area between the two plate frames 201, and the conveyor belt 1 is arranged in the conveying area; the two plate frames 201 are rotatably connected by a first shaft member 204 and a second shaft member 205 distributed along a first direction, a third shaft member 202 and a fourth shaft member 203 distributed along the first direction and located below the first shaft member 204 and the second shaft member 205, and a fifth shaft member 209; the lower edge of the fifth shaft member 209 is located above the upper edge of the fourth shaft member 203; the conveyor belt 1 is a ring and passes around the first shaft member 204, the second shaft member 205, the fifth shaft member 209, the fourth shaft member 203, and the third shaft member 202 in sequence.

[0030] It is understandable that after passing the first shaft member 204, the conveyor belt 1 moves along the first direction to the second shaft member 205, thus forming a first part 101 between the first shaft member 204 and the second shaft member 205; after passing the second shaft member 205, the conveyor belt 1 reverses direction and wraps around the fifth shaft member 209, and after passing the fifth shaft member 209, it moves along the first direction and wraps around the fourth shaft member 203, thus forming a second part 102 between the fifth shaft member 209 and the fourth shaft member 203, and at the same time, due to the inward guidance of the fifth shaft member 209, a spatial region 103 is formed.

[0031] The power unit 5 is used to drive any one or more of the following shafts—first shaft 204, second shaft 205, fifth shaft 209, fourth shaft 203, and third shaft 202—to rotate, thereby driving the conveyor belt 1 to operate or directly driving the conveyor belt 1 to operate. For example, a motor can be used to drive any one or more of the following shafts—first shaft 204, second shaft 205, fifth shaft 209, fourth shaft 203, and third shaft 202—to rotate. The directly driven part is the power roller shaft, which is used to drive the conveyor belt 1 to rotate cyclically. Of course, an additional power roller shaft can also be designed without changing the above distribution of the conveyor belt 1, and this additional power roller shaft can drive the conveyor belt 1 to rotate cyclically.

[0032] In one embodiment, the front end of the plate frame 201 is provided with an adjustment component 206 that can be slidably adjusted along a first direction, and the fourth shaft 203 is rotatably engaged with the movable plate 2061 of the adjustment component 206; the side of the plate frame 201 is slidably provided with a connecting seat 207 that is slidably engaged along the first direction, and the fifth shaft 209 is rotatably connected to the connecting seat 207. When the connecting seat 207 moves along the first direction and close to the fourth shaft 203, it is elastically blocked by the elastic blocking block 208.

[0033] Specifically, the adjustment assembly 206 includes a sliding rod arranged along a first direction, a movable plate 2061 that slides with the sliding rod, and a locking screw for locking the movable plate 2061 and the sliding rod. The user adjusts the position of the movable plate 2061 based on actual usage / installation needs, controlling the extension length of the end of the second part 102. Furthermore, the plate frame 201 has a main sliding hole on its side and auxiliary sliding holes distributed on both sides of the main sliding hole. Both the main sliding hole and the auxiliary sliding holes are arranged along the first direction. A connecting seat 207 is slidably arranged inside the main sliding hole. This connecting seat 207 can slide along the first direction, thereby allowing the adjustment to proceed along the first direction. The position of the fifth shaft 209 is adjusted by sliding in one direction. The elastic blocking block 208 is generally set inside the auxiliary sliding hole. The part of the connecting seat 207 that slides with the auxiliary sliding hole abuts against the end of the elastic blocking block 208. It can be understood that when the fourth shaft 203 is adjusted, the fifth shaft 209 will also be driven synchronously. The fifth shaft 209 and the connecting seat 207 slide in the first direction to squeeze the elastic blocking block 208, causing the elastic blocking block 208 to elastically contract. After the adjustment is completed, the elastic force of the elastic blocking block 208 causes the connecting seat 207 and the fifth shaft 209 to have a tendency to move in the opposite direction, so that the conveyor belt 1 is in a taut state.

[0034] In one embodiment, the power component 5 includes: a drive shaft 504 and a drive motor 501. The drive shaft 504 is rotatably mounted between two plate frames 201. A synchronous transmission belt 505 is provided between the drive shaft 504 and the first shaft member 204 and the third shaft member 202. A first gear 503 is fixedly mounted on the side of the drive shaft 504. The drive motor 501 is fixedly mounted on the side of the plate frame 201, and a second gear 502 is fixedly mounted on the output end of the drive motor 501. The first gear 503 and the second gear 502 mesh and transmit power.

[0035] An annular opening is designed at the location where the first shaft member 204 and the third shaft member 202 connect to the synchronous transmission belt 505. After the synchronous transmission belt 505 is arranged in the annular opening, the outer side of the synchronous transmission belt 505 contacts the inner wall of the conveyor belt 1. It can be understood that the drive motor 501 drives the second gear 502, the second gear 502 meshes with the drive shaft 504 and rotates synchronously. In the transmission system composed of the drive shaft 504, the first shaft member 204, the third shaft member 202 and the synchronous transmission belt 505, the drive shaft 504 is the power shaft, the first shaft member 204 and the third shaft member 202 are the driven members, and the synchronous transmission belt 505 rotates cyclically. When driving the conveyor belt 1, the first shaft member 204, the third shaft member 202 and the synchronous transmission belt 505 drive the conveyor belt 1 to rotate cyclically in sync.

[0036] In one embodiment, the foreign object guide 6 includes an arc-shaped segment, with connecting side supports fixedly connected to both ends of the arc-shaped segment. The connecting side supports are fixedly connected to the plate frame 201, and the arc-shaped segment protrudes towards the inner side of the spatial region 103. The foreign object is conveyed along the first direction on the second part 102. The foreign object is blocked by the protruding arc-shaped segment and slides along the arc-shaped segment to both sides, and the foreign object slides away from the second part 102 from the side.

[0037] In one embodiment, the rejection assembly 3 includes: a side frame 301, one end of which is fixedly connected to the plate frame 201, and the other end of which is fixedly connected to a fixed shaft 302. Two sets of side frames 301 are provided, distributed at both ends of the fixed shaft 302. The fixed shaft 302 is parallel to the second shaft member 205. A plurality of rotating members 303 are rotatably connected to the fixed shaft 302, each rotating member 303 corresponding to a rejection area. A magnetic suction plate 3033, which is a permanent magnet, is fixedly connected to the side of each rotating member 303. A first support 304, parallel to the fixed shaft 302, is fixedly connected to the inner side of the side frame 301. The second bracket 306, the first bracket 304, and the second bracket 306 are close to the second shaft 205. The first bracket 304 is fixedly connected to an attractive electromagnetic block 305 corresponding to the magnetic plates 3033 on each rotating component 303. The second bracket 306 is fixedly connected to a repulsive electromagnetic block 307 corresponding to the magnetic plates 3033 on each rotating component 303. The distance between the repulsive electromagnetic block 307 and the magnetic plates 3033 is greater than the distance between the attractive electromagnetic block 305 and the magnetic plates 3033. At the same distance, the magnetic force of the repulsive electromagnetic block 307 on the magnetic plates 3033 is greater than the magnetic force of the attractive electromagnetic block 305 on the magnetic plates 3033.

[0038] A controller is also designed to receive control signals from the identification unit 4 and control the repulsive electromagnetic block 307 and attractive electromagnetic block 305 corresponding to the magnetic suction plate 3033 on one or more rotating parts 303 to be energized for a predetermined time, the energizing time being 0.2s-0.8s.

[0039] Each rotating component 303 corresponds to a rejection area. The identification unit 4 identifies and determines / predicts the information of foreign objects. When a certain rejection area is identified, the corresponding rotating component 303 responds at a predetermined time. The response process of one of the rotating components 303 is analyzed in detail below: First, the repulsive electromagnetic block 307 and the magnetic suction plate 3033 are synchronously generated, producing a magnetic force. Since the distance between the attractive electromagnetic block 305 and the magnetic suction plate 3033 is less than the distance between the repulsive electromagnetic block 307 and the magnetic suction plate 3033, the attractive force between the attractive electromagnetic block 305 and the magnetic suction plate 3033 plays a dominant role in the movement of the rotating component 303. The rotating component 303 begins to accelerate its rotation, and as the rotating component 303 rotates, the magnetic suction plate 3033 on the rotating component 303 and the magnetic suction plate 3033 interact with the magnetic suction plate 303. The distance between electromagnetic block 305 and repulsive electromagnetic block 307 decreases; and the repulsive force of repulsive electromagnetic block 307 on magnetic suction plate 3033 on rotating part 303 increases even more, and the acceleration of rotating part 303 decreases. When the repulsive force of repulsive electromagnetic block 307 on magnetic suction plate 3033 on rotating part 303 becomes dominant, the speed of rotating part 303 reaches its maximum at this moment, and subsequent rotating parts 303 decelerate, the speed decreases to zero, and the rotation direction of subsequent rotating parts 303 changes. Rotating part 303 begins to rotate in the return direction; at this time, the preset time on the controller is reached, repulsive electromagnetic block 307 and attractive electromagnetic block 305 are de-energized at the same time, and rotating part 303 returns to its original position under the action of the above-mentioned return rotation speed and its own gravity.

[0040] In one embodiment, a limiting plate 308 is fixedly connected to the inner side of the side frame 301 and is arranged parallel to the fixed shaft 302. The limiting plate 308 is located on the side of the rotating member 303 away from the second shaft member 205. The limiting plate 308 can prevent the rotating member 303 from rotating too far backward during the above-mentioned return rotation, which would affect the next action. It can be understood that the time between two adjacent actions of the side frame 301 is 0.1s-0.5s.

[0041] In one embodiment, the bottom end of the rotating member 303 is provided with a bending portion 3031, and a pusher 3032 is fixedly installed on the bending portion 3031. The pusher 3032 is a part designed to push foreign objects. Of course, since the foreign objects are uncertain, the rotating member 303 is designed as a sheet to ensure the success rate of removing foreign objects.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foreign object identification and detection device for tea leaves, characterized in that, include: A conveyor belt assembly, wherein the conveyor belt (1) of the conveyor belt assembly includes a first part (101) for conveying material in a first direction and a second part (102) disposed below the first part (101) and for conveying material in the first direction, wherein the end of the first part (101) is longer than the beginning of the second part (102) in the horizontal direction, thereby forming a spatial region (103) below the first part (101) and above the second part (102). The identification unit (4) is fixedly installed near the end of the first part (101) and is used to identify the tea leaves falling from the end of the first part (101) for foreign object identification. The removal component (3) receives foreign object information from the identification unit (4) and pushes the foreign object into the space region (103) along a second direction, which is opposite to the first direction. A foreign object guide (6) is provided inside the space region (103) and above the second part (102); the foreign object guide (6) cooperates with the second part (102) that conveys materials along the first direction to guide the foreign object out from the side of the second part (102).

2. The foreign object identification and detection device for tea leaves according to claim 1, characterized in that, The conveyor belt assembly includes: a frame (2), a power unit (5), and a conveyor belt (1); The frame (2) includes a set of symmetrically arranged plate frames (201), and a conveying area is formed between the two plate frames (201); The two plate frames (201) are rotatably connected by a first shaft (204) and a second shaft (205) distributed along a first direction, a third shaft (202) and a fourth shaft (203) distributed along the first direction and located below the first shaft (204) and the second shaft (205), and a fifth shaft (209); the lower edge of the fifth shaft (209) is located above the upper edge of the fourth shaft (203); The conveyor belt (1) is a ring and passes around the first shaft (204), the second shaft (205), the fifth shaft (209), the fourth shaft (203), and the third shaft (202) in sequence. The power component (5) is used to drive any one or more of the first shaft (204), second shaft (205), fifth shaft (209), fourth shaft (203), and third shaft (202) to rotate, thereby driving the conveyor belt (1) to operate or directly driving the conveyor belt (1) to operate.

3. The foreign object identification and detection device for tea leaves according to claim 2, characterized in that: The front end of the plate frame (201) is provided with an adjustment component (206) that can be slidably adjusted along the first direction, and the fourth shaft (203) is rotatably engaged with the movable plate (2061) of the adjustment component (206); The side of the plate frame (201) is slidably provided with a connecting seat (207) that is slidably engaged in the first direction. The fifth shaft (209) is rotatably connected to the connecting seat (207). When the connecting seat (207) moves in the first direction and close to the fourth shaft (203), it is elastically blocked by the elastic blocking block (208).

4. The foreign object identification and detection device for tea leaves according to claim 2, characterized in that, The power component (5) includes: a transmission shaft (504) and a drive motor (501). The transmission shaft (504) is rotatably mounted between the two plate frames (201). A synchronous transmission belt (505) is provided between the transmission shaft (504) and the first shaft (204) and the third shaft (202). A first gear (503) is fixedly mounted on the side of the transmission shaft (504). The drive motor (501) is fixedly mounted on the side of the plate frame (201), and a second gear (502) is fixedly mounted on the output end of the drive motor (501). The first gear (503) and the second gear (502) mesh and transmit power.

5. The foreign object identification and detection device for tea leaves according to claim 2, characterized in that: The foreign object guide (6) includes an arc-shaped segment, both ends of which are fixedly connected to connecting side supports. The connecting side supports are fixedly connected to the plate frame (201), and the arc-shaped segment protrudes towards the inner side of the spatial region (103).

6. The foreign object identification and detection device for tea leaves according to claim 2, characterized in that, The rejection assembly (3) includes: a side frame (301), one end of which is fixedly connected to the plate frame (201), and the other end of which is fixedly connected to a fixed shaft (302). The fixed shaft (302) is parallel to the second shaft (205), and several rotating parts (303) are rotatably connected to the fixed shaft (302). A magnetic suction plate (3033) is fixedly connected to the side of the rotating part (303). A first bracket (304) and a second bracket (306) are fixedly connected to the inner side of the side frame (301) and are parallel to the fixed shaft (302). The first bracket (304) and the second bracket (306) are close to the... The second shaft (205) is fixedly connected to the first bracket (304) with an attractive electromagnetic block (305) corresponding to the magnetic suction plate (3033) on each rotating component (303), and the second bracket (306) is fixedly connected to a repulsive electromagnetic block (307) corresponding to the magnetic suction plate (3033) on each rotating component (303). The distance between the repulsive electromagnetic block (307) and the magnetic suction plate (3033) is greater than the distance between the attractive electromagnetic block (305) and the magnetic suction plate (3033). At the same distance, the magnetic force of the repulsive electromagnetic block (307) on the magnetic suction plate (3033) is greater than the magnetic force of the attractive electromagnetic block (305) and the magnetic suction plate (3033).

7. The foreign object identification and detection device for tea leaves according to claim 6, characterized in that, Also includes: The controller is used to receive the control signal sent by the identification unit (4) and control the repulsive electromagnetic block (307) and attractive electromagnetic block (305) corresponding to the magnetic suction plate (3033) on one or more rotating parts (303) to be energized for a predetermined time.

8. The foreign object identification and detection device for tea leaves according to claim 6, characterized in that: The inner side of the side frame (301) is fixedly connected to a limiting plate (308) arranged parallel to the fixed shaft (302), and the limiting plate (308) is located on the side of the rotating member (303) away from the second shaft member (205).

9. A foreign object identification and detection device for tea leaves according to claim 6, characterized in that: The bottom end of the rotating part (303) is provided with a bending part (3031), and a pusher (3032) is fixedly installed on the bending part (3031).

10. A foreign object identification and detection device for tea leaves according to claim 1, characterized in that: The identification unit (4) can be any one of an industrial camera, a line scan camera, or a hyperspectral camera.

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