A metal foreign body monitoring mechanism for a rubber conveyor belt

Abstract

The invention relates to the technical field of abnormal product rejection of production lines, and discloses a metal foreign body monitoring mechanism for a rubber conveyor belt, which solves the problem that, in the process of rejecting foreign bodies, products thrown out from the end of a conveyor belt within a period of time will fall into a collection frame for collecting unqualified products, resulting in a large proportion of qualified products in the frame, which is not conducive to subsequent sorting. Products thrown out from the conveyor belt transmission end are guided by a first bottom plate to the inner side of a rejection groove, and then guided by a rejection groove outlet to the upper side of a second bottom plate to slide down; when metal foreign bodies enter the rejection groove cavity, a rejection roller is controlled to rotate, so that the rejection groove outlet is downward, the rejection groove inlet is misaligned with the first bottom plate, and products sliding down through the surface of the first bottom plate are temporarily accumulated at the lower end, and the rejection groove only discharges metal foreign bodies and products in the cavity, thereby reducing the proportion of normal products discharged together with metal foreign bodies, which is convenient for subsequent sorting.

Description

Technical Field

[0001] The invention relates to the technical field of abnormal product rejection of a production line, and in particular to a metal foreign body monitoring mechanism for a rubber conveyor belt. Background Art

[0002] The conveyor belt metal foreign body monitoring mechanism consists of a detection device, a conveyor belt and a rejection device. The detection device includes X-ray detection or electromagnetic induction detection. The conveyor belt metal detection mechanism usually adopts a "mouth"-shaped or channel-shaped detection device, and the conveyor belt passes through the inside of the detection device; when the product passes through the detection area on the conveyor belt, the detection device will detect it. If metal foreign bodies are detected, the system will remove the unqualified products from the conveyor belt through the rejection device;

[0003] The rejection device includes a flap-type rejection device, which is commonly used for bulk products (such as nuts, peanuts, etc.). It is composed of flaps set at the end of the conveyor belt and controlled by the system to flip up and down at both ends. When unqualified products containing metal foreign matter fall onto the flap surface, the system controls the flap to flip so that the end originally on the upper side is downward, so as to guide the unqualified products into another collection frame;

[0004] Among them, when the unqualified products are removed by rotating the flap, in addition to removing the qualified products on the board at the same time, during the same period of rotation of the flap, the products thrown out from the end of the conveyor belt will also be guided by the flap and fall into another collection frame for collecting unqualified products. Therefore, in addition to the products on the board, some qualified products on the conveyor belt will also be introduced into the above-mentioned collection frame, which makes the proportion of qualified products in the collection frame large, causing inconvenience for the subsequent secondary sorting. Summary of the invention

[0005] The purpose of the present invention is to provide a metal foreign body monitoring mechanism for a rubber conveyor belt, which solves the problem that when a flap-type rejection device of a conventional metal foreign body monitoring mechanism is rejecting foreign bodies, the products thrown out from the end of the conveyor belt within the same period of time will fall into a collection frame for collecting unqualified products, resulting in a large proportion of qualified products in the frame, which is not conducive to subsequent sorting.

[0006] To achieve the above object, the present invention provides the following technical solutions: a metal foreign body monitoring mechanism for a rubber conveyor belt, comprising a frame, a conveyor belt and a detection unit are mounted on the frame, a rejection mechanism for rejecting metal foreign bodies is provided at the conveying end of the conveyor belt, and the rejection mechanism and the detection unit are cooperatively controlled by a control system;

[0007] The rejection mechanism includes a first bottom plate and a second bottom plate which are fixedly mounted on the conveying end of the conveyor belt and are arranged in sequence. The first bottom plate and the second bottom plate are arranged at an inclination on the same plane. A rotating rejection roller is installed between the first bottom plate and the second bottom plate. The arc surface of the rejection roller is provided with a rejection groove which penetrates to the other side. Under normal circumstances, the products thrown out from the conveying end of the conveyor belt are guided by the first bottom plate to the inside of the rejection groove, and then guided by the rejection groove outlet to the upper side of the second bottom plate to slide down. When metal foreign matter enters the inside of the rejection groove, the rejection roller is controlled to rotate so that the rejection groove outlet is downward, and the rejection groove entrance is offset from the first bottom plate.

[0008] As a further description of the above technical solution: a plurality of partitions are provided above the conveyor belt along its conveying direction, a collecting bucket for collecting metal foreign matter is provided directly below the rejection mechanism, the partitions and the collecting bucket are fixedly mounted on the frame, and the rejection mechanism is provided with a plurality of partitions corresponding to the partitions.

[0009] As a further description of the above technical solution: the rejection mechanism also includes a connecting plate correspondingly mounted on one end of the partition, and the connecting plate is provided with a mounting seat for rotatably assembling the rejection roller, and the first bottom plate and the second bottom plate are fixedly assembled between two adjacent connecting plates.

[0010] As a further description of the above technical solution: the rejection roller is provided with rotating shafts at both ends along the axial direction for rotationally assembling with the mounting seat, and the rejection roller is also fixedly provided with a gear ring A along one side of the axial direction. The mounting seat is provided with a control motor that drives the rejection roller to rotate, and the output end of the control motor is meshed with the gear ring A through gear A.

[0011] As a further description of the above technical solution: the inclined surfaces of the first bottom plate and the second bottom plate pass through the axis of the connecting plate, and one side of the lower bottom surface of the rejection groove is connected to the second bottom plate, or the other side of the lower bottom surface of the rejection groove is connected to the first bottom plate.

[0012] As a further description of the above technical solution: the top surface and the bottom surface of the rejection groove are both provided with rubber pads, and when the rubber pad is located at the bottom, it is close to the first bottom plate.

[0013] As a further description of the above technical solution: a rotating squeezing roller is provided on the side of the rubber pad away from the rejection groove, the squeezing roller is assembled inside the rejection roller, and the squeezing roller is used to push the upper rubber pad to bulge toward the inner side of the rejection groove.

[0014] As a further description of the above technical solution: the squeezing roller includes an eccentrically rotated assembly mounted on one side of the rubber pad through an assembly frame, and a coil spring and a gear B are provided at one end of the rotating shaft of the squeezing roller. The coil spring is used to keep the squeezing roller supported on one side of the rubber pad without contact under normal conditions. The squeezing roller also includes an arc-shaped rack fixedly mounted on the mounting seat. When the gear B moves in a circular motion with the rejection roller, the arc-shaped rack is movably meshed with the gear B and causes the gear B to rotate half a circle. The side surface of the rejection roller is provided with an arc-shaped groove for avoiding the arc-shaped rack.

[0015] As a further description of the above technical solution: the outer arc surface portion of the removal roller is configured as an arc-shaped feeding cover, and a feeding groove is provided on the surface of the feeding cover.

[0016] As a further description of the above technical solution: the control system includes a frame selection unit, a calculation unit and a control unit. The frame selection unit frames and marks the metal foreign matter based on the metal foreign matter detected by the detection unit. The calculation unit calculates the time it takes for the metal foreign matter to arrive in the rejection slot cavity based on the transmission speed of the conveyor belt, and controls the motor through the control unit to rotate the rejection roller to a corresponding angle.

[0017] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the products thrown out from the end of the conveyor belt are guided by the first bottom plate to the inner side of the rejection slot, and then guided by the rejection slot outlet to the upper side of the second bottom plate to slide down; when metal foreign matter enters the rejection slot cavity, the rejection roller is controlled to rotate so that the rejection slot outlet is downward, the rejection slot inlet is misaligned with the first bottom plate, and the products sliding down the surface of the first bottom plate are temporarily accumulated at the lower end, and the rejection slot only discharges metal foreign matter and products in the cavity, thereby reducing the proportion of normal products discharged together with metal foreign matter, which is convenient for later sorting; at the same time, in response to multiple metal foreign matter close to each other, the rotation process of the rejection roller is controlled twice, and when the metal foreign matter is satisfied, the rejection roller is rotated twice. While guiding the first metal foreign body into the collection bucket, the subsequent metal foreign bodies that are closer can also be guided into the collection bucket at the same time; and the rejection roller is also equipped with a rubber pad and an extrusion roller that cooperates with the rubber pad, which can avoid the product jumping to the upper surface of the second bottom plate during the continuous rejection of multiple metal foreign bodies, resulting in the rejection process of the rejection roller being not accurate enough; at the same time, through the setting of the feeding cover, the products gathered at the root position of the first bottom plate can also be transferred to the second bottom plate, avoiding excessive accumulation of products at the root position of the first bottom plate; based on the above settings, the metal foreign body monitoring mechanism of the conveyor belt can achieve more accurate rejection tasks when detecting metal foreign bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the left side structure of the rejection mechanism of the present invention;

[0020] Figure 3 For the present invention Figure 2 A is an enlarged schematic diagram;

[0021] Figure 4 It is a schematic diagram of the right side structure of the rejection mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the exploded structure of the rejection mechanism of the present invention;

[0023] Figure 6 It is a schematic diagram of the blown-up structure of the rejecting roller of the present invention;

[0024] Figure 7 It is a plane schematic diagram of the rejection mechanism of the present invention in a normal state;

[0025] Figure 8 It is a schematic diagram of the state of the rejecting mechanism of the present invention rejecting foreign matter;

[0026] Fig. 9 It is a schematic diagram of the state in which the rejecting mechanism of the present invention continuously rejects foreign matter;

[0027] Fig.10 It is a schematic diagram of a plurality of metal foreign bodies arranged continuously in the present invention;

[0028] Fig.11 It is a schematic diagram of the control system program of the present invention.

[0029] In the figure: 10, frame; 11, detection unit; 12, conveyor belt; 13, partition; 14, collecting bucket; 20, rejecting mechanism; 21, connecting plate; 211, first bottom plate; 212, second bottom plate; 22, rejecting roller; 221, rejecting groove; 222, gear ring A; 223, rotating shaft; 224, arc groove; 225, feeding cover; 226, rubber pad; 23, control motor; 231, gear A; 24, mounting seat; 25, squeezing roller; 251, assembly frame; 252, coil spring; 253, gear B; 254, arc rack. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0032] Combination Figure 1-Figure 11A metal foreign body monitoring mechanism for a rubber conveyor belt comprises a frame 10, a conveyor belt 12 and a detection unit 11 are mounted on the frame 10, the detection unit 11 detects metal foreign bodies on products conveyed on the conveyor belt 12, the detection unit 11 is preferably an X-ray detection or an electromagnetic induction detection, a rejection mechanism 20 for rejecting metal foreign bodies is arranged at the conveying end of the conveyor belt 12, and the rejection mechanism 20 and the detection unit 11 are cooperatively controlled by a control system;

[0033] A plurality of partitions 13 are arranged above the conveyor belt 12 along its conveying direction, and a collecting bucket 14 for collecting metal foreign matter is arranged directly below the rejecting mechanism 20. The partitions 13 and the collecting bucket 14 are fixedly assembled on the frame 10, and a plurality of rejecting mechanisms 20 are arranged corresponding to the partitions 13. The upper surface of the conveyor belt 12 is divided into a plurality of conveying channels by the partitions 13, and a plurality of rejecting mechanisms 20 are arranged correspondingly at the ends of the conveying channels. When metal foreign matter is detected in a part of the conveying channels by the detection unit 11, the rejecting mechanism 20 corresponding to the conveying channels implements targeted metal foreign matter rejection, thereby further reducing the proportion of normal products discharged together with metal foreign matter;

[0034] Combination Figure 1-Figure 6 The rejecting mechanism 20 includes a connecting plate 21 correspondingly mounted on one end of the partition 13, and a mounting seat 24 for rotatably mounting a rejecting roller 22 is provided on the connecting plate 21; it also includes a first bottom plate 211 and a second bottom plate 212 fixedly mounted on the conveying end of the conveyor belt 12 and arranged in sequence, the first bottom plate 211 and the second bottom plate 212 are fixedly mounted between two adjacent connecting plates 21, the first bottom plate 211 and the second bottom plate 212 are arranged in an inclined manner on the same plane, a rotating rejecting roller 22 is arranged between the first bottom plate 211 and the second bottom plate 212, and a rejecting groove 221 is provided on the arc surface of the rejecting roller 22 that penetrates to the other side. The products ejected from the conveying end of the conveyor belt 12 are normally guided by the first bottom plate 211 to the inner side of the rejecting groove 221, and then guided by the outlet of the rejecting groove 221 to slide down the upper side of the second bottom plate 212, the products slide down from the upper surface of the second bottom plate 212, and a collection frame is provided on one side for collection;

[0035] When the metal foreign matter enters the cavity of the rejection groove 221, the rejection roller 22 is controlled to rotate so that the outlet of the rejection groove 221 is downward, and the inlet of the rejection groove 221 is misaligned with the first bottom plate 211. The products sliding down the surface of the first bottom plate 211 will be temporarily accumulated at the foot of the first bottom plate 211. The rejection groove 221 only discharges the metal foreign matter and products in the cavity, thereby reducing the proportion of normal products discharged together with the metal foreign matter, which is convenient for later sorting;

[0036] The two ends of the rejecting roller 22 along the axial direction are respectively provided with a rotating shaft 223 for rotating and assembling with the mounting seat 24. A gear ring A222 is also fixedly provided on one side of the rejecting roller 22 along the axial direction. A control motor 23 that drives the rejecting roller 22 to rotate is provided on the mounting seat 24. The output end of the control motor 23 is meshed with the gear ring A222 through a gear A231. The control motor 23 is controlled by the control system telecommunication to further control the rotation angle of the rejecting roller 22. Figure 4 As shown, in order to make the control motor 23 have a certain installation height, a plurality of driven gears can be added between the gear A231 and the gear ring A222 to mesh with each other, so as to prevent the installation position of the control motor 23 from affecting the normal flow of products between two adjacent connecting plates 21.

[0037] like Figure 7-Figure 9 As shown, the first bottom plate 211 and the second bottom plate 212 have inclined surfaces passing through the axis of the connecting plate 21 , and one side of the lower bottom surface of the rejection groove 221 is connected to the second bottom plate 212 , or the other side of the lower bottom surface of the rejection groove 221 is connected to the first bottom plate 211 .

[0038] Under normal conditions, one side of the lower bottom surface of the rejection groove 221 is connected to the second bottom plate 212, and the products sliding down from the surface of the first bottom plate 211 can still enter the inner side of the rejection groove 221 and slide out smoothly through the surface of the second bottom plate 212. Figure 7 As shown by the dotted line in the middle, when there is a metal foreign body entering the cavity of the rejection groove 221, the rejection roller 22 is controlled to rotate 180 degrees quickly. During the process, only the metal foreign body in the cavity of the rejection groove 221 is discharged from the outlet together with the product and discharged into the collection bucket 14. During the same period of time, the normal products sliding down the first bottom plate 211 will be collected on the lower side of the first bottom plate 211 (such as Figure 8 The dotted line in the middle shows that this prevents the normal products from being misled into the collecting hopper 14;

[0039] When the detection unit 11 detects that there are at least two relatively close metal foreign objects in a transmission channel (such as Fig.10 As shown in FIG. 2 ), when the first metal foreign body enters the inner side of the rejection groove 221, the rejection roller 22 is first controlled to rotate rapidly so that one side of the rejection groove 221 is connected to the first bottom plate 211 (as shown in FIG. 2 ). Fig. 9 As shown in FIG. 1 ), the other side of the rejection groove 221 has an opening downwardly leading to the collection bucket 14, so that while the first metal foreign body is guided into the collection bucket 14, the subsequent metal foreign bodies that are closer can also be guided into the collection bucket 14 (as shown in FIG. Fig. 9 As shown by the dashed line in the middle, as the last metal foreign body in the arrangement enters the rejection groove 221, the rejection roller 22 is controlled to continue to rotate so that one side of the lower bottom surface of the rejection groove 221 is restored to dock with the second bottom plate 212, and the sum of the above two rotation angles is 180°.

[0040] like Figure 2-Figure 3 , Figure 6As shown, rubber pads 226 are provided on the top and bottom surfaces of the rejection groove 221. When the rubber pad 226 is located at the bottom, it is close to the first bottom plate 211. When the product on the first bottom plate 211 enters the rejection groove 221, it will preferentially impact the surface of the rubber pad 226. The rubber pad 226 can appropriately offset the impact force of the product to prevent the product from bouncing inside the rejection groove 221. This effectively prevents the product from jumping to the upper surface of the second bottom plate 212 when the rejection groove 221 is used to continuously remove multiple close-range metal foreign objects, resulting in the rejection of multiple metal foreign objects by the rejection groove 221. Inaccurate.

[0041] like Figure 2-Figure 3 , Figure 6 As shown, a rotating squeezing roller 25 is provided on the side of the rubber pad 226 away from the rejecting groove 221. The squeezing roller 25 is assembled inside the rejecting roller 22. The squeezing roller 25 is used to push the upper rubber pad 226 to bulge inside the rejecting groove 221.

[0042] The squeezing roller 25 includes an eccentrically rotating assembly on one side of the rubber pad 226 through an assembly frame 251. A coil spring 252 and a gear B253 are provided at one end of the rotating shaft of the squeezing roller 25. The coil spring 252 is used to keep the squeezing roller 25 supported on one side of the rubber pad 226 without contacting it under normal conditions. The squeezing roller 25 also includes an arcuate rack 254 fixedly assembled on the mounting seat 24. The arcuate rack 254 is movably meshed with the gear B253 when the gear B253 moves in a circle with the removal roller 22, and causes the gear B253 to rotate half a circle. An arcuate groove 224 is provided on the side surface of the removal roller 22 to avoid the arcuate rack 254.

[0043] Further, such as Figure 2-Figure 3 , Figure 7 , Fig. 9 As shown, when the removal roller 22 is in the initial state, the arc-shaped rack 254 is fixedly assembled on one side of the upper gear B253; in the process of the removal groove 221 continuously removing multiple metal foreign objects, the removal roller 22 will first rotate for the first time to separate the removal groove 221 from the second bottom plate 212, wherein the gear B253 moves circumferentially around the axis of the removal roller 22, and is actively meshed with the arc-shaped rack 254, causing the squeezing roller 25 to rotate half a circle, and further causing the top surface of the squeezing roller 25 to rotate to the surface of the lower squeezing rubber pad 226, causing the upper rubber pad 226 to protrude toward the inner side of the removal groove 221 (as shown in FIG. Fig. 9 As shown), the upper rubber pad 226 protrudes to the arc surface inside the removal groove 221. In the process of the removal groove 221 continuously removing multiple metal foreign objects, the connection port between the removal groove 221 and the upper area of ​​the second bottom plate 212 has a partition effect, which can further prevent the product from jumping to the upper surface of the second bottom plate 212, resulting in the removal of multiple metal foreign objects by the removal groove 221. The removal is not accurate enough.

[0044] like Figure 5 , Figure 6 As shown, the outer arc surface portion of the rejection roller 22 is configured as an arc-shaped feed cover 225, and a feed groove is provided on the surface of the feed cover 225. When the rejection roller 22 rotates through the rejection groove 221 to remove metal foreign matter, the products sliding down the surface of the first bottom plate 211 will be gathered at the root position. Through the provision of the feed cover 225, this part of the products can be transferred to the second bottom plate 212, thereby avoiding excessive gathering of products at the root position of the first bottom plate 211.

[0045] like Fig.10 , Fig.11 As shown, the control system includes a frame selection unit, a calculation unit and a control unit. The frame selection unit marks the metal foreign matter based on the metal foreign matter detected by the detection unit 11. The calculation unit calculates the time when the metal foreign matter reaches the cavity of the rejection slot 221 based on the conveying speed of the conveyor belt 12, and controls the control motor 23 through the control unit to rotate the rejection roller 22 to a corresponding angle.

[0046] Specifically, the area of ​​the frame mark is equal to the area of ​​the bottom surface of the reject slot 221 cavity, wherein the metal foreign matter is centered in the frame mark along the conveying direction, and the distance from the metal foreign matter to the edge of the frame mark is a, and the calculation unit measures the time difference, and when the frame mark overlaps with the bottom surface of the reject slot 221 cavity, the reject roller 22 is controlled to rotate;

[0047] Among them, for at least two relatively close metal foreign bodies in a transmission channel, the distance between two adjacent metal foreign bodies is b. When the time for the metal foreign body to move a length of ba is less than or equal to the time for the rejection roller 22 to rotate half a circle, the formula is: (ba) / v1≤πr / v2

[0048] Among them, v1 is the conveying speed of the conveyor belt 12, v2 is the arc surface rotation speed of the removal roller 22, and r is the radius length of the removal roller 22. When the above conditions are met, the control system controls the removal roller 22 to rotate according to the above two times, so that the removal roller 22 can perform the task of continuously removing multiple metal foreign objects.

[0049] Working principle: The product thrown out from the end of the conveyor belt 12 is guided by the first bottom plate 211 to the inside of the rejection slot 221, and then guided by the outlet of the rejection slot 221 to slide down the upper side of the second bottom plate 212. When the detection unit 11 detects one or more continuous metal foreign bodies, the frame selection unit marks them. For multiple continuous metal foreign bodies, the distance between two adjacent metal foreign bodies is also measured. Then, the calculation unit calculates the time when the metal foreign body arrives in the cavity of the rejection slot 221, and cooperates to control the rotation of the rejection roller 22. In the process of rejecting a metal foreign body, the rejection roller 22 is controlled to rotate. 2 quickly rotates 180°, and the rejection groove 221 only discharges the metal foreign bodies in the cavity together with the products into the collection bucket 14; and for multiple consecutive metal foreign body rejections, when the first metal foreign body enters the inner side of the rejection groove 221, the rejection roller 22 is first controlled to rotate quickly so that one side of the rejection groove 221 is docked with the first bottom plate 211, so that the other side of the rejection groove 221 has an opening downwardly leading to the collection bucket 14, and after the last metal foreign body in the arrangement enters the rejection groove 221, the rejection roller 22 is controlled to continue rotating so that the rejection groove 221 and the second bottom plate 212 resume docking;

[0050] Among them, through the rubber pad 226 on the inner side of the rejection groove 221, and the cooperation between the rubber pad 226 and the extrusion roller 25, it is possible to avoid the product jumping to the upper surface of the second bottom plate 212 during the continuous removal of multiple metal foreign objects, making the removal process of the removal roller 22 more accurate; through the setting of the feeding cover 225, the products gathered at the root position of the first bottom plate 211 can be transferred to the second bottom plate 212, avoiding excessive accumulation of products at the root position of the first bottom plate 211.

[0051] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal foreign body monitoring mechanism for a rubber conveyor belt, comprising a frame (10), a conveyor belt (12) and a detection unit (11) being mounted on the frame (10), characterized in that: A rejection mechanism (20) for rejecting metallic foreign matter is provided at the conveying end of the conveyor belt (12), and the rejection mechanism (20) and the detection unit (11) are cooperatively controlled by a control system; The rejecting mechanism (20) comprises a first bottom plate (211) and a second bottom plate (212) which are fixedly mounted on the conveying end of the conveyor belt (12) and are arranged in sequence. The first bottom plate (211) and the second bottom plate (212) are arranged to be inclined in the same plane. A rotating rejecting roller (22) is arranged between the first bottom plate (211) and the second bottom plate (212). The arc surface of the rejecting roller (22) is provided with a rejecting groove (221) which penetrates to the other side. Under normal conditions, the product ejected from the conveying end of the conveyor belt (12) is guided by the first bottom plate (211) to the inside of the rejecting groove (221), and then guided by the outlet of the rejecting groove (221) to the upper side of the second bottom plate (212) and slides down. When a metal foreign body enters the inside of the rejecting groove (221), the rejecting roller (22) is controlled to rotate so that the outlet of the rejecting groove (221) is downward and the inlet of the rejecting groove (221) is offset from the first bottom plate (211). The top and bottom surfaces of the rejection groove (221) are both provided with a rubber pad (226); a rotating squeezing roller (25) is provided on the side of the rubber pad (226) away from the rejection groove (221); the squeezing roller (25) is eccentrically rotated and assembled on one side of the rubber pad (226) via an assembly frame (251); a coil spring (252) and a gear B (253) are provided on one end of the rotating shaft of the squeezing roller (255); the coil spring (252) is used to keep the squeezing roller (25) supported on one side of the rubber pad (226) in a normal state. The squeezing roller (25) further comprises an arc-shaped rack (254) fixedly mounted on the mounting seat (24), wherein the arc-shaped rack (254) is movably meshed with the gear B (253) when the gear B (253) moves in a circular motion with the rejecting roller (22), and causes the gear B (253) to rotate half a circle, and the squeezing roller (25) is used to push the upper rubber pad (226) to protrude toward the inner side of the rejecting groove (221), thereby isolating the connection between the rejecting groove (221) and the upper area of ​​the second bottom plate (212).

2. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 1, characterized in that: A plurality of partitions (13) are provided above the conveyor belt (12) along its conveying direction, and a collecting bucket (14) for collecting metallic foreign matter is provided directly below the rejecting mechanism (20). The partitions (13) and the collecting bucket (14) are both fixedly mounted on the frame (10), and the rejecting mechanism (20) is provided with a plurality of partitions (13) corresponding to the partitions (13).

3. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 2, characterized in that: The rejecting mechanism (20) further comprises a connecting plate (21) correspondingly mounted on one end of the partition plate (13), the connecting plate (21) being provided with a mounting seat (24) for rotatably mounting a rejecting roller (22), and the first bottom plate (211) and the second bottom plate (212) being fixedly mounted between two adjacent connecting plates (21).

4. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 3, characterized in that: The rejecting roller (22) is provided with rotating shafts (223) at both ends along the axial direction for rotationally assembling with the mounting seat (24), and a gear ring A (222) is fixedly provided on one side along the axial direction of the rejecting roller (22). The mounting seat (24) is provided with a control motor (23) for driving the rejecting roller (22) to rotate, and the output end of the control motor (23) is meshed with the gear ring A (222) via a gear A (231).

5. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 2, characterized in that: The inclined surfaces of the first bottom plate (211) and the second bottom plate (212) pass through the axis of the connecting plate (21), and one side of the lower bottom surface of the rejection groove (221) is butted against the second bottom plate (212), or the other side of the lower bottom surface of the rejection groove (221) is butted against the first bottom plate (211).

6. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 5, characterized in that: When the rubber pad (226) is located at the bottom, it is close to the first bottom plate (211).

7. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 6, characterized in that: The squeezing roller (25) is mounted inside the rejecting roller (22).

8. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 7, characterized in that: The side surface of the removal roller (22) is provided with an arc-shaped groove (224) for avoiding the arc-shaped rack (254).

9. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 1, characterized in that: The outer arc surface portion of the rejection roller (22) is configured as an arc-shaped feeding cover (225), and a feeding groove is provided on the surface of the feeding cover (225).

10. A metal foreign body monitoring mechanism for a rubber conveyor belt according to claim 1, characterized in that: The control system comprises a frame selection unit, a calculation unit and a control unit. The frame selection unit performs frame selection marking on the metal foreign matter based on the metal foreign matter detected by the detection unit (11). The calculation unit calculates the time it takes for the metal foreign matter to arrive in the cavity of the rejection slot (221) based on the conveying speed of the conveyor belt (12), and controls the control motor (23) through the control unit to rotate the rejection roller (22) to a corresponding angle.

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