Dust falling prevention device of drying oven feeding positioning platform

Abstract

The invention discloses a dust falling prevention device of a drying oven feeding positioning platform, and relates to the technical field of drying oven feeding platforms, the dust falling prevention device comprises a feeding platform, a plurality of bearing rollers are rotatably arranged between the inner walls of the two sides of the feeding platform, two positioning plates located above the bearing rollers are symmetrically distributed on the inner side of the feeding platform, and the dust falling prevention device further comprises a dustproof efficiency improving mechanism; through the arrangement of the suction part, when a device is stably conveyed along the feeding platform under precise limiting of the two positioning plates, a dust collector is started, strong suction force of the dust collector is conducted to a dust collection head through a pipeline, and at the moment, the dust collection head continuously forms a stable suction force field for the internal space of the feeding platform; when the device is driven by the bearing roller to slowly move to the position below the dust collection head, the suction force field can accurately act on the surface of the device, attached dust, chippings and other impurities are rapidly sucked away, and the suction removal part efficiently removes the impurities on the surface of the device through cooperative operation of the dust collector and the dust collection head.

Description

Technical Field

[0001] The invention relates to the technical field of oven feeding platforms, and in particular to a dust-falling prevention device for an oven feeding positioning platform. Background Art

[0002] In modern industrial production, tunnel ovens are widely used in pharmaceutical, electronics, food and other fields for material drying, sterilization, baking and other process treatments. The feed positioning platform is an important component of the tunnel oven. Its function is to accurately transport the material into the tunnel oven to ensure that the material can be evenly heated in the oven and ensure product quality.

[0003] At present, in order to prevent external dust, debris, etc. from entering the tunnel oven and affecting the baking quality of the materials, the existing technology usually adds a protective cover on the top of the feeding positioning platform of the tunnel oven. The protective cover can seal the top of the oven feeding positioning platform during the material conveying process, thereby relatively isolating the external dust, debris, etc., and reducing the pollution of the external environment to the material to a certain extent.

[0004] However, existing protective shields focus solely on isolating the external environment, resulting in significant technical deficiencies. They lack a mechanism or function to clean impurities from the material itself, making it impossible to remove impurities from the material before it is placed on the positioning platform. In actual production, dust, debris, and other impurities often adhere to the surface of materials during storage, transportation, or pre-processing. These impurities remain before the material enters the positioning platform. Once the impure material enters the tunnel oven, the impurities may undergo physical or chemical changes during the high-temperature baking process, affecting not only the material's appearance but also its physical and chemical properties, reducing product quality and even causing product failure. Summary of the Invention

[0005] In order to solve the above technical problems, a dust-falling prevention device for an oven feeding positioning platform is provided, which solves the problems existing in the background technology in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: a dust prevention device for an oven feed positioning platform, comprising a feed platform with an open top and connected to the oven, a plurality of supporting rollers rotatably arranged between the inner walls on both sides of the feed platform, two positioning plates symmetrically distributed on the inner side of the feed platform and located above the supporting rollers, and a dust prevention and efficiency improvement mechanism for improving the drying quality of the components;

[0007] The dust-proof and efficiency-enhancing mechanism mainly consists of a covering and protecting part for reducing the impact of external dust and impurities on the device, and a suction part for efficiently cleaning impurities carried by the device itself;

[0008] The covering and protecting portion is a dust cover plate, and the dust cover plate is hinged to the open end of the feeding platform;

[0009] The suction part includes a dust suction head transversely embedded in the inner wall of the dust cover and a dust collector installed on the top surface of the dust cover. The suction end of the dust collector is fixedly connected to the dust suction head through a dust suction pipe.

[0010] Preferably, the suction unit further includes a diameter adjustment component for adjusting the diameter of the dust collector head;

[0011] The diameter adjustment assembly includes two winding boxes with a cavity inside and symmetrically fixed to the bottom surface of the dust cover plate. The dust suction head is located between the two winding boxes. The suction end of the dust suction head slides symmetrically with two movable seats. The two movable seats correspond to the two winding boxes one by one, and the movable seats are connected to the winding boxes through a covering component.

[0012] Preferably, the covering member includes a winding rod that rotates laterally between the inner walls on both sides of the winding box and a plastic belt wrapped around the winding rod body, the end of the plastic belt passes through the winding box and is fixedly connected to the movable seat, and the part of the plastic belt located outside the winding box is in contact with the suction end of the vacuum cleaner head.

[0013] Preferably, a fixed sleeve is fixed to one side wall of the winding box, one end of the winding rod passes through the winding box and enters the fixed sleeve, and the rod body of the winding rod located in the fixed sleeve is provided with a torsion spring, and the two ends of the torsion spring are respectively fixedly connected to the fixed sleeve and the outer wall of the winding box.

[0014] Preferably, a sliding rod and a threaded rod are symmetrically distributed front and back between the two winding boxes, the rod body of the sliding rod is symmetrically slidably sleeved with two sliders, the two sliders are respectively fixedly connected to the two movable seats, and the rod body of the threaded rod is symmetrically threadedly sleeved with two nut seats, the two nut seats are respectively fixedly connected to the two movable seats.

[0015] Preferably, the diameter adjusting assembly further comprises a pressing member for improving the covering effect of the covering member;

[0016] The clamping member includes a clamping frame that is adapted to the shape of the open end of the vacuum cleaner head and slides under the plastic belt. An embedding frame is fixed to the top surface of the clamping frame. The open end of the vacuum cleaner head is provided with an embedding groove that is adapted to the embedding frame. Two longitudinal notches are symmetrically provided at the top of the movable seat, and the front and rear sides of the clamping frame slide in the two longitudinal notches respectively.

[0017] Preferably, connecting plates are fixed in the middle of the front and rear sides of the compression frame, a connecting rod is vertically fixed on the connecting plate, the end of the connecting rod passes through the dust cover, and a pressure plate is fixed between the ends of the two connecting rods, the rod body of the connecting rod is provided with a compression spring, and the two ends of the compression spring are respectively fixed to the pressure plate and the dust cover.

[0018] Preferably, a connecting plug is fixed to the top end of the positioning plate, and a connecting slot adapted to the connecting plug is provided at the bottom end of the movable seat.

[0019] Preferably, two movable rods in an eight-shaped shape are provided between the positioning plate and the inner side wall of the feeding platform, one end of the movable rod is hingedly connected to the positioning plate, and the other end of the movable rod is hingedly connected to a T-shaped block, and a sliding groove adapted to the T-shaped block is provided on the inner side wall of the feeding platform.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) Through the setting of the suction part, when the device is stably conveyed along the feeding platform under the precise limit of the two positioning plates, the vacuum cleaner is started, and its strong suction force is transmitted to the vacuum head through the pipe. At this time, the vacuum head continuously forms a stable suction force field on the internal space of the feeding platform. As the device slowly moves to the bottom of the vacuum head under the drive of the carrying roller, the suction force field can accurately act on the surface of the device, and quickly extract the attached dust, debris and other impurities. The suction part realizes the efficient removal of impurities on the surface of the device through the coordinated operation of the vacuum cleaner and the vacuum head, ensuring the cleanliness of the device entering the oven and improving the quality of subsequent drying processing.

[0022] (2) Through the setting of the diameter adjustment component, the two movable seats slide towards each other according to the size of the device to be dried, so that the distance between the two is accurately matched with the size of the device. During the sliding process of the movable seat, the movable seat stretches one end of the plastic belt, so that it continuously extends outward from the inside of the winding box, and simultaneously twists the torsion spring to provide tension for the plastic belt to ensure that it is always in a taut state. When the distance between the movable seats is reduced to adapt to small-sized materials, the winding box closes the excess open area of the vacuum head, so that the suction force is concentrated on the surface of the device, forming a local high-efficiency negative pressure environment. Compared with the traditional large-diameter vacuum head, this structure effectively reduces the area of ineffective suction.

[0023] (3) Through the setting of the clamping member, when the movable seat completes the sliding adjustment according to the size of the device, the operator releases the pressure plate. Under the action of the elastic force of the clamping spring, the pressure plate quickly moves up and resets, and drives the clamping frame and the embedding frame to rise together through the connecting rod. The embedding frame re-extrudes the edge of the plastic belt and embeds it tightly into the groove to form a sealing structure. Through this tight embedding fit, the gap between the plastic belt and the open mouth of the vacuum cleaner head is effectively filled, preventing airflow leakage during the vacuuming process and ensuring the stability of the negative pressure inside the vacuum cleaner head.

[0024] (4) By setting the connecting plug, when the dust cover is flipped over and the top of the feeding platform is closed, the connecting plug can be aligned and inserted into the connecting slot at the bottom of the movable seat, thereby connecting the positioning plate to the movable seat. Therefore, when the distance between the two movable seats is adjusted according to the size of the device to be processed, the positioning plate can move synchronously with the movable seat, thereby making the positioning plate suitable for contacting devices of different sizes, thereby enhancing applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the feeding platform of the present invention;

[0027] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0028] Figure 4 This is a schematic structural diagram of the diameter adjustment component of the present invention;

[0029] Figure 5 It is a schematic diagram of the internal structure of the winding box of the present invention.

[0030] The numbers in the figure are:

[0031] 1. Feeding platform; 2. Loading roller; 3. Positioning plate; 4. Dust cover; 5. Cleaning head; 6. Vacuum cleaner; 7. Movable seat; 8. Reel box; 9. Winding rod; 10. Plastic belt; 11. Fixing sleeve; 12. Torsion spring; 13. Slider; 14. Sliding rod; 15. Threaded rod; 16. Control lever; 17. Movable rod; 18. T-block; 19. Connecting plug; 20. Pressing frame; 21. Embedding frame; 22. Embedding groove; 23. Connecting piece; 24. Connecting rod; 25. Pressing plate; 26. Pressing spring. DETAILED DESCRIPTION

[0032] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0033] Reference Figure 1-5 As shown, a dust prevention device for an oven feed positioning platform includes a feed platform 1 with an open top and connected to the oven. A plurality of supporting rollers 2 are rotatably arranged between the inner walls on both sides of the feed platform 1. One end of the supporting roller 2 is externally connected to a roller motor (not shown). Two positioning plates 3 are symmetrically distributed on the inner side of the feed platform 1 and are located above the supporting rollers 2.

[0034] During use, the device to be dried is placed in advance through the top opening of the feeding platform 1 and accurately placed on the inner side of the feeding platform 1. The limiting structure composed of two positioning plates 3 can position the device laterally to ensure that the device is in the center of the feeding channel; at the same time, the bottom of the device is in close contact with the roller body of the supporting roller 2 and is stably supported. Subsequently, the roller motor connected to the supporting roller 2 is started, and the motor drives the supporting roller 2 to rotate at a constant speed. With the friction between the roller surface and the device, the device is stably conveyed into the oven along the set path under the precise limitation of the two positioning plates 3. During the entire process, the positioning plate 3 ensures that the device does not deviate, and the supporting roller 2 continuously provides stable conveying power. The two work together to achieve precise positioning of the device and efficient feeding.

[0035] To facilitate placement of components on the feeding platform 1, the top of the conventional feeding platform 1 is open. However, this often results in the inner side of the feeding platform 1 being directly exposed to the outside. As a result, dust and debris from the outside enter the feeding platform 1 during the process of conveying components into the oven and contaminate the components, affecting the baking quality of the components.

[0036] For this purpose, refer to Figure 2 As shown, it is worth noting that it also includes a dust-proof and efficiency-enhancing mechanism for improving the drying quality of the device;

[0037] The dust-proof and efficiency-enhancing mechanism mainly consists of a covering and protection part for reducing the impact of external dust and impurities on the device, and a suction part for efficiently cleaning impurities carried by the device itself;

[0038] The covering and protecting part is a dust cover plate 4, which is hinged to the open end of the feeding platform 1;

[0039] By setting the covering protection part, after the device is placed in the inner side of the feeding platform 1, the dust cover 4 is flipped over to close the opening of the feeding platform 1. In this way, the dust cover 4 isolates the inside and outside of the feeding platform 1 during the process of the carrying roller 2 conveying the device, thereby reducing the impact of external dust and impurities on the device.

[0040] However, the use of the dust cover 4 is only focused on isolating the external environment. It is not equipped with a mechanism or function for cleaning impurities in the device itself, and cannot clean the impurities attached to the device before it is placed on the feeding platform 1.

[0041] In the actual production process, dust, debris and other impurities often adhere to the surface of the device during storage, transportation or early processing. These impurities will remain before the device enters the feeding platform 1. When the device with impurities enters the tunnel oven, the impurities may undergo physical or chemical changes during the high-temperature baking process, which not only affects the appearance quality of the device, but also may change the physical and chemical properties of the device, reduce product quality, and even cause the product to be unqualified.

[0042] To solve this problem, refer to Figure 2-4 As shown, it is worth noting that the suction part includes a dust suction head 5 transversely embedded in the inner wall of the dust cover 4 and a dust collector 6 installed on the top surface of the dust cover 4, and the suction end of the dust collector 6 is fixedly connected to the dust suction head 5 through a dust suction pipe;

[0043] Through the setting of the suction part, when the device is stably conveyed along the feeding platform 1 under the precise limit of the two positioning plates 3, the vacuum cleaner is started, and its powerful suction force is transmitted to the vacuum head 5 through the pipe. At this time, the vacuum head 5 continues to form a stable suction force field on the internal space of the feeding platform 1. As the device slowly moves to the bottom of the vacuum head 5 driven by the carrying roller 2, the suction force field can accurately act on the surface of the device, and quickly extract the attached dust, debris and other impurities. The suction part realizes the efficient removal of impurities on the surface of the device through the coordinated operation of the vacuum cleaner 6 and the vacuum head 5, ensuring that the device entering the oven is clean and improving the quality of subsequent drying processing.

[0044] Although the suction part can be used to relatively clean the impurities on the surface of the device itself in the above embodiment, the suction head 5 has a large diameter, the actual effective area is large, and the suction force is dispersed. Once the device transferred between the two positioning plates 3 is small in size, the suction head 5 with a large diameter cannot generate sufficient negative pressure to concentrate on sucking impurities from the device surface, resulting in a poor cleaning effect.

[0045] For this purpose, refer to Figure 2-5 As shown, it is worth mentioning that the suction part also includes a diameter adjustment component for adjusting the diameter of the dust collector head 5;

[0046] The diameter adjustment component includes two winding boxes 8 with cavities inside and symmetrically fixed to the bottom surface of the dust cover 4. The dust collection head 5 is located between the two winding boxes 8. The suction end of the dust collection head 5 slides symmetrically on two movable seats 7. The two movable seats 7 correspond to the two winding boxes 8 one by one, and the movable seats 7 and the winding boxes 8 are connected by a covering member.

[0047] The covering member includes a winding rod 9 that rotates laterally between the inner walls of the winding box 8 and a plastic belt 10 that is wound around the winding rod 9. The end of the plastic belt 10 passes through the winding box 8 and is fixed to the movable seat 7. The portion of the plastic belt 10 located outside the winding box 8 is in contact with the suction end of the vacuum cleaner head 5.

[0048] A fixing sleeve 11 is fixed to one side wall of the winding box 8. One end of the winding rod 9 passes through the winding box 8 and enters the fixing sleeve 11. The rod body of the winding rod 9 located in the fixing sleeve 11 is provided with a torsion spring 12. The two ends of the torsion spring 12 are respectively fixed to the fixing sleeve 11 and the outer wall of the winding box 8.

[0049] By setting the diameter adjustment component, the two movable seats 7 slide towards each other according to the size of the device to be dried, so that the distance between them accurately matches the size of the device. During the sliding process of the movable seat 7, the movable seat 7 stretches one end of the plastic belt 10, so that it continuously extends outward from the inside of the winding box 8, and simultaneously twists the torsion spring 12 to provide tension for the plastic belt 10, ensuring that it is always in a taut state;

[0050] During the stretching process, the winding box 8 with flexibility and plasticity can fit tightly against the opening of the vacuum head 5. By changing the position of the movable seat 7, the opening shape and area of the vacuum head 5 can be changed in real time. When the spacing between the movable seats 7 is reduced to adapt to small-sized materials, the winding box 8 will seal the excess area of the opening of the vacuum head 5, so that the suction force is concentrated on the surface of the device, forming a local high-efficiency negative pressure environment. Compared with the traditional large-diameter vacuum head 5, this structure effectively reduces the area of ineffective suction.

[0051] Further, refer to Figure 2-4 As shown, it is worth noting that a sliding rod 14 and a threaded rod 15 are symmetrically distributed between the two winding boxes 8. The sliding rod 14 is fixed between the two winding boxes 8, and the threaded rod 15 rotates between the two winding boxes 8. The rod body of the sliding rod 14 is symmetrically slidably sleeved with two sliders 13, and the two sliders 13 are respectively fixedly connected to the two movable seats 7. The rod body of the threaded rod 15 is symmetrically threadedly sleeved with two nut seats, and the two nut seats are respectively fixedly connected to the two movable seats 7.

[0052] The top of the dust cover 4 is rotated through a control rod 16, and the control rod 16 is connected to the threaded rod 15 through a bevel gear transmission;

[0053] The knob controls the rod 16 , and the control rod 16 can drive the threaded rod 15 under the action of the bevel gear, so that the two nut seats slide toward each other under the threaded structure, thereby causing the two movable seats 7 to slide toward each other, providing power for the movable seat 7 .

[0054] Further, refer to Figure 2-4 As shown, it is worth noting that the diameter adjustment component further includes a pressing member for improving the covering effect of the covering member;

[0055] The pressing member includes a pressing frame 20 that is adapted to the shape of the open end of the vacuum cleaner head 5 and slides under the plastic belt 10. An embedding frame 21 is fixed to the top surface of the pressing frame 20. The open end of the vacuum cleaner head 5 is provided with an embedding groove 22 that is adapted to the embedding frame 21. The top of the movable seat 7 is symmetrically provided with two longitudinal notches, and the front and rear sides of the pressing frame 20 slide in the two longitudinal notches respectively;

[0056] A connecting piece 23 is fixed to the middle of both the front and rear sides of the compression frame 20, and a connecting rod 24 is vertically fixed to the connecting piece 23. The end of the connecting rod 24 passes through the dust cover 4, and a pressure plate 25 is fixed between the ends of the two connecting rods 24. The rod body of the connecting rod 24 is provided with a compression spring 26, and the two ends of the compression spring 26 are respectively fixed to the pressure plate 25 and the dust cover 4;

[0057] By setting the pressing member, before the position of the movable seat 7 needs to be adjusted, the operator manually presses down the pressing plate 25, and the pressing plate 25 drives the pressing rod and the pressing piece to move downward synchronously, thereby driving the pressing frame 20 to descend rapidly. At this time, the embedding frame 21 withdraws from the embedding groove 22 and completely breaks away from the contact with the plastic belt 10, effectively eliminating the obstruction to the extension or contraction of the plastic belt 10, so that the plastic belt 10 can be freely stretched and adjusted under the drive of the movable seat 7. During the downward pressing process, the compression spring 26 is squeezed by the pressure plate 25 to produce elastic deformation, thereby storing elastic potential energy;

[0058] When the movable seat 7 completes the sliding adjustment according to the size of the device, the operator releases the pressure plate 25. Under the action of the elastic force of the compression spring 26, the pressure plate 25 quickly moves up and resets, and drives the compression frame 20 and the embedding frame 21 to rise together through the connecting rod 24. The embedding frame 21 re-extrudes the edge of the plastic belt 10 and tightly embeds it into the groove 22 to form a sealing structure. Through this tight embedding fit, the gap between the plastic belt 10 and the open end of the vacuum head 5 is effectively filled, preventing airflow leakage during vacuuming and ensuring the stability of the negative pressure inside the vacuum head 5.

[0059] Further, refer to Figure 2-4 As shown, it is worth noting that a connecting plug 19 is fixed to the top of the positioning plate 3, and a connecting slot adapted to the connecting plug 19 is provided at the bottom of the movable seat 7;

[0060] Two movable rods 17 in an eight-shaped shape are provided between the positioning plate 3 and the inner side wall of the feeding platform 1. One end of the movable rod 17 is hingedly connected to the positioning plate 3, and the other end of the movable rod 17 is hingedly connected to a T-shaped block 18. A sliding groove adapted to the T-shaped block 18 is provided on the inner side wall of the feeding platform 1;

[0061] By setting the connecting plug 19, when the dust cover 4 is flipped over and the top of the feeding platform 1 is closed, the connecting plug 19 can be aligned and inserted into the connecting slot at the bottom end of the movable seat 7, thereby connecting the positioning plate 3 to the movable seat 7. Therefore, when the distance between the two movable seats 7 is adjusted according to the size of the device to be processed, the positioning plate 3 can move synchronously with the movable seat 7, thereby making the positioning plate 3 suitable for contacting devices of different sizes, thereby enhancing applicability;

[0062] And through the setting of the movable rod 17 and the T-block 18, when the positioning plate 3 moves synchronously with the movable seat 7, one end of the movable rod 17 is pulled by the positioning plate 3 and deflected, causing the T-block 18 to slide in the slide groove. In this way, the T-block 18 cooperates with the movable rod 17 to effectively provide auxiliary support for the positioning plate 3 and ensure the stability of the positioning plate 3 during movement.

[0063] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A dust prevention device for an oven feed positioning platform, comprising a feed platform (1) with an open top and connected to the oven, a plurality of bearing rollers (2) being rotatably arranged between the inner walls on both sides of the feed platform (1), and two positioning plates (3) symmetrically distributed on the inner side of the feed platform (1) and located above the bearing rollers (2), characterized in that: It also includes a dust-proof and efficiency-enhancing mechanism for improving the drying quality of the device; The dust-proof and efficiency-enhancing mechanism mainly consists of a covering and protecting part for reducing the impact of external dust and impurities on the device, and a suction part for efficiently cleaning impurities carried by the device itself; The covering and protecting portion is a dust cover plate (4), and the dust cover plate (4) is hinged to the open end of the feeding platform (1); The suction part comprises a dust collecting head (5) transversely embedded in the inner wall of the dustproof cover (4) and a dust collector (6) mounted on the top surface of the dustproof cover (4); the suction end of the dust collector (6) is fixedly connected to the dust collecting head (5) via a dust collecting pipe.

2. The dust-proof device for the oven feeding positioning platform according to claim 1, characterized in that: The suction unit also includes a diameter adjustment component for adjusting the diameter of the dust collector head (5); The diameter adjustment component includes two winding boxes (8) with cavities inside, which are symmetrically fixed to the bottom surface of the dust cover (4); the dust suction head (5) is located between the two winding boxes (8); the suction end of the dust suction head (5) slides symmetrically with two movable seats (7); the two movable seats (7) correspond to the two winding boxes (8) respectively, and the movable seats (7) and the winding boxes (8) are connected by a covering component.

3. The dust-proof device for the oven feeding positioning platform according to claim 2, characterized in that: The covering member comprises a winding rod (9) which rotates transversely between the inner walls on both sides of the winding box (8) and a plastic belt (10) which is wound around the rod body of the winding rod (9); the end of the plastic belt (10) passes through the winding box (8) and is fixedly connected to the movable seat (7); the portion of the plastic belt (10) located outside the winding box (8) is in contact with the suction end of the dust collector head (5).

4. The dust-falling prevention device for the oven feeding positioning platform according to claim 3, characterized in that: A fixing sleeve (11) is fixed to one side wall of the winding box (8), one end of the winding rod (9) passes through the winding box (8) and enters the fixing sleeve (11), and the winding rod (9) is located in the fixing sleeve (11) and is provided with a torsion spring (12). The two ends of the torsion spring (12) are respectively fixed to the fixing sleeve (11) and the outer wall of the winding box (8).

5. The dust-proof device for the oven feeding positioning platform according to claim 4, characterized in that: A sliding rod (14) and a threaded rod (15) are symmetrically distributed between the two winding boxes (8). The rod body of the sliding rod (14) is symmetrically slidably sleeved with two sliders (13), and the two sliders (13) are respectively fixedly connected to the two movable seats (7). The rod body of the threaded rod (15) is symmetrically threadedly sleeved with two nut seats, and the two nut seats are respectively fixedly connected to the two movable seats (7).

6. The dust-falling prevention device for the oven feeding positioning platform according to claim 3, characterized in that: The diameter adjustment assembly further includes a pressing member for improving the covering effect of the covering member; The clamping member comprises a clamping frame (20) adapted to the shape of the opening end of the vacuum cleaner head (5) and sliding under the plastic belt (10); an embedding frame (21) is fixed to the top surface of the clamping frame (20); an embedding groove (22) adapted to the embedding frame (21) is provided at the opening end of the vacuum cleaner head (5); two longitudinal notches are symmetrically provided at the top end of the movable seat (7); and the front and rear sides of the clamping frame (20) slide in the two longitudinal notches respectively.

7. The dust-falling prevention device for the oven feeding positioning platform according to claim 6, characterized in that: A connecting piece (23) is fixed in the middle of both the front and rear sides of the compression frame (20), a connecting rod (24) is vertically fixed on the connecting piece (23), the end of the connecting rod (24) passes through the dust cover (4), and a pressure plate (25) is fixed between the ends of the two connecting rods (24), the rod body of the connecting rod (24) is provided with a compression spring (26), and the two ends of the compression spring (26) are respectively fixed to the pressure plate (25) and the dust cover (4).

8. The dust-falling prevention device for the oven feeding positioning platform according to claim 2, characterized in that: A connecting plug (19) is fixed on the top end of the positioning plate (3), and a connecting slot adapted to the connecting plug (19) is provided on the bottom end of the movable seat (7).

9. The dust-falling prevention device for the oven feeding positioning platform according to claim 8, characterized in that: Two movable rods (17) in an eight-shaped shape are provided between the positioning plate (3) and the inner side wall of the feeding platform (1), one end of the movable rod (17) is hingedly connected to the positioning plate (3), and the other end of the movable rod (17) is hingedly connected to a T-shaped block (18), and a sliding groove adapted to the T-shaped block (18) is provided on the inner side wall of the feeding platform (1).

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