Novel guide chute capable of reducing scattered materials and dust

Abstract

The invention discloses a novel guide chute capable of reducing scattered materials and dust, and relates to the technical field of guide chute devices, the novel guide chute comprises an outer frame body and a conveyor belt arranged below the outer frame body and used for conveying materials, and further comprises a plurality of groups of supporting legs used for supporting the conveyor belt and driving rollers arranged on the plurality of groups of supporting legs, an overflow preventing mechanism for preventing materials conveyed on the conveying belt from overflowing is arranged on the supporting legs, the overflow preventing mechanism comprises a material guide plate fixedly connected to the outer frame body, an overflow preventing apron board is fixed to the material guide plate through bolts, and a longitudinal swing assembly for adjusting the orientation of a brush is arranged on the material guide plate; by arranging the overflow preventing mechanism, arranging the two sets of overflow preventing apron boards on the two sides of the conveying belt and driving the overflow preventing apron boards and the conveying belt to form certain tiny gaps, solid materials with large diameters can be prevented from being scattered from the edge of the conveying belt, brushes are arranged on the outer sides of the overflow preventing apron boards, and the situation that the materials escape from the gaps is further reduced; the material scattering phenomenon is effectively reduced, and material waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of material guide trough devices, specifically a novel material guide trough that reduces spillage and dust. Background Technology

[0002] A feed chute is a device used to guide materials to flow in a predetermined direction on conveying equipment (such as conveyor belts, conveyors, etc.). It is usually installed at specific locations on the conveying equipment, such as the material loading port, transfer point, or unloading port, to ensure that the materials can be transported smoothly and steadily.

[0003] Existing material guide chutes use baffles on both sides of the conveyor belt to prevent material spillage. However, the baffles are too loosely attached to the conveyor belt below, resulting in limited sealing and significant material spillage through the gaps. Conversely, if the baffles are too tightly attached to the conveyor belt below, both the baffles and the edges of the conveyor belt wear out quickly, thus affecting the service life of the conveyor belt. Therefore, a new type of material guide chute to reduce material spillage and dust is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a novel material guide chute that reduces spillage and dust, effectively reducing material spillage and solving the problems of limited sealing effect of baffles or easy wear of transmission belts.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel material guide trough for reducing spillage and dust, comprising an outer frame and a conveyor belt below it for conveying materials, and further comprising multiple sets of support legs for supporting the conveyor belt and transmission rollers disposed on the multiple sets of support legs, wherein the support legs are provided with an overflow prevention mechanism to prevent the conveyed materials on the conveyor belt from overflowing.

[0006] The overflow prevention mechanism includes a guide plate fixedly connected to the outer frame, an anti-overflow skirt plate bolted to the guide plate, the bottom of the anti-overflow skirt plate including an integrally formed pointed arc, a swing pressure plate provided on the outer surface of the anti-overflow skirt plate, a positioning frame fixedly connected to the swing pressure plate, a brush detachably connected to the positioning frame and a bolt for fixing the brush threadedly connected thereto, the bottom end and the pointed arc of the brush being close to the side of the conveyor belt, and a longitudinal swing assembly for adjusting the direction of the brush provided on the guide plate;

[0007] A positioning plate is provided between adjacent support legs. The positioning plate is fixedly connected to the support leg. Multiple sets of column cylinders are fixedly connected to the positioning plate. The column cylinders are provided with auxiliary support components to prevent the conveyor belt located between adjacent support legs from sagging excessively.

[0008] Preferably, the longitudinal swing assembly includes a T-shaped seat fixedly connected to the guide plate, a connecting seat is provided below the T-shaped seat, the connecting seat is fixedly connected to the swing pressure plate, and a relief rod is rotatably mounted on the connecting seat, with one end of the relief rod away from the connecting seat rotating on the guide plate.

[0009] The T-shaped seat has a fixed swing rod that rotates on a fixed axis. The end of the swing rod away from the T-shaped seat has a through hole. The connecting seat has a mounting hole that matches the through hole and allows the pin to pass through.

[0010] An L-shaped side extension plate is fixedly connected to the guide plate, and a hook is fixedly connected to the L-shaped side extension plate. A hook frame that engages with the hook is fixedly connected to the connecting seat.

[0011] Preferably, the anti-overflow skirt is fixedly connected to a plurality of side posts on the side facing the sway plate, and the plurality of side posts are arranged in a rectangular array and are in contact with the sway plate.

[0012] Preferably, the auxiliary support assembly includes a central column coaxially arranged with the cylindrical cavity and slidingly passing through the cylindrical cavity. A base frame is fixedly connected to the top of the central column. Multiple sets of rollers rotate on the base frame at a fixed axis. A return spring is sleeved on the outer circumferential surface of the central column. The two ends of the return spring are fixedly connected to the cylindrical cavity and the base frame, respectively.

[0013] The cylindrical cavity includes an integrally formed inner cavity, an inner pressure plate is provided inside the inner cavity, the inner pressure plate is fixedly sleeved on the central column, and the outer peripheral surface of the inner pressure plate is in sliding contact with the inner wall of the inner cavity.

[0014] The inner pressure plate has multiple sets of gas-blocking grooves for gas flow.

[0015] Preferably, the multiple sets of rollers are arranged in an array along the conveying direction of the outer frame.

[0016] Preferably, the cylindrical cavity further includes an integrally formed outer cavity, and the cylindrical cavity has multiple sets of connecting channels for gas flow between the inner cavity and the outer cavity.

[0017] Preferably, an open cylinder is fixedly connected to the cylindrical cavity, and a bottom pressure plate is provided inside the open cylinder. The bottom pressure plate is coaxially fixed on the central column, and the outer peripheral surface of the bottom pressure plate is in sliding contact with the inner wall of the open cylinder.

[0018] The open cylinder includes an integrally formed air inlet and air outlet. An exhaust pipe is fixedly connected to the air outlet, and the end of the exhaust pipe away from the open cylinder is fixedly connected to the outer frame.

[0019] Preferably, one end of the exhaust pipe within the outer frame is fixedly connected to multiple sets of air outlets, all of which are inclined toward the material conveying direction.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention, by setting up an overflow prevention mechanism, involves installing two sets of overflow prevention skirts on both sides of the conveyor belt and driving the skirts to maintain a certain small gap with the conveyor belt. This can prevent large-diameter solid materials from spilling from the edge of the conveyor belt. Brushes are installed on the outside of the overflow prevention skirts, and the bottom of the brushes can contact the upper surface of the conveyor belt to block smaller-diameter solid materials, further reducing the escape of materials from the gaps. This effectively reduces material spillage, reduces material waste, lowers production costs, and avoids the adverse effects of spilled materials on the surrounding environment and equipment.

[0022] 2. By setting up auxiliary support components, the present invention can support the conveyor belt between adjacent support legs, reduce the degree of sag of the conveyor belt under load, and maintain the set cross-sectional shape of the conveyor belt between adjacent support legs, thereby making the conveyor belt run more smoothly and reducing the risk of material spillage.

[0023] 3. In actual use, the relative positions of the positioning frame and the brush can be changed according to actual needs, thereby changing the exposed length of the brush on the positioning frame. When material spillage occurs at the edge of the conveyor belt, the exposed length of the brush can be adjusted to drive the brush end to contact the surface of the conveyor belt, thereby blocking the spilled part and achieving targeted adjustment of the spilled part, thus enhancing the adaptability of the guide chute. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the component containing the support leg of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view at point B in the middle;

[0027] Figure 4 This is a schematic diagram of the component containing the spill-proof skirt panel of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the component containing the conveyor belt in this invention;

[0030] Figure 7 This is a schematic diagram of the component containing the roller of the present invention;

[0031] Figure 8 This is a schematic diagram of the component containing the cylindrical cavity of the present invention;

[0032] Figure 9 For the present invention Figure 8 Enlarged view of point C.

[0033] In the diagram: 1. Support leg; 2. Conveyor belt; 3. Outer frame; 4. Guide plate; 5. L-shaped side extension plate; 6. Anti-overflow skirt; 7. Swing pressure plate; 8. Positioning frame; 9. Brush; 10. T-shaped seat; 11. Fixed swing rod; 12. Yield rod; 13. Connecting seat; 14. Hook frame; 15. Hook; 16. Base frame; 17. Roller; 18. Positioning plate; 19. Column cavity; 191. Inner chamber; 192. Outer chamber; 20. Connecting channel; 21. Shaft column; 22. Return spring; 23. Inner pressure plate; 24. Air blocking groove; 25. Bottom pressure plate; 26. Opening cylinder; 27. Exhaust pipe; 28. Side column. Detailed Implementation

[0034] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 9 The present invention provides a technical solution: a novel material guide trough for reducing spillage and dust, including an outer frame 3 and a conveyor belt 2 below it for conveying materials, and also including multiple sets of support legs 1 for supporting the conveyor belt 2 and transmission rollers arranged on the multiple sets of support legs 1, wherein the support legs 1 are provided with an overflow prevention mechanism to prevent the material conveyed on the conveyor belt 2 from overflowing.

[0036] The overflow prevention mechanism includes a guide plate 4 fixedly connected to the outer frame 3. An anti-overflow skirt 6 is bolted to the guide plate 4. The bottom of the anti-overflow skirt 6 includes an integrally formed pointed arc. A swing pressure plate 7 is provided on the outer surface of the anti-overflow skirt 6. A positioning frame 8 is fixedly connected to the swing pressure plate 7. A brush 9 is detachably connected to the positioning frame 8 and a bolt for fixing the brush 9 is threaded on it. The bottom end and the pointed arc of the brush 9 are close to the side of the conveyor belt 2. A longitudinal swing component for adjusting the orientation of the brush 9 is provided on the guide plate 4.

[0037] A positioning plate 18 is provided between adjacent support legs 1. The positioning plate 18 is fixedly connected to the support leg 1. Multiple sets of column cylinders 19 are fixedly connected to the positioning plate 18. The column cylinders 19 are provided with auxiliary support components to prevent the conveyor belt 2 located between adjacent support legs 1 from excessively sagging.

[0038] like Figure 1 - Figure 5As shown, when materials are conveyed via the conveyor belt 2, two sets of anti-overflow skirts 6 are set on both sides of the conveyor belt 2, and a certain small gap is created between the anti-overflow skirts 6 and the upper surface of the conveyor belt 2. This can prevent materials from spilling onto the conveyor belt 2 to a certain extent. At the same time, brushes 9 are simultaneously set on the outer side of the anti-overflow skirts 6, and the bottom of the brushes 9 can contact the upper surface of the conveyor belt 2. The bottom of the brushes 9 faces the gap between the swing plate 7 and the conveyor belt 2, thereby preventing materials from escaping from the gap.

[0039] The anti-overflow skirt 6 prevents larger diameter solid materials from spilling from the edge of the conveyor belt 2. Furthermore, the anti-overflow skirt 6 does not contact the outer frame 3, thus avoiding damage caused by contact between the anti-overflow skirt 6 and the long-term operating outer frame 3, thereby ensuring the service life of the outer frame 3. By adding a brush 9 to the outside of the anti-overflow skirt 6 and directing the brush 9 towards the gap between the anti-overflow skirt 6 and the outer frame 3, smaller diameter solid materials can be blocked by the brush 9. The densely arranged bristles on the brush 9 can also block dust on both sides of the conveyor belt 2, preventing dust or particles caused by material transport from escaping through the gap.

[0040] In actual use, the relative positions of the card slot frame 8 and the brush 9 can be changed according to actual needs, thereby changing the exposed length of the brush 9 on the card slot frame 8. When material spillage occurs at the edge of the conveyor belt 2, the exposed length of the brush 9 can be adjusted to drive the end of the brush 9 to contact the surface of the conveyor belt 2, thereby blocking the spilled part and achieving a targeted adjustment process for the spilled part.

[0041] At the same time, the orientation of the brush 9 can be changed by the swing component, that is, the brush 9 can be driven to deflect away from the conveyor belt 2. In actual use, this makes it easier to replace and maintain the brush 9, and provides personnel with a more portable maintenance space.

[0042] Meanwhile, when the conveyor belt 2 is conveying materials, since the conveyor belt 2 between the two sets of support legs 1 is not directly supported, if the distance between adjacent support legs 1 is too large and the material accumulates excessively at a certain point on the conveyor belt 2, the conveyor belt 2 between the adjacent support legs 1 may deform under the influence of the material's gravity, resulting in excessive sagging. Therefore, by setting auxiliary support components between adjacent support legs 1, the conveyor belt 2 between the adjacent support legs 1 can be supported to reduce the degree of sagging of the conveyor belt 2 under load, so that the conveyor belt 2 maintains the set cross-sectional shape between adjacent support legs 1, thereby making the conveyor belt 2 run more smoothly and reducing the risk of material spillage.

[0043] In one preferred embodiment, the longitudinal swing assembly includes a T-shaped seat 10 fixedly connected to the guide plate 4, a connecting seat 13 is provided below the T-shaped seat 10, the connecting seat 13 is fixedly connected to the swing pressure plate 7, and a relief rod 12 is rotatably mounted on the connecting seat 13, with one end of the relief rod 12 away from the connecting seat 13 rotatably mounted on the guide plate 4.

[0044] The T-shaped seat 10 has a fixed pivot rod 11 that rotates on a fixed axis. The end of the pivot rod 11 away from the T-shaped seat 10 has a through hole. The connecting seat 13 has a mounting hole that matches the through hole and allows the pin to pass through. The guide plate 4 has an L-shaped side extension plate 5 that is fixedly connected to it. The L-shaped side extension plate 5 has a hook 15 that is fixedly connected to it. The connecting seat 13 has a hook frame 14 that engages with the hook 15.

[0045] The anti-overflow skirt 6 is fixedly connected to a plurality of side posts 28 on one side facing the swaying pressure plate 7. The plurality of side posts 28 are arranged in a rectangular array and are in contact with the swaying pressure plate 7.

[0046] like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, when the brush 9 is in use, a connecting seat 13 is fixedly connected to the swing plate 7, and the connecting seat 13 is provided with a relief rod 12 and a fixed swing rod 11. The two ends of the relief rod 12 and the fixed swing rod 11 are respectively fixedly rotated on the fixed swing rod 11 and the relief rod 12. Thus, the position of the connecting seat 13 is restricted by the relief rod 12 and the fixed swing rod 11, so as to drive the swing plate 7 to abut against the multiple sets of side posts 28 on the anti-overflow skirt plate 6, and the position of the swing plate 7 and the brush 9 on it is restricted by the multiple sets of side posts 28.

[0047] Meanwhile, when it is necessary to repair or replace the brush 9, pull out the pins on both the fixed swing rod 11 and the connecting seat 13, and manually deflect the swing pressure plate 7 to cause the hook frame 14 to be hooked on the hook 15. At this time, the brush 9 deflects away from the swing pressure plate 7, and the hook 15 and hook frame 14 achieve stability after deflection. This exposes the bolt locking position of the brush 9 on the locking frame 8 to the maintenance personnel's field of vision, so as to facilitate the maintenance or replacement process of the brush 9.

[0048] Based on the longitudinal swing assembly embodiment, the auxiliary support assembly includes a central column 21 coaxially arranged with the cylindrical cavity 19 and slidingly passing through the cylindrical cavity 19. A base frame 16 is fixedly connected to the top of the central column 21. Multiple sets of rollers 17 rotate on the base frame 16. A return spring 22 is sleeved on the outer circumferential surface of the central column 21. The two ends of the return spring 22 are fixedly connected to the cylindrical cavity 19 and the base frame 16, respectively.

[0049] The cylindrical cavity 19 includes an integrally formed inner cavity 191. An inner pressure plate 23 is provided inside the inner cavity 191. The inner pressure plate 23 is fixedly sleeved on the central column 21, and the outer peripheral surface of the inner pressure plate 23 is in sliding contact with the inner wall of the inner cavity 191. Multiple sets of gas-blocking grooves 24 for gas flow are provided on the inner pressure plate 23.

[0050] Multiple sets of rollers 17 are arranged in an array along the conveying direction of the outer frame 3.

[0051] The cylindrical cavity 19 also includes an integrally formed outer cavity 192, and the cylindrical cavity 19 has multiple sets of connecting channels 20 for gas flow between the inner cavity 191 and the outer cavity 192.

[0052] like Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, when the conveyor belt 2 located between the two sets of support legs 1 falls due to factors such as the weight of the material, it can cause the conveyor belt 2 to contact the roller 17 below and apply downward pressure to the roller 17. The roller 17 rotates on the base frame 16 with a fixed axis, and the base frame 16 is fixedly connected to the shaft column 21, which can drive the shaft column 21 to slide on the column cavity 19 and cause the return spring 22 set between the base frame 16 and the column cavity 19 to undergo compression deformation.

[0053] At the same time, when the spindle 21 moves downward under the downward pressure, it can drive the inner pressure plate 23 fixed on it to move in the inner chamber 191. The inner chamber 191 is filled with gas. When the inner pressure plate 23 moves downward, it will squeeze the gas in the inner chamber 191 below the inner pressure plate 23. Then, the gas in the inner chamber 191 flows to the outer chamber 192 through the connecting channel 20, or flows to the top of the inner pressure plate 23 through the gas blocking groove 24.

[0054] By providing a connecting channel 20, a rapid response can be made when the conveyor belt 2 sags, allowing for a faster release of gas within the inner chamber 191. This enables multiple sets of rollers 17 to support the sagging conveyor belt 2. Simultaneously, by providing an air-blocking groove 24, excessive sag can occur when the conveyor belt 2 is subjected to significant downward pressure. As the gas passes through the air-blocking groove 24 and the inner pressure plate 23, its flow cross-sectional size decreases, increasing the damping force and preventing rapid sag when the conveyor belt 2 is subjected to significant downward pressure. Therefore, even if the material on the conveyor belt 2 is excessively heavy, the auxiliary support components allow for a certain degree of sag when the conveyor belt 2 carrying heavy material passes the rollers 17, preventing it from saging simultaneously due to excessive material weight. This provides auxiliary support for the conveyor belt 2, preventing spillage due to excessive sag between adjacent support legs 1.

[0055] It should be noted that by setting multiple sets of freely rotatable rollers 17 on the base frame 16, the conveyor belt 2 can be supported within a certain range. Furthermore, the multiple sets of rollers 17 do not contact the conveyor belt 2 in the initial state, thereby avoiding wear problems caused by contact between the two. At the same time, the freely rotatable rollers 17 can satisfy the requirement that the conveyor belt 2 transmits positive pressure to the shaft column 21, and the rotation mode of the rollers 17 can reduce the friction between the rollers 17 and the conveyor belt 2, thereby avoiding excessive wear of the conveyor belt 2 and ensuring the service life of the conveyor belt 2.

[0056] Based on the embodiment of the auxiliary support component, an open cylinder 26 is fixedly connected to the column cavity 19. A bottom pressure plate 25 is provided inside the open cylinder 26. The bottom pressure plate 25 is coaxially fixed on the central column 21. The outer peripheral surface of the bottom pressure plate 25 is in sliding contact with the inner wall of the open cylinder 26.

[0057] The open cylinder 26 includes an integrally formed air inlet end and an air outlet end. An exhaust pipe 27 is fixedly connected to the air outlet end, and the end of the exhaust pipe 27 away from the open cylinder 26 is fixedly connected to the outer frame 3.

[0058] The exhaust pipe 27 is fixedly connected to multiple sets of air outlets at one end inside the outer frame 3, and all sets of air outlets are inclined toward the material conveying direction.

[0059] like Figure 1 , Figure 3 , Figure 7 and Figure 8As shown, when the spindle 21 moves downward under positive pressure, it can drive the bottom pressure plate 25 fixed at its bottom to move inside the open cylinder 26, thereby squeezing the gas inside the open cylinder 26 and causing the gas inside the open cylinder 26 to be discharged through multiple sets of air outlets on the exhaust pipe 27. The multiple sets of air outlets are located inside the outer frame 3 and are inclined towards the material conveying direction, thereby causing the gas ejected from the air outlets to form a countercurrent airflow with the gas inside the outer frame 3, thereby reducing the wind speed inside the outer frame 3, so as to promote the dust to circulate locally within the outer frame 3 as much as possible, so that the dust settles under the action of gravity.

[0060] It should be noted that both the inlet and outlet ends of the open cylinder 26 are equipped with a set of one-way valves, and the valve ports of the two sets of one-way valves are in opposite directions. This ensures that outside air can only enter the open cylinder 26 through the inlet end and then be discharged into the exhaust pipe 27 through the open cylinder 26, thereby restricting the flow direction of the gas.

[0061] 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 novel material guide trough for reducing spillage and dust, comprising an outer frame (3) and a conveyor belt (2) below it for conveying materials, and further comprising multiple sets of support legs (1) for supporting the conveyor belt (2) and transmission rollers disposed on the multiple sets of support legs (1), characterized in that: The support leg (1) is provided with an overflow prevention mechanism to prevent the material conveyed on the conveyor belt (2) from overflowing; The overflow prevention mechanism includes a guide plate (4) fixedly connected to the outer frame (3), an anti-overflow skirt (6) is bolted on the guide plate (4), the bottom of the anti-overflow skirt (6) includes an integrally formed pointed arc part, the outer surface of the anti-overflow skirt (6) is provided with a swing pressure plate (7), a positioning frame (8) is fixedly connected on the swing pressure plate (7), a brush (9) is detachably connected to the positioning frame (8) and a bolt for fixing the brush (9) is threaded on it, the bottom end and the pointed arc part of the brush (9) are close to the side of the conveyor belt (2), and a longitudinal swing component for adjusting the orientation of the brush (9) is provided on the guide plate (4); A positioning plate (18) is provided between adjacent support legs (1). The positioning plate (18) is fixedly connected to the support leg (1). Multiple sets of column cylinders (19) are fixedly connected to the positioning plate (18). The column cylinders (19) are provided with auxiliary support components to prevent the conveyor belt (2) located between adjacent support legs (1) from excessively drooping.

2. The novel feed chute for reducing spillage and dust according to claim 1, characterized in that: The longitudinal swing assembly includes a T-shaped seat (10) fixedly connected to the guide plate (4), a connecting seat (13) is provided below the T-shaped seat (10), the connecting seat (13) is fixedly connected to the swing pressure plate (7), and a relief rod (12) is fixedly rotatable on the connecting seat (13), with one end of the relief rod (12) away from the connecting seat (13) fixedly rotatable on the guide plate (4); The T-shaped seat (10) has a fixed swing rod (11) that rotates on a fixed axis. The end of the fixed swing rod (11) away from the T-shaped seat (10) has a through hole. The connecting seat (13) has a mounting hole that matches the through hole and allows the pin to pass through. An L-shaped side extension plate (5) is fixedly connected to the guide plate (4), a hook (15) is fixedly connected to the L-shaped side extension plate (5), and a hook frame (14) that engages with the hook (15) is fixedly connected to the connecting seat (13).

3. A novel feed chute for reducing spillage and dust according to claim 2, characterized in that: The anti-overflow skirt (6) is fixedly connected to a number of side posts (28) on one side facing the swing pressure plate (7). The number of side posts (28) are arranged in a rectangular array and are in contact with the swing pressure plate (7).

4. A novel feed chute for reducing spillage and dust according to claim 2, characterized in that: The auxiliary support assembly includes a spindle (21) coaxially arranged with the cylindrical cavity (19) and slidingly passing through the cylindrical cavity (19). A base frame (16) is fixedly connected to the top of the spindle (21). Multiple sets of rollers (17) rotate on the base frame (16) at a fixed axis. A return spring (22) is sleeved on the outer circumferential surface of the spindle (21). The two ends of the return spring (22) are fixedly connected to the cylindrical cavity (19) and the base frame (16) respectively. The cylindrical cavity (19) includes an integrally formed inner cavity (191), and an inner pressure plate (23) is provided inside the inner cavity (191). The inner pressure plate (23) is fixedly sleeved on the central column (21), and the outer peripheral surface of the inner pressure plate (23) is in sliding contact with the inner wall of the inner cavity (191). The inner pressure plate (23) has multiple sets of gas-blocking grooves (24) for gas flow.

5. A novel feed chute for reducing spillage and dust according to claim 4, characterized in that: Multiple sets of rollers (17) are arranged in an array along the conveying direction of the outer frame (3).

6. A novel feed chute for reducing spillage and dust according to claim 4, characterized in that: The cylindrical cavity (19) also includes an integrally formed outer cavity (192), and the cylindrical cavity (19) has multiple sets of connecting channels (20) for gas flow between the inner cavity (191) and the outer cavity (192).

7. A novel feed chute for reducing spillage and dust according to claim 4, characterized in that: An open cylinder (26) is fixedly connected to the cylindrical cavity (19). A bottom pressure plate (25) is provided inside the open cylinder (26). The bottom pressure plate (25) is coaxially fixed on the central column (21). The outer circumferential surface of the bottom pressure plate (25) is in sliding contact with the inner wall of the open cylinder (26). The open cylinder (26) includes an integrally formed air inlet end and an air outlet end. An exhaust pipe (27) is fixedly connected to the air outlet end. The end of the exhaust pipe (27) away from the open cylinder (26) is fixedly connected to the outer frame (3).

8. A novel feed chute for reducing spillage and dust according to claim 7, characterized in that: The exhaust pipe (27) is fixedly connected to multiple sets of air outlets at one end inside the outer frame (3), and all sets of air outlets are inclined toward the material conveying direction.

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