Ton bag throwing and discharging closed dust suppression device used in combined mode

Abstract

The invention discloses a ton bag throwing and unloading closed dust suppression device for combined use, which comprises a ton bag (2) and a ton bag push-pull cutting device, the lower part of the ton bag (2) is positioned in a conical chute (10), the inner wall of the conical chute (10) is closely attached to the side surface of the ton bag (2), and the ton bag push-pull cutting device is arranged in the conical chute (10). The side wall of the upper part of the conical chute (10) is provided with a strip seam type dust suction port (11) connected with external dust removal equipment; the ton bag push-pull cutting device comprises a cross-shaped cutting knife (1) for cutting the bag bottom of a ton bag (2); the airtight dust suppression device for ton bag discharging comprises a ton bag (2) installed on the lower portion of a stock bin (19), a rectangular air pipe (13) is arranged on the periphery of a discharging opening of the stock bin (19), and an air outlet airflow air curtain is arranged on the rectangular air pipe (13) and can cover an air outlet (14) of a feeding opening in the upper portion of the ton bag (2). Dust overflow is remarkably reduced, the concentration of unorganized discharged dust in a plant is reduced, and the working environment of operators is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of dust prevention for throwing and unloading ton bags, and in particular relates to a closed dust suppression device for throwing and unloading ton bags. Background Art

[0002] Many materials in the production and operation of industrial enterprises are packed in ton bags. This packaging method is very convenient for transportation and storage, and it is low-cost and has a very high cost-effectiveness. However, how to deal with the dust from the ton bag throwing and unloading port has become a headache for the ton bag unloading position. The working principle of ton bag throwing is to hook and lift the ton bag to the top of the silo unloading port through mechanical devices such as electric hoists and winches, cut the bottom of the ton bag, and use gravity, vibration or pneumatic auxiliary devices to discharge the material to the conveying facility or storage silo. The working principle of unloading to the ton bag is to install the ton bag at the bottom of the silo unloading port and control the opening and closing of the unloading port to unload the ton bag. There is a large height difference in the throwing and unloading of ton bags, and secondary dust is easily generated during the unloading process. At the same time, due to the loose sealing, the ground is prone to gather and scatter materials, resulting in a serious excess of unorganized dust concentration inside the factory, which worsens the working environment of the operators.

[0003] At present, the more mature form of ton bag unloading is to lift the ton bag to the upper side of the silo unloading port through an electric hoist, close the ton bag door, form a closed space before unloading, and the supporting dust removal equipment will work to form a micro-negative pressure environment to control dust spillage. This unloading equipment has the disadvantages of large structural dimensions, loose sealing, high labor intensity for workers and influence on operation. At the same time, the supporting dust removal equipment is often large in size and is not suitable for narrow and compact places.

[0004] In order to solve the dust suppression problem of self-unloading ton bags, Chinese utility model patent ZL202322058182.5 discloses a self-unloading ton bag and a dust suppression and ash conveying system suitable for the ton bag, wherein the self-unloading ton bag comprises: a bag body with a sling, a discharge hole is arranged at the bottom of the bag body, a discharge conduit is arranged on the discharge hole, a short and long support bottom is arranged at the bottom of the bag body, a hanging rope is arranged on the short and long support bottom, a locking plate is arranged on the left and right sides of the bag body, a locking groove is arranged on the locking plate, and an elastic member is arranged in the locking groove. Unloading can be realized automatically without manual labor. The dust suppression and ash conveying system suitable for ton bags includes: an ash conveying system and a self-unloading ton bag, the ash conveying system includes: a frame, an ash bin is arranged on the frame, a feed hopper and a dust cover are arranged on the top of the ash bin, two dust shielding plates are hinged on the dust cover through hinges, a torsion spring is also arranged between the dust shielding plates and the dust cover, a semicircular hole is opened at the end of the dust shielding plate, and a crane is arranged on the frame. It can reduce the amount of dust when the ton bag discharges ash and prevent the raised dust from overflowing to the outside. But generally speaking, when the ton bag discharges ash, some dust still overflows to the outside.

[0005] Therefore, it is necessary to develop and design efficient, environmentally friendly and safe ton bag throwing and unloading closed dust suppression equipment. Summary of the invention

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a combined use ton bag throwing and unloading closed dust suppression device which has a simple structure, is easy to operate, has significant effects, has low operating and maintenance costs, and can significantly control the dust spillage during the throwing and unloading processes.

[0007] In order to achieve the above-mentioned purpose of the present invention, a combined ton bag throwing and unloading closed dust suppression device of the present invention adopts the following technical scheme:

[0008] The present invention discloses a combined use of a ton bag throwing and unloading closed dust suppression device, which is composed of a ton bag throwing closed dust suppression device and a ton bag unloading closed dust suppression device:

[0009] The enclosed dust suppression device for throwing ton bags includes ton bags and ton bag push-pull cutting devices; the ton bags are hoisted on the steel rails by electric hoists, the lower part of the ton bags are located in the conical chute, the inner wall of the conical chute is in close contact with the side surface of the ton bags, and a "slit" type dust suction port connected to the external dust removal equipment is provided on the upper side wall of the conical chute; a grid filter plate is installed at the lower part of the conical chute, and the lower part of the conical chute is connected to the upper part of the silo through the grid filter plate, and the grid filter plate is used to filter the coarse particles in the bulk material to prevent clogging in the silo; the ton bag push-pull cutting device includes a "cross"-shaped cutting knife for cutting the bottom of the ton bag, and the "cross"-shaped cutting knife is located on the bottom side of the ton bag. The enclosed dust suppression device for throwing ton bags reduces the height difference of unloading and thus reduces the generation of dust. The close contact between the side of the ton bag and the conical chute can prevent dust from overflowing, and the micro-negative pressure environment formed by the "slit" type suction port reduces secondary dust.

[0010] The ton bag unloading closed dust suppression device includes a ton bag installed at the lower part of the silo, the ton bag support is supported on a patterned support plate, a flexible cloth is installed at the lower part of the silo's discharge port and extends into the ton bag, a manual gate valve is arranged on the silo's discharge port, and the opening and closing of the manual gate valve can reduce the spillage of bulk materials when replacing the ton bag; a rectangular air duct is arranged around the silo's discharge port, the rectangular air duct is externally connected to a positive pressure fan, and an air outlet air curtain is provided on the rectangular air duct to cover the air outlet of the upper feed port of the ton bag.

[0011] Preferably, the ton bag push-pull cutting device further includes a push-pull rod, a guide bracket, a push-pull handle, and a limit plate. One end of the push-pull rod is connected to a "cross"-shaped cutter. The push-pull rod passes through the conical chute and is connected to the push-pull handle at the other end. The push-pull rod outside the conical chute is supported on the guide bracket, and the limit plate is arranged on the push-pull rod between the guide bracket and the push-pull handle. The push-pull rod is fully welded to the "cross"-shaped cutter. The guide bracket is used to ensure that the push-pull rod always moves along the axial direction, and the limit plate is used to limit the end position of the push-pull rod stroke. The operator pushes and pulls the "cross"-shaped cutter to cut the bottom of the ton bag to unload, and at the same time, a "slit" type dust suction port is installed on the top of the conical chute to form a micro-negative pressure environment to suppress the dust generated at the end of unloading.

[0012] Preferably, a braided spring is installed at the lower part of the patterned support plate, and the lower part of the braided spring is installed and fixed on the slow-setting soil bottom plate. The braided spring at the lower part of the ton bag in the ton bag unloading closed dust suppression device ensures that the height difference of the falling material is always kept at a low level.

[0013] Preferably, the angle between the outer wall of the conical chute and the horizontal plane is greater than the angle of repose of the material in the ton bag; the contact length between the inner wall of the conical chute and the surface of the ton bag is 200-400 mm.

[0014] Preferably, the angle between the outer wall of the tapered chute and the horizontal plane is 60° to 75°.

[0015] Preferably, the "cross"-shaped cutting knife is welded from four vertically intersecting arc-shaped blades, with the blade surface facing the operating surface; and the push-pull rod is made of φ12-φ18 threaded steel bars.

[0016] Preferably, the "slit" type dust suction port is installed 500mm to 600mm below the top of the conical chute, with an annular opening left all around, a slit width of 200 to 250mm, and is connected to an external dust removal device through a rectangular air duct.

[0017] Preferably, two rectangular air ducts are arranged around the discharge port of the silo to form two low-pressure air curtains to isolate the internal and external airflows from passing through. The positive pressure fan supplies air with a supply pressure of 80Pa to 120Pa. The air outlet structure is a strip-shaped structure. The induced air flow velocity at the lower side of the ton bag is greater than the escape velocity of the dust, which is 0.6m / s to 1.0m / s. The air curtains formed by the two compressed airs isolate the internal and external airflows from passing through, further reducing the dust spillage.

[0018] Preferably, a flexible cloth is installed at the lower part of the discharge port of the silo, and the outer extension of the flexible cloth is 0.8m to 1.2m. The flexible cloth is wrapped with a 50mm to 80mm wide hard plastic plate every 0.3m to 0.5m on the outside to enhance the strength and stability of the flexible cloth; the spring group is made of coil springs of the same specification, type and size, and the elastic coefficient is determined according to the weight of the ton bag and the height of the discharge port of the silo, and the value range is 15kN / m to 30kN / m.

[0019] The combined use of the ton bag throwing and unloading closed dust suppression device of the present invention has the following beneficial effects after adopting the above technical scheme:

[0020] (1) The enclosed dust suppression device for throwing materials reduces the height difference of unloading and thus reduces dust generation. The side of the ton bag is closely attached to the conical chute to prevent dust from overflowing. The micro-negative pressure environment formed by the "slit" type air suction port reduces secondary dust. The guide bracket provided in the ton bag push-pull cutting device is used to ensure that the push-pull rod always moves along the axial direction, and the limit plate is used to limit the end position of the push-pull rod travel.

[0021] (2) The spring assembly at the bottom of the ton bag in the unloading closed dust suppression device ensures that the height difference of the falling material is always maintained at a low level, and the air curtain formed by the two compressed air channels isolates the internal and external air flows from passing through, further reducing the dust overflow; a manual gate valve is provided on the unloading port of the silo, and the opening and closing of the manual gate valve can reduce the spillage of bulk materials when replacing ton bags.

[0022] (3) The present invention combines the use of a closed dust suppression device for ton bag throwing and a closed dust suppression device for ton bag unloading to significantly reduce dust spillage, reduce the concentration of unorganized dust emissions inside the factory, improve the working environment of operators, comply with national environmental protection policy requirements, reduce material waste, and reduce production costs.

[0023] (4) The relevant technical parameters designed by the present invention are reasonable and reliable, and can effectively control the dust spillage during the throwing and unloading process, with significant effects.

[0024] (5) Industrial test verification shows that the equipment of the present invention has a simple structure, reliable operation, convenient operation and maintenance, low equipment failure rate, long equipment service life, good technical and economic performance, and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the exterior structure diagram of the enclosed dust suppression device for ton bag throwing materials designed for the present invention.

[0026] Figure 2 This is the exterior structure diagram of the enclosed dust suppression device for ton bag unloading designed for the present invention.

[0027] Figure numerals: 1-"X"-shaped cutting knife; 2-ton bag; 3-electric hoist; 4-steel guide rail; 5-push-pull rod; 6-guide bracket; 7-push-pull handle; 8-limiting plate; 9-grid filter plate; 10-conical chute; 11-"slit" type dust suction port; 12-manual gate valve; 13-rectangular air duct; 14-air outlet; 15-flexible chute cloth; 16-patterned support plate; 17-braided spring; 18-slow-setting soil bottom plate; 19-silo. DETAILED DESCRIPTION

[0028] In order to better describe the present invention, the following is a further detailed description of a combined ton bag throwing and unloading closed dust suppression device of the present invention in combination with the drawings and embodiments. 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.

[0029] The invention discloses a combined ton bag throwing and unloading closed dust suppression device, which is composed of a ton bag throwing closed dust suppression device and a ton bag unloading closed dust suppression device.

[0030] Depend on Figure 1As shown in the external structure diagram of the enclosed dust suppression device for throwing ton bags designed by the present invention, in the embodiment, the enclosed dust suppression device for throwing ton bags designed by the present invention comprises a ton bag 2 and a ton bag push-pull cutting device; the ton bag 2 is hoisted on the steel guide rail 4 by an electric hoist 3, and the lower part of the ton bag 2 is located in the conical chute 10, and the inner wall of the conical chute 10 is in close contact with the side surface of the ton bag 2, and the contact length is 200-400mm, and the side surface of the ton bag 2 is in close contact with the conical chute 10 to avoid dust overflow; the outer wall of the conical chute 10 is sandwiched between the horizontal plane and the conical chute 10. The angle value is greater than the repose angle of the material contained in the ton bag 2, and is preferably 60° to 75°; a "slit" type dust suction port 11 is provided on the upper side wall of the conical chute 10, and the "slit" type dust suction port 11 is installed 500mm to 600mm below the top of the conical chute 10, with an annular opening left all around, and the slit width is 200 to 250mm, which is connected to the external dust removal equipment through a rectangular air duct; a grille filter plate 9 is installed at the lower part of the conical chute 10, and the lower part of the conical chute 10 is connected to the upper part of the silo 19 through the grille filter plate 9. The ton bag push-pull cutting device is composed of a "cross"-shaped cutter 1, a push-pull rod 5, a guide bracket 6, a push-pull handle 7, and a limit plate 8. The "cross"-shaped cutter 1 is located on the bottom side of the ton bag 2, and is used to cut the "cross"-shaped cutter 1 at the bottom of the ton bag 2; the "cross"-shaped cutter 1 is welded by four vertically intersecting arc blades, and the blade surface faces the operating surface; the push-pull rod 5 is made of φ12~φ18 threaded steel bars; one end of the push-pull rod 5 is connected to the "cross"-shaped cutter 1, the push-pull rod 5 passes through the conical chute 10 and is connected to the push-pull handle 7 at the other end, the push-pull rod 5 located outside the conical chute 10 is supported on the guide bracket 6, and the limit plate 8 is arranged on the push-pull rod 5 between the guide bracket 6 and the push-pull handle 7.

[0031] In actual use, the enclosed dust suppression device for throwing bulk bags designed by the present invention is hooked by the electric hoist 3 and moved along the steel guide rail 4 to the upper side of the discharge port, and then slowly descends until the side of the bulk bag 2 is in close contact with the conical chute 10. After that, the operator holds the push-pull handle 7 tightly to drive the push-pull rod to reciprocate along the axial direction of the guide bracket 6, and the "cross"-shaped cutter 1 cuts the bottom of the bulk bag. Under the action of the material's own gravity, the coarse particles are filtered out by the grid filter plate 9 and then fall into the ash bin 19 for temporary storage. At the same time, the supporting dust removal equipment starts to operate to form a micro-negative pressure environment, and the overflowed fine dust is sucked through the "slit" type dust suction port 11 to the surface of the dust removal filter material for collection, and compressed air is used to blow and clean the dust regularly. The enclosed dust suppression device for throwing bulk bags designed by the present invention reduces the height difference of the falling materials and thus reduces the generation of dust. The side of the bulk bag is in close contact with the conical chute to reduce dust overflow, and the "slit" type air suction port forms a micro-negative pressure environment to reduce secondary dust.

[0032] Depend on Figure 2As shown in the external structure diagram of the ton bag unloading closed dust suppression device designed by the present invention, in the embodiment, the ton bag unloading closed dust suppression device designed by the present invention includes a ton bag 2 installed at the lower part of the silo 19, and the ton bag 2 is supported on the patterned support plate 16. A flexible cloth 15 is installed at the lower part of the discharge port of the silo 19 and extends into the ton bag 2. The extension length of the flexible cloth 15 is 0.8m to 1.2m. A circle of 50mm to 80mm wide hard plastic plate is wrapped on the outer side of the flexible cloth 15 every 0.3m to 0.5m. A manual gate valve 12 is set on the discharge port of the silo 19, and the manual gate valve 12 can reduce the spillage of bulk materials when replacing ton bags. Two rectangular air ducts 13 are arranged around the discharge port of the silo 19, and an air curtain for air flow is arranged on the rectangular air duct 13 to cover the air outlet 14 of the upper feed port of the ton bag 2. The rectangular air duct 13 is externally connected to a positive pressure fan to form two low-pressure air curtains to isolate the internal and external air flows. The air supply pressure of the positive pressure fan is 80Pa~120Pa, and the air outlet structure is a strip type. The induced air flow velocity on the lower side of the ton bag 2 is greater than the escape velocity of the dust, and the value is 0.6m / s~1.0m / s; a group spring 17 is installed at the lower part of the pattern support plate 16, and the lower part of the group spring 17 is installed and fixed on the slow-setting soil bottom plate 18. The spring group 17 is made of helical springs of the same specification, type and size, and the elastic coefficient is determined according to the weight of the ton bag 2 and the height of the discharge port of the silo 19, and the value range is 15kN / m~30kN / m.

[0033] When unloading the ton bag unloading closed dust suppression device designed by the present invention, the ton bag 2 is placed under the ash discharge port, and the manual gate valve 12 is fully opened to start unloading. As the weight of the ton bag 2 continues to increase, the grouping spring 17 is gradually compressed to ensure that the height difference of the material is always kept at a low level. The discharge port uses a flexible slide cloth 15 with appropriate extension to reduce the material sedimentation speed and reduce the impact force. The patterned support plate 16 is used to support the ton bag 2, and the concrete bottom plate 18 is used to fix the connection grouping spring 17. The low-pressure air in the rectangular air duct 13 is ejected through the slit-type air outlet 14 to form two air curtains, which isolate the internal and external airflows from passing through, and further control the overflow of fine dust. The spring grouping at the bottom of the ton bag of the ton bag unloading closed dust suppression device designed by the present invention ensures that the height difference of the material is always kept at a low level. The air curtain formed by the two low-pressure airflows isolates the internal and external airflows from passing through, further reducing the dust overflow. The manual gate valve can reduce the spillage of bulk materials when replacing ton bags.

[0034] Industrial tests have shown that the combined use of the ton bag throwing material and unloading closed dust suppression device provided by the present invention can effectively reduce the height difference of the falling materials, avoid dust spillage, improve the surrounding working environment, and has the advantages of simple structure, convenient operation, significant effect, good technical and economic performance, low operating cost, etc. Through actual application on site at a magnetic material manufacturer in Ma'anshan City, Anhui Province, the process performance is reliable, the effect is significant, the operation is stable, and the technology is mature.

[0035] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined use of ton bag throwing and unloading closed dust suppression device, characterized in that It is composed of a closed dust suppression device for ton bag throwing and a closed dust suppression device for ton bag unloading: The enclosed dust suppression device for throwing ton bags comprises a ton bag (2) and a ton bag push-pull cutting device; the ton bag (2) is hoisted on a steel guide rail (4) by an electric hoist (3), the lower part of the ton bag (2) is located in a conical chute (10), the inner wall of the conical chute (10) is in close contact with the side surface of the ton bag (2), and a "slit" type dust suction port (11) connected to an external dust removal device is provided on the upper side wall of the conical chute (10); a grid filter plate (9) is installed at the lower part of the conical chute (10), and the lower part of the conical chute (10) is connected to the upper part of a silo (19) through the grid filter plate (9); the ton bag push-pull cutting device comprises a "cross" shaped cutting knife (1) for cutting the bottom of the ton bag (2), and the "cross" shaped cutting knife (1) is located on the bottom side of the ton bag (2); The ton bag unloading closed dust suppression device comprises a ton bag (2) installed at the bottom of a silo (19), the ton bag (2) is supported on a patterned support plate (16), a flexible cloth (15) is installed at the bottom of the discharge port of the silo (19) and extends into the ton bag (2), a manual gate valve (12) is arranged on the discharge port of the silo (19); a rectangular air duct (13) is arranged around the discharge port of the silo (19), the rectangular air duct (13) is externally connected to a positive pressure fan, and an air outlet air curtain is arranged on the rectangular air duct (13) to cover the air outlet (14) of the upper feed port of the ton bag (2).

2. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: The ton bag push-pull cutting device also includes a push-pull rod (5), a guide bracket (6), a push-pull handle (7), and a limit plate (8). One end of the push-pull rod (5) is connected to the "cross"-shaped cutting knife (1). The push-pull rod (5) passes through the conical chute (10) and is connected to the push-pull handle (7) at the other end. The push-pull rod (5) located outside the conical chute (10) is supported on the guide bracket (6). The limit plate (8) is arranged on the push-pull rod (5) between the guide bracket (6) and the push-pull handle (7).

3. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: A braided spring (17) is installed at the lower part of the pattern support plate (16), and the lower part of the braided spring (17) is installed and fixed on the slow-setting soil bottom plate (18).

4. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: The angle between the outer wall of the conical chute (10) and the horizontal plane is greater than the repose angle of the material in the ton bag (2); the contact length between the inner wall of the conical chute (10) and the surface of the ton bag (2) is 200 to 400 mm.

5. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 4, characterized in that: The angle between the outer wall of the tapered chute (10) and the horizontal plane is 60° to 75°.

6. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 2, characterized in that: The "cross" shaped cutting knife (1) is welded from four vertically intersecting arc-shaped blades, with the blade surface facing the operating surface; the push-pull rod (5) is made of φ12-φ18 threaded steel bars.

7. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: The "slit" type dust suction port (11) is installed 500mm to 600mm below the top of the conical chute (10), with an annular opening left around it, and the width of the slit is 200 to 250mm, and is connected to the external dust removal equipment through a rectangular air duct.

8. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: Two rectangular air ducts (13) are arranged around the discharge port of the silo (19) to form two low-pressure air curtains to isolate the internal and external air flows. A positive pressure fan supplies air with a supply pressure of 80Pa to 120Pa. The air outlet structure is a strip-type. The induced air flow velocity on the lower side of the ton bag (2) is greater than the escape velocity of the dust and is taken as 0.6m / s to 1.0m / s.

9. A combined ton bag throwing and unloading enclosed dust suppression device as claimed in claim 1, characterized in that: A flexible cloth slide (15) is installed at the lower part of the discharge port of the silo (19), and the outer extension length of the flexible cloth slide (15) is 0.8m to 1.2m. The flexible cloth slide (15) is wrapped with a 50mm to 80mm wide hard plastic plate every 0.3m to 0.5m on the outer side; the spring group (17) is made of helical springs of the same specification, type and size, and the elastic coefficient is determined according to the weight of the ton bag (2) and the height of the discharge port of the silo (19), and the value range is 15kN / m to 30kN / m.

10. The combined use of bulk bag throwing and unloading enclosed dust suppression device as claimed in claim 2, characterized in that: A braided spring (17) is installed at the lower part of the patterned support plate (16), and the lower part of the braided spring (17) is installed and fixed on the slow-setting soil bottom plate (18); the angle between the outer wall of the conical chute (10) and the horizontal plane is greater than the repose angle of the material in the ton bag (2); the contact length between the inner wall of the conical chute (10) and the surface of the ton bag (2) is 200 to 400 mm; the outer wall of the conical chute (10) and the horizontal plane are The angle of the surface is 60° to 75°; the "cross" shaped cutting knife (1) is welded by four arc-shaped blades intersecting vertically, and the blade surface faces the side of the operating surface; the push-pull rod (5) is made of φ12 to φ18 threaded steel bars; the "slit" type dust suction port (11) is installed 500mm to 600mm below the top of the conical chute (10), with an annular opening left around it, the width of the slit is 200 to 250mm, and is connected to the conical chute through a rectangular air duct To the external dust removal equipment; two rectangular air ducts (13) are arranged around the discharge port of the silo (19) to form two low-pressure air curtains to isolate the internal and external air flows; the positive pressure fan supplies air, the air supply pressure is 80Pa~120Pa, the air outlet structure is a strip type, the induced air flow velocity on the lower side of the ton bag (2) is greater than the escape velocity of the dust, and the value is 0.6m / s~1.0m / s; a flexible sliding cloth (1) is installed at the lower part of the discharge port of the silo (19) 5), the outer extension length of the flexible chute (15) is 0.8m to 1.2m, and a circle of 50mm to 80mm wide hard plastic plate is wrapped on the outer side of the flexible chute (15) every 0.3m to 0.5m; the spring group (17) is made of helical springs of the same specification, type and size, and the elastic coefficient is determined according to the weight of the ton bag (2) and the height of the discharge port of the silo (19), and the value range is 15kN / m to 30kN / m.

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