A fully enclosed underground negative pressure tobacco stem feeding device

Abstract

The present invention discloses a fully enclosed underground negative pressure tobacco stem feeding device, the feeding device comprising a belt conveyor (1), a foundation pit (23), a dust removal duct (4), a material discharge port (6), and an air suction chamber, wherein a first-stage grille (7) and a second-stage grille (8) are arranged below the material discharge port, and the device is characterized in that: the air suction chamber comprises an air chamber front bottom plate (5), an air chamber rear bottom plate (9), and left and right air chamber side plates (16), the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates are located at the periphery of the material discharge port, the air chamber front bottom plate, the air chamber rear bottom plate, the left and right air chamber side plates, the material discharge port, and the foundation pit cover plate (10) together constitute the air suction chamber, and the air suction inlet of the air suction chamber is formed between the lower end periphery of the material discharge port and the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates. The fully enclosed underground negative pressure tobacco stem loading device facilitates material pouring and reduces labor intensity; a suction port is provided between the suction chamber and the material pouring port, which can form a downward / suction airflow at the material pouring port to take away the dust generated during material pouring and prevent the dust from spreading to the space above the ground, thereby effectively solving the problem of dust raised during material pouring.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco silk making equipment and tobacco production, and in particular to a fully enclosed underground negative pressure tobacco stem feeding device. Background Art

[0002] At present, the main raw materials of cigarette factories are tobacco slices, tobacco stems, and flakes. Among them, tobacco stems are generally packaged in sacks. Since the incoming tobacco stems are relatively dry (with a moisture content of about 12%), a lot of dust will be generated when they are put into use on the production line, especially at the loading port of the equipment in the stem packing room. When the operator pours the tobacco stems from the sack into the loading equipment, a lot of dust will be generated. The loading equipment is generally a belt conveyor installed on the floor of the stem packing room. When loading, the operator needs to lift the sack above the belt conveyor hopper to pour the tobacco stems into the equipment, and then the belt conveyor will send it to the downstream equipment. Equipment (such as feeders, etc.), the labor intensity of operators is high. When pouring materials, the pouring port will generate a lot of dust. Since the upper edge of the pouring port is at a certain height from the ground, and the operator usually stands on the ground to pour materials, the dust point is close to the operator's mouth and nose, which is very harmful to occupational health. In order to exhaust the dust, the usual practice is to install a dust hood above the pouring port. Since an operating space must be left between the dust hood and the belt conveyor hopper, the dust collection effect is often poor. In addition, subsequent equipment will also generate dust. The stem packing room has become a dusty area in the cigarette factory, and the environment is relatively poor. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of large dust generation in the tobacco stem opening room, especially high labor intensity of operators when loading tobacco stems and large dust generation at the pouring port, and to provide a fully enclosed underground negative pressure tobacco stem loading device.

[0004] The objective of the present invention is achieved through the following technical scheme: the tobacco stem discharge port is changed from above the ground to below the ground, that is, the feeding belt conveyor is placed in the underground foundation pit, and the upper edge of the discharge port is flush with the ground, thereby reducing the labor intensity of the operator in discharge; a steel plate is installed on the underground foundation pit, and the steel plate is flush with the ground. A sealing strip is used to seal the steel plate and the belt conveyor frame to prevent tobacco stems and dust from falling into the foundation pit, and an air suction channel is installed between the discharge port and the feed hopper of the belt conveyor. The discharge port, feed hopper, air suction channel, belt of the belt conveyor, and wall panels separate the underground foundation pit space, that is, tobacco stems and dust will not fall into the foundation pit when discharge. The above design realizes effective sealing between the underground foundation pit and the discharge port and the feed hopper of the belt conveyor. The suction channel is connected to the dust removal pipe, and a suction port is opened between the back of the pouring port and the suction channel, which can discharge the air around the pouring port from the dust removal pipe through the suction channel, that is, a certain negative pressure can be formed in the pouring port and the hopper space. This negative pressure can form a suction airflow from top to bottom at the pouring port. The dust generated when pouring is brought into the suction channel through this airflow and sent to the dust collector through the dust removal pipe for treatment. A first-level grille is installed below the pouring port. This grille can provide support for the sack mouth when pouring, which is convenient for pouring. A second-level grille is installed below the first-level grille and above the belt surface of the belt conveyor. When the belt conveyor is running, this grille controls the material layer height to play a role in material leveling.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A fully enclosed underground negative pressure tobacco stem feeding device, the feeding device comprising a belt conveyor (1), a foundation pit (23), a dust removal pipeline (4), a material discharge port (6), and an air suction chamber, the belt conveyor having a conveying belt, the conveying belt being arranged at an angle, one end of the dust removal pipeline being connected to the lower part of the material discharge port through the air suction chamber, the other end of the dust removal pipeline being connected to a regulating valve, a foundation pit cover plate (10) being arranged on the foundation pit, the upper surface of the foundation pit cover plate being substantially flush with the ground (13), the upper end of the material discharge port being connected to the foundation pit cover plate, the upper surface of the material discharge port being substantially flush with the ground or slightly lower than the ground, the lower part of the material discharge port being A first-stage grille (7) and a second-stage grille (8) are provided, wherein the first-stage grille is located above the second-stage grille, and the second-stage grille is arranged obliquely, and is characterized in that: the air suction chamber comprises an air chamber front bottom plate (5), an air chamber rear bottom plate (9), and left and right air chamber side plates (16), wherein the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates are located at the periphery of the material discharge port, and the air chamber front bottom plate, the air chamber rear bottom plate, the left and right air chamber side plates, the material discharge port, and the foundation pit cover plate together constitute the air suction chamber, and the air suction inlet of the air suction chamber is formed between the lower end periphery of the material discharge port and the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates.

[0007] Furthermore, each bottom plate of the air chamber has a first vertical portion (25) at one end adjacent to the discharge port, the discharge port is a conical discharge port, and the discharge port includes a conical portion, a second vertical portion, and a horizontal portion (26) in sequence, the first vertical portion and the second vertical portion are arranged in parallel, and a suction inlet gap (G) is formed between the first vertical portion 25 and the horizontal portion 26.

[0008] Furthermore, the suction inlet gap (G) forms a connecting area between the suction chamber and the lower hopper. Furthermore, the conveyor belt is arranged parallel to the inclined surface of the foundation pit, and there is an angle a between the conveyor belt 2 and the horizontal plane, a=10-30°; there is an angle b between the second-level grille and the conveyor belt, b=1-10°.

[0009] Furthermore, the foundation pit cover is installed on the cover bracket, the cover bracket is connected to the lower surface of the foundation pit cover, the cover bracket is fixed on the embedded parts, a detachable stacking ladder is installed in the foundation pit, an inspection door is opened above the detachable stacking ladder, one or more cleaning openings are opened on the left side of the foundation pit cover, and a sealing strip is used to seal the belt conveyor and the foundation pit cover.

[0010] Furthermore, the lower end of the discharge port is connected to the belt conveyor through the belt conveyor hopper and the wall panel in sequence. The front bottom plate of the air chamber, the left and right side panels of the air chamber, the rear bottom plate of the air chamber, the belt conveyor hopper and the wall panel separate the belt conveyor hopper space from the foundation pit space to prevent the tobacco stems in the belt conveyor hopper from falling into the foundation pit.

[0011] Furthermore, the regulating valve can adjust the suction flow rate, and the angle of the second-stage grille can be adjusted within a range of 1-10°. The suction flow rate of the regulating valve and / or the angle of the second-stage grille can be adjusted according to the amount of material being discharged and the actual effect.

[0012] The beneficial effects of the present invention are as follows: the fully enclosed underground negative pressure tobacco stem feeding device (1) places the belt conveyor feed hopper in the foundation pit below the ground, which is convenient for pouring and reduces labor intensity. The foundation pit cover plate realizes the sealing of the ground and the foundation pit; the pouring port, the suction channel, the belt conveyor feed hopper, the belt conveyor belt, and the wall panel separate the underground foundation pit space, so that an effective seal is formed between the foundation pit and the pouring hopper, preventing tobacco stem dust from falling into the foundation pit, reducing equipment leakage, and thus reducing the cleaning workload. (2) An air suction port is provided between the suction chamber and the pouring port, which can form a downward / suction airflow at the pouring port to take away the dust generated during pouring and prevent the dust from spreading to the space above the ground, thereby effectively solving the dust problem caused by pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a front view of the structure of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention;

[0014] FIG2 is a top view of the structure of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention;

[0015] Figure 3 It is a side view of the structure of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention;

[0016] Figure 4 It is a partially enlarged structural schematic diagram of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention;

[0017] Figure 5 Schematic diagram of the foundation pit structure of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention; (a) front view, (b) top view, (c) side view;

[0018] Figure 6 Schematic diagram of the structure of the fully enclosed underground negative pressure tobacco stem feeding device of the present invention; (a) front view, (b) top view, (c) side view.

[0019] In the figure: belt conveyor 1, conveyor belt 2, regulating valve 3, dust removal duct 4, front bottom plate of air chamber 5, pouring port 6, first-stage grille 7, second-stage grille 8, rear bottom plate of air chamber 9, foundation pit cover 10, cover bracket 11, embedded parts 12, ground 13, wall panel 14, belt conveyor hopper 15, air chamber side plate 16, folding ladder 17, maintenance space 18, sealing strip 20, cleaning port 21, air chamber area 22, foundation pit 23, foundation pit inclined surface 24, first vertical portion 25, horizontal portion 26. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1-6As shown, a fully enclosed underground negative pressure tobacco stem feeding device comprises a belt conveyor 1, a foundation pit 23, a dust removal pipe 4, a discharge port 6, and an air suction chamber. The belt conveyor 1 has a conveying belt 2, and the conveying belt 2 is arranged at an angle. One end of the dust removal pipe 4 is connected to the lower part of the discharge port 6 through the air suction chamber, and the other end of the dust removal pipe 4 is connected to a regulating valve 3. A foundation pit cover 10 is arranged on the foundation pit 23, and the upper surface of the foundation pit cover 10 is substantially flush with the ground 13. The upper end of the discharge port 6 is connected to the foundation pit cover 10, and the upper surface of the discharge port 6 is substantially flush with the ground 13 or slightly lower than the ground 13. A first-stage grille 7 and a second-stage grille 8 are arranged below the discharge port 6. The first-stage grille 7 is located on the upper part of the second-stage grille 8, and the second-stage grille 8 is arranged at an angle.

[0023] The suction chamber includes a front bottom plate 5, a rear bottom plate 9, and left and right side plates 16. The front bottom plate 5, the rear bottom plate 9, and the left and right side plates 16 are located at the periphery / outer periphery of the material discharge port 6. The front bottom plate 5, the rear bottom plate 9, the left and right side plates 16, the material discharge port 6, and the foundation pit cover 10 together constitute the suction chamber. The lower end periphery of the material discharge port 6 and the front bottom plate 5, the rear bottom plate 9, and the left and right side plates 16 constitute the suction inlet of the suction chamber.

[0024] like Figure 4 As shown, one end of the front bottom plate 5 of the air chamber adjacent to the pouring port 6 has a first vertical portion 25, and the pouring port 6 is a conical pouring port. The pouring port 6 includes a conical portion, a second vertical portion, and a horizontal portion 26 in sequence. The first vertical portion 25 is arranged parallel to the second vertical portion, and a suction inlet gap G is formed between the first vertical portion 25 and the horizontal portion 26. The suction inlet gap G forms a connecting area between the suction chamber and the lower hopper.

[0025] like Figure 1-3As shown, a fully enclosed underground negative pressure tobacco stem feeding device includes a belt conveyor 1, a dust removal duct 4, a front bottom plate of the air chamber 5, a discharge port 6, a first-level grille 7, a second-level grille 8, a rear bottom plate of the air chamber 9, a foundation pit cover 10, a cover bracket 11, embedded parts 12, a side plate of the air chamber 16, a dismantling ladder 17, an inspection door 19, a cleaning port 21, a foundation pit 23 and other components / assemblies. The tobacco stems are poured in from the discharge port 6, and the first-level grille 7 can support the mouth of the sack to facilitate the discharge, and can also play a protective role. The tobacco stems are accumulated on the belt of the belt conveyor 1 and the second-level grille 8. When the conveyor belt 2 of the belt conveyor is running, the tobacco stems on the belt conveyor are driven to be transported along the belt surface. The second-level grille 8 combs the tobacco stems to make the feeding layer of the belt conveyor uniform. An air suction passage / suction chamber is formed between the pouring port 6, the foundation pit cover 10, the front bottom plate 5 of the wind chamber, the side plates 16 of the wind chamber, and the rear bottom plate 9 of the wind chamber. This air passage / suction chamber is connected to the dust removal pipe 4. The air around the pouring port 6 is sucked into the suction chamber through the gap between the pouring port 6 and the bottom plates and side plates of the wind chamber, thereby forming a negative pressure zone near the pouring port 6 to prevent dust from spreading outward. The suction volume can be adjusted by the regulating valve 3. The foundation pit cover 10 is installed on the cover bracket 11, and the upper surface is flush with the ground 13. The cover bracket 11 is connected to the lower surface of the foundation pit cover 10, and the cover bracket 11 is fixed on the embedded part 12. A detachable stacking ladder 17 is installed in the foundation pit 23 to facilitate entry and exit of the foundation pit for repair and maintenance. An inspection door 19 is opened above the detachable stacking ladder 17. The inspection door is equipped with a gas spring to reduce the opening tension. One or more cleaning ports 21 are opened on the left side of the foundation pit cover 10 to facilitate cleaning of the foundation pit. The belt conveyor 1 and the foundation pit cover 10 are sealed with a sealing strip 20 to prevent tobacco stem dust from falling into the foundation pit.

[0026] like Figure 5 As shown, the foundation pit 23 adopts a reinforced concrete structure, an embedded part 12 is installed at the foundation pit mouth, the cover plate bracket 11 is fixed on the embedded part 12, and the foundation pit is provided with an inspection space 18 to facilitate the maintenance of the belt conveyor.

[0027] like Figure 1-6 As shown, the foundation pit cover 10, the front bottom plate 5 of the air chamber, the left and right side plates 16 of the air chamber (one each on the left and right), the rear bottom plate 9 of the air chamber and the pouring port 6 form a suction chamber (such as the area between the dotted area 22 and the pouring port 6). The suction port of the suction chamber is on the back / periphery of the pouring port 6. The air near the pouring port 6 is sucked into the suction channel through the suction port, thereby forming a negative pressure at the pouring port to prevent dust from overflowing. The lower end of the pouring port 6 is connected to the belt conveyor 1 through the belt conveyor hopper 15 and the wall panel 14 in turn. The front bottom plate 5 of the air chamber, the left and right side plates 16 of the air chamber, the rear bottom plate 9 of the air chamber, the belt conveyor hopper 15, and the wall panel 14 separate the hopper space from the foundation pit space to prevent the tobacco stems in the hopper from falling into the foundation pit.

[0028] The conveyor belt 2 is arranged parallel to the foundation pit inclined surface 24, and there is an angle a between the conveyor belt 2 / foundation pit inclined surface 24 and the horizontal plane, a=10-30°; there is an angle b between the second-stage grille 8 and the conveyor belt 2, b=2-6°, which can ensure efficient dust collection of the dust removal pipeline 4 while facilitating transportation. The inclination angle b and the air suction inlet gap G and the regulating valve 3 have interrelated control factors / regulatory relationships. The regulating valve 3 can adjust the air suction flow, and the angle of the second-stage grille 8 / the angle with the belt surface can be adjusted, and the angle adjustment range is 1-10°. The air suction flow of the regulating valve 3 and / or the angle of the second-stage grille 8 can be adjusted according to the amount of material being discharged.

[0029] The fully enclosed underground negative pressure tobacco stem feeding device is installed in a foundation pit 23 below the ground, which can reduce the labor intensity when pouring materials; negative pressure can be formed at the pouring port and the area below, and the dust generated when pouring materials will not spread outward; the foundation pit is separated from the space above the ground by a foundation pit cover plate to achieve full closure of the foundation pit, and the pouring port, belt conveyor hopper, and air chamber plate can separate the hopper from the internal space of the foundation pit, so that tobacco stems and dust will not fall into the foundation pit. The pouring port 6 is flush with or slightly lower than the ground, and the foundation pit plane outside the pouring port 6 is separated from the ground by a foundation pit cover 10 to prevent tobacco stems and dust from falling into the foundation pit; the hopper below the pouring port 6 is separated from the internal space of the underground foundation pit 23 by the front bottom plate 5 of the wind chamber, the rear bottom plate 9 of the wind chamber, the foundation pit cover 10, the side plates 14 of the wind chamber, the belt conveyor hopper 15, the wall panel 14, and the belt 2 to prevent tobacco stems and dust in the hopper from falling into the foundation pit. The above measures are used to separate the ground, the foundation pit, and the belt conveyor hopper from each other. A suction channel / suction chamber is installed below the pouring port 6, and the suction chamber is connected to the dust removal pipe 4. A suction port is provided between the back side / periphery of the pouring port 6 and the front bottom plate 5, the rear bottom plate 9 and the side plate 16 of the wind chamber. The air around the pouring port can enter the suction channel through the suction port and be sucked away by the dust removal pipe 4, thereby forming a negative pressure in the pouring port and the hopper below. The dust generated during pouring is sucked away through the pouring port, the suction port and the suction channel, thereby achieving the purpose of dust removal.

[0030] A first-stage grille 7 and a second-stage grille 8 are installed below the material discharge port 6. The first-stage grille 7 can support the mouth of the sack to facilitate material discharge and can also play a protective role elsewhere. The second-stage grille 8 can comb the tobacco stems to make the material layer of the belt conveyor uniform. The angle between the axial plane of each baffle rod of the second-stage grille 8 and the belt surface is 1 to 10°.

[0031] The fully enclosed underground negative pressure tobacco stem feeding device (1) places the belt conveyor feed hopper in the foundation pit below the ground to facilitate material unloading and reduce labor intensity. The foundation pit cover plate realizes the sealing of the ground and the foundation pit; the unloading port, the suction channel, the belt conveyor feed hopper, the belt conveyor belt, and the wall plate separate the underground foundation pit space, so that an effective seal is formed between the foundation pit and the unloading hopper to prevent tobacco stem dust from falling into the foundation pit, reduce equipment leakage, and thus reduce the cleaning workload. (2) There is an air suction port between the suction channel and the unloading port, which can form a suction / negative pressure airflow at the unloading port to take away the dust generated during unloading and prevent the dust from spreading to the space below the ground, thereby effectively solving the problem of dust raised during unloading.

[0032] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fully enclosed underground negative pressure tobacco stem feeding device, the feeding device comprising a belt conveyor (1), a foundation pit (23), a dust removal pipeline (4), a material discharge port (6), and an air suction chamber, the belt conveyor having a conveying belt, the conveying belt being arranged at an angle, one end of the dust removal pipeline being connected to the lower part of the material discharge port through the air suction chamber, the other end of the dust removal pipeline being connected to a regulating valve, a foundation pit cover plate (10) being arranged on the foundation pit, the upper surface of the foundation pit cover plate being substantially flush with the ground (13), the upper end of the material discharge port being connected to the foundation pit cover plate, the upper surface of the material discharge port being substantially flush with the ground or slightly lower than the ground, a first-stage grille (7) and a second-stage grille (8) being arranged below the material discharge port, the first-stage grille being located above the second-stage grille, the second-stage grille being arranged at an angle, characterized in that: The suction chamber comprises a front bottom plate (5), a rear bottom plate (9), and left and right side plates (16). The front bottom plate, the rear bottom plate, and the left and right side plates are located at the periphery of the discharge port. The front bottom plate, the rear bottom plate, the left and right side plates, the discharge port, and the foundation pit cover together constitute the suction chamber. The outer periphery of the lower end of the discharge port and the front bottom plate, the rear bottom plate, and the left and right side plates constitute the suction inlet of the suction chamber. The end of the front bottom plate of the air chamber adjacent to the discharge port has a first vertical portion (25). The discharge port is a conical discharge port. The discharge port comprises a conical portion, a second vertical portion, and a horizontal portion (26) in sequence. The first vertical portion is arranged in parallel with the second vertical portion. The first vertical portion (25) and the horizontal portion (26) are arranged in parallel. The conveyor belt (2) and the second-stage grid (26) form an air suction inlet gap (G), and the air suction inlet gap (G) forms a connection area between the suction chamber and the lower hopper; the conveyor belt is arranged parallel to the inclined surface of the foundation pit, and the conveyor belt (2) and the horizontal plane have an angle a, a=10-30°; the second-stage grid and the conveyor belt have an angle b, b=1-10°; the foundation pit cover (10) is installed on the cover bracket, the cover bracket is connected to the lower surface of the foundation pit cover, the cover bracket is fixed to the embedded part, a detachable stacking ladder is installed in the foundation pit, an inspection door is opened above the detachable stacking ladder, one or more cleaning openings are opened on the left side of the foundation pit cover, and a sealing strip is used to seal the belt conveyor and the foundation pit cover.

2. A fully enclosed underground negative pressure tobacco stem feeding device as claimed in claim 1, characterized in that: The lower end of the discharge port is connected to the belt conveyor through the belt conveyor hopper and wall panels in sequence. The front bottom plate of the wind chamber, the left and right wind chamber side panels, the rear bottom plate of the wind chamber, the belt conveyor hopper and the wall panels separate the belt conveyor hopper space from the foundation pit space to prevent the tobacco stems in the belt conveyor hopper from falling into the foundation pit.

3. A fully enclosed underground negative pressure tobacco stem feeding device as claimed in claim 1, characterized in that: The regulating valve can adjust the suction flow rate, and the angle of the second-stage grille can be adjusted within a range of 1-10°. The suction flow rate of the regulating valve and / or the angle of the second-stage grille can be adjusted according to the amount of material being poured and the actual effect.

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