Anti-backflow screw feeder

Abstract

The utility model relates to the technical field of screw feeders, and discloses an anti-backflow screw feeder which comprises a gear motor, a transmission case, an air pump, a material storage box and a conveying cylinder which are fixedly installed on a base, the two ends of the upper side of the conveying cylinder are communicated with the material storage box and a flange pipe respectively, and a rotating cylinder is rotatably installed in the conveying cylinder. A second spiral sheet is fixedly mounted on the circumferential side of the rotary drum; and the end, away from the flange pipe, of the rotating cylinder penetrates through the transmission box and is connected and assembled with the output end of the air pump through a rotating joint, the circumferential side of the rotating cylinder communicates with an exhaust pipe used for outputting high-pressure inert gas, the lower side of the conveying cylinder communicates with a discharging pipe, and a pressure stabilizing structure is installed on the upper side of the flange pipe. When the second spiral piece conveys materials in a pressurized mode, the air pump can input inert gas into the rotary drum through the rotary connector and finally discharge the inert gas from the exhaust pipe, so that the pressure in the conveying drum is close to the pressure in the pressure container, and the backward flowing phenomenon caused by pressure difference is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of screw feeders, in particular to a screw feeder for preventing backflow. Background Technique

[0002] In the use of screw feeders, there are often working conditions where it is necessary to feed materials into a container with a certain pressure (such as a chlorination furnace). Due to the existence of a pressure difference, normal screw feeders will experience backflow phenomena, resulting in unsmooth material transportation and affecting the feeding amount.

[0003] Currently, the way to prevent backflow is to change the shape of the spiral blades, that is, the diameter of the spiral blades gradually decreases along the conveying direction of the conveying cylinder. During the rotation of the spiral blades, it plays a role in pressurizing and conveying the materials to ensure that the pressure in the screw feeder is close to the pressure in the pressure vessel, so that the materials can be smoothly added; however, the input amount of the materials also needs to be precisely controlled. During the slow input of the materials, the rotation speed of the spiral blades is relatively low and cannot generate enough pressure. Therefore, the effect of preventing backflow is not good.

[0004] In order to solve the above problems, a screw feeder for preventing backflow is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a screw feeder for preventing backflow, which can compensate for the pressure by additionally adding inert gas and can be flexibly adjusted, thereby solving the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A screw feeder for preventing backflow, including a reduction motor, a transmission box, an air pump, a storage box, and a conveying cylinder fixedly installed on a base. The left end of the upper side of the conveying cylinder is connected and installed with a storage box, and the right end of the upper side of the conveying cylinder is connected and installed with a flange pipe. A rotating cylinder is rotatably installed inside the conveying cylinder. A second spiral blade is fixedly installed on the circumferential side of the rotating cylinder. The side of the conveying cylinder far from the flange pipe and the end of the storage box far from the flange pipe are fixedly installed with the same transmission box; the end of the rotating cylinder far from the flange pipe passes through the transmission box and is connected and assembled with the output end of the air pump through a rotary joint. An exhaust pipe for outputting high-pressure inert gas is connected and installed on the circumferential side of the rotating cylinder. The exhaust pipe is located between the storage box and the flange pipe. The lower side of the conveying cylinder is connected and installed with a discharge pipe, and a pressure stabilizing structure is installed on the upper side of the flange pipe.

[0007] Specifically, the pressure stabilizing structure includes a metal bellows and a rubber sheet. The lower end of the metal bellows is connected and assembled with the flange pipe. The upper end of the metal bellows is connected and installed with a rubber sheet and a pair of flange rings. The rubber sheet is located between the pair of flange rings.

[0008] Further, a ventilation net is fixedly installed inside the flange ring, and the center of the ventilation net bulges away from the rubber sheet in a bowl shape.

[0009] Further, a reactive power area is provided at one end of the rotary drum close to the flange pipe. The discharge pipe is located below the reactive power area, and the flange pipe is located above the reactive power area.

[0010] Specifically, the exhaust pipes are evenly distributed in a spiral shape, and the number of the exhaust pipes is 2 to 8.

[0011] Further, the output end of the exhaust pipe is inclined to the right, and the included angle between the axis of the exhaust pipe and the axis of the rotary drum is 30° to 45°.

[0012] Further, a micro check valve is fixedly installed at the output end of the exhaust pipe.

[0013] Specifically, the diameter of the second spiral blade gradually decreases along the conveying direction of the conveying cylinder. A wear-resistant cylinder is fixedly installed inside the conveying cylinder. The inner shape of the wear-resistant cylinder is adapted to the second spiral blade. The wear-resistant cylinder is located between the material storage box and the flange pipe.

[0014] Specifically, one end of the material storage box is hinged with a box cover through a hinge, and a lock structure for locking the box cover is installed at the other end of the material storage box.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: while the second spiral blade conveys the material under pressure, the air pump can input inert gas into the rotary drum through the rotary joint and finally discharge it from the exhaust pipe to achieve the effect of supplementing pressure, so that the pressure inside the conveying cylinder is close to the pressure in the pressure vessel, and the phenomenon of backflow due to pressure difference during connection is avoided.

[0016] The setting of the pressure stabilizing structure can absorb unstable pressure by deforming, and further avoid the generation of backflow phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the main structural schematic view of the present utility model;

[0018] Figure 2 is the structural schematic sectional view of the present utility model;

[0019] Figure 3 is the structural schematic sectional view at the exhaust pipe of the present utility model;

[0020] Figure 4 is the structural schematic sectional view at the pressure stabilizing structure of the present utility model.

[0021] In the figure: 1 base, 2 exhaust pipe, 3 second spiral fin, 4 rotating cylinder, 5 discharge pipe, 6 flange pipe, 7 metal bellows, 8 rubber sheet, 9 breathable net, 10 wear-resistant cylinder, 11 conveying cylinder, 12 rotating shaft, 13 first spiral fin, 14 flange ring, 15 micro check valve, 16 buckle, 17 box cover, 18 storage box, 19 transmission box, 20 reduction motor, 21 air pump, 22 rotary joint. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figure 1 and Figure 2 , the present invention provides a spiral feeder with anti-backflow, including a reduction motor 20, a transmission box 19, an air pump 21, a storage box 18 and a conveying cylinder 11 fixedly installed on a base 1. The left end of the upper side of the conveying cylinder 11 is communicated and installed with a storage box 18, and the right end of the upper side of the conveying cylinder 11 is communicated and installed with a flange pipe 6. A rotating cylinder 4 is rotatably installed inside the conveying cylinder 11, and a second spiral fin 3 is fixedly installed on the circumferential side of the rotating cylinder 4. The side of the conveying cylinder 11 away from the flange pipe 6 and the end of the storage box 18 away from the flange pipe 6 are fixedly installed with the same transmission box 19.

[0024] In the existing structure of the spiral feeder, a rotating shaft 12 is rotatably installed inside the storage box 18, and a first spiral fin 13 is fixedly installed on the circumferential side of the rotating shaft 12. A transmission structure connecting the rotating shaft 12 and the rotating cylinder 4 is arranged inside the transmission box 19. The transmission structure can adopt the method of sprockets and chains, that is, sprockets are fixedly installed on the circumferential sides of the rotating shaft 12 and the rotating cylinder 4, and the sprockets are located inside the transmission box 19, and a chain is installed between the two sprockets, which can ensure the stability of power transmission.

[0025] The output end of the reduction motor 20 extends into the transmission box 19 and is connected to the rotating shaft 12 through a coupling. When the reduction motor 20 works, it can rotate the rotating shaft 12 and the first spiral fin 13, which can stir the materials stored in the storage box 18, avoid affecting the transportation process of the materials entering the conveying cylinder 11 downward due to material accumulation, and at the same time, after being transmitted by the transmission structure, it can rotate the rotating cylinder 4 and the second spiral fin 3 to convey the materials entering from the storage box 18 to the end close to the flange pipe 6.

[0026] In the area of improvement and innovation, one end of the rotary drum 4 away from the flange pipe 6 passes through the transmission box 19 and is connected and assembled with the output end of the air pump 21 through a rotary joint 22. An exhaust pipe 2 for outputting high-pressure inert gas is connected and installed on the circumferential side of the rotary drum 4. The exhaust pipe 2 is located between the storage bin 18 and the flange pipe 6. The input end of the air pump 21 is connected and assembled with an external inert gas storage tank. When the air pump 21 works, it can input inert gas (such as helium) into the rotary drum 4 through the rotary joint 22 and finally discharge it from the exhaust pipe 2, so as to pressurize the side of the conveying cylinder 11 close to the flange pipe 6, and the setting of the rotary joint 22 will not affect the rotation of the rotary drum 4.

[0027] A discharge pipe 5 is connected and installed on the lower side of the conveying cylinder 11. The discharge pipe 5 is used to discharge materials. A pressure stabilizing structure is installed on the upper side of the flange pipe 6. The pressure stabilizing structure is used to balance the internal pressure.

[0028] Specifically, please refer to Figure 4 , the pressure stabilizing structure includes a metal bellows 7 and a rubber sheet 8. The lower end of the metal bellows 7 is connected and assembled with the flange pipe 6. The upper end of the metal bellows 7 is connected and installed with a rubber sheet 8 and a pair of flange rings 14. The rubber sheet 8 is located between the pair of flange rings 14. The rubber sheet 8 is relatively soft and will deform prior to the metal bellows 7, playing a role in balancing the air pressure in a small amount. After the rubber sheet 8 deforms to the maximum amount, the metal bellows 7 will also undergo adaptive elongation or shortening to further balance the air pressure. Through the combination of the two deformation methods, the air pressure inside the wear-resistant cylinder 10 can be ensured to tend to be stable, which is beneficial to the conveying of materials.

[0029] Ventilation meshes 9 are fixedly installed inside the flange rings 14. When the rubber sheet 8 deforms upward or downward to the maximum position, it abuts against the ventilation meshes 9. The ventilation meshes 9 play a protective role to prevent the rubber sheet 8 from being damaged due to excessive deformation. The center of the ventilation mesh 9 is provided with a bowl-shaped bulge away from the rubber sheet 8, which is more in line with the shape of the rubber sheet 8 after deformation. The ventilation mesh 9 is formed by stamping and punching a metal plate, with high strength, and can provide uniform and sufficient supporting force for the rubber sheet 8 deformed to the maximum amount.

[0030] One end of the rotary drum 4 close to the flange pipe 6 is provided with a reactive zone (i.e., the part of the circumferential side of the rotary drum 4 where the second helical fin 3 is not provided). The discharge pipe 5 is located below the reactive zone, and the flange pipe 6 is located above the reactive zone. The position of the pressure stabilizing structure directly facing the discharge pipe 5 can more directly bear the pressure from the discharge pipe 5, and the adjustment effect is good. In addition, the setting of the reactive zone can prevent the pressure from the discharge pipe 5 from acting on the second helical fin 3 and direct the pressure into the conveying cylinder 11.

[0031] Specifically, the exhaust pipes 2 are uniformly distributed in a spiral shape, and the number of the exhaust pipes 2 is 2 to 8 to ensure the demand for exhaust volume and the uniformity of exhaust pressurization.

[0032] Please refer to Figure 3 The output end of the exhaust pipe 2 is inclined to the right, and the included angle between the axis of the exhaust pipe 2 and the axis of the rotary drum 4 is 30° to 45°, so as to ensure that the exhaust can be pressurized to the right while not affecting the process of material transportation.

[0033] A micro check valve 15 is fixedly installed at the output end of the exhaust pipe 2. The micro check valve 15 can prevent the material from entering the exhaust pipe 2 accidentally under unstable pressure conditions, improving the stability of exhaust transportation.

[0034] Specifically, the diameter of the second spiral blade 3 gradually decreases along the conveying direction of the conveying cylinder 11. A wear-resistant cylinder 10 is fixedly installed inside the conveying cylinder 11. The internal shape of the wear-resistant cylinder 10 is adapted to the second spiral blade 3, that is, the inner diameter of the end of the wear-resistant cylinder 10 far from the flange pipe 6 is larger than the inner diameter of the end close to the flange pipe 6. The wear-resistant cylinder 10 is located between the storage box 18 and the flange pipe 6; the wear-resistant cylinder 10 is made of wear-resistant material (such as high manganese steel), and the shapes of the wear-resistant cylinder 10 and the second spiral blade 3 have the effect of pressurizing towards the discharge pipe 5, thereby preventing gas backflow.

[0035] Specifically, one end of the storage box 18 is hinged with a box cover 17 through a hinge, and a lock structure for locking the box cover 17 is installed at the other end of the storage box 18; the lock structure includes a buckle 16 and a hook. The buckle 16 is fixedly installed on the side wall of the storage box 18 far from the hinge, and the hook is fixedly installed on the side wall of the box cover 17 far from the hinge. After the box cover 17 is buckled, the locking can be completed through the hanging connection of the buckle 16 and the hook, and the disassembly is convenient.

[0036] To improve the sealing performance when the box cover 17 and the storage box 18 are buckled, a rubber sealing ring can also be bonded to the lower side of the box cover 17.

[0037] A control cabinet is also fixedly installed on the upper side of the base 1. The reduction motor 20 and the air pump 21 are electrically connected to the controller in the control cabinet.

[0038] The working principle of this embodiment:

[0039] During installation, the base 1 is installed on the support platform, and the discharge pipe 5 is connected and assembled to the feed port of the pressure vessel through an electromagnetic butterfly valve.

[0040] Before work, the material to be added is stored in the storage box 18, the box cover 17 is buckled and locked and sealed through the lock structure.

[0041] During work, the reduction motor 20 drives the rotating shaft 12 and the first spiral blade 13 to rotate, stir the stored material, and at the same time, the rotary drum 4 and the second spiral blade 3 can be rotated through the transmission of the transmission structure, and the material at the storage box 18 is pressurized and conveyed to the discharge pipe 5 and discharged into the pressure vessel.

[0042] Meanwhile, the air pump 21 can input inert gas (such as helium) into the rotary drum 4 through the rotary joint 22 and finally discharge it from the exhaust pipe 2. When the rotational speed of the second helical fin 3 is low, the output power of the air pump 21 is increased; when the rotational speed of the second helical fin 3 is high, the output power of the air pump 21 is decreased, so as to ensure that the pressure in the conveying cylinder 11 is close to the pressure in the pressure vessel and avoid backflow caused by excessive pressure in the pressure vessel.

[0043] In addition, the voltage stabilizing structure can adjust the pressure at the discharge pipe 5 through two deformation methods. Especially at the moment when the electromagnetic butterfly valve is opened, the fluctuation amount of the pressure can be reduced to achieve the function of voltage stabilization, further avoiding the occurrence of backflow phenomenon.

[0044] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A screw feeder for preventing backflow, comprising a reduction motor (20), a transmission box (19), an air pump (21), a material storage box (18) and a conveying cylinder (11) fixedly mounted on a base (1), characterized in that: The left end of the upper side of the conveying cylinder (11) is connected to and installed with a material storage box (18), and the right end of the upper side of the conveying cylinder (11) is connected to and installed with a flange pipe (6). A rotating cylinder (4) is rotatably installed inside the conveying cylinder (11), and a second spiral sheet (3) is fixedly installed on the circumferential side of the rotating cylinder (4). The side of the conveying cylinder (11) away from the flange pipe (6) and the end of the material storage box (18) away from the flange pipe (6) are fixedly installed with the same transmission box (19); the end of the rotating cylinder (4) away from the flange pipe (6) passes through the transmission box (19) and is connected and assembled with the output end of the air pump (21) through a rotating joint (22); the circumferential side of the rotating cylinder (4) is connected to and installed with an exhaust pipe (2) for outputting high-pressure inert gas, and the exhaust pipe (2) is located between the material storage box (18) and the flange pipe (6); the lower side of the conveying cylinder (11) is connected to and installed with a discharge pipe (5), and the upper side of the flange pipe (6) is installed with a pressure stabilizing structure; The voltage stabilizing structure comprises a metal bellows (7) and a rubber sheet (8); the lower end of the metal bellows (7) is connected and assembled with the flange pipe (6); the upper end of the metal bellows (7) is connected and installed with the rubber sheet (8) and a pair of flange rings (14); the rubber sheet (8) is located between the pair of flange rings (14).

2. The anti-backflow screw feeder according to claim 1, characterized in that: A breathable net (9) is fixedly installed in each of the flange rings (14), and the center of the breathable net (9) is arranged to be bowl-shaped and bulge towards a side away from the rubber sheet (8).

3. The anti-backflow screw feeder according to claim 1, characterized in that: An idle zone is provided at one end of the rotating drum (4) close to the flange pipe (6), the discharge pipe (5) is located below the idle zone, and the flange pipe (6) is located above the idle zone.

4. The anti-backflow screw feeder according to claim 1, characterized in that: The exhaust pipes (2) are evenly distributed in a spiral shape, and the number of the exhaust pipes (2) is 2 to 8.

5. The anti-backflow screw feeder according to claim 1, characterized in that: The output end of the exhaust pipe (2) is arranged to be tilted to the right, and the angle between the axis of the exhaust pipe (2) and the axis of the drum (4) is 30° to 45°.

6. The anti-backflow screw feeder according to claim 1, characterized in that: A micro one-way valve (15) is fixedly mounted on the output end of the exhaust pipe (2).

7. The anti-backflow screw feeder according to claim 1, characterized in that: The diameter of the second spiral sheet (3) gradually decreases along the conveying direction of the conveying cylinder (11); a wear-resistant cylinder (10) is fixedly installed inside the conveying cylinder (11); the internal shape of the wear-resistant cylinder (10) is compatible with the second spiral sheet (3); and the wear-resistant cylinder (10) is located between the material storage box (18) and the flange pipe (6).

8. The anti-backflow screw feeder according to claim 1, characterized in that: One end of the material storage box (18) is hingedly connected to a box cover (17) via a hinge, and the other end of the material storage box (18) is provided with a lock structure for locking the box cover (17).

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