Screw conveyor and method for cleaning thereof

Abstract

The present application belongs to the technical field of dry mixed material conveying and provides a spiral conveying device and a cleaning method thereof, the spiral conveying device comprising a material conveying mechanism, an air inlet mechanism and a dust extraction mechanism, the material conveying mechanism comprising a material conveying pipeline and a sealed bin, the material conveying pipeline being provided with a material distribution valve at a feeding end, the material conveying pipeline being connected with the sealed bin at a discharging end, the air inlet mechanism being in openable and closable communication with a lumen of the material conveying pipeline, and the dust extraction mechanism being used for suction of the material conveying pipeline, wherein the material conveying pipeline is a closed pipeline when the material distribution valve, the sealed bin and the air inlet mechanism are closed. The spiral conveying device in the present application can realize dust-free operation during material conveying due to the sealing of the material conveying pipeline and the sealed bin, and the spiral conveying device which is relatively sealed can be conveniently cleaned by means of the air inlet mechanism and the dust extraction mechanism.

Description

Technical Field

[0001] This invention belongs to the field of dry mixed material conveying technology, specifically relating to a screw conveyor device and its cleaning method. Background Technology

[0002] Screw conveyors are prone to generating dust when transporting dry mixed materials. To address this issue, they are typically sealed to ensure a certain level of airtightness. During material transport, the viscous nature of the material inevitably leads to residue buildup on the inner wall. To prevent mixing of old and new materials and subsequent product quality degradation, the inside of the screw conveyor must be cleaned before each product change. However, even with the sealing process, the internal airflow of these sealed screw conveyors is poor. Traditional cleaning methods, such as dust extraction and material flow flushing, are often insufficient to thoroughly clean the interior, requiring manual disassembly and cleaning, which is extremely cumbersome. Summary of the Invention

[0003] To address the aforementioned deficiencies or shortcomings, this invention provides a screw conveyor device and its cleaning method, aiming to solve the technical problem that cleaning the interior of existing sealed screw conveyors is difficult, and traditional cleaning methods are unlikely to completely clean the interior of the screw conveyor device.

[0004] To achieve the above objectives, the present invention provides a screw conveyor device, wherein the screw conveyor device includes a material conveying mechanism, an air inlet mechanism, and a dust extraction mechanism. The material conveying mechanism includes a material conveying pipe and a sealed hopper. The material conveying pipe is provided with a material distribution valve at its inlet end and connected to the sealed hopper at its outlet end. The air inlet mechanism is closable and connects to the cavity of the material conveying pipe. The dust extraction mechanism is used to extract fluid from the material conveying pipe. When the material distribution valve, the sealed hopper, and the air inlet mechanism are closed, the material conveying pipe is a closed pipe.

[0005] In an embodiment of the present invention, the screw conveyor further includes a purging mechanism, which is disposed on the material conveying mechanism and is used to purge the inner wall of the material conveying pipeline.

[0006] In an embodiment of the present invention, the spiral conveying pipe is provided with an outwardly protruding mounting seat on the pipe wall, and a purging channel communicating with the pipe cavity is formed in the mounting seat. The purging mechanism includes an air nozzle and a high-pressure air source. One end of the air nozzle extends into the purging channel and is connected to the mounting seat, and the other end is connected to the high-pressure air source.

[0007] In an embodiment of the present invention, the material conveying pipeline includes a chute section and a spiral conveying section. The end of the chute section away from the spiral conveying section is the feed end, and the end of the spiral conveying section away from the chute section is the discharge end. An air inlet mechanism is located near the feed end and is disposed on the chute section or on the spiral conveying section. A dust extraction mechanism is located near the discharge end and is disposed on the spiral conveying section or on a sealed silo.

[0008] In an embodiment of the present invention, the air inlet mechanism is provided on the chute section and includes an air inlet pipe and an air inlet valve. One end of the air inlet pipe is connected to the chute section, and the other end is provided with an air inlet valve.

[0009] In an embodiment of the present invention, a dust extraction mechanism is provided on a sealed hopper and includes a dust extraction pipe and a vacuum cleaner. One end of the dust extraction pipe is connected to the sealed hopper, and the other end is connected to the vacuum cleaner.

[0010] In an embodiment of the present invention, the material conveying mechanism further includes a spiral conveying shaft and a drive motor. The spiral conveying shaft is disposed inside the spiral conveying pipe section, and the output end of the drive motor is connected to the spiral conveying shaft.

[0011] In an embodiment of the present invention, the screw conveyor further includes a vibration motor, which is disposed on the outer wall of the sealed hopper.

[0012] In an embodiment of the present invention, the bottom of the sealed silo is also provided with a discharge port, and the discharge port is provided with a discharge valve for opening and closing.

[0013] To achieve the above objectives, the present invention also provides a cleaning method for a screw conveyor, wherein the cleaning method for the screw conveyor can be applied to the screw conveyor according to the above description, and the cleaning method for the screw conveyor includes:

[0014] Close the material distribution valve, seal the hopper and air inlet mechanism to make the material conveying pipeline a closed pipeline;

[0015] Turn on the dust extraction mechanism to create negative pressure inside the material conveying pipeline.

[0016] Open the air intake mechanism and increase the power of the dust extraction mechanism;

[0017] Turn off the dust extraction and air intake mechanisms to complete the cleaning.

[0018] Through the above technical solution, the screw conveyor device provided in the embodiments of the present invention has the following beneficial effects:

[0019] The material conveying mechanism's material conveying pipe connects to the inlet channel at one end via a distribution valve, and to a sealed silo at the other end. The sealed silo collects and temporarily stores materials. A discharge port with a discharge valve is located at the bottom of the sealed silo and connects to a container holding the materials. When the screw conveyor transports materials, the distribution valve and discharge valve open, the air inlet mechanism closes, and the dust extraction mechanism activates. Materials enter the material conveying pipe from the inlet channel, are conveyed by the material conveying mechanism, and finally collect in the sealed silo. The collected materials can then be discharged into a container through the discharge port. Due to the airtightness of the material conveying pipe and the sealed silo, dust-free conveying is achieved. Simultaneously, the dust extraction mechanism removes dust from the material conveying pipe and the sealed silo during material transport, thereby reducing dust density within the pipe. When cleaning of the material conveying mechanism is required, close the dispensing valve and the discharge valve, then open the air inlet and dust extraction mechanisms. The dust extraction mechanism creates a negative pressure inside the material conveying pipe and the sealed hopper. This negative pressure forces outside air to enter the material conveying pipe and the sealed hopper through the air inlet and dust extraction mechanisms, generating a high-speed airflow within them. This airflow blows up and carries away any material remaining on the inner wall of the material conveying pipe, thus cleaning the inner wall. Furthermore, increasing the suction power of the dust extraction mechanism ensures a thorough cleaning of the inner wall. In short, the screw conveyor in this invention achieves dust-free operation during material conveying due to the airtightness of the material conveying pipe and the sealed hopper. The air inlet and dust extraction mechanisms facilitate the cleaning of this relatively sealed screw conveyor.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description. Attached Figure Description

[0021] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a screw conveyor equipped with an air nozzle according to an embodiment of the present invention;

[0023] Figure 2 According to the embodiments of the present invention Figure 1 Enlarged structural diagram at point A;

[0024] Figure 3 According to the embodiments of the present invention Figure 1 Schematic diagram of a spiral conveyor pipeline structure;

[0025] Figure 4This is a schematic diagram of the structure of the flow-aiding air nozzle installed on the spiral conveying pipe according to an embodiment of the present invention;

[0026] Figure 5 According to the embodiments of the present invention Figure 4 Enlarged schematic diagram of the central airflow nozzle;

[0027] Figure 6 This is a flowchart of a cleaning method for a screw conveyor according to an embodiment of the present invention;

[0028] Figure 7 According to the embodiments of the present invention Figure 6 A flowchart detailing the cleaning method for a spiral conveyor.

[0029] Explanation of reference numerals in the attached figures

[0030] Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] The screw conveyor of the present invention will now be described with reference to the accompanying drawings.

[0033] This invention provides a screw conveyor device, such as... Figure 1 As shown, the screw conveyor includes a material conveying mechanism 1, an air inlet mechanism 2, and a dust extraction mechanism 3. The material conveying mechanism 1 includes a material conveying pipe 11 and a sealed silo 12. The material conveying pipe 11 has a material distribution valve 13 at its inlet end 111 and a material outlet end 112 connected to the sealed silo 12. The air inlet mechanism 2 can be opened and closed to connect to the cavity of the material conveying pipe 11. The dust extraction mechanism 3 is used to extract the material conveying pipe 11. When the material distribution valve 13, the sealed silo 12, and the air inlet mechanism 2 are closed, the material conveying pipe 11 is a closed pipe.

[0034] One end of the material conveying pipe 11 in the material conveying mechanism 1 is connected to the feeding channel 5 via a distributing valve 13, and the other end is connected to the sealed silo 12. The sealed silo 12 is used to collect and temporarily store materials. The bottom of the sealed silo 12 is provided with a discharge port, and a discharge valve 121 is provided on the discharge port. The discharge port is used to connect to a container for holding materials. When the screw conveyor conveys materials, the distributing valve 13 and the discharge valve 121 are opened, the air inlet mechanism 2 is closed, and the dust extraction mechanism 3 is opened. The materials enter the material conveying pipe 11 from the feeding channel 5, and then are conveyed by the material conveying mechanism 1, and finally collected in the sealed silo 12. The collected materials can be loaded into the container through the discharge port. Due to the sealing of the material conveying pipe 11 and the sealed silo 12, dust-free conveying can be achieved during material conveying. At the same time, the dust extraction mechanism 3 can extract the dust in the material conveying pipe 11 and the sealed silo 12 during the material conveying process, thereby reducing the dust density in the pipe. When cleaning of the material conveying mechanism 1 is required, the dispensing valve 13 and the discharge valve 121 are closed, and then the air inlet mechanism 2 and the dust extraction mechanism 3 are opened. The dust extraction mechanism 3 creates a negative pressure in the material conveying pipe 11 and the sealed hopper 12. This negative pressure forces outside air to enter the material conveying pipe 11 and the sealed hopper 12 through the air inlet mechanism 2. This creates a high-speed airflow within the material conveying pipe 11 and the sealed hopper 12. The airflow can blow away and carry away the material remaining on the inner wall of the material conveying pipe 11, thus cleaning the inner wall of the material conveying pipe 11. Furthermore, increasing the suction power of the dust extraction mechanism 3 ensures a thorough cleaning of the inner wall. In other words, the screw conveyor in this invention, due to the sealing of the material conveying pipe 11 and the sealed hopper, can achieve dust-free operation during material conveying. The air inlet mechanism 2 and the dust extraction mechanism 3 facilitate the cleaning of this relatively sealed screw conveyor.

[0035] It should be noted that the screw conveyor in this invention, as part of the dry mixing plant, mainly transports the pre-mixed dry materials in the mixing chamber to the sealed silo 12 via a material conveying mechanism. These materials are then packaged at the outlet of the sealed silo 12. To achieve zero dust generation throughout the entire operation, the entire process, from feeding to conveying and packaging, is carried out within a closed channel. Specifically, the feeding channel 5 is sealed to both the mixing chamber and the material conveying mechanism 1. During cleaning, if the distribution valve 13 is opened, the negative pressure generated by the dust extraction mechanism will affect the mixing chamber. Conversely, if the outlet valve 121 is opened, heavier dust from the material conveying pipe 11 and the sealed silo 12 will leak directly from the outlet. Therefore, both the distribution valve 13 and the outlet valve 121 must be closed during cleaning. Since the material conveying mechanism 1 is the main unit for material conveying, residual material tends to remain inside it. Therefore, the cleaning of the screw conveyor in this invention primarily involves cleaning the material conveying mechanism 1.

[0036] like Figure 3 and Figure 4 As shown, in an embodiment of the present invention, the screw conveyor further includes a blowing mechanism 4, which is disposed on the material conveying mechanism 1 and used to blow the inner wall of the material conveying pipe 11. By setting the blowing mechanism 4, residual materials that are firmly adhered to the inner wall of the material conveying pipe 11 can be blown up, and then the dust extraction mechanism 3 can remove these blown-up materials, thereby further ensuring the cleanliness of the inner wall of the material conveying pipe 11. It should be noted that since the blowing mechanism 4 is mainly used to blow up residual materials that are firmly adhered to the inner wall of the material conveying pipe 11, the air outlet of the blowing mechanism 4 is generally set to be small. The small air outlet can easily form a high-pressure impact airflow, thereby cleaning the inner wall of the material conveying pipe 11. However, the flow rate of this high-pressure impact airflow is limited, and the gas provided by the blowing mechanism 4 alone is difficult to meet the discharge requirements of the dust extraction mechanism 3. To avoid the dust extraction mechanism 3 from being unable to suck up the gas, an air inlet mechanism 2 is required to prevent the negative pressure in the material conveying pipe 11 from being too large.

[0037] like Figure 2 and Figure 3 As shown, taking one structure of the purging mechanism 4 as an example, in an embodiment of the present invention, the material conveying pipe 11 has an outwardly protruding mounting seat 115 on its pipe wall. A purging channel 116 communicating with the pipe cavity is formed within the mounting seat 115. The purging mechanism 4 consists of an air nozzle 41 and a high-pressure air source. One end of the air nozzle 41 extends into the purging channel 116 and is connected to the mounting seat 115, while the other end is connected to the high-pressure air source. The air nozzle 41 can be threaded into the purging channel 116 and can be controlled by a solenoid valve. The solenoid valve controls the air nozzle 41 to purge the inner wall of the spiral conveying pipe section 114. It should be noted that there are multiple air nozzles 41, spaced apart along the length of the material conveying pipe 11. The solenoid valve can control the air nozzles 41 at different positions to blow air, thereby forming an intermittent jet of impact airflow within the material conveying pipe 11 through the cooperation of different air nozzles 41.

[0038] Taking another structure of the purging mechanism 4 as an example, such as Figure 4 and Figure 5 As shown, the screw conveyor shaft 14 is a hollow pipe. The purging mechanism 4 includes an air-assisted nozzle 42 mounted on the screw conveyor shaft 14. The air-assisted nozzle 42 connects the cavity of the material conveying pipe 11 and the hollow cavity 141 of the screw conveyor shaft 14. The purging mechanism 4 also includes an air-injecting component for injecting air into the hollow cavity 141 of the screw conveyor shaft 14. The air-injecting component can be a high-pressure air source, or it can be a blower or fan blade 43. Taking the fan blade 43 as an example... Figure 4As shown, an air injection channel 142 is provided at the end of the screw conveyor shaft 14. A fan blade 43 is provided at the outer end of the air injection channel 142, and the fan blade 43 is coaxially connected to the screw conveyor shaft 14. When the drive motor 15 drives the screw conveyor shaft 14 to rotate, the fan blade 43 will also rotate together and generate airflow. The airflow will enter the hollow cavity 141 of the screw conveyor shaft 14 through the air injection channel 142, and then be sprayed out from the air-assisted nozzle 42, thereby blowing the inner wall of the material conveying pipe 11. Since the air-assisted nozzle 42 is set on the screw conveyor shaft 14, it can rotate together with the screw conveyor shaft 14, thereby circumferentially blowing the inner wall of the material conveying pipe 11. At the same time, a filter screen can be set on the air-assisted nozzle 42 to prevent dust from entering the hollow cavity 141 of the screw conveyor shaft 14.

[0039] like Figure 1 As shown, in an embodiment of the present invention, the material conveying pipeline 11 includes a chute section 113 and a spiral conveying section 114. The end of the chute section 113 away from the spiral conveying section 114 is the feed end 111, and the end of the spiral conveying section 114 away from the chute section 113 is the discharge end 112. An air inlet mechanism 2 is located near the feed end 111 and is disposed on the chute section 113 or on the spiral conveying section 114. A dust extraction mechanism 3 is located near the discharge end 112 and is disposed on the spiral conveying section 114 or on the sealed hopper 12. By positioning the air inlet mechanism 2 near the feed end 111 and the dust extraction mechanism 3 near the discharge end 112, airflow can be directed from the feed end 111 to the discharge end 112, thereby cleaning the entire material conveying pipeline 11. Preferably, the air inlet mechanism 2 is located on the non-material flow impact side of the chute section 113 to prevent material from clogging the air inlet mechanism 2. The dust extraction mechanism 3 is located near the discharge end 112 on the sealed silo 12. Thus, the dust extraction mechanism 3 can not only extract dust from the material conveying pipe 11 during material conveying, but also extract dust from the sealed silo 12, thereby reducing the density of dust in the material conveying mechanism 1 during material conveying and preventing dust from overflowing from the discharge port of the sealed silo 12. Of course, the positions of the air inlet mechanism 2 and the dust extraction mechanism 3 can also be reversed, such as the dust extraction mechanism 3 being located near the inlet end 111 and the air inlet mechanism 2 being located near the discharge end 112.

[0040] like Figure 1 As shown, in an embodiment of the present invention, the air intake mechanism 2 is disposed on the chute section 113 and may be an air intake pipe 21 and an air intake valve 22. One end of the air intake pipe 21 is connected to the chute section 113, and the other end is provided with the air intake valve 22. The air intake pipe 21 may be welded to the chute section 113 and has an air intake channel forming inside that connects to the cavity of the chute section 113. The air intake valve 22 may close the air intake channel, thereby realizing the on / off control of the air intake mechanism 2. The other end of the air intake valve 22 may be connected to the outside or to other air sources.

[0041] like Figure 1As shown, in an embodiment of the present invention, a dust extraction mechanism 3 is disposed on the sealed silo 12 and includes a dust extraction pipe 31 and a vacuum cleaner. One end of the dust extraction pipe 31 is connected to the sealed silo 12, and the other end is connected to the vacuum cleaner. Specifically, the discharge end 112 of the material conveying pipe 11 is connected to the top wall of the sealed silo 12, and the dust extraction pipe 31 is also disposed on the top wall of the sealed silo 12. Since dust generally spreads upward, the dust extraction mechanism 3 is disposed on the top wall of the sealed silo 12 to more easily remove this dust.

[0042] like Figure 1 and Figure 3 As shown, in an embodiment of the present invention, the material conveying mechanism 1 further includes a spiral conveying shaft 14 and a drive motor 15. The spiral conveying shaft 14 is disposed within the spiral conveying pipe section 114, and the output end of the drive motor 15 is connected to the spiral conveying shaft 14. The spiral conveying shaft 14 is provided with multiple spiral conveying blades. The drive motor 15 drives the spiral conveying shaft 14 to rotate, thereby realizing the conveying of materials.

[0043] In an embodiment of the present invention, the screw conveyor further includes a vibrating motor, which is installed on the outer wall of the sealed hopper 12. Residual materials that are firmly adhered to the inner wall of the material conveying pipe 11 can be blown away by the blowing mechanism 4, while residual materials that are firmly adhered to the inner wall of the sealed hopper 12 can be shaken off by the vibrating motor. Through the blowing mechanism 4 and the vibrating motor, the cleanliness of the entire material conveying mechanism 1 is ensured.

[0044] like Figure 1 As shown in the embodiment of the present invention, the bottom of the sealed silo 12 is also provided with a discharge port, and a discharge valve 121 for opening and closing is provided on the discharge port. The discharge valve 121 can open and close the sealed silo 12, and the discharge port is used to connect to the container. After the material enters the sealed silo 12, the container is connected to the discharge port of the sealed silo 12, and then the discharge valve 121 is opened, at which time the material can flow into the container.

[0045] like Figure 6 As shown, to achieve the above objectives, the present invention also provides a cleaning method for a screw conveyor device, wherein the cleaning method for the screw conveyor device can be applied to the screw conveyor device described above, and the cleaning method for the screw conveyor device includes:

[0046] S10: Close the material distribution valve 13, seal the material hopper 12 and the air inlet mechanism 2 to make the material conveying pipeline 11 a closed pipeline;

[0047] S20: Open the dust extraction mechanism 3 to create negative pressure in the cavity of the material conveying pipe 11;

[0048] S30: Open the air intake mechanism 2 and increase the power of the dust extraction mechanism 3;

[0049] S40: Close the dust extraction mechanism 3 and the air intake mechanism 2 to complete the cleaning.

[0050] The cleaning method described above will be explained in detail below with reference to the specific structure of the screw conveyor. It should be noted that the screw conveyor includes, for example, the following components. Figure 1 The material conveying mechanism 1, air inlet mechanism 2, dust extraction mechanism 3, and purging mechanism 4 are shown. Specifically, as... Figure 7 As shown, the cleaning method specifically includes:

[0051] S110: Close the material distribution valve 13, the discharge valve 121 and the air inlet valve 22 to make the material conveying pipeline 11 a closed pipeline;

[0052] S210: Turn on the vacuum cleaner to create negative pressure in the cavity of the material conveying pipe 11, start the drive motor 15 to rotate the spiral conveying shaft 14, start the blowing mechanism 4, and blow the air nozzle 41 to blow the inner wall of the material conveying pipe 11.

[0053] S310: Open the air inlet valve 22, increase the power of the dust extraction mechanism 3, and turn on the vibration motor;

[0054] S410: After running for the preset time, turn off the drive motor 15, the blowing mechanism 4, the vibration motor, the air inlet valve 22 and the vacuum cleaner, and open the discharge valve 121 to discharge the dust deposited during cleaning from the discharge port, thus completing the cleaning.

[0055] In steps S110 to S310, the purpose of first closing the air inlet mechanism 2 and then opening the air inlet mechanism 2 after a negative pressure is formed in the cavity of the material conveying pipeline 11 is that the negative pressure can ensure that the dust in the cavity will not escape from the air inlet mechanism 2 when the air inlet mechanism 2 is opened.

[0056] The purpose of turning on the drive motor 15 in step S210 is that when the blowing mechanism 4 blows the inner wall of the material conveying pipe 11, it will not only generate dust, but also blow off the heavier residual material. By starting the drive motor 15, the residual material can be conveyed into the sealed hopper 12.

[0057] In summary, the spiral conveyor device of the present invention can not only achieve zero dust during material conveying, but also, by setting up the material conveying mechanism 1, the air inlet mechanism 2, the dust extraction mechanism 3, and the blowing mechanism 4, the interior of this sealed spiral conveyor device can be cleaned very easily, and the cleaning process can also achieve zero dust, and the degree of cleaning can be guaranteed by the blowing mechanism 4 and the vibration motor.

[0058] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A screw conveyor device, characterized in that, The screw conveyor includes: The material conveying mechanism (1) includes a material conveying pipe (11) and a sealed silo (12). The material conveying pipe (11) has a material distribution valve (13) at its inlet end (111) and a material outlet end (112) connected to the sealed silo (12). The air inlet mechanism (2) is openably and closably connected to the cavity of the material conveying pipeline (11); A dust extraction mechanism (3) is used to extract the material conveying pipe (11); When the material distribution valve (13), the sealed hopper (12), and the air inlet mechanism (2) are closed, the material conveying pipeline (11) is a closed pipeline. The screw conveyor also includes a screw conveyor shaft (14) and a purging mechanism (4), which is disposed on the material conveying mechanism (1) and used to purge the inner wall of the material conveying pipe (11); The spiral conveying shaft (14) is a hollow pipe, and an air injection channel (142) is provided at the end of the spiral conveying shaft (14). The purging mechanism (4) includes an air-assisted nozzle (42) provided on the spiral conveying shaft (14). The air-assisted nozzle (42) connects the cavity of the material conveying pipe (11) and the hollow cavity (141) of the spiral conveying shaft (14). The purging mechanism (4) also includes a fan blade (43) coaxially connected to the spiral conveying shaft (14). The material conveying pipeline (11) includes a chute section (113) and a spiral conveying section (114). The end of the chute section (113) away from the spiral conveying section (114) is the feed end (111), and the end of the spiral conveying section (114) away from the chute section (113) is the discharge end (112). The air inlet mechanism (2) is located near the feed end (111) and is located on the chute section (113) or on the spiral conveying section (114). The dust extraction mechanism (3) is located near the discharge end (112) and is located on the spiral conveying section (114) or on the sealed silo (12).

2. The screw conveyor according to claim 1, characterized in that, The air intake mechanism (2) is installed on the chute section (113) and includes an air intake pipe (21) and an air intake valve (22). One end of the air intake pipe (21) is connected to the chute section (113), and the other end is provided with the air intake valve (22).

3. The screw conveyor according to claim 1, characterized in that, The dust extraction mechanism (3) is installed on the sealed hopper (12) and includes a dust extraction pipe (31) and a vacuum cleaner. One end of the dust extraction pipe (31) is connected to the sealed hopper (12), and the other end is connected to the vacuum cleaner.

4. The screw conveyor according to claim 1, characterized in that, The material conveying mechanism (1) further includes a spiral conveying shaft (14) and a drive motor (15). The spiral conveying shaft (14) is disposed in the spiral conveying pipe section (114), and the output end of the drive motor (15) is connected to the spiral conveying shaft (14).

5. The screw conveyor according to any one of claims 1 to 4, characterized in that, The screw conveyor also includes a vibrating motor, which is mounted on the outer wall of the sealed hopper (12).

6. The screw conveyor according to any one of claims 1 to 4, characterized in that, The bottom of the sealed hopper (12) is also provided with a discharge port, and the discharge port is provided with a discharge valve (121) for opening and closing.

7. A cleaning method for a screw conveyor device, characterized in that, Applied to the screw conveyor according to any one of claims 1 to 6, wherein the cleaning method of the screw conveyor includes: Close the material distribution valve (13), seal the hopper (12) and the air inlet mechanism (2) to make the material conveying pipeline (11) a closed pipeline; Turn on the dust extraction mechanism (3) to create a negative pressure in the cavity of the material conveying pipe (11); turn on the air inlet mechanism (2) and increase the power of the dust extraction mechanism (3); Turn off the dust extraction mechanism (3) and the air intake mechanism (2) to complete the cleaning.

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