A pneumatic conveying device

Abstract

This utility model relates to the field of urea production technology, specifically a pneumatic conveying device, including a Roots blower, a support platform, and a frame cylinder connected to the air outlet of the Roots blower. A rotary valve is installed on the frame cylinder, and a storage component connected to the rotary valve is installed on the support platform. Before starting the Roots blower, the air filtration component is adjusted according to the ambient humidity. If the relative humidity is high, the heating rod inside the rectangular tube is turned on to heat the incoming air to a suitable temperature, initially removing some moisture. The air then enters the double-cone chamber through the pipe body, first passing through a mesh plate to filter out large particles of impurities, and then flowing through a dehumidifier box between the side strips and the convex strips. The remaining moisture is absorbed by a desiccant, ultimately resulting in clean, dry air. Simultaneously, rotating the ball valve connects the upper pipe section to the air inlet pipe, allowing the dehumidifier box to be replaced without stopping production.

Description

Technical Field

[0001] This utility model relates to the field of urea production technology, specifically to a pneumatic conveying device. Background Technology

[0002] In the production of compound fertilizer, urea is a key raw material, and its transportation is crucial. Due to its advantages such as high efficiency and environmental friendliness, pneumatic conveying technology has been widely used in the field of urea transportation. However, in the actual process of pneumatic conveying of urea, many challenges are faced.

[0003] On the one hand, the air drawn into the conveying system often contains a large number of impurities, such as dust and particulate matter. If these impurities directly enter the conveying pipeline, they will not only cause wear to the inner wall of the pipeline and shorten its service life, but may also react with urea, affecting the quality of urea. Moreover, the accumulation of impurities may also lead to pipeline blockage, seriously affecting the continuity and stability of production. On the other hand, urea is hygroscopic and is prone to caking in humid environments, affecting its flowability and conveying effect. When the conveying air contains a lot of moisture, it will aggravate the hygroscopic phenomenon of urea, making the caking problem more prominent. Caking urea will not only reduce the conveying efficiency, but may also form blockages in the pipeline, increasing cleaning costs and downtime. Utility Model Content

[0004] Based on the above description, this utility model provides a pneumatic conveying device that solves the technical problems pointed out in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic conveying device, comprising a Roots blower, a support platform, and a frame cylinder connected to the air outlet of the Roots blower. A star-shaped unloader is installed on the frame cylinder, and a storage component connected to the star-shaped unloader is installed on the support platform. An air filter component for purifying the incoming air is installed at the air inlet of the Roots blower. The air filter component includes a double-cone chamber. A mesh plate for preliminary filtration of impurities is fixed on the inner side of the double-cone chamber near its own air inlet. Side strips located below the mesh plate are fixed on both the left and right side walls of the double-cone chamber. A protruding strip is also fixed on the inner side of the double-cone chamber between the two side strips. A receiving space for placing a dehumidification box is formed between the side strips and the protruding strip. A duct connected to the air inlet of the Roots blower is fixed at the bottom of the double-cone chamber.

[0006] Furthermore, the conduit is divided into an upper section and a lower section, and a ball valve for controlling the airflow is installed between the upper section and the lower section. The other end of the ball valve is fixed with an air inlet pipe that is connected to the air inlet of the Roots blower.

[0007] Furthermore, a pipe is fixed at the air inlet of the double cone chamber, and a rectangular tube is fixed at the end of the pipe away from the double cone chamber. Multiple electric heating rods for preheating and dehumidification are installed on the inner side of the rectangular tube.

[0008] Furthermore, the storage assembly includes an annular seat fixed on the support platform, and a bin connected to the star-shaped unloader is mounted on the annular seat via an elastic component. Multiple vibration components for preventing material agglomeration and blockage are evenly installed on the outer side of the bin in the circumferential direction.

[0009] Furthermore, the vibration component is a vibration motor.

[0010] Furthermore, the elastic component includes an annular plate and multiple protrusions. The annular plate is integrally formed on the outer side of the chamber body and is disposed opposite to the annular seat. Multiple protrusions are correspondingly formed on the side of the annular seat opposite to the annular plate, and a spring is fixed between two protrusions that are positioned opposite each other.

[0011] Furthermore, the top of the compartment is equipped with two sets of observation windows.

[0012] Furthermore, the top of the chamber is conical, and the top of the conical structure arches upward to form a slope, with the two sets of observation windows respectively embedded on the inclined surface of the slope.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects: This pneumatic conveying device adjusts the air filtration components according to the ambient humidity before starting the Roots blower. If the relative humidity is high, the electric heating rod inside the rectangular tube is turned on to heat the incoming air to a suitable temperature, initially removing some moisture. The air then enters the double cone chamber through the pipe body, first passing through the mesh plate to filter out large particles of impurities, and then flowing through the dehumidification box between the side strips and the convex strips. The remaining moisture is absorbed by the desiccant, ultimately resulting in clean and dry air. At the same time, turning the ball valve connects the upper pipe section to the air inlet pipe, allowing the dehumidification box to be replaced without stopping the operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional bottom view of the support platform connection structure in this utility model; Figure 3 This is a three-dimensional cross-sectional view of the air filter assembly in this utility model (right view). Figure 4 This is a three-dimensional cross-sectional top view of the double-cone chamber in this utility model.

[0015] In the diagram: 1. Roots blower; 2. Air filter assembly; 21. Inlet pipe; 22. Ball valve; 23. Conduit; 25. Double cone chamber; 26. Pipe body; 27. Rectangular tube; 28. Heating rod; 29. ​​Mesh plate; 210. Edge strip; 211. Raised strip; 3. Frame cylinder; 4. Rotary rotary valve; 5. Support platform; 6. Storage assembly; 61. Annular seat; 62. Chamber body; 63. Vibration motor; 64. Spring; 65. Raised column. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4 This embodiment of a pneumatic conveying device includes a Roots blower 1 and a frame cylinder 3 connected to the air outlet of the Roots blower 1, and a support platform 5 mounted above the frame cylinder 3. A star-shaped unloader 4 is installed on the top of the frame cylinder 3 to control the unloading rate of urea, ensuring that urea enters the frame cylinder 3 evenly. A storage component 6 connected to the star-shaped unloader 4 is installed on the top of the support platform 5. The storage component 6 is used to provide urea to the star-shaped unloader 4 to achieve temporary storage. An air filter component 2 is installed at the air inlet of the Roots blower 1 to treat impurities and moisture in the air.

[0018] like Figure 3-4 This system effectively removes impurities and moisture from the air. The air filter assembly 2 includes a double-cone chamber 25 and is connected to the air inlet of the Roots blower 1 via a duct 23. A lockable door is installed on the front of the double-cone chamber 25. A mesh plate 29 is fixed to the inner side of the double-cone chamber 25 near the air inlet, which can initially filter large particulate impurities in the air, such as dust or debris, preventing impurities from directly entering the subsequent dehumidification structure and mixing into the urea. Side strips 210 are fixed to the left and right side walls of the double-cone chamber 25 below the mesh plate 29, with the inner side located within the side strips 210. A protruding strip 211 is fixed in the middle. The left and right sides of the protruding strip 211 and the side strip 210 are on the same horizontal plane. Two sets of receiving spaces are formed between the side strip 210 and the protruding strip 211. A dehumidifying box can be stably placed in the receiving space. The dehumidifying box includes a hollow frame. A shelf is fixed inside the frame. Silica gel desiccant is placed on the shelf. It removes moisture from the air through physical adsorption and prevents urea from absorbing moisture. The dehumidifying box is periodically maintained and the silica gel desiccant is replaced to ensure dehumidification performance.

[0019] To improve the moisture-proof effect, the air inlet of the double cone chamber 25 is fixed with a pipe body 26, and the other end of the pipe body 26 is fixedly connected with a rectangular tube 27. Multiple electric heating rods 28 are installed inside the rectangular tube 27. In a high humidity environment, the electric heating rods 28 heat the inside of the rectangular tube 27 to 30-40℃, which can heat and dehumidify the incoming air and further reduce the air humidity.

[0020] Additionally, when the dehumidifier box needs to be replaced, the duct 23 is divided into an upper section and a lower section. The lower section is connected to the double cone chamber 25. A ball valve 22 is installed between the upper and lower sections of the duct 23. The left end of the ball valve 22 is connected to the Roots blower 1 through the air inlet pipe 21. The ball valve 22 can switch the airflow. The ball valve 22 has an L-shaped flow channel. When it is necessary to clean the double cone chamber 25 or replace the dehumidifier box, the ball valve 22 can be rotated to connect the upper section with the air inlet pipe 21, thereby cutting off the connection with the double cone chamber 25. Air enters through the upper pipe section to continue delivering urea. At the same time, it can also be used to clean the inside of the double cone chamber 25 or replace the dehumidifier box without stopping the machine. It is understandable that when the upper pipe section of the conduit 23 is used for ventilation temporarily, although this does not dehumidify, the temporary ventilation will not have an adverse effect. Of course, if it is necessary to avoid the impact, a corresponding dehumidification structure can be designed in the upper pipe section of the conduit 23. The dehumidification structure can be the same as the dehumidification structure used in the lower pipe section of the conduit 23.

[0021] like Figure 2 To minimize the risk of urea caking and blockage, the storage assembly 6 includes an annular seat 61 fixed on the support platform 5. A hopper 62 is mounted on the top of the annular seat 61 via an elastic component. At least two sets of vibration motors 63 are mounted on the outside of the hopper 62. The operation of the vibration motors 63 breaks the adhesion between urea particles, preventing caking. The discharge port of the hopper 62 is connected to the star-shaped unloader 4. The hopper 62 is used for temporary storage of urea. The elastic component includes an annular plate formed on the outside of the hopper 62. The annular plate is distributed opposite to the annular seat 61. Protrusions 65 are formed on the opposite sides of the annular seat 61 and the annular plate. Springs 64 are fixed between the opposite protrusions 65. The springs 64 can buffer the impact force when the hopper 62 vibrates, while also enhancing the vibration transmission effect.

[0022] The top of the silo 62 is conical, and the top of the conical structure arches upward to form a slope. Two sets of observation windows are respectively embedded on the inclined surface of the slope, which makes it convenient for operators to observe the urea material level and caking in the silo in real time and make timely adjustments.

[0023] The working principle of the above embodiments is as follows: After the Roots blower 1 starts as the power source, outside air first enters the air filter assembly 2 for impurity and moisture treatment. The air first enters the double cone chamber 25, where the inner mesh plate 29 initially filters large particles of impurities, such as dust or debris, preventing them from entering the subsequent dehumidification structure and mixing with the urea. The filtered air continues to flow downwards, passing through the dehumidification box placed on the side strips 210 and the convex strips 211, where physical adsorption removes moisture from the air, preventing the urea from absorbing moisture. In high humidity environments, the electric heating rod 28 in the rectangular tube 27 is activated, heating the rectangular tube 27 to 30-40℃, further reducing the humidity of the incoming air and improving the moisture-proof effect. The pre-treated air is then transported to the Roots blower 1 through the duct 23, and then enters the frame cylinder 3. The star-shaped unloader 4 evenly distributes the air into the chamber 62. The urea is discharged downwards and transported in conjunction with the Roots blower 1. When it is necessary to clean the double cone silo 25 or replace the dehumidifier box, the ball valve 22 between the upper and lower pipe sections of the guide tube 23 can be rotated to connect the upper pipe section with the air inlet pipe 21 connected to the Roots blower 1, cutting off the connection with the double cone silo 25. Air can still enter through the upper pipe section to continue transporting urea, achieving non-stop operation. To prevent urea from clumping and clogging, the vibration motor 63 of the silo body 62 is activated to break the adhesion between urea particles. The spring 64 between the outer ring plate of the silo body 62 and the protrusion 65 on the opposite side of the ring seat 61 can buffer the impact force when the silo body 62 vibrates, while enhancing the vibration transmission effect. In addition, the top of the silo body 62 is conical and arched to form a slope. Through the observation window on the slope, it is convenient for the operator to observe the urea level and clumping in the silo in real time and make timely adjustments.

[0024] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0025] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic conveying device, comprising a Roots blower (1), a support platform (5), and a frame cylinder (3) connected to the outlet of the Roots blower (1), wherein a rotary valve (4) is installed on the frame cylinder (3), and a storage assembly (6) connected to the rotary valve (4) is installed on the support platform (5), characterized in that: The Roots blower (1) is equipped with an air filter assembly (2) for purifying the incoming air at the air inlet. The air filter assembly (2) includes a double cone chamber (25). A mesh plate (29) for preliminary filtration of impurities is fixed on the inner side of the double cone chamber (25) near its own air inlet. Side strips (210) located below the mesh plate (29) are fixed on both the left and right side walls of the double cone chamber (25). A protruding strip (211) is also fixed on the inner side of the double cone chamber (25) between the two side strips (210). The side strips (210) and the protruding strips (211) form a space for holding the dehumidification box. A duct (23) connected to the air inlet of the Roots blower (1) is fixed at the bottom of the double cone chamber (25).

2. The pneumatic conveying device according to claim 1, characterized in that: The conduit (23) is divided into an upper section and a lower section, and a ball valve (22) for controlling the air flow is installed between the upper section and the lower section. The other end of the ball valve (22) is fixed with an air inlet pipe (21) that is connected to the air inlet of the Roots blower (1).

3. The pneumatic conveying device according to claim 1, characterized in that: A tube (26) is fixed at the air inlet of the double cone chamber (25). A rectangular tube (27) is fixed at the end of the tube (26) away from the double cone chamber (25). Multiple electric heating rods (28) for preheating and dehumidification are installed on the inner side of the rectangular tube (27).

4. The pneumatic conveying device according to claim 1, characterized in that: The storage assembly (6) includes an annular seat (61) fixed on the support platform (5). A bin (62) connected to the star-shaped unloader (4) is installed on the annular seat (61) via an elastic component. Multiple vibration components for preventing material agglomeration and blockage are evenly installed on the outer side of the bin (62) along the circumferential direction.

5. A pneumatic conveying device according to claim 4, characterized in that: The vibration component is a vibration motor (63).

6. A pneumatic conveying device according to claim 5, characterized in that: The elastic component includes an annular plate and a plurality of protrusions (65). The annular plate is integrally formed on the outside of the chamber (62) and is disposed opposite to the annular seat (61). The annular seat (61) is provided with a plurality of protrusions (65) on the side opposite to the annular plate. A spring (64) is fixed between two protrusions (65) that are in opposite positions.

7. A pneumatic conveying device according to claim 6, characterized in that: The top of the compartment (62) is provided with two sets of observation windows.

8. A pneumatic conveying device according to claim 7, characterized in that: The top of the chamber (62) is conical, and the top of the conical structure arches upward to form a slope. The two sets of observation windows are respectively embedded on the inclined surface of the slope.

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