Dry powder feeding device for kettle

Abstract

The dry powder feeding device comprises a feeding pipe, a conveying pipeline, a spiral stirring rod and a driving unit, the spiral stirring rod is arranged in the conveying pipeline in a penetrating mode, the rear end of the spiral stirring rod is in transmission connection with the driving unit, the lower end of the feeding pipe is communicated with the conveying pipeline, and the communication position is close to the rear end of the conveying pipeline. A sealing unit is arranged between the rear end of the conveying pipeline and the driving unit, the sealing unit is used for sealing the rear end of the conveying pipeline, and the front end of the spiral stirring rod extends to the outer side of the conveying pipeline. The utility model solves the problems of non-uniform conveying, easy blockage and insufficient sealing performance in the dry powder conveying process.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical industry mechanical equipment, in particular to a dry powder feeding device for a kettle. Background Art

[0002] In the production and processing of chemical, pharmaceutical, food and other industries, it is often necessary to transport dry powder raw materials to the reactor for reaction. However, the existing dry powder conveying devices often have the following problems during the conveying process: uneven conveying, difficult to accurately control the conveying amount, which easily leads to uneven distribution of raw materials in the reactor, affecting the reaction effect; dry powder is easy to adhere to the wall during pipeline transportation, affecting the cleaning effect; it is easy to get blocked, affecting production efficiency; insufficient sealing may cause dry powder leakage, causing environmental pollution and waste of raw materials. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a dry powder feeding device for a kettle in view of the deficiencies in the above-mentioned prior art, so as to solve the problems of uneven conveying, easy clogging and insufficient sealing in dry powder conveying.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a dry powder feeding device for a kettle, comprising a feeding pipe, a conveying pipeline, a spiral stirring rod and a driving unit, the spiral stirring rod is inserted into the conveying pipeline and the rear end of the spiral stirring rod is transmission-connected to the driving unit, the lower end of the feeding pipe is connected to the conveying pipeline and the connection point is close to the rear end of the conveying pipeline, a sealing unit is arranged between the rear end of the conveying pipeline and the driving unit, the sealing unit is used to seal the rear end of the conveying pipeline, and the front end of the spiral stirring rod extends to the outside of the conveying pipeline.

[0005] The above-mentioned dry powder feeding device for kettle, the angle of the spiral structure of the spiral stirring rod is 60° tooth angle.

[0006] The above-mentioned dry powder feeding device for the kettle has an angle of 45° between the feed pipe and the conveying pipe.

[0007] The above-mentioned dry powder feeding device for kettle, the driving unit includes a motor, a reducer and a coupling, the motor and the reducer are transmission connected, and the reducer is connected to the rear end of the spiral stirring rod through the coupling.

[0008] The above-mentioned dry powder feeding device for the kettle, the sealing unit includes a cartridge mechanical seal assembly and a motor base. The cartridge mechanical seal assembly is of a hollow structure. The front end of the cartridge mechanical seal assembly is connected to the rear end of the conveying pipeline, and the rear end of the cartridge mechanical seal assembly is connected to the motor base. A bearing assembly is arranged at the position of the rear end inside the cartridge mechanical seal assembly. The bearing assembly supports the smooth rod section of the spiral stirring rod. The spiral stirring rod has a shoulder structure at the position close to the rear end of the conveying pipeline. The section of the spiral stirring rod behind the shoulder structure is a smooth rod structure. The shoulder structure is supported between the inner walls of the conveying pipeline. A first sealing ring is connected at the joint of the cartridge mechanical seal assembly and the conveying pipeline. The first sealing ring is sleeved on the smooth rod section.

[0009] In the above-mentioned dry powder feeding device for the kettle, a retaining ring is arranged on the front side of the bearing assembly. A second sealing ring is connected to the front side of the retaining ring. The second sealing ring is sleeved on the smooth rod section.

[0010] In the above-mentioned dry powder feeding device for the kettle, a phenolic cloth wear-resistant support ring is sleeved on the shoulder structure.

[0011] In the above-mentioned dry powder feeding device for the kettle, the upper end of the feed pipe is used to connect to a storage bin.

[0012] The present utility model has the following advantages compared with the prior art:

[0013] 1. By setting the spiral stirring rod, the present invention effectively prevents caking and blockage of dry powder during transportation, ensures the smoothness of transportation. The design that the spiral stirring rod extends out of the conveying pipeline makes there be no residue in the conveying pipeline, reducing raw material waste.

[0014] 2. By setting the sealing unit, the present invention improves the sealing performance of the device, avoids dry powder leakage, and reduces environmental pollution and raw material waste.

[0015] 3. By controlling the flow rate through the pitch of the spiral stirring rod and the motor speed, the present invention can accurately control the conveying amount of dry powder, meet the requirements of different reaction processes, and improve production efficiency and product quality.

[0016] Next, through the drawings and embodiments, the technical solutions of the present utility model will be further described in detail. Brief Description of the Drawings

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model.

[0018] Figure 2 It is a schematic cross-sectional view of the internal structure of the present utility model.

[0019] Figure 3 It is a usage state diagram of the present utility model.

[0020] Description of the reference numerals:

[0021] 1 - Feed pipe; 2 - Conveying pipeline; 3 - Screw stirring rod;

[0022] 4 - Motor; 5 - Reducer; 6 - Coupling;

[0023] 7 - Integrated mechanical seal assembly; 8 - Motor base; 9 - Bearing assembly;

[0024] 10 - Shoulder structure; 11 - First sealing ring; 12 - Retaining ring;

[0025] 13 - Second sealing ring; 14 - Phenolic cloth wear-resistant support ring; 15 - Storage bin. Detailed implementation manners

[0026] As Figure 1 — Figure 3 shown, a dry powder feeding device for a kettle includes a feed pipe 1, a conveying pipeline 2, a screw stirring rod 3 and a driving unit. The screw stirring rod 3 is arranged in the conveying pipeline 2 and the rear end of the screw stirring rod 3 is drivingly connected to the driving unit. The lower end of the feed pipe 1 communicates with the conveying pipeline 2 and the communicating part is close to the rear end of the conveying pipeline 2. A sealing unit is arranged between the rear end of the conveying pipeline 2 and the driving unit, and the sealing unit is used for sealing the rear end of the conveying pipeline 2. The front end of the screw stirring rod 3 extends out of the conveying pipeline 2.

[0027] In this embodiment, the angle of the screw structure of the screw stirring rod 3 is 60° thread angle.

[0028] In this embodiment, the included angle between the feed pipe 1 and the conveying pipeline 2 is 45° included angle.

[0029] In this embodiment, the driving unit includes a motor 4, a reducer 5 and a coupling 6. The motor 4 and the reducer 5 are drivingly connected, and the reducer 5 is connected to the rear end of the screw stirring rod 3 through the coupling 6.

[0030] In this embodiment, the sealing unit includes a canned mechanical seal assembly 7 and a motor base 8. The canned mechanical seal assembly 7 is of a hollow structure. The front end of the canned mechanical seal assembly 7 is connected to the rear end of the conveying pipeline 2, and the rear end of the canned mechanical seal assembly 7 is connected to the motor base 8. A bearing assembly 9 is provided at the position of the rear end inside the canned mechanical seal assembly 7. The bearing assembly 9 supports the smooth rod section of the screw stirring rod 3. The screw stirring rod 3 has a shoulder structure 10 at a position close to the rear end of the conveying pipeline 2. The section of the screw stirring rod 3 behind the shoulder structure 10 is of a smooth rod structure. The shoulder structure 10 is supported between the inner walls of the conveying pipeline 2. A first sealing ring 11 is connected at the joint of the canned mechanical seal assembly 7 and the conveying pipeline 2. The first sealing ring 11 is sleeved on the smooth rod section.

[0031] In this embodiment, a retaining ring 12 is provided on the front side of the bearing assembly 9. A second sealing ring 13 is connected to the front side of the retaining ring 12. The second sealing ring 13 is sleeved on the smooth rod section.

[0032] In this embodiment, a phenolic cloth wear-resistant support ring 14 is sleeved on the shoulder structure 10.

[0033] In this embodiment, the upper end of the feed pipe 1 is used to connect to a storage bin 15.

[0034] During actual implementation, the storage bin 15 is used to store dry powder raw materials. It is provided with a discharge port at the bottom, and the arc design at the bottom can eliminate dead zones.

[0035] The conveying pipeline 2 is connected to the discharge port of the storage bin 15. A screw stirring rod 3 is used to replace a traditional conveying pump to push the dry powder to move in the pipeline.

[0036] The screw stirring rod 3 is arranged inside the conveying pipeline 2 and is used to stir the dry powder to prevent the dry powder from caking and blocking, and at the same time plays a key role as a screw conveying mechanism. The dry powder falls from the solid material bin into the conveying pipeline 2 by gravity. The screw stirring rod 3 pushes the dry powder from the conveying pipeline 2 into the reaction kettle. The screw stirring rod 3 is integrally turned by a CNC lathe, and the helix angle is 60° tooth profile angle. In addition, the screw stirring rod 3 extends into the kettle, and the screw stirring rod 3 extends out of the conveying pipeline 2 into the kettle so that there is no residue in the pipeline.

[0037] The dry powder is prone to caking under the influence of various factors during the conveying process. Caking will reduce the effective flow area of the pipeline or even block the pipeline, affecting production. The screw stirring rod 3 continuously rotates to break the caking structure between the dry powder particles, keep the dry powder loose, and ensure smooth conveying.

[0038] When there is no spiral stirring rod 3, the dry powder is prone to stratification, accumulation or local concentration in the pipeline, resulting in uneven distribution of the dry powder transported to the reaction kettle and affecting the reaction quality. The spiral stirring rod 3 makes the dry powder continuously mix and turn in the pipeline, ensuring uniform transportation and improving the reaction stability.

[0039] The uneven flow or caking of the dry powder will cause irregular friction and collision with the inner wall of the pipeline, increasing the pipeline wear. The spiral stirring rod 3 makes the dry powder flow evenly, reducing the local impact force and friction of the dry powder on the inner wall of the pipeline, reducing the pipeline wear rate and extending the service life.

[0040] By promoting the uniform flow of the dry powder and preventing blockage, the transportation resistance and stagnation phenomenon are reduced, enabling the dry powder to move more smoothly in the pipeline, improving the transportation efficiency and reducing the energy consumption.

[0041] The shape, size and installation method of the spiral stirring rod 3 need to be adapted to the inner diameter, shape and layout of the conveying pipeline 2. For the circular conveying pipeline 2, the rotating part of the spiral stirring rod 3 should be able to rotate freely without interfering with the inner wall of the pipeline and have a very small gap with the conveying pipeline 2; for pipelines with different lengths and bending degrees, it is necessary to ensure effective stirring and pushing of the dry powder throughout the range. At the same time, consider the firmness, sealing and convenience of the connection method.

[0042] According to the characteristics of the dry powder (particle size, density, fluidity, etc.), the conveying volume and speed requirements, reasonably design the spiral stirring intensity and the rotation speed of the motor 4. Avoid excessive spiral stirring intensity resulting in excessive dispersion of the dry powder and increased equipment wear, or too small spiral stirring intensity failing to achieve the expected effect. Precise control is achieved by selecting appropriate parameters such as the torque of the motor 4, the speed ratio of the reducer 5, and the shape and angle of the spiral stirring blades.

[0043] The spiral stirring rod 3 needs to cooperate with the stirring motor 4, sensors, etc. For example, it matches the operation of the stirring motor 4 to prevent the dry powder from accumulating or blocking due to the mismatch between the stirring speed and the conveying speed; it cooperates with the sensors to monitor the stirring effect and the conveying state in real time, realizing automatic control and fault diagnosis.

[0044] During implementation, the motor 4 selects a stepping motor 4 with large torque + a planetary reducer 5 with a large speed ratio. The stepping motor 4 can be precisely controlled, providing a large torque output at a low rotation speed and having high reliability. The planetary reducer 5 increases the torque and reduces the rotation speed through the internal gear transmission mechanism, improving the precision and stability. The combination of the two plays a synergistic effect, optimizing the equipment performance, adapting to various working conditions and improving the system reliability.

[0045] The sealing unit adopts a combination of a phenolic cloth wear-resistant support ring 14 + V-shaped seal (first sealing ring 11) + mechanical seal. The phenolic cloth wear-resistant support ring 14 provides stable support for the sealing assembly, prevents seal deformation and failure, and withstands dry powder friction and impact. The V-shaped seal fills the sealing gap through elastic deformation, adapts to axial and radial displacements, and the multi-layer structure increases reliability. The mechanical seal relies on the close fit of the dynamic ring and the static ring to prevent dry powder from leaking through the gap between the rotating shaft and the fixed components, with high precision and strong reliability. Compared with packing seals, the leakage amount is extremely small. The bearing at the rear end of the mechanical seal adopts a deep groove ball bearing, which bears the radial and axial loads of the shaft and ensures the rotation precision and stability of the shaft.

[0046] A V-shaped seal (second sealing ring 13) for connecting the bearing lubricating oil is added between the bearing and the mechanical seal to prevent lubricating oil leakage, prevent external impurities from entering, keep the lubricating oil clean, extend the service life of the bearing and the mechanical seal, simplify the maintenance work, and improve the maintenance efficiency.

[0047] The material of the part in contact with dry powder is selected as 316L material, which has good corrosion resistance, strength, wear resistance, and cleanliness. It has good tolerance to various chemical substances, chloride ions, and high-temperature corrosion, can withstand the mechanical stress during dry powder transportation, has a smooth surface and is not easy to scale, and meets the hygiene standards. And through electrolytic polishing treatment, the surface roughness is reduced, the surface gloss is enhanced, the corrosion resistance is improved, a uniform passivation film is formed, micro-defects are eliminated, the cleaning and hygiene performance is optimized, the bacteria growth is reduced, and the fatigue resistance is improved.

[0048] The storage bin 15 adopts a quick-installation clamp structure to achieve rapid installation and disassembly, save the feeding time, improve the efficiency, adapt to various feeding scenarios, and at the same time ensure the sealing performance through special sealing materials and designs, prevent leakage and pollution, and maintain the internal pressure stability of the bin. All part connections are selected with a basic shaft system fit, which improves the assembly precision, adapts to thermal expansion, and reduces the production cost. There are strict requirements for geometric tolerances and dynamic balance after detailed calculation. Geometric tolerances ensure the accurate geometric shape and relative position of parts. For example, the straightness of the stirring shaft ensures uniform and stable stirring, and the flatness and perpendicularity of the sealing surface ensure the sealing effect. Dynamic balance reduces the unbalanced centrifugal force of rotating parts, reduces equipment vibration and noise, improves the operation efficiency and service life, and both jointly improve the overall performance of the equipment.

[0049] During use, the dry powder raw material enters the conveying pipeline 2 by gravity from the storage bin 15, and the pressure gas conveying device uses gas pressure to assist the dry powder transportation. The conveying flow rate of the dry powder is accurately controlled by adjusting the speed of the motor 4 and the pitch of the screw rod. The spiral stirring rod 3 continuously stirs the dry powder during transportation to prevent caking and blockage, and at the same time pushes the dry powder from the conveying pipeline 2 to the reaction kettle. The sealing assembly ensures the sealing performance during transportation and prevents dry powder leakage.

[0050] When the conveying volume needs to be adjusted, the rotational speed of the motor 4 and the pitch of the screw rod can be changed according to the technological requirements. The sensors in the kettle transmit real-time data to the control system, and the control system automatically adjusts the rotational speed of the motor 4 and the screw rod parameters according to the preset data values and feedback signals, so as to achieve precise control of the conveying volume.

[0051] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A dry powder feeding device for a kettle, characterized in that: It includes a feed pipe, a conveying pipe, a spiral stirring rod and a driving unit. The spiral stirring rod is inserted into the conveying pipe and the rear end of the spiral stirring rod is connected to the driving unit through a transmission. The lower end of the feed pipe is connected to the conveying pipe and the connection is close to the rear end of the conveying pipe. A sealing unit is provided between the rear end of the conveying pipe and the driving unit. The sealing unit is used to seal the rear end of the conveying pipe. The front end of the spiral stirring rod extends to the outside of the conveying pipe.

2. A dry powder feeding device for a kettle according to claim 1, characterized in that: The angle of the spiral structure of the spiral stirring rod is 60°.

3. A dry powder feeding device for a kettle according to claim 1, characterized in that: The angle between the feed pipe and the conveying pipe is 45°.

4. A dry powder feeding device for a kettle according to claim 1, characterized in that: The driving unit comprises a motor, a reducer and a coupling. The motor and the reducer are connected in a transmission manner, and the reducer is connected to the rear end of the spiral stirring rod through the coupling.

5. A dry powder feeding device for a kettle according to claim 1, characterized in that: The sealing unit includes a container-type mechanical seal assembly and a motor seat. The container-type mechanical seal assembly is a hollow structure. The front end of the container-type mechanical seal assembly is connected to the rear end of the conveying pipeline, and the rear end of the container-type mechanical seal assembly is connected to the motor seat. A bearing assembly is arranged at the rear end of the container-type mechanical seal assembly. The bearing assembly supports the smooth rod segment of the spiral stirring rod. The spiral stirring rod has a shoulder structure at a position close to the rear end of the conveying pipeline. The rear side segment of the spiral stirring rod at the shoulder structure is a smooth rod structure. The shoulder structure is supported between the inner walls of the conveying pipeline. A first sealing ring is connected to the joint between the container-type mechanical seal assembly and the conveying pipeline, and the first sealing ring is sleeved on the smooth rod segment.

6. A dry powder feeding device for a kettle according to claim 5, characterized in that: A retaining ring is arranged at the front side of the bearing assembly, and a second sealing ring is connected to the front side of the retaining ring. The second sealing ring is sleeved on the polished rod segment.

7. A dry powder feeding device for kettle according to claim 5 or 6, characterized in that: The shaft shoulder structure is sleeved with a phenolic cloth wear-resistant support ring.

8. A dry powder feeding device for a kettle according to claim 1, characterized in that: The upper end of the feed pipe is used to connect to the storage bin.

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