A wet granulator stirring paddle shaft cooling device

Abstract

The utility model discloses a kind of wet granulator stirring paddle shaft cooling devices, belong to cooling mechanism technical field, first inlet pipe is rotationally sleeved with stirring paddle shaft, hot water return channel is formed between first inlet pipe and stirring paddle shaft, outlet hole for connecting hot water return channel and cold water inlet channel is provided on first inlet pipe, fixed joint is provided at the lower end of first inlet pipe, backwater pipe, which is communicated with hot water return channel, and inlet pipe, which is communicated with cold water inlet channel, are provided on fixed joint, stirring paddle is installed on stirring paddle shaft.The wet granulator stirring paddle shaft cooling device of the application forms circulation channel between stirring paddle shaft and inlet pipe through innovative waterway design, so that cold water can continuously exchange heat with stirring paddle shaft and stirring paddle, efficiently take away the heat generated during material mixing and granulating, effectively control the temperature of materials in kettle body, avoid powder explosion caused by high temperature, fundamentally solve the safety hazard of special material granulation, and ensure production safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of cooling mechanisms, and in particular to a cooling device for the agitator shaft of a wet granulation machine. Background Technology

[0002] With the continuous development of pharmaceutical raw materials, pharmaceutical manufacturers have increasingly higher requirements for granulation equipment. Some manufacturers' special materials generate a lot of heat during mixing and granulation, and the temperature of the material and granulation pot also rises accordingly. Since the pot is a closed structure, if the temperature rises to a certain level, a powder explosion will occur, causing serious personal and property losses. How to monitor the temperature inside the pot and keep the granulation process at a safe temperature, and effectively control the temperature of the material inside the pot, has been a technical problem that has plagued manufacturers at home and abroad for many years. To address this, our company has designed a cooling device for the stirring paddle shaft of a wet granulator. This device can reduce the temperature of the stirring paddle shaft during the mixing process, allowing the material to be mixed and granulated at a safe temperature, thereby achieving the goal of safe production. Utility Model Content

[0003] Purpose of the utility model: To provide a cooling device for the agitator shaft of a wet granulation machine, so as to solve the above-mentioned problems existing in the prior art.

[0004] Technical solution: A cooling device for a stirring paddle shaft of a wet granulation mill, comprising: a first water inlet pipe, a stirring paddle shaft rotatably mounted on the first water inlet pipe, a hot water return channel formed between the first water inlet pipe and the stirring paddle shaft, an outlet hole provided on the first water inlet pipe for connecting the hot water return channel and a cold water inlet channel, a fixed joint provided at the lower end of the first water inlet pipe, a return pipe connected to the hot water return channel and a second water inlet pipe connected to the cold water inlet channel provided on the fixed joint, and a stirring paddle mounted on the stirring paddle shaft.

[0005] Furthermore, it also includes a hollow reducer shaft, which is fixedly mounted on the agitator shaft and installed at the output end of the reducer.

[0006] Furthermore, the impeller shaft is connected to the hollow shaft of the reducer via a coupling, and the coupling is connected to the impeller shaft and the hollow shaft of the reducer respectively via keys.

[0007] Furthermore, a stirring shaft bolt is provided at the upper end of the stirring paddle shaft, and the stirring paddle is fitted onto the stirring paddle shaft and locked in place by the stirring shaft nut cooperating with the stirring shaft bolt.

[0008] Furthermore, a sealing ring is fitted onto the bolt of the stirring shaft.

[0009] Furthermore, it also includes a temperature sensor for detecting the temperature of the outer wall of the impeller shaft.

[0010] Furthermore, a rotating joint is fitted onto the first water inlet pipe, and the rotating joint is fixedly connected to the lower end of the hollow shaft of the reducer.

[0011] Furthermore, a rotary joint is rotatably provided on the fixed joint, and the rotary joint is fixedly connected to the rotary joint.

[0012] Furthermore, the impeller shaft is mounted on a bearing housing.

[0013] Furthermore, a plurality of the water outlet holes are arranged in a circumferential array on the top sidewall of the first water inlet pipe.

[0014] Beneficial effects: The wet granulator mixing paddle shaft cooling device of this application, through innovative water circuit design, forms a circulation channel between the mixing paddle shaft and the first water inlet pipe, so that cold water can continuously exchange heat with the mixing paddle shaft and mixing paddle, efficiently remove the heat generated during material mixing and granulation, effectively control the material temperature in the pot, avoid powder explosion caused by high temperature, fundamentally solve the safety hazards of special material granulation, and ensure production safety.

[0015] The device in this application has a compact structure and is easy to assemble and disassemble. The components are connected by standard parts such as bolts, nuts, and keys. The design of fixing the stirring paddle to the shaft and connecting the rotary joint to the water circuit facilitates quick disassembly and installation. This not only reduces the difficulty of daily cleaning, but also saves time for equipment maintenance and replacement of parts, greatly improving equipment maintenance efficiency and meeting the high requirements of the pharmaceutical industry for equipment cleanliness and ease of maintenance.

[0016] This application integrates a temperature sensor to monitor the temperature of the stirring paddle shaft in real time. When the temperature exceeds the safe range, a high-temperature alarm is triggered, enabling precise temperature control during the granulation process. Simultaneously, the optimized configuration of the reducer and transmission structure ensures stable stirring speed, reducing additional heat generation caused by speed fluctuations and further improving the reliability of temperature control, thus guaranteeing a stable and efficient granulation process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a utility model Figure 1 A magnified view of part A in the image; Figure 3 This is a utility model Figure 1 A magnified view of part B in the image.

[0018] The attached diagram is labeled as follows: 1. First water inlet pipe; 2. Agitator shaft; 3. Hot water return channel; 4. Cold water inlet channel; 5. Water outlet; 6. Fixed joint; 7. Return pipe; 8. Second water inlet pipe; 9. Agitator; 10. Hollow shaft of reducer; 11. Reducer; 12. Coupling; 13. Key; 14. Agitator shaft bolt; 15. Agitator shaft nut; 16. Sealing ring; 17. Temperature sensor; 18. Rotary joint; 19. Rotary joint; 20. Bearing seat. Detailed Implementation

[0019] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0020] Example: Figure 1 - Figure 3 As shown, a cooling device for a wet granulation mill impeller shaft includes: a first water inlet pipe 1, an impeller shaft 2 rotatably mounted on the first water inlet pipe 1, a hot water return channel 3 forming between the first water inlet pipe 1 and the impeller shaft 2, an outlet hole 5 for connecting the hot water return channel 3 and a cold water inlet channel 4 on the first water inlet pipe 1, a fixed joint 6 at the lower end of the first water inlet pipe 1, a return pipe 7 connected to the hot water return channel 3 and a second water inlet pipe 8 connected to the cold water inlet channel 4 on the fixed joint 6, and an impeller 9 mounted on the impeller shaft 2. It also includes a hollow reducer shaft 10, which is fixedly mounted on the impeller shaft 2 and installed at the output end of a reducer 11. The impeller shaft 2 and the hollow reducer shaft 10 are connected by a coupling 12, which is connected to both the impeller shaft 2 and the hollow reducer shaft 10 by keys 13. A stirring shaft bolt 14 is provided at the upper end of the stirring shaft 2. The stirring paddle 9 is fitted onto the stirring shaft 2 and locked in place by a stirring shaft nut 15 cooperating with the stirring shaft bolt 14. A sealing ring 16 is fitted onto the stirring shaft bolt 14. A temperature sensor 17 for detecting the temperature of the outer wall of the stirring shaft 2 is also included. A rotary joint 18 is fitted onto the first water inlet pipe 1, and the rotary joint 18 is fixedly connected to the lower end of the hollow shaft 10 of the reducer. A rotary joint 19 is rotatably provided on the fixed joint 6, and the rotary joint 19 is fixedly connected to the rotary joint 18. The stirring shaft 2 is mounted on a bearing seat 20. A plurality of water outlet holes 5 are arranged in a circumferential array on the top side wall of the first water inlet pipe 1.

[0021] The first water inlet pipe 1 serves as a channel for cold water delivery. Installed inside the agitator shaft 2, it is responsible for stably delivering external cold water to the top area of ​​the agitator shaft. By continuously delivering cold water, it provides a cooling source for the agitator shaft and agitator 9, ensuring that the cooling capacity reaches key heat exchange components. This effectively absorbs the heat generated during the mixing process, reduces the temperature of the agitator shaft and agitator, and prevents safety hazards caused by high temperatures in the materials. It is a fundamental component for achieving the cooling function.

[0022] The agitator shaft 2 adopts a hollow structure design, with the first water inlet pipe 1 installed inside, forming a hot water return channel 3 between them. Its main functions are: firstly, to serve as the mounting carrier for the agitator 9, fixing it with the agitator shaft bolts 14 and nut 15, and driving the agitator to rotate to achieve material mixing and granulation; secondly, to serve as a key heat exchange component in the cooling system, the hollow structure allowing cold water to exchange heat with the shaft wall inside, while simultaneously transferring heat to the water in the hot water return channel, thus cooling itself and the agitator. This structure combines agitation and cooling functions, effectively controlling material temperature while ensuring granulation effect and guaranteeing production safety.

[0023] The hot water return channel 3 is formed by the annular gap between the first inlet pipe 1 and the agitator shaft 2. Its function is to contain the hot water after heat exchange and discharge it. After cold water enters the channel through the outlet hole 5 at the top of the first inlet pipe 1, it comes into full contact with the inner wall of the agitator shaft 2, absorbs the heat transferred by the agitator shaft and agitator 9, and forms hot water, which is then discharged through the return pipe 7, thereby completing the heat transfer, ensuring the continuous cooling process, and maintaining the low temperature of the agitator shaft.

[0024] The cold water inlet channel 4 is a hollow channel inside the first inlet pipe 1, specifically used to transport external cold water to the top of the inlet pipe. Its function is to precisely guide the cold water to the outlet hole 5, ensuring that the cold water can smoothly enter the hot water return channel 3 and exchange heat with the agitator shaft 2. It is a critical path for cold water transportation, directly affecting the cooling efficiency and ensuring that the cold source can effectively reach the heat exchange area.

[0025] The water outlet holes 5 are arranged in a circumferential array on the top side wall of the first water inlet pipe 1. Their function is to guide the cold water transported by the cold water inlet channel 4 to the hot water return channel 3. Through this structure, the cold water can flow out from the inside of the water inlet pipe and fully contact the inner wall of the stirring paddle shaft 2, thereby expanding the heat exchange area, improving the heat exchange efficiency, and enabling the cold water to quickly absorb the heat generated by the stirring paddle shaft, ensuring the cooling effect.

[0026] A fixed connector 6 is installed at the lower end of the first inlet pipe 1, and connects to the return pipe 7 and the second inlet pipe 8. Its function is to achieve a fixed connection of the water circuit, connecting the external cold water source to the cold water inlet channel 4, and simultaneously connecting the hot water return channel 3 to the return pipe 7. This fixed design avoids water circuit entanglement caused by the rotation of the agitator shaft 2, ensuring the stability of cold water supply and hot water discharge, and providing a reliable connection foundation for the cooling circulation.

[0027] The return water pipe 7 is connected to the fixed joint 6 and communicates with the hot water return channel 3. Its function is to discharge the hot water that has undergone heat exchange in the hot water return channel to the outside. By timely discharging the hot water that has absorbed heat, space is made for the entry of new cold water, ensuring smooth circulation of the cooling system, continuously removing the heat generated during the stirring process, and maintaining the stability of the cooling effect.

[0028] The second water inlet pipe 8 is connected to the fixed connector 6 and communicates with the cold water inlet channel 4. Its function is to introduce cold water from an external cold water source, such as a cold water supply system, into the cold water inlet channel. As the cold source input path of the cooling system, it provides a continuous supply of cold water for the entire cooling process, which is a prerequisite for ensuring the cooling function and ensuring that there is enough cold energy to absorb the heat generated by stirring.

[0029] The agitator 9 is mounted on the agitator shaft 2 and fixed to the agitator shaft nut 15 by the agitator shaft bolt 14. Its direct function is to agitate and mix the materials to achieve the granulation process. At the same time, because it is tightly connected to the agitator shaft 2, it can indirectly cool itself through the cooling of the agitator shaft, thereby reducing the temperature of the materials it comes into contact with. This avoids the risk of explosion caused by high temperatures generated by agitation friction or reaction, ensuring both granulation effect and production safety.

[0030] The hollow shaft 10 of the reducer is fixedly mounted on the agitator shaft 2 and installed at the output end of the reducer 11. Its function is to transmit the power and torque output from the reducer 11 to the agitator shaft 2. Simultaneously, its hollow structure provides space for the installation of the agitator shaft 2, ensuring a stable connection between the agitator shaft and the reducer. By transmitting power, the agitator shaft is driven to rotate, ensuring that the agitator 9 performs agitation at a suitable speed, meeting the requirements of the granulation process.

[0031] The reducer 11 has a hollow reducer shaft 10 installed at its output end. Its main function is to provide power and reduce and regulate the speed of the motor. By outputting appropriate speed and torque, it ensures that the stirring paddle shaft 2 drives the stirring paddle 9 to rotate at a speed that meets the requirements of the granulation process. This ensures that the material is mixed evenly and the granulation effect is good, while avoiding excessive heat generated by excessive friction of the material due to excessive speed, thus indirectly assisting in temperature control.

[0032] Coupling 12 connects the agitator shaft 2 and the hollow reducer shaft 10, and is connected to both via key 13. Its core function is to transmit torque, compensate for any coaxiality errors that may occur during installation, and reduce vibration and impact caused by shaft misalignment. By stably transmitting power, it ensures that the agitator shaft 2 can rotate synchronously with the hollow reducer shaft 10, ensuring the continuity and stability of the mixing operation and extending the equipment's service life.

[0033] Keys 13 are respectively embedded in the keyways of coupling 12 and agitator shaft 2, and coupling 12 and reducer hollow shaft 10. Their function is to achieve circumferential fixation, prevent relative sliding between the coupling and the shaft, and ensure effective torque transmission. Reliable circumferential positioning ensures the efficiency and stability of power transmission, avoids power loss or equipment wear due to sliding, and guarantees the normal operation of the mixing system.

[0034] The stirring shaft bolt 14 is located on the upper end of the stirring paddle shaft 2 and works in conjunction with the stirring shaft nut 15. Its function is to secure the stirring paddle 9. After the stirring paddle is mounted on the stirring paddle shaft, the bolt and nut lock the stirring paddle firmly onto the shaft, preventing it from loosening or falling off during high-speed rotation. This fixing method ensures that the stirring paddle can stably stir the material, guaranteeing the granulation effect, while avoiding safety hazards caused by a loose stirring paddle.

[0035] The stirring shaft nut 15 mates with the stirring shaft bolt 14, fitting onto the outside of the stirring paddle 9 and locking it in place. Its function is to further reinforce the connection between the stirring paddle 9 and the stirring paddle shaft 2. The axial force generated by the threaded engagement tightly presses the stirring paddle onto the stirring paddle shaft, enhancing the stability of the connection. When the stirring paddle rotates at high speed, it effectively resists centrifugal force, preventing displacement of the stirring paddle and ensuring the safety and reliability of the stirring operation.

[0036] The sealing ring 16 is fitted onto the agitator shaft bolt 14, located at the connection between the agitator 9 and the agitator shaft 2. Its function is to achieve a seal, preventing cold water in the cooling system from leaking through the connection gap. Through effective sealing, the integrity of the cooling water circuit is ensured, avoiding a decrease in cooling efficiency due to water leakage. It also prevents the cooling water from contacting the material and affecting its properties, while protecting other components of the equipment from water erosion damage.

[0037] Temperature sensor 17 is installed on the outer wall of the agitator shaft 2, and its function is to monitor the temperature of the agitator shaft in real time. By monitoring temperature changes, the signal is transmitted to the electrical control components. When the temperature exceeds the set safety value, a high-temperature alarm function can be triggered to remind the operator to take timely measures (such as adjusting the cooling water flow rate) to ensure that the temperature of the agitator shaft and the material is always within a safe range. This prevents explosion accidents caused by high temperatures from a monitoring perspective and ensures production safety.

[0038] The rotary joint 18 is fitted onto the first water inlet pipe 1 and fixedly connected to the lower end of the hollow shaft 10 of the reducer. Its function is to connect the rotating components (stirring paddle shaft, hollow reducer shaft) to the fixed water circuit components (rotary joint 19), ensuring the continuity of the water circuit during the rotation of the stirring paddle shaft. By rotating synchronously with the stirring paddle shaft and cooperating with the fixed end of the rotary joint 19, the connection conflict between the rotating components and the fixed water circuit is resolved, ensuring a continuous inflow of cooling water and smooth discharge of hot water, maintaining a stable cooling cycle.

[0039] The rotary joint 19 is rotatably mounted on the fixed joint 6 and fixedly connected to the rotary joint 18. It consists of a rotating end and a fixed end. Its function is to achieve a sealed connection between the rotating water passage (connected to the rotary joint and the agitator shaft) and the fixed water passage (connected to the fixed joint, the second inlet pipe 8, and the return pipe 7). The rotating end rotates with the agitator shaft, while the fixed end remains stationary. This relative rotation ensures smooth flow of cooling water and hot water while preventing leakage. It is a key component in solving the problem of connecting the rotating part to the fixed water passage, ensuring that the cooling system can still operate normally when the agitator shaft rotates.

[0040] The bearing housing 20 is used to install and support the agitator shaft 2. Its function is to provide stable rotational support for the agitator shaft and reduce radial and axial runout during rotation. Through stable support, vibration and wear of the shaft system are reduced, extending the service life of the agitator shaft and related components (such as bearings, couplings, etc.), while ensuring the smoothness of the rotation of the agitator 9 and improving the uniformity of the granulation effect.

[0041] The reducer 11 outputs power through the hollow reducer shaft 10, which is transmitted to the agitator shaft 2 via the coupling 12 and key 13. This drives the agitator shaft 2 and the agitator 9 mounted on it to rotate. The agitator 9 is fixed by the agitator shaft bolt 14 and the agitator shaft nut 15. During rotation, the material is mixed and granulated. Simultaneously, external cold water enters the fixed joint 6 through the second inlet pipe 8, is transported to the top through the cold water inlet channel 4 (i.e., inside the first inlet pipe 1), and then flows into the hot water return channel 3 between the first inlet pipe 1 and the agitator shaft 2 through the outlet hole 5. During this process, the cold water fully contacts the inner wall of the agitator shaft 2, absorbing the heat generated by the agitation of the material. At the same time, the heat is transferred to the agitator 9 through the agitator shaft 2, and the cold water also indirectly absorbs the heat from the agitator 9, forming hot water. The hot water flows downward along the hot water return channel 3 and is discharged from the fixed joint 6 through the return pipe 7. During operation, the rotary joint 18 rotates synchronously with the hollow shaft 10 of the reducer and the agitator shaft 2. One end of the rotary joint 19 is fixedly connected to the rotary joint 18 and rotates with it, while the other end is rotatably connected to the fixed joint 6 to maintain its fixation, ensuring that the water circuit does not leak during rotation. The sealing ring 16 further enhances the sealing effect. The temperature sensor 17 monitors the temperature of the outer wall of the agitator shaft 2 in real time. If it exceeds the safe range, the electrical control components trigger a high-temperature alarm. The bearing seat 20 provides stable support for the agitator shaft 2, ensuring that the entire device operates continuously and efficiently, achieving mixing and granulation of materials at a safe temperature.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A cooling device for the shaft of a stirring paddle in a wet granulation machine, characterized in that, include: A first water inlet pipe (1) is rotatably fitted with a stirring paddle shaft (2). A hot water return channel (3) is formed between the first water inlet pipe (1) and the stirring paddle shaft (2). A water outlet hole (5) is provided on the first water inlet pipe (1) for connecting the hot water return channel (3) with the cold water inlet channel (4). A fixed connector (6) is provided at the lower end of the first water inlet pipe (1). A return pipe (7) connected to the hot water return channel (3) and a second water inlet pipe (8) connected to the cold water inlet channel (4) are provided on the fixed connector (6). A stirring paddle (9) is installed on the stirring paddle shaft (2).

2. The cooling device for the stirring paddle shaft of a wet granulator according to claim 1, characterized in that, It also includes a hollow shaft (10) of a speed reducer, which is fixedly mounted on the agitator shaft (2) and installed at the output end of the speed reducer (11).

3. The cooling device for the stirring paddle shaft of a wet granulator according to claim 2, characterized in that, The stirring paddle shaft (2) is connected to the hollow shaft of the reducer (10) via a coupling (12). The coupling (12) is connected to the stirring paddle shaft (2) and the hollow shaft of the reducer (10) via keys (13).

4. A cooling device for the agitator shaft of a wet granulator according to claim 1, characterized in that, The upper end of the stirring shaft (2) is provided with a stirring shaft bolt (14), and the stirring blade (9) is fitted on the stirring shaft (2) and locked and fixed by the stirring shaft nut (15) cooperating with the stirring shaft bolt (14).

5. A cooling device for the agitator shaft of a wet granulator according to claim 4, characterized in that, A sealing ring (16) is fitted on the stirring shaft bolt (14).

6. A cooling device for the agitator shaft of a wet granulator according to claim 1, characterized in that, It also includes a temperature sensor (17) for detecting the temperature of the outer wall of the impeller shaft (2).

7. A cooling device for the agitator shaft of a wet granulator according to claim 2, characterized in that, A rotating joint (18) is fitted on the first water inlet pipe (1), and the rotating joint (18) is fixedly connected to the lower end of the hollow shaft (10) of the reducer.

8. A cooling device for the agitator shaft of a wet granulator according to claim 7, characterized in that, A rotary joint (19) is rotatably provided on the fixed joint (6), and the rotary joint (19) is fixedly connected to the rotary joint (18).

9. A cooling device for the agitator shaft of a wet granulator according to claim 1, characterized in that, The impeller shaft (2) is mounted on the bearing housing (20).

10. A cooling device for the agitator shaft of a wet granulator according to claim 1, characterized in that, Multiple water outlet holes (5) are arranged in a circular array on the top side wall of the first water inlet pipe (1).

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