A double shaft premixer for ammonium chloride rotary drier
By adopting a dual-shaft stirring structure and heating and insulation device in the ammonium chloride rotary dryer, the problems of uneven mixing, clogging and high energy consumption of the single-shaft premixer have been solved, achieving more efficient mixing and heat exchange, and improving product quality and production continuity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU TIANBAO POWER SAVING ENG CO LTD
- Filing Date
- 2025-09-04
- Publication Date
- 2026-08-04
AI Technical Summary
The existing single-shaft premixer of the ammonium chloride rotary dryer has problems such as poor mixing uniformity, easy clogging and low energy utilization efficiency, resulting in uneven mixing, low heat exchange efficiency, unstable product quality and poor continuous operation capability.
It adopts a dual-shaft stirring structure, combined with a heating and insulation device. Through the cooperation of the drive shaft and the driven shaft, the torque is transmitted by synchronous gears to ensure that the blades peel off the material during rotation, avoiding blockage. The jacket heating and insulation improves the material flowability and achieves more uniform mixing.
It improves mixing uniformity and heat exchange efficiency, eliminates clogging and shaft seizing, ensures the stability of the drying process and the consistency of product quality, significantly reduces energy consumption, and improves the continuous operation capability and efficiency of the production line.
Smart Images
Figure CN224593612U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of ammonium chloride rotary drying technology, and particularly relates to a bi-shaft premixer for an ammonium chloride rotary drying oven. Background Technology
[0002] Currently, rotary ammonium chloride dryers typically premix the returned material with the raw material before feeding it into the furnace head. The premixer thoroughly mixes the wet ammonium with the dried ammonium chloride, reducing the moisture content of the material entering the furnace. The mixture is also kept warm and heated to improve its fluidity and prevent accumulation and scaling at the furnace head.
[0003] Currently, the premixing process commonly uses a single-shaft agitator premixer. This equipment typically includes a horizontal cylinder, a stirring shaft running through the cylinder, and spiral or paddle-type stirring blades mounted on the shaft. A motor drives the stirring shaft to rotate, and the rotation of the blades pushes and agitates the return material and raw material inside the cylinder to achieve mixing.
[0004] However, this traditional single-shaft premixer has many inherent defects that urgently need to be addressed in the premixing application of ammonium chloride rotary dryer:
[0005] Poor mixing uniformity and insufficient process stability: Because stirring relies solely on blades on a single shaft, the resulting mixing force field is singular, primarily characterized by circumferential flow, with insufficient radial and axial mixing intensity. For materials with large moisture differences and a tendency to clump, it is difficult to quickly and effectively break up wet lumps, leading to significant unevenness in the mixture. Dead zones easily form inside the cylinder, causing some material to be discharged without sufficient mixing. This unevenly mixed material entering the drying oven causes fluctuations in heat exchange efficiency, with some material wasting energy due to over-drying and others affecting product quality due to insufficient drying, severely hindering the optimization of the drying oven's overall performance.
[0006] Prone to clogging and shaft seizure, resulting in poor continuous operation: When processing highly viscous wet materials, the material easily adheres to the mixing blades and main shaft, accumulating and forming what is known as "shaft seizure." This not only drastically increases the operating torque of the mixing shaft, causing the motor to overload and shut down, but also, in severe cases, blocks the material flow channel, leading to production interruptions. Operators must frequently stop the machine for cleaning and maintenance, which is not only labor-intensive and affects the production environment, but also significantly reduces the equipment's continuous operating time and production efficiency.
[0007] Low energy efficiency: To achieve the desired mixing effect, a single stirring structure often requires a high-power drive motor, but its effective mixing power is low, and a large amount of energy is consumed in ineffective friction and material extrusion, resulting in poor energy economy. Utility Model Content
[0008] In order to overcome the shortcomings of existing technologies, the purpose of this utility model is to propose a bi-shaft premixer for ammonium chloride rotary dryer, which fundamentally solves the problems of uneven mixing, easy clogging and high energy consumption of ammonium chloride materials.
[0009] To achieve the above objectives, the technical solution adopted by this utility model is: a bi-shaft premixer for an ammonium chloride rotary dryer, comprising:
[0010] The housing is equipped with a heating and heat preservation device.
[0011] Drive unit;
[0012] The dual-shaft mixing device is installed inside the housing, and the drive device drives the dual-shaft mixing device to rotate.
[0013] The dual-shaft mixing device:
[0014] The drive shaft is axially positioned inside the housing, and its shaft head is rotatably connected to the inside of the housing.
[0015] The driven shaft is axially disposed inside the housing, parallel to the driving shaft, and its shaft head is rotatably connected to the inside of the housing.
[0016] Synchronizing gears are installed on the shaft ends of the driving shaft and the driven shaft.
[0017] Furthermore, the heating and heat preservation device includes a jacket, which is arranged in multiple sections along the entire length of the outer wall of the shell.
[0018] Furthermore, a gear cover is provided on the synchronous gear, and an oil filling hole, an oil level gauge, an observation hole, and a drain port are provided on the gear cover.
[0019] Furthermore, bearings are provided on both the drive shaft and the driven shaft on the synchronous gear side; the shaft head of the drive shaft is rotatably connected to the inside of the housing via bearings; the shaft head of the driven shaft is rotatably connected to the inside of the housing via bearings.
[0020] Furthermore, the drive shaft includes a drive shaft head, a shaft tube, a shaft head, and a blade seat. The shaft tube has a shaft head and a drive shaft head at its two ends, respectively. The shaft head is rotatably connected to the inside of the housing. The drive shaft head is connected to a synchronous gear. Multiple blade seats are arranged in the shaft tube, and stirring blades are installed on the blade seats.
[0021] Furthermore, the driven shaft includes a driven shaft head, a shaft tube, a shaft head, and a blade seat. The two ends of the shaft tube are respectively provided with a shaft head and a drive shaft head. The shaft head is rotatably connected to the inside of the housing, and the drive shaft head is connected to a synchronous gear. Multiple blade seats are arranged in the shaft tube, and stirring blades are installed on the blade seats.
[0022] Furthermore, the stirring blades are mounted on the blade holder on the stirring shaft in the direction of material flow.
[0023] Furthermore, the housing is mounted on a support base.
[0024] Furthermore, the housing includes an end cap seal, an end cap, a hollow housing, a cleaning port, an observation port, and a cover plate; the cleaning port and observation port are located on the hollow housing, and the discharge port is located directly below the right side of the hollow housing; the cleaning port is located in the lower middle part of the hollow housing, and the observation port is located in the upper middle part of the hollow housing, with cleaning ports and observation ports provided in both the feeding section and the discharge section; the end cap is located at both ends of the hollow housing, and the end cap is divided into upper and lower parts, with the upper part being a detachable structure and the lower part having a bearing seat; the end cap seal is a packing seal structure; the cover plate includes multiple sub-cover plates, and the cover plate is provided with a return material inlet, a wet ammonium inlet, a vent, and a manhole.
[0025] Furthermore, the drive device includes a motor base, a motor, coupling I, a reducer, and coupling II. The motor and reducer are mounted on the motor base. The motor shaft is axially connected to coupling I, the reducer, and coupling II in sequence, and is connected to the drive shaft via a synchronous gear.
[0026] The beneficial effects of adopting this technical solution are:
[0027] This invention employs a dual-shaft stirring structure, with the active and driven shafts working in tandem. Simultaneously, a heating and insulation device ensures the stirring temperature, making it easier to disperse and mix highly viscous ammonium chloride materials. This prevents materials from clumping together, which affects mixing and significantly improves mixing uniformity. It also ensures the stability of the drying process and product quality. The mixed material exhibits highly uniform moisture content, resulting in extremely uniform heating within the steam rotary dryer. This greatly improves heat exchange efficiency and eliminates localized over-drying or under-drying. While significantly reducing steam consumption, it also guarantees the stability and consistency of the final product's moisture content.
[0028] This invention completely solves the problems of shaft seizure and clogging, enhancing continuous operation capability and reliability. The intermeshing blades, during rotation, can peel away material adhering to each other's shafts, effectively preventing material accumulation on the mixing shaft and blades, fundamentally eliminating shaft seizure. Simultaneously, the strong shearing and scattering action ensures smooth material flow, avoiding accumulation and blockage at the discharge port or cylinder wall. This enables the equipment to operate continuously and stably for extended periods, significantly reducing downtime due to cleaning and maintenance, and greatly improving the operational efficiency and continuity of the entire drying production line. Attached Figure Description
[0029] Figure 1This is a schematic diagram of the internal structure of a bi-shaft premixer for an ammonium chloride rotary dryer according to the present invention.
[0030] Figure 2 This is a schematic diagram of the external structure of a bi-shaft premixer for an ammonium chloride rotary dryer according to the present invention.
[0031] Figure 3 This is a schematic cross-sectional view of a bi-shaft premixer for an ammonium chloride rotary dryer according to the present invention.
[0032] Among them, 1-motor base, 2-motor, 3-coupling I, 4-reducer, 5-coupling II, 6-synchronous gear, 7-gear cover, 8-end cover seal, 9-end cover, 10-support base, 11-hollow shell, 12-jacket, 13-cleaning port, 14-observation port, 15-cover plate, 16-driven shaft, 17-drive shaft, 18-stirring blade, 19-return material inlet, 20-wet ammonium inlet, 21-air outlet, 22-manhole, 23-discharge port. Detailed Implementation
[0033] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described below with reference to the accompanying drawings.
[0034] In this embodiment, see Figures 1-2 As shown, a bi-shaft premixer for an ammonium chloride rotary dryer;
[0035] The dual-shaft mixing device:
[0036] The housing is equipped with a heating and heat preservation device.
[0037] Drive unit;
[0038] A dual-shaft mixing device, housed within a housing, is driven by a drive unit to rotate the dual-shaft mixing device, comprising:
[0039] The drive shaft 17 is axially disposed inside the housing, and the shaft head is rotatably connected to the inside of the housing.
[0040] Driven shaft 16 is axially disposed inside the housing, parallel to drive shaft 17, and its shaft head is rotatably connected to the inside of the housing.
[0041] The synchronous gear 6 is installed on the shaft ends of the drive shaft 17 and the driven shaft 16. It has three functions: first, to transmit torque; second, to adjust and ensure the phase of the drive shaft 17 and the driven shaft 16 so as to ensure that the blades on the two shafts do not interfere with each other during mixing; and third, to control the rotation direction of the two shafts to be consistent.
[0042] Synchronous gear 6 is located on the outside of the support bearing for easy installation and maintenance.
[0043] As an optimized embodiment, the heating and heat preservation device includes a jacket 12, which is arranged in multiple sections along the entire length of the outer wall of the shell. This multi-section structure results in a shorter flow path and easier temperature control. It heats and preserves the mixed ammonium chloride material, improving its fluidity and laying the foundation for reliable operation of the subsequent drying furnace. By controlling the temperature, the moisture content and temperature of the material entering the furnace are controlled, increasing its fluidity and preventing scaling within the furnace.
[0044] As an optimized embodiment, a gear cover 7 is provided on the synchronizing gear 6. The gear cover 7 is provided with an oil filling hole, an oil level gauge, an observation hole, and a drain port. In addition to effectively preventing dust and other impurities from contaminating the gear set and providing good lubrication, it also facilitates daily maintenance.
[0045] As an optimization of the above embodiment, bearings are provided on both the drive shaft 17 and the driven shaft 16 on the side of the synchronous gear 6, which can better ensure the transmission accuracy of the gear.
[0046] The shaft head of the drive shaft 17 is rotatably connected to the inside of the housing via a bearing; the shaft head of the driven shaft 16 is rotatably connected to the inside of the housing via a bearing; the bearings are designed with sufficient room for movement to accommodate thermal expansion, ensuring that the bearings will not be damaged due to excessive expansion during normal operation.
[0047] As an optimized solution of the above embodiment, the drive shaft 17 includes a drive shaft head, a shaft tube, a shaft head and a blade seat. The shaft tube is provided with a shaft head and a drive shaft head at both ends. The shaft head is rotatably connected to the inside of the housing. The drive shaft head is connected to the synchronous gear 6. Multiple blade seats are arranged in the shaft tube, and stirring blades 18 are installed on the blade seats.
[0048] The driven shaft 16 includes a driven shaft head, a shaft tube, a shaft head and a blade seat. The two ends of the shaft tube are respectively provided with a shaft head and a drive shaft head. The shaft head is rotatably connected to the inside of the housing. The drive shaft head is connected to the synchronous gear 6. Multiple blade seats are arranged in the shaft tube, and stirring blades 18 are installed on the blade seats.
[0049] Preferred, such as Figure 3 As shown, the stirring blades 18 are mounted on the blade seat on the stirring shaft in the direction of material flow and can be installed with screws.
[0050] As an optimized solution of the above embodiment, the housing is mounted on the support base 10, and the support base 10 evenly transmits the load to the ground.
[0051] As an optimized embodiment of the above, the housing includes an end cap seal 8, an end cap 9, a hollow housing 11, a cleaning port 13, an observation port 14, and a cover plate 15.
[0052] The cleaning port 13 and the observation port 14 are located on the hollow shell 11, and the discharge port 23 is located directly below the right side of the hollow shell 11. Each section is equipped with a water inlet, a water outlet, and an air vent.
[0053] The cleaning port 13 is located in the lower middle part of the hollow shell 11, and the observation port 14 is located in the upper middle part of the hollow shell 11. The cleaning port 13 and the observation port 14 are provided in both the feeding section and the discharge section, so as to facilitate the observation of the material flow at the inlet and outlet 23 and the clearing of blockages.
[0054] End caps 9 are located at both ends of the hollow shell 11. End caps 9 are divided into upper and lower parts. The upper part is a detachable structure that can be removed separately for easy assembly and maintenance of the stirring shaft. The lower part has a bearing seat. End cap seal 8 is a packing seal structure for easy adjustment and maintenance. Cover plate 15 includes multiple sub-cover plates 15. Cover plate 15 is provided with a return material inlet 19, a wet ammonium inlet 20, an air outlet 21, and a manhole 22.
[0055] As an optimized embodiment, the drive device includes a motor base 1, a motor 2, a coupling I 3, a reducer 4, and a coupling II 5. The motor 2 and the reducer 4 are mounted on the motor base 1. The shaft of the motor 2 is axially connected to coupling I 3, reducer 4, and coupling II 5 in sequence, and is connected to the drive shaft 17 via a synchronous gear 6. The entire drive device is assembled into a single module based on the motor base 1, facilitating on-site installation and adjustment. Direct torque transmission via couplings simplifies the transmission method.
[0056] To better understand this utility model, the working principle of this utility model will be described in detail below:
[0057] When the motor 2 starts, after being reduced by the reducer 4, the coupling drives the drive shaft 17 to rotate. At the same time, the synchronous gears 6, which are respectively assembled on the drive shaft 17 and the driven shaft 16, drive the driven shaft 16 to rotate in the opposite direction. Meanwhile, hot water is passed through the jacket 12 on the shell to preheat the shell. When the shell is preheated to a certain temperature, the feeding begins.
[0058] Dry material is first fed into the dryer through the return material inlet 19. Once the dry material has covered the inner wall of the drying shell, and material is flowing out of the outlet 23, wet ammonium can be fed into the dry ammonium inlet 20. The wet ammonium falls directly onto the shell covered with dry ammonium. As the drive shaft 17 and driven shaft 16 rotate upward, the wet and dry ammonium mix thoroughly, reducing the moisture content of the wet ammonium and improving its fluidity. Combined with the heating and insulation provided by the shell jacket 12, this ensures the material entering the furnace has a high inlet temperature and good fluidity, playing a positive role in the efficient and stable operation of the drying furnace. The mixed material is discharged from the outlet 23 and enters the inlet of the drying furnace. Due to the temperature difference between the return material and the wet ammonium, and the heating of the shell jacket 12, a certain amount of hot and humid gas is generated. This hot and humid gas is discharged from the outlet 21 on the cover plate 15 assembly.
[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A double shaft pre-mixer for ammonium chloride rotary dryers, characterized by, include: The housing is equipped with a heating and heat preservation device. Drive unit; The dual-shaft mixing device is installed inside the housing, and the drive device drives the dual-shaft mixing device to rotate. The biaxial mixing device includes: The drive shaft (17) is axially disposed inside the housing, and the shaft head is rotatably connected to the inside of the housing; The driven shaft (16) is axially arranged inside the housing and is parallel to the driving shaft (17). The shaft head is rotatably connected to the inside of the housing. Synchronous gears (6) are installed on the shaft ends of the drive shaft (17) and the driven shaft (16).
2. A double shaft premixer for ammonium chloride rotary drying furnace as claimed in claim 1, wherein, The heating and heat preservation device includes a jacket (12), which is arranged in multiple sections along the entire length of the outer wall of the shell.
3. A double shaft premixer for ammonium chloride rotary drying furnace as claimed in claim 1 wherein, A gear cover (7) is provided on the synchronous gear (6), and an oil injection hole, an oil level gauge, an observation hole and a drain port are provided on the gear cover (7).
4. A double shaft pre-mixer for ammonium chloride tumble dryers according to any of claims 1-3, characterized in that, Bearings are provided on both the drive shaft (17) and the driven shaft (16) on the side of the synchronous gear (6); the shaft head of the drive shaft (17) is rotatably connected to the inside of the housing through the bearing; the shaft head of the driven shaft (16) is rotatably connected to the inside of the housing through the bearing.
5. A double shaft premixer for ammonium chloride tumble dryer as claimed in claim 1 wherein, The drive shaft (17) includes a drive shaft head, a shaft tube, a shaft head and a blade seat. The shaft tube is provided with a shaft head and a drive shaft head at both ends. The shaft head is rotatably connected to the inside of the housing. The drive shaft head is connected to a synchronous gear (6). Multiple blade seats are arranged in the shaft tube. Stirring blades (18) are installed on the blade seats.
6. A double shaft premixer for ammonium chloride rotary drying furnace as claimed in claim 1 wherein, The driven shaft (16) includes a driven shaft head, a shaft tube, a shaft head and a blade seat. The two ends of the shaft tube are respectively provided with a shaft head and a drive shaft head. The shaft head is rotatably connected to the inside of the housing. The drive shaft head is connected to the synchronous gear (6). Multiple blade seats are arranged in the shaft tube, and stirring blades (18) are installed on the blade seats.
7. A double shaft pre-mixer for ammonium chloride tumble dryers according to claim 5 or 6, characterized in that, The stirring blades (18) are installed on the blade seat on the stirring shaft in the direction of material flow.
8. A double shaft pre-mixer for ammonium chloride rotary drying furnace as claimed in claim 1, 2, 3, 5 or 6 wherein, The housing includes an end cap seal (8), an end cap (9), a hollow housing (11), a cleaning port (13), an observation port (14), and a cover plate (15); the cleaning port (13) and the observation port (14) are located on the hollow housing (11), and the discharge port (23) is located directly below the right side of the hollow housing (11). The cleaning port (13) is located in the lower middle part of the hollow housing (11), and the observation port (14) is located in the upper middle part of the hollow housing (11). 13) Observation ports (14) are provided in both the feeding section and the discharging section; end caps (9) are located at both ends of the hollow shell (11). The end caps (9) are divided into upper and lower parts. The upper part is a detachable structure, and the lower part has a bearing seat; the end cap seal (8) is a packing seal structure; the cover plate (15) includes multiple sub-cover plates (15). The cover plate (15) is provided with a return material inlet (19), a wet ammonium inlet (20), an air outlet (21), and a manhole (22).
9. A double shaft pre-mixer for ammonium chloride rotary drying furnace as claimed in claim 1, 2, 3, 5 or 6 wherein, The housing is mounted on the support base (10).
10. A double shaft pre-mixer for ammonium chloride rotary drying furnace as claimed in claim 1, 2, 3, 5 or 6 wherein, The drive device includes a motor base (1), a motor (2), a coupling I (3), a reducer (4), and a coupling II (5). The motor (2) and the reducer (4) are mounted on the motor base (1). The shaft of the motor (2) is connected to the coupling I (3), the reducer (4), and the coupling II (5) in sequence in the axial direction, and is connected to the drive shaft (17) through a synchronous gear (6).