Low-speed transmission device for kiln

Abstract

The utility model relates to the technical field of cement industrial equipment, and discloses a low-speed transmission device for a kiln, which comprises a driving motor, a planetary reducer and a spline clutch, the two ends of the planetary reducer are respectively in power transmission with the driving motor and the spline clutch, and a brake is arranged between the driving motor and the planetary reducer; the spline clutch comprises a driven external spline half coupling, a driving external spline half coupling and an internal spline sleeve, the internal spline sleeve is connected to the two half couplings in a sliding mode, the driving external spline half coupling inputs power inwards, and the driven external spline half coupling outputs power outwards. In practical application, the scheme solves the problems of low maintenance efficiency and high maintenance cost of the driving device of the cement lime rotary kiln.

Description

Technical Field

[0001] This utility model relates to the field of cement industry equipment technology, specifically to a slow-speed transmission device for kilns. Background Technology

[0002] In the dry process of cement clinker production, the cement-lime rotary kiln is an indispensable key piece of equipment. With its unique technological advantages, it can produce cement clinker with a high saturation ratio, exhibiting excellent performance in environmental protection, energy conservation, and product quality, thus possessing extremely broad market application prospects.

[0003] The drive system of a rotary kiln, as its core component, mainly consists of a main motor, main reducer, coupling, slow drive device, and large and small gears. Among these, the slow drive system plays a crucial role in the operation of the rotary kiln, primarily used to adjust its balance position and to precisely adjust the kiln's orientation during maintenance. However, the slow drive system used in traditional rotary kilns has significant technical drawbacks. This system is typically equipped with a parallel-shaft universal gearbox and a claw clutch, resulting in an excessively large overall footprint, which restricts the layout and installation of the equipment in space-constrained industrial production environments. Furthermore, the structural limitations of the output claw clutch make it difficult to meet the actual needs of bidirectional rotation during on-site maintenance, causing numerous inconveniences, reducing maintenance efficiency, and increasing maintenance costs. Utility Model Content

[0004] The present invention aims to provide a slow-speed transmission device for kilns to solve the problems of low drive device and maintenance efficiency and high maintenance cost of cement and lime rotary kilns.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a slow-speed transmission device for kilns, comprising a drive motor, a planetary reducer, and a spline clutch. The planetary reducer transmits power to the drive motor and the spline clutch at both ends, respectively. A brake is provided between the drive motor and the planetary reducer. The spline clutch comprises a driven external spline half-coupling, an active external spline half-coupling, and an inner spline sleeve. The inner spline sleeve is slidably connected to the two half-couplings. The active external spline half-coupling inputs power inward, and the driven external spline half-coupling outputs power outward.

[0006] The principles and advantages of this scheme are:

[0007] 1. The splined clutch achieves the bidirectional rotation requirement for maintenance:

[0008] The old-style claw clutch, limited by its mechanical structure, can only achieve unidirectional rotational output, which is severely out of step with the actual need for flexible bidirectional adjustment of the rotary kiln shell during on-site maintenance. During maintenance, changing the rotation direction of the shell often requires additional complex and time-consuming auxiliary mechanical devices, or a large amount of manpower for tedious reassembly and adjustment of mechanical parts. This not only results in low maintenance efficiency but also greatly increases the risk of equipment damage or safety accidents due to improper operation.

[0009] The splined clutch in this solution utilizes a combination structure of a driven external splined half-coupling, an active external splined half-coupling, and an internal splined sleeve. By leveraging the sliding fit of the internal splined sleeve on the two half-couplings, when power is input to the active external splined half-coupling, the internal splined sleeve can flexibly switch the power transmission path according to the power direction and operational requirements, achieving bidirectional output from the driven external splined half-coupling. This effectively solves the unidirectional rotation limitation of traditional clutches, greatly improving the flexibility and efficiency of maintenance work, reducing equipment downtime, and providing strong support for the continuity and stability of enterprise production.

[0010] 2. The equipment has a compact structure, improving space utilization:

[0011] In the context of increasingly scarce space resources in industrial production, the parallel-shaft universal gearbox in the old-style rotary kiln slow-drive system suffers from its bulky size due to its structural characteristics. Its complex parallel-shaft design results in long gear transmission paths and a large space occupation, severely restricting the flexibility of equipment layout within limited spaces. This solution, however, utilizes a planetary reducer with its unique planetary gear train structure, where multiple planetary gears are evenly distributed around a central sun gear and participate in transmission simultaneously. This structure significantly shortens the transmission path and highly integrates the gear transmission components that were originally dispersed on the parallel shaft, significantly reducing the overall size of the reducer while achieving the same or even higher transmission performance. Practical experience has shown that this greatly improves the space utilization of production sites, providing a feasible solution for enterprises to upgrade equipment and increase production capacity within limited space.

[0012] 3. Improve safety braking and enhance equipment reliability:

[0013] During the operation of rotary kiln equipment, due to its complex operating environment and high-speed rotating mechanical components, unexpected situations such as motor failure or sudden damage to transmission components can easily lead to uncontrolled operation and serious safety accidents and equipment damage if effective braking measures are lacking. Traditional slow-drive systems often suffer from slow response and insufficient braking precision, making it difficult to quickly and reliably stop the equipment in emergencies. This solution installs a brake between the drive motor and the planetary reducer. Upon detecting an abnormal signal, it can quickly cut off the power transmission from the drive motor to the planetary reducer. Simultaneously, the brake's braking torque, precisely calculated and optimized, can overcome the inertia of the rotary kiln shell and transmission components in a short time, allowing the equipment to stop smoothly and reliably at the designated position. During equipment maintenance, the brake ensures the slow-drive device is locked, preventing accidental start-up due to misoperation or external interference, creating a safe working environment for maintenance personnel, and effectively improving the overall safety and reliability of the equipment.

[0014] 4. More efficient and stable power transmission:

[0015] The efficiency and stability of power transmission are key indicators for the normal operation of rotary kiln equipment. In older slow-drive systems, the combination of a parallel-shaft universal gearbox and a claw clutch introduces numerous energy losses and instabilities during power transmission. Parallel-shaft gear drives are prone to significant tooth surface friction losses, and due to the inherent characteristics of their parallel-shaft structure, they are susceptible to vibration and noise when transmitting high power, affecting the smoothness of power transmission. The claw clutch's relatively rough connection method is prone to impacts and jamming during power switching, further exacerbating energy losses and equipment wear.

[0016] This solution establishes a highly efficient and stable power transmission system through the coordinated operation of the drive motor, planetary reducer, and splined clutch. The planetary reducer, with its high-precision gear machining and optimized planetary gear train structure, boasts high transmission efficiency, enabling the efficient and precise transmission of power from the drive motor to the splined clutch. The splined clutch employs a high-precision spline connection with minimal tooth backlash, effectively reducing impact and vibration during power transmission and ensuring smooth power delivery. This significantly extends the overall performance and service life of the equipment, bringing substantial economic and production benefits to the enterprise.

[0017] Furthermore, the passive external spline half-coupling and the active external spline half-coupling are provided with spline structures at opposite ends, and the axial lengths of the spline structures of the two are the same.

[0018] Beneficial effects: Both the passive and active external spline half-couplings have spline structures at opposite ends, and the axial lengths of the spline structures in both are consistent. This improvement results in more uniform and stable power transmission when the internal spline sleeve slides on the two half-couplings. Because the spline structure lengths are consistent, the internal spline sleeve can achieve more precise alignment when switching power transmission paths, avoiding power transmission bottlenecks or jamming caused by differences in spline structures.

[0019] Furthermore, the inner spline sleeve is initially positioned at the center of the passive external spline half-coupling and the active external spline half-coupling.

[0020] Beneficial effects: The above configuration, on the one hand, ensures that when the inner spline sleeve is initially positioned between the passive and active external spline half-couplings, the distance the inner spline sleeve needs to move is minimized, regardless of whether power needs to be transmitted from the active external spline half-coupling to the passive external spline half-coupling or in the reverse direction. In actual operation of the rotary kiln, especially under conditions requiring frequent changes in rotation direction, this design significantly shortens the response time for power switching, ensuring the equipment can quickly respond to operating commands and improving the flexibility and emergency response capabilities of the equipment.

[0021] On the other hand, the initial centered position ensures a more balanced force on the spline connections on both sides of the inner spline sleeve during power transmission. During power transmission, the inner spline sleeve moves to the same starting point in either direction, avoiding the problem of premature or excessive force on one side of the spline caused by an initial position biased to one side. This helps maintain the balance of the entire spline clutch system during power transmission, reducing vibration and noise caused by uneven force distribution.

[0022] Furthermore, the outer periphery of the inner spline sleeve is provided with a shift fork groove, the shift fork groove contains a shift fork, the shift fork is used to control the axial movement of the inner spline sleeve; a support structure is connected to the bottom of the shift fork.

[0023] Beneficial effects: The addition of a shift fork groove on the outer circumference of the inner spline sleeve, and the control of the shift fork to move the inner spline sleeve axially, significantly improves the accuracy and efficiency of power transmission switching. This greatly satisfies the need for bidirectional rotation during maintenance, reduces maintenance difficulty, and increases efficiency. Furthermore, the support structure connected to the bottom of the shift fork provides stable support for the entire power transmission switching system. During equipment operation, especially during high-speed rotation of the rotary kiln and frequent switching of power transmission directions, the shift fork and inner spline sleeve are subjected to significant impact forces and vibrations. The support structure effectively disperses these external forces, reducing the swaying and displacement of the shift fork and inner spline sleeve, thereby ensuring the stability of the spline clutch system.

[0024] Furthermore, the spline clutch and the central shaft of the drive motor are designed to be non-coaxial.

[0025] Beneficial effects: When the splined clutch and the drive motor's central shaft are coaxial, factors such as manufacturing precision, assembly errors, and wear during operation can easily lead to concentricity deviations in the shaft system, resulting in equipment vibration and noise. The non-coaxial design fundamentally reduces these vibration and noise hazards caused by concentricity issues. During operation, the non-coaxial splined clutch and drive motor rotate independently without interference, avoiding periodic forces caused by concentricity deviations in the shaft system.

[0026] Meanwhile, the non-coaxial design of both components creates favorable conditions for achieving a wider range of reduction ratios. Traditional coaxial designs, limited by shaft structure and spatial layout, often face numerous difficulties when increasing the reduction ratio, such as requiring a large number of gear stages, resulting in complex structures and large volumes. The non-coaxial design, however, allows for greater flexibility in the selection and layout of reduction gears such as planetary gearboxes. Gearboxes with a wider reduction ratio range can be selected, and through reasonable transmission combinations, a wider range of speed adjustments can be achieved. This means that the equipment can achieve lower and more precise speeds at the output end, while providing greater torque. When processing some hard and difficult-to-process materials in a rotary kiln, a larger reduction ratio allows the equipment to output sufficient torque to stably drive the cylinder rotation, ensuring that the material is fully processed, thus improving the equipment's power performance and production efficiency.

[0027] Furthermore, the planetary reducer includes at least one stage of parallel gears and two or more stages of planetary gears.

[0028] Beneficial effects: Integrating at least one stage of parallel gears and two or more stages of planetary gears into the planetary reducer effectively expands the adjustment range of the reduction ratio. The parallel gears enrich the transmission path, can undertake part of the reduction task, and work in conjunction with multi-stage planetary gears. Through combinations of different gear tooth counts, more diverse reduction ratio settings can be achieved, expanding the speed ratio range. This allows the equipment to achieve lower and more precise speeds at the output end, meeting the stringent speed requirements of different production processes. Furthermore, the spline clutch adopts a small module gear system.

[0029] Secondly, the multi-stage planetary gear design effectively enhances the stability of power transmission. During power transmission, multiple planetary gears are evenly distributed around the central sun gear and participate in the transmission simultaneously, which can distribute torque more evenly to each gear and reduce the stress on individual gears. At the same time, the parallel gears and planetary gears cooperate with each other to form a more stable transmission chain. This synergistic effect reduces vibration and noise caused by poor meshing or uneven force between gears.

[0030] Furthermore, the spline clutch adopts a module gear system with a module less than or equal to 1.

[0031] Beneficial Effects: This solution employs a small module gear system (where the tooth module is less than or equal to 1). Firstly, it simplifies and speeds up alignment during equipment installation and commissioning. Compared to the traditional large module gear system, the small module gear system has a smaller tooth pitch and more teeth per unit length. This allows for more precise positioning and rapid alignment when assembling the spline sleeve and the inner and outer spline half-couplings. In practice, installers can accurately align the components of the spline clutch using only visual inspection and simple tools, significantly reducing installation and commissioning time.

[0032] On the other hand, small-module tooth splines perform better during engagement and disengagement. When the inner spline sleeve moves between the driven and driving external spline half-couplings, the fine structure of the small-module teeth provides a smoother transition. Due to the small tooth pitch, the spline sleeve engages and disengages more smoothly with the inner and outer spline half-couplings during axial movement, reducing power transmission interruptions or instability caused by tooth collisions and jamming. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: drive motor 1, brake 2, planetary reducer 3, spline clutch 4, passive external spline half coupling 41, inner spline sleeve 42, active external spline half coupling 43, base 5, shift fork groove 6, shift fork 7, support shaft 8.

[0036] The basic implementation examples are as follows: Figure 1 As shown:

[0037] A slow-speed transmission device for kilns includes a drive motor 1, a planetary reducer 3, and a splined clutch 4. The planetary reducer 3 transmits power to the drive motor 1 and the splined clutch 4 at both ends, respectively. A brake 2 is provided between the drive motor 1 and the planetary reducer 3. The drive motor 1, planetary reducer 3, and splined clutch 4 are all fixed on a base 5. The splined clutch 4 includes a driven external splined half-coupling 41, an active external splined half-coupling 43, and an inner splined sleeve 42. The inner splined sleeve 42 is slidably connected to the two half-couplings. The active external splined half-coupling 43 is connected to the drive motor 1 to input power inwards, and the driven external splined half-coupling 41 is connected to the cement-lime rotary kiln to output power outwards.

[0038] The passive external spline half-coupling 41 and the active external spline half-coupling 43 have spline structures at opposite ends, and the axial lengths of the spline structures of both are the same. The inner spline sleeve 42 is initially positioned centrally between the passive external spline half-coupling 41 and the active external spline half-coupling 43. With consistent spline lengths, the inner spline sleeve 42 can achieve more precise alignment when switching power transmission paths, avoiding power transmission bottlenecks or jamming caused by differences in spline structures. Furthermore, when the inner spline sleeve 42 is initially positioned centrally between the passive external spline half-coupling 41 and the active external spline half-coupling 43, the distance the inner spline sleeve 42 needs to move is minimized, whether power needs to be transmitted from the active external spline half-coupling 43 to the passive external spline half-coupling 41 or in the opposite direction, resulting in the shortest switching response time.

[0039] The inner spline sleeve 42 has a fork groove 6 on its outer periphery, which houses a fork 7. The fork 7 controls the axial movement of the inner spline sleeve 42. A support structure, namely a support shaft 8, is connected to the bottom of the fork 7. The inner spline sleeve 42 extends forward under the control of the fork 7 to connect with the cement-lime rotary kiln, and moves backward to separate from it. The fork 7 can be driven by an electric or pneumatic control system. The operator only needs to control the connection between the inner spline sleeve 42 and the passive outer spline half-coupling 41 to easily switch the drive direction, allowing the ball mill cylinder to easily rotate in the forward or reverse direction according to actual needs. The entire operation process is smooth and efficient, greatly improving the work experience during maintenance. In addition, when the electric or pneumatic system is under maintenance or malfunctioning, workers can move the fork 7 on the ground via the support shaft 8 to ensure the continuity of equipment operation.

[0040] The spline clutch 4 and the drive motor 1 are parallel to each other but are not coaxial. The non-coaxial spline clutch 4 and the drive motor 1 rotate independently and do not interfere with each other, thus avoiding the periodic force caused by the concentricity deviation of the shaft system.

[0041] The planetary reducer 3 includes at least one stage of parallel gears and two or more stages of planetary gears. The parallel gears enrich the transmission path and can undertake part of the speed reduction task. Working in conjunction with the multi-stage planetary gears, a more diverse range of reduction ratio settings can be achieved through different combinations of gear teeth, expanding the speed ratio coverage. This allows the equipment to obtain a lower and more precise speed at the output end, meeting the strict speed requirements of different production processes.

[0042] Preferably, the spline clutch 4 adopts a small module gear system, where the gear module is less than or equal to 1. On the one hand, during equipment installation and commissioning, alignment becomes simpler and faster. Compared to the traditional large module gear system, the small module gear has a smaller tooth pitch and more teeth per unit length. This allows for more precise position adjustment and rapid alignment when assembling the inner spline sleeve 42 with the driven external spline half-coupling 41 and the driving external spline half-coupling 43, shortening installation and commissioning time. On the other hand, when the inner spline sleeve 42 moves between the driven external spline half-coupling 41 and the driving external spline half-coupling 43, the fine structure of the small module teeth provides a smoother transition. Due to the small tooth pitch, the engagement and disengagement of the inner spline sleeve 42 with the external spline half-coupling is smoother during axial movement, reducing power transmission interruptions or instability caused by tooth collisions and jamming.

[0043] During specific maintenance, the moving fork 7 moves the inner spline sleeve 42 toward the drive motor 1, disengaging it from the passive outer spline coupling 41, thus disconnecting the power transmission between the drive system and the cement-lime rotary kiln, facilitating bidirectional rotational maintenance.

[0044] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A slow speed transmission for a kiln, characterized by: The drive motor, the planetary reducer and the spline clutch are included, the planetary reducer is respectively connected with the drive motor and the spline clutch at both ends for power transmission, and the brake is arranged between the drive motor and the planetary reducer.

2. A slow speed transmission for a kiln as claimed in claim 1 wherein: The passive outer spline half-coupling and the active outer spline half-coupling are provided with spline structures at opposite ends, and the axial lengths of the spline structures of the two are consistent.

3. A slow speed transmission for a kiln as claimed in claim 2 wherein: The inner spline sleeve is located at the central position of the passive outer spline half-coupling and the active outer spline half-coupling in the initial state.

4. A slow speed transmission for a kiln as claimed in claim 3 wherein: The outer periphery of the inner spline sleeve is provided with a shift fork groove, and the shift fork groove contains a shift fork, which is used for controlling the axial movement of the inner spline sleeve; the bottom of the shift fork is connected with a support structure.

5. A slow speed drive for a kiln as claimed in claim 1, wherein: The spline clutch and the central shaft of the drive motor are non-coaxial design.

6. A slow speed drive for a kiln as claimed in claim 5 wherein: The planetary reducer contains at least one parallel gear stage and more than two planetary gear stages.

7. A slow speed drive for a kiln as claimed in claim 6 wherein: The spline clutch adopts a modulus gear with a modulus less than or equal to 1.

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