Transmission structure of wet rod mill

Abstract

The utility model relates to a transmission structure of a wet-type rod mill. The transmission structure comprises an output motor, a coupler, a pinion device, a bull gear and a barrel body, flanges are arranged at the two axial ends of the barrel, and the large gear is installed at the axial inner end of the flange on one side. The output motor is a permanent magnet motor and is installed on a motor base on the side of the barrel, the coupler is an elastic pin coupler, an output shaft of the permanent magnet motor is connected with the small gear device through the elastic pin coupler, the small gear device at least comprises a small gear meshed with the large gear, and the small gear is meshed with the large gear. The permanent magnet motor can drive the small gear to rotate to drive the large gear and the barrel to rotate. The permanent magnet motor and the elastic pin coupling are adopted to provide torque to drive the rod mill barrel to rotate, power consumption is remarkably reduced, high-inertia load generated when the rod mill is started is easily overcome, impact load and instantaneous vibration of the rod mill barrel are absorbed through the elastic pin coupling, a motor shaft and a transmission system are protected, and the service life of the rod mill is prolonged. The motor bearing life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of mining machinery and equipment technology, and in particular to a transmission structure for a wet rod mill. Background Technology

[0002] Wet rod mills are commonly used crushing equipment in industries such as mining, metallurgy, and building materials. Their transmission structure directly affects the equipment's operating efficiency and stability. Traditional wet rod mills typically use a motor driven by an air clutch, but this transmission method presents a series of problems in practical applications.

[0003] The existing rod mill is powered by an electric motor, and an air clutch is used to connect or disconnect the power transmission. Because the air clutch requires compressed air, an additional air compressor system is needed, increasing initial investment and maintenance costs. In terms of maintenance, leaks in the air lines and valves may affect clutch performance, leading to unstable transmission or shutdown. Furthermore, insufficient compressed air supply, such as unstable pressure, may affect the clutch's response speed and engagement / disengagement accuracy, thus impacting the rod mill's operating efficiency. In addition, the clutch may slip during transmission, especially under high loads. Slippage leads to reduced efficiency and generates additional heat, potentially requiring a cooling system, further increasing energy consumption and complexity. As a mechanical component, the air clutch may wear down over time, such as with the friction plates, requiring periodic replacement, increasing maintenance workload and spare parts costs. The air clutch's engagement and disengagement depends on compressed air pressure; delays may occur during emergency stops or rapid adjustments, affecting safety. Compared to variable frequency drives, air clutches have lower speed regulation flexibility, making precise speed control difficult. The engagement / disengagement of the clutch may generate significant noise, especially during high-pressure gas release, requiring additional noise reduction measures. In summary, the existing solution using a traditional motor and air clutch has problems such as high transmission costs, complex maintenance, energy loss, and environmental adaptability. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a transmission structure for a wet rod mill. In this structure, a permanent magnet motor and a flexible pin coupling are used to provide torque to drive the rod mill cylinder to rotate, thus solving the problems of large footprint, high maintenance costs, high energy consumption, and transmission efficiency loss caused by traditional motor and clutch transmission.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A transmission structure for a wet rod mill is characterized by comprising an output motor, a coupling, a pinion gear assembly, a large gear, and a cylinder; flanges are provided at both axial ends of the cylinder, and the large gear is installed at the inner axial end of one of the flanges; the output motor is a permanent magnet motor and is mounted on a motor base on the side of the cylinder; the coupling is an elastic pin coupling, and the output shaft of the permanent magnet motor is connected to the pinion gear assembly through the elastic pin coupling; the pinion gear assembly includes at least a pinion gear meshing with the large gear; the permanent magnet motor can drive the pinion gear to rotate, thereby driving the large gear and the cylinder to rotate.

[0007] Preferably, the pinion device includes a connecting shaft and a pinion mounted on the connecting shaft; the elastic pin coupling forms a first connecting cavity and a second connecting cavity, the output shaft of the permanent magnet motor is interference-fitted into the first connecting cavity, one end of the connecting shaft is interference-fitted into the second connecting cavity, at least one first keyway is correspondingly opened on the inner wall of the output shaft of the permanent magnet motor and the first connecting cavity, and a first flat key is adapted to be provided in the first keyway on both sides; at least one second keyway is correspondingly opened on the inner wall of the connecting shaft and the second connecting cavity, and a second flat key is adapted to be provided in the second keyway on both sides.

[0008] Preferably, the elastic pin coupling has a gap formed between the first connecting cavity and the second connecting cavity.

[0009] Preferably, the pinion is a helical gear.

[0010] Preferably, the pinion device further includes bearing housings mounted on the connecting shaft and located on both sides of the pinion, wherein the bearings in the bearing housings are self-aligning roller bearings.

[0011] Preferably, the large gear is a hollow gear structure.

[0012] Preferably, the large gear includes two semi-circular tooth segments that fit together and are connected to a flange on the cylinder via a reamed hole bolt.

[0013] Preferably, the large gear is made of ZG42CrMo alloy steel.

[0014] The present invention adopts the above technical solution and has the following beneficial effects:

[0015] ① The output motor in the above scheme uses a permanent magnet motor. Permanent magnet motors have no excitation losses and an efficiency of over 95% (compared to 85%~90% for traditional asynchronous motors), significantly reducing energy consumption. The starting torque of a permanent magnet motor can reach 2~3 times its rated torque, easily overcoming the high inertial load during rod mill startup and avoiding stalling or tripping problems. Furthermore, its instantaneous overload capacity reaches 150%~200%, adapting to fluctuations in operating conditions such as sudden changes in ore hardness.

[0016] ② The output shaft of the permanent magnet motor is connected to the pinion gear via a flexible pin coupling. The pins of the flexible pin coupling are elastic elements that can absorb the impact loads and instantaneous vibrations of the rod mill cylinder, protecting the motor shaft and transmission system. The flexible pin coupling allows for angular deviations of ±0.5° to ±1° and radial deviations of 1 to 3 mm, reducing installation accuracy requirements and preventing coupling failure due to foundation settlement or thermal deformation. Its dynamic compensation capability can adapt to slight deformations during long-term operation of the rod mill.

[0017] ③ The large gear adopts a hollow gear structure to reduce gear weight. Furthermore, the large gear is made of ZG42CrMo alloy steel, which has high bending strength and fatigue limit, and can withstand the impact load of steel bars and materials when the cylinder rotates.

[0018] ④ The large gear is installed in a split configuration, consisting of two parts that are connected to the cylinder flange via reamed bolt holes, facilitating transportation and on-site assembly.

[0019] ⑤ The bearing housing on the pinion device is used to support the pinion device, and the self-aligning roller bearing inside can withstand the radial load from the large gear.

[0020] ⑥ The pinion uses helical gears to transmit motion, resulting in smooth transmission, low noise, high overlap, and strong load-bearing capacity. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the arrangement of the transmission structure on a wet rod mill.

[0022] Figure 2 This is a schematic diagram of the installation of a permanent magnet motor and a pinion gear assembly.

[0023] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure.

[0024] Figure 4 This is a schematic diagram showing the connection between a permanent magnet motor and a flexible pin coupling.

[0025] Figure 5 This is a three-dimensional structural diagram of the pinion device.

[0026] Figure 6 This is a schematic diagram of the assembly of the pinion and the gear. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] like Figures 1-6The transmission structure of a wet rod mill shown includes an output motor 1, a coupling, a pinion gear assembly, a large gear 2, and a cylinder 3. Flanges 4 are provided at both axial ends of the cylinder 3, and the large gear 2 is installed at the inner axial end of one of the flanges 4. The output motor 1 is a permanent magnet motor and is mounted on a motor base 5 on the side of the cylinder 3. The coupling is a flexible pin coupling 6. The output shaft 9 of the permanent magnet motor is connected to the pinion gear assembly through the flexible pin coupling 6. The pinion gear assembly includes at least a pinion 7 that meshes with the large gear 2. The permanent magnet motor can drive the pinion 7 to rotate, thereby rotating the large gear 2 and the cylinder 3.

[0033] In the above technical solution, the permanent magnet motor is connected to the pinion gear device through a flexible pinion coupling, which drives the pinion gear to rotate, thereby driving the large gear and the cylinder to rotate. The permanent magnet motor has no excitation loss and its efficiency can reach over 95% (compared to 85%~90% for traditional asynchronous motors), significantly reducing energy consumption. Variable frequency speed control precisely matches load requirements, avoiding energy waste caused by over-powered motors, resulting in a comprehensive energy saving rate of 10%~20%. The starting torque of the permanent magnet motor can reach 2~3 times the rated torque, easily overcoming the high inertia load during rod mill startup and avoiding stalling or tripping problems. Instantaneous overload capacity reaches 150%~200%, adapting to fluctuations in operating conditions such as sudden changes in ore hardness. With no brushes or gear wear, only periodic checks of the bearings and permanent magnets are required, extending the maintenance cycle by 2~3 times. The dust-resistant design (IP54 or higher protection level) adapts to harsh operating conditions, reducing the failure rate caused by dust intrusion.

[0034] The output shaft of the permanent magnet motor is connected to the pinion gear via a flexible pin coupling. The pins of the flexible pin coupling are elastic elements that can absorb the impact loads and instantaneous vibrations of the rod mill cylinder, protecting the motor shaft and transmission system. This reduces the vibration amplitude transmitted to the motor by 40% to 60%, extending the life of the motor bearings.

[0035] The permanent magnet motor achieves stepless speed regulation through a frequency converter, and combined with the flexible transmission of the elastic coupling, it can quickly respond to load changes (such as fluctuations in ore filling rate). The speed control accuracy reaches ±0.1%, optimizing grinding efficiency and product particle size distribution.

[0036] Furthermore, the pinion device includes a connecting shaft 8 and a pinion 7 mounted on the connecting shaft 8; the elastic pin coupling 6 forms a first connecting cavity and a second connecting cavity, the output shaft 9 of the permanent magnet motor is interference-fitted into the first connecting cavity, one end of the connecting shaft 8 is interference-fitted into the second connecting cavity, at least one first keyway 10 is correspondingly formed on the inner wall of the first connecting cavity of the output shaft 9 of the permanent magnet motor, and first flat keys are adapted to fit within the first keyways 10 on both sides; at least one second keyway 11 is correspondingly formed on the inner wall of the second connecting cavity of the connecting shaft 8, and second flat keys are adapted to fit within the second keyways 11 on both sides. In this technical solution, the elastic pin coupling is interference-fitted with the shafts on both sides and then connected by flat keys, resulting in a stable and simple structure that is easy to maintain.

[0037] Furthermore, a gap 12 is formed within the elastic pin coupling 6 between the first connecting cavity and the second connecting cavity. In this technical solution, the gap can compensate for the displacement of the two shafts in the axial direction, and the presence of this gap can prevent coupling failure due to axial expansion or contraction.

[0038] Furthermore, the pinion 7 is a helical gear. In this technical solution, the pinion uses a helical gear to transmit motion, resulting in smooth transmission, low noise, high overlap, and strong load-bearing capacity.

[0039] Furthermore, the pinion device also includes bearing housings 13 mounted on the connecting shaft 8 and located on both sides of the pinion 7, wherein the bearings within the bearing housings 13 are self-aligning roller bearings. In this technical solution, the bearing housings on the pinion device are used to support the pinion device, and the self-aligning roller bearings within them can withstand radial loads from the large gear.

[0040] Furthermore, the large gear 2 is a hollow gear structure. In this technical solution, the large gear adopts a hollow gear structure, which reduces the gear weight.

[0041] Furthermore, the large gear 2 includes two semi-circular tooth segments that fit together and are connected to the flange 4 on the cylinder 3 via reamed hole bolts. In this technical solution, the large gear is installed in a split manner, consisting of two segments, which are connected to the cylinder flange via reamed hole bolts, facilitating transportation and on-site assembly.

[0042] Furthermore, the large gear 2 is made of ZG42CrMo alloy steel. In this technical solution, the large gear is made of ZG42CrMo alloy steel, which has high bending strength and fatigue limit, and can withstand the impact load of the steel bar and the material when the cylinder rotates.

[0043] In this specific embodiment, the existing traditional motor + air clutch solution suffers from problems such as high transmission cost, complex maintenance, energy loss, and environmental adaptability. The above-mentioned permanent magnet motor + flexible pin coupling provides torque to drive the rod mill cylinder to rotate, which significantly reduces power consumption, easily overcomes the high inertial load during rod mill startup, and absorbs the impact load and instantaneous vibration of the rod mill cylinder through the flexible pin coupling, protecting the motor shaft and transmission system and extending the life of the motor bearings.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A transmission structure for a wet rod mill, characterized in that: The device includes an output motor (1), a coupling, a pinion gear assembly, a large gear (2), and a cylinder (3). The cylinder (3) has flanges (4) at both axial ends, and the large gear (2) is installed on the inner axial end of one of the flanges (4). The output motor (1) is a permanent magnet motor and is mounted on a motor base (5) on the side of the cylinder (3). The coupling is an elastic pin coupling (6). The output shaft (9) of the permanent magnet motor is connected to the pinion gear assembly through the elastic pin coupling (6). The pinion gear assembly includes at least a pinion gear (7) that meshes with the large gear (2). The permanent magnet motor can drive the pinion gear (7) to rotate, thereby driving the large gear (2) and the cylinder (3) to rotate.

2. The transmission structure of a wet rod mill according to claim 1, characterized in that: The pinion device includes a connecting shaft (8) and a pinion (7) mounted on the connecting shaft (8); a first connecting cavity and a second connecting cavity are formed in the elastic pin coupling (6); the output shaft (9) of the permanent magnet motor is interference-fitted in the first connecting cavity, and one end of the connecting shaft (8) is interference-fitted in the second connecting cavity; at least one first keyway (10) is correspondingly opened on the inner wall of the first connecting cavity and the output shaft (9) of the permanent magnet motor; a first flat key is adapted to be provided in the first keyway (10) on both sides; at least one second keyway (11) is correspondingly opened on the inner wall of the connecting shaft (8) and the second connecting cavity; a second flat key is adapted to be provided in the second keyway (11) on both sides.

3. The transmission structure of a wet rod mill according to claim 2, characterized in that: The elastic pin coupling (6) has a gap (12) formed between the first connecting cavity and the second connecting cavity.

4. The transmission structure of a wet rod mill according to claim 2, characterized in that: The pinion (7) is a helical gear.

5. The transmission structure of a wet rod mill according to claim 2, characterized in that: The pinion device also includes bearing seats (13) mounted on the connecting shaft (8) and located on both sides of the pinion (7), wherein the bearings in the bearing seats (13) are self-aligning roller bearings.

6. The transmission structure of a wet rod mill according to claim 1, characterized in that: The large gear (2) is a hollow gear structure.

7. The transmission structure of a wet rod mill according to claim 6, characterized in that: The large gear (2) includes two semi-circular tooth segments that fit together and are connected to the flange (4) on the cylinder (3) by bolts with hinge holes.

8. The transmission structure of a wet rod mill according to claim 6, characterized in that: The large gear (2) is made of ZG42CrMo alloy steel.

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