A ball mill grinding table speed reducer connecting device

Abstract

The application relates to a connecting device of a ball mill grinding disc speed reducer, which comprises an input shaft, a small bevel gear, a large bevel gear, an intermediate shaft, a planetary shaft, a planetary gear carrier, an inner gear ring, a speed reducer shell, a thrust bearing, an output shaft, an inner tooth flange, a flange outer tooth, an outer tooth flange and a labyrinth seal. When the speed reducer input shaft rotates, the intermediate shaft is driven to rotate through the meshing between the small bevel gear and the large bevel gear. The gear on the intermediate shaft meshes with the planetary gears on the planetary gear carrier, so that the planetary gear carrier rotates along the inner gear ring. The planetary gear carrier drives the output shaft to rotate, and the output shaft is connected with the outer tooth flange through connecting bolts and shaft pins in the horizontal and axial directions, so that the outer tooth flange rotates along the center of the output shaft. The outer tooth flange meshes with the inner tooth flange through a pair of intermediate gear rings, and the outer tooth flange is horizontally supported on the speed reducer shell through 12 circumferential thrust bearings, so that the outer tooth flange rotates. The outer tooth flange is horizontally positioned with the grinding disc through a positioning pin, the grinding disc is arranged on the outer tooth flange, and synchronous rotation of the grinding disc and the outer tooth flange is realized.

Description

Technical Field

[0001] This invention relates to a connecting device, specifically a ball mill grinding disc and reducer connecting device, and to a mechanical structure for reliable torque transmission between the grinding disc and reducer of a ball mill used for blast furnace pulverized coal injection, belonging to the technical field of ironmaking equipment. Background Technology

[0002] Pulverized coal injection (PCI) in blast furnaces is a crucial technology in modern blast furnace smelting. PCI involves injecting finely ground coal powder directly into the blast furnace via a specialized injection system during the iron and steel smelting process, replacing a portion of the coke as a reducing agent and fuel. The main objectives are to reduce reliance on high-quality coke resources, lower ironmaking costs, improve blast furnace smelting conditions, and enhance smelting efficiency and economic benefits. It also reduces pig iron costs by partially replacing expensive metallurgical coke with inexpensive pulverized coal and serves as an effective means of adjusting furnace thermal regimes.

[0003] The ball mill for pulverized coal injection uses a high-power motor that drives the cylinder to rotate via a gearbox. Steel balls inside the cylinder are lifted to a certain height and then fall. The coal is ground through the impact of the steel balls on the coal lumps and the grinding action between the steel balls and between the steel balls and the guard plates. Excessively coarse pulverized coal is separated by a coarse powder separator at the rear of the ball mill and returned to the cylinder for further grinding via a return pipe. The ball mill grinds raw coal into pulverized coal that meets the requirements for blast furnace injection, controlling the particle size and fineness of the pulverized coal to ensure complete combustion within the blast furnace, thus improving the efficiency and utilization rate of pulverized coal injection.

[0004] The reducer's adapter flange rotates with the planetary gear carrier drive shaft and is fixed by eight Φ60×160 shaft pins, which simultaneously transmit the reducer's entire output rotational torque.

[0005] The manufacturer designed the eight pins and pin holes to have a small interference fit of 0 to +0.03 mm. During operation, there is always vertical axial displacement between the eight pins and pin holes. Due to the 0 to +0.03 mm fit, the pins and pin holes are constantly subjected to dry friction and compression, leading to continuous wear and deformation. This creates an abnormally weak link in the reducer. With prolonged use, the connection between the pins and pin holes will fail, and in severe cases, it can cause the planetary gear carrier drive shaft to crack and break.

[0006] To improve the reliability of the speed reducer, the connection between the adapter flange and the planetary gear carrier drive shaft needs to be optimized. The following optimization approach is proposed:

[0007] The adapter flange is reinforced with auxiliary support rollers and gears to withstand radial impacts. This ensures that the turntable does not experience radial displacement during rotation. The eight pins and pin holes are fitted with a tight fit, transmitting only torque and not bearing radial or axial impact loads. Summary of the Invention

[0008] This invention addresses the technical problems existing in the prior art by providing a control technology for abnormal ultra-low emissions of pollutants from lime kilns. The technical solution is to provide a connecting device between a transition flange and the output shaft of a reducer. This technical solution can effectively solve the problem of ball mill failure caused by the failure of the connection between the reducer and the flange.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows: a flange and reducer output shaft connection device, the connection device including a planetary gear reducer, flange internal gears, flange external gears, guide rollers, positioning pins, connecting bolts, shaft pins, and thrust bearings. The planetary gear reducer includes an input shaft, bevel gears, an intermediate shaft, a sun gear, a planetary gear carrier, an internal gear ring, and a reducer housing. A motor drives the reducer input shaft, the input shaft drives the intermediate shaft through a pair of bevel gears meshing, the sun gear on the intermediate shaft meshes with the planetary gears, the planetary gear carrier drives the reducer output shaft to rotate, the output shaft is tightly connected to the external gear flange through connecting bolts and shaft pins, the external gear flange meshes with the internal gears to transmit torque, and the internal gear flange drives the upper grinding disc to rotate through positioning pins and guide rollers.

[0010] As an improvement of the present invention, six guide rollers are added around the grinding disc. During operation, the gap between the guide rollers and the grinding disc is adjusted to the allowable range according to the wear of the guide rollers to withstand the horizontal impact during the rotation of the grinding disc.

[0011] As an improvement to this invention, the original flange is decomposed into an external toothed flange and an internal toothed flange, replacing the function of the original shaft pin device. This allows for torque transmission while preventing wear and deformation of the shaft pin and pin hole due to continuous wear and compression. The external and internal toothed flanges are connected by internal and external teeth. When the internal toothed flange rotates, the gear meshing drives the external toothed flange to rotate around the center. Simultaneously, due to the gear clearance, the internal toothed flange is prevented from bearing radial force; it only transmits torque. This creates an abnormally weak link in the reducer. With prolonged use, the connection between the shaft pin and pin hole fails, potentially leading to cracking and breakage of the planetary gear carrier drive shaft.

[0012] The ball mill grinding disc reducer connection device operates as follows: The motor inputs torque via the input shaft. The input shaft drives the intermediate shaft to rotate via paired meshing bevel gears. The intermediate shaft meshes with three planetary gears on the planetary carrier via an intermediate gear, causing the planetary carrier to rotate along the internal gear ring, which in turn drives the upper output shaft of the planetary carrier to rotate. The upper output shaft of the planetary carrier is axially and bolted to the external gear flange. The shaft pins provide axial positioning, and the bolts provide vertical and horizontal fastening. The external gear flange, through the meshing of its internal and external gears, drives the outer circumference of the internal gear flange to rotate. Under the vertical and horizontal positioning of the thrust bearing and guide rollers, the internal gear flange is held in place by eight positioning pins, causing the upper grinding disc to rotate along the output shaft.

[0013] Compared to existing technologies, this invention has the following advantages: When applied to the connection structure between the grinding disc and the reducer output shaft of a ball mill, calculations, analysis, and field practice have shown that the structural resistance is low, and the overall structure operates safely and stably. This invention has a reliable structure and can be widely used in the connection devices between the grinding disc and reducer in ball mills both domestically and internationally. It has high practical value and broad application prospects for ensuring the safe and stable operation of blast furnace pulverized coal injection production, eliminating safety hazards, and reducing maintenance costs and time. It can reduce on-site failures of shaft pin and pin hole connections, and reduce cracking and breakage of the planetary gear drive shaft. It extends the overall lifespan of the ball mill. The use of internal and external gear meshing + guide rollers for circumferential positioning of the grinding disc avoids radial and axial forces generated during rotation. The optimized structure transmits only torque between the reducer and the grinding disc, effectively extending the lifespan of the connection structure between the grinding disc and the reducer. This reduces equipment downtime and increases equipment operational reliability. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is another sectional view of the present invention.

[0016] In the diagram: 1. Input shaft, 2. Small bevel gear, 3. Large bevel gear, 4. Intermediate shaft, 5. Planetary shaft, 6. Planetary gear carrier, 7. Internal gear ring, 8. Reducer housing, 9. Thrust shaft, 10. Output shaft, 11. Internal gear flange, 12. External gear flange, 13. Guide roller, 14. Locating pin, 15. Connecting bolt, 16. Shaft pin, 17. External gear flange, 18. Labyrinth seal. Detailed Implementation

[0017] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0018] Example 1: See Figure 1A ball mill grinding disc and reducer connection device is disclosed. The connection device includes an input shaft 1, a small bevel gear 2, a large bevel gear 3, an intermediate shaft 4, a planetary shaft 5, a planetary gear carrier 6, an internal gear ring 7, a reducer housing 8, a thrust bearing 9, an output shaft 10, an internal gear flange 11, an external gear flange 12, a guide roller 13, a positioning pin 14, a connecting bolt 15, a shaft pin 16, an external gear flange 17, and a labyrinth seal 18. When the reducer input shaft 1 operates, the meshing between the small bevel gear 2 and the large bevel gear 3 drives the intermediate shaft 4 to rotate. The gear on the intermediate shaft 4 meshes with the planetary gears on the planetary gear carrier 6, driving the planetary gear carrier 6 to rotate circumferentially around the internal gear ring 7. The planetary gear carrier 6 drives the output shaft 10 to rotate. The output shaft 10 and the external gear flange 17 are connected horizontally and axially by connecting bolts and shaft pins, thereby driving the external gear flange 17 to rotate around the center of the output shaft 10. The external gear flange 17 and the internal gear flange 11 are engaged by a pair of gear rings in the middle. The external gear flange 17 is horizontally supported on the reducer housing 8 by 12 circumferential thrust bearings 9, thereby driving the external gear flange 17 to rotate. The external gear flange is horizontally positioned with the grinding disc by 8 locating pins. The grinding disc is placed on the external gear flange 17, realizing synchronous rotation between the grinding disc and the external gear flange 17.

[0019] Working principle and process: A ball mill grinding disc and reducer connection device, the connection device performs the following functions: The rotation of the motor drives the input shaft 1 to rotate, and the large and small bevel gears 23 drive the intermediate shaft 4 to rotate. The intermediate shaft drives the planetary gear carrier 6 to rotate circumferentially along the internal gear ring 7 through planetary gear transmission. The planetary gear carrier 6 is installed as an integral part of the output shaft 10, thereby driving the output shaft 10 to rotate. During the rotation of the output shaft, the internal gear flange 11 and the external gear flange 17 rotate together, thereby driving the upper grinding disc to rotate, realizing the rotation of the ball mill grinding disc driven by the motor through the reducer.

[0020] The connecting device replaces the original integral flange with an internal toothed flange 11 and an external toothed flange 17, and adds guide rollers 13 around the grinding disc. This avoids abnormal damage to the internal shaft pins and pin holes of the flange during torque transmission. The integral flange is replaced with a separate connection of internal toothed flange 11 and external toothed flange 17, so the engagement between the shaft pin and the hole is no longer subjected to horizontal impact during operation. The addition of guide rollers around the grinding disc reduces circumferential impact during grinding disc rotation. The separate flange and guide rollers prevent abnormal damage to the shaft pins and pin holes, which could lead to the failure of the ball mill reducer output shaft and subsequent shutdown.

[0021] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A ball mill grinding disc reducer connection device, characterized in that, The connecting device includes a planetary gear reducer, flange internal gears, flange external gears, guide rollers, positioning pins, connecting bolts, shaft pins, and thrust bearings. The planetary gear reducer includes an input shaft, bevel gears, an intermediate shaft, a sun gear, a planetary gear carrier, an internal gear ring, and a reducer housing. When the reducer input shaft rotates, the input shaft drives the intermediate shaft through a pair of bevel gears meshing. The sun gear on the intermediate shaft meshes with the planetary gears, and the planetary gear carrier drives the reducer output shaft to rotate. The output shaft is tightly connected to the external gear flange through connecting bolts and shaft pins. The external gear flange meshes with the internal gear flange to transmit torque. The internal gear flange drives the upper grinding disc to rotate around the rotation center through positioning pins and guide rollers. The external gear flange is positioned horizontally with the grinding disc through positioning pins, and the grinding disc is placed on the external gear flange.

2. The ball mill grinding disc reducer connecting device according to claim 1, characterized in that, Six guide rollers are added around the grinding disc. During operation, the gap between the guide rollers and the grinding disc is adjusted to the allowable range according to the wear of the guide rollers, so as to withstand the horizontal impact during the rotation of the grinding disc.

3. The ball mill grinding disc reducer connecting device according to claim 1, characterized in that, The external toothed flange and the internal toothed flange are connected by the internal and external teeth. When the internal toothed flange rotates, it drives the external toothed flange to rotate around the center through gear meshing.

4. The ball mill grinding disc reducer connecting device according to claim 1, characterized in that, The device also includes a labyrinth seal, which uses an upper moving part and a lower stationary part, with grooves machined in corresponding circumferential directions. When the upper moving part rotates, the upper and lower grooves divide the gap between the upper and lower parts into small gaps in the vertical direction.

5. The ball mill grinding disc reducer connecting device according to claim 1, characterized in that, The planetary gear carrier is integrated with the output shaft mounting position, driving the output shaft to rotate.

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