A drum gear coupling for a roller table in front of a heating furnace

Abstract

The utility model discloses a kind of heating furnace front roller drum gear coupling, including the first outer tooth shaft sleeve and the second outer tooth shaft sleeve of pair arrangement, and the first inner tooth ring and the second inner tooth ring of pair arrangement, first outer tooth shaft sleeve and the second outer tooth shaft sleeve are respectively with the first inner tooth ring and the second inner tooth ring corresponding engagement, first inner tooth ring and the second inner tooth ring are fixed by bolt, to connect first outer tooth shaft sleeve and the second outer tooth shaft sleeve, the side of first inner tooth ring and the second inner tooth ring adhesion is respectively equipped with first flange and second flange, recess structure is equipped on one of first flange and second flange, convex structure is equipped on the other, convex structure extends into recess structure, two are matched and clamped, form the clamping form of male and female stop, greatly enhance the stability and rigidity of two inner tooth ring connection, can effectively resist misplacement and deformation, and share a part of the torque transmitted by bolt.

Description

Technical Field

[0001] This utility model relates to the field of coupling technology, and in particular to a drum-shaped gear coupling for a front roller conveyor of a heating furnace. Background Technology

[0002] Drum gear couplings are common components in mechanical structures, used to connect two shafts (driving shaft and driven shaft) in different mechanisms, enabling them to rotate together and transmit torque. They also provide angular compensation for relative misalignment between the two shafts. Drum gear couplings are characterized by small radial dimensions, high load-bearing capacity, high transmission efficiency, low noise, and long maintenance cycles. They are widely used in metallurgy, mining, hoisting and transportation industries, and are also suitable for shaft transmission in various types of machinery, including petroleum, chemical, and general machinery.

[0003] Patent application CN201129371Y discloses a drum-shaped gear coupling, including external gear sleeves at driving and driven ends, which are connected to an internal gear ring via tooth profiles. End caps are provided at both ends of the internal gear ring. Sealing rings are respectively provided between the end caps, the external gear sleeves, and the internal gear ring. The end caps are split and connected as a single unit by end cap connecting bolts. The external gear sleeves are splined to the shaft.

[0004] However, when the drum-shaped gear coupling disclosed in the above patent is applied to specific harsh working conditions such as the roller conveyor in front of the heating furnace of the rolling mill, the working conditions require frequent start-stop and huge impact loads. The teeth of the traditional coupling are prone to damage. The severe vibration transmitted by the roller conveyor may cause fatigue tearing of the thin-walled internal gear ring in the traditional coupling. Utility Model Content

[0005] Therefore, it is necessary to provide a drum-shaped gear coupling for the front roller conveyor of the heating furnace to address the above problems.

[0006] This application provides a drum-shaped gear coupling for a front roller conveyor of a heating furnace, including a pair of first external gear bushings and second external gear bushings, and a pair of first internal gear rings and second internal gear rings. The first and second external gear bushings respectively mesh with the first and second internal gear rings, and the first and second internal gear rings are fixed by bolts to connect the first and second external gear bushings.

[0007] The first internal gear ring and the second internal gear ring are respectively provided on the side where they fit together. One of the first flange and the second flange is provided with a groove structure, and the other flange is provided with a protrusion structure. The protrusion structure extends into the groove structure, and the two are engaged and snapped together.

[0008] Optionally, it also includes a first cover and a second cover arranged in pairs, wherein the first cover is bolted to the first internal gear ring to form a first receiving groove suitable for receiving the sealing ring, and the second cover is bolted to the second internal gear ring to form a second receiving groove suitable for receiving the sealing ring.

[0009] Optionally, the first flange and the second flange are connected by M14 / M16 reamed bolts.

[0010] Optionally, a nitrided hardened layer is formed on the tooth surfaces of the first and second internal gear rings.

[0011] Optionally, a nitrided hardened layer is formed on the tooth surfaces of the first and second external gear bushings.

[0012] Optionally, the wall thickness of the first internal gear ring and the second internal gear ring is 10-12 mm.

[0013] Optionally, the gap between the tooth end face of the first external gear bushing and the inner wall of the first internal gear ring is 8-10 mm.

[0014] The gap between the tooth end face of the second external gear bushing and the inner wall of the second internal gear ring is 8-10 mm.

[0015] Optionally, the first and second internal gear rings are provided with oil injection nozzles.

[0016] Optionally, the oil nozzle is a funnel-shaped oil nozzle.

[0017] Compared with the prior art, the technical solution provided in this application has the following advantages:

[0018] The aforementioned drum-shaped gear coupling for the heating furnace front roller conveyor features a grooved structure on one flange and a mating protrusion on the other, forming a male-female snap-fit ​​connection. The tight fit between the protrusion and the groove provides precise radial positioning, significantly enhancing the stability and rigidity of the connection between the two internal gear rings. When this coupling is subjected to the impact of frequent starts and stops on the heating furnace front roller conveyor and the severe vibrations generated by the roller conveyor itself, the structure effectively resists misalignment and deformation, ensuring the overall concentricity and smooth operation of the coupling.

[0019] Secondly, this structure can share some of the torque transmitted through the bolts. When transmitting large torques, the shear force is borne not only by the bolts but also by the sidewalls of the raised and recessed structures. This enhances the overall torque-carrying capacity of the coupling and reduces the risk of the connecting bolts being sheared.

[0020] Finally, this male and female stop fit can effectively cope with the positional error caused by corrosion and wear of the equipment base after long-term use. Through its rigid connection and precise positioning, it prevents gaps between the flange connection surfaces and ensures the reliability of the coupling in long-term operation. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the existing roller conveyor drum-shaped gear coupling for the heating furnace.

[0022] Figure 2 A schematic diagram of the overall structure of the drum-shaped gear coupling for the front roller conveyor of the heating furnace provided in an embodiment of this application;

[0023] Figure 3 Left view of a drum-shaped gear coupling for a heating furnace front roller conveyor provided in an embodiment of this application;

[0024] Figure 4 A schematic diagram of the internal gear ring clearance structure of a drum-shaped gear coupling for a heating furnace front conveyor provided in an embodiment of this application;

[0025] Figure 5 A schematic diagram of the internal gear ring wall thickness structure of the drum-shaped gear coupling in front of the heating furnace provided in one embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. First external gear bushing; 2. Second external gear bushing; 3. First internal gear ring; 4. Second internal gear ring; 5. First flange; 6. Second flange; 7. First gland; 8. Second gland; 9. Oil filler nozzle. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] See Figure 2 An embodiment of this utility model provides a drum-shaped gear coupling for a front roller conveyor of a heating furnace, including a first external gear bushing 1 and a second external gear bushing 2 arranged in pairs, and a first internal gear ring 3 and a second internal gear ring 4 arranged in pairs. The first external gear bushing 1 and the second external gear bushing 2 respectively mesh with the first internal gear ring 3 and the second internal gear ring 4. The first internal gear ring 3 and the second internal gear ring 4 are fixed by bolts to connect the first external gear bushing 1 and the second external gear bushing 2.

[0030] The first internal gear ring 3 and the second internal gear ring 4 are respectively provided with a first flange 5 and a second flange 6 on the side where they fit together. One of the first flange 5 and the second flange 6 is provided with a groove structure, and the other is provided with a protrusion structure. The protrusion structure extends into the groove structure, and the two are engaged and snapped together.

[0031] In this embodiment, one flange has a groove structure, and the other flange has a matching protrusion structure. Together, they form a male-female snap-fit ​​connection. The tight fit between the protrusion and the groove provides precise radial positioning, greatly enhancing the stability and rigidity of the connection between the two internal gear rings. When the coupling is subjected to the impact of frequent starts and stops on the roller conveyor in front of the heating furnace, as well as the severe vibrations generated by the roller conveyor itself, the above structure effectively resists misalignment and deformation, ensuring the overall concentricity and smooth operation of the coupling.

[0032] Secondly, this structure can share some of the torque transmitted through the bolts. When transmitting large torques, the shear force is borne not only by the bolts but also by the sidewalls of the raised and recessed structures. This enhances the overall torque-carrying capacity of the coupling and reduces the risk of the connecting bolts being sheared.

[0033] Finally, this male and female stop fit can effectively cope with the positional error caused by corrosion and wear of the equipment base after long-term use. Through its rigid connection and precise positioning, it prevents gaps between the flange connection surfaces and ensures the reliability of the coupling in long-term operation.

[0034] Therefore, compared to Figure 1 The coupling shown, under the same operating conditions, reduces the probability of tooth damage in the drum-shaped gear coupling of this utility model by about 2%.

[0035] In one embodiment, the device further includes a first cover 7 and a second cover 8 arranged in pairs. The first cover 7 is bolted to the first internal gear ring 3 to form a first receiving groove suitable for accommodating the sealing ring. The second cover 8 is bolted to the second internal gear ring 4 to form a second receiving groove suitable for accommodating the sealing ring.

[0036] This embodiment introduces a separate design for the internal gear ring and the gland, where the gland is detachably connected to the internal gear ring via bolts, together forming a receiving groove for accommodating the sealing ring. This structure is an optimization addressing the problems of difficult maintenance and long repair times in existing couplings. In traditional integrated structures, replacing the sealing ring often requires removing the entire coupling from the shaft, involving complex disassembly. With this separate design, maintenance personnel do not need to disassemble the main coupling body; they can easily remove and replace aged or damaged sealing rings simply by removing the connecting bolts of the gland online. This improvement is particularly important for applications such as the roller conveyor before the heating furnace, where there are many couplings and their arrangement is close together. It significantly reduces the labor intensity and technical difficulty of maintenance work, reduces production line downtime caused by replacing vulnerable parts, and thus effectively improves the overall utilization rate and production efficiency of the equipment.

[0037] In one embodiment, the first flange 5 and the second flange 6 are connected by M14 / M16 reamed bolts, providing substantial preload and clamping force. The reamed bolts are characterized by a high-precision, tight fit between the bolt shank and the bore wall, with virtually no clearance. This structure allows the bolt to transmit torque not only through friction between the flange contact surfaces but also by the bolt shank itself directly bearing shear force. This dual-action mechanism significantly enhances the reliability of the connection and the limit of torque transmission, effectively coping with the enormous impact loads caused by frequent start-ups and shutdowns of the roller conveyor in front of the heating furnace. Furthermore, the high-precision fit of the reamed bolts also ensures accurate positioning, preventing relative slippage of the flanges under high-intensity vibration, thus guaranteeing the long-term alignment accuracy and operational stability of the coupling and avoiding the possibility of gaps between the flanges.

[0038] In one embodiment, the teeth of the first internal gear ring 3 and the second internal gear ring 4 are subjected to a nitriding process. This embodiment clarifies that the teeth of the first internal gear ring 3 and the second internal gear ring 4 are treated with a nitriding process, which is a direct means of improving the core performance and lifespan of the coupling. Nitriding is a surface chemical heat treatment process that can form a compound layer and diffusion layer with extremely high hardness on the gear surface. The main technical effect of this process is that it significantly enhances the wear resistance and fatigue strength of the teeth. Under harsh operating conditions of frequent start-stop and high impact on the roller conveyor in front of the heating furnace, the meshing surfaces of the internal and external teeth of the coupling are prone to wear, scratches, and even peeling, i.e., "tooth breakage". After nitriding treatment, the surface hardness of the teeth is greatly improved, which can effectively resist this wear and maintain the integrity and accuracy of the tooth profile. In addition, the compressive stress generated by the nitriding layer can offset some of the tensile stress during operation, thereby improving the fatigue strength of the tooth root and delaying the initiation and propagation of fatigue cracks. This not only directly solves the problem of easy tooth breakage, but also indirectly achieves the goal of increasing the torque of the coupling by improving the tooth surface contact strength, because higher surface load-bearing capacity means that greater torque can be transmitted. Ultimately, the application of this technology effectively extended the overall service life of the coupling.

[0039] In one embodiment, the teeth of the first external gear sleeve 1 and the second external gear sleeve 2 are subjected to a nitriding process. This embodiment performs a nitriding process on the teeth of the first external gear sleeve 1 and the second external gear sleeve 2, a measure that complements the aforementioned nitriding treatment of the internal gear ring teeth. The technical effect is to achieve performance matching and comprehensive improvement of the entire meshing pair (i.e., internal and external teeth). By simultaneously performing surface hardening treatment on the internal and external gears, it is ensured that both meshing surfaces have extremely high hardness and excellent wear resistance, thereby maximizing the wear resistance and anti-tooth-breakage capability of the entire coupling. If only one side of the gear is treated, the untreated side will become a weak point, accelerating wear under heavy loads and impacts. Simultaneous nitriding of the internal and external teeth ensures that the entire gear pair maintains stable meshing performance and transmission accuracy during long-term operation. This comprehensive surface strengthening treatment is a necessary guarantee for achieving the overall technical goal of the coupling: transmitting higher torque, adapting to stronger impacts, and obtaining a longer overall service life.

[0040] See Figure 5 In one embodiment, the wall thickness of the first internal gear ring 3 and the second internal gear ring 4 is 10-12 mm. As mentioned in the background section, existing couplings suffer from thin internal gear ring walls due to large roller conveyor vibrations, making them prone to tearing. By increasing the wall thickness to the specific and optimized range of 10-12 mm, the structural stiffness and fatigue strength of the internal gear rings can be significantly improved. This ensures that the stress level of the coupling under severe vibration and impact loads is far below the material's fatigue limit, effectively solving the tearing problem caused by vibration, ensuring the structural integrity and operational safety of the coupling under harsh operating conditions, and extending its service life.

[0041] See Figure 4 In one embodiment, the gap between the tooth end face of the first external gear bushing 1 and the inner wall of the first internal gear ring 3 is 8-10 mm; the gap between the tooth end face of the second external gear bushing 2 and the inner wall of the second internal gear ring 4 is 8-10 mm. In this embodiment, a gap of 8-10 mm is reserved between the tooth end faces of the two external gear bushings to be connected and the corresponding inner wall of the internal gear ring. This gap setting gives the coupling a greater axial displacement compensation capability to cope with changes in installation distance during long-term operation. The roller conveyor and motor base will corrode and wear due to prolonged use, leading to increased positional errors.

[0042] This error manifests in the axial distance between the two connected shafts. By allowing a larger gap of 8-10mm, the coupling allows the external gear sleeve to float freely within this range, effectively absorbing and compensating for axial displacement caused by wear, corrosion, or thermal expansion and contraction. This not only avoids destructive additional thrust on the bearings of the motor or roller conveyor due to restricted axial displacement, but also effectively prevents gaps from forming at the internal gear ring flange connection due to the coupling being "pulled apart," ensuring the long-term stable and safe operation of the transmission system.

[0043] See Figure 2 In one embodiment, the first internal gear ring 3 and the second internal gear ring 4 are equipped with grease nipples 9, specifically funnel-shaped grease nipples. Traditional couplings typically use plug-type grease holes, requiring maintenance to first unscrew the plug with a tool, add grease, and then screw the plug back on. This process is cumbersome and prone to parts falling out or being lost in confined spaces. However, with the grease nipple 9, i.e., the funnel-shaped grease nipple, maintenance personnel can directly use the tip of a standard grease gun to apply grease to the nipple without any disassembly, completing the operation in one step. This not only significantly shortens the maintenance time of a single piece of equipment and improves work efficiency but also enhances the ease of operation for workers in compact environments, thereby ensuring that the coupling receives timely and sufficient lubrication and guarantees its long-term stable operation.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A drum-shaped gear coupling for a front roller conveyor of a heating furnace, comprising a pair of first external gear bushings (1) and second external gear bushings (2), and a pair of first internal gear rings (3) and second internal gear rings (4), wherein the first external gear bushings (1) and second external gear bushings (2) respectively mesh with the first internal gear rings (3) and second internal gear rings (4), and the first internal gear rings (3) and second internal gear rings (4) are fixed by bolts to connect the first external gear bushings (1) and second external gear bushings (2), characterized in that, The first internal gear ring (3) and the second internal gear ring (4) are respectively provided with a first flange (5) and a second flange (6) on the side where they fit together. One of the first flange (5) and the second flange (6) is provided with a groove structure, and the other is provided with a protrusion structure. The protrusion structure extends into the groove structure, and the two are engaged and snapped together.

2. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, It also includes a first pressure cap (7) and a second pressure cap (8) arranged in pairs. The first pressure cap (7) is bolted to the first internal gear ring (3) to form a first receiving groove suitable for accommodating the sealing ring. The second pressure cap (8) is bolted to the second internal gear ring (4) to form a second receiving groove suitable for accommodating the sealing ring.

3. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The first flange (5) and the second flange (6) are connected by M14 / M16 reamed bolts.

4. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The tooth surfaces of the first internal gear ring (3) and the second internal gear ring (4) are formed with a nitrided hardened layer.

5. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The tooth surfaces of the first external tooth bushing (1) and the second external tooth bushing (2) are formed with a nitrided hardened layer.

6. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The wall thickness of the first internal gear ring (3) and the second internal gear ring (4) is 10-12 mm.

7. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The gap between the tooth end face of the first external gear bushing (1) and the inner wall of the first internal gear ring (3) is 8-10 mm. The gap between the tooth end face of the second external gear bushing (2) and the inner wall of the second internal gear ring (4) is 8-10 mm.

8. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 1, characterized in that, The first internal gear ring (3) and the second internal gear ring (4) are provided with oil injection nozzles (9).

9. The drum-shaped gear coupling for the front roller conveyor of the heating furnace according to claim 8, characterized in that, The oil nozzle (9) is a funnel-shaped oil nozzle.

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