Alloy tail bearing assembly

Abstract

The utility model discloses an alloy tail bearing assembly, include: the cylindrical fixed seat is equipped with the annular flange connecting portion for with external device connection, the cylindrical alloy cover is fixed in the hole of fixed seat through high temperature sintering, the tail bearing main shaft is rotatably worn in the alloy cover inside, and the outer circumferential surface of tail bearing main shaft is processed with a plurality of keyway that extends along its axial direction and is evenly distributed in the circumference, the hard alloy strip is fixed in each keyway through high temperature sintering, so that the exposed surface of hard alloy strip and the hole surface of alloy cover jointly constitute a pair of hard alloy rotary sliding friction pair. Through adopting the hard alloy friction pair that hard alloy strip and alloy cover constitute, its wear resistance is far more than traditional bearing material, thereby greatly prolongs the service life under the harsh working condition.

Description

Technical Field

[0001] This utility model relates to the technical field of screw conveyor equipment, and in particular to an alloy tail bearing assembly. Background Technology

[0002] Currently, in equipment such as inverted screw conveyors, the tail bearing assembly commonly adopts a combination structure of deep groove ball bearings and flat bearings, relying on a front-end sealing cap for protection. This traditional structure has significant drawbacks in practical applications: First, under vertical conveying or long-term material accumulation conditions, the sealing cap is prone to wear and tear, leading to failure and loss of protective function; second, after seal failure, dust easily enters the bearing, causing not only bearing damage but also equipment dust leakage and environmental pollution; finally, under harsh conditions of high speed, continuous operation, and high wear, this structure has limited wear resistance and service life, requiring frequent maintenance and severely impacting the reliability and continuity of equipment operation. Utility Model Content

[0003] The purpose of this invention is to provide an alloy tail bearing assembly to solve the above-mentioned problems.

[0004] According to one aspect of this utility model, an alloy tail bearing assembly is provided, comprising: a cylindrical fixed seat, the outer peripheral wall of which is provided with an annular flange connection portion for connecting with external equipment; a cylindrical alloy sleeve, which is fixed in the inner hole of the fixed seat by high-temperature sintering; a tail bearing spindle, rotatably inserted inside the alloy sleeve, the outer circumferential surface of the tail bearing spindle being machined with a plurality of keyways extending axially and evenly distributed circumferentially; and a cemented carbide strip, which is fixed in each keyway of the tail bearing spindle by high-temperature sintering, such that the exposed surface of the cemented carbide strip and the inner hole surface of the alloy sleeve together form a pair of cemented carbide rotary sliding friction pairs; wherein the fixed seat, alloy sleeve, tail bearing spindle and cemented carbide strip are sintered together to form an integrated blind-plate type closed structure with an internally enclosed friction pair and no external dynamic sealing interface.

[0005] In some embodiments, the number of carbide strips is an even number between four and eight, with the specific number selected to match the diameter of the tail bearing spindle.

[0006] In some embodiments, the sintered interface between the alloy sleeve and the inner hole of the fixing seat is mechanically roughened or pre-machined with microgrooves to enhance the bonding strength and circumferential shear resistance of the two.

[0007] In some embodiments, the annular flange connection has a ring of circumferentially distributed bolt through holes for inserting fastening bolts to achieve a sealed connection with the flange of the screw conveyor housing.

[0008] In some embodiments, one end of the tail bearing spindle extends to form or is connected to a helical shaft connection end, which is provided with one of a keyed connection structure, a splined structure, or a threaded connection structure, or a flat end face for direct butt welding to the helical shaft.

[0009] In some embodiments, after the cemented carbide strip is sintered, its exposed surface and the outer cylindrical surface of the main body of the tail bearing spindle are subjected to integral precision grinding in a single clamping operation to ensure the uniformity of the gap of the cemented carbide rotary sliding friction pair.

[0010] In some embodiments, the cemented carbide material of the alloy sleeve and the material of the cemented carbide strip are selected from tungsten-cobalt or tungsten-titanium-cobalt cemented carbides, and their hardness is not lower than HRA 85.

[0011] In some embodiments, a felt cover is provided on the rear side of the fixing seat, and a felt ring is provided between the fixing seat and the felt cover.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] This application utilizes a hard alloy friction pair composed of hard alloy strips and alloy sleeves, which exhibits wear resistance far exceeding that of traditional bearing materials, thereby significantly extending its service life under harsh operating conditions. The entire structure is formed using a high-temperature sintering process to create an integrated blind-plate type closed structure, fundamentally eliminating exposed sealing interfaces and achieving complete dust sealing and zero leakage. This structure is not only wear-resistant but also adaptable to high-speed, continuous operating conditions, expanding the equipment's application range. At the same time, the structure is greatly simplified, eliminating traditional bearings and independent seals, reducing failure points, improving operational reliability, and lowering maintenance frequency and costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] refer to Figure 1This application provides an alloy tail bearing assembly, comprising: a cylindrical fixed base 1, the outer peripheral wall of which is provided with an annular flange connection portion 2 for connecting with external equipment; a cylindrical alloy sleeve 3, which is fixed in the inner hole of the fixed base 1 by high-temperature sintering; a tail bearing spindle 4, rotatably inserted inside the alloy sleeve 3, the outer circumferential surface of the tail bearing spindle 4 having multiple keyways extending axially and evenly distributed circumferentially; and a cemented carbide strip 5, which is fixed in each keyway of the tail bearing spindle 4 by high-temperature sintering, such that the exposed surface of the cemented carbide strip 5 and the inner hole surface of the alloy sleeve 3 together form a pair of cemented carbide rotary sliding friction pairs; wherein the fixed base 1, alloy sleeve 3, tail bearing spindle 4 and cemented carbide strip 5 are sintered together to form an integrated blind-plate type closed structure with an internally enclosed friction pair and no external dynamic sealing interface. The cemented carbide rotary sliding friction pair formed by the cemented carbide strip 5 and the alloy sleeve 3 completely replaces the traditional rolling bearing and sliding bearing structures. This design not only significantly improves the overall hardness and wear resistance of the bearing assembly, but also effectively withstands long-term wear under high-speed, heavy-load, and dusty conditions. The integrated blind-plate type enclosed structure uses a sintering process to metallurgically bond the various components into a whole, completely eliminating the assembly gaps and dynamic sealing surfaces between traditional bearing housings, seals, and other components. This fundamentally eliminates the possibility of dust ingress and lubricant leakage, giving the assembly true "maintenance-free and zero-leakage" characteristics. It is especially suitable for industries with extremely high sealing requirements, such as cement, mining, and grain processing.

[0017] In some embodiments, the number of carbide strips 5 is an even number between four and eight, with the specific number selected to match the diameter of the tail bearing spindle 4. The design of an even number of carbide strips 5 (four to eight) allows for flexible adaptation based on the spindle diameter. This design achieves an optimal balance between friction surface area and manufacturing cost: too few strips may result in insufficient bearing area and excessive local pressure, affecting wear resistance uniformity; too many strips increase material and processing costs and place higher demands on the consistency of the sintering process. The even-numbered symmetrical arrangement facilitates dynamic balance during spindle rotation, reduces vibration, and allows for a stepped configuration based on shaft diameter, forming a series of product solutions and enhancing the engineering applicability and economy of the assembly.

[0018] In some embodiments, the sintering interface between the alloy sleeve 3 and the inner hole of the fixing base 1 is mechanically roughened or pre-machined with microgrooves to enhance the bonding strength and circumferential shear resistance. Mechanical roughening or pre-machining of microgrooves at the sintering interface between the alloy sleeve 3 and the inner hole of the fixing base 1 significantly increases the actual contact area and mechanical interlocking effect of the metallurgical bond. This treatment not only improves the tensile strength and shear resistance of the bonding layer, preventing relative slippage or loosening under high torque or impact loads, but also improves the flow and filling effect of the molten metal during sintering, enhancing the density and reliability of the interface bonding, thereby ensuring the entire assembly maintains structural integrity and stable performance during long-term high-speed operation.

[0019] In some embodiments, the annular flange connection 2 has a ring of circumferentially distributed bolt through holes for threading fastening bolts to achieve a sealed connection with the flange of the screw conveyor housing. The ring of circumferentially distributed bolt through holes on the annular flange connection 2 allows the assembly to achieve a firm and uniform sealed connection with the equipment housing using high-strength bolts. This connection method is not only convenient to install and has good alignment, but also further eliminates dust leakage paths along the mounting surface through the sealing gasket between the flange faces, forming a double sealing guarantee. The uniformly distributed bolt force also helps to prevent the fixed seat 1 from deforming due to uneven force, ensuring the concentricity of the inner hole of the alloy sleeve 3 and the main shaft, thereby maintaining a uniform clearance and stable operation of the friction pair.

[0020] In some embodiments, one end of the tail bearing spindle 4 extends to form or connect to a helical shaft connection end. This connection end is provided with one of a keyed connection structure, a splined connection structure, or a threaded connection structure, or a flat end face for direct butt welding to the helical shaft. One end of the tail bearing spindle 4 can be designed with various connection forms, such as keyed connection, splined connection, threaded connection, or direct butt welding end face, which greatly enhances the compatibility of the assembly with helical shafts of different models and connection standards. This modular and configurable connection design allows the assembly to be flexibly applied to new equipment or the upgrading of existing equipment, improving the product's versatility and market applicability, while also simplifying the installation process and reducing users' spare parts and management costs.

[0021] In some embodiments, after sintering, the exposed surface of the cemented carbide strip 5 and the outer cylindrical surface of the tail bearing spindle 4 undergo integral precision grinding in a single clamping operation to ensure the uniformity of the clearance of the cemented carbide rotary sliding friction pair. After sintering, the cemented carbide strip 5 and the outer cylindrical surface of the tail bearing spindle 4 undergo integral precision grinding in a single clamping operation. This process ensures that the exposed surfaces of all cemented carbide strips 5 achieve extremely high coplanarity and cylindricity with the spindle base surface, making the operating clearance of the friction pair uniform in the circumferential direction. Uniform clearance not only reduces the risk of localized abnormal wear but also promotes the uniform dissipation of frictional heat, avoiding "shaft seizure" or jamming caused by uneven thermal expansion, thereby significantly improving the operational stability, reliability, and service life of the assembly.

[0022] In some embodiments, the cemented carbide material of the alloy sleeve 3 and the cemented carbide strip 5 are selected from tungsten-cobalt or tungsten-titanium-cobalt cemented carbides, with a hardness of not less than HRA 85. The alloy sleeve 3 and the cemented carbide strip 5 are made of tungsten-cobalt or tungsten-titanium-cobalt cemented carbides with a hardness of not less than HRA 85. These materials are known for their extremely high hardness, excellent wear resistance, good red hardness, and certain impact toughness. In harsh environments where high-speed rotating friction generates high temperatures and material dust causes abrasive wear, these materials ensure that the friction pair maintains stable performance over a long period, greatly extending the service life of the assembly, reducing the frequency of downtime and replacement due to wear, and significantly reducing overall operating costs.

[0023] In some embodiments, a felt cover 6 is provided on the rear side of the fixing seat 1, and a felt ring 7 is provided between the fixing seat 1 and the felt cover 6.

[0024] When the screw conveyor is running, the power from the drive end is transmitted through the screw shaft to the tail bearing main shaft 4 of this assembly, causing it to rotate. As the tail bearing main shaft 4 rotates, several hard alloy strips 5, fixed to its outer surface by a high-temperature sintering process, directly slide against the inner surface of a hard alloy sleeve 3, which is also fixed within the fixed base 1 by a sintering process. These two elements form a pair of hard alloy rotary sliding friction pairs. This friction pair directly bears the radial load generated by the screw shaft and allows for a slight axial float, thus achieving the rotational support function of the tail bearing main shaft 4 within the fixed base 1.

[0025] The key operating characteristic lies in its "built-in" and "enclosed" operating environment. Unlike traditional bearings, the core cemented carbide friction pair, which bears load and moves the load, is not exposed or relies on independent seals for protection. Instead, it is permanently encapsulated within a single, integrated metal body formed by metallurgical bonding of the fixed seat 1, alloy sleeve 3, tail bearing spindle 4, and cemented carbide strip 5. This structure creates a physical "blind plate," completely isolating the entire working interface of the friction pair from the external environment.

[0026] Therefore, during operation: No leakage path: Due to the absence of dynamic shaft seal interfaces or removable sealing surfaces, dust or materials inside the equipment cannot leak; Extremely high environmental tolerance: The inherent high hardness, high wear resistance, and good red hardness of the cemented carbide material enable the friction pair to withstand harsh working conditions caused by high-speed rotation, abrasive particles from materials, and potentially high temperatures; Stable operation: The uniform friction gap ensured by overall precision machining, and the structural integrity brought about by sintering interface strengthening treatment, together ensure the smoothness and long-term reliability of the spindle rotation.

[0027] This application utilizes a hard alloy friction pair composed of a hard alloy strip 5 and an alloy sleeve 3, which exhibits wear resistance far exceeding that of traditional bearing materials, thereby significantly extending its service life under harsh operating conditions. The entire structure is formed using a high-temperature sintering process to create an integrated blind-plate type closed structure, fundamentally eliminating exposed sealing interfaces and achieving complete dust sealing and zero leakage. This structure is not only wear-resistant but also adaptable to high-speed and continuous operating conditions, expanding the application range of the equipment. At the same time, the structure is greatly simplified, eliminating traditional bearings and independent seals, reducing failure points, improving operational reliability, and lowering maintenance frequency and costs.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An alloy tail bearing assembly, characterized in that, include: A cylindrical mounting base, wherein the outer peripheral wall of the mounting base is provided with an annular flange connection portion for connecting with external equipment; A cylindrical alloy sleeve, which is fixed in the inner hole of the fixing base by high-temperature sintering; The tail bearing spindle is rotatably inserted inside the alloy sleeve, and multiple keyways extending along its axial direction and evenly distributed circumferentially are machined on the outer circumferential surface of the tail bearing spindle. The cemented carbide strip is fixed in each keyway of the tail bearing spindle by high-temperature sintering, so that the exposed surface of the cemented carbide strip and the inner hole surface of the alloy sleeve together form a pair of cemented carbide rotary sliding friction pairs. The fixed seat, alloy sleeve, tail bearing spindle and hard alloy strip are sintered together to form an integrated blind plate-type closed structure with an internally enclosed friction pair and no external dynamic sealing interface.

2. The alloy tail bearing assembly according to claim 1, characterized in that, The number of the cemented carbide strips is an even number between four and eight, and the specific number is selected according to the diameter of the tail bearing spindle.

3. The alloy tail bearing assembly according to claim 1, characterized in that, The sintered interface between the alloy sleeve and the inner hole of the fixing seat is mechanically roughened or pre-processed with micro-grooves to enhance the bonding strength and resistance to circumferential shearing.

4. The alloy tail bearing assembly according to claim 1, characterized in that, The annular flange connection has a ring of circumferentially distributed bolt through holes for inserting fastening bolts to achieve a sealed connection with the flange of the screw conveyor housing.

5. The alloy tail bearing assembly according to claim 1, characterized in that, One end of the tail bearing spindle extends to form or is connected to a helical shaft connection end. The connection end is provided with one of the following: a key connection structure, a spline structure, or a threaded connection structure, or a flat end face for direct butt welding with the helical shaft.

6. The alloy tail bearing assembly according to claim 1, characterized in that, After the cemented carbide strip is sintered, its exposed surface and the outer cylindrical surface of the main body of the tail bearing spindle are subjected to integral precision grinding in a single clamping process to ensure the uniformity of the gap of the cemented carbide rotary sliding friction pair.

7. The alloy tail bearing assembly according to claim 1, characterized in that, The cemented carbide material of the alloy sleeve and the cemented carbide strip are selected from tungsten-cobalt or tungsten-titanium-cobalt cemented carbides, and their hardness is not lower than HRA 85.

8. The alloy tail bearing assembly according to claim 1, characterized in that, A felt cover is provided on the rear side of the fixing seat, and a felt ring is provided between the fixing seat and the felt cover.

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