Induction device for surface hardening of oil film bearings

Abstract

This utility model discloses an inductor device for surface quenching of oil film bearings, comprising multiple square tubes folded and connected in sequence, an inlet pipe connected to one end of the multiple square tubes, an outlet pipe connected to the other end of the multiple square tubes, multiple fixing plates evenly distributed on one side of the multiple square tubes, and a magnetic conductor disposed at the bottom of the multiple square tubes. The two ends of the magnetic conductor are connected to a transformer via wires. Both the inlet and outlet pipes are connected to a liquid cooling system. Compared with traditional dual-turn inductors, this device significantly reduces the width of the instantaneous heating zone and the heat-affected zone, thereby increasing the rotation angle of the annular surface quenching zone of the oil film bearing. This significantly reduces the width of the surface quenching soft band, improving the wear resistance and service life of the oil film bearing. Furthermore, the structure of multiple square tubes folded and connected in conjunction with the bottom magnetic conductor effectively optimizes the induction magnetic field. The connection of the inlet and outlet pipes to the liquid cooling system enables timely heat dissipation, ensuring the overall stable operation of the device and demonstrating good practicality.

Description

Technical Field

[0001] This utility model belongs to the field of oil film bearing quenching technology, specifically relating to an inductor device for surface quenching of oil film bearings. Background Technology

[0002] In the field of mechanical equipment, oil film bearings, as radial sliding bearings that use lubricating oil as the lubricating medium, are widely used in equipment such as rolling mills, engines, turbines, generators, and steam turbines that operate under heavy loads, high speeds, high temperatures, or special working conditions due to their significant advantages such as large load capacity, strong impact resistance, long service life, wide speed range, small structural size, and low friction coefficient. To further improve the service life of oil film bearings, the working surfaces of their components often need to undergo surface hardening treatment. By obtaining a certain depth of martensite structure on the surface while maintaining the core as tempered sorbite or pearlite structure, the performance effect of external strength and internal toughness can be achieved.

[0003] Induction heating surface hardening is a hardening method based on the principle of electromagnetic induction. It can generate an induced current on the surface of an oil film bearing assembly, which rapidly heats the surface of the oil film bearing assembly to the austenitic state. Subsequently, it is rapidly cooled to obtain a martensitic structure. In the production of surface hardening of oil film bearing assemblies, since the surface hardening surface is usually circumferential, an inductor is used to start heating at one point of the ring during production. The workpiece rotates at a constant speed on a rotating platform to achieve hardening of the entire ring surface. However, when the ring workpiece rotates one revolution, in order to prevent annealing in the surface hardened area or problems such as low hardness or cracking due to reheating and cooling, a soft strip of a certain width is reserved between the start and end positions of the surface hardening.

[0004] like Figure 1 As shown, the dual-turn inductor 300 commonly used in the surface hardening production of oil film bearing assemblies currently has the problem of a wide heating zone and heat-affected zone. Its soft strip width is A, more specifically, A is 30mm. However, with the continuous improvement of product technical requirements, the standards for controlling the soft strip width are becoming increasingly stringent. The existing dual-turn inductor 300 and the corresponding surface hardening method can hardly meet the requirements. In summary, there is an urgent need for an inductor device for surface hardening of oil film bearings. Utility Model Content

[0005] To address some or all of the technical problems existing in the prior art, this utility model provides an inductor device for surface quenching of oil film bearings. The top of the oil film bearing is an annular surface quenching zone, and the oil film bearing is connected to a rotary drive mechanism. The inductor device is fixed to one side of the quenching equipment and located at a predetermined distance above the annular surface quenching zone. The quenching equipment is equipped with a transformer and a liquid cooling system. The inductor device for surface quenching of oil film bearings includes multiple square tubes folded and connected in sequence, an inlet pipe connected to one end of the multiple square tubes, an outlet pipe connected to the other end of the multiple square tubes, multiple fixing plates evenly distributed on one side of the multiple square tubes, and a magnetic conductor disposed at the bottom of the multiple square tubes. The two ends of the magnetic conductor are connected to the transformer through wires. The inlet pipe and the outlet pipe are both connected to the liquid cooling system.

[0006] Furthermore, in the above-mentioned inductor device for surface hardening of oil film bearings, a transition plate is provided on the hardening equipment, the transition plate is provided with mounting holes, and the fixing plate is provided with fixing holes that match the mounting holes. The fixing plate and the transition plate are fixed by fasteners passing through the fixing holes and screwing into the mounting holes.

[0007] In one specific embodiment, in the above-mentioned inductor device for surface hardening of oil film bearings, the fastener is a fastening bolt.

[0008] In one specific embodiment, in the above-mentioned inductor device for surface hardening of oil film bearings, the number of fixed plates is 2 to 4.

[0009] Furthermore, in the aforementioned inductor device for surface hardening of oil film bearings, both the inlet pipe and the outlet pipe are circular pipes.

[0010] In one specific embodiment, in the above-mentioned inductor device for surface hardening of oil film bearings, the preset spacing is 2 to 4 mm.

[0011] The inductor device for surface quenching of oil film bearings of this invention has the following advantages and beneficial effects:

[0012] This device has a simple structure and is easy to assemble and disassemble. Compared with traditional dual-turn inductors, it significantly reduces the width of the instantaneous heating zone and the heat-affected zone, thereby increasing the rotation angle of the annular surface quenching zone of the oil film bearing. This significantly reduces the width of the surface quenching soft band, improving the wear resistance and service life of the oil film bearing. Furthermore, the structure of multi-segment square tubes folded and connected with the bottom magnetic conductor effectively optimizes the induction magnetic field. The water inlet and outlet pipes are connected to the liquid cooling system, which can dissipate heat in time and ensure the overall stable operation of the device, making it highly practical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0014] Figure 1 This is a schematic diagram of the usage status of a dual-turn sensor in the prior art;

[0015] Figure 2 This is a schematic diagram of the inductor device for surface hardening of oil film bearings according to this utility model.

[0016] Figure 3 This is a schematic diagram showing the location of the annular surface quenching zone in the inductor device for surface quenching of oil film bearings according to this utility model.

[0017] Figure 4 This is a schematic diagram of the induction device for surface hardening of oil film bearings according to this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Inductor device, 11-Multi-segment square tube, 12-Inlet pipe, 13-Magnetic conductor, 14-Outlet pipe, 15-Fixing plate, 16-Fixing hole, 100-Oil film bearing, 200-Annular surface quenching zone, 300-Double-turn inductor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] like Figures 1 to 4As shown in the figure, the utility model discloses an inductor device for surface quenching of oil film bearings. The top of the oil film bearing 100 is an annular surface quenching area 200. The oil film bearing 100 is connected with a rotary drive mechanism. The inductor device 1 is fixed on one side of the quenching equipment and is located at a preset distance above the annular surface quenching area 200. A transformer and a liquid cooling system are arranged on the quenching equipment. The inductor device for surface quenching of oil film bearings includes multiple square tubes 11 connected in a folded manner in sequence, a water inlet pipe 12 connected to one end of the multiple square tubes 11, a water outlet pipe 14 connected to the other end of the multiple square tubes 11, multiple fixing plates 15 uniformly distributed on one side of the multiple square tubes 11, and a magnetic conductor 13 arranged at the bottom of the multiple square tubes 11. Both ends of the magnetic conductor 13 are connected to the transformer through wires. By setting a sufficient number of magnetic conductor sheets, the magnetic conductor 13 can converge and optimize the induction magnetic field, making the magnetic field more concentrated and stable, improving the efficiency and uniformity of induction heating, and ensuring that the annular surface quenching area 200 can be quickly and uniformly heated to the required austenite state. The water inlet pipe 12 and the water outlet pipe 14 are both connected to the liquid cooling system. The multiple square tubes 11 are sequentially folded and welded by 7 square hollow copper tubes with different lengths to form a "Ji" - shaped single - turn shape. The water inlet pipe 12 and the water outlet pipe 14 are connected to the square hollow copper tubes by welding to ensure connection tightness.

[0022] Furthermore, in the inductor device for surface quenching of oil film bearings of the present utility model, a transition plate is arranged on the quenching equipment. An installation hole is opened on the transition plate. Fixing holes 16 matching the installation holes are symmetrically opened on the fixing plates 15. The fixing plates 15 are rectangular copper plates. Both the fixing holes 16 and the installation holes are threaded holes. The fixing plates 15 and the transition plate are fixed by fasteners passing through the fixing holes 16 and then screwing into the installation holes. With this setting, the inductor device 1 is firmly fixed on the transition plate of the quenching equipment and is then connected to the machine tool transformer to form a complete induction heating circuit. This connection method not only ensures the stability of the installation of the inductor device 1 but also makes the disassembly operation very convenient when maintaining the equipment or replacing the inductor.

[0023] As a specific implementation manner, in the inductor device for surface quenching of oil film bearings of the present utility model, the fastener is a fastening bolt.

[0024] As a specific implementation manner, in the inductor device for surface quenching of oil film bearings of the present utility model, the number of the fixing plates 15 is 2 - 4. Of course, the specific number of the fixing plates 15 needs to be set according to the actual working conditions such as the shape and size of the multiple square tubes 11 during actual use.

[0025] Furthermore, in the inductor device for surface hardening of oil film bearings of this utility model, both the inlet pipe 12 and the outlet pipe 14 are circular pipes. This arrangement facilitates a quick and stable connection between the inlet pipe 12, the outlet pipe 14 and the liquid cooling system, enabling the circulation of cooling water. This effectively removes the heat generated during the operation of the inductor, maintaining the normal operating temperature and performance of the inductor.

[0026] As a specific implementation, in the inductor device for surface hardening of oil film bearings of this utility model, the preset spacing is 2 to 4 mm. Within this range, while ensuring the induction heating effect, it can effectively avoid problems such as excessively high local temperature of the workpiece due to too close spacing, or reduced heating efficiency due to too far spacing.

[0027] The working principle of the inductor device for surface hardening of oil film bearings of this invention is as follows:

[0028] The quenching equipment is started, and the oil film bearing 100 is driven by the rotary drive mechanism to rotate at a constant speed, while the inductor device 1 remains stationary. During the rotation of the workpiece, the induced magnetic field generated by the magnetic conductor 13 acts on the annular surface quenching zone 200. Using the principle of electromagnetic induction, an induced current is generated in the annular surface quenching zone 200, which rapidly heats the annular surface quenching zone 200 to the austenitic state. Since the width of the instantaneous heating zone and the heat-affected zone of the inductor device 1 of this invention is significantly narrower than that of the traditional double-turn inductor 300, when the annular surface quenching zone 200 has rotated nearly one revolution, it is not necessary to cut off the power too early as with the traditional double-turn inductor 300. The rotation angle of the annular surface quenching zone 200 can be appropriately increased, which effectively reduces the width of the surface quenching soft strip. More specifically, the width of the soft strip formed by this device is B.

[0029] In summary, compared with the prior art, the inductor device for surface quenching of oil film bearings of this utility model has the following advantages and beneficial effects:

[0030] This device has a simple structure and is easy to assemble and disassemble. Compared with the traditional dual-turn inductor 300, it significantly reduces the width of the instantaneous heating zone and the heat-affected zone, thereby increasing the rotation angle of the annular surface quenching zone 200 of the oil film bearing 100. This significantly reduces the width of the surface quenching soft strip, improving the wear resistance and service life of the oil film bearing 100. Furthermore, the structure of multi-segment square tubes 11 folded and connected with the bottom magnetic conductor 13 effectively optimizes the induction magnetic field. The water inlet pipe 12 and water outlet pipe 14 are connected to the liquid cooling system, which can dissipate heat in time and ensure the overall stable operation of the device, making it highly practical.

[0031] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement state shown in the accompanying drawings.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An inductor device for surface quenching of an oil film bearing, wherein the top of the oil film bearing is an annular surface quenching zone, the oil film bearing is connected to a rotary drive mechanism, the inductor device is fixed to one side of a quenching device and located at a predetermined distance above the annular surface quenching zone, and the quenching device is equipped with a transformer and a liquid cooling system, characterized in that... The inductor device for surface hardening of oil film bearings includes multiple square tubes connected in sequence by folding, an inlet pipe connected to one end of the multiple square tubes, an outlet pipe connected to the other end of the multiple square tubes, multiple fixing plates evenly distributed on one side of the multiple square tubes, and a magnetic conductor disposed at the bottom of the multiple square tubes. The two ends of the magnetic conductor are connected to the transformer through wires, and both the inlet pipe and the outlet pipe are connected to the liquid cooling system.

2. The inductor device for surface hardening of oil film bearings according to claim 1, characterized in that, The quenching equipment is provided with a transition plate, which has mounting holes. The fixing plate has symmetrical fixing holes that match the mounting holes. The fixing plate and the transition plate are fixed by fasteners that pass through the fixing holes and are screwed into the mounting holes.

3. The inductor device for surface hardening of oil film bearings according to claim 2, characterized in that, The fastener is a fastening bolt.

4. The inductor device for surface hardening of oil film bearings according to claim 1, characterized in that, The number of fixing plates is 2 to 4.

5. The inductor device for surface hardening of oil film bearings according to claim 1, characterized in that, Both the inlet pipe and the outlet pipe are circular pipes.

6. The inductor device for surface hardening of oil film bearings according to claim 1, characterized in that, The preset spacing is 2 to 4 mm.

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