Induction quenching device and quenching method for inner hole of ball cup

Abstract

The invention provides an induction quenching device and quenching method for an inner hole of a ball cup. The induction quenching device comprises a rotating base, and a supporting structure used for supporting the ball cup is arranged at the top of the rotating base; the spraying ring is connected with the rotating base, the spraying ring is located outside the supporting structure, a containing cavity used for containing the ball cup is defined by the spraying ring, a first annular cavity is formed in the spraying ring, a plurality of spraying holes are formed in the inner circle of the spraying ring, and the spraying holes communicate with the first annular cavity; and the cooling liquid in the first annular cavity is sprayed into the containing cavity through the spraying holes. According to the induction quenching device in the scheme, the technical problem that in the prior art, large deformation is caused due to the fact that the wall thickness of a thin-wall part is not uniform during induction quenching can be solved.

Description

Technical Field

[0001] This invention relates to the technical field of induction hardening of the inner hole of a ball head seat, and more specifically, to an induction hardening apparatus and method for the inner hole of a ball head seat. Background Technology

[0002] In the automotive manufacturing industry, induction hardening of thin-walled parts such as ball joints in steering and suspension systems is a key technology used to improve the hardness and wear resistance of these parts. However, due to the uneven wall thickness of these parts, traditional induction hardening methods often lead to significant deformation, mainly due to the uneven stress generated during the heating and cooling process.

[0003] There is currently no effective solution to the technical problem of large deformation of thin-walled parts during induction hardening due to uneven wall thickness. Summary of the Invention

[0004] The main objective of this invention is to provide an induction hardening device and method for the inner hole of a ball head seat, so as to solve the technical problem that thin-walled parts undergo large deformation due to uneven wall thickness during induction hardening in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an induction hardening device for the inner hole of a ball head seat is provided, comprising: a rotating base, the top of which is provided with a support structure for supporting the ball head seat; a spray ring connected to the rotating base, the spray ring being located outside the support structure, the spray ring forming a receiving cavity for accommodating the ball head seat, the spray ring having a first annular cavity inside, the inner ring of the spray ring having a plurality of spray holes communicating with the first annular cavity, so that coolant in the first annular cavity is sprayed into the receiving cavity through the spray holes.

[0006] Furthermore, a cooling channel is provided inside the rotating base, and the spray ring is connected to the rotating base through a connecting pipe so that the first annular cavity is connected to the cooling channel.

[0007] Furthermore, a cooling pipe is provided on the rotating base, the cooling pipe is rotatably connected to the rotating base, and the cooling pipe is connected to the cooling channel.

[0008] Furthermore, the cooling pipe is connected to the rotating base via a rotary bearing. The inner ring of the rotary bearing is connected to the rotating base. The inner ring of the rotary bearing has a first through hole that communicates with the cooling channel. The outer ring of the rotary bearing has a second through hole. A second annular cavity is formed between the inner ring and the outer ring of the rotary bearing. The second through hole communicates with the second annular cavity. The cooling pipe is connected to the second through hole.

[0009] Furthermore, the cooling pipe is formed on the outer ring of the rotating bearing.

[0010] Furthermore, the rotating base is provided with a first oil seal and a second oil seal, and the rotating bearing is located between the first oil seal and the second oil seal. One end of the outer ring of the rotating bearing abuts against the first oil seal, and the other end of the outer ring of the rotating bearing abuts against the second oil seal.

[0011] Furthermore, the spray ring is provided with a clearance notch in the circumference so that part of the ball head can be inserted into the clearance notch.

[0012] Furthermore, a first support plate is provided on the outer wall of the rotating base, and a support seat is provided on the first support plate. The support seat is used to support the connecting rod part on the ball head seat.

[0013] Furthermore, a second support plate is provided on the outer wall of the rotating base. The second support plate is arranged opposite to the first support plate along the radial direction of the rotating base, and a counterweight is provided on the second support plate.

[0014] According to another aspect of the present invention, a quenching method for the inner hole of a ball head seat is provided, wherein the induction hardening device described above is used to quench the inner hole of the ball head seat. The quenching method includes the following steps: placing the ball head seat on the support structure of a rotating base, with the ball head of the ball head seat located within the receiving cavity of a spray ring; driving the rotating base to rotate and controlling the spray ring to spray coolant outward; driving the quenching inductor or the rotating base to move to a heating position and controlling the quenching inductor to heat the inner hole of the ball head seat; when the temperature of the inner hole of the ball head seat rises to a first target temperature, stopping the heating of the inner hole of the ball head seat and controlling the quenching spray pipe of the quenching inductor to spray coolant into the inner hole of the ball head seat; when the temperature of the inner hole of the ball head seat drops to a second target temperature, controlling the quenching spray pipe to stop spraying coolant, controlling the spray ring to stop spraying coolant, and controlling the rotating base to stop rotating; and removing the ball head seat when the quenching inductor or the rotating base moves to the initial position.

[0015] Applying the technical solution of this invention, a support structure is provided on the top of the rotating base, and a spray ring is located outside the support structure. The spray ring surrounds and forms a receiving cavity for accommodating the ball head seat. A first annular cavity for accommodating coolant is provided inside the spray ring, and multiple spray holes are provided on the inner ring of the spray ring so that the coolant in the first annular cavity is sprayed into the receiving cavity through the spray holes. The wall thickness of the ball head seat is uneven. When induction hardening the inner hole of the ball head seat, heat at the inner hole will be transferred outward to the outer surface of the ball head seat. While heating the inner hole of the ball head seat, coolant is sprayed onto the outer surface of the ball head seat through the spray ring, thus cooling the outer surface of the ball head seat in a timely manner. This achieves, to a certain extent, only the inner hole wall of the ball head seat is heated, thereby reducing the deformation of the ball head seat caused by uneven heating. The induction hardening device in the above solution can solve the technical problem of large deformation of thin-walled parts due to uneven wall thickness during induction hardening in the prior art. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the induction hardening apparatus in this application is shown;

[0018] Figure 2 A cross-sectional schematic diagram of the induction hardening apparatus in this application is shown.

[0019] The above figures include the following reference numerals:

[0020] 1. Rotating base;

[0021] 11. Support structure; 12. Mounting holes; 13. Cooling channel; 14. First support plate; 15. Support base; 16. Second support plate; 17. Counterweight;

[0022] 2. Spray ring;

[0023] 21. Receiving cavity; 22. Spray hole; 23. Connecting pipe; 24. Clearance notch;

[0024] 3. Rotary bearing;

[0025] 31. Cooling pipes;

[0026] 4. First oil seal;

[0027] 5. Second oil seal;

[0028] 6. Quenching spray pipe;

[0029] 7. Effective heating coil;

[0030] 8. Ball head seat. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0035] Combination Figures 1 to 2 As shown in the specific embodiment of this application, an induction hardening device for the inner hole of a ball head seat is provided.

[0036] Specifically, the induction hardening device includes a rotating base 1 and a spray ring 2. The rotating base 1 has a support structure 11 on its top for supporting the ball head seat 8. The spray ring 2 is connected to the rotating base 1 and is located outside the support structure 11. The spray ring 2 surrounds and forms a receiving cavity 21 for accommodating the ball head seat 8. The spray ring 2 has a first annular cavity inside, and the inner ring of the spray ring 2 has a plurality of spray holes 22. The spray holes 22 communicate with the first annular cavity so that the coolant in the first annular cavity is sprayed into the receiving cavity 21 through the spray holes 22.

[0037] In the embodiments of this application, a support structure 11 is provided on the top of the rotating base 1, and a spray ring 2 is provided outside the support structure 11. The spray ring 2 surrounds and forms a receiving cavity 21 for accommodating the ball head seat 8. A first annular cavity for accommodating coolant is provided inside the spray ring 2, and a plurality of spray holes 22 are provided on the inner ring of the spray ring 2 so that the coolant in the first annular cavity is sprayed into the receiving cavity 21 through the spray holes 22. The thickness of the hole wall of the ball head seat 8 is uneven. When the inner hole of the ball head seat 8 is induction hardened, the heat at the inner hole of the ball head seat 8 will be transferred outward to the outer surface of the ball head seat 8. While heating the inner hole of the ball head seat 8, coolant is sprayed onto the outer surface of the ball head seat 8 through the spray ring 2 to cool the outer surface of the ball head seat 8 in time. That is, to a certain extent, only the inner hole wall of the ball head seat 8 is heated, thereby reducing the deformation of the ball head seat 8 caused by uneven heating. The induction hardening device in the above scheme can solve the technical problem of large deformation of thin-walled parts due to uneven wall thickness during induction hardening in the prior art.

[0038] like Figure 1 , Figure 2 As shown, the top of the rotating base 1 is provided with a support structure 11, which is a groove formed on the top surface of the rotating base 1. The top surface of the groove mates with the end face of the ball head seat 8 to support the ball head seat 8. The bottom of the rotating base 1 is provided with a mounting hole 12, which extends along the axial direction of the rotating base 1. The mounting hole 12 is used to connect with a drive assembly, which is used to drive the rotating base 1 to rotate.

[0039] In one exemplary embodiment of this application, a cooling channel 13 is provided inside the rotating base 1, and a spray ring 2 is connected to the rotating base 1 through a connecting pipe 23 so that the first annular cavity is connected to the cooling channel 13.

[0040] In the embodiments of this application, when induction hardening is performed on the inner hole of the ball head seat 8, the spray ring 2 needs to rotate synchronously with the ball head seat 8. The spray ring 2 is connected to the rotating base 1, which can realize the synchronous rotation of the rotating base 1, the ball head seat 8 and the spray ring 2. That is, there is no need to set up a separate drive device to drive the spray ring 2 to rotate, which simplifies the overall structure and reduces the cost of the device.

[0041] Furthermore, a cooling pipe 31 is provided on the rotating base 1, the cooling pipe 31 is rotatably connected to the rotating base 1, and the cooling pipe 31 is connected to the cooling channel 13.

[0042] In the embodiments of this application, the cooling pipe 31 is rotatably connected to the rotating base 1, that is, during the rotation of the rotating base 1, the cooling pipe 31 remains relatively stationary to avoid the cooling pipe 31 from being damaged or falling off due to curling and winding.

[0043] Furthermore, the cooling pipe 31 is connected to the rotating base 1 via the rotating bearing 3. The inner ring of the rotating bearing 3 is connected to the rotating base 1. The inner ring of the rotating bearing 3 is provided with a first through hole, which communicates with the cooling channel 13. The outer ring of the rotating bearing 3 is provided with a second through hole. A second annular cavity is formed between the inner ring and the outer ring of the rotating bearing 3. The second through hole communicates with the second annular cavity. The cooling pipe 31 is connected to the second through hole.

[0044] In the embodiments of this application, a second annular cavity is formed between the inner ring and the outer ring of the rotary bearing 3. The second annular cavity is connected to the cooling channel 13 inside the rotating base 1 through a first through hole. The external coolant flows through the cooling pipe 31, the second annular cavity, and the cooling channel 13 to the interior of the spray ring 2. The arrangement of the rotary bearing 3 not only realizes the rotational connection between the cooling pipe 31 and the rotating base 1, but also acts as a transition channel to realize the connection between the cooling pipe 31 and the cooling channel 13.

[0045] like Figure 1 , Figure 2 As shown, the rotating base 1 has a cooling channel 13 inside, which is T-shaped. The cooling channel 13 includes a first flow section and a second flow section. The first flow section is arranged radially through the rotating base 1, and the second flow section is arranged axially along the rotating base 1. One end of the second flow section is connected to the first flow section, and the other end of the second flow section is connected to the connecting pipe 23 on the spray ring 2. A second annular cavity is formed between the inner ring and the outer ring of the rotating bearing 3. The first through hole on the inner ring of the rotating bearing 3 is arranged opposite to the first flow section so that the first flow section is connected to the second annular cavity. The outer ring of the rotating bearing 3 has a second through hole, which is connected to the second annular cavity. A cooling pipe 31 is provided at the second through hole, and the inlet of the cooling pipe 31 is connected to an external cooling tank.

[0046] Preferably, the cooling pipe 31 is formed on the outer ring of the rotary bearing 3.

[0047] In the embodiments of this application, the cooling pipe 31 is integrally formed on the outer ring of the rotary bearing 3, which not only increases the connection strength between the cooling pipe 31 and the rotary bearing 3, but also reduces the number of components in the overall device.

[0048] Furthermore, the rotating base 1 is provided with a first oil seal 4 and a second oil seal 5, and the rotating bearing 3 is located between the first oil seal 4 and the second oil seal 5. One end of the outer ring of the rotating bearing 3 abuts against the first oil seal 4, and the other end of the outer ring of the rotating bearing 3 abuts against the second oil seal 5.

[0049] In the embodiments of this application, the first oil seal 4, the second oil seal 5, the rotating base 1, and the rotating bearing 3 together form a closed transition channel to prevent coolant leakage.

[0050] like Figure 2 As shown, the first oil seal 4 has two first annular lips, one of which abuts against the outer wall of the rotating base 1, and the other abuts against the top surface of the outer ring of the rotating bearing 3. The second oil seal 5 has two second annular lips, one of which abuts against the outer wall of the rotating base 1, and the other abuts against the bottom surface of the outer ring of the rotating bearing 3.

[0051] Furthermore, the spray ring 2 is provided with a clearance notch 24 in the circumference so that part of the ball head seat 8 can be inserted into the clearance notch 24.

[0052] In the embodiments of this application, the spray ring 2 is provided with a clearance notch 24 in the circumferential direction so that the ball head of the ball head seat 8 can be fully inserted into the receiving cavity 21 of the spray ring 2, thereby fully cooling the outer surface of the ball head.

[0053] like Figure 1 As shown, the spray ring 2 has a clearance notch 24 in the circumference. On the basis of ensuring that the ball head seat 8 can be inserted into the clearance notch 24, the opening size of the clearance notch 24 is designed to be as small as possible to increase the spray range of the spray ring 2, thereby fully cooling the outer surface of the ball head seat 8 and reducing or avoiding the deformation of the ball head seat 8.

[0054] like Figure 1 As shown, the spray ring 2 has a connecting part in the circumferential direction. The connecting part extends outward along the axial direction of the spray ring 2. A connecting pipe 23 is formed on the connecting part. The spray ring 2 is connected to the cooling channel 13 of the rotating base 1 through the connecting pipe 23.

[0055] Furthermore, a first support plate 14 is provided on the outer wall of the rotating base 1, and a support seat 15 is provided on the first support plate 14. The support seat 15 is used to support the connecting rod part on the ball head seat 8.

[0056] In the embodiments of this application, the support base 15 is provided to fix the connecting rod portion of the ball head, so as to prevent the ball head seat 8 from generating circumferential displacement during rotation.

[0057] like Figure 1 As shown, the top of the rotating base 1 is provided with a support structure 11, and a first support plate 14 is connected to the outer wall of the support structure 11. The first support plate 14 extends along the radial direction of the rotating base 1, and a support seat 15 is formed on the top surface of the first support plate 14. The support seat 15 has an arc-shaped groove for supporting the connecting rod.

[0058] Furthermore, a second support plate 16 is provided on the outer wall of the rotating base 1. The second support plate 16 is arranged opposite to the first support plate 14 along the radial direction of the rotating base 1, and a counterweight 17 is provided on the second support plate 16.

[0059] In the embodiments of this application, the counterweight 17 is provided to balance the connecting rod on the ball joint 8, so that the ball joint 8 can rotate smoothly.

[0060] like Figure 1 As shown, the top of the rotating base 1 is provided with a support structure 11, and the second support plate 16 is connected to the outer wall of the support structure 11. The second support plate 16 extends along the radial direction of the rotating base 1 and is arranged opposite to the first support plate 14 along the radial direction of the rotating base 1. A counterweight 17 is formed on the top surface of the second support plate 16.

[0061] Furthermore, such as Figure 1 , Figure 2 As shown, the induction hardening device also includes a hardening inductor, which includes an effective heating coil 7 and a hardening spray pipe 6. The effective heating coil 7 is electrically connected to the heating circuit through a wire, and the hardening spray pipe 6 is connected to an external coolant tank. The hardening spray pipe 6 can be controlled by a control valve to spray coolant into the inner hole of the ball head seat 8.

[0062] According to another specific embodiment of this application, a quenching method for the inner hole of a ball head seat 8 is provided. The induction hardening device described in the above embodiment is used to quench the inner hole of the ball head seat 8. The quenching method includes the following steps:

[0063] Step S1: Place the ball head seat 8 on the support structure 11 of the rotating base 1, and the ball head of the ball head seat 8 is located in the receiving cavity 21 of the spray ring 2.

[0064] For example, before quenching the ball head seat 8, an induction quenching device is installed in the induction quenching equipment, the cooling pipe 31 on the rotating base 1 is connected to the first water pump, and the quenching spray pipe 6 is connected to the second water pump.

[0065] Step S2: Drive the rotating base 1 to rotate and control the spray ring 2 to spray coolant outward.

[0066] For example, the induction hardening equipment drives the rotating base 1 to rotate and turns on the first water pump so that the spray ring 2 sprays coolant onto the outer surface of the ball head of the ball head seat 8.

[0067] Step S3: Drive the quenching inductor or rotate the base 1 to the heating position and control the quenching inductor to heat the inner hole of the ball head seat 8.

[0068] For example, the induction hardening equipment drives the effective heating coil 7 of the hardening inductor to move to the inner hole of the ball head seat 8, closes the switch of the heating circuit, and the effective heating coil 7 gradually heats up.

[0069] Step S4: When the temperature of the inner hole of the ball head seat 8 rises to the first target temperature, stop heating the inner hole of the ball head seat 8 and control the quenching spray pipe 6 of the quenching inductor to spray coolant into the inner hole of the ball head seat 8.

[0070] For example, when the temperature of the inner hole of the ball head seat 8 rises to 900°C, the heating circuit is cut off to stop heating the inner hole of the ball head seat 8. At the same time, the second water pump is turned on so that the quenching spray pipe 6 sprays coolant into the inner hole of the ball head seat 8.

[0071] Step S5: When the temperature of the inner hole of the ball head seat 8 drops to the second target temperature, control the quenching spray pipe 6 to stop spraying coolant, control the spray ring 2 to stop spraying coolant, and control the rotating base 1 to stop rotating.

[0072] For example, when the temperature of the inner hole of the ball head seat 8 drops to 100°C, the first and second water pumps are turned off, and the rotating base 1 is controlled to stop rotating.

[0073] Step S6: When the quenching inductor or rotating base 1 moves to the initial position, remove the ball head seat 8.

[0074] For example, the induction hardening equipment drives the effective heating coil 7 of the hardening inductor to move to the outside of the inner hole of the ball head seat 8, removes the ball head seat 8, and completes the induction hardening of the inner hole of the ball head seat 8.

[0075] In the embodiments of this application, when the inner hole of the ball head seat 8 is induction hardened, the heat at the inner hole of the ball head seat 8 will be transferred outward to the outer surface of the ball head seat 8. While heating the inner hole of the ball head seat 8, coolant is sprayed onto the outer surface of the ball head seat 8 through the spray ring 2 to cool the outer surface of the ball head seat 8 in time. That is, to a certain extent, only the inner hole wall of the ball head seat 8 is heated, thereby reducing the deformation of the ball head seat 8 caused by uneven heating.

[0076] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0077] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0078] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An induction hardening device for the inner hole of a ball head seat, characterized in that, include: A rotating base (1) is provided on the top of which a support structure (11) is provided for supporting the ball head seat (8). A spray ring (2) is connected to the rotating base (1). The spray ring (2) is located outside the support structure (11). The spray ring (2) surrounds and forms a receiving cavity (21) for accommodating the ball head seat (8). A first annular cavity is provided inside the spray ring (2). A plurality of spray holes (22) are provided in the inner ring of the spray ring (2). The spray holes (22) are connected to the first annular cavity so that the coolant in the first annular cavity is sprayed into the receiving cavity (21) through the spray holes (22).

2. The induction hardening apparatus according to claim 1, characterized in that, The rotating base (1) is provided with a cooling channel (13), and the spray ring (2) is connected to the rotating base (1) through a connecting pipe (23) so that the first annular cavity is connected to the cooling channel (13).

3. The induction hardening apparatus according to claim 2, characterized in that, The rotating base (1) is provided with a cooling pipe (31), which is rotatably connected to the rotating base (1) and is connected to the cooling channel (13).

4. The induction hardening apparatus according to claim 3, characterized in that, The cooling pipe (31) is connected to the rotating base (1) via a rotating bearing (3). The inner ring of the rotating bearing (3) is connected to the rotating base (1). The inner ring of the rotating bearing (3) is provided with a first through hole, which communicates with the cooling channel (13). The outer ring of the rotating bearing (3) is provided with a second through hole. A second annular cavity is formed between the inner ring of the rotating bearing (3) and the outer ring of the rotating bearing (3). The second through hole communicates with the second annular cavity. The cooling pipe (31) is connected to the second through hole.

5. The induction hardening apparatus according to claim 4, characterized in that, The cooling pipe (31) is formed on the outer ring of the rotary bearing (3).

6. The induction hardening apparatus according to claim 4, characterized in that, The rotating base (1) is provided with a first oil seal (4) and a second oil seal (5). The rotating bearing (3) is located between the first oil seal (4) and the second oil seal (5). One end of the outer ring of the rotating bearing (3) abuts against the first oil seal (4), and the other end of the outer ring of the rotating bearing (3) abuts against the second oil seal (5).

7. The induction hardening apparatus according to any one of claims 1-6, characterized in that, The spray ring (2) is provided with a clearance notch (24) in the circumferential direction so that part of the ball head seat (8) can be inserted into the clearance notch (24).

8. The induction hardening apparatus according to any one of claims 1-6, characterized in that, The outer wall of the rotating base (1) is provided with a first support plate (14), and a support seat (15) is provided on the first support plate (14). The support seat (15) is used to support the connecting rod part on the ball head seat (8).

9. The induction hardening apparatus according to claim 8, characterized in that, The outer wall of the rotating base (1) is provided with a second support plate (16), which is arranged opposite to the first support plate (14) along the radial direction of the rotating base (1), and a counterweight (17) is provided on the second support plate (16).

10. A quenching method for the inner hole of a ball head seat, characterized in that, The ball head seat (8) is quenched using the induction hardening apparatus according to any one of claims 1-9, and the quenching method includes the following steps: The ball head seat (8) is placed on the support structure (11) of the rotating base (1), and the ball head of the ball head seat (8) is located in the receiving cavity (21) of the spray ring (2); Drive the rotating base (1) to rotate and control the spray ring (2) to spray coolant outward; Drive the quenching sensor or the rotating base (1) to the heating position, and control the quenching sensor to heat the inner hole of the ball head seat (8); When the temperature of the inner hole of the ball head seat (8) rises to the first target temperature, the heating of the inner hole of the ball head seat (8) is stopped, and the quenching spray pipe (6) of the quenching sensor is controlled to spray coolant into the inner hole of the ball head seat (8). When the temperature of the inner hole of the ball head seat (8) drops to the second target temperature, the quenching spray pipe (6) is controlled to stop spraying coolant, the spray ring (2) is controlled to stop spraying coolant, and the rotating base (1) is controlled to stop rotating. When the quenching inductor or the rotating base (1) moves to the initial position, the ball head seat (8) is removed.

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