A crankshaft induction hardening equipment

Abstract

A crankshaft induction hardening device includes: a bed for fixing the crankshaft and driving its rotation; an induction heating mechanism for induction heating the connecting rod journal around the circumference of the crankshaft, the induction heating mechanism having multiple phase control intervals along the circumference of the connecting rod journal, the induction heating power of each phase control interval changing with the rotation of the crankshaft, each phase of the connecting rod journal and the volume of the crank connected to it being positively correlated with the heating power obtained, so that the phase with a larger connected volume can obtain higher heating power; a cooling mechanism for spraying quenching liquid onto the connecting rod journal around the circumference of the connecting rod journal; and a follow-up balancing mechanism mounted on the bed, the induction heating mechanism and the cooling mechanism mounted on the follow-up balancing mechanism; when the crankshaft rotates, the follow-up balancing mechanism drives the induction heating mechanism and the cooling mechanism to move with the connecting rod journal.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for parts, and in particular to an induction hardening device for crankshafts. Background Technology

[0002] As one of the core components of an engine, the crankshaft's performance directly affects the engine's performance and lifespan. Induction hardening of the crankshaft can effectively improve its surface mechanical properties, resulting in stronger mechanical properties and a longer lifespan compared to before hardening. However, current crankshaft hardening equipment designs focus only on heating and cooling the crankshaft, neglecting the deformation that occurs during the hardening process. This leads to stress distribution within the crankshaft during quenching, causing deformation. Therefore, there is an urgent need for crankshaft induction hardening equipment that can reduce deformation caused by internal stress during the induction hardening process. Summary of the Invention

[0003] In view of the above-mentioned problems of the prior art, this application provides a crankshaft induction hardening equipment, which can reduce the deformation caused by stress generated inside the crankshaft during the induction hardening process.

[0004] To achieve the above objectives, this application provides a crankshaft induction hardening device, comprising: a bed for fixing the crankshaft and driving it to rotate; an induction heating mechanism, wherein multiple phase control intervals are uniformly arranged along the circumference of the connecting rod journal of the crankshaft, and the induction heating power of the multiple phase control intervals is individually controlled when induction heating is performed on the connecting rod journal; cranks are connected to both ends of the connecting rod journal, and multiple phase regions are uniformly arranged along the circumference of the connecting rod journal, wherein each phase region corresponds to one of the phase control intervals, and the volume of the region corresponding to each phase region of the crank is positively correlated with the induction heating power of each phase control interval; a cooling mechanism for spraying quenching liquid onto the connecting rod journal around its circumference; and a follow-up balancing mechanism mounted on the bed, wherein the induction heating mechanism and the cooling mechanism are mounted on the follow-up balancing mechanism; when the crankshaft rotates, the follow-up balancing mechanism drives the induction heating mechanism and the cooling mechanism to move with the connecting rod journal.

[0005] As described above, since the two ends of the connecting rod journal are mounted on the crank edges of the crankshaft, the volumes of the two ends of the connecting rod journal at different circumferential positions are not the same as the corresponding positions on the crank. Therefore, after induction heating, the heat transferred to the crank at different circumferential positions of the connecting rod journal is not uniform. Specifically, taking the boundary line of different phase regions of the connecting rod journal as the boundary and extending radially along the edges of the connecting rod journal on both sides of the crank, it can be found that the two sides of the crank will have significant volume differences at different phase angles, resulting in significant differences in heat capacity at different phase angles. Therefore, if the heating power is kept constant for different phase regions of the connecting rod journal during induction heating, the final temperatures of the different phase regions of the connecting rod journal will not be uniform due to the difference in heat transfer, i.e., the temperature of the connecting rod journal will be uneven.

[0006] In this application, by making the heating power obtained by each phase region of the connecting rod journal and the crank volume connected to that phase region positively correlated with the heating power obtained by that phase region, the induction heating power obtained by the phase region with higher heat capacity can be increased, thereby making the temperature of the connecting rod journal more uniform under induction heating. This results in more uniform deformation of the connecting rod journal during thermal expansion, reducing internal stress in the connecting rod journal, and thus reducing deformation caused by internal stress during crankshaft induction hardening.

[0007] Furthermore, by incorporating a follow-up balancing mechanism, the induction heating and cooling mechanisms can be driven to move along with the connecting rod journal as the crankshaft rotates. This reduces the impact of crankshaft rotation on induction heating and cooling quenching, resulting in a more uniform temperature distribution on the connecting rod journal during heating. Consequently, internal stress is reduced during quenching, thus minimizing deformation caused by stress changes.

[0008] As one possible implementation, the follow-up balancing mechanism includes: a second mounting bracket mounted on the bed; a slide plate mounted on the second mounting bracket, located above the crankshaft and slidably connected to the second mounting bracket in the vertical direction; an induction heating mechanism and a cooling mechanism mounted on the slide plate, located below the slide plate; and a lifter mounted on the second mounting bracket, drivingly connected to the slide plate to move the slide plate up and down.

[0009] As such, the lifting device can drive the pallet to move up and down, so that when the crankshaft rotates, the induction heating mechanism and the cooling mechanism can move up and down with the connecting rod journal.

[0010] As one possible implementation, the follow-up balancing mechanism further includes a counterweight connected to the slide plate via a chain, which applies an upward pulling force to the slide plate through its gravity.

[0011] Therefore, by setting a counterweight, the upward pulling force is applied to the support plate by the gravity of the counterweight, thereby reducing the driving difficulty and driving burden of the elevator.

[0012] As one possible implementation, the weight of the counterweight is less than the sum of the weights of the slide, the induction heating mechanism, and the cooling mechanism.

[0013] Therefore, when the lifting device drives the slide to move up and down, only an upward pulling force needs to be applied to the slide. That is, the up and down movement of the slide can be controlled by increasing or decreasing the magnitude of the upward pulling force applied to the slide. This reduces the difficulty of controlling the slide, induction heating mechanism, and cooling mechanism.

[0014] As one possible implementation, the follow-up balancing mechanism further includes: a hanging plate, one end of which is hinged to the slide plate and the other end of which is hinged to the induction heating mechanism, so that the hanging plate swings in a plane perpendicular to the axis of the crankshaft; multiple hanging plates are provided, forming a parallelogram structure between the slide plate and the induction heating mechanism.

[0015] As described above, by forming a parallelogram structure between the suspension plate and the induction heating mechanism, the induction heating mechanism can maintain a constant posture when it swings left and right with the connecting rod journal. This improves the stability of induction heating, thereby enhancing the temperature uniformity of the connecting rod journal and reducing deformation caused by stress generated inside the crankshaft.

[0016] As one possible implementation, the bed has a servo motor that drives the crankshaft to rotate; the phase control interval corresponding to the region of the connecting rod journal facing the crankshaft axis is determined based on the rotation information of the servo motor.

[0017] As described above, the crankshaft position can be confirmed in real time based on the rotation information of the servo motor, allowing for timely adjustment of the induction heating power in each phase control zone. This reduces the control difficulty of the crankshaft induction hardening equipment, improves control accuracy, and consequently reduces deformation caused by internal stress in the crankshaft.

[0018] As one possible implementation, multiple phase control intervals are evenly distributed along the circumference of the connecting rod journal.

[0019] Therefore, by uniformly distributing the phase control interval along the circumference of the connecting rod journal, the control difficulty of the crankshaft induction hardening equipment can be reduced and the temperature control accuracy improved when the power of induction heating is changed by controlling the phase control interval during crankshaft rotation. This reduces the deformation caused by stress generated inside the crankshaft.

[0020] As one possible implementation, the induction heating mechanism includes: a first mounting frame, the first mounting frame being saddle-shaped, the top of the first mounting frame being connected to the follower balancing mechanism, and the bottom being provided with a notched quenching space for accommodating the connecting rod journal; a magnetic conductor, the magnetic conductor being mounted on the first mounting frame and arranged around the quenching space; an induction coil, the induction coil being wound around the magnetic conductor; and a positioning block, the positioning block being mounted on the first mounting frame, one end of the positioning block extending into the quenching space and abutting against the connecting rod journal, so that a first gap is maintained between the connecting rod journal and the induction coil in the radial direction of the connecting rod journal.

[0021] As described above, by setting a positioning block to abut against the connecting rod journal, a first gap is maintained between the connecting rod journal and the induction coil in the radial direction of the connecting rod journal. This improves the stability between the induction heating mechanism and the connecting rod journal as the crankshaft rotates, thereby enhancing the stability of induction heating and making the temperature of the connecting rod journal more uniform. Consequently, the internal stress of the connecting rod journal can be reduced, thus minimizing deformation caused by internal stress during the induction hardening of the crankshaft.

[0022] As one possible implementation, the first clearance is 1% of the diameter of the connecting rod journal.

[0023] Therefore, the effect of induction heating can be improved while maintaining an appropriate gap between the connecting rod journal and the induction coil.

[0024] As one possible implementation, a second gap is maintained between the magnetic conductor and the cranks at both ends of the connecting rod journal, the second gap being 0.8-1.2 mm.

[0025] As such, the induction heating mechanism can obtain sufficient space for movement between the two cranks, and at the same time, the connecting rod journal can obtain sufficient induction heating area, thereby improving the induction heating effect.

[0026] As one possible implementation, multiple positioning blocks are provided, located on both sides and the top of the quenching space respectively.

[0027] As described above, by setting multiple positioning blocks, the connecting rod journal can be positioned on both sides and at the top of the quenching space, thereby improving the stability of the induction heating mechanism as it moves with the connecting rod journal, thus improving the induction heating effect and reducing stress generation.

[0028] As one possible implementation, the cooling mechanism includes multiple sprayers evenly arranged around the circumference of the connecting rod journal and oriented towards the axis of the connecting rod journal.

[0029] As described above, by uniformly arranging multiple sprayers around the circumference of the connecting rod journal, the cooling of the connecting rod journal can be made more uniform during the cooling and quenching process, thereby reducing stress generation and minimizing potential crankshaft deformation.

[0030] These and other aspects of the invention will become more apparent from the following description of several embodiments. Attached Figure Description

[0031] The various features of the present invention and the relationships between them are further explained below with reference to the accompanying drawings. The drawings are exemplary; some features are not shown to scale, and some drawings may omit conventional features in the field of this application that are not essential to this application, or additional features that are not essential to this application may be shown. The combination of features shown in the drawings is not intended to limit the present application. Furthermore, throughout this specification, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:

[0032] Figure 1 This is a flowchart of the crankshaft induction hardening deformation control method in this application;

[0033] Figure 2 This is a schematic diagram of the crankshaft induction hardening equipment in this application;

[0034] Figure 3 for Figure 2 Schematic diagram of the servo balancing mechanism;

[0035] Figure 4 This is a schematic diagram of the induction heating mechanism and the cooling mechanism;

[0036] Figure 5 A schematic diagram of a real-time energy monitoring and pulsed power distribution control system;

[0037] Figure 6 A schematic diagram of the power fluctuation curve for induction heating;

[0038] Figure 7 This is a schematic diagram of the phase control interval;

[0039] Figure 8 This is a schematic diagram showing the positions of the upper and lower sprayers;

[0040] Figure 9 This is a structural diagram of the support mechanism.

[0041] Explanation of reference numerals in the attached figures

[0042] 10 Crankshaft induction hardening equipment; 100 Bed; 110 Third mounting bracket; 111 Mounting plane; 120 Headstock mechanism; 121 Chuck; 130 Tightening mechanism; 131 Center; 140 Fifth mounting bracket; 141 Second mounting plane; 200 Follow-up balancing mechanism; 210 Second mounting bracket; 220 Second servo motor; 230 Slide plate; 240 Lifter; 250 Counterweight; 260 Hanger; 270 Hanging plate; 300 Induction heating mechanism; 310 First mounting bracket; 311 Hardening space; 320 Magnetic conductor; 330 Positioning block; 400 Cooling mechanism; 410 Upper sprayer; 420 Lower sprayer; 500 Support mechanism; 510 Fourth mounting bracket; 520 Support structure; 530 Pressure head; 540 Third servo motor.

[0043] 20 Crankshaft; 21 Connecting rod journal; 22 Crank. Detailed Implementation

[0044] The terms "first, second, third, etc." or similar terms such as module A, module B, module C, etc., used in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that a specific order or sequence may be interchanged where permitted so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0045] In the following description, the labels of the steps, such as S110, S120, etc., do not necessarily mean that the steps will be executed in this way. The order of the steps can be interchanged or executed simultaneously if permitted.

[0046] The term "comprising" as used in the specification and claims should not be construed as limiting itself to what follows; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the mentioned feature, integral, step, or component, but does not exclude the presence or addition of one or more other features, integrals, steps, or components, or groups thereof. Thus, the statement "device comprising means A and B" should not be limited to a device consisting solely of components A and B.

[0047] The term "an embodiment" or "an embodiment" as used in this specification means that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in at least one embodiment of the invention. Therefore, the terms "in one embodiment" or "in an embodiment" appearing throughout this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics can be combined in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0048] Below, with reference to the accompanying drawings, possible embodiments of the crankshaft induction hardening equipment 10 in this application will be described by way of example.

[0049] This application provides a crankshaft induction hardening device 10, including a bed 100, an induction heating mechanism 300, a cooling mechanism 400, and a follow-up balancing mechanism 200. The bed 100 is used to fix a crankshaft 20 and drive it to rotate. The induction heating mechanism 300 has multiple phase control zones evenly arranged along the circumference of the connecting rod journal 21 of the crankshaft 20, and the induction heating power of each phase control zone is individually controlled during induction heating of the connecting rod journal 21. Cranks 22 are connected to both ends of the connecting rod journal 21, and multiple phase regions are evenly arranged along the circumference of the connecting rod journal 21. Each phase region corresponds to one of the phase control zones, and the volume of the region corresponding to each phase region on the crank 22 is positively correlated with the induction heating power of each phase control zone. The cooling mechanism 400 sprays quenching fluid onto the connecting rod journal 21 circumferentially. The follow-up balancing mechanism 200 is mounted on the bed 100, and the induction heating mechanism 300 and the cooling mechanism 400 are mounted on the follow-up balancing mechanism 200. When the crankshaft 20 rotates, the follow-up balancing mechanism 200 drives the induction heating mechanism 300 and the cooling mechanism 400 to move with the connecting rod journal 21.

[0050] As described above, since the two ends of the connecting rod journal 21 are mounted on the edges of the crank 22 of the crankshaft 20, the volumes of the two ends of the connecting rod journal 21 at different circumferential positions are not the same as the corresponding positions of the crank 22. Therefore, after induction heating, the heat transferred to the crank 22 at different circumferential positions of the two ends of the connecting rod journal 21 is not uniform. Specifically, taking the boundary line of different phase regions of the connecting rod journal 21 as the boundary and extending radially along the edges of the connecting rod journal 21 towards the edges of the cranks 22 on both sides, it can be found that the two cranks 22 will have significant volume differences at different phase angles, resulting in significant differences in heat capacity at different phase angles. Therefore, if the heating power of different phase regions of the connecting rod journal 21 remains consistent during induction heating, the final temperatures of the different phase regions of the connecting rod journal 21 will not be the same due to the difference in heat transfer, i.e., the temperature of the connecting rod journal 21 will be uneven.

[0051] In this application, by adjusting the heating power according to the phase state, the volume of each phase region of the connecting rod journal 21 and the crank 22 connected to that phase region is positively correlated with the heating power obtained by the phase region. This allows the induction heating power of the phase with higher heat capacity to be higher, thereby making the temperature of the connecting rod journal 21 more uniform under induction heating and reducing the stress inside the connecting rod journal 21. This reduces the deformation caused by the stress generated inside the crankshaft 20 during the induction hardening process of the crankshaft 20.

[0052] In some embodiments, the bed 100 has a servo motor that drives the crankshaft 20 to rotate. The phase control interval corresponding to the region of the connecting rod journal 21 facing the crankshaft 20 axis is determined based on the rotation information of the servo motor. Therefore, the position of the crankshaft 20 can be confirmed in real time based on the rotation information of the servo motor, and the induction heating power of each phase control interval can be adjusted promptly. This reduces the control difficulty of the crankshaft induction hardening equipment 10, improves control accuracy, and reduces deformation caused by stress generated inside the crankshaft 20.

[0053] In some embodiments, multiple phase control intervals are uniformly arranged along the circumference of the connecting rod journal 21. Thus, by uniformly arranging the phase control intervals along the circumference of the connecting rod journal 21, the control difficulty of the crankshaft induction hardening equipment 10 can be reduced and the temperature control accuracy can be improved when the power of induction heating is changed by controlling the phase control intervals during crankshaft 20 rotation, thereby reducing deformation caused by stress generated inside the crankshaft 20.

[0054] In some embodiments, the induction heating mechanism 300 includes a first mounting bracket 310, a magnetic conductor 320, an induction coil, and a positioning block 330. The first mounting bracket 310 is saddle-shaped, its top connected to a follower balancing mechanism 200, and its bottom having a notched quenching space 311 for accommodating a connecting rod journal 21. The magnetic conductor 320 is mounted on the first mounting bracket 310 and arranged around the quenching space 311. The magnetic conductor 320 is plugged into the induction coil. The positioning block 330 is mounted on the first mounting bracket 310, with one end extending into the quenching space 311 and abutting against the connecting rod journal 21, maintaining a first gap in the radial direction between the connecting rod journal 21 and the induction coil.

[0055] As described above, by setting the positioning block 330 to abut against the connecting rod journal 21, a first gap is maintained between the connecting rod journal 21 and the induction coil in the radial direction of the connecting rod journal 21. This improves the stability between the induction heating mechanism 300 and the connecting rod journal 21 as the crankshaft 20 rotates, thereby enhancing the stability of induction heating and making the temperature of the connecting rod journal 21 more uniform. Consequently, the internal stress of the connecting rod journal 21 can be reduced, thus minimizing deformation caused by internal stress during the induction hardening of the crankshaft 20.

[0056] In some embodiments, the first gap is 1% of the diameter of the connecting rod journal 21. This ensures effective induction heating while maintaining a proper gap between the connecting rod journal 21 and the induction coil.

[0057] In some embodiments, a second gap is maintained between the magnetic conductor 320 and the cranks 22 at both ends of the connecting rod journal 21, the second gap being 0.8-1.2 mm. This allows the induction heating mechanism 300 to have sufficient space for movement between the two cranks 22, and simultaneously allows the connecting rod journal 21 to have sufficient induction heating area, thereby improving the induction heating effect.

[0058] In some embodiments, the follow-up balancing mechanism 200 includes a second mounting bracket 210, a slide plate 230, and a lifter 240. The second mounting bracket 210 is mounted on the bed 100. The slide plate 230 is mounted on the second mounting bracket 210, located above the crankshaft 20, and slidably connected to the second mounting bracket 210 in a vertical direction. The induction heating mechanism 300 and the cooling mechanism 400 are mounted on the slide plate 230, located below the slide plate 230. The lifter 240 is mounted on the second mounting bracket 210 and is drively connected to the slide plate 230, driving the slide plate 230 to move up and down. Thus, by driving the slide plate 230 up and down through the lifter 240, the induction heating mechanism 300 and the cooling mechanism 400 can move up and down with the connecting rod journal 21 when the crankshaft 20 rotates.

[0059] In some embodiments, the follow-up balancing mechanism 200 further includes a counterweight 250, which is connected to the slide plate 230 via a chain. The counterweight 250 exerts an upward pulling force on the slide plate 230 through its gravity. Thus, by setting the counterweight 250 and applying an upward pulling force to the slide plate 230 through its gravity, the driving difficulty and driving burden of the elevator 240 can be reduced.

[0060] In some embodiments, the weight of the counterweight 250 is less than the sum of the weights of the slide 230, the induction heating mechanism 300, and the cooling mechanism 400. Therefore, when the lifter 240 drives the slide 230 to move up and down, it is only necessary to control the lifter 240 to apply an upward pulling force to the slide 230. That is, by increasing or decreasing the magnitude of the upward pulling force applied to the slide 230, the total pulling force on the slide 230 is controlled, thereby causing the slide 230 to move up and down. This reduces the difficulty of controlling the slide 230, the induction heating mechanism 300, and the cooling mechanism 400.

[0061] In some embodiments, the follow-up balancing mechanism 200 further includes a hanging plate 270, one end of which is hinged to the slide plate 230, and the other end is hinged to the induction heating mechanism 300, allowing the hanging plate 270 to swing in a plane perpendicular to the axis of the crankshaft 20. Multiple hanging plates 270 are provided, forming a parallelogram structure between the slide plate 230 and the induction heating mechanism 300. This allows the induction heating mechanism 300 to maintain a constant posture while swinging left and right with the connecting rod journal 21. This improves the stability of induction heating, thereby increasing the temperature uniformity of the connecting rod journal 21 and reducing deformation caused by internal stress in the crankshaft 20.

[0062] In some embodiments, the lifter 240 may be a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, or other suitable linear drive device.

[0063] This application also provides a crankshaft induction hardening deformation control method 60. Below, with reference to the accompanying drawings, possible embodiments of the crankshaft induction hardening deformation control method 60 in this application will be described by way of example.

[0064] In the crankshaft induction hardening deformation control method 60 of this application, when the crankshaft 20 rotates, the induction heating mechanism 300 moves with the connecting rod journal 21 of the crankshaft 20. The induction heating mechanism 300 is provided with multiple phase control intervals along the circumference of the connecting rod journal 21. When heating the connecting rod journal 21, the induction heating power of the multiple phase control intervals is controlled separately.

[0065] Step S610: Obtain location information.

[0066] In step S610, the position information of the crankshaft 20 after installation is obtained, that is, the initial position information of the crankshaft 20 is obtained, which is used to determine the initial phase of the connecting rod journal 21 in the circumferential direction.

[0067] Step S620: Determine the first induction heating power parameters.

[0068] In step S620, the first induction heating power parameter is determined based on the position information. The first induction heating power parameter is the induction heating power of each phase control interval. The volume of the crank 22 and the region corresponding to each phase region is positively correlated with the first induction heating power parameter (that is, the larger the volume, the larger the first induction heating power parameter of the corresponding phase control interval).

[0069] Step S630: Issue the first control command.

[0070] In step S630, a first control command is issued, which controls each phase control interval of the induction heating mechanism to perform induction heating on the connecting rod journal 21 according to the first induction heating power parameter.

[0071] Step S640: Obtain crankshaft speed information.

[0072] In step S640, the rotational speed of crankshaft 20 is obtained.

[0073] Step S650: Determine the switching time.

[0074] In step S650, the switching time is determined based on the crankshaft speed information. The switching time is the time it takes for the phase region to rotate to the position corresponding to the adjacent phase control interval.

[0075] Step S680: Determine the second induction heating power parameters.

[0076] In step S680, after the phase region rotates to the position corresponding to the adjacent phase control interval, the volume of the region corresponding to each phase region of the crank 22 is no longer positively correlated with the first induction heating power parameter. Therefore, it is necessary to switch the induction heating power of each phase control interval accordingly to meet the requirement of positive correlation. Thus, the second induction heating power parameter can be determined based on the correspondence between each phase region and each phase control interval after the switch. The second induction heating power parameter is the induction heating power of each phase control interval after the phase region rotation switch. This ensures that after the switch, the volume of the region corresponding to each phase region of the crank 22 is positively correlated with the second induction heating power parameter.

[0077] Step S690: Issue the second control command.

[0078] In step S690, a second control command is issued, which controls each phase control interval of the induction heating mechanism to perform induction heating on the connecting rod journal 21 according to the second induction heating power parameters when the switching time is reached.

[0079] As described above, since the two ends of the connecting rod journal 21 are mounted on the edges of the crank 22 of the crankshaft 20, the volumes of the two ends of the connecting rod journal 21 at different circumferential positions are not the same as the corresponding positions of the crank 22. This results in significant differences in the heating effect received by the connecting rod journal 21 and the crank 22 at both ends in different phase control ranges after induction heating. Therefore, if the heating power is kept constant at different positions of the connecting rod journal 21 during induction heating, the final temperature of the connecting rod journal 21 will not be uniform due to the different heat transfer characteristics.

[0080] In this application, the correspondence between each phase region and each phase control interval of the connecting rod journal 21 can be determined based on the installation position information of the crankshaft 20 (the phase control interval along the radial direction of the phase region along the connecting rod journal 21 is its corresponding phase control interval). The induction heating power is adjusted according to the position of the connecting rod journal 21 and the phase control interval. That is, when the position of the connecting rod journal 21 corresponding to the phase control interval changes during the rotation of the crankshaft 20, the induction heating power of the phase control interval is adjusted to make the temperature of the connecting rod journal 21 under induction heating more uniform, the deformation during thermal expansion more uniform, and the internal stress of the connecting rod journal 21 reduced. This reduces deformation caused by internal stress during the induction hardening process of the crankshaft 20.

[0081] In some embodiments, the crankshaft 20 is driven to rotate by a servo motor. Step S640 specifically involves:

[0082] Step S641: Obtain motor speed information.

[0083] In step S641, the rotational speed information of the servo motor is obtained.

[0084] Step S642: Determine the crankshaft speed information.

[0085] In step S642, the crankshaft speed information is determined based on the motor speed information.

[0086] As described above, by determining the rotational speed of the crankshaft 20 using the rotational speed information of the servo motor, the speed and accuracy of adjusting the induction heating power within the phase control range can be improved, thereby enhancing the induction heating effect and reducing stress generation.

[0087] In some embodiments, multiple phase control intervals are uniformly arranged along the circumference of the connecting rod journal 21. By uniformly arranging the phase control intervals along the circumference of the connecting rod journal 21, the control difficulty of the crankshaft induction hardening equipment can be reduced and the temperature control accuracy can be improved when the power of induction heating is changed by controlling the phase control intervals during crankshaft 20 rotation, thereby reducing the deformation caused by stress generated inside the crankshaft 20.

[0088] In some embodiments, the crankshaft induction hardening deformation control method 60 further includes:

[0089] Step S660: Obtain the actual induction heating power parameters.

[0090] In step S660, the actual induction heating power parameters are obtained. The actual induction heating power parameters are the actual induction heating power of each phase control interval when the induction heating mechanism 300 is induction heating.

[0091] Step S670: Determine whether it is within the tolerance range.

[0092] In step S670, it is determined whether the actual induction heating power parameter is within the tolerance range, which is the allowable fluctuation range of the induction heating power within the phase control interval. If the actual induction heating power parameter is within the tolerance range, it indicates that the induction heating mechanism 300 performs induction heating on the connecting rod journal 21 according to the first induction heating power parameter, which meets the quenching process requirements. If the actual induction heating power parameter is outside the tolerance range, it indicates that the induction heating mechanism 300 does not perform induction heating on the connecting rod journal 21 according to the first induction heating power parameter, which does not meet the quenching process requirements. When the induction heating power is within the tolerance range, proceed to step S680; when the induction heating power is outside the tolerance range, proceed to step S671.

[0093] Step S671: Terminate quenching.

[0094] In step S671, if the induction heating power is outside the tolerance range, it indicates that the induction heating mechanism 300, when performing induction heating on the connecting rod journal 21 of the crankshaft 20 according to the first control command in step S630, did not perform induction heating on the connecting rod journal 21 according to the first induction heating power parameter. Alternatively, it indicates that the induction heating mechanism 300, when performing induction heating on the connecting rod journal 21 of the crankshaft 20 according to the second control command in step S690, did not perform induction heating on the connecting rod journal 21 according to the second induction heating power parameter. In other words, the quenching process of the crankshaft 20 was not performed according to the quenching process requirements, therefore the quenching is terminated.

[0095] In some embodiments, the tolerance range is within ±5%. Therefore, by setting the tolerance range to within ±5%, the control accuracy of induction heating can be further improved, thereby enhancing the induction heating effect.

[0096] In some embodiments, at least one closed-loop control (detecting actual power → comparing with process parameters → adjusting to the tolerance range) is completed before step S680. After completing this closed loop, the next closed loop is triggered, i.e., entering steps S680 and S690, and returning to step S660 after step S690. This cycle is repeated to achieve continuous adjustment of the induction heating power in different phase control ranges in accordance with the rotation of the crankshaft 20.

[0097] In some embodiments, the induction heating power corresponding to each phase region remains unchanged after switching. Therefore, by keeping the induction heating power corresponding to each phase region unchanged after switching, the temperature rise of the connecting rod journal 21 under induction heating can be made more stable, thereby improving the stability of induction heating.

[0098] In some embodiments, multiple phase control intervals are uniformly arranged along the circumference of the connecting rod journal 21. Therefore, by uniformly arranging the phase control intervals along the circumference of the connecting rod journal 21, the temperature control of the connecting rod journal 21 can be made more uniform, thereby improving the uniformity of induction heating and reducing stress generation.

[0099] In some embodiments, 18 phase control intervals are provided.

[0100] As described above, by setting 18 phase control intervals, the control accuracy of the connecting rod journal 21 temperature can be improved, thereby improving the uniformity of induction heating and reducing stress generation.

[0101] In some embodiments, the magnetic field region of induction heating constrains and focuses on the connecting rod journal 21 of the crankshaft 20 and the transition fillet region between the crank 22 and the connecting rod journal 21.

[0102] As mentioned above, through the electromagnetic induction effect, eddy currents can be generated on the connecting rod journal 21 and the fillet surface, causing them to heat up rapidly, thereby improving the induction heating effect.

[0103] The above description provides an exemplary description of possible embodiments of the crankshaft induction hardening equipment 10 and the crankshaft induction hardening deformation control method 60 in this application. Below, with reference to the accompanying drawings, a detailed description of the specific structure of the crankshaft induction hardening equipment 10 in this application will be given in a specific embodiment.

[0104] Figure 2 This is a schematic diagram of the crankshaft induction hardening equipment 10 in this application. Figure 2 As shown, the crankshaft induction hardening equipment 10 includes a bed 100, a follower balancing mechanism 200, an induction heating mechanism 300, a cooling mechanism 400, and a support mechanism 500. The bed 100 is used to fix the crankshaft 20 and drive it to rotate. The induction heating mechanism 300 is used to induction heat the connecting rod journal 21 of the crankshaft 20. The cooling mechanism 400 is used to harden the connecting rod journal 21. The follower balancing mechanism 200 is used to drive the induction heating mechanism 300 and the cooling mechanism 400 to move with the rotation of the crankshaft 20. The support mechanism 500 is used to support, clamp, and fix the crankshaft 20, limiting the deformation of the crankshaft 20 during heating and hardening.

[0105] like Figure 2As shown, the bed frame 100 includes a third mounting bracket 110, a headboard mechanism 120, and a clamping mechanism 130. The third mounting bracket 110 has a horizontal, rectangular mounting surface 111 at its top. The headboard mechanism 120 is fixedly mounted on the second mounting surface 141 of the fifth mounting bracket 140, located at one end of the second mounting surface 141. The clamping mechanism 130 is mounted on the second mounting surface 141 of the fifth mounting bracket 140 and is slidably connected to the fifth mounting bracket 140 along the length of the second mounting surface 141, thus allowing it to move closer to or further away from the headboard mechanism 120.

[0106] The headstock mechanism 120 has a first servo motor and a chuck 121. The chuck 121 is used to clamp and fix one end of the crankshaft 20. The first servo motor is connected to the chuck 121 for driving the chuck 121 and the crankshaft 20 to rotate. The clamping mechanism 130 has a center point 131, which is located on the side facing the headstock mechanism 120 and can rotate on the clamping mechanism 130. After one end of the crankshaft 20 is clamped and fixed on the chuck 121, by driving the clamping mechanism 130 to move towards the headstock mechanism 120, the center point 131 can abut against the other end of the crankshaft 20 at the axis of the crankshaft 20, thereby clamping the crankshaft 20 between the headstock mechanism 120 and the clamping mechanism 130. The first servo motor drives the chuck 121 to drive the crankshaft 20 to rotate around its axis.

[0107] like Figure 2 As shown, the follower balancing mechanism 200 is mounted on the mounting plane 111 of the third mounting bracket 110 and is slidably connected to the third mounting bracket 110 along the length of the mounting plane 111. The induction heating mechanism 300 and the cooling mechanism 400 are mounted on the follower balancing mechanism 200. By sliding on the third mounting bracket 110, the follower balancing mechanism 200 can adjust the positions of the induction heating mechanism 300 and the cooling mechanism 400, moving them to the corresponding positions of the connecting rod journal 21 that needs to be quenched. Then, when the headstock mechanism 120 drives the crankshaft 20 to rotate, the follower balancing mechanism 200 drives the induction heating mechanism 300 and the cooling mechanism 400 to move with the rotation of the crankshaft 20, keeping the induction heating mechanism 300, the cooling mechanism 400, and the connecting rod journal 21 stationary.

[0108] Figure 3 for Figure 2 A schematic diagram of the structure of the follow-up balancing mechanism 200. (See diagram below.) Figure 3As shown, the follow-up balancing mechanism 200 includes a second mounting bracket 210 and a second servo motor 220. The second mounting bracket 210 is mounted on a third mounting bracket 110 and located on one side of the crankshaft 20. The second mounting bracket 210 and the third mounting bracket 110 are slidably connected along the length of the mounting plane 111. The second servo motor 220 is mounted at the lower part of the second mounting bracket 210. A gear is mounted on the drive shaft of the second servo motor 220, and a rack that meshes with the gear is provided on the third mounting bracket 110. Rotation of the second servo motor 220 can drive the second mounting bracket 210 to slide on the third mounting bracket 110.

[0109] like Figure 3 As shown, the follow-up balancing mechanism 200 also includes a slide plate 230 and a lifter 240. The slide plate 230 is mounted on the second mounting bracket 210, located on the side of the second mounting bracket 210 facing the crankshaft 20, and is slidably connected to the second mounting bracket 210 in the vertical direction. The lifter 240 is a hydraulic cylinder, mounted on the second mounting bracket 210, located above the slide plate 230. The lifter 240 has a vertically downward extending drive rod, the end of which is connected to the slide plate 230, and can drive the slide plate 230 to move up and down in the vertical direction.

[0110] like Figure 3 As shown, the follow-up balancing mechanism 200 also includes a counterweight 250, which is mounted on the second mounting bracket 210 and slidably connected to the second mounting bracket 210 in the vertical direction. A chain is provided at the upper end of the counterweight 250. After extending upwards, the chain is turned downwards at the upper position of the second mounting bracket 210 via a device such as a fixed pulley and then fixedly connected to the slide plate 230. Thus, the weight of the counterweight 250 can be converted into an upward pulling force on the slide plate 230 via the chain. The weight of the counterweight 250 is set slightly less than the sum of the weight of the slide plate 230 and the device mounted on the slide plate 230. This reduces the requirements on the lifting device 240, allowing the lifting device 240 to drive the slide plate 230 up and down with a smaller force.

[0111] like Figure 3As shown, the follow-up balancing mechanism 200 also includes an equipment bracket 260 and a hanging plate 270. The bracket 260 is horizontally positioned below the slide plate 230 and connected to the slide plate 230 via the hanging plates 270. Specifically, the bracket 260 has a generally square structure, and four hanging plates 270 are provided, located at the four corners of the bracket 260. The upper end of the hanging plate 270 is hinged to the slide plate 230, and the lower end is hinged to the bracket 260. The hanging plates 270 and the bracket 260 can swing freely in a plane perpendicular to the axis of the crankshaft 20. The hanging plates 270 are of equal length, and the hanging plates 270, the slide plate 230, and the bracket 260 form a parallelogram structure, ensuring that the bracket 260 remains horizontal during swinging. The induction heating device is mounted on the bracket 260 and is located below the bracket 260. As a result, the induction heating device can swing freely with the crankshaft 20 when it moves with the rotation of the crankshaft 20. At the same time, the parallelogram structure mentioned above can keep the posture of the induction heating device stable and keep it stationary with the connecting rod journal 21.

[0112] Figure 4 This is a schematic diagram of the induction heating mechanism 300 and the cooling mechanism 400. Figure 4 As shown, the induction heating mechanism 300 includes a first mounting bracket 310, a magnetic conductor 320, an induction coil, and a positioning block 330. The first mounting bracket 310 is saddle-shaped, with its top fixedly connected to a hanger 260. Its bottom has a notched quenching space 311 to accommodate the connecting rod journal 21. Viewed along the axial direction of the crankshaft 20, the quenching space 311 comprises upper and lower parts: the upper part is semi-circular, and the lower part is square. The magnetic conductor 320 has a finned structure and is fixed to the induction coil via an insertion connection. The induction coil is a fan-shaped, hollow coil with an internal cooling system connected to an external water channel. The magnetic conductor 320 is mounted on the first mounting bracket 310, surrounding the semi-circular portion of the quenching space 311.

[0113] Three positioning blocks 330 are provided and installed on the first mounting bracket 310, located at the top center of the semicircular portion and at the lower end of the semicircular portion where it connects to the square portion. One end of the positioning block 330 is shaped to fit the connecting rod journal 21 and extends into the quenching space 311. After the connecting rod journal 21 enters the quenching space 311, the three positioning blocks 330 abut against the outer circumferential surface of the connecting rod journal 21, maintaining a first gap in the radial direction between the connecting rod journal 21 and the induction coil. The first gap is 1% of the diameter of the connecting rod journal 21, and the uniformity of the first gap is 1±0.1mm. In addition, after the induction heating mechanism 300 is in place, a dynamic gap of 0.8-1.2mm is maintained between the magnetic conductor 320 and the crank 22 of the crankshaft 20.

[0114] During induction heating, a medium-frequency current is passed into the induction coil. The magnetic field is precisely constrained and focused onto the connecting rod journal 21 region using a three-dimensionally gradient-arranged magnetic conductor 320. Through electromagnetic induction, eddy currents are generated on the surface of the connecting rod journal 21, causing it to heat up rapidly. During this process, the induction heating mechanism 300 maintains a low temperature using its own circulating coolant system, while simultaneously spraying quenching fluid onto the induction coil through the upper sprayers 410 added to both shoulders, achieving radial synchronous cooling and completing the quenching process.

[0115] Figure 5 This is a control diagram for a real-time energy monitoring and pulsed power distribution regulation system. Figure 6 This is a schematic diagram of the power fluctuation curve for induction heating. Figure 6 The middle line represents the actual power, and the dashed line represents the power fluctuation range. Figure 7 This is a schematic diagram of the phase control range. (Example) Figures 5-7 As shown, the real-time energy monitoring and pulsed power distribution control system controls the induction heating mechanism 300. Specifically, the system monitors the voltage, current, frequency, and other process parameters of the induction heating system, and uses a programmable controller to calculate, collect, organize, and store multi-dimensional process parameters during the quenching process in real time. All data is displayed graphically on a touchscreen, including real-time output power curves, historical data queries, and alarm records. When the real-time monitored power exceeds the preset tolerance range (e.g., within ±5%), the system automatically triggers the adjustment mechanism to adjust the operating parameters in real time, achieving automatic correction and closed-loop control of the production process. For the asymmetrical structure of the crankshaft 20, a full rotation (360°) is divided into 18 independent phase control intervals in the circumferential direction. The position of the crankshaft 20 is determined by the rotation information obtained from the first servo motor. Using the "phase-power" table set in the program, when the first servo motor drives the crankshaft 20 to rotate to the corresponding phase, the system instantly switches and precisely distributes power according to the preset 18 power levels. Each power setting has an allowable fluctuation range to ensure that different heating energies are applied at different phase angles to compensate for the differences in heat absorption caused by geometric changes, thereby ensuring a consistent temperature rise rate throughout the circumference and improving quenching uniformity.

[0116] Figure 8 This is a schematic diagram showing the positions of the upper sprayer 410 and the lower sprayer 420. (See diagram below.) Figure 4 , Figure 8As shown, the cooling mechanism 400 is mounted on the first mounting bracket 310. The cooling mechanism 400 includes an upper sprayer 410 and a lower sprayer 420. Two upper sprayers 410 are provided, symmetrically positioned on opposite sides of the semicircular portion of the quenching space 311, for cooling the upper half of the connecting rod journal 21. Two lower sprayers 420 are provided, symmetrically positioned on opposite sides of the square portion of the quenching space 311, for cooling the lower half of the connecting rod journal 21. The upper sprayers 410 and lower sprayers 420 are inclined, facing towards the axis of the connecting rod journal 21.

[0117] The cooling mechanism 400 is controlled by a quenching medium performance constant maintenance system, which consists of a temperature control system, a concentration control system, a microbial control system, and a stirring system. During the quenching process of the crankshaft 20, the system can monitor the temperature, concentration, and microbial quantity of the quenching fluid in real time. Through heating, cooling, adding clean water, adding the original quenching medium, adding microbial inhibitors, and continuous stirring, the system maintains stable quenching medium quality, ensuring effective workpiece quenching and producing products with high precision, good stability, and excellent consistency.

[0118] Before quenching, the medium delivery valves remain closed, meaning the upper sprayer 410 and lower sprayer 420 are closed, and no quenching fluid is sprayed onto the connecting rod journal 21. When heating is complete and the quenching cooling stage begins, the system quickly opens the valves according to program instructions. The quenching fluid enters the upper sprayer 410 and lower sprayer 420 through the cooling water pipe. The upper sprayer 410 and lower sprayer 420 open simultaneously, and with the help of the follow-up balancing mechanism 200 and its auxiliary components, they move with the crankshaft 20 to achieve circumferential follow-up spraying. Throughout the spraying process, the system monitors the flow parameters in real time through the electrically controlled proportional valve and electromagnetic flowmeter configured in the quenching water circuit. Based on the preset values, the PID system automatically adjusts the valve opening to perform precise closed-loop control of the flow rate, ensuring that the quenching medium pressure, flow rate, concentration, and temperature remain constant during the cooling process. After cooling is complete, the system closes the valves, and the cooling mechanism 400 resets along with the induction heating mechanism 300, completing the entire spray cooling process.

[0119] Figure 9 This is a structural diagram of the support mechanism 500. (See diagram below.) Figure 2 , Figure 9 As shown, the support mechanism 500 is mounted on the second mounting plane 141 of the fifth mounting bracket 140 and is slidably connected to the fifth mounting bracket 140 along the length direction of the second mounting plane 141. Multiple support mechanisms 500 are provided, thereby enabling clamping and limiting of multiple connecting rod journals 21 of the crankshaft 20.

[0120] like Figure 9As shown, the support mechanism 500 includes a fourth mounting bracket 510, a support structure 520, a pressure head 530, and a third servo motor 540. The fourth mounting bracket 510 is mounted on the third mounting bracket 110 and is slidably connected to the third mounting bracket 110 along the length of the mounting plane 111. The third servo motor 540 is mounted on the fourth mounting bracket 510, and a gear is mounted on the drive shaft of the third servo motor 540. A rack meshing with the gear is provided on the third mounting bracket 110. Rotation of the third servo motor 540 drives the fourth mounting bracket 510 to slide on the third mounting bracket 110. The support structure 520 is mounted on the fourth mounting bracket 510 and is slidably connected to the fourth mounting bracket 510 in the vertical direction. The pressure head 530 is mounted on the fourth mounting bracket 510 via a lower pressure arm. The lower pressure arm is hinged to the fourth mounting bracket 510, allowing the lower pressure arm to rotate on the fourth mounting bracket 510, thereby allowing the pressure head 530 to approach or move away from the support structure 520. Therefore, the crankshaft 20 can be pressed down by the pressure head 530 and pressed and fixed on the support structure 520. Thus, during the quenching operation, the crankshaft 20 can be locked and fixed by the support mechanism 500 to limit the deformation of the crankshaft 20 and reduce the deformation of the crankshaft 20.

[0121] The crankshaft induction hardening equipment 10 described in this application can be divided into five basic processes during operation: loading, heating, cooling, unloading, and resetting. The heating and cooling processes are performed multiple times according to process requirements. Specific details are as follows:

[0122] Loading: During loading, the support mechanism 500 moves from the reset state to the designated station, the pressure head 530 opens, the chuck 121 opens to the maximum, the crankshaft 20 is placed in, the chuck 121 closes to clamp the crankshaft 20 workpiece, the clamping mechanism 130 moves towards the crankshaft 20 until the tip 131 presses against the crankshaft 20 workpiece, the support structure 520 moves upward and contacts the crankshaft 20, and then the pressure head 530 falls down to contact the crankshaft 20 and locks, completing the loading of the crankshaft 20 workpiece.

[0123] Heating: The second servo motor 220 drives the follow-up balancing mechanism 200 to move to a specific position, so that the induction heating mechanism 300 and the cooling structure stop above the workstation. The slide plate 230 adjusts its height so that the three positioning blocks 330 on the heating mechanism are fully in contact with the surface of the connecting rod journal 21 of the crankshaft 20, ensuring that the induction coil and the connecting rod journal 21 have high coaxiality and are spaced consistent with the shafts on both sides. The first servo motor starts to rotate, driving the crankshaft 20 to rotate through the chuck 121. The induction heating mechanism 300 heats in segments according to the process power. By rotating and segmenting the power, heating is achieved for different cross-sectional geometries, so that the temperature distribution is relatively uniform at the end of the heating process. Heating ends after all target depth positions are heated to the target temperature.

[0124] Cooling: The quenching fluid is prepared to the target concentration using external equipment and cooled to the required process temperature by an external cooling system. Once the power output of the induction heating mechanism 300 reaches the required process level, the induction heating mechanism 300 stops working, and the first servo motor drives the crankshaft 20 to rotate. The water pump starts working, pumping the quenching fluid into the cooling mechanism 400 to cool the heated area, completing the quenching process. Once the area to be processed cools to room temperature, the water pump stops working, and the first servo motor stops rotating.

[0125] Unloading: During unloading, the first servo motor stops, the lift 240 drives the slide 230 to adjust its height to the maximum, so that the induction heating mechanism 300 and the cooling mechanism 400 are removed from the crankshaft 20 workpiece 6. The second servo motor 220 drives the follow-up balancing mechanism 200 to move to the right. The clamping mechanism 130 drives the center 131 away from the crankshaft 20, the chuck 121 opens to the maximum, the pressure head 530 opens to the maximum, and the crankshaft 20 is removed. The unloading of the crankshaft 20 is completed.

[0126] Reset: During reset, the clamping mechanism 130 drives the pressure head 530 to move to the rightmost position. The pressure head 530 closes, the support structure 520 descends to its lowest point, the support mechanism 500 moves to the right side adjacent to the clamping mechanism 130, and the chuck 121 fully closes.

[0127] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present application has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A crankshaft induction hardening device, characterized in that, include: A bed, the bed being used to fix the crankshaft and drive the crankshaft to rotate; An induction heating mechanism is provided, wherein multiple phase control zones are uniformly arranged along the circumference of the connecting rod journal of the crankshaft, and the induction heating power of the multiple phase control zones is individually controlled when the connecting rod journal is induction heated; cranks are connected to both ends of the connecting rod journal, and multiple phase regions are uniformly arranged along the circumference of the connecting rod journal, wherein each phase region corresponds to one of the phase control zones, and the volume of the region corresponding to each phase region of the crank is positively correlated with the induction heating power of each phase control zone; A cooling mechanism that sprays quenching liquid onto the connecting rod journal in the circumferential direction around the connecting rod journal; A follow-up balancing mechanism is installed on the bed, and the induction heating mechanism and the cooling mechanism are installed on the follow-up balancing mechanism; when the crankshaft rotates, the follow-up balancing mechanism drives the induction heating mechanism and the cooling mechanism to move with the connecting rod journal.

2. The crankshaft induction hardening equipment according to claim 1, characterized in that, The follow-up balancing mechanism includes: A second mounting bracket is mounted on the bed frame; A slide plate is mounted on the second mounting bracket, located above the crankshaft, and slidably connected to the second mounting bracket in the vertical direction. The induction heating mechanism and the cooling mechanism are mounted on the slide plate and located below the slide plate. A lifting device is mounted on the second mounting frame and is connected to the slide plate in a transmission manner to drive the slide plate to move up and down.

3. The crankshaft induction hardening equipment according to claim 2, characterized in that, The follow-up balancing mechanism also includes: The counterweight is connected to the slide via a chain, and the weight of the counterweight applies an upward pulling force to the slide.

4. The crankshaft induction hardening equipment according to claim 3, characterized in that, The weight of the counterweight is less than the sum of the weights of the slide, the induction heating mechanism, and the cooling mechanism.

5. The crankshaft induction hardening equipment according to claim 2, characterized in that, The follow-up balancing mechanism also includes: A hanging plate, one end of which is hinged to the slide plate and the other end of which is hinged to the induction heating mechanism, so that the hanging plate swings in a plane perpendicular to the axis of the crankshaft; multiple hanging plates are provided, forming a parallelogram structure between the slide plate and the induction heating mechanism.

6. The crankshaft induction hardening equipment according to any one of claims 1-5, characterized in that, The induction heating mechanism includes: The first mounting bracket is saddle-shaped. The top of the first mounting bracket is connected to the follow-up balancing mechanism, and the bottom is provided with a notch-shaped quenching space to accommodate the connecting rod journal. A magnetic conductor is mounted on the first mounting bracket and arranged around the quenching space; An induction coil, the induction coil being wound around the magnetic conductor; A positioning block is mounted on the first mounting bracket. One end of the positioning block extends into the quenching space and abuts against the connecting rod journal, so that a first gap is maintained between the connecting rod journal and the induction coil in the radial direction of the connecting rod journal.

7. The crankshaft induction hardening equipment according to claim 6, characterized in that, The first clearance is 1% of the diameter of the connecting rod journal.

8. The crankshaft induction hardening equipment according to claim 6, characterized in that, A second gap is maintained between the magnetic conductor and the cranks at both ends of the connecting rod journal, the second gap being 0.8-1.2 mm.

9. The crankshaft induction hardening equipment according to claim 6, characterized in that, Multiple positioning blocks are provided, located on both sides and the top of the quenching space respectively.

10. The crankshaft induction hardening equipment according to any one of claims 1-5, characterized in that, The cooling mechanism includes a sprayer, and multiple sprayers are evenly arranged around the circumference of the connecting rod journal and are oriented towards the axis of the connecting rod journal.

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