A quenching device and quenching method for the internal fillet and journal of a marine engine crankshaft

Abstract

The present invention provides a quenching device and a quenching method for the internal fillet and journal of a marine engine crankshaft, which includes a first inductor and a second inductor. The first inductor includes a first induction coil with a semi-circular structure, and the second inductor includes a second induction coil with a semi-circular structure. It also includes a first upright frame for installing the first inductor and a second upright frame for installing the second inductor, and further includes an adjusting device for adjusting the distance between the first upright frame and the second upright frame. Under the action of the adjusting device, the first upright frame and the second upright frame move relatively, so that the first induction coil and the second induction coil move horizontally synchronously. The present invention can ensure that the displacement amounts of the first induction coil and the second induction coil entering the internal fillet of the crankshaft are the same, and at the same time, it can avoid the horizontal displacement of the first induction coil and the second induction coil during quenching, ensure that the quenching areas of the crankshaft journal and the internal fillet meet the requirements, and further ensure the position accuracy of the one-time quenching at the crankshaft journal and the internal fillet.

Description

Technical Field

[0001] The present invention relates to the technical field of crankshaft heat treatment, and particularly relates to a quenching device and a quenching method for inner fillets and journals of a marine engine crankshaft. Background Art

[0002] Most of the crankshafts used in marine engines are forged steel crankshafts, and there are also a small number of ductile iron crankshafts. In order to improve the fatigue strength of large crankshafts, steel crankshafts usually need to be quenched and tempered, and forged steel crankshafts with higher strength requirements also need to be quenched and strengthened on the journal surface + fillet. For high-strength marine engine crankshafts, unloading grooves, also known as internal fillets, are machined on the crankshaft journals. The fillets are recessed inward along the root of the journal groove. The internal fillets of each journal of the crankshaft need to be strengthened by medium-frequency quenching to increase the hardness at the internal fillets, thereby improving the fatigue strength and service life of the crankshaft.

[0003] Generally, the fillets on the crankshaft journals are external fillets, and the external fillets and journals can be heated simultaneously by medium-frequency induction. Since the internal fillets are in the journal grooves, it is impossible to complete the simultaneous heating and quenching of the internal arc and the journal by using the ordinary crankshaft induction quenching method. Using one inductor to heat the two-side fillets separately will leave a soft band on the journal, affecting the wear resistance and strength of the journal. Chinese Patent CN101899560A discloses a new internal fillet quenching process method for a crankshaft. The adopted solution is to use two sets of inductors. The inductors adopt an eccentric structure, and the effective coil of the inductor is in the shape of a rectangular half-circle. The two sets of inductors move downward simultaneously, and then move away from each other left and right. The effective coils of the inductors enter the internal fillets on both sides, forming a complete enclosing surface, so as to complete the quenching of the internal fillets and journals of the crankshaft at one time. Although the above patent can solve the problem of the soft band on the journal, the applicant finds that there are certain defects in the above process method. Specifically, the upper ends of the two sets of inductors in the above patent are respectively connected to a quenching transformer, and the two inductors are respectively driven by independent driving mechanisms to complete the up-and-down and left-and-right movements. Since the two inductors are independently controlled by the driving mechanisms when entering the internal fillets on both sides, there will be inconsistent displacement amounts of the two inductors entering the internal fillets, resulting in deviations in the quenching areas of the internal fillets and journals. At the same time, there is no positioning constraint in the horizontal direction between the two sets of inductors, and the two sets of inductors straddle the top of the crankshaft journal. During the rotation of the crankshaft, the two sets of inductors will swing during the rotation with the crankshaft, and further cause relative displacement of the two sets of inductors in the horizontal direction, further exacerbating the deviation of the quenching areas at the internal fillets and journals, and unable to ensure the position accuracy of the one-time quenching of the crankshaft journal and the internal fillets. Summary of the Invention

[0004] In view of this, the present invention provides a quenching device and a quenching method for the internal fillet and journal of a marine engine crankshaft to solve the problem of poor position accuracy of the one-time quenching at the journal and internal fillet of the crankshaft in the existing quenching device and process.

[0005] The technical solution of the present invention is realized as follows:

[0006] On the one hand, the present invention provides a quenching device for the internal fillet and journal of a marine engine crankshaft, which includes a first inductor and a second inductor. The first inductor includes a first induction coil with a semi-circular structure, and the second inductor includes a second induction coil with a semi-circular structure;

[0007] It also includes a first vertical frame for installing the first inductor and a second vertical frame for installing the second inductor. The first vertical frame and the second vertical frame are arranged vertically and parallel to each other;

[0008] The lower end of the first vertical frame is provided with a first installation opening facing downward. The first installation opening is semi-circular. The first induction coil is fixedly arranged in the first installation opening and faces downward. At least a part of the first induction coil extends out of the side of the first vertical frame away from the second vertical frame;

[0009] The lower end of the second vertical frame is provided with a second installation opening corresponding to the size and position of the first installation opening. The second induction coil is fixedly arranged in the second installation opening and faces downward. At least a part of the second induction coil extends out of the side of the second vertical frame away from the first vertical frame;

[0010] The first vertical frame and the second vertical frame are used to straddle the crankshaft journal through the first installation opening and the second installation opening. An adjusting device for adjusting the distance between the first vertical frame and the second vertical frame is arranged between the first vertical frame and the second vertical frame. Under the action of the adjusting device, the first vertical frame and the second vertical frame move relatively, so that the first induction coil and the second induction coil move horizontally synchronously.

[0011] On the basis of the above technical solution, preferably, the first vertical frame and the second vertical frame are movably connected by a plurality of pin shafts. The adjusting device is provided with multiple groups, which are respectively located between the outer edges of the first vertical frame and the second vertical frame. The adjusting device includes a first connecting piece, a second connecting piece and a positive and negative screw rod. The first connecting piece is fixedly connected to the outer edge of the first vertical frame, the second connecting piece is fixedly connected to the outer edge of the second vertical frame, and the positive and negative screw rod is horizontally arranged between the first connecting piece and the second connecting piece, and its two ends are respectively threadedly connected to the first connecting piece and the second connecting piece.

[0012] Based on the above technical solutions, preferably, the first vertical frame includes two first side plates that are parallel to each other and fixedly arranged at intervals. Three first positioning blocks are fixedly arranged between the two first side plates. One of the first positioning blocks is located at the top end of the first installation opening, and the other two first positioning blocks are respectively located at both ends of the opening of the first installation opening. The ends of the three first positioning blocks away from the first vertical frame protrude from the inner wall of the first induction coil; the second vertical frame includes two second side plates that are parallel to each other and fixedly arranged at intervals. Three second positioning blocks are fixedly arranged between the two second side plates. The positions of the three second positioning blocks in the second installation opening correspond horizontally to the first positioning blocks. The ends of the three second positioning blocks away from the second vertical frame protrude from the inner wall of the second induction coil.

[0013] Based on the above technical solutions, preferably, first water spraying boxes are respectively arranged at the lower ends of the first vertical frame. The two first water spraying boxes are centrosymmetric with respect to the center of the first installation hole. A first water spraying port communicating with the first installation opening is formed between the two first water spraying boxes; second water spraying boxes are respectively arranged at the lower ends of the second vertical frame. The second water spraying boxes correspond to the first water spraying boxes in position. A second water spraying port communicating with the second installation opening is formed between the two second water spraying boxes; the first water spraying boxes are located between the two first side plates. A number of first water spraying holes for cleaning in the direction of the first installation opening are arranged on the surface of the first water spraying box facing the first water spraying port; the second water spraying boxes are located between the two second side plates. A number of second water spraying holes for cleaning in the direction of the second installation opening are arranged on the surface of the second water spraying box facing the second water spraying port; quenching cooling pipes are respectively connected to the sides of the first water spraying box away from the first water spraying port and the sides of the second water spraying box away from the second water spraying port.

[0014] Based on the above technical solutions, preferably, the first induction coil includes two first effective coils that are centrosymmetric with respect to the center of the first installation opening. The two first effective coils are separated from each other by the first positioning block at the top end of the first installation opening; the second induction coil includes two second effective coils that are centrosymmetric with respect to the center of the second installation opening. The two second effective coils are separated from each other by the second positioning block at the top end of the second installation opening;

[0015] The first inductor further includes a first conductive bar assembly connected to the first induction coil. The first conductive bar assembly includes a first positive conductive bar, a first negative conductive bar, and a first series conductive bar. One ends of the two first effective coils are respectively connected to the first positive conductive bar and the first negative conductive bar, and the other two ends of the two first effective coils are connected to each other through the first series conductive bar;

[0016] The second inductor further includes a second conductive bar assembly connected to the second induction coil. The second conductive bar assembly includes a second positive conductive bar, a second negative conductive bar, and a second series conductive bar. One end of each of the two second effective coils is respectively connected to the second positive conductive bar and the first negative conductive bar, and the other two ends of the two second effective coils are connected through the second series conductive bar.

[0017] Further, preferably, an electrode assembly connected in parallel with the first inductor and the second inductor is further included. The electrode assembly includes a fixed seat and a conductive device. The fixed seat is movably arranged at the tops of the first vertical frame and the second vertical frame, and the first vertical frame and the second vertical frame can move horizontally relative to the fixed seat. The conductive device is arranged on the fixed seat and is connected in parallel with the first conductive bar assembly and the second conductive bar assembly, and the first conductive bar assembly and the second conductive bar assembly can move relative to the conductive device.

[0018] Furthermore, preferably, the conductive device includes a first electrode connector, a second electrode connector, a first drainage row, a second drainage row, a first conductive plate, a second conductive plate, a first connection block, and a second connection block. The first electrode connector and the second electrode connector are fixedly arranged on the top surface of the fixed seat. The first conductive plate and the second conductive plate are located below the fixed seat. The first drainage row and the second drainage row are fixedly arranged in the fixed seat. The upper end of the first drainage row is connected to the first electrode connector, and the lower end of the first drainage row is connected to the first conductive plate. The upper end of the second drainage row is connected to the second electrode connector, and the lower end of the second drainage row is connected to the second conductive plate. The first positive conductive bar and the second positive conductive bar are respectively movably connected to the first conductive plate through the first connection block, and the first negative conductive bar and the second negative conductive bar are respectively movably connected to the second conductive plate through the second connection block.

[0019] Based on the above technical solution, preferably, the first conductive bar assembly, the second conductive bar assembly, the first induction coil, and the second induction coil are hollow inside. A water return pipe is respectively connected to the first series conductive bar and the second series conductive bar. A cooling water channel communicating with the first conductive bar assembly and the second conductive bar assembly is arranged in the conductive device. Water inlet holes are respectively opened on the first electrode connector and the second electrode connector. Sealing members for sealing the cooling water channel are arranged between the first connection block and the first conductive plate and between the second connection block and the second conductive plate.

[0020] Based on the above technical solution, preferably, a magnetic field shielding plate is further arranged on the first induction coil and the second induction coil, and the shape of the magnetic field shielding plate is adapted to the shape of the first induction coil.

[0021] On the other hand, the present invention discloses a method for quenching the inner fillet and journal of a marine engine crankshaft, including the following steps:

[0022] S1. Close the first vertical stand and the second vertical stand, and bridge them across the crankshaft journal through the first mounting opening and the second mounting opening. Adjust the positions of the first vertical stand and the second vertical stand on the journal and center them;

[0023] S2. Use the adjusting device to synchronously separate the first vertical stand and the second vertical stand in opposite directions. The first vertical stand drives the first induction coil into the inner fillet on one side of the crankshaft journal, and the second vertical stand drives the second induction coil into the inner fillet on the other side of the crankshaft journal;

[0024] S3. The first inductor and the second inductor are connected through a transformer, and the transformer is connected in parallel with the two inductors. During the rotation of the crankshaft, the first induction coil and the second induction coil quench the crankshaft journal and the inner fillet at one time;

[0025] S4. After quenching, use the adjusting device to synchronously close the first vertical stand and the second vertical stand in opposite directions, and lift them upward to disengage from the crankshaft.

[0026] The present invention has the following beneficial effects compared with the prior art:

[0027] (1) For the quenching device disclosed in the present invention, by setting the first vertical stand and the second vertical stand that are vertically parallel, the first induction coil is fixed in the first mounting opening at the lower end of the first vertical stand, and the second induction coil is fixed in the second mounting opening at the lower end of the second vertical stand. And at least a part of the first induction coil extends out of the side of the first vertical stand away from the second vertical stand, and at least a part of the second induction coil extends out of the side of the second vertical stand away from the first vertical stand. During quenching, the first vertical stand and the second vertical stand are closed by the adjusting device, and then bridged across the crankshaft journal through the first mounting opening and the second mounting opening. Then, the first vertical stand and the second vertical stand are synchronously separated by the adjusting device. The first vertical stand drives the first induction coil into the inner fillet on one side of the crankshaft journal, and the second vertical stand drives the second induction coil into the inner fillet on the other side of the crankshaft journal. This process can ensure that the displacement amounts of the first induction coil and the second induction coil entering the inner fillet of the crankshaft are the same. At the same time, during the quenching process, the relative positions of the first vertical stand and the second vertical stand can be kept fixed through the adjusting device, thereby avoiding the horizontal displacement of the first induction coil and the second induction coil, ensuring that the quenching areas of the crankshaft journal and the inner fillet meet the requirements, and further ensuring the position accuracy of the one-time quenching at the crankshaft journal and the inner fillet;

[0028] (2) Adjust the distance between the first vertical stand and the second vertical stand through the positive and reverse screw rods, with a simple structure and convenient operation;

[0029] (3) By setting three first positioning blocks in the first mounting opening and three second positioning blocks in the second mounting opening, after the entire quenching device is bridged across the crankshaft journal, these first positioning blocks and second positioning blocks can be used for positioning on the crankshaft journal, and at the same time, it can also prevent the first inductor and the second inductor from contacting the crankshaft journal;

[0030] (4) By connecting the first inductor and the second inductor in parallel using a transformer, the consistency of the hardened layer of the inner fillet quenching on both sides of the crankshaft journal can be ensured.

[0031] (5) By providing a hollow inside the first conductive bar assembly, the second conductive bar assembly, the first induction coil, and the second induction coil, with water return pipes connected to the first series conductive bar and the second series conductive bar respectively, and a cooling water channel communicating with the first conductive bar assembly and the second conductive bar assembly provided inside the conductive device, and water inlet holes opened on the first electrode connector and the second electrode connector respectively, when the first induction coil and the second induction coil are connected in parallel for conduction, effective cooling of the first induction coil and the second induction coil can be achieved. The conductive and cooling structures of the induction coils are integrated into one, making the entire quenching device have a compact structure, light weight, and reduced space occupation.

[0032] (6) By providing a magnetic field shielding plate between the first induction coil and the second induction coil, the magnetic field eddy current between the first induction coil and the second induction coil can be blocked, avoiding uneven hardened layers on the surface of the crankshaft journal between the first induction coil and the second induction coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a three-dimensional structure schematic diagram of the inner fillet and journal quenching device for a marine engine crankshaft disclosed by the present invention;

[0035] Figure 2 It is an assembly structure schematic diagram of the inner fillet and journal quenching device for a marine engine crankshaft disclosed by the present invention and the crankshaft journal;

[0036] Figure 3 For Figure 2 the partial enlarged schematic diagram at A in

[0037] Figure 4 For Figure 2 the partial enlarged schematic diagram at B in

[0038] Figure 5 It is an assembly structure schematic diagram of the first support frame and the second support frame disclosed by the present invention;

[0039] Figure 6 It is an assembly structure schematic diagram of the first support frame and the second support frame disclosed by the present invention;

[0040] Figure 7 Schematic structural diagram of the first inductor disclosed in the present invention;

[0041] Figure 8 Schematic structural diagram of the second inductor disclosed in the present invention;

[0042] Figure 9 Schematic assembly structure diagram of the first inductor, the second inductor and the electrode assembly disclosed in the present invention;

[0043] Figure 10 Schematic structural diagram of the conductive device disclosed in the present invention;

[0044] Figure 11 Schematic plan view of the assembly structure of the quenching device and the crankshaft journal disclosed in the present invention;

[0045] Figure 12 Schematic plan view of the quenching state of the first inductor, the second inductor, the crankshaft journal and the inner fillet disclosed in the present invention; Description of the drawings:

[0047] 1. First inductor; 2. Second inductor; 11. First induction coil; 21. Second induction coil; 3. First support; 4. Second support; 30. First mounting opening; 40. Second mounting opening; 5. Adjusting device; 51. First connecting member; 52. Second connecting member; 53. Right and left screw; 31. First side plate; 32. First positioning block; 41. Second side plate; 42. Second positioning block; 33. First water spraying box; 43. Second water spraying box; 331. First water spraying hole; 431. Second water spraying hole; 6. Quenching cooling pipe; 111. First effective coil; 12. First conductive bar assembly; 121. First positive conductive bar; 122. First negative conductive bar; 123. First series conductive bar; 211. Second effective coil; 22. Second conductive bar assembly; 221. Second positive conductive bar; 222. Second negative conductive bar; 223. Second series conductive bar; 7. Electrode assembly; 71. Fixed seat; 72. Conductive device; 721. First electrode joint; 722. Second electrode joint; 723. First drainage bar; 724. Second drainage bar; 725. First conductive plate; 726. Second conductive plate; 727. First connecting block; 728. Second connecting block; 8. Return water pipe; 720. Water inlet hole; 9. Magnetic field shielding plate; S. Crankshaft. Detailed implementation manners

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0049] As Figure 1 shown, in combination with Figures 2 - 5 , an embodiment of the present invention discloses a quenching device for the inner fillet and journal of a marine engine crankshaft, which is used to quench the surface of the crankshaft journal and the inner fillets on both sides of the journal.

[0050] Specifically, the quenching device disclosed in the embodiment of the present invention includes a first inductor 1 and a second inductor 2. Since the crankshaft of a marine engine is huge in volume and the inductor cannot be sleeved on the crankshaft, for this reason, the solution adopted in this embodiment is to set the structures of the first inductor 1 and the second inductor 2. Among them, the first inductor 1 includes a first induction coil 11 with a semi-circular structure, and the second inductor 2 includes a second induction coil 21 with a semi-circular structure; with this setting, the first induction coil 11 and the second induction coil 21 with semi-circular structures can be bridged on the surface of the crankshaft journal, and the crankshaft is driven to rotate by a rotating mechanism, so as to realize the quenching of the surface of the crankshaft by the first induction coil 11 and the second induction coil 21.

[0051] Since two inductors are provided in the prior art, each is connected to a quenching transformer, and then the quenching transformer is respectively driven to rise or move left and right by a lift translation mechanism to drive the two inductors to descend and insert into the crankshaft journal, and the two inductors are respectively driven to move left and right by a driving mechanism to make the inductors enter the inner fillets on both sides of the crankshaft journal. In the above structure and operation mode, since the two inductors are respectively horizontally moved, the displacement amounts of the two inductors entering the inner fillet will be inconsistent, resulting in deviations in the quenching areas of the inner fillet and the journal. At the same time, there is no positioning constraint between the two sets of inductors in the horizontal direction, and the two sets of inductors straddle the top of the crankshaft journal. During the rotation of the crankshaft, the two sets of inductors will swing during the rotation with the crankshaft, and further cause relative displacement of the two sets of inductors in the horizontal direction, further aggravating the deviation of the quenching area at the inner fillet and the journal, and it is impossible to ensure the position accuracy of the one-time quenching at the crankshaft journal and the inner fillet.

[0052] Therefore, in order to solve the above problems, the present invention adopts the following technical means.

[0053] The present invention discloses a first vertical frame 3 and a second vertical frame 4, which are vertically and parallelly arranged and are respectively used to install the first inductor 1 and the second inductor 2.

[0054] The lower end of the first vertical frame 3 is provided with a first installation opening 30 with a downward opening. The first installation opening 30 is in a semi-circular arc shape. The first induction coil 11 is fixedly arranged in the first installation opening 30 and has a downward opening. In this embodiment, the radius of the first installation opening 30 is greater than the radius of the first induction coil 11, and at the same time, the inner diameter of the first induction coil 11 matches the diameter of the crankshaft journal.

[0055] The lower end of the second vertical frame 4 is provided with a second installation opening 40 corresponding to the size and position of the first installation opening 30. The second induction coil 21 is fixedly arranged in the second installation opening 40 and has a downward opening. In this embodiment, the radius of the second installation opening 40 is greater than the radius of the second induction coil 21, and at the same time, the inner diameter of the second induction coil 21 matches the diameter of the crankshaft journal.

[0056] Through the above structural settings, the first induction coil 11 can be fixed at the arc-shaped opening at the lower end of the first vertical frame 3, and the second induction coil 21 can be fixed at the arc-shaped opening at the lower end of the second vertical frame 4. Moreover, the first induction coil 11 and the second induction coil 21 are horizontally aligned, and the openings of both induction coils are vertically downward.

[0057] In order to enable the first induction coil 11 and the second induction coil 21 to horizontally move into the inner fillets on both sides of the crankshaft journal, in this embodiment, an adjusting device 5 for adjusting the distance between the first vertical frame 3 and the second vertical frame 4 is provided between the first vertical frame 3 and the second vertical frame 4. Under the action of the adjusting device 5, the first vertical frame 3 and the second vertical frame 4 move relative to each other, so that the first induction coil 11 and the second induction coil 21 move horizontally synchronously.

[0058] In this embodiment, at least a part of the first induction coil 11 extends out of the side of the first upright 3 away from the second upright 4; at least a part of the second induction coil 21 extends out of the side of the second upright 4 away from the first upright 3. With such an arrangement, in the specific implementation process, the first upright 3 and the second upright 4 are closed by the adjusting device 5, and then are bridged on the crankshaft journal through the first mounting port 30 and the second mounting port 40. Then, the first upright 3 and the second upright 4 are synchronously separated by the adjusting device 5. The first upright 3 drives the first induction coil 11 to move towards one side of the crankshaft journal, and the second upright 4 drives the second induction coil 21 to move towards the other side of the crankshaft journal. Since the first induction coil 11 protrudes from the outer wall of the first upright 3 and the second induction coil 21 protrudes from the outer wall of the second upright 4, thus, when the first upright 3 and the second upright 4 are relatively separated to an appropriate position, the first induction coil 11 can enter the inner fillet on one side of the crankshaft journal, and the second induction coil can enter the inner fillet on the other side of the crankshaft journal. This process can ensure that the displacement amounts of the first induction coil 11 and the second induction coil 21 entering the inner fillet of the crankshaft are the same. At the same time, during the quenching process, the relative positions of the first upright 3 and the second upright 4 can be kept fixed through the adjusting device 5, thereby avoiding horizontal displacement of the first induction coil 11 and the second induction coil 21, ensuring that the quenching areas of the crankshaft journal and the inner fillet meet the requirements, and further ensuring the position accuracy of the one-time quenching at the crankshaft journal and the inner fillet.

[0059] In order to make the distance between the first upright frame 3 and the second upright frame 4 adjustable and be in a movable connection with each other at the same time, in this embodiment, a movable connection is adopted between the first upright frame 3 and the second upright frame 4 through a plurality of pin shafts. Thus, the first upright frame 3 and the second upright frame 4 can be horizontally adjusted. In order to make the first upright frame 3 and the second upright frame 4 move closer or separate synchronously, the solution adopted in this embodiment is to arrange a plurality of groups of adjusting devices 5 between the outer edges of the first upright frame 3 and the second upright frame 4. Preferably, adjusting devices 5 are arranged on both sides and the top in the width direction of the first upright frame 3 and the second upright frame 4. Specifically, the adjusting device 5 in this embodiment includes a first connecting piece 51, a second connecting piece 52 and a positive and negative screw rod 53. The first connecting piece 51 is fixedly connected to the outer edge of the first upright frame 3, the second connecting piece 52 is fixedly connected to the outer edge of the second upright frame 4, and the positive and negative screw rod 53 is horizontally arranged between the first connecting piece 51 and the second connecting piece 52, and its two ends are respectively threadedly connected to the first connecting piece 51 and the second connecting piece 52. With such an arrangement, by rotating the positive and negative screw rod 53, positive and negative threaded rotation actions occur with the first connecting piece 51 and the second connecting piece 52, so that the first upright frame 3 and the second upright frame 4 are kept closing or separating synchronously. The adjusting device 5 has a simple structure and is convenient to operate. In order to prevent the positive and negative screw rod 53 from rotating automatically due to vibration during the quenching process, after the distance between the first upright frame 3 and the second upright frame 4 is adjusted, a stop block can be inserted between the first upright frame 3 and the second upright frame 4 to prevent the two from moving relative to each other, so as to ensure the position accuracy of the first induction coil 11 and the second induction coil 21 during the quenching process.

[0060] Since the crankshaft journal has a groove structure and has a certain grooving width, the widths of the first upright frame 3 and the second upright frame 4 cannot be too wide, otherwise they cannot be inserted into the groove of the crankshaft journal. For this reason, some structural settings are made for the first upright frame 3 and the second upright frame 4 in this embodiment. Specifically, the first upright frame 3 includes two first side plates 31 that are parallel to each other and fixedly arranged at intervals, and the second upright frame 4 includes two second side plates 41 that are parallel to each other and fixedly arranged at intervals. The distance between the two first side plates 31 is substantially equivalent to the width of the first induction coil 11, and the distance between the two second side plates 41 is substantially equivalent to the width of the second induction coil 21. With such an arrangement, the first induction coil 11 can be fixed in the first installation opening 30 below the two first side plates 31, and the second induction coil 21 can be fixed in the second installation opening 40 below the two second side plates 41. At the same time, other conductive and waterway pipe fittings on the inductor can also be arranged between the two first side plates 31 and the two second side plates 41, so that the inductor structure in the entire quenching device is integrated onto the first upright frame 3 and the second upright frame 4, avoiding being exposed outside the first upright frame 3 and the second upright frame 4 and causing interference to the crankshaft or other mechanisms during the quenching process.

[0061] Since the first induction coil 11 is installed in the first installation opening 30 and the second induction coil 21 is installed in the second installation opening 40, during the quenching process, it is necessary to connect the first induction coil 11 and the second induction coil 21 across the crankshaft journal, but at the same time, it is necessary to prevent the first induction coil 11 and the second induction coil 21 from contacting the surface of the crankshaft journal.

[0062] For this reason, in this embodiment, three first positioning blocks 32 are fixedly arranged between the two first side plates 31. One of the first positioning blocks 32 is located at the top end of the first installation opening 30, and the other two first positioning blocks 32 are respectively located at both ends of the opening of the first installation opening 30. The ends of the three first positioning blocks 32 away from the first stand 3 protrude from the inner wall of the first induction coil 11. Three second positioning blocks 42 are fixedly arranged between the two second side plates 41. The positions of the three second positioning blocks 42 in the second installation opening 40 correspond horizontally to the first positioning blocks 32. The ends of the three second positioning blocks 42 away from the second stand 4 protrude from the inner wall of the second induction coil 21.

[0063] With this setting, through the arrangement of the three first positioning blocks 32 and the three second positioning blocks 42, after the quenching device is inserted onto the crankshaft journal, the above positioning blocks can directly contact and position with the crankshaft journal, avoiding direct contact between the first inductor 1 and the second inductor 2 and the crankshaft journal and causing arcing.

[0064] At the same time, the arrangement of the three first positioning blocks 32 and the three second positioning blocks 42 also has the following purpose. Refer to the attached Figure 11 and 12 As shown, specifically, when quenching the crankshaft journal by the quenching device of the present invention, the first stand 3 and the second stand 4 are closed and connected across the crankshaft journal through the first installation opening 30 and the second installation opening 40. Adjust the positions of the first stand 3 and the second stand 4 on the journal and center them. It can be done by visual inspection. After the first stand 3 and the second stand 4 are integrally in the center position of the crankshaft journal, the first stand 3 and the second stand 4 are separated left and right by the adjusting device 5. When the side walls of the three first positioning blocks 32 on the first stand 3 contact the groove wall on one side of the crankshaft, since at least a part of the first induction coil 11 extends out of the outer wall of the first stand 3, therefore, the extended part of the first induction coil 11 will be inserted into the inner fillet on one side of the crankshaft. In this embodiment, the width of the part of the first induction coil 11 extending out of the outer wall of the first stand 3 is adapted to the width of the inner fillet of the crankshaft that needs to be quenched. Thus, when the first positioning block 32 contacts the groove wall of the crankshaft journal, it means that the first induction coil 11 enters the inner fillet on one side of the crankshaft, so that the displacement amount can be accurately controlled, and the quenching area of the first induction coil 11 in the inner fillet meets the process requirements, and the accuracy can be guaranteed. Similarly, the principle of the second inductor 2 is the same as that of the first inductor 1.

[0065] During the quenching process, the crankshaft journal is located in the first mounting opening 30 and the second mounting opening 40. In order to cool the surface of the crankshaft during the quenching process, refer to the attached Figure 6 As shown, in this embodiment, first water spray boxes 33 are respectively arranged at the lower ends of the first vertical frames 3. The two first water spray boxes 33 are symmetrically centered on the first mounting hole. A first water spray opening communicating with the first mounting opening 30 is formed between the two first water spray boxes 33; second water spray boxes 43 are respectively arranged at the lower ends of the second vertical frames 4. The second water spray boxes 43 correspond to the positions of the first water spray boxes 33. A second water spray opening communicating with the second mounting opening 40 is formed between the two second water spray boxes 43; the first water spray box 33 is located between two first side plates 31. A number of first water spray holes 331 for cleaning in the direction of the first mounting opening 30 are arranged on the side of the first water spray box 33 facing the first water spray opening; the second water spray box 43 is located between two second side plates 41. A number of second water spray holes 431 for cleaning in the direction of the second mounting opening 40 are arranged on the side of the second water spray box 43 facing the second water spray opening; quenching cooling pipes 6 are respectively connected to the sides of the first water spray box 33 away from the first water spray opening and the sides of the second water spray box 43 away from the second water spray opening.

[0066] With such a setting, cooling water is respectively introduced into the two first water spray boxes 33 and the two second water spray boxes 43 through the quenching cooling pipes 6. The cooling water is sprayed obliquely upward into the first water spray opening and the second water spray opening from the first water spray holes 331 and the second water spray holes 431, so as to realize quenching and cooling of the surface of the crankshaft journal.

[0067] Since a first positioning block 32 is fixedly arranged above the first mounting opening 30, and a second positioning block 42 is fixedly arranged above the second mounting opening 40. At the same time, the first positioning block 32 needs to be higher than the first induction coil 11, and the second positioning block 42 needs to be higher than the second induction coil 21. Therefore, the embodiment of the present invention adopts the following method to solve this problem. Specifically, the first induction coil 11 includes two first effective coils 111 that are symmetrically centered on the first mounting opening 30. The two first effective coils 111 are separated from each other by the first positioning block 32 at the top end of the first mounting opening 30; the second induction coil 21 includes two second effective coils 211 that are symmetrically centered on the second mounting opening 40. The two second effective coils 211 are separated from each other by the second positioning block 42 at the top end of the second mounting opening 40.

[0068] In order to connect the two first effective coils 111 in series to form a conductive loop, the solution adopted in this embodiment is: refer to the attached Figure 7 and 8As shown in the figure, the first inductor 1 further includes a first conductive bar assembly 12 connected to the first induction coil 11. The first conductive bar assembly 12 includes a first positive conductive bar 121, a first negative conductive bar 122, and a first series conductive bar 123. One end of each of the two first effective coils 111 is respectively connected to the first positive conductive bar 121 and the first negative conductive bar 122, and the other two ends of the two first effective coils 111 are connected through the first series conductive bar 123. With this arrangement, the two first effective coils 111 are connected in series through the first series conductive bar 123, and the other two ends of the two first effective coils 111 are respectively used to introduce high-frequency current through the first positive conductive bar 121 and the first negative conductive bar 122.

[0069] In order to connect the two second effective coils 211 in series to form a conductive loop, the solution adopted in this embodiment is: the second inductor 2 further includes a second conductive bar assembly 22 connected to the second induction coil 21. The second conductive bar assembly 22 includes a second positive conductive bar 221, a second negative conductive bar 222, and a second series conductive bar 223. One end of each of the two second effective coils 211 is respectively connected to the second positive conductive bar 221 and the second negative conductive bar 222, and the other two ends of the two second effective coils 211 are connected through the second series conductive bar 223. With this arrangement, the two second effective coils 211 are connected in series through the second series conductive bar 223, and the other two ends of the two second effective coils 211 are respectively used to introduce high-frequency current through the second positive conductive bar 221 and the second negative conductive bar 222.

[0070] In the above embodiment, the first conductive bar assembly 12, the second conductive bar assembly 22, the first effective coil 111, and the second effective coil 211 are all made of copper, with high conductivity and strong heat dissipation.

[0071] Since the first induction coil 11 and the second induction coil 21 need to perform quenching treatment on the inner fillets on both sides of the crankshaft respectively, if the first induction coil 11 and the second induction coil 21 are connected in series, the hardness layers at the two inner fillets after quenching will be uneven. For this reason, in this embodiment, the first induction coil 11 and the second induction coil 21 are connected to the quenching transformer in parallel. Specifically, refer to the appendix Figure 9 and 10As shown in the figure, in this embodiment, by setting the electrode assembly 7, a parallel connection with the first inductor and the second inductor 2 is achieved. The electrode assembly 7 includes a fixed seat 71 and a conductive device 72. The fixed seat 71 is movably arranged at the tops of the first vertical frame 3 and the second vertical frame 4, and the first vertical frame 3 and the second vertical frame 4 can move horizontally relative to the fixed seat 71. The conductive device 72 is arranged on the fixed seat 71 and is connected in parallel with the first conductive busbar assembly 12 and the second conductive busbar assembly 22, and the first conductive busbar assembly 12 and the second conductive busbar assembly 22 can move relative to the conductive device 72. With this setting, since the first inductor 11 and the second inductor 21 are respectively fixed on the first vertical frame 3 and the second vertical frame 4, and the upper end of the first inductor 11 is connected to the first conductive busbar assembly 12, and the upper end of the second inductor 21 is connected to the second conductive busbar assembly 22, therefore, both the first conductive busbar assembly 12 and the second conductive busbar assembly 22 need to be movably connected to the conductive device 72. When adjusting the distance between the first vertical frame 3 and the second vertical frame 4, it is also necessary to adjust the connection relationship between the first conductive busbar assembly 12 and the second conductive busbar assembly 22 and the conductive device 72.

[0072] Specifically, the conductive device 72 in this embodiment includes a first electrode connector 721, a second electrode connector 722, a first drainage row 723, a second drainage row 724, a first conductive plate 725, a second conductive plate 726, a first connection block 727 and a second connection block 728. The first electrode connector 721 and the second electrode connector 722 are fixedly arranged on the top surface of the fixed seat 71. The first conductive plate 725 and the second conductive plate 726 are located below the fixed seat 71. The first drainage row 723 and the second drainage row 724 are fixedly arranged in the fixed seat 71. The upper end of the first drainage row 723 is connected to the first electrode connector 721, and the lower end of the first drainage row 723 is connected to the first conductive plate 725. The upper end of the second drainage row 724 is connected to the second electrode connector 722, and the lower end of the second drainage row 724 is connected to the second conductive plate 726. The first positive conductive busbar 121 and the second positive conductive busbar 221 are respectively movably connected to the first conductive plate 725 through the first connection block 727, and the first negative conductive busbar 122 and the second negative conductive busbar 222 are respectively movably connected to the second conductive plate 726 through the second connection block 728. With this setting, the first electrode connector 721 and the second electrode connector 722 are respectively connected to the quenching transformer. The first electrode connector 721 passes the positive current through the first drainage row 723 and the first conductive plate 725 into the first inductor 11 through the first positive conductive busbar 121 and the second positive conductive busbar 221 respectively. The second electrode connector 722 passes the negative current through the second drainage row 724 and the second conductive plate 726 into the first inductor 11 through the first negative conductive busbar 122 and the second negative conductive busbar 222 respectively, so as to realize the parallel connection of the first inductor 11 and the second inductor 21 and share a quenching transformer, making the entire quenching device simple in structure and convenient to operate.

[0073] In this embodiment, between the first connecting block 727 and the first conductive plate 725, horizontal adjustability is achieved through the connection method of a strip-shaped hole plus bolts. Similarly, between the second connecting block 728 and the second conductive plate 726, horizontal adjustability is achieved through the connection method of a strip-shaped hole plus bolts.

[0074] In order to cool the first induction coil 11 and the second induction coil 21 during the quenching process, the solution adopted in this embodiment is that the first conductive busbar assembly 12, the second conductive busbar assembly 22, the first induction coil 11 and the second induction coil 21 are hollow inside. A water return pipe 8 is respectively connected to the first series conductive busbar 123 and the second series conductive busbar 223. A cooling water channel communicating with the first conductive busbar assembly 12 and the second conductive busbar assembly 22 is arranged inside the conductive device 72. Water inlet holes 720 are respectively opened on the first electrode connector 721 and the second electrode connector 722. With such a setting, when the first induction coil 11 and the second induction coil 21 are in parallel conduction, effective cooling of the first induction coil 11 and the second induction coil 21 can be achieved. The conduction and cooling structures of the induction coils are integrated into one, making the entire quenching device have a compact structure, a light volume, and reduced space occupation.

[0075] Sealing members for sealing the cooling water channel are arranged between the first connecting block 727 and the first conductive plate 725, and between the second connecting block 728 and the second conductive plate 726. When the relative positions of the first connecting block 727 and the first conductive plate 725 are adjusted, and when the relative positions of the second connecting block 728 and the second conductive plate 726 are adjusted, the cooling water channel can be sealed by the sealing members to avoid leakage of cooling water.

[0076] Due to the strong magnetic field eddy current between the first induction coil 11 and the second induction coil 21, in the case where the crankshaft journal groove is relatively narrow, the magnetic field eddy currents on the first induction coil 11 and the second induction coil 21 overlap each other, and there will be an excessively thick hardened layer in the middle of the crankshaft journal after quenching, resulting in uneven hardened layers with other regions. For this reason, in this embodiment, a magnetic field shielding plate 9 is further arranged on the first induction coil 11 and the second induction coil 21, and the magnetic field eddy current between the first induction coil 11 and the second induction coil 21 can be blocked by the magnetic field shielding plate 9 to avoid uneven surface hardening of the crankshaft journal between the first induction coil 11 and the second induction coil 21.

[0077] The present invention also discloses a method for quenching the inner fillet and journal of a marine engine crankshaft, including the following steps:

[0078] S1. Close the first upright frame 3 and the second upright frame 4, straddle the crankshaft journal through the first mounting opening 30 and the second mounting opening 40, and adjust the positions of the first upright frame 3 and the second upright frame 4 on the journal and center them;

[0079] S2. Use the adjusting device 5 to synchronously separate the first upright frame 3 and the second upright frame 4 in opposite directions. The first upright frame 3 drives the first induction coil 11 into the inner fillet on one side of the crankshaft journal, and the second upright frame 4 drives the second induction coil 21 into the inner fillet on the other side of the crankshaft journal;

[0080] S3. The first inductor 1 and the second inductor 2 are connected through a transformer, and the transformer is connected in parallel with the two inductors. During the rotation of the crankshaft, the first induction coil 11 and the second induction coil 21 quench the crankshaft journal and the inner fillet at one time;

[0081] S4. After quenching is completed, use the adjusting device 5 to synchronously close the first upright frame 3 and the second upright frame 4 in opposite directions and lift them upward to disengage from the crankshaft.

[0082] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quenching device for the inner fillet and journal of a marine engine crankshaft, which comprises a first inductor (1) and a second inductor (2). The first inductor (1) includes a first induction coil (11) having a semi-circular structure, and the second inductor (2) includes a second induction coil (21) having a semi-circular structure; It is characterized in that: It further includes a first vertical frame (3) for mounting the first inductor (1) and a second vertical frame (4) for mounting the second inductor (2). The first vertical frame (3) and the second vertical frame (4) are arranged vertically and parallel to each other; A first mounting opening (30) with a downward opening is formed at the lower end of the first vertical frame (3). The first mounting opening (30) is semi-circular in shape. The first induction coil (11) is fixedly arranged in the first mounting opening (30) and has a downward opening. At least a part of the first induction coil (11) extends out of the side of the first vertical frame (3) away from the second vertical frame (4); A second mounting opening (40) corresponding to the first mounting opening (30) in size and position is formed at the lower end of the second vertical frame (4). The second induction coil (21) is fixedly arranged in the second mounting opening (40) and has a downward opening. At least a part of the second induction coil (21) extends out of the side of the second vertical frame (4) away from the first vertical frame (3); The first vertical frame (3) and the second vertical frame (4) are used to straddle the crankshaft journal through the first mounting opening (30) and the second mounting opening (40). An adjusting device (5) for adjusting the distance between the first vertical frame (3) and the second vertical frame (4) is arranged between the first vertical frame (3) and the second vertical frame (4). Under the action of the adjusting device (5), the first vertical frame (3) and the second vertical frame (4) move relatively, so that the first induction coil (11) and the second induction coil (21) move horizontally synchronously; The first vertical frame (3) includes two first side plates (31) which are parallel to each other and fixedly arranged at intervals. Three first positioning blocks (32) are fixedly arranged between the two first side plates (31). One of the first positioning blocks (32) is located at the top end of the first mounting opening (30), and the other two first positioning blocks (32) are respectively located at both ends of the opening of the first mounting opening (30). The ends of the three first positioning blocks (32) away from the first vertical frame (3) protrude from the inner wall of the first induction coil (11); The second vertical frame (4) includes two second side plates (41) which are parallel to each other and fixedly arranged at intervals. Three second positioning blocks (42) are fixedly arranged between the two second side plates (41). The positions of the three second positioning blocks (42) in the second mounting opening (40) are horizontally corresponding to those of the first positioning blocks (32). The ends of the three second positioning blocks (42) away from the second vertical frame (4) protrude from the inner wall of the second induction coil (21); The first induction coil (11) includes two first effective coils (111) that are centrosymmetric with respect to the center of the first mounting opening (30), and the two first effective coils (111) are separated from each other by a first positioning block (32) at the top of the first mounting opening (30); the second induction coil (21) includes two second effective coils (211) that are centrosymmetric with respect to the center of the second mounting opening (40), and the two second effective coils (211) are separated from each other by a second positioning block (42) at the top of the second mounting opening (40). The first inductor (1) further includes a first conductive busbar assembly (12) connected to the first induction coil (11). The first conductive busbar assembly (12) includes a first positive conductive busbar (121), a first negative conductive busbar (122), and a first series conductive busbar (123). One end of each of the two first effective coils (111) is connected to the first positive conductive busbar (121) and the first negative conductive busbar (122) respectively, and the other two ends of the two first effective coils (111) are connected to each other through the first series conductive busbar (123). The second inductor (2) further includes a second conductive busbar assembly (22) connected to the second induction coil (21). The second conductive busbar assembly (22) includes a second positive conductive busbar (221), a second negative conductive busbar (222), and a second series conductive busbar (223). One end of each of the two second effective coils (211) is connected to the second positive conductive busbar (221) and the first negative conductive busbar (122) respectively, and the other two ends of the two second effective coils (211) are connected to each other through the second series conductive busbar (223).

2. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 1, characterized in that: The first upright frame (3) and the second upright frame (4) are movably connected by a plurality of pin shafts. A plurality of sets of adjusting devices (5) are provided between the outer edges of the first upright frame (3) and the second upright frame (4). The adjusting device (5) includes a first connecting member (51), a second connecting member (52), and a positive and negative screw rod (53). The first connecting member (51) is fixedly connected to the outer edge of the first upright frame (3), the second connecting member (52) is fixedly connected to the outer edge of the second upright frame (4), and the positive and negative screw rod (53) is horizontally arranged between the first connecting member (51) and the second connecting member (52), and its two ends are respectively threadedly connected to the first connecting member (51) and the second connecting member (52).

3. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 1, characterized in that: The lower ends of the first vertical frames (3) are respectively provided with first water spraying boxes (33). The two first water spraying boxes (33) are centrosymmetric with respect to the center of the first mounting hole. A first water spraying port communicating with the first mounting opening (30) is formed between the two first water spraying boxes (33). The lower ends of the second vertical frames (4) are respectively provided with second water spraying boxes (43). The second water spraying boxes (43) correspond to the positions of the first water spraying boxes (33). A second water spraying port communicating with the second mounting opening (40) is formed between the two second water spraying boxes (43). The first water spraying box (33) is located between two first side plates (31). A plurality of first water spraying holes (331) for cleaning in the direction of the first mounting opening (30) are arranged on the surface of the first water spraying box (33) facing the first water spraying port. The second water spraying box (43) is located between two second side plates (41). A plurality of second water spraying holes (431) for cleaning in the direction of the second mounting opening (40) are arranged on the surface of the second water spraying box (43) facing the second water spraying port. Quenching cooling pipes (6) are respectively connected to the sides of the first water spraying box (33) far from the first water spraying port and the sides of the second water spraying box (43) far from the second water spraying port.

4. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 1, characterized in that: It further includes an electrode assembly (7) connected in parallel with the first inductor and the second inductor (2). The electrode assembly (7) includes a fixed seat (71) and a conductive device (72). The fixed seat (71) is movably arranged at the tops of the first vertical frame (3) and the second vertical frame (4), and the first vertical frame (3) and the second vertical frame (4) can move horizontally relative to the fixed seat (71). The conductive device (72) is arranged on the fixed seat (71) and is connected in parallel with the first conductive bar assembly (12) and the second conductive bar assembly (22), and the first conductive bar assembly (12) and the second conductive bar assembly (22) can move relative to the conductive device (72).

5. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 4, characterized in that: The conductive device (72) includes a first electrode joint (721), a second electrode joint (722), a first drainage row (723), a second drainage row (724), a first conductive plate (725), a second conductive plate (726), a first connection block (727) and a second connection block (728). The first electrode joint (721) and the second electrode joint (722) are fixedly arranged on the top surface of the fixed seat (71). The first conductive plate (725) and the second conductive plate (726) are located below the fixed seat (71). The first drainage row (723) and the second drainage row (724) are fixedly arranged in the fixed seat (71). The upper end of the first drainage row (723) is connected to the first electrode joint (721), and the lower end of the first drainage row (723) is connected to the first conductive plate (725). The upper end of the second drainage row (724) is connected to the second electrode joint (722), and the lower end of the second drainage row (724) is connected to the second conductive plate (726). The first positive conductive row (121) and the second positive conductive row (221) are respectively movably connected to the first conductive plate (725) through the first connection block (727), and the first negative conductive row (122) and the second negative conductive row (222) are respectively movably connected to the second conductive plate (726) through the second connection block (728).

6. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 5, characterized in that: The first conductive row assembly (12), the second conductive row assembly (22), the first induction coil (11) and the second induction coil (21) are hollow inside. A water return pipe (8) is respectively connected to the first series conductive row (123) and the second series conductive row (223). A cooling water channel communicating with the first conductive row assembly (12) and the second conductive row assembly (22) is arranged in the conductive device (72). Water inlet holes (720) are respectively opened on the first electrode joint (721) and the second electrode joint (722). Sealing members for sealing the cooling water channel are arranged between the first connection block (727) and the first conductive plate (725), and between the second connection block (728) and the second conductive plate (726).

7. The quenching device for the internal fillet and journal of a marine engine crankshaft according to claim 1, characterized in that: The first induction coil (11) and the second induction coil (21) are further provided with a magnetic field shielding plate (9), and the shape of the magnetic field shielding plate (9) is adapted to the shape of the first induction coil (11).

8. A quenching method for the internal fillet and journal of a marine engine crankshaft, which utilizes the quenching device for the internal fillet and journal of the marine engine crankshaft described in any one of claims 1 to 7, characterized in that, It includes the following steps: S1. Close the first stand (3) and the second stand (4), straddle the crankshaft journal through the first mounting opening (30) and the second mounting opening (40), and adjust the positions of the first stand (3) and the second stand (4) on the journal and center them; S2. Synchronously and oppositely separate the first stand (3) and the second stand (4) through the adjusting device (5). The first stand (3) drives the first induction coil (11) into the inner fillet on one side of the crankshaft journal, and the second stand (4) drives the second induction coil (21) into the inner fillet on the other side of the crankshaft journal; S3. The first inductor (1) and the second inductor (2) are connected through a transformer, and the transformer is connected in parallel with the two inductors. During the rotation of the crankshaft, the first induction coil (11) and the second induction coil (21) quench the crankshaft journal and the inner fillet at one time; S4. After quenching is completed, the first upright frame (3) and the second upright frame (4) are synchronously closed towards each other through the adjusting device (5) and lifted upward to disengage from the crankshaft.

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