CN115612823A - Quenching device and quenching method for internal fillet and journal of marine engine crankshaft - Google Patents

Abstract

The invention provides a quenching device and a quenching method for a fillet and a journal of a crankshaft of a marine engine, which comprise a first inductor and a second inductor, wherein the first inductor comprises a first induction coil with a semicircular structure, and the second inductor comprises a second induction coil with a semicircular structure; the induction coil synchronous horizontal movement induction device comprises a first vertical frame used for installing a first inductor, a second vertical frame used for installing a second inductor and an adjusting device used for adjusting the distance between the first vertical frame and the second vertical frame, and under the action of the adjusting device, the first vertical frame and the second vertical frame move relatively to enable the first induction coil and the second induction coil to move horizontally and synchronously. The invention can ensure that the displacement of the first induction coil and the second induction coil entering the crank shaft fillet is consistent, simultaneously can avoid the first induction coil and the second induction coil from generating horizontal displacement during quenching, ensures that the quenching area of the crank shaft journal and the fillet meets the requirements, and further ensures the position precision of one-time quenching of the crank shaft journal and the fillet.

Description

Quenching device and quenching method for internal fillet and journal of marine engine crankshaft

Technical Field

The invention relates to the technical field of crankshaft heat treatment, in particular to a quenching device and a quenching method for internal fillets and journals of crankshafts of marine engines.

Background

Most of the crankshafts used in marine engines are forged steel crankshafts, and a small part of ductile iron crankshafts are also used. In order to improve the fatigue strength of a large crankshaft, a steel crankshaft is usually subjected to quenching and tempering, and a forged steel crankshaft with higher strength requirement is subjected to journal surface and fillet quenching and strengthening treatment. For a high-strength marine engine crankshaft, an unloading groove, also called an inscribed fillet, is machined on a crankshaft journal, the fillet is inwards sunken along the root part of the journal groove, and the inscribed fillet of each journal of the crankshaft needs to be strengthened by medium-frequency quenching to improve the hardness of the inscribed fillet, so that the fatigue strength and the service life of the crankshaft are improved.

The fillet on the journal of the general crankshaft is an external fillet, the external fillet and the journal can be simultaneously heated through medium-frequency induction, and because the internal fillet is in the journal groove, the internal fillet and the journal can not be simultaneously heated and quenched by adopting a common crankshaft induction quenching mode, and the fillets on two sides can be heated twice by adopting an inductor, so that a soft belt can be reserved on the journal, and the wear resistance and the strength of the journal are influenced. Chinese patent CN101899560A discloses a novel process for quenching inner tangent crankshaft fillet, which adopts a scheme that two sets of inductors are adopted, the inductors adopt an eccentric structure, the effective ring of the inductor is in a rectangular half-ring shape, the two sets of inductors move downwards simultaneously and then move back to back from left to right, the effective ring of the inductor enters the inner tangent fillets at two sides to form a complete enveloping surface, thereby completing quenching of the inner tangent fillets and the shaft necks of the crankshaft once. Although the above patent can solve the problem of soft belt on the journal, the applicant finds that the above process method has certain defects, specifically, the upper ends of two sets of inductors in the above patent are respectively connected with a quenching transformer, the two inductors respectively complete up-down and left-right movement by independent driving mechanisms, and because the two inductors are independently controlled by the driving mechanisms when entering the internally tangent fillets at two sides, the displacement of the two inductors entering the internally tangent fillets is inconsistent, so that deviation exists in the internally tangent fillet and journal quenching area, meanwhile, no positioning constraint exists between the two inductors in the horizontal direction, and the two inductors straddle the top of the crankshaft journal, in the rotation process of the crankshaft, the two inductors can swing along with the rotation process of the crankshaft, so that the two inductors generate relative displacement in the horizontal direction, further aggravating the deviation of the internally tangent fillets and the quenching area at the journal, and the position precision of one-time quenching at the crankshaft journal and the internally tangent fillet cannot be ensured

Disclosure of Invention

In view of the above, the invention provides a quenching device and a quenching method for a fillet and a journal of a crankshaft of a marine engine, which are used for solving the problem of poor position precision of one-time quenching of the journal and the fillet of the crankshaft in the conventional quenching device and process.

The technical scheme of the invention is realized as follows:

in one aspect, the invention provides a quenching device for a crank shaft fillet and a shaft neck of a marine engine, which comprises a first inductor and a second inductor, wherein the first inductor comprises a first induction coil with a semicircular structure, and the second inductor comprises a second induction coil with a semicircular structure;

the induction heating device also comprises a first vertical frame for mounting the first inductor and a second vertical frame for mounting the second inductor, wherein the first vertical frame and the second vertical frame are vertically arranged in parallel;

the lower end of the first vertical frame is provided with a first mounting opening with a downward opening, the first mounting opening is in a semicircular arc shape, the first induction coil is fixedly arranged in the first mounting opening, the opening of the first induction coil faces downward, and at least one part of the first induction coil extends out of one side of the first vertical frame away from the second vertical frame;

the lower end of the second vertical frame is provided with a second mounting opening corresponding to the first mounting opening in size and position, the second induction coil is fixedly arranged in the second mounting opening, the opening faces downwards, and at least one part of the second induction coil extends out of one side of the second vertical frame far away from the first vertical frame;

the first vertical frame and the second vertical frame are used for being bridged on the crankshaft journal through the first mounting port and the second mounting port, 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, and under the action of the adjusting device, the first vertical frame and the second vertical frame move relatively to enable the first induction coil and the second induction coil to synchronously and horizontally move.

On the basis of the technical scheme, preferably, the first vertical frame and the second vertical frame are movably connected through a plurality of pin shafts, the adjusting device is provided with a plurality of groups and is respectively located between the outer edges of the first vertical frame and the second vertical frame, the adjusting device comprises a first connecting piece, a second connecting piece and a positive and negative screw rod, the first connecting piece is fixedly connected with the outer edge of the first vertical frame, the second connecting piece is fixedly connected with the outer edge of the second vertical frame, the positive and negative screw rod is horizontally arranged between the first connecting piece and the second connecting piece, and two ends of the positive and negative screw rod are respectively in threaded connection with the first connecting piece and the second connecting piece.

On the basis of the technical scheme, preferably, the first vertical frame comprises two first side plates which are parallel to each other and are fixedly arranged at intervals, three first positioning blocks are fixedly arranged between the two first side plates, one first positioning block is positioned at the top end of the first mounting opening, the other two first positioning blocks are respectively positioned at two ends of the opening of the first mounting opening, and one ends of the three first positioning blocks, which are far away from the first vertical frame, protrude out of the inner wall of the first induction coil; the second grudging post includes that two are parallel to each other and the interval is fixed to be provided with the second curb plate, is fixed between two second curb plates to be provided with three second locating piece, and three second locating piece corresponds with first locating piece level in the intraoral position of second installation, and the one end that the second grudging post was kept away from to three second locating piece bulges second induction coil inner wall.

On the basis of the technical scheme, preferably, the lower end of the first vertical frame is respectively provided with a first water spraying box, the two first water spraying boxes are centrosymmetric relative to the first mounting hole, and a first water spraying opening communicated with the first mounting opening is formed between the two first water spraying boxes; the lower ends of the second vertical frames are respectively provided with a second water spraying box, the second water spraying boxes correspond to the first water spraying boxes in position, and a second water spraying opening communicated with the second mounting opening is formed between the two second water spraying boxes; the first water spraying box is positioned between the two first side plates, and a plurality of first water spraying holes which are cleaned in the direction of the first mounting hole are formed in one surface, facing the first water spraying hole, of the first water spraying box; the second water spraying box is positioned between the two second side plates, and one surface of the second water spraying box facing the second water spraying opening is provided with a plurality of second water spraying holes for cleaning in the direction of the second mounting opening; one side of the first water spraying box far away from the first water spraying opening and one side of the second water spraying box far away from the second water spraying opening are respectively connected with a quenching cooling pipe.

On the basis of the above technical solution, preferably, the first induction coil includes two first effective coils that are symmetrical with respect to the center of the first mounting opening, and the two first effective coils are separated from each other by the first positioning block at the top end of the first mounting opening; the second induction coil comprises two second effective coils which are symmetrical relative to the center of the second mounting opening, and the two second effective coils are separated from each other through a second positioning block at the top end of the second mounting opening;

the first inductor further comprises a first conductive bar assembly connected with the first induction coil, the first conductive bar assembly comprises a first positive conductive bar, a first negative conductive bar and first series conductive bars, one end of each of the two first effective coils is connected with the first positive conductive bar and the first negative conductive bar, and the other two ends of each of the two first effective coils are connected through the first series conductive bar;

the second inductor further comprises a second conductive bar assembly connected with the second induction coil, the second conductive bar assembly comprises a second positive conductive bar, a second negative conductive bar and second series conductive bars, one end of each of the two second effective coils is connected with the second positive conductive bar and the first negative conductive bar, and the other two ends of each of the two second effective coils are connected through the second series conductive bar.

Further, preferably, the sensor further comprises an electrode assembly connected in parallel with the first inductor and the second inductor, the electrode assembly comprises a fixed seat and a conducting device, the fixed seat is movably arranged at the top ends of the first vertical frame and the second vertical frame, the first vertical frame and the second vertical frame can horizontally move relative to the fixed seat, the conducting device is arranged on the fixed seat and connected in parallel with the first conducting bar assembly and the second conducting bar assembly, and the first conducting bar assembly and the second conducting bar assembly can move relative to the conducting device.

Further, preferably, the conductive device includes a first electrode joint, a second electrode joint, a first drainage bar, a second drainage bar, a first conductive plate, a second conductive plate, a first connecting block and a second connecting block, the first electrode joint and the second electrode joint are fixedly disposed on the top surface of the fixing base, the first conductive plate and the second conductive plate are located below the fixing base, the first drainage bar and the second drainage bar are fixedly disposed in the fixing base, the upper end of the first drainage bar is connected with the first electrode joint, the lower end of the first drainage bar is connected with the first conductive plate, the upper end of the second drainage bar is connected with the second electrode joint, the lower end of the second drainage bar is connected with the second conductive plate, the first positive conductive bar and the second positive conductive bar are respectively movably connected with the first conductive plate through the first connecting block, and the first negative conductive bar and the second negative conductive bar are respectively movably connected with the second conductive plate through the second connecting block.

On the basis of the technical scheme, preferably, the first conductive row component, the second conductive row component, the first induction coil and the second induction coil are hollow, the first series conductive row and the second series conductive row are connected with a water return pipe respectively, a cooling water channel communicated with the first conductive row component and the second conductive row component is arranged in the conductive device, water inlet holes are formed in the first electrode connector and the second electrode connector respectively, and sealing pieces used for sealing the cooling water channel are arranged between the first connecting block and the first conductive plate and between the second connecting block and the second conductive plate.

On the basis of the above technical scheme, preferably, the first induction coil and the second induction coil are further provided with a magnetic field shielding plate, and the shape of the magnetic field shielding plate is matched with that of the first induction coil.

On the other hand, the invention discloses a method for quenching the fillet and the journal of the marine engine crankshaft, which comprises the following steps:

s1, folding a first vertical frame and a second vertical frame, bridging on a crankshaft journal through a first mounting port and a second mounting port, and adjusting the positions of the first vertical frame and the second vertical frame on the journal to be centered;

s2, enabling the first vertical frame and the second vertical frame to be synchronously separated in opposite directions through the adjusting device, enabling the first vertical frame to drive the first induction coil to enter an inner fillet on one side of a crankshaft journal, and enabling the second vertical frame to drive the second induction coil to enter an inner fillet on the other side of the crankshaft journal;

s3, connecting the first inductor and the second inductor through a transformer, connecting the transformer and the two inductors in parallel, and quenching the crankshaft journal and the inner round angle by the first induction coil and the second induction coil in one step in the rotation process of the crankshaft;

and S4, after quenching is finished, enabling the first vertical frame and the second vertical frame to be synchronously folded in opposite directions through the adjusting device, and lifting upwards to separate from the crankshaft.

Compared with the prior art, the invention has the following beneficial effects:

(1) The invention discloses a quenching device, which is characterized in that a first vertical frame and a second vertical frame which are vertically parallel are arranged, so that a first induction coil is fixed in a first mounting port at the lower end of the first vertical frame, a second induction coil is fixed in a second mounting port at the lower end of the second vertical frame, at least one part of the first induction coil extends out of one side of the first vertical frame away from the second vertical frame, at least one part of the second induction coil extends out of one side of the second vertical frame away from the first vertical frame, during quenching, the first vertical frame and the second vertical frame are folded through an adjusting device, then the first induction coil and the second induction coil are bridged on a crankshaft journal through the first mounting port and the second mounting port, the first vertical frame and the second vertical frame are synchronously separated through the adjusting device, the first induction coil is driven by the first vertical frame to enter an inner fillet at one side of the crankshaft journal, the second vertical frame is driven by the second induction coil to enter an inner fillet at the other side of the crankshaft journal, the process can ensure that the first induction coil and the second induction coil enter the same fillet, and simultaneously, in the process, the relative position between the first vertical frame and the second vertical frame can be adjusted to ensure that the horizontal displacement of the first induction coil and the second induction coil and the crankshaft journal, thereby ensure that the crankshaft journal displacement and the crankshaft is matched with the quenching area and the quenching area, and the crankshaft journal displacement of the crankshaft, and further ensure the crankshaft displacement of the crankshaft;

(2) The spacing between the first vertical frame and the second vertical frame is adjusted through the positive and negative screws, so that the structure is simple, and the operation is convenient;

(3) The three first positioning blocks are arranged on the first mounting port, the three second positioning blocks are arranged on the second mounting port, so that the whole quenching device can be positioned on the crankshaft journal after spanning the crankshaft journal, and meanwhile, the first inductor and the second inductor can be prevented from being in contact with the crankshaft journal;

(4) The consistency of the fillet quench hardening layers on the two sides of the crankshaft journal can be ensured by connecting the first inductor and the second inductor in parallel by using a transformer;

(5) Through the first electrically conductive row of subassembly, the electrically conductive row of subassembly of second, the inside cavity that sets up of first induction coil and second induction coil, be connected with the wet return on the electrically conductive row of first series connection and the electrically conductive row of second series connection respectively, be provided with in the electrically conductive device with the first electrically conductive row of subassembly, the cooling water course that the electrically conductive row of subassembly is linked together of second, the inlet opening has been seted up on first electrode joint and the second electrode joint respectively, when can realizing that first induction coil and second induction coil are parallelly connected electrically conductive, can also realize effectively cooling first induction coil and second induction coil, the electrically conductive and cooling structure of induction coil are integrated as an organic whole, make whole guenching unit compact structure, and small in size is light and handy, and the reduction space occupies.

(6) The magnetic field shielding plate is arranged on the first induction coil and the second induction coil, so that magnetic field eddy current between the first induction coil and the second induction coil can be blocked through the magnetic field shielding plate, and unevenness of a surface quenching hardened layer of a crankshaft journal between the first induction coil and the second induction coil is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of a quenching apparatus for the internal fillet and journal of a marine engine crankshaft according to the present invention;

FIG. 2 is a schematic view of an assembly structure of a quenching device for a fillet and a journal of a crankshaft of a marine engine and a journal of the crankshaft, which is disclosed by the invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

FIG. 5 is a schematic view of an assembly structure of a first stand and a second stand according to the present disclosure;

FIG. 6 is a schematic view of an assembly structure of a first stand and a second stand according to the present disclosure;

FIG. 7 is a schematic structural diagram of a first inductor according to the present disclosure;

FIG. 8 is a schematic diagram of a second sensor according to the present disclosure;

FIG. 9 is a schematic view of an assembly structure of the first inductor, the second inductor and the electrode assembly according to the present disclosure;

FIG. 10 is a schematic view of a conductive device according to the present disclosure;

FIG. 11 is a plan view of the quenching apparatus and crankshaft journal assembling structure disclosed in the present invention;

FIG. 12 is a schematic diagram of a first inductor, a second inductor, a crankshaft journal and a quenching state at an inner round corner according to the present disclosure;

description of the drawings:

1. a first inductor; 2. a second inductor; 11. a first induction coil; 21. a second induction coil; 3. a first stand; 4. a second stand; 30. a first mounting port; 40. a second mounting opening; 5. an adjustment device; 51. A first connecting member; 52. a second connecting member; 53. a positive and negative screw; 31. a first side plate; 32. a first positioning block; 41. a second side plate; 42. a second positioning block; 33. a first water spray box; 43. a second water spray box; 331. A first water spray hole; 431. a second water jet hole; 6. quenching the cooling pipe; 111. a first effective circle; 12. a first conductive bar assembly; 121. a first positive electrode conductive bar; 122. a first negative electrode conductive bar; 123. a first series conductive bar; 211. a second active loop; 22. a second conductive bar assembly; 221. a second positive electrode conductive bar; 222. A second negative electrode conductive bar; 223. a second series conductor bar; 7. an electrode assembly; 71. a fixed seat; 72. a conductive device; 721. a first electrode tab; 722. a second electrode tab; 723. a first drainage row; 724. a second drainage row; 725. a first conductive plate; 726. a second conductive plate; 727. a first connection block; 728. a second connecting block; 8. a water return pipe; 720. a water inlet hole; 9. a magnetic field shielding plate; s, a crankshaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.

Referring to fig. 1 and fig. 2-5, the embodiment of the invention discloses a quenching device for a crankshaft fillet and a journal of a marine engine, which is used for quenching the surface of the crankshaft journal and fillets on two sides of the journal.

Specifically, the quenching apparatus disclosed in the embodiment of the present invention includes a first inductor 1 and a second inductor 2. Because the crankshaft of the marine engine is large in size, the inductor cannot be sleeved on the crankshaft, and therefore, the scheme adopted in the implementation is that the first inductor 1 and the second inductor 2 are structurally arranged, wherein the first inductor 1 comprises a first induction coil 11 with a semicircular structure, and the second inductor 2 comprises a second induction coil 21 with a semicircular structure; therefore, the first induction coil 11 and the second induction coil 21 which are of the semicircular structures are bridged on the surface of the journal of the crankshaft, and the crankshaft is driven to rotate through the rotating mechanism, so that the first induction coil 11 and the second induction coil 21 are used for quenching the surface of the crankshaft.

The two inductors are respectively driven to move leftwards and rightwards by the driving mechanism, so that the inductors enter inner fillets at two sides of the crankshaft journal, and due to the fact that the two inductors respectively move horizontally, the displacement of the two inductors entering the inner fillets is inconsistent, and deviation exists between the inner fillets and a journal quenching area. Meanwhile, the two sets of inductors are not positioned and restrained in the horizontal direction, and span the top of the crankshaft journal, so that the two sets of inductors swing along with the crankshaft in the rotating process of the crankshaft, the two sets of inductors are further relatively displaced in the horizontal direction, the deviation of quenching areas at the internally tangent fillets and the journal is further aggravated, and the position precision of one-time quenching at the crankshaft journal and the internally tangent fillets cannot be ensured.

Therefore, the present invention adopts the following technical means to solve the above problems.

The invention discloses a first vertical frame 3 and a second vertical frame 4, wherein the first vertical frame 3 and the second vertical frame 4 are vertically arranged in parallel and are respectively used for installing a first inductor 1 and a second inductor 2.

First installing port 30 that the opening faced down is seted up to first grudging post 3 lower extreme, and first installing port 30 is the semicircle arcuation, and first induction coil 11 is fixed to be set up in first installing port 30, and the opening faces down, and in this embodiment, the radius of first installing port 30 is greater than the radius of first induction coil 11, and the internal diameter of first induction coil 11 and the diameter phase-match of crankshaft journal simultaneously.

The lower end of the second vertical frame 4 is provided with a second mounting opening 40 corresponding to the first mounting opening 30 in size and position, and the second induction coil 21 is fixedly arranged in the second mounting opening 40 with a downward opening. In this embodiment, the radius of the second mounting opening 40 is larger than the radius of the second inductor 21, while the inner diameter of the second inductor 21 matches the diameter of the crankshaft journal.

Through above-mentioned structure setting, can fix first induction coil 11 at 3 lower extreme arc openings of first grudging post, the arc opening part at 4 lower extremes of second grudging post is fixed to second induction coil 21, and first induction coil 11 and 21 levels of second induction coil align, and the opening of two induction coils is all vertical down.

In order to realize that the first induction coil 11 and the second induction coil 21 can horizontally move to enter the fillets on two sides of the crankshaft journal, in the embodiment, the 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, and under the action of the adjusting device 5, the first vertical frame 3 and the second vertical frame 4 relatively move so as to enable the first induction coil 11 and the second induction coil 21 to synchronously and horizontally move.

In this embodiment, at least a portion of the first induction coil 11 extends out of a side of the first stand 3 away from the second stand 4; at least a part of the second induction coil 21 extends out of one side of the second vertical frame 4 far away from the first vertical frame 3. Therefore, in the specific implementation process, the first vertical frame 3 and the second vertical frame 4 are folded through the adjusting device 5, then the first installation port 30 and the second installation port 40 are bridged on the crankshaft journal, the first vertical frame 3 and the second vertical frame 4 are synchronously separated through the adjusting device 5, the first vertical frame 3 drives the first induction coil 11 to move towards one side of the crankshaft journal, the second vertical frame 4 drives the second induction coil 21 to move towards the other side of the crankshaft journal, the first induction coil 11 protrudes out of the outer wall of the first vertical frame 3, and the second induction coil 21 protrudes out of the outer wall of the second vertical frame 4, so that when the first vertical frame 3 and the second vertical frame 4 are separated to a proper position relatively, the first induction coil 11 can enter the inner fillet on one side of the crankshaft journal, the second induction coil can enter the inner fillet on the other side of the crankshaft journal, the process can ensure that the first induction coil 11 and the second induction coil 21 enter the inner fillets to be consistent, and simultaneously, in the process, the first vertical frame 3 and the second vertical frame 4 can keep the relative positions of the first induction coil 11 and the second vertical frame 4 to be consistent with the inner fillet, and further ensure that the horizontal quenching displacement of the second induction coil 11 and the crankshaft journal can be consistent with each other quenching area, and the quenching area, thereby ensuring that the quenching displacement of the quenching area of the crankshaft journal can be consistent with each other quenching area.

In order to realize that the interval between the first vertical frame 3 and the second vertical frame 4 is adjustable and the first vertical frame 3 and the second vertical frame 4 are movably connected with each other, the first vertical frame 3 and the second vertical frame 4 are movably connected with each other through a plurality of pin shafts in the embodiment, so that the first vertical frame 3 and the second vertical frame 4 can be horizontally adjusted, and in order to enable the first vertical frame 3 and the second vertical frame 4 to be synchronously closed or separated, the embodiment adopts the scheme that a plurality of groups of adjusting devices 5 are arranged between the outer edges of the first vertical frame 3 and the second vertical frame 4, and preferably, the two sides and the top in the width direction of the first vertical frame 3 and the second vertical frame 4 are respectively provided with the adjusting devices 5. Specifically, the adjusting device 5 in this embodiment includes a first connecting member 51, a second connecting member 52, and a positive and negative screw 53, the first connecting member 51 is fixedly connected to the outer edge of the first vertical frame 3, the second connecting member 52 is fixedly connected to the outer edge of the second vertical frame 4, the positive and negative screw 53 is horizontally disposed between the first connecting member 51 and the second connecting member 52, and two ends of the positive and negative screw are respectively in threaded connection with the first connecting member 51 and the second connecting member 52. In this arrangement, the forward and reverse screw 53 is rotated to cause forward and reverse screw rotation with the first link 51 and the second link 52, thereby synchronously moving the first vertical frame 3 and the second vertical frame 4 together or apart. The adjusting device 5 has simple structure and convenient operation. In order to avoid that the forward and backward screw rods 53 are automatically rotated by vibration in the quenching process, after the distance between the first vertical frame 3 and the second vertical frame 4 is adjusted, the stop blocks can be inserted between the first vertical frame 3 and the second vertical frame 4 to prevent the first induction coil 11 and the second induction coil 21 from relatively moving, so that the position accuracy of the first induction coil 11 and the second induction coil 21 in the quenching process is ensured.

Because the crankshaft journal is of a groove-shaped structure and has a certain groove width, the width of the first vertical frame 3 and the width of the second vertical frame 4 cannot be too wide, otherwise the first vertical frame 3 and the second vertical frame 4 cannot be inserted into the groove of the crankshaft journal, for this reason, some structural arrangements are made for the first vertical frame 3 and the second vertical frame 4, specifically, the first vertical frame 3 comprises two first side plates 31 which are parallel to each other and fixedly arranged at intervals, the second vertical frame 4 comprises two second side plates 41 which 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. From this the setting can be fixed first induction coil 11 in two first curb plate 31 below first installing port 30, second induction coil 21 is fixed in two second installing port 40 of second curb plate 41 below, other electrically conductive and the waterway pipe fitting on the inductor also can set up between two first curb plate 31 and two second curb plates 41 simultaneously for inductor structure in the whole guenching unit is integrated on first grudging post 3 and second grudging post 4, avoids exposing the outside of first grudging post 3 and second grudging post 4, causes interference influence to bent axle or other mechanisms in the quenching process.

Since the first coil 11 is installed in the first installation opening 30 and the second coil 21 is installed in the second installation opening 40, the first coil 11 and the second coil 21 need to be bridged over the crankshaft journal during the quenching process, but the first coil 11 and the second coil 21 need to be prevented from contacting the surface of the crankshaft journal.

Therefore, in this embodiment, three first positioning blocks 32 are fixedly disposed 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, the other two first positioning blocks 32 are respectively located at two ends of the opening of the first mounting opening 30, and one end of each of the three first positioning blocks 32, which is far away from the first vertical frame 3, protrudes out of 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 mounting opening 40 horizontally correspond to the first positioning blocks 32, and one ends of the three second positioning blocks 42, which are far away from the second vertical frame 4, protrude out of the inner wall of the second induction coil 21.

With the arrangement, after the quenching device is inserted into the crankshaft journal, the three first positioning blocks 32 and the three second positioning blocks 42 can be directly contacted and positioned with the crankshaft journal, so that the ignition caused by the direct contact of the first inductor 1 and the second inductor 2 with the crankshaft journal is avoided.

The arrangement of three first positioning blocks 32 and three second positioning blocks 42 also has the following purpose. Referring to fig. 11 and 12, specifically, when the quenching device of the present invention is used to quench a crankshaft journal, the first vertical frame 3 and the second vertical frame 4 are folded and bridged over the crankshaft journal through the first mounting port 30 and the second mounting port 40, the positions of the first vertical frame 3 and the second vertical frame 4 on the journal are adjusted and centered, the first vertical frame 3 and the second vertical frame 4 can be separated from each other by the adjusting device 5 after the first vertical frame 3 and the second vertical frame 4 are integrally positioned at the central position of the crankshaft journal through visual inspection, and after the side walls of the three first positioning blocks 32 on the first vertical frame 3 contact the wall of the crankshaft side groove, at least a part of the first induction coil 11 extends out of the outer wall of the first vertical frame 3, so that the part of the first induction coil 11 extending out is inserted into the inner corner of the crankshaft side, and in this embodiment, the first induction coil 11 is delayed out of the outer wall of the first vertical frame 3 and is matched with the width of the inner corner of the crankshaft that is needed for quenching. Therefore, after the first positioning block 32 contacts the wall of the crankshaft journal groove, the first induction coil 11 enters the fillet on one side of the crankshaft, so that the displacement of the first induction coil 11 can be accurately controlled, the quenching area of the first induction coil 11 in the fillet meets the process requirement, and meanwhile, the precision can be ensured. Similarly, the second inductor 2 and the first inductor 1 are identical in principle.

In order to cool the surface of the crankshaft during the quenching process, the crankshaft journal is located in the first mounting port 30 and the second mounting port 40, and referring to fig. 6, in this embodiment, first water spraying boxes 33 are respectively arranged at the lower end of the first vertical frame 3, two first water spraying boxes 33 are centrosymmetric with respect to the first mounting hole, and a first water spraying port communicated with the first mounting port 30 is formed between the two first water spraying boxes 33; the lower ends of the second vertical frames 4 are respectively provided with a second water spraying box 43, the second water spraying boxes 43 correspond to the first water spraying boxes 33 in position, and a second water spraying opening communicated with the second mounting opening 40 is formed between the two second water spraying boxes 43; the first water spraying box 33 is positioned between the two first side plates 31, and one surface of the first water spraying box 33 facing the first water spraying opening is provided with a plurality of first water spraying holes 331 which are cleaned towards the direction of the first mounting opening 30; the second water spraying box 43 is positioned between the two second side plates 41, and one surface of the second water spraying box 43 facing the second water spraying opening is provided with a plurality of second water spraying holes 431 which are cleaned in the direction facing the second mounting opening 40; the side of the first water spray box 33 far away from the first water spray opening and the side of the second water spray box 43 far away from the second water spray opening are respectively connected with a quenching cooling pipe 6.

In this arrangement, the quenching cooling pipe 6 feeds cooling water to the two first water jet boxes 33 and the two second water jet boxes 43, respectively, and the cooling water is obliquely and upwardly jetted from the first water jet hole 331 and the second water jet hole 431 to the first water jet hole and the second water jet hole, thereby quenching and cooling the surface of the journal of the crankshaft.

Because a first positioning block 32 is fixedly arranged above the first mounting opening 30, a second positioning block 42 is fixedly arranged above the second mounting opening 40, and meanwhile, 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, the embodiment of the invention adopts the following method to solve the problem, specifically, the first induction coil 11 comprises two first effective rings 111 which are symmetrical relative to the center of the first mounting opening 30, and the two first effective rings 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 which are symmetrical with respect to the center of the second mounting hole 40, and the two second effective coils 211 are spaced apart from each other by a second positioning block 42 at the top end of the second mounting hole 40.

In order to realize that the two first effective circles 111 are connected in series to form a conductive loop, the scheme adopted by the embodiment is as follows: referring to fig. 7 and 8, the first inductor 1 further includes a first conducting bar assembly 12 connected to the first induction coil 11, the first conducting bar assembly 12 includes a first positive conducting bar 121, a first negative conducting bar 122 and a first serial conducting bar 123, one end of each of the two first effective rings 111 is connected to the first positive conducting bar 121 and the first negative conducting bar 122, and the other two ends of each of the two first effective rings 111 are connected to the first serial conducting bar 123; therefore, the two first effective rings 111 are connected in series through the first series-connection conducting bar 123, and the other two ends of the two first effective rings 111 are respectively connected with the high-frequency current through the first positive-electrode conducting bar 121 and the first negative-electrode conducting bar 122.

In order to realize that the two second effective rings 211 are connected in series to form a conductive loop, the scheme adopted by the embodiment is as follows: the second inductor 2 further comprises a second conductive bar assembly 22 connected with the second induction coil 21, the second conductive bar assembly 22 comprises a second positive conductive bar 221, a second negative conductive bar 222 and a second serial conductive bar 223, one end of each of the two second effective coils 211 is connected with the second positive conductive bar 221 and the second negative conductive bar 222, and the other two ends of each of the two second effective coils 211 are connected with the second serial conductive bar 223; therefore, the two second effective coils 211 are connected in series through the second series-connection conductive bar 223, and the other two ends of the two second effective coils 211 are respectively connected with the high-frequency current through the second positive electrode conductive bar 221 and the second negative electrode conductive bar 222.

In the above embodiment, the first conductive bar assembly 12, the second conductive bar assembly 22, the first effective ring 111 and the second effective ring 211 are made of copper, and have high electrical conductivity and high heat dissipation.

Because the first induction coil 11 and the second induction coil 21 need to respectively quench the fillets at the two sides of the crankshaft, if the first induction coil 11 and the second induction coil 21 are connected in series, the hardness layers at the two fillets after quenching are not uniform. To this end, in the present embodiment, the first induction coil 11 and the second induction coil 21 are connected in parallel to the quenching transformer, specifically, as shown in fig. 9 and 10, the electrode assembly 7 is disposed to be connected in parallel to the first induction and the second induction device 2, the electrode assembly 7 includes a fixing seat 71 and a conducting device 72, the fixing seat 71 is movably disposed at the top end of the first vertical frame 3 and the second vertical frame 4, the first vertical frame 3 and the second vertical frame 4 can move horizontally relative to the fixing seat 71, the conducting device 72 is disposed on the fixing seat 71 and is connected in parallel to the first conducting bar assembly 12 and the second conducting bar assembly 22, and the first conducting bar assembly 12 and the second conducting bar assembly 22 can move relative to the conducting device 72. From this setting, because first induction coil 11 and second induction coil 21 are fixed respectively on first grudging post 3 and second grudging post 4, and first leading electrical bar subassembly 12 of first induction coil 11 upper end connection, the leading electrical bar subassembly 22 of second is connected to second induction coil 21 upper end, consequently, first leading electrical bar subassembly 12 and the leading electrical bar subassembly 22 of second all need with conductive means 72 swing joint, when first grudging post 3 and second grudging post 4 spacing, also need first leading electrical bar subassembly 12 and the leading electrical bar subassembly 22 of second and conductive means 72 to adjust the relation of connection.

Specifically, the conductive device 72 in this embodiment includes a first electrode connector 721, a second electrode connector 722, a first drainage bar 723, a second drainage bar 724, a first conductive plate 725, a second conductive plate 726, a first connecting block 727, and a second connecting block 728, where the first electrode connector 721 and the second electrode connector 722 are fixedly disposed on the top surface of the fixing base 71, the first conductive plate 725 and the second conductive plate 726 are located below the fixing base 71, the first drainage bar 723 and the second drainage bar 724 are fixedly disposed in the fixing base 71, the upper end of the first drainage bar 723 is connected to the first electrode connector 721, the lower end of the first drainage bar 723 is connected to the first conductive plate 725, the upper end of the second drainage bar 724 is connected to the second electrode connector 722, the lower end of the second drainage bar 724 is connected to the second connecting block 726, the first positive conductive bar 121 and the second positive conductive bar 221 are respectively movably connected to the first conductive plate 725 through the first connecting block 727, and the first negative conductive bar 122 and the second negative conductive bar 222 are respectively movably connected to the second connecting block 728. Therefore, the first electrode joint 721 and the second electrode joint 722 are respectively connected to the quenching transformer, the first electrode joint 721 respectively passes the positive current through the first current guiding bar 723 and the first current conducting plate 725 to the first induction coil 11 through the first positive current conducting bar 121 and the second positive current conducting bar 221, the second electrode joint 722 respectively passes the negative current through the second current guiding bar 724 and the second current conducting plate 726 to the first induction coil 11 through the first negative current conducting bar 122 and the second negative current conducting bar 222, so that the first induction coil 11 and the second induction coil 21 are connected in parallel, and a quenching transformer is shared, so that the whole quenching device is simple in structure and convenient to operate.

In this embodiment, the first connecting block 727 and the first conductive plate 725 are connected by a bar-shaped hole and a bolt, so that the horizontal adjustability is realized.

In order to realize the cooling of the first induction coil 11 and the second induction coil 21 in the quenching process, the embodiment adopts a scheme that the first conductive bar component 12, the second conductive bar component 22, the first induction coil 11 and the second induction coil 21 are hollow inside, the first serial conductive bar 123 and the second serial conductive bar 223 are respectively connected with the water return pipe 8, a cooling water channel communicated with the first conductive bar component 12 and the second conductive bar component 22 is arranged in the conductive device 72, and the first electrode connector 721 and the second electrode connector 722 are respectively provided with a water inlet hole 720, so that the effective cooling of the first induction coil 11 and the second induction coil 21 can be realized when the first induction coil 11 and the second induction coil 21 are connected in parallel, and the conductive and cooling structures of the induction coils are integrated into a whole, so that the whole quenching device has a compact structure, a light volume and reduced space occupation.

Seals for sealing the cooling channels are provided 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. The cooling water channel can be sealed by the sealing member when the first connection block 727 is adjusted to be in a relative position with the first conductive plate 725 and when the second connection block 728 is adjusted to be in a relative position with the second conductive plate 726, so that the cooling water leakage can be avoided.

Because there is stronger magnetic field eddy current between first induction coil 11 and the second induction coil 21, to the narrower condition of crankshaft journal groove, the magnetic field eddy current on first induction coil 11 and the second induction coil 21 overlaps each other, can have the hardness layer too thick after quenching in crankshaft journal middle part, lead to with other regional quenching hardness layer inhomogeneous, for this reason, this embodiment still is provided with magnetic field shield plate 9 at first induction coil 11 and second induction coil 21, can block the magnetic field eddy current between first induction coil 11 and the second induction coil 21 through magnetic field shield plate 9, avoid the crankshaft journal surface quenching hardening inhomogeneous between first induction coil 11 and the second induction coil 21.

The invention also discloses a quenching method for the fillet and the journal of the crankshaft of the marine engine, which comprises the following steps:

s1, folding a first vertical frame 3 and a second vertical frame 4, bridging on a crankshaft journal through a first mounting port 30 and a second mounting port 40, and adjusting the positions of the first vertical frame 3 and the second vertical frame 4 on the journal to be centered;

s2, synchronously separating the first vertical frame 3 and the second vertical frame 4 in opposite directions through the adjusting device 5, driving the first induction coil 11 into an inner fillet on one side of the crankshaft journal by the first vertical frame 3, and driving the second induction coil 21 into an inner fillet on the other side of the crankshaft journal by the second vertical frame 4;

s3, the first inductor 1 and the second inductor 2 are connected through a transformer, the transformer is connected with the two inductors in parallel, and the first induction coil 11 and the second induction coil 21 quench the crankshaft journal and the inner round corner at one time in the rotation process of the crankshaft;

and S4, after quenching is finished, enabling the first vertical frame 3 and the second vertical frame 4 to be synchronously folded in opposite directions through the adjusting device 5, and lifting upwards to separate from the crankshaft.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A quenching device for a crank shaft fillet and a journal of a marine engine comprises a first inductor (1) and a second inductor (2), wherein the first inductor (1) comprises a first induction coil (11) with a semicircular structure, and the second inductor (2) comprises a second induction coil (21) with a semicircular structure;

the method is characterized in that: the device is characterized by further comprising a first vertical frame (3) used for installing the first inductor (1) and a second vertical frame (4) used for installing the second inductor (2), wherein the first vertical frame (3) and the second vertical frame (4) are vertically arranged in parallel;

a first mounting opening (30) with a downward opening is formed in the lower end of the first vertical frame (3), the first mounting opening (30) is in a semicircular arc shape, the first induction coil (11) is fixedly arranged in the first mounting opening (30) with the downward opening, and at least one part of the first induction coil (11) extends out of one side, away from the second vertical frame (4), of the first vertical frame (3);

a second mounting opening (40) corresponding to the first mounting opening (30) in size and position is formed in the lower end of the second vertical frame (4), the second induction coil (21) is fixedly arranged in the second mounting opening (40), the opening faces downwards, and at least one part of the second induction coil (21) extends out of one side, away from the first vertical frame (3), of the second vertical frame (4);

the first vertical frame (3) and the second vertical frame (4) are used for being bridged on a crankshaft journal through a first mounting port (30) and a second mounting port (40), an adjusting device (5) used 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), and under the action of the adjusting device (5), the first vertical frame (3) and the second vertical frame (4) move relatively to enable the first induction coil (11) and the second induction coil (21) to synchronously and horizontally move.

2. The marine engine crankshaft fillet and journal quenching apparatus according to claim 1, wherein: the adjustable screw type vertical frame is characterized in that the first vertical frame (3) is movably connected with the second vertical frame (4) through a plurality of pin shafts, the adjusting device (5) is provided with a plurality of groups and is respectively located between the outer edges of the first vertical frame (3) and the second vertical frame (4), the adjusting device (5) comprises a first connecting piece (51), a second connecting piece (52) and a forward-reverse screw (53), the first connecting piece (51) is fixedly connected with the outer edge of the first vertical frame (3), the second connecting piece (52) is fixedly connected with the outer edge of the second vertical frame (4), the forward-reverse screw (53) is horizontally arranged between the first connecting piece (51) and the second connecting piece (52), and two ends of the forward-reverse screw are respectively in threaded connection with the first connecting piece (51) and the second connecting piece (52).

3. The marine engine crankshaft fillet and journal quench device of claim 1, wherein: the first vertical frame (3) comprises 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 first positioning block (32) is positioned at the top end of the first mounting opening (30), the other two first positioning blocks (32) are respectively positioned at two ends of the opening of the first mounting opening (30), and one ends, far away from the first vertical frame (3), of the three first positioning blocks (32) protrude out of the inner wall of the first induction coil (11); the second vertical frame (4) comprises two second side plates (41) which are parallel to each other and are 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) horizontally correspond to the first positioning blocks (32), and one ends, far away from the second vertical frame (4), of the three second positioning blocks (42) protrude out of the inner wall of the second induction coil (21).

4. The marine engine crankshaft fillet and journal quench device of claim 3, wherein: the lower end of the first vertical frame (3) is respectively provided with a first water spraying box (33), the two first water spraying boxes (33) are centrosymmetric relative to the first mounting hole, and a first water spraying opening communicated with the first mounting opening (30) is formed between the two first water spraying boxes (33); the lower end of the second vertical frame (4) is respectively provided with a second water spraying box (43), the second water spraying boxes (43) correspond to the first water spraying boxes (33), and a second water spraying opening communicated with the second mounting opening (40) is formed between the two second water spraying boxes (43); the first water spraying box (33) is positioned between the two first side plates (31), and one surface of the first water spraying box (33) facing the first water spraying opening is provided with a plurality of first water spraying holes (331) which are cleaned towards the direction of the first mounting opening (30); the second water spraying box (43) is positioned between the two second side plates (41), and one surface of the second water spraying box (43) facing the second water spraying opening is provided with a plurality of second water spraying holes (431) which are cleaned in the direction of the second mounting opening (40); one side of the first water spraying box (33) far away from the first water spraying opening and one side of the second water spraying box (43) far away from the second water spraying opening are respectively connected with a quenching cooling pipe (6).

5. The quenching apparatus for a crank fillet and a journal of a marine engine as set forth in claim 3, wherein: the first induction coil (11) comprises two first effective coils (111) which are centrosymmetric relative to the first mounting opening (30), and the two first effective coils (111) are separated from each other through a first positioning block (32) at the top end of the first mounting opening (30); the second induction coil (21) comprises two second effective rings (211) which are centrosymmetric relative to the second mounting opening (40), and the two second effective rings (211) are separated from each other through a second positioning block (42) at the top end of the second mounting opening (40);

the first inductor (1) further comprises a first conductive bar component (12) connected with the first induction coil (11), the first conductive bar component (12) comprises 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 rings (111) is connected with the first positive conductive bar (121) and the first negative conductive bar (122), and the other two ends of each of the two first effective rings (111) are connected through the first series conductive bar (123);

the second inductor (2) further comprises a second conductive bar component (22) connected with the second induction coil (21), the second conductive bar component (22) comprises 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 connected with the second positive conductive bar (221) and the first negative conductive bar (122) respectively, and the other two ends of each of the two second effective coils (211) are connected with the second series conductive bar (223).

6. The marine engine crankshaft fillet and journal quench device of claim 5, wherein: the sensor comprises a first inductor and a second inductor, and is characterized by further comprising an electrode assembly (7) connected with the first inductor and the second inductor in parallel, wherein the electrode assembly (7) comprises a fixed seat (71) and a conducting device (72), the fixed seat (71) is movably arranged at the top ends of the first vertical frame (3) and the second vertical frame (4), the first vertical frame (3) and the second vertical frame (4) can horizontally move relative to the fixed seat (71), the conducting device (72) is arranged on the fixed seat (71) and connected with a first conducting bar assembly (12) and a second conducting bar assembly (22) in parallel, and the first conducting bar assembly (12) and the second conducting bar assembly (22) can move relative to the conducting device (72).

7. The marine engine crankshaft fillet and journal quench device of claim 6, wherein: the conductive device (72) comprises a first electrode joint (721), a second electrode joint (722), a first drainage bar (723), a second drainage bar (724), a first conductive plate (725), a second conductive plate (726), a first connecting block (727) and a second connecting block (728), the first electrode joint (721) and the second electrode joint (722) are fixedly arranged on the top surface of the fixing base (71), the first conductive plate (725) and the second conductive plate (726) are located below the fixing base (71), the first drainage bar (723) and the second drainage bar (724) are fixedly arranged in the fixing base (71), the upper end of the first drainage bar (723) is connected with the first electrode joint (721), the lower end of the first drainage bar (723) is connected with the first conductive plate (725), the upper end of the second drainage bar (724) is connected with the second electrode joint (722), the lower end of the second drainage bar (724) is connected with the second conductive plate (721), the first positive electrode bar (221) and the second conductive plate (726) are movably connected with the second negative electrode joint (121) through the first conductive plate (728) and the second connecting block (728) and the second conductive plate (726) are movably connected with the first conductive plate (121).

8. The marine engine crankshaft fillet and journal quenching apparatus as claimed in claim 7, wherein: the utility model provides a cooling water pipe, including electrically conductive row of first subassembly (12), the electrically conductive row of second subassembly (22), first induction coil (11) and second induction coil (21) inside cavity, be connected with wet return (8) on electrically conductive row (223) of first series connection (123) and the electrically conductive row of second series connection (223) respectively, be provided with the cooling water course that is linked together with first electrically conductive row of subassembly (12), the electrically conductive row of second subassembly (22) in electrically conductive device (72), seted up inlet opening (720) on first electrode joint (721) and the second electrode joint (722) respectively, all be provided with between first connecting block (727) and first conductive plate (725), between second connecting block (728) and the second conductive plate (726) and be used for carrying out the sealed sealing member to the cooling water course.

9. The marine engine crankshaft fillet and journal quench device of claim 3, wherein: 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 matched with that of the first induction coil (11).

10. A method for quenching a fillet and a journal of a crankshaft of a marine engine, which uses the quenching apparatus for a fillet and a journal of a crankshaft of a marine engine according to claim 5, comprising the steps of:

s1, folding a first vertical frame (3) and a second vertical frame (4), bridging on a crankshaft journal through a first mounting port (30) and a second mounting port (40), and adjusting the positions of the first vertical frame (3) and the second vertical frame (4) on the journal to be centered;

s2, synchronously separating the first vertical frame (3) and the second vertical frame (4) in opposite directions through the adjusting device (5), driving the first induction coil (11) to enter an inner fillet on one side of a crankshaft journal by the first vertical frame (3), and driving the second induction coil (21) to enter an inner fillet on the other side of the crankshaft journal by the second vertical frame (4);

s3, the first inductor (1) and the second inductor (2) are connected through a transformer, the transformer is connected with the two inductors in parallel, and the first induction coil (11) and the second induction coil (21) quench the journal and the inner round corner of the crankshaft at one time in the rotation process of the crankshaft;

and S4, after quenching is finished, the first vertical frame (3) and the second vertical frame (4) are synchronously folded in opposite directions through the adjusting device (5), and are lifted upwards to be separated from the crankshaft.

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