Induction hardening device for camshaft of marine diesel engine

Abstract

According to the induction quenching device for the camshaft of the marine diesel engine, a cooling device used for rapidly cooling a heated camshaft bearing neck is arranged below an induction body, and the cooling device is fixedly connected with a conductive connecting device in an insulated mode through a plurality of sets of connecting assemblies in a vertical position adjustable mode; the cooling device comprises a water spraying ring, the water spraying ring is of an annular structure made of a hollow pipe, a plurality of water spraying holes facing a bearing neck of the cam shaft are evenly distributed in the inner side ring wall of the water spraying ring, and a plurality of water inlet pipes which are communicated with a water supply pipe and supply water to the interior of the water spraying ring are evenly distributed on the outer ring wall of the water spraying ring in the circumferential direction. According to the utility model, the vertical distance between the water spraying ring and the sensing body is adjusted, the quenching cooling time is prolonged, the quenching effect is ensured, the defect that a soft point and a soft belt are generated as the camshaft bearing neck does not reach the required temperature during the induction quenching of the camshaft is overcome, the heating temperature of the camshaft bearing neck is improved, and the hardness of a base circle after quenching is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment, and in particular relates to an induction quenching device for a camshaft of a marine diesel engine. Background Art

[0002] The camshaft is one of the key moving parts of a marine diesel engine and is the main driving part of the valve mechanism. As a moving part, the camshaft is subjected to periodic impact loads, the contact stress on the camshaft bearing neck is very large, and the relative sliding speed is also very high. Therefore, the working surface is required to have high hardness and wear resistance, the core has strong and tough properties, and has a good transition layer structure.

[0003] Since the diameter of the diesel engine camshaft bearing journal is 185mm, the length of the quenching area is 132mm, and the depth of the hardened layer is ≥2.3mm, when using traditional continuous heating quenching, the heating area is too large, the heating and cooling time is short, and the surface of the part cannot reach the quenching temperature required, resulting in soft spots and soft bands, and the depth and hardness of the hardened layer do not meet the requirements. Traditional equipment cannot meet the induction quenching of the cam. Therefore, it is necessary to make improvements to the above problems. Utility Model Content

[0004] The technical problem solved by the utility model is to provide an induction quenching device for a camshaft of a marine diesel engine. Under the premise of not increasing the equipment cost and ensuring the production efficiency and processing quality, the structure of the cooling device is optimized, and the device is insulated and fixedly connected to the conductive connecting device in an adjustable vertical position through multiple groups of connecting components, so as to achieve the adjustment of the vertical distance between the water spray ring and the inductor, increase the quenching cooling time, improve the cooling effect, ensure the quenching effect, and combine with the induction heating zone of the annular structure to solve the problem of soft spots and soft bands generated when the camshaft bearing neck does not reach the required temperature during the camshaft induction quenching, increase the heating temperature of the camshaft bearing neck, and improve the hardness of the base circle after quenching, so that the cam can meet the design requirements after induction quenching.

[0005] The technical solution adopted by the utility model is as follows: an induction quenching device for a camshaft of a marine diesel engine, comprising a conductive connecting device electrically connected to an output end of a transformer, wherein an inductor is connected to the right end of the conductive connecting device, and a bearing neck of the camshaft is located in an induction heating zone in the middle of the inductor, a cooling device for rapidly cooling the bearing neck of the camshaft after being heated is arranged below the inductor, and the cooling device is insulated and fixedly connected to the conductive connecting device in an adjustable vertical position through a plurality of connecting components; wherein the cooling device comprises a water spray ring, the water spray ring is an annular structure made of a hollow tube, a plurality of water spray holes arranged toward the bearing neck of the camshaft are evenly distributed on the inner ring wall of the water spray ring, and a plurality of water inlet pipes connected to a water supply pipe and supplying water to the inside of the water spray ring are evenly distributed on the circumference of the outer ring wall of the water spray ring.

[0006] Wherein, the center of the water spray hole is arranged perpendicular to the central axis of the water spray ring.

[0007] Furthermore, the cooling water tank in the conductive connection device is an inverted L-shaped structure, and the multiple groups of connection components are located at the lower right of the cooling water tank and are insulated and fixedly connected to the two transmission boards in the conductive connection device and the insulating board between the two transmission boards.

[0008] Furthermore, the connecting assembly includes a long bolt, on which a long sleeve is mounted, and the long bolt and the long sleeve pass through the through holes on the two transmission boards and the insulating board, a plurality of vertically arranged waist-shaped long holes are formed on the connecting plate, and the long sleeve passes through the waist-shaped long holes, three insulating washers arranged between the transmission board and the connecting plate are mounted on the long sleeve, and two insulating washers and two brass washers mounted on the ends of the long sleeve are located on the outside of the connecting plate, the end of the long bolt is adapted to be connected with two nuts located at the outer end of the long sleeve, and the right ends of the two connecting plates are fixedly connected to the water spray ring.

[0009] Furthermore, the conductive connection device includes two transmission boards and a cooling water tank of the same shape, the outer sides of the left ends of the two transmission boards are fixedly connected with contact plates for connecting to the output end of the transformer, the outer plate surfaces of the two transmission boards are fixed with cooling water tanks connected to the water supply pipe, the right ends of the two transmission boards and the cooling water tank are fixedly connected to the inductor, an insulating plate is sandwiched between the two transmission boards, and the two transmission boards and the insulating plate are fixedly connected together by an insulating connection assembly located between the cooling water tank and the contact plate.

[0010] Furthermore, a pipe joint communicating with the interior of the cooling water tank and connected to a water supply pipe is provided on the outer side wall of the cooling water tank.

[0011] Furthermore, the insulating connection assembly includes a short bolt, on which a short copper sleeve is mounted, and the short bolt and the short copper sleeve pass through the through holes on the two transmission boards and the insulating board, and the two ends of the short copper sleeve are sequentially mounted with an insulating washer 1 and a brass washer 1 located on the outside of the transmission board, and the two transmission boards are insulated and fixedly connected by a nut 1 provided at the outer end of the short copper sleeve and adapted to be connected to the short bolt.

[0012] Furthermore, the connection assembly is insulated and fixedly connected to the two power transmission boards.

[0013] Furthermore, the inner hole diameter of the water spray ring is 15-30 mm larger than the outer diameter of the inductor, and the distance between the water spray ring and the inductor is no more than 50 mm.

[0014] Furthermore, the rotation speed of the camshaft in the induction heating zone is 150-180 r / min, and the descending speed of the camshaft is 60-80 mm / min.

[0015] The advantages of this utility model compared with the prior art:

[0016] 1. This technical solution optimizes the structure of the cooling device and makes it insulated and fixedly connected with the conductive connecting device through multiple sets of connecting components in an adjustable vertical position, thereby increasing the quenching cooling time, improving the cooling effect and ensuring the quenching effect without increasing the equipment cost and ensuring the production efficiency and processing quality.

[0017] 2. This technical solution increases the cooling time while controlling the heating time, and combines the induction heating zone with an annular structure to solve the problem of soft spots and soft bands caused by the camshaft bearing neck not reaching the required temperature during camshaft induction quenching, increases the heating temperature of the camshaft bearing neck, and increases the hardness of the base circle after quenching, so that the cam can meet the design requirements after induction quenching;

[0018] 3. This technical solution reduces the rotation speed and descent speed of the camshaft under the premise of increasing the heating and cooling time, which can effectively prevent the appearance of spiral lines during the descent process, affecting the heating and quenching effects, so that the parts meet the design requirements after induction quenching;

[0019] 4. This technical solution has a simple structure, novel design, easy operation, reduces equipment costs, improves product quality, and broadens processing ideas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the front view of the structure of the utility model;

[0021] Figure 2 It is a top view of the structure of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiment of the present utility model Figure 1-2 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that, in this article, unless otherwise stated, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations. The elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0025] Induction hardening device for camshafts of marine diesel engines, such as Figure 1-2As shown, it includes a conductive connecting device 1 electrically connected to the output end of the transformer, the right end of the conductive connecting device 1 is connected to an inductor 2, and the bearing neck of the camshaft is located in the induction heating zone 4 in the middle of the inductor 2, and a cooling device for quickly cooling the heated camshaft bearing neck is provided below the inductor 2, and the cooling device is insulated and fixedly connected to the conductive connecting device 1 in an adjustable vertical position through multiple groups of connecting components; wherein, the cooling device includes a water spray ring 3, the water spray ring 3 is an annular structure made of a hollow tube, a plurality of water spray holes arranged toward the bearing neck of the camshaft are evenly distributed on the inner ring wall of the water spray ring 3, and a plurality of water inlet pipes 5 connected to the water supply pipe and supplying water to the inside of the water spray ring 3 are evenly distributed on the circumference of the outer ring wall of the water spray ring 3; specifically, the center of the water spray hole is perpendicular to the central axis of the water spray ring 3 and is arranged The water spray ring 3 is a hollow structure, and the cooling water sprayed from the multiple water spray holes on the water spray ring 3 cools the camshaft bearing neck; in the above structure, without increasing the equipment cost and ensuring the production efficiency and processing quality, by optimizing the structure of the cooling device, and making it vertically position adjustable and insulated and fixedly connected with the conductive connecting device 1 through multiple groups of connecting components, the vertical distance between the water spray ring 3 and the inductor 2 is adjusted, the quenching cooling time is increased, the cooling effect is improved, and the quenching effect is guaranteed; while increasing the cooling time, the heating time is controlled, and combined with the induction heating zone 4 of the ring structure, the disadvantages of the camshaft bearing neck not reaching the required temperature during the camshaft induction quenching and the generation of soft spots and soft belts are solved, the heating temperature of the camshaft bearing neck is increased, the hardness of the base circle after quenching is increased, and the cam meets the design requirements after induction quenching;

[0026] The cooling water tank 1-2 in the conductive connection device 1 is an inverted L-shaped structure, and multiple groups of connection components are located at the lower right of the cooling water tank 1-2 and are insulated and fixedly connected with the two transmission boards 1-1 in the conductive connection device 1 and the insulating board 1-3 between the two transmission boards 1-1; Specifically, the specific structure of the connection component is as follows: the connection component includes a long bolt 6, and the long bolt 6 is sleeved with a long sleeve 7, and the long bolt 6 and the long sleeve 7 pass through the through holes on the two transmission boards 1-1 and the insulating board 1-3, and the connection plate 9 is formed with a plurality of waist-shaped long holes arranged vertically, and the long sleeve 7 passes through The waist-shaped long hole is set, the insulating washer 3 8 set between the transmission board 1-1 and the connecting plate 9 is sleeved on the long sleeve 7, and the insulating washer 2 10 and the brass washer 2 11 sleeved on the end of the long sleeve 7 are located on the outside of the connecting plate 9, the end of the long bolt 6 is adapted to be connected with the nut 2 12 located at the outer end of the long sleeve 7, and the right ends of the two connecting plates 9 are fixedly connected to the water spray ring 3; in the above structure, the waist-shaped long hole vertically set on the connecting plate 9 is used to adjust the vertical distance between the water spray ring 3 and the inductor 2, and the quenching effect of the camshaft bearing neck is ensured by adjusting the distance between the two;

[0027] The specific structure of the conductive connection device 1 is as follows: the conductive connection device 1 comprises two transmission boards 1-1 of the same shape and a cooling water tank 1-2, the outer sides of the left ends of the two transmission boards 1-1 are fixedly connected with contact plates 1-4 for connecting to the output end of the transformer, the outer side plates of the two transmission boards 1-1 are fixed with cooling water tanks 1-2 connected to the water supply pipe, the cooling water tanks 1-2 are arranged to receive circulating cooling water during induction quenching, take away the heat generated by the two transmission boards 1-1 and the inductor 2, and are also used to fix and support the inductor 2; the right ends of the two transmission boards 1-1 and the cooling water tank 1-2 are fixedly connected to the inductor 2, an insulating plate 1-3 is sandwiched between the two transmission boards 1-1, and the two transmission boards 1-1 and the insulating plate 1-3 are fixedly connected together through an insulating connection assembly located between the cooling water tank 1-2 and the contact plate 1-4; specifically, the outer side wall of the cooling water tank 1-2 is provided with a pipe joint 1-5 which is communicated with the interior thereof and connected to the water supply pipe.

[0028] The specific structure of the insulating connection assembly is as follows: the insulating connection assembly includes a short bolt 1-6, on which a short copper sleeve 1-10 is sleeved, and the short bolt 1-6 and the short copper sleeve 1-10 pass through the through holes on the two transmission boards 1-1 and the insulating board 1-3, and the two ends of the short copper sleeve 1-10 are sequentially sleeved with an insulating washer 1-7 and a brass washer 1-8 located on the outside of the transmission board 1-1, and the two transmission boards 1-1 are insulated and fixedly connected by a nut 1-9 provided at the outer end of the short copper sleeve 1-10 and adapted to be connected to the short bolt 1-6; specifically, the connection assembly is insulated and fixedly connected to the two transmission boards 1-1.

[0029] In order not to affect the heating effect of the inductor 2, the inner diameter of the water spray ring 3 is 20 mm larger than the outer diameter of the inductor 2, and the distance between the water spray ring 3 and the inductor 2 is 40 mm.

[0030] All welds of this structure are brazed with brass, and after cleaning the welds, they are tested with 0.2-0.3MPa water pressure, and no leakage is allowed; tap water at 20-30℃ is used as the quenching medium.

[0031] The rotation speed of the camshaft in the induction heating zone 4 is 150-180 r / min, and the descending speed of the camshaft is 60-80 mm / min.

[0032] This technical solution reduces the camshaft rotation speed and descent speed under the premise of increasing the heating and cooling time, which can effectively prevent the appearance of spiral lines during the descent process, affecting the heating and quenching effects, so that the parts meet the design requirements after induction quenching; the solution has a simple structure, novel design, easy operation, reduced equipment costs, improved product quality, and broadened processing ideas.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An induction hardening device for a camshaft of a marine diesel engine, comprising a conductive connection device (1) electrically connected to an output end of a transformer, wherein the right end of the conductive connection device (1) is connected to an induction body (2), and a bearing journal of the camshaft is located in an induction heating zone (4) in the middle of the induction body (2), characterized in that: A cooling device for rapidly cooling the heated camshaft bearing neck is provided below the inductor (2), and the cooling device is insulated and fixedly connected to the conductive connection device (1) in an adjustable vertical position via a plurality of connection components; wherein the cooling device comprises a water spray ring (3), the water spray ring (3) being an annular structure made of a hollow tube, a plurality of water spray holes arranged toward the camshaft bearing neck being evenly distributed on the inner ring wall of the water spray ring (3), and a plurality of water inlet pipes (5) connected to a water supply pipe and supplying water to the inside of the water spray ring (3) being evenly distributed on the outer ring wall of the water spray ring (3).

2. The induction hardening device for a camshaft of a marine diesel engine according to claim 1, characterized in that: The center of the water spray hole is arranged perpendicular to the central axis of the water spray ring (3).

3. The induction hardening device for a camshaft of a marine diesel engine according to claim 1, characterized in that: The cooling water tank (1-2) in the conductive connection device (1) is an inverted L-shaped structure, and the plurality of connection components are located at the lower right side of the cooling water tank (1-2) and are insulated and fixedly connected to the two power transmission plates (1-1) in the conductive connection device (1) and the insulating plate (1-3) between the two power transmission plates (1-1).

4. The induction hardening device for a camshaft of a marine diesel engine according to claim 3, characterized in that: The connection assembly comprises a long bolt (6), a long sleeve (7) is sleeved on the long bolt (6), and the long bolt (6) and the long sleeve (7) pass through the through holes on the two power transmission plates (1-1) and the insulating plate (1-3); a plurality of waist-shaped long holes are formed on the connecting plate (9) and the long sleeve (7) passes through the waist-shaped long holes; a third insulating washer (8) is sleeved on the long sleeve (7) and a second insulating washer (10) and a second brass washer (11) sleeved on the end of the long sleeve (7) are located outside the connecting plate (9); a second nut (12) located on the outer end of the long sleeve (7) is adapted to be connected to the end of the long bolt (6); and the right ends of the two connecting plates (9) are fixedly connected to the water spray ring (3).

5. The induction hardening device for a camshaft of a marine diesel engine according to claim 1, characterized in that: The conductive connection device (1) comprises two transmission boards (1-1) of the same shape and a cooling water tank (1-2); the outer sides of the left ends of the two transmission boards (1-1) are fixedly connected with a contact plate (1-4) for connecting to the output end of the transformer; the outer plate surfaces of the two transmission boards (1-1) are fixed with a cooling water tank (1-2) connected to a water supply pipe; the right ends of the two transmission boards (1-1) and the cooling water tank (1-2) are fixedly connected to an inductor (2); an insulating plate (1-3) is sandwiched between the two transmission boards (1-1); and the two transmission boards (1-1) and the insulating plate (1-3) are fixedly connected together via an insulating connection assembly located between the cooling water tank (1-2) and the contact plate (1-4).

6. The induction hardening device for a camshaft of a marine diesel engine according to claim 5, characterized in that: The outer wall of the cooling water tank (1-2) is provided with a pipe joint (1-5) which is in communication with the interior of the cooling water tank (1-2) and connected to a water supply pipe.

7. The induction hardening device for a camshaft of a marine diesel engine according to claim 6, characterized in that: The insulating connection assembly comprises a short bolt (1-6), a short copper sleeve (1-10) being sleeved on the short bolt (1-6), and the short bolt (1-6) and the short copper sleeve (1-10) passing through through holes on two transmission boards (1-1) and an insulating board (1-3), and an insulating washer (1-7) and a brass washer (1-8) being sleeved on both ends of the short copper sleeve (1-10) and located outside the transmission board (1-1), and the two transmission boards (1-1) are insulated and fixedly connected by a nut (1-9) provided at the outer end of the short copper sleeve (1-10) and adapted to be connected to the short bolt (1-6).

8. The induction hardening device for a camshaft of a marine diesel engine according to claim 7, characterized in that: The connection assembly is insulated and fixedly connected to the two power transmission boards (1-1).

9. The induction hardening device for a camshaft of a marine diesel engine according to any one of claims 1 to 8, characterized in that: The inner hole diameter of the water spray ring (3) is 15 to 30 mm larger than the outer diameter of the inductor (2), and the distance between the water spray ring (3) and the inductor (2) is no more than 50 mm.

10. The induction hardening device for a camshaft of a marine diesel engine according to claim 9, characterized in that: The rotation speed of the camshaft in the induction heating zone (4) is 150-180 r / min, and the descending speed of the camshaft is 60-80 mm / min.

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