CN-224218543-U - Crank red sleeve heating device

CN224218543UCN 224218543 UCN224218543 UCN 224218543UCN-224218543-U

Abstract

The utility model relates to a crank red sleeve heating device which comprises an electromagnetic induction heater, wherein the electromagnetic induction heater comprises a shell, an electromagnetic induction coil and a magnetizer, wherein the electromagnetic induction coil and the magnetizer are arranged in the shell, the magnetizer is used for fixing the electromagnetic induction coil, the shell comprises a front end plate and a rear end plate which are in a shape like a Chinese character 'hui', an outer pipe connected between the front end plate and the rear end plate and an inner pipe positioned in the outer pipe, a tubular cavity is formed by surrounding the electromagnetic induction coil and the magnetizer, an insulating and heat-insulating layer is arranged between the electromagnetic induction coil and the inner pipe, a cavity matched with a crank arm in shape is formed in the inner pipe, an air inlet and an air outlet are respectively arranged at two sides of the outer pipe, and a power connector connected with the electromagnetic induction coil is further arranged on the outer pipe. The full-surrounding square-tube-shaped electromagnetic induction heater has the advantages that the full-surrounding square-tube-shaped electromagnetic induction heater is arranged, the crank arm except the crank pin is placed in the electromagnetic induction heater to integrally heat the crank arm, the heating uniformity is higher, the integral deformation of the crank is uniform, and the processing quality of the red jacket is greatly improved.

Inventors

MA ZHIHONG
WANG MENGRU
ZHANG HUA
XIA LICHENG
HUANG JIAWEN
YANG CHENG
SHEN XIA
XU KAI

Assignees

上海船用曲轴有限公司

Dates

Publication Date: 20260508
Application Date: 20250530

Claims (6)

1. A crank red sleeve heating device comprises an electromagnetic induction heater, wherein the electromagnetic induction heater comprises a shell, an electromagnetic induction coil and a magnetizer, the electromagnetic induction coil is arranged in the shell, the magnetizer is used for fixing the electromagnetic induction coil, the electromagnetic induction heater is characterized in that the shell comprises a front end plate and a rear end plate which are in a shape like a Chinese character 'hui', an outer tube connected between the front end plate and the rear end plate, and an inner tube positioned in the outer tube, the front end plate, the rear end plate, the inner tube and the outer tube are jointly enclosed into an annular tubular cavity, the electromagnetic induction coil and the magnetizer are arranged around the inner tube, an insulating and heat-insulating layer is arranged between the electromagnetic induction coil and the inner tube, a cavity matched with a crank in shape is formed in the inner tube, an air inlet and an air outlet are respectively arranged on two sides of the outer tube, and a power connector connected with the electromagnetic induction coil is further arranged on the outer tube.
2. The crank red sleeve heating device according to claim 1, wherein a plurality of coil temperature sensors for measuring the temperature of the electromagnetic induction coil are further arranged in the tubular cavity, and a signal line interface for connecting the coil temperature sensors is arranged on the outer tube.
3. The crank red sleeve heating device according to claim 2, wherein the inner tube is further provided with a workpiece temperature sensor for measuring the temperature around the crank arm hole in the inner tube, and the outer tube is provided with a signal line interface for connecting the workpiece temperature sensor.
4. The device of claim 3, further comprising an air cooling assembly, wherein the air cooling assembly is in communication with the air inlet via an air pipe.
5. The device of claim 4, further comprising a controller in control connection with the air cooling assembly and capable of controlling connection with the signal line interface and the power connector via a cable.
6. The crank red sleeve heating device according to claim 5, wherein the crank red sleeve heating device comprises a plurality of electromagnetic induction heaters, the crank red sleeve heating device further comprises a lifting mechanism and a cabinet, a plurality of placing positions for placing the electromagnetic induction heaters are arranged on the cabinet, the lifting mechanism is provided with clamping jaws matched with the electromagnetic induction heaters in a shape, and the electromagnetic induction heaters on the placing positions can be lifted to stations nearby the cabinet.

Description

Crank red sleeve heating device Technical Field The utility model relates to the technical field of crank red jacket processing, in particular to a crank red jacket heating device. Background The crankshaft is the most important component in an engine, the engine drives the reciprocating motion of a connecting rod through a piston, and the reciprocating motion of the connecting rod is converted into torque output of the crankshaft through a crank. In a large low-speed marine diesel engine, a crankshaft often adopts a semi-combined structure due to the huge overall mass, and a main journal and a crank are spliced together through a red sleeve process. The term "jacket" means a joint body which is obtained by heating a crank to a predetermined temperature to expand the diameter of the hole, inserting a main journal at room temperature into the hole, and cooling the hole to generate a clamping force due to interference fit between the main journal and the crank hole. In the red envelope processing process, the bonding strength mainly considers the interference magnitude and the temperature. The minimum interference is controlled to ensure that the nesting part cannot loosen and skid, the maximum interference is controlled to ensure that the material of the nesting part is not damaged and deformed, and the temperature of the inner wall of the crank hole is controlled to be uniform so as to ensure the roundness of the nesting part and the processing quality of the red sleeve. In the red envelope processing process, the interference magnitude can be calculated by an empirical formula. How to obtain the uniformly distributed temperature of the inner wall of the crank hole to control irregular deformation becomes a key problem for improving the quality of the crank red sleeve. In the process of the crankshaft red jacket, the traditional heating mode mostly uses fuel gas as energy, so that the surface of the heated part is subjected to surface carbon and severe oxidation, the heating period of the fuel gas is long, the temperature distribution is uneven, and the deformation of the workpiece is difficult to control accurately. The current common heating means in the industry is by electromagnetic induction heating. The existing crank electromagnetic induction heating system mainly comprises an annular crank arm coil and a circular crank Kong Xianjuan. The crank arm coil is arranged on the periphery of the crank arm between the crank arm hole and the crank pin and is used for heating the crank arm between the crank arm hole and the crank pin. The arrangement mode is that the periphery of the crank hole is of an asymmetric structure, induction heating is carried out by arranging a single round coil on the inner side of the crank hole, uneven temperature fields and thermal deformation are formed in the adjacent area of the crank hole, and finally the required quality of the red jacket process cannot be ensured. By adopting the scheme, partial heating between the crank arm hole and the crank pin is compensated through the annular crank arm coil, so that the heating uniformity around the crank arm hole is improved. However, obviously, the scheme of combined heating still has difficulty in ensuring the uniformity of heating around the crank hole, so that the deformation of the crank is uneven, and the processing quality of the red jacket is affected. Therefore, there is a need for improvements and optimizations to existing red jacket devices to better meet user needs. Disclosure of utility model The embodiment of the utility model aims at solving the defects in the prior art by providing a crank red sleeve heating device. In order to achieve the above purpose, the embodiment of the utility model provides a crank red sleeve heating device which is realized by the following technical scheme: A crank red sleeve heating device comprises an electromagnetic induction heater, wherein the electromagnetic induction heater comprises a shell, an electromagnetic induction coil and a magnetizer, the electromagnetic induction coil is arranged in the shell, the magnetizer is used for fixing the electromagnetic induction coil, the electromagnetic induction heater is characterized in that the shell comprises a front end plate and a rear end plate which are in a shape like a Chinese character 'hui', an outer tube connected between the front end plate and the rear end plate and an inner tube positioned in the outer tube, a tubular cavity is formed by encircling the front end plate, the rear end plate, the inner tube and the outer tube, an insulating and heat-insulating layer is arranged between the electromagnetic induction coil and the inner tube, a cavity matched with a crank arm in shape is formed in the inner tube, an air inlet and an air outlet are respectively arranged at two sides of the outer tube, and a power connector connected with the electromagnetic induction coil is further arranged on the outer tube. The electromagnetic induct