Induction heating device

Abstract

The utility model discloses an induction heating device, comprising a heating chamber used for accommodating at least a part of a workpiece; the induction heater extends into the heating chamber and is used for carrying out induction heating on the workpiece; and the air supply assembly communicates with the heating cavity and is used for introducing inert gas into the heating cavity to replace air in the heating cavity. According to the induction heating device, an inert gas environment can be provided, it is guaranteed that workpieces cannot be oxidized in the induction heating process, and the cleanliness of the surfaces of the workpieces is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to induction heating technical field more specifically, relate to a kind of induction heating device. BACKGROUND

[0002] Induction heating is a kind of induction current inside workpiece, rapidly heats workpiece surface method, is widely used in industrial field needs fast, even effective heating application scene.

[0003] In the actual production process, inductor heats workpiece, is influenced by heating temperature, heating speed and surrounding environment, workpiece and air contact can produce oxide skin, oxide skin drop will influence the surface cleanliness of final workpiece, influence workpiece forming effect.

[0004] Summarized above, how to avoid workpiece surface oxide skin when induction heating, is the problem that present field technical personnel urgently solves. UTILITY MODEL CONTENT

[0005] Therefore, the utility model discloses the purpose is to provide a kind of induction heating device, by gas supply assembly into inert gas to the heating chamber of workpiece, avoid workpiece induction heating and produce oxide skin, guarantee workpiece induction heating and the cleanliness of surface, guarantee the processing effect of workpiece.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A kind of induction heating device, comprising:

[0008] Heating chamber, for accommodating at least part of site of workpiece;

[0009] Induction heater, extends into the heating chamber, for the induction heating of the workpiece;

[0010] Gas supply assembly, is communicated with the heating chamber, for the inert gas of the heating chamber is communicated to replace its internal air.

[0011] Preferably, the gas supply assembly includes:

[0012] Nitrogen tank;

[0013] Connecting pipeline, for connecting the nitrogen tank and the heating chamber;

[0014] Adjusting piece, is located on the connecting pipeline, for adjusting the nitrogen amount of the nitrogen tank into the heating chamber.

[0015] Preferably, the heating chamber is equipped with at least one visualization window, for observing the surface state when the workpiece is heated to start the adjusting piece.

[0016] Preferably, the adjusting member is a flow meter arranged on the communication pipeline.

[0017] Preferably, a pressure regulating valve is arranged on the nitrogen tank for regulating the nitrogen pressure output from the nitrogen tank to the communication pipeline.

[0018] Preferably, the heating chamber is of a frame structure, at least one side of the heating chamber is a transparent panel to form the visual window.

[0019] The top of the heating chamber is provided with a mounting port of the workpiece, and the bottom of the heating chamber is used for supporting the workpiece.

[0020] Preferably, the bottom of the heating chamber is provided with a rotating tool for supporting and rotating the workpiece.

[0021] Preferably, the top of the heating chamber and the side of the heating chamber are openably connected.

[0022] Preferably, the first through port of the side of the heating chamber and the communication pipeline are sealingly connected, and the second through port of the side of the heating chamber and the induction heater are sealingly connected.

[0023] Preferably, the mounting chamber and the induction heater are arranged on the machine tool.

[0024] The induction heating device provided by the utility model, including heating chamber, induction heater and gas supply assembly, wherein the heating chamber is used for accommodating at least part of the workpiece, the induction heater is inserted into the heating chamber to contact the workpiece to realize the effect of quickly and effectively heating the workpiece, and the gas supply assembly is connected with the heating chamber to replace the air in the heating chamber with inert gas, so that the inert gas does not react with the workpiece during heating of the workpiece, the problem of affecting the cleanliness of the workpiece due to the generation of oxide skin on the surface of the workpiece during heating of the workpiece is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0026] Figure 1 It is a structural schematic diagram of the induction heating device provided by the utility model.

[0027] Figure 1 In the drawings, reference numerals include:

[0028] 1 - heating chamber; 2 - induction heater; 3 - workpiece; 5 - gas supply assembly; 11 - first through port; 12 - second through port; 13 - mounting port; 14 - third through port; 21 - busbar; 22 - induction coil; 51 - communication pipeline; 52 - adjusting member; 53 - pressure regulating valve; 54 - nitrogen tank. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] The core of the utility model is to provide an induction heating device, which can provide an inert gas environment, ensure that the workpiece will not be oxidized during induction heating, and ensure the cleanliness of the workpiece surface.

[0031] The induction heating device provided by the utility model comprises a heating chamber 1, an induction heater 2 and a gas supply assembly 5, please refer to Figure 1 .

[0032] The heating chamber 1 is used for accommodating at least part of the workpiece 3, that is, the workpiece 3 can be entirely arranged in the heating chamber 1 or partially arranged in the heating chamber 1. For example, part of the workpiece 3 will not be processed after induction heating, such as the sprocket part of the crankshaft, so it is necessary to provide an environment that will not be oxidized during induction heating to avoid the oxidation of the workpiece surface during induction heating. For some induction heating parts, polishing process is still needed after heating, that is, even if the part is oxidized, it will not have any effect, so there is no need to provide an environment that will not be oxidized. Of course, if the workpiece 3 will not be processed after induction heating, and the process requires a higher cleanliness of the workpiece 3, the workpiece 3 can be entirely arranged in the heating chamber 1.

[0033] In the above process, the part of the workpiece 3 that is specifically induction heated is the induction heater 2, the induction heater 2 specifically comprises a busbar 21 and an induction coil 22 electrically connected thereto, the busbar 21 is used for connecting a power supply, and when current passes through the induction coil 22, a high-speed changing alternating magnetic field is generated. The workpiece 3 that is induction heated by the induction heater 2 is specifically a metal material, when the magnetic force line in the magnetic field passes through the magnetically conductive metal material, countless small eddy currents are generated in the workpiece 3, so that the workpiece 3 itself is rapidly heated, and the process of induction heating is realized.

[0034] The non-oxidizing heating environment for the workpiece 3 is provided by the gas supply assembly 5, which specifically introduces inert gas into the heating chamber 1 to replace the air in the heating chamber 1, so that the heating chamber 1 is filled with inert gas or mostly filled with inert gas, so that the workpiece 3 is not oxidized or the possibility of oxidation is reduced during induction heating. The inert gas can be nitrogen, argon, helium, etc., which will not react with the surface of the workpiece 3 during induction heating of the workpiece, avoiding the formation of oxide scale on the surface of the workpiece 3 and ensuring the cleanliness of the surface of the workpiece 3.

[0035] Specifically, the gas supply assembly 5 can intermittently introduce inert gas into the heating chamber 1. In this case, the sealing performance of the heating chamber 1 is not strong, and some gas leakage may occur in the heating chamber 1 when the workpiece 3 is put in or taken out or the workpiece 3 is heated. Therefore, it is necessary to supplement the inert gas in the heating chamber 1 to ensure the environment in the heating chamber 1.

[0036] Alternatively, the gas supply assembly 5 can intermittently introduce inert gas into the heating chamber 1. In this case, the sealing performance of the heating chamber 1 is good, and some gas leakage may occur in the heating chamber 1 when the workpiece 3 is put in or taken out or the workpiece 3 is heated. Therefore, it is necessary to supplement the inert gas in the heating chamber 1 to maintain the amount of gas in the heating chamber 1 within a certain range and ensure the processing quality of the workpiece 3.

[0037] Alternatively, the gas supply assembly 5 can continuously introduce inert gas into the heating chamber 1. In this case, the gas flow in the heating chamber 1 is circulating, maintaining the non-oxidizing induction heating environment in the heating chamber, ensuring the stability of the gas flow in the heating chamber 1, and ensuring the processing quality of the workpiece 3. If the processing quality of the workpiece 3 is required to be high, and the sealing performance of the heating chamber 1 cannot meet the requirements, this gas supply mode can be used.

[0038] In addition, one workpiece 3 can be placed in the heating chamber 1 during the above process, or two or more workpieces 3 can be placed in the heating chamber 1. The actual working conditions can be flexibly set and changed.

[0039] In the case of placing one workpiece 3 in the heating chamber 1, multiple workpieces 3 can be sequentially placed in the heating chamber 1 for non-oxidizing induction heating process.

[0040] When using the induction heating device, after the workpiece 3 is fixed, the gas supply assembly 5 is started for a period of time to ensure that the air in the heating chamber 1 is exhausted, and then the induction heater 2 is started. The amount of nitrogen gas in the heating chamber 1 during induction heating is ensured to avoid the production of oxide scale on the surface of the workpiece 3.

[0041] Based on the above embodiments, please refer to Figure 1The gas supply assembly 5 comprises a nitrogen tank 54 and a communication pipeline 51 for connecting the nitrogen tank 54 and the heating chamber 1 to supply nitrogen in the nitrogen tank 54 into the heating chamber 1 to replace the air in the heating chamber 1 with nitrogen, so as to ensure the non-oxidizing induction heating environment, avoid the generation of oxide skin on the surface of the workpiece 3, ensure the cleanliness of the surface of the workpiece 3, and ensure the processing quality of the workpiece 3.

[0042] The adjusting member 52 is arranged on the communication pipeline 51 and used for adjusting the amount of nitrogen supplied from the nitrogen tank 54 into the heating chamber 1.

[0043] In one specific embodiment, the operation motive of the adjusting member 52 is determined by the amount of nitrogen in the heating chamber 1. When it is required to keep the amount of nitrogen in the heating chamber 1 within a certain range, if the amount of nitrogen is found to be low through detection by the detection element, the adjusting member 52 needs to be operated to increase the amount of gas in the heating chamber 1.

[0044] In another specific embodiment, the operation motive of the adjusting member 52 is determined by the surface state of the workpiece 3 in the heating chamber 1. When the surface state changes from metal color to yellow or black oxidation, the amount of nitrogen supplied into the heating chamber 1 is increased, so as to reduce or avoid the oxidation of the surface of the workpiece 3 by increasing the flow of nitrogen until the surface state of the workpiece 3 meets the requirement.

[0045] It should be noted that the adjusting member 52 in the embodiment can also realize the functions of cutting off or connecting the nitrogen tank 54 and the heating chamber 1.

[0046] On the basis of any of the above embodiments, the heating chamber 1 is provided with at least one visual window for observing the surface state of the workpiece 3 during heating to start the adjusting member 52.

[0047] Through the arrangement of the visual window, the operator can easily observe the surface state of the workpiece 3 during heating. If the surface oxidation occurs during heating, the adjusting member 52 is used to adjust the nitrogen flow from the nitrogen tank 54 into the heating chamber 1 to reduce the oxidation degree of the surface of the workpiece 3 until the surface state of the workpiece 3 meets the operation requirement, for example, the appearance color of the surface is metal color.

[0048] After the state of the workpiece 3 surface is adjusted according to the operation requirements, the state of the adjusting member 52 is fixed, the speed of the nitrogen flowing into the heating chamber 1 is kept at this time, the nitrogen flow in the heating chamber 1 is ensured, and the normal workpiece induction heating process is started; after the induction heating is completed, the workpiece 3 is moved out as a whole or the part of the workpiece 3 extending into the heating chamber 1 is moved out, that is, the induction heating process of the workpiece 3 is completed, and the workpiece 3 surface will not produce the oxide skin, so as to ensure the cleanliness of the workpiece 3 surface. The waiting time here can be 8-10s, and the workpiece 3 surface temperature is reduced to a temperature value at which oxidation will not occur, and then the workpiece 3 is moved out, so that the oxide skin will not be formed again.

[0049] For a certain workpiece 3, in the actual production process, the adjusting member 52 has a preset value, which is a theoretical value or a practical experience value that can satisfy the surface of the workpiece 3 part during induction heating without oxidation; after the induction heater 2 is started, with the heating process, if it is observed through the visual window that the workpiece 3 has oxidation discoloration, the adjusting member 52 can be adjusted again, so as to effectively control the surface oxidation degree of the workpiece 3 during the heating process.

[0050] On the basis of any of the above embodiments, the adjusting member 52 is a flow meter arranged on the communication pipeline 51. The flow meter can display the flow on one hand, and has the effect of adjusting the nitrogen flow on the other hand, so as to ensure the effective control of the surface oxidation degree of the workpiece 3 and ensure the cleanliness of the induction heating part of the workpiece 3.

[0051] On the basis of any of the above embodiments, the nitrogen tank 54 is provided with a pressure regulating valve 53 for regulating the nitrogen pressure output from the nitrogen tank 54 to the communication pipeline 51.

[0052] The process of the nitrogen tank 54 introducing nitrogen into the heating chamber 1 is uninterrupted, so the nitrogen tank 54 is usually large, and the nitrogen pressure in the tank is also large. In order to reliably and stably introduce the nitrogen into the heating chamber 1, the output pressure of the nitrogen tank 54 is regulated through the pressure regulating valve 53, and then the reduced pressure is sent into the heating chamber 1 through the communication pipeline 51.

[0053] The specific pressure regulating valve 53 can be adjusted manually, and the output pressure before and after the operation of the pressure regulating valve 53 can be detected by a pressure detecting element to determine the reliable tank output pressure applicable to the heating chamber 1.

[0054] On the basis of any of the above embodiments, the heating chamber 1 has a frame structure, and at least one side of the heating chamber 1 is a transparent panel to form a visual window.

[0055] The transparent panel can be made of organic glass. By setting the side of the heating chamber 1 to be transparent, the surface state of the workpiece 3 can be observed at any time during induction heating, so as to control the oxidation degree of the surface of the workpiece 3 and ensure the processing quality of the workpiece 3.

[0056] At least one side of the heating chamber 1 is set to be transparent. If the surface of the fixed workpiece 3 is heated, the induction heating condition of a certain part can be observed by setting the corresponding side of the heating chamber 1 to be transparent. If the workpiece 3 needs to be rotated, all the sides of the heating chamber 1 are set to be transparent.

[0057] For example, when the workpiece 3 is a crankshaft, the sprocket part of the crankshaft will not be processed after induction heating, that is, the heating is completed and the final state is obtained. However, the crankshaft is in high-speed operation, and therefore the surface cleanliness has high requirements. In this case, the sprocket part is inserted into the heating chamber 1, and induction heating is performed in a nitrogen environment. In fact, the crankshaft is rotated during induction heating. In order to observe the rotation of the crankshaft and the induction heating condition of the crankshaft, the four sides of the heating chamber 1 are made of organic glass.

[0058] The bottom of the heating chamber 1 is used to support the workpiece 3, and can be made of stainless steel to ensure the reliability of the whole heating chamber 1.

[0059] The top of the heating chamber 1 is used for the workpiece 3 to pass in and out of the heating chamber 1, and is provided with a mounting port 13 for convenient operation. During the process of the workpiece 3 passing in and out of the mounting port 13, nitrogen will be lost to the outside. Therefore, the nitrogen tank 54 is used to continuously supply nitrogen into the heating chamber 1 to ensure the flow of nitrogen in the heating chamber 1.

[0060] On the basis of any of the above embodiments, the bottom of the heating chamber 1 is provided with a rotating tool 6, which is used to support the workpiece 3 and drive the workpiece 3 to rotate.

[0061] Please refer to Figure 1 The bottom of the heating chamber 1 is provided with a third opening 14, and the rotating tool 6 is inserted into the third opening 14 to support the workpiece 3 and drive the workpiece 3 to rotate in the heating chamber 1, so as to perform induction heating and achieve the effect of rapid heating of the workpiece 3.

[0062] The power for rotating the rotating tool 6 can be provided by a driving member. The driving member is started and stopped to start and stop the rotation of the workpiece 3. After the heating is completed, the driving member is stopped, and the workpiece 3 is taken out after waiting for a period of time in the heating chamber 1.

[0063] On the basis of any of the above embodiments, the top of the heating chamber 1 and the side of the heating chamber 1 can be connected in an openable and closable manner.

[0064] The openable connection here refers to openable and / or closable side and / or top. Through the openable connection of the top and the side, the position of the workpiece 3 in the heating chamber 1 can be adjusted, and the workpiece 3 can be replaced or removed, which is convenient for operation.

[0065] As a preferred embodiment, the top of the heating chamber 1 is openable or closable, which is convenient for debugging the workpiece 3 and the rotating tool 6.

[0066] In the embodiment, the heating chamber 1 is relatively sealed. The relatively sealed here refers to that the communication pipeline 51 and the induction heater 2 are both connected to the communication port of the heating chamber 1 with a gap. In combination with the openable and closable top of the heating chamber 1, in the actual operation process, the nitrogen gas will flow out from the inside of the heating chamber 1 to the outside through the mounting port 13 and the communication port of the heating chamber 1. Based on the continuous supply of nitrogen gas from the nitrogen tank 54, the stability and reliability of the circulation of nitrogen gas in the heating chamber 1 are ensured, the induction heating environment of the workpiece 3 is ensured, and the surface cleanliness of the workpiece 3 is ensured.

[0067] On the basis of any of the above embodiments, the first port 11 of the side of the heating chamber 1 is sealingly connected to the communication pipeline 51, and the induction heater 2 is sealingly connected to the second port 12 of the side of the heating chamber 1, so that the nitrogen gas in the heating chamber 1 can flow out to the outside through the mounting port 13 of the top of the heating chamber 1.

[0068] As a preferred embodiment, the mounting port 13 and the first port 11 can be arranged opposite to each other, so as to facilitate the circulation of nitrogen gas.

[0069] On the basis of any of the above embodiments, the machine tool 4 is further included, and the heating chamber 1 and the induction heater 2 are arranged on the machine tool 4.

[0070] Please refer to Figure 1 The machine tool 4 is connected to the induction heater 2, which ensures the reliable stability of the induction heater 2 extending into the heating chamber 1 for induction heating. The heating chamber 1 is fixed on the machine tool 4. If the induction heating is performed on the crankshaft, the heating chamber 1 can be arranged to be relatively small, which can accommodate the induction heating part. The crankshaft is rotatably connected to the support member on the machine tool 4 when the induction heating is performed, which ensures the reliable stability of the crankshaft during the induction heating.

[0071] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other.

[0072] The above has carried out the detailed introduction to the induction heating device provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only used for helping to understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claim.

Claims

1. An induction heating device, characterized by, The utility model relates to a heating chamber (1) for accommodating at least part of a workpiece (3), an induction heater (2) extending into the heating chamber (1) for inductively heating the workpiece (3), and a gas supply assembly (5) communicating with the heating chamber (1) for supplying inert gas to the heating chamber (1) to replace air inside the heating chamber (1). The gas supply assembly (5) comprises a nitrogen tank (54), a communication pipeline (51) for communicating the nitrogen tank (54) with the heating chamber (1), and an adjusting member (52) arranged on the communication pipeline (51) for adjusting the amount of nitrogen supplied from the nitrogen tank (54) to the heating chamber (1). The heating chamber (1) is provided with at least one visual window for observing the surface state of the workpiece (3) during heating to start the adjusting member (52). The adjusting member (52) is a flow meter arranged on the communication pipeline (51).

2. The inductive heating device of claim 1, wherein, The nitrogen tank (54) is provided with a pressure regulating valve (53) for regulating the nitrogen pressure output from the nitrogen tank (54) to the communication pipeline (51). The heating chamber (1) has a frame structure, at least one side of the heating chamber (1) is a transparent panel to form the visual window. The top of the heating chamber (1) is provided with a mounting port (13) for the workpiece (3), and the bottom of the heating chamber (1) is used for supporting the workpiece (3). The bottom of the heating chamber (1) is provided with a rotating tool (6) for supporting and rotating the workpiece (3).

3. The inductive heating device of claim 2, wherein, The top of the heating chamber (1) and the side of the heating chamber (1) are connected in an openable and closable manner.

4. The inductive heating device of claim 2 or 3, wherein, The first through port (11) of the side of the heating chamber (1) is sealingly connected with the communication pipeline (51), and the second through port (12) of the side of the heating chamber (1) is sealingly connected with the induction heater (2).

5. The inductive heating device of claim 4, wherein, The heating chamber (1) and the induction heater (2) are arranged on the machine tool (4).

6. The inductive heating device of claim 3, wherein, ​ ​ 7. The inductive heating device of claim 1, wherein, ​ 8. The inductive heating device of claim 1, wherein, ​ 9. The inductive heating device of claim 6, wherein, ​ 10. The inductive heating device of claim 1, wherein, ​

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