Induction heating device and heat treatment equipment

Abstract

The present invention discloses an induction heating device and heat treatment equipment, belonging to the field of heat treatment technology, the induction heating device comprises at least two sections of hollow heating elements, a first through tube, a second through tube and a resistance control module, the at least two sections of heating elements are arranged in sequence along the axis direction of the workpiece to be processed, each section of the heating element is provided with an input channel and an output channel, the input channels of the at least two sections of the heating elements are connected to at least two first output ports one by one, the output channels of the at least two sections of the heating elements are connected to at least two second input ports one by one, and the resistance control module is arranged between each first output port and the input channel of the corresponding heating element. Each section of the heating element is connected in parallel with each other, and the input power of the at least two sections of the heating element can be adjusted according to different requirements on the workpiece to be processed, thereby improving the heating effect of the workpiece to be processed, improving the processing technology, and improving the qualified rate of the product.

Description

Technical Field

[0001] The present invention relates to the field of heat treatment technology, and in particular to an induction heating device and heat treatment equipment. Background Art

[0002] With the increasing popularity of automobiles and people's demand for automobiles, the manufacturing technology of automobile parts has also ushered in new opportunities and challenges. Induction hardening heat treatment is a very important special process in the processing of automobile parts, which greatly affects the various mechanical performance requirements of assembly parts. Axle parts such as the input shaft in the gearbox and the balance shaft in the balance module, as core components of the automobile, are required to have high surface wear resistance, yield strength, tensile strength and other mechanical properties. The heat treatment method of improving the mechanical properties of parts through overall induction quenching has become one of the main heat treatment processes for automobile parts due to its high efficiency and low cost.

[0003] However, with the development of the automotive industry and the diversification of parts shapes, the design and manufacture of induction coils have become a difficult point in the development of induction quenching processes. For example, for shaft parts, the hardened layer depth of the large-diameter journal is required to be 3mm-5mm. Due to the thicker material thickness in the large-diameter area, it requires a higher energy input to reach the austenite transformation temperature during the quenching heating process. The hardened layer depth of the small-diameter journal is required to be 1mm-2mm, and the energy input required to reach the austenite transformation temperature in the small-diameter area is smaller.

[0004] Because, at present, the input power of the overall induction coil in each section of the workpiece to be processed is consistent, and it is impossible to meet the hardening layer depth requirements of small and large journals at the same time. It often results in a situation of neglecting one while focusing on the other, which reduces the product qualification rate.

[0005] Therefore, it is urgent to provide an induction heating device and a heat treatment equipment to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an induction heating device, which can improve the processing technology and increase the qualified rate of products according to different hardening layer or surface hardness requirements on the parts to be processed.

[0007] Another object of the present invention is to provide a heat treatment device to improve the processing technology, heating effect and product qualification rate according to different hardening layer or surface hardness requirements on the parts to be processed.

[0008] In order to achieve the above objectives, the following technical solutions are provided:

[0009] An induction heating device, used for heating a workpiece to be processed, comprising:

[0010] At least two hollow heating elements are disposed on one side of the workpiece to be processed, and the at least two heating elements are sequentially spaced apart along the axis direction of the workpiece to be processed, and each heating element is provided with an input channel and an output channel;

[0011] A first through-tube, comprising a first body, a first input port and at least two first output ports, wherein the first input port is located at one side of the first body, and at least two first output ports are arranged at intervals along the vertical direction at the other side of the first body, and the input channels of at least two sections of the heating element are connected to the at least two first output ports in a one-to-one correspondence;

[0012] A second through pipe, comprising a second body, a second output port and at least two second input ports, wherein the output channels of at least two sections of the heating element are connected to the at least two second input ports in a one-to-one correspondence;

[0013] The resistance control module is arranged between each of the first output ports and the input channel of the corresponding heating element, and the resistance control module is used to adjust the resistance value of each section of the heating element.

[0014] As an optional scheme for the induction heating device, the resistance control module includes an insulating porcelain cylinder, a fixed platform, a sliding part and a resistance wire, one end of the insulating porcelain cylinder is connected to the input channel corresponding to the heating element, and the other end is connected to the first output port of the first through tube, the resistance wire is wound around the outer wall surface of the insulating porcelain cylinder, and the two ends of the resistance wire are respectively electrically connected to the input channel of the corresponding heating element and the first through tube, one end of the fixed platform is sleeved on the outer wall surface of the input channel corresponding to the heating element, and the other end is slidably provided with the sliding part, and one end of the sliding part is abutted against the resistance wire.

[0015] As an optional solution for the induction heating device, the other end of the sliding member away from the resistance wire is provided with a toggle portion, and the toggle portion is made of insulating material.

[0016] As an optional solution for the induction heating device, the resistance control module further includes a cover body, the cover body opening faces downward and can be movably clamped on the outer wall surface of the fixing platform.

[0017] As an optional solution of the induction heating device, an insulating layer is provided between two adjacent sections of the heating element, and two opposite side surfaces of the insulating layer are respectively in contact with the corresponding two sections of the heating element.

[0018] As an optional solution of the induction heating device, two ends of the insulating porcelain cylinder are respectively sealed and plugged with the corresponding first output port and the corresponding input channel of the heating element.

[0019] As an optional solution of the induction heating device, the induction heating device includes three sections of the heating element, which are:

[0020] The first segmented heating element, the second segmented heating element and the third segmented heating element are arranged in sequence from top to bottom, and the second output port is located below the output channel of the third segmented heating element.

[0021] As an optional scheme for the induction heating device, the first segmented heating element includes a first segmented input channel, a first segmented heating body and a first segmented output channel which are connected in sequence, the first segmented input channel and the first segmented output channel are respectively perpendicular to the two ends of the first segmented heating body, and the extension direction of the first segmented input channel is spatially perpendicular to the extension direction of the first segmented output channel.

[0022] As an optional solution for the heat treatment equipment, it includes an AC power supply and the induction heating device, and the AC power supply is electrically connected to the first through-tube and the second through-tube respectively.

[0023] As an optional solution of the heat treatment equipment, the heat treatment equipment further includes a cooling circulation device, the output end of the cooling circulation device is connected to the first through pipe, and the return end of the cooling circulation device is connected to the second through pipe.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides an induction heating device, in which at least two sections of hollow heating elements are spaced apart along the axial direction of a workpiece to be processed, the input channel of each section of the heating element is connected to the corresponding first output port on the first through tube, and the output channel of each section of the heating element is connected to the corresponding second input port on the second through tube, so that each section of the heating element is connected in parallel with each other, and a resistance control module is provided between the corresponding first output port and the corresponding output channel of each section of the heating element to achieve the function of adjusting the resistance value of each section of the heating element connected, and the resistance value of the resistance control module can be adjusted according to different hardening layer or surface hardness requirements on the workpiece to be processed, so as to achieve the regulation of the input power of at least two sections of the heating elements, that is, the heating power of the workpiece to be processed is regulated in sections, so as to improve the processing technology and help improve the qualified rate of the product.

[0026] The heat treatment equipment provided by the present invention can adjust the power in sections according to different hardening layers or surface hardness requirements on the workpiece to be processed, thereby improving the heating effect, improving the processing technology, and increasing the qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of an induction heating device in an embodiment of the present invention;

[0028] Figure 2for Figure 1 A partial enlarged view of the middle A;

[0029] Figure 3 Schematic diagram of the structure of the first through pipe in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the second through pipe in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the first segmented heating element in an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. First segment heating element; 11. First segment input channel; 12. First segment heating body; 13. First segment output channel; 2. Second segment heating element; 3. Third segment heating element;

[0034] 4. first through pipe; 41. first body; 42. first input port; 43. first output port;

[0035] 5. second through pipe; 51. second body; 52. second input port; 53. second output port;

[0036] 6. resistance control module; 61. insulating porcelain cylinder; 62. fixing platform; 63. sliding member; 631. toggle part; 64. resistance wire; 65. cover body;

[0037] 7. Insulation layer. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] The working principle of the induction heating device provided in this embodiment is: using the principle of electromagnetic induction, the part to be processed cuts the magnetic lines of force in the alternating magnetic field, generates an induced current on the surface of the part to be processed, and based on the skin effect of the alternating current, the surface of the part is quickly heated in the form of eddy current, and then rapidly cooled to achieve quenching processing.

[0046] The following combination Figures 1 to 5The specific contents of this embodiment are described in detail. This embodiment provides an induction heating device, which is used to heat a workpiece to be processed. When the induction heating device provided by this embodiment is in a working state of heating the workpiece to be processed, the internal channel of the induction heating device is cooled by cooling water.

[0047] like Figure 1-Figure 4 As shown, the induction heating device includes: at least two hollow heating elements, a resistance control module 6, a first through-tube 4 and a second through-tube 5. At least two hollow heating elements are arranged on one side of the workpiece to be processed, and two adjacent heating elements are arranged at intervals along the axis direction of the workpiece to be processed, and each heating element is provided with an input channel and an output channel. Figure 3-Figure 4 As shown, the first through-tube 4 includes a first body 41, a first input port 42 and at least two first output ports 43. The first body 41 is hollow inside, the first input port 42 is located on one side of the first body 41, and at least two first output ports 43 are arranged at intervals on the other side of the first body 41 in the vertical direction. The input channels of at least two sections of the heating element are connected to the at least two first output ports 43 one by one. The second through-tube 5 includes a second body 51, at least two second input ports 52 and a second output port 53. The second body 51 is hollow inside, and the output channels of at least two sections of the heating element are connected to the at least two second input ports 52 one by one. In this embodiment, the first input port 42 and the first output port 43 are located on opposite sides of the first body 41, which is convenient for operators to distinguish and optimize the overall structure and reduce the occupied space. The input channel of each section of the heating element is connected to the first through-tube 4, and the output channel of each section of the heating element is connected to the second through-tube 5, so that all input channels and all output channels are connected to the first through-tube 4 and the second through-tube 5, respectively. The first through-tube 4 and the second through-tube 5 are used to connect to the power supply to realize the parallel connection of each section of the heating element. At the same time, the first through-tube 4 and the second through-tube 5 are also used to connect to the cooling water. The cooling water flows from the first through-tube 4 into the interior of the heating element, and then flows out from the second through-tube 5 to realize the cooling of the induction heating device. The resistance control module 6 is used to adjust the resistance value connected to each section of the heating element. Under the condition that the voltage connected to each section of the heating element is the same, the resistance value connected to each section of the heating element is adjusted to realize the adjustment of the current connected to each section of the heating element. The specific principle of this embodiment is: the current intensity of each section of the heating element is adjusted by adjusting the resistance. The current intensity affects the magnetic field intensity. The magnetic field intensity affects the current size on the surface of the part, thereby affecting the heat transfer. In this embodiment, the heating element of the induction heating device adopts a copper tube with a square channel inside. When the workpiece is heated by the induction heating device, it needs to be in a rotating state at all times.

[0048] In short, the induction heating device provided by the present invention arranges at least two sections of hollow heating elements at intervals along the axial direction of the axis to be processed, the input channel of each section of the heating element is connected to the corresponding first output port 43 on the first through tube 4, and the output channel of each section of the heating element is connected to the corresponding second input port 52 on the second through tube 5, so that each section of the heating element is connected in parallel with each other, and a resistance control module 6 is set between the corresponding first output port 43 and the corresponding output channel of each section of the heating element to achieve the function of adjusting the resistance value of each section of the heating element. The resistance value of the resistance control module 6 can be adjusted according to different hardening layer or surface hardness requirements on the workpiece to be processed, so as to realize the regulation of the input power of at least two sections of the heating elements, that is, the heating power of the workpiece to be processed is regulated in sections, the processing technology is improved, and it is beneficial to improve the qualified rate of the product.

[0049] Furthermore, if Figure 2 As shown, the resistance control module 6 includes an insulating porcelain cylinder 61, one end of which is fixed and connected to the input channel of the corresponding heating element, and the other end of the insulating porcelain cylinder 61 is fixed and connected to the first output port 43 of the first through tube 4. The interconnected manner is adopted to achieve smooth circulation of the cooling liquid, reduce the temperature of the induction heating device itself, and extend the service life. Further optionally, the resistance control module 6 also includes a fixed platform 62, a sliding member 63 and a resistance wire 64. The resistance wire 64 is wound around the outer wall surface of the insulating porcelain tube 61, and the two ends of the resistance wire 64 are respectively electrically connected to the input channel of the corresponding heating element and the first through tube 4. One end of the fixed platform 62 is sleeved on the outer wall surface of the input channel of the corresponding heating element, so that the fixed platform 62 can be stably set on the heating element. The other end of the fixed platform 62 is slidably provided with a sliding member 63, one end of the sliding member 63 is in contact with the resistance wire 64, and the ends of the sliding member 63 and the resistance wire 64 are in contact with two clamps, and the two clamps are respectively tightly fitted with the resistance wire 64 to ensure the stability of the connection between the sliding member 63 and the resistance wire 64; on the other hand, when one clamp is not in contact with the resistance wire 64, the other clamp can also ensure the normal access of the circuit, thereby improving the redundancy of the design of the induction heating device and reducing the failure rate. By adjusting the contact position between the sliding member 63 and the resistance wire 64 and changing the length of the connected resistance wire 64, the resistance value can be changed. The input power of each heating element can be adjusted according to the different hardening layers or surface hardness requirements on the parts to be processed, thereby improving the heating effect of the parts to be processed and increasing the qualified rate of the products.

[0050] Furthermore, the other end of the sliding member 63 away from the resistance wire 64 is provided with a toggle portion 631, which is made of an insulating material. By providing the toggle portion 631 made of an insulating material, on the one hand, it is convenient for the operator to manually adjust the resistance control module 6; on the other hand, the toggle portion 631 is non-conductive, so that the operator can adjust the resistance control module 6 even when the power is not turned off, thereby protecting the safety of the operator.

[0051] Furthermore, if Figure 1-Figure 2 As shown, the resistance control module 6 also includes a cover 65, and the fixed platform 62, the sliding member 63 and the resistance wire 64 can all be located in the cover 65. The cover 65 opens downward and can be movably clamped on the outer wall surface of the fixed platform 62. When the workpiece to be processed completes the heating stage and enters the quenching stage, the cooling medium rapidly cools the workpiece to be processed in a red-hot state, so as to avoid the cooling medium from splashing onto the components inside the resistance control module 6, thereby extending the service life of the resistance control module 6. Specifically, the cover 65 is made of stainless steel or plastic.

[0052] Furthermore, an insulating layer 7 is provided between two adjacent heating elements, and the two opposite sides of the insulating layer 7 are respectively in contact with the corresponding two heating elements. Each heating element is connected in parallel, and by adding the insulating layer 7, the current isolation between adjacent heating elements is further achieved, which further ensures the normal use of the induction heating device and reduces the failure rate.

[0053] Furthermore, the first output port 43 and the two ends of the insulating porcelain tube 61 are sealed and plugged with the corresponding first output port 43 and the corresponding input channel of the heating element. The shapes of the sealed plug-in parts at the two ends of the insulating porcelain tube 61 are respectively adapted to the shapes of the first output port 43 and the input channel of the heating element, which facilitates the assembly, maintenance and replacement of the induction heating device. Specifically, a sealing ring is provided at the sealed plug-in part to further improve the sealing effect.

[0054] Furthermore, the induction heating device includes three sections of heating elements, which are respectively: a first section heating element 1, a second section heating element 2 and a third section heating element 3, the output channels of the first section heating element 1, the second section heating element 2 and the third section heating element 3 are all connected to the corresponding second input port 52, and the second output port 53 is located below the output channel of the third section heating element 3. The second output port 53 is arranged below the output channel of the third section heating element 3, so as to facilitate the rapid outflow of cooling water inside the heating element, quickly reduce the temperature of the heating element, avoid oxidation of the heating element due to high temperature, and extend the service life of the heating element.

[0055] Furthermore, if Figure 1 Combination Figure 5As shown, the first segmented heating element 1 includes a first segmented input channel 11, a first segmented heating body 12 and a first segmented output channel 13. The first segmented input channel 11 and the first segmented output channel 13 are respectively perpendicular to the two ends of the first segmented heating body 12, and the extension direction of the first segmented input channel 11 is spatially perpendicular to the extension direction of the first segmented output channel 13. By adopting the mode that the extension direction of the first segmented input channel 11 is spatially perpendicular to the extension direction of the first segmented output channel 13, the heating element can be used even after the positions of the input channel and the output channel are swapped, thereby improving the applicability of the heating element. In other implementations, the first segmented input channel 11 and the first segmented output channel 13 can be sealed and plugged with the first segmented heating body 12, which is convenient for the splicing and use of the induction heating device; when the channel is blocked, it is also convenient to replace the input channel, the output channel and the heating element, avoiding the discarding of the entire induction heating device, thereby reducing the production cost. Preferably, the structure of the second segmented heating element 2 and the third segmented heating element 3 in this embodiment is the same as that of the first segmented heating element 1, and this embodiment will not be described in detail.

[0056] This embodiment also provides a heat treatment device, including an AC power supply and an induction heating device as described above, wherein the AC power supply is electrically connected to the first through-tube 4 and the second through-tube 5, respectively. Further, the heat treatment device also includes a cooling circulation device, wherein the output end of the cooling circulation device is connected to the first through-tube 4, and the return end of the cooling circulation device is connected to the second through-tube 5, so as to reduce the heat conduction effect of the heating element itself on the external environment. Further optionally, the heat treatment device also includes a rapid spraying device, and after the heating of the workpiece is completed, the rapid spraying device is aimed at the workpiece in a red-hot state to quickly spray a large amount of cooling medium to complete the last stage of the quenching treatment of the workpiece.

[0057] Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An induction heating device for heating a workpiece, characterized in that: include: At least two hollow heating elements are disposed on one side of the workpiece to be processed, and the at least two heating elements are sequentially spaced apart along the axis direction of the workpiece to be processed, and each heating element is provided with an input channel and an output channel; A first through pipe (4), comprising a first body (41), a first input port (42) and at least two first output ports (43), wherein the first input port (42) is located on one side of the first body (41), and at least two first output ports (43) are arranged at intervals along a vertical direction on the other side of the first body (41), and the input channels of at least two sections of the heating element are connected to the at least two first output ports (43) in a one-to-one correspondence; A second through pipe (5) comprising a second body (51), a second output port (53) and at least two second input ports (52), wherein the output channels of at least two sections of the heating element are connected to the at least two second input ports (52) in a one-to-one correspondence; a resistance control module (6), arranged between each of the first output ports (43) and an input channel of the corresponding heating element, the resistance control module (6) being used to adjust the resistance value of each section of the heating element connected thereto, so as to achieve control of the input power of at least two sections of the heating element; The induction heating device comprises three sections of heating elements, namely: A first segmented heating element (1), a second segmented heating element (2), and a third segmented heating element (3) are arranged in sequence from top to bottom, and the second output port (53) is located below the output channel of the third segmented heating element (3); The first segmented heating element (1) comprises a first segmented input channel (11), a first segmented heating body (12) and a first segmented output channel (13) which are connected in sequence, the first segmented input channel (11) and the first segmented output channel (13) being respectively perpendicular to two ends of the first segmented heating body (12), and an extension direction of the first segmented input channel (11) is spatially perpendicular to an extension direction of the first segmented output channel (13); The resistance control module (6) comprises an insulating porcelain cylinder (61), a fixing platform (62), a sliding member (63) and a resistance wire (64); one end of the insulating porcelain cylinder (61) is connected to the input channel corresponding to the heating element, and the other end is connected to the first output port (43) of the first through tube (4); the resistance wire (64) is wound around the outer wall surface of the insulating porcelain cylinder (61), and the two ends of the resistance wire (64) are respectively electrically connected to the input channel of the corresponding heating element and the first through tube (4); one end of the fixing platform (62) is sleeved on the outer wall surface of the input channel corresponding to the heating element, and the other end is slidably provided with the sliding member (63); one end of the sliding member (63) is in contact with the resistance wire (64).

2. The induction heating device according to claim 1, characterized in that: The other end of the sliding member (63) away from the resistance wire (64) is provided with a toggle portion (631), and the toggle portion (631) is made of an insulating material.

3. The induction heating device according to claim 2, characterized in that: The resistance control module (6) further comprises a cover body (65), wherein the cover body (65) has an opening facing downward and can be movably clamped on the outer wall surface of the fixing platform (62).

4. The induction heating device according to claim 3, characterized in that: An insulating layer (7) is provided between two adjacent sections of the heating element, and two opposite side surfaces of the insulating layer (7) are respectively in contact with the corresponding two sections of the heating element.

5. The induction heating device according to claim 4, characterized in that: Both ends of the insulating porcelain cylinder (61) are respectively sealed and plugged with the corresponding first output port (43) and the corresponding input channel of the heating element.

6. A heat treatment device, characterized in that: It comprises an AC power source and the induction heating device according to any one of claims 1 to 5, wherein the AC power source is electrically connected to the first through-tube (4) and the second through-tube (5) respectively.

7. The heat treatment equipment according to claim 6, characterized in that The heat treatment equipment further comprises a cooling circulation device, wherein the output end of the cooling circulation device is connected to the first through pipe (4), and the return end of the cooling circulation device is connected to the second through pipe (5).

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