Intermediate-frequency heating and heat preservation device for chain heat treatment

Abstract

The utility model relates to a chain heat treatment intermediate frequency heating insulation device which comprises at least two separable furnace body modules, a double-layer spiral coil structure is arranged in each furnace body module and comprises a fixed coil on the outer layer and a floating coil on the inner layer, and the fixed coil and the floating coil at least partially coincide in the axial direction to form a magnetic field superposition area. The floating coil is driven by an external force to move axially so as to adjust the area of the magnetic field superposition area. According to the chain heat treatment medium-frequency heating and heat preservation device, the plurality of separable furnace body modules form the chain heat treatment medium-frequency heating and heat preservation device, the furnace body modules can be independently detached and can be independently detached and replaced when being locally damaged, overall shutdown for maintenance is not needed, the maintenance efficiency is improved, and the operation and maintenance cost is greatly reduced; and through the arrangement of the double-layer spiral coil structure in the furnace body module, the area of a magnetic field superposition area can be adjusted by driving the floating coil on the inner layer to move axially, eddy current distribution is optimized, and the problems of edge cold areas and center overheating are solved.

Description

Technical Field

[0001] This utility model belongs to the field of chain processing technology, and specifically relates to a medium-frequency heating and heat preservation device for chain heat treatment. Background Technology

[0002] In the chain manufacturing industry, heat treatment is a key process for improving the mechanical properties of chains. Among these processes, medium-frequency induction heating technology is widely used due to its advantages such as high heating efficiency, low energy consumption, and precise temperature control. Traditional medium-frequency heating devices for chain heat treatment typically employ an integrated furnace structure with a single-layer spiral layout of internal electromagnetic coils. This allows for localized or overall heating of the chain through the principle of electromagnetic induction.

[0003] However, the integrated design of the furnace body and the fixed coil means that when the coil is partially damaged or aged, the entire furnace body must be disassembled for repair, resulting in long downtime, high maintenance costs, and serious impact on production efficiency. Moreover, the single fixed-size coil is difficult to adapt to the processing requirements of chains of different specifications. For example, small-diameter chains may overheat due to excessive electromagnetic coupling, while large-diameter chains may not be heated enough, requiring frequent replacement of heating devices or adjustment of process parameters, reducing the flexibility of the production line. Utility Model Content

[0004] This utility model addresses the problems of existing technologies by providing a medium-frequency heating and heat preservation device for chain heat treatment. The specific technical solution is as follows:

[0005] A chain heat treatment medium-frequency heating and heat preservation device includes at least two separable furnace body modules. Each furnace body module is equipped with a double-layer spiral coil structure, including an outer fixed coil and an inner floating coil. The fixed coil and the floating coil at least partially overlap in the axial direction to form a magnetic field superposition area. The floating coil can move axially under the drive of an external force to adjust the area of ​​the magnetic field superposition area.

[0006] As a further technical solution of this utility model, one end of the floating coil is connected to the fixed contact through a braided copper strip, and the other end of the floating coil is slidably mounted on the track contact through a sliding brush.

[0007] As a further technical solution of this utility model, two adjacent furnace body modules are connected by a fixing structure. The fixing structure includes two mounting plates, a gasket, a bolt, and a nut. The two mounting plates are distributed on the two adjacent furnace body modules, the gasket is spaced between the two mounting plates, and the bolt passes through the two mounting plates and the gasket and is screwed onto the nut.

[0008] As a further technical scheme of the utility model, the step sealing structure is arranged on the pressing surface of the two adjacent furnace body modules, the step sealing structure comprises a ring groove, a sealing ring and a compensating expansion gasket, the ring groove and the sealing ring are all arranged with multiple groups and are alternately arranged along the thickness direction of the furnace body module, and the ring groove and the sealing ring on the abutting surface of the two adjacent furnace body modules are cross-coupled to form a labyrinth air gap.

[0009] As a further technical scheme of the utility model, the compensating expansion gasket is arranged in the ring groove, and the compensating expansion gasket is formed by superimposing multiple layers of graphene-ceramic composite materials.

[0010] As a further technical scheme of the utility model, the cross section of the sealing ring is in a trapezoidal structure.

[0011] The utility model has the advantages as follows:

[0012] (1) in the application, the chain heat treatment medium frequency heating holding device is formed by multiple separable furnace body modules, each furnace body module can be individually disassembled, and when partial damage occurs, the furnace body module can be individually disassembled and replaced, so that overall shutdown maintenance is not needed, maintenance efficiency is improved, and operation and maintenance cost is greatly reduced; and through the arrangement of the double-layer spiral coil structure in the furnace body module, the area of the magnetic field superposition region can be adjusted by driving the axial movement of the floating coil of the inner layer, the eddy current distribution is optimized, and the edge cold area and center overheating problems are eliminated.

[0013] (2) in the application, through the arrangement of the step sealing structure, the path length of heat transfer is greatly increased through multiple continuous bending or step-shaped gaps, and the heat conduction efficiency is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The overall structure schematic diagram of the chain heat treatment medium frequency heating holding device is shown.

[0015] Figure 2 The structure schematic diagram of the furnace body module is shown.

[0016] Figure 3 The structure schematic diagram of the furnace body module is shown. Figure 1 The enlarged view of the position A in the figure.

[0017] LEGEND:

[0018] 100, furnace body module; 110, fixed coil; 120, floating coil; 121, braided copper strip; 122, fixed contact; 123, sliding brush; 124, track contact; 130, fixed structure; 131, mounting sheet; 132, gasket; 133, bolt; 134, nut; 140, step sealing structure; 141, ring groove; 142, sealing ring; 143, compensating expansion gasket. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the utility model technical scheme will be clearly and completely described below in combination with embodiments.

[0020] Figure 1 The overall structure schematic diagram of the chain heat treatment intermediate frequency heating holding device is shown; Figure 1 In this chain heat treatment intermediate frequency heating holding device, at least two separable furnace body modules 100 are included; in this way, each furnace body module 100 can be individually disassembled, and when partial damage occurs, it can be individually disassembled and replaced, without the need for overall shutdown maintenance, the maintenance efficiency is improved, and the operation and maintenance cost is greatly reduced.

[0021] Figure 2 The structural schematic diagram of the furnace body module 100 is shown; Figure 2 In the furnace body module 100, a double-layer spiral coil structure is arranged, including a fixed coil 110 at the outer layer and a floating coil 120 at the inner layer, the fixed coil 110 and the floating coil 120 at least partially overlap in the axial direction to form a magnetic field superposition area, and the floating coil 120 is driven by an external force to move axially to adjust the area of the magnetic field superposition area; the fixed coil 110 at the outer layer and the floating coil 120 at the inner layer are coaxially arranged, the radial spacing between them is fixedly different, and the floating coil 120 at the inner layer can be driven to move axially, so as to adjust the area of the magnetic field superposition area of the fixed coil 110 and the floating coil 120, the magnetic field coverage is more matched with the geometric shape of the workpiece, and the edge cold zone and the center overheating problem are eliminated.

[0022] The specific principle is: based on Faraday's law of electromagnetic induction, when an alternating current passes through a coil, a changing magnetic field is generated, and then eddy current is induced in the workpiece to achieve heating; the adjustable design adjusts the axial spacing of the inner and outer coils to adjust the magnetic field superposition area, thereby optimizing the eddy current distribution.

[0023] It should be noted that the specific driving structure is not limited and protected by the present application, and can be a motor cooperating with a lead screw or a hydraulic drive.

[0024] Referring to Figure 2 , one end of the floating coil 120 is connected to the fixed contact 122 through the braided copper band 121, and the other end of the floating coil 120 is slidingly installed on the track contact 124 through the sliding brush 123; when the floating coil 120 is driven to move axially, the braided copper band 121 can be stretched to provide a displacement amount for the movement of the floating coil 120, the track contact 124 is pre-installed in the furnace body module 100, and the sliding brush 123 is in sliding contact with the track contact 124 and ensures the stability of the power supply, thereby realizing the stable sliding of the floating coil 120 in the axial direction.

[0025] Figure 3An enlarged view of area A is shown Figure 1 An enlarged view of area A is shown Figure 3 In the embodiment, two adjacent furnace body modules 100 are connected through a fixing structure 130, the fixing structure 130 comprises two mounting plates 131, a gasket 132, a bolt 133 and a nut 134, the two mounting plates 131 are distributed on the two adjacent furnace body modules 100, the gasket 132 is arranged between the two mounting plates 131, the bolt 133 penetrates through the two mounting plates 131 and the gasket 132 and is screwed with the nut 134; by arranging the gasket 132 between the two mounting plates 131, on the one hand, the sealing effect of the gap between the two mounting plates 131 is improved, on the other hand, the distance between the two mounting plates 131 is further shortened, and space is reserved for thermal expansion.

[0026] Continuing to refer to Figure 3 The abutting faces of the two adjacent furnace body modules 100 are provided with a stepped sealing structure 140, the stepped sealing structure 140 comprises a ring groove 141 and a sealing ring 142, and a compensation expansion gasket 143, the ring groove 141 and the sealing ring 142 are both provided with multiple groups and are alternately arranged along the thickness direction of the furnace body module 100, and the ring groove 141 and the sealing ring 142 on the abutting faces of the two adjacent furnace body modules 100 are cross-coupled to form a labyrinth air gap; that is to say, the ring groove 141 and the sealing ring 142 are alternately arranged on the abutting end faces of each furnace body module 100, but the ring groove 141 and the sealing ring 142 on the abutting faces of the two adjacent furnace body modules 100 are arranged in a staggered manner, the ring groove 141 on one furnace body module 100 corresponds to the sealing ring 142 on the other furnace body module 100, so that the labyrinth air gap can be formed, the heat loss path is prolonged, and the radiation heat transfer efficiency is reduced; the compensation expansion gasket 143 is arranged in the ring groove 141, and the compensation expansion gasket 143 is composed of multiple layers of graphene-ceramic composite material; the compensation expansion gasket 143 is pre-compressed by 20% at normal temperature, and when the furnace temperature rises to 800 DEG C, the compensation expansion gasket 143 is filled with the gap and compensates the thermal deformation of the module metal shell; the sealing ring 142 is in a trapezoidal structure in cross section; and the sealing ring 142 is beneficial to the guidance when the two furnace body modules 100 are abutted.

[0027] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same.

Claims

1. A medium-frequency heating and heat preservation device for chain heat treatment, characterized in that: The application relates to a furnace body module (100) comprising a double-layer spiral coil structure, which comprises an outer fixed coil (110) and an inner floating coil (120), the fixed coil (110) and the floating coil (120) at least partially overlap in the axial direction to form a magnetic field superposition area, and the floating coil (120) is driven by an external force to move axially to adjust the area of the magnetic field superposition area.

2. The chain heat treatment medium frequency heating holding device according to claim 1, characterized in that: One end of the floating coil (120) is connected with a fixed contact (122) through a braided copper band (121), and the other end of the floating coil (120) is slidably installed on a track contact (124) through a sliding brush (123).

3. The chain heat treatment medium frequency heating holding device according to claim 2, characterized in that: Two adjacent furnace body modules (100) are connected through a fixed structure (130), the fixed structure (130) comprises two mounting sheets (131), a gasket (132), a bolt (133) and a nut (134), the two mounting sheets (131) are arranged on the two adjacent furnace body modules (100), the gasket (132) is arranged between the two mounting sheets (131), the bolt (133) penetrates through the two mounting sheets (131) and the gasket (132) and is screwed with the nut (134).

4. The chain heat treatment medium frequency heating holding device according to claim 3, characterized in that: A stepped sealing structure (140) is arranged on the pressing joint surface of the two adjacent furnace body modules (100), the stepped sealing structure (140) comprises a ring groove (141), a sealing ring (142) and a compensating expansion gasket (143), the ring groove (141) and the sealing ring (142) are arranged in multiple groups and are alternately arranged along the thickness direction of the furnace body module (100), and the ring groove (141) and the sealing ring (142) on the joint surface of the two adjacent furnace body modules (100) are cross-coupled to form a labyrinth air gap.

5. The chain heat treatment medium frequency heating holding device according to claim 4, characterized in that: The compensating expansion gasket (143) is arranged in the ring groove (141) and is formed by stacking multiple layers of graphene-ceramic composite materials.

6. The chain heat treatment medium frequency heating holding device according to claim 5, characterized in that: The sealing ring (142) has a trapezoidal structure in the cross section.

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