A debonding device for producing ferrite cores

Abstract

The utility model discloses a debinding device for ferrite core production, which belongs to the technical field of ferrite core production. The utility model includes a furnace body and a heating source arranged in the furnace body, wherein an air inlet and an air outlet are provided on the furnace body, and the air inlet and the air outlet are connected by a circulation pipeline, and a circulation fan is provided on the circulation pipeline; the circulation pipeline includes an air outlet pipe assembly, an air inlet pipe assembly and an exhaust gas treatment assembly; wherein the exhaust gas treatment assembly includes a first heat exchanger, and the exhaust gas generated in the furnace body enters the exhaust gas treatment assembly through the air outlet pipe assembly, and after condensation and debinding in the first heat exchanger, enters the furnace body through the air inlet pipe assembly for internal circulation. The utility model adopts circulating exhaust gas as replacement gas for internal circulation, which can effectively reduce the oxygen content in the furnace body to suppress the combustion of adhesive, thereby effectively avoiding product defects caused by thermal runaway.

Description

Technical Field

[0001] The utility model belongs to the technical field of ferrite core production, and more specifically relates to a debonding device for ferrite core production. Background Art

[0002] A magnetic core is a sintered magnetic metal oxide composed of a mixture of various iron oxides. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical core materials. Manganese-zinc ferrite has the characteristics of high magnetic permeability and high magnetic flux density, and has low loss characteristics at frequencies below 1MHz. Ferrite cores are used in coils and transformers in various electronic devices.

[0003] In the process of producing soft ferrite cores, in order to facilitate the production of core blanks of various shapes, a certain amount of organic adhesive needs to be added during the preparation of granular materials. During the sintering process of the core, the adhesive needs to be heated and volatilized first. For example, in the patent CN115060079A, an intelligent debinding system for ferrite cores is disclosed. The application includes a heating furnace, a cooling furnace, a track, and a control device. A transport vehicle is arranged on the track. The heating furnace and the cooling furnace are arranged on the track. The debinding condenser, the drainage condenser, the air mixer, the dryer, the cooling furnace, the first-level heater, the second-level heater, and the third-level heater are connected in series from the air outlet to the air inlet of the heating furnace. The transport vehicle runs on the track and passes through the heating furnace and the cooling furnace in turn, which is convenient for transportation and saves manpower; the gas discharged from the heating furnace is recycled to avoid environmental pollution, and the heat in the gas after passing through the cooling furnace is fully utilized to avoid energy waste; the colloid and water of the parts are evaporated at one time, and are cooled and recycled separately, which improves the processing quality of the parts.

[0004] For another example, in patent CN116072408A, a debinding furnace and debinding method for ferrite core production are disclosed. The application sets a limit rail to enable the support plate to move smoothly, so that the position of the support plate and the drive motor can be changed to ensure the stable operation of the device. The drive motor is set to drive the shaft to rotate, and the shaft drives the sliding block and the limit rail to rotate, thereby driving the support plate and the ferrite core body above it to rotate, so that the ferrite core body can be evenly and comprehensively contacted with the high-temperature airflow, heated evenly, and the adhesive can be fully decomposed.

[0005] However, during the entire debinding process, the volatilization of the adhesive starts at 160 degrees, and there is an obvious weight loss range from 190 degrees to 350 degrees, and the fastest volatilization point is at 280 degrees. The inventors learned from the thermal curve analysis of debinding that 180 degrees to 190 degrees is a very dangerous spontaneous heat release point, at which the adhesive will undergo a spontaneous exothermic reaction, causing the temperature in the furnace to lose control. The uncontrolled temperature accelerates the discharge of the adhesive, and finally causes the volatilization of the adhesive to be out of control, resulting in the cracking of the magnetic core blanks, especially the larger magnetic core blanks, due to the rapid increase in temperature, resulting in a decrease in product yield. Utility Model Content

[0006] 1. Problems to be solved

[0007] In view of the problem that the adhesive is easy to burn in the existing debinding furnace during the debinding process, which leads to the temperature in the furnace being out of control and affects the product quality, the utility model provides a debinding device for ferrite core production. The debinding device of the utility model adopts the circulating exhaust gas as the replacement gas for internal circulation, which can effectively reduce the oxygen content in the furnace to inhibit the burning of the adhesive, thereby effectively avoiding product defects caused by thermal runaway.

[0008] 2. Technical solution

[0009] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0010] The utility model discloses a debinding device for producing ferrite cores, comprising a furnace body and a heating source arranged in the furnace body, wherein an air inlet and an air outlet are provided on the furnace body, the air inlet and the air outlet are connected through a circulation pipeline, and a circulation fan is provided on the circulation pipeline;

[0011] The circulation pipeline includes an outlet pipe assembly, an inlet pipe assembly and an exhaust gas treatment assembly; wherein, the exhaust gas treatment assembly includes a first heat exchanger, and the exhaust gas generated in the furnace body enters the exhaust gas treatment assembly through the outlet pipe assembly, and after condensation and degumming in the first heat exchanger, enters the furnace body through the inlet pipe assembly for internal circulation.

[0012] Furthermore, a combustion chamber is provided between the exhaust pipe assembly and the exhaust gas channel of the first heat exchanger, and an igniter is provided in the combustion chamber for burning the exhaust gas to consume oxygen.

[0013] Furthermore, a second heat exchanger is provided between the combustion chamber and the first heat exchanger, and the second heat exchanger is used to perform heat exchange and cooling on the exhaust gas before condensation.

[0014] Furthermore, the air intake pipe assembly includes a first air intake duct and a second air intake duct; wherein, one end of the first air intake duct is connected to the air inlet on the furnace body, and the other end is connected to the exchange source channel outlet of the second heat exchanger; one end of the second air intake duct is connected to the exhaust gas channel outlet of the first heat exchanger, and the other end is connected to the exchange source channel inlet of the second heat exchanger.

[0015] Furthermore, the circulation fan is arranged on the second air inlet duct.

[0016] Furthermore, the air intake pipe assembly also includes an air intake frame, which is connected to the first air intake pipe through the air intake holes thereon, and the air intake frame is provided with a plurality of air outlet holes, which are connected to the air intake port on the furnace body through the second branch pipe.

[0017] Furthermore, the air outlet pipe assembly comprises a main air outlet pipe, one end of which is connected to the combustion chamber, and the other end of which is connected to the air outlet on the furnace body through a plurality of first branch pipes.

[0018] Furthermore, one end of the main air outlet pipe close to the combustion chamber is connected to a pressure relief pipe through a pressure relief valve.

[0019] Furthermore, the heating source is a carbon rod, and the carbon rod is arranged in multiple groups along the length direction of the furnace body, and a placement space for the ferrite core stack to enter is formed between adjacent carbon rod groups.

[0020] Furthermore, a bearing plate is provided at the bottom of the furnace body, and the bearing plate is connected to a lifting mechanism for driving the bearing plate to move up and down.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] (1) The utility model discloses a debinding device for producing ferrite cores, wherein one end of a circulation pipeline is connected to an air inlet on a furnace body, and the other end is connected to an air outlet on the furnace body, so that the exhaust gas generated in the furnace body is internally circulated, and the adhesive in the exhaust gas is condensed and removed by cooling the exhaust gas. Compared with the traditional debinding device, the debinding device of the utility model does not need to add new replacement air, and can effectively reduce the oxygen content in the furnace body to inhibit the combustion of the adhesive, thereby facilitating the temperature control in the furnace body and effectively avoiding product defects caused by thermal runaway.

[0024] (2) The utility model provides a debonding device for ferrite core production, which is used to burn waste gas through the setting of a combustion chamber to consume the oxygen content in the waste gas, thereby further suppressing the spontaneous combustion and heat release of the adhesive; at the same time, the setting of a pressure relief valve is conducive to ensuring the safety of the combustion process.

[0025] (3) The utility model provides a debinding device for producing ferrite cores. By setting up a second heat exchanger, the waste gas before and after condensation is heat exchanged, which is beneficial to improving the utilization rate of thermal energy.

[0026] (4) The utility model provides a debinding device for producing ferrite cores. A placement space for ferrite core stacks is formed between adjacent carbon rod groups, so that the ferrite cores are heated more evenly and the product can be effectively prevented from cracking due to excessive local temperature differences in the ferrite cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a debonding device for producing ferrite cores according to the utility model;

[0028] Figure 2 It is a top view of a debonding device for producing ferrite cores according to the utility model;

[0029] Figure 3 This is a rear view of a debonding device for producing ferrite cores according to the utility model;

[0030] Figure 4 for Figure 2 Sectional view along AA direction;

[0031] Figure 5 It is a structural schematic diagram of the circulation pipeline in the utility model.

[0032] In the figure: 1. furnace body; 2. heating source; 3. circulating fan;

[0033] 4. Air outlet pipe assembly; 41. Main air outlet pipe; 42. First branch pipe; 43. Pressure relief valve; 44. Pressure relief pipe;

[0034] 5. Intake pipe assembly; 51. First intake pipe; 52. Second intake pipe; 53. Intake frame; 531. Air outlet; 54. Second branch pipe;

[0035] 6. Exhaust gas treatment component; 61. First heat exchanger; 62. Combustion chamber; 63. Second heat exchanger;

[0036] 7. Ferrite core stack; 8. Carrying plate. DETAILED DESCRIPTION

[0037] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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, rather than indicating or implying 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", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] The utility model is further described below in conjunction with specific embodiments.

[0040] refer to Figure 1 , Figure 2 , Figure 4 As shown, a debinding device for producing ferrite cores in this embodiment includes a furnace body 1 and a heating chamber arranged in the furnace body 1, and a heating source 2 is provided in the heating chamber.

[0041] A carrying plate 8 is provided at the bottom of the furnace body 1 for carrying the ferrite core stack 7. The carrying plate 8 is connected to a lifting mechanism for driving the carrying plate 8 to move up and down, so that the ferrite core stack 7 on the carrying plate 8 enters the heating chamber from the through hole below the furnace body 1.

[0042] The heating source 2 is used to heat the heating chamber to increase the temperature so that the adhesive can evaporate from the magnetic core.

[0043] At the same time, an air inlet and an air outlet that penetrate the heating chamber are provided on the furnace body 1. In order to discharge the volatilized adhesive in the heating chamber smoothly from the air outlet, it is generally necessary to pass replacement gas into the heating chamber through the air inlet. The usual practice is to directly use air as replacement gas, which is economical on the one hand, and on the other hand, when the temperature in the heating chamber rises to a certain value, the oxygen content in the air can be used to promote the combustion of the adhesive, and the adhesive will release heat during the combustion process, which can increase the temperature in the heating chamber, further accelerate the discharge rate of the adhesive, and reduce the time of the entire adhesive removal process.

[0044] However, the inventors have found that the self-ignition heat release of the adhesive often occurs on the surface of the magnetic core. When the magnetic core is large, the center of the magnetic core is far away from the surface of the magnetic core, which will cause a large difference between the temperature of the surface of the magnetic core and the temperature at the center, making it easy for the magnetic core to crack.

[0045] To this end, in this embodiment, the air inlet and the air outlet are connected by a circulation pipeline, and a circulation fan 3 is provided on the circulation pipeline. The waste gas generated in the heating chamber is debonded in the circulation pipeline and then re-enters the heating chamber for internal circulation, which can effectively reduce the spontaneous combustion and heat release of the adhesive.

[0046] Specifically, the circulation pipeline includes an outlet pipe assembly 4, an inlet pipe assembly 5, and an exhaust gas treatment assembly 6 disposed therebetween. The exhaust gas treatment assembly 6 includes a first heat exchanger 61. The exhaust gas generated in the furnace body 1 enters the exhaust gas treatment assembly 6 through the outlet pipe assembly 4, is condensed and debonded in the first heat exchanger 61, and then enters the furnace body 1 through the inlet pipe assembly 5 for internal circulation.

[0047] refer to Figure 5 As shown, a combustion chamber 62 is provided between the exhaust pipe assembly 4 and the exhaust gas passage of the first heat exchanger 61. The combustion chamber 62 is equipped with an igniter for burning the exhaust gas to further consume the oxygen content in the exhaust gas.

[0048] At the same time, in order to further improve the utilization rate of the heat energy in the entire device, a second heat exchanger 63 is provided between the combustion chamber 62 and the first heat exchanger 61. The waste gas after condensation and debonding enters the exchange source channel of the second heat exchanger 63 and exchanges heat with the waste gas before condensation in the waste gas channel of the second heat exchanger 63, and then enters the heating chamber for replacement.

[0049] It should be noted that the first heat exchanger 61 and the second heat exchanger 63 in this embodiment can be directly purchased, and their structures and working principles are all existing technologies.

[0050] In this embodiment, as an implementation method of the heating source 2, refer to Figure 4 As shown, the heating source 2 is preferably a carbon rod. The carbon rods are arranged in multiple groups along the length direction of the furnace body 1, and each group includes multiple carbon rods arranged up and down. A placement space for the ferrite core stack 7 to enter is formed between adjacent carbon rod groups to ensure uniform heating of the core.

[0051] refer to Figure 3 , Figure 5 As shown, as a specific implementation of the air outlet pipe assembly 4, the air outlet pipe assembly 4 includes a main air outlet pipe 41, one end of which is connected to the combustion chamber 62, and the other end is connected to the air inlet on the furnace body 1.

[0052] Preferably, one end of the main gas outlet pipe 41 away from the combustion chamber 62 is connected to the gas collecting box on the top of the furnace body 1 through a plurality of first branch pipes 42. The gas collecting box is covered on the gas outlet on the top of the furnace body 1, and the gas outlet can also be provided with multiple.

[0053] In addition, a pressure relief pipe 44 is connected to the end of the main gas outlet pipe 41 near the combustion chamber 62 through a pressure relief valve 43. Specifically, the pressure relief pipe 44 is a cylindrical structure with two ends open. The setting of the pressure relief valve 43 can effectively prevent quality and safety accidents caused by excessive air pressure in the pipeline.

[0054] In this embodiment, as a specific implementation of the intake pipe assembly 5, refer to Figure 3 , Figure 5 As shown, the air intake pipe assembly 5 includes a first air intake pipe 51, a second air intake pipe 52 and an air intake frame 53. One end of the first air intake pipe 51 is connected to the air intake port on the air intake frame 53, and the other end is connected to the exchange source channel outlet of the second heat exchanger 63.

[0055] One end of the second air intake pipe 52 is connected to the exhaust gas channel outlet of the first heat exchanger 61 , and the other end is connected to the exchange source channel inlet of the second heat exchanger 63 .

[0056] Preferably, a collecting pool is provided at the bottom of the first heat exchanger 61 for collecting the condensed adhesive. The air inlet end of the second air inlet duct 52 can be provided on the collecting pool. Meanwhile, the circulating fan 3 is provided on the second air inlet duct 52 near its air inlet end.

[0057] The air inlet frame 53 is a rectangular structure, and a circulating flow cavity is formed inside the air inlet frame 53. The air inlet frame 53 is provided with a plurality of air outlet holes 531, and the air outlet holes 531 are connected to the air inlet of the furnace body 1 through the second branch pipe 54.

[0058] Preferably, the air outlet 531 can be arranged at the top of the opposite side of the air inlet frame 53, and the second branch pipe 54 is also provided with multiple air outlets. Of course, multiple air inlets need to be provided on the furnace body 1 to match it. In other words, multiple air inlet points are actually formed on the furnace body 1 to ensure the uniform entry of the circulating gas, thereby minimizing the situation where the local temperature fluctuation in the heating chamber is too large due to the concentrated entry of the circulating gas. In addition, it should be noted that the circulating gas should avoid direct purge of the magnetic core.

[0059] Specifically in this embodiment, the arrangement of the air inlets on the furnace body 1 is the same as the arrangement direction of the carbon rods. That is, the air inlets are arranged in multiple groups along the length direction of the furnace body 1, and each group includes multiple air inlets arranged up and down, and the single air inlets and single carbon rods in the corresponding group are alternately distributed up and down, that is, the placement space for the ferrite core stack 7 to enter is also formed between adjacent groups of air inlets. This design can further ensure the uniformity of the heating of the circulating gas.

[0060] The debinding device for ferrite core production of the present embodiment adopts circulating gas as replacement gas for internal circulation. Compared with the traditional debinding device, there is no need to add new replacement air, which can effectively reduce the oxygen content in the furnace body 1 to inhibit the combustion of the adhesive, thereby facilitating the temperature control in the furnace body 1 and effectively avoiding product defects caused by thermal runaway.

[0061] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A debinding device for producing ferrite cores, comprising a furnace body (1) and a heating source (2) arranged in the furnace body (1), characterized in that: The furnace body (1) is provided with an air inlet and an air outlet, the air inlet and the air outlet are connected via a circulation pipeline, and a circulation fan (3) is provided on the circulation pipeline; The circulation pipeline comprises an outlet pipe assembly (4), an inlet pipe assembly (5) and an exhaust gas treatment assembly (6); wherein the exhaust gas treatment assembly (6) comprises a first heat exchanger (61); the exhaust gas generated in the furnace body (1) enters the exhaust gas treatment assembly (6) through the outlet pipe assembly (4), is condensed and debonded in the first heat exchanger (61), and then enters the furnace body (1) through the inlet pipe assembly (5) for internal circulation.

2. The debinding device for producing ferrite cores according to claim 1, characterized in that: A combustion chamber (62) is provided between the exhaust pipe assembly (4) and the exhaust gas passage of the first heat exchanger (61), and an igniter is provided in the combustion chamber (62) for burning the exhaust gas to consume oxygen.

3. The debinding device for producing ferrite cores according to claim 2, characterized in that: A second heat exchanger (63) is provided between the combustion chamber (62) and the first heat exchanger (61), and the second heat exchanger (63) is used to perform heat exchange and temperature reduction on the exhaust gas before condensation.

4. The debinding device for producing ferrite cores according to claim 3, characterized in that: The air intake pipe assembly (5) comprises a first air intake pipe (51) and a second air intake pipe (52); wherein one end of the first air intake pipe (51) is connected to the air intake port on the furnace body (1), and the other end is connected to the exchange source channel outlet of the second heat exchanger (63); one end of the second air intake pipe (52) is connected to the exhaust gas channel outlet of the first heat exchanger (61), and the other end is connected to the exchange source channel inlet of the second heat exchanger (63).

5. The debinding device for producing ferrite cores according to claim 4, characterized in that: The circulating fan (3) is arranged on the second air inlet duct (52).

6. A binder removal device for ferrite core production according to claim 4 or 5, characterized in that: The air intake pipe assembly (5) further comprises an air intake frame (53), wherein the air intake frame (53) is connected to the first air intake pipe (51) via the air intake holes thereon, and the air intake frame (53) is provided with a plurality of air outlet holes (531), wherein the air outlet holes (531) are connected to the air intake port on the furnace body (1) via the second branch pipe (54).

7. The binder removal device for ferrite core production according to claim 2, characterized in that: The air outlet pipe assembly (4) comprises a main air outlet pipe (41), one end of which is connected to the combustion chamber (62), and the other end of which is connected to the air outlet on the furnace body (1) through a plurality of first branch pipes (42).

8. The binder removal device for ferrite core production according to claim 7, characterized in that: One end of the main air outlet pipe (41) close to the combustion chamber (62) is connected to a pressure relief pipe (44) via a pressure relief valve (43).

9. The debinding device for producing ferrite cores according to claim 1, characterized in that: The heating source (2) is a carbon rod, and a plurality of groups of the carbon rods are arranged along the length direction of the furnace body (1), and a placement space for the ferrite core stack (7) to enter is formed between adjacent carbon rod groups.

10. The binder removal device for ferrite core production according to claim 1, characterized in that: A bearing plate (8) is provided at the bottom of the furnace body (1), and the bearing plate (8) is connected to a lifting mechanism for driving the bearing plate (8) to move up and down.

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