Permanent magnetic ferrite magnetic shoe steam preheating sintering device and operation method thereof
By using an electric heating steam generator in the permanent magnet ferrite tile sintering device to generate high-temperature steam, the steam preheating and rapid heat exchange of the blank body is achieved, and the problem of slow water discharge caused by the slow temperature increase rate of the blank body during the sintering process is solved, and the stability and mechanical strength of the sintering process are improved.
Patent Information
- Application Number
- CN202411926885.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-03-28
AI Technical Summary
During the sintering process, the internal temperature rise rate of the permanent magnet ferrite magnetic tile is slow, resulting in slow water discharge, which can easily cause damage to the body structure and cracks.
A permanent magnet ferrite magnetic tile steam preheating and sintering device is designed, and high-temperature steam is generated by using an electric heating steam generator, and steam is sent into the kiln cavity through the main pipe and branch pipe, so as to realize steam preheating and rapid heat exchange of the blank, and reduce the temperature difference between the inside and outside the blank.
Through steam preheating and sintering technology, the moisture inside the blank can be quickly discharged in the form of water vapor, avoiding structural damage caused by rapid heating, and improving the stability and mechanical strength of the sintering process.
Smart Images
Figure CN119713851A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of permanent ferrite wet-pressed magnetic tile manufacturing, and in particular relates to a permanent ferrite magnetic tile steam preheating sintering device and an operating method thereof. Background Art
[0002] The manufacturing process of permanent ferrite wet pressed magnetic tiles is: wet ball milling of raw iron red (Fe2O3, Fe3O4) → pressing into green compacts → sintering → grinding → cleaning and packaging → finished products.
[0003] Sintering is a key step in the manufacture of magnetic tiles. A series of physical and chemical reactions occur under high temperature conditions to remove moisture from the green body, shrink it and give it stable magnetic properties.
[0004] The density of wet pressed green body is 3.0-3.2g / cm3, and the density of semi-finished product after sintering is 4.9-5.1g / cm3, mainly because the gaps between magnetic domain particles in the green body contain 10-15% water. During the sintering temperature rising stage, the water in the green body is discharged from the green body in the form of steam.
[0005] Since the sintering electric kiln uses electric heating wires and silicon carbon rod electric heating elements for heating, the green body is mainly heated in the form of radiation. The surface temperature of the electric heating element is high, and the green body usually enters the electric kiln track cavity at room temperature. Ferrite is a poor conductor of heat. When the green body enters the kiln cavity track for heating, its surface temperature rises quickly, while the temperature rises slowly inside the green body. As the track drive drives the green body to move forward continuously, the temperature rises rapidly. The moisture on the green body surface evaporates quickly, while the temperature inside the green body is relatively low, with a large temperature difference from the surface, and the discharge path is narrow and tortuous, so the internal moisture is discharged slowly.
[0006] When the temperature inside the electric kiln is raised to 100-250°C, the temperature inside the green body rises faster, and the water molecules in the green body move violently, expand, volatilize and discharge due to the heat, which can easily cause the green body to be damaged by force, and then cause obvious cracks or hidden cracks in the green body, affecting the mechanical strength. Therefore, the present application proposes a steam preheating sintering device for permanent ferrite magnetic tiles and an operating method thereof. Summary of the invention
[0007] The object of the present invention is to provide a permanent magnet ferrite tile steam preheating sintering device and an operating method thereof to solve the problems raised by the above background technology.
[0008] To achieve the above object, the present invention provides the following technical solution: a permanent magnet ferrite tile steam preheating sintering device, comprising a kiln body and an electric heating steam generator, wherein the output port of the electric heating steam generator is connected to a main pipeline;
[0009] The main pipeline is connected to at least two branch pipelines, wherein the two branch pipelines penetrate the kiln body and are inserted into the upper and lower parts of the kiln cavity respectively, and the two branch pipelines inserted into the upper and lower parts of the kiln cavity are respectively connected to the upper steam pipeline and the lower steam pipeline, and the upper steam pipeline and the lower steam pipeline are both provided with a plurality of vents;
[0010] A plurality of branch moisture exhaust pipes are arranged on the top of the kiln body, and a plurality of the branch moisture exhaust pipes are connected to the main moisture exhaust pipe.
[0011] Preferably, the bottom of the kiln body comprises a plurality of legs, which are supported on a pad, a kiln cavity is arranged inside the kiln body, and two groups of humidity detection devices are respectively installed on the top and bottom of the kiln cavity.
[0012] Preferably, the main pipeline is installed with an automatic temperature controller and a pressure regulating valve, the pressure regulating valve is used to adjust the air pressure of the steam flowing in the main pipeline, and the automatic temperature controller is used to adjust the temperature of the steam flowing in the main pipeline, wherein the working temperature of the automatic temperature controller is 100-180°C, and the working pressure of the pressure regulating valve is 0.5-1.0Mpa.
[0013] Preferably, the main pipeline and the branch pipeline are connected via a tee pipe, and the branch pipeline includes a plurality of horizontal pipes and vertical pipes, and the horizontal pipes and the vertical pipes are connected via right-angle elbows.
[0014] Preferably, a control valve is installed on the branch pipeline, and the control valve is used to open and close the channel for circulating steam in the branch pipeline.
[0015] Preferably, the distances between two adjacent vent holes are the same, the two groups of vent holes in the upper steam pipe and the lower steam pipe are both facing the kiln track, and the ends of the upper steam pipe and the lower steam pipe are both closed.
[0016] Preferably, the vent hole is configured to be trumpet-shaped, and the vent hole includes a narrow opening and a wide opening, the narrow opening is connected to one of the upper steam pipe and the lower steam pipe, and the wide opening faces the kiln track located in the middle of the kiln cavity.
[0017] Preferably, a kiln track penetrates the kiln body, the kiln track is located in the middle of the kiln cavity, a plurality of firing plates movable along the kiln track are installed on the kiln track, and a blank is arranged on the upper side of the firing plate.
[0018] Preferably, the branch dehumidification pipe penetrates the kiln body and the end of the branch dehumidification pipe is inserted into the top of the kiln cavity, and a dehumidification regulating valve is installed in each branch dehumidification pipe, and the dehumidification regulating valve is used to control the corresponding branch dehumidification pipe to open or close.
[0019] A method for using a steam preheating and sintering device for permanent ferrite magnetic tiles. The steam preheating and sintering device for permanent ferrite magnetic tiles comprises the following steps during use:
[0020] Step 1: Feeding the blank: placing the blank on the firing plate, pushing the firing plate to move along the kiln track, and feeding the blank into the kiln cavity in the kiln body;
[0021] Step 2: Send high-temperature steam into the kiln cavity; turn on the electric heating steam generator, and the high-temperature steam produced by the generator flows through the main pipeline and the branch pipeline, and finally the steam is discharged from the vents in the upper steam pipeline and the lower steam pipeline connected to the two sets of branch pipelines;
[0022] Step 3, heating the green body by high-temperature steam; the high-temperature steam discharged from the vent hole mentioned in step 2 is discharged toward the green body, and the high-temperature steam enters the inside of the kiln cavity, and transmits heat energy to the green body in three ways: radiation, convection, and conduction. The moisture in the green body is discharged in the form of water vapor after heating;
[0023] Step 4: Exhaust moisture from the kiln cavity. After the heat of the high-temperature steam is transferred to the green body, the heat contained in the steam is reduced. The steam after heat exchange and the water vapor converted from the moisture inside the green body enter the branch moisture exhaust pipe at the top of the kiln cavity together. The moisture in multiple branch moisture exhaust pipes is collected in the moisture exhaust main pipe and discharged from the outlet of the moisture exhaust main pipe.
[0024] Step 5: Unloading the green body: Move the carrier plate on which the green body is located and take the green body out of the kiln cavity.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] 1. The green body of the present invention enters the interior of the kiln cavity and fully exchanges heat under the action of steam. Heat quickly enters the interior of the green body, reducing the temperature difference between the inside and outside of the green body. After the green body is heated, the moisture in the green body is discharged in the form of water vapor, and the moisture on the surface of the green body will not evaporate and dry due to rapid heating, and there will be no situation where the green body structure is damaged due to excessive difference in moisture content between the inside and outside of the green body.
[0027] 2. The present invention is internally provided with a humidity detection device, which is used to measure the humidity at the top and bottom of the inner side of the kiln chamber. During the sintering process of the green body, the dehumidification regulating valve can be opened and closed, and the number of branch dehumidification pipes that are open can be adjusted. The corresponding control valve and pressure regulating valve can also be adjusted to control the amount of steam entering the kiln chamber, thereby controlling the humidity inside the kiln chamber and providing a suitable humidity environment for the green body sintering. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is one of the structural schematic diagrams of the steam preheating sintering device for permanent ferrite magnetic tiles in the present invention.
[0029] Figure 2 For the present invention Figure 1 Schematic diagram of the structure at A in the middle.
[0030] Figure 3 For the present invention Figure 1 Schematic diagram of the structure at B in the figure.
[0031] Figure 4 This is the second structural schematic diagram of the steam preheating sintering device for permanent ferrite magnetic tiles in the present invention.
[0032] In the figure: 1. Electric heating steam generator; 2. Automatic temperature controller; 3. Pressure regulating valve; 4. Control valve; 5. Kiln chamber; 6. Kiln track; 7. Upper steam pipe; 8. Lower steam pipe; 9. Vent; 10. Humidity detection device; 11. Green body; 12. Kiln body; 13. Main dehumidification pipe; 14. Dehumidification regulating valve; 15. Branch dehumidification pipe; 16. Pad. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.
[0034] Reference Figure 1-Figure 4 A steam preheating sintering device for permanent ferrite magnetic tiles includes a kiln body 12, which is a steam sintering kiln. The bottom of the kiln body 12 includes a plurality of legs, which are against a pad 16. The sintering furnace refers to a special device for obtaining the required physical, mechanical properties and microstructure of the powder compact by sintering. The sintering furnace is used to dry the slurry on the silicon wafer, remove the organic components in the slurry, and complete the sintering of the aluminum back field and the grid line. In order to ensure the smooth dewaxing (lubricant or forming agent), reduction, alloying, and organizational transformation of the powder compact during the sintering process, the sintering temperature, protective atmosphere, compact conveying method, heating and cooling speed, etc. need to be accurately controlled during sintering.
[0035] Therefore, the sintering furnace should meet the following requirements in structure:
[0036] (1) It has a complete lubricant burning device (commonly known as dewaxing belt).
[0037] (2) It is airtight, that is, it can isolate the air outside the furnace and ensure the smooth flow of protective atmosphere inside the furnace.
[0038] (3) The temperature of each section in the furnace is controllable and the sintering atmosphere is adjustable.
[0039] (4) It has a rapid cooling device that can quickly cool the sintered parts to the furnace outlet temperature without oxidation.
[0040] It also includes an electric heating steam generator 1. When the electric heating steam generator 1 is started, it can produce steam, and the steam is discharged from the output port. The output port of the electric heating steam generator 1 is connected to the main pipeline. The main pipeline is equipped with an automatic temperature controller 2 and a pressure regulating valve 3. The pressure regulating valve 3 is used to adjust the air pressure of the steam flowing in the main pipeline. The automatic temperature controller 2 is used to adjust the temperature of the steam flowing in the main pipeline. The working temperature of the automatic temperature controller 2 is 100-180°C (the above temperature is the adjustable range of the automatic temperature controller 2), and the working pressure of the pressure regulating valve 3 is 0.5-1.0Mpa (the above pressure is the adjustable pressure range of the pressure regulating valve 3).
[0041] The electric heating steam generator 1 is a device that uses electric energy to heat water to boiling and convert it into steam. The working principle of the electric heating steam generator 1:
[0042] Water supply: Access the water source through pipes or water storage tanks to provide sufficient water for the equipment.
[0043] Heating process: The internal electric heating element heats the water to boiling.
[0044] Steam Generation: When water reaches boiling point, it quickly turns into steam. This steam is transported through pipes inside the device to the output port.
[0045] Specifically, the main pipeline is connected to at least two branch pipelines, and the main pipeline and the branch pipeline are connected by a tee pipe. The branch pipeline includes several horizontal pipes and vertical pipes, and the horizontal pipes and the vertical pipes are connected by right-angle elbows. A control valve 4 is installed on the branch pipeline, and the control valve 4 is used to open and close the channel for circulating steam in the branch pipeline.
[0046] Two of the branch pipes penetrate the kiln body 12 and are inserted into the upper and lower parts of the kiln cavity 5 respectively. The two branch pipes inserted into the upper and lower parts of the kiln cavity 5 are connected to the upper steam pipe 7 and the lower steam pipe 8 respectively. A plurality of air vents 9 are arranged in the upper steam pipe 7 and the lower steam pipe 8. The spacing between adjacent air vents 9 is the same, and the spacing between adjacent air vents 9 is P. The two groups of air vents 9 in the upper steam pipe 7 and the lower steam pipe 8 are both facing the kiln track 6. The air vents 9 are arranged in a trumpet shape. Specifically, the air vents 9 include a narrow opening and a wide opening. The narrow opening is connected to one of the upper steam pipe 7 and the lower steam pipe 8, and the wide opening faces the kiln track 6 located in the middle part of the kiln cavity 5. The ends of the upper steam pipe 7 and the lower steam pipe 8 are both closed.
[0047] In a further embodiment, a kiln track 6 penetrates the kiln body 12, and the kiln track 6 is located in the middle position of the kiln cavity 5. A plurality of supporting plates that can move along the kiln track 6 are installed on the kiln track 6, and a blank 11 is arranged on the upper side of the supporting plate. The blank 11 is placed on the supporting plate, and the supporting plate can move along the kiln track 6 and can enter into the kiln cavity 5 or move out from the kiln cavity 5 along the kiln track 6, thereby realizing the feeding and discharging of the blank 11, and the two groups of vents 9 in the upper steam pipe 7 and the lower steam pipe 8 are both oriented towards the blank 11 located therebetween, and the blank 11 is heated at the same time.
[0048] It should be noted that a plurality of branch dehumidification pipes 15 are arranged on the top of the kiln body 12, the branch dehumidification pipes 15 penetrate the kiln body 12 and the ends of the branch dehumidification pipes 15 are inserted into the top of the kiln cavity 5, and the plurality of branch dehumidification pipes 15 are connected to the main dehumidification pipe 13. It should be noted that a dehumidification regulating valve 14 is installed in each branch dehumidification pipe 15, and the dehumidification regulating valve 14 is used to control the corresponding branch dehumidification pipe 15 to open or close.
[0049] In a further embodiment, a kiln cavity 5 is provided inside the kiln body 12, and two groups of humidity detection devices 10 are respectively installed on the top and bottom of the kiln cavity 5. The humidity detection device 10 is used to measure the humidity at the top and bottom of the inner side of the kiln cavity 5, and can automatically or manually control the water vapor content (during control, the dehumidification regulating valve 14 can be opened and closed, the number of branch dehumidification pipes 15 in the open state can be adjusted, and the corresponding control valve 4 and pressure regulating valve 3 can also be adjusted to control the amount of steam entering the kiln cavity 5 and control the humidity inside the kiln cavity 5).
[0050] The green body 11 entering the kiln chamber 5 fully exchanges heat under the action of steam, and heat quickly enters the interior of the green body 11, reducing the temperature difference between the inside and outside of the green body 11. After the green body 11 is heated, the moisture in the green body 11 is discharged in the form of water vapor, and the moisture on the surface of the green body 11 will not evaporate and dry due to rapid heating, and there will be no situation where the moisture content inside and outside the green body 11 is too different, causing the structure of the green body 11 to be damaged.
[0051] A method for using a steam preheating sintering device for permanent ferrite magnetic tiles comprises the following steps:
[0052] 1. Feeding the blank 11; placing the blank 11 on the firing plate, pushing the firing plate to move along the kiln track 6, and feeding the blank 11 into the kiln cavity 5 in the kiln body 12;
[0053] Second, high-temperature steam is sent into the kiln cavity 5; the electric heating steam generator 1 is turned on, and the high-temperature steam produced by the operation flows through the main pipeline and the branch pipeline, and finally the steam is discharged from the vent 9 in the upper steam pipeline 7 and the lower steam pipeline 8 connected to the two sets of branch pipelines.
[0054] 3. Heating the green body 11 by high-temperature steam; the high-temperature steam discharged from the vent hole 9 mentioned in step 2 is discharged toward the green body 11, and the high-temperature steam enters the kiln cavity 5, and transmits heat energy to the green body 11 in three ways: radiation, convection, and conduction. The moisture in the green body 11 is discharged in the form of water vapor after heating.
[0055] 4. Expel moisture from the kiln cavity 5; after the heat of the high-temperature steam is transferred to the green body 11, the heat contained in the steam is reduced, and the steam after heat exchange and the water vapor converted from the moisture inside the green body 11 enter the branch dehumidification pipe 15 at the top of the kiln cavity 5 together, and the moisture in the multiple branch dehumidification pipes 15 is collected in the dehumidification main pipe 13 and discharged from the outlet of the dehumidification main pipe 13.
[0056] 5. Unloading of the green body 11: Move the carrier plate on which the green body 11 is located, and take the green body 11 out of the kiln chamber 5. In order to arrange the unloading of the green body 11, the steam in the kiln chamber 5 can be exhausted before the unloading.
[0057] Working principle:
[0058] The green body 11 enters the interior of the kiln chamber 5, and under the action of steam, sufficient heat exchange is carried out, and heat quickly enters the interior of the green body 11, reducing the temperature difference between the inside and outside of the green body 11. After the green body 11 is heated, the moisture in the green body 11 is discharged in the form of water vapor, and the moisture on the surface of the green body 11 will not evaporate and dry due to rapid heating, and there will be no situation where the moisture content inside and outside the green body 11 is too different, causing the structure of the green body 11 to be damaged.
[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A steam preheating sintering device for permanent ferrite magnetic tiles, comprising a kiln body (12), characterized in that: It also includes an electric heating steam generator (1), the output port of the electric heating steam generator (1) is connected to the main pipeline; The main pipeline is connected to at least two branch pipelines, wherein the two branch pipelines penetrate the kiln body (12) and are inserted into the upper and lower parts of the kiln cavity (5), respectively. The two branch pipelines inserted into the upper and lower parts of the kiln cavity (5) are respectively connected to an upper steam pipeline (7) and a lower steam pipeline (8), and a plurality of vent holes (9) are provided in the upper steam pipeline (7) and the lower steam pipeline (8); A plurality of branch moisture exhaust pipes (15) are arranged on the top of the kiln body (12), and the plurality of branch moisture exhaust pipes (15) are connected to the main moisture exhaust pipe (13).
2. A permanent magnet ferrite tile steam preheating sintering device according to claim 1, characterized in that: The bottom of the kiln body (12) comprises a plurality of legs, which are supported on a pad (16). A kiln cavity (5) is arranged inside the kiln body (12), and two groups of humidity detection devices (10) are respectively installed on the top and bottom of the kiln cavity (5).
3. A steam preheating sintering device for permanent ferrite magnetic tiles according to claim 1, characterized in that: The main pipeline is equipped with an automatic temperature controller (2) and a pressure regulating valve (3). The pressure regulating valve (3) is used to adjust the pressure of the steam flowing in the main pipeline, and the automatic temperature controller (2) is used to adjust the temperature of the steam flowing in the main pipeline. The working temperature of the automatic temperature controller (2) is 100-180° C., and the working pressure of the pressure regulating valve (3) is 0.5-1.0 Mpa.
4. A steam preheating sintering device for permanent ferrite magnetic tiles according to claim 1, characterized in that: The main pipeline is connected to the branch pipeline via a tee pipe, and the branch pipeline includes a plurality of horizontal pipes and vertical pipes, and the horizontal pipes and the vertical pipes are connected via right-angle elbows.
5. A steam preheating sintering device for permanent ferrite magnetic tiles according to claim 4, characterized in that: A control valve (4) is installed on the branch pipeline, and the control valve (4) is used to open and close the channel for circulating steam in the branch pipeline.
6. The steam preheating sintering device for permanent ferrite magnetic tiles according to claim 1 is characterized in that: The spacing between two adjacent vent holes (9) is the same, the two groups of vent holes (9) in the upper steam pipe (7) and the lower steam pipe (8) are both facing the kiln track (6), and the ends of the upper steam pipe (7) and the lower steam pipe (8) are both closed.
7. A steam preheating sintering device for permanent ferrite magnetic tiles according to claim 6, characterized in that: The vent hole (9) is configured to be trumpet-shaped. The vent hole (9) includes a narrow opening and a wide opening. The narrow opening is connected to one of the upper steam pipe (7) and the lower steam pipe (8), and the wide opening faces the kiln track (6) located in the middle of the kiln cavity (5).
8. The steam preheating sintering device for permanent ferrite magnetic tiles according to claim 1 is characterized in that: A kiln track (6) penetrates the kiln body (12), and the kiln track (6) is located in the middle of the kiln cavity (5). A plurality of firing plates that can move along the kiln track (6) are installed on the kiln track (6), and a blank (11) is arranged on the upper side of the firing plate.
9. The steam preheating sintering device for permanent ferrite magnetic tiles according to claim 1, characterized in that: The branch dehumidification pipe (15) penetrates the kiln body (12) and the end of the branch dehumidification pipe (15) is inserted into the top of the kiln cavity (5). A dehumidification regulating valve (14) is installed in each branch dehumidification pipe (15). The dehumidification regulating valve (14) is used to control the corresponding branch dehumidification pipe (15) to be opened or closed.
10. A method for using a steam preheating sintering device for permanent ferrite magnetic tiles, characterized in that: The steam preheating sintering device for permanent ferrite magnetic tiles according to any one of claims 1 to 9 is used, and the use process thereof includes the following steps: Step 1, feeding the blank (11); placing the blank (11) on a firing plate, pushing the firing plate to move along the kiln track (6), and feeding the blank (11) into the kiln cavity (5) in the kiln body (12); Step 2: High-temperature steam is introduced into the kiln cavity (5); the electric heating steam generator (1) is turned on, and the high-temperature steam produced by the generator flows through the main pipeline and the branch pipeline, and finally the steam is discharged from the vent holes (9) in the upper steam pipeline (7) and the lower steam pipeline (8) connected to the two sets of branch pipelines; Step 3, heating the green body (11) by high-temperature steam; the high-temperature steam discharged from the vent hole (9) mentioned in step 2 is discharged toward the green body (11), and the high-temperature steam enters the inside of the kiln cavity (5), and transmits heat energy to the green body (11) in three ways: radiation, convection, and conduction. After heating, the moisture in the green body (11) is discharged in the form of water vapor; Step 4, exhausting moisture in the kiln cavity (5); after the heat of the high-temperature steam is transferred to the green body (11), the heat contained in the steam is reduced, and the steam after heat exchange and the water vapor converted from the moisture inside the green body (11) enter the branch moisture exhaust pipe (15) at the top of the kiln cavity (5), and the moisture in the multiple branch moisture exhaust pipes (15) is collected in the moisture exhaust main pipe (13) and discharged from the outlet of the moisture exhaust main pipe (13); Step 5: unloading the green body (11); moving the carrier plate on which the green body (11) is located, and taking the green body (11) out of the kiln chamber (5).