Oriented silicon steel nitriding device

Abstract

The utility model relates to the technical field of metallurgy, and discloses an oriented silicon steel nitriding device which comprises a furnace body, a rotating frame used for containing a silicon steel coil is arranged in the furnace body, the rotating frame comprises a horizontally-arranged rotating shaft and a plurality of fixing frames evenly distributed in the circumferential direction of the rotating shaft, and an air injection assembly is installed in the furnace body; the gas injection assembly comprises gas distribution ring pipes, nozzles and a gas conveying pipe, the gas distribution ring pipes are fixedly connected to the outer wall of the furnace body, the rotating frame is arranged to enable a silicon steel coil to rotate, the guide mechanism is used for adjusting the ammonia gas injection direction, the contact uniformity of ammonia gas and the silicon steel coil can be remarkably improved, and therefore the nitriding treatment effect and quality are improved; and the guide mechanism adjusts the spraying direction of the ammonia gas to form a vortex, so that contact and collision between ammonia gas molecules and the surface of the silicon steel coil are accelerated, nitrogen atoms can be adsorbed on the surface of the silicon steel coil more quickly, mass transfer in the nitriding process is promoted, the nitriding time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and in particular to a nitriding apparatus for oriented silicon steel. Background Technology

[0002] In order to obtain good magnetic properties during the production process of grain-oriented silicon steel, nitriding treatment is usually required before the final high-temperature annealing to introduce external inhibitors and improve longitudinal magnetic properties. At present, the common nitriding treatment method is to place the silicon steel coil in the furnace, introduce ammonia gas into the furnace and heat it, and use ammonia gas to decarburize and nitrid the silicon steel.

[0003] However, this traditional nitriding method has obvious drawbacks. On the one hand, due to the lack of effective guidance for the direction of ammonia injection, the distribution of ammonia in the furnace is uneven, and it cannot accurately act on all parts of the silicon steel coil. On the other hand, the silicon steel is placed in the furnace in a coiled manner, which makes it difficult for ammonia to fully and evenly contact the surface of the silicon steel, thus seriously affecting the nitriding effect of the silicon steel coil. Moreover, due to the uneven contact between ammonia and silicon steel, the overall performance of the nitriding device is poor and cannot meet the requirements of high-quality grain-oriented silicon steel production. Therefore, a grain-oriented silicon steel nitriding device was proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a nitriding device for oriented silicon steel, so as to solve the problem that ammonia gas cannot make uniform contact with silicon steel in the prior art, resulting in poor nitriding treatment effect and poor device performance.

[0005] The nitriding apparatus for grain-oriented silicon steel provided in this application adopts the following technical solution:

[0006] A nitriding apparatus for oriented silicon steel includes a furnace body, wherein a rotating frame for placing silicon steel coils is provided inside the furnace body, and the rotating frame includes a horizontally arranged rotating shaft and a plurality of fixed frames evenly distributed around the rotating shaft.

[0007] The furnace body is equipped with an air jet assembly, which includes a gas distribution ring pipe, nozzles and a gas delivery pipe. Multiple nozzles are evenly distributed on the inner wall of the furnace body, multiple gas distribution ring pipes are fixedly connected to the outer wall of the furnace body, multiple nozzles are connected to multiple gas distribution ring pipes, and the gas delivery pipe is connected to multiple gas distribution ring pipes.

[0008] The inner wall of the furnace body is equipped with a guiding mechanism, which includes an annular mounting frame fixedly connected to the inner wall of the furnace body. Multiple nozzles are located between the annular mounting frame and the furnace body. Multiple guide plates are rotatably connected to the upper and lower inner walls of the annular mounting frame through a linkage shaft. The multiple guide plates are evenly distributed in a circumferential array with equal spacing.

[0009] Preferably, the guiding mechanism further includes a stepper motor, a drive gear ring, and linkage gears. The bottom ends of the multiple linkage shafts penetrate the furnace body and are fixedly connected to the multiple linkage gears. The drive gear ring is rotatably connected to the bottom outer wall of the furnace body through a bearing ring. The multiple linkage gears mesh with the drive gear ring. The end of the output shaft of the stepper motor is fixedly connected to the drive gear ring through a drive frame.

[0010] Preferably, a support frame is fixedly connected to the bottom outer wall of the furnace body, and the stepper motor is fixedly installed on the top middle outer wall of the support frame.

[0011] Preferably, a sealing cover is installed on the top outer wall of the furnace body, and a servo motor is fixedly installed on the top middle outer wall of the sealing cover. The end of the output shaft of the servo motor passes through the sealing cover and is fixedly connected to the top of the rotating shaft.

[0012] Preferably, a plurality of cylinders are fixedly installed on the outer wall of the furnace body. The plurality of cylinders are evenly distributed in a circumferential array at equal intervals, and their output ends are fixedly connected to the bottom outer wall of the sealing cover.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] This nitriding device for grain-oriented silicon steel significantly improves the uniformity of ammonia contact with the silicon steel coil by using a rotating frame to rotate the silicon steel coil and a guiding mechanism to adjust the direction of ammonia injection. This enhances the effectiveness and quality of the nitriding process, improves the performance of the grain-oriented silicon steel, and the guiding mechanism creates a vortex by adjusting the direction of ammonia injection. This accelerates the contact and collision between ammonia molecules and the surface of the silicon steel coil, which facilitates faster adsorption of nitrogen atoms on the surface of the silicon steel coil, promotes mass transfer during the nitriding process, shortens the nitriding time, and improves production efficiency. Attached Figure Description

[0015] Figure 1 This is an overall schematic diagram of an embodiment of the application;

[0016] Figure 2 This is a bottom-view perspective view of an embodiment of the application;

[0017] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0018] Figure 4 This is an exploded view of an embodiment of the application;

[0019] Figure 5 This is a partial exploded view of the structure of an embodiment of the application;

[0020] Figure 6 This is a partial exploded cross-sectional view of the structure of the application embodiment.

[0021] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Sealing cover; 3. Cylinder; 4. Servo motor; 5. Rotating shaft; 6. Fixing frame; 7. Support frame; 8. Gas distribution ring pipe; 9. Nozzle; 10. Gas supply pipe; 11. Annular mounting frame; 12. Guide plate; 13. Linkage shaft; 14. Linkage gear; 15. Bearing ring; 16. Drive gear ring; 17. Drive frame; 18. Stepper motor. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0023] This application discloses a nitriding apparatus for grain-oriented silicon steel. (See also...) Figure 1-6 The nitriding device for oriented silicon steel includes a furnace body 1, a rotating frame, an air jet assembly, and a guiding mechanism.

[0024] The rotating frame is installed inside the furnace body 1 to hold silicon steel coils. The rotating shaft 5 of the rotating frame is set horizontally, and multiple fixed frames 6 are evenly distributed around the rotating shaft 5. A sealing cover 2 is installed on the top outer wall of the furnace body 1. A servo motor 4 is fixedly installed on the top middle outer wall of the sealing cover 2. The end of the output shaft of the servo motor 4 passes through the sealing cover 2 and is fixedly connected to the top of the rotating shaft 5. Driven by the servo motor 4, the rotating shaft 5 drives the fixed frames 6 and the silicon steel coils placed on the fixed frames 6 to rotate.

[0025] The jet assembly includes a gas distribution ring pipe 8, a nozzle 9, and a gas delivery pipe 10. Multiple nozzles 9 are evenly distributed on the inner wall of the furnace body 1. Multiple gas distribution ring pipes 8 are fixedly connected to the outer wall of the furnace body 1, and multiple nozzles 9 are connected to multiple gas distribution ring pipes 8. The gas delivery pipe 10 is connected to multiple gas distribution ring pipes 8. In this way, ammonia gas enters the gas distribution ring pipe 8 through the gas delivery pipe 10 and is then sprayed into the furnace body 1 by the nozzles 9.

[0026] The guiding mechanism includes an annular mounting frame 11, guide plates 12, linkage shafts 13, linkage gears 14, bearing rings 15, drive gear rings 16, drive frames 17, and stepper motors 18. The annular mounting frame 11 is fixedly connected to the inner wall of the furnace body 1. Multiple nozzles 9 are located between the annular mounting frame 11 and the furnace body 1. Multiple guide plates 12 are rotatably connected to the upper and lower inner walls of the annular mounting frame 11 through the linkage shafts 13. The multiple guide plates 12 are evenly distributed in a circumferential array with equal spacing. The bottom ends of the multiple linkage shafts 13 penetrate the furnace body 1 and are fixedly connected to the multiple linkage gears 14. The drive gear ring 16 is rotatably connected to the bottom outer wall of the furnace body 1 through the bearing rings 15. The multiple linkage gears 14 mesh with the drive gear ring 16. The output shaft end of the stepper motor 18 is fixedly connected to the drive gear ring 16 through the drive frames 17. A support frame 7 is fixedly connected to the bottom outer wall of the furnace body 1. The stepper motor 18 is fixedly installed on the top middle outer wall of the support frame 7.

[0027] Multiple cylinders 3 are fixedly installed on the outer wall of the furnace body 1. The cylinders 3 are evenly distributed in a circular array with equal spacing. Their output ends are fixedly connected to the bottom outer wall of the sealing cover 2. The sealing cover 2 can be opened and closed by extending and retracting the cylinders 3, which facilitates the insertion and removal of silicon steel coils.

[0028] The furnace body 1 is heated using the principle of electromagnetic induction. An induction coil (not shown in the figure) is set on the inner wall of the furnace body 1. When an alternating current is passed through the induction coil, an alternating magnetic field is generated, which induces current (eddy current) in the metal parts such as silicon steel coils inside the furnace body 1. The heating effect of the eddy current is used to heat the inside of the furnace body 1 to achieve the temperature conditions required for nitriding.

[0029] The implementation principle of the nitriding device for oriented silicon steel in this application embodiment is as follows: The cylinder 3 is activated, causing the sealing cover 2 to rise and open the furnace body 1, allowing the silicon steel coil to be nitrided to be placed on the fixed frame 6 of the rotating frame. After placement, the cylinder 3 is activated again, causing the sealing cover 2 to fall and close the furnace body 1, ensuring the sealing of the furnace body 1.

[0030] Turn on the power to the induction coil and use electromagnetic induction to heat the inside of the furnace body 1 so that the furnace body 1 reaches the appropriate temperature required for nitriding. At the same time, turn on the gas supply pipe 10 to deliver ammonia gas to the gas distribution ring pipe 8, and then spray it into the furnace body 1 through the nozzle 9. Start the servo motor 4, and the servo motor 4 drives the rotating shaft 5 to rotate, which in turn makes the fixed frame 6 and the silicon steel coil rotate, ensuring that all parts of the silicon steel coil can fully contact the ammonia gas.

[0031] To further improve the uniformity of ammonia distribution, stepper motor 18 is started. Stepper motor 18 drives drive gear ring 16 to rotate through drive frame 17. Since drive gear ring 16 meshes with multiple linkage gears 14, linkage gears 14 drive linkage shaft 13 to rotate, thereby causing guide plate 12 to rotate. When multiple guide plates 12 are tilted at a certain angle, the ammonia gas sprayed from nozzle 9 will form a vortex in furnace body 1 under the guidance of guide plate 12. This vortex-shaped ammonia gas flow can make ammonia gas fully mixed in furnace body 1, avoiding local ammonia gas concentration that is too high or too low, making the ammonia gas concentration around each part of silicon steel coil more uniform, thereby improving the consistency of nitriding. In addition, the formation of vortex accelerates the contact and collision between ammonia gas molecules and the surface of silicon steel coil, which is conducive to nitrogen atoms being adsorbed on the surface of silicon steel coil more quickly, promoting mass transfer in the nitriding process and shortening the nitriding time.

[0032] After a certain period of nitriding treatment, the gas supply pipe 10 is closed to stop the delivery of ammonia gas, the power supply to the servo motor 4, the stepper motor 18 and the induction coil is turned off, the cylinder 3 is started to raise the sealing cover 2 to open the furnace body 1, and the silicon steel coil that has been nitrided is taken out from the fixed frame 6.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. Nitriding installation for oriented silicon steel comprising a furnace body (1), characterized in that: The rotating frame for placing silicon steel coil is arranged in the furnace body (1), and the rotating frame comprises a rotating shaft (5) arranged horizontally and a plurality of fixing frames (6) uniformly distributed along the circumference of the rotating shaft (5). The inside of the furnace body (1) is provided with a gas injection assembly, which comprises a gas distribution ring pipe (8), a spray head (9) and a gas supply pipe (10). A plurality of spray heads (9) are uniformly distributed on the inner wall of the furnace body (1), a plurality of gas distribution ring pipes (8) are fixedly connected to the outer wall of the furnace body (1), a plurality of spray heads (9) are connected with a plurality of gas distribution ring pipes (8), and the gas supply pipe (10) is connected with a plurality of gas distribution ring pipes (8). The inner wall of the furnace body (1) is provided with a guide mechanism, which comprises an annular mounting frame (11) fixedly connected to the inner wall of the furnace body (1), a plurality of spray heads (9) located between the annular mounting frame (11) and the furnace body (1), and a plurality of guide plates (12) rotatably connected to the upper and lower inner walls of the annular mounting frame (11) through linkage shafts (13). The plurality of guide plates (12) are uniformly distributed in an equidistant circumferential array.

2. The nitriding apparatus for oriented silicon steel according to claim 1, characterized by: The guide mechanism further comprises a stepping motor (18), a drive gear ring (16) and a linkage gear (14). The bottom ends of the plurality of linkage shafts (13) penetrate the furnace body (1) and are fixedly connected with the plurality of linkage gears (14). The drive gear ring (16) is rotatably connected to the bottom outer wall of the furnace body (1) through a bearing ring (15). The plurality of linkage gears (14) are engaged with the drive gear ring (16). The output shaft of the stepping motor (18) is fixedly connected with the drive gear ring (16) through a drive frame (17).

3. The orienting nitriding apparatus for silicon steel as claimed in claim 2, characterized by: The bottom outer wall of the furnace body (1) is fixedly connected with a support frame (7), and the stepping motor (18) is fixedly installed on the top middle outer wall of the support frame (7).

4. The orienting nitriding apparatus for silicon steel according to claim 3, characterized by: The top outer wall of the furnace body (1) is provided with a sealing cover (2), and the top middle outer wall of the sealing cover (2) is fixedly provided with a servo motor (4). The output shaft of the servo motor (4) penetrates the sealing cover (2) and is fixedly connected with the top end of the rotating shaft (5).

5. The nitriding apparatus for oriented silicon steel according to claim 4, characterized by: The outer wall of the furnace body (1) is fixedly provided with a plurality of air cylinders (3), and the plurality of air cylinders (3) are uniformly distributed in an equidistant circumferential array. The output ends of the plurality of air cylinders (3) are fixedly connected to the bottom outer wall of the sealing cover (2).

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