A brake disc oxygen-nitrogen co-diffusion device and process

Abstract

The present invention relates to the field of coating, and more particularly to an oxygen-nitrogen co-diffusion device and process for brake discs, comprising a heating furnace, wherein an air intake pipe is embedded through the front edge of the side of the heating furnace, and an air distribution pipe is fixedly connected to the end of the air intake pipe, and a plurality of groups of air ducts are fixedly connected in a linear array on the outer surface of the air distribution pipe, and each group of the air ducts has two air ducts, and the ends of the two air ducts are fixedly connected to a jet disk, and the opposite surfaces of the two jet disks are penetrated by a plurality of air outlet holes in a circular array, and a heat conducting part is installed on the air intake pipe, and a gas mixing part is installed on the lower part of the side of the heating furnace, and the gas mixing part is connected to the air intake pipe. The present invention adds a porous Fe 3 O 4 The oxide layer zone composed of the above-mentioned components can effectively improve the heat dissipation and anti-adhesion performance of the brake disc, shorten the production cycle, improve the production quality and reduce gas waste.

Description

Technical Field

[0001] The invention relates to the field of coating, and in particular to an oxygen-nitrogen co-diffusion device and process for a brake disc. Background Art

[0002] At present, automobile brake discs are generally made of HT250 material, which mainly has a braking effect. The braking force comes from the brake caliper. The general brake caliper is fixed to the part where the inner brake piston pump is located, and the outer side is a caliper-type structure. The inner brake pad is fixed on the piston pump, and the outer brake pad is fixed on the outside of the caliper. The piston pushes the inner brake pad through the pressure from the brake oil pipe, and at the same time pulls the caliper through the reaction force, so that the outer brake pad moves inward. Both press against the brake disc at the same time, and the braking force is generated by the friction between the brake disc and the inner and outer brake pads.

[0003] During the production process, brake discs are often subjected to nitriding treatment. However, the existing conventional nitriding process takes a long time, and the nitriding layer is dense and has poor heat dissipation, which can easily lead to high temperature due to friction between the brake disc and the brake pad, affecting its service life. At the same time, during the production process, nitrogen is directly dispersed in the heating furnace after being added and cannot fully act on the brake disc. At this time, more gas needs to be introduced to fill the furnace to ensure that the gas is in full contact with the brake disc, and the process results in a large waste of gas. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a brake disc oxygen-nitrogen co-diffusion device and process.

[0005] To achieve the above objectives, the technical solution adopted in the present invention is: a brake disc oxygen-nitrogen co-diffusion device, comprising a heating furnace, an air intake pipe is embedded through the front edge of the side of the heating furnace, the end of the air intake pipe is fixedly connected with an air distribution pipe, the outer surface of the air distribution pipe is linearly arrayed and fixedly connected with a plurality of groups of air ducts, each group of the air ducts has two air ducts, the ends of the two air ducts are fixedly connected with jet disks, the opposite surfaces of the two jet disks are both circularly arrayed with a plurality of air outlet holes, a heat conductor is installed on the air intake pipe, a mixing component is installed on the lower part of the side of the heating furnace, and the mixing component is connected to the air intake pipe.

[0006] Preferably, a furnace door is installed at the front end of the heating furnace, and a plurality of sheet frames are fixedly installed in a linear array at the rear end of the heating furnace. The sheet frames extend between two jet disks, and a centering column is embedded in the front end of the sheet frames. The center line of the centering column is colinear with the center line of the jet disk, and a plurality of connecting sheets are embedded in the internal linear array of the sheet frames.

[0007] Preferably, the heat conductor includes a plurality of guide vanes fixedly mounted in a linear array on the upper end of the air inlet pipe, the guide vanes extending into the interior of the air inlet pipe, the guide vanes being located in a heating furnace, the interior linear array of the air inlet pipe being coaxially inlaid with a plurality of air blocking rings, the interior linear array of the air inlet pipe being coaxially arranged with a plurality of air blocking vanes, the air blocking vanes and the air blocking rings being staggered, a gap being left between the air blocking vanes and the inner wall of the air inlet pipe, the upper end of the air blocking vane and the upper end of the air blocking ring being fixed to the guide vanes.

[0008] Preferably, the mixing element includes an extension frame fixedly installed on the lower side of the heating furnace, a pipe rack is fixedly installed on the upper end of the extension frame, air guide pipes are fixedly installed at both ends of the pipe rack, a front end side of the front air guide pipe is fixedly connected to the air inlet pipe, and one end of the rear air guide pipe is fixedly connected to the air collecting pipe, and three air inlets are arranged in a linear array on the side of the air collecting pipe.

[0009] Preferably, one side of the front end of the rear air duct is fixedly connected to the other side of the rear end of the front air duct, one end of the front air duct and the other end of the rear air duct are both penetrated by pistons slidably installed, push columns are coaxially extended on the sides of the two pistons, and a connecting frame is embedded between the ends of the two push columns.

[0010] Preferably, a motor seat is fixedly installed at the rear end of the extension frame, a servo motor is fixedly installed at the upper end of the motor seat, a rotating ear is extended from the output end of the servo motor, a plug pusher frame is rotatably installed at the end of the rotating ear, the end of the plug pusher frame is rotatably connected to the connecting frame, and a tooth plate is slidably installed at the upper ends of the two air guide tubes, a top frame is fixedly installed at the end of the tooth plate, and the end of the top frame is fixed to the piston.

[0011] Preferably, two rotating shafts are symmetrically installed inside the air duct for rotation, the upper end of the rotating shaft passes through the upper end of the air duct, and a gear is coaxially inlaid on the upper end of the rotating shaft, which is meshed with a toothed plate, and a plurality of paddles are fixedly installed in an annular array on the outer surface of the rotating shaft, a T-shaped guide groove is provided at the front end of the toothed plate, a T-shaped guide seat is fitted inside the T-shaped guide groove, a fixed frame is inlaid at the front end of the T-shaped guide seat, and two frame ears are symmetrically extended from the lower end of the fixed frame, and the ends of the frame ears are fixed to the air duct.

[0012] A brake disc oxy-nitrogen co-diffusion process is also provided, comprising the following steps:

[0013] S1: The center hole sleeve of the brake disc is placed on the centering column and supported by the frame so that the brake disc is located between the two jet discs. The heating furnace is then heated to 350 degrees and maintained at this temperature for 30 minutes. During this process, only nitrogen is introduced through the air inlet for nitriding;

[0014] S2: The heating furnace is then heated to 450-500 degrees and maintained at this temperature for 120 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet to achieve oxygen-nitrogen co-penetration, so that the surface of the brake disc quickly absorbs nitrogen atoms and forms diffusely distributed nitrides;

[0015] S3: The heating furnace is then heated to 520-550 degrees and maintained at this temperature for 360 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet to accelerate the diffusion of nitrogen in the brake disc and increase the depth of the nitriding layer. At the same time, the infiltrated oxygen forms a porous Fe3O4 layer with Fe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The brake disc is treated with oxygen-nitrogen co-diffusion to add an oxide layer composed of porous Fe3O4 outside the nitride layer, which can effectively improve the heat dissipation and anti-adhesion performance of the brake disc and shorten the production cycle.

[0018] 2. When nitrogen, ammonia and air enter the air duct through the three air inlets respectively, the servo motor will work to drive the push plug rack to move through the rotating ear to push the tooth plate, so that the tooth plate moves back and forth continuously under the guidance of the T-shaped guide seat, thereby driving the gear to rotate, so that the paddle on the rotating shaft can continuously reciprocate to stir the three gases in the air duct and mix them evenly. In this process, the push plug rack will also continuously drive the piston to slide in the air duct to continuously block or open the air outlet of the air duct to delay the time for the gas to pass through the air duct, that is, to extend the stirring time of the gas to further promote its even mixing, and evenly and fully guide it to the surface of the brake disc through the air outlet on the jet disc, so as to ensure that the brake disc and the three gases are in even and sufficient contact, avoid uneven penetration, thereby improving production quality and reducing gas waste.

[0019] 3. The guide plates, air blocking plates and air blocking rings are arranged to absorb the heat in the heating furnace and conduct it to the gas in the intake pipe to increase the contact area between the gas and the heat, so that the gas can be preheated. At the same time, when the gas passes through the gaps on the multiple air blocking rings and the gaps between the multiple air blocking plates and the intake pipes in sequence, the time for the gas to pass through can be delayed, so that the gas can be fully preheated, thereby ensuring that the temperature change of the brake disc is not affected when the gas contacts with the brake disc, that is, ensuring that the brake disc is produced at the specified temperature, thereby further improving its production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a brake disc oxygen-nitrogen co-diffusion device according to the present invention;

[0021] Figure 2It is a schematic diagram of an air guide pipe of a brake disc oxygen-nitrogen co-diffusion device of the present invention;

[0022] Figure 3 It is a schematic diagram of a servo motor of a brake disc oxygen-nitrogen co-diffusion device of the present invention;

[0023] Figure 4 It is a schematic diagram of a tooth plate of a brake disc oxygen-nitrogen co-diffusion device of the present invention;

[0024] Figure 5 It is a cross-sectional view of the rotating shaft of a brake disc oxygen-nitrogen co-diffusion device of the present invention;

[0025] Figure 6 It is a schematic diagram of a jetting disc of a brake disc oxygen-nitrogen co-diffusion device of the present invention;

[0026] Figure 7 A cross-sectional view of a guide plate of an oxygen-nitrogen co-diffusion device for a brake disc according to the present invention;

[0027] Figure 8 This is a schematic diagram of a plate frame of an oxygen-nitrogen co-diffusion device for a brake disc of the present invention.

[0028] In the figure: 1. heating furnace; 2. furnace door; 3. air inlet pipe; 4. guide plate; 5. air distribution pipe; 6. air duct; 7. jet disc; 8. servo motor; 9. extension frame; 10. air guide pipe; 11. motor seat; 12. piston; 13. connecting frame; 14. push column; 15. rotating ear; 16. push plug frame; 17. frame ear; 18. fixed frame; 19. T-shaped guide seat; 20. T-shaped guide groove; 21. tooth plate; 22. rotating shaft; 23. gear; 24. top frame; 25. air collecting pipe; 26. air inlet; 27. connecting plate; 28. plate frame; 29. ​​centering column; 30. paddle; 31. air blocking plate; 32. air blocking ring; 33. air outlet; 34. brake disc; 35. pipe rack. DETAILED DESCRIPTION

[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0030] like Figure 1-Figure 8A brake disc oxygen-nitrogen co-diffusion device shown in the figure includes a heating furnace 1, an air intake pipe 3 is embedded through the front edge of the side of the heating furnace 1, the air intake pipe 3 plays a role in introducing gas into the heating furnace 1, the end of the air intake pipe 3 is fixedly connected with an air distribution pipe 5, and the outer surface of the air distribution pipe 5 is fixedly connected with a plurality of groups of air ducts 6 in a linear array, the air distribution pipe 5 and the air duct 6 play a role in introducing gas into the jet disk 7, the number of each group of air ducts 6 is two, the ends of the two air ducts 6 are fixedly connected with the jet disk 7, and the opposite surfaces of the two jet disks 7 are penetrated by a plurality of air outlet holes 33 in a circular array, which can ensure that the gas is fully and evenly guided to the surface of the brake disc 34 to reduce gas waste, and a heat conductive part is installed on the air intake pipe 3, and a mixing part is installed on the lower part of the side of the heating furnace 1, and the mixing part is connected to the air intake pipe 3.

[0031] A furnace door 2 is installed at the front end of the heating furnace 1, and the furnace door 2 serves to seal the heating furnace 1. A plurality of sheet frames 28 are fixedly installed in a linear array at the rear end of the heating furnace 1. The sheet frames 28 extend between the two jet discs 7. A centering column 29 is inlaid at the front end of the sheet frame 28. The sheet frame 28 serves to support the centering column 29. The center line of the centering column 29 is colinear with the center line of the jet disc 7. The centering column 29 serves to position the brake disc 34 in the middle area between the two jet discs 7. The internal linear array of the sheet frame 28 is inlaid with a plurality of connecting sheets 27. The connecting sheets 27 serve to strengthen the bearing capacity of the sheet frame 28. The sheet design of the sheet frame 28 and the connecting sheets 27 can avoid obstruction of the gas ejected from the air outlet 33.

[0032] The heat conducting member comprises a plurality of guide vanes 4 fixedly mounted in a linear array on the upper end of the air inlet pipe 3, the guide vanes 4 extending into the interior of the air inlet pipe 3, the guide vanes 4 being located in the heating furnace 1, the guide vanes 4 playing a role of heat conduction, the inner linear array of the air inlet pipe 3 is coaxially inlaid with a plurality of air blocking rings 32, the inner linear array of the air inlet pipe 3 is coaxially provided with a plurality of air blocking sheets 31, the air blocking rings 32 and the air blocking sheets 31 play a role of increasing the contact surface with the gas, the air blocking sheets 31 and the air blocking rings 32 are staggered, a gap is left between the air blocking sheets 31 and the inner wall of the air inlet pipe 3, the gas can continuously pass through the pores of the air blocking rings 32 and the gap between the air blocking sheets 31 and the air inlet pipe 3 in sequence, thereby delaying the time for the gas to pass through, the upper end of the air blocking sheet 31 and the upper end of the air blocking ring 32 are fixed to the guide vanes 4.

[0033] The gas mixing component includes an extension frame 9 fixedly installed on the lower side of the heating furnace 1, and a pipe rack 35 is fixedly installed on the upper end of the extension frame 9. Air guide pipes 10 are fixedly installed at both ends of the pipe rack 35. The extension frame 9 and the pipe rack 35 play a role in supporting the air guide pipe 10. The front end side of the front air guide pipe 10 is fixedly connected to the air inlet pipe 3, and the air guide pipe 10 plays a role in guiding air. One end of the rear air guide pipe 10 is fixedly connected to the air gathering pipe 25. The side linear array of the air gathering pipe 25 is provided with three air inlets 26. The air inlet 26 plays a role in providing nitrogen, ammonia and air. The air gathering pipe 25 plays a role in premixing the three gases, nitrogen, ammonia and air.

[0034] One side of the front end of the rear air duct 10 is fixedly connected to the other side of the rear end of the front air duct 10, and a piston 12 is slidably installed through one end of the front air duct 10 and the other end of the rear air duct 10. The piston 12 can continuously block and open the air outlet of the air duct 10 to delay the passage of gas. Push columns 14 are coaxially extended on the sides of the two pistons 12. The push columns 14 play a role in pushing the pistons 12. A connecting frame 13 is embedded between the ends of the two push columns 14. The connecting frame 13 plays a role in fixing the two push columns 14 together.

[0035] A motor seat 11 is fixedly installed at the rear end of the extension frame 9, and a servo motor 8 is fixedly installed at the upper end of the motor seat 11. The motor seat 11 plays a role in fixing the servo motor 8. A rotating ear 15 is extended from the output end of the servo motor 8. A plug pusher frame 16 is rotatably installed at the end of the rotating ear 15. The rotating ear 15 plays a role in driving the plug pusher frame 16 to move. The end of the plug pusher frame 16 is rotatably connected to the connecting frame 13, and the plug pusher frame 16 plays a role in pushing the connecting frame 13. The upper ends of the two air guide tubes 10 are slidably installed with tooth plates 21, and the ends of the tooth plates 21 are fixedly installed with a top frame 24. The top frame 24 plays a role in fixing the tooth plates 21 and the piston 12 together. The end is fixed to the piston 12, and the servo motor 8 drives the pusher frame 16 to move through the rotating ear 15 to push the tooth plate 21, so that the tooth plate 21 continuously moves back and forth under the guidance of the T-shaped guide seat 19, thereby driving the gear 23 to rotate, so that the paddle 30 on the rotating shaft 22 can continuously reciprocate to stir the three gases in the air duct 10 and mix them evenly. During this process, the pusher frame 16 will also continuously drive the piston 12 to slide in the air duct 10 to continuously block or open the air outlet of the air duct 10 to delay the time for the gas to pass through the air duct 10, that is, to extend the stirring time of the gas to further promote its even mixing.

[0036] Two rotating shafts 22 are symmetrically installed inside the air guide tube 10. The upper end of the rotating shaft 22 passes through the upper end of the air guide tube 10. The rotating shaft 22 plays the role of carrying the paddle 30. The upper end of the rotating shaft 22 is coaxially inlaid with a gear 23. The gear 23 is meshed with the tooth plate 21. The gear 23 and the tooth plate 21 play the role of allowing the rotating shaft 22 to reciprocate. A plurality of paddles 30 are fixedly installed in an annular array on the outer surface of the rotating shaft 22. The paddles 30 play the role of mixing the three gases of nitrogen, ammonia and air. The front end of the toothed plate 21 is provided with a T-shaped guide groove 20, and a T-shaped guide seat 19 is fitted inside the T-shaped guide groove 20. The T-shaped guide groove 20 and the T-shaped guide seat 19 guide the toothed plate 21. The front end of the T-shaped guide seat 19 is inlaid with a fixed frame 18, and two frame ears 17 extend symmetrically from the lower end of the fixed frame 18. The fixed frame 18 fixes the T-shaped guide seat 19, and the end of the frame ear 17 is fixed to the air guide pipe 10, and the frame ear 17 fixes the fixed frame 18.

[0037] A brake disc oxy-nitrogen co-diffusion process is also provided, comprising the following steps:

[0038] S1: The center hole sleeve of the brake disc 34 is placed on the centering column 29 and supported by the film frame 28, so that the brake disc 34 is located between the two jet discs 7. Then the heating furnace 1 is heated to 350 degrees and maintained at this temperature for 30 minutes. During this process, only nitrogen is introduced through the air inlet 26 for nitriding;

[0039] S2: The heating furnace 1 is then heated to 450-500 degrees and maintained at this temperature for 120 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet 26 to achieve oxygen-nitrogen co-penetration, so that the surface of the brake disc 34 quickly absorbs nitrogen atoms and forms diffusely distributed nitrides;

[0040] S3: The heating furnace 1 is then heated to 520-550 degrees and maintained at this temperature for 360 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet 26 to accelerate the diffusion of nitrogen in the brake disc 34 and increase the depth of the nitriding layer. At the same time, the infiltrated oxygen and Fe form a porous Fe3O4 layer.

[0041] When in use, the center hole sleeve of the brake disc 34 is placed on the centering column 29 and supported by the sheet frame 28, so that the brake disc 34 is located between the two jet discs 7. Then the heating furnace 1 is heated to 350 degrees and maintained at this temperature for 30 minutes. During this process, only nitrogen is introduced through the air inlet 26, so that the nitrogen is evenly and fully guided to the surface of the brake disc 34 through the air outlet 33 on the jet disc 7 for nitriding, so that the brake disc 34 is stepped in the furnace to effectively reduce the dimensional deformation during the nitriding process. At the same time, it can also purify the product surface, improve the chemical activity of the workpiece surface, and increase the depth of the nitriding layer, thereby improving the hardness, wear resistance and corrosion resistance of the workpiece. Then the heating furnace 1 is heated to 450- 500 degrees, and keep it at this temperature for 120 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet 26. When nitrogen, ammonia and air enter the air duct 10 through the three air inlets 26 respectively, the servo motor 8 will work to drive the push plug rack 16 to move through the rotating ear 15 to push the tooth plate 21, so that the tooth plate 21 continuously moves back and forth under the guidance of the T-shaped guide seat 19, thereby driving the gear 23 to rotate, so that the paddle 30 on the rotating shaft 22 can continuously reciprocate to stir the three gases in the air duct 10 and mix them evenly. In this process, the push plug rack 16 will also continuously drive the piston 12 to slide in the air duct 10 to continuously push the air duct 10. The gas outlet of the pipe 10 is blocked or opened to delay the time for the gas to pass through the air guide pipe 10, that is, to extend the stirring time of the gas to further promote its uniform mixing. The mixed gas enters another air guide pipe 10 for secondary mixing and is then discharged into the air inlet pipe 3. At this time, the guide plate 4 and the air blocking plate 31 and the air blocking ring 32 will absorb the heat in the heating furnace 1 and conduct it to the gas in the air inlet pipe 3 to increase the contact area between the gas and the heat, so that the gas is preheated. At the same time, when the gas passes through the pores on the multiple air blocking rings 32 and the gaps between the multiple air blocking plates 31 and the air inlet pipe 3 in sequence, the time for the gas to pass can be delayed, so that the gas is fully preheated, and the preheated mixed gas is again The air is evenly and fully directed to the surface of the brake disc 34 through the outlet holes 33 on the jet disc 7 to achieve oxygen-nitrogen co-diffusion. The surface of the brake disc 34 quickly absorbs nitrogen atoms and forms diffusely distributed nitrides, which effectively improves the surface hardness of the brake disc 34. The heating furnace 1 is then heated to 520-550 degrees and maintained at this temperature for 360 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet 26. Due to the high nitriding temperature, the diffusion of nitrogen in the brake disc 34 is accelerated, and the depth of the nitriding layer is increased. At the same time, the infiltrated oxygen and Fe form a porous Fe3O4 layer, generally 2-4μm, to improve the heat dissipation and anti-adhesion performance of the brake disc 34. After oxygen-nitrogen co-diffusion, the product presents a uniform grayish white color.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A brake disc oxy-nitrogen co-diffusion device, comprising a heating furnace (1), characterized in that: An air intake pipe (3) is embedded through the front edge of the side of the heating furnace (1), the end of the air intake pipe (3) is fixedly connected to an air distribution pipe (5), the outer surface of the air distribution pipe (5) is fixedly connected to multiple groups of air bleed pipes (6) in a linear array, each group of the air bleed pipes (6) has two, the ends of the two air bleed pipes (6) are fixedly connected to an injection disk (7), the opposite surfaces of the two injection disks (7) are both penetrated by a plurality of air outlet holes (33) in a circular array, a heat conducting part is installed on the air intake pipe (3), and a gas mixing part is installed on the lower part of the side of the heating furnace (1), and the gas mixing part is connected to the air intake pipe (3); A furnace door (2) is installed at the front end of the heating furnace (1); a plurality of sheet frames (28) are fixedly installed in a linear array at the rear end of the heating furnace (1); the sheet frames (28) extend between two air jet disks (7); a centering column (29) is inlaid at the front end of the sheet frame (28); the center line of the centering column (29) is colinear with the center line of the air jet disk (7); and a plurality of connecting sheets (27) are inlaid in a linear array inside the sheet frame (28); The heat conducting member comprises a plurality of guide vanes (4) fixedly mounted in a linear array on the upper end of the air intake pipe (3), the guide vanes (4) extending into the interior of the air intake pipe (3), the guide vanes (4) being located in the heating furnace (1), the interior linear array of the air intake pipe (3) being coaxially inlaid with a plurality of air blocking rings (32), the interior linear array of the air intake pipe (3) being coaxially arranged with a plurality of air blocking vanes (31), the air blocking vanes (31) and the air blocking rings (32) being staggered, a gap being left between the air blocking vanes (31) and the inner wall of the air intake pipe (3), the upper ends of the air blocking vanes (31) and the upper ends of the air blocking rings (32) being fixed to the guide vanes (4); The gas mixing element comprises a protruding frame (9) fixedly mounted on the lower side of the heating furnace (1), a pipe rack (35) fixedly mounted on the upper end of the protruding frame (9), an air guide pipe (10) fixedly mounted on both ends of the pipe rack (35), a front end side of the front air guide pipe (10) fixedly connected to an air inlet pipe (3), and one end of the rear air guide pipe (10) fixedly connected to an air gathering pipe (25), and three air inlets (26) are arranged in a linear array on the side of the air gathering pipe (25); One side of the front end of the rear air guide tube (10) is fixedly connected to the other side of the rear end of the front air guide tube (10); one end of the front air guide tube (10) and the other end of the rear air guide tube (10) are both penetrated by a piston (12) slidably mounted thereon; push columns (14) are coaxially extended from the sides of the two pistons (12); a connecting frame (13) is embedded between the ends of the two push columns (14); A motor seat (11) is fixedly mounted on the rear end of the extension frame (9), a servo motor (8) is fixedly mounted on the upper end of the motor seat (11), a rotating ear (15) is extended from the output end of the servo motor (8), a plug pusher frame (16) is rotatably mounted on the end of the rotating ear (15), the end of the plug pusher frame (16) is rotatably connected to the connecting frame (13), a tooth plate (21) is slidably mounted on the upper ends of the two air guide tubes (10), a top frame (24) is fixedly mounted on the end of the tooth plate (21), and the end of the top frame (24) is fixed to the piston (12); Two rotating shafts (22) are symmetrically mounted inside the air guide tube (10), the upper ends of the rotating shafts (22) penetrate through the upper end of the air guide tube (10), the upper ends of the rotating shafts (22) are coaxially inlaid with gears (23), the gears (23) are meshed with the toothed plate (21), a plurality of paddles (30) are fixedly mounted in an annular array on the outer surface of the rotating shaft (22), a T-shaped guide groove (20) is formed at the front end of the toothed plate (21), a T-shaped guide seat (19) is fitted inside the T-shaped guide groove (20), a fixed frame (18) is inlaid at the front end of the T-shaped guide seat (19), two frame ears (17) are symmetrically extended from the lower end of the fixed frame (18), and the ends of the frame ears (17) are fixed to the air guide tube (10).

2. A brake disc oxy-nitrogen pyrolysis process, used in a brake disc oxy-nitrogen pyrolysis device as claimed in claim 1, characterized in that: The following steps are involved: S1: The center hole sleeve of the brake disc (34) is placed on the centering column (29) and supported by the sheet frame (28) so that the brake disc (34) is located between the two jet discs (7). Then the heating furnace (1) is operated to heat to 350 degrees and maintained at this temperature for 30 minutes. During this process, only nitrogen is introduced through the air inlet (26) for nitriding; S2: The heating furnace (1) is then heated to 450-500 degrees and maintained at this temperature for 120 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet (26) to achieve oxygen-nitrogen co-diffusion, so that the surface of the brake disc (34) quickly absorbs nitrogen atoms and forms dispersed nitrides; S3: The heating furnace (1) is then heated to 520-550 degrees and maintained at this temperature for 360 minutes. During this process, nitrogen, ammonia and air are introduced through the air inlet (26) to accelerate the diffusion of nitrogen in the brake disc (34) and increase the depth of the nitriding layer. At the same time, the infiltrated oxygen and Fe form a porous Fe3O4 layer.

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