A nitriding furnace

Abstract

The utility model provides a kind of nitriding furnace, it is related to metal nitriding technical field, comprising: main bore body, its bore inner bottom surface coaxially rotationally connected with rotating pipe, rotating pipe upper end is closed arrangement, rotating pipe side wall is penetrated with multiple first air holes, rotating pipe lower end surface is penetrated with multiple second air holes, second air hole is communicated to the bore outer bottom surface of main bore body;Auxiliary bore body, its upper end is open arrangement and is coaxially connected on the bore outer bottom surface of main bore body, the bottom surface of main bore body between the side wall of auxiliary bore body and rotating pipe is penetrated with multiple third air holes, and the lower end of auxiliary bore body is communicated with two first air ports;Annular heating furnace, coaxially set in the circumferential side of auxiliary bore body, and the heating port of annular heating furnace is set towards the lower end of main bore body and the side wall of auxiliary bore body.The utility model can improve the nitriding effect of alloy material, and has strong practicality.

Description

Technical Field

[0001] This application relates to the field of metal nitriding technology, specifically to a nitriding furnace. Background Technology

[0002] Nitriding of metals is a surface chemical heat treatment process that introduces nitrogen atoms into the metal surface at a specific temperature, forming a nitride layer with high hardness, high wear resistance, and high fatigue resistance, thereby significantly improving the surface properties of metal parts. The specific process of nitriding generally involves placing the alloy material to be nitrided in a nitrogen-rich environment and holding it at a high temperature for a certain period. Nitrogen atoms diffuse from the surface of the alloy material inwards, combining with alloying elements to form fine, dispersed, high-hardness nitrides. Currently, nitriding furnaces and ammonia gas are commonly used to nitrid the alloy materials. However, existing nitriding furnaces suffer from uneven atmosphere distribution and poor temperature control, resulting in poor nitriding effects. Utility Model Content

[0003] To address the aforementioned deficiencies in the prior art, this application provides a nitriding furnace that can improve the nitriding effect of alloy materials and has strong practicality.

[0004] To achieve the above objectives, this utility model employs the following technology. A nitriding furnace, comprising: The main bore has a rotating tube coaxially rotatably connected to its inner bottom surface. The upper end of the rotating tube is closed, and multiple first vent holes are penetrating through the side wall of the rotating tube. Multiple second vent holes are penetrating through the lower end surface of the rotating tube, and the second vent holes are connected to the outer bottom surface of the main bore. The secondary bore has an open upper end and is coaxially connected to the bottom surface of the main bore. The bottom surface of the main bore, located between the side wall of the secondary bore and the rotating tube, has multiple third vent holes. The lower end of the secondary bore is connected to two first vent ports. The annular heating furnace is coaxially arranged around the secondary chamber, with the heating port of the annular heating furnace facing the lower end of the main chamber and the side wall of the secondary chamber.

[0005] Furthermore, the upper end of the main bore is open and fitted with a bore cover, and the fit between the upper end of the main bore and the bore cover is airtight. The bore cover is connected to a second vent.

[0006] Furthermore, it also includes a support frame located below the main chamber, with the annular heating furnace mounted on the support frame, and an mounting bracket on the support frame, with the main chamber mounted on the mounting bracket.

[0007] Furthermore, a rotating mechanism is provided below the support frame, and the drive shaft of the rotating mechanism passes through the lower end of the secondary bore and is coaxially connected to the lower end face of the rotating tube.

[0008] Furthermore, a bearing ring is coaxially provided on the side wall of the rotating tube, and an annular disk is coaxially movable above the bearing ring. The inner annular surface of the annular disk slides in contact with the side wall of the rotating tube, and the outer annular surface of the annular disk slides in contact with the inner wall of the main chamber. Multiple fourth vent holes are penetrating the annular disk. A portal-shaped rod is connected to the upper surface of the annular disk. One end of each of the two vertical sections of the portal-shaped rod is connected to the upper surface of the annular disk, and the two ends of the horizontal section of the portal-shaped rod are perpendicularly connected to the other ends of the two vertical sections, respectively.

[0009] The beneficial effects of this utility model are as follows: The ammonia gas is preheated by the auxiliary chamber, which prevents the main chamber from losing temperature due to the entry of new gas and improves the nitriding effect. Secondly, by setting a third vent hole and a second vent hole on the rotating tube, the ammonia gas can be evenly diffused in the main chamber, which further improves the nitriding effect. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of a nitriding furnace according to an embodiment of this application.

[0011] Figure 2 This is a cross-sectional schematic diagram of the main bore and the auxiliary bore in an embodiment of this application.

[0012] Figure 3 This is a cross-sectional schematic diagram of the main chamber and the cover according to an embodiment of this application.

[0013] The markings in the diagram are: 1-Main chamber, 11-Rotating tube, 12-First vent, 13-Second vent, 14-Third vent, 15-Burning cover, 16-Second vent, 17-Bearing ring, 18-Annular disc, 19-Fourth vent, 110-Gantry rod, 2-Secondary chamber, 21-First vent, 3-Annular heating furnace, 4-Bearing frame, 41-Mounting frame, 42-Rotating mechanism. Detailed Implementation

[0014] To make the objectives, technical solutions and advantages of the present utility model clearer, the implementation methods of the present utility model will be described in detail below with reference to the accompanying drawings. However, the embodiments described in the present utility model are only some embodiments of the present utility model, and not all embodiments.

[0015] like Figure 1 As shown, this embodiment provides a nitriding furnace, including a main chamber 1, a secondary chamber 2, and an annular heating furnace 3.

[0016] Specifically, such as Figure 2As shown, the main chamber 1 is a cylindrical chamber with a rotating tube 11 coaxially rotatably connected to its inner bottom surface. The upper end of the rotating tube 11 is closed, and multiple first vent holes 12 are passed through the side wall of the rotating tube 11. Multiple second vent holes 13 are passed through the lower end surface of the rotating tube 11, and the second vent holes 13 are connected to the outer bottom surface of the main chamber 1.

[0017] Specifically, such as Figure 2 As shown, the auxiliary chamber 2 is a cylindrical compartment with its upper end open and coaxially connected to the bottom surface of the main chamber 1. The bottom surface of the main chamber 1, located between the side wall of the auxiliary chamber 2 and the rotating tube 11, has multiple third vent holes 14. The lower end of the auxiliary chamber 2 is connected to two first vent ports 21, which are respectively connected to different gas control mechanisms in the outside to control the flow of ammonia and air in the auxiliary chamber.

[0018] Specifically, such as Figure 2 As shown, the annular heating furnace 3 is coaxially arranged around the secondary chamber 2. The heating port of the annular heating furnace 3 is arranged facing the lower end of the main chamber 1 and the side wall of the secondary chamber 2, and is used to heat the lower end of the main chamber 1 and the side wall of the secondary chamber 2.

[0019] During operation, the alloy material to be nitrided is placed into the main chamber 1, then the main chamber 1 is closed, and the annular heating furnace 3 is opened. Ammonia gas is first introduced into the auxiliary chamber 1 through one of the first vent ports 21. The ammonia gas is preheated in the auxiliary chamber 1. After being preheated to a certain temperature, it enters the rotating tube 11 through the second vent port 13 and diffuses into the main chamber 1 through the first vent port 12 to nitrid the alloy material. With this design, under the heating of the annular heating furnace, the ammonia gas will be preheated in the auxiliary chamber 2 first, avoiding the ammonia gas from being too cold when it enters the main chamber 1 and affecting the atmosphere temperature in the main chamber 1. This improves the heat preservation effect of the main chamber 1 and enhances the nitriding effect.

[0020] Secondly, the rotating tube 11 can rotate, allowing ammonia gas to diffuse more evenly from the rotating tube 11 into the main chamber 1, so that each alloy material can come into contact with an equal amount of ammonia gas, further improving the nitriding effect.

[0021] Furthermore, the bottom surface of the main chamber 1, located between the side wall of the auxiliary chamber 2 and the rotating tube 11, has multiple third vent holes 14, which can prevent ammonia from depositing at the bottom of the main chamber and causing the ammonia concentration to be low at the top and high at the bottom, thus further improving the nitriding effect.

[0022] Preferred, such as Figure 3As shown, the upper end of the main chamber 1 is open and fitted with a chamber cover 15. The fit between the upper end of the main chamber 1 and the chamber cover 15 is airtight, that is, the fit between the chamber cover 15 and the upper end of the main chamber 1 can be achieved by means of threaded fit or other airtight fitting methods. The chamber cover 15 is connected to a second vent 16, which is used to connect with an external waste gas treatment mechanism. With this design, since ammonia decomposes into hydrogen during the nitriding process, and hydrogen is prone to accumulate at the upper end of the main chamber 1 due to its low density, the second vent 16 is provided here so that the hydrogen accumulated at the upper end of the main chamber 1 can be discharged from the second vent 16, thereby improving the safety of the nitriding furnace.

[0023] Preferred, such as Figure 1 As shown, the nitriding furnace also includes a support frame 4 located below the main chamber 1, an annular heating furnace 3 is located on the support frame 4, and a mounting frame 41 is provided on the support frame 4. The main chamber 1 is mounted on the mounting frame 41, and the support frame 4 is used to fix the main chamber 1 on the horizontal plane.

[0024] Preferred, such as Figure 2 As shown, a rotating mechanism 42 is provided below the support frame 4. The rotating mechanism 42 can be a mechanical drive mechanism such as a rotating cylinder or a rotary motor. The drive shaft of the rotating mechanism 42 passes through the lower end of the auxiliary chamber 2 and is coaxially connected to the lower end face of the rotating tube 11. More preferably, the lower end of the auxiliary chamber 2 should be provided with an opening for rotating cooperation with the drive shaft of the rotating mechanism 42, and the contact surface between the drive shaft of the rotating mechanism 42 and the opening should be airtight to prevent the gas in the auxiliary chamber 2 from diffusing to the outside. The rotating mechanism 42 is used to drive the rotating tube 11 to rotate.

[0025] Preferred, such as Figure 2 and Figure 3 As shown, a bearing ring 17 is coaxially provided on the side wall of the rotating tube 11, and an annular disk 18 is coaxially movable above the bearing ring 17. The inner annular surface of the annular disk 18 slides in contact with the side wall of the rotating tube 11, and the outer annular surface of the annular disk 18 slides in contact with the inner wall of the main bore 1. Multiple fourth vent holes 19 are penetrating the annular disk 18. A portal rod 110 is connected to the upper surface of the annular disk 18. One end of each of the two vertical sections of the portal rod 110 is connected to the upper surface of the annular disk 18, and the two ends of the horizontal section of the portal rod 110 are perpendicularly connected to the other ends of the two vertical sections, respectively. With this design, alloy materials can be easily placed or removed in the main bore 1 by manually holding the horizontal section of the portal rod 110. Secondly, this design can avoid the alloy material from directly contacting the bottom surface of the main bore 1, which would cause the alloy material temperature to be too high and affect the nitriding effect.

[0026] The above description is only a preferred embodiment of this application and is not intended to limit this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application.

Claims

1. A nitriding furnace, characterized in that, include: The main bore (1) has a rotating tube (11) coaxially rotatably connected to its inner bottom surface. The upper end of the rotating tube (11) is closed. Multiple first vent holes (12) are passed through the side wall of the rotating tube (11). Multiple second vent holes (13) are passed through the lower end surface of the rotating tube (11). The second vent holes (13) are connected to the outer bottom surface of the main bore (1). The auxiliary bore (2) is open at its upper end and coaxially connected to the bottom surface of the main bore (1). The bottom surface of the main bore (1) located between the side wall of the auxiliary bore (2) and the rotating tube (11) has multiple third vent holes (14). The lower end of the auxiliary bore (2) is connected to two first vent ports (21). The annular heating furnace (3) is coaxially arranged around the secondary chamber (2), with the heating port of the annular heating furnace (3) facing the lower end of the main chamber (1) and the side wall of the secondary chamber (2).

2. The nitriding furnace according to claim 1, characterized in that, The upper end of the main bore (1) is open and fitted with a bore cover (15). The fit between the upper end of the main bore (1) and the bore cover (15) is airtight. The bore cover (15) is connected to a second vent (16).

3. The nitriding furnace according to claim 1, characterized in that, It also includes a support frame (4) located below the main chamber (1), an annular heating furnace (3) is located on the support frame (4), and a mounting frame (41) is provided on the support frame (4), and the main chamber (1) is mounted on the mounting frame (41).

4. The nitriding furnace according to claim 1, characterized in that, A rotating mechanism (42) is provided below the support frame (4). The drive shaft of the rotating mechanism (42) passes through the lower end of the secondary bore (2) and is coaxially connected to the lower end face of the rotating tube (11).

5. The nitriding furnace according to claim 1, characterized in that, A bearing ring (17) is coaxially provided on the side wall of the rotating tube (11). An annular disk (18) is coaxially movable above the bearing ring (17). The inner annular surface of the annular disk (18) slides in contact with the side wall of the rotating tube (11), and the outer annular surface of the annular disk (18) slides in contact with the inner wall of the main chamber (1). Multiple fourth vent holes (19) are penetrating the annular disk (18). A portal rod (110) is connected to the upper surface of the annular disk (18). One end of each of the two vertical sections of the portal rod (110) is connected to the upper surface of the annular disk (18), and the two ends of the horizontal section of the portal rod (110) are perpendicularly connected to the other ends of the two vertical sections respectively.

Images