Efficient carbonitriding equipment

Abstract

The utility model relates to the field of carbonitriding treatment equipment, in particular to efficient carbonitriding equipment. The equipment comprises a heating furnace, a first gas inlet pipe, a second gas inlet pipe, a mixing pipe and a fan, one end of the first gas inlet pipe and one end of the second gas inlet pipe extend into the heating furnace, the mixing pipe is located in the heating furnace and provided with two communicating ports connected with the first gas inlet pipe and the second gas inlet pipe respectively, and the fan is used for driving gas in the heating furnace to flow. And two fans which are symmetrically arranged relative to the center of the heating furnace are arranged. In addition, the equipment further comprises a base plate and a frame body which are used for containing materials, and through grooves are formed in the base plate and the frame body to promote gas circulation. By optimizing the gas distribution and improving the mass transfer efficiency, the technical effect of remarkably improving the carbonitriding treatment speed and uniformity is achieved.

Description

Technical Field

[0001] This application relates to the field of carbonitriding treatment equipment, and in particular to a high-efficiency carbonitriding equipment. Background Technology

[0002] Carbonitriding technology is widely used to improve the performance of bearing races, especially when there is a significant difference between domestically produced and imported bearing steels. Carbonitriding can significantly improve bearing life and reliability. This process mainly involves infiltrating carbon and nitrogen elements into the surface of the bearing races under high-temperature conditions, thereby enhancing their wear resistance and fatigue resistance. With increasing market demand and technological advancements, carbonitriding has become one of the important means to improve product quality and reduce costs.

[0003] Reference Figure 1 In practical applications, to achieve the carbonitriding process, bearing rings are typically placed in a specific loading container and then heat-treated in a furnace. Existing loading containers mainly consist of iron drums made of high-temperature resistant materials. Some of these drums have through holes in their bases to allow gas to enter and contact the bearing rings. During operation, the bearing rings are placed in the iron drum and then lifted into the furnace using lifting lugs. Furthermore, CO2 and NH3 gases are introduced into the furnace. The gases are injected from the bottom of the furnace, flow upwards through a guide tube, and are evenly distributed by an upper fan.

[0004] However, this traditional loading device and heating method has significant drawbacks. Because the gas cannot simultaneously and evenly penetrate the surface of each ring, the penetration layer near the guide tube is deeper, while the penetration layer near the iron barrel wall is shallower, resulting in inconsistent penetration layer thickness across different locations. Consequently, this not only affects grinding efficiency and precision consistency but also increases the difficulty and cost of subsequent processing. Therefore, a new loading device and heating device are urgently needed to solve these problems and ensure uniformity and efficiency in the carbonitriding process. Utility Model Content

[0005] To improve the uniformity of the carbonitriding process, this application provides a high-efficiency carbonitriding device.

[0006] The high-efficiency carbonitriding equipment provided in this application adopts the following technical solution:

[0007] A high-efficiency carbonitriding device includes a heating furnace, a first inlet pipe, a second inlet pipe, a mixing pipe, and a fan.

[0008] One end of the first air inlet pipe extends into the heating furnace.

[0009] One end of the second air inlet pipe extends into the heating furnace.

[0010] The mixing tube is located inside the heating furnace and has two connecting ports and at least one outlet. The two connecting ports are respectively connected to a first air inlet pipe and a second air inlet pipe.

[0011] The fan is used to drive the gas flow inside the heating furnace. There are two fans, which are symmetrically arranged about the center of the heating furnace.

[0012] By adopting the above technical solution, the mixing pipe can fully mix the gases input from the first and second inlet pipes before releasing them into the heating furnace, ensuring a uniform distribution of gas composition. The symmetrical arrangement of the two fans effectively promotes rapid gas flow within the heating furnace, further improving gas penetration efficiency, thereby achieving a more uniform carbonitriding effect and enhancing product quality and consistency.

[0013] Preferably, the mixing tube is located between the two fans.

[0014] By adopting the above technical solution, the mixing tube is located between the two fans, ensuring uniform gas distribution within the heating furnace. Specifically, after the mixed gas flows out of the mixing tube, it is accelerated by the combined action of the upper and lower fans, increasing the flow speed and range of the gas throughout the heating furnace, thereby improving the efficiency and uniformity of gas penetration into the material. This not only reduces the carbonitriding time but also significantly improves the consistency of the penetration layer for each material (bearing ring), enhancing the efficiency and precision of subsequent grinding processes.

[0015] Preferably, the two fans are located at the top and bottom of the heating furnace, respectively.

[0016] By adopting the above technical solution, with fans located at the top and bottom of the heating furnace, rapid gas flow is promoted throughout the furnace, ensuring uniform gas penetration into the material from both top and bottom directions, significantly improving the uniformity and efficiency of carbonitriding. This not only reduces the difference in diffusion layers between different locations of the material but also improves grinding efficiency, dimensional accuracy, and precision consistency.

[0017] Preferably, it includes a chassis and a frame.

[0018] The chassis is used to be placed inside the heating furnace.

[0019] The frame is cylindrical and is connected to the chassis.

[0020] The frame is used to place materials.

[0021] Both the chassis and the frame are provided with through slots.

[0022] By adopting the above technical solution, the design of the chassis and frame allows gas to permeate evenly into the material from multiple directions, improving the uniformity of carbonitriding. Specifically:

[0023] Both the chassis and the frame are equipped with through slots, which ensures that gas can enter the material area from the center and the sides at the same time, reducing the difference in seepage layer thickness caused by uneven local airflow.

[0024] The cylindrical design of the frame increases the loading capacity and also facilitates hoisting operations, thereby improving production efficiency.

[0025] This design simplifies the manufacturing process, avoids the complex steps of drilling holes in the barrel wall required by traditional iron barrels, and reduces production costs.

[0026] Preferably, the chassis includes a bottom ring, main steel reinforcement, and support legs.

[0027] The main reinforcing bars are connected inside the bottom ring. Multiple main reinforcing bars are provided, and the through grooves of the base are formed between adjacent main reinforcing bars.

[0028] The support legs are connected to the bottom ring or the main steel reinforcement.

[0029] By adopting the above technical solution, the chassis has good air permeability, allowing gas to smoothly enter the interior of the loading container from the through-slot, ensuring that each material can fully contact the gas, thereby improving the uniformity and efficiency of carbonitriding. At the same time, the support legs help support the entire loading container, placing it stably inside the heating furnace and avoiding the problem of uneven gas distribution caused by the limited number of openings at the bottom of traditional iron drums.

[0030] Preferably, the chassis further includes reinforcing ribs.

[0031] The reinforcing rib is connected to multiple main reinforcing bars, and the reinforcing rib is connected to the bottom ring.

[0032] By adopting the above technical solutions, the overall strength and stability of the chassis are improved, ensuring that it will not deform in high-temperature environments, thereby guaranteeing the reliability and service life of the loading equipment.

[0033] Preferably, the frame includes a surrounding ring and heat-resistant reinforcing bars.

[0034] There are two enclosures.

[0035] One end of the heat-resistant steel bar is connected to one of the surrounding rings, and the other end of the heat-resistant steel bar is connected to another surrounding ring. The heat-resistant steel bar is provided in multiple ways, and the through groove of the frame is formed between adjacent heat-resistant steel bars.

[0036] By adopting the above technical solution, the structural design of the frame allows the through grooves between the heat-resistant steel bars to effectively increase the gas flow area, ensuring that gas permeates into the material uniformly from the center and circumference, thus improving the uniformity and efficiency of carbonitriding. Furthermore, this design simplifies the manufacturing process, facilitates small-batch, multi-specification production, and reduces production costs.

[0037] Preferably, the frame further includes lifting lugs.

[0038] The lug is provided with a slot, which extends through the lug along the axial direction of the ring.

[0039] By adopting the above technical solution, it is not only convenient to hoist the loading equipment into and out of the heating furnace, but it can also serve as a slot for the support legs of the upper layer of loading equipment when multiple layers are stacked, ensuring the stability and positioning accuracy of the loading equipment in the heating furnace, thereby further improving the uniformity and processing efficiency of carbonitriding.

[0040] Preferably, it includes a flow guide tube.

[0041] The guide tube is connected to the chassis, and the outside of the guide tube and the inside of the frame are used to place materials. The guide tube is provided with the through groove.

[0042] By adopting the above technical solution, the gas can be more evenly distributed throughout the heating space, thereby improving the uniformity and efficiency of carbonitriding. Specifically,

[0043] Uniform gas distribution: The grooves on the guide tube help the gas diffuse from the center to the surroundings, while also allowing the gas to permeate from the periphery to the center, ensuring that every material can fully contact the gas and reducing the problem of uneven local permeation depth;

[0044] Improved uniformity of the infiltration layer: Since gas can enter the material from multiple directions, the difference in infiltration layer thickness between different materials is significantly reduced, improving the dimensional accuracy and consistency after grinding;

[0045] Enhanced process stability: The design of the guide tube enhances the stability and reliability of the entire system, avoids the uneven gas distribution problem commonly found in traditional iron drum filling methods, and improves the overall quality control level of the production process.

[0046] Preferably, the guide tube includes a retaining ring and short steel bars.

[0047] The surrounding ring is provided in two parts.

[0048] One end of the short reinforcing bar is connected to one of the surrounding rings, and the other end of the short reinforcing bar is connected to another surrounding ring. There are multiple short reinforcing bars, and the through groove of the guide tube is formed between adjacent short reinforcing bars.

[0049] By adopting the above technical solutions, the design of the shroud ensures the stability and support of the guide tube, allowing it to be firmly fixed to the chassis. The through-slot design between the short reinforcing bars increases the gas flow path, allowing gas to enter the loading device from multiple directions, improving the uniformity of gas permeation. The through-slots between adjacent short reinforcing bars help reduce gas flow resistance and accelerate gas diffusion, thereby improving the efficiency of carbonitriding.

[0050] In summary, this application includes at least one of the following beneficial technical effects:

[0051] 1. By setting up a mixing pipe and dual fans in the heating furnace, the uniform mixing and rapid flow of CO2 and NH3 gases are achieved, which improves the efficiency of gas penetration into materials, solves the problem of uneven gas distribution in traditional iron drum filling equipment, and ensures the uniformity of carbonitriding.

[0052] 2. The improved loading device adopts a frame design, which facilitates gas to penetrate into the material from the center and the circumference from multiple directions. This eliminates the phenomenon in the traditional iron drum structure where the penetration layer is deep near the guide tube and shallow near the iron drum wall, significantly improving the consistency of the penetration layer of each material and the grinding accuracy.

[0053] 3. The design of the new loading equipment and heating furnace simplifies the manufacturing process, reduces production costs, and is particularly suitable for small-batch, multi-specification production needs, thereby improving overall production efficiency. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of an existing high-efficiency carbonitriding equipment.

[0055] Figure 2 This is a schematic diagram of a high-efficiency carbonitriding device according to an embodiment of this application.

[0056] Figure 3 This is a side view of the loading equipment.

[0057] Figure 4 This is a top view of the loading equipment.

[0058] Explanation of reference numerals in the attached drawings: 11. Heating furnace; 12. First air inlet pipe; 13. Second air inlet pipe; 14. Mixing pipe; 15. Fan;

[0059] 2. Chassis; 21. Bottom ring; 22. Main reinforcing steel bars; 23. Support legs; 24. Reinforcing bars;

[0060] 3. Frame; 31. Enclosure; 32. Heat-resistant steel reinforcement; 33. Lifting lugs; 34. Slots;

[0061] 4. Flow guide tube; 41. Enclosing ring; 42. Short steel bar;

[0062] 5. Through groove. Detailed Implementation

[0063] The present application will be further described in detail below with reference to the accompanying drawings.

[0064] Reference Figure 2 This application discloses a high-efficiency carbonitriding device, including a heating furnace 11, a first air inlet pipe 12, a second air inlet pipe 13, a mixing pipe 14, and a fan 15.

[0065] One end of the first air inlet pipe 12 extends into the heating furnace 11, and the other end of the first air inlet pipe 12 is located outside the heating furnace 11. The other end of the first air inlet pipe 12 is used to connect to a CO2 gas source (carbon dioxide gas source).

[0066] One end of the second air inlet pipe 13 extends into the heating furnace 11, and the other end of the second air inlet pipe 13 is located outside the heating furnace 11. The other end of the second air inlet pipe 13 is used to connect to the NH3 gas source (ammonia gas source).

[0067] The mixing tube 14 is located inside the heating furnace 11. The mixing tube 14 has two connecting ports and at least one outlet. The two connecting ports are respectively connected to the first air inlet pipe 12 and the second air inlet pipe 13.

[0068] Fan 15 is used to drive the gas flow inside the heating furnace 11. There are two fans 15, which are symmetrically arranged about the center of the heating furnace 11.

[0069] Figure 2 In the middle: the mixing tube 14 is located between the two fans 15, the mixing tube 14 is close to the bottom of the heating furnace 11, and the outlet of the mixing tube 14 faces upward;

[0070] Two fans 15 are located at the top and bottom of the heating furnace 11, respectively; both fans 15 are centrifugal, causing the gas inside the heating furnace 11 to move along... Figure 2 The arrows indicate the direction of flow.

[0071] Reference Figure 2 and Figure 3 The high-efficiency carbonitriding equipment also includes a loading device. The loading device is welded as a whole.

[0072] The loading device includes a chassis 2, a frame 3, and a guide tube 4.

[0073] The base 2 is used to place the heating furnace 11. The frame 3 is cylindrical and connected to the base 2. The guide tube 4 is coaxial with the frame 3 and connected to the base 2. The frame 3 and the guide tube 4 are used to place materials.

[0074] The chassis 2, frame 3 and guide tube 4 are all provided with through grooves 5.

[0075] Reference Figure 3 and Figure 4 The chassis 2 includes a bottom ring 21, main steel bars 22, support legs 23, and reinforcing bars 24.

[0076] The main reinforcing bars 22 are connected to the bottom ring 21. Multiple main reinforcing bars 22 are arranged side by side, and the through grooves 5 of the base plate 2 are formed between adjacent main reinforcing bars 22. The support legs 23 are connected to the bottom ring 21 or the main reinforcing bars 22. The reinforcing bars 24 are connected to multiple main reinforcing bars 22 and are connected to the bottom ring 21.

[0077] In the attached diagram: four support legs 23 are provided at equal intervals along the circumference of the bottom ring 21; the reinforcing bars 24 are perpendicular to the main reinforcing bars 22.

[0078] The frame 3 includes a surrounding ring 31, heat-resistant steel bars 32, and lifting lugs 33.

[0079] There are two surrounding rings 31. The upper end of the heat-resistant steel bar 32 is connected to one surrounding ring 31, and the lower end of the heat-resistant steel bar 32 is connected to the other surrounding ring 31. There are multiple heat-resistant steel bars 32, and the through grooves 5 of the frame 3 are formed between adjacent heat-resistant steel bars 32.

[0080] The lug 33 is connected to the upper ring 31. The lug 33 is provided with a slot 34, which passes through the lug 33 along the axial direction of the ring 31.

[0081] In the attached diagram: the surrounding ring 31 includes an inner ring and an outer ring, and the heat-resistant steel bar 32 is located between the inner ring and the outer ring; the outer ring and bottom ring 21 of the lower surrounding ring 31 are integrally formed;

[0082] Corresponding to the support leg 23, four lugs 33 are provided at equal intervals around the circumference of the ring 31; when two loading devices are stacked one on top of the other, the slot 34 can be used for the support leg 23 to be inserted.

[0083] The upper end of the guide tube 4 is lower than the upper end of the frame 3. The guide tube 4 includes a retaining ring 41 and a short steel bar 42.

[0084] Two retaining rings 41 are provided. The upper end of the short steel bar 42 is connected to one retaining ring 41, and the lower end of the short steel bar 42 is connected to the other retaining ring 41. There are multiple short steel bars 42, and the through grooves 5 of the guide tube 4 are formed between adjacent short steel bars 42.

[0085] In the attached diagram: the circumferential ring 41 includes an inner ring and an outer ring, and the short steel bar 42 is located between the inner ring and the outer ring.

[0086] The implementation principle of a high-efficiency carbonitriding device in this application embodiment is as follows:

[0087] The steel plate filling drum was replaced with a steel bar filling frame, which facilitates gas to seep into the material from the center and circumference.

[0088] Mixing the two gases before releasing them improves the uniformity of gas mixing.

[0089] Add a fan 15 at the bottom to promote faster gas flow and improve the efficiency of gas penetration into materials;

[0090] Through testing, the difference in the diffusion layer of each batch of products was reduced from 0.004mm to 0.002mm, and the uniformity was improved by 50%; the production time for each batch of products was shortened from 600 minutes to 540 minutes, and the efficiency was improved by 10%.

[0091] 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. A high-efficiency carbonitriding device, characterized in that, It includes a heating furnace (11), a first air inlet pipe (12), a second air inlet pipe (13), a mixing pipe (14), and a fan (15). One end of the first air inlet pipe (12) extends into the heating furnace (11). One end of the second air inlet pipe (13) extends into the heating furnace (11). The mixing tube (14) is located inside the heating furnace (11). The mixing tube (14) has two connecting ports and at least one outlet. The two connecting ports are respectively connected to the first air inlet pipe (12) and the second air inlet pipe (13). The fan (15) is used to drive the gas flow in the heating furnace (11). There are two fans (15), and the two fans (15) are symmetrically arranged about the center of the heating furnace (11).

2. The high-efficiency carbonitriding equipment according to claim 1, characterized in that, The mixing tube (14) is located between the two fans (15).

3. The high-efficiency carbonitriding equipment according to claim 1 or 2, characterized in that, The two fans (15) are located at the top and bottom of the heating furnace (11), respectively.

4. The high-efficiency carbonitriding equipment according to claim 1, characterized in that, Includes chassis (2) and frame (3). The chassis (2) is used to be placed inside the heating furnace (11). The frame (3) is cylindrical and is connected to the chassis (2). The frame (3) is used to place materials. Both the chassis (2) and the frame (3) are provided with through grooves (5).

5. The high-efficiency carbonitriding equipment according to claim 4, characterized in that, The chassis (2) includes a bottom ring (21), main steel bars (22), and support legs (23). The main steel bars (22) are connected to the bottom ring (21). Multiple main steel bars (22) are provided, and the through groove (5) of the base plate (2) is formed between adjacent main steel bars (22). The support leg (23) is connected to the bottom ring (21) or the main steel bar (22).

6. The high-efficiency carbonitriding equipment according to claim 5, characterized in that, The chassis (2) also includes reinforcing ribs (24). The reinforcing bar (24) is connected to a plurality of the main reinforcing bars (22), and the reinforcing bar (24) is connected to the bottom ring (21).

7. The high-efficiency carbonitriding equipment according to claim 4, characterized in that, The frame (3) includes a surrounding ring (31) and heat-resistant steel bars (32). The enclosure (31) has two sections. One end of the heat-resistant steel bar (32) is connected to one of the surrounding rings (31), and the other end of the heat-resistant steel bar (32) is connected to another surrounding ring (31). The heat-resistant steel bar (32) is provided with multiple grooves, and the through grooves (5) of the frame (3) are formed between adjacent heat-resistant steel bars (32).

8. The high-efficiency carbonitriding equipment according to claim 7, characterized in that, The frame (3) also includes lugs (33). The lug (33) is provided with a slot (34), which passes through the lug (33) axially along the ring (31).

9. The high-efficiency carbonitriding equipment according to claim 4, characterized in that, Including the flow guide tube (4). The guide tube (4) is connected to the chassis (2). The outside of the guide tube (4) and inside the frame (3) are used to place materials. The guide tube (4) is provided with the through groove (5).

10. The high-efficiency carbonitriding equipment according to claim 9, characterized in that, The guide tube (4) includes a retaining ring (41) and short steel bars (42). The circumferential ring (41) is provided in two parts. One end of the short steel bar (42) is connected to one of the surrounding rings (41), and the other end of the short steel bar (42) is connected to another surrounding ring (41). The short steel bar (42) is provided in multiple ways, and the through groove (5) of the guide tube (4) is formed between adjacent short steel bars (42).

Images