A continuous furnace grain refining external slow cooling sealing device

Abstract

The utility model relates to heat treatment equipment technical field, concretely relates to a continuous furnace grain refinement external connection slow cooling sealing device. The specific technical scheme is: a continuous furnace grain refinement external connection slow cooling sealing device, including double -row carburizing furnace, the outlet of double -row carburizing furnace one side is connected with quenching oil pool, the outlet of quenching oil pool is connected with tempering furnace, the outlet of double -row carburizing furnace one end is connected with the medium -cold room, the outlet of medium -cold room is connected with the temperature rise room and the temperature drop room in proper order, the temperature drop room is connected with quenching oil pool. The utility model has solved the problem of the prior art leading to workpiece grain big.

Description

Technical Field

[0001] This utility model relates to the technical field of heat treatment equipment, specifically to an external slow cooling sealing device for continuous furnace grain refinement. Background Technology

[0002] Continuous furnaces, as key equipment in the field of metal heat treatment, are widely used in a series of heat treatment processes such as carburizing, quenching, and tempering of workpieces. Their structural design directly affects the heat treatment quality and production efficiency of the workpieces. An existing type of continuous furnace is designed with the following zones arranged sequentially along the workpiece conveying direction: a pre-oxidation zone, a heating zone, a strong carburizing zone, a diffusion zone, a cooling and holding zone, a quenching table, a post-cleaning zone, and a tempering zone. These functional zones work together to complete the continuous heat treatment process. The cooling and holding zone and the quenching table are arranged at 90° angles to each other. After diffusion treatment, the workpiece is directly transferred from the cooling and holding zone to the quenching table and quickly immersed in the quenching oil bath to complete the quenching process.

[0003] However, the aforementioned old-style continuous furnace has significant structural defects: the equipment lacks an intermediate slow cooling stage. After the workpieces undergo strong infiltration and diffusion treatment, they are directly placed into the quenching oil bath for quenching without an effective gradient cooling process. This heat treatment method results in insufficient grain refinement within the workpiece at high temperatures, leading to uncontrollable grain coarsening. Testing revealed that workpieces treated with this equipment generally have grain sizes larger than grade 4, failing to meet the stringent requirements of high-end workpieces for refined microstructure and stable mechanical properties, thus severely limiting the application of this continuous furnace in high-end manufacturing.

[0004] To address the problem of coarse grains in workpieces caused by the lack of an intermediate slow cooling structure in existing continuous furnaces, it is urgent to rationally modify their structure to improve the heat treatment quality of workpieces and expand the applicable scenarios of the equipment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides an external slow-cooling sealing device for continuous furnace grain refinement, which solves the problem of coarse grains in workpieces caused by existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a continuous furnace grain refinement external slow cooling sealing device, including a double-row carburizing furnace. A quenching oil tank is connected to the outlet of one side of the double-row carburizing furnace, and a tempering furnace is connected to the outlet of the quenching oil tank. An intermediate cooling chamber is connected to the outlet of one end of the double-row carburizing furnace, and a heating chamber and a cooling chamber are sequentially connected to the outlet of the intermediate cooling chamber. The cooling chamber is connected to the quenching oil tank.

[0008] Preferably, the double-row carburizing furnace and the quenching oil bath are set at 90°.

[0009] Preferably, the intermediate cooling chamber, the heating chamber, and the cooling chamber are arranged in a U-shape.

[0010] Preferably, the quenching oil bath includes an oil bath and a transfer chamber disposed above the oil bath and located on one side of the oil bath, the transfer chamber being connected to a double-row carburizing furnace.

[0011] Preferably, the outlet of the cooling chamber is located above the oil tank.

[0012] Preferably, a cleaning machine is connected to the outlet of the quenching oil tank, the cleaning machine is connected to the tempering furnace, and an air-cooling chamber is connected to the outlet of the tempering furnace.

[0013] Preferably, conveyor tracks are provided between the quenching oil tank and the cleaning machine, between the cleaning machine and the tempering furnace, between the tempering furnace and the air-cooling chamber, at the outlet of the air-cooling chamber, and at the entrance of the double-row carburizing furnace.

[0014] Preferably, a preheating furnace is provided at the entrance of the double-row carburizing furnace, and a conveying track located at the entrance of the double-row carburizing furnace is arranged between the double-row carburizing furnace and the preheating furnace.

[0015] Preferably, an insulation door is provided between the intermediate cooling chamber and the heating chamber, and a groove is provided below the insulation door. A first electric push rod is provided on one side of the heating chamber to push the workpiece to the cooling chamber; a second electric push rod is provided on one side of the cooling chamber to push the workpiece to the quenching oil bath.

[0016] Preferably, sealed pipes are provided on corresponding sides of the cooling chamber, one end of each sealed pipe extends out to both sides of the cooling chamber and is equipped with a blower, and the other end extends out to the top of the cooling chamber; radiant tubes are vertically installed in the heating chamber and cooling chamber respectively, and fans are installed on the inner top of the intercooling chamber, heating chamber and cooling chamber respectively.

[0017] This utility model has the following beneficial effects:

[0018] This invention involves connecting an external furnace body to an opening at the end of a double-row carburizing furnace and on the left side of the quenching oil bath (determined by the workpiece's direction of travel). The external furnace body has a U-shaped internal structure, divided into a cooling chamber, a heating chamber, and a cooling chamber. After the workpiece moves to the end of the double-row carburizing furnace, it is not directly rotated out for quenching but instead enters the external furnace body for slow cooling to 600°C. It then turns right and enters the heating zone (heating chamber) for re-austenitization before finally entering the quenching oil bath. The connection between the external furnace body and the double-row carburizing furnace and quenching oil bath is completely sealed to prevent air ingress and potential safety and quality issues. Based on heat treatment phase transformation theory and existing processes, adding the external furnace body can improve the workpiece grain size to level 6-8. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of a portion of the structure based on the above;

[0021] In the diagram: 1. Double-row carburizing furnace; 2. Quenching oil tank; 21. Oil tank; 22. Transfer chamber; 3. Tempering furnace; 4. Intercooling chamber; 5. Heating chamber; 6. Depressing chamber; 7. Cleaning machine; 8. Air-cooled chamber; 9. Conveying track; 10. Preheating furnace; 11. Insulation door. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Unless otherwise specified, the technical means used in the implementation examples are conventional means well known to those skilled in the art.

[0024] refer to Figures 1-2 This utility model discloses a continuous furnace grain refinement external slow cooling sealing device, including a double-row carburizing furnace 1. A quenching oil tank 2 is connected to the outlet of one side of the double-row carburizing furnace 1, and a tempering furnace 3 is connected to the outlet of the quenching oil tank 2. An intermediate cooling chamber 4 is connected to the outlet of one end of the double-row carburizing furnace 1. A heating chamber 5 and a cooling chamber 6 are sequentially connected to the outlet of the intermediate cooling chamber 4, and the cooling chamber 6 is connected to the quenching oil tank 2. The double-row carburizing furnace 1 and the quenching oil tank 2 are arranged at a 90° angle. The intermediate cooling chamber 4, the heating chamber 5, and the cooling chamber 6 are arranged in a U-shape.

[0025] Furthermore, the quenching oil bath 2 includes an oil bath 21 and a transfer chamber 22 disposed above the oil bath 21 and located on one side of the oil bath. The transfer chamber 22 is connected to the double-row carburizing furnace 1. The outlet of the cooling chamber 6 is located above the oil bath 21. A cleaning machine 7 is connected to the outlet of the quenching oil bath 2. The cleaning machine 7 is connected to the tempering furnace 3. An air-cooling chamber 8 is connected to the outlet of the tempering furnace 3.

[0026] Furthermore, conveying tracks 9 are provided between the quenching oil tank 2 and the cleaning machine 7, between the cleaning machine 7 and the tempering furnace 3, between the tempering furnace 3 and the air-cooling chamber 8, at the outlet of the air-cooling chamber 8, and at the entrance of the double-row carburizing furnace 1. The conveying tracks can be understood as conveying mechanisms, which are existing technologies.

[0027] Furthermore, a preheating furnace 10 is provided at the entrance of the double-row carburizing furnace 1, and a conveying track 9 located at the entrance of the double-row carburizing furnace 1 is provided between the double-row carburizing furnace 1 and the preheating furnace 10.

[0028] Furthermore, an insulation door 11 is provided between the intermediate cooling chamber 4 and the heating chamber 5. A groove is provided below the insulation door 11. A first electric push rod is provided on one side of the heating chamber 5 to push the workpiece to the cooling chamber 6. A second electric push rod is provided on one side of the cooling chamber 6 to push the workpiece to the quenching oil tank 2.

[0029] Furthermore, sealed pipes are respectively provided on the corresponding sides of the cooling chamber 6, one end of the sealed pipes extends out of the two sides of the cooling chamber 6 and is equipped with a blower, and the other end extends out of the top of the cooling chamber 6; radiant tubes are respectively vertically installed in the heating chamber 5 and the cooling chamber 6, and fans are respectively installed on the top of the intercooling chamber 4, the heating chamber 5 and the cooling chamber 6.

[0030] In using this invention, the workpiece enters the intercooling chamber from the double-row carburizing furnace via a soft zipper, where it is cooled to 600°C. The intercooling chamber and the heating chamber are separated by an insulated door, with a groove below the insulated door for the soft zipper to pass through. Afterward, the workpiece enters the heating chamber and undergoes austenitization again. It is then propelled forward by a first electric push rod and redirected by a second electric push rod to pass through the cooling chamber into the quenching oil bath. After entering the quenching oil bath, the workpiece is cleaned in a cleaning machine and finally tempered in a tempering furnace.

[0031] Specifically: After the workpiece enters the cooling chamber, blowers on both sides of the equipment force air through sealed pipes inside the equipment, and then exhaust it through the top vent, preventing air from mixing with the gases inside the equipment. Vertical radiant tubes are installed in the cooling chamber. These tubes are energized to heat the workpiece when its temperature drops below a preset level, simultaneously shutting off the blowers to prevent the workpiece from overcooling and developing an imbalance structure. After the workpiece enters the heating chamber, it is heated by the vertical radiant tubes located on both sides.

[0032] The inner top of the intercooling chamber, heating chamber, and cooling chamber all have fans, and the rotation of the fans can make the temperature inside the equipment more uniform.

[0033] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A continuous furnace grain refinement external slow cooling sealing device, comprising a double-row carburizing furnace (1), characterized in that: A quenching oil tank (2) is connected to the outlet on one side of the double-row carburizing furnace (1), and a tempering furnace (3) is connected to the outlet of the quenching oil tank (2); a medium cooling chamber (4) is connected to the outlet at one end of the double-row carburizing furnace (1), and a heating chamber (5) and a cooling chamber (6) are connected sequentially to the outlet of the medium cooling chamber (4), and the cooling chamber (6) is connected to the quenching oil tank (2).

2. The continuous furnace grain refinement external slow cooling sealing device according to claim 1, characterized in that: The double-row carburizing furnace (1) is set at 90° to the quenching oil tank (2).

3. A continuous furnace grain refinement external slow cooling sealing device according to claim 1 or 2, characterized in that: The intermediate cooling chamber (4), the heating chamber (5), and the cooling chamber (6) are arranged in a Z-shape.

4. The continuous furnace grain refinement external slow cooling sealing device according to claim 1, characterized in that: The quenching oil bath (2) includes an oil bath (21) and a transfer chamber (22) located above the oil bath (21) and on one side of the oil bath. The transfer chamber (22) is connected to the double-row carburizing furnace (1).

5. The continuous furnace grain refinement external slow cooling sealing device according to claim 4, characterized in that: The outlet of the cooling chamber (6) is located above the oil pool (21).

6. The continuous furnace grain refinement external slow cooling sealing device according to claim 1, characterized in that: A cleaning machine (7) is connected to the outlet of the quenching oil tank (2), and the cleaning machine (7) is connected to the tempering furnace (3). An air-cooling chamber (8) is connected to the outlet of the tempering furnace (3).

7. The continuous furnace grain refinement external slow cooling sealing device according to claim 6, characterized in that: Conveying tracks (9) are provided between the quenching oil tank (2) and the cleaning machine (7), between the cleaning machine (7) and the tempering furnace (3), between the tempering furnace (3) and the air-cooling chamber (8), at the outlet of the air-cooling chamber (8), and at the entrance of the double-row carburizing furnace (1).

8. The continuous furnace grain refinement external slow cooling sealing device according to claim 7, characterized in that: A preheating furnace (10) is provided at the entrance of the double-row carburizing furnace (1), and a conveying track (9) located at the entrance of the double-row carburizing furnace (1) is provided between the double-row carburizing furnace (1) and the preheating furnace (10).

9. The continuous furnace grain refinement external slow cooling sealing device according to claim 1, characterized in that: An insulated door (11) is provided between the intermediate cooling chamber (4) and the heating chamber (5). A groove is provided below the insulated door (11). A first electric push rod is provided on one side of the heating chamber (5) to push the workpiece to the cooling chamber (6). A second electric push rod is provided on one side of the cooling chamber (6) to push the workpiece to the quenching oil bath (2).

10. The continuous furnace grain refinement external slow cooling sealing device according to claim 9, characterized in that: Sealed pipes are provided on both sides of the cooling chamber (6). One end of the sealed pipe extends out of both sides of the cooling chamber (6) and is equipped with a blower. The other end extends out of the top of the cooling chamber (6). Radiation pipes are vertically installed in the heating chamber (5) and cooling chamber (6). Fans are installed on the top of the cooling chamber (4), heating chamber (5) and cooling chamber (6).

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