A graphite nozzle with a flap buffer function

Abstract

This utility model belongs to the field of vacuum gas quenching furnace technology, and particularly relates to a graphite nozzle with a flip-plate buffer function. It includes: a graphite nozzle body, comprising a nozzle head and a nozzle tail. A nitrogen channel is provided inside the nozzle head, and a graphite flip-plate mounting cavity communicating with the nitrogen channel is provided inside the nozzle tail. The graphite flip-plate is rotatably mounted in the graphite flip-plate mounting cavity via a molybdenum mounting rod. A buffer screw mounting hole is provided on the nozzle tail, and a buffer screw is movably mounted in the buffer screw mounting hole. A nut that cooperates with the buffer screw is provided at the end of the buffer screw inside the graphite flip-plate mounting cavity. When nitrogen is filled into the vacuum gas quenching furnace, the graphite flip-plate flips open and impacts the lower end of the molybdenum mounting rod, thereby effectively buffering the upward-flipping graphite flip-plate and preventing breakage during the flipping process.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum quenching furnace technology, and in particular relates to a graphite nozzle with a flip-plate buffer function. Background Technology

[0002] Quenching is a heat treatment process in which steel parts are heated to the austenitizing temperature and held for a certain time, and then cooled at a rate greater than the critical cooling rate to obtain a non-diffusion transformation structure, such as martensite, bainite and austenite. Vacuum quenching furnaces are suitable for solution treatment and aging treatment of large and medium-sized vacuum product parts.

[0003] During use, vacuum gas quenching furnaces require the injection of protective nitrogen gas into the furnace body. Therefore, graphite nozzles are installed on the inner wall of the furnace body. However, the existing graphite nozzle structure is unreasonable. During use, the graphite flaps are easily broken by impact, resulting in a short service life and failing to meet the usage requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a graphite nozzle with a flap buffer function.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a graphite nozzle with a flap buffer function, comprising: a graphite nozzle body, the graphite nozzle body including a nozzle head and a nozzle tail, a nitrogen channel provided inside the nozzle head, and a graphite flap mounting cavity connected to the nitrogen channel provided inside the nozzle tail, the graphite flap being rotatably mounted in the graphite flap mounting cavity by a molybdenum mounting rod, a mounting hole provided on one end of the mounting head of the graphite flap, and molybdenum rod mounting holes provided on both sides of the nozzle tail, the molybdenum mounting rod passing through the molybdenum rod mounting hole and the graphite. The mounting holes on the flip plate have inner diameters larger than the diameter of the molybdenum mounting rod. A limiting step that mates with the other end of the graphite flip plate is provided inside the graphite flip plate mounting cavity. A buffer screw mounting hole is provided at the tail of the nozzle. A buffer screw is movably installed in the buffer screw mounting hole. The diameter of the buffer screw is smaller than the inner diameter of the buffer screw mounting hole. A nut that mates with the buffer screw is provided at the end of the buffer screw inside the graphite flip plate mounting cavity. The outer diameter of the nut is larger than the inner diameter of the buffer screw mounting hole. Several fixing bolt holes are provided at the tail of the nozzle.

[0006] To solve the above-mentioned technical problems, the present invention adopts a further technical solution: the graphite nozzle body and the graphite flap are made of isostatic graphite material.

[0007] To solve the above-mentioned technical problems, the present invention adopts a further technical solution: the buffer screw and the nut are made of high-temperature molybdenum material.

[0008] To solve the above-mentioned technical problems, the present invention adopts a further technical solution: two fixing bolt holes are provided on the tail of the nozzle, and the two fixing bolt holes are arranged obliquely and symmetrically.

[0009] To solve the above-mentioned technical problems, the present invention adopts a further technical solution as follows: the nozzle head is a circular structure, the nozzle tail is a square structure, the graphite flap mounting cavity is a square structure, and the graphite flap is a square structure.

[0010] The advantages of this invention are: when nitrogen is filled into the vacuum quenching furnace, the graphite flap flips open and impacts the lower end of the molybdenum mounting rod. The molybdenum mounting rod slides upward a distance within the buffer screw mounting hole, and then the nut impacts the inner wall of the nozzle tail, thus effectively buffering the upward-flipping graphite flap, preventing it from breaking during the flipping process, extending the number of times the graphite flap can be used, and ensuring the service life of the graphite nozzle and product quality.

[0011] The graphite nozzle body and graphite flap are made of isostatic graphite material. Isostatic graphite has better physical properties than high-purity graphite, with higher density, higher strength and better corrosion resistance.

[0012] The buffer screw and nut are made of high-temperature molybdenum material, which can withstand temperatures of around 2600℃, thus better meeting the usage requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a graphite nozzle with a flap buffer function according to the present invention.

[0014] Figure 2 This is a cross-sectional structural diagram of a graphite nozzle with a flap buffer function according to the present invention.

[0015] In the figure: 1. Graphite nozzle body, 11. Nozzle head, 12. Nozzle tail, 121. Molybdenum rod mounting hole, 2. Nitrogen channel, 3. Graphite flap mounting cavity, 31. Limiting step, 4. Graphite flap, 41. Mounting head, 42. Mounting hole, 5. Molybdenum mounting rod, 6. Buffer screw mounting hole, 7. Buffer screw, 8. Nut, 9. Fixing bolt hole. Detailed Implementation

[0016] The specific content of this utility model will now be described in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 and Figure 2As shown, a graphite nozzle with a flap buffer function includes: a graphite nozzle body, the graphite nozzle body including a nozzle head 11 and a nozzle tail 12, a nitrogen channel 2 is provided inside the nozzle head 11, and a graphite flap mounting cavity 3 communicating with the nitrogen channel 2 is provided inside the nozzle tail 12, a graphite flap 4 is rotatably mounted in the graphite flap mounting cavity 3 by a molybdenum mounting rod 5, a mounting hole 42 is provided on one end of the graphite flap 4 mounting head 41, and molybdenum rod mounting holes 121 are provided on both sides of the nozzle tail 12, the molybdenum mounting rod 5 passes through the molybdenum rod mounting hole 121 and the mounting hole 42 on the graphite flap 4. The inner diameters of the molybdenum rod mounting holes 121 and 42 are larger than the diameter of the molybdenum mounting rod 5. A limiting step 31 that cooperates with the other end of the graphite flap 4 is provided in the graphite flap mounting cavity 3. A buffer screw mounting hole 6 is provided on the nozzle tail 12. A buffer screw 7 is movably disposed in the buffer screw mounting hole 6. The diameter of the buffer screw 7 is smaller than the inner diameter of the buffer screw mounting hole 6. A nut 8 that cooperates with the buffer screw 7 is provided on the end of the buffer screw 7 inside the graphite flap mounting cavity 3. The outer diameter of the nut 8 is larger than the inner diameter of the buffer screw mounting hole 6. Several fixing bolt holes 9 are provided on the nozzle tail 12.

[0018] In use, the graphite nozzle is fixed to the inner wall of the vacuum quenching furnace by passing a fixing bolt through the fixing bolt hole 9 and the nozzle tail 12. The nozzle head 11 of the graphite nozzle is fixed in the installation cavity that matches the inner wall of the vacuum quenching furnace. The end of the nozzle head 11 extends out of the inner wall of the vacuum quenching furnace and connects to the nitrogen pipe. When nitrogen is filled into the vacuum quenching furnace, the nitrogen in the nitrogen pipe enters the graphite flap installation cavity 3 connected to it through the nitrogen channel 2, pushing the graphite flap 4 to flip open, and nitrogen enters the interior of the vacuum quenching furnace. As the graphite flap 4 flips open, it impacts the lower end of the molybdenum mounting rod 5. The molybdenum mounting rod 5 slides upwards within the buffer screw mounting hole 6 to the upper limit position. Then, the nut 8 impacts the inner wall of the nozzle tail 12, thus effectively buffering the upward-flipping graphite flap 4 and preventing it from breaking during the flipping process. After nitrogen filling, the graphite flap 4 automatically flips back to its original position under gravity and is supported on the limit step 31. At the same time, the molybdenum mounting rod 5 also slides to the lower limit position under gravity.

[0019] In this embodiment, the graphite nozzle body and the graphite flap 4 are made of isostatic graphite material. Isostatic graphite has better physical properties than high-purity graphite, and it has higher density, higher strength and better corrosion resistance.

[0020] In this embodiment, the buffer screw 7 and the nut 8 are made of high-temperature molybdenum material, which can withstand high temperatures of about 2600°C, thus better meeting the usage requirements.

[0021] In this embodiment, two fixing bolt holes 9 are provided on the nozzle tail 12. The two fixing bolt holes 9 are arranged obliquely and symmetrically, which can better fix the graphite nozzle to the inner wall of the vacuum quenching furnace.

[0022] In this embodiment, the nozzle head 11 is a circular structure, the nozzle tail 12 is a square structure, the graphite flap mounting cavity 3 is a square structure, and the graphite flap 4 is a square structure, making the structure of the graphite nozzle more reasonable and stable.

[0023] The above embodiments describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from the spirit and scope of this utility model, and all such changes and modifications should fall within the scope of this utility model as claimed.

Claims

1. A graphite nozzle with a flap buffer function, comprising: A graphite nozzle body, characterized in that: the graphite nozzle body includes a nozzle head (11) and a nozzle tail (12), a nitrogen channel (2) is provided inside the nozzle head (11), and a graphite flap mounting cavity (3) connected to the nitrogen channel (2) is provided inside the nozzle tail (12). A graphite flap (4) is rotatably mounted in the graphite flap mounting cavity (3) by a molybdenum mounting rod (5). A mounting hole (42) is provided on the mounting head (41) at one end of the graphite flap (4), and molybdenum rod mounting holes (121) are provided on the nozzle tails (12) on both sides of the graphite flap (4). The molybdenum mounting rod (5) passes through the molybdenum rod mounting hole (121) and the mounting hole (42) on the graphite flap (4). The inner diameter of the hole (121) and the mounting hole (42) is larger than the diameter of the molybdenum mounting rod (5). A limiting step (31) that cooperates with the other end of the graphite flap (4) is provided in the graphite flap mounting cavity (3). A buffer screw mounting hole (6) is provided on the nozzle tail (12). A buffer screw (7) is movably provided in the buffer screw mounting hole (6). The diameter of the buffer screw (7) is smaller than the inner diameter of the buffer screw mounting hole (6). A nut (8) that cooperates with the buffer screw (7) is provided on the end of the buffer screw (7) inside the graphite flap mounting cavity (3). The outer diameter of the nut (8) is larger than the inner diameter of the buffer screw mounting hole (6). Several fixing bolt holes (9) are provided on the nozzle tail (12).

2. A graphite nozzle with a flap buffer function according to claim 1, characterized in that: The graphite nozzle body and the graphite flap (4) are made of isostatic graphite material.

3. A graphite nozzle with a flap buffer function according to claim 1, characterized in that: The buffer screw (7) and the nut (8) are made of high-temperature molybdenum material.

4. A graphite nozzle with a flap buffer function according to claim 1, characterized in that: Two fixing bolt holes (9) are provided on the nozzle tail (12), and the two fixing bolt holes (9) are arranged obliquely symmetrically.

5. A graphite nozzle with a flap buffer function according to claim 1, characterized in that: The nozzle head (11) has a circular structure, the nozzle tail (12) has a square structure, the graphite flap mounting cavity (3) has a square structure, and the graphite flap (4) has a square structure.

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