A nitriding oxidation device for cast iron pot production

Abstract

This utility model relates to the field of nitriding technology for cast iron pots, specifically a nitriding oxidation device for the production of cast iron pots. It includes a nitriding furnace body, a pot rack placed within the cavity of the furnace body, a placement rack 1 mounted on the pot rack, and a placement rack 2 inserted into the other end of the placement rack 1. Positioning structures are fixed on both placement rack 1 and placement rack 2. The advantages are: by designing a slotted insertion and adjustment structure between placement rack 1 and placement rack 2, the distance between the two placement racks can be flexibly adjusted according to the different depths of the cast iron pot, ensuring the pot is placed stably. Then, through spacers and fixing sleeves, placement rack 1 and placement rack 2 are pushed to move within the slots, thereby shortening the distance and adapting to cast iron pots of different depths. Simultaneously, the pads, backing pads, and side pads set on the placement racks, through their mutually perpendicular arc-shaped slopes, make multi-point contact with the pot body, not only improving the stability of positioning but also effectively distributing force and preventing pot shaking or localized damage.

Description

Technical Field

[0001] This utility model relates to the field of nitriding technology for cast iron pots, specifically a nitriding oxidation device for the production of cast iron pots. Background Technology

[0002] In the production process of cast iron pots, nitriding oxidation is often used to improve their corrosion resistance, hardness, and surface appearance. This process involves allowing nitrogen and oxygen to penetrate the surface of the cast iron under high temperature conditions, forming a nitrided layer and an oxide layer, thereby enhancing the performance of the cast iron pot. The cast iron pot is placed on a pot rack, and then the pot rack is placed in a nitriding furnace for nitriding. The nitriding furnace consists of a furnace shell, furnace lining, heating elements, furnace chamber, atmosphere control system, sealing and cooling device, and control system. Inside the furnace, the heating elements uniformly raise the temperature to the required high temperature, allowing nitrogen atoms to penetrate the surface of the cast iron pot in a stable nitrogen or ammonia atmosphere and react with the iron matrix to form a dense nitrided layer. At the same time, the furnace shell and furnace lining provide mechanical support and thermal insulation protection, the sealing and cooling device maintains the furnace's airtightness and regulates heat distribution, and the control system monitors temperature and atmosphere parameters in real time to ensure a continuous and stable reaction. After heating, holding, and slow cooling processes, excess gas is discharged, ultimately resulting in a uniform, high-hardness, wear-resistant, and corrosion-resistant nitrided surface on the cast iron pot.

[0003] In the prior art, such as a hanging device for nitriding cast iron pots (application number CN202420442709.6), a hanging rod for hanging cast iron pots is set on the top of a ring frame. To ensure that the pots remain firmly in place during the process, a sleeve is fitted onto the outside of the hanging rod. The sleeve is connected to the bottom cavity of the central frame through a distribution frame and a central rod, and can move vertically upward. During the movement, the sleeve can be separated from the central rod, which facilitates the loading and unloading of the cast iron pots. In addition, the spring force during the process can firmly press the pots together, preventing them from falling off. The central rod is moved upward by pulling a rope and a handle.

[0004] However, the contact points on the existing support frame are mostly flat or have only a few supports. During the nitriding or oxidation process, the pot body is prone to slight shaking or displacement due to localized stress concentration, resulting in uneven heating of the heat treatment layer. Utility Model Content

[0005] The purpose of this invention is to provide a nitriding oxidation device for the production of cast iron pots, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: it includes a nitriding furnace body, a pot rack is placed inside the cavity of the nitriding furnace body, a placement rack one is installed on the pot rack, a placement rack two is inserted into the other end of the placement rack one, a positioning structure is fixed on the placement rack one and the placement rack two, the positioning structure is used to position the cast iron pot, and the distance between the placement rack one and the placement rack two is adjusted by an adjustment structure.

[0007] Preferably, the pot rack has a ring structure and multiple layers.

[0008] Preferably, the first and second placement racks slide on the pot rack, and there are multiple sets of the first and second placement racks, with one-to-one correspondence between the first and second placement racks. The first and second placement racks are arranged in a circular array around the central axis of the pot rack, and multiple sets of the first and second placement racks are distributed on each layer of the pot rack.

[0009] Preferably, one end of the placement rack is provided with a slot, and one end of the placement rack is inserted into the slot of the placement rack.

[0010] Preferably, the positioning structure includes pads, backrests, and side pads. There are two sets of pads, one set of pads is fixed to one side of the first placement rack, and the other set of pads is fixed to one side of the second placement rack. A connecting rod is fixed to the upper surface of the second placement rack, and the backrest is fixed to the side of the connecting rod. There are two sets of side pads, and the two sets of side pads are fixed to the arc-shaped sides of the first placement rack respectively. The two sets of side pads and the two sets of pads are perpendicular to each other. The pads, backrests, and side pads are all in contact with the cast iron pot, and their surfaces are provided with arc slopes.

[0011] Preferably, the adjustment structure includes a spacer and a fixing sleeve. The spacer is fitted on the outside of the pot rack and is located between the two sets of placement rack one and placement rack two. The fixing sleeve is screwed onto the outside of the spacer. There are two sets of fixing sleeves. The two sets of fixing sleeves have a sleeve-shaped structure and are respectively fitted to the two sets of placement rack one and placement rack two.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The nitriding and oxidation device for cast iron pot production proposed in this utility model features a slotted insertion and adjustment structure between two placement racks. This allows for flexible adjustment of the distance between the two placement racks according to the different depths of the cast iron pot, ensuring stable placement of the pot. Then, through spacers and fixing sleeves, placement racks one and two are pushed to move within the slots, thereby shortening the distance and adapting to cast iron pots of different depths. At the same time, the pads, backing pads, and side pads set on the placement racks, through their mutually perpendicular arc-shaped slopes, make multi-point contact with the pot body, which not only improves the stability of positioning but also effectively distributes the force and prevents the pot body from shaking or being damaged locally. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the pot rack structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the positioning structure of this utility model;

[0017] Figure 4 This utility model Figure 3 A schematic diagram of the split structure;

[0018] Figure 5 This is a schematic diagram of the structure of the first and second placement racks of this utility model.

[0019] In the diagram: 1. Nitriding furnace body; 2. Pot rack; 3. Placement rack one; 4. Cast iron pot; 5. Spacer; 6. Fixing sleeve; 7. Slot; 8. Placement rack two; 9. Pad; 10. Backrest; 11. Connecting rod; 12. Side pad. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Example 1

[0022] Please see Figures 1 to 5 This utility model provides a technical solution: a nitriding oxidation device for the production of cast iron pots, including a nitriding furnace body 1, a pot rack 2 placed in the cavity of the nitriding furnace body 1, the pot rack 2 having a ring structure, the pot rack 2 having multiple layers, a placement rack 3 installed on the pot rack 2, a placement rack 8 inserted at the other end of the placement rack 3, the placement rack 3 and the placement rack 8 sliding on the pot rack 2, the placement rack 3 and the placement rack 8 having multiple sets, and the placement rack 3 and the placement rack 8 corresponding one-to-one, the placement rack 3 and the placement rack 8 being arranged in a circumferential array around the central axis of the pot rack 2, and multiple sets of placement rack 3 and placement rack 8 being distributed on each layer of the pot rack 2;

[0023] Specifically, the main body 1 of the nitriding furnace consists of a furnace shell, furnace lining, heating elements, furnace chamber, atmosphere control system, sealing and cooling device, and control system. This allows the furnace to form a stable nitriding environment under high temperature conditions. The furnace shell and furnace lining provide mechanical support and thermal insulation protection. The furnace chamber carries the cast iron pot to be treated. The heating elements uniformly raise the temperature inside the furnace to the required level. At the same time, the atmosphere control system continuously adjusts the nitrogen flow rate and composition, allowing nitrogen atoms to penetrate into the pot surface at high temperature and react with the iron matrix to form a dense nitriding layer. Throughout the heating and holding stages, the sealing and cooling device maintains the furnace body's airtightness and controls the heat distribution. The control system monitors the temperature and atmosphere parameters in real time to ensure that the reaction proceeds continuously and stably. As the temperature inside the furnace slowly decreases, excess gas is discharged, and the surface of the cast iron pot finally obtains a uniform, high-hardness, wear-resistant, and corrosion-resistant nitriding layer.

[0024] To reiterate, during this process, the atmosphere control system continuously introduces a nitrogen source. Nitrogen atoms penetrate the cast iron surface at high temperatures, reacting chemically with the iron matrix to form an iron nitride layer, resulting in Fe+. N2→FeN, nitrogen rapidly penetrates the surface of cast iron and reacts with the iron matrix to form an iron nitride layer, forming Fe+N→Fe3N.

[0025] Example 2

[0026] Based on Embodiment 1, in order to achieve the positioning of the cast iron pot 4, a placement rack 3 is provided with a slot 7 at one end, and a placement rack 8 is inserted into the slot 7 of the placement rack 3. Positioning structures are fixed on both the placement rack 3 and the placement rack 8. These positioning structures are used to position the cast iron pot 4 and include pads 9, backrests 10, and side pads 12. Two sets of pads 9 are provided; one set is fixed to one side of the placement rack 3, and the other set is fixed to one side of the placement rack 8. A connecting rod 11 is fixed to the upper surface of the placement rack 8, and the backrest 10 is fixed to the side of the connecting rod 11. Two sets of side pads 12 are provided. Side pads 12 are fixed on both sides of the arc of the first placement rack 3. The two sets of side pads 12 and the two sets of pad blocks 9 are perpendicular to each other. The pad blocks 9, back pads 10 and side pads 12 are all in contact with the cast iron pot 4, and their surfaces are provided with arc slopes. The distance between the first placement rack 3 and the second placement rack 8 is adjusted by an adjustment structure. The adjustment structure includes a spacer 5 and a fixing sleeve 6. The spacer 5 is fitted on the outside of the pot rack 2 and is located between the two sets of the first placement rack 3 and the second placement rack 8. The fixing sleeve 6 is screwed on the outside of the spacer 5. There are two sets of fixing sleeves 6. The two sets of fixing sleeves 6 have a sleeve-shaped structure and are respectively attached to the two sets of the first placement rack 3 and the second placement rack 8.

[0027] Specifically, the cast iron pot 4 is placed on the pot rack 2, which consists of the first rack 3 and the second rack 8. Through the cooperation of the spacer 5 and the fixing sleeve 6, the operator can flexibly adjust the distance between the first rack 3 and the second rack 8 to accommodate cast iron pots 4 of different depths, while ensuring the stability of the pot body. After adjustment, the pad 9, the backing pad 10, and the side pad 12 are in close contact with the surface of the cast iron pot 4. The arc slope design makes the contact points evenly distributed. The multi-point force not only improves the positioning stability but also effectively disperses the pressure, preventing the pot body from shaking or being damaged locally. During operation, the spacer 5 pushes the fixing sleeve 6 to tighten or loosen, allowing the first rack 3 and the second rack 8 to move smoothly within the slot 7, completing the shortening or extension of the distance.

[0028] In use, the cast iron pot 4 is placed on the support system consisting of placement rack 3 and placement rack 8. By adjusting the cooperation of the spacer sleeve 5 and the fixing sleeve 6 in the structure, the placement rack 3 and placement rack 8 are pushed to slide in the slot 7, thereby shortening or lengthening the distance between the two placement racks, so that it can adapt to cast iron pots 4 of different depths and ensure the stability of the pot body. At the same time, the pad 9, back pad 10 and side pad 12 in the positioning structure contact the pot body through mutually perpendicular arc slopes, realizing multi-point support and uniform force distribution. While adjusting the distance, they form a tight fit with the pot body, avoiding shaking or excessive local force, ensuring the stability and safety of the cast iron pot 4 throughout the operation process, and enabling the support system to flexibly adapt to pots of different sizes and provide a reliable positioning effect.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nitriding oxidation apparatus for the production of cast iron pots, comprising a nitriding furnace body (1), wherein a pot rack (2) is placed within the cavity of the nitriding furnace body (1), characterized in that: The pot rack (2) is equipped with a first placement rack (3), and the other end of the first placement rack (3) is fitted with a second placement rack (8). The first placement rack (3) and the second placement rack (8) are fixed with positioning structures. The positioning structures are used to position the cast iron pot (4). The distance between the first placement rack (3) and the second placement rack (8) is adjusted by adjusting the structure.

2. The nitriding oxidation apparatus for cast iron pot production according to claim 1, characterized in that: The pot rack (2) has a ring structure and multiple layers.

3. The nitriding oxidation apparatus for cast iron pot production according to claim 2, characterized in that: The first (3) and the second (8) of the placement rack slide on the pot rack (2). There are multiple sets of the first (3) and the second (8) of the placement rack, and the first (3) and the second (8) of the placement rack correspond one to one. The first (3) and the second (8) of the placement rack are arranged in a circular array around the central axis of the pot rack (2). Multiple sets of the first (3) and the second (8) of the placement rack are distributed on each layer of the pot rack (2).

4. The nitriding oxidation apparatus for cast iron pot production according to claim 1, characterized in that: One end of the placement rack 1 (3) is provided with a slot (7), and one end of the placement rack 2 (8) is inserted into the slot (7) of the placement rack 1 (3).

5. The nitriding oxidation apparatus for cast iron pot production according to claim 1, characterized in that: The positioning structure includes a pad (9), a backrest (10), and a side pad (12). There are two sets of pads (9). One set of pads (9) is fixed on one side of the first placement rack (3), and the other set of pads (9) is fixed on one side of the second placement rack (8). A connecting rod (11) is fixed on the upper surface of the second placement rack (8). The backrest (10) is fixed on the side of the connecting rod (11). There are two sets of side pads (12). The two sets of side pads (12) are fixed on the arc-shaped sides of the first placement rack (3). The two sets of side pads (12) and the two sets of pads (9) are perpendicular to each other. The pads (9), backrest (10), and side pads (12) are all in contact with the cast iron pot (4), and their surfaces are provided with an arc slope.

6. The nitriding oxidation apparatus for cast iron pot production according to claim 1, characterized in that: The adjustment structure includes a spacer (5) and a fixing sleeve (6). The spacer (5) is fitted on the outside of the pot rack (2) and is located between the two sets of placement rack one (3) and placement rack two (8). The fixing sleeve (6) is screwed on the outside of the spacer (5). There are two sets of fixing sleeves (6). The two sets of fixing sleeves (6) are in the shape of a sleeve and are respectively attached to the two sets of placement rack one (3) and placement rack two (8).

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