Supporting mechanism for ventilating duct of pit type nitriding furnace

Abstract

The utility model relates to the technical field of nitriding furnaces, in particular to a pit type nitriding furnace air duct supporting mechanism which comprises a muffle and an air duct, a supporting portion is arranged on the inner wall of the muffle, a reverse top portion is arranged on the outer vertical face of the top of the air duct, the air duct abuts against the supporting portion through the reverse top portion and is hung in the muffle, and an air guide channel is reserved between the supporting portion and the reverse top portion. The inner wall of the muffle is further provided with a positioning part used for circumferential positioning of the air guide barrel, the air guide barrel can abut against the supporting part through the reverse top part to be hung in the muffle, the circumferential position of the air guide barrel is determined through the positioning part in the muffle, the stability of placement of the air guide barrel is guaranteed, the air guide barrel is located in the muffle, and therefore the air guide barrel is prevented from being damaged. The air guide channel is further reserved between the supporting part and the reverse top part, and compared with an existing pit type nitriding furnace, the pit type nitriding furnace has the advantage that the flowing property of atmosphere gas is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of nitriding furnaces, and in particular to a support mechanism for an air duct of a pit-type nitriding furnace. Background Art

[0002] Nitriding is a key process to improve the wear resistance of the workpiece surface. Existing gas nitriding equipment includes pit-type nitriding furnace, box-type nitriding furnace, etc. Among them, the pit-type nitriding furnace is a commonly used gas nitriding equipment for carbon steel parts. The uniformity of nitriding and the cooling rate after the nitriding process are important performance indicators for measuring the pit-type nitriding furnace, which reflects the quality and processing efficiency of the workpiece after nitriding treatment.

[0003] During the installation of the existing air duct, the top of the air duct is usually in an inverted cone shape, and an inverted tripod is installed on the inner wall of the muffle. The conical portion of the air duct is seated on the inverted tripod to achieve the installation of the air duct. Since the conical portion of the air duct occupies a large area on the radial surface of the muffle, the flowability of the atmosphere gas will become poor. The present application provides a support mechanism for the air duct of a pit-type nitriding furnace to solve the problem of poor ventilation performance after the air duct is installed. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide a support mechanism for the air duct of a pit-type nitriding furnace, which solves the problem of poor ventilation performance after the air duct is installed.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] The air duct support mechanism of the pit-type nitriding furnace of the present invention comprises a muffle and an air duct, wherein a support portion is provided on the inner wall of the muffle, and a counter-top is provided on the outer facade of the top of the air duct, and the air duct is suspended in the muffle by the counter-top being against the support portion, an air guide channel is left between the support portion and the counter-top, and a positioning portion for circumferential positioning of the air duct is also provided on the inner wall of the muffle.

[0007] By adopting the above technical scheme: the air guide tube can be suspended in the muffle by the anti-top and the supporting part, and the circumferential position of the air guide tube is determined by the positioning part in the muffle, thereby ensuring the stability of the placement of the air guide tube. The air guide tube is seated in the muffle, and an air guide channel is left between the supporting part and the anti-top. Compared with the existing pit-type nitriding furnace, the pit-type nitriding furnace of this scheme greatly improves the flow performance of the atmosphere gas.

[0008] The supporting part is a fixed block, which is distributed in a ring shape on the inner wall of the muffle. The anti-top part is an anti-top block, which is distributed in a ring shape on the outer facade of the air guide tube. A limiting groove is provided on the top of the fixed block, and the bottom end of each anti-top block is placed in the corresponding limiting groove.

[0009] By adopting the above technical solution: the air guide tube is connected to the fixing seat on the inner wall of the muffle through the anti-top block, so that the air guide tube is suspended in the muffle, and a limiting groove is provided on the fixing seat to ensure that the air guide tube can be located in the center of the muffle, thereby ensuring the uniformity of gas circulation around the air guide tube.

[0010] The positioning part is provided with at least one group, and the positioning part comprises two positioning plates, the distance between the two positioning plates is slightly greater than the thickness of the anti-top block, and any anti-top block is inserted between the two positioning plates.

[0011] By adopting the above technical solution: two positioning plates are provided, and any anti-top block is inserted between the two positioning plates, the circumference of the air guide tube can be limited, thereby improving the stability of the air guide tube.

[0012] The air guide channel is surrounded by the inner wall of the muffle, the outer wall of the air guide cylinder, and two adjacent fixed blocks and a counter-top block that cooperate with each other.

[0013] By adopting the above technical solution: after the muffle is installed, air guide channels are opened between adjacent fixed blocks and counter-top blocks, which reduces the occupation of the radial area of ​​the muffle and improves the circulation performance of the atmosphere gas through the air guide channels.

[0014] A retaining ring is sleeved on the air guide tube, the inner wall of the retaining ring is fixedly connected to the air guide tube through a reverse top block, and the bottom of the retaining ring abuts against the limiting groove.

[0015] By adopting the above technical solution: the outer ring of the air guide tube is concentrically installed with a retaining ring through the counter-top block, so as to ensure that the air guide tube is placed on the fixed block with sufficient stability.

[0016] The above solution has the following advantages:

[0017] 1. In the present application, the air guide tube can be suspended in the muffle by the anti-top and the support part, and the circumferential position of the air guide tube is determined by the positioning part in the muffle, thereby ensuring the stability of the placement of the air guide tube. The air guide tube is seated in the muffle, and an air guide channel is left between the support part and the anti-top. Compared with the existing pit-type nitriding furnace, the pit-type nitriding furnace of this scheme greatly improves the flow performance of the atmosphere gas.

[0018] 2. In the present application, the air duct is connected to the fixing seat on the inner wall of the muffle through the anti-top block, so that the air duct is suspended in the muffle, and a limiting groove is provided on the fixing seat to ensure that the air duct can be located in the center of the muffle and ensure the uniformity of gas circulation around the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic cross-sectional view of the air guide tube support mechanism of the pit-type nitriding furnace of the present application;

[0020] Figure 2This is a schematic diagram of the top view of the structure of the air guide tube support mechanism of the pit-type nitriding furnace of the present application.

[0021] Figure numerals: 1, muffle; 2, air guide tube; 3, positioning plate; 4, workpiece; 5, counter-top block; 6, fixing seat; 61, limiting groove; 7, retaining ring; 8, air guide channel. DETAILED DESCRIPTION

[0022] The present invention is described below with reference to the accompanying drawings and embodiments.

[0023] Example

[0024] The air guide tube support mechanism of the pit type nitriding furnace of this embodiment is as follows Figure 1 As shown, it includes a muffle 1 and an air guide tube 2, a fixed block is provided on the inner wall of the muffle 1, and an anti-top block 5 is provided on the outer facade of the top of the air guide tube 2. The air guide tube 2 is abutted against the fixed block by the anti-top block 5 to ensure that the air guide tube 2 is suspended in the muffle 1, and the air guide tube 2 is used to place a workpiece 4. It should be noted that the anti-top block 5 and the fixed block both adopt a vertically arranged sheet structure with a width of 3-5 cm to reduce the area occupied by the radial plane, and an air guide channel 8 is left between the fixed blocks and the anti-top blocks 5 that match each other, so that the area of ​​the air guide channel 8 can be maximized. In addition, a positioning portion for circumferential positioning of the air guide tube 2 is also provided on the inner wall of the muffle 1.

[0025] like Figure 2 As shown, two groups of positioning parts are provided and are symmetrically distributed on the inner walls on both sides of the muffle 1, and the positioning part includes two positioning plates 3, the distance between the two positioning plates 3 is slightly larger than the thickness of the anti-top block 5, and the space between the two positioning plates 3 is used for any anti-top block 5 to be inserted, so any anti-top block 5 is inserted between the two positioning plates 3, which can limit the circumference of the air guide tube 2 and improve the stability of the air guide tube 2.

[0026] In this embodiment, it can be known that the air guide tube 2 can be suspended in the muffle 1 by the reverse top and the support part, and the air guide tube 2 is also determined by the positioning part in the muffle 1. The circumferential position of the air guide tube 2 is ensured, and the stability of the placement of the air guide tube 2 is ensured. The outer ring of the air guide tube 2 is concentrically installed with the retaining ring 7 through the reverse top block 5, ensuring that the air guide tube 2 is placed on the fixed block with sufficient stability. The air guide tube 2 is seated on the fixed block of the muffle 1 through the reverse top block 5, so that the air guide channel 8 occupies a larger area on the radial plane of the muffle 1. Compared with the existing pit-type nitriding furnace, the pit-type nitriding furnace of this scheme can greatly improve the flow performance of the atmosphere gas.

[0027] In this embodiment, the support portion is a fixed block, which is distributed in an annular manner on the inner wall of the muffle 1, and the reverse top is a reverse top block 5, which is distributed in an annular manner on the outer surface of the air guide 2. The top of the fixed block is provided with a limiting groove 61, and the bottom end of each reverse top block 5 is placed in the corresponding limiting groove 61. Further, as Figure 1 and 2 As shown, a retaining ring 7 is sleeved on the air guide tube 2, and the inner wall of the retaining ring 7 is fixedly connected to the air guide tube 2 through the anti-top block 5, and the bottom of the retaining ring 7 is against the limiting groove 61. All limiting grooves 61 limit the outer periphery of the retaining ring 7 according to an annular distribution. The air guide tube 2 is limited in the vertical direction by the abutment of the anti-top block 5 and the fixed block, and is limited in the horizontal direction by the connection between the retaining ring 7 and the limiting groove 61. The retaining ring 7 is concentrically arranged with the air guide tube 2 to ensure that the air guide tube 2 can be located at the center of the muffle 1, thereby ensuring the uniformity of gas circulation around the air guide tube 2.

[0028] Another example Figure 1 As shown, the air guide channel 8 of this embodiment is surrounded by the inner wall of the muffle 1, the outer wall of the air guide cylinder 2, and two adjacent mutually cooperating fixed blocks and the anti-top block 5. After the muffle 1 is installed, the air guide channel 8 is opened between the adjacent fixed blocks and the anti-top block 5, which can reduce the occupation of the radial area of ​​the muffle 1 and improve the circulation performance of the atmosphere gas through the air guide channel 8.

[0029] The present invention is described above in conjunction with specific implementation methods, but those skilled in the art should be aware that these descriptions are exemplary and are not limitations on the scope of protection of the present invention, and that those skilled in the art can make various variations and modifications to the present invention based on the spirit and principles of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims

1. A support mechanism for an air duct of a pit-type nitriding furnace, comprising a muffle (1) and an air duct (2), characterized in that: A support portion is provided on the inner wall of the muffle (1), a counter-top is provided on the outer facade of the top of the air guide tube (2), the air guide tube (2) is suspended in the muffle (1) by the counter-top abutting against the support portion, an air guide channel (8) is left between the support portion and the counter-top, and a positioning portion for circumferential positioning of the air guide tube (2) is also provided on the inner wall of the muffle (1).

2. The air guide tube support mechanism of the pit type nitriding furnace according to claim 1, characterized in that: The support portion is a fixed block, the fixed blocks are distributed at intervals in a ring shape on the inner wall of the muffle (1), the reverse top portion is a reverse top block (5), the reverse top blocks (5) are distributed at intervals in a ring shape on the outer surface of the air guide tube (2), the top of each fixed block is provided with a limiting groove (61), and the bottom end of each reverse top block (5) is placed in the corresponding limiting groove (61).

3. The air guide tube support mechanism of the pit type nitriding furnace according to claim 1 or 2, characterized in that: The positioning part is provided with at least one group, and the positioning part comprises two positioning plates (3), the distance between the two positioning plates (3) is slightly greater than the thickness of the anti-top block (5), and any anti-top block (5) is inserted between the two positioning plates (3).

4. The air guide tube support mechanism of the pit type nitriding furnace according to claim 1 or 2, characterized in that: The air guide channel (8) is surrounded by the inner wall of the muffle (1), the outer wall of the air guide cylinder (2), and two adjacent mutually cooperating fixing blocks and a counter-top block (5).

5. The air guide tube support mechanism of the pit type nitriding furnace according to claim 2, characterized in that: A retaining ring (7) is sleeved on the air guide tube (2); the inner wall of the retaining ring (7) is fixedly connected to the air guide tube (2) via a counter-top block (5); and the bottom of the retaining ring (7) abuts against the limiting groove (61).

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