A type of well furnace guide tube

Abstract

This utility model relates to a guide tube for a pit furnace, belonging to the technical field of metal heat treatment equipment. It solves the problem in existing pit furnaces where the fit and sealing between the upper and lower guide tube assemblies are poor, and the furnace cover cannot be opened and closed normally after the guide tube deforms due to heat, affecting furnace temperature uniformity. This utility model includes an upper guide tube assembly and a lower guide tube assembly. The upper guide tube assembly includes an upper guide tube and a movable skirt disposed at the lower part of the upper guide tube; the movable skirt can open and close. The lower guide tube assembly includes a lower guide tube and a flared structure disposed at the upper part of the lower guide tube; the movable skirt can extend into the flared structure, so that the edge of the movable skirt contacts the inner wall surface of the flared structure to seal the furnace body. This utility model can improve the fit and sealing between the upper and lower guide tubes.

Description

Technical Field

[0001] This utility model relates to the technical field of metal heat treatment equipment, and in particular to a well furnace guide tube. Background Technology

[0002] In the field of metal heat treatment, pit-type heat treatment furnaces are frequently used for heat treatment of metal rods and long shafts. To achieve higher furnace temperature uniformity, circulating fans and flow guiding systems are installed, with the flow guiding system organizing the flow field.

[0003] Some pit-type furnaces have an upper guide tube assembly on the furnace cover and a lower guide tube assembly at the bottom. The upper guide tube assembly is movable, while the lower guide tube assembly is fixed. During production, after the furnace cover is placed on the furnace body, the fit and seal between the upper and lower guide tube assemblies are poor. When the guide tubes deform due to heat, the furnace cover cannot be opened and closed normally. Furthermore, the deformation causes excessive gaps at the connection between the upper and lower guide tubes, resulting in a "short circuit" of the circulating air and affecting the uniformity of furnace temperature. Utility Model Content

[0004] Based on the above analysis, the present invention aims to provide a movable skirt for the guide tube of a pit furnace, in order to solve the problems of poor fit and sealing between the upper and lower guide tube assemblies of the pit furnace, and the inability of the furnace cover to open and close normally after the guide tube is deformed by heat, thus affecting the uniformity of furnace temperature.

[0005] The objective of this utility model is mainly achieved through the following technical solutions:

[0006] A well-type furnace guide tube includes an upper guide tube assembly and a lower guide tube assembly;

[0007] The upper guide tube assembly includes an upper guide tube and a movable skirt disposed at the lower part of the upper guide tube; the movable skirt can be opened and closed; the lower guide tube assembly includes a lower guide tube and a flared mouth structure disposed at the upper part of the lower guide tube.

[0008] The movable skirt can extend into the flared structure, so that the edge of the movable skirt contacts the inner wall surface of the flared structure to seal the furnace body.

[0009] Furthermore, the movable skirt includes multiple movable skirt panels arranged circumferentially; each movable skirt panel includes a skirt panel body, a hinged end, and a free end;

[0010] The lower part of the upper guide tube is provided with a hinge shaft; the main body of the skirt plate can rotate around the hinge shaft.

[0011] Furthermore, the central axis of the hinge shaft is parallel to the central axis of the upper guide tube.

[0012] Furthermore, two adjacent movable skirt panels are stacked together.

[0013] Furthermore, the width of the movable skirt panel is 100-200mm and the length is 200-400mm; the overlap of two adjacent movable skirt panels is 20-30mm.

[0014] Furthermore, the upper guide tube assembly also includes a one-way stop structure, which is disposed between the free end of the movable skirt and the upper guide tube.

[0015] Furthermore, the upper guide tube assembly also includes a first reinforcing rib; the first reinforcing rib is disposed circumferentially at the lower opening of the upper guide tube.

[0016] Furthermore, the first reinforcing rib is a block structure; the first reinforcing rib is attached to the outer wall surface of the lower opening of the upper guide tube.

[0017] Furthermore, the lower guide tube assembly also includes an annular structure; the annular structure extends radially outward from the edge of the flared structure.

[0018] Furthermore, the lower guide tube assembly also includes a second reinforcing rib; the second reinforcing rib is an annular folded plate structure, and the second reinforcing rib is disposed on the outer wall surface of the flared mouth structure.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) Compared with the prior art, this utility model improves the structure of the connection between the upper and lower guide tubes. The lower part of the upper guide tube is provided with a movable skirt that can open and close; the upper part of the lower guide tube is provided with an outwardly expanding flared structure. When the upper and lower guide tubes are connected, the movable skirt extends into the inner wall of the flared structure. During the downward extension process, the gap between the movable skirt and the inner wall of the flared structure decreases and closes as the movable skirt opens and closes. When the guide tube is deformed by heat, the movable skirt allows the upper guide tube and the furnace cover to descend normally to the installation position; the movable skirt can automatically cooperate with the flared structure to reduce gaps and avoid the furnace cover being unable to open and close normally after the guide tube is deformed by heat, as well as the phenomenon of "short circuit" of circulating air due to excessive gap at the connection between the upper and lower guide tubes, which affects the uniformity of furnace temperature in the pit furnace.

[0021] (2) In this utility model, the movable skirt is composed of multiple movable skirt plates to increase the reliability of the connection; the movable skirt plate has a hinged end and a free end. The hinged end is hinged to the upper guide tube body to realize the opening and closing of the movable skirt plate; a one-way stop structure is provided between the free end and the upper guide tube body to ensure that the movable skirt plate absorbs deformation in one direction; the adjacent movable skirt plates are partially stacked to increase the sealing of the movable skirt plate and have a certain rigidity.

[0022] (3) To prevent or reduce deformation of the upper and lower guide tube openings, a first reinforcing rib is provided at the opening of the upper guide tube; a second reinforcing rib is provided on the outer wall of the flared structure of the lower guide tube, and an annular structure is provided at the opening.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0025] Figure 1 This is a front view of the guide tube of a pit furnace according to a specific embodiment;

[0026] Figure 2 A schematic diagram of the guide tube of the well furnace in a specific embodiment.

[0027] Figure label:

[0028] 1-Upper guide tube assembly, 11-Upper guide tube, 12-Modible skirt, 121-Modible skirt, 1211-Skirt body, 1212-Hinged end, 1213-Free end, 13-One-way stop structure, 14-First reinforcing rib, 2-Lower guide tube assembly, 21-Lower guide tube, 22-Flare structure, 23-Annular structure, 24-Second reinforcing rib. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] A specific embodiment of this utility model is as follows: Figure 1 As shown, a well-type furnace guide tube is disclosed, including an upper guide tube assembly 1 and a lower guide tube assembly 2;

[0031] The upper guide tube assembly 1 includes an upper guide tube 11 and a movable skirt 12 disposed at the lower part of the upper guide tube 11; the movable skirt 12 can be opened and closed; the lower guide tube assembly 2 includes a lower guide tube 21 and a flared mouth structure 22 disposed at the upper part of the lower guide tube 21.

[0032] The movable skirt 12 can extend into the flared structure 22, so that the edge of the movable skirt 12 contacts the inner wall of the flared opening to seal the furnace body.

[0033] Specifically, the upper guide tube assembly 1 is located at the lower part of the furnace cover and includes an upper guide tube 11 and a movable skirt 12. The movable skirt 12 is located around the opening of the upper guide tube 11 and can be opened and closed.

[0034] Preferably, to increase the reliability of the connection, the movable skirt 12 includes a plurality of movable skirt plates 121 arranged circumferentially.

[0035] The movable skirt 121 is hinged to the upper guide tube 11. Specifically, the movable skirt 121 includes a skirt body 1211, a hinge end 1212, and a free end 1213. A hinge shaft is provided at the lower part of the upper guide tube 11; the hinge end 1212 is connected to the hinge shaft, and multiple skirt bodies 1211 rotate around their own hinge shafts to realize the opening and closing of the movable skirt 12. For example, the axis of the hinge shaft is parallel to the central axis of the upper guide tube 11.

[0036] Furthermore, the upper guide tube assembly 1 also includes a one-way stop structure 13 to ensure that the movable skirt 12 absorbs deformation in one direction. The one-way stop structure 13 is disposed between the free end 1213 of the movable skirt 121 and the wall of the upper guide tube 11.

[0037] Furthermore, the adjacent movable skirt panels 121 are partially stacked to increase the sealing of the movable skirt 12 and give the movable skirt 12 a certain rigidity.

[0038] Specifically, in order to ensure the free movement and sealing effect of the skirt, the size of a single movable skirt 121 cannot be designed to be too large or too small. Depending on the diameter of the upper guide tube 11, the size of the skirt is set to be 100-200mm wide and 200-400mm long; the width of the overlapping part of two adjacent movable skirts 121 is 20-30mm.

[0039] To prevent or reduce deformation of the opening of the upper guide tube 11, a first reinforcing rib 14 is provided circumferentially at the opening of the upper guide tube 11. The first reinforcing rib 14 is a block structure and is attached to the outer wall surface of the lower opening of the upper guide tube 11.

[0040] like Figure 2 As shown, the lower guide assembly includes a lower guide cylinder 21 and a flared mouth structure 22 located on the upper part of the lower guide cylinder 21. To ensure smooth cooperation between the upper guide cylinder 11 and the lower guide cylinder 21 when the furnace cover is closed, the opening of the lower guide cylinder 21 is designed as a flared mouth structure 22.

[0041] To reduce the deformation of the lower guide tube 21, an annular structure 23 extends radially outward from the edge of the flared mouth structure 22, and a second reinforcing rib 24 is provided circumferentially on the outer wall surface of the flared mouth structure 22. The second reinforcing rib 24 is an annular folded plate structure.

[0042] When in use, when the upper guide tube 11 is connected downward to the lower guide tube 21, the movable skirt 12 extends into the flared structure 22 and gradually contacts the inner wall of the flared structure 22. As the movable skirt 12 opens and closes, the gap between the edge of the movable skirt 12 and the inner wall of the flared structure 22 decreases and closes.

[0043] Compared with the prior art, this embodiment improves the structure of the connection between the upper guide tube 11 and the lower guide tube 21. The lower part of the upper guide tube 11 is provided with a movable skirt 12, which can be opened and closed. The upper part of the lower guide tube 21 is provided with an outwardly expanding flared structure 22. When the upper guide tube 11 and the lower guide tube 21 are connected, the movable skirt 12 extends into the inner wall of the flared structure 22. During the downward extension process, as the movable skirt 12 opens and closes, the gap between it and the inner wall of the flared structure 22 decreases and closes. When the upper guide tube 11 and the lower guide tube 21 are deformed by heat, the movable skirt 12 allows the upper guide tube 11 and the furnace cover to descend normally to the installation position; the movable skirt 121 can automatically cooperate with the flared structure 22 to reduce gaps, avoid the furnace cover from being unable to open and close normally due to the heat deformation of the guide tube, and avoid the phenomenon of "short circuit" of circulating air due to excessive gap at the connection between the upper guide tube 11 and the lower guide tube 21, which affects the uniformity of furnace temperature of the pit furnace.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A well-type furnace guide tube, characterized in that, It includes an upper guide tube assembly (1) and a lower guide tube assembly (2); The upper guide tube assembly (1) includes an upper guide tube (11) and a movable skirt (12) disposed at the lower part of the upper guide tube (11); the movable skirt (12) can be opened and closed; the lower guide tube assembly (2) includes a lower guide tube (21) and a flared mouth structure (22) disposed at the upper part of the lower guide tube (21); The movable skirt (12) can extend into the flared structure (22) so that the edge of the movable skirt (12) contacts the inner wall surface of the flared structure (22) to seal the furnace body.

2. The well-type furnace guide tube according to claim 1, characterized in that, The movable skirt (12) includes a plurality of movable skirt panels (121) arranged circumferentially; the movable skirt panel (121) includes a skirt panel body (1211), a hinged end (1212) and a free end (1213); The upper guide tube (11) is provided with a hinge shaft at its lower part; the skirt body (1211) can rotate around the hinge shaft.

3. The well-type furnace guide tube according to claim 2, characterized in that, The central axis of the hinge shaft is parallel to the central axis of the upper guide tube (11).

4. The well-type furnace guide tube according to claim 2, characterized in that, The two adjacent movable skirt panels (121) are partially stacked.

5. The well-type furnace guide tube according to claim 4, characterized in that, The movable skirt panel (121) is 100-200mm wide and 200-400mm long; the overlapping part of two adjacent movable skirt panels (121) is 20-30mm wide.

6. The well-type furnace guide tube according to claim 2, characterized in that, The upper guide tube assembly (1) further includes a one-way stop structure (13), which is disposed between the free end (1213) of the movable skirt (121) and the upper guide tube (11).

7. The well-type furnace guide tube according to claim 1, characterized in that, The upper guide tube assembly (1) further includes a first reinforcing rib (14); the first reinforcing rib (14) is disposed circumferentially at the lower opening of the upper guide tube (11).

8. The well-type furnace guide tube according to claim 7, characterized in that, The first reinforcing rib (14) is a block structure; the first reinforcing rib (14) is attached to the outer wall surface of the lower opening of the upper guide tube (11).

9. The well-type furnace guide tube according to claim 1, characterized in that, The lower guide tube assembly (2) also includes an annular structure (23); the annular structure (23) extends radially outward from the edge of the flared structure (22).

10. The well-type furnace guide tube according to claim 9, characterized in that, The lower guide tube assembly (2) also includes a second reinforcing rib (24); the second reinforcing rib (24) is an annular folded plate structure, and the second reinforcing rib (24) is disposed on the outer wall surface of the flared mouth structure (22).

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