Thermal expansion displacement gradient adjusting structure for air pipe of annealing kiln

Abstract

The invention discloses an annealing kiln air pipe thermal expansion displacement gradient adjusting structure in the technical field of annealing kiln hot air discharging, and the structure comprises a main path rigid air pipe which is arranged in the transverse direction and communicates with an exhaust pipe; the branch rigid air pipe comprises a transverse section and a vertical section which are vertically connected; an air outlet of the fan is formed in the transverse direction and is fixedly connected with the transverse section through a telescopic connecting piece; the main path rigid air pipe comprises rigid pipe sections and corrugated pipe sections, the multiple rigid pipe sections and the multiple corrugated pipe sections are alternately arranged in the transverse direction and fixedly connected, and the top ends of the vertical sections are fixedly connected with the rigid pipe sections. The metal corrugated pipe is used for carrying out thermal expansion counteracting on the rigid air pipe at the top of the annealing kiln, and displacement deviation caused by thermal expansion of the rigid air pipe at the top of the annealing kiln is adjusted in a multi-gradient mode, so that the phenomenon of hot air dissipation is avoided, and the influences on the factory operation environment, the annealing kiln performance and energy consumption are effectively reduced or eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of hot air exhaust from an annealing furnace, and in particular to a thermal expansion displacement gradient regulating structure for an annealing furnace air duct. Background Art

[0002] The purpose of the annealing furnace is to create a uniform temperature field, ensure that the cooling rate of the glass ribbon in each zone in the annealing furnace forms a controlled cooling process, so that the compressive stress is gradually reduced in a controlled manner, and the problems of vertical explosion, horizontal explosion, cutting defects, etc. of the glass are reduced. The side electric heating system and cooling air system of the annealing furnace can effectively control the cooling rate of each zone of the annealing furnace. From the perspective of energy saving and consumption reduction, part of the high-temperature gas (hereinafter referred to as hot air) collected from the insulation zone of the annealing furnace needs to be matched with a certain amount of cooling air to flow back to the annealing furnace in a radiant countercurrent manner.

[0003] like Figure 3 and Figure 4 As shown, in actual production activities, an exhaust duct 50 connected to the fan 30 is installed on the top of the annealing kiln of each production line. The air outlet end (top end) of the exhaust duct 50 extends out of the wall or the roof separately. The diameter of the exhaust duct 50 is about 400 mm. A canvas soft connection is made between the air outlet of the fan 30 and the bottom end of the exhaust duct 50 to absorb the displacement of the exhaust duct 50 caused by thermal expansion.

[0004] With the development and application of photovoltaic glass curtain walls on the roofs and facades of industrial plants, the method of extending multiple exhaust ducts from the wall or roof separately is no longer suitable for photovoltaic integral curtain walls. The workshop can only connect the branch ducts on multiple annealing kilns to a large-diameter main duct and then connect them out of the factory. The diameter of the main duct is about 1400mm based on the heat-inducing air volume. However, in actual production applications, the canvas connecting the branch duct and the fan outlet frequently tears, causing hot air to escape into the factory, which not only leads to a poor factory operating environment, but also seriously affects the performance and energy consumption of the annealing kiln.

[0005] Therefore, how to avoid the occurrence of tearing of the connecting canvas between the branch air duct and the fan outlet has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide an annealing kiln air duct thermal expansion displacement gradient adjustment structure to solve the technical problem that the existing main air duct centralized exhaust method is prone to tearing of the connecting canvas between the branch air duct and the fan outlet.

[0007] The technical solution adopted by the present invention is: a thermal expansion displacement gradient adjustment structure of an annealing kiln air duct, comprising:

[0008] A main rigid air duct, the main rigid air duct is arranged in a transverse direction, and the air outlet end of the main rigid air duct is connected to the exhaust pipe;

[0009] A branch rigid air duct, the branch rigid air duct comprising a transverse section and a vertical section, one end of the transverse section being fixedly connected to the bottom end of the vertical section;

[0010] A fan, wherein the air outlet of the fan is arranged in the transverse direction, and the air outlet of the fan is fixedly connected to the other end of the transverse section through a telescopic connecting piece;

[0011] Among them, the main rigid air duct includes a rigid pipe section and a corrugated pipe section, a plurality of the rigid pipe sections and a plurality of the corrugated pipe sections are alternately arranged and fixedly connected along the transverse direction, and the top end of the vertical section is fixedly connected to the rigid pipe section.

[0012] Preferably, the air outlet direction of the fan is opposite to the flow direction of the hot air inside the main rigid air duct.

[0013] Preferably, along the flow direction of the hot air inside the main rigid air duct, the radial dimension of the main rigid air duct gradually increases.

[0014] Preferably, along the flow direction of the hot air inside the main rigid air duct, the flow speed of the hot air inside the plurality of branch rigid air ducts gradually increases, and the flow speed of the hot air inside the main rigid air duct gradually decreases.

[0015] Preferably, the vertical sections are fixedly connected to the rigid pipe sections in a one-to-one correspondence.

[0016] Preferably, the branch rigid air duct further includes a longitudinal section, one end of the longitudinal section is fixedly connected to the top end of the vertical section, and the other end of the longitudinal section is connected to the rigid pipe section.

[0017] Preferably, the branch rigid air ducts are located on both sides of the main rigid air duct in the longitudinal direction.

[0018] Preferably, along the flow direction of the hot air inside the main rigid air duct, the branch rigid air duct is connected to the downstream end of the rigid pipe section.

[0019] Preferably, the telescopic connector is a canvas flexible connector; and the bellows section is a metal bellows.

[0020] Preferably, a valve is provided on the transverse section.

[0021] Beneficial effects of the present invention:

[0022] The present invention arranges the main rigid air duct into rigid pipe sections and corrugated pipe sections that are alternately arranged and fixedly connected in the transverse direction. After the hot air inside the branch rigid air ducts is collected into the main rigid air duct, the transverse expansion displacement of each rigid pipe section can be offset by the multi-gradient transverse extrusion deformation of each corrugated pipe section under the action of external force, thereby avoiding the stacking effect of the expansion displacement of each rigid pipe section, thereby reducing the lateral displacement of each branch rigid air duct fixedly connected to the main rigid air duct. Combined with the transverse arrangement of the fan outlet and the offsetting effect of the telescopic connection between the fan outlet and the branch rigid air duct on the lateral displacement of the branch rigid air duct, radial displacement between the fan outlet and the branch rigid air duct and the occurrence of hot air escape can be effectively avoided, thereby effectively reducing or eliminating the impact on the factory operating environment, annealing kiln performance and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a plan view of the thermal expansion displacement gradient adjustment structure of the annealing furnace air duct of the present invention;

[0024] Figure 2 It is the AA section layout diagram of the thermal expansion displacement gradient adjustment structure of the annealing furnace air duct of the present invention;

[0025] Figure 3 It is the plan layout of the exhaust pipe of the existing annealing kiln;

[0026] Figure 4 This is the BB section layout diagram of the exhaust duct of the existing annealing kiln.

[0027] Description of reference numerals in the figures:

[0028] 10. Main road rigid air duct;

[0029] 11. Rigid pipe section; 12. Corrugated pipe section;

[0030] 20. Branch rigid duct;

[0031] 21. Horizontal section; 22. Vertical section; 23. Longitudinal section; 24. Valve;

[0032] 30. Fan;

[0033] 40. Telescopic connector;

[0034] 50. Exhaust duct;

[0035] 60. Annealing kiln. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0040] In actual production activities, when the main air duct centralized exhaust method is adopted, the closer to the outlet end of the main air duct, the easier it is for the canvas to tear and hot air to escape. After long-term research, the inventor believes that: when the annealing kiln has been running for a period of time, the outlet end of the main air duct will expand due to heat and will have a large expansion displacement (the stacking effect of the expansion displacement of each section of the main air duct), and the fixed connection of each branch air duct to the main air duct will cause each branch air duct to follow the main air duct to have different degrees of displacement, that is, the closer to the outlet end of the main air duct, the greater the lateral follow-up displacement of the branch air duct. In addition, the air outlet of the fan on the top of the existing annealing kiln is to exhaust air upwards, and the canvas soft connection connected between the air outlet of the fan and the branch air duct can only offset the vertical displacement of the branch air duct (the axial direction of the branch air duct), and cannot offset the lateral displacement of the branch air duct (the radial direction of the branch air duct), which leads to the occurrence of canvas tearing and hot air escape.

[0041] Examples, such as Figure 1 and Figure 2 As shown, a thermal expansion displacement gradient adjustment structure of an annealing kiln air duct includes: a main rigid air duct 10, a branch rigid air duct 20 and a fan 30.

[0042] The main rigid air duct 10 is disposed above the annealing furnace 60 in the transverse direction, and the air outlet end of the main rigid air duct 10 is communicated with the exhaust duct 50 .

[0043] There are multiple branch rigid air ducts 20 , and each branch rigid air duct 20 includes a transverse section 21 and a vertical section 22 . One end of the transverse section 21 is fixedly connected to the bottom end of the vertical section 22 .

[0044] There are multiple fans 30 , and the fans 30 are fixedly installed on the top of the annealing furnace 60 . The air outlet of the fan 30 is arranged in the transverse direction, and the air outlet of the fan 30 is fixedly connected to the other end of the transverse section 21 through a telescopic connection 40 .

[0045] Among them, the main rigid air duct 10 includes a rigid pipe section 11 and a corrugated pipe section 12, and multiple rigid pipe sections 11 and multiple corrugated pipe sections 12 are alternately arranged and fixedly connected in the transverse direction. The top end of the vertical section 22 is fixedly connected to the rigid pipe section 11, so that the corrugated pipe section 12 is axially compressed by the lateral extrusion of the corrugated pipe section 12 by the rigid pipe section 11, thereby realizing the gradient adjustment of the thermal expansion displacement of the main rigid air duct 10 in the transverse direction, thereby reducing the displacement of the end of the main rigid air duct 10 in the transverse direction.

[0046] The present invention arranges the main rigid air duct 10 into rigid pipe sections 11 and corrugated pipe sections 12 alternately arranged and fixedly connected in the transverse direction. After the hot air inside each branch rigid air duct 20 is collected into the main rigid air duct 10, the transverse extrusion deformation gradient of each corrugated pipe section 12 under the action of external force can be used to offset the transverse expansion displacement of each rigid pipe section 11, thereby avoiding the stacking effect of the expansion displacement of each rigid pipe section 11, thereby reducing the lateral displacement of each branch rigid air duct 20 fixedly connected to the main rigid air duct 10. Combined with the transverse arrangement of the air outlet of the fan 30 and the offsetting effect of the telescopic connection 40 between the air outlet of the fan 30 and the branch rigid air duct 20 on the lateral displacement of the branch rigid air duct 20, radial displacement between the air outlet of the fan 30 and the branch rigid air duct 20 and the occurrence of hot air escape can be effectively avoided, thereby effectively reducing or eliminating the impact on the factory operating environment, annealing kiln performance and energy consumption.

[0047] It should be noted that the lateral direction in the present invention refers to Figure 1 and Figure 3 The double arrow direction in the figure is the direction in which the glass moves in the annealing furnace. Figure 1 and Figure 3 In the figure, the glass moves from right to left, the hot air flows from right to left, and the longitudinal direction refers to Figure 1 and Figure 3 The single arrow direction.

[0048] Specific embodiment 1, as Figure 2As shown, a thermal expansion displacement gradient adjustment structure of an annealing kiln air duct includes: a main rigid air duct 10, a branch rigid air duct 20, a fan 30 and an exhaust duct 50.

[0049] The number of the main rigid air duct 10 is one, and the main rigid air duct 10 is arranged directly above the annealing furnace 60 along the lateral direction.

[0050] The exhaust duct 50 is horizontally arranged along the longitudinal direction, and one end of the exhaust duct 50 located in the factory is fixedly connected to the air outlet end of the main rigid air duct 10 for exhausting the hot air inside the main rigid air duct 10.

[0051] The main rigid air duct 10 includes a rigid pipe section 11 and a corrugated pipe section 12 . A plurality of rigid pipe sections 11 and a plurality of corrugated pipe sections 12 are alternately arranged in the transverse direction and coaxially fixedly connected, that is, each corrugated pipe section 12 is fixedly connected between two rigid pipe sections 11 .

[0052] There are multiple branch rigid air ducts 20, and each branch rigid air duct 20 includes a transverse section 21 and a vertical section 22. One end of the transverse section 21 is fixedly connected to the bottom end of the vertical section 22, and the top end of the vertical section 22 is fixedly connected to the rigid pipe section 11, so as to collect the hot air in the branch rigid air duct 20 into the main rigid air duct 10.

[0053] Specifically, the branch rigid air duct 20 includes a branch rigid air duct 20 with a diameter of 550 mm installed in zone A of the annealing kiln, a branch rigid air duct 20 with a diameter of 350 mm installed in zone B of the annealing kiln, and a branch rigid air duct 20 with a diameter of 450 mm installed in zone C of the annealing kiln. The flow velocity of the hot air inside the branch rigid air duct 20 in zone A of the annealing kiln is 14.1 m / s, the flow velocity of the hot air inside the branch rigid air duct 20 in zone B of the annealing kiln is 15.6 m / s, and the flow velocity of the hot air inside the branch rigid air duct 20 in zone C of the annealing kiln is 15.7 m / s.

[0054] There are multiple fans 30, and the fans 30 are fixedly installed on the top of the annealing furnace 60. The air outlet of the fan 30 is arranged in the transverse direction. The air outlet of the fan 30 is fixedly connected to the other end of the transverse section 21 through the telescopic connection 40, so that the hot air in the annealing furnace 60 enters the branch rigid air duct 20, and the air outlet direction of the fan 30 is opposite to the flow direction of the hot air in the main rigid air duct 10, so that the telescopic connection 40 can offset the lateral follow-up movement of the transverse section 21 caused by the thermal expansion of the main rigid air duct 10, and further avoid the occurrence of hot air escape.

[0055] Preferably, Figure 2As shown, the radial dimension of the main rigid air duct 10 gradually increases along the hot air flow direction, that is, from right to left, the radial dimension of the main rigid air duct 10 gradually increases, or from right to left, the radial dimension of each rigid pipe section 11 gradually increases; for example, Figure 2 The radial dimensions of the six rigid pipe segments 11 connected in sequence from right to left are 600mm, 900mm, 1000mm, 1100, 1250mm and 1400mm, and from right to left, the flow velocities of the hot air inside the six rigid pipe segments 11 are 11.7m / s, 10.4m / s, 10.4m / s, 10.1m / s, 9.9m / s and 9.5m / s.

[0056] This is because: from right to left, the hot air in each branch rigid air duct 20 is gradually merged into the main rigid air duct 10. In the annealing furnace A area, the hot air volume is 12000m 3 / h, the hot air temperature is 600±10℃, in the annealing furnace B area, the hot air volume is 5400m 3 / h, the hot air temperature is 480±10℃, in the annealing furnace C zone, the hot air volume is 9000m 3 / h, the hot air temperature is 370±10℃, in order to make the hot air enter the main rigid air duct 10 to flow unidirectionally and stably, the hot air flow direction is guided to be consistent with the forward direction of the glass, to avoid turbulence and backflow into the annealing furnace, and to ensure the efficiency of hot air discharge. In the present invention, from right to left, the radial size of the main rigid air duct 10 gradually increases. According to the Bernoulli equation and the equation corresponding to the air duct diameter and flow velocity, the air duct diameter is gradually increased and the fluid flow velocity is reduced, which can ensure that the hot air flows unidirectionally and stably in the main rigid air duct 10 along the forward direction of the glass. Compared with the air duct with equal radius, the turbulence phenomenon inside the main rigid air duct 10 and the backflow of hot air into the annealing furnace can be avoided.

[0057] More preferably, a valve 24 is provided on the transverse section 21 , and the valve 24 is used to control the on-off of the branch rigid air duct 20 .

[0058] Specific embodiment 2, as Figure 1 and Figure 2 As shown, a thermal expansion displacement gradient adjustment structure of an annealing kiln air duct includes: a main rigid air duct 10, a branch rigid air duct 20, a fan 30 and an exhaust duct 50.

[0059] The number of the main rigid air duct 10 is one, and the main rigid air duct 10 is arranged on the upper side of the two annealing kilns 60 in the transverse direction; the air inlet end of the main rigid air duct 10 is connected with the branch rigid air duct 20, and the air outlet end of the main rigid air duct 10 is connected with the exhaust duct 50, that is, the right end of the main rigid air duct 10 is closed or connected with the branch rigid air duct 20, and the left end of the main rigid air duct 10 is connected with one end (longitudinal end) of the exhaust duct 50 located in the factory building, so that the hot air flowing into the main rigid air duct 10 flows in the main rigid air duct 10 in the transverse direction.

[0060] Specifically, the main rigid air duct 10 is hoisted directly above the annealing furnace 60 through a U-shaped frame.

[0061] The exhaust duct 50 is arranged in the longitudinal direction, with one end of the exhaust duct 50 located inside the factory building and the other end located outside the factory building. One end of the exhaust duct 50 is vertically connected to the main rigid air duct 10 for exhausting the hot air in the main rigid air duct 10.

[0062] Specifically, the lateral dimension of the installation and fixing hole on the factory wall for installing the exhaust duct 50 is larger than the radial dimension of the exhaust duct 50, so as to allow the exhaust duct 50 to undergo lateral following displacement under the action of thermal expansion of the main rigid air duct 10. The right end of the main rigid air duct 10 needs to be laterally limited to prevent the main rigid air duct 10 from moving to the right under the action of thermal expansion.

[0063] The main rigid air duct 10 includes a rigid pipe section 11 and a corrugated pipe section 12. A plurality of rigid pipe sections 11 and a plurality of corrugated pipe sections 12 are alternately arranged in the transverse direction and can be fixedly connected, that is, the rigid pipe section 11 and the corrugated pipe section 12 are coaxially arranged and fixedly connected.

[0064] There are multiple branch rigid air ducts 20, and each branch rigid air duct 20 includes a transverse section 21, a vertical section 22 and a longitudinal section 23. One end of the longitudinal section 23 is fixedly connected to the top of the vertical section 22, the other end of the longitudinal section 23 is fixedly connected to the rigid pipe section 11, and the bottom end of the vertical section 22 is fixedly connected to one end of the transverse section 21, so as to collect the hot air in the branch rigid air duct 20 into the main rigid air duct 10.

[0065] There are multiple fans 30, and the fans 30 are fixedly installed on the top of the annealing kiln 60. The air outlet of the fan 30 is arranged along the transverse direction. The air outlet of the fan 30 is fixedly connected to the other end of the transverse section 21 through a canvas soft connection, so that the hot air in the annealing kiln 60 enters the branch rigid air duct 20.

[0066] Preferably, the longitudinal section 23 is fixedly connected to the rigid pipe section 11 in a one-to-one correspondence, and along the flow direction of the hot air inside the main rigid air duct 10, the longitudinal section 23 of the branch rigid air duct 20 is fixedly connected to the downstream end of the rigid pipe section 11.

[0067] More preferably, the branch rigid air duct 20 is located on both longitudinal sides of the main rigid air duct 10, that is, the main rigid air duct 10 is located between the two annealing kilns 60, and the main rigid air duct 10 is connected to the fans 30 on the top of the two annealing kilns 60 through multiple branch rigid air ducts 20.

[0068] More preferably, the bellows section 12 is a metal bellows.

[0069] The working principle of the gradient adjustment structure of the present invention is as follows:

[0070] The hot air from each zone of the annealing furnace 60 enters the branch rigid air duct 20 through the air outlet of each fan 30, the canvas soft connection, and the valve 24. After the hot air in each branch rigid air duct 20 is collected into the main rigid air duct 10, the rigid pipe sections 11 of each main rigid air duct 10 expand due to heat and axially squeeze the corrugated pipe sections 12. The extrusion and deformation of each corrugated pipe section 12 can offset the lateral expansion displacement of the adjacent rigid pipe sections 11, and then gradually digest the expansion displacement of the main rigid air duct 10 in the lateral direction, avoiding the stacking effect of the expansion displacement of the main rigid air duct 10, and reducing the lateral expansion displacement of the air outlet end of the main rigid air duct 10.

[0071] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0072] The present invention utilizes a metal bellows to offset the thermal expansion of a rigid air duct on the top of an annealing kiln, and adjusts the displacement deviation of the rigid air duct on the top of the annealing kiln due to thermal expansion in multiple gradients, thereby preventing the connecting canvas between the fan and the air duct from being torn, thereby avoiding the occurrence of hot air escape, and effectively reducing or eliminating the impact on the factory operating environment, annealing kiln performance and energy consumption.

[0073] The gradient adjustment structure of the present invention has the advantages of simple structure, low cost, high feasibility and high economic benefit.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A thermal expansion displacement gradient adjustment structure for an annealing furnace air duct, characterized in that: include: A main rigid air duct (10), wherein the main rigid air duct (10) is arranged in a transverse direction, and an air outlet end of the main rigid air duct (10) is connected to an exhaust pipe (50); A branch rigid air duct (20), the branch rigid air duct (20) comprising a transverse section (21) and a vertical section (22), one end of the transverse section (21) being fixedly connected to the bottom end of the vertical section (22); A fan (30), wherein the air outlet of the fan (30) is arranged in the transverse direction, and the air outlet of the fan (30) is fixedly connected to the other end of the transverse section (21) via a telescopic connecting piece (40); The main rigid air duct (10) comprises a rigid pipe section (11) and a corrugated pipe section (12); a plurality of the rigid pipe sections (11) and a plurality of the corrugated pipe sections (12) are alternately arranged in a transverse direction and fixedly connected; and the top end of the vertical section (22) is fixedly connected to the rigid pipe section (11).

2. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 1, characterized in that: The air outlet direction of the fan (30) is opposite to the flow direction of the hot air inside the main rigid air duct (10).

3. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 2, characterized in that: Along the flow direction of the hot air inside the main rigid air duct (10), the radial dimension of the main rigid air duct (10) gradually increases.

4. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 3 is characterized in that: Along the flow direction of the hot air inside the main rigid air duct (10), the flow speed of the hot air inside the plurality of branch rigid air ducts (20) gradually increases, and the flow speed of the hot air inside the main rigid air duct (10) gradually decreases.

5. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 1, characterized in that: The vertical section (22) is fixedly connected to the rigid pipe section (11) in a one-to-one correspondence.

6. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 5, characterized in that: The branch rigid air duct (20) further comprises a longitudinal section (23), one end of the longitudinal section (23) is fixedly connected to the top end of the vertical section (22), and the other end of the longitudinal section (23) is connected to the rigid pipe section (11).

7. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 6, characterized in that: The branch rigid air ducts (20) are located on both sides of the main rigid air duct (10) in the longitudinal direction.

8. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 7, characterized in that: Along the flow direction of the hot air inside the main rigid air duct (10), the branch rigid air duct (20) is connected to the downstream end of the rigid pipe section (11).

9. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 1, characterized in that: The telescopic connection piece (40) is a canvas flexible connection; and the bellows section (12) is a metal bellows.

10. The thermal expansion displacement gradient adjustment structure of the annealing furnace air duct according to claim 1, characterized in that: The transverse section (21) is provided with a valve (24).

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