An air-cooled furnace roller used under high temperature conditions

Abstract

An air-cooled furnace roller used in a high-temperature state relates to the field of furnace rollers. The air-cooled furnace roller used in a high-temperature state comprises a furnace roller body, a fiber expansion layer wrapped around the outer wall of the furnace roller body, and a furnace roller outer casting material layer wrapped around the outer wall of the fiber expansion layer. A cooling hole is provided in the furnace roller body, and both ends of the furnace roller body are respectively connected with a rotary joint that can rotate relative to it, and the two rotary joints are respectively connected with a cooling gas inlet and a cooling gas outlet connected to the cooling hole. A plurality of air-cooled upper guide plates arranged at intervals along the length direction of the cooling hole are provided at the top of the cooling hole, and a plurality of air-cooled lower guide plates arranged at intervals along the length direction of the cooling hole are provided at the bottom of the cooling hole. The air-cooled upper guide plates and the air-cooled lower guide plates are alternately arranged along the length direction of the cooling hole. The air-cooled furnace roller used in a high-temperature state provided in the present application has the advantages of good use stability, low maintenance frequency, and little influence on the temperature in the furnace, and is suitable for industrial furnaces with temperatures above 1100°C and high requirements for furnace temperature uniformity.

Description

Technical Field

[0001] The present application relates to the field of furnace rollers, and in particular to an air-cooled furnace roller used under high temperature conditions. Background Art

[0002] Furnace rollers are components of material conveying devices commonly used in continuous industrial furnaces. They usually have to bear a certain weight for long-term use at high temperatures and cannot deform. Therefore, furnace rollers are mostly made of heat-resistant steel centrifugally cast, but the temperature at which heat-resistant steel can be used stably for a long time is below 1100°C. When industrial furnaces need to be produced at a process above 1100°C, heat-resistant steel furnace rollers cannot meet normal use, and additional cooling and heat insulation are required for the furnace rollers.

[0003] At present, water-cooled fiber rollers are usually used to meet the requirements of such high-temperature conditions. Although water-cooled fiber rollers can be used under high-temperature conditions, due to insufficient fiber strength, the fiber loss is large during the production process, and the fiber sleeve needs to be replaced frequently, which increases the cost of use and human resources. In addition, the cooling effect of water cooling is good, which will cause a temperature difference between the furnace roller surface and the furnace, thereby affecting the temperature field in the furnace. Utility Model Content

[0004] The purpose of the present application is to provide an air-cooled furnace roller for use under high temperature conditions, which has the advantages of good stability in use, low maintenance frequency, and little impact on the temperature inside the furnace. It is suitable for industrial furnaces with temperatures above 1100°C and high requirements for furnace temperature uniformity.

[0005] This application is implemented as follows:

[0006] The present application provides an air-cooled furnace roller used under high-temperature conditions, which comprises a furnace roller body, a fiber expansion layer wrapped around the outer wall of the furnace roller body and a furnace roller outer casting material layer wrapped around the outer wall of the fiber expansion layer. A cooling hole is arranged in the furnace roller body, and both ends of the furnace roller body are respectively connected with a rotating joint that can rotate relative to the furnace roller body, and the two rotating joints are respectively connected with a cooling gas inlet and a cooling gas outlet connected to the cooling hole. A plurality of air-cooled upper guide plates arranged at intervals along the length direction of the cooling hole are arranged at the top of the cooling hole, and a plurality of air-cooled lower guide plates arranged at intervals along the length direction of the cooling hole are arranged at the bottom of the cooling hole, and the air-cooled upper guide plates and the air-cooled lower guide plates are alternately arranged along the length direction of the cooling hole.

[0007] In some optional embodiments, at least one convection hole is respectively provided on the air-cooled upper guide plate and the air-cooled lower guide plate.

[0008] In some optional embodiments, a fixed rod coaxially arranged therewith is fixed in the cooling hole, and a plurality of truncated cone-shaped drainage seats are sleeved on the fixed rod, and the outer diameter of the drainage seat gradually increases as it moves away from the cooling gas inlet.

[0009] In some optional embodiments, at least one drainage seat is provided between each air-cooled upper guide plate and the adjacent air-cooled lower guide plate.

[0010] In some optional implementation schemes, the air-cooled upper guide plate and the air-cooled lower guide plate are both semicircular plates, and the fixing rods are respectively connected to each air-cooled upper guide plate and each air-cooled lower guide plate.

[0011] In some optional embodiments, a truncated cone-shaped flow guide portion is connected to one end of the flow guide seat away from the cooling gas inlet, and the outer diameter of the flow guide portion gradually decreases as it moves away from the cooling gas inlet.

[0012] In some optional embodiments, at least one reinforcing rib is connected between the air-cooled upper guide plate and the air-cooled lower guide plate and the furnace roller body respectively.

[0013] In some optional embodiments, the reinforcing ribs are connected to the fixing rods.

[0014] In some optional embodiments, both ends of the fixing rod are connected to the furnace roller body through a plurality of reinforcing rods.

[0015] The beneficial effects of the present application are as follows: the air-cooled furnace roller used in a high temperature state provided by the present application comprises a furnace roller body, a fiber expansion layer wrapped on the outer wall of the furnace roller body, and a furnace roller outer casting material layer wrapped on the outer wall of the fiber expansion layer, a cooling hole is provided in the furnace roller body, and the two ends of the furnace roller body are respectively connected with a rotating joint that can rotate relative to it, and the two rotating joints are respectively connected with a cooling gas inlet and a cooling gas outlet connected to the cooling hole, and a plurality of air-cooled upper guide plates arranged at intervals along the length direction of the cooling hole are provided at the top of the cooling hole, and a plurality of air-cooled lower guide plates arranged at intervals along the length direction of the cooling hole are provided at the bottom of the cooling hole, and the air-cooled upper guide plates and the air-cooled lower guide plates are alternately arranged along the length direction of the cooling hole. The air-cooled furnace roller used in a high temperature state provided by the present application has the advantages of good use stability, low maintenance frequency, and little influence on the temperature in the furnace, and is suitable for industrial furnaces with a temperature higher than 1100°C and high furnace temperature uniformity requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A partial perspective structural diagram of an air-cooled furnace roller used under high temperature conditions provided in Example 1 of the present application;

[0018] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure of the AA section line;

[0019] Figure 3 A schematic diagram of the structure of an air-cooled upper guide plate in an air-cooled furnace roller used under high temperature conditions provided in Example 1 of the present application;

[0020] Figure 4 A partial perspective structural diagram of an air-cooled furnace roller used under high temperature conditions provided in Example 2 of the present application;

[0021] Figure 5 A partial perspective structural diagram of an air-cooled furnace roller used under high temperature conditions provided in Example 3 of the present application;

[0022] Figure 6 This is a partial perspective structural schematic diagram of an air-cooled furnace roller used under high temperature conditions provided in Example 4 of the present application.

[0023] In the figure: 100, furnace roller body; 110, fiber expansion layer; 120, furnace roller outer casting layer; 130, cooling hole; 140, rotary joint; 150, cooling gas inlet; 160, cooling gas outlet; 170, air-cooled upper guide plate; 180, air-cooled lower guide plate; 190, convection hole; 200, fixing rod; 210, drainage seat; 220, guide part; 230, reinforcing rib; 240, reinforcing rod; 250, groove. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The characteristics and performance of the air-cooled furnace rollers used in the high temperature state of the present application are further described in detail below in conjunction with the embodiments.

[0032] Example 1

[0033] like Figure 1 , Figure 2 and Figure 3As shown, the embodiment of the present application provides an air-cooled furnace roller used under high temperature conditions, which includes a furnace roller body 100, a fiber expansion layer 110 wrapped around the outer wall of the furnace roller body 100, and a furnace roller outer casting material layer 120 wrapped around the outer wall of the fiber expansion layer 110. The furnace roller body 100 is provided with a cooling hole 130 extending along its axial direction. The two ends of the furnace roller body 100 are respectively connected to a rotating joint 140 that can rotate relative to its axis. The two rotating joints 140 are respectively connected to a cooling gas inlet 150 and a cooling gas outlet 160 that are connected to the cooling hole 130. The cooling hole 130 is provided with a cooling hole 140 that is connected to the outer wall of the furnace roller body 100. Five semicircular upper air-cooling guide plates 170 are arranged at intervals along the length direction at the top of the cooling hole 30, and five semicircular lower air-cooling guide plates 180 are arranged at intervals along the length direction at the bottom of the cooling hole 130. The five upper air-cooling guide plates 170 and the five lower air-cooling guide plates 180 are alternately arranged along the length direction of the cooling hole 130, and three convection holes 190 are respectively opened on each upper air-cooling guide plate 170 and each lower air-cooling guide plate 180, and the center of each upper air-cooling guide plate 170 and each lower air-cooling guide plate 180 is depressed to form a semicircular groove 250.

[0034] The air-cooled furnace roller used in a high temperature state provided in the embodiment of the present application is obtained by centrifugal casting of heat-resistant steel to obtain a furnace roller body 100. The outer wall of the furnace roller body 100 is coated with a furnace roller outer casting layer 120 for heat insulation. In order to prevent the furnace roller body 100 from being damaged by expansion due to different expansion coefficients of internal and external materials after thermal expansion, a fiber expansion layer 110 for expansion is arranged between the furnace roller body 100 and the furnace roller outer casting layer 120. Compared with water cooling, air cooling has the advantage of a compromise in cooling methods. Its cooling purpose is to ensure that the temperature of the furnace roller body 100 does not exceed its normal operating temperature and that the temperature difference between the furnace roller body 100 and the furnace temperature is not too large. In addition, the insulation effect of the furnace roller outer casting layer 120 will not affect the uniformity of the furnace temperature in the furnace. As for the water-cooled furnace roller, the cooling capacity of water is relatively large, and the surface temperature of the furnace roller body is close to the water temperature. Although there is a fiber sleeve for heat insulation, the temperature field in the furnace will be affected because the surface temperature of the furnace roller body is too different from the furnace temperature.

[0035] The furnace roller body 100 is provided with a cooling hole 130 extending along its axial direction for cooling gas to pass through for heat exchange and cooling. The cooling gas is passed from the cooling gas inlet 150 connected to one end of the furnace roller body 100 through the corresponding rotary joint 140 into the cooling hole 130 inside the furnace roller body 100, and after heat exchange with the furnace roller body 100, it flows out from the rotary joint 140 and the cooling gas outlet 160 at the other end. The heat is brought out through continuous heat exchange so that the temperature of the furnace roller body 100 can be maintained within the temperature range. The top and bottom of the cooling hole 130 are provided with semicircular air cooling upper holes alternately arranged along the length direction thereof. The guide plate 170 and the semicircular air-cooled lower guide plate 180 are used to increase the heat exchange efficiency of the cooling gas. The air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 are installed from the end after the furnace roller body 100 is centrifugally cast. By arranging the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180, the cooling gas flowing through the cooling hole 130 can be blocked and guided to flow alternately up and down, thereby improving the heat exchange efficiency of the cooling gas. At the same time, the convection holes 190 opened on the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 can also play a convection effect to increase the flow rate of the cooling gas, improve the convection speed and heat exchange efficiency.

[0036] Example 2

[0037] like Figure 4 As shown, the embodiment of the present application also provides an air-cooled furnace roller for use under high temperature conditions, which has substantially the same structure as the air-cooled furnace roller for use under high temperature conditions provided in Example 1, with the difference that, in the present embodiment, a fixing rod 200 coaxially arranged therewith is fixedly disposed in the cooling hole 130, the fixing rod 200 respectively passes through the grooves 250 at the center of each air-cooled upper guide plate 170 and each air-cooled lower guide plate 180 and connects each air-cooled upper guide plate 170 and each air-cooled lower guide plate 180, nine truncated cone-shaped drainage seats 210 are sleeved on the fixing rod 200, the outer diameter of each drainage seat 210 gradually increases as it moves away from the cooling gas inlet 150, and a drainage seat 210 is respectively provided between each air-cooled upper guide plate 170 and the adjacent air-cooled lower guide plate 180.

[0038] The air-cooled furnace roller used under high temperature conditions provided in the embodiment of the present application is provided with a fixed rod 200 connected to each air-cooled upper guide plate 170 and each air-cooled lower guide plate 180 in the cooling hole 130, and a truncated cone-shaped drainage seat 210 located between the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 is fixedly mounted on the fixed rod 200, the outer diameter of each drainage seat 210 gradually increases as it moves away from the cooling gas inlet 150, and the gap between the outer wall of the drainage seat 210 and the inner wall of the furnace roller body 100 gradually decreases as it moves away from the cooling gas inlet 150, so that the cooling gas entering the cooling hole 130 from the cooling gas inlet 150 is guided by the drainage seat 210 with a gradually increasing diameter to increase the flow rate when flowing through the gap between the outer wall of the drainage seat 210 and the inner wall of the furnace roller body 100, thereby improving the heat exchange efficiency of the cooling gas to the inner wall of the furnace roller body 100, increasing the heat exchange effect, and avoiding the furnace roller body 100 from being affected by the service life and deformation due to excessive temperature.

[0039] Example 3

[0040] like Figure 5 As shown, the embodiment of the present application also provides an air-cooled furnace roller for use under high temperature conditions, which has substantially the same structure as the air-cooled furnace roller for use under high temperature conditions provided in Example 2, with the difference that, in the present embodiment, the end of the guide seat 210 away from the cooling gas inlet 150 is connected to a truncated cone-shaped guide portion 220, and the outer diameter of the guide portion 220 gradually decreases as it moves away from the cooling gas inlet 150.

[0041] The air-cooled furnace roller used under high temperature conditions provided in the embodiment of the present application is connected to a truncated cone-shaped guide portion 220 at one end of the guide seat 210 away from the cooling gas inlet 150, and the outer diameter of the guide portion 220 gradually decreases as it moves away from the cooling gas inlet 150, so that the gap between the outer wall of the guide seat 210 and the inner wall of the furnace roller body 100 gradually decreases as it moves away from the cooling gas inlet 150, and the gap between the outer wall of the guide portion 220 and the inner wall of the furnace roller body 100 gradually increases as it moves away from the cooling gas inlet 150, so that the cooling gas entering the cooling hole 130 from the cooling gas inlet 150 flows through the gap between the outer wall of the guide seat 210 and the inner wall of the furnace roller body 100 and the gap between the outer wall of the guide portion 220 and the inner wall of the furnace roller body 100, and is guided by the guide seat 210 with a gradually increasing diameter and the guide portion 220 with a gradually decreasing diameter in turn, increasing the cooling gas flow rate, thereby producing an effect similar to that of a Laval tube, thereby improving the heat exchange efficiency of the cooling gas to the inner wall of the furnace roller body 100.

[0042] Example 4

[0043] like Figure 6As shown, the embodiment of the present application also provides an air-cooled furnace roller for use under high temperature conditions, which has roughly the same structure as the air-cooled furnace roller for use under high temperature conditions provided in Example 2, with the difference that an air-cooled upper guide plate 170 and an air-cooled lower guide plate 180 are respectively connected to the furnace roller body 100 with a reinforcing rib 230, each reinforcing rib 230 is connected to a fixing rod 200, and both ends of the fixing rod 200 are connected to the top and bottom of the inner wall of the furnace roller body 100 through two reinforcing rods 240.

[0044] The air-cooled furnace roller used under high temperature conditions provided in the embodiment of the present application can effectively improve the structural stability of the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 by connecting a reinforcing rib 230 between the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 respectively, and at the same time, the reinforcing rib 230 is connected to the fixing rod 200, which can further connect the fixing rod 200, the air-cooled upper guide plate 170 and the air-cooled lower guide plate 180 into a whole to improve the structural strength and stability of the fixing rod 200. The two ends of the fixing rod 200 are connected to the furnace roller body 100 by two reinforcing rods 240 respectively, which can improve the connection stability between the fixing rod 200 and the furnace roller body 100.

[0045] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. An air-cooled furnace roller used under high temperature conditions, characterized in that: It includes a furnace roller body, a fiber expansion layer wrapped around the outer wall of the furnace roller body, and a furnace roller outer casting material layer wrapped around the outer wall of the fiber expansion layer. A cooling hole is arranged in the furnace roller body. Both ends of the furnace roller body are respectively connected with rotating joints that can rotate relative to the furnace roller body. The two rotating joints are respectively connected with a cooling gas inlet and a cooling gas outlet connected to the cooling hole. A plurality of air-cooled upper guide plates arranged at intervals along the length direction of the cooling hole are arranged at the top of the cooling hole. A plurality of air-cooled lower guide plates arranged at intervals along the length direction of the cooling hole are arranged at the bottom of the cooling hole. The air-cooled upper guide plates and the air-cooled lower guide plates are alternately arranged along the length direction of the cooling hole.

2. The air-cooled furnace roller used under high temperature conditions according to claim 1, characterized in that: The air-cooled upper guide plate and the air-cooled lower guide plate are respectively provided with at least one convection hole.

3. The air-cooled furnace roller used under high temperature conditions according to claim 1, characterized in that: A fixing rod coaxially arranged therewith is fixed in the cooling hole, and a plurality of truncated cone-shaped drainage seats are sleeved on the fixing rod. The outer diameter of the drainage seat gradually increases as it moves away from the cooling gas inlet.

4. The air-cooled furnace roller used under high temperature conditions according to claim 3, characterized in that: At least one guide seat is respectively provided between each of the air-cooled upper guide plates and the adjacent air-cooled lower guide plates.

5. The air-cooled furnace roller used in a high temperature state according to claim 3, characterized in that: The air-cooled upper guide plate and the air-cooled lower guide plate are both semicircular plates, and the fixing rods are respectively connected to each of the air-cooled upper guide plates and each of the air-cooled lower guide plates.

6. The air-cooled furnace roller used in a high temperature state according to claim 3, characterized in that: One end of the guide seat away from the cooling gas inlet is connected to a truncated cone-shaped guide portion, and the outer diameter of the guide portion gradually decreases as it moves away from the cooling gas inlet.

7. The air-cooled furnace roller used in a high temperature state according to claim 3, characterized in that: At least one reinforcing rib is connected between the air-cooled upper guide plate and the air-cooled lower guide plate and the furnace roller body respectively.

8. The air-cooled furnace roller used in a high temperature state according to claim 7, characterized in that: The reinforcing rib is connected to the fixing rod.

9. The air-cooled furnace roller used in a high temperature state according to claim 3, characterized in that: Both ends of the fixing rod are connected to the furnace roller body through a plurality of reinforcing rods.

Images