Jet-propelled high-temperature furnace roller

Abstract

The utility model relates to a jet-propelled high-temperature furnace roller which comprises a furnace roller main body and a ventilation pipeline, wherein a cavity is formed in the middle of the furnace roller main body; the ventilation pipeline is arranged in the middle of the furnace roller main body and is provided with a plurality of overflow pipes communicated to the cavity; one end, connected with the rotary joint, of the ventilation pipeline is a nitrogen inlet end, and the other end is a closed end; and a plurality of air outlet holes are formed in the roller surface wrapping the cavity. According to the utility model, nitrogen is used as a cooling medium instead of cooling water, so that poor atmosphere in the furnace caused by leakage of the cooling water is avoided; nitrogen is injected into the furnace roller through the rotary joint, the ventilation pipeline and the overflow pipe, certain pressure is formed, and the nitrogen is sprayed into the furnace body through the air outlet holes, so that the furnace roller is cooled through the nitrogen; meanwhile, due to the fluidity of the atmosphere, a good cooling effect can be kept; the cooling rate can be effectively adjusted by adjusting injection of nitrogen subsequently, and a good control effect can be provided for strip steel plate shape control.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal heat treatment equipment, is located in a galvanizing annealing furnace and is used to support strip steel, in particular to a jet-type high-temperature furnace roller. Background Art

[0002] In the production process of the galvanizing annealing furnace, the strip steel completes the annealing process in the furnace. Since the strip steel needs to travel a long distance in the furnace, it is necessary to use furnace rollers to support the strip steel to ensure the operation of the strip steel in the furnace. Since the strip steel needs to be heated in the furnace, the temperature inside the entire furnace is relatively high. The furnace rollers are used in the furnace for a long time, so they need to be cooled to ensure the service life of the furnace rollers.

[0003] The original annealing furnace rollers are generally cooled by water. Although water cooling can greatly reduce the temperature of the rollers and reduce the efficiency of their heat radiation, the following problems are inevitable during the use of the rollers:

[0004] 1. The specific heat capacity of water cooling in the water-cooled furnace roller is too high, which cools the roller body too quickly, causing uneven heating of the strip on the furnace roller, resulting in poor product shape;

[0005] 2. The manufacturing requirements of water-cooled furnace rollers are relatively high. The sealing effect of the water-passing part must be guaranteed and no leakage should occur. Once the cooling water flows into the furnace, it will have a great impact on the furnace atmosphere.

[0006] 3. During the water cooling and furnace heating process, it is very easy for different areas of the roller body to be heated unevenly, causing fatigue cracks in the roller and thus shortening the roller life. Summary of the invention

[0007] The utility model provides a jet-type high-temperature furnace roller to solve the technical problems existing in the known technology, thereby solving the problems of bad atmosphere in the furnace caused by too fast cooling of water cooling and leakage of cooling water, and making the cooling of the furnace roller more uniform.

[0008] The utility model includes the following technical solutions: a jet-type high-temperature furnace roller, comprising a furnace roller body with a cavity in the middle and a ventilation pipeline; the ventilation pipeline is arranged in the middle of the furnace roller body, and a plurality of overflow pipes connected to the cavity are arranged on the ventilation pipeline; one end of the ventilation pipeline connected to the rotary joint is the nitrogen inlet end, and the other end is a closed end; a plurality of air outlet holes are arranged on the roller surface surrounding the cavity.

[0009] Furthermore, the opening shape of the air outlet is truncated cone-shaped, so as to achieve the effect of increasing the surface nitrogen flow rate of the furnace roller; the outer surface diameter length of the air outlet is smaller than the inner surface diameter length of the air outlet, the outer surface diameter of the air outlet is 1mm, and the inner surface diameter is 3mm.

[0010] Furthermore, the lateral spacing between the air outlet holes is 10 mm, and the angle between a row of inclined air outlet holes and the vertical direction is 18°.

[0011] Furthermore, 20 air outlet holes are arranged around the roller surface of the furnace roller.

[0012] Furthermore, the overflow pipe has a diameter of 5 mm, and the overflow pipe is set from the center line of the furnace roller, and is set every 100 mm, so that the nitrogen introduced can be evenly diffused into the cavity of the furnace roller and form a pressure of 500-1000 Pa.

[0013] Furthermore, the ventilation pipeline is fixed in the cavity through a support frame.

[0014] Furthermore, the ventilation pipeline is made of 304 stainless steel pipe.

[0015] Furthermore, the roller surface coating of the furnace roller adopts a coating product of LCO-17 or above.

[0016] Furthermore, the furnace roller body is made of ZG35Cr26Ni12 material by centrifugal casting.

[0017] The utility model has the following advantages and positive effects:

[0018] 1. The utility model adopts nitrogen instead of cooling water as the cooling medium, thus avoiding the bad atmosphere in the furnace caused by the leakage of cooling water on the furnace roller.

[0019] 2. The utility model injects nitrogen into the furnace rollers to form a certain pressure by setting a rotary joint, a ventilation pipeline and an overflow pipe, and sprays it into the furnace body through the air outlet, so that the furnace rollers are cooled by nitrogen; at the same time, due to the fluidity of the atmosphere, it can maintain a good cooling effect; subsequently, by adjusting the injection of nitrogen, the cooling rate can be effectively adjusted, and a good control effect can also be provided for the strip shape control.

[0020] 3. The utility model can effectively extend the overall service life of the furnace roller. It is expected that the roller body life will reach more than 10 years, and the roller surface coating life will not be less than 5 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall cross-sectional schematic diagram of the utility model;

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of the local A in the middle;

[0023] Figure 3 It is a schematic diagram of the distribution of vent holes on the surface of the furnace roller;

[0024] In the figure, 1-furnace roller body; 2-ventilation pipeline; 3-cavity; 4-overflow pipe; 5-rotating joint; 6-air outlet; 7-support frame. DETAILED DESCRIPTION

[0025] In order to further disclose the content, features and effects of the invention of the utility model, the following examples are specifically cited and described in detail in conjunction with the accompanying drawings. In the description of the following embodiments, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply 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 a limitation on this patent.

[0026] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0027] Example: See attached Figure 1-3 A jet-type high-temperature furnace roller comprises a furnace roller body 1 with a cavity 3 in the middle and a ventilation pipe 2; the roller surface coating of the furnace roller adopts a coating product of LCO-17 or above. The furnace roller body 1 is made of ZG35Cr26Ni12 material by centrifugal casting.

[0028] The ventilation pipeline 2 is arranged in the middle of the furnace roller body 1, and a plurality of overflow pipes 4 connected to the cavity 3 are arranged on the ventilation pipeline 2; the overflow pipe 4 has a diameter of 5 mm, and the overflow pipe 4 is arranged starting from the center line of the furnace roller, and one overflow pipe 4 is arranged every 100 mm, so that the nitrogen introduced can be evenly diffused into the furnace roller cavity 3 and form a pressure of 500-1000 Pa.

[0029] The ventilation pipe 2 is made of 304 stainless steel pipe. The ventilation pipe 2 is fixed in the cavity 3 through a support frame 7. The ventilation pipe 2 is connected to the rotary joint 5 at one end as the nitrogen inlet end, and the other end is a closed end; a plurality of air outlet holes 6 are arranged on the roller surface wrapping the cavity 3. The opening shape of the air outlet hole 6 is truncated cone-shaped, so as to achieve the effect of increasing the nitrogen flow rate on the surface of the furnace roller; the outer surface diameter length of the air outlet hole 6 is smaller than the inner surface diameter length of the air outlet hole 6, the outer surface diameter of the air outlet hole 6 is 1mm, and the inner surface diameter is 3mm. The lateral spacing between the air outlet holes 6 is 10mm, and the angle between a row of inclined air outlet holes 6 and the vertical is 18°. Twenty air outlet holes 6 are opened around the roller surface of the furnace roller.

[0030] Working principle: Nitrogen is used as the cooling medium instead of cooling water to avoid the bad atmosphere in the furnace roller caused by cooling water leakage; nitrogen is injected into the furnace roller by setting the rotary joint 5, ventilation pipeline 2 and overflow pipe 4 to form a certain pressure; when in use, nitrogen is injected into the ventilation pipeline 2, and the nitrogen purity is guaranteed to be above 99.999%, and an internal pressure of 500-1000Pa is formed in the cavity 3. During the production process, the nitrogen inside the furnace roller body 1 is sprayed to the outside through the air outlet 6, thereby cooling the furnace roller; by adjusting the injection of nitrogen later, the cooling rate can be effectively adjusted, and the strip shape control can also be provided with a good control effect. The atmosphere in the furnace is monitored in real time by the atmosphere analyzer placed in the furnace, and the hydrogen injection in the furnace is adjusted according to the detection results to ensure its comprehensive atmosphere level.

[0031] Although the preferred embodiments of the utility model are described above, the utility model is not limited to the above specific embodiments, which are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can make many forms without departing from the purpose of the utility model and the scope of protection of the claims. All of these belong to the protection scope of the utility model.

Claims

1. A jet-type high-temperature furnace roller, characterized in that: It comprises a furnace roller body with a cavity in the middle and a ventilation pipeline; the ventilation pipeline is arranged in the middle of the furnace roller body, and a plurality of overflow pipes connected to the cavity are arranged on the ventilation pipeline; one end of the ventilation pipeline connected to the rotary joint is the nitrogen inlet end, and the other end is a closed end; a plurality of air outlet holes are arranged on the roller surface covering the cavity.

2. The jet-type high-temperature furnace roller according to claim 1, characterized in that: The opening shape of the air outlet hole is a truncated cone; the diameter length of the outer surface of the air outlet hole is smaller than the diameter length of the inner surface of the air outlet hole.

3. The jet-type high-temperature furnace roller according to claim 2, characterized in that: The outer surface diameter of the air outlet is 1 mm, and the inner surface diameter is 3 mm.

4. The jet-type high-temperature furnace roller according to claim 3, characterized in that: The lateral spacing between the air outlet holes is 10 mm, and the angle between a row of inclined air outlet holes and the vertical direction is 18°.

5. The jet-type high-temperature furnace roller according to claim 4, characterized in that: Twenty air outlet holes are arranged around the roller surface of the furnace roller.

6. The jet-type high-temperature furnace roller according to claim 1, characterized in that: The overflow pipe has a diameter of 5 mm and is set from the center line of the furnace roller at intervals of 100 mm.

7. The jet-type high-temperature furnace roller according to claim 1, characterized in that: The ventilation pipeline is fixed in the cavity through a support frame.

8. The jet-type high-temperature furnace roller according to claim 7, characterized in that: The ventilation pipeline is made of 304 stainless steel pipe.

9. The jet-type high-temperature furnace roller according to any one of claims 1 to 8, characterized in that: The roller surface coating of the furnace roller adopts a coating product of LCO-17 or above level.

10. The jet-type high-temperature furnace roller according to any one of claims 1 to 8, characterized in that: The furnace roller body is made of ZG35Cr26Ni12 material by centrifugal casting.

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