Air knife purging device of temper mill
By using high-intensity compressed air and a V-shaped air knife device in the production of cold-rolled steel coils, the problem of leveling liquid residue that is difficult to avoid in air knife purging devices has been solved, and rapid drying of the strip surface and quality improvement have been achieved.
Patent Information
- Application Number
- CN202423075020.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing air knife purging devices are difficult to effectively avoid leveling fluid residue in cold-rolled steel coil production, leading to quality problems.
Using high-intensity compressed air and a V-shaped air knife device, the leveling liquid is driven to the end face of the strip by blowing the nozzle at an angle of 10~30° with the strip surface. Combined with optimized air knife position and nozzle angle, rapid drying is achieved.
This effectively avoids the residue of leveling liquid, enables rapid drying of the strip surface, and improves the production quality of cold-rolled steel coils.
Smart Images
Figure CN223505918U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pneumatic knife blowing device for a leveling machine, belonging to the field of cold-rolled steel coil production. Background Technology
[0002] In the mass production of cold-rolled steel coils, air knife purging is a very important operation. Currently, air knife purging devices are mainly used to purge the leveling fluid from the surface of the strip at the stand exit to prevent leveling fluid residue from causing quality problems such as leveling fluid spots. Utility Model Content
[0003] To overcome the above shortcomings, this utility model provides a leveling machine air knife blowing device. This device uses high-intensity compressed air to blow away the leveling liquid on the board surface, driving the residual leveling liquid in the middle of the board surface to the end face, thereby achieving rapid drying of the board surface and more effectively avoiding leveling liquid residue.
[0004] This utility model is achieved using the following technical solution:
[0005] A leveling machine air knife purging device includes an air knife, nozzles, an air supply pipe, pipe clamps, and hoses. Two air knives are positioned above the strip steel, with the air knives placed at an angle, forming a V-shape. A row of nozzles is evenly arranged at the bottom of the air knife, with the nozzles forming an angle of 10-30° with the strip steel surface to facilitate blowing the leveling liquid from the strip steel surface outwards to both sides of the strip steel. Air inlets are located at both ends of the air knife, connected to hoses. The other end of the hoses is connected to the air supply pipe, which is connected to a compressed air tank to provide air to the air knife. The air knife is fixed to the machine frame by pipe clamps.
[0006] Furthermore, the nozzles are at a 15° angle to the surface of the strip. Each air knife has 7 nozzles at its bottom, which blow air from top to bottom at an angle of 0.4 MPa.
[0007] Furthermore, the air supply pipeline is a 5-inch diameter compressed air pipeline with a working pressure of 0.6 MPa.
[0008] Furthermore, the air knife is fixed by a pipe clamp, which includes an upper fixing ring, a lower fixing ring, and a bolt. The upper and lower fixing rings form a circular through hole through which the air knife passes, and then the two fixing rings are fastened together with the bolt. Even further, the pipe clamp is fixed to the leveling machine frame and can be directly welded to the frame's mounting plate.
[0009] Furthermore, the hose is a metal hose that connects the compressed air pipe to the air knife inlet.
[0010] The air knife purging device provided by this utility model is installed between the anti-breakage roller and the tension measuring roller at the exit of the leveling machine, approximately 100mm above the untensioned strip surface. The device operates as follows: compressed air enters the air knife through a metal hose and is evenly distributed to each nozzle by the air knife beam. The angle between the nozzle and the steel plate surface is 10-30°, purging the strip surface in a fan shape. This blows the leveling fluid onto the strip end face, causing the strip surface to dry quickly and reducing leveling fluid residue.
[0011] The air knife purging device for the leveling machine provided by this utility model has the following beneficial effects:
[0012] The device uses high-intensity compressed air to blow away the leveling fluid on the strip surface, driving the residual leveling fluid in the middle to the end face of the strip, thus achieving rapid drying of the strip surface and effectively avoiding leveling fluid residue. Attached Figure Description
[0013] Figure 1 This is a top-view structural diagram of the air knife blowing device for the leveling machine of this utility model.
[0014] Figure 2 This is a side view of the structure of the air knife blowing device for the leveling machine of this utility model.
[0015] In the diagram: 1 is the air knife, 2 is the nozzle, 3 is the air supply pipe, 4 is the pipe clamp, 5 is the frame, 6 is the strip steel, and A is the direction of steel passage. Detailed Implementation Example
[0016] like Figure 1 As shown, this embodiment provides a leveling machine air knife purging device, including an air knife 1, a nozzle 2, an air supply pipe 3, a pipe clamp 4, and a flexible hose; the air knife 1 includes two air knives, located above the strip 6, the air knives are placed at an angle, and the two air knives are combined to form a V-shaped structure; a row of nozzles 2 are evenly arranged at the bottom of the air knife 1, the nozzles 2 are at a 15° angle to the surface of the strip 6, which facilitates blowing the leveling liquid on the surface of the strip 6 outward to both sides of the strip; air inlets are provided at both ends of the air knife 1, the air inlets are connected to the flexible hose, the other end of the flexible hose 5 is connected to the air supply pipe 3, the air supply pipe 3 is connected to a compressed air tank to provide an air source for the air knife 1; the air knife 1 is fixed to the frame 5 by the pipe clamp 4.
[0017] Furthermore, each air knife has 7 nozzles at the bottom, which blow air from top to bottom at an angle, with a working pressure of 0.4 MPa.
[0018] Furthermore, the air supply pipe 3 is a compressed air pipe with a diameter of 5 inches and a working pressure of 0.6 MPa.
[0019] Furthermore, the air knife 1 is fixed by a pipe clamp 4, which includes an upper fixing ring, a lower fixing ring, and a bolt. The air knife passes through a circular through hole formed by the upper and lower fixing rings, and then the two fixing rings are fastened together with the bolt. Even further, the pipe clamp is fixed to the leveling machine frame 5 and can be directly welded to the fixing plate of the frame 5.
[0020] Furthermore, the hose is a metal hose that connects the compressed air pipe to the air knife inlet.
[0021] The specific settings for each component are as follows:
[0022] Air knife: By pulling the original air knife supply pipeline, a new type of air knife purging device is added; the two air knives are combined to form a V-shaped air knife structure;
[0023] Nozzle: Connection size: G1 / 4; Length: 88mm; Maximum width: 47mm; Number of holes: 16; Hole diameter: 1mm; Material: 0Cr18Ni9. The purging device uses a total of 14 nozzles, which are at a 15-degree angle to the plate surface and blow air from top to bottom. The working pressure of the nozzle is 0.4MPa.
[0024] Air supply pipeline: A 5-inch diameter compressed air pipeline is used, with a working pressure of 0.6 MPa;
[0025] Pipe clamps: Double-nut heavy-duty pipe clamps are used to fix the horizontal position of the air knife beam without affecting the adjustment of the air knife beam's angle (standard part 1.5 inch, adjustable air knife blowing angle).
[0026] Hose: A 2.5-inch diameter metal hose is used to connect the compressed air pipeline to the air knife purging device.
[0027] The original air knife was located 50mm behind the work roller on the leveling machine. During production, the steel coil head was prone to warping and collisions, and the blowing effect was poor, resulting in serious residue of leveling fluid. Based on this phenomenon, the air knife blowing device was optimized, and the structure of this utility model was proposed. The specific implementation method is described as follows:
[0028] (1) The position of the air knife beam is optimized and moved from behind the working roll to between the exit anti-breakage roll and the exit tension roll, which effectively prevents collisions during the threading process;
[0029] (2) The shape of the air knife beam is optimized from a straight pipe to a V-shaped pipe (the straight pipe is cut and the pipe is reconnected by welding technology to modify the angle), which improves the blowing direction of the nozzle and blows in a fan shape. This can blow the plate leveling liquid to the end face and reduce residue.
[0030] (3) The nozzle angle was optimized from 90 degrees to 15 degrees to blow the board surface, which expanded the blowing range and improved the effect.
Claims
1. A leveling machine air knife blowing device, characterized in that: The system includes an air knife, nozzles, an air supply pipe, pipe clamps, and hoses. Two air knives are positioned above the strip and are tilted, forming a V-shape. A row of nozzles is evenly distributed at the bottom of the air knife, forming a 10-30° angle with the strip surface to facilitate blowing the leveling liquid outwards to both sides of the strip. Air inlets are located at both ends of the air knife, connected to hoses. The other end of the hoses is connected to an air supply pipe, which is connected to a compressed air tank to provide air to the air knife. The air knife is fixed to the frame using pipe clamps.
2. The air knife purging device for a leveling machine according to claim 1, characterized in that: The nozzle forms a 15° angle with the surface of the strip steel.
3. The air knife purging device for a leveling machine according to claim 2, characterized in that: Each air knife has 7 nozzles at the bottom, which blow air from top to bottom at an angle. The working pressure of the nozzles is 0.4 MPa.
4. The air knife purging device for a leveling machine according to claim 1, characterized in that: The air supply pipeline is a 5-inch diameter compressed air pipeline with a working pressure of 0.6 MPa.
5. The air knife purging device for a leveling machine according to claim 1, characterized in that: The air knife is fixed by a pipe clamp, which includes an upper fixing ring, a lower fixing ring, and a bolt. The air knife passes through a circular through hole formed by the upper and lower fixing rings, and then the two fixing rings are fastened together with the bolt.
6. The air knife purging device for a leveling machine according to claim 5, characterized in that: The pipe clamps are welded to the fixing plate of the leveling machine frame.
7. The air knife purging device for a leveling machine according to claim 1, characterized in that: The hose is a metal hose that connects the compressed air pipe to the air knife inlet.