Flow guide structure for double reverse blowing nozzles of water tank after finish rolling

Abstract

The utility model discloses a flow guide structure for double reverse blowing nozzles of a water tank after finish rolling, which belongs to the technical field of steel rolling and comprises a nozzle body, a front reverse blowing head is arranged at the feed end of the nozzle body, a rear reverse blowing head is arranged at the discharge end of the nozzle body, and through channels are axially arranged in the front reverse blowing head, the nozzle body and the rear reverse blowing head in a penetrating manner; a mounting cavity is formed in the discharging end of the nozzle body, and a communicating hole for communicating the mounting cavity with the outside is formed in the discharging end of the nozzle body; the mounting cavity close to the side of the through channel in the nozzle body is a conical cavity, and the small-diameter end of the conical cavity is communicated with the through channel in the nozzle body; the rear blowback head comprises an installation part matched with the installation cavity, an annular gap is formed between the installation part and the installation cavity, the end face, facing the side of the through channel in the nozzle body, of the installation part is a conical end face, and a spraying channel is formed between the conical end face and the conical cavity. The reverse blowing effect is improved through two times of reverse blowing of the reverse double-blowing nozzle, and the problem that a rolled piece with water flows out of the water tank is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel rolling, and particularly relates to a double reverse sweeping nozzle guide structure for a water tank after fine rolling. Background Art

[0002] After rolling out of the finishing mill, the steel rolled pieces need to be cooled through a water cooling device. Currently, hot-rolled bars and wire rods are all cooled through water. The outermost layer of the water cooling device is a water tank welded with steel plates, and the forward blowing nozzle, cooling nozzle and reverse blowing nozzle are arranged in sequence in the water tank. The forward blowing nozzle blocks the cooling water at the inlet end of the water tank, and the reverse blowing nozzle blocks the cooling water at the outlet end of the water tank. There are three reverse blowing nozzles, and the first two along the rolling direction are blocked by high-pressure water, and the last one is blocked by compressed air.

[0003] Patent No. CN202223608351X discloses a reverse purge nozzle for a water tank after pre-finishing rolling. This application is a reverse purge nozzle designed by the applicant. Now, through experimental improvement and optimized design, it is found that when the process requires the cooling water flow rate to exceed a certain value, the amount of cooling water on the surface of the red steel increases, and the cooling water on the surface of the red steel blown away by the rear back-blowing head cannot be discharged from the inlet of the back-blowing nozzle in time, affecting the blocking effect. Therefore, it is imperative to quickly discharge the cooling water on the surface of the red steel blown away by the rear back-blowing head. The back-blowing nozzle cannot block the cooling water, and the red steel has water, which not only affects the appearance of the site, but also affects the performance of the product. Summary of the invention

[0004] In view of the problems existing in the prior art, the utility model provides a double reverse purge nozzle guide structure for the water tank after finishing rolling. Without increasing the number of backblowing nozzles, the reverse double purge nozzles are used for two backblowings, thereby improving the backblowing effect, solving the problem of water coming out of the water tank with the rolled piece, and ensuring product performance.

[0005] The utility model is implemented as follows: a double reverse blowing nozzle guide structure of a water tank after finishing rolling comprises a nozzle body, a front reverse blowing head is arranged at the feeding end of the nozzle body, the front reverse blowing head is used to reversely spray high-pressure water and compressed air on the surface of the rolled piece, a rear reverse blowing head is arranged at the discharge end of the nozzle body, and a through channel for the rolled piece to penetrate is arranged axially through the front reverse blowing head, the nozzle body and the rear reverse blowing head;

[0006] The discharge end of the nozzle body is provided with a mounting cavity for placing the rear back-blowing head, the mounting cavity is arranged concentrically with the through-channel, the discharge end of the nozzle body is provided with a connecting hole connecting the mounting cavity with the outside, the mounting cavity close to the through-channel side in the nozzle body is a conical cavity, and the small-diameter end of the conical cavity is connected to the through-channel in the nozzle body;

[0007] The rear back-blowing head comprises a mounting portion matching the mounting cavity, an annular gap is formed between the mounting portion and the mounting cavity, the end face of the mounting portion facing the through-channel side in the nozzle body is a conical end face, and a jet channel is formed between the conical end face and the conical cavity.

[0008] Furthermore, the nozzle body is formed by relatively splicing two nozzle components with the same structure, and a guide hole for connecting the through channel with the outside is arranged in the nozzle component.

[0009] Furthermore, the center line of the guide hole forms an angle of 45° with the advancing direction of the rolled piece.

[0010] Furthermore, grooves are provided on the engaging end surfaces of the nozzle components on both sides of the through channel, and the grooves on both sides form guide grooves after the two nozzle components are relatively spliced ​​and engaged.

[0011] Furthermore, the center line of the guide groove and the center line of the through channel are on the same horizontal plane.

[0012] Furthermore, the gap of the injection channel is 0.6-0.8 mm.

[0013] The utility model has the following advantages and technical effects: due to the adoption of the above technical scheme, double backblowing of the reverse double purge nozzle is utilized without increasing the number of backblowing nozzles, thereby improving the backblowing effect, solving the problem of water coming out of the water tank with the rolled piece, and ensuring product performance.

[0014] The cooling water on the red steel surface swept away by the rear back-blowing head is diverted through the guide holes and guide grooves, which reduces the pressure previously discharged from the back-blowing nozzle inlet, improves the back-blowing effect, and avoids the phenomenon that the purged cooling water is retained in the nozzle channel and causes the red steel surface to be watered again. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of the overall structure provided by an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the connection of the rear back-blowing head provided in an embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of the overall structure provided by an embodiment of the utility model.

[0018] In the figure: 1. nozzle body; 1-1. nozzle component; 2. front back-blow head; 3. rear back-blow head; 3-1. mounting portion; 3-2. tapered end face; 4. through channel; 5. mounting cavity; 6. connecting hole; 7. tapered cavity; 8. annular gap; 9. injection channel; 10. guide hole; 11. groove; 12. guide groove. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0020] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] like Figures 1 to 3 As shown, the present application provides a double reverse blowing nozzle guide structure for a water tank after finishing rolling, comprising a nozzle body 1, a front reverse blowing head 2 is provided at the feeding end of the nozzle body 1, and the front reverse blowing head 2 is used to reversely spray high-pressure water and compressed air on the surface of the rolled piece, and a rear reverse blowing head 3 is provided at the discharge end of the nozzle body 1, and a through channel 4 for the rolled piece to penetrate is axially provided inside the front reverse blowing head 2, the nozzle body 1 and the rear reverse blowing head;

[0022] The discharge end of the nozzle body 1 is provided with a mounting cavity 5 for placing the rear back-blowing head 3, the mounting cavity 5 is arranged concentrically with the through-channel 4, the discharge end of the nozzle body 1 is provided with a connecting hole 6 for connecting the mounting cavity 5 with the outside, the mounting cavity 5 close to the through-channel 4 in the nozzle body 1 is a tapered cavity 7, and the small-diameter end of the tapered cavity 7 is connected to the through-channel 4 in the nozzle body 1;

[0023] The rear back-blowing head 3 includes a mounting portion 3-1 that matches the mounting cavity 5. The mounting portion 3-1 is provided with a mounting platform. Bolts lock the mounting platform of the rear back-blowing head 3 with the nozzle body 1. An annular gap 8 is formed between the mounting portion 3-1 and the mounting cavity 5. The end face of the mounting portion 3-1 facing the through-channel 4 in the nozzle body 1 is a conical end face 3-2. A jet channel 9 is formed between the conical end face 3-2 and the conical cavity 7. Specifically, the gap of the jet channel 9 is 0.6 to 0.8 mm. When rolling Q235 steel, the gap is 0.6 mm, and when rolling 82B steel, the gap is 0.8 mm. The setting of the gap of the jet channel 9 can prevent the rolled piece from carrying water and ensure the minimum use of compressed air.

[0024] Furthermore, the nozzle body 1 is composed of two nozzle components 1-1 of the same structure, and the nozzle component 1-1 is provided with a guide hole 10 for connecting the through channel 4 with the outside. Preferably, the center line of the guide hole 10 forms an angle of 45° with the advancing direction of the rolled piece.

[0025] Furthermore, grooves 11 are provided on the engaging end faces of the nozzle components 1-1 on both sides of the through channel 4, and the grooves 11 on both sides form guide grooves 12 after the two nozzle components 1-1 are relatively spliced ​​and engaged. Preferably, the center line of the guide groove 12 is on the same horizontal plane as the center line of the through channel.

[0026] During operation, the workpiece passes through the through channel 4; high-pressure water and compressed air are reversely sprayed onto the surface of the workpiece through the front back-blowing head 2; high-pressure water and compressed air enter the annular gap 8 through the connecting hole 6, and are reversely sprayed onto the surface of the workpiece through the injection channel 9; a small part of the cooling water carried on the surface of the workpiece by reverse blowing through the injection channel 9 is discharged from the nozzle inlet, and most of it is discharged from the guide hole 10 and the guide groove 12.

[0027] By adopting the above technical scheme, the double back-blowing of the reverse double-purge nozzle is utilized without increasing the number of back-blowing nozzles, thereby improving the back-blowing effect, solving the problem of water in the water tank of the rolled piece, and ensuring product performance.

[0028] The cooling water on the red steel surface swept away by the rear back-blowing head 3 is diverted through the guide holes 10 and the guide grooves 12, which reduces the pressure previously discharged from the back-blowing nozzle inlet, improves the back-blowing effect, and avoids the phenomenon that the purged cooling water is retained in the nozzle channel and causes the red steel surface to be hydrated again.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double reverse blowing nozzle guide structure for a water tank after finishing rolling, comprising a nozzle body, a front reverse blowing head is arranged at the feed end of the nozzle body, and the front reverse blowing head is used to reversely spray high-pressure water and compressed air onto the surface of the rolled piece. It is characterized in that The discharge end of the nozzle body is provided with a rear back-blowing head, and a through passage for the rolled piece to pass through is axially provided in the front back-blowing head, the nozzle body and the rear back-blowing head; The discharge end of the nozzle body is provided with a mounting cavity for placing the rear back-blowing head, the mounting cavity is arranged concentrically with the through-channel, the discharge end of the nozzle body is provided with a connecting hole connecting the mounting cavity with the outside, the mounting cavity close to the through-channel side in the nozzle body is a conical cavity, and the small-diameter end of the conical cavity is connected to the through-channel in the nozzle body; The rear back-blowing head comprises a mounting portion matching the mounting cavity, an annular gap is formed between the mounting portion and the mounting cavity, the end face of the mounting portion facing the through-channel side in the nozzle body is a conical end face, and a jet channel is formed between the conical end face and the conical cavity.

2. The double reverse purge nozzle guide structure of the water tank after finishing rolling according to claim 1, It is characterized in that The nozzle body is formed by relatively splicing two nozzle components with the same structure, and a guide hole for connecting the through channel with the outside is arranged in the nozzle component.

3. The double reverse purge nozzle guide structure of the water tank after finishing rolling according to claim 2, It is characterized in that The center line of the guide hole forms an angle of 45° with the advancing direction of the rolled piece.

4. The double reverse purge nozzle guide structure of the water tank after finishing rolling according to claim 2, It is characterized in that Grooves are arranged on the buckling end faces of the nozzle components on both sides of the through channel, and the grooves on both sides form guide grooves after the two nozzle components are relatively spliced ​​and buckled.

5. The double reverse purge nozzle guide structure of the water tank after finishing rolling according to claim 4, It is characterized in that The center line of the guide groove and the center line of the through passage are on the same horizontal plane.

6. The double reverse purge nozzle guide structure for the water tank after finishing rolling according to claim 1, It is characterized in that The gap of the injection channel is 0.6-0.8 mm.

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