A device for preventing slot nozzle from being blocked

Abstract

The present invention relates to a device for preventing clogging of a slot nozzle, comprising a connecting component arranged on the left side of a rotating slot nozzle air pipeline and a rotating slot nozzle assembly at the right end of the air pipeline, wherein a group of gear rotating devices are arranged on the air pipeline, the gear rotating devices are fixedly mounted on the outside of the air pipeline, and the device is driven to rotate by the rotation of the gears; the present invention is designed to address the drawbacks of the existing devices, and can not only ensure that the slot nozzle forms a good wind knife to sweep the emulsion on the working roller, but also ensure that during the emulsion blowing work, the slot nozzle is prevented from being blocked, thereby improving the continuity of steel rolling and thus improving the economic benefits; secondly, the invention can self-clear the blockage of the clogged slot nozzle while working, thereby improving the service life of the nozzle, increasing the operating cycle of the cold-rolled steel strip, and reducing the cost of replacing the nozzle; the present invention is simple to operate, and a single person can complete the emulsion blowing work through the PLC intelligent control system, thereby reducing labor costs.

Description

Technical Field

[0001] The invention relates to a device, in particular to a device for preventing a slot-type nozzle from being blocked, and belongs to the technical field of cold-rolled steel. Background Art

[0002] Steel rolling is the process of changing the shape of steel ingots and billets between rotating rollers. The goals of steel rolling, like other press processes, are to achieve the desired shape, such as steel plates, strips, wire rods, and various steel sections, and to improve the internal quality of the steel. However, during the cold rolling process, the high heat generated by the compression between the rollers and the strip causes deformation. To dissipate this heat, emulsions are often used as lubricants and coolants in cold rolling operations. However, the surface of the rolled strip must be kept clean, so an emulsion purge device is installed at the exit of the last stand of the rolling mill. This device uses compressed air to remove the emulsion from the strip surface. Incomplete purge can leave residual emulsion on the strip, forming emulsion stains that affect surface quality and, in severe cases, can lead to rust. To address this issue, researchers have developed an emulsion purge device consisting of straight, angled, slot, and suction nozzles. However, during use, because the slot nozzle is always oriented upward, the splashing emulsion often clogs the nozzle, causing the nozzle to stop blowing, reducing the emulsion removal rate and affecting the quality of the strip. This project was proposed in this context to design a rotatable and self-cleaning slot nozzle to avoid clogging and solve this problem. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by providing a device for preventing slot nozzle clogging. This technical solution utilizes a rotating slot nozzle structure as an alternative to conventional slot nozzles for cold-rolled strip, resolving the problem of slot nozzle clogging caused by splashing when spraying emulsion. This improves the removal rate of emulsion from the strip surface, eliminating the impact of emulsion on strip surface quality. Furthermore, it extends the nozzle's service life, increases the cold-rolled strip's operating cycle, reduces nozzle replacement costs, and improves economic efficiency.

[0004] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: a device for preventing clogging of a slot nozzle, comprising a connecting component disposed on the left side of a rotating slot nozzle gas pipeline and a rotating slot nozzle assembly at the right end of the gas pipeline, wherein the connecting component and the rotating slot nozzle assembly are connected by welding or other means, a set of gear rotating devices are provided on the gas pipeline, the gear rotating devices are fixedly mounted on the outside of the gas pipeline, and the device is rotated by the gear rotation. The connecting component is provided with a set of bearings embedded in the gas pipeline, the bearings are used to connect to the air intake pipe, the rotating slot nozzle is integrated with the gas pipeline, and the gas pipeline is rotated by the gears to rotate the slot nozzle so that the slot nozzle completes a 360° rotation, hence the name rotating slot nozzle, and the nozzle tip is provided with four airflow control structures that can translate along the gas pipeline direction to control the size of the gap on the slot nozzle and thus the amount of airflow.

[0005] As an improvement of the present invention, the connecting component on the left side of the rotating slot nozzle gas pipeline includes a gas pipeline 2, a bearing and an air intake pipe. The bearing is embedded in and welded to the inner wall of the gas pipeline. The inner diameter of the bearing is larger than the inner diameter of the gas pipeline and can be set according to actual needs. The air intake pipe is inserted into the inner wall of the bearing inner ring and sealed with sealant to prevent air leakage. The inner diameter of the air intake pipe is the same as the inner diameter of the gas pipeline.

[0006] As an improvement of the present invention, the bearing uses a gas-sealed bearing to ensure that the airflow will not leak from the connecting parts during the blowing process. The bearing can perform 360° circular motion, thereby meeting the rotation requirements of the rotating slot nozzle.

[0007] As an improvement of the present invention, the gear rotation device includes a gear installed on the outer wall of the air pipe, a transmission motor for driving the gear rotation, and a PLC intelligent control system for rotating the intelligent control device. The gear can be selected from rectangular, trapezoidal and other types, and there is no requirement for gear selection. A group of motor transmission devices are arranged outside the gear, and the transmission motor is provided with a gear that matches the gear for driving the air pipe to rotate. The transmission motor is connected to an external voltage and a group of PLC intelligent control systems for intelligently controlling the transmission motor to rotate the air pipe and thereby rotate the slot nozzle. The PLC intelligent control system can control the rotating device to rotate according to a unit rotation angle. The rotation angle can be set according to the number of slot nozzles to ensure that there is always one nozzle of the rotating slot nozzle facing upwards and facing the working roller.

[0008] As an improvement of the present invention, the rotating slot nozzle assembly includes uniform slot nozzles arranged in the circumferential direction of the gas pipe, and the number of nozzles is set to more than three, so that there is always one nozzle in the working position (facing the working roller) and the previous working position rotates away from the blocked or about to be blocked nozzle to blow toward both sides of the strip, avoiding secondary contamination of the strip by emulsion blockages, and gas guide holes are set inside the multiple nozzles for gas supply.

[0009] As an improvement of the present invention, a group of blocking components are provided inside the rotating slot nozzle to prevent the lower nozzle (the nozzle facing the strip) from spraying airflow. The blocking components include a blocking ball and a track. The track is positioned in the circumferential direction of the slot nozzle air guide hole. The track diameter is larger than the diameter of the slot nozzle air guide hole. A solid steel blocking ball is installed on the track. During the rotation process, it will always roll to the bottom air guide hole under the action of gravity to block the airflow output, thereby preventing the lower nozzle from spraying emulsion to contaminate the strip.

[0010] As an improvement of the present invention, four airflow control devices that can be translated along the direction of the air pipe are set at the top of the nozzle. The control structure can perform translational movement independently to independently control the size of the gap on the slit nozzle and thus control the amount of air flow. The gap is 2mm to 10mm. This range can form a good wind knife to blow the emulsion on the surface of the working roller or the emulsion dripping due to condensation away from the roller.

[0011] A method for preventing slit nozzles from being clogged, the method being specifically as follows: when the nozzle at a working position is clogged or is about to be clogged, the air supply pipe is controlled by a PLC intelligent control system to drive the motor to rotate, thereby driving the rotating slit nozzle to rotate, so that clean nozzles in multiple groups of slit nozzles in the circumferential direction of the air supply pipe replace the original clogged or clogged nozzles, and are continuously rotated and used, so that the clogged nozzles or the nozzles that are about to be clogged are turned away from the working position toward both sides for self-cleaning. At the same time, there are still slit nozzles in working state at the working position, and the air flow pressure of a single nozzle is adjusted to below 0.6MPa as required, the air guide hole of the lower nozzle is always blocked by a ball seal and is in an airflow-blocked state, the air flow pressure is set to the sum of the air flow nozzle pressures according to the actual number of nozzles and the pressure of a single nozzle, and the air flow control device is adjusted as required to meet the wind knife state of different requirements.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This technical solution is designed to address the shortcomings of existing slit nozzles. It can not only ensure that the slit nozzles form a good wind knife to sweep the emulsion on the working roller, but also ensure that during the emulsion blowing operation, the slit nozzles are prevented from being blocked, so that the steel rolling emulsion sweeping task continues, thereby improving economic benefits; 2. This invention can self-clear the clogged slit nozzles while the clean nozzles are working, without the need to stop the machine for repair, thereby increasing the operating cycle of the cold-rolled steel strip and improving economic benefits; 3. Multiple groups of nozzles are used alternately to extend the service life of the nozzles and reduce the cost of replacing nozzles; 4. The entire device is simple to operate, and a single person can complete the emulsion blowing work through the PLC intelligent control system, reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1This is a schematic diagram of the structure of the rotating slot nozzle of the present invention.

[0014] Figure 2 It is a structural schematic diagram of the connecting component and the gear rotating device of the present invention.

[0015] Figure 3 Schematic diagram of the structure of the airflow control device in the present invention.

[0016] Among them: 1. Gas transmission pipeline 1, 2. Track, 3. Gas transmission guide hole, 4. Air flow control device, 5. Slit nozzle, 6. Blocking ball, 7. Gas transmission pipeline 2, 8. Gear, 9. Bearing, 10. Inlet pipe, 11. Transmission motor, 12. PLC intelligent control system, 13. Air flow control device, 14. Track, 15. Blocking ball. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, this embodiment is described in detail below with reference to the accompanying drawings.

[0018] Example 1: See Figure 1-Figure 3A device for preventing clogging of a slot nozzle comprises a connecting component provided on the left side of a rotating slot nozzle gas pipeline and a rotating slot nozzle assembly at the right end of the gas pipeline, wherein the connecting component and the rotating slot nozzle assembly are connected by welding or other means, and a set of gear rotating devices are provided on the gas pipeline, the gear rotating devices are fixedly mounted on the outside of the gas pipeline, and the device is rotated by the gear rotation. The connecting component is provided with a set of bearings embedded in the gas pipeline, and the bearings are used to connect to the air inlet pipe. The rotating slot nozzle is integrated with the gas pipeline, and the gas pipeline is rotated by the gears so that the slot nozzle completes a 360° rotation, so it is called a rotating slot nozzle. Four airflow control structures that can be translated along the direction of the gas pipeline are provided at the top of the nozzle, which are used to control the size of the gap on the slot nozzle and thus control the amount of airflow. The entire device is made of steel material, which meets the harsh environment on site and has strong wear resistance. The connecting components on the left side of the rotating slot nozzle's gas pipeline include a gas pipeline 7, a bearing 9, and an intake pipe 10. The bearing 9 is embedded in and welded to the inner wall of the gas pipeline. The bearing 9 is used to connect to the intake pipe 10. The bearing's inner diameter is larger than the inner diameter of the gas pipeline and can be set according to actual needs. The intake pipe is inserted into the inner wall of the bearing's inner ring and sealed with sealant to prevent air leakage. The inner diameter of the intake pipe is the same as that of the gas pipeline. The bearing 9 uses a gas-tight bearing to prevent air leakage from the connecting components during the injection process. The bearing can move in a 360-degree circular motion, thereby meeting the rotation requirements of the rotating slot nozzle. The gear rotation device includes a gear 8 installed on the outer wall of the air pipe, a transmission motor 11 for driving the gear rotation, and a PLC intelligent control system 12 for rotating the intelligent control device. The gear can be rectangular, trapezoidal or other types, and there is no requirement for gear selection. A group of motor transmission devices is set outside the gear, and the transmission motor is provided with a gear that matches the gear 8 to drive the air pipe to rotate. The transmission motor is connected to an external voltage and a group of PLC intelligent control systems 12, which are used to intelligently control the transmission motor 11 to rotate the air pipe and thus rotate the slot nozzle. The PLC intelligent control system can control the rotating device to rotate according to a unit rotation angle. The rotation angle can be set according to the number of slot nozzles. For example: four nozzles are set to a unit rotation angle of 90°, and five nozzles are set to a unit rotation angle of 72°, so that there is always one nozzle of the rotating slot nozzle facing upwards and facing the working roller.The rotating slot nozzle assembly includes uniform slot nozzles 5 arranged in the circumferential direction of the air pipe, and the number of nozzles is set to be more than three, so that there is always one nozzle in the working position (facing the working roller) and the previous working position rotates away from the blocked or about to be blocked nozzle to blow to both sides of the strip, avoiding secondary contamination of the strip by the emulsion blockage. The multiple nozzles are provided with air supply holes 3. The rotating slot nozzle is provided with a group of blocking components to prevent the lower nozzle (the nozzle facing the strip) from spraying air flow. The blocking components include blocking balls (6, 15) and tracks (2, 14). The track 2 is located in the circumferential direction of the slot nozzle air guide hole 3. The track diameter is larger than the diameter of the slot nozzle air guide hole. A solid steel blocking ball 6 is installed on the track 2. During the rotation process, it will always roll down to the bottom air guide hole under the action of gravity to block the air flow output, preventing the lower nozzle from spraying emulsion to pollute the strip. Four airflow control devices (4, 13) that can be translated along the direction of the air pipe are arranged at the top of the nozzle. The control structure can perform translational movement independently and is used to independently control the size of the gap on the slot nozzle and thus control the amount of air flow. The gap is 2mm to 10mm, and this range can form a good air knife to blow the emulsion on the surface of the working roll or the emulsion dripping due to condensation away from the roll.

[0019] Installation and working process: refer to Figure 1 — Figure 3 A device for preventing the slot nozzle from being blocked includes a connecting component (gas pipeline 2 7, bearing 9 and air inlet pipe 10) arranged on the left side of the rotating slot nozzle gas pipeline (gas pipeline 1, gas pipeline 2 7), a rotating slot nozzle ( Figure 1 ), and a group of gear rotating devices (gear 8, a transmission motor 11 for driving the gear rotation and a PLC intelligent control system 12 for rotating the intelligent control device) are provided on the gas pipeline (gas pipeline 1, gas pipeline 2, 7). The gear rotating device is installed on the left side of the gas pipeline as far as possible, away from the nozzle, and is fixed on the outside of the gas pipeline (gas pipeline 1, gas pipeline 2, 7). The rotation of the gear 8 drives the gas pipeline (gas pipeline 1, gas pipeline 2, 7) to rotate. The connecting component (gas pipeline 2, 7, bearing 9 and intake pipe 10) is provided with a set of bearings 9 embedded in the gas pipeline. The bearing 9 is used to connect to the intake pipe 10. The rotating slot nozzle ( Figure 1 ) is integrated with the gas pipeline (gas pipeline 1, gas pipeline 2 7), and the gear 8 drives the gas pipeline (gas pipeline 1, gas pipeline 2 7) to rotate so that the slot nozzle ( Figure 1 ) completes 360° rotation, so it is called a rotating slot nozzle. The top of the nozzle is provided with four air flow control structures (4, 13) that can be translated along the direction of the gas pipe to control the slot nozzle ( Figure 1) to control the air flow rate. The entire device is made of steel material, which meets the harsh environment on site and has strong wear resistance.

[0020] When the above device is used, when the working nozzle 5 is blocked or about to be blocked, the transmission motor 11 will be immediately controlled by the PLC intelligent control system 12 and rotate, driving the gear 8 on the gas pipes 1 and 7. The gear 8 is fixedly connected to the gas pipes, thereby rotating the gas pipes, and the slot nozzle ( Figure 1 ) also rotates, and the clean nozzles in the multiple groups of slot nozzles in the circumferential direction of the gas transmission pipes 1 and 7 rotate to replace the nozzles that were originally blocked or about to be blocked, and are continuously rotated for use. The nozzles that were originally blocked or about to be blocked will turn away from the working position and face both sides. The air flow control device continuously adjusts the size of the gap to perform self-cleaning. At the same time, there are still slot nozzles in the working state in the working position. The reciprocating operation avoids nozzle blockage and does not affect the continuity of steel rolling. The lower nozzle air guide hole 3 is always sealed by the blocking ball (6, 15) in the state of air flow obstruction. According to the requirements, the air flow pressure of each nozzle is adjusted to below 0.6MPa to meet the requirements of blowing emulsion. The total air flow pressure is set to the sum of the air flow nozzle pressures according to the actual number of nozzles and the pressure of each nozzle, and the air flow control device is adjusted according to the requirements to meet the wind knife state of different requirements. The invention improves the removal rate of emulsion on the surface of the strip steel, eliminates the influence of emulsion on the surface quality of the strip steel, improves the continuity of steel rolling, and prolongs the service life of the nozzle, increases the operation cycle of the cold-rolled steel strip, reduces the cost of replacing the nozzle, and improves the economic benefits.

[0021] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. A device for preventing slit nozzles from clogging, characterized in that: It includes a connecting component provided on the left side of the rotating slot nozzle gas pipeline and a rotating slot nozzle assembly on the right end of the gas pipeline, wherein the connecting component and the rotating slot nozzle assembly are connected by welding, and a set of gear rotating devices are provided on the gas pipeline, which are fixed to the outside of the gas pipeline and drive the device to rotate through the rotation of the gears; The rotating slot nozzle assembly includes slot nozzles uniformly arranged in the circumferential direction of the gas pipe, and the number of nozzles is set to be more than three, so that there is always one nozzle in the working position, that is, facing the working roll, and the nozzle in the previous working position rotates away from the blocked or about to be blocked nozzle to blow towards both sides of the strip. Gas guide holes are set inside the multiple slot nozzles to supply gas; A group of blocking components are provided inside the rotating slot nozzle assembly to prevent the lower nozzle from spraying airflow. The blocking components include a blocking ball and a track. The track is positioned in the circumferential direction of the slot nozzle air guide hole. The track diameter is larger than the diameter of the slot nozzle air guide hole. A solid steel blocking ball is installed on the track.

2. The device for preventing slot nozzle from clogging according to claim 1, characterized in that: The connecting parts on the left side of the rotary slot nozzle gas pipeline include gas pipeline II (7), a bearing (9) and an air intake pipe (10). The bearing (9) is embedded in and welded to the bearing on the inner wall of the gas pipeline. The inner diameter of the bearing is larger than the inner diameter of gas pipeline II. The air intake pipe is inserted into the inner wall of the bearing inner ring and sealed with sealant. The inner diameter of the air intake pipe is the same as the inner diameter of the gas pipeline.

3. The device for preventing slot nozzle from clogging according to claim 2, characterized in that: The bearing is a gas-sealed bearing, and the bearing performs 360° circular motion.

4. The device for preventing slot nozzle from clogging according to claim 1, characterized in that: The gear rotating device comprises a gear (8) mounted on the outer wall of the gas pipeline, a transmission motor (11) for driving the gear to rotate, and a PLC intelligent control system (12) for intelligently controlling the rotation of the device. A set of motor transmission devices is arranged outside the gear. A gear that matches the gear is arranged on the transmission motor and is used to drive the gas pipeline to rotate. The transmission motor is connected to an external voltage and a set of PLC intelligent control systems for intelligently controlling the transmission motor to rotate the gas pipeline and thereby rotate the slot nozzle. The PLC intelligent control system controls the rotation device to rotate according to a unit rotation angle.

5. The device for preventing slot nozzles from clogging according to claim 4, characterized in that: Four airflow control devices that can move horizontally along the air pipe are set at the top of the nozzle. The control structure moves horizontally alone to control the size of the gap on the slot nozzle and thus the air flow rate. The gap is 2mm~10mm.

6. A method for preventing slot nozzle clogging using the device according to any one of claims 1 to 5, characterized in that: The method is specifically as follows: When the nozzle at the working position is clogged or is about to be clogged, the air supply pipe is controlled by the PLC intelligent control system to drive the motor to rotate, thereby driving the rotating slot nozzle to rotate, so that the clean nozzles in the multiple groups of slot nozzles in the circumferential direction of the air supply pipe replace the original clogged or clogged nozzles, and are continuously rotated to make the clogged nozzles or the nozzles that are about to be clogged turn away from the working position and toward both sides for self-cleaning. At the same time, there are still slot nozzles in working state at the working position, and the air flow pressure of a single nozzle is adjusted to below 0.6MPa as required. The air guide hole of the lower nozzle is always blocked by the ball seal and is in a state of airflow obstruction. The air flow pressure is set to the sum of the air flow nozzle pressures according to the actual number of nozzles and the pressure of a single nozzle, and the air flow control device is adjusted as required to meet the wind knife state with different requirements.

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