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CN-121988625-A - Hot continuous rolling mill and cleaning method

CN121988625ACN 121988625 ACN121988625 ACN 121988625ACN-121988625-A

Abstract

A hot continuous rolling mill and a cleaning method belong to the technical field of rolling, the hot continuous rolling mill comprises a mill body, a cleaning box is fixedly installed on the mill body, an air box is arranged in the cleaning box, the air box is fixedly connected with a connecting handle through an air pipe, the connecting handle is detachably connected with a nozzle, the connecting handle is inserted on the cleaning box and is hinged with a connecting rod, a cleaning plate is fixedly arranged at the end part of the connecting rod, and the cleaning plate is positioned in front of an outlet of the nozzle. The integrated pneumatic cleaning and mechanical cleaning, the synergistic effect of air flow cleaning and cleaning plate scraping, the continuous rigid lamination of cleaning components and the roller surface is not needed, the unidirectional pressure born by the roller shaft end is greatly reduced, the roller stress is more balanced, the possibility of bending deformation of the roller in the long-term operation process is reduced, the vibration probability of the roller is reduced, and the rolling stability in the hot continuous rolling process is improved.

Inventors

  • Sui dongye
  • GUO JIANYU
  • LIU JIALIN
  • WANG HONGJIU
  • TANG RIHUI
  • ZHANG MINGJIN
  • ZHANG WANLONG
  • WANG CHAO
  • ZHANG HAO
  • WANG SHUOXUN
  • WANG ZHUAN
  • WANG KEZHU
  • ZHANG WENHU
  • LI HE
  • XU GUANG
  • HE ZHIQIANG
  • XU PENGFEI
  • ZHONG JIANHUA
  • WANG BIN
  • WEN XIONG

Assignees

  • 山东钢铁集团日照有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. A hot continuous rolling mill comprises a mill body (1), and is characterized in that a cleaning box (2) is fixedly arranged on the mill body (1), an air box (9) is arranged in the cleaning box (2), the air box (9) is fixedly connected with a connecting handle (4) through an air pipe (3), the connecting handle (4) is detachably connected with a nozzle (21), the connecting handle (4) is inserted and installed on the cleaning box (2), the connecting handle (4) is hinged with a connecting rod (7), a cleaning plate (8) is fixedly arranged at the end part of the connecting rod (7), and the cleaning plate (8) is positioned in front of an outlet of the nozzle (21).
  2. 2. The hot continuous rolling mill according to claim 1, wherein a spiral rectifying section (22), a stepped convergence accelerating section (23), an induction accelerating section (24) and an eccentric nozzle section (25) are sequentially arranged in the nozzle (21) along the air flow direction, the spiral rectifying section (22) is used for air flow energy conservation, the stepped convergence accelerating section (23) is of a multi-stage stepped contraction structure and is used for multi-stage speed transition of air flow, the induction accelerating section (24) is used for improving jet flow momentum, and the eccentric nozzle section (25) is used for destroying axisymmetric backflow and enhancing impact force.
  3. 3. The hot continuous rolling mill according to claim 2, wherein the spiral rectifying section (22) includes a spiral rib (221) fixedly provided on an inner wall of the nozzle (21), the spiral rib (221) is of a continuous spiral convex structure, and a spiral direction of the spiral rib (221) is in the same direction as a flow direction of the air flow.
  4. 4. A hot tandem rolling mill according to claim 3, characterized in that the bar height of the helical bars (221) is 0.3-0.6mm.
  5. 5. The hot tandem rolling mill according to claim 2, wherein the stepped convergence accelerating section (23) includes a plurality of constrictions (231) and pressure stabilizing chambers (232) alternately arranged in the air flow direction, the constrictions (231) decreasing in inner diameter stepwise in the air flow direction.
  6. 6. The hot continuous rolling mill according to claim 2, characterized in that the induction accelerating section (24) comprises an inner tube (241) and an outer tube (242) which are coaxially arranged, the inner tube (241) is communicated with the stepped convergence accelerating section (23), the outer tube (242) is close to the outlet of the inner tube (241), a gap is arranged between the outer tube (242) and the inner tube (241), a plurality of drainage holes (243) are arranged on the outer tube (242), and the outer tube (242) is communicated with the outside air.
  7. 7. Hot tandem rolling mill according to claim 2, characterized in that the eccentric jet section (25) has an eccentric amount of 5% -15% of its outlet diameter, the axis being deflected by 3 ° -8 °.
  8. 8. The hot continuous rolling mill according to claim 1, characterized in that a partition plate (10) is fixedly arranged in the cleaning box (2), a bellows (9) is arranged above the partition plate (10), a storage cavity (12) is arranged below the partition plate (10) and used for storing the air pipe (3), a connecting pipe (11) is fixedly arranged on the partition plate (10), the air pipe (3) is connected with the bellows (9) through the connecting pipe (11), and a socket (13) used for connecting the inserting of the grip (4) is formed in the cleaning box (2).
  9. 9. A cleaning method, characterized by using the hot continuous rolling mill according to any one of claims 2-7, comprising the steps of pulling out an air pipe (3), aligning a nozzle (21) with impurities to be cleaned, enabling air flow generated in an air box (9) to flow into the nozzle (21) through the air pipe (3), enabling the air flow to sequentially flow through a spiral rectifying section (22), a stepped convergence accelerating section (23), an induction accelerating section (24) and an eccentric nozzle section (25), and blowing the impurities from a machine body (1) through high-jet air flow.
  10. 10. Cleaning method according to claim 9, characterized in that the connecting rod (7) connected to the bottom of the grip (4) is turned over when the refractory impurities cannot be blown off by means of the air flow alone, so that the cleaning plate (8) is located at the front end of the nozzle (21), the refractory impurities on the machine body (1) are scraped off by means of the cleaning plate (8), and the nozzle (21) simultaneously sprays the air flow during the scraping off.

Description

Hot continuous rolling mill and cleaning method Technical Field The invention relates to the technical field of rolling, in particular to a hot continuous rolling mill and a cleaning method. Background The hot continuous rolling mill is a rolling device for producing hot rolled coils, after raw materials are preheated, rough rolling is carried out through a plurality of rolling mill working stations, the thickness of the plate is gradually reduced, then the plate is precisely rolled for a plurality of times, the required specification and performance index are obtained, after the plate is rapidly cooled, the manufactured steel plate is finally coiled into coils or cut into sheets. In the process of processing, the hot continuous rolling mill is easy to remain heating impurities on the roller, and if the impurities are not cleaned timely, refractory impurities can be formed to influence subsequent production quality, so that the processing requirement cannot be met. In addition, the scraping plate can cause the problem of local excessive abrasion due to friction, so that the joint gap between the scraping plate and the roller is gradually increased, the impurity removing effect is continuously attenuated, the scraping plate needs to be replaced frequently, and the equipment maintenance cost and the downtime are increased. Disclosure of Invention The invention provides a hot continuous rolling mill and a cleaning method for solving the technical problems that the existing scraper structure in the background technology is poor in flexibility, incomplete in impurity removal, easy to cause rolling defects due to impurity residues and influence the service life of a roller. The technical scheme of the invention is as follows: The invention provides a hot continuous rolling mill, which comprises a mill body, wherein a cleaning box is fixedly arranged on the mill body, an air box is arranged in the cleaning box and is fixedly connected with a connecting handle through an air pipe, the connecting handle is detachably connected with a nozzle and is inserted and installed on the cleaning box, the connecting handle is hinged with a connecting rod, the end part of the connecting rod is fixedly provided with a cleaning plate, and the cleaning plate is positioned in front of an outlet of the nozzle. The integrated pneumatic cleaning and mechanical cleaning, the synergistic effect of air flow cleaning and cleaning plate scraping, the continuous rigid lamination of cleaning components and the roller surface is not needed, the unidirectional pressure born by the roller shaft end is greatly reduced, the roller stress is more balanced, the possibility of bending deformation of the roller in the long-term operation process is reduced, the vibration probability of the roller is reduced, and the rolling stability in the hot continuous rolling process is improved. Preferably, the inside of the nozzle is sequentially provided with a spiral rectifying section, a stepped convergence accelerating section, an induction accelerating section and an eccentric nozzle section along the gas flow direction, wherein the spiral rectifying section is used for air flow energy conservation, the stepped convergence accelerating section is of a multi-stage stepped shrinkage structure and is used for multi-stage speed transition of air flow, the induction accelerating section is used for improving jet flow momentum, and the eccentric nozzle section is used for destroying axisymmetric backflow and enhancing impact force. The device realizes progressive optimization from energy conservation and acceleration to enhanced impact of the air flow, the spiral rectifying section can reduce energy loss of the air flow in the conveying process, the stepped convergence accelerating section enables the air flow to realize multiple speed transitions through the multistage stepped shrinkage structure, the air flow speed is greatly improved, the acceleration section is induced to further improve jet flow momentum, the air flow has stronger kinetic energy, the eccentric nozzle section breaks axisymmetric backflow, the air flow impact is more targeted, impact force on impurities on the surface of a roller is greatly enhanced, the attached heating impurities can be efficiently stripped, the cleaning efficiency and effect are improved, the possibility that the impurities remain to form stubborn stains is reduced, and a stable roller surface state is provided for a subsequent rolling process. Preferably, the spiral rectifying section comprises spiral ribs fixedly arranged on the inner wall of the nozzle, the spiral ribs are of continuous spiral bulge structures, the spiral direction of the spiral ribs is in the same direction as the flow direction of the airflow, the main flow of the airflow can be guided to maintain a stable state of axial non-rotation, meanwhile, the airflow near the wall layer is driven to move along the axial stable direction and pulled away along th