CN111375640A

CN111375640A - Mechanical dephosphorization device for iron oxide on surface of steel billet

Info

Publication number: CN111375640A
Application number: CN201811652089.4A
Authority: CN
Inventors: 黄玮钢; 李强
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2018-12-31
Filing date: 2018-12-31
Publication date: 2020-07-07

Abstract

The invention discloses a mechanical dephosphorization device for iron oxide on the surface of a billet, which is a roller type cleaning roller driven by a motor through a universal coupling, wherein the cleaning roller rotates, a disc cutter on the cleaning roller strikes iron oxide scales to remove the iron oxide scales, the cleaning roller is 6 rows of uniform support shafts on a support plate, disc type cleaning blades are fully distributed on the support shafts, grooves are uniformly distributed on the outer circumferential surface of each disc type cleaning blade at intervals, a cutting edge is formed between the top edge of each groove and the outer edge of each disc type cleaning blade, the aperture of a central hole of each disc type cleaning blade is larger than the diameter of the support shaft, and the lifting of the cleaning roller is realized through a hydraulic cylinder. The scale on the surface layer of the heated billet is removed in a mechanical mode, the descaling efficiency of the billet is improved, the service life of equipment is prolonged, and the utilization rate of a site, investment and maintenance cost are reduced.

Description

Mechanical dephosphorization device for iron oxide on surface of steel billet

Technical Field

The invention relates to a mechanical dephosphorization device for iron oxide on the surface of a billet.

Background

In the hot rolling production process of a steel rolling mill, after a steel billet is heated by a heating furnace, the steel billet is oxidized at a high temperature, iron scales which are difficult to peel are formed on the surface of the steel billet, and the thickness of an iron scale strip is gradually increased along with the increase of the heating time. If the scale cannot be removed before rolling, the scale can be pressed into the surface of the steel strip by the rollers during rolling, and the surface quality of the steel strip is affected. The residual iron oxide scale can also accelerate the abrasion of the roller and reduce the service life of the roller. Therefore, it is necessary to remove the scale on the surface before billet rolling.

At present, high-pressure water dephosphorization equipment is commonly adopted in various steel mills at home and abroad, and the scale on the surface layer of the billet is removed by using the mechanical impact force of high-pressure water. The high-pressure water dephosphorization equipment is uniform in form, but has great difference in arrangement according to the requirements of product process and product shape.

The search literature discloses: the situation that the high-pressure water is sprayed frequently or is not descaled due to the fact that the impurity content of turbid circulating water is large and the valve cores of two groups of reversing valves are blocked frequently is stated in the defect analysis and improvement measures of the high-pressure water dephosphorization system in the No. 1 stage of volume 39 of 2 months 2011 of Shijian Feng, Wangqiang in modern metallurgy; "because the rolling rhythm is fast, high pressure water pump is in high pressure operating condition 62.5% of the time, is unfavorable for the life of water pump motor, machinery and seal spare part. The high-pressure water pump plunger and the sealing box body need to be overhauled once every two months according to field statistics; the air compressor has high operation cost and high manufacturing cost of a piston, a valve plate and the like, and the energy accumulator belongs to a high-pressure container, and the wall thickness is gradually thinned every year when the service life exceeds 10 years, so that great potential safety hazards exist.

Through various literature platform searches, the adoption of mechanical dephosphorization equipment or similar technologies in a hot rolling mill is not found.

From the above information, it is found that the impurity content of the turbid circulating water is required to be high in order to avoid the clogging of the high-pressure water nozzle during the operation of the hot rolling mill. And the main body, the auxiliary equipment and the water circulation system for removing phosphorus by using high-pressure water occupy a larger field, and a high-power variable-frequency water pump and an automatic control system are required to be put into the system, so that the one-time investment and the later maintenance cost are higher.

Disclosure of Invention

The invention aims to provide a mechanical dephosphorization device for iron oxide on the surface of a steel billet, which is used for mechanically removing the iron oxide on the surface of the heated steel billet, improving the descaling efficiency of the steel billet, prolonging the service life of equipment, and reducing the utilization rate, investment and maintenance cost of a site.

The invention aims to realize the mechanical dephosphorization device for the iron oxide on the surface of the billet, the device is a roller type cleaning roller driven by a motor through a universal coupling, the cleaning roller rotates, a disc cutter on the cleaning roller strikes the iron oxide scale to remove the iron oxide scale, the cleaning roller is 6 rows of support shafts uniformly arranged on a support plate, disc type cleaning blades are fully distributed on the support shafts, grooves are uniformly distributed on the outer circumferential surface of the disc type cleaning blades at intervals, a cutting edge is formed between the top edge of each groove and the outer edge of each disc type cleaning blade, the aperture of a central hole of each disc type cleaning blade is larger than the axial diameter of each support shaft, and the lifting of the cleaning roller is realized through a hydraulic cylinder.

The roller cleaning roller is rotated under the driving of the main motor, so that the disc blade is thrown out all around under the action of centrifugal force, the disc blade strikes the iron scale by means of inertia and kinetic energy when contacting the upper surface of the steel billet, and meanwhile, the disc blade can rotate automatically and can move in the reciprocating direction, the movement distance is 22mm, the defect that the surface of the steel billet is uneven is compensated, and the impact is reduced.

The cleaning roller supporting plate is formed by welding a semicircular plate on a roller in the middle, the semicircular plate is welded in a staggered mode, a disc blade is installed without a dead angle, and the dead angle is not formed in the cleaning of iron oxide sheets. The disc cutter is of a quincunx shape, and the outer circle of the disc cutter is provided with a blade, so that the disc cutter plays a role in striking and cutting. The main motor has frequency conversion speed regulation and energy consumption braking function. The speed of the main motor is adjusted according to the running speed of the roller way, so that the effect of removing the iron scale is in the best state. The cleaning roller is driven up and down by a hydraulic cylinder, a displacement sensor is arranged in the hydraulic cylinder and used for detecting the position of the cleaning roller, a hydraulic system is provided with a hydraulic lock, and when a hydraulic station stops pumping suddenly at a high position, the cleaning roller cannot fall down, so that accidents happen. The iron scale cleaned falls into the trench and is cleaned manually.

The main motor of the mechanical descaling device adopts variable frequency speed regulation and has an energy consumption braking function. The lifting hydraulic cylinder of the cleaning roller is controlled by a solenoid valve to descend and ascend. The running position of the steel billet is detected by 3 sets of correlation photoelectric switches. The functions of 3 sets of photoelectric switches are respectively as follows: the 1 st set is arranged at 3800mm in front of the main machine, the installation height of the 1 st set is 80mm higher than the roller way surface, and the 1 st set is used for detecting incoming billet signals. The No. 2 set is arranged at the position 1200mm in front of the main machine, the installation height is 190mm higher than the roller way surface, and the No. 2 set is used for distinguishing billet incoming signals of 100mm and billet incoming signals of 200 mm. And the 3 rd sleeve is arranged 3000mm behind the main machine, the installation height is 80mm higher than the roller way surface, and the 3 rd sleeve is used for confirming whether the billet exists in the area. The automatic control system is controlled by a Siemens S7-300 PLC. Controlling the action of the iron scale removing machine. The operation is as follows: removing iron sheet, not removing iron sheet, operating beside machine, and centralized operation. The iron sheet removing and the iron sheet not removing are both automatically controlled, and the operation beside the machine is only used for maintenance and debugging. The automatic control of the process of removing the iron scale can be automatically realized without manual intervention. Normally working in a descaled state. Once the iron scale removing machine fails, the machine is switched to not to be removed, and the roller way in the area normally operates without influencing production. And when the condition allows, the fault is processed, and the normal work is recovered after the fault is repaired.

The invention has the beneficial effects that: technical standard aspects. The effect of the mechanical phosphorus removal device on removing the iron scale on the surface of the steel billet can reach the technical standard of high-pressure water phosphorus removal equipment; investment cost. The total investment cost of the mechanical dephosphorization equipment is reduced by 30 percent compared with that of high-pressure water dephosphorization equipment; in terms of space utilization. Compared with the high-pressure water dephosphorization equipment, the mechanical dephosphorization equipment does not need a space field required by water system support (a water system pipeline and a water pump station) except an online equipment body; the mechanical phosphorus removal device can completely replace a high-pressure water phosphorus removal device, reduces the dependence on a water system, and reduces the consumption of industrial water.

Drawings

The present invention will be described in further detail below with reference to the accompanying drawings.

FIG. 1 is a diagram of a process arrangement according to the present invention;

fig. 2 is a schematic view of the working structure of the disc type cleaning blade of the present invention.

Detailed Description

A mechanical dephosphorization device for iron oxide on the surface of a billet is shown in figures 1 and 2, the device is a roller type cleaning roller 1 driven by a motor through a universal coupling, the cleaning roller 1 rotates, a disc cutter on the cleaning roller 1 strikes the iron oxide scale on a billet 5 to remove the iron oxide scale, the cleaning roller is a support shaft 3 uniformly distributed on a support plate in 6 rows, disc type cleaning blades 2 are fully distributed on the support shaft 3, grooves 4 are uniformly distributed on the outer circumferential surface of the disc type cleaning blades 2 at intervals, a cutting edge is formed between the top edge of each groove 4 and the outer edge of each disc type cleaning blade 2, the aperture of a central hole of each disc type cleaning blade 2 is larger than the diameter of the support shaft 3, and the lifting of the cleaning roller is realized through a hydraulic cylinder.

Claims

1. A mechanical dephosphorization device for iron oxide on the surface of a steel billet is characterized in that: the device passes through universal coupling driven drum-type cleaning roll for the motor, and the cleaning roll is rotatory, and the disc cutter on the cleaning roll strikes the iron scale, makes the iron scale remove, and the cleaning roll is even 6 rows of back shafts in the backup pad, is covered with disc type cleaning blade on the back shaft, and the equipartition interval is setting up the recess on the outer periphery of disc type cleaning blade, constitutes the cutting edge between recess apical margin and the outer fringe of disc type cleaning blade, and the centre bore aperture of disc type cleaning blade is greater than the axle footpath of back shaft, the lift of cleaning roll is realized through the pneumatic cylinder.