Back-up roll device for secondary cooling section of continuous casting machine

Abstract

The utility model belongs to the technical field of ferrous metallurgy continuous casting equipment, and particularly discloses a secondary cooling section back-up roll device of a continuous casting machine, which comprises a back-up roll and a back-up roll shaft, supports are arranged at two ends of the back-up roll shaft, a bearing pack is sleeved on the supports, the back-up roll is sleeved on the outer side of the bearing pack, a plurality of radiating holes are arranged on the supports, and the radiating holes are communicated with the back-up roll. And a water cooling pipe penetrates through every other heat dissipation hole. Under the working condition of high-temperature water vapor, a shaft sleeve and a roller surface of the secondary cooling supporting roller device are abraded rapidly, and the shaft and the roller of the secondary cooling supporting roller device are not provided with a cooling device, so that roller surface abrasion and connecting shaft deformation are accelerated, the secondary cooling supporting roller device fails to rotate, and quality defects such as casting blank indentation and scratch are caused. Deformation caused by thermal expansion is inhibited by heat exchange between the supporting roller and the supporting roller shaft through the water cooling pipe, and air circulation, thermal expansion inhibition, shaft deformation reduction and failure rate reduction of a dead roller are realized by arranging the heat dissipation holes.

Description

Technical Field

[0001] This utility model relates to the technical field of continuous casting equipment in iron and steel metallurgy, and specifically to a support roller device for the second cooling section of a continuous casting machine. Background Technology

[0002] The secondary cooling support roller device of the continuous casting machine is a key piece of equipment that transports the high-temperature billets produced by the continuous casting machine to the straightening machine for straightening and continuous casting. Under high-temperature and steamy conditions, the bushings and roller surfaces of the secondary cooling support roller device wear rapidly. Since the shaft and rollers of the secondary cooling support roller device have no cooling device, the wear of the roller surface and the deformation of the connecting shaft are accelerated, which leads to the failure of the secondary cooling support roller device to rotate, resulting in quality defects such as billet indentation and scratches, causing steelmaking production to be interrupted, with a high equipment failure rate and frequent replacement.

[0003] Patent CN222370332U discloses a roller cooling device for continuous casting processes, comprising a roller body, a mounting base, a first water channel, and a spiral cooling chamber. The left end of the roller body is fixedly mounted on the mounting base. The roller body has a hollow structure, and a first water channel is formed at the center of the roller body. A spiral cooling chamber is formed in the side wall of the roller body. The left end of the first water channel has an outlet that cooperates with the spiral cooling chamber, and the right end of the first water channel has an inlet that cooperates with the spiral cooling chamber. A support frame is provided inside the spiral cooling chamber. This utility model of a roller cooling device for continuous casting processes has a simple structure, practical function, and ingenious design. It effectively solves the problem in the prior art where rollers are usually hollow structures with internal water spray mechanisms for cooling, but this design makes it difficult for the coolant to reach the deep parts of the roller, resulting in poor cooling effect.

[0004] However, the cooling water in the above scheme only passes through the roller, and there is a cavity between the roller shaft and the roller, which cannot cool the roller shaft. In a working environment with high temperature and water vapor for a long time, the deformation of the roller shaft will also cause the roller to die. Utility Model Content

[0005] The purpose of this utility model is to provide a secondary cooling section support roller device for a continuous casting machine, so as to solve the problem that the bushing and roller surface of the secondary cooling support roller device wear rapidly under high temperature and water vapor conditions, which leads to the failure of the secondary cooling support roller device to rotate and causes quality defects such as indentation and scratches on the billet.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a support roller device for the second cooling section of a continuous casting machine, including a support roller and a support roller shaft. The support roller shaft is provided with brackets at both ends, and a bearing assembly is sleeved on the bracket. The support roller is sleeved on the outside of the bearing assembly. The bracket is provided with a plurality of heat dissipation holes, and a water cooling pipe passes through every other heat dissipation hole.

[0007] The principle and beneficial effects of this utility model are as follows: circulating water enters the water-cooling pipe inside the shaft from the inlet, absorbs the heat of the shaft, and is discharged from the outlet. It exchanges heat between the support roller and the support roller shaft through the water-cooling pipe, suppressing the deformation caused by thermal expansion. By opening heat dissipation holes, air can circulate, suppressing thermal expansion, reducing the amount of shaft deformation, and reducing the failure rate of dead rollers.

[0008] Option 2, a preferred embodiment of the basic option, involves a bearing assembly comprising angular contact ball bearings and self-aligning roller bearings. A self-aligning roller bearing and two angular contact ball bearings are fitted onto a bracket near the drive end of the support roller shaft, with the angular contact ball bearings arranged back-to-back. A self-aligning roller bearing is fitted onto a bracket near the non-drive end of the support roller shaft. The self-aligning roller bearing at the drive end allows for a self-aligning angle of 1°-2.5° and primarily bears radial loads, compensating for shaft bending. The angular contact ball bearings, arranged back-to-back in pairs, provide axial positioning, prevent roller body movement, and provide auxiliary radial support. The self-aligning roller bearing at the non-drive end only bears radial loads, allowing for axial thermal expansion displacement and avoiding excessive constraint.

[0009] Option 3, a preferred option of the basic scheme, involves a heat dissipation fin fixedly connected to the outside of the water-cooling pipe. The dense, thin sheet-like structure significantly increases the surface area within a limited space, allowing more heat to come into contact with the air through the surface. This enables rapid heat exchange between the support roller surface and the water-cooling pipe, increasing heat exchange efficiency.

[0010] Option four, a preferred option of option three, uses copper as the material for the water-cooling pipes and heat dissipation fins. Copper has high thermal conductivity, thus improving heat dissipation efficiency.

[0011] Option 5, a preferred embodiment of the basic option, features tapered rims at both ends of the support roller, with chamfered edges. The tapered rims guide the casting billet, preventing it from shifting, and the chamfering prevents scratches on the billet surface.

[0012] Option six, a preferred option of the basic scheme, involves a filter screen fixedly connected to the inlet of the water-cooling pipe. The filter screen intercepts impurities in the water, preventing blockage of the water-cooling pipe and ensuring efficient heat exchange. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a support roller device for the second cooling section of a continuous casting machine according to this utility model;

[0014] Figure 2 This is a left view of a support roller device for the second cooling section of a continuous casting machine according to this utility model;

[0015] Figure 3 yes Figure 2 Sectional view at point A in the middle. Detailed Implementation

[0016] The present invention will be further described in detail below through specific embodiments:

[0017] The reference numerals in the accompanying drawings include: 1-support roller, 2-support roller shaft, 3-bracket, 4-bearing assembly, 5-heat dissipation hole, 6-water cooling pipe, 7-angular contact ball bearing, 8-self-aligning roller bearing, 9-heat dissipation fins, 10-conical rim, 11-filter screen.

[0018] Example

[0019] like Figures 1 to 3 The diagram shows a support roller device for the second cooling section of a continuous casting machine, comprising a support roller 1 and a support roller shaft 2. Support brackets 3 are provided at both ends of the support roller shaft 2, and bearing assemblies 4 are sleeved on the support brackets 3. The support roller 1 is sleeved on the outside of the bearing assembly 4. The bearing assembly 4 includes angular contact ball bearings 7 and self-aligning roller bearings 8. One self-aligning roller bearing 8 and two angular contact ball bearings 7 are sleeved on the support bracket 3 near the driving end of the support roller shaft 2, with the angular contact ball bearings 7 arranged back-to-back. One self-aligning roller bearing 8 is sleeved on the support bracket 3 near the non-driving end of the support roller shaft 2. The inner / outer rings of the self-aligning roller bearing 8 are made of carburized steel (such as G20CrNi2Mo), and the roller surface is plated with hard chrome to improve high-temperature resistance and resistance to micro-peeling. The angular contact ball bearings 7 are made of all-ceramic balls (Si3N4) or hybrid ceramic bearings (steel ring + ceramic balls) to reduce high-speed frictional temperature rise. The support roller 1 has tapered rims 10 at both ends, and the edges of the tapered rims 10 are chamfered. The bracket 3 has several heat dissipation holes 5, and a water cooling pipe 6 passes through every other heat dissipation hole 5. Heat dissipation fins 9 are fixedly connected to the outside of the water cooling pipe 6. The water cooling pipe 6 and the heat dissipation fins 9 are made of copper. A filter screen 11 is fixedly connected to the water inlet of the water cooling pipe 6. The heat dissipation holes 5 without water cooling pipes 6 are connected to the suction pipe, and the suction pipe is connected to the exhaust fan.

[0020] In this embodiment, circulating cooling water enters the water-cooling pipe 6 through the inlet. As the water flows through the copper water-cooling pipe 6, it absorbs the heat transferred from the support roller shaft 2 and the support roller 1. The filter screen 11 at the inlet intercepts impurities in the water, preventing blockage of the water-cooling pipe. The high-temperature water, after absorbing heat, is discharged from the outlet and enters the external cooling system for cooling before recirculation. The copper heat dissipation fins 9 fixed on the outside of the water-cooling pipe 6 significantly increase the heat dissipation surface area through their dense, thin-plate structure, accelerating the release of heat to the surrounding air. Simultaneously, the heat dissipation holes 5 on the bracket 3 that are not equipped with water-cooling pipes are connected to the external air intake pipe. When the exhaust fan is activated, a forced airflow is formed, promoting air circulation and further removing heat from the surfaces of the heat dissipation fins 9 and the support roller shaft 2, achieving active heat dissipation.

[0021] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A secondary cooling section support roller device of a continuous casting machine, characterized by, Including support roller (1) and support roller shaft (2), both ends of support roller shaft (2) are equipped with support (3), bearing group (4) is sleeved on support (3), support roller (1) is sleeved with bearing group (4) outside, a plurality of heat dissipation holes (5) are formed in support (3), every other heat dissipation hole (5) is penetrated by a water cooling pipe (6).

2. A device for supporting the secondary cooling segment rollers of a continuous casting machine according to claim 1, characterized in that Bearing group (4) includes angular contact ball bearing (7) and self-aligning roller bearing (8), one self-aligning roller bearing (8) and two angular contact ball bearings (7) are sleeved on the support (3) near the drive end of support roller shaft (2), the angular contact ball bearings (7) are arranged back to back, a self-aligning roller bearing (8) is sleeved on the support (3) near the non-drive end of support roller shaft (2).

3. A device for supporting the secondary cooling segment rollers of a continuous casting machine according to claim 1, characterized in that, The outer side of water cooling pipe (6) is fixedly connected with heat dissipation fin (9).

4. A device for supporting the secondary cooling segment rollers of a continuous casting machine according to claim 3, characterized in that, The material of water cooling pipe (6) and heat dissipation fin (9) is copper.

5. A secondary cooling segment support roller device for a continuous caster as defined in claim 1, wherein Both ends of support roller (1) are equipped with tapered wheel rail (10), and the edge of tapered wheel rail (10) is chamfered.

6. A secondary cooling segment support roller device for a continuous caster as defined in claim 1, wherein The water inlet of water cooling pipe (6) is fixedly connected with filter screen (11).

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