Dead head heat preservation cover special for large normal-method roller

Abstract

The utility model provides a special riser heat preservation cover for a large normal method roller, which belongs to the technical field of roller casting in the metallurgical industry and comprises a cylindrical shell (2), a hanging ring (1) fixed in the center of the top of the shell (2) and heat preservation asbestos (5) fixedly arranged in the shell (2) through a group of steel bar anchor hooks (4). By using the heat-insulating cover of the heat-insulating riser, the size of the riser can be reduced, and the process yield of the roller is improved; the operation procedure is simplified, the labor intensity of workers is reduced, and the labor condition is improved; and the consumption of molten metal and the use of energy are reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of roll casting in the metallurgical industry, and in particular relates to a special riser insulation cover for a large conventional roll. Background Art

[0002] Riser refers to the supplementary part added on the top or side of the casting to avoid defects in the casting. The cavity of the riser is a cavity for storing liquid metal. It supplies metal when the casting is formed. It has the functions of preventing shrinkage, shrinkage, exhaust and slag collection. The excess part is removed after cooling. The main function of the riser is to compensate for shrinkage. According to the different design functions of the riser, its form, size and opening position are different.

[0003] Roll casting includes conventional casting and centrifugal casting. Large conventional rolls are large rolls made using conventional casting methods. They are widely used in the steel industry to roll various steel products.

[0004] With the rapid development of science and technology, the performance and quality of rolls are increasingly valued. In the traditional casting roll feeding process, the riser metal consumption is large, the process is complicated and the efficiency is low.

[0005] In the casting process of the roll, after the roll is cast, if the surface of the riser is not treated with insulation and heating, the entire end of the riser will have defects such as pores, shrinkage holes, shrinkage, etc., causing the neck to be useless, and it needs to be processed when it is used, resulting in a waste of resources. Therefore, in order to prevent the shrinkage of the riser, the surface of the riser needs to be treated with insulation and heating to ensure that the casting liquid in the riser solidifies sequentially and guarantees shrinkage compensation, thereby obtaining a dense neck structure.

[0006] An existing method is to use a riser oxygen blowing heating method, which requires two operations, each of which takes 5 to 7 minutes, with an interval of 50 minutes each time, and the entire insulation process lasts for more than 1 hour. Due to the high temperature environment on site, the labor intensity of workers is high and the consumption cost is high. Another insulation method is to use an insulation agent for insulation, such as an electric heating riser insulation deoxidation covering agent proposed in a Chinese patent application (application number 200910058353.6), and a Chinese patent application (application number 201410853694.3) also discloses a riser insulation agent for a roll core. This method has the disadvantages of poor insulation effect and poor spreadability, and because the material cannot be reused, it will also pollute the environment.

[0007] Therefore, it is necessary to design a reasonable roll riser insulation cover. Summary of the invention

[0008] The present invention is proposed to solve the problems existing in the prior art.

[0009] The utility model adopts the following technical scheme to achieve the purpose: a large conventional roll riser insulation cover, comprising a cylindrical shell, a hanging ring fixed at the center of the top of the shell, and the key is that the insulation cover also includes insulation asbestos fixed inside the shell through a group of steel bar anchor hooks.

[0010] Furthermore, 3-4 lifting ears are evenly arranged on the outer side of the circumference of the shell.

[0011] Furthermore, the height of the shell is 150-200 mm.

[0012] Furthermore, one end of the steel bar anchor hook is bent.

[0013] Furthermore, the steel bar anchor hooks are welded inside the shell, and the longitudinal spacing between the steel bar anchor hooks is 100-120 mm, and the transverse spacing is 60-80 mm.

[0014] Furthermore, the shell is welded with 7-10 mm thick carbon steel plates.

[0015] Furthermore, the thermal insulation asbestos covers the inner surface of the shell, and the thermal insulation asbestos is arranged flush with the port of the shell.

[0016] Roller riser insulation cover is an important equipment in the roll manufacturing industry to improve roll quality, save materials and protect the environment. Through effective insulation measures, it reduces defects such as pores, shrinkage holes and shrinkage in cast rolls, improves the density of the riser neck structure, and thus significantly improves the overall performance and service life of the roll.

[0017] The utility model has the beneficial effects of uniform and slow cooling during casting of large-scale rolling rolls, reducing the internal stress of the material and obtaining a rolling roll with high-quality performance; the heat-insulating cover completely covers the riser part, thus minimizing heat loss.

[0018] By using the utility model, not only the riser size can be reduced and the process yield rate of castings can be improved, but also the consumption of molten metal and the use of energy can be reduced, the production cost can be reduced, the secondary continuous pouring riser operation process can be simplified, and at the same time, the diffusion of dust can be prevented, the labor intensity of workers can be reduced, and the working conditions can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the front view of the utility model;

[0020] Figure 2 It is a top view of the utility model;

[0021] Figure 3 This is a schematic diagram of the arrangement of steel bar anchor hooks;

[0022] Figure 4 A schematic diagram of an embodiment of a steel bar anchor hook;

[0023] Figure 5 This is a schematic diagram of the utility model in use.

[0024] In the figure: 1: lifting lug; 2: outer shell; 3: lifting lug; 4: steel bar anchor hook; 5: thermal insulation asbestos; 6. thermal insulation cover; 7: roller riser. DETAILED DESCRIPTION

[0025] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0026] The utility model proposes a special riser insulation cover for large conventional rolling mill rolls. Figure 1 , including a cylindrical shell 2, a lifting ring 1 fixed at the top center of the shell 2, and an insulating asbestos 5 fixed inside the shell 2 through a group of steel anchor hooks 4.

[0027] The steel anchor hooks 4 and the thermal insulation asbestos 5 inside the shell 2 form a use surface of the thermal insulation cover. The use surface of the thermal insulation cover is circular and evenly distributed inside the shell 2.

[0028] The lifting ring 1 is used to lift the heat-insulating cover onto the roller riser 7 .

[0029] In order to facilitate the installation and removal of the heat preservation cover, 3-4 lifting ears 3 are evenly arranged on the outer circumference of the shell 2. In this embodiment, 3 lifting ears 3 are arranged evenly at an angle of 120°. Figure 2 shown.

[0030] The overall size of the heat preservation cover is determined according to the specific casting roll riser size, and the height of the shell 2 is 150-200mm. The thickness of the heat preservation asbestos 5 is set according to the height of the shell 2, and the range is 150-200mm.

[0031] See also Figure 4 One end of the steel anchor hook 4 is bent into a fishhook shape, wherein the arc radius is 40-60 mm. The bent end of the steel anchor hook 4 has 1-4 bent portions, and multiple bent portions can reduce the number of steel anchor hooks 4. In this embodiment, the steel anchor hook 4 has 2 symmetrical bent portions.

[0032] See also Figure 3 The straight edge end (non-bent end) of the steel anchor hook 4 is welded inside the shell 2. The steel anchor hook 4 is perpendicular to the shell 2 and may also have a certain angle. The length of the steel anchor hook 4 does not exceed the thickness of the thermal insulation asbestos 5.

[0033] The steel anchor hooks 4 are arranged radially with the center of the shell 2 as the center, and the bent ends are free ends, which can effectively fix the thermal insulation asbestos 5 inside the shell 2. The longitudinal spacing (i.e., the direction of diffusion from the center of the shell 2) between the steel anchor hooks 4 is 100-120mm, and the transverse spacing is 60-80mm.

[0034] The outer shell 2 is formed by rolling and welding ordinary carbon steel plates with a thickness of 7-10 mm, and the lifting ring 1 and the lifting lug 3 are thickened ordinary carbon steel plates.

[0035] The thermal insulation asbestos 5 covers the inner surface of the shell 2, and the thermal insulation asbestos 5 is arranged flush with the port of the shell 2, that is, the thermal insulation asbestos 5 fills the shell 2. When in use, the thermal insulation asbestos 5 is in direct contact with the riser end of the roller.

[0036] See also Figure 5 Assuming that the diameter of the roller riser 7 is 910 mm and the diameter of the heat preservation cover is 1200 mm, after the roller casting is completed, the heat preservation cover 6 is placed on the end surface of the roller riser 7 through the lifting ring 1, which can reduce the cooling speed of the liquid in the riser after casting and play an effective shrinkage compensation role.

[0037] After completion, remove the heat preservation cover 6 through the lifting ring 1 and the lifting ear 3.

[0038] Experiments show that the heat preservation cover provided by the utility model can be used repeatedly for 80 times and has a long service life.

[0039] By using heat-insulating risers, the size of the risers can be reduced and the process yield of the rolls can be improved; the operating procedures can be simplified, the labor intensity of workers can be reduced, and the working conditions can be improved; the consumption of molten metal and the use of energy can be reduced, and the production costs can be reduced.

Claims

1. A large conventional roll riser insulation cover, comprising a cylindrical shell (2), a hanging ring (1) fixed at the top center of the shell (2), characterized in that: The heat-insulating cover also includes heat-insulating asbestos (5) fixedly arranged inside the outer shell (2) by a group of steel bar anchor hooks (4).

2. A large conventional roll riser insulation cover according to claim 1, characterized in that: 3-4 lifting ears (3) are evenly arranged on the outer circumference of the shell (2).

3. A large conventional roll riser insulation cover according to claim 1, characterized in that: The height of the housing (2) is 150-200 mm.

4. A large conventional roll riser insulation cover according to claim 3, characterized in that: The thickness of the thermal insulation asbestos (5) is 150-200 mm.

5. A special riser insulation cover for large conventional rolls according to claim 1, characterized in that: One end of the steel bar anchor hook (4) is bent.

6. A large conventional roll riser insulation cover according to claim 5, characterized in that: The bent end of the steel bar anchor hook (4) has 1 to 4 bent parts.

7. A large conventional roll riser insulation cover according to claim 5 or 6, characterized in that: The non-bent ends of the steel bar anchor hooks (4) are welded inside the outer shell (2), and the longitudinal spacing between the steel bar anchor hooks (4) is 100-120 mm, and the transverse spacing is 60-80 mm.

8. The large conventional roll riser insulation cover according to claim 1, characterized in that: The housing (2) is welded from carbon steel plates with a thickness of 7-10 mm.

9. A large conventional roll riser insulation cover according to claim 1, characterized in that: The thermal insulation asbestos (5) covers the inner surface of the outer shell (2), and the thermal insulation asbestos (5) is arranged flush with the port of the outer shell (2).

Images