CN212598757U

CN212598757U - Secondary cooling one-section structure of high-pulling-speed medium-thickness slab continuous casting machine

Info

Publication number: CN212598757U
Application number: CN202021268764.6U
Authority: CN
Inventors: 吴克甬; 朱金雄; 管炜
Original assignee: Wuhan Xisai Metallurgical Engineering Co ltd
Current assignee: Wuhan Xisai Metallurgical Engineering Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-02-26
Anticipated expiration: 2030-07-01

Abstract

The utility model discloses a two cold one section structures of thick slab caster in high pulling speed, technical scheme includes corresponding outer arc frame and inner arc frame, the inboard correspondence of outer arc frame and inner arc frame is equipped with the merogenesis roller, the upper segment of outer arc frame is equipped with the upper hydraulic cylinder, and the hypomere is equipped with down the hydraulic cylinder, the inner arc frame is equipped with the upper articulated support that corresponds with the upper hydraulic cylinder and the lower articulated support that corresponds with lower hydraulic cylinder, the piston rod front end of upper hydraulic cylinder is articulated with the upper articulated support, and the piston rod front end of lower hydraulic cylinder is articulated with lower articulated support; the bottom panel of outer arc frame extends to inner arc frame bottom below, the inner arc frame side of panel is equipped with horizontal spacing track, go up hinged support is located in the horizontal spacing track. The utility model discloses simple structure, easily operation, production efficiency height, product quality are good, adapt to the requirement of high casting speed medium-thickness slab continuous casting.

Description

Secondary cooling one-section structure of high-pulling-speed medium-thickness slab continuous casting machine

Technical Field

The utility model relates to a conticaster field, specific two cold one section structures of thick slab caster in high pulling speed that says so.

Background

In order to increase the output of the continuous casting machine, the method of increasing the drawing speed of the continuous casting machine is the most effective means and is the development trend of the continuous casting machine at present. However, after the drawing speed is increased, the metallurgical length of the continuous casting machine is lengthened, so that the thickness of a blank shell at the same position of the continuous casting machine is reduced, and the bulging and the steel leakage of a casting blank are easily caused. In a continuous casting machine for medium and thick plate blanks, bulging phenomenon is particularly obvious and needs to be overcome seriously.

Bulging refers to the bulging of a casting blank shell with a liquid core, which cannot resist the action of hydrostatic pressure of molten steel, forming bulges around the casting blank, and the medium plate blank mainly prevents the bulging of a wide surface. The severe bulging can cause the quality defects of products such as longitudinal internal cracks of the wide surface of the plate blank, cracks of a triangular area, center segregation, center looseness, bleed-out and the like, and the production safety.

Theoretically, bulging can occur in the full metallurgical length, the bulging deformation amount of the wide surface is the largest in the range from the meniscus of the crystallizer to the distance of 5m from the meniscus, and the range is just the interval of the second cooling section. After the pulling speed of the same bedplate blank continuous casting machine is increased, bulging deformation of the second cooling section is obviously increased.

According to the structure of the secondary cooling section (shown in figure 1) of the traditional slab caster, an inner arc frame and an outer arc frame are fixedly connected through an upper connecting screw and a lower connecting screw, the sizes of roll gaps of an upper opening and a lower opening are determined by increasing and decreasing adjusting shim packs, and the roll gap of the secondary cooling section forms an inverted cone (shown in figure 2) along the movement direction of a casting blank so as to adapt to volume shrinkage in the solidification process of the casting blank. On one hand, the roll diameter and the roll distance of the sectional roll are large due to low drawing speed of the traditional secondary cooling section, the back taper formed by the roll gap can only be adjusted on line, the back taper is an empirical reference value according to different steel types and different sections, the blank drawing resistance is increased due to the fact that the back taper is too large frequently, and steel leakage caused by the fact that a casting blank is broken due to hard dragging can occur in severe cases; the casting blank is severely bulged when the back taper is too small, and the structure is only suitable for a low-drawing-speed medium plate blank continuous casting machine. On the other hand, the adjustment mode is only limited to manual empirical adjustment, the work load of adjusting the roll gap is large, the roll gap can be adjusted outside the line, the accuracy is poor, time and labor are wasted, the production efficiency is reduced, and when different pouring section surfaces need to be replaced, the two-cold-one section is often required to be replaced.

Disclosure of Invention

The utility model aims at solving the technical problem, provide a simple structure, easily operation, production efficiency height, effectively reduce the two cold one section interval drum tripe deflection of medium and thick slab, two cold one section structures of the high casting speed medium and thick slab caster of the requirement of adaptation high casting speed medium and thick slab continuous casting.

The technical scheme includes that the device comprises an outer arc frame and an inner arc frame which correspond to each other, sectional rollers are correspondingly arranged on the inner sides of the outer arc frame and the inner arc frame, an upper hydraulic cylinder is arranged on the upper section of the outer arc frame, a lower hydraulic cylinder is arranged on the lower section of the outer arc frame, the inner arc frame is provided with an upper hinged support corresponding to the upper hydraulic cylinder and a lower hinged support corresponding to the lower hydraulic cylinder, the front end of a piston rod of the upper hydraulic cylinder is hinged to the upper hinged support, and the front end of a piston rod of the lower hydraulic cylinder is hinged to the lower hinged support; the bottom panel of outer arc frame extends to inner arc frame bottom below, the inner arc frame side of panel is equipped with horizontal spacing track, going up articulated bearing be located in the horizontal spacing track.

The lower hydraulic cylinder is movably hinged on the outer arc frame.

The diameter of the sectional roller is phi 100 mm-phi 200mm, and the distance between adjacent rollers is 1.5 times of the diameter of the roller.

An upper pressure sensor and a lower pressure sensor for detecting the feedback pressure of the rod cavity are respectively arranged in the upper hydraulic cylinder and the lower hydraulic cylinder; the upper pressure sensor and the lower pressure sensor are connected with the input end of the PLC, and the output end of the PLC is connected with the controllers of the upper hydraulic cylinder and the lower hydraulic cylinder respectively.

And an upper displacement sensor and a lower displacement sensor which are used for detecting the moving distance of the piston are respectively arranged in the upper hydraulic cylinder and the lower hydraulic cylinder, and the upper displacement sensor and the lower displacement sensor are also connected with the input end of the PLC.

Has the advantages that:

1) the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are hinged with the upper hinged support and the lower hinged support, so that the roll gap is adjustable; the upper hinged support is limited to linearly move along the horizontal direction through the arrangement of a horizontal limiting track on the panel; the lower hinged support can perform small-range arc motion around the upper hinged support as a circle center under the driving of the lower hydraulic cylinder piston rod, and the adjustment of any back taper of the roll gap is ingeniously realized through the two different motion modes.

2) Through set up pressure sensor and displacement sensor in the pneumatic cylinder, the displacement that can the synchronous induction piston rod and the pneumatic cylinder have the pole chamber feedback pressure, there is pole chamber feedback pressure can reflect the effort of medium and thick slab to both sides segmentation roller, regard as the reference of adjusting the roll gap with this, through contrasting with the interior preset pressure value of PLC, and output control instruction corresponds the roll gap with automatic adjustment for the pneumatic cylinder that corresponds, the improper all sorts of problems that bring have been avoided artifical roll gap to adjust, it is very nimble convenient, when changing the pouring fracture surface, also need not change two cold one sections, the production efficiency is greatly improved.

3) The roll diameter of the sectional roll is phi 100 mm-phi 200mm, the distance between adjacent rolls is 1.5 times of the roll diameter, the sectional roll adopting the close arrangement of the thin roll diameter has the effect of reducing bulging, the matched roll gap is adjustable on line, and the bulging generated in a secondary cooling section due to the improvement of the drawing speed of the medium and thick plate blank continuous casting machine can be greatly reduced.

3) The utility model discloses simple structure, control is simple and convenient, and production efficiency is high, effectively reduce the two cold one section interval drum tripe deflection of medium-thickness slab, satisfies the requirement of high pulling speed medium-thickness slab continuous casting, guarantees product quality.

Drawings

FIG. 1 is a schematic structural diagram of a second cooling section of a conventional continuous casting machine.

FIG. 2 is a schematic diagram of a roll gap with a double cooling section and a first section forming an inverted cone roll gap along the moving direction of a casting blank.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a sectional view taken along line B-B of fig. 3.

Fig. 6 is a control schematic diagram of the present invention.

Wherein, 1-outer arc frame, 1.1-panel, 2-inner arc frame, 3-segment roller, 4-upper hydraulic cylinder, 5-lower hydraulic cylinder, 6-upper hinged support, 7-lower hinged support, 8-horizontal limit track.

Detailed Description

The invention will be further explained with reference to the drawings:

referring to fig. 3, an outer arc frame 1 and an inner arc frame 2 are arranged oppositely, a plurality of sectional rollers 3 (the roller diameter is phi 100 mm-phi 200mm, and the distance between adjacent rollers is 1.5 times of the roller diameter) are correspondingly arranged on the inner sides of the outer arc frame 1 and the inner arc frame 2, and a roller gap for a casting blank to pass through is formed between the sectional rollers 3 on the two sides;

an upper hydraulic cylinder 4 is fixed (or hinged) at the upper section of the outer arc frame 1, a lower hydraulic cylinder 5 is hinged at the lower section, an upper hinged support 6 corresponding to the upper hydraulic cylinder 4 and a lower hinged support 7 corresponding to the lower hydraulic cylinder 5 are arranged on the inner arc frame 2, the front end of a piston rod of the upper hydraulic cylinder 4 is hinged with the upper hinged support 6, and the front end of a piston rod of the lower hydraulic cylinder 5 is hinged with the lower hinged support 7; bottom panel 1.1 of outer arc frame 1 extends to 2 bottom below of inner arc frame, the inner arc frame side of panel 1.1 is equipped with horizontal spacing track 8, go up hinged support 6 and be located in horizontal spacing track 8, lower hinged support 7 with panel 1 contactless, does not receive panel 1 restriction during the motion.

Referring to fig. 6, an upper pressure sensor and a lower pressure sensor for detecting feedback pressure of the rod cavity and an upper displacement sensor and a lower displacement sensor for detecting a moving distance of the piston are respectively arranged in the upper hydraulic cylinder 4 and the lower hydraulic cylinder 5; the upper pressure sensor and the lower pressure sensor, the upper displacement sensor and the lower displacement sensor are connected with the input end of the PLC, and the output end of the PLC is connected with the controllers of the upper hydraulic cylinder 4 and the lower hydraulic cylinder 5 respectively.

The working principle is as follows:

the upper displacement sensor and the lower displacement sensor which are arranged in the upper hydraulic cylinder 4 and the lower hydraulic cylinder 5 are calibrated outside the line and can be used on the line after being respectively calibrated to be 0. The PLC respectively controls the upper hydraulic cylinder 4 and the lower hydraulic cylinder 5 to adjust the preset roll gap according to preset values; referring to fig. 3, in a high-pulling-speed state, a casting blank enters from a roll gap at the upper end, a roll gap at the lower end is led out, pressure sensors in an upper hydraulic cylinder 4 and a lower hydraulic cylinder 5 detect feedback pressure of a rod cavity in real time, the feedback pressure is compared with a preset value, if the feedback pressure is too high, the roll gap controlled correspondingly by the hydraulic cylinders is too small, a PLC outputs a control instruction to the corresponding hydraulic cylinders, and a piston rod is controlled to extend out to enlarge the roll gap; on the contrary, if the feedback pressure is too low, which indicates that the roll gap is too large, the PLC outputs a control instruction to the corresponding hydraulic cylinder to control the retraction of the piston rod so as to reduce the roll gap. The moving distance of the piston rod of the hydraulic cylinder is detected by a displacement sensor in the hydraulic cylinder and is transmitted to the PLC. The process can be adjusted in real time when the casting blank passes through, so that the roll gap is always kept at a proper size, and various problems caused by too large or too small back taper are avoided.

Specifically, when the upper hydraulic cylinder 4 adjusts the roll gap, the piston rod drives the upper hinged support 6 to make a linear motion along the horizontal limiting track 8, and when the lower hydraulic cylinder 5 adjusts the roll gap, the piston rod drives the lower hinged support 7 to make an arc motion around the upper hinged support 6 as a circle center.

Claims

1. A two-cooling one-stage structure of a high-pulling-speed medium-thickness slab continuous casting machine comprises an outer arc frame and an inner arc frame which correspond to each other, wherein sectional rollers are correspondingly arranged on the inner sides of the outer arc frame and the inner arc frame; the bottom panel of outer arc frame extends to inner arc frame bottom below, the inner arc frame side of panel is equipped with horizontal spacing track, go up hinged support is located in the horizontal spacing track.

2. The secondary cooling structure of a high haul speed medium slab caster as claimed in claim 1, wherein said upper and lower hydraulic cylinders are articulated to the outer arcuate frame.

3. The secondary cooling primary structure of a high-pulling-speed medium-thickness slab continuous casting machine according to claim 1 or 2, wherein the diameter of the sectional roller is 100mm to 200mm, and the distance between adjacent rollers is 1.5 times of the diameter of the roller.

4. The secondary cooling primary structure of a high-pulling-speed medium-thickness slab continuous casting machine according to claim 1 or 2, wherein an upper pressure sensor and a lower pressure sensor for detecting the feedback pressure of the rod cavity are respectively arranged in the upper hydraulic cylinder and the lower hydraulic cylinder; the upper pressure sensor and the lower pressure sensor are connected with the input end of the PLC, and the output end of the PLC is connected with the controllers of the upper hydraulic cylinder and the lower hydraulic cylinder respectively.

5. The secondary cooling primary structure of a high-pulling-speed medium-thickness slab caster as claimed in claim 4, wherein the upper and lower hydraulic cylinders are respectively provided therein with an upper displacement sensor and a lower displacement sensor for detecting a moving distance of the piston, and the upper and lower displacement sensors are connected to an input terminal of the PLC.