阅读说明：本技术 立式空心圆坯连铸机及出坯方法 (Vertical hollow round billet continuous casting machine and billet discharging method ) 是由 曹学欠 陈卫强 于 2019-12-04 设计创作，主要内容包括：本发明提供了一种立式空心圆坯连铸机及出坯方法,立式空心圆坯连铸机包括：结晶器；夹送辊,设置在结晶器的下游方向,夹送辊能够与空心圆坯引锭杆配合以夹持空心圆坯引锭杆移动；铸坯夹持升降装置,设置在夹送辊的下游方向,铸坯夹持升降装置能够夹持空心圆坯引锭杆沿竖直方向移动；引锭杆卷扬组件,设置在铸坯夹持升降装置的一侧,引锭杆卷扬组件具有存放位,引锭杆卷扬组件能够驱动空心圆坯引锭杆在存放位与铸坯夹持升降装置的下端之间移动。本发明的有益效果是,能够达到便于空心圆坯引锭杆送入和取回的目的。(The invention provides a vertical hollow round billet continuous casting machine and a billet ejection method, wherein the vertical hollow round billet continuous casting machine comprises: a crystallizer; the pinch roll is arranged at the downstream direction of the crystallizer and can be matched with the hollow round billet dummy bar to clamp the hollow round billet dummy bar to move; the casting blank clamping and lifting device is arranged in the downstream direction of the pinch roll and can clamp the hollow round blank dummy bar to move in the vertical direction; the dummy bar hoisting assembly is arranged on one side of the casting blank clamping and lifting device and is provided with a storage position, and the dummy bar hoisting assembly can drive the hollow round blank dummy bar to move between the storage position and the lower end of the casting blank clamping and lifting device. The invention has the beneficial effect that the purpose of bringing in and taking back the hollow round billet dummy bar conveniently can be achieved.)

1. The utility model provides a vertical hollow round billet conticaster which characterized in that includes:

a crystallizer (3);

the pinch roll (8) is arranged at the downstream direction of the crystallizer (3), and the pinch roll (8) can be matched with a hollow round billet dummy bar (15) to clamp the hollow round billet dummy bar (15) to move;

the casting blank clamping and lifting device (13) is arranged in the downstream direction of the pinch roll (8), and the casting blank clamping and lifting device (13) can clamp the hollow round blank dummy bar (15) to move in the vertical direction;

the dummy bar hoisting component (16) is arranged on one side of the casting blank clamping and lifting device (13), the dummy bar hoisting component (16) is provided with a storage position, and the dummy bar hoisting component (16) can drive the hollow round blank dummy bar (15) to move between the storage position and the lower end of the casting blank clamping and lifting device (13).

2. The vertical hollow round billet continuous casting machine according to claim 1, comprising an outer crystallizer and an inner crystallizer, wherein the outer crystallizer is provided with a containing cavity, the inner crystallizer is of a cylindrical structure, the inner crystallizer is sleeved in the outer crystallizer, the inner crystallizer can rotate relative to the outer crystallizer, and the upper end of the side wall of the inner crystallizer is provided with a lubricating oil hole for introducing rapeseed oil to play a role in heat transfer and lubrication.

3. The vertical hollow round billet continuous casting machine according to claim 2, wherein the outer diameter of the inner mold is gradually reduced in a direction in which the molten steel flows through the inner mold.

4. The vertical hollow round billet continuous casting machine according to claim 1, characterized by further comprising an intermediate tank (1) disposed at an upstream position of the mold (3), the intermediate tank (1) being connected with the mold (3) through a submerged entry nozzle (2).

5. The vertical hollow round billet continuous casting machine according to claim 4, characterized in that the submerged entry nozzle (2) is at least two, and at least two submerged entry nozzles (2) are symmetrically arranged at two opposite sides of the mold (3).

6. The vertical hollow round billet continuous casting machine according to claim 2, further comprising:

the outer pipe secondary cold spray cooling system (6) is arranged at the downstream position of the outer crystallizer, the outer pipe secondary cold spray cooling system (6) can cool the outer surface of the casting blank, and the pinch roll (8) is arranged in the downstream direction of the outer pipe secondary cold spray cooling system (6);

and the inner pipe cooling system (5) is arranged at the downstream position of the inner crystallizer, and the inner pipe cooling system (5) can cool the inner surface of the casting blank.

7. The vertical hollow round billet continuous casting machine according to claim 6, further comprising:

a vertical flame cutter (9) arranged downstream of the pinch roll (8), the vertical flame cutter (9) being capable of cutting the cast slab;

the water retaining and cutting slag collecting device (11) is arranged below the vertical flame cutting machine (9), and the water retaining and cutting slag collecting device (11) is obliquely arranged with the horizontal plane;

the cutting slag box (12) is arranged below the water retaining and cutting slag collecting device (11) and used for receiving cooling water and material slag, and a drain hole is formed in the bottom of the cutting slag box (12).

8. Vertical hollow round billet continuous casting machine according to claim 7, characterized in that it further comprises a steam and cutting fume collecting device (10) arranged downstream of the pinch rolls (8) and on the opposite side of the vertical flame cutter (9).

9. A billet discharging method of a vertical hollow round billet continuous casting machine, which adopts the vertical hollow round billet continuous casting machine of any one of claims 1 to 8 to carry out production operation, characterized by comprising the following steps:

step 10, conveying the hollow round billet dummy bar (15) to the lower end of the casting blank clamping and lifting device (13) from the storage position through the dummy bar hoisting assembly (16);

step 20, conveying the hollow round billet dummy bar (15) to the crystallizer (3) through the casting billet clamping and lifting device (13) and the pinch roll (8);

step 30, producing a casting blank at the crystallizer (3), and conveying the hollow round blank dummy bar (15) and the casting blank to a casting blank clamping and lifting device (13) through the pinch roll (8);

and 40, separating the hollow round billet dummy bar (15) from the casting blank, and conveying the hollow round billet dummy bar (15) to the storage position through a dummy bar hoisting assembly (16).

10. The method for discharging a vertical hollow round billet continuous casting machine according to claim 9, characterized by further comprising the step 50 of: separating a dummy bar body of the hollow round billet dummy bar (15) from a dummy bar head, cleaning the dummy bar head outside a production line and installing the processed dummy bar head to the dummy bar body.

Technical Field

The invention relates to the technical field of continuous casting in steel production, in particular to a vertical hollow round billet continuous casting machine and a billet ejection method.

Background

With the development of the iron and steel industry, iron and steel enterprises pay more and more attention to energy conservation and consumption reduction, and the near-net-shape continuous casting technology can save energy and reduce the investment and production cost of the subsequent process, wherein the hollow round billet continuous casting technology is one of the technologies. At present, seamless steel tube manufacturers mainly adopt a method of solid round billet → perforation → oblique rolling pierced billet → continuous rolling tube → reduction and sizing to produce seamless steel tubes, if the blanks are made into hollow round billets, the perforation procedure can be omitted, the investment of tube-penetrating equipment and the production cost are reduced, and the method has great economic benefits for iron and steel enterprises.

At present, a plurality of enterprises for producing hollow round billets and steel pipes by direct continuous casting technology are researched, but no report of industrial production is provided. Because the hollow round billet is special in shape and is produced in a vertical mode, the dummy bar needs to be fed in and taken out by a reasonable process flow, the dummy bar can be conveniently fed in and taken out, the storage is simple, and the replacement and maintenance of the dummy bar head can be facilitated.

Disclosure of Invention

The invention provides a vertical hollow round billet continuous casting machine and a billet ejection method, which aim to achieve the aim of bringing in and taking out a dummy bar conveniently.

The technical scheme adopted by the invention for solving the technical problems is as follows: a vertical hollow round billet continuous casting machine comprises: a crystallizer; the pinch roll is arranged at the downstream direction of the crystallizer and can be matched with the hollow round billet dummy bar to clamp the hollow round billet dummy bar to move; the casting blank clamping and lifting device is arranged in the downstream direction of the pinch roll and can clamp the hollow round blank dummy bar to move in the vertical direction; the dummy bar hoisting assembly is arranged on one side of the casting blank clamping and lifting device and is provided with a storage position, and the dummy bar hoisting assembly can drive the hollow round blank dummy bar to move between the storage position and the lower end of the casting blank clamping and lifting device.

Further, vertical hollow round billet conticaster includes outer crystallizer and interior crystallizer, and outer crystallizer has and holds the cavity, and interior crystallizer is cylindric structure, and interior crystallizer cover is established in outer crystallizer, and interior crystallizer can rotate for outer crystallizer, and the lateral wall upper end of interior crystallizer is provided with and is used for letting in rapeseed oil in order to play heat transfer and lubricated lubricating effect's lubricated oil hole.

Further, the outer diameter of the inner mold is gradually reduced in a direction in which the molten steel flows through the inner mold.

Furthermore, the vertical hollow round billet continuous casting machine also comprises a tundish, the tundish is arranged at the upstream position of the crystallizer, and the tundish is connected with the crystallizer through a submerged nozzle.

Furthermore, the number of the submerged nozzles is at least two, and the submerged nozzles are symmetrically arranged on two opposite sides of the crystallizer.

Further, the vertical hollow round billet continuous casting machine further comprises: the outer pipe secondary cold spray cooling system is arranged at the downstream position of the outer crystallizer, the outer pipe secondary cold spray cooling system can cool the outer surface of the casting blank, and the pinch roll is arranged in the downstream direction of the outer pipe secondary cold spray cooling system; and the inner pipe cooling system is arranged at the downstream position of the inner crystallizer and can cool the inner surface of the casting blank.

Further, the vertical hollow round billet continuous casting machine further comprises: the vertical flame cutting machine is arranged in the downstream direction of the pinch roll and can cut a casting blank; the water retaining and cutting slag collecting device is arranged below the vertical flame cutting machine, and is obliquely arranged with the horizontal plane; and the cutting slag box is arranged below the water retaining and cutting slag collecting device and is used for receiving cooling water and slag, and a drain hole is formed in the bottom of the cutting slag box.

Further, the vertical hollow round billet continuous casting machine also comprises a steam and cutting flue gas collecting device which is arranged at the downstream direction of the pinch roll and is positioned at the opposite side of the vertical flame cutting machine.

The invention also provides a blank discharging method of the vertical hollow round blank continuous casting machine, which adopts the vertical hollow round blank continuous casting machine to carry out production operation and comprises the following steps: step 10, conveying a hollow round billet dummy bar to the lower end of a casting blank clamping and lifting device from a storage position through a dummy bar hoisting assembly; step 20, conveying the hollow round billet dummy bar to a crystallizer through a casting blank clamping lifting device and a pinch roll; step 30, producing a casting blank at a crystallizer, and conveying a hollow round blank dummy bar and the casting blank to a casting blank clamping and lifting device through a pinch roll; and step 40, separating the hollow round billet dummy bar from the casting blank, and conveying the hollow round billet dummy bar to a storage position through a dummy bar hoisting assembly.

Further, the blank discharging method of the vertical hollow round blank continuous casting machine further comprises the following steps of 50: separating the dummy bar body of the hollow round billet dummy bar from the dummy bar head, cleaning the dummy bar head outside a production line and installing the processed dummy bar head to the dummy bar body.

The invention has the beneficial effects that when the production operation starts, the hollow round blank dummy bar can be conveyed to the lower end of the casting blank clamping and lifting device from the storage position through the dummy bar hoisting component, then the hollow round blank dummy bar is conveyed to the crystallizer through the casting blank clamping and lifting device and the pinch roll in sequence, when the hollow round blank dummy bar is separated from the casting blank, the separated hollow round blank dummy bar can be conveyed back to the storage position through the dummy bar hoisting component, and the purpose of bringing convenience to the feeding and the retrieving of the hollow round blank dummy bar is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a dummy bar of an embodiment of the present invention in a storage position;

FIG. 2 is a schematic view showing a dummy bar being carried according to an embodiment of the present invention;

FIG. 3 is a schematic view of the dummy bar of the embodiment of the present invention at the lowest position

FIG. 4 is a schematic view of a dummy bar of an embodiment of the present invention being carried to a mold by a pinch roll;

FIG. 5 is a schematic view of a dummy bar of an embodiment of the present invention at a casting position;

FIG. 6 is a schematic view of a dummy bar at a cutting position of a billet head according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of normal production of an embodiment of the present invention.

Reference numbers in the figures: 1. an intermediate tank; 2. an immersion nozzle; 3. a crystallizer; 4. a crystallizer vibration device; 5. an inner tube cooling system; 6. an outer pipe secondary cooling spray cooling system; 8. a pinch roll; 9. a vertical flame cutter; 10. a steam and cutting fume collection device; 11. a water retaining and cutting slag collecting device; 12. cutting a slag box; 13. a casting blank clamping and lifting device; 14. drawing the billets to an inclined way; 15. a hollow round billet dummy bar; 16. and a dummy bar hoisting component.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 7, an embodiment of the present invention provides a vertical hollow round billet continuous casting machine, including a mold 3, pinch rolls 8, a billet clamping lifting device 13, and a billet clamping lifting device 13. The pinch roll 8 is arranged in the downstream direction of the crystallizer 3, and the pinch roll 8 can be matched with a hollow round billet dummy bar 15 (dummy bar) to clamp the hollow round billet dummy bar 15 to move. The casting blank clamping and lifting device 13 is arranged at the downstream direction of the pinch roll 8, and the casting blank clamping and lifting device 13 can clamp the hollow round blank dummy bar 15 to move along the vertical direction. The dummy bar hoisting component 16 is arranged on one side of the casting blank clamping and lifting device 13, the dummy bar hoisting component 16 is provided with a storage position, and the dummy bar hoisting component 16 can drive the hollow round blank dummy bar 15 to move between the storage position and the lower end of the casting blank clamping and lifting device 13.

When the production operation starts, the hollow round blank dummy bar 15 can be conveyed to the lower end of the casting blank clamping and lifting device 13 from the storage position through the dummy bar hoisting component 16, then the hollow round blank dummy bar 15 is conveyed to the crystallizer 3 through the casting blank clamping and lifting device 13 and the pinch roll 8 in sequence, when the hollow round blank dummy bar 15 is separated from the casting blank, the separated hollow round blank dummy bar 15 can be conveyed back to the storage position through the dummy bar hoisting component 16, and the purpose of bringing convenience to the feeding and retrieving of the hollow round blank dummy bar 15 is achieved.

The vertical hollow round billet continuous casting machine comprises an outer crystallizer and an inner crystallizer, wherein the outer crystallizer is provided with an accommodating cavity, the inner crystallizer is of a cylindrical structure, the inner crystallizer is sleeved in the outer crystallizer, the inner crystallizer can rotate relative to the outer crystallizer, and a lubricating oil hole for introducing rapeseed oil to play a role in heat transfer and lubrication is formed in the upper end of the side wall of the inner crystallizer.

Rapeseed oil is injected through a lubricating oil hole in the inner crystallizer, the rapeseed oil can be carbonized under the action of a hot blank, an air gap between a blank shell and the inner crystallizer is filled, the heat transfer and lubricating effects are achieved, meanwhile, the inner crystallizer has a rotating function, and the inner crystallizer is combined with a carbon layer formed by the rapeseed oil to be beneficial to demolding and cooling, so that the inner crystallizer can be effectively prevented from being locked by a hollow casting blank.

The outer diameter of the inner mold is gradually reduced in the direction in which the molten steel flows through the inner mold. Specifically, the length of the inner crystallizer is 700 mm-900 mm, and the taper of the inner crystallizer is 0.5%/m-0.8%/m. The inner crystallizer is arranged to be of an inverted cone structure, so that a casting blank can be conveniently demoulded, and the inner crystallizer is not easily locked by the casting blank.

It should be noted that, the vertical hollow round billet continuous casting machine further comprises a tundish 1 arranged at the upstream position of the crystallizer 3, and the tundish 1 is connected with the crystallizer 3 through a submerged nozzle 2. Preferably, the submerged entry nozzles 2 are at least two, and the at least two submerged entry nozzles 2 are symmetrically arranged on two opposite sides of the mold 3.

Molten steel flows into the tundish 1 through the ladle and then enters the crystallizer 3 through the submerged nozzle 2, the submerged nozzle 2 is provided with two submerged nozzles which are respectively distributed on the left side and the right side of the crystallizer 3, the holes formed in the submerged nozzle 2 are holes formed in one side, the molten steel forms anticlockwise circulation after coming out of the two submerged nozzles 2, slag inclusion and bubbles in the molten steel can float upwards through circulation motion, the temperature of the molten steel is uniform, the slag inclusion, air holes and microcracks on the surface of a continuous casting billet are reduced, the quality of the continuous casting billet is improved, the electromagnetic stirring effect similar to that of the crystallizer is achieved, and electricity is not needed.

The vertical hollow round billet continuous casting machine further comprises a crystallizer vibration device 4 which is arranged outside the crystallizer 3 and can vibrate the crystallizer 3. The crystallizer vibration device 4 can make the crystallizer 3 do the arc-like motion along the radius of the continuous casting machine according to the given amplitude, frequency and waveform deflection characteristics, so that the demolding is easier.

Further, the vertical hollow round billet continuous casting machine also comprises an outer pipe secondary cooling spray cooling system 6 and an inner pipe cooling system 5. The outer pipe secondary cold spray cooling system 6 is arranged at the downstream position of the outer crystallizer 3, the outer pipe secondary cold spray cooling system 6 can cool the outer surface of a casting blank, and the pinch roll 8 is arranged in the downstream direction of the outer pipe secondary cold spray cooling system 6. An inner pipe cooling system 5 is provided at a downstream position of the inner mold 3, and the inner pipe cooling system 5 can cool the inner surface of the cast slab.

An outer pipe secondary cooling spray cooling system 6 is arranged at the casting blank position of the outer pipe after the solidified casting blank exits the outer crystallizer, the cooling configuration of the outer pipe secondary cooling spray cooling system 6 is consistent with that of the conventional round blank, and aerial fog cooling is adopted. An inner pipe cooling system 5 is arranged at the casting blank position of the inner pipe after the solidified casting blank is discharged from the inner crystallizer to cool the inner pipe of the casting blank, so that the casting blank is prevented from being overheated to cause steel leakage. The cooling medium of the inner pipe cooling system 5 is cooled by high-temperature steam without water, so that the molten steel is prevented from contacting with water and exploding after steel leakage.

Preferably, the vertical hollow round billet continuous casting machine further comprises a vertical flame cutting machine 9, a water blocking and cutting slag collecting device 11 and a cutting slag bin 12. The vertical flame cutter 9 is provided in the downstream direction of the pinch roll 8, and the vertical flame cutter 9 can cut a cast slab. After the cast slab reaches the set length, the cast slab is cut by the vertical flame cutter 9 to be divided into cast slab segments of the set length. The water retaining and cutting slag collecting device 11 is arranged below the vertical fire cutting machine 9, and the water retaining and cutting slag collecting device 11 is obliquely arranged with the horizontal plane. The cutting slag box 12 is arranged below the water retaining and cutting slag collecting device 11 and used for receiving cooling water and material slag, and a drain hole is formed in the bottom of the cutting slag box 12.

A water retaining and cutting slag collecting device 11 is arranged below a cutting gun of the vertical fire cutting machine 9, cutting slag and secondary cold water enter a cutting slag box 12 through the water retaining and cutting slag collecting device 11, a drain hole is formed in the bottom of the cutting slag box 12, and the drain water is collected and discharged through a submersible pump.

The vertical hollow round billet continuous casting machine also comprises a steam and cutting flue gas collecting device 10 which is arranged at the downstream direction of the pinch roll 8 and is positioned at the opposite side of the vertical flame cutting machine 9. The steam and cutting smoke collecting device 10 is used for collecting steam sprayed by the inner pipe cooling system 5 and smoke generated by cutting a casting blank by the vertical flame cutting machine 9.

The embodiment of the invention also comprises a blank discharging cable-stayed trolley 14 which is arranged at one side of the casting blank clamping and lifting device 13 and is positioned below the dummy bar hoisting component 16. After the vertical flame cutting machine 9 cuts off the casting blank, the casting blank is conveyed downwards to the ejection inclined-pulling trolley 14, the ejection inclined-pulling trolley 14 conveys the casting blank to the horizontal position, and the casting blank is taken off the line through a conveying roller way or an overhead traveling crane, so that the production of the casting blank is realized.

It should be noted that the dummy bar hoisting assembly 16 is disposed above the ejection cable-stayed trolley 14, the two are not interfered with each other, and most of the track of the ejection cable-stayed trolley 14 and the track of the dummy bar hoisting assembly 16 are parallel to each other, so that the purpose that the dummy bar hoisting assembly 16 does not interfere with the ejection system and shares the space as much as possible is achieved.

The invention also provides a blank discharging method of the vertical hollow round blank continuous casting machine, which adopts the vertical hollow round blank continuous casting machine to carry out production operation and comprises the following steps:

step 10, conveying a hollow round blank dummy bar 15 to the lower end of a casting blank clamping and lifting device 13 from a storage position through a dummy bar hoisting assembly 16;

step 20, conveying the hollow round billet dummy bar 15 to the crystallizer 3 through a casting blank clamping lifting device 13 and a pinch roll 8;

step 30, producing a casting blank at the crystallizer 3, and conveying the hollow round blank dummy bar 15 and the casting blank to a casting blank clamping and lifting device 13 through a pinch roll 8;

and step 40, separating the hollow round billet dummy bar 15 from the casting blank, and conveying the hollow round billet dummy bar 15 to a storage position through the dummy bar hoisting assembly 16.

And step 50, separating the dummy bar body of the hollow round billet dummy bar 15 from the dummy bar head, cleaning the dummy bar head outside a production line, and mounting the processed dummy bar head on the dummy bar body.

The specific steps will be described in detail with reference to fig. 1 to 7:

as shown in fig. 1, the hollow round billet dummy bar 15 is at the storage position, and the billet holding lifter 13 is at the lowest position. The production of the vertical hollow round billet continuous casting machine starts from the delivery of dummy ingots, and the hollow round billet dummy ingot rod 15 is delivered downwards to the bottom of a foundation pit of the continuous casting machine from a storage position by the dummy ingot rod hoisting assembly 16.

In the position shown in fig. 2, the dummy bar car of the dummy bar hoist assembly 16 slides down the rail to the lowest position, and the guide of the guide wheel and the guide rail ensures that the hollow round billet dummy bar 15 is kept vertical at the lowest position.

In the position shown in fig. 3, after the hollow round billet dummy bar 15 enters the lowest position, the hollow round billet dummy bar 15 is clamped by the clamping device of the casting blank clamping and lifting device 13, and the dummy bar trolley of the dummy bar hoisting assembly 16 loosens the hollow round billet dummy bar 15.

As shown in fig. 4, the casting blank holding lifting device 13 holds the hollow round blank dummy bar 15 to move upwards, when the bar body of the hollow round blank dummy bar 15 enters the penultimate pinch roll 8, the casting blank holding lifting device 13 stops operating, the penultimate pinch roll 8 and the penultimate pinch roll 8 are pressed down to hold the hollow round blank dummy bar 15, and then the holding device of the casting blank holding lifting device 13 releases the hollow round blank dummy bar 15. And starting the pinch rolls 8, sending the hollow round billet dummy bar 15 upwards, and pressing down the third pinch roll after the head of the hollow round billet dummy bar 15 passes through the third pinch roll, and so on. When the last pinch roll is lifted and loosened with the distance of 500mm from the tail of the hollow round billet dummy bar 15, the other pinch rolls are also moved with the distance of 500mm from the tail of the hollow round billet dummy bar 15, when the dummy bar head enters the bottom of the crystallizer 3 with the distance of 100mm, the pinch rolls 8 stop running, and at the moment, the hollow round billet dummy bar 15 enters the casting position, as shown in figure 5.

And after the dummy ingot is sealed by workers, preparing for casting. Molten steel flows into the tundish 1 from the ladle and then enters the crystallizer 3 through the submerged nozzle 2, and the molten steel forms a hollow casting blank under the cooling of the inner crystallizer and the outer crystallizer. When the liquid level of the crystallizer 3 reaches a certain height, the pinch roll 8 is started, the pinch roll clamps the hollow round billet dummy bar 15 to move downwards, and the hollow round billet dummy bar 15 draws the casting blank to move downwards together. After the solidified casting blank is discharged from the outer crystallizer, the outer pipe casting blank is provided with an outer pipe secondary cooling spray cooling system 6, and after the solidified casting blank is discharged from the inner crystallizer, the inner pipe casting blank is provided with an inner pipe cooling system 5 to cool the inner pipe of the casting blank, so that the situation that the casting blank is overheated due to the return temperature is avoided, and steel leakage is caused.

When the hollow round billet dummy bar 15 moves into the casting blank clamping and lifting device 13, the casting blank clamping and lifting device 13 clamps the hollow round billet dummy bar 15. The casting blank clamping and lifting device 13 follows the casting blank. After the head of the hollow round billet dummy bar 15 passes through the vertical flame cutter 9, the vertical flame cutter 9 is started to cut off the head of the casting blank, as shown in fig. 6.

After the vertical flame cutting machine 9 cuts off, the casting blank clamping and lifting device 13 is started to rapidly move downwards, and the hollow round blank dummy bar 15 and the blank head are conveyed to the lowest position. The dummy bar trolley of the dummy bar hoisting component 16 clamps the hollow round billet dummy bar 15, and the casting blank clamping and lifting device 13 loosens the hollow round billet dummy bar 15. The dummy bar hoist assembly 16 is started and moved upward to transport the hollow round billet dummy bar 15 and the billet head together to a dummy bar storage position as shown in fig. 7.

The head of the hollow round billet dummy bar 15 is separated from the bar body of the hollow round billet dummy bar 15 by a workshop crane or a special electric hoist above the hollow round billet dummy bar 15, the head of the hollow round billet dummy bar 15 and the bar head are lifted and transported away, and the head of the hollow round billet dummy bar 15 is installed back to the bar body of the hollow round billet dummy bar 15 after the on-line external treatment. The process does not interfere with production, and does not occupy production preparation time.

The casting blank clamping and lifting device 13 clamps the casting blank before the vertical flame cutting machine 9 cuts the casting blank, the casting blank is moved downwards after the vertical flame cutting machine 9 cuts the casting blank and is transported to the ejection diagonal trolley 14, the casting blank clamping and lifting device 13 loosens the casting blank, the ejection diagonal trolley 14 clamps the casting blank, the casting blank is transported to the horizontal position by the ejection diagonal trolley 14, and after the horizontal position is reached, the clamping is loosened and the casting blank is taken off the line through a transportation roller way or a crown block, so that the production of the hollow round blank is realized.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: when the production operation starts, the hollow round blank dummy bar can be conveyed to the lower end of the casting blank clamping and lifting device from the storage position through the dummy bar hoisting assembly, then the hollow round blank dummy bar is conveyed to the crystallizer through the casting blank clamping and lifting device and the pinch roll in sequence, and when the hollow round blank dummy bar is separated from the casting blank, the separated hollow round blank dummy bar can be conveyed back to the storage position through the dummy bar hoisting assembly, so that the purpose of bringing convenience to the feeding and the retrieving of the hollow round blank dummy bar is achieved.

The production of hollow round billets is realized, the locking of the casting blank to the inner crystallizer copper pipe can be effectively avoided, and meanwhile, the rotation of the casting blank in the crystallizer is realized through the single-side hole opening of the double water ports, so that the quality of the casting blank is improved, and energy is saved.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.