A casting device

Abstract

The application relates to a casting device, and belongs to the technical field of the casting device, which comprises an ingot rod and a guide roller table, the ingot rod comprises an ingot head and a rod body connected with the ingot head, the cross section of the ingot head connected with one end of the rod body gradually decreases along a slab moving direction, and transition inclined surfaces are arranged on horizontal two sides; the guide roller table comprises: a lower roller frame, which is provided with a mounting seat at a bottom end and is arranged along an extension direction of a continuous casting production line; an upper roller frame, which is arranged on a side of the lower roller frame away from the mounting seat and is provided with a guide column between the lower roller frame; a telescopic cylinder, which is connected between the lower roller frame and the upper roller frame; and a cooling assembly, which comprises a telescopic pipe slidingly connected to the upper roller frame and a nozzle connected to the telescopic pipe. The application has the effect of increasing the application range of the casting device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of casting device, in particular to a casting device. BACKGROUND

[0002] Slab continuous casting is a continuous steel casting iron technology with slab as the main product. The slab with a width-thickness ratio greater than three is called slab, and the continuous casting slab is mainly used for rolling flat plate (thick plate, medium plate, thin plate, strip coil). The casting device of the slab continuous casting production line usually includes a rotary tower, a ladle arranged on the rotary tower, an intermediate ladle for receiving molten steel in the ladle, a crystallizer arranged below the intermediate ladle, a guide roller for guiding the slab, a cooling nozzle arranged on the guide roller, an electromagnetic induction stirrer arranged on the guide roller, a dummy bar for pulling the slab, a tension leveler, and a flame cutter for cutting the slab. The cooling nozzle sprays water on the surface of the slab to form a solid shell on the surface of the slab. The guide roller extrudes the slab from both sides to prevent the slab from bulging.

[0003] For the related technology in the above, the inventor finds that the position of the cooling nozzle is fixedly installed. When different crystallizers are used to produce different specifications of slabs, the width of the water sprayed by the cooling nozzle is difficult to ensure uniform cooling of multiple specifications of slabs, and the application range of the casting device is limited. SUMMARY

[0004] In order to increase the application range of the casting device, the present application provides a casting device.

[0005] The casting device provided by the present application adopts the following technical scheme:

[0006] A casting device includes a dummy bar and a guide roller. The dummy bar includes a dummy head and a shaft connected to the dummy head. The cross section of the end of the dummy head connected to the shaft gradually decreases along the moving direction of the slab, and the horizontal two sides are provided with a transition slope. The guide roller includes:

[0007] A lower roller frame is provided with a mounting seat at the bottom end, and the mounting seat is arranged along the extension direction of the continuous casting production line;

[0008] An upper roller frame is arranged on the side of the lower roller frame away from the mounting seat, and a guide column is arranged between the upper roller frame and the lower roller frame;

[0009] A telescopic cylinder is connected between the lower roller frame and the upper roller frame;

[0010] A cooling assembly includes a telescopic pipe slidingly connected to the upper roller frame and a nozzle connected to the telescopic pipe;

[0011] The adjusting assembly comprises a trigger rack slidingly connected to the upper roller frame, a trigger gear shaft rotatably connected to the upper roller frame, an adjusting gear coaxially connected to the trigger gear shaft, and an adjusting rack slidingly connected to the upper roller frame, the trigger rack engages with the trigger gear shaft, and the adjusting gear engages with the adjusting rack; the adjusting rack is connected to the telescopic pipe for pulling the telescopic pipe to extend or retract;

[0012] The adjusting assembly is provided with a group on each side of the upper roller frame, and when the dummy head passes through the trigger rack, the transition slope pushes the trigger rack away from the upper roller frame.

[0013] By adopting the above technical scheme, when the dummy bar passes through the adjusting assembly, the transition slope of the dummy head pushes the trigger rack, the movement of the trigger rack makes the trigger gear shaft rotate, the adjusting gear synchronously rotates, the movement of the adjusting rack lengthens the telescopic pipe, and the distance between the corresponding nozzles is also increased, thereby the water spraying range of the nozzles is widened, and the self-adaptive adjustment can be made for different width slabs, and the application range of the casting device is increased.

[0014] Optionally, the telescopic pipe comprises a plurality of unit pipes, the adjacent unit pipes are slidingly connected, and the diameters of the unit pipes gradually decrease from the middle to the two sides of the telescopic pipe.

[0015] By adopting the above technical scheme, the unit pipes on the two sides can be retracted to the middle or lengthened to the two sides, and the nozzles can be kept centered with slabs of different widths.

[0016] Optionally, the adjusting rack comprises two engaging parts and a shear multi-link hinged between the two engaging parts, the engaging parts are slidingly connected to the upper roller frame, and the shear multi-link engages with the unit pipes.

[0017] By adopting the above technical scheme, when the shear multi-link retracts or lengthens, each hinged point moves uniformly, so that each unit pipe of the telescopic pipe can uniformly retract or lengthen, thereby uniformly driving each nozzle to move, making the water spraying range of the nozzles more uniform, improving the cooling effect, and making the thickness of the slab surface cooling and solidification more uniform.

[0018] Optionally, a water inlet is arranged on the unit pipe in the middle of the telescopic pipe.

[0019] By adopting the above technical scheme, the position of the unit pipe in the middle of the telescopic pipe is relatively fixed, and the water inlet can make the water supply from the water source to the telescopic pipe more stable, and can also balance the water pressure in the unit pipes on the two sides, improving the uniformity of the water spraying range.

[0020] Optionally, the adjusting assembly further comprises a synchronous gear coaxially connected to the adjusting gear and a synchronous rack slidingly connected to the upper roller frame, and the cooling assembly, the adjusting gear, the adjusting rack, and the synchronous gear are provided with a plurality of synchronous gears, and each synchronous gear on the same side of the upper roller frame engages with the synchronous rack.

[0021] By adopting the technical scheme, the rotation of the trigger gear shaft can drive the coaxial synchronous gear to rotate, the synchronous gear rotation drives the synchronous rack to move, the synchronous rack can drive the remaining synchronous gears to rotate synchronously, and then the adjustment gears rotate synchronously, and the synchronous rack synchronously drives the telescopic pipes to expand and contract, so that the nozzles corresponding to the telescopic pipes can uniformly spray the water width.

[0022] Optionally, the lower roller frame also has a cooling assembly, an adjustment gear, an adjustment rack, a synchronous gear and a synchronous rack symmetrically relative to the slab, the adjustment gear and the synchronous gear on the lower roller frame are rotationally connected with the slide sleeve coaxial with the trigger gear shaft, and the slide sleeve is in sliding spline connection with the trigger gear shaft.

[0023] By adopting the technical scheme, when the thickness of the slab changes, the telescopic cylinder adjusts the distance between the upper roller frame and the lower roller frame, the slide sleeve slides on the trigger gear shaft, and the adjustment gears on the upper roller frame and the lower roller frame can rotate synchronously, and then the water width of the nozzles is consistent.

[0024] Optionally, the cooling assembly further comprises lateral nozzles arranged on the upper roller frame and the lower roller frame respectively.

[0025] By adopting the technical scheme, the lateral nozzles can spray water to cool the slab laterally, and when the distance between the upper roller frame and the lower roller frame changes, the lateral nozzles also move to expand or narrow the water width.

[0026] Optionally, the upper roller frame is provided with a guide cylinder for sliding connection of the trigger rack, and a tension spring is arranged between the guide cylinder and the end of the trigger rack away from the slab.

[0027] By adopting the technical scheme, the tension spring can keep the trigger rack in contact with the dummy bar or the slab, and stabilize the length of each telescopic pipe.

[0028] Optionally, the end of the trigger rack towards the slab is provided with a roller.

[0029] By adopting the technical scheme, the roller can reduce the friction between the trigger rack and the dummy head or the slab, and can also press the side of the slab to reduce the bulging deformation of the side of the slab.

[0030] Optionally, the outer side of the mounting seat is provided with a water collecting plate.

[0031] By adopting the technical scheme, the water collecting plate can collect the excess water sprayed by the nozzles, facilitate recycling of the water, and make the production more environmentally friendly.

[0032] In summary, the present application has at least one of the following beneficial technical effects:

[0033] 1. When the dummy bar passes through the adjusting assembly, the transition slope of the dummy head will trigger the rack to push, the movement of the trigger rack makes the trigger gear shaft rotate, the adjusting gear rotates synchronously, the movement of the adjusting rack lengthens the telescopic pipe, and the distance between the corresponding nozzles also increases, thereby enabling the nozzle to spray water over a wider area, and enabling self-adaptive adjustment for different width slabs, thereby increasing the application range of the casting device;

[0034] 2. When the scissors type multi-link telescopes, each hinge point moves uniformly, enabling each unit pipe of the telescopic pipe to telescope uniformly, thereby uniformly moving each nozzle, enabling the water sprayed by the nozzle to be more uniform, improving the cooling effect, and enabling the thickness of the slab surface to cool and solidify more uniformly;

[0035] 3. The rotation of the trigger gear shaft can drive the coaxial synchronous gear to rotate, the rotation of the synchronous gear drives the synchronous rack to move, and the synchronous rack can drive the remaining synchronous gears to rotate synchronously, thereby enabling each adjusting gear to rotate synchronously, and the synchronous rack to synchronously drive the telescopic pipe to telescope, enabling the corresponding nozzles of each telescopic pipe to uniformly spray water over a wide area;

[0036] 4. When the thickness of the slab changes, the telescopic cylinder adjusts the distance between the upper roller frame and the lower roller frame, the sliding sleeve slides on the trigger gear shaft, enabling the adjusting gears on the upper roller frame and the lower roller frame to rotate synchronously, thereby enabling the water spray width of the nozzles to be consistent;

[0037] 5. The roller can reduce the friction between the trigger rack and the dummy head or the slab, and can also serve to extrude the side of the slab, thereby reducing the bulging deformation of the side of the slab. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0039] Figure 2 is a schematic diagram of the overall structure of the embodiment of the present application; Figure 1

[0040] Figure 3 is a schematic diagram of the connection structure of the adjusting rack and the telescopic pipe of the embodiment of the present application;

[0041] Figure 4 is a schematic diagram of the structure of the lateral nozzle of the embodiment of the present application;

[0042] ​In the figure, 100, slab; 1, dummy bar; 11, dummy head; 12, shaft; 111, transition slope; 2, lower roller stand; 21, mounting seat; 22, water collecting plate; 3, upper roller stand; 31, guide column; 32, guide cylinder; 33, tension spring; 4, telescopic cylinder; 5, cooling assembly; 51, telescopic pipe; 511, unit pipe; 512, water inlet; 52, nozzle; 53, lateral nozzle; 6, adjusting assembly; 61, trigger rack; 611, roller; 62, trigger gear shaft; 63, adjusting gear; 64, adjusting rack; 641, meshing part; 642, scissor multi-link; 65, synchronous gear; 66, synchronous rack; 67, sliding sleeve. DETAILED DESCRIPTION

[0043] The following description will be made in conjunction with the accompanying drawings. Figure 1 - the accompanying drawings Figure 4 The present application will be further described in detail.

[0044] The present application proposes a casting device, which comprises a ladle, a rotary tower, an intermediate tank, a crystallizer, a dummy bar 1, a guide roller, an electromagnetic induction stirrer and a flame cutter. The top end of the rotary tower is rotatable; the ladle is provided with two, which are respectively installed at the two ends of the rotatable part of the upper part of the rotary tower, for alternately receiving molten steel and pouring molten steel; the intermediate tank is used to hold the molten steel poured by the ladle and to split the molten steel into the crystallizer; the crystallizer preliminarily crystallizes and shapes the molten steel according to a predetermined shape, so that an outer shell is generated on the outer surface of the billet; the molten steel enters the dummy bar 1 and solidifies to be connected with the dummy bar 1, the dummy bar 1 pulls out the billet from the crystallizer and sends it into the guide roller; the guide roller guides and conveys the billet and plays a role of extruding and limiting the surface of the billet, so that the billet reduces the condition of bulging, and the guide roller is also provided with a cooling assembly 5 for secondary cooling of the slab 100; the electromagnetic induction stirrer is used to stir the molten steel in the slab 100, so as to improve the uniformity of the molten steel; the flame cutter is used to cut the solidified slab 100 into shorter slabs for convenient transportation and use.

[0045] Reference Figure 1 and Figure 2 The dummy bar 1 comprises a dummy head 11 and a shaft 12. The dummy head 11 is provided with a cavity at one end, the molten steel flows into the cavity and solidifies to be fixedly connected with the dummy head 11, and the dummy bar 1 is connected at the end away from the slab 100 and connected with a traction device, for pulling out the slab 100 from the crystallizer and moving along the guide roller. In the embodiment of the present application, the shaft 12 is flexible, which is more suitable for continuous casting process of the slab 100. The end of the dummy head 11 away from the slab 100 is in isosceles trapezoidal cross section, and two transition slopes 111 are symmetrically arranged about the slab 100.

[0046] The guide roller table comprises a lower roller frame 2, an upper roller frame 3, a telescopic cylinder 4, a cooling assembly 5 and an adjusting assembly 6. The lower roller frame 2 is a rectangular frame, and five guide rollers are rotationally connected to the top end of the lower roller frame 2, and the central axes of the guide rollers are perpendicular to the moving direction of the slab 100. The bottom end of the lower roller frame 2 is connected with a mounting seat 21, and the mounting seat 21 is a cuboid and is mounted on the working site. The upper roller frame 3 and the lower roller frame 2 are combined and are provided in multiple groups along the running direction of the continuous casting production line, thereby forming the whole guide roller table. The mounting seat 21 is welded with a water collecting plate 22, and the sprayed water will fall on the water collecting plate 22, thereby facilitating the recycling of the water by the staff. The upper roller frame 3 is arranged above the lower roller frame 2 and is provided with guide rollers which are opposite to the guide rollers on the lower roller frame 2. A guide column 31 is arranged between the upper roller frame 3 and the lower roller frame 2, and the guide column 31 is formed by slidingly inserting two hollow rectangular tubes. Four mounting tables are welded at the four corners of the mounting seat 21, and the rectangular tube with a larger diameter is welded with the mounting table, and the rectangular tube with a smaller diameter is welded with the upper roller frame 3. The guide column 31 is provided with one mounting table at each of the four mounting tables, so that the upper roller frame 3 can move towards or away from the lower roller frame 2.

[0047] The telescopic cylinder 4 is arranged in the guide column 31 and is hingedly connected with the upper roller frame 3 and the lower roller frame 2 at both ends, and the hinging axes are perpendicular to the moving direction of the slab 100. The thickness of the slab 100 can be adjusted by the telescopic cylinder 4, so that the upper roller frame 3 and the lower roller frame 2 can be suitable for slabs 100 with different thicknesses. The telescopic cylinder 4 can be a hydraulic cylinder or an electric cylinder, and a hydraulic cylinder is adopted in the embodiment of the application.

[0048] Referring to Figure 1 and Figure 3 , the cooling assembly 5 comprises telescopic pipes 51, nozzles 52 and lateral spray pipes 53. The telescopic pipe 51 comprises a plurality of unit pipes 511, the unit pipes 511 are sequentially and slidingly inserted in a head-to-tail manner, the unit pipe 511 in the middle has the largest diameter, the unit pipes 511 on both sides have diameters gradually decreasing away from the middle, guide rods are fixedly connected to the unit pipes 511 at both ends, the guide rods are slidingly connected with the upper roller frame 3, so that the telescopic pipe 51 can slidingly extend and retract on the upper roller frame 3. The nozzles 52 are arranged on each unit pipe 511, the unit pipe 511 in the middle is provided with a water inlet 512, the water entering the water inlet 512 will flow into each unit pipe 511 and be sprayed from the nozzles 52, thereby forming a spraying range to cool the slab 100. The telescopic pipe 51 extends and retracts, the nozzles 52 will change positions, and the spraying range width will change, thereby being suitable for slabs 100 with different widths. There is one telescopic pipe 51 between the adjacent guide rollers on the upper roller frame 3, and the water inlets 512 of the unit pipes 511 in the middle of all the telescopic pipes 51 are connected.

[0049] Referring to Figure 1 and Figure 4The lateral spray pipes 53 are arranged on both sides of the upper roller frame 3, and a plurality of lateral spray pipes 53 are arranged at intervals on each side of the upper roller frame 3. The lateral spray pipes 53 on the same side are jointly connected to a water supply pipe, and the water supply pipe is connected to a water pressure source. The spray heads of the lateral spray pipes 53 are bent towards the slab 100, and are used for spraying and cooling the side surface of the slab 100. The same cooling assembly 5 as that on the upper roller frame 3 is arranged on the lower roller frame 2 symmetrically with respect to the slab 100. When the distance between the upper roller frame 3 and the lower roller frame 2 changes, the spacing of the corresponding lateral spray pipes 53 also changes, so that the spraying width formed by the lateral spray pipes 53 changes.

[0050] With reference to Figures 1-3 The adjusting assembly 6 comprises a trigger rack 61, a trigger gear shaft 62, an adjusting gear 63, an adjusting rack 64, a synchronization gear 65, a synchronization rack 66 and a sliding sleeve 67. The upper roller frame 3 is welded with a guide cylinder 32 on each of the horizontal two sides of the slab 100, and each side is provided with two guide cylinders 32. The trigger rack 61 is slidingly connected in the same side guide cylinder 32, and one end is inclined towards the slab 100 and is arranged at an angle with the moving direction of the slab 100. A tension spring 33 is connected between the end of the trigger rack 61 away from the slab 100 and the guide cylinder 32, and the tension spring 33 pulls the trigger rack 61 towards the slab 100. The end of the trigger rack 61 towards the slab 100 is provided with a roller 611, and the width of the roller 611 is greater than the thickness of the slab 100. When the dummy bar head 11 passes through the roller 611, the transition inclined surface 111 will push the roller 611 to move the trigger rack 61 away from the slab 100, and the tension spring 33 is stretched. When the dummy bar head 11 completely passes through the trigger rack 61, the roller 611 keeps extruding the slab 100, which can reduce the bulging on both sides of the slab 100.

[0051] The trigger gear shaft 62 is rotationally connected between the upper roller frame 3 and the lower roller frame 2 and is engaged with the trigger rack 61. The top end of the trigger gear shaft 62 is rotationally connected with the upper roller frame 3, the bottom end is provided with a spline and slidingly connected with the sliding sleeve 67, so that the sliding sleeve 67 can slide along the trigger gear shaft 62 and also can rotate with the trigger gear shaft 62. The sliding sleeve 67 is rotationally connected with the lower roller frame. The adjusting gears 63 are rotationally connected with the upper roller frame 3 and the lower roller frame 2, and the adjusting gears 63 are symmetrically arranged on the upper roller frame 3 and the lower roller frame 2 with respect to the slab 100, are spaced apart in the moving direction of the slab 100, and correspond to the positions of the telescopic pipes 51. The adjusting gears 63 on the lower roller frame 2 corresponding to the trigger gear shaft 62 are fixedly connected with the sliding sleeve 67. The adjusting gears 63 are symmetrically arranged on the horizontal two sides of the upper roller frame 3 and the lower roller frame 2 with respect to the slab 100.

[0052] The adjusting rack 64 is arranged on the upper roller frame 3 and the lower roller frame 2, and comprises engaging portions 641 and a scissor-type multi-link 642. The scissor-type multi-link 642 is a telescopic structure and is formed by a plurality of links. Two ends of the scissor-type multi-link 642 are respectively hinged with an engaging portion 641. The engaging portion 641 slides out of the upper roller frame 3 or the lower roller frame 2, and one end of the engaging portion 641 that slides out is provided with a tooth and is engaged with the adjusting gear 63. Corresponding to the scissor-type multi-link 642, each unit pipe 511 of the telescopic pipe 51 is hinged with the scissor-type multi-link 642. When the two engaging portions 641 are close to each other, the scissor-type multi-link 642 is contracted, the telescopic pipe 51 is also contracted, and then the nozzles 52 on the telescopic pipe 51 are gathered to narrow the spraying range. When the two engaging portions 641 are away from each other, the scissor-type multi-link 642 is elongated, the telescopic pipe 51 is elongated, and the nozzles 52 on the telescopic pipe 51 are dispersed to widen the spraying range.

[0053] The synchronous gear 65 is coaxially fixedly connected with the adjusting gear 63 in position correspondence. The upper roller frame 3 and the lower roller frame 2 are respectively provided with rectangular tubes on the horizontal two sides. The synchronous rack 66 slides in the rectangular tubes and is engaged with all the synchronous gears 65 in position correspondence on the same side and at the same height.

[0054] The principle of the embodiment of the present application is as follows: when the dummy bar 1 pulls the slab 100 to pass through the guide roller, the transition slope 111 pushes the two rollers 611 to move the trigger rack 61, the trigger rack 61 drives the trigger gear shaft 62 to rotate, and the synchronous gear 65 and the adjusting gear 63 are synchronously rotated. The synchronous gear 65 drives the synchronous rack 66 to move, and the synchronous rack 66 drives all the other adjusting gears 63 to rotate. The rotation of the adjusting gear 63 will lengthen the adjusting rack 64, and the corresponding telescopic pipe 51 will also be lengthened, the position distance of each nozzle 52 is increased, and the spraying range is widened. After the dummy bar 1 passes through the rollers 611, the rollers 611 are in contact with the side walls of the slab 100 to maintain the position state, and the spraying assembly can maintain the width of the spraying range to spray and cool the slab 100. The telescopic pipe 51 can be self-adaptively adjusted according to slabs 100 of different widths, and the application range of the casting device is increased.

[0055] The embodiments of the specific embodiment are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same parts are indicated by the same reference numerals. Therefore, equivalent changes made according to the structure, shape and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A casting apparatus characterized by comprising: The device comprises an ingot guide rod (1) and a guide roller, the ingot guide rod (1) comprises an ingot head (11) and a rod body (12) connected with the ingot head (11), the cross section of the end of the ingot head (11) connected with the rod body (12) gradually decreases along the moving direction of the slab (100), and transition inclined surfaces (111) are arranged on the horizontal two sides; the guide roller comprises: a lower roller frame (2) provided with a mounting seat (21) at the bottom end, the mounting seat (21) being arranged along the extension direction of the continuous casting production line; an upper roller frame (3) arranged on the side of the lower roller frame (2) away from the mounting seat (21) and provided with a guide column (31) between the lower roller frame (2); a telescopic cylinder (4) connected between the lower roller frame (2) and the upper roller frame (3); a cooling assembly (5) comprising a telescopic pipe (51) slidingly connected to the upper roller frame (3) and a nozzle (52) connected to the telescopic pipe (51); an adjusting assembly (6) comprising a trigger rack (61) slidingly connected to the upper roller frame (3), a trigger gear shaft (62) rotationally connected to the upper roller frame (3), an adjusting gear (63) coaxially connected with the trigger gear shaft (62), and an adjusting rack (64) slidingly connected to the upper roller frame (3), the trigger rack (61) being engaged with the trigger gear shaft (62), and the adjusting gear (63) being engaged with the adjusting rack (64); the adjusting rack (64) is connected with the telescopic pipe (51) for pulling the telescopic pipe (51) to extend or retract; a group of the adjusting assembly (6) is arranged on each side of the upper roller frame (3), when the ingot head (11) passes through the trigger rack (61), the transition inclined surface (111) will push the trigger rack (61) away from the upper roller frame (3); the adjusting assembly (6) further comprises a synchronous gear (65) coaxially connected with the adjusting gear (63) and a synchronous rack (66) slidingly connected to the upper roller frame (3), the cooling assembly (5), the adjusting gear (63), the adjusting rack (64) and the synchronous gear (65) are all provided with a plurality of gears along the moving direction of the slab (100), and each synchronous gear (65) on the same side of the upper roller frame (3) is engaged with the synchronous rack (66); the lower roller frame (2) is also provided with the cooling assembly (5), the adjusting gear (63), the adjusting rack (64), the synchronous gear (65) and the synchronous rack (66) symmetrically about the slab (100), and a sliding sleeve (67) is rotationally connected between the adjusting gear (63) coaxial with the trigger gear shaft (62) and the synchronous gear (65) on the lower roller frame (2), and the sliding sleeve (67) is slidingly splined connected with the trigger gear shaft (62); the upper roller frame (3) is provided with a guide cylinder (32) for slidingly connecting the trigger rack (61), and a tension spring (33) is arranged between the guide cylinder (32) and the end of the trigger rack (61) away from the slab (100); the end of the trigger rack (61) towards the slab (100) is provided with a roller (611).

2. A casting apparatus according to claim 1, wherein the telescopic pipe (51) comprises a plurality of unit pipes (511), the adjacent unit pipes (511) are slidingly inserted, and the diameter of each unit pipe (511) gradually decreases along the direction from the middle to the two sides of the telescopic pipe (51).

3. A casting apparatus according to claim 2, wherein The adjusting rack (64) comprises two engaging parts (641) and a shear multi-link (642) hinged between the two engaging parts (641), the engaging parts (641) are slidingly connected to the upper roller frame (3), and the shear multi-link (642) is engaged with each unit pipe (511).

4. The casting apparatus of claim 2, wherein The unit pipe (511) in the middle of the telescopic pipe (51) is provided with a water inlet (512).

5. The casting apparatus of claim 1, wherein The cooling assembly (5) further comprises lateral spray pipes (53) arranged on the upper roller frame (3) and the lower roller frame (2) respectively.

6. The casting apparatus of claim 1, wherein The outer side of the mounting seat (21) is provided with a water collecting plate (22).

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