Device and method for preventing sticking of a slab to a dummy bar during start of casting of a plate casting machine

Abstract

The application discloses a device and method for preventing the sticking of a casting blank and an ingot head during the start of casting of a medium plate casting machine. The support assembly comprises a first partition plate and a support leg fixedly connected to the bottom side of the first partition plate. The adjustment assembly comprises at least two limiting shafts and a plurality of adjustment washers. The limiting shafts are fixed vertically on the first partition plate. The plurality of adjustment washers are sleeved on the limiting shafts in series. The clamping assembly comprises a clamp and a clamp pressing plate. The clamp is installed on the first partition plate through the clamp pressing plate. The second partition plate is provided with positioning holes corresponding to the limiting shafts. The limiting shafts are arranged in the positioning holes. The top end of the adjustment washer is connected to the second partition plate. The ingot head comprises a T-shaped protrusion located at the side wall of the groove of the ingot head. When the ingot head is located at the bottom of the crystallizer, the support leg is supported at the bottom wall of the groove of the ingot head. The clamp clamps the lower part of the T-shaped protrusion. The second partition plate is pressed on the cold charge laid on the top of the ingot head. The second partition plate is directly below the invasive nozzle containing the bottom tapping hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, and particularly relates to a device for preventing the sticking of a slab to a dummy head during the start of casting of a plate casting machine and a method for starting casting. BACKGROUND

[0002] The conventional start-of-casting device and method of the double-side-hole submerged entry nozzle are relatively simple, but the occurrence rate of longitudinal cracks on the surface of the slab is high when producing hypoperitectic steel, which seriously affects the quality of the slab. In view of the high occurrence rate of longitudinal cracks when casting hypoperitectic steel, each refractory manufacturer and expert and scholar has redesigned the hole type of the submerged entry nozzle, such as a five-hole submerged entry nozzle with a bottom tapping hole. Compared with the flow field of the double-side-hole submerged entry nozzle, the flow state of the molten steel near the center of the wide surface of the crystallizer is improved, and the control of the fluctuation of the liquid level of the crystallizer is smaller and more stable, which is very beneficial to the longitudinal crack control of the thick slab.

[0003] However, the five-hole submerged entry nozzle with a bottom tapping hole is subjected to the strong impact of the outflowing molten steel of the bottom tapping hole during the start of casting of the casting machine, so that the laid cold charge is washed away, the slab is stuck to the dummy head, and further, the casting machine fails to separate the dummy, which adversely affects the production stability. SUMMARY

[0004] The present application provides a device for preventing the sticking of a slab to a dummy head during the start of casting of a plate casting machine and a method for starting casting, which solves the technical problem that the slab is stuck to the dummy head due to the washing away of the cold charge by the outflowing molten steel of the bottom hole of the submerged entry nozzle during the start of casting of the submerged entry nozzle with a bottom tapping hole in the prior art, which further causes the failure of the casting machine to separate the dummy and adversely affects the production.

[0005] The present application provides a device for preventing the sticking of a slab to a dummy head during the start of casting of a plate casting machine, which comprises a supporting assembly, an adjusting assembly, a clamping assembly and a second partition plate. The supporting assembly comprises a first partition plate and a supporting leg fixedly connected to the bottom side of the first partition plate. The adjusting assembly comprises at least two limiting shafts and a plurality of adjusting washers. The limiting shafts are fixed on the first partition plate in the vertical direction. The adjusting washers are sleeved on the limiting shafts in series. The clamping assembly comprises a clamp and a clamp pressing plate. The clamp is installed on the first partition plate through the clamp pressing plate. The second partition plate is provided with positioning holes corresponding to the limiting shafts. The limiting shafts are arranged in the positioning holes. The second partition plate is connected to the top ends of the adjusting washers. The dummy head comprises a T-shaped protrusion located at the side wall of the groove of the dummy head. Under the condition that the dummy head is located at the bottom of the crystallizer, the supporting leg is supported at the bottom wall of the groove of the dummy head. The clamp clamps the lower part of the T-shaped protrusion. The second partition plate is pressed on the cold charge laid on the top of the dummy head. The second partition plate is directly below the submerged entry nozzle with a bottom tapping hole.

[0006] In some embodiments, the clamp pressing plate is bolted to the first partition plate, the clamp pressing plate and the first partition plate form a through hole, the clamp is arranged in the through hole, and the relative position of the clamp and the first partition plate is adjusted by adjusting the tightness of the bolt connection between the clamp pressing plate and the first partition plate.

[0007] In some embodiments, the support legs include a first support leg arranged vertically in the middle and a second support leg arranged obliquely on both sides, the first support leg and the second support leg are arranged in sequence along the length direction of the dummy head groove, and the bottom ends of the first support leg and the second support leg are at the same height.

[0008] In some embodiments, the cold material includes a pin scrap cooling material, a cooling steel plate, and a cooling spring, and the pin scrap cooling material, the cooling steel plate, and the cooling spring are sequentially stacked from bottom to top on the dummy head.

[0009] In some embodiments, the support leg is threadedly connected to the first partition plate.

[0010] In some embodiments, the limiting shaft is threadedly connected to the first partition plate.

[0011] In some embodiments, the limiting shaft is provided with a nut, and the nut is installed on the upper side of the second partition plate.

[0012] In some embodiments, the clamp includes a T-shaped rod, two support rods, and a connecting rod, the T-shaped rod includes a horizontal rod and a vertical rod connected to the middle of the horizontal rod, the vertical rod is installed on the first partition plate through the clamp pressing plate, the two support rods are rotatably installed at both ends of the horizontal rod, a surrounding area formed between the two support rods is used to accommodate the lower part of the T-shaped protrusion, the connecting rod is parallel to the horizontal rod, and the connecting rod is threadedly connected to the two support rods.

[0013] A method for starting casting of a medium plate casting machine, applied to production of hypoperitectic steel by a five-hole submerged entry nozzle with a bottom tapping hole in a medium slab casting machine, the method for starting casting of the medium plate casting machine comprising: inserting a dummy bar into a crystallizer, plugging a gap between a dummy head and a copper plate of the crystallizer, and laying cold material; after the laying of the cold material is completed, installing the above-mentioned device for preventing sticking of a cast slab to the dummy head during starting casting of the medium plate casting machine, the device being assembled from bottom to top and arranged in a dummy head groove; and after the device is assembled and arranged, performing a starting casting operation.

[0014] In some embodiments, the device is assembled and arranged from bottom to top, including: fixing the supporting feet to the first partition plate; fixing the limiting shaft to the first partition plate, connecting the clamping assembly with the first partition plate, and leaving a certain space between the clamp pressing plate and the first partition plate to form an intermediate assembly; placing the intermediate assembly into the dummy head groove, adjusting the relative distance between the clamp and the first partition plate, so that the clamp clamps the lower part of the T-shaped protrusion of the dummy head, and then fixing the clamp pressing plate on the first partition plate after clamping; sleeving the adjusting shims outside the limiting shaft, adjusting the size and number of the adjusting shims, so that the highest part of the adjusting shims is flush with the cold material laid on the top of the dummy head, sleeving the second partition plate on the limiting shaft, and pressing the second partition plate on the cold material laid on the top of the dummy head, and fixing and connecting the second partition plate with the limiting shaft by the nut.

[0015] In some embodiments, the opening pouring operation is performed, including: driving the tundish vehicle to the pouring position, and after checking that all equipment and facilities meet the opening pouring conditions, opening the pouring of the ladle by pulling the slide plate nozzle, and when the tonnage of the tundish reaches the required tonnage for opening pouring, opening the nozzle by controlling the stopper, and then pouring in the tundish; automatically starting the caster, including: controlling the injection flow according to the actual situation of the cross-sectional size and the molten steel temperature, and automatically starting the caster when the liquid level reaches 50%.

[0016] In some embodiments, in the opening pouring operation, it further includes: adding opening pouring slag when the liquid level in the crystallizer reaches the middle position of the side hole from the lower edge of the side hole of the nozzle, and adding protective slag when the liquid level reaches the upper edge of the side hole of the nozzle.

[0017] The beneficial effects of the present application are as follows: the device for preventing the bonding of the cast slab and the dummy head during the opening pouring of the plate caster is provided, and when the dummy head is located at the bottom of the crystallizer, the device is installed on the dummy head; the device can block the molten steel flowing out of the bottom tapping hole, avoid the direct contact between the flowing molten steel and the dummy head, and solve the problem of the failure of the dummy head separation caused by the bonding between the cast slab and the dummy head after the opening pouring of the five-hole submerged nozzle containing the bottom tapping hole; the applicability of the device to different height differences of the dummy head can be improved by adjusting the number of the adjusting shims; the device is fixedly connected with the dummy head by the clamp, which greatly improves the impact resistance of the device, prevents the device from being tilted or displaced due to the impact of the molten steel flowing out of the bottom tapping hole during the opening pouring, and improves the plate caster after the application of the device. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application.

[0019] Figure 1 It is a schematic diagram of traditional opening pouring;

[0020] Figure 2 An application diagram of a slab caster opening pouring anti-adhesion device for casting blank and dummy head is provided for the present application;

[0021] Figure 3 A partial structure diagram of a slab caster opening pouring anti-adhesion device for casting blank and dummy head is provided for the present application;

[0022] Figure 4 A whole structure diagram of a slab caster opening pouring anti-adhesion device for casting blank and dummy head is provided for the present application.

[0023] The drawing label: 1- slab caster opening pouring anti-adhesion device for casting blank and dummy head, 101- support assembly, 101.1- support foot, 101.2- first partition, 102- adjustment assembly, 102.1- limiting shaft, 102.2- adjustment gasket, 103- clamping assembly, 103.1- clamp, 103.2- clamp pressing plate, 104- second partition, 2- cold material, 3- dummy head, 4- crystallizer inner wall copper plate, 5- submerged entry nozzle, 501- bottom tapping hole. DETAILED DESCRIPTION

[0024] Please refer to Figure 1 , for the problem of high incidence of longitudinal crack of pouring hypoeutectic steel, in the scheme of five-hole submerged entry nozzle 5 containing bottom tapping hole 501, the bottom tapping hole 501 of five-hole submerged entry nozzle 5 is shown in Figure 1 . Figure 1 Also shown is the dummy head 3, the laid cold material 2 and the crystallizer inner wall copper plate 4.

[0025] Figure 1 As shown in , the dummy head 3 is provided with a groove structure, and a T-shaped protrusion is arranged at the side wall of the groove of the dummy head, the upper part of the T-shaped protrusion is a horizontal rod, and the lower part is a vertical rod structure.

[0026] Figure 2 Please refer to Figure 4 , the present embodiment provides a slab caster opening pouring anti-adhesion device 1 for casting blank and dummy head, which is installed at the groove position of the dummy head 3. Please refer to , the device 1 comprises a support assembly 101, an adjustment assembly 102, a clamping assembly 103 and a second partition 104.

[0027] Among them, please refer to Figure 3 and Figure 4The support assembly 101 comprises a first partition plate 101.2 and a support leg 101.1 fixedly connected to the bottom side of the first partition plate 101.2. The adjusting assembly 102 comprises at least two limiting shafts 102.1 fixed vertically on the first partition plate 101.2 and a plurality of adjusting washers 102.2 sleeved on the limiting shafts 102.1 in series. The clamping assembly 103 comprises a clamp 103.1 and a clamp pressing plate 103.2, the clamp 103.1 being installed on the first partition plate 101.2 through the clamp pressing plate 103.2. The second partition plate 104 is provided with positioning holes corresponding to the limiting shafts 102.1, and the limiting shafts 102.1 are arranged in the positioning holes. The second partition plate 104 is in contact with the top ends of the adjusting washers 102.2.

[0028] Under the condition that the dummy head 3 is located at the bottom of the crystallizer, the support leg 101.1 is supported at the groove bottom wall of the dummy head 3, the clamp 103.1 clamps the lower part of the T-shaped protrusion, and the second partition plate 104 is pressed on the cold charge 2 laid on the top of the dummy head 3. The second partition plate 104 is directly below the submerged entry nozzle containing the bottom tundish nozzle 501.

[0029] In the device, the number of adjusting washers 102.2 can be adjusted to improve the applicability of the device to different height differences of the dummy head 3. In the device, the device is fixedly connected with the dummy head 3 through the clamp 103.1, which greatly improves the impact resistance and prevents the device from being tilted or displaced by the molten steel flowing out of the bottom tundish nozzle during the start-up process.

[0030] Through the device, the molten steel flowing out of the bottom tundish nozzle 501 can be blocked, and direct contact between the molten steel and the dummy head 3 is avoided, thereby solving the problem of sticking between the billet and the dummy head 3 caused by the five-hole submerged entry nozzle containing the bottom tundish nozzle 501 during the start-up of the five-hole submerged entry nozzle. After the application of the device, the occurrence rate of slab longitudinal cracking and the control of liquid level fluctuation are significantly improved after the application of the five-hole submerged entry nozzle containing the lower hole tundish nozzle in the plate caster.

[0031] In some embodiments, please refer to Figures 2 to 4 The support leg 101.1 comprises a vertically arranged first support leg 101.1 located in the middle and two obliquely arranged second support legs 101.1 located on both sides. The first support leg 101.1 and the second support leg 101.1 are arranged in sequence along the length direction of the dummy head groove, and the bottom ends of the first support leg 101.1 and the second support leg 101.1 are at the same height.

[0032] In the support leg 101.1, the two second support legs 101.1 on both sides are symmetrical and have a certain inclination angle, which can improve the stability of the device when it is impacted by the molten steel flowing out of the bottom tundish nozzle 501, prevent the device from tilting, and ensure the effect of blocking the molten steel to protect the cold charge 2.

[0033] In some embodiments, referring to Figure 3 The clamp pressing plate 103.2 is bolted with the first partition plate 101.2, and the clamp pressing plate 103.2 and the first partition plate 101.2 enclose a through hole, the clamp 103.1 is arranged in the through hole, and the relative position of the clamp 103.1 and the first partition plate 101.2 is adjusted by adjusting the tightness of the bolt connection between the clamp pressing plate 103.2 and the first partition plate 101.2. Thus, the front and back distance of the clamp 103.1 relative to the first partition plate 101.2 can be adjusted, and it is ensured that the clamp 103.1 can tightly clamp the lower part of the T-shaped protrusion of the dummy head 3.

[0034] In some embodiments, referring to Figure 3 The clamp 103.1 includes a T-shaped rod, two supporting rods, and a connecting rod. The T-shaped rod includes a horizontal rod and a vertical rod connected to the middle of the horizontal rod. The vertical rod is installed on the first partition plate 101.2 through the clamp pressing plate 103.2. The two supporting rods are rotatably installed at the two ends of the horizontal rod, respectively. The enclosed area formed between the two supporting rods is used to accommodate the lower part of the T-shaped protrusion. The connecting rod is parallel to the horizontal rod, and the connecting rod is threadedly connected with the two supporting rods.

[0035] If the clamp 103.1 is arranged in the through hole as described above, in the scheme in which the clamp 103.1 includes a T-shaped rod, two supporting rods, and a connecting rod, the vertical rod of the T-shaped rod is arranged in the through hole. The front and back distance of the T-shaped rod, i.e., the clamp 103.1, relative to the first partition plate 101.2 is adjusted by adjusting the tightness of the bolt connection between the clamp pressing plate 103.2 and the first partition plate 101.2.

[0036] In some embodiments, the cold material 2 includes a nail scrap cooling material, a cooling steel plate, and a cooling spring. The nail scrap cooling material, the cooling steel plate, and the cooling spring are sequentially stacked from bottom to top on the dummy head 3.

[0037] In addition, the above-mentioned multiple fixed connections can be replaced by detachable connections for easy on-site assembly and adjustment. For example, the supporting leg 101.1 is threadedly connected with the first partition plate 101.2; and the limiting shaft 102.1 is threadedly connected with the first partition plate 101.2.

[0038] The second partition plate 104 is sleeved on the limiting shaft 102.1 and the upper end of the adjusting washer 102.2 through the positioning hole. In some embodiments, the limiting shaft 102.1 is installed with a nut, the nut is installed on the upper side of the second partition plate 104, and the nut is threadedly connected with the limiting shaft 102.1 to limit the second partition plate 104, thereby realizing the fixed connection of the second partition plate 104 and the limiting shaft 102.1 as a whole.

[0039] In view of the problem of high longitudinal crack occurrence rate of casting hypoeutectoid steel, the scheme of using five-hole submerged entry nozzle 5 with bottom taphole 501 is adopted, and a method for starting casting of a medium-thickness slab caster is disclosed.

[0040] Taking the production of hypoeutectoid steel (carbon content of 0.08-0.14%) by a 200mm thick slab caster using five-hole submerged entry nozzle 5 with bottom taphole 501 as an example, the overheat control of the tundish during starting casting is 25-40℃, and the specific starting casting method comprises the following steps:

[0041] (1) Insert the dummy bar into the crystallizer position, with the dummy bar head being 500mm away from the top of the copper plate, and clean the dummy bar head 3 with compressed air to remove dirt and moisture thereon.

[0042] (2) Adjust the distance between the dummy bar head 3 and the wide and narrow copper plates of the crystallizer to ensure that the dummy bar head 3 is located at the center of the wide copper plate.

[0043] (3) Block the gap between the dummy bar head 3 and the copper plate of the crystallizer with a paper rope to prepare for laying the cold material 2, which comprises nail scrap cooling material, cooling steel plate and cooling spring.

[0044] (4) Lay the nail scrap cooling material, which is required to have a thickness of 20-30mm and be uniformly distributed.

[0045] (5) Seal the corner joint of the crystallizer copper plate from the dummy bar head 3 to the bottom of the crystallizer with refractory mortar.

[0046] (6) Lay a layer of cooling steel plate on the nail scrap along the periphery of the crystallizer copper plate.

[0047] (7) Lay the cooling spring on the uppermost layer inside the crystallizer (one layer in the middle and two layers on the east and west sides).

[0048] (8) After the cold material 2 is laid, install a medium-thickness slab caster starting casting anti-sticking device 1 for the cast slab and the dummy bar head, and assemble and arrange the device from bottom to top.

[0049] (9) Assemble the support assembly 101, and fix the support feet 101.1 to the first partition plate 101.2 by screwing, wherein the two support feet 101.1 on the sides are symmetrical and have a certain inclination angle and are horizontally equal.

[0050] (10) Assemble the adjusting assembly 102 and the clamping assembly 103, fix the limiting shaft 102.1 to the first partition plate 101.2 by screwing, connect the clamping assembly 103 with the first partition plate 101.2, and do not completely press the clamp pressing plate 103.2, leaving a certain amount of activity, so that the clamp 103.1 can freely adjust the distance relative to the front and back of the first partition plate 101.2.

[0051] (11) Put the assembled structure into the dummy head groove, support the foot 101.1 side close to the crystallizer inner wall copper plate 4, adjust the relative distance of the clamp 103.1 to make it fit with the dummy head 3, fix the clamp pressing plate 103.2, and improve the stability of the impact of molten steel.

[0052] (12) Install the second partition plate 104, wrap the adjusting gasket 102.2 on the limiting shaft 102.1, adjust the size and number of the adjusting gasket 102.2, make the height of the adjusting gasket 102.2 flush with the cold charge 2 on the top of the dummy head 3, wrap the second partition plate 104 on the limiting shaft 102.1, and press the second partition plate 104 on the cold charge 2 on the top of the dummy head 3, and fix the second partition plate 104 and the limiting shaft 102.1 with nuts.

[0053] (13) Apply lubricating oil on the crystallizer copper plate.

[0054] (14) After the dummy bar is inserted, the area around the crystallizer liquid level control sensor must be cleaned and covered with asbestos cloth.

[0055] (15) Open pouring operation. The tundish car is opened to the pouring position, and after checking that all equipment and facilities meet the opening pouring conditions, the ladle is opened to open the pouring nozzle, and when the tundish tonnage reaches the opening pouring tonnage (25 tons), the stopper is controlled to open, the tundish is opened, and when the liquid level in the crystallizer reaches the lower side hole of the nozzle to the middle position of the side hole, the opening pouring slag is added, and when the liquid level reaches the upper side hole of the nozzle, the protective slag is added. According to the actual situation of the cross section size and the molten steel temperature, the injection flow is controlled, the liquid level reaches 132mm in 90±15s, and then about 3 seconds later, the liquid level height reaches 50% (100mm from the top of the copper plate), and the caster is automatically started. The casting speed is increased to 0.4m / min at an acceleration of 2.4m / min 2 for 10s, and then increased to 0.6m / min at an acceleration of 0.3m / min 2 after maintaining for 60s. After that, the speed control is handed over to manual, and the actual situation is controlled according to 40-50s increase of 0.04m / min by the post operator, and the target speed is increased manually.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present application.

[0057] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A device for preventing sticking of a cast slab to a dummy head at the start of casting in a medium plate caster, characterized by The device comprises: a support assembly comprising a first partition plate and a support leg fixedly connected to the bottom side of the first partition plate; an adjusting assembly comprising at least two limiting shafts fixed vertically on the first partition plate and a plurality of adjusting washers sleeved on the limiting shafts in series; a clamping assembly comprising a clamp and a clamp pressing plate, the clamp being installed on the first partition plate through the clamp pressing plate; a second partition plate provided with positioning holes corresponding to the limiting shafts, the limiting shafts being arranged in the positioning holes, and the second partition plate being connected to the top ends of the adjusting washers; wherein the dummy head comprises a T-shaped protrusion at the side wall of the groove of the dummy head, under the condition that the dummy head is located at the bottom of the crystallizer, the support leg is supported at the bottom wall of the groove of the dummy head, the clamp clamps the lower part of the T-shaped protrusion, the second partition plate is pressed on the cold charge laid on the top of the dummy head, and the second partition plate is located directly below the submerged nozzle with the bottom tapping hole.

2. The apparatus of claim 1, wherein, The clamp pressing plate is bolted to the first partition plate, the clamp pressing plate and the first partition plate form a through hole, the clamp is arranged in the through hole, and the relative position of the clamp and the first partition plate is adjusted by adjusting the tightness of the bolt connection between the clamp pressing plate and the first partition plate.

3. The apparatus of claim 1, wherein, The support leg comprises a vertically arranged first support leg in the middle and two obliquely arranged second support legs on both sides, the first support leg and the second support leg are arranged along the length direction of the groove of the dummy head in sequence, and the bottom ends of the first support leg and the second support leg are at the same height.

4. The apparatus of claim 1, wherein, The cold charge comprises nail scrap cooling material, cooling steel plate and cooling spring, and the nail scrap cooling material, the cooling steel plate and the cooling spring are sequentially stacked from bottom to top on the dummy head.

5. The apparatus of claim 1, wherein, The support leg is threadedly connected to the first partition plate, and the limiting shaft is threadedly connected to the first partition plate.

6. The apparatus of claim 1, wherein, The limiting shaft is provided with a nut, and the nut is arranged on the upper side of the second partition plate.

7. A method of starting casting for a slab caster, which is applied to a slab caster using a five-hole submerged entry nozzle including a bottom tundish nozzle for producing a hypoperitectic steel, characterized in that, The plate casting machine casting method comprises: inserting the dummy bar into the crystallizer, plugging the gap between the dummy head and the copper plate of the crystallizer, and laying the cold charge; after the cold charge is laid, the plate casting machine casting anti-sticking device is installed, the device is assembled and arranged in the groove of the dummy head from bottom to top, and the device is any one of claims 1-6; after the device is assembled and arranged, the casting operation is performed, and then the casting machine is automatically started.

8. The method of starting a continuous casting process of a slab as claimed in claim 7, wherein, The device is assembled and arranged from bottom to top, comprising: fixing the support leg to the first partition plate; fixing the limiting shaft to the first partition plate, connecting the clamping assembly to the first partition plate, and leaving a certain amount of space between the clamp pressing plate and the first partition plate to form an assembly intermediate body; putting the assembly intermediate body into the groove of the dummy head, adjusting the relative distance between the clamp and the first partition plate, clamping the lower part of the T-shaped protrusion of the dummy head with the clamp, and then tightly fixing the clamp pressing plate on the first partition plate. The adjusting gasket is sleeved outside the limiting shaft, the specification number of the adjusting gasket is adjusted, the highest part of the adjusting gasket is flush with the cold material laid on the top of the dummy head, the second partition plate is sleeved on the limiting shaft, and the second partition plate is pressed on the cold material laid on the top of the dummy head; and the second partition plate is fixedly connected with the limiting shaft through a nut.

9. The method of starting a continuous casting process of a slab as claimed in claim 7, wherein, The opening operation includes: driving the tundish vehicle to the pouring position, checking whether each equipment and facility meets the opening condition, opening the tundish by pulling the slide plate and the nozzle, and opening the tundish when the tonnage of the tundish reaches the required tonnage. The automatic starting of the casting machine includes: controlling the injection flow according to the actual situation of the section size and the molten steel temperature, and automatically starting the casting machine when the liquid level height reaches 50%.

10. The method of starting a continuous casting process of a slab as claimed in claim 9, wherein, In the opening operation, the following steps are further included: When the liquid level in the crystallizer reaches the lower edge of the side hole of the nozzle to the middle position of the side hole, the opening slag is added, and when the liquid level reaches the upper edge of the side hole of the nozzle, the protective slag is added.

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